A gravity-driven air cleaning device for urinal and a water-saving cleaning method thereof

Abstract

The invention discloses a gravity-driven air cleaning device for a urinal and a water-saving cleaning method thereof. The device comprises a urinal, an air storage bag, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a fogger and an air box; when a user stands on the air box, a gas compression device compresses the outside air entering the air box and transports it to the air storage bag during the descent process and triggers the switch to close, and the water inlet pipe of the urinal transports water to the urinal and the fogger through the first electromagnetic reversing valve, and the urinal is flushed and lubricated under the control of a time delay relay; when the user leaves the air box, the switch is disconnected, and the charging state of the capacitor is changed to the discharging state, so that the compressed air in the air storage bag enters the fogger through the second electromagnetic reversing valve, and the fogger outputs an airflow carrying water mist to flush the urinal. The invention utilizes the gravitational potential energy of the human body to convert the outside air into a high-speed airflow, and carries water mist to flush the urinal, which not only meets the cleaning requirements but also avoids the waste of water resources.

Description

Technical Field

[0001] The invention belongs to the technical field of water saving and relates to a gravity-driven air-cleaning urinal. Background Art

[0002] With the increase in population and the intensification of environmental pollution, how to effectively protect water resources and save water is a problem that countries around the world, especially those with severe water shortages, need to actively solve. For countries with severe water shortages, with the increase in urban public health facilities, the amount of water required for flushing has increased significantly. At present, infrared sensing urinals are commonly used in public health facilities. Such urinals can automatically start cleaning by sensing their own occupancy. However, since the cleaning method uses water flow flushing, in order to ensure the cleaning effect, the delay time after the flushing is triggered by induction is relatively long, and the use of infrared sensing control is prone to the problem of mistaken cleaning of the urinal (for example, non-toilet personnel accidentally pass by the urinal to trigger flushing), resulting in large water consumption and waste of water resources. Based on this, how to eliminate unnecessary cleaning, reduce the amount of water used for cleaning, and meet the requirements of cleaning hygiene is a problem that needs to be solved urgently. Summary of the invention

[0003] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a urinal gravity-driven air cleaning device and a water-saving cleaning method thereof.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A gravity-driven air cleaning device for a urinal comprises a urinal, an air storage bag, a power control circuit, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a fogger and an air box located at the front side of the urinal; the air box comprises a liftable pedal and a gas compression device connected to the pedal, the air inlet end of the gas compression device is connected to the outside atmosphere through a one-way valve, and the air exhaust end of the gas compression device is connected to the air storage bag; the power control circuit comprises a circuit composed of a power supply, a capacitor and a switch coupled to the lifting action of the pedal, the first electromagnetic reversing valve and the second electromagnetic reversing valve are respectively connected in parallel with the capacitor, a time delay relay is arranged on the parallel branch where the first electromagnetic reversing valve is located, and an inductor is arranged on the parallel branch where the second electromagnetic reversing valve is located; the first electromagnetic reversing valve is respectively connected to the water inlet pipe of the urinal, the cleaning water passage of the urinal and the inlet of the fogger, the second electromagnetic reversing valve is respectively connected to the air storage bag and the inlet of the fogger, and the outlet of the fogger is connected to the cleaning water passage of the urinal.

[0006] Preferably, the mist generator is selected from an internal mixing air atomizing nozzle.

[0007] Preferably, the air box further comprises a bottom plate and a slide rail, the slide rail is arranged on the bottom plate, the pedal is arranged on the slide rail, and the retractable part of the gas compression device is respectively connected to the bottom plate and the pedal.

[0008] Preferably, the slide rail is columnar, the upper end of the slide rail passes through the pedal, and the slide rail is provided with springs respectively connected to the pedal and the base plate.

[0009] Preferably, an electronic display screen is provided above the urinal.

[0010] Preferably, a weight monitoring sensor is provided on the air box (for example, on the pedal).

[0011] Preferably, the inductance of the inductor is 100-150 μH, and the capacitance of the capacitor is 320-400 μF.

