Noise reduction device and water purification apparatus

Abstract

The application relates to a noise reduction device and a water purification equipment, and is applied to the field of the water purification equipment. The device comprises a first flow channel and a second flow channel. The first flow channel has a water inlet section and a water outlet section which can communicate with each other. The second flow channel is connected between the water inlet section and the water outlet section, and comprises a water inlet hole for connecting with the water inlet section and a water outlet hole for connecting with the water outlet section. The flow passage cross-sectional area of the water inlet hole and / or the water outlet hole is smaller than that of the second flow channel. The water inlet hole and the water outlet hole with small flow passage cross-sectional areas are arranged at the head and tail of the second flow channel. When the high-pressure water flows through the water inlet hole and is throttled, the water enters the second flow channel with a larger flow passage cross-sectional area, and a low-pressure high-speed water flow is formed. The water flow collides with the water flow remaining in the second flow channel to reduce the water flow speed, and the first pressure relief is realized. When the water flow is throttled again through the water outlet hole, the inlet pressure is significantly reduced, the generation of howling is inhibited from the noise source, the overall noise reduction is achieved, and the use sense of the user is improved.

Description

Technical Field

[0001] This application relates to the technical field of water purification equipment, and in particular to a noise reduction device and water purification equipment. Background Technology

[0002] The wastewater pipe of the water purifier is equipped with a wastewater valve to control the discharge of wastewater. The wastewater valve has an inlet channel, an outlet channel, and a wastewater channel. When the wastewater valve is in the working state, the wastewater channel connects the inlet channel and the outlet channel to discharge wastewater; when the wastewater valve is in the flushing state, the inlet channel is directly connected to the outlet channel, allowing a large flow of water to directly flush the wastewater valve.

[0003] In related technologies, regardless of the flow rate, the wastewater valve's wastewater orifice is typically constructed as a long, narrow pipe or small hole, directly connecting the inlet and outlet of the wastewater valve. During operation, high-pressure water flows directly into the inlet and is discharged directly to the outlet through the wastewater orifice. During operation, the high-pressure water flowing through the small hole of the wastewater valve produces a whistling sound, resulting in significant noise and affecting the user's experience. Utility Model Content

[0004] Therefore, it is necessary to provide a noise reduction device and a water purification equipment to address the problem that the wastewater valve causes significant noise during operation, affecting the user's sensory experience.

[0005] In a first aspect, this application provides a noise reduction device, which adopts the following technical solution:

[0006] A noise reduction device has a first flow channel and a second flow channel. The first flow channel has an inlet section and an outlet section that are interconnected. The second flow channel is connected between the inlet section and the outlet section and includes an inlet hole for connecting to the inlet section and an outlet hole for connecting to the outlet section. The flow cross-sectional area of ​​the inlet hole and / or the outlet hole is smaller than the flow cross-sectional area of ​​the second flow channel.

[0007] In one embodiment, the noise reduction device includes a valve body and a valve core, wherein the first flow channel and the second flow channel are arranged in parallel and located within the valve body, and the valve core is disposed within the first flow channel.

[0008] In one embodiment, the water inlet is located on the side wall of the water inlet section, the water outlet is located on the side wall of the water outlet section, and the opening direction of the water inlet and / or the water outlet is set at an angle to the extension direction of the first flow channel.

[0009] In one embodiment, the second flow channel is curved.

[0010] In one embodiment, the second flow channel is arranged in a "C" shape; or, the second flow channel is arranged in a spiral shape; or, the second flow channel is arranged in an "S" shape.

[0011] In one embodiment, the distance between the inlet and the outlet is less than the extension length of the second flow channel.

[0012] In one embodiment, the noise reduction device includes a first valve body having the water inlet section and a second valve body having the water outlet section, the first valve body and the second valve body being connected in series to form a first flow channel, and the second flow channel being located within the first flow channel; wherein, the water inlet section is provided with a first valve core having the water inlet hole, the water outlet section is provided with a second valve core having the water outlet hole, and the water inlet hole and the water outlet hole define the second flow channel within the first flow channel.

