Non-stop online cleaning method and device for filter screen at return air inlet of public building air conditioner

Abstract

The invention provides a non-stop online cleaning method and device for a public building air conditioner return air inlet filter screen, and relates to the technical field of air conditioners. Which comprises a first driving mechanism, a filter screen device, a cleaning device, a second driving mechanism, a reciprocating motion device, an air-water supply device, a gate device and an ultraviolet germicidal lamp, and has the beneficial effects that firstly, two groups of filter screens can freely switch positions between an air return box and a cleaning box, so that online cleaning without disassembly can be met under the condition of no shutdown; the air quality of return air can be guaranteed; secondly, a triple cleaning mode of water washing, blow-drying and ultraviolet sterilization is adopted, so that not only can the cleanness and smoothness of the filter screen be ensured, but also the filter screen can be ensured not to breed, have bacteria or rust; then, a gate device is installed between the air return box and the cleaning box, a partition door of the gate device can ascend and descend, the filter screen can move freely, and it can be guaranteed that cleaning water cannot flow into the air return box; and finally, the controller is adopted for intelligent control, the labor cost is saved, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular discloses a method and a device for online cleaning of a filter screen of a return air outlet of an air conditioner in a public building without stopping the machine. Background Art

[0002] The return air filter of the air conditioner is an air filtration device installed at the return air outlet of the terminal equipment of the air supply system of the air conditioner, such as the indoor unit of the household air conditioner, the terminal fan coil of the central air conditioning system, the ceiling air conditioner, etc., all of which are equipped with a return air filter. The filter has a primary filtering and purification effect on some larger particles (such as dust, fiber, etc.), which can improve the air quality, reduce the content of pollutants in the indoor air, and protect people's health. At the same time, after filtering the air through the filter, it can also protect the equipment and parts and extend the overall service life of the air conditioner.

[0003] In order to protect the health of people and equipment, the return air filter needs to be cleaned regularly, but in actual use, it is very troublesome to clean the air conditioner filter. Household air conditioners can also disassemble and clean the filter regularly, but it is a problem to clean the air conditioner filter in large public areas such as shopping malls, office buildings, workshops, waiting halls, etc. It is mainly reflected in two aspects: 1. Large public areas are wide and large in space, with a large number of air conditioners and return air filter. If the disassembly and cleaning workload is very large; 2. Most public areas need to ensure that the air conditioner can run for a long time without stopping. If the filter is directly removed for cleaning, the indoor air quality during the cleaning period cannot be guaranteed. However, large public areas are generally densely populated, and the indoor air quality can easily deteriorate. If the indoor air quality is to be guaranteed, cleaning the return air filter is a necessary step. Therefore, it is of great significance to solve the problem of cleaning the return air filter of the air conditioner terminal equipment in large public areas.

[0004] From the searched patent documents, in the prior art, the technical solutions for cleaning the return air filter are almost all to remove the filter for cleaning, such as the utility model patent "A cleaning device for air conditioning filter (patent number: 202021451413.9)", the utility model patent "An air conditioning filter cleaning device (patent number: 202020712147.4)", the utility model patent "An air conditioning filter automatic cleaning device (patent number: 201920415382.2), etc. Such technical solutions are inefficient and require shutdown and filter disassembly, which are not suitable for cleaning the return air filter of air conditioners in large public buildings.

[0005] The invention of this application is based on provincial and municipal scientific research projects. According to the above problem analysis and the inventor's engineering experience, a method and device for online cleaning of the return air vent filter of a public building air conditioner without stopping the machine is proposed. Summary of the invention

[0006] Large public building areas need to ensure the respiratory health of densely populated people. The present invention solves the problem that there are many air conditioners and return air vents in large public buildings, which requires a lot of work to disassemble and clean, and the air conditioners need to run continuously and cannot be cleaned online. The technical solutions provided by the method and device for online cleaning of the return air vent filter of the air conditioner in public buildings without stopping are as follows: The method for online cleaning of the return air outlet filter of a public building air conditioner without stopping the machine includes two sets of identical filter devices, wherein the filter of one set of filter devices is located at the return air outlet in the return air box, and the other filter is located in the cleaning box; the steps of the online intelligent cleaning method are as follows: S1: When the air conditioner return air pressure difference sensor detects that the pressure difference value ΔP is greater than the set threshold P1 When , execute step S2, otherwise the return air pressure difference sensor periodically detects the return air pressure difference ΔP at the return air outlet; S2: The controller turns on the ultraviolet sterilization lamp to disinfect the filter in the cleaning box, and sends a timing signal to the clock to start timing; S3: The controller receives the clock timing signal and the sterilization time T1 Then the timing stops and the controller controls the ultraviolet germicidal lamp to turn off; S4: The controller controls the gate device between the return air box and the cleaning box to start, and the gate device stops after the partition door of the gate device is fully raised, that is, the movement of the filter device between the return air box and the cleaning box is not affected; S5: The controller controls the first driving mechanism to start, and the first driving mechanism drives the two sets of filter devices to move synchronously in opposite directions until the relative positions of the two sets of filter devices are swapped and the first driving mechanism stops, that is, the filter device originally at the return air outlet is located in the cleaning box, and the filter device originally in the cleaning box is located at the return air outlet; S6: The controller controls the gate device to start, and the partition door descends until it is completely closed. After that, the gate device stops, isolating the return air box and the cleaning box to prevent water in the cleaning box from entering the return air box; S7: The controller controls the electromagnetic water valve on the water pipe to open, and at the same time, controls the booster water pump to start; the booster water pump can boost the water pressure; S8: The controller sends a signal to the clock to start timing; at the same time, the controller controls the second driving mechanism to start, and the second driving mechanism drives the reciprocating device in the cleaning box to reciprocate; and the controller controls the cleaning device installed on the reciprocating device to start, and the water from the booster pump cleans the filter; S9: The controller receives the clock signal to preset the cleaning time T2 , the controller controls the cleaning device and the second driving device to stop, the cleaning is completed, and the reciprocating device returns to its original position; S10: The controller controls the booster water pump to stop and the electromagnetic water valve on the water pipe to close. At the same time, the electromagnetic air valve on the air pipe is opened and the blower is started. The air from the blower dries the filter to prevent the filter from being rusted and breeding bacteria due to long-term moisture. S11: The controller receives the clock signal to preset the blowing time T3 After that, the clock stops timing, the controller controls the blower to stop and controls the electromagnetic valve to close; S12: Return to step S1.

