A new fan unit for positive control laboratories

Abstract

The application discloses a brand-new fan unit for a positive control laboratory, and relates to the technical field of fresh air fan units. The fan unit comprises a case, a self-cleaning filter device, a first electric fan, a second electric fan, a condenser, an evaporator, a sterilization device, a compressor and a filter. The first electric fan drives a two-stage supercharging assembly to rotate reversely, so that air flows into a supercharging chamber. The air is compressed in the supercharging chamber and is guided into the inside of a filter screen through a jet pipe. The high-pressure gas mixed with water mist washes the filter screen from the inside to the outside, so that the dust on the filter screen is cleaned under the impact and washing of the high-pressure gas-liquid mixture. The transmission plate on the two-stage supercharging assembly drives the whole filter screen assembly to rotate on a conical shell. Under the action of centrifugal force, part of the dust is thrown out, and the clean water on the filter screen is centrifugally thrown dry, so that the purposes of filter screen cleaning and centrifugal drying are achieved. The annular filter screen filters the dust in sewage, so that the purposes of filtering and recycling the clean sewage are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new air handling units, in particular to a new air handling unit for a positive control laboratory. BACKGROUND

[0002] A positive control laboratory is a laboratory used for setting up positive controls in scientific experiments and research. A positive control is a sample known to produce expected results, used to verify the feasibility and effectiveness of experimental methods. In a positive control laboratory, experiments are usually conducted using conditions known to produce specific experimental results or phenomena to ensure the correctness of the experimental process and the reliability of the experimental results. As a key place for high-risk experiments such as live bacteria operations, the new air handling unit has strict requirements, and the new air handling unit can remove microorganisms, dust and other pollutants in the air to provide high-quality air for the laboratory. This is crucial for maintaining the stability of experimental materials and the accuracy of experimental results.

[0003] The current new air handling unit will cause the internal airflow to slow down and the air outlet efficiency to decrease after a long time of use due to filter screen blockage. Especially at the new air inlet connected to the external air, when the external environment is poor, the filter screen assembly at the new air inlet will be blocked faster. The traditional solution often uses manual disassembly of the filter screen for cleaning or replacement, which requires users to invite professional staff to maintain, which is extremely inconvenient. SUMMARY

[0004] The purpose of the present application is to provide a new air handling unit for a positive control laboratory to solve the problems in the prior art.

[0005] To achieve the above purpose, the present application provides the following technical solution: a new air handling unit for a positive control laboratory, comprising a cabinet, a condenser and an evaporator installed in the cabinet, a sterilization device and a compressor installed in the cabinet, a self-cleaning filter device installed in the cabinet, a first electric fan and a second electric fan installed in the cabinet, the first electric fan and the self-cleaning filter device being engaged and driven, and a filter installed in the cabinet; the self-cleaning filter device comprises a cleaning shell and a spray washing assembly, the cleaning shell is installed on the cabinet, the filter screen assembly is rotatably installed in the cleaning shell, the secondary booster assembly is rotatably installed on the cleaning shell, the spray washing assembly is installed on the cleaning shell, the spray washing assembly penetrates the filter screen assembly, and the spray washing assembly is rotatably connected with the filter screen assembly.

[0006] The control system is integrated in the cabinet, and the control system is used to control the entire new air handling unit.

[0007] The control system starts the first electric fan and the second electric fan, the first electric fan and the second electric fan rotate in the positive direction, the first electric fan drives external air to flow through the self-cleaning filter device from the fresh air inlet, the air filtered by the self-cleaning filter device enters the fresh air inlet chamber, the air flows to the fresh air outlet chamber through the evaporator, the sterilizer disinfects the air, the treated air flows out from the fresh air outlet, the second electric fan drives indoor air to flow into the return air inlet chamber from the return air inlet, the filter filters the air, the air flows into the return air outlet chamber through the condenser, and then is discharged from the return air outlet, the condenser, the evaporator and the compressor cooperate with each other to intelligently control the temperature of the air, so as to complete the air purification and temperature regulation in the laboratory.

[0008] Further, the cleaning shell and the filter screen assembly form a cleaning chamber, and the filter screen assembly, the secondary supercharging assembly and the cleaning shell form a supercharging chamber.

[0009] Further, the first electric fan is provided with a transmission column at the bottom end, the transmission column is provided with a first inclined surface, the first inclined surface is provided with a first bevel gear, a transmission rod is rotatably installed on the case, one end of the transmission rod is provided with a first bevel gear, the other end of the transmission rod is provided with a second bevel gear, the transmission column is in meshing transmission with the first bevel gear and the first bevel gear, and the second bevel gear is in meshing transmission with the secondary supercharging assembly.