[0013] In one embodiment, the opening direction of the water inlet and / or the water outlet is arranged parallel to the extension direction of the first flow channel.

[0014] In one embodiment, the flow cross-sectional area of ​​the first flow channel is greater than or equal to the flow cross-sectional area of ​​the second flow channel.

[0015] Secondly, this application provides a water purification device, which adopts the following technical solution:

[0016] A water purification device includes a composite filter element, a booster pump, and the aforementioned noise reduction device. The composite filter element includes at least a fine filter element, the inlet of which is connected to municipal tap water, and the outlet of which is used to output purified water. The booster pump is located upstream of the inlet of the fine filter element for pressurizing. The noise reduction device is located downstream of the wastewater outlet of the fine filter element for discharging wastewater. A second flow channel is connected to the wastewater outlet of the fine filter element.

[0017] The aforementioned noise reduction device, through the setting of inlet and outlet holes with small flow cross-sectional areas at both ends of the second flow channel, allows high-pressure water to enter the second flow channel with a larger flow cross-sectional area after being throttled through the inlet holes, forming a low-pressure, high-speed water flow. This water flow collides with the water flow remaining in the second flow channel to reduce the flow velocity, achieving the first pressure relief. Subsequently, when the water flow is throttled a second time through the outlet holes, the inlet pressure has been significantly reduced, thereby suppressing the generation of howling noise from the source and achieving overall noise reduction, thus improving the user's sensory experience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the water circuit when the noise reduction device is in the filtering state in one embodiment of this application.

[0019] Figure 2This is a schematic diagram of the water path when the noise reduction device is in the rinsing state according to one embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the water circuit of the noise reduction device in another embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the water circuit of a water purification device in one embodiment of this application.

[0022] Attached image annotations:

[0023] 1. Noise reduction device; 11. First flow channel; 111. Inlet section; 1111. Inlet; 112. Outlet section; 1121. Outlet; 12. Second flow channel; 121. Inlet hole; 122. Outlet hole; 13. Valve body; 14. Valve core; 21. Filter unit; 22. Fine filter element; 3. Booster pump; 4. Raw water impurity detection device; 5. Pure water impurity detection device; 6. High-pressure switch; 7. Inlet tee; 8. Solenoid valve; 9. Check valve; 15. First valve body; 151. First valve core; 16. Second valve body; 161. Second valve core. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0025] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0026] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0030] The following is in conjunction with the appendix Figure 1-3 The embodiments of this application will be described in further detail.

[0031] See Figure 1 and Figure 2 As shown, Figure 1 This illustration shows a water circuit diagram when the noise reduction device is in filtration mode according to one embodiment of this application. Figure 2A schematic diagram of the water circuit is shown in the flushing state of a noise reduction device according to an embodiment of this application. The filtration state is the operating state of the noise reduction device when discharging wastewater; the flushing state is the operating state when a large flow of water directly flushes the entire device.

[0032] One embodiment of this application provides a noise reduction device 81, specifically a wastewater valve applied to a water purification device. The technical solution shown in this embodiment is mainly based on improvements to the internal structure of existing wastewater valves to achieve noise reduction. The noise reduction device 81 includes a valve body 13 and a valve core 14 disposed within the valve body 13. The valve body 13 has a first flow channel 11 and a second flow channel 12 inside. Both the first flow channel 11 and the second flow channel 12 are used to transport wastewater. The valve core 14 is installed within the first flow channel 11 and is used to control the opening and closing of the first flow channel 11, while the second flow channel 12 is normally open.

[0033] In this embodiment, the valve core 14 can specifically be a diaphragm and a switching element installed in the first flow channel 11. The valve core 14 has an open state and a closed state to control the switching of the first flow channel 11 between the open and closed states.

