[0014] Such as figure 1 , figure 2 , image 3 As shown, the present invention is realized in this way, a UV lamp 2 is inserted in the center of the water filter 1, and the water filter 1 is made of circular column ordinary glass, and the outer wall of the water filter 1 is pasted with a layer of black Shading paper or coated with a layer of opaque material, the upper two sides of the water filter 1 are connected to the water inlet pipe 3 and the water outlet pipe 4 respectively. The water inlet pipe 3 is connected to the smart seat 5 of the drinking fountain, and the outlet pipe 4 is connected to the cold water valve 6 of the drinking fountain. , The ultraviolet lamp 2 is H-type, the length of the lamp tube of the ultraviolet lamp is equivalent to the height of the water filter, and the ultraviolet wavelength of the ultraviolet lamp 2 is mainly between 200-300nm. Since the design of the water dispenser UV disinfection auxiliary device is as large as the water dispenser heating auxiliary device, and there is a large space at the bottom of the water dispenser besides the heating auxiliary device, a bracket can be added to the bottom shell to directly connect the UV disinfection auxiliary device Fixed on the bottom shell of the water dispenser (inside the machine). The power switch of the ultraviolet disinfection auxiliary device is installed at the upper end of the back side of the water dispenser (separate switch). The common water dispenser has only the heating auxiliary device, and its power switch is at the upper end of the rear side of the water dispenser. In other words, there is just the same large space to fix the UV disinfection auxiliary device at the symmetrical position of the heating auxiliary device at the bottom of the water dispenser. Does not affect the appearance.
[0015] A common water dispenser has two waterway systems. One is to connect the hot water valve through a heating auxiliary device; the other is a hose connected between the smart seat and the cold water valve to drink directly without heating. In this experiment, the ultraviolet disinfection device of the water dispenser was connected to the waterway between the smart seat and the cold water valve. When in use, the bottled water passed through the ultraviolet disinfection device to kill bacteria in the water. The hot water intake is not continuous, and it requires several minutes of heating time. Based on this, the volume (filling capacity) of the water filter of the ultraviolet disinfection device is designed to be slightly larger than the capacity of the commercially available paper cups, which can meet the needs of users. As long as the switch of the ultraviolet disinfection device is on, it can operate normally and kill bacteria in the cold water.
[0016] 1. Sampling
[0017] In the same day, the drinking fountains in 10 dormitories of a university are selected according to the time of activation as the research object; the day when the sealed port is activated is 0 days (control group), and the storage time is 1 day on the second day. By analogy, record the number of days that the pure water from the drinking fountain has been used or stored, and take 100ml of water from the drinking fountain.
[0018] Using an ultraviolet disinfection device, the bottled water used in the water dispenser for 15 days is used to collect 100ml of water samples at different irradiation times (1min, 3min, 5min, 10min, 30min), that is, to control the water sample in the form of water discharge The staying time in the device is also the UV disinfection time. Take samples every time period and make parallel samples to observe the sterilization effect of ultraviolet rays in each time period. At the same time, unsterilized water samples were collected as control samples.
[0019] 2. Method
[0020] The total number of bacteria is tested according to "Standard Test Method for Drinking Water" (GB/T5750-2006). The disinfection effect of the ultraviolet disinfection auxiliary device of the drinking fountain was evaluated in accordance with my country's "Sanitary Standards for Drinking Water" (2001), and the total number of bacteria was ≤100 cfu/ml.
[0021] 3 Results and analysis
[0022] 3.1 The relationship between the pollution of purified water from drinking fountains and the time of use
[0023] Within 2 days of using bottled water in the drinking fountain, the total number of bacteria still met the water quality sanitary standard, and after 3 days the total number of bacteria began to exceed the standard (see Table 1). The longer the unused bottled water stays in the drinking fountain, the more bacteria will breed, and the growth rate is also fast. After 19 days of using the bottled water in the drinking fountain, the total number of remaining drinking water colonies Up to 1600cfu/ml, far exceeding the sanitary standard of drinking water quality. The air in the barrel enters the barrel through the air inlet and the gap around the water inlet. The dust, smoke, microorganisms and other harmful substances contained in the air will be directly sucked into the water dispenser and barrel. Once the sealed bottled water is opened and used, it is equivalent to being exposed to the air all the time; while the bottled water contains almost no disinfectant and has no resistance to microorganisms, which causes bacteria to multiply and pollute the water.
[0024]
[0025] 3.2 The disinfection effect of the ultraviolet disinfection auxiliary device
[0026] It can be seen from Table 2 that in the drinking water (control sample) that has not been disinfected by ultraviolet rays, there are 1133 colonies per 1 ml of water. After 1 minute of UV irradiation, the number of colonies dropped to 1/8 of the original; after 30 minutes of irradiation, it was basically sterile. After 3 minutes of disinfection, the total number of bacteria is 60 cfu/ml, which meets the requirements of my country's "Drinking Water Hygiene Regulations" (2001) for the total number of bacteria (≤100 cfu/ml). In the sample 3 groups, the abnormal number of colonies in the 1min and 3min water samples may be caused by the incompletely drained water after the 30min sample collection in the 2 groups.
[0027]
[0028] Note: Control sample---not sterilized
[0029] 4 Conclusion
[0030] In this experiment, the ultraviolet disinfection device of the water dispenser was connected to the waterway between the smart seat and the cold water valve. When in use, the bottled water passed through the ultraviolet disinfection device to kill bacteria in the water. The water dispenser using this device can reduce the total number of bacteria to 60 cfu/ml for water samples exceeding 1100 cfu/ml (pure water for 15 days) after 3 minutes of ultraviolet irradiation, which meets my country's "Drinking Water Quality Standards" . UV disinfection does not need to add any drugs, does not produce any by-products, and has fast sterilization speed, high sterilization rate, and easy operation. It is a green disinfection method.
[0031] The ultraviolet disinfection auxiliary device of the water dispenser can achieve the purpose of direct and safe drinking. No one in the country has applied ultraviolet disinfection technology to drinking fountains after the project was established by the Nanchang Science and Technology Information Institute. Drinking ultraviolet disinfected water is safe and secure. If it can be promoted and applied, it will promote the technological innovation of water dispensers, have a good market development prospect, and will produce great social and economic benefits.