[0007] Furthermore, the prerequisite for turning on the ultraviolet germicidal lamp is: or, a specific date or cycle.

[0008] Furthermore, the water comes from the condensed water collected in the water storage tank, and the gas comes from the filtered return air in the return air box.

[0009] The cleaning device comprises a box body, which comprises a first power box with a first power mechanism installed inside, a second power box with a second power mechanism installed inside, a return air box and a cleaning box and a water storage tank arranged between the first power box and the second power box, and a gate device is installed between the return air box and the cleaning box; the return air box has a return air port on the bottom surface and an air conditioning connection port on the side surface; and also comprises a water vapor supply device and an ultraviolet sterilization lamp installed on the top of the cleaning box; The two groups of identical filter devices arranged up and down include two third screw rods, four third sliders slidably threadedly sleeved with the third screw rods, a filter connected to the third sliders, and a third bevel gear fixed to the end of the third screw rod and located in the first power box. One end of the third screw rod is connected to the side wall of the first power box through a bearing wheel, and the other end is connected to the side wall of the second power box through a bearing wheel. The filter device is driven by the first power mechanism; The reciprocating motion device comprises two fourth screw rods, two fourth sliders respectively connected with the fourth screw rods by sliding threads, and a fourth bevel gear fixed to the end of the fourth screw rod and located in the second power box; the reciprocating motion device is driven by the second power mechanism; The cleaning device installed on the reciprocating device includes a cleaning motor and a roller brush. The cleaning motor is installed on one of the fourth sliders. One end of the roller brush is fixed to the cleaning motor rotor, and the other end is connected to another fourth slider through a bearing wheel.

[0010] Furthermore, the first power mechanism includes a first drive motor, two first connecting rods arranged up and down, four first bevel gears fixed on the first connecting rods, two pulleys fixed on the first connecting rods, and a belt connecting the two pulleys, the directions of the two upper first bevel gears are completely opposite to the two lower first bevel gears, the first bevel gears are meshed with the third bevel gears, one end of one of the first connecting rods is fixed to the rotor of the first drive motor, and the other end is connected to the first power box through a bearing wheel, and both ends of the other first connecting rod are connected to the first power box through the bearing wheel; The second power mechanism includes a second drive motor, a second connecting rod and two second bevel gears fixed on the second connecting rod. One end of the second connecting rod is fixed to the second drive motor rotor, and the other end is connected to the side wall of the second power box through a bearing wheel. The second bevel gear is meshed with the fourth bevel gear.

[0011] Furthermore, the water and gas supply device includes a shower head installed on the top of the cleaning box, an electromagnetic water valve installed on the water pipe, an electromagnetic air valve installed on the air pipe, a booster water pump, a hair dryer and a three-way pipe. An air hole is opened on the top of the return air box, a water outlet hole is opened on the side of the water storage tank, and an inlet hole is opened on the top of the cleaning box; the inlet of the booster water pump is connected to the water outlet hole through a water pipe, and its outlet is connected to the three-way pipe through a water pipe, the inlet of the hair dryer is connected to the air hole through an air pipe, and the outlet is connected to the three-way pipe through the air pipe, and the other end of the three-way pipe is connected to the shower head through the pipe inlet hole through a pipeline.

[0012] Furthermore, a condensation hole for recovering air-conditioning condensed water is opened on the top surface of the water tank, an overflow port is opened on the top of the side wall of the water tank, and a drainage hole is opened on the bottom surface of the cleaning box. The overflow port is connected with the drainage hole through a water pipe and then drained or vented through a drainage pipe.