[0012] The water-saving cleaning method of the urinal gravity-driven air cleaning device comprises the following steps:

[0013] 1) The user stands on the air box and lowers the pedal. During the lowering of the pedal, the gas compression device compresses the outside air entering the air box and transmits it to the air storage bag. When the pedal is lowered to trigger the switch to close, the water inlet pipe of the urinal transmits the cleaning water to the cleaning water passage of the urinal and the fogger through the first electromagnetic reversing valve, and the urinal is flushed and lubricated for a corresponding time under the control of the delay relay;

[0014] 2) After the user leaves the air box, the pedal begins to rise and causes the switch to be disconnected. At the same time, the capacitor changes from a charged state when the switch is closed to a discharged state, so that the compressed air in the air storage bag enters the fogger through the second electromagnetic reversing valve, and the fogger outputs an airflow carrying water mist to flush the urinal.

[0015] Preferably, the flushing and lubrication time controlled by the time delay relay is ≤2s, and the flow rate of the water inlet pipe of the urinal is 50-80mL / s.

[0016] Preferably, the air inlet pressure of the atomizer is >0.5MPa.

[0017] The beneficial effects of the present invention are embodied in:

[0018] The present invention utilizes the continuous stepping action of the user on the air box when sitting in front of the urinal to trigger the cleaning program of the urinal, utilizes the gravitational potential energy of the human body to convert the external air into high-speed airflow, and carries water mist to automatically flush the urinal, which can avoid the waste of water resources caused by unnecessary flushing, and can meet the cleaning requirements with a lower amount of water, thereby reducing the consumption of water resources for urinal cleaning, significantly improving the utilization rate of water resources, and being economical, environmentally friendly, and reliable, and has a wide range of application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a gravity-driven air-cleaning urinal in an embodiment of the present invention;

[0020] Figure 2 A cleaning control circuit and piping schematic diagram of a gravity-driven air-cleaning urinal in an embodiment of the present invention;

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the middle air box;

[0022] Figure 4 This is a schematic diagram of the structure of an internal mixing air atomizing nozzle;

[0023] In the figure: 1-switch, 2-air box, 3-sequence valve, 4-air bag, 5-first electromagnetic reversing valve, 6-second electromagnetic reversing valve, 7-fogger, 8-inductor, 9-capacitor, 10-power supply, 11-urinal, 12-delay relay, 13-electronic display screen, 14-intake pipe, 15-down pipe, 16-bottom plate, 17-spring, 18-slide rail, 19-pedal, 20-contact, 21-gas compression device, 22-fixed frame, 23-air inlet, 24-water inlet, 25-mixing chamber, 26-water inlet pipe. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] (I) Introduction to the function of the urinal gravity-driven air cleaning device module

[0026] See also Figure 1 The present invention sets an air box 2 at the user's standing position in front of the urinal 11, and the user steps on the air box 2 to start the automatic cleaning process of the urinal 11. The specific functions are as follows:

[0027] ① Gravity-driven part: When the user steps on the upper part of the air box 2, the change of the gravitational potential energy of the human body is used to compress the air in the air box 2 and store it in the air inlet pipe 14 whose end extends to the rear side of the urinal 11, so that the mist generator 7 can generate a high-speed airflow carrying water mist to flush the urinal 11. One of the characteristics of the present invention is that the combination of airflow and water mist is used to achieve the cleaning effect, saving water resources to the greatest extent.

[0028] ② Circuit control part: The opening and closing of the switch 1 on the air box is used to control the opening and closing of the two-way electromagnetic reversing valve, thereby completing the cleaning procedures of flushing and lubricating the urinal 11 with water flow before use and flushing with water mist carried by high-speed air flow after use (the urinal 11 uses a downpipe 15 connected to its bottom for drainage).

[0029] ③ Weighing part: A weight monitoring sensor can be attached to the air box 2 where the user stands.

[0030] ④ Playing and displaying part: The LED electronic display screen 13 installed above the urinal 11 can not only display the weight of the user, but also play text, pictures and other contents. For example, short advertisements can be played during the time when people are using the toilet, and necessary safety instructions and reminders for using the urinal 11 can also be displayed. The LED electronic display screen 13 can be centrally controlled by the management personnel, which is convenient for management.

[0031] (II) Cleaning control circuit and pipeline structure of urinal gravity-driven air cleaning device

[0032] See also Figure 2 The cleaning control circuit includes a first electromagnetic reversing valve 5, a second electromagnetic reversing valve 6, an inductor 8, a capacitor 9, a power supply 10 and a time delay relay 12. The switch 1, the power supply 10 and the capacitor (320μF) 9 form a main power control circuit. The first electromagnetic reversing valve 5 is connected in parallel on both sides of the capacitor 9 to form a control branch. The second electromagnetic reversing valve 6 is connected in parallel on both sides of the capacitor 9 to form another control branch. The time delay relay 12 is connected in the control branch where the first electromagnetic reversing valve 5 is located. The inductor (100μH) 8 is connected in the control branch where the second electromagnetic reversing valve 6 is located.

