Secondary water supply equipment with filtering and disinfecting functions

Abstract

The utility model relates to water supply equipment field discloses a secondary water supply equipment with filter disinfection function, including the water supply pipe, ultrafiltration device, bactericidal device, first detection device, water supply pump, water storage device, second detection device and water outlet pipe and control device connected in proper order along the water inlet direction, and water supply pump and water storage device are connected with first backflow pipe through first three -way valve, second detection device and water outlet pipe are connected with second backflow pipe through second three -way valve, and the water outlet end of first backflow pipe and the water outlet end of second backflow pipe are connected with the water inlet end of ultrafiltration device, the input of control device is electrically connected with first detection device, second detection device, and the output of control device is electrically connected with first three -way valve, second three -way valve. The utility model can solve how to filter disinfect water body, ensure that the problem of water quality meets the standard.

Description

Technical Field

[0001] This utility model relates to the field of water supply equipment, specifically to a secondary water supply equipment with filtration and disinfection functions. Background Technology

[0002] Secondary water supply refers to a water supply system where units or individuals store and pressurize urban public water supply or self-built water supply facilities before distributing it to users or for their own use through pipelines. Secondary water supply is primarily established to compensate for insufficient pressure in municipal water supply pipelines and to ensure water supply for residents living in high-rise buildings. Although secondary water supply solves the water problem for high-rise buildings, compared to raw water supply, the secondary water supply process involves storage and pressurization, which provides more opportunities for water pollution.

[0003] Currently, existing secondary water supply equipment mainly consists of municipal water supply pipes, filters, storage tanks, and user water pipes. Its working principle is relatively simple: the municipal water supply pipes introduce municipal water into the secondary water supply equipment, which is then filtered and stored in the storage tank. When users have water needs, the water in the storage tank is delivered to different users through the user water pipes.

[0004] However, this existing secondary water supply equipment has significant drawbacks. The most prominent problem is the lack of a water quality testing step. Although filters treat the water throughout the supply process, it's impossible to accurately monitor in real time whether the water quality from the storage tank meets relevant standards after storage. Because there's no water quality testing step, if the water in the storage tank becomes contaminated during storage, or if the filter malfunctions and its effectiveness decreases, this contaminated or substandard water will be directly supplied to users, posing a significant threat to their water safety.

[0005] Given the problems with existing secondary water supply equipment, it is necessary to develop a secondary water supply system with filtration and disinfection functions to ensure the quality of the effluent. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] This utility model provides a secondary water supply device with filtration and disinfection functions, which can at least solve the technical problem of how to filter and disinfect water to ensure that the quality of the effluent meets the standards.

[0008] (II) Technical Solution

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a secondary water supply device with filtration and disinfection functions, comprising:

[0010] The system consists of a water supply pipe, an ultrafiltration device, a sterilization device, a first detection device, a water supply pump, a water storage device, a second detection device, and an outlet pipe, connected sequentially along the water inlet direction. The water supply pump and the water storage device are connected by a first three-way valve, and the second detection device and the outlet pipe are connected by a second three-way valve, and the outlet ends of both the first and second return pipes are connected to the water inlet of the ultrafiltration device. Both the first and second detection devices are used to detect whether the water quality meets the standards.

[0011] The control device has an input terminal electrically connected to the first detection device and the second detection device, and an output terminal electrically connected to the first three-way valve and the second three-way valve. The control device is used to control the first three-way valve to connect the water supply pump and the water storage device or the first return pipe according to the detection result of the first detection device, and to control the second three-way valve to connect the second detection device and the water outlet pipe or the second return pipe according to the detection result of the second detection device.

[0012] Further configuration: the aforementioned ultrafiltration device includes a quartz sand filter tank, an activated carbon filter tank, and an ultrafiltration membrane module connected in sequence.

[0013] Further, the aforementioned secondary water supply equipment with filtration and disinfection functions also includes a chemical tank and a dosing pump. The inlet of the dosing pump is connected to the chemical tank, and the outlet of the dosing pump is connected between the activated carbon filter tank and the ultrafiltration membrane module through a third three-way valve. The chemical tank is used to store the scale inhibitor solution, and the dosing pump is used to pump the scale inhibitor solution in the chemical tank into the ultrafiltration membrane module. The output of the control device is also electrically connected to the third three-way valve and the dosing pump. The control device is also used to control the opening or closing of the dosing pump, and to control the third three-way valve to connect the ultrafiltration membrane module and the activated carbon filter tank or the dosing pump.