[0013] Furthermore, the gate device includes a gate motor, a fifth screw rod, a fifth slider, a connecting block, a mounting block and a partition door. The cleaning box has a fixed plate and two ear door plates on the side close to the return air box. The fixed plate is fixed to the ear door plate. A guide groove is provided on the fixed plate. One end of the fifth screw rod is fixed to the gate motor rotor, and the other end is rotatably connected to the mounting block. The fifth slider is slidably threadedly sleeved with the fifth screw rod. One end of the connecting block is fixed to the fifth slider, and the other end passes through the guide groove and is fixed to the partition door. When the partition door is lowered to the lowest point, it can prevent water in the cleaning box from entering the return air box.

[0014] Furthermore, it also includes a waterproof cover installed on the fixed plate at the gate device to prevent water from passing through the guide groove; the fourth screw rod passes through the ear door plate, and two "U"-shaped holes are respectively provided on the sides of the two ear door plates; it also includes a waterproof shell wrapping the third screw rod and the third slider, and a connecting groove is provided on the waterproof shell, and a connecting strip is provided on the third slider, which passes through the connecting groove and is fixed to the filter, and the size of the "U"-shaped hole is adapted to the third slider and the filter.

[0015] Furthermore, a drainage groove is provided at the bottom of the waterproof shell located in the cleaning box.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The method and device for online cleaning of return air vent filters of air conditioners in public buildings without stopping the machine include two groups of filter devices, a water tank, a water vapor supply device, and a cleaning device. When the set conditions are met, the entire device can be cleaned online, which is specifically manifested in two aspects: on the one hand, there is no need to disassemble the filter for cleaning as in some prior arts, and online cleaning improves cleaning efficiency and saves labor costs; on the other hand, the two groups of filters automatically switch positions, which can ensure that the filter can be cleaned without stopping the machine, and can also ensure the air filtration quality of the return air without stopping the machine.

[0017] 2. The method and device for online cleaning of the return air filter of the air conditioner in public buildings without stopping the machine adopts a triple cleaning method of water washing, drying and ultraviolet sterilization, which can clean the foreign matter attached to the filter and ensure that the filter is dried in time without breeding bacteria and rust, and can also automatically perform sterilization and disinfection before replacement. In general, it not only ensures the ventilation effect, but also improves the air quality of the filtered return air.

[0018] 3. The present invention provides a method and device for online cleaning of the return air vent filter of a public building air conditioner without stopping the machine. The water used for cleaning comes from the condensed water of the air conditioner, and the air used for drying comes from the return air. The design method of using local materials can not only ensure the water and air supply for cleaning the filter, but also recycle and utilize water resources to save water; at the same time, the return air as the air source for drying can also ensure the quality of the air to a certain extent. In addition, the water storage tank is provided with an overflow port, that is, the condensed water is running water that has not been stored for a long time, which can also ensure the cleanliness of the cleaning water to a certain extent.

[0019] 4. The method and device for online cleaning of the return air filter of an air conditioner in a public building without stopping the machine, a gate device is provided between the return air box and the cleaning box, and the separation door is raised and lowered to ensure that water will not flow into the return air box and affect the dryness of the return air during the cleaning of the filter, and the filter device can be smoothly moved between the return air box and the cleaning box. A waterproof cover and a waterproof shell are also provided to further prevent water from entering the return air box, and a water leakage groove is provided at the bottom of the waterproof shell inside the cleaning box to further prevent the water from overflowing from the top into the return air box when the waterproof shell is full.

[0020] 5. The present invention provides a method and device for online cleaning of the return air filter of a public building air conditioner without stopping the machine. The cleaning device is arranged in the middle of the upper and lower groups of filter devices, that is, one set of cleaning device can be used to clean the filters of the upper and lower groups of filter devices respectively. The above design is ingenious and can save the manufacturing cost of the device.

[0021] 6. The method and device for online cleaning of the return air filter of an air conditioner in a public building without stopping the machine adopts a controller to realize intelligent closed-loop control of the entire device, and does not require human intervention. It is particularly suitable for large public areas with dense crowds, can continuously ensure the cleaning efficiency, greatly shorten the cleaning time, save labor costs, and automatically clean to improve the air quality and ventilation effect of the return air. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention from the bottom surface angle; Figure 3 It is a control structure block diagram of the cleaning method of the present invention; Figure 4 It is a schematic diagram of the filter device and transmission structure of the present invention; Figure 5 It is a schematic diagram of the cleaning device and transmission structure of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the water vapor supply device of the present invention; Figure 7 It is a connection block diagram of the water vapor supply device of the present invention; Figure 8 It is a schematic diagram of the internal structure of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the gate device of the present invention; Fig.10 It is a schematic diagram of the structure of the ultraviolet germicidal lamp and the shower head of the present invention; Fig.11 It is a schematic diagram of the structure of the waterproof cover of the gate device of the present invention; Fig.12 It is a schematic diagram of the three-dimensional structure of the waterproof shell of the present invention; Fig.13 The present invention Fig.12 Enlarged view of point A in the middle; Fig.14 It is a schematic diagram of the bottom structure of the waterproof shell of the present invention.