[0010] Further, the cleaning shell comprises a cleaning cylinder, the cleaning cylinder is provided with a conical shell at the bottom end, the conical shell is provided with an exhaust hole, the conical shell is provided with an electromagnetic ring at the top end, the cleaning cylinder is provided with an annular filter screen, the cleaning cylinder is provided with a drain pipe at the bottom end, the conical shell is rotatably provided with a secondary supercharging assembly at the bottom end, and the conical shell is rotatably provided with a filter screen assembly at the top end.

[0011] The discharged sewage and dust fall to the annular filter screen under the action of gravity, the annular filter screen filters the dust in the sewage, the filtered water falls into the bottom of the cleaning cylinder, is discharged from the drain pipe and is recycled, so that the purpose of filtering and recycling the cleaning sewage is achieved.

[0012] Further, the secondary supercharging assembly comprises a supercharging ring, the supercharging ring is rotatably installed at the bottom end of the conical shell, the supercharging ring is provided with a transmission plate, the supercharging ring is provided with a fan blade, the supercharging ring is provided with a second inclined surface, the second inclined surface is provided with a second bevel gear, and the supercharging ring is in meshing transmission with the second bevel gear through the second bevel gear.

[0013] When the air passes through the self-cleaning filter device, the air enters the filter screen from the cleaning chamber, the filter screen filters the air, the dust in the air is blocked by the filter screen, and the filtered air enters the booster chamber. When the first electric fan rotates, the first bevel gear is driven to rotate through the transmission column, the transmission rod is driven to rotate by the first bevel gear, the second bevel gear is driven to rotate by the transmission rod, the earphone booster assembly is driven to rotate by the second bevel gear, the fan blades on the secondary booster assembly rotate, the rotation of the fan blades drives the air filtered by the filter screen to accelerate downward, the airflow in the filter screen accelerates to flow, which reduces the air pressure in the filter screen, and the air outside the filter screen flows into the filter screen under the action of the air pressure difference, thereby improving the filtering efficiency. When the dust attached to the filter screen increases, the dust on the filter screen hinders the air flow, the air flow rate decreases, and the air in the filter screen accelerates to flow under the action of the secondary booster assembly, thereby generating negative pressure inside and outside the filter screen to offset the resistance of the dust.

[0014] Further, the filter screen assembly comprises a filter screen support and a bottom turntable, the filter screen support is provided with a filter screen, the bottom end of the filter screen support is provided with an extension rod, the extension rod penetrates through the bottom turntable and is provided with a supporting piece, the supporting piece and the bottom turntable are provided with an extension spring, the filter screen support and the bottom turntable are provided with a flexible extension tube, the bottom turntable is rotationally installed at the top end of the conical shell, the flexible extension tube is made of a flexible and extendable material, and the bottom turntable, the conical shell and the secondary booster assembly form a booster chamber.

[0015] During the locking process of the filter screen support, the extension rod is driven to descend synchronously, when the self-locking is completed, the extension rod extends into the secondary booster assembly, at this time, the bottom of the extension rod is aligned with the transmission plate, when the first electric fan drives the secondary booster assembly to rotate reversely, the transmission plate on the secondary booster assembly pushes the extension rod to rotate together, the extension rod drives the entire filter screen assembly to rotate on the conical shell, the control system opens the spray washing assembly, the high-pressure water flow is input into the spray rod by the high-pressure water supply device, the high-pressure water flow is sprayed from the spray head to form water mist, when the secondary booster assembly rotates reversely, the air in the fresh air inlet chamber flows upward into the booster chamber, because the first electric valve is closed, the air pressure in the booster chamber rises, the control system opens the second electric valve, the air enters the air jet pipe from the air outlet under the action of the pressure, the air jet pipe guides the high-pressure gas into the filter screen, the high-pressure gas mixed with the water mist washes the filter screen from inside to outside, so that the dust on the filter screen is cleaned under the impact and washing of the high-pressure gas-liquid mixture, at the same time, the filter screen in the rotating state is centrifuged under the action of the centrifugal force, so that part of the dust attached to the filter screen is thrown out, and the cleaning water on the filter screen is centrifuged to be dry, thereby achieving the purposes of filter screen cleaning and centrifugal drying.