[0014] In a further configuration, the outlet of the aforementioned dosing pump is connected to the inlet of the ultrafiltration membrane module via a dosing pipe. A flow meter is installed on the dosing pipe, and the input of the control device is also electrically connected to the flow meter.

[0015] In a further configuration, the aforementioned water storage device includes at least two parallel water storage tanks, each with a first control valve and a second control valve at its inlet and outlet ends, respectively. The output end of the control device is also electrically connected to the first and second control valves, and the control device is also used to control the opening or closing of the first and second control valves.

[0016] Further configuration includes a level gauge inside the aforementioned water storage tank, a water supply switch valve on the water supply pipe, an input terminal of the control device electrically connected to the level gauge, and an output terminal of the control device electrically connected to the water supply switch valve and the water supply pump. The level gauge is used to detect the water level in the water storage tank and send it to the control device. The control device is also used to receive the water level signal generated by the level gauge and compare it with the set water level line, and control the opening or closing of the water supply switch valve and the water supply pump according to the comparison result.

[0017] Further configuration: the outlet ends of the first and second reflux pipes are connected to a main reflux pipe via a tee. The outlet ends of the main reflux pipe, the outlet ends of the water supply pipe, and the inlet ends of the ultrafiltration device are connected via a tee. Both the outlet ends of the first and second reflux pipes are equipped with check valves.

[0018] Furthermore, both the aforementioned first and second detection devices include a pH meter, a hardness meter, and a TDS sensor. The pH meter is used to detect the pH value of the water, the hardness meter is used to detect the hardness value of the water, and the TDS sensor is used to detect the TDS value of the water.

[0019] (III) Beneficial Effects

[0020] Compared with the prior art, the secondary water supply equipment with filtration and disinfection function provided by this utility model has the following beneficial effects:

[0021] When using the secondary water supply equipment with filtration and disinfection function provided by this utility model, firstly, the water supply pipe inputs water into the ultrafiltration device for filtration; then, the water supply pump drives the filtered water to flow sequentially into the sterilization device and the first detection device. The first detection device detects the water quality of the water flowing out of the sterilization device; if the water quality meets the standard, the control device controls the first three-way valve to connect the water supply pump and the water storage device, and the water supply pump pumps the water into the water storage device for storage and use; conversely, if the water quality does not meet the standard, the control device controls the first three-way valve to connect the water supply pump and the first return pipe, and the water supply pump returns the non-compliant water to the front end of the ultrafiltration device through the first return pipe, where it is filtered and sterilized alone or together with the water supplied by the water supply pipe. This cycle of filtration and sterilization continues until the first detection device detects that the water quality meets the standard. When a user has a water demand, the water stored in the water storage device flows into the second detection device, which tests the water quality output from the storage device. If the water quality meets the standards, the control device controls the second three-way valve to connect the second detection device and the outlet pipe, and the outlet pipe delivers the water to different users for use. Conversely, if the water quality does not meet the standards, the control device controls the second three-way valve to connect the second detection device and the second return pipe, and the water supply pump returns the non-compliant water to the front end of the ultrafiltration device through the second return pipe. The water is then filtered and sterilized separately or together with the raw water supplied by the water supply pipe. This cycle of filtration and sterilization continues until the second detection device detects that the water quality meets the standards. As can be seen, this utility model can perform multi-stage filtration and effective disinfection of incoming water through ultrafiltration and sterilization devices, removing impurities, microorganisms and other harmful substances from the water, thus ensuring the quality of the supplied water. The first and second detection devices can monitor the water quality at different stages in real time. The control device can intelligently control the return pipeline based on the detection results. When the water quality does not meet the standards, the water is returned to the ultrafiltration device for reprocessing. This cycle of filtration and disinfection of the water body avoids the situation where the water in the storage tank is contaminated or the water is supplied to users before it has been completely filtered and disinfected, thereby effectively ensuring that the final output water quality meets the standards and improving the safety and reliability of the water supply. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the pipeline connection of a secondary water supply device with filtration and disinfection functions in the embodiment.

