Air handling unit for cleaning workshop

Abstract

According to the sequence that outdoor air flow passes through the air conditioning box, the air conditioning box sequentially comprises a primary efficiency filtering section, a preheating section, a high-pressure micro-fog humidifying section, an empty section, a heating section, a re-cooling section, an air feeder section, a flow equalizing section and a medium efficiency filtering section. Wherein the high-pressure micro-mist humidifying section comprises a plurality of triangular supports arranged in the vertical direction, a plurality of rows of spraying pipes, a plurality of spraying heads, a water receiving disc and a water baffle, each triangular support in the triangular supports arranged in the vertical direction is used for supporting the spraying pipe at the corresponding position, and the spraying heads are arranged on the surfaces of the spraying pipes; the spray pipe is connected with a humidifier outdoor unit matched with the air conditioning cabinet through a hose; the water pan is arranged below the high-pressure micro-fog humidifying section; the water baffle is arranged in the airflow direction. The air conditioning box can be suitable for the air heat and humidity treatment process of a clean workshop in a mild and humid climate area in winter by adjusting the sequence form of the functional modules of the combined air conditioning box.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation engineering, in particular to an air-conditioning box for a clean workshop. Background Art

[0002] The use of combined air-conditioning boxes with high-efficiency air supply is a common form of air-conditioning system in clean workshops. The combined air-conditioning boxes can be modularly integrated according to industry-specific needs, and can perform different air treatment processes such as mixing, filtering, cooling, heating, humidification, and dehumidification to control the temperature and humidity inside the workshop to meet design requirements. Specifically, the design sequence of the functional sections of the combined air-conditioning boxes in the project is not much different, and the internal structure of each functional section is deepened according to the actual load requirements. Generally, the temperature and humidity of outdoor fresh air are low in winter. In order to achieve the set temperature and humidity targets for clean workshops, the combined air-conditioning boxes used in clean workshops often follow the design context of fresh air filtration, preheating, air mixing, heating, and humidification, and adjust the box operation strategy according to the changes in the indoor and outdoor environments during different operating periods.

[0003] Conventional designs overlook the crucial impact of the order of the cabinet's functional sections on the temperature and humidity control effectiveness of the cleanroom combined air conditioning system. Taking the mild and humid winter climate as an example, combined air conditioning cabinets generally adopt a combination of preheating the fresh air, mixing the fresh air with the indoor return air, and then heating and humidifying the mixed air to reach the required delivery state point. Based on actual winter operation, this modular design sequence is not applicable to all climate zones in my country. Furthermore, if the structural sequence design is not optimal and the actual indoor temperature and humidity deviate from the set parameter targets, neither the air conditioning cabinet's own control and adjustment nor human intervention can meet the environmental requirements for cleanroom use.

[0004] Therefore, it is urgent to study an innovative air-conditioning box sequence design form that preheats the fresh air before humidification to ensure the humidification effect of clean workshops in winter. Utility Model Content

[0005] This specification provides an air-conditioning box for a clean workshop, which is used to overcome at least one technical problem existing in the related art.

[0006] According to an embodiment of the present invention, an air conditioning box for a clean room is provided. In the order in which the outdoor air flows through the air conditioning box, the air conditioning box includes a primary filter section, a preheating section, a high-pressure mist humidification section, an air section, a heating section, a re-cooling section, a blower section, a flow equalization section, and a medium-efficiency filter section.

[0007] The primary filter section includes a first frame, a plurality of plate filters are fixedly arranged in the frame structure of the first frame, and the primary filter section is also fixedly provided with a first differential pressure gauge for monitoring the pressure difference between the front and rear ends of the primary filter section;

[0008] The preheating section, the heating section, and the re-cooling section all include a coil heat exchanger and a plurality of supports, wherein the supports are used to support the coil heat exchanger, one end of the coil heat exchanger is a cold / hot medium inlet pipeline, and the other end of the coil heat exchanger is a cold / hot medium outlet pipeline, wherein a valve, a first pressure gauge, and a first thermometer are provided on the cold / hot medium outlet pipeline, and a second pressure gauge and a second thermometer are provided on the cold / hot medium inlet pipeline;

[0009] The air section includes an indoor return air inlet, and the indoor return air inlet is provided with an air valve, and the air valve is located on the top of the box body of the air conditioning box;

[0010] The blower section includes a centrifugal fan, a variable frequency motor, a belt transmission device, and a shock-absorbing base. The variable frequency motor is used to control the speed of the centrifugal fan; the belt transmission device is used to control the centrifugal fan to achieve mechanical transmission; and the shock-absorbing base is used to buffer the vibration of the blower section.

