Secondary water supply disinfection device and method

Abstract

The invention relates to a secondary water supply disinfection device and method. The secondary water supply disinfection device comprises a water tank, the ultraviolet disinfection assembly is positioned at the top in the water tank and comprises an ultraviolet LED substrate and a plurality of ultraviolet LED lamps which are positioned below the ultraviolet LED substrate and are in electric wire connection with the ultraviolet LED substrate; the water cooling plate is connected with the upper surface of the ultraviolet LED substrate and is used for heat dissipation of the ultraviolet LED substrate; the annular water distribution pipe comprises an annular water distribution pipe body, a plurality of cooling water pipes which are connected with the side part of the annular water distribution pipe body and are connected with the water tank, and a plurality of water flowing pipes which are connected with the bottom of the annular water distribution pipe body and face the water cooling plate. Compared with the prior art, the system has the advantages that water of a secondary water supply system is fully utilized as cooling water, so that heat of the ultraviolet LED lamp is dissipated, the service life of the LED lamp is prolonged, the disinfection efficiency of the whole system is improved, and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary water supply disinfection, and in particular to a secondary water supply disinfection device and method. Background Art

[0002] With the rapid economic development and urbanization process, urban buildings are becoming more common and super-high. In order to ensure the water supply and water pressure requirements of high-rise buildings, secondary water supply facilities have become an important part of the urban water supply system. Although drinking water in municipal water supply pipes generally maintains a certain level of disinfectant residue, due to long-term hydraulic retention and ventilation interaction with the outside world, secondary water supply facilities are prone to endogenous and exogenous secondary water pollution problems, which has become the biggest risk link that plagues the healthy and safe operation and maintenance of secondary water supply facilities.

[0003] Additional disinfection of secondary water supply is an effective way to ensure safe and stable water quality. Among them, ultraviolet disinfection has become the main method of secondary water supply disinfection due to its advantages of high efficiency, stability, little impact on water quality, and simple operation, and is widely used in China. At the same time, since the disinfected drinking water is directly delivered to each user, the main problem of ultraviolet disinfection without continuous disinfection ability can be avoided. Traditional ultraviolet disinfection equipment mostly uses low-pressure mercury lamps as ultraviolet light sources. However, low-pressure mercury lamps have defects such as long start-up time, low energy efficiency, short life, large size, and harmful mercury elements. With the increasingly stringent environmental protection regulations, the application of low-pressure mercury lamps has gradually been restricted. In contrast, ultraviolet LED technology has gradually become a research hotspot in the field of ultraviolet disinfection with its advantages of mercury-free, rapid start-up, high energy efficiency, small size, and long life.

[0004] However, the application of UV LED disinfection technology in secondary water supply systems faces the problem of heat dissipation. Continuous UV disinfection may lead to high energy consumption of the equipment and large heat accumulation of the UV LED light source, which in turn affects the service life of the LED and the disinfection efficiency of the entire system. The heat generated by the UV LED during operation needs to be effectively dissipated to prevent the equipment from overheating, especially in application scenarios with large flow or long-term operation, where heat dissipation is particularly critical.

[0005] Therefore, it is of great significance to achieve efficient cooling of UV LEDs, improve their working efficiency and service life, further optimize energy consumption, and at the same time ensure an efficient and reliable disinfection solution for the secondary water supply system. Summary of the invention

[0006] The purpose of the present invention is to provide a secondary water supply disinfection device and method in order to overcome the defects of the above-mentioned prior art, make full use of the water in the secondary water supply system as cooling water, so as to dissipate heat for the ultraviolet LED lamp, which is beneficial to improve the service life of the LED lamp and the disinfection efficiency of the entire system.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] In one aspect, the present invention provides a secondary water supply disinfection device, comprising:

[0009] Water tank;

[0010] An ultraviolet disinfection assembly located at the top of the water tank, comprising an ultraviolet LED substrate, and a plurality of ultraviolet LED lamps located below the ultraviolet LED substrate and connected to the ultraviolet LED substrate by wires;

[0011] A water cooling plate connected to the upper surface of the UV LED substrate and used for heat dissipation;

[0012] And an annular water distribution pipe located above the water cooling plate, which includes an annular water distribution pipe body, a plurality of cooling water pipes connected to the side of the annular water distribution pipe body and connected to the water tank, and a plurality of water flow pipes connected to the bottom of the annular water distribution pipe body and facing the water cooling plate.