[0016] Further, the bottom end of the filter screen support is provided with a fixing hook, the bottom turntable is provided with a locking groove and a sliding hole, the bottom end of the bottom turntable is provided with a first electric valve, the locking groove is slidably provided with a locking mechanism, the extension rod is slidably connected with the bottom turntable through the sliding hole, and the fixing hook corresponds to the locking mechanism in position.

[0017] The bottom turntable is provided with a monitoring element, which sends an electrical signal to the control system when the fixing hook is embedded with the locking device.

[0018] When the filter screen is blocked in a large area, the air pressure outside the filter screen assembly is greater than the air pressure inside, and under the action of the pressure difference, the filter screen assembly is pressed and drives the rotating ring to slide downward along the spray rod, the filter screen support drives the fixing hook to descend, and the fixing hook descends to the height of the locking block to extrude the locking block, and the locking block retracts in the direction of the locking rod after being pressed, and when the fixing hook descends and slides through the locking block, the locking block rebounds under the elastic force of the self-locking spring, and the locking block abuts against the clamping groove on the fixing hook to prevent the fixing hook from rebounding, thereby realizing automatic locking of the filter screen assembly. After the control system judges that the filter screen assembly is locked, the entire fresh air unit is closed, then the first electric fan is opened in reverse, and the first electric valve at the bottom of the bottom turntable is closed.

[0019] When the filter screen is dried, the control system energizes the electromagnetic ring, the electromagnetic ring generates a magnetic force after being energized to attract the suction block, the suction block drives the locking block to retract through the locking rod, so that the locking block is separated from the fixing hook, and after the fixing hook loses the constraint, the filter screen support drives the filter screen to rebound and reset under the action of the spring, then the control system drives other components to reset, thereby realizing self-cleaning of the filter screen assembly.

[0020] Further, the locking mechanism includes a locking rod, the locking rod is slidingly installed on the bottom turntable, one end of the locking rod is provided with a suction block, the other end of the locking rod is provided with a locking block, a self-locking spring is installed between the locking block and the bottom turntable, and the suction block and the electromagnetic ring are located in the same plane.

[0021] Further, the spray washing assembly includes a spray rod, an air jet pipe, a rotating ring, and a connecting plate, the connecting plate is installed on the machine box, the connecting plate is provided with a high-pressure water supply device, the spray rod is installed at the bottom end of the high-pressure water supply device, the spray rod is in communication with the inside of the high-pressure water supply device, a plurality of spray heads are installed on the spray rod, the rotating ring is provided with a first hole and a second hole, one end of the air jet pipe is connected with the first hole, the other end of the air jet pipe is in communication with the pressure chamber through an exhaust hole, the end of the air jet pipe connected with the exhaust hole is provided with a second electric valve, the spray rod is movably connected with the rotating ring through the second hole, and the rotating ring is rotatably installed at the top end of the filter screen support.

[0022] The high-pressure water supply device is used to provide high-pressure water flow to the spray rod.

[0023] Further, the cabinet top end is respectively provided with a fresh air inlet, a fresh air outlet, a return air inlet and a return air outlet, the cabinet is respectively provided with a fresh air inlet cabin, a fresh air outlet cabin, a return air inlet cabin and a return air outlet cabin, the self-cleaning filter device is located at the top end of the fresh air inlet cabin, the first electric fan and the sterilizer are located in the fresh air outlet cabin, the filter and the compressor are located in the return air inlet cabin, the second electric fan is located in the return air outlet cabin, the evaporator is arranged between the fresh air inlet cabin and the fresh air outlet cabin, and the condenser is arranged between the return air inlet cabin and the return air outlet cabin.

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] 1. The first electric fan drives the secondary supercharging assembly to rotate, the fan blades on the secondary supercharging assembly rotate to drive the air to accelerate downward, so that the air pressure inside the filter screen decreases, and the air outside the filter screen flows into the inside of the filter screen under the action of the air pressure difference, thereby improving the air filtration efficiency. When the dust attached to the filter screen increases, the dust on the filter screen hinders the air flow, and the air flow rate decreases. Under the action of the secondary supercharging assembly, the negative pressure generated inside and outside the filter screen offsets the resistance of the dust, effectively preventing the reduction of air filtration efficiency.

