Medium-pressure ultraviolet sterilization system

Abstract

The utility model discloses a medium-pressure ultraviolet sterilization system. The medium-pressure ultraviolet sterilization system comprises a guide pipe, a water passing cavity for water flow to pass through is formed in the guide pipe, and the inner wall of the water passing cavity is a quartz wall; the medium-pressure ultraviolet lamp is arranged in the water passing cavity; a liquid outlet of the cleaning device is communicated with the water passing cavity, and the cleaning device is used for cleaning the quartz wall; the control valve is arranged at the communicating position of the liquid outlet of the cleaning device and the water passing cavity; the cleaning device is arranged to clean the quartz wall of the water passing cavity, dirt on the quartz wall is reduced, the reflecting capacity of the quartz wall can be effectively guaranteed, and the sterilization effect of ultraviolet rays on water resources is improved.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, specifically, it relates to a medium-pressure ultraviolet sterilization system. Background Technology

[0002] Currently, the vast majority of water treatment plants in my country use chlorination as the sole disinfection method. Chlorination disinfection has certain limitations and instability; for example, it is difficult to control all microorganisms, especially in killing parasites and worms, where it has no significant removal effect.

[0003] Medium-pressure ultraviolet (UV) technology can inactivate various protozoan single-celled bacteria and viruses, including Cryptosporidium and Giardia lamblia, without producing chemical byproducts. Commonly used medium-pressure UV sterilization systems in China employ medium-pressure UV lamps, which generate a broader UV spectrum, thus acting on the entire microorganism, not just damaging its DNA structure. Because this UV technology effectively avoids photoreactivation and dark repair of microbial DNA, it can permanently inactivate microorganisms, which is undoubtedly crucial for drinking water. Furthermore, compared to ozone and chlorine disinfection, medium-pressure UV lamp disinfection kills a wider range of bacteria and has a greater ability to decompose chemicals. It also boasts numerous advantages, including being pollution-free and environmentally friendly; requiring less space and being easy to install and operate; having low operating costs and a long service life; and its sterilization function is unaffected by the environment. To effectively avoid photoreactivation and ensure an effective UV dose, medium-pressure UV disinfection systems have become the preferred disinfection process.

[0004] Existing medium-pressure ultraviolet sterilization systems include conduits that form a water passage cavity inside, with the inner wall of the water passage cavity being a quartz wall. When sewage flows through the water passage cavity for a long time, a large amount of water scale will remain on the quartz wall, reducing the reflectivity of the quartz wall and thus affecting the sterilization effect of ultraviolet light on water resources.

[0005] In view of the above, this utility model is hereby proposed. Utility Model Content

[0006] The technical problem this utility model aims to solve is to overcome the shortcomings of existing technologies and provide a medium-pressure ultraviolet sterilization system. By incorporating a cleaning device to clean the quartz wall of the water passage chamber, the system reduces dirt buildup on the quartz wall, effectively ensuring its reflectivity and improving the sterilization effect of ultraviolet light on water resources. To solve the above technical problem, the basic concept of this utility model is as follows:

[0007] This utility model provides a medium-pressure ultraviolet sterilization system, comprising:

[0008] The conduit has an internal water passage cavity through which water flows, and the inner wall of the water passage cavity is made of quartz.

[0009] The medium-pressure ultraviolet lamp is located inside the water passage cavity;

[0010] The cleaning device has its outlet connected to the water passage chamber and is used to clean the quartz wall.

[0011] The control valve is located at the connection between the liquid outlet and the water passage of the cleaning device.

[0012] Furthermore, the cleaning device includes a storage tank for storing cleaning fluid, a supply pipeline, and a power pump connected in series with the supply pipeline;

[0013] The inlet and outlet of the liquid supply pipeline are connected to the liquid storage tank and the water passage cavity, respectively.

[0014] Furthermore, the conduit extends horizontally, and its two ends along the axial direction are respectively provided with an inlet and an outlet that communicate with the water passage chamber;

[0015] The lower part of the conduit wall is provided with an inlet near the inlet of the conduit and an outlet near the outlet of the conduit;

[0016] The outlet of the liquid supply line is connected to the inlet of the conduit;

[0017] The control valve is located at the inlet of the conduit, and the auxiliary control valve is located at the outlet of the conduit.