[0011] The flow balancing section includes a preset number of guide plates, which are used to reduce the flow rate of the air flow delivered by the blower section so that the air flow enters the medium-efficiency filter section evenly;

[0012] The medium-efficiency filtration section includes a second frame, a bag filter and a second differential pressure gauge. The second frame is used to support the bag filter. The bag filter includes multiple single bag filters arranged along the airflow direction. The second differential pressure gauge is used to monitor the pressure difference before and after the medium-efficiency filtration section.

[0013] Preferably, each of the preset number of guide plates is a panel evenly provided with a number of openings, and the installation angle of the panel is perpendicular to the direction of the airflow delivered by the blower section.

[0014] Preferably, the high-pressure mist humidification section includes a plurality of vertically arranged triangular brackets, a plurality of rows of nozzles, a plurality of nozzles, a water receiving tray and a water baffle, wherein:

[0015] Each of the plurality of vertically arranged triangular supports is used to support the nozzle at a corresponding position, and a plurality of nozzles are arranged on the surface of the nozzle;

[0016] The nozzle is connected to the humidifier external unit of the air conditioning box via a hose;

[0017] The water receiving tray is arranged below the high-pressure micro-mist humidification section;

[0018] The water baffle is arranged along the air flow direction.

[0019] Preferably, the first frame, the second frame and the support body are all made of galvanized steel.

[0020] Preferably, the plate filter uses G4 grade filter material.

[0021] Preferably, the bag filter uses F8 grade chemical fiber filter material.

[0022] Preferably, the centrifugal fan adopts a two-stage energy-efficient double-inlet backward-inclined device.

[0023] Preferably, the triangular bracket and the nozzle are made of stainless steel, the nozzle is made of ceramic, and the hose is made of plastic.

[0024] Preferably, the first differential pressure gauge and the second differential pressure gauge are pointer-type dials.

[0025] Preferably, the coil heat exchanger comprises a plurality of sections of U-shaped copper tubes and fins connected to each other, wherein the fins are made of hydrophilic aluminum.

[0026] The beneficial effects of the embodiments of this specification are as follows: The embodiments of this specification provide an air conditioning box for clean workshops. By adjusting the sequence of the functional modules of the combined air conditioning box, this combined design is suitable for the air heat and humidity treatment process in clean workshops in mild and humid climate zones in winter. By preheating and humidifying the outdoor fresh air, this air conditioning box form can increase the actual saturated moisture content, expand the range of moisture content that the air can accommodate, and ensure the designed humidification capacity in winter. Through the design and coordination of other functional sections, the air conditioning box can process the mixed air to the appropriate air supply state point and then send it into the clean workshop through the high-efficiency air outlet, ensuring the applicability of the functional design of the air conditioning box. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of this specification or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the overall structure of an air-conditioning box for a clean room provided in one embodiment of this specification;

[0029] Figure 2 This is a schematic diagram of the structure of a primary filter section of an air-conditioning box for a clean workshop provided in one embodiment of this specification;

[0030] Figure 3 This is a schematic structural diagram of a high-pressure mist humidification section of an air-conditioning box for a clean room provided in one embodiment of this specification;

[0031] Figure 4 This is a schematic diagram of the structure of a medium-efficiency filter section of an air-conditioning box for a clean workshop provided in one embodiment of this specification:

[0032] Figure 5 This is a structural diagram of a preheating section / heating section / recooling section in an air-conditioning box for a clean workshop provided in one embodiment of this specification.