[0026] 2. The pressure difference generated when the filter screen is blocked causes the filter screen support to automatically drive the fixing hook to descend, the fixing hook extrudes the locking block, the locking block retracts along the locking rod direction after being pressed, and when the fixing hook descends and slides through the locking block, the locking block rebounds under the action of the self-locking spring, the locking block abuts against the clamping groove on the fixing hook to prevent the fixing hook from rebounding, thereby realizing automatic locking of the filter screen assembly. Then, the electromagnetic ring is energized to attract the adsorption block, so that the locking block is separated from the fixing hook, the filter screen support drives the filter screen to rebound and reset, and the contact locking function is realized.

[0027] 3. The first electric fan drives the secondary supercharging assembly to rotate in reverse, so that the air flows into the supercharging chamber, the air is compressed in the supercharging chamber and introduced into the inside of the filter screen through the jet pipe, and the high-pressure gas mixed with water mist washes the filter screen from inside to outside, so that the dust on the filter screen is cleaned under the impact and washing of the high-pressure gas-liquid mixture. The transmission plate on the secondary supercharging assembly drives the entire filter screen assembly to rotate on the conical shell, and the filter screen in the rotating state is centrifuged under the action of the centrifugal force, so that part of the dust attached to the filter screen is thrown out, and the cleaning water on the filter screen is centrifuged and dried, thereby realizing the purposes of filter screen cleaning and centrifugal drying.

[0028] 4. The dust in the sewage is filtered by the annular filter screen, the filtered water falls into the bottom of the cleaning cylinder and is discharged for collection, thereby realizing the purposes of filtering and recycling the cleaning sewage. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1The overall perspective view of the new air handling unit of the present application;

[0030] Figure 2 The perspective view of the new air handling unit of the present application;

[0031] Figure 3 The perspective view of the self-cleaning filter device and the first electric fan of the present application;

[0032] Figure 4 The perspective view of the cleaning shell of the present application;

[0033] Figure 5 The perspective view of the spray washing assembly of the present application;

[0034] Figure 6 The perspective view of the filter screen assembly and the secondary pressure boosting assembly of the present application;

[0035] Figure 7 The perspective view of the bottom turntable of the present application;

[0036] Figure 8 The Figure 7 The local enlarged view of the A area in the figure.

[0037] In the figure: 1, the case; 2, the self-cleaning filter device; 3, the first electric fan; 4, the second electric fan; 5, the condenser; 6, the evaporator; 7, the sterilization device; 8, the compressor; 9, the filter; 11, the fresh air inlet; 12, the fresh air outlet; 13, the return air inlet; 14, the return air outlet; 15, the fresh air intake cabin; 16, the fresh air outlet cabin; 17, the return air intake cabin; 18, the return air outlet cabin; 21, the cleaning shell; 22, the spray washing assembly; 23, the filter screen assembly; 24, the secondary pressure boosting assembly; 25, the pressure boosting chamber; 26, the cleaning chamber; 31, the transmission column; 32, the transmission rod; 33, the first bevel gear; 34, the first inclined surface; 35, the second bevel gear; 211, the annular filter screen; 212, the drain pipe; 213, the cleaning cylinder; 214, the exhaust hole; 215, the electromagnetic ring; 216, the conical shell; 221, the high-pressure water supply device; 222, the connecting plate; 223, the air jet pipe; 224, the spray rod; 225, the spray head; 226, the rotating ring; 2261, the first hole; 2262, the second hole; 231, the filter screen support; 232, the filter screen sheet; 233, the flexible telescopic pipe; 234, the telescopic rod; 235, the locking mechanism; 236, the bottom turntable; 237, the telescopic spring; 238, the supporting sheet; 239, the fixing hook; 241, the fan blade; 242, the transmission plate; 243, the second inclined surface; 244, the pressure boosting ring; 2361, the sliding hole; 2362, the locking groove; 2351, the locking block; 2352, the adsorption block; 2353, the locking rod; 2354, the self-locking spring. DETAILED DESCRIPTION

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] like Figures 1-8 As shown, this invention provides a 100% fresh air handling unit technical solution for a positive control laboratory: It includes a chassis 1, within which a condenser 5 and an evaporator 6 are installed; a sterilizer 7 and a compressor 8 are installed within the chassis 1; a self-cleaning filter device 2 is installed within the chassis 1; a first electric fan 3 and a second electric fan 4 are installed within the chassis 1; the first electric fan 3 and the self-cleaning filter device 2 are meshed and driven; and a filter 9 is installed within the chassis 1. The self-cleaning filter device 2 includes a cleaning housing 21 and a spray washing assembly 22. The cleaning housing 21 is mounted on the chassis 1, and a filter screen assembly 23 is rotatably mounted within the cleaning housing 21. A secondary pressurization assembly 24 is rotatably mounted on the cleaning housing 21. The spray washing assembly 22 is mounted on the cleaning housing 21, passes through the filter screen assembly 23, and is rotatably connected to the filter screen assembly 23. A control system is integrated within the chassis 1 to control the entire 100% fresh air handling unit.