[0018] Furthermore, the inlet of the liquid supply line is connected to the outlet of the conduit;

[0019] The power pump is a circulating pump;

[0020] The storage tank and the circulation pump are connected in series on the liquid supply pipeline along the direction of liquid flow.

[0021] Furthermore, the interior of the water passage cavity is equipped with at least one medium-pressure ultraviolet lamp;

[0022] When there are two or more medium-pressure ultraviolet lamps inside the water passage chamber, the two or more medium-pressure ultraviolet lamps are distributed along the axial direction of the conduit from the water inlet to the water outlet.

[0023] The inlet of the conduit is located between the water inlet of the conduit and the medium-pressure ultraviolet lamp at the beginning, and the outlet of the conduit is located between the water outlet of the conduit and the medium-pressure ultraviolet lamp at the end.

[0024] Furthermore, an observation hole is provided above the peripheral wall of the catheter to observe the internal condition of the water passage cavity;

[0025] The observation port is located between the water inlet of the guide tube and the medium-pressure ultraviolet lamp at the head end.

[0026] Furthermore, the interior of the water passage cavity is equipped with a detection unit, which includes a transmittance sensor, an ultraviolet light intensity sensor, and a temperature sensor;

[0027] The transmittance sensor, ultraviolet light intensity sensor, and temperature sensor are respectively located between the medium-pressure ultraviolet lamp at the front end and the medium-pressure ultraviolet lamp at the rear end.

[0028] Furthermore, a junction box is provided between the two medium-pressure ultraviolet lamps, near the water inlet of the conduit;

[0029] The junction box is connected to the transmittance sensor, ultraviolet light intensity sensor and temperature sensor respectively via wires.

[0030] Furthermore, the inlet and outlet of the conduit are respectively provided with an inlet flange and an outlet flange that are coaxially arranged with the conduit;

[0031] An inlet control valve is installed at the inlet flange, and an outlet control valve is installed at the outlet flange;

[0032] Adjust the opening and closing states of the control valve and auxiliary control valve according to the opening and closing states of the inlet control valve and the outlet control valve.

[0033] Furthermore, the medium-pressure ultraviolet lamp is installed inside the duct along the direction perpendicular to the fluid flow, and a ballast is connected to the medium-pressure ultraviolet lamp independently of the duct.

[0034] The outer wall of the catheter has two protrusions. Each protrusion is hollow inside to form a connector cavity that communicates with the water passage cavity. The two ends of the medium-pressure ultraviolet lamp are inserted into the corresponding connector cavities.

[0035] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art.

[0036] By installing a cleaning device to clean the quartz wall of the water passage chamber, the amount of dirt on the quartz wall can be reduced, which can effectively ensure the reflectivity of the quartz wall and improve the sterilization effect of ultraviolet light on water resources.

[0037] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0038] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of the medium-pressure ultraviolet sterilization system provided in an embodiment of the present invention;

[0040] Figure 2 A schematic diagram showing the positions of the inlet control valve and the outlet control valve provided in this embodiment of the utility model.

[0041] Icons: 1-Conduit; 11-Water passage chamber; 111-Quartz wall; 12-Observation port; 2-Medium-pressure ultraviolet lamp; 21-Medium-pressure ultraviolet lamp at the beginning; 22-Medium-pressure ultraviolet lamp at the end; 3-Cleaning device; 31-Storage tank; 32-Supply pipeline; 33-Power pump; 34-Circulation pump; 4-Control valve; 5-Auxiliary control valve; 6-Detection unit; 61-Transmittance sensor; 62-Ultraviolet light intensity sensor; 63-Temperature sensor; 7-Gathering box; 8-Inlet flange; 9-Outlet flange; 10-Pretreatment unit; 10a-Reverse osmosis unit; 110-Inlet control valve; 120-Outlet control valve.

[0042] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0044] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] like Figure 1 As shown, this utility model provides a medium-pressure ultraviolet sterilization system, comprising:

[0047] The conduit 1 has a water passage cavity 11 inside through which water flows, and the inner wall of the water passage cavity 11 is a quartz wall 111.

[0048] Medium-pressure ultraviolet lamp 2 is located inside the water passage cavity 11;

[0049] The cleaning device 3 has its outlet connected to the water passage chamber 11 and is used to clean the quartz wall 111.

[0050] Control valve 4 is located at the connection between the liquid outlet of the cleaning device 3 and the water passage chamber 11.