[0023] Figure 2 This is a schematic diagram of the electrical connections of a secondary water supply device with filtration and disinfection functions in the embodiment.

[0024] Icon labels:

[0025] 1. Water supply pipe; 2. Ultrafiltration device; 3. Sterilization device; 4. First detection device; 5. Water supply pump; 6. Water storage device; 7. Second detection device; 8. Water outlet pipe; 9. Control device; 10. First three-way valve; 11. First return pipe; 12. Second three-way valve; 13. Second return pipe; 14. Quartz sand filter tank; 15. Activated carbon filter tank; 16. Ultrafiltration membrane module; 17. Chemical tank; 18. Dosing pump; 19. Third three-way valve; 20. Chemical inlet pipe; 21. Flow meter; 22. Water storage tank; 23. First control valve; 24. Second control valve; 25. Level gauge; 26. Water supply switch valve; 27. Return main pipe; 28. Check valve; 29. ​​pH meter; 30. Hardness meter; 31. TDS sensor. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This utility model provides a secondary water supply device with filtration and disinfection functions to solve the problem of how to filter and disinfect water to ensure that the quality of the effluent meets the standards.

[0028] See Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the pipe connections for a secondary water supply device with filtration and disinfection functions, as shown in the embodiment. Figure 2 The diagram shows the electrical connections of a secondary water supply device with filtration and disinfection functions in the embodiment. The secondary water supply device with filtration and disinfection functions includes a water supply pipe 1, an ultrafiltration device 2, a sterilization device 3, a first detection device 4, a water supply pump 5, a water storage device 6, a second detection device 7, an outlet pipe 8, and a control device 9.

[0029] Water supply pipe 1, ultrafiltration device 2, sterilization device 3, first detection device 4, water supply pump 5, water storage device 6, second detection device 7, and outlet pipe 8 are connected sequentially along the water inlet direction. A first return pipe 11 connects water supply pump 5 and water storage device 6 via a first three-way valve 10. A second return pipe 13 connects second detection device 7 and outlet pipe 8 via a second three-way valve 12. The outlet ends of both the first return pipe 11 and the second return pipe 13 are connected to the inlet end of ultrafiltration device 2. Water supply pipe 1 supplies water to this secondary water supply equipment and, through water supply pressure, drives the water into ultrafiltration device 2 for filtration. Water supply pump 5 drives water sequentially into ultrafiltration device 2 and sterilization device 3 for filtration and sterilization. After purification, the purified water is pumped into water storage device 6 for storage. Both the first detection device 4 and the second detection device 7 are used to detect whether the water quality meets the standards.

[0030] The input terminal of the control device 9 is electrically connected to the first detection device 4 and the second detection device 7, and the output terminal of the control device 9 is electrically connected to the first three-way valve 10 and the second three-way valve 12. The control device 9 is used to control the first three-way valve 10 to connect the water supply pump 5 and the water storage device 6 or the first return pipe 11 according to the detection result of the first detection device 4, and to control the second three-way valve 12 to connect the second detection device 7 and the water outlet pipe 8 or the second return pipe 13 according to the detection result of the second detection device 7.