[0033] The water inlet pipe 26 of the urinal 11 is connected to the first electromagnetic reversing valve 5 ; the air inlet pipe 14 is provided with a sequence valve 3 , and the air inlet pipe 3 is provided with an air bag 4 connected to the sequence valve 3 , and the air bag 4 is connected to the second electromagnetic reversing valve 6 .

[0034] The first electromagnetic reversing valve 5, the second electromagnetic reversing valve 6, the inductor 8, the capacitor 9, the power supply 10, the delay relay 12 and the fogger 7 are all installed on the rear side of the urinal 11. The fogger 7 is respectively connected to the first electromagnetic reversing valve 5, the second electromagnetic reversing valve 6 and the cleaning water passage of the urinal 11. The first electromagnetic reversing valve 5 is also connected to the cleaning water passage of the urinal 11 through a bypass parallel to the fogger 7.

[0035] When the user steps on the air box 2 and causes the switch 1 to close, the power control main circuit is in the passage state. At this time, the delay relay 12 and the first electromagnetic valve 5 can be used to control the water outlet time of the water inlet pipe 26 (when the switch 1 is closed, the delay relay 12 is closed instantly, the first electromagnetic reversing valve 5 works, and the water inlet pipe 26 starts to drain. After the water outflow from the water inlet pipe 26 passes through the first electromagnetic reversing valve 5, part of it enters the cleaning water passage of the urinal 11, and the other part enters the fogger 7. The delay relay 12 is disconnected according to the set time, the first electromagnetic reversing valve 5 no longer works, and the water inlet pipe 26 stops draining); when the switch 1 is closed, the second electromagnetic reversing valve 6 does not work due to the presence of the inductor 8, and the power supply 10 (which can use alternating current) only charges the capacitor 9. When the user leaves the air box 2 and the switch 1 is disconnected, the capacitor 9 starts to discharge, the current passes through the inductor 8 to reach the second electromagnetic reversing valve 6, the second electromagnetic reversing valve 6 works, the compressed air in the air bag 4 enters the mist generator 7, the mist generator 7 outputs a high-speed airflow carrying water mist into the cleaning water passage of the urinal 11, until the capacitor 9 stops discharging and the second electromagnetic reversing valve 6 stops working.

[0036] The water inlet of the cleaning water passage of the urinal 11 is located at the rear side of the urinal 11, and the water outlet is evenly arranged above the inner wall of the urinal 11. According to different arrangements of the cleaning water passage, one or more mist generators 7 can be selected.

[0037] (III) Structure of air box and fogger

[0038] See also Figure 3 The air box 2 includes a bottom plate 16, four cylindrical slide rails 18, a pedal 19, four light springs 17, and a gas compression device 21. The gas compression device 21 is made of a retractable hose and is located between the pedal 19 and the bottom plate 16. The upper and lower ends are bonded to the pedal 19 and the bottom plate 16 to ensure that there is no leakage at these two bonding locations to ensure air tightness. An air guide pipe (i.e. Figure 1The air intake pipe 14 in the bottom of the gas compression device 21). A one-way valve is also connected to the side of the gas compression device 21 to ensure that the gas can only enter the gas compression device 21 from the outside, but cannot enter the outside atmosphere from the inside of the gas compression device 21. Four cylindrical slide rails 18 are installed and fixed at the four corners of the bottom plate 16. A light spring 17 is sleeved on each cylindrical slide rail 18 to stably support the pedal 19 above the bottom plate 16. Each cylindrical slide rail 18 penetrates the pedal 19 and is connected to a fixing frame 22 located above the pedal 19. The moving contact and the static contact of the switch 1 are arranged on the pedal 19 and the bottom plate 16 respectively (each contact is connected to a wire, and the wire extends to the back side of the urinal 11, and the arrangement position is, for example, located at Figure 3 20 as shown in FIG.

[0039] When the user stands on the air box 2, the pedal 19 drops due to the pressure exerted by the human body (close to the bottom plate 16), the spring 17 is compressed, and the gas is also compressed. After compression, the gas enters the air bag 4 through the sequence valve 3. At this time, the compression amount of the gas compression device 21 reaches three-quarters of the normal state, and the switch 1 is closed due to the contact between the moving and static contacts on the pedal 19 and the bottom plate 16. When the person leaves the air box 2, the pedal 19 returns to the initial position due to the elastic force of the spring 17 (the gas compression device 21 returns to the normal state), the switch 1 is disconnected due to the separation of the moving and static contacts, and the gas compression device 21 replenishes gas (external air) through the one-way valve on its side.