[0051] In the embodiments of this utility model, by setting a cleaning device 3 to clean the quartz wall 111 of the water passage cavity 11, the dirt on the quartz wall 111 is reduced, which can effectively ensure the reflectivity of the quartz wall 111 and improve the sterilization effect of ultraviolet light on water resources.

[0052] The outlet of the cleaning device 3 is connected to the water passage chamber 11. By periodically or as needed, cleaning fluid is sprayed onto the quartz wall 111 to thoroughly clean it and prevent dirt from adhering to it. The control valve 4 precisely controls the flow rate and spraying time of the cleaning fluid, ensuring the cleaning process is both effective and economical. Simultaneously, it can quickly shut off the cleaning device 3 when necessary, avoiding interference with normal water flow.

[0053] In an embodiment of this utility model, the cleaning device 3 includes a storage tank 31 for storing cleaning fluid, a supply pipeline 32, and a power pump 33 connected in series with the supply pipeline 32.

[0054] The inlet and outlet of the liquid supply pipeline 32 are connected to the liquid storage tank 31 and the water passage 11, respectively.

[0055] In this embodiment of the invention, the liquid supply pipeline 32 connects the liquid storage tank 31 and the water passage chamber 11, and is responsible for transporting the cleaning liquid from the liquid storage tank 31 to the water passage chamber 11 to clean the quartz wall 111. The power pump 33 is connected in series with the liquid supply pipeline 32 to provide the pressure required for the flow of the cleaning liquid, thereby enabling automatic cleaning of the quartz wall 111.

[0056] Specifically, the conduit 1 extends horizontally, and the two ends of the conduit 1 along the axis are respectively provided with an inlet and an outlet that communicate with the water passage chamber 11;

[0057] The lower part of the periphery of the conduit 1 is provided with an inlet near the water inlet of the conduit 1 and an outlet near the water outlet of the conduit 1;

[0058] The outlet of the liquid supply line 32 is connected to the inlet of the conduit 1;

[0059] Control valve 4 is located at the inlet of conduit 1, and auxiliary control valve 5 is located at the outlet of conduit 1.

[0060] Both the inlet and outlet of the conduit 1 shaft are connected to the water passage chamber 11, allowing water to flow smoothly in and out. On the lower part of the conduit 1's perimeter wall, near the inlet, is a liquid inlet for receiving cleaning fluid; near the outlet, is a liquid outlet for discharging cleaning fluid. A control valve 4 is located at the liquid inlet of the conduit 1 to precisely control the flow rate and spraying time of the cleaning fluid. An auxiliary control valve 5 is located at the liquid outlet of the conduit 1 to regulate or shut off the discharge of cleaning fluid, ensuring the effectiveness and economy of the cleaning process. The coordinated operation of these two control valves 4 makes the cleaning process more flexible and controllable.

[0061] When the quartz wall 111 needs to be cleaned, the control valve 4 is opened, and the cleaning fluid enters the water chamber 11 through the supply line 32 to clean the quartz wall 111; after cleaning, the control valve 4 is closed and the auxiliary control valve 5 is opened to drain the cleaning fluid.

[0062] Furthermore, the inlet of the liquid supply line 32 is connected to the outlet of the conduit 1;

[0063] Power pump 33 is a circulation pump 34;

[0064] The liquid storage tank 31 and the circulation pump 34 are connected in series on the liquid supply pipeline 32 along the direction of liquid flow in the liquid supply pipeline 32.

[0065] The inlet of the liquid supply line 32 is connected to the outlet of the conduit 1, and the outlet of the liquid supply line 32 is connected to the inlet of the conduit 1, so that the liquid supply line 32 can recycle the cleaning liquid; the circulation pump 34 serves as a power source to drive the cleaning liquid to circulate within the liquid supply line 32.

[0066] Specifically, at least one medium-pressure ultraviolet lamp 2 is provided inside the water passage cavity 11;

[0067] When the interior of the water passage cavity 11 is equipped with two or more medium-pressure ultraviolet lamps 2, the two or more medium-pressure ultraviolet lamps are distributed along the axial direction of the conduit 1 from the water inlet to the water outlet.

[0068] The inlet of the conduit 1 is located between the water inlet of the conduit 1 and the medium-pressure ultraviolet lamp 21 at the beginning, and the outlet of the conduit 1 is located between the water outlet of the conduit 1 and the medium-pressure ultraviolet lamp 22 at the end.