[0033] Among them, 1 represents the primary filtration section, 2 represents the preheating section, 3 represents the high-pressure micro-mist humidification section, 4 represents the empty section, 5 represents the heating section, 6 represents the re-cooling section, 7 represents the blower section, 8 represents the flow equalization section, 9 represents the medium-efficiency filtration section, 10 represents the first frame, 11 represents the plate filter, 12 represents the first differential pressure gauge, 121 represents the first differential pressure gauge probe, 122 represents the second differential pressure gauge probe, 13 represents the second frame, 14 represents the bag filter, 15 represents the second differential pressure gauge, 151 represents A third differential pressure gauge probe, 152 represents a fourth differential pressure gauge probe, 16 represents a first thermometer, 17 represents a first pressure gauge, 18 represents a valve, 19 represents a cold / hot medium outlet pipeline, 20 represents a cold / hot medium inlet pipeline, 21 represents a second pressure gauge, 22 represents a second thermometer, 23 represents condensed water, 24 represents a support body, 25 represents a fin, 26 represents a copper tube, 27 represents a triangular bracket, 28 represents a nozzle, 29 represents a nozzle, 30 represents a water receiving tray, and 31 represents a water baffle. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the embodiments described are only part of the embodiments of this utility model, not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this utility model.

[0035] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of this specification and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to the process, method, product, or apparatus.

[0036] The embodiment of this specification discloses an air-conditioning box for a clean room, which is described in detail below.

[0037] Figure 1 This is a schematic diagram of the overall structure of an air conditioning box for a clean room provided in one embodiment of this specification. Figure 1As shown, an air-conditioning box for a clean workshop includes a primary filtration section 1, a preheating section 2, a high-pressure micro-mist humidification section 3, an air section 4, a heating section 5, a re-cooling section 6, a blower section 7, a flow equalization section 8 and a medium-efficiency filtration section 9.

[0038] According to the direction of outdoor wind flowing through the system, it passes through the primary filtration section 1, preheating section 2, high-pressure micro-mist humidification section 3, air section 4, heating section 5, re-cooling section 6, blower section 7, flow equalization section 8, and medium-efficiency filtration section 9 in sequence; the various sections of the system are connected in sequence according to the order in which the outdoor wind passes.

[0039] Among them, the primary filter section 1 includes a first frame 10, and a plurality of plate filters 11 are fixedly installed in the frame structure of the first frame 10. The primary filter section 1 is also fixedly provided with a first differential pressure gauge 12 for monitoring the pressure difference between the front and rear ends of the primary filter section 1. The preheating section 2, the heating section 5 and the re-cooling section 6 all include a coil heat exchanger and several supports 24. The supports 24 are used to support the coil heat exchanger. One end of the coil heat exchanger is a cold / hot medium inlet pipe 20, and the other end of the coil heat exchanger is a cold / hot medium outlet pipe 19. A valve 18, a first pressure gauge 17 and a first thermometer 16 are provided on the cold / hot medium outlet pipe 19, and a second pressure gauge 21 and a second thermometer 22 are provided on the cold / hot medium inlet pipe 20; the air section 4 includes an indoor return air inlet, and the indoor return air inlet is provided with an air valve, which is located at the top of the air conditioner box; the blower section 7 includes a centrifugal fan, a variable frequency motor, a belt drive device and a shock-absorbing base. The variable frequency motor is used to control the speed of the centrifugal fan; the belt drive device is used to control the centrifugal fan to achieve mechanical transmission; the shock-absorbing base is used to buffer the vibration of the blower section; the flow-balancing section 8 includes a preset number of flow plates, which are used to reduce the flow rate of the airflow delivered by the blower section 7 so that it can evenly enter the medium-efficiency filter section 9, wherein each flow plate can be a panel evenly provided with a number of openings, and the installation angle of the panel can be perpendicular to the direction of the airflow delivered by the blower section 7. The material of the panel can be made of corrosion-resistant, lightweight and high-strength materials, such as aluminum alloy, galvanized steel plate or stainless steel; the medium-efficiency filter section 9 includes a second frame 13, a bag filter 14 and a second differential pressure gauge 15. The second frame 13 is used to support the bag filter 14. The bag filter 14 includes multiple single bag filters arranged along the airflow direction. The second differential pressure gauge 15 is used to monitor the pressure difference before and after the medium-efficiency filter section 9.