[0031] When using the secondary water supply equipment with filtration and disinfection functions described above, firstly, water supply pipe 1 inputs water into ultrafiltration device 2 for filtration; subsequently, water supply pump 5 drives the filtered water to flow sequentially into sterilization device 3 and first detection device 4. The first detection device 4 detects the water quality of the water flowing out of sterilization device 3. If the water quality meets the standard, control device 9 controls the first three-way valve 10 to connect water supply pump 5 and water storage device 6, and water supply pump 5 pumps water into water storage device 6 for storage and use; conversely, if the water quality does not meet the standard, control device 9 controls the first three-way valve 10 to connect water supply pump 5 and first return pipe 11, and water supply pump 5 returns the non-compliant water to the front end of ultrafiltration device 2 through the first return pipe 11, where it is filtered and sterilized alone or together with the water supplied by water supply pipe 1. This filtration and sterilization cycle continues until the first detection device 4 detects that the water quality meets the standard. When a user has a water demand, the water stored in the water storage device 6 flows into the second detection device 7, which tests the water quality output from the water storage device 6. If the water quality meets the standard, the control device 9 controls the second three-way valve 12 to connect the second detection device 7 and the outlet pipe 8, and the outlet pipe 8 delivers the water to different users for use. Conversely, if the water quality does not meet the standard, the control device 9 controls the second three-way valve 12 to connect the second detection device 7 and the second return pipe 13, and the water supply pump 5 returns the non-compliant water to the front end of the ultrafiltration device 2 through the second return pipe 13, where it is filtered and sterilized alone or together with the raw water supplied by the water supply pipe 1. This filtration and sterilization process is continuously repeated until the second detection device 7 detects that the water quality meets the standard. As can be seen, this utility model can perform multi-stage filtration and effective disinfection of the incoming water through the ultrafiltration device 2 and the sterilization device 3, removing impurities, microorganisms and other harmful substances from the water and ensuring the quality of the water supply. The first detection device 4 and the second detection device 7 can monitor the water quality at different stages in real time. The control device 9 can intelligently control the return pipeline according to the detection results. When the water quality does not meet the standards, the water is returned to the ultrafiltration device 2 for reprocessing. This cycle of filtration and disinfection of the water body avoids the situation where the water in the storage tank is contaminated or the water is not fully filtered and disinfected before being supplied to the user, thereby effectively ensuring that the final water quality meets the standards and improving the safety and reliability of the water supply.

[0032] The aforementioned sterilization device 3 can use UV LEDs to disinfect and sterilize water by using ultraviolet light, eliminating bacteria, viruses, and other microorganisms. The aforementioned first three-way valve 10 and second three-way valve 12 can be existing electric three-way regulating valves. The aforementioned control device 9 can be an existing controller.

[0033] See Figure 1As shown, in one embodiment of the ultrafiltration device 2, the ultrafiltration device 2 includes a quartz sand filter tank 14, an activated carbon filter tank 15, and an ultrafiltration membrane module 16 connected in sequence. Thus, the quartz sand filter tank 14 can initially filter large particulate impurities in the water, the activated carbon filter tank 15 can adsorb harmful substances such as odors and residual chlorine in the water, and the ultrafiltration membrane module 16 can further intercept tiny particles and bacteria. Through three-stage filtration, the water quality is gradually improved, providing a higher quality water source for subsequent disinfection and water supply.

[0034] See Figure 1 and Figure 2 As shown, based on the above embodiment, the secondary water supply equipment with filtration and disinfection functions further includes a chemical tank 17 and a dosing pump 18. The inlet of the dosing pump 18 is connected to the chemical tank 17. The outlet of the dosing pump 18 is connected between the activated carbon filter tank 15 and the ultrafiltration membrane module 16 via a third three-way valve 19. The chemical tank 17 is used to store the scale inhibitor solution. The dosing pump 18 is used to pump the scale inhibitor solution in the chemical tank 17 into the ultrafiltration membrane module 16. The output of the control device 9 is also electrically connected to the third three-way valve 19 and the dosing pump 18. The control device 9 is also used to control the opening or closing of the dosing pump 18, and to control the third three-way valve 19 to connect the ultrafiltration membrane module 16 and the activated carbon filter tank 15 or the dosing pump 18. Thus, the third three-way valve 19 is connected to the ultrafiltration membrane module 16 and the activated carbon filter tank 15 by default. When the ultrafiltration membrane module 16 is saturated with impurities, the control device 9 controls the third three-way valve 19 to connect the ultrafiltration membrane module 16 and the dosing pump 18, and controls the dosing pump 18 to open. At this time, the dosing pump 18 pumps the scale inhibitor into the ultrafiltration membrane module 16, adsorbs and removes impurities from the ultrafiltration membrane module 16, effectively preventing calcium and magnesium ions in the water from scaling on the surface of the ultrafiltration membrane, thereby extending the service life of the ultrafiltration membrane and reducing equipment maintenance costs.

[0035] The aforementioned third three-way valve 19 can use an existing electric three-way regulating valve.