[0013] Furthermore, the area of ​​the ultraviolet LED substrate is smaller than the area of ​​the water-cooling plate, and the ultraviolet LED substrate is within the vertical projection plane of the water-cooling plate.

[0014] Furthermore, the ultraviolet LED substrate is connected to the water cooling plate via a plurality of bolts.

[0015] Furthermore, the ultraviolet LED lamps are arranged at intervals, and the intervals between two adjacent ultraviolet LED lamps are equal.

[0016] Furthermore, when the ultraviolet LED substrate is rectangular, the ultraviolet LED lamps are arranged in an array; when the ultraviolet LED substrate is circular, a number of the ultraviolet LED lamps are evenly distributed around the circumference to form a plurality of circular rings with the center of the ultraviolet LED substrate as the center, and the plurality of circular rings are evenly distributed radially.

[0017] Furthermore, a baffle inclined outward is provided at the edge of the water cooling plate.

[0018] Furthermore, the center of the water cooling plate is recessed downward.

[0019] Furthermore, the center of the water cooling plate is sunken downward at an angle of 5° to 15°, so that the water cooling plate has a certain water storage function.

[0020] Furthermore, the water flow pipe is vertically downward or obliquely outward with a certain angle.

[0021] Furthermore, a temperature sensor for detecting the temperature of the ultraviolet LED substrate is provided between the water cooling plate and the ultraviolet LED substrate.

[0022] Furthermore, the UV LED substrate and UV LED lamp are connected to external power wires, and a through pipe for placing the wires of the UV LED substrate and UV LED lamp is provided at the center of the water cooling plate; the annular water distribution pipe is sleeved on the outside of the through pipe.

[0023] Furthermore, the temperature sensor is connected to an external power supply wire, and the wire is arranged in the through pipe.

[0024] Furthermore, a plug for plugging the through pipe is provided at the upper end of the through pipe.

[0025] Furthermore, a water inlet pipe for water inlet is provided at the upper part of the water tank, and a water outlet pipe for water outlet is provided at the lower part of the water tank;

[0026] The cooling water pipe comprises an inlet cooling water pipe connected to the water inlet pipe and a self-circulating cooling water pipe connected to the water outlet pipe.

[0027] Furthermore, the water inlet cooling water pipe is connected to the water inlet pipe through a first branch pipe, and a first check valve is provided on the first branch pipe to prevent water from flowing back;

[0028] The self-circulating cooling water pipe is connected to the water outlet pipe through a second branch pipe, and a second check valve and a water pump are provided on the second branch pipe. The second check valve is used to prevent water from flowing back, and the water pump is used to pump water in the water tank into the second branch pipe.

[0029] Furthermore, the second check valve is located above the water pump.

[0030] On the other hand, the present invention also provides a secondary water supply disinfection method, which is implemented using the secondary water supply disinfection device described above, and comprises the following steps:

[0031] A1. Turn on the UV LED lamp to start disinfection;

[0032] A2. Introduce the water in the water tank into the annular water distribution pipe body through the cooling water pipe, and flow out from the water flow pipe to the water cooling plate to dissipate the heat of the UV LED substrate;

[0033] A3. After a period of time, stop introducing the water in the water tank into the annular water distribution pipe body through the cooling water pipe, and use the residual water in the water cooling plate to dissipate heat from the UV LED substrate;

[0034] A4. After a period of time, turn off the UV LED lamp;

[0035] A5. Repeat steps A1 to A4 at regular intervals.

[0036] Furthermore, the secondary water supply disinfection method includes nighttime disinfection and daytime disinfection respectively.

[0037] Furthermore, in step A5, steps A1 to A4 are repeated every 4 to 6 hours.

[0038] Furthermore, at night, the water inlet pipe of the water tank starts to take in water, and the specific process of nighttime disinfection includes the following steps:

[0039] B1. Turn on the ultraviolet LED lamp to start disinfection;

[0040] B2. Water enters the water tank through the water inlet pipe, flows into the water tank, and the water in the first water inlet pipe is introduced into the annular water distribution pipe body through the water inlet cooling water pipe, and flows out from the water flow pipe to the water cooling plate to dissipate heat for the UV LED substrate;

[0041] B3. After a period of time, close the first check valve, stop introducing the water in the water inlet pipe into the annular water distribution pipe body through the water inlet cooling water pipe, and dissipate the heat of the ultraviolet LED substrate through the residual water in the water cooling plate;

[0042] B4. After a period of time, turn off the UV LED lamp.

