Nozzle assembly, oral irrigator and manufacturing method of nozzle assembly

Abstract

The invention discloses a nozzle assembly, a water pick and a manufacturing method of the nozzle assembly. The nozzle assembly comprises a nozzle and a flow guide part, the nozzle comprises a main flow section, a limiting section and a flow guide section, the flow guide section is arranged on the downstream of the limiting section, the main flow section is arranged on the upstream of the limiting section, the flow guide section is provided with a first flow channel and a second flow channel which are communicated, and the second flow channel is located on the downstream of the first flow channel. The flow guide part is arranged in the flow channel of the flow guide section, and the flow guide part is limited in the first flow channel through the limiting section and the second flow channel together. Under the condition that water flows into the first flow channel, the flow guide part can play a certain guiding role on the water flow, so that the cleaning effect of the water flow ejected from the second flow channel on teeth is relatively good. Besides, the limiting section can play a role in limiting the flow guide part, so that the flow guide part can be stably mounted in the first flow channel, additional elements for fixing the flow guide part are not needed, and the structure of the nozzle assembly is relatively simple.

Description

Technical Field

[0001] The present application relates to the technical field of oral irrigators, and more specifically, to a nozzle assembly, an oral irrigator, and a method for manufacturing the nozzle assembly. Background Art

[0002] Oral irrigators are widely recognized as an important oral cleaning tool. They effectively clean the gum sulcus and interdental spaces, removing impurities that are difficult to remove with traditional toothbrushes. They also effectively clean various crevices, holes, and uneven surfaces on the tooth surface. The water jet from an oral irrigator also massages the gums, promoting blood circulation and enhancing local tissue resistance to disease. However, current oral irrigators lack the impact of the liquid ejected from the nozzle, and the liquid's flow pattern is relatively monotonous, resulting in poor cleaning results. Summary of the Invention

[0003] The embodiments of the present application provide a nozzle assembly, an oral irrigator, and a method for manufacturing the nozzle assembly, which are at least used to solve the problem that the guide piece in the current oral irrigator nozzle requires additional components to fix it in the nozzle.

[0004] The nozzle assembly of the embodiment of the present application includes a nozzle and a guide member. The nozzle includes a main flow section and a guide section. The nozzle includes a main flow section, a restriction section and a guide section. The guide section is arranged downstream of the restriction section, and the main flow section is arranged upstream of the restriction section. The guide section is provided with a first flow channel and a second flow channel that are connected. The second flow channel is located downstream of the first flow channel. The guide member is arranged in the flow channel of the guide section. The restriction section and the second flow channel jointly restrict the guide member to the first flow channel.

[0005] In some embodiments, the limiting section is deformed by at least one of stretching, bending, flattening, and necking after heat treatment, so that the limiting section can limit the guide member within the first flow channel.

[0006] In some embodiments, the restriction section is provided with a third flow channel, and a diameter of a flow surface of the third flow channel near an outlet of the first flow channel is smaller than a diameter of a circumscribed circle of the flow guide.

[0007] In some embodiments, a diameter of a flow surface of the second flow channel near an inlet of the first flow channel is smaller than a diameter of a circumscribed circle of the flow guide.

[0008] In some embodiments, the diameter of at least part of the flow surface of the first flow channel is larger than the diameter of the circumscribed circle of the guide member, and the length of the first flow channel in the direction of liquid flow in the nozzle is larger than the length of the guide member.

[0009] In some embodiments, the guide section is bent relative to the main section, the main section is provided with a main flow channel, and the angle between the extension direction of the first flow channel and the extension direction of the main flow channel is in the range of [100°, 145°].

[0010] In certain embodiments, in the direction of liquid flow in the nozzle, the area of at least a portion of the flow surface of the first flow channel is configured to gradually decrease.

[0011] In some embodiments, the guide section is further provided with a fourth flow channel. In the direction of liquid flow in the nozzle, the first flow channel, the fourth flow channel and the second flow channel are connected and communicated in sequence, and the guide member is configured to make the area of the flow surface of the fluid in the fourth flow channel larger than the area of the flow surface before entering the fourth flow channel. In the direction of liquid flow in the nozzle, the area of the flow surface of the fourth flow channel is configured to gradually decrease, and the area of the flow surface of the second flow channel is smaller than the area of the flow surface of the first flow channel.

[0012] In some embodiments, the contraction angle of the fourth flow channel ranges from [30° to 180°].

[0013] In certain embodiments, in the direction of liquid flow in the nozzle, the area of the flow surface of the second flow channel is configured to gradually increase.

[0014] In some embodiments, the expansion angle of the second flow channel ranges from [0° to 15°].

[0015] In some embodiments, the guide member includes an impeller, which includes at least one blade group and a guide column. The guide column extends along the direction of liquid flow in the nozzle, and the blade group is arranged on the outer peripheral wall of the guide column. The blade group is used to form a spiral liquid flow.