[0023] The above figures are marked: 1. Box body; 11. Return air box; 111. Air conditioning connection port; 112. Return air port; 113. Air hole; 12. Cleaning box; 121. Drain hole; 122. Ear door plate; 1221. "U"-shaped hole; 123. Fixed plate; 1231. Guide groove; 124. Inlet hole; 13. First power box; 14. Second power box; 15. Water storage tank; 151. Condensate hole; 152. Overflow port; 153. Water outlet; 2. First power mechanism; 21. First drive motor; 22. Pulley; 23. Belt; 24. First bevel gear; 25. First connecting rod; 3. Filter device; 31. Third bevel gear; 32. Filter; 33. Third slider; 34. Third screw rod; 35. Connecting strip; 36. Waterproof shell; 361. Connecting groove; 362. Leakage groove; 4. Reciprocating motion device; 41. fourth slider; 42. fourth screw rod; 43. fourth bevel gear; 5. second power mechanism; 51. second drive motor; 52. second bevel gear; 53. second connecting rod; 6. cleaning device; 61. cleaning motor; 62. roller brush; 7. gate device; 71. gate motor; 72. fifth screw rod; 73. fifth slider; 74. connecting block; 75. mounting block; 76. partition door; 77. waterproof cover; 8. water and gas supply device; 81. shower; 82. electromagnetic water valve; 83. electromagnetic gas valve; 84. three-way pipe; 85. booster pump; 86. hair dryer; 9. ultraviolet sterilization lamp. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1 Reference Figure 1-10 The method for online cleaning of the return air outlet filter of a public building air conditioner without stopping the machine comprises two sets of identical filter devices 3, wherein the filter 32 of one set of filter devices 3 is located at the return air outlet 112 in the return air box 11, and the filter 32 of the other set of filter devices 3 is located in the cleaning box 12. The steps of the online cleaning method are as follows: S1: When the air conditioner return air pressure difference sensor detects that the pressure difference value ΔP is greater than the set threshold P1 When the air conditioner returns to the air outlet 112, the step S2 is executed; otherwise, the air conditioner return air pressure difference sensor periodically detects the return air pressure difference at the return air outlet 112; S2: The controller controls the ultraviolet sterilization lamp 9 to turn on, disinfects and sterilizes the filter 32 in the cleaning box 12, and sends a timing signal to the clock to start timing; Threshold P1 It can be set to 100Pa.

[0026] S3: The controller receives the clock timing signal and the sterilization time T1 Then the timing stops and the controller controls the ultraviolet germicidal lamp 9 to turn off; T1 The setting range can be 30 to 60 minutes; S4: The controller controls the gate device 7 between the return air box 11 and the cleaning box 12 to start, and the gate device 7 stops after the partition door 76 of the gate device 7 is fully raised, that is, the movement of the filter device 3 between the return air box 11 and the cleaning box 12 is not affected; S5: The controller controls the first driving mechanism 2 to start, and the first driving mechanism 2 drives the two groups of filters 32 to move synchronously in opposite directions until the relative positions of the two groups of filters 32 are interchanged and the first driving mechanism 2 stops, that is, the filter 32 originally located at the return air outlet 112 is located in the cleaning box 12, and the filter device 3 originally located in the cleaning box 12 is located at the return air outlet 112; S6: The controller controls the gate device 7 to start, and the partition door 76 descends until it is completely closed. After that, the gate device 7 stops, and the return air box 11 and the cleaning box 12 are separated to prevent water in the cleaning box 12 from entering the return air box 11; S7: The controller controls the electromagnetic water valve 83 on the water pipe to open, and at the same time, controls the booster water pump 85 to start; the booster water pump 85 can boost the water pressure; S8: The controller sends a signal to the clock to start timing; at the same time, the controller controls the second driving mechanism 5 to start, and the second driving mechanism 5 drives the reciprocating device 4 located in the cleaning box 12 to reciprocate; and the controller controls the cleaning device 6 installed on the reciprocating device 4 to start, and the water from the booster water pump 85 cleans the filter 32; S9: The controller receives the clock signal to preset the cleaning time T2 , the controller controls the cleaning device 6 and the second driving device mechanism 5 to stop, the cleaning is completed, and the reciprocating motion device 4 returns to its original position; T2 The setting range can be 5-10 minutes; S10: The controller controls the booster water pump 85 to stop and the electromagnetic water valve 83 on the water pipe to close. At the same time, the electromagnetic air valve 82 on the air pipe is opened and the blower 86 is started. The air from the blower 86 dries the filter 32 to prevent the filter 32 from being rusted and breeding bacteria due to being wet for a long time. S11: The controller receives the clock signal to preset the blowing time T3 After the clock stops timing, the controller controls the blower 86 to stop and controls the electromagnetic valve 82 to close; T3 The setting range can be 5-10 minutes; S12: Return to step S1.