[0043] Furthermore, during the day, the water inlet pipe of the water tank stops taking in water, and the specific process of nighttime disinfection includes the following steps:

[0044] C1. Turn on the ultraviolet LED lamp to start disinfection;

[0045] C2. Open the second check valve and the water pump to allow the water in the water tank to be introduced into the annular water distribution pipe body through the self-circulating cooling water pipe, and then flow out from the water pipe to the water cooling plate to dissipate heat from the UV LED substrate;

[0046] C3. After a period of time, close the second check valve and the water pump, stop introducing the water in the water inlet tank into the annular water distribution pipe body through the self-circulating cooling water pipe, and dissipate the heat of the ultraviolet LED substrate through the residual water in the water cooling plate;

[0047] C4. After a period of time, turn off the UV LED lamp;

[0048] C5. Repeat steps C1 to C4 at regular intervals.

[0049] Furthermore, disinfection is performed 1 to 2 times at night and 1 to 3 times during the day.

[0050] Furthermore, in step B3, after 0.5 to 2 hours, the first check valve is closed; in step B4, after 1 to 2 hours, the ultraviolet LED lamp is turned off.

[0051] Furthermore, in step C3, after 2 to 3 hours, the second check valve and the water pump are closed; in step B4, after 1 to 2 hours, the ultraviolet LED lamp is closed.

[0052] Compared with the prior art, the present invention has the following advantages:

[0053] (1) The present invention provides a solution to the key heat dissipation problem of the UV LED disinfection method in practical applications. The present invention dissipates heat by providing a UV disinfection component and a water cooling plate, making full use of the water inside the water tank as cooling water, thereby dissipating heat for the UV LED lamp, which is beneficial to improving the service life of the LED lamp and the disinfection efficiency of the entire system.

[0054] (2) The present invention improves the disinfection effect of ultraviolet disinfection on the secondary water supply tank while minimizing the possibility of secondary contamination of the water tank. The growth of microorganisms in the water tank is suppressed by controlling the intermittent opening and closing of the ultraviolet LED lamp. While the ultraviolet disinfection is being carried out, the water level in the water tank changes, which can not only fully disinfect the water in the water tank, but also disinfect the inner wall of the water tank. In addition, the cooling water used in the system belongs to the water inside the water tank, rather than being connected from the outside. This avoids the interaction between the water tank and the outside world as much as possible and reduces the possibility of secondary contamination of the water tank.

[0055] (3) Fully improve the operating efficiency of the system and reduce energy consumption. First, the present invention solves the heat dissipation problem in the application of ultraviolet LED lamps, improves the service life of ultraviolet LED lamps and the disinfection efficiency of the system; secondly, although the cooling water pipe is closed, some water will remain on the water cooling plate, so that the ultraviolet LED lamp can still operate, making full use of the cooling effect of water and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a structural schematic diagram of the secondary water supply disinfection device shown in Example 1;

[0057] Figure 2 It is a structural schematic diagram of the annular water distribution pipe shown in Example 1;

[0058] Figure 3 It is a schematic flow chart of the secondary water supply disinfection method shown in Example 1;

[0059] Figure 4 This is a schematic structural diagram of the secondary water supply disinfection device shown in Example 2.

[0060] Description of the markings in the figure:

[0061] 1-water tank, 11-water inlet pipe, 12-water outlet pipe, 13-first branch pipe, 14-first check valve, 15-second branch pipe, 16-second check valve, 17-water pump;

[0062] 2-ultraviolet disinfection component, 21-ultraviolet LED substrate, 22-ultraviolet LED lamp;

[0063] 3-water cooling plate, 31-baffle, 32-through pipe, 321-plug, 33-bolt, 34-temperature sensor;

[0064] 4-annular water distribution pipe, 41-annular water distribution pipe body, 42-cooling water pipe, 421-inlet cooling water pipe, 422-self-circulating cooling water pipe, 43-flowing water pipe. DETAILED DESCRIPTION

[0065] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments. In the following embodiments or embodiments, if there is no special description of the functional components or structures, it means that they are all conventional components or conventional structures used in the art to achieve the corresponding functions.

