CN211284004U

CN211284004U - Ultraviolet photocatalysis copper-silver ion disinfection purifier for swimming pool

Info

Publication number: CN211284004U
Application number: CN201920920537.8U
Authority: CN
Inventors: 黄红锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2020-08-18
Anticipated expiration: 2029-06-18

Abstract

The utility model discloses a swimming pool ultraviolet photocatalysis copper silver ion disinfection clarifier belongs to the swimming pool field of handling, including the box that has inlet tube and outlet pipe, be equipped with filter unit, copper silver ion generating unit and ultraviolet purification unit in the box, be copper silver ion generating unit, filter unit and ultraviolet purification unit from inlet tube to outlet pipe in proper order. This swimming pool ultraviolet photocatalysis copper silver ion disinfection clean system has purification efficiency height, and is little to environment and human harm, the sterile advantage of continuation.

Description

Ultraviolet photocatalysis copper-silver ion disinfection purifier for swimming pool

Technical Field

The utility model relates to a technical field that the swimming pool was handled especially relates to a swimming pool ultraviolet ray photocatalysis copper silver ion disinfection clarifier.

Background

Currently, most swimming pools are disinfected with chlorine. Chlorine disinfection is economical and convenient, the effect is reliable, chlorine dissolved in water has continuous sterilization capability, but the chlorine is toxic, and the greatest problem of chlorine disinfection is that after the chlorine is administrated, the air around the swimming pool is often smelly by unpleasant chlorine; in residential communities, residential complaints are often incurred when community pools are open. The concentration of chlorine in the air of the indoor swimming pool of the five-star hotel is higher, so that people feel dizzy during swimming; the chlorine concentration in the air of the chlorine dosing room is usually high and is harmful to the health of workers; chlorine is a toxic substance, and is troublesome to store and transport; chlorine disinfection also produces secondary pollution, and chlorine-containing substances in the disinfection discharge water are mostly toxic and partially sudden.

As a physical disinfection method, the ultraviolet disinfection is completely free of disinfection byproducts, free of secondary pollution, safe and reliable. High disinfecting efficiency, broad-spectrum sterilization, and no influence of water temperature, PH and the like. Particularly has obvious inactivation efficiency on cryptosporidium and giardia eggs with chlorine resistance. However, the biggest defect of ultraviolet disinfection is that the continuous disinfection capability is not available, which may cause the breeding of water body bacteria in the swimming pool and destroy the disinfection effect.

Various swimming pool purifiers appear on the market at present, but the purification efficiency is not very high, the swimming pool purifiers have great harm to the environment and human bodies, and the disinfection durability is not very good.

Disclosure of Invention

Not enough to prior art exists, the utility model aims to provide a swimming pool ultraviolet ray photocatalysis copper silver ion disinfection clarifier, this swimming pool ultraviolet ray photocatalysis copper silver ion disinfection clean system have purification efficiency height, and is little to environment and human harm, the sterile advantage of continuation.

The above object of the present invention is achieved by the following technical solutions: the utility model provides a swimming pool ultraviolet photocatalysis copper silver ion disinfection clarifier, is including the box that has inlet tube and outlet pipe, be equipped with filter unit, copper silver ion generating element and ultraviolet purification unit in the box, be copper silver ion generating element, filter unit and ultraviolet purification unit from inlet tube to outlet pipe in proper order, still be provided with ozone generating element in the box.

By adopting the technical scheme, water in the swimming pool enters from the water inlet pipe, the copper silver ion generating unit generates copper silver ions, the copper silver ions have the flocculation effect and are combined with micro particles in the water to become large particles, the large particles can be filtered when passing through the filtering unit, the filtering effect is better, so that the water transparency can be improved, the disinfection efficiency of the ultraviolet purification unit is high, the cleaner water purification effect can be better when passing through the ultraviolet purification unit later, the generated copper silver ions can be combined with bacterial cells, the copper silver ions penetrate through cell walls and are combined with DNA and RNA at specific parts in the cells, protease and respiratory enzyme of the bacterial cells are damaged, the bacterial cells are dissolved and dead, the continuous disinfection and sterilization effect is realized, and the ozone generated by the ozone generating unit can damage the structure of a microbial membrane by the oxidation effect of oxygen atoms, in order to realize bactericidal action, further improve entire system's bactericidal effect, can obviously reduce the quantity of copper silver ion disinfectant after copper silver ion combines with the ultraviolet ray, on the one hand copper silver ion hydrate can become copper silver ion again under the effect of ultraviolet ray and enter into the aquatic, on the other hand can restrain the growth of aquatic biomass under the effect of ultraviolet ray, thereby also can reduce the consumption of copper silver ion, entire clean system has the purification efficiency height, it is little to environment and human harm, the advantage of persistent disinfection and sterilization.