[0040] The function of the mist generator 7 is to atomize the previously stored water and mix it with the high-speed airflow to form a high-speed airflow carrying water mist for flushing the inner wall of the urinal. To this end, the mist generator 7 can be implemented by an internal mixing air atomizing nozzle (referred to as a nozzle). Figure 4As shown, the top of the internal mixing air atomizing nozzle has a water-gas mixing inlet (including a water inlet 24 and an air inlet 23), and the bottom has a mixing chamber 25. The mixing chamber 25 is provided with circular holes in the radial direction as high-speed airflow and water mist outlets (water-gas internal outlets). The outer side of the mixing chamber 25 is connected to a top cover by threads, and the circular hole on the end face of the top cover is a water-gas mixing outlet (water-gas external outlet). The internal water storage device of the internal mixing air atomizing nozzle has a pressure sensing sensor. Once the inflow of high-pressure airflow (for example, compressed air in an airbag) is sensed to cause the nozzle pressure value to increase, the internal water storage device will release the stored water, allowing it to mix with the high-pressure airflow and hit the front wall for initial atomization. When the gas and liquid are mixed, the gas-liquid passage angle is designed to be 20°. This angle corresponds to the largest atomization cone angle, the smallest average droplet Sotel diameter, and the best atomization effect. After impact atomization inside the nozzle, the liquid and gas make the first energy exchange in the mixing chamber 25, the gas pressure is reduced, the potential energy inside is converted into the kinetic energy of the gas-liquid mixed flow and the surface energy of the liquid, and it impacts the inner wall of the nozzle top cover for re-atomization, which can be increased through a two-way inclined groove (located on a disk opposite to the end face of the top cover, the disk is located at the bottom of the mixing chamber 25, the edge of the disk has an annular retaining wall, two inclined grooves extend outward from the non-center of the disk and pass through one side of the annular retaining wall, and one of the inclined grooves has an opening on the annular retaining wall in the same direction as the radial circular hole of the mixing chamber 25, and the other inclined groove has an opening on the annular retaining wall in the opposite direction to the radial circular hole of the mixing chamber 25) to increase the flow rate and expand the spray range, and spray out from the water-gas mixing outlet on the top cover (secondary injection). In the secondary injection, the gas-liquid mixed flow comes into contact with the outside air, and the bubbles in the mixed flow further expand and rupture, causing the liquid to break into droplets and increasing the overall flow velocity of the mixed flow. The collision with the air further breaks the droplets into small droplets, and the liquid surface energy is further increased, which is conducive to cleaning a larger area of ​​the urinal inner wall, resulting in a better flushing effect.

[0041] The air inlet pressure and water inlet pressure of the nozzle are the key factors affecting the particle size of the atomized droplets. Within the spray stability range, the greater the air pressure, the smaller the average diameter of the droplets, and the greater the water pressure, the larger the average diameter of the droplets. When the air pressure exceeds 0.5Mpa, the average diameter of the droplets remains within a certain range and is not affected by the changes in lower water pressure. Therefore, when the water in the water storage device inside the nozzle is mixed with the high-pressure airflow by its own weight, the atomization effect will not be affected by its low water pressure.

[0042] References:

[0043] [1] Zhang Kui, Liu Ronghua, Wang Pengfei, Wang Jian, Shi Yijie, Pei Ye. "The influence of internal flow conditions of internal mixing air atomizing nozzle on spray effect". Mining Technology.

[0044] [2] Guo Jingpu, An Shijie, Liu Zhenming, Wang Xiaochuan, Chen Jiahao. Experimental study on spray performance of internal mixing air atomizing nozzle. Journal of Wuhan University of Technology.

[0045] [3] Wu Enqi, Gu Ziming, Zhao Bing, Xu Zhibao. “Design and experimental study of air atomizing nozzle”. Thermal Power Engineering.