[0040] In an optional embodiment, the preheating section 2, the heating section 5, and the cooling section 6 may adopt similar structures. In an optional embodiment, Figure 5 This is a schematic diagram of the structure of the preheating section 2 / heating section 5 / recooling section 6 in the air conditioning box. Figure 5As shown, the preheating section 2, heating section 5, and recooling section 6 each include a support 24 and a coil heat exchanger. The support 24 supports the coil heat exchanger, which includes copper tubes 26. Copper tubes 26 are connected to the system's cooling / heating medium pipelines, which are equipped with valves 18, pressure gauges, and thermometers. The empty section 4 includes an indoor return air inlet equipped with a damper located at the top of the system housing.

[0041] Blower section 7 includes a centrifugal fan, a variable frequency motor, a belt drive, and a shock-absorbing base. The variable frequency motor controls the centrifugal fan's speed; the belt drive controls the centrifugal fan's mechanical transmission; and the shock-absorbing base cushions vibrations within the blower section. The centrifugal fan can be a Class 2 energy-efficient, double-inlet, backward-inclined unit. The air volume is designed to meet cleanliness level requirements, and fan performance takes into account the resistance of the fan section itself. The variable frequency motor uses a frequency converter to control its output frequency and voltage, enabling precise adjustment of the motor's speed. The belt drive controls the motor's mechanical transmission, providing noise reduction and buffering. The shock-absorbing base provides efficient vibration reduction.

[0042] The flow balancing section 8 includes a preset number of guide plates, which are used to reduce the flow rate of the airflow delivered by the blower section so that it can enter the medium-efficiency filter section evenly. The high-speed airflow delivered by the blower section is evacuated through the guide plates, and the flow rate is reduced and stabilized, so that the air can enter the medium-efficiency filter section evenly, thereby improving the filtration efficiency.

[0043] The medium-efficiency filtration section 9 includes a second frame 13, a bag filter 14, and a second differential pressure gauge 15. The second frame 13 is used to support the bag filter 14, which includes multiple single-bag filters arranged along the airflow direction. The second differential pressure gauge 15 is used to monitor the pressure difference before and after the medium-efficiency filtration section 9. The second frame 13 can be made of galvanized steel, and the bag filter 14 can use F8-grade chemical fiber filter material with a filtration efficiency of 80%. The second differential pressure gauge 15 can be a pointer dial to monitor the pressure difference before and after this filtration section.

[0044] This utility model provides an air conditioning unit for cleanrooms, utilizing a modular design that adjusts the functional modules' sequential format. This modular design is suitable for air heat and humidity treatment in cleanrooms with mild, humid winter climates. By preheating and humidifying outdoor air, this unit increases the actual saturated moisture content, expands the air's moisture content range, and ensures the desired winter humidification capacity. By integrating other functional components, the unit processes mixed air to the appropriate air supply point before delivering it to the cleanroom through a high-efficiency outlet, ensuring the unit's functional design is adaptable.

[0045] Figure 3This is a schematic structural diagram of a high-pressure micro-mist humidification section of an air-conditioning box for a clean workshop provided in an embodiment of this specification. The high-pressure micro-mist humidification section 3 may include a number of vertically arranged triangular brackets 27, a number of rows of nozzles 28, a number of nozzles 29, a water receiving tray 30 and a water baffle 31, wherein each of the vertically arranged triangular brackets 27 is used to support the nozzle 28 at a corresponding position, and a number of nozzles 29 are provided on the surface of the nozzle 28. The nozzle 28 is connected to the humidifier outdoor unit 33 of the air-conditioning box through a hose 32. The water receiving tray 30 is arranged below the high-pressure micro-mist humidification section; the water baffle 31 is arranged along the air flow direction. In an optional embodiment, according to the principle of uniform flow distribution, such as Figure 3 As shown, the high-pressure micro-mist humidification section 3 is set up with an upper, middle and lower three-section structure; ceramic nozzles are evenly arranged on the surface of the nozzle, and softened water from the humidifier external unit is sprayed out at high speed. The softened water is atomized in the air and fully exchanges heat and moisture with the air after passing through the preheating section; a water receiving tray is set below the humidification section; a wet film water baffle is set along the airflow direction.