[0069] Two or more medium-pressure ultraviolet lamps are distributed along the axial direction of the conduit 1 from the inlet to the outlet. This arrangement ensures that the water is fully irradiated by ultraviolet light as it flows through the entire water passage 11, thereby achieving efficient sterilization and disinfection.

[0070] The purpose of setting the inlet and outlet of conduit 1 in this way is to increase the cleaning area of ​​the quartz wall 111.

[0071] It should be noted that the two or more medium-pressure ultraviolet lamps 2 are distributed along the axial direction of the conduit 1, rather than arranged in a row along the axial direction of the conduit 1. Since all the medium-pressure ultraviolet lamps 2 are distributed from the inlet of the conduit 1 to the outlet of the conduit 1, the one closest to the inlet of the conduit 1 is the first medium-pressure ultraviolet lamp 21, and the one closest to the outlet of the conduit 1 is the last medium-pressure ultraviolet lamp 22.

[0072] Specifically, the medium-pressure ultraviolet lamp 2 is installed in the conduit 1 along the direction perpendicular to the fluid flow, and a ballast is connected to the medium-pressure ultraviolet lamp 2 that is independent of the conduit 1.

[0073] The outer wall of the conduit 1 has two protrusions. Each protrusion is hollow inside to form a connection cavity that communicates with the water passage cavity 11. The two ends of the medium-pressure ultraviolet lamp 2 are respectively inserted into the corresponding connection cavities.

[0074] The medium-pressure ultraviolet lamp 2 is positioned perpendicular to the fluid flow direction within the water passage cavity 11. This arrangement ensures that the water flow is fully exposed to ultraviolet radiation, thereby improving sterilization efficiency. Both ends of the medium-pressure ultraviolet lamp 2 are inserted into the insertion cavities formed by two protrusions on the outer peripheral wall of the conduit 1. This insertion method not only facilitates the installation and removal of the medium-pressure ultraviolet lamp 2 but also ensures a tight seal between it and the water passage cavity 11. A ballast, independent of the conduit 1, is connected to the medium-pressure ultraviolet lamp 2. The ballast stabilizes the operating voltage and current of the medium-pressure ultraviolet lamp 2, ensuring its continuous and stable emission of ultraviolet light. The ballast is not shown in the figure.

[0075] In an embodiment of this utility model, an observation hole for observing the internal condition of the water passage cavity 11 is provided above the periphery of the conduit 1.

[0076] The observation hole is located between the water inlet of the guide tube 1 and the medium-pressure ultraviolet lamp 21 at the head end.

[0077] In this embodiment of the invention, an observation hole is specially provided on the upper part of the periphery of the conduit 1 for observing the internal condition of the water passage chamber 11. This design allows the operator to intuitively understand the internal condition of the water passage chamber 11, including the working status of the medium-pressure ultraviolet lamp 2, the flow state of the water, and whether cleaning is required. The observation hole is specifically located between the water inlet of the conduit 1 and the medium-pressure ultraviolet lamp 21 at the beginning. This position allows the operator to conveniently observe the entire internal condition of the water passage chamber 11 from one side of the conduit 1.

[0078] In this embodiment of the present invention, a detection unit 6 is provided inside the water passage cavity 11. The detection unit 6 includes a transmittance sensor 61, an ultraviolet light intensity sensor 62, and a temperature sensor 63.

[0079] The transmittance sensor 61, the ultraviolet light intensity sensor 62, and the temperature sensor 63 are respectively located between the medium-pressure ultraviolet lamp 21 at the front end and the medium-pressure ultraviolet lamp 22 at the rear end.

[0080] In this embodiment of the present invention, the system achieves real-time monitoring and precise control of the water flow sterilization process by setting a detection unit 6 inside the water passage cavity 11.

[0081] The detection unit 6 includes a transmittance sensor 61, an ultraviolet light intensity sensor 62, and a temperature sensor 63. These sensors are used to monitor key parameters such as the water transmittance, ultraviolet light intensity, and water temperature inside the water chamber 11.

[0082] The transmittance sensor 61, the ultraviolet light intensity sensor 62, and the temperature sensor 63 are respectively located between the medium-pressure ultraviolet lamp 21 at the front end and the medium-pressure ultraviolet lamp 22 at the rear end. This arrangement ensures that the sensors can accurately reflect the state changes of the water flow when it passes through the area irradiated by the medium-pressure ultraviolet lamp 2.