[0034] See Figure 1 As shown, Figure 1 The hollow arrow in the diagram indicates the flow direction of water inside the valve body 13 when the noise reduction device 81 is in the filtration state. When the noise reduction device 81 is in the filtration state, the valve core 14 switches to the closed state. At this time, the first flow channel 11 is blocked, and wastewater can only flow out of the valve body 13 through the second flow channel 12.

[0035] Combination Figure 2 As shown, Figure 2 The hollow arrow in the diagram indicates the flow direction of water inside the valve body 13 when the noise reduction device 81 is in the flushing state. When the valve core 14 is switched to the open state, the first flow channel 11 is opened, and water can flow out of the valve body 13 through the first flow channel 11 and the second flow channel 12 at the same time to realize the cleaning operation of the water purification equipment.

[0036] Specifically, the first flow channel 11 has an inlet section 111 and an outlet section 112 respectively located on both sides of the valve core 14. The end of the inlet section 111 away from the outlet section 112 forms an inlet 1111 of the noise reduction device 81, and the end of the outlet section 112 away from the inlet section 111 forms an outlet 1121 of the noise reduction device 81. The second flow channel 12 connects the inlet section 111 and the outlet section 112, and specifically includes an inlet hole 121 connected to the inlet section 111 and an outlet hole 122 connected to the outlet section 112. The flow cross-sectional area of ​​the inlet hole 121 and / or the outlet hole 122 is smaller than the flow cross-sectional area of ​​the second flow channel 12, so that the water pressure is reduced after the water flows through the second flow channel 12.

[0037] Continue reading Figure 1 As shown, an inlet hole 121 is located on the side wall of the inlet section 111, and an outlet hole 122 is located on the side wall of the outlet section 112. The opening directions of the inlet hole 121 and / or the outlet hole 122 are arranged at an angle to the extension direction of the first flow channel 11. In this embodiment, the opening directions of both the inlet hole 121 and the outlet hole 122 are perpendicular to the extension direction of the first flow channel 11.

[0038] When the noise reduction device 81 is in the filtration state, firstly, when the water flow (wastewater) flowing through the valve body 13 passes through the inlet hole 121, the flow cross-sectional area at the inlet hole 121 is smaller than that at the inlet section 111, resulting in a sharp increase in flow velocity (jet effect). When the high-pressure water flows through the inlet hole 121, the pressure drops sharply due to the increased flow velocity. At the same time, the local resistance generated at the inlet hole 121 causes eddies and energy loss, which further reduces the pressure of the water flow at the inlet hole 121, thus forming a high-speed, low-pressure jet at the outlet of the inlet hole 121.

[0039] Then, the water flows into the second channel 12, which has a larger flow cross-sectional area, through the inlet hole 121. Since there is a certain amount of water in the second channel 12, the incoming water collides with the original water flow to achieve buffering and energy release, and the flow velocity decreases. Since the flow cross-sectional area of ​​the outlet hole 122 is smaller than that of the second channel 12, some of the kinetic energy of the water flow is converted into pressure energy, and the water pressure rises. However, due to the turbulence and vortex generated by the sudden expansion structure, some energy is dissipated into heat energy, and the water pressure in the second channel 12 does not fully recover. Thus, a low-speed, medium-high pressure water flow is formed in the second channel 12. At this time, the water pressure is lower than the initial inlet pressure.

[0040] Finally, the water flow buffered by the second flow channel 12 flows into the outlet section 112 through the outlet hole 122. The cross-sectional area through which the water supply flows decreases sharply, causing the flow velocity to increase sharply again. The increase in flow velocity causes some of the pressure energy of the water flow to be converted into kinetic energy, and the water pressure drops sharply for the second time. In addition, the local resistance at the outlet hole 122 will generate additional pressure loss, which will reduce the water pressure for the second time. A low-pressure jet is formed at the outlet hole 122, and the water pressure discharged from the outlet hole 122 is much lower than the water pressure discharged from the inlet hole 121 after the second pressure reduction.