[0046] (IV) Water-saving cleaning principle of urinal gravity-driven air cleaning device

[0047] When the user approaches the urinal 11 and stands on the air box 2, the pedal 19 of the air box 2 descends, compressing the air in the air box 2 into high-pressure gas, and using the gravitational potential energy of the human body to obtain air potential energy. The high-pressure gas passes through the sequence valve 3 (to ensure that the gas only enters the air bag and does not flow back) and enters the air bag 4 for storage. When the switch 1 is closed, the delay relay 12 is opened, the first electromagnetic reversing valve 5 works, and the water inlet pipe 26 starts to drain. The delay relay 12 is disconnected after working for two seconds, and the water inlet pipe 26 stops draining. During this period, part of the water discharged from the drainage pipe plays a role in lubricating the wall of the urinal 11, and the other part enters the mist generator 7, which is the amount of atomized water required for air cleaning.

[0048] When the user leaves the urinal 11 and no longer stands on the air box 2, the pedal 19 of the air box 2 rises, and the outside air is sucked into the gas compression device 21 to prepare for the next use of the urinal, that is, as the gas to be compressed. When the switch 1 is disconnected, the capacitor 9 starts to discharge, and the second electromagnetic reversing valve 6 works, so that the air bag 4 connected thereto can send the high-pressure gas to the mist generator 7 along the connecting pipeline, forming a high-speed airflow carrying water mist to flush the pool wall of the urinal 11.

[0049] (V) Urinal cleaning process of urinal gravity driven air cleaning device

[0050] 1) When the user stands on the air box 2 (to close the switch 1), the urinal 11 wall is flushed and lubricated. The air box 2 converts the gravitational potential energy of the human body into the air potential energy of high-pressure gas. After the gas is compressed, it passes through the sequence valve 3 and enters the air bag 4 for storage;

[0051] 2) After the user leaves, the high-speed airflow carrying water mist starts to flush the pool wall of the urinal 11 and stops automatically.

[0052] (VI) Effect verification

[0053] 1) Theoretical calculation of pressure

[0054] Gas compression device: diameter D = 0.25m, height H = 0.2m; height after compression: h = 0.05m

[0055] Compressed gas volume: V1 = ∏ × (D / 2) 2×(Hh)=0.00736m 3

[0056] The volume of the airbag is: V2 = 0.3L = 0.0003m 3

[0057] According to the Clapeyron equation: PV = nRT, and the gas pressure in the gas compression device: P1 = 1.01 × 10 5 pa, assuming the air pressure in the airbag is P2, then P1V1=P2V2, we get

[0058] P2=2.48×10 7 pa=24.78Mpa

[0059] 2) Calculation and verification of water-saving effect

[0060] Because the delay relay 12 can accurately control the opening and closing time of the first electromagnetic reversing valve 5 (the opening time is 2 seconds, and the flow rate of the water inlet pipe is controlled to be 50 mL / s), the cleaning water consumption is 100 mL, that is, the theoretical water consumption is 100 mL.

[0061] Through investigation and reference, the average water consumption of existing infrared induction flushing urinals is 800-1500 mL per cleaning. Taking into account the error and other factors, it can be calculated from this data that the water saving of the present invention is about 80%-90%.

[0062] The theoretical air pressure value of the airbag can be obtained from the above data, which is sufficient to meet the high-pressure water-gas mixed air pressure value requirements of the nozzle and the cleaning requirements of the urinal (100mL).

[0063] (VII) Advantages of urinal gravity-driven air cleaning device

[0064] (1) High efficiency and water saving: The present invention adopts a method of converting gravitational potential energy into air potential energy. The high-speed airflow carrying water mist obtained by the above method is used for urinal cleaning, which can save 80% to 90% of water.

[0065] (2) Reliability: The present invention adopts gravity drive, that is, cleaning will only start when a person stands on the air box, which overcomes the problem of accidental flushing of water in the existing infrared sensing technology.

[0066] (3) Easy to clean: In the present invention, the air box is located close to the urinal, and the LED electronic display screen prompts the correct way to put it in place (that is, you will feel it drop when it is in place). The fixing frame also has a prompting function for the position, which greatly avoids the phenomenon of people not getting close to the urinal when urinating and staining the ground.

[0067] (4) Clean and hygienic: The present invention utilizes a high-speed airflow carrying water mist to flush the inner wall of the urinal, which can ensure that the wall of the urinal is cleaned in all directions without dead angles, thereby ensuring that the urinal is clean and hygienic.

[0068] (5) Convenience: The user only needs to stand on the air box, and the urinal will automatically clean after leaving, without the need for human to operate buttons.