[0016] In some embodiments, the blade assembly includes a plurality of blades, each blade including an end away from an outer peripheral wall of the guide column, and a buffer is provided on the end.

[0017] In some embodiments, the guide column includes a column body and a guide portion, the column body is closer to the second flow channel than the guide portion, and the cross-sectional area of the guide portion gradually increases in the direction of liquid flow in the nozzle.

[0018] In some embodiments, the diameter of the column is less than or equal to 0.5D, where D is the diameter of the inner wall of the first flow channel.

[0019] In some embodiments, the blade group includes multiple blades; the impeller includes multiple blade groups, and the multiple blade groups are arranged at intervals in the extension direction of the guide column; or, the impeller includes one blade group, and the blades in the blade group extend from one end of the column of the guide column to the other end of the column.

[0020] In some embodiments, the blade assembly includes a plurality of blades, and the plurality of blades are evenly distributed on the outer peripheral wall of the guide column.

[0021] In some embodiments, the blade assembly includes a plurality of blades, and an extension direction of the blades is consistent with an extension direction of the guide column.

[0022] In some embodiments, the blade assembly includes a plurality of blades, and an extension direction of the blades is obliquely connected to an extension direction of the guide column.

[0023] In some embodiments, the blade assembly includes a plurality of blades, and the blades extend spirally compared to the extension direction of the guide column.

[0024] In some embodiments, the length L of the impeller ranges from [5d, 10d], where d is the diameter of the middle position of the guide column.

[0025] In some embodiments, the blade assembly includes a plurality of blades, and the thickness of the blades is less than or equal to 0.3d, where d is the diameter of the middle position of the guide column.

[0026] In some embodiments, when there are multiple blade groups, the width of the blades in the extension direction of the guide column has a value range of [0.5d, 2.0d], where d is the diameter of the middle position of the guide column.

[0027] In certain embodiments, the minimum diameter of the second flow channel is less than or equal to 1.0 mm.

[0028] In certain embodiments, the flow guide is configured to cause the area of the flow surface of the fluid in the first flow channel to decrease, increase, decrease, and increase in sequence in the direction of liquid flow in the nozzle.

[0029] The oral irrigator of the embodiment of the present application includes a body and the nozzle assembly described in the above embodiment, and the nozzle assembly is connected to the body.

[0030] In the manufacturing method of the nozzle assembly of the embodiment of the present application, the nozzle assembly includes a nozzle and a guide member, the nozzle includes a first section, a second section and a third section, the second section connects the first section and the third section, the first section is provided with a main channel, the third section is provided with a first channel and a second channel, and the second channel is located downstream of the first channel; the manufacturing method includes: placing the guide member from the main channel to the first channel; and changing the shape of the second section by heat treatment so that the second section can confine the guide member within the first channel.

[0031] In certain embodiments, pressurized gas is blown into the main flow channel from an inlet end thereof away from the first flow channel, so that the flow guide is maintained at an outlet end of the first flow channel away from the main flow channel.

[0032] In some embodiments, the changing of the shape of the second section by heat treatment so that the second section can confine the guide member within the first flow channel includes: after the second section is heat treated, bending the second section by at least one of stretching, bending, clamping, and necking so that the second section can confine the guide member within the first flow channel.

[0033] In the nozzle assembly, water flosser, and method for manufacturing the nozzle assembly according to the embodiments of the present application, the guide member is installed in the first flow channel. When a user uses the nozzle assembly, water flows through the main flow channel, the first flow channel, and the second flow channel in sequence and is ejected into the user's oral cavity. When the water flows into the first flow channel, the guide member can guide the water flow to a certain extent, so that the water ejected from the second flow channel has a better cleaning effect on the teeth. In addition, when the guide member is installed in the first flow channel, the restriction section can restrict the guide member, so that the guide member can be stably installed in the first flow channel. No additional components are required to fix the guide member, and the structure of the nozzle assembly is relatively simple.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 is a three-dimensional schematic diagram of a water flosser according to certain embodiments of the present application;

[0037] Figure 2 is a perspective schematic diagram of a nozzle assembly according to certain embodiments of the present application;

[0038] Figure 3 yes Figure 2 A cross-sectional schematic diagram of a nozzle assembly;

[0039] Figure 4 yes Figure 3 An enlarged schematic diagram of the nozzle assembly at IV-IV;

[0040] Figure 5 yes Figure 3 An enlarged schematic diagram of the nozzle assembly at IV-IV;

[0041] Figure 6 is a perspective schematic diagram of a flow guide of a nozzle assembly in some embodiments;

[0042] Figure 7 is a schematic perspective view of a flow guide of a nozzle assembly in other embodiments;

[0043] Figure 8 is a perspective schematic diagram of a flow guide of a nozzle assembly in still other embodiments;

[0044] Figure 9 is a flow chart of a method for manufacturing a nozzle assembly according to certain embodiments of the present application;

[0045] Figure 10 is a flow chart of a method for manufacturing a nozzle assembly according to certain embodiments of the present application.