The utility model discloses further set up to: the ultraviolet purification unit comprises an ultraviolet lamp and a titanium dioxide photocatalytic ceramic plate.

By adopting the technical scheme, the titanium dioxide photocatalytic plate in water can change water molecules into hydroxyl radicals after ultraviolet irradiation, the hydroxyl radicals are strong oxidants and can sterilize and kill algae, more importantly, the titanium dioxide photocatalytic plate can oxidize organic pollutants in water into carbon dioxide and water, and the purification effect is further improved.

The utility model discloses further set up to: be equipped with purification storehouse and reservoir in the box, purify the storehouse upper end and communicate each other with the inlet tube, purify the bottom in storehouse and reservoir and communicate each other, the upper end and the outlet pipe intercommunication in reservoir, the height that highly is less than reservoir of outlet pipe, ultraviolet purification unit sets up in purifying the storehouse, and ultraviolet purification unit is still including the gondola water faucet board that has a plurality of through-holes, the gondola water faucet board is located the top of titanium dioxide photocatalysis ceramic plate, titanium dioxide photocatalysis ceramic plate is located ultraviolet lamp's top, the height that highly is greater than reservoir of gondola water faucet board.

Through adopting above-mentioned technical scheme, in getting the box with swimming pool water through the water pump, swimming pool water forms after through the gondola water faucet board and falls the surface of water that purifies the storehouse like the gondola water faucet water spray on, makes swimming pool water and the abundant contact of air improve aquatic oxygen content, also does benefit to giving off of harmful gas in the swimming pool aquatic simultaneously, and the oxygen content of aquatic is higher, and ultraviolet ray and titanium dioxide photocatalysis ceramic plate's deactivation efficiency is higher.

The utility model discloses further set up to: the ozone generation unit is arranged between the water outlet and the water storage bin and comprises an ultraviolet lamp and a photocatalytic plate, the photocatalytic plate is arranged above the ultraviolet lamp, and the ultraviolet lamp is arranged above the water outlet pipe.

By adopting the technical scheme, the ultraviolet lamp is arranged above the water outlet pipe and can be exposed in the air, ultraviolet light irradiates the air, oxygen molecules in the air can generate ozone and atomic oxygen after absorbing ultraviolet light with the wavelength of 185nm, and the generated ozone can be absorbed into the water outlet pipe and can be better mixed with water.

The utility model discloses further set up to: a water distribution plate with a plurality of through holes is arranged above the photocatalytic plate, and the height of the water distribution plate is lower than that of the water storage bin.

Through adopting above-mentioned technical scheme, swimming pool water forms behind the gondola water faucet board and falls on the surface of water below like the gondola water faucet water spray, makes the hydroxyl free radical that ozone and photocatalysis board produced can mix swimming pool aquatic better, and the ultraviolet ray also can contact with swimming pool water better.

The utility model discloses further set up to: and an air inlet is formed in the side wall of the box body.

By adopting the technical scheme, more air can enter to react with ultraviolet rays to improve the content of ozone.

The utility model discloses further set up to: the box is the cask type, the filter unit is the filter screen of tubbiness, the ultraviolet purification unit sets up in the filter screen, the inlet tube passes through the filter screen with the outlet pipe and separates, the inlet tube sets up in filter screen open-ended below, the outlet pipe sets up in filter screen open-ended top.

Through adopting above-mentioned technical scheme, the filter screen of tubbiness has increased the area of contact with swimming pool water, improves the filter effect.

The utility model discloses further set up to: the bottom of box is provided with the drain, drain department is equipped with the valve.