[0036] See Figure 1 and Figure 2 As shown, based on the above embodiment, the outlet of the dosing pump 18 is connected to the inlet of the ultrafiltration membrane module 16 via a dosing pipe 20. A flow meter 21 is installed on the dosing pipe 20. The input of the control device 9 is also electrically connected to the flow meter 21. Thus, the flow meter 21 can monitor the flow rate of the scale inhibitor in the dosing pipe 20 in real time and feed the data back to the control device 9. Based on the flow information, the control device 9 can precisely control the dosing pump 18 and the third three-way valve 19 to ensure accurate dosing of the scale inhibitor, further optimize the dosing effect, and guarantee the normal operation of the ultrafiltration membrane.

[0037] See Figure 1 and Figure 2As shown, in one embodiment of the water storage device 6, the water storage device 6 includes at least two parallel water storage tanks 22. Each water storage tank 22 has a first control valve 23 at its inlet and a second control valve 24 at its outlet. The output of the control device 9 is also electrically connected to the first control valve 23 and the second control valve 24. The control device 9 is also used to control the opening or closing of the first control valve 23 and the second control valve 24. Thus, by using at least two parallel water storage tanks 22, the water storage device 6 can increase the water storage capacity and improve the stability of the water supply. Furthermore, by intelligently controlling the control valves at the inlet and outlet of each water storage tank 22, the control device 9 can flexibly allocate the use of each water storage tank 22 according to actual water demand and the water level of each tank, simultaneously or individually using at least two tanks 22 to achieve reasonable water storage and supply.

[0038] Both the first control valve 23 and the second control valve 24 mentioned above can be existing solenoid valves.

[0039] See Figure 1 and Figure 2 As shown, based on the above embodiment, a level gauge 25 is installed inside the water storage tank 22. A water supply switch valve 26 is installed on the water supply pipe 1. The input terminal of the control device 9 is also electrically connected to the level gauge 25, and the output terminal of the control device 9 is also electrically connected to the water supply switch valve 26 and the water supply pump 5. The level gauge 25 is used to detect the water level in the water storage tank 22 and send it to the control device 9. The control device 9 is also used to receive the water level signal generated by the level gauge 25, compare it with the set water level line, and control the opening or closing of the water supply switch valve 26 and the water supply pump 5 according to the comparison result. In this way, the level gauge 25 can monitor the water level in the water storage tank 22 in real time, and the control device 9 automatically controls the opening or closing of the water supply switch valve 26 and the water supply pump 5 according to the water level information compared with the set water level line. When the water level in any water storage tank 22 is lower than the minimum water level setting value, the control device 9 opens the water supply switch valve 26 and the water supply pump 5 to replenish water to the water storage tank 22 until the water level is close to the maximum water level setting value, and then closes the water supply switch valve 26 and the water supply pump 5 to realize automatic control of the water level in the water storage tank 22, so as to avoid the water supply effect of the secondary water supply equipment being affected by the water level being too high or too low.

[0040] The aforementioned water supply switch valve 26 can use an existing solenoid valve.

[0041] See Figure 1As shown, based on any of the above embodiments, the outlet ends of the first return pipe 11 and the second return pipe 13 are connected to a return main pipe 27 via a tee. The outlet end of the return main pipe 27, the outlet end of the water supply pipe 1, and the inlet end of the ultrafiltration device 2 are connected via a tee. One-way valves 28 are installed at both the outlet ends of the first return pipe 11 and the second return pipe 13. Thus, the return main pipe 27 allows the water from the first return pipe 11 and the second return pipe 13 to be centrally returned to the ultrafiltration device 2, simplifying the piping structure. The one-way valves 28 prevent backflow, ensuring that the returned water only flows to the ultrafiltration device 2, avoiding impact on other components, thereby ensuring the normal operation of the secondary water supply equipment.

[0042] See Figure 1 As shown, in one embodiment of the first detection device 4 and the second detection device 7, both the first detection device 4 and the second detection device 7 include a pH meter 29, a hardness meter 30, and a TDS sensor 31. The pH meter 29 is used to detect the pH value of the water. The hardness meter 30 is used to detect the hardness value of the water. The TDS sensor 31 is used to detect the TDS value of the water. Thus, the pH meter 29, the hardness meter 30, and the TDS sensor 31 can respectively detect important water quality indicators such as acidity / alkalinity, hardness, and total dissolved solids. By comprehensively detecting these indicators, the water quality status can be assessed more comprehensively and accurately, providing a more reliable basis for the control device 9 to determine whether the water quality meets the standards, and further improving the safety of the water supply.