[0041] In this embodiment, by setting inlet holes 121 and outlet holes 122 with small flow cross-sectional areas at both ends of the second flow channel 12, the high-pressure water flow is throttled through the inlet holes 121 and then enters the second flow channel 12 with a larger flow cross-sectional area, forming a low-pressure, high-speed water flow. This water flow collides with the water flow remaining in the second flow channel 12 to reduce the flow velocity, thus achieving the first pressure relief. Subsequently, when the water flow is throttled a second time through the outlet holes 122, the inlet pressure has been significantly reduced, thereby suppressing the generation of howling at the noise source and achieving the overall noise reduction effect of the solenoid valve 8, thus improving the user's sensory experience.

[0042] See Figure 2 As shown, the flow cross-sectional area of ​​the first flow channel 11 is larger than that of the second flow channel 12. When the noise reduction device 81 is in the flushing state, the valve core 14 is switched to the open state accordingly, and the water flows in the direction of the hollow arrow in the figure. At this time, the water can pass through both the first flow channel 11 and the second flow channel 12. Since the flow cross-sectional area of ​​the first flow channel 11 is much larger than that of the inlet hole 121 of the second flow channel 12, most of the water flows through the first flow channel 11, and a small portion flows through the second flow channel 12. Finally, all of the water is collected at the outlet 1121 of the noise reduction device 81 and discharged from the valve body 13.

[0043] In some embodiments, the apertures of the inlet hole 121 and the outlet hole 122 are configured to be independently adjustable to accommodate pressure reduction requirements at different flow rates. For example, if the flow rate needs to be increased, the apertures of the inlet hole 121 and / or the outlet hole 122 can be increased; if the flow rate needs to be decreased, the apertures of the inlet hole 121 and / or the outlet hole 122 can be decreased.

[0044] See Figure 1 and Figure 2 As shown, in some embodiments, the distance between the inlet hole 121 and the outlet hole 122 is less than the extension length of the second flow channel 12. It can be understood that by extending the extension length of the second flow channel 12, the flow path of wastewater in the second flow channel 12 is increased, thereby increasing the energy loss during the flow of wastewater and achieving the effect of reducing the flow velocity of wastewater, thus playing a role in buffering and consuming energy of wastewater.

[0045] In some other embodiments, the second flow channel 12 is curved, specifically constructed as a spiral structure or an S-shaped structure. It can be understood that by setting the second flow channel 12 into a curved shape, the flow resistance encountered by the wastewater when flowing in the second flow channel 12 is increased, thereby increasing the energy loss during the flow of wastewater. This can also achieve the effect of reducing the wastewater flow rate and the energy loss of wastewater.

[0046] See Figure 3 As shown, Figure 3 A schematic diagram of the water circuit of a noise reduction device according to another embodiment of this application is shown. Specifically, it is a noise reduction device in which two separate valve bodies are connected in series by a connecting structure to achieve the noise reduction function. In some embodiments, the noise reduction device includes a first valve body 15 having an inlet section 111 and a second valve body 16 having an outlet section 112. The first valve body 15 and the second valve body 16 are connected in series by a connecting structure (not shown) to form a first flow channel 11 through which water flows. A second flow channel 12 is formed in the first flow channel 11, and the flow cross-sectional area of ​​the second flow channel 12 is equal to the flow cross-sectional area of ​​the first flow channel 11.

[0047] Specifically, the inlet section 111 is provided with a first valve core 151 having an inlet hole 121, and the outlet section 112 is provided with a second valve core 161 having an outlet hole 122. In this embodiment, the opening direction of the inlet hole 121 and / or the outlet hole 122 is parallel to the flow direction of the first flow channel 11. The inlet hole 121 and the outlet hole 122 are connected and define a second flow channel 12 within the first flow channel 11.