By adopting the technical scheme, the filter screen is made of stainless steel and has a smooth surface, and because copper and silver ions are used for disinfection, no biological film grows, and impurities can be directly discharged from the sewage draining outlet without special cleaning when the valve is opened.

The utility model discloses further set up to: the inner barrel is arranged in the filter screen, the ultraviolet purification unit is arranged in the inner barrel, and water-collecting plates are arranged on the inner wall of the inner barrel around the ultraviolet purification unit.

By adopting the technical scheme, the low-pressure high-power ultraviolet lamp is adopted, the ultraviolet intensity on the surface of the lamp tube reaches 50000 mu w/cm2, and in order to improve the inactivation rate, when water flows through the ultraviolet lamp, the water collecting plate is added to ensure that the water can be collected to the vicinity of the surface of the lamp tube to flow through. CFD (computational fluid dynamics) simulation shows that the design can greatly improve the proportion of high-strength dosage, and the inactivation rate can be improved by 0.2-0.4 log.

To sum up, the utility model discloses a beneficial technological effect does:

1. at first become the large granule through the granule flocculation of copper silver ion to swimming pool aquatic, filter it through the filter unit and make swimming pool water become more transparent, the disinfection of disinfecting of rethread ultraviolet purification unit, follow-up copper silver ion also can continuously disinfect the disinfection to swimming pool water, entire system has the purification efficiency height, and is little to environment and human harm, the sterile advantage of continuation.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a perspective view of an ultraviolet purification unit according to a first embodiment of the present invention.

Fig. 3 is a perspective view of the titanium dioxide photocatalytic ceramic plate of fig. 3 with the plate removed.

Fig. 4 is a perspective view of a shower plate according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a second embodiment of the present invention.

In the figure, 1, a box body; 2. a water inlet pipe; 3. a water outlet pipe; 4. a filtration unit; 41. a filter screen; 5. a copper-silver ion generating unit; 6. an ultraviolet purification unit; 61. an ultraviolet lamp; 62. a titanium dioxide photocatalytic ceramic plate; 7. a purifying bin; 8. a water storage bin; 9. a shower plate; 10. an ozone generating unit; 101. an ultraviolet lamp; 102. a photocatalytic plate; 11. a water distribution plate; 12. an air inlet; 13. a sewage draining outlet; 14. a valve; 15. a water trap plate; 16. an inner barrel; 17. hooking; 18. a drainage groove; 19. a through hole; 20. a pointed protrusion; 21. a frame body; 22. a through groove; 23. and (4) sliding grooves.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Example one

Referring to fig. 1, for the utility model discloses a swimming pool ultraviolet photocatalysis copper silver ion disinfection purifier, which comprises a box body 1, a water inlet pipe 2 is communicated with the left side of the box body 1, a water pump is connected with the water inlet pipe 2, a water outlet pipe 3 is communicated with the right side of the box body 1, four partition boards are arranged in the box body 1, five chambers are formed after the four partition boards are arranged in the box body 1, a copper silver ion generating unit 5, a filtering unit 4, a purifying chamber 7, a water storage chamber 8 and an ozone generating unit 10 are respectively arranged from the leftmost chamber to the rightmost chamber, the copper silver ion generating unit 5 is communicated with the bottoms of the two chambers of the filtering unit 4, the filtering unit 4 is communicated with the tops of the two chambers of the purifying chamber 7, the bottoms of the two chambers of the purifying chamber 7 and the water storage chamber 8 are communicated, the tops of the two chambers of the water storage chamber 8 and the ozone generating unit 10, two ultraviolet purification units 6 which are overlapped together are arranged in the purification bin 7, each ultraviolet purification unit 6 comprises an ultraviolet lamp 61 and a titanium dioxide photocatalytic ceramic plate 62 which is arranged above the ultraviolet lamp 61, the titanium dioxide photocatalytic ceramic plate 62 is formed by spraying a layer of nano titanium dioxide on the surface of the ceramic plate and is bonded on the ceramic plate after high-temperature roasting, the height of the water storage bin 8 is higher than that of the titanium dioxide photocatalytic ceramic plate 62, so that the ultraviolet lamp 61 and the ceramic plate arranged at the ultraviolet lamp 61 are both positioned in water, a shower plate 9 with a plurality of through holes 19 is also arranged above the titanium dioxide photocatalytic ceramic plate 62, the water overflowing to the swimming pool of the shower plate 9 is uniformly sprinkled on the water surface below, and the height of the shower plate 9 is higher than that of the water storage bin 8; the filter unit 4 is a curved filter screen 41 with a large filter area; the upper end of the partition board between the filter unit 4 and the purifying bin 7 is provided with a plurality of pointed bulges 20 which can block sundries and disperse water flow to ensure that water can be fully contacted with air.