[0066] It should be noted that in the description of the present invention, the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] Example 1

[0069] A secondary water supply disinfection device, such as Figure 1 and 2 As shown, including:

[0070] Water tank 1;

[0071] The ultraviolet disinfection assembly 2 located at the top of the water tank 1 includes an ultraviolet LED substrate 21 and a plurality of ultraviolet LED lamps 22 located below the ultraviolet LED substrate 21 and connected to the ultraviolet LED substrate 21 by wires;

[0072] A water cooling plate 3 connected to the upper surface of the UV LED substrate 21 and used for heat dissipation;

[0073] And an annular water distribution pipe 4 located above the water-cooled plate 3, which includes an annular water distribution pipe body 41, two cooling water pipes 42 connected to the side of the annular water distribution pipe body 41 and connected to the water tank 1, and four water flow pipes 43 connected to the bottom of the annular water distribution pipe body 41 and facing the water-cooled plate 3.

[0074] In this embodiment, the area of ​​the ultraviolet LED substrate 21 is smaller than the area of ​​the water-cooling plate 3 , and the ultraviolet LED substrate 21 is within the vertical projection plane of the water-cooling plate 3 .

[0075] In this embodiment, the UV LED substrate 21 is connected to the water cooling plate 3 via a plurality of bolts 33 .

[0076] In this embodiment, the ultraviolet LED lamps 22 are arranged at intervals, and the intervals between two adjacent ultraviolet LED lamps 22 are equal.

[0077] In this embodiment, when the ultraviolet LED substrate 21 is circular, a plurality of the ultraviolet LED lamps 22 are evenly distributed along the circumference to form a plurality of circular rings with the center of the ultraviolet LED substrate 21 as the center, and the plurality of circular rings are evenly distributed along the radial direction.

[0078] In this embodiment, a baffle 31 inclined outward is provided at the edge of the water cooling plate 3 .

[0079] In this embodiment, the center of the water cooling plate 3 is recessed downward.

[0080] In this embodiment, the center of the water-cooling plate 3 is sunken downward at an angle of 5°, so that the water-cooling plate 3 has a certain water storage function.

[0081] In this embodiment, the water flow pipe 43 is vertically downward, and four water flow pipes 43 are distributed at equal intervals.

[0082] In this embodiment, the ultraviolet LED substrate 21 and the ultraviolet LED lamp 22 are connected to the external power wires, and a through pipe 32 for placing the wires of the ultraviolet LED substrate 21 and the ultraviolet LED lamp 22 is provided at the center of the water cooling plate 3; the annular water distribution pipe 4 is sleeved on the outside of the through pipe 32.

[0083] In this embodiment, a plug 321 for plugging the through pipe 32 is disposed at the upper end of the through pipe 32 .

[0084] In this embodiment, a water inlet pipe 11 for water inlet is provided at the upper part of the water tank 1, and a water outlet pipe 12 for water outlet is provided at the lower part of the water tank 1;

[0085] The cooling water pipe 42 includes an inlet cooling water pipe 421 connected to the water inlet pipe 11 and a self-circulating cooling water pipe 422 connected to the water outlet pipe 12 .

[0086] In this embodiment, the water inlet cooling water pipe 421 is connected to the water inlet pipe 11 through a first branch pipe 13, and a first check valve 14 is provided on the first branch pipe 13 to prevent water from flowing back;

[0087] The self-circulating cooling water pipe 422 is connected to the water outlet pipe 12 via a second branch pipe 15 , and a second check valve 16 and a water pump 17 are provided on the second branch pipe 15 . The second check valve 16 is used to prevent water backflow, and the water pump 17 is used to pump water in the water tank 1 into the second branch pipe 15 .

[0088] In this embodiment, the second check valve 16 is located above the water pump 17 .

[0089] In this embodiment, the water tank 1 is made of 304 stainless steel.

[0090] A secondary water supply disinfection method, which is implemented using the secondary water supply disinfection device, comprises the following steps: Figure 3 As shown:

[0091] When the water tank 1 is in a low water consumption period at night, the water inlet pipe 11 is in a water intake state, the liquid level in the water tank 1 is low, and begins to rise with the water intake, the ultraviolet disinfection component 2 is opened and the first check valve 14 is opened, part of the water is diverted from the water inlet pipe 11 to the water inlet cooling water pipe 421, and the water further flows into the annular water distribution pipe body 41, and the water flows along the four water flow pipes 43 to the water cooling plate 3, which can help the ultraviolet LED substrate 21 and the ultraviolet LED lamp 22 installed at the bottom thereof to dissipate heat. Because of the existence of the second check valve 16, the water flow is not The water pump 17 will be backflushed. At this time, the ultraviolet LED lamp 22 disinfects and cleans the exposed inner wall of the water tank 1 and the water. The duration of this stage depends on the water inflow time of the water tank. After about 1 hour, the first check valve 14 is closed, and the water inlet cooling water pipe 421 no longer inflows water, but some water still remains on the water cooling plate 3 to play a water cooling role. The ultraviolet LED lamp 22 continues to work. After about 1 hour, the ultraviolet disinfection component 2 is turned off, and the secondary water supply disinfection device is shut down for about 5 hours. This time will not allow the water in the water tank 1 to breed more microorganisms.