[0027] The online intelligent cleaning method in the above technical solution, during the entire operation of the air conditioner, takes the front and rear wind pressure difference caused by the long-term attachment and accumulation of foreign matter in the air to the filter 32 as a condition, and intelligently cleans the filter 32 of the return air outlet 112 online, without the need for human intervention, and without the need to disassemble the filter 32 for cleaning, thus saving labor costs, and without the need to shut down the air conditioner for cleaning, thus ensuring the need for continuous operation. Moreover, the filter 32 is triple-cleaned by washing, drying, and sterilization, which guarantees the cleanliness of the filter 32 to the greatest extent and improves the filtration quality of the return air.

[0028] In specific implementation, the precondition for turning on the ultraviolet disinfection lamp 9 is: or, a specific date or cycle. For example, at 12:00 noon on June 25, 2024, or once a month, similar to the precondition for car maintenance, which is the mileage or the preset maintenance interval. The cleaning frequency and cleanliness of the filter 32 are guaranteed from multiple angles.

[0029] In specific implementation, water comes from condensed water collected in the water storage tank 15, and air comes from the filtered return air in the return air box 11. The filtered return air is relatively clean, preventing the filter 32 being cleaned from being contaminated again. If it is summer, collecting condensed water as a cleaning water source can save water according to local conditions.

[0030] Example 2 Reference Figure 1-10 , a cleaning device, based on the online cleaning method for the return air vent filter of an air conditioner in a public building without stopping the machine in Example 1, comprises a box body 1, which comprises a first power box 13 with a first power mechanism 2 installed inside, a second power box 14 with a second power mechanism 5 installed inside, a return air box 11 and a cleaning box 12 and a water storage tank 15 arranged between the first power box 13 and the second power box 14, a gate device 7 is installed between the return air box 11 and the cleaning box 12; the return air box 11 has a return air vent 112 on the bottom surface and an air conditioning connection port 111 on the side; it also comprises a water vapor supply device 8 and an ultraviolet sterilization lamp 9 installed on the top of the cleaning box 12.

[0031] The two groups of identical filter devices 3 arranged up and down include two third screw rods 34, four third sliders 33 slidingly threadedly sleeved with the third screw rods 34, a filter 32 connected to the third sliders 33, and a third bevel gear 31 fixed to the end of the third screw rod 34 and located in the first power box 13. One end of the third screw rod 34 is connected to the side wall of the first power box 13 through a bearing wheel, and the other end is connected to the side wall of the second power box 14 through a bearing wheel; the filter device 3 is driven by the first power mechanism 2.

[0032] The reciprocating motion device 4 includes two fourth screw rods 42, two fourth sliders 41 respectively slidably threadedly sleeved with the fourth screw rods 42, and a fourth bevel gear 43 fixed to the end of the fourth screw rod 42 and located in the second power box 14; the reciprocating motion device 4 is driven by the second power mechanism 5.

[0033] The cleaning device 6 installed on the reciprocating motion device 4 includes a cleaning motor 61 and a roller brush 62. The cleaning motor 61 is installed on one of the fourth sliders 41. One end of the roller brush 62 is fixed to the rotor of the cleaning motor 61, and the other end is connected to the other fourth slider 41 through a bearing wheel.

[0034] In the above technical solution, the two groups of filters 32 can be exchanged through the first power mechanism 2, that is, when the filter 32 at the return air outlet 112 needs to be cleaned, it is moved to the cleaning box 12 for cleaning, and at the same time, the other filter 32 in the cleaning box 12 is moved to the return air outlet 112, which not only ensures the convenience of online non-disassembly cleaning, but also ensures that the quality of the return air can be continuously and effectively guaranteed without stopping the machine. In addition, the cleaning device 6 is located in the middle of the two groups of filters 32, that is, one set of cleaning device 6 can be used to clean the upper and lower groups of filters 32 respectively.

[0035] For specific implementation, please refer to the attached Figure 4 The first power mechanism 2 includes a first drive motor 21, two first connecting rods 25 arranged up and down, four first bevel gears 24 fixed on the first connecting rods 25, two pulleys 22 fixed on the first connecting rods 25, and a belt 23 connecting the two pulleys 22. The directions of the upper two first bevel gears 24 and the lower two first bevel gears 24 are completely opposite, that is, when the first drive motor 21 is started, the upper and lower filter screens 32 move in opposite directions to ensure that after the first drive motor 21 stops, there is always one filter screen 32 in the cleaning box 12 and the other filter screen 32 in the return air box 11. The first bevel gear 24 is meshed with the third bevel gear, one end of one of the first connecting rods 25 is fixed to the rotor of the first drive motor 21, and the other end is connected to the first power box 13 through a bearing wheel, and both ends of the other first connecting rod 25 are connected to the first power box 13 through bearing wheels.

[0036] Reference Figure 5 The second power mechanism 5 includes a second drive motor 51, a second connecting rod 53 and two second bevel gears 52 fixed on the second connecting rod 53. One end of the second connecting rod 53 is fixed to the rotor of the second drive motor 51, and the other end is connected to the side wall of the second power box through a bearing wheel. The second bevel gear 52 is meshed with the fourth bevel gear 43.