Copper silver ion generating unit 5 is the common copper silver ion generator in the market, and what the electrolysis was during the electrolysis is red copper, contains 5% silver in the red copper, and copper and silver are the electrolysis ion simultaneously during the electrolysis, and copper silver ion has fine sterilization algae removal effect, and copper silver ion can not evaporate to the air in, has avoided chlorine to disinfect the inherent problem that chlorine causes people uncomfortable in the air, and during copper silver ion electrolysis, also easily automatic control has avoided the trouble of daily artifical offeing medicine.

As shown in fig. 1, the ozone generating unit 10 includes an ultraviolet lamp 101 and a photocatalytic plate 102 disposed above the ultraviolet lamp 101, the photocatalytic plate 102 is a titanium dioxide photocatalytic ceramic plate 62, the ultraviolet lamp 101 is disposed above the water outlet pipe 3, a water distribution plate 11 with a plurality of through holes 19 is arranged above the photocatalysis plate 102, the height of the water distribution plate 11 is lower than that of the water storage bin 8, in normal operation, the diameter of the water outlet pipe 3 is larger than that of the water inlet pipe 2, the water surface at the ozone generating unit 10 is lower than that of the water outlet pipe 3, the ultraviolet lamp 101 can generate ozone after being exposed in the air and contacting with the air, the swimming pool water is mixed with the air containing ozone entering the drainage pipeline together after being sprinkled from the water distribution plate 11, the disinfection effect can be improved, an air inlet 12 is arranged on a side plate of the box body 1 above the ozone generating unit 10, so that sufficient air in the box body 1 can react into ozone; the water collecting plate 15 is arranged on the side plate of the partition board around the ultraviolet lamp 101 and the ultraviolet lamp 61.

As shown in fig. 2 and fig. 3, ultraviolet lamp 61 is in ultraviolet lamp 61 water-collecting plate 15 and titanium dioxide photocatalytic ceramic plate 62 all around install in a frame 21 that is penetrating from top to bottom, be equipped with the chute 23 at frame 21 upper end opening part, titanium dioxide photocatalytic ceramic plate 62 has two all to slide and connect in chute 23, can conveniently dismantle or install titanium dioxide photocatalytic ceramic plate 62, titanium dioxide photocatalytic ceramic plate 62 is the ventilative perforated plate that permeates water, leave logical groove 22 between both sides and frame 21 inner wall about titanium dioxide photocatalytic ceramic plate 62, the setting up of logical groove 22 makes titanium dioxide photocatalytic ceramic plate 62 when blockked up by impurity, rivers also can normally follow logical groove 22 in through can normally working.

As shown in fig. 4, the shower plate 9 and the water distribution plate 11 are the same plate, the shower plate 9 and the water distribution plate 11 are both provided with hooks 17, the shower plate 9 and the water distribution plate 11 are hung on the top of the partition plate through the hooks 17, and the shower plate 9 and the water distribution plate 11 are both provided with drainage grooves 18 communicating with the through holes 19, so that the water in the swimming pool is more uniform when falling.

The implementation principle of the above embodiment is as follows: swimming pool water is pumped into the box body 1 by a water pump, the swimming pool water firstly passes through a bin chamber of a copper-silver ion generator, enters the bin chamber of a next door filter unit 4 at the bottom of the bin chamber for filtering, the bin chamber of the filter unit 4 overflows to a shower plate 9 of the next door after being filled with water to form a shower spray which falls on the water surface below, the swimming pool water is fully contacted with the air to improve the oxygen content in the water, a titanium dioxide photocatalysis plate 102 in the water can change water molecules into hydroxyl radicals after being irradiated by ultraviolet rays, the hydroxyl radicals can be used as strong oxidants to sterilize and kill algae, the water can also oxidize organic pollutants in the water into carbon dioxide and water to play a role of purifying the water, the water in the bin of an ultraviolet purification unit 6 enters a water storage bin 8 from the bottom, and overflows to a water distribution plate 11 of the next door after the water storage bin 8 is filled with the water, and falls on the water surface below like the shower spray, ultraviolet lamp 101 and air contact produce ozone, and the water in the ozone generating unit 10 storehouse flows back to the swimming pool again from outlet pipe 3 in, and the aquatic is mingled with copper silver ion and can be disinfected the disinfection constantly to the water in the swimming pool, and the water in the outlet pipe 3 is not full of, and ozone can be inhaled and mix with water.