[0069] (6) Rich functions: The LED display screen can not only be used to display the user's weight (based on the data detected by the weight monitoring sensor attached to the gas box), but also play some text or picture content (such as advertisements, etc.), using the time when people go to the toilet for short-term publicity, bringing certain additional income to public health facilities, and can also provide users with more abundant information when they go to the toilet, promote users to go to the toilet in a civilized manner, and enable public health facilities to achieve better sanitary conditions.

Claims

1. A gravity-driven air cleaning device for a urinal, characterized in that: The invention comprises a urinal (11), a drain pipe (15) connected to the urinal (11), an air storage bag (4), a power control circuit, a first electromagnetic reversing valve (5), a second electromagnetic reversing valve (6), a fogger (7), and an air box (2) located at the front side of the urinal (11); the air box (2) comprises a liftable pedal (19) and a gas compression device (21) connected to the pedal (19); the air inlet end of the gas compression device (21) is connected to the outside atmosphere through a one-way valve, and the air outlet end of the gas compression device (21) is connected to the air storage bag (4); the power control circuit comprises a power supply (10), a capacitor (9), and a liftable pedal (19) connected to the pedal (19); The invention discloses a circuit composed of a switch (1) coupled with a lowering action, wherein a first electromagnetic reversing valve (5) and a second electromagnetic reversing valve (6) are respectively connected in parallel with a capacitor (9), a time delay relay (12) is arranged on the parallel branch where the first electromagnetic reversing valve (5) is located, and an inductor (8) is arranged on the parallel branch where the second electromagnetic reversing valve (6) is located; the first electromagnetic reversing valve (5) is respectively connected to a water inlet pipe of a urinal (11), a cleaning water passage of the urinal (11) and an inlet of a fogger (7), the second electromagnetic reversing valve (6) is respectively connected to an air storage bag (4) and an inlet of a fogger (7), and an outlet of the fogger (7) is connected to the cleaning water passage of the urinal (11).

2. A urinal gravity-driven air cleaning device according to claim 1, characterized in that: The mist generator (7) is selected from an internal mixing air atomizing nozzle.

3. The urinal gravity-driven air cleaning device according to claim 1, characterized in that: The gas box (2) further comprises a bottom plate (16) and a slide rail (18), wherein the slide rail (18) is arranged on the bottom plate (16), the pedal (19) is arranged on the slide rail (18), and the retractable part of the gas compression device (21) is respectively connected to the bottom plate (16) and the pedal (19).

4. The urinal gravity-driven air cleaning device according to claim 3, characterized in that: The slide rail (18) is columnar, the upper end of the slide rail (18) passes through the pedal (19), and a spring (17) connected to the pedal (19) and the bottom plate (16) is arranged on the slide rail (18).

5. The urinal gravity-driven air cleaning device according to claim 1, characterized in that: An electronic display screen (13) is arranged above the urinal (11).

6. The urinal gravity-driven air cleaning device according to claim 1, characterized in that: The air box (2) is provided with a weight monitoring sensor.

7. The urinal gravity-driven air cleaning device according to claim 1, characterized in that: The inductance of the inductor (8) is 100-150 μH, and the capacitance of the capacitor (9) is 320-400 μF.

8. A cleaning method for a urinal gravity-driven air cleaning device as claimed in claim 1, characterized in that: The following steps are involved: 1) The user stands on the air box (2) and lowers the pedal (19). During the lowering process of the pedal (19), the gas compression device (21) compresses the outside air entering the air box (2) and transmits it to the air storage bag (4). When the pedal (19) is lowered until the trigger switch (1) is closed, the water inlet pipe of the urinal (11) transmits the cleaning water to the cleaning water passage and the mist generator (7) of the urinal (11) through the first electromagnetic reversing valve (5), and the urinal (11) is flushed and lubricated for a corresponding time under the control of the delay relay (12); 2) After the user leaves the air box (2), the pedal (19) begins to rise and causes the switch (1) to be disconnected. At the same time, the capacitor (9) changes from a charged state when the switch (1) is closed to a discharged state, so that the compressed air in the air storage bag (4) enters the mist generator (7) through the second electromagnetic reversing valve (6), and the mist generator (7) outputs an air flow carrying water mist to flush the urinal (11).

9. The cleaning method according to claim 8, characterized in that: The flushing and lubrication time controlled by the time delay relay (12) is ≤2s, and the flow rate of the water inlet pipe of the urinal (11) is 50-80mL / s.

10. The cleaning method according to claim 8, characterized in that: The air inlet pressure of the mist generator (7) is >0.5 MPa.

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