[0037] For specific implementation, please refer to the attached Figure 6 and 710. The water and gas supply device 8 includes a shower head 81 installed on the top of the cleaning box 12, an electromagnetic water valve 82 installed on the water pipe, an electromagnetic air valve 83 installed on the air pipe, a booster water pump 85, a hair dryer 86 and a three-way pipe 84. An air hole 113 is opened on the top of the return air box 11, a water outlet hole 153 is opened on the side of the water storage tank 15, and an inlet hole 124 is opened on the top of the cleaning box 12; the inlet of the booster water pump 85 is connected with the water outlet hole 153 through a water pipe, and its outlet is connected with the three-way pipe 84 through a water pipe, the inlet of the hair dryer 86 is connected with the air hole 113 through an air pipe, and the outlet is connected with the three-way pipe 84 through an air pipe, and the other end of the three-way pipe 84 is connected to the shower head 81 through the pipe inlet hole 124 through a pipeline.

[0038] In the above technical solution, the filter 32 is cleaned by water washing and air drying, so that the filter 32 is clean during the standby period and can avoid the humid environment and the breeding of bacteria.

[0039] For specific implementation, please refer to the attached Figure 1 and 2 , the top surface of the water tank 15 is provided with a condensation hole 151 for recycling the condensation water of the air conditioner, so that water can be used according to local conditions in summer, which not only ensures the water for cleaning the filter 32, but also ensures the recycling of condensation water to achieve the purpose of saving water resources. Of course, further, if the air conditioner needs to be operated in non-summer, a tap water pipeline can be added to the water tank 15 to make up for the problem of cleaning water in the season without condensation water, but this solution requires the installation of a water valve on the tap water pipeline, and a liquid level gauge is also required. In order to save water resources, the water in the water tank 15 cannot be running water, and the water valve on the tap water pipeline is opened only before cleaning is required. An overflow port 152 is provided on the top of the side wall of the water tank 15, and a drain hole 121 is provided on the bottom surface of the cleaning box 12. The overflow port 152 is connected to the drain hole 121 through a water pipe and then drained or vented with the drain pipe. In addition, during the operation of the booster pump 85 and the blower 86, those skilled in the art should understand that the drain hole 121 needs to be kept unobstructed with the external environment and can meet the requirements of smooth drainage and exhaust. The overflow port 152 is provided to ensure the drainage requirement and the fluidity of the condensed water, thereby preventing bacteria from growing due to long-term storage.

[0040] For specific implementation, please refer to the attached Figure 8 and 9The gate device 7 includes a gate motor 71, a fifth screw rod 72, a fifth slider 73, a connecting block 74, a mounting block 75 and a partition door 76. The cleaning box 12 has a fixing plate 123 and two ear door plates 122 near the return air box 11. The fixing plate 123 is fixed to the ear door plate 122. A guide groove 1231 is provided on the fixing plate 123. One end of the fifth screw rod 72 is fixed to the rotor of the gate motor 71, and the other end is rotatably connected to the mounting block 75. The fifth slider 73 is slidably threaded with the fifth screw rod 72. One end of the connecting block 74 is fixed to the fifth slider 73, and the other end passes through the guide groove 1231 and is fixed to the partition door 76. When the partition door 76 drops to the lowest point, it can prevent water in the cleaning box 12 from entering the return air box 11.

[0041] For specific implementation, please refer to the attached Fig.11 , and also includes a waterproof cover 77 installed on the fixing plate 123 at the gate device 7 to prevent water from passing through the guide groove 1231; refer to the attached Fig.12 and 13 The fourth screw rod 42 passes through the ear door plate 122, and two "U"-shaped holes 1221 are respectively provided on the sides of the two ear door plates 122; it also includes a waterproof shell 36 that wraps the third screw rod 34 and the third slider 33, and a connecting groove 361 is provided on the waterproof shell 36. The third slider 33 is provided with a connecting strip 35, and the connecting strip 35 passes through the connecting groove 361 and is fixed to the filter 32. The size of the "U"-shaped hole 1221 is adapted to the third slider 33 and the filter 32.

[0042] For specific implementation, please refer to the attached Fig.14 The waterproof shell 36 is located in the cleaning box 12 and has a drainage groove 362 at the bottom.

[0043] In the above technical solution, firstly, water will enter the waterproof shell 36 from the connecting groove 361 during cleaning, but since the waterproof shell 36 is located in the cleaning box 12 and has a water leakage groove 362 at the bottom, the water entering the waterproof shell 36 will eventually flow into the cleaning box 12, and will not flow into the return air box 11. Secondly, since the size of the "U"-shaped hole 1221 is adapted to the third slider 33 and the filter screen 32, the cleaning water will not flow into the return air box 11 from the "U"-shaped hole 1221. Finally, a waterproof cover 77 is installed at the guide groove 1231 to prevent water from entering the return air box 11 from the guide groove 1231. That is, during the cleaning process of the filter screen 32, the cleaning water is prevented from entering the return air box 11 to the greatest extent possible to affect the dryness of the return air. In order to further ensure the sealing performance, waterproof strips can also be installed on the edges of the partition door 76, the "U"-shaped hole 1221, and the waterproof cover 77.