[0046] In an optional embodiment, the first frame 10, the second frame 13, and the support body 24 can all be made of galvanized steel, the plate filter 11 can use G4 grade filter material with a filtration efficiency of not less than 65%, and the bag filter 14 can use F8 grade chemical fiber filter material with a filtration efficiency of not less than 80%.

[0047] In an optional embodiment, the centrifugal fan adopts a secondary energy-efficient double-inlet backward-inclined device, the air volume design meets the cleanliness level requirements, and the fan performance takes into account the resistance of the fan section itself.

[0048] In an optional embodiment, the triangular bracket is made of stainless steel, the nozzle is made of stainless steel, the nozzle is made of ceramic, and the hose is made of plastic.

[0049] In an optional embodiment, the first differential pressure gauge 12 and the second differential pressure gauge 15 may be pointer-type dials.

[0050] In an optional embodiment, the coil heat exchanger includes several sections of U-shaped copper tubes 26 and fins 25 connected to each other. The fins 25 can be made of hydrophilic aluminum, which can quickly drain condensed water on the surface of the heat exchanger and exchange heat with the air to achieve cooling or heating of the air.

[0051] The following describes the operating principle of an air conditioning unit for cleanrooms, provided by the present invention: In winter, fresh air required for cleanrooms enters the air conditioning unit from the outside and enters the primary filtration section 1. This section utilizes a plate-type filter device to pre-filter the air conditioning and ventilation system, effectively blocking dust particles larger than 5μm in the air, reducing system resistance and protecting the downstream blower, medium-efficiency filter, and high-efficiency filter. For cleanroom environments requiring high fresh air volume, the fresh air, after primary filtration, enters the preheating section 2. Preheating reduces the relative humidity of the air, while increasing the saturated water vapor pressure and saturated moisture content, expanding the range of moisture content that can be accommodated by (unsaturated) air. Furthermore, in mild and humid climates in winter, where the outdoor air temperature is above approximately 0°C, preheating the fresh air also mitigates the problem of low enthalpy at the mixing point between the outdoor fresh air and indoor return air, which would otherwise fail to meet isenthalpic humidification requirements. The preheated fresh air then enters the humidification section 3. The preheating-first, humidification-second sequence ensures effective humidification. This section utilizes a high-pressure micro-mist humidification device, arranged in an upper, middle, and lower three-stage structure based on the principle of even distribution. Utilizing an isenthalpic humidification process, atomized water sprayed from the nozzle at high speeds fully contacts the air. After absorbing heat from the air, the atomized water rapidly vaporizes and diffuses, humidifying and cooling the fresh air. Softened water is used as the water source for the humidification section to reduce scale buildup on the wet-film baffle surface. Within the empty section 4, the treated fresh air mixes with the indoor return air. The larger enclosure in the empty section ensures thorough mixing of the fresh and return air. Considering the temperature and humidity of the mixed air after mixing, the heating section 5 and re-cooling section 6 are designed to regulate the temperature and humidity of the mixed air. The mixed air rises in temperature after passing through the heating section 5, and the relative humidity is maintained at the required level after passing through the re-cooling section 6. The regulated mixed air reaches the indoor supply air conditioner. The blower section, serving as the power source, delivers air into the cleanroom, ensuring a smooth circulation process. The mixed air that reaches the indoor air supply state point flows through the fan section 7 and then enters the flow balancing section 8, which slows down the high-speed airflow sent by the fan and evenly sends it to the medium-efficiency filter section 9. The medium-efficiency filter section 9 uses a bag dust removal device to filter dust particles of 1 to 5 μm. The mixed air after secondary purification is sent to the workshop, and then filtered through the high-efficiency air supply port before being sent into the clean room.

[0052] Those skilled in the art will appreciate that the accompanying drawings are merely schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present invention.