[0040] The cleaning chamber 26 is formed between the cleaning housing 21 and the filter assembly 23, and the pressurization chamber 25 is formed between the filter assembly 23, the secondary pressurization assembly 24 and the cleaning housing 21.

[0041] A transmission column 31 is installed at the bottom of the first electric fan 3. The transmission column 31 has a first inclined surface 34 and a first bevel tooth. A transmission rod 32 is rotatably installed on the housing 1. A first bevel gear 33 is installed at one end of the transmission rod 32 and a second bevel gear 35 is installed at the other end of the transmission rod 32. The transmission column 31 is driven by meshing with the first bevel gear 33 through the first bevel tooth, and the second bevel gear 35 is driven by meshing with the secondary booster assembly 24.

[0042] The secondary booster assembly 24 includes a booster ring 244, which is rotatably mounted on the bottom end of the conical shell 216. A transmission plate 242 is mounted on the booster ring 244, and fan blades 241 are provided on the booster ring 244. A second inclined surface 243 is provided on the booster ring 244, and a second bevel tooth is provided on the second inclined surface 243. The booster ring 244 is driven by meshing with a second bevel gear 35 through the second bevel tooth.

[0043] The bottom end of the filter screen support 231 is provided with a fixing hook 239, the bottom turntable 236 is provided with a locking groove 2362, the bottom turntable 236 is provided with a sliding hole 2361, the bottom end of the bottom turntable 236 is provided with a first electric valve, the locking groove 2362 is slidably provided with a locking mechanism 235, the telescopic rod 234 is slidably connected with the bottom turntable 236 through the sliding hole 2361, and the fixing hook 239 corresponds to the locking mechanism 235 in position.

[0044] The bottom turntable 236 is provided with a monitoring element, and when the fixing hook 239 is embedded with the locking device, the monitoring element sends an electrical signal to the control system.

[0045] The filter screen assembly 23 comprises the filter screen support 231 and the bottom turntable 236, the filter screen support 231 is provided with the filter screen sheet 232, the bottom end of the filter screen support 231 is provided with the telescopic rod 234, the telescopic rod 234 penetrates through the bottom turntable 236 and is provided with the supporting sheet 238, the telescopic spring 237 is arranged between the supporting sheet 238 and the bottom turntable 236, the flexible telescopic pipe 233 is arranged between the filter screen support 231 and the bottom turntable 236, the bottom turntable 236 is rotatably arranged at the top end of the conical shell 216, the flexible telescopic pipe 233 is made of flexible telescopic material, and the bottom turntable 236, the conical shell 216 and the secondary supercharging assembly 24 form a supercharging chamber 25.

[0046] The cleaning shell 21 comprises the cleaning cylinder 213, the bottom end of the cleaning cylinder 213 is provided with the conical shell 216, the conical shell 216 is provided with the exhaust hole 214, the top end of the conical shell 216 is provided with the electromagnetic ring 215, the cleaning cylinder 213 is provided with the annular filter screen 211, the bottom end of the cleaning cylinder 213 is provided with the drain pipe 212, the bottom end of the conical shell 216 is rotatably provided with the secondary supercharging assembly 24, and the top end of the conical shell 216 is rotatably provided with the filter screen assembly 23.

[0047] The locking mechanism 235 comprises a locking rod 2353, the locking rod 2353 is slidably arranged on the bottom turntable 236, one end of the locking rod 2353 is provided with an adsorption block 2352, the other end of the locking rod 2353 is provided with a locking block 2351, the locking block 2351 and the bottom turntable 236 are provided with a self-locking spring 2354, and the adsorption block 2352 is located in the same plane as the electromagnetic ring 215.

[0048] The spray washing assembly 22 comprises a spray rod 224, an air jet pipe 223, a rotating ring 226 and a connecting plate 222, the connecting plate 222 is installed on the cabinet 1, the connecting plate 222 is provided with a high-pressure water supply device 221, the spray rod 224 is installed at the bottom end of the high-pressure water supply device 221, the spray rod 224 is in communication with the inside of the high-pressure water supply device 221, a plurality of spray heads 225 are installed on the spray rod 224, the rotating ring 226 is respectively provided with a first hole 2261 and a second hole 2262, one end of the air jet pipe 223 is connected with the first hole 2261, the other end of the air jet pipe 223 is communicated with the pressure chamber 25 through an exhaust hole 214, the end of the air jet pipe 223 connected with the exhaust hole 214 is provided with a second electric valve, the spray rod 224 is movably connected with the rotating ring 226 through the second hole 2262, and the rotating ring 226 is rotatably installed at the top end of the filter screen support 231.