Comparison table of disinfection effect of copper silver ion and ultraviolet ray (comparison with silver ion concentration of 0.02 mg/l)

As can be seen from the table, the disinfection effect of copper and silver ions alone is slow, the disinfection effect is 60 minutes, the inactivation rate (= -lg (Nt/No)) is only 1.3lg, and the disinfection effect of copper and silver ions is similar to the total number of bacteria, wherein the inactivation rate (= -lg (Nt/No)) can reach 1.7lg in 5 minutes after ultraviolet rays are added to the copper and silver ions.

Copper silver ion continuous disinfection effective time table (silver ion concentration is used for comparison)

Time (hours)	0 hour	10 hours	20 hours	50 hours	70 hours
						Inactivation rate (silver ion concentration of 0.02 mg/l)	0	5.5	4.3	4.2	0.22
Inactivation rate (silver ion concentration of 0.05 mg/l)	0	5.5	4.8	5.4	4.5

As can be seen from the above table, the effective disinfection time is about 50-60 hours when the silver ion concentration is 0.02mg/l, and the inactivation is still excellent for 70 hours when the silver ion concentration is 0.05 mg/l. Copper silver ions are therefore very good stabilizers for swimming pool disinfection.

The combination of the copper silver ions and the ultraviolet rays can obviously reduce the dosage of the copper silver ion disinfectant by 30 to 50 percent, on one hand, the copper silver ion hydrate can be changed into the copper silver ions again to enter the water under the action of the ultraviolet rays, and on the other hand, the growth of the biomass in the water can be inhibited under the action of the ultraviolet rays, thereby reducing the consumption of the copper silver ions.

Example two

Referring to fig. 5, for the utility model discloses a swimming pool ultraviolet photocatalysis copper silver ion disinfection purifier, the shape of box 1 is the cask type with the embodiment difference, filter unit 4 is tubbiness filter screen 41, inlet tube 2 separates through filter screen 41 with outlet pipe 3, inlet tube 2 sets up in filter screen 41 open-ended below, outlet pipe 3 sets up in filter screen 41 open-ended top, be provided with tubulose interior bucket 16 in filter screen 41, be provided with annular water collecting plate 15 along its axial direction on the inner wall of interior bucket 16, ultraviolet purification unit 6 sets up in interior bucket 16, water gathers when passing through water collecting plate 15 and stops, make water and ultraviolet contact better, ultraviolet purification unit 6 includes ultraviolet lamp 61 and titanium dioxide photocatalysis ceramic plate 62, ultraviolet lamp 61 is vertical rectangular shape, the highest point of ultraviolet lamp 61 is higher than the height of inlet tube 2, the titanium dioxide photocatalytic ceramic plates 62 are respectively arranged at the left side and the right side of the ultraviolet lamp 61, so that the disinfection effect can be improved, and when the titanium dioxide photocatalytic ceramic plates are used, the ultraviolet lamp 61 is exposed out of the water surface and contacts with air to generate ozone to be mixed with water; a sewage outlet 13 is arranged on the bottom plate of the barrel-shaped box body 1, a valve 14 is arranged at the sewage outlet 13, and the valve 14 is an electromagnetic valve.