[0044] In specific implementation, the fan generating the return air can be arranged at the air conditioner connection port 111. Furthermore, a drainage solenoid valve can be arranged on the drainage pipe at the drain hole 121, and the drainage solenoid valve is opened during cleaning and drying, and the drainage solenoid valve is located above the place where the overflow port 152 is connected to the drainage pipe, that is, there is no restriction on the drainage coming out of the overflow port 152.

[0045] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for online cleaning of the return air filter of a public building air conditioner without stopping the machine, characterized in that: The invention comprises two sets of identical filter screen devices (3), wherein the filter screen (32) of one set of filter screen devices (3) is located at the return air port (112) in the return air box (11), and the other filter screen (32) is located in the cleaning box (12); the steps of the online cleaning method are as follows: S1: When the air conditioner return air pressure difference sensor detects that the pressure difference value ΔP is greater than the set threshold P1 When the return air pressure difference sensor detects the return air pressure difference at the return air inlet (112) periodically, step S2 is executed; otherwise, the return air pressure difference sensor periodically detects the return air pressure difference at the return air inlet (112); S2: The controller controls the ultraviolet sterilization lamp (9) to turn on, disinfecting the filter (32) in the cleaning box (12), and at the same time sends a timing signal to the clock to start timing; S3: The controller receives the clock timing signal and the sterilization time T1 After that, the timing is stopped and the controller controls the ultraviolet sterilization lamp (9) to turn off; S4: the controller controls the gate device (7) located between the return air box (11) and the cleaning box (12) to start, and the gate device (7) stops after the partition door (76) of the gate device (7) is fully raised, that is, the movement of the filter device (3) between the return air box (11) and the cleaning box (12) is not affected; S5: the controller controls the first driving mechanism (2) to start, and the first driving mechanism (2) drives the two sets of filter screen devices (3) to move synchronously in opposite directions until the relative positions of the two sets of filter screens (32) are interchanged, and then the first driving mechanism (2) stops, that is, the filter screen (32) originally located at the return air outlet (112) is located in the cleaning box (12), and the filter screen (32) originally located in the cleaning box (12) is located at the return air outlet (112); S6: The controller controls the gate device (7) to start, and the partition door (76) descends until it is completely closed, and then the gate device (7) stops, isolating the return air box (11) and the cleaning box (12) to prevent water in the cleaning box (12) from entering the return air box (11); S7: the controller controls the electromagnetic water valve (83) on the water pipe to open, and at the same time, controls the booster water pump (85) to start; the booster water pump (85) can boost the water pressure; S8: The controller sends a signal to the clock to start timing; at the same time, the controller controls the second drive mechanism (5) to start, and the second drive mechanism (5) drives the reciprocating motion device (4) located in the cleaning box (12) to perform reciprocating motion; and the controller controls the cleaning device (6) installed on the reciprocating motion device (4) to start, and the water from the booster water pump (85) cleans the filter (32); S9: The controller receives the clock signal to preset the cleaning time T2 , the controller controls the cleaning device (6) and the second driving device mechanism (5) to stop, cleaning is completed, and the reciprocating motion device (4) returns to its original position; S10: The controller controls the booster water pump (85) to stop and the electromagnetic water valve (83) on the water pipe to close. At the same time, the electromagnetic air valve (82) on the air pipe is opened and the blower (86) is started. The air from the blower (86) dries the filter (32) to prevent the filter (32) from being wet for a long time and rusting and breeding bacteria. S11: The controller receives the clock signal to preset the blowing time T3 After the clock stops timing, the controller controls the blower (86) to stop and controls the solenoid valve (82) to close; S12: Return to execute step S1.

2. The method for online intelligent cleaning of the return air vent filter of an air conditioner in a public building without stopping the machine according to claim 1 is characterized in that: The prerequisite for turning on the ultraviolet germicidal lamp (9) is: or, a specific date or cycle.

3. The method for online intelligent cleaning of the return air vent filter of an air conditioner in a public building without stopping the machine according to claim 1 is characterized in that: The water comes from condensed water collected in the water storage tank (15), and the air comes from the filtered return air in the return air box (11).

4. A cleaning device, based on the method for online cleaning of a filter screen of a return air outlet of an air conditioner in a public building without stopping the machine as claimed in claim 1, comprising a housing (1), characterized in that: It comprises a first power box (13) in which a first power mechanism (2) is installed, a second power box (14) in which a second power mechanism (5) is installed, a return air box (11) and a cleaning box (12) and a water storage tank (15) arranged between the first power box (13) and the second power box (14), and a gate device (7) is installed between the return air box (11) and the cleaning box (12); the return air box (11) has a return air port (112) on its bottom surface and an air conditioning connection port (111) on its side surface; it also comprises a water vapor supply device (8) and an ultraviolet sterilization lamp (9) installed on the top of the cleaning box (12); Two groups of identical filter devices (3) arranged up and down comprise two third screw rods (34), four third sliders (33) slidably threadedly sleeved on the third screw rods (34), a filter (32) connected to the third sliders (33), and a third bevel gear (31) fixed to the end of the third screw rod (34) and located in the first power box (13); one end of the third screw rod (34) is connected to the side wall of the first power box (13) via a bearing wheel, and the other end is connected to the side wall of the second power box (14) via a bearing wheel; the filter device (3) is driven by the first power mechanism (2); The reciprocating motion device (4) comprises two fourth screw rods (42), two fourth sliders (41) respectively slidably threadedly sleeved with the fourth screw rods (42), and a fourth bevel gear (43) fixed to the end of the fourth screw rod (42) and located in the second power box (14); the reciprocating motion device (4) is driven by the second power mechanism (5); The cleaning device (6) mounted on the reciprocating motion device (4) comprises a cleaning motor (61) and a roller brush (62). The cleaning motor (61) is mounted on one of the fourth sliders (41). One end of the roller brush (62) is fixed to the rotor of the cleaning motor (61), and the other end is connected to the other fourth slider (41) via a bearing wheel.