[0048] Specifically, the first valve core 151 and the second valve core 161 both have an open state and a closed state that can be switched between each other: when the first valve core 151 and the second valve core 161 are both in the closed state, the water flows through the inlet hole 121, the second flow channel 12 and the outlet hole 122 in sequence; when the first valve core 151 and the second valve core 161 are both in the open state, the water flows through the first flow channel 11.

[0049] In this embodiment, the first valve core 151 and the second valve core 161 have the same structure, specifically a diaphragm and a switching element, used to control the flow path of the water passage. In some embodiments, the first valve core 151 and the second valve core 161 can also be common switching elements, without the need for an additional diaphragm.

[0050] See Figure 4 As shown, Figure 4 The diagram shows a water circuit diagram of a water purification device in one embodiment of this application. In some embodiments, this application also provides a water purification device, which includes, but is not limited to, water purifiers, water dispensers, and other water purification devices. The water purification device includes at least a composite filter element, a booster pump 3, and a noise reduction device 81 as shown in any of the above embodiments.

[0051] The composite filter element includes at least a fine filter element 22, which can be an RO filter element, a nanofiltration filter element, or others. After the raw water passes through the fine filter element 22, it becomes pure water. A booster pump 3 is installed upstream of the fine filter element 22 to pressurize the raw water and input it into the fine filter element 22 for filtration. A noise reduction device 81 is installed downstream of the wastewater outlet of the fine filter element 22 to discharge wastewater.

[0052] In some other embodiments, the composite filter element also includes a filtration unit 21 composed of a pre-filter and a post-filter, with the filtration unit 21 and the fine filter 22 spaced apart. During the operation of the water purification equipment, the raw water is filtered by the pre-filter to remove some impurities, forming purified water. The purified water is then filtered by the fine filter 22 to form pure water. The pure water is then filtered by the post-filter to improve its taste, thus meeting the user's drinking water needs.

[0053] For details, please refer to [link / reference]. Figure 4As shown, an inlet tee 7 is provided upstream of the pre-filter in the filter unit 21. The inlet tee 7 is used to connect to municipal tap water. After being treated by the pre-filter, the municipal tap water becomes purified water and enters the fine filter 22 under the pressure of the booster pump 3. After being filtered by the fine filter 22, the purified water becomes pure water and a portion of wastewater. A one-way valve 9 is provided downstream of the outlet of the fine filter 22. The one-way valve 9 connects the outlet of the fine filter 22 and the inlet of the post-filter. Driven by the one-way valve 9, the pure water flows into the post-filter for further filtration, which improves the taste of the pure water and outputs it for users to use. The wastewater is discharged from the water purification equipment through a noise reduction device 81 installed downstream of the wastewater outlet of the fine filter 22.

[0054] In this embodiment, only the pre-filter and post-filter are combined into a filtration unit 21, with the fine filter 22 configured separately, as an example. In other embodiments, the pre-filter, post-filter, and fine filter 22 can also be combined or configured separately. It is understood that a combined configuration means that at least two types of filter elements are located in the same filter bottle, while a separate configuration means that each is located in a separate filter bottle.

[0055] Continue reading Figure 4 As shown, in some embodiments, the water purification device further includes a raw water impurity detector 4 and a pure water impurity detector 5 installed in the water system. The raw water impurity detector 4 is installed downstream of the outlet of the pre-filter cartridge to detect the impurity content of the raw water, and the pure water impurity detector 5 is installed downstream of the outlet of the fine filter cartridge 22 to detect the impurity content of the pure water.

[0056] In some other embodiments, the water purification device also includes a high-pressure switch 6, a solenoid valve 8, and a control unit (not shown) installed in the water system. The control unit is electrically connected to the solenoid valve 8 and the high-pressure switch 6, respectively. In this embodiment, the control unit may specifically be an electronic control board. Specifically, the solenoid valve 8 is installed between the outlet of the pre-filter and the inlet of the booster pump 3 to control the water intake operation of the water purification device. The high-pressure switch 6 is installed downstream of the outlet of the post-filter to detect the water pressure of the water system.