[0049] The high-pressure water supply device 221 is used for providing high-pressure water flow into the spray rod 224.

[0050] The cabinet 1 is respectively provided with a fresh air inlet 11, a fresh air outlet 12, a return air inlet 13 and a return air outlet 14, and is respectively provided with a fresh air inlet chamber 15, a fresh air outlet chamber 16, a return air inlet chamber 17 and a return air outlet chamber 18, the self-cleaning filter device 2 is located at the top end of the fresh air inlet chamber 15, the first electric fan 3 and the sterilization device 7 are located in the fresh air outlet chamber 16, the filter 9 and the compressor 8 are located in the return air inlet chamber 17, and the second electric fan 4 is located in the return air outlet chamber 18.

[0051] The working principle of the present application is that the control system starts the first electric fan 3 and the second electric fan 4, the first electric fan 3 and the second electric fan 4 rotate in the forward direction, the first electric fan 3 drives external air to flow through the self-cleaning filter device 2 from the fresh air inlet 11, the air filtered by the self-cleaning filter device 2 enters the fresh air inlet chamber 15, the air flows to the fresh air outlet chamber through the evaporator 6, the sterilization device 7 sterilizes and disinfects the air, the treated air flows out from the fresh air outlet 12, the second electric fan 4 drives indoor air to flow into the return air inlet chamber 17 from the return air inlet 13, the filter 9 filters the air, the air flows into the return air outlet chamber 18 through the condenser 5, and then is discharged from the return air outlet 14, and the condenser 5, the evaporator 6 and the compressor 8 cooperate with each other to intelligently control the temperature of the air, so that the air purification and temperature regulation in the laboratory are completed.

[0052] When the air passes through the self-cleaning filter device 2, the air passes from the cleaning chamber 26 into the filter screen 232, the filter screen 232 filters the air, the dust in the air is blocked by the filter screen 232, and the filtered air enters the booster chamber 25. When the first electric fan 3 rotates, the first bevel gear 33 is driven to rotate through the transmission column 31, the transmission rod 32 is driven to rotate by the first bevel gear 33, the second bevel gear 35 is driven to rotate by the transmission rod 32, the earphone booster assembly is driven to rotate by the second bevel gear 35, the fan blades 241 on the secondary booster assembly 24 rotate, the fan blades 241 rotate to drive the air filtered by the filter screen 232 to accelerate downward, the airflow in the filter screen 232 accelerates to reduce the air pressure in the filter screen 232, and the air outside the filter screen 232 flows into the filter screen 232 under the action of the air pressure difference, thereby improving the filtering efficiency. When the dust attached to the filter screen 232 increases, the dust on the filter screen 232 hinders the air flow, the air flow rate decreases, and under the action of the secondary booster assembly 24, the air in the filter screen 232 accelerates to flow, thereby generating negative pressure inside and outside the filter screen 232 to offset the resistance of the dust.

[0053] When the filter screen 232 is blocked in a large area, the air pressure outside the filter screen assembly 23 is greater than the air pressure inside, and under the action of the pressure difference, the filter screen assembly 23 is pressed and drives the rotating ring 226 to slide downward along the spray rod 224, the filter screen support 231 drives the fixed hook 239 to descend, and the fixed hook 239 descends to the height of the lock block 2351 to extrude the lock block 2351. After the lock block 2351 is pressed, it is retracted in the direction of the locking rod 2353, and when the fixed hook 239 descends and slides through the lock block 2351, the lock block 2351 rebounds under the elastic force of the self-locking spring 2354. The lock block 2351 abuts against the clamping groove on the fixed hook 239 to prevent the fixed hook 239 from rebounding, thereby achieving automatic locking of the filter screen assembly 23. After the control system determines that the filter screen assembly 23 is locked through the monitoring element, the entire fresh air fan set is closed, then the first electric fan is opened in reverse, and the first electric valve at the bottom of the bottom turntable 236 is closed.