5. The cleaning device according to claim 4, characterized in that: The first power mechanism (2) comprises a first drive motor (21), two first connecting rods (25) arranged vertically, four first bevel gears (24) fixed to the first connecting rods (25), two pulleys (22) fixed to the first connecting rods (25), and a belt (23) connecting the two pulleys (22), wherein the directions of the two upper first bevel gears (24) and the two lower first bevel gears (24) are completely opposite, and the first bevel gears (24) mesh with the third bevel gears, one end of one of the first connecting rods (25) is fixed to the rotor of the first drive motor (21), and the other end is connected to the first power box (13) via a bearing wheel, and both ends of the other first connecting rod (25) are connected to the first power box (13) via a bearing wheel; The second power mechanism (5) comprises a second drive motor (51), a second connecting rod (53), and two second bevel gears (52) fixed to the second connecting rod (53); one end of the second connecting rod (53) is fixed to the rotor of the second drive motor (51), and the other end is connected to the side wall of the second power box via a bearing wheel; the second bevel gear (52) is meshingly connected to the fourth bevel gear (43).

6. The cleaning device according to claim 4, characterized in that: The water and air supply device (8) comprises a shower head (81) installed on the top of the cleaning box (12), an electromagnetic water valve (82) installed on the water pipe, an electromagnetic air valve (83) installed on the air pipe, a booster water pump (85), a hair dryer (86) and a three-way pipe (84); an air hole (113) is provided on the top of the return air box (11), a water outlet hole (153) is provided on the side of the water storage tank (15), and a pipe inlet hole (124) is provided on the top of the cleaning box (12); the inlet of the booster water pump (85) is connected to the water outlet hole (153) through a water pipe, and the outlet of the booster water pump is connected to the three-way pipe (84) through a water pipe; the inlet of the hair dryer (86) is connected to the air hole (113) through an air pipe, and the outlet is connected to the three-way pipe (84) through an air pipe; the other end of the three-way pipe (84) is connected to the shower head (81) through a pipeline passing through the pipe inlet hole (124).

7. The cleaning device according to claim 6, characterized in that: The top surface of the water tank (15) is provided with a condensation hole (151) for recovering condensed water from the air conditioner, the top of the side wall of the water tank (15) is provided with an overflow port (152), and the bottom surface of the cleaning box (12) is provided with a drain hole (121), and the overflow port (152) is connected to the drain hole (121) through a water pipe and then drains or vents water through a drain pipe.

8. The cleaning device according to claim 4, characterized in that: The gate device (7) comprises a gate motor (71), a fifth screw rod (72), a fifth slider (73), a connecting block (74), a mounting block (75) and a partition door (76). The cleaning box (12) has a fixing plate (123) and two ear door plates (122) on the side close to the return air box (11). The fixing plate (123) is fixed to the ear door plates (122). A guide groove (1231) is provided on the fixing plate (123). One end of the fifth screw rod (72) is fixed to the rotor of the gate motor (71), and the other end is rotatably connected to the mounting block (75). The fifth slider (73) is slidably threadedly sleeved with the fifth screw rod (72). One end of the connecting block (74) is fixed to the fifth slider (73), and the other end passes through the guide groove (1231) and is fixed to the partition door (76). When the partition door (76) is lowered to the lowest position, it can prevent water in the cleaning box (12) from entering the return air box (11).

9. The cleaning device according to claim 8, characterized in that: It also includes a waterproof cover (77) mounted on the fixing plate (123) at the gate device (7) to prevent water from passing through the guide groove (1231); the fourth screw rod (42) passes through the ear door plate (122), and two "U"-shaped holes (1221) are respectively provided on the sides of the two ear door plates (122); it also includes a waterproof shell (36) that wraps the third screw rod (34) and the third slider (33), the waterproof shell (36) is provided with a connecting groove (361), the third slider (33) is provided with a connecting strip (35), the connecting strip (35) passes through the connecting groove (361) and is fixed to the filter screen (32), and the size of the "U"-shaped hole (1221) is adapted to the third slider (33) and the filter screen (32).

10. The cleaning device according to claim 9, characterized in that: The waterproof shell (36) is located in the cleaning box (12) and has a water leakage groove (362) at the bottom.

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