[0057] When the water purification equipment is in use, the user turns on the tap to draw water. The high-pressure switch 6 detects a decrease in water pressure within the water system and sends a water production signal to the control unit. Upon receiving the signal, the control unit opens the solenoid valve 8, allowing municipal tap water to flow into the fine filter cartridge 22 through the inlet tee 7 and solenoid valve 8 for purification. After a period of water production, the high-pressure switch 6 detects an increase in water pressure within the system and sends a stop water production signal to the control unit. Upon receiving this signal, the control unit closes the solenoid valve 8, thus stopping the input of municipal tap water.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A noise reduction device, characterized by, The noise reduction device has: a first flow channel (11) having a water inlet section (111) and a water outlet section (112) capable of communicating with each other; and a second flow channel (12) communicating between the water inlet section (111) and the water outlet section (112) and comprising a water inlet hole (121) for communicating with the water inlet section (111) and a water outlet hole (122) for communicating with the water outlet section (112), the flow area of the water inlet hole (121) and / or the water outlet hole (122) being smaller than the flow area of the second flow channel (12).

2. The noise reducing device of claim 1, wherein, The noise reduction device comprises a valve body (13) and a valve core (14), the first flow channel (11) and the second flow channel (12) are arranged in parallel and located in the valve body (13), and the valve core (14) is arranged in the first flow channel (11).

3. The noise reducing device of claim 2, wherein, The water inlet hole (121) is arranged on the side wall of the water inlet section (111), the water outlet hole (122) is arranged on the side wall of the water outlet section (112), and the water inlet hole (121) and / or the water outlet hole (122) are arranged at an angle between the opening direction and the extension direction of the first flow channel (11).

4. The noise reducing device according to any one of claims 1-3, characterized in that The second flow channel (12) is arranged in a curved manner.

5. The noise reducing device of claim 4, wherein, The second flow channel (12) is arranged in a "C" shape; or, the second flow channel (12) is arranged in a spiral shape; or, the second flow channel (12) is arranged in an "S" shape.

6. The noise reducing device of any one of claims 1-3, wherein, The distance between the water inlet hole (121) and the water outlet hole (122) is smaller than the extension length of the second flow channel (12).

7. The noise reducing device of claim 1, wherein, The noise reduction device comprises a first valve body (15) having the water inlet section (111) and a second valve body (16) having the water outlet section (112), the first valve body (15) and the second valve body (16) are connected in series to form the first flow channel (11), and the second flow channel (12) is located in the first flow channel (11). The first valve core (151) provided with the water inlet hole (121) is arranged in the water inlet section (111), the second valve core (161) provided with the water outlet hole (122) is arranged in the water outlet section (112), and the water inlet hole (121) and the water outlet hole (122) define the second flow channel (12) in the first flow channel (11).

8. The noise reducing device of claim 7, wherein, The opening direction of the water inlet hole (121) and / or the water outlet hole (122) is parallel to the extension direction of the first flow channel (11).

9. The noise reducing device of claim 1, wherein, The flow area of the first flow channel (11) is greater than or equal to the flow area of the second flow channel (12).

10. A water purification apparatus characterized by comprising: The water purification device comprises: a composite filter element comprising at least a fine filter element (22), an inlet of the fine filter element (22) being communicated with municipal tap water, and an outlet of the fine filter element (22) being used for outputting purified water; a booster pump (3) arranged upstream of the inlet of the fine filter element (22) and used for boosting pressure; and The noise reduction device according to any one of claims 1-9 is arranged downstream of the wastewater outlet of the fine filter element (22) and used for discharging wastewater, and the second flow channel (12) is communicated with the wastewater outlet of the fine filter element (22).

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