[0092] During the day, the water inlet pipe 11 basically stops taking in water, and a certain volume of water is stored in the water tank 1. When performing disinfection, the ultraviolet disinfection component 2, the second valve 16, and the water pump 17 are opened. The water pump 17 draws part of the water from the inside of the water tank 1 into the self-circulating cooling water pipe 422, and the water enters the annular water distribution pipe body 41, and further flows to the water-cooled plate 3 through the water flow pipe 43 to play a cooling role. During this process, due to the presence of the first check valve 14, the water flow will not enter the water inlet pipe 11 to cause backwashing. After running for about 2.5 hours, the second valve 16 and the water pump 17 are closed, and disinfection is continued for 1 hour, and then the ultraviolet disinfection component 2 is closed and rested for about 5 hours. This time will not allow the water in the water tank 1 to breed more microorganisms.

[0093] In this embodiment, the disinfection process of the secondary water supply system is mainly divided into three stages through the secondary water supply disinfection device, including UV LED disinfection with synchronous water cooling, continuous UV disinfection with suspended water cooling, and suspended disinfection and water cooling. The duration of the three stages is different, and the three stages can be cycled three times in one day. The UV LED disinfection with synchronous water cooling stage uses self-circulating cooling water for water cooling during the day and uses a water-inlet cooling chamber for water cooling at night.

[0094] In this embodiment, the process can be completed three times in a day, one time at night, with a total disinfection time of about 2 hours, and two times during the day, with a total disinfection time of about 7 hours. In this way, the ultraviolet disinfection equipment is turned on for about 9 hours a day, and the actual operating time can be slightly adjusted according to the water use situation in the community.

[0095] Example 2

[0096] The secondary water supply disinfection device of this embodiment is based on the embodiment 1. Figure 4 As shown, a temperature sensor 34 for detecting the temperature of the ultraviolet LED substrate 21 is further provided between the water cooling plate 3 and the ultraviolet LED substrate 21. The temperature sensor 34 is connected to an external power supply wire, and its wire is provided in the through pipe 34.

[0097] The secondary water supply disinfection method of this embodiment controls the disinfection time and the device shutdown time by combining the temperature data of the temperature sensor 34 and the operation time during the operation of the device.

[0098] Comparative Example 1

[0099] Compared with Example 1, Comparative Example 1 uses an ordinary secondary water supply tank, and has the water tank 1 described in Example 1, but does not have an ultraviolet disinfection component 2, a water cooling plate 3, or an annular water distribution pipe 4. The material and manufacturing process of the water tank 1 are the same as those of Example 1, both of which are 304 stainless steel.

[0100] The secondary water supply disinfection device of Example 1 and the ordinary secondary water supply water tank of Comparative Example 1 were selected for sterilization effect comparison, and the hydroxypropyl cellulose HPC concentration in the water tank 1 was tested at regular intervals. The test results are shown in Table 1, where the HPC reduction rate (%) = 100*(1-actual measured HPC concentration of Example 1 / actual measured HPC concentration of Comparative Example 1).

[0101] The secondary water supply disinfection device of Example 1 and the ordinary secondary water supply tank of Comparative Example 1 were selected to evaluate the impact of three disinfection by-products: chloroform, dibromochloromethane, and dibromochloromethane. The concentrations of chloroform, dibromochloromethane, and dibromochloromethane were tested at regular intervals. The results are shown in Table 2.

[0102] It should be noted that the initial state is day 0, the water tanks 1 of Example 1 and Comparative Example 1 are filled with water, the secondary water supply disinfection device of Example 1 is started, and the ordinary secondary water supply tank of Comparative Example 1 is stationary, and samples are taken after one day, which is the HPC concentration on day 1.