[0054] The filter screen support 231 is locked, and the telescopic rod 234 is driven to descend synchronously. When the self-locking is completed, the telescopic rod 234 extends into the secondary supercharging assembly 24. At this time, the bottom of the telescopic rod 234 is aligned with the transmission plate 242. When the first electric fan 3 drives the secondary supercharging assembly 24 to rotate reversely, the transmission plate 242 on the secondary supercharging assembly 24 pushes the telescopic rod 234 to rotate together. The telescopic rod 234 drives the entire filter screen assembly 23 to rotate on the conical shell 216. The control system opens the spray washing assembly 22. The high-pressure water supply device 221 inputs high-pressure water flow into the spray rod 224. The high-pressure water flow is sprayed from the spray head 225 to form water mist. When the secondary supercharging assembly 24 rotates reversely, the air in the fresh air inlet cabin 15 is driven to flow into the supercharging chamber 25 upward. Since the first electric valve is closed, the air pressure in the supercharging chamber 25 rises. The control system opens the second electric valve. The air enters the air injection pipe 223 from the air exhaust hole 214 under the action of the pressure. The air injection pipe 223 guides the high-pressure gas into the inside of the filter screen sheet 232. The high-pressure gas mixes with the water mist to wash the filter screen sheet 232 from inside to outside. The dust on the filter screen sheet 232 is cleaned under the impact and washing of the high-pressure gas-liquid mixture. At the same time, the filter screen sheet 232 in the rotating state is centrifuged under the action of the centrifugal force. The dust attached to the filter screen sheet 232 is thrown out first. The clean water on the filter screen sheet 232 is centrifuged to dry. Thus, the purposes of filter screen cleaning and centrifugal drying are achieved.

[0055] The thrown-out sewage and dust fall to the annular filter screen 211 under the action of gravity. The annular filter screen 211 filters the dust in the sewage. The filtered water falls into the bottom of the cleaning cylinder 213, is discharged from the drain pipe 212, and is recycled. Thus, the purposes of sewage cleaning, filtration and recycling are achieved.

[0056] When the filter screen sheet 232 is dried, the control system energizes the electromagnetic ring 215. The electromagnetic ring 215 generates magnetic force to attract the adsorption block 2352 after being energized. The adsorption block 2352 drives the lock block 2351 to retract through the lock rod 2353, so that the lock block 2351 is separated from the fixed hook 239. After the fixed hook 239 loses the constraint, the filter screen support 231 drives the filter screen sheet 232 to rebound and reset under the action of the spring. Then, the control system drives other components to reset. Thus, the self-cleaning of the filter screen assembly 23 is achieved.

[0057] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalency of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

Claims

1. A fresh air unit for a positive control laboratory, characterized by: The new air handling unit includes a casing (1), in which a condenser (5) and an evaporator (6) are installed. A sterilizer (7) and a compressor (8) are also installed in the casing (1). A self-cleaning filter (2) is installed in the casing (1). A first electric fan (3) and a second electric fan (4) are installed in the casing (1). The first electric fan (3) and the self-cleaning filter (2) are meshed and driven. A filter (9) is installed in the casing (1). The clean filtration device (2) includes a cleaning housing (21) and a spray washing assembly (22). The cleaning housing (21) is mounted on the chassis (1). A filter assembly (23) is rotatably mounted inside the cleaning housing (21). A secondary pressurization assembly (24) is rotatably mounted on the cleaning housing (21). The spray washing assembly (22) is mounted on the cleaning housing (21). The spray washing assembly (22) passes through the filter assembly (23). The spray washing assembly (22) is rotatably connected to the filter assembly (23). The cleaning housing (21) and the filter assembly (23) form a cleaning chamber (26), and the filter assembly (23), the secondary pressurization assembly (24) and the cleaning housing (21) form a pressurization chamber (25). The first electric fan (3) is equipped with a transmission column (31) at its bottom end. The transmission column (31) is provided with a first inclined surface (34) and a first bevel tooth. The housing (1) is rotatably mounted with a transmission rod (32). One end of the transmission rod (32) is equipped with a first bevel gear (33) and the other end of the transmission rod (32) is equipped with a second bevel gear (35). The transmission column (31) is driven by meshing with the first bevel gear (33) through the first bevel tooth, and the second bevel gear (35) is driven by meshing with the secondary booster assembly (24). The cleaning housing (21) includes a cleaning cylinder (213), a conical shell (216) is installed at the bottom of the cleaning cylinder (213), an exhaust hole (214) is provided on the conical shell (216), an electromagnetic ring (215) is installed at the top of the conical shell (216), an annular filter screen (211) is installed on the cleaning cylinder (213), a drain pipe (212) is installed at the bottom of the cleaning cylinder (213), a secondary pressurization assembly (24) is rotatably installed at the bottom of the conical shell (216), and a filter screen assembly (23) is rotatably installed at the top of the conical shell (216). The secondary booster assembly (24) includes a booster ring (244), which is rotatably mounted on the bottom end of a conical shell (216). A transmission plate (242) is mounted on the booster ring (244), a fan blade (241) is provided on the booster ring (244), a second inclined surface (243) is provided on the booster ring (244), and a second bevel tooth is provided on the second inclined surface (243). The booster ring (244) is driven by meshing with a second bevel gear (35) through the second bevel tooth. The filter assembly (23) includes a bottom turntable (236), on which a locking groove (2362) is provided, and a locking mechanism (235) is slidably installed in the locking groove (2362). The spray washing assembly (22) includes a jet pipe (223) and a rotating ring (226). The rotating ring (226) is provided with a first hole (2261) and a second hole (2262). One end of the jet pipe (223) is connected to the first hole (2261), and the other end of the jet pipe (223) is connected to the pressurization chamber (25) through an exhaust hole (214).