[0053] Those skilled in the art will appreciate that the modules in the apparatuses of the embodiments may be distributed in the apparatuses of the embodiments as described in the embodiments, or may be located in one or more apparatuses different from the embodiments with corresponding changes. The modules in the above embodiments may be combined into one module or further divided into multiple sub-modules.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning box for a clean workshop, characterized in that: According to the order in which the outdoor air flows through the air conditioning box, the air conditioning box comprises a primary filter section (1), a preheating section (2), a high-pressure mist humidification section (3), an air section (4), a heating section (5), a re-cooling section (6), a blower section (7), a flow averaging section (8) and a medium-efficiency filter section (9); The primary filter section (1) comprises a first frame (10), a plurality of plate filters (11) are fixedly arranged in the frame structure of the first frame (10), and the primary filter section (1) is also fixedly provided with a first differential pressure gauge (12) for monitoring the pressure difference between the front and rear ends of the primary filter section (1); The preheating section (2), the heating section (5) and the re-cooling section (6) all include a coil heat exchanger and a plurality of supports (24), wherein the supports (24) are used to support the coil heat exchanger, one end of the coil heat exchanger is a cold / hot medium inlet pipeline (20), and the other end of the coil heat exchanger is a cold / hot medium outlet pipeline (19), wherein the cold / hot medium outlet pipeline (19) is provided with a valve (18), a first pressure gauge (17) and a first thermometer (16), and the cold / hot medium inlet pipeline (20) is provided with a second pressure gauge (21) and a second thermometer (22); The air section (4) includes an indoor return air inlet, and the indoor return air inlet is provided with an air valve, and the air valve is located at the top of the box body of the air conditioning box; The blower section (7) comprises a centrifugal fan, a variable frequency motor, a belt transmission device and a shock-absorbing base, wherein the variable frequency motor is used to control the rotation speed of the centrifugal fan; the belt transmission device is used to control the centrifugal fan to achieve mechanical transmission; and the shock-absorbing base is used to buffer the vibration of the blower section; The flow balancing section (8) includes a preset number of guide plates, and the guide plates are used to reduce the flow rate of the air flow delivered by the blower section (7) so that the air flow evenly enters the medium-efficiency filter section (9); The medium-efficiency filter section (9) comprises a second frame (13), a bag filter (14) and a second differential pressure gauge (15), wherein the second frame is used to support the bag filter (14), the bag filter (14) comprises a plurality of single bag filters arranged along the airflow direction, and the second differential pressure gauge (15) is used to monitor the pressure difference before and after the medium-efficiency filter section (9).

2. The air conditioning box for a clean workshop according to claim 1, characterized in that: Each of the preset number of guide plates is a panel evenly provided with a plurality of openings, and the installation angle of the panel is perpendicular to the direction of the air flow delivered by the blower section (7).

3. The air conditioning box for a clean workshop according to claim 1, characterized in that: The high-pressure micro-mist humidification section (3) comprises a plurality of vertically arranged triangular supports (27), a plurality of rows of nozzles (28), a plurality of nozzles (29), a water receiving tray (30) and a water baffle (31), wherein: Each of the plurality of vertically arranged triangular supports (27) is used to support the nozzle (28) at a corresponding position, and a plurality of nozzles (29) are provided on the surface of the nozzle (28); The nozzle (28) is connected to the humidifier external unit (33) of the air conditioning box via a hose (32); The water receiving tray (30) is arranged below the high-pressure micro-mist humidification section; The water baffle (31) is arranged along the airflow direction.

4. The air conditioning box for a clean workshop according to claim 1, characterized in that: The first frame (10), the second frame (13) and the support body are all made of galvanized steel.

5. The air conditioning box for a clean workshop according to claim 1, characterized in that: The plate filter (11) uses G4 grade filter material.

6. The air conditioning box for a clean workshop according to claim 1, characterized in that: The bag filter (14) uses F8 grade chemical fiber filter material.

7. The air conditioning box for a clean workshop according to claim 1, characterized in that: The centrifugal fan adopts a two-stage energy-efficient double-inlet backward-inclined device.

8. The air conditioning box for a clean workshop according to claim 3, characterized in that: The triangular support (27) and the nozzle (28) are made of stainless steel, the nozzle (29) is made of ceramic, and the hose (32) is made of plastic.

9. The air conditioning box for a clean workshop according to claim 1, characterized in that: The first differential pressure gauge (12) and the second differential pressure gauge (15) are pointer-type dials.

10. The air conditioning box for a clean workshop according to claim 1, characterized in that: The coil heat exchanger comprises a plurality of sections of U-shaped copper tubes (26) and fins (25) connected to each other, wherein the fins (25) are made of hydrophilic aluminum.

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