[0103] Table 1 Sterilization effect comparison table

[0104]

[0105] Table 2 Impact evaluation of three disinfection by-products: chloroform, dibromochloromethane, and dibromochloromethane

[0106]

[0107] Comparing the measured values ​​of Example 1 and Comparative Example 1 in Table 1 and Table 2, Example 1 has a significant effect on inhibiting microbial growth compared with Comparative Example 1, and the HPC reduction rate is more than 60%. The longer the residence time of water in the water tank, the more obvious the reduction effect on HPC. When the residence time reaches the 6th day, the HPC is reduced by more than 88% compared with the ordinary water tank of Comparative Example 1. At the same time, the generation amount of three disinfection by-products, chloroform, monobromochloromethane and dibromochloromethane, is reduced. This shows that the present invention can achieve a better antibacterial effect while reducing the concentration of disinfection by-products.

[0108] Although the present invention has been described in detail above by means of general description, specific implementation methods and tests, it is obvious to those skilled in the art that some modifications or improvements may be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A secondary water supply disinfection device, comprising a water tank (1), characterized in that: The secondary water supply disinfection device also includes: An ultraviolet disinfection assembly (2) located at the top of the water tank (1), comprising an ultraviolet LED substrate (21), and a plurality of ultraviolet LED lamps (22) located below the ultraviolet LED substrate (21) and connected to the ultraviolet LED substrate by wires; A water cooling plate (3) connected to the upper surface of the ultraviolet LED substrate (21) and used for heat dissipation; and an annular water distribution pipe (4) located above the water cooling plate (3), comprising an annular water distribution pipe body (41), a plurality of cooling water pipes (42) connected to the side of the annular water distribution pipe body (41) and connected to the water tank (1), and a plurality of water flow pipes (43) connected to the bottom of the annular water distribution pipe body (41) and facing the water cooling plate (3).

2. A secondary water supply disinfection device according to claim 1, characterized in that: The area of ​​the ultraviolet LED substrate (21) is smaller than the area of ​​the water cooling plate (3), and the ultraviolet LED substrate (21) is within the vertical projection plane of the water cooling plate (3).

3. A secondary water supply disinfection device according to claim 1, characterized in that: The ultraviolet LED substrate (21) is connected to the water cooling plate (3) via a plurality of bolts (33).

4. A secondary water supply disinfection device according to claim 1, characterized in that: The ultraviolet LED lamps (22) are arranged at intervals, and the intervals between two adjacent ultraviolet LED lamps (22) are equal.

5. A secondary water supply disinfection device according to claim 1, characterized in that: The edge of the water cooling plate (3) is provided with a baffle (31) inclined outwards.

6. A secondary water supply disinfection device according to claim 1, characterized in that: The center of the water cooling plate (3) is recessed downwards.

7. A secondary water supply disinfection device according to claim 1, characterized in that: The ultraviolet LED substrate (21) and the ultraviolet LED lamp (22) are connected to external power supply wires, and a through pipe (32) for placing the wires of the ultraviolet LED substrate (21) and the ultraviolet LED lamp (22) is provided at the center of the water cooling plate (3); the annular water distribution pipe (4) is sleeved on the outside of the through pipe (32).

8. A secondary water supply disinfection device according to claim 1, characterized in that: The upper part of the water tank (1) is provided with a water inlet pipe (11) for water inlet, and the lower part of the water tank (1) is provided with a water outlet pipe (12) for water outlet; The cooling water pipe (42) comprises an inlet cooling water pipe (421) connected to the water inlet pipe (11) and a self-circulating cooling water pipe (422) connected to the water outlet pipe (12).

9. A secondary water supply disinfection device according to claim 8, characterized in that: The water inlet cooling water pipe (421) is connected to the water inlet pipe (11) via a first branch pipe (13), and a first check valve (14) is provided on the first branch pipe (13); The self-circulating cooling water pipe (422) is connected to the water outlet pipe (12) via a second branch pipe (15), and the second branch pipe (15) is provided with a second check valve (16) and a water pump (17).

10. A secondary water supply disinfection method, which is implemented by using a secondary water supply disinfection device according to any one of claims 1 to 7, characterized in that: The following steps are involved: A1, turn on the ultraviolet LED lamp (22) to start disinfection; A2, introducing the water in the water tank (1) into the annular water distribution pipe body (41) through the cooling water pipe (42), and flowing out from the water flow pipe (43) to the water cooling plate (3), so as to dissipate heat for the ultraviolet LED substrate (21); A3. After a period of time, the water in the water tank (1) is stopped from being introduced into the annular water distribution pipe body (41) through the cooling water pipe (42), and the residual water in the water cooling plate (3) is used to dissipate heat from the ultraviolet LED substrate (21); A4. After a period of time, turn off the UV LED lamp (22); A5. Repeat steps A1 to A4 at regular intervals.

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