2. A fresh air unit for positive control laboratories as claimed in claim 1, wherein: The filter assembly (23) also includes a filter support (231), on which a filter sheet (232) is installed. A telescopic rod (234) is installed at the bottom of the filter support (231). The telescopic rod (234) passes through the bottom turntable (236) and is fitted with a support plate (238). A telescopic spring (237) is installed between the support plate (238) and the bottom turntable (236). A flexible telescopic tube (233) is installed between the filter support (231) and the bottom turntable (236). The bottom turntable (236) is rotatably mounted on the top of the conical shell (216). The flexible telescopic tube (233) is made of a flexible and stretchable material. The bottom turntable (236), the conical shell (216), and the secondary pressurization assembly (24) form a pressurization chamber (25).

3. A fresh air unit for positive control laboratories as claimed in claim 2, wherein: The filter support (231) is equipped with a fixing hook (239) at the bottom end, the bottom turntable (236) is provided with a sliding hole (2361), the bottom turntable (236) is provided with a first electric valve, the telescopic rod (234) is slidably connected to the bottom turntable (236) through the sliding hole (2361), and the fixing hook (239) corresponds to the locking mechanism (235).

4. A fresh air handling unit for a positive control laboratory according to claim 3, characterized in that: The locking mechanism (235) includes a locking rod (2353), which is slidably mounted on the bottom turntable (236). One end of the locking rod (2353) is equipped with an adsorption block (2352), and the other end of the locking rod (2353) is equipped with a locking block (2351). A self-locking spring (2354) is installed between the locking block (2351) and the bottom turntable (236). The adsorption block (2352) and the electromagnetic ring (215) are located on the same plane.

5. A fresh air handling unit for a positive control laboratory according to claim 4, characterized in that: The spray washing assembly (22) also includes a spray rod (224) and a connecting plate (222). The connecting plate (222) is installed on the chassis (1). A high-pressure water supply device (221) is installed on the connecting plate (222). The spray rod (224) is installed at the bottom of the high-pressure water supply device (221). The spray rod (224) is internally connected to the high-pressure water supply device (221). Several spray heads (225) are installed on the spray rod (224). A second electric valve is provided at one end of the jet pipe (223) connected to the exhaust port (214). The spray rod (224) is movably connected to the rotating ring (226) through the second hole (2262). The rotating ring (226) is rotatably installed on the top of the filter screen support (231).

6. A fresh air handling unit for a positive control laboratory according to claim 1, characterized in that: The top of the chassis (1) is provided with a fresh air inlet (11), a fresh air outlet (12), a return air inlet (13) and a return air outlet (14). The chassis (1) is provided with a fresh air intake chamber (15), a fresh air outlet chamber (16), a return air intake chamber (17) and a return air outlet chamber (18). The self-cleaning filter device (2) is located at the top of the fresh air intake chamber (15). The first electric fan (3) and the sterilizer (7) are located in the fresh air outlet chamber (16). The filter (9) and the compressor (8) are located in the return air intake chamber (17). The second electric fan (4) is located in the return air outlet chamber (18). An evaporator (6) is provided between the fresh air intake chamber (15) and the fresh air outlet chamber (16). A condenser (5) is provided between the return air intake chamber (17) and the return air outlet chamber (18).

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