[0083] The transmittance sensor 61 is used to monitor the transmittance of the water flow to determine whether there are too many impurities or suspended matter in the water. These impurities may affect the penetration effect of ultraviolet rays. If there are too many impurities or suspended matter in the water, the controller in the system can automatically adjust the working state of the medium-pressure ultraviolet lamp 2 to enhance the ultraviolet intensity and ensure the sterilization effect.

[0084] The ultraviolet light intensity sensor 62 is used to monitor the intensity of ultraviolet light emitted by the medium-pressure ultraviolet lamp 2 to ensure that it achieves the expected sterilization effect. If the ultraviolet light intensity is insufficient, the controller in the system can automatically adjust the working status of the medium-pressure ultraviolet lamp 2 or issue an alarm signal.

[0085] Temperature sensor 63 is used to monitor the water temperature inside the water chamber 11, as changes in water temperature may affect the sterilization effect of ultraviolet light. By monitoring the water temperature in real time, the controller in the system can automatically adjust the working state of the medium-pressure ultraviolet lamp 2 to ensure that the best sterilization effect is achieved under different water temperature conditions.

[0086] It should be noted that the medium-pressure ultraviolet lamp 2, transmittance sensor 61, ultraviolet light intensity sensor 62 and temperature sensor 63 of this application are all located inside the water passage cavity 11 and cannot be seen from the outside. Therefore, the medium-pressure ultraviolet lamp 2, transmittance sensor 61, ultraviolet light intensity sensor 62 and temperature sensor 63 marked in the figure are their respective locations.

[0087] Furthermore, a junction box 7 is provided between the two medium-pressure ultraviolet lamps 2, near the water inlet of the conduit 1;

[0088] Junction box 7 is connected to transmittance sensor 61, ultraviolet light intensity sensor 62 and temperature sensor 63 respectively via wires.

[0089] The main function of junction box 7 is to serve as the electrical connection point for various sensors. It contains terminals for connecting wires, allowing the transmittance sensor 61, ultraviolet light intensity sensor 62, and temperature sensor 63 to be easily connected to junction box 7 via wires.

[0090] Through junction box 7, these sensors can transmit the real-time monitored data signals to the system controller, thereby enabling precise monitoring of water quality and the working status of medium-pressure ultraviolet lamp 2.

[0091] In the embodiments of this utility model, the inlet and outlet of the conduit 1 are respectively provided with an inlet flange 8 and an outlet flange 9 coaxially arranged with the conduit 1.

[0092] There are 8 inlet control valves 110 on the inlet flange and 9 outlet control valves 120 on the outlet flange;

[0093] Adjust the opening and closing states of control valve 4 and auxiliary control valve 5 according to the opening and closing states of inlet control valve 110 and outlet control valve 120.

[0094] In this embodiment of the invention, the design of the inlet flange 8 and the outlet flange 9 allows the conduit 1 to be easily connected to other pipes or equipment, and also facilitates disassembly and maintenance. An inlet control valve 110 is provided at the inlet flange 8 to control the inflow of water; an outlet control valve 120 is provided at the outlet flange 9 to control the outflow of water.

[0095] Based on the opening and closing states of the inlet control valve 110 and the outlet control valve 120, the opening and closing states of other control valves 4 can be adjusted to achieve normal operation and cleaning maintenance of the system.

[0096] In normal operating mode, the inlet control valve 110 is opened, and the water flows into the water passage chamber 11 through the inlet. After being irradiated by each medium-pressure ultraviolet lamp 2 in sequence, the water flows out from the outlet, and the outlet control valve 120 remains open.

[0097] When the quartz wall 111 needs cleaning, close the inlet control valve 110 and the outlet control valve 120, and simultaneously open the circulation pump 34, control valve 4, and auxiliary control valve 5 to start the cleaning program. The cleaning solution enters the water passage chamber 11 through the supply line 32 to clean the quartz wall 111. After cleaning, close the control valve 4 and the auxiliary control valve 5, and reopen the inlet control valve 110 and the outlet control valve 120. The system then returns to normal operating mode.