[0043] The pH meter 29, hardness meter 30 and TDS sensor 31 of the first detection device 4 and the second detection device 7 are all electrically connected to the input terminal of the control device 9. The pH meter 29, hardness meter 30 and TDS sensor 31 can all use existing pH meters, hardness meters and TDS sensors.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A secondary water supply device with filtration and disinfection functions, characterized in that, include: The system comprises a water supply pipe, an ultrafiltration device, a sterilization device, a first detection device, a water supply pump, a water storage device, a second detection device, and an outlet pipe, connected sequentially along the water inlet direction. The water supply pump and the water storage device are connected by a first three-way valve to a first return pipe, and the second detection device and the outlet pipe are connected by a second three-way valve to a second return pipe. The outlet ends of both the first and second return pipes are connected to the water inlet of the ultrafiltration device. Both the first and second detection devices are used to detect whether the water quality meets the standards. The control device has an input terminal electrically connected to the first detection device and the second detection device, and an output terminal electrically connected to the first three-way valve and the second three-way valve. The control device is used to control the first three-way valve to connect the water supply pump and the water storage device or the first return pipe according to the detection result of the first detection device, and to control the second three-way valve to connect the second detection device and the water outlet pipe or the second return pipe according to the detection result of the second detection device.

2. The secondary water supply apparatus having a filter sterilization function according to claim 1, characterized by, The ultrafiltration device includes a quartz sand filter tank, an activated carbon filter tank, and an ultrafiltration membrane module connected in sequence.

3. The secondary water supply equipment with filtration and disinfection function according to claim 2, characterized in that, The secondary water supply equipment with filtration and disinfection functions also includes a chemical tank and a dosing pump. The inlet of the dosing pump is connected to the chemical tank, and the outlet of the dosing pump is connected between the activated carbon filter tank and the ultrafiltration membrane module through a third three-way valve. The chemical tank is used to store scale inhibitor solution, and the dosing pump is used to pump the scale inhibitor solution in the chemical tank into the ultrafiltration membrane module. The output of the control device is also electrically connected to the third three-way valve and the dosing pump. The control device is also used to control the opening or closing of the dosing pump, and to control the third three-way valve to connect the ultrafiltration membrane module and the activated carbon filter tank or the dosing pump.

4. The secondary water supply equipment with filtration and disinfection function according to claim 3, characterized in that, The outlet of the dosing pump is connected to the inlet of the ultrafiltration membrane module via a dosing pipe. A flow meter is installed on the dosing pipe, and the input of the control device is also electrically connected to the flow meter.

5. The secondary water supply equipment with filtration and disinfection function according to any one of claims 1-4, characterized in that, The water storage device includes at least two water storage tanks connected in parallel. Each water storage tank is provided with a first control valve and a second control valve at its inlet and outlet ends, respectively. The output end of the control device is also electrically connected to the first control valve and the second control valve. The control device is also used to control the opening or closing of the first control valve and the second control valve.

6. The secondary water supply equipment with filtration and disinfection function according to claim 5, characterized in that, The water storage tank is equipped with a level gauge, and the water supply pipe is equipped with a water supply switch valve. The input end of the control device is also electrically connected to the level gauge, and the output end of the control device is also electrically connected to the water supply switch valve and the water supply pump. The level gauge is used to detect the water level in the water storage tank and send it to the control device. The control device is also used to receive the water level signal generated by the level gauge and compare it with the set water level line. Based on the comparison result, the control device controls the opening or closing of the water supply switch valve and the water supply pump.

7. The secondary water supply equipment with filtration and disinfection function according to any one of claims 1, 2, 3, 4 and 6, characterized in that, The outlet ends of the first return pipe and the second return pipe are connected to a return main pipe via a tee. The outlet end of the return main pipe, the outlet end of the water supply pipe, and the inlet end of the ultrafiltration device are connected via a tee. Both the outlet ends of the first return pipe and the second return pipe are equipped with a check valve.

8. The secondary water supply equipment with filtration and disinfection function according to claim 7, characterized in that, Both the first and second detection devices include a pH meter, a hardness meter, and a TDS sensor. The pH meter is used to detect the pH value of the water, the hardness meter is used to detect the hardness value of the water, and the TDS sensor is used to detect the TDS value of the water.

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