The implementation principle of the above embodiment is as follows: with swimming pool water through the water pump extraction, swimming pool water is at first through copper silver ion generator reentrant cask type's box 1 in, copper silver ion is taken into the box 1 simultaneously along with water and takes place the flocculation, when water got into from the bottom of interior bucket 16, the impurity of large granule is by the separation of filter screen 41, drop drain 13, rivers pass titanium dioxide photocatalysis ceramic plate 62 and flow toward ultraviolet lamp 61 one side after following the in-process part rivers that up flow to be blockked by water collecting plate 15, rivers striking will return to after ultraviolet lamp 61 and pass titanium dioxide photocatalysis ceramic plate 62, so circulation makes rivers and titanium dioxide photocatalysis ceramic plate 62 fully contact, get back to the swimming pool in from outlet pipe 3 after being full of water in interior bucket 16 again.

Claims

1. The utility model provides a swimming pool ultraviolet photocatalysis copper silver ion disinfection clarifier, includes box (1) that has inlet tube (2) and outlet pipe (3), its characterized in that: the box body (1) is internally provided with a filtering unit (4), a copper silver ion generating unit (5) and an ultraviolet purifying unit (6), the copper silver ion generating unit (5), the filtering unit (4) and the ultraviolet purifying unit (6) are arranged from the water inlet pipe (2) to the water outlet pipe (3) in sequence, and the box body (1) is also internally provided with an ozone generating unit (10).

2. The ultraviolet photocatalytic copper-silver ion disinfection purifier for swimming pools as recited in claim 1, wherein: the ultraviolet purification unit (6) comprises an ultraviolet lamp (61) and a titanium dioxide photocatalytic ceramic plate (62).

3. The ultraviolet photocatalytic copper-silver ion disinfection purifier for swimming pools as recited in claim 2, wherein: be equipped with in box (1) and purify storehouse (7) and water storage storehouse (8), purify storehouse (7) upper end and inlet tube (2) intercommunication each other, purify the bottom of storehouse (7) and water storage storehouse (8) and communicate each other, the upper end and outlet pipe (3) intercommunication of water storage storehouse (8), the height that highly is less than water storage storehouse (8) of outlet pipe (3), ultraviolet purification unit (6) set up in purifying storehouse (7), and ultraviolet purification unit (6) are still including gondola water faucet board (9) that have a plurality of through-holes (19), gondola water faucet board (9) are located the top of titanium dioxide photocatalysis ceramic plate (62), titanium dioxide photocatalysis ceramic plate (62) are located the top of ultraviolet lamp (61), the height that highly is greater than water storage storehouse (8) of gondola water faucet board (9).

4. The ultraviolet photocatalytic copper-silver ion disinfection purifier for swimming pools as recited in claim 3, wherein: ozone generating unit (10) set up between delivery port and water storage storehouse (8), and ozone generating unit (10) include ultraviolet lamp (101) and photocatalysis board (102), photocatalysis board (102) set up the top at ultraviolet lamp (101), ultraviolet lamp (101) set up the top at outlet pipe (3).

5. The ultraviolet photocatalytic copper-silver ion disinfection purifier for swimming pools as recited in claim 4, wherein: a water distribution plate (11) with a plurality of through holes (19) is arranged above the photocatalytic plate (102), and the height of the water distribution plate (11) is lower than that of the water storage bin (8).

6. The ultraviolet photocatalytic copper-silver ion disinfection purifier for swimming pools as recited in claim 5, wherein: an air inlet (12) is arranged on the side wall of the box body (1).

7. The ultraviolet photocatalytic copper-silver ion disinfection purifier for swimming pools as recited in claim 2, wherein: box (1) is the cask type, filter unit (4) are filter screen (41) of tubbiness, ultraviolet purification unit (6) set up in filter screen (41), inlet tube (2) separate through filter screen (41) with outlet pipe (3), inlet tube (2) set up in filter screen (41) open-ended below, outlet pipe (3) set up in filter screen (41) open-ended top.

8. The ultraviolet photocatalytic copper-silver ion disinfection purifier for swimming pools as recited in claim 7, wherein: the bottom of the box body (1) is provided with a sewage draining exit (13), and a valve (14) is arranged at the sewage draining exit (13).

9. The ultraviolet photocatalytic copper-silver ion disinfection purifier for swimming pools as recited in claim 8, wherein: the inner barrel (16) is arranged in the filter screen (41), the ultraviolet purification unit (6) is arranged in the inner barrel (16), and the inner wall of the inner barrel (16) at the periphery of the ultraviolet purification unit (6) is provided with a water-collecting plate (15).