[0098] like Figure 2As shown, for example, in water treatment, the conduit 1 can be connected in series with the pretreatment unit 10 and the reverse osmosis unit 10a to achieve multi-stage treatment of sewage; the inlet flange 8 provided on the conduit 1 is connected to the pretreatment unit 10 through the first pipeline, and the outlet flange 9 provided on the conduit 1 is connected to the reverse osmosis unit 10a through the second pipeline; wherein, the inlet control valve 110 is provided on the first pipeline near the inlet flange 8, and the outlet control valve 120 is provided on the second pipeline near the outlet flange 9.

[0099] It should be noted that the control valve 4, auxiliary control valve 5, inlet control valve 110 and outlet control valve 120 involved in this application can be opened manually or automatically through the controller in the system.

[0100] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A medium-pressure ultraviolet sterilization system, characterized in that, include: The conduit has an internal water passage cavity through which water flows, and the inner wall of the water passage cavity is made of quartz. The medium-pressure ultraviolet lamp is located inside the water passage cavity; The cleaning device has its outlet connected to the water passage chamber and is used to clean the quartz wall. A control valve is located at the connection between the liquid outlet and the water passage chamber of the cleaning device. The cleaning device includes a storage tank for storing cleaning fluid, a supply pipeline, and a power pump connected in series with the supply pipeline. The storage tank and the circulation pump are connected in series on the liquid supply pipeline along the direction of liquid flow. The conduit extends horizontally, and its two ends along the axial direction are respectively provided with an inlet and an outlet that communicate with the water passage chamber; The lower part of the conduit wall is provided with an inlet near the inlet of the conduit and an outlet near the outlet of the conduit; The inlet of the liquid supply line is connected to the outlet of the conduit, and the outlet of the liquid supply line is connected to the inlet of the conduit. The control valve is located at the inlet of the conduit, and the auxiliary control valve is located at the outlet of the conduit. The interior of the water passage chamber is equipped with at least one medium-pressure ultraviolet lamp; When there are two or more medium-pressure ultraviolet lamps inside the water passage chamber, the two or more medium-pressure ultraviolet lamps are distributed along the axial direction of the conduit from the water inlet to the water outlet. The inlet of the conduit is located between the water inlet of the conduit and the medium-pressure ultraviolet lamp at the beginning, and the outlet of the conduit is located between the water outlet of the conduit and the medium-pressure ultraviolet lamp at the end. The inlet and outlet of the guide pipe are respectively equipped with an inlet flange and an outlet flange that are coaxially arranged with the guide pipe; An inlet control valve is installed at the inlet flange, and an outlet control valve is installed at the outlet flange; Adjust the opening and closing states of the control valve and auxiliary control valve according to their respective opening and closing states. Closed state; The inlet flange is connected to the pretreatment unit via the first pipeline, and the outlet flange is connected to the reverse osmosis unit via the second pipeline; the inlet control valve is located on the first pipeline near the inlet flange, and the outlet control valve is located on the second pipeline near the outlet flange.

2. The medium-pressure ultraviolet sterilization system according to claim 1, characterized in that, An observation hole is provided on the upper part of the catheter wall to observe the inside of the water passage cavity; The observation port is located between the water inlet of the guide tube and the medium-pressure ultraviolet lamp at the head end.

3. The medium-pressure ultraviolet sterilization system according to claim 1, characterized in that, The water passage cavity is equipped with a detection unit, which includes a transmittance sensor, an ultraviolet light intensity sensor, and a temperature sensor. The transmittance sensor, ultraviolet light intensity sensor, and temperature sensor are respectively located between the medium-pressure ultraviolet lamp at the front end and the medium-pressure ultraviolet lamp at the rear end.

4. The medium-pressure ultraviolet sterilization system according to claim 3, characterized in that, A junction box is located between the two medium-pressure ultraviolet lamps, near the water inlet of the conduit; The junction box is connected to the transmittance sensor, ultraviolet light intensity sensor and temperature sensor respectively via wires.

5. The medium-pressure ultraviolet sterilization system according to any one of claims 1-4, characterized in that, The medium-pressure ultraviolet lamp is installed inside the conduit along the direction perpendicular to the fluid flow, and a ballast is connected to the medium-pressure ultraviolet lamp independently of the conduit. The outer wall of the catheter has two protrusions. Each protrusion is hollow inside to form a connector cavity that communicates with the water passage cavity. The two ends of the medium-pressure ultraviolet lamp are inserted into the corresponding connector cavities.

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