[0046] Description of main component symbols:

[0047] 1000, oral irrigator; 100, nozzle assembly; 300, fuselage; 10, nozzle; 11, main flow section; 111, main flow channel; 13, guide section; 131, first flow channel; 133, second flow channel; 135, fourth flow channel; 15, restriction section; 151, third flow channel; 30, guide member; 31, impeller; 311, blade assembly; 3111, blade; 3113, buffer member; 313, guide column; 3131, column; 3133, guide portion. DETAILED DESCRIPTION

[0048] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the direction or position relationship.

[0050] The orientation or position relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0052] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0053] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0055] As an important oral cleaning tool, the water flosser is widely recognized by people. Using the water flosser can effectively clean the gingival sulcus and the gaps between teeth, remove impurities that are difficult to remove with a traditional toothbrush, and effectively clean various gaps, holes and uneven surfaces on the surface of the teeth. The water jetted by the water flosser also has a massage effect on the gums, which can promote the blood circulation of the gums and enhance the disease resistance of local tissues. However, the impact force of the liquid ejected from the nozzle of the current water flosser is poor, and the flow form of the liquid is relatively simple, resulting in a poor cleaning effect on the teeth. In order to solve this problem, an embodiment of the present application provides a nozzle assembly 100 ( Figure 2 As shown) and oral irrigator 1000 ( Figure 1 shown).

[0056] See also Figure 1 The oral irrigator 1000 of the embodiment of the present application includes a nozzle assembly 100 and a body 300, and the nozzle assembly 100 is connected to the body 300.

[0057] Among them, the fuselage 300 is used to provide liquid to the nozzle assembly 100. A pump body and a liquid storage space are usually provided in the fuselage 300. When the oral irrigator 1000 is started, the pump body delivers the liquid in the liquid storage space to the nozzle assembly 100. The liquid stored in the liquid storage space can be clean water. The fuselage 300 can usually be provided with buttons such as switches and mode selections. Users can choose the appropriate mode and water flow intensity according to their needs to achieve the best cleaning effect. Preferably, the fuselage 300 can also be equipped with a display area, which can display information such as power level and mode in real time, so that users can understand the status of the oral irrigator 1000.

[0058] When a user uses oral irrigator 1000, nozzle assembly 100 directly contacts the oral cavity, spraying high-pressure water from body 300 into the oral cavity. The fine jet of water from nozzle assembly 100 can penetrate deep into difficult-to-clean areas such as the gaps between teeth and the gum sulcus, removing food debris and plaque, effectively preventing and improving oral health. Furthermore, the water jetting onto the gums acts as a massage, promoting blood circulation and alleviating bleeding and swelling.

[0059] Preferably, the nozzle assembly 100 is detachably connected to the body 300 to facilitate maintenance and replacement of the nozzle assembly 100 and / or the body 300. The detachable connection method includes but is not limited to a snap connection, a threaded connection or a screw connection.

[0060] See also Figures 2 to 4 The nozzle assembly 100 of the embodiment of the present application includes a nozzle 10 and a flow guide 30. The nozzle 10 includes a main flow section 11, a restriction section 15, and a flow guide section 13. The flow guide section 13 is located downstream of the restriction section 15, and the main flow section 11 is located upstream of the restriction section 15. The flow guide section 13 is provided with a first flow channel 131 and a second flow channel 133. The second flow channel 133 is located downstream of the first flow channel 131. The flow guide 30 is provided in the flow channel of the flow guide section 13. The restriction section 15 and the second flow channel 133 jointly confine the flow guide 30 in the first flow channel 131. The diameter of the flow surface of the main flow channel 111 is larger than the diameter of the circumscribed circle of the flow guide 30, and the diameter of the flow surface of the second flow channel 133 near the entrance of the first flow channel 131 is smaller than the diameter of the circumscribed circle of the flow guide 30.

[0061] Specifically, see Figure 2 and Figure 3 The nozzle 10 is used to spray the clean water in the body 300 into the user's mouth in the form of a thin water line to clean the user's teeth, tooth gaps, gingival sulcus and other locations. The material of the nozzle 10 includes but is not limited to plastic, silicone or metal. In the case where the material of the nozzle 10 is plastic, the nozzle 10 is light in weight, low in cost, and easy to process. In the case where the material of the nozzle 10 is silicone, the nozzle 10 is relatively soft, has good elasticity, and will not harm oral tissue. In the case where the material of the nozzle 10 is metal, the nozzle 10 has high strength, long service life, and is easy to clean and maintain. The material of the nozzle 10 in the embodiment of the present application is plastic, and the plastic nozzle 10 can be softened after heating, so that the nozzle 10 can be bent to form the main stream section 11 and the guide section 13.

[0062] The diversion section 13 of the present application is bent relative to the main flow section 11. The main flow section 11 is provided with a main flow channel 111. The main flow section 11 is used to allow clean water within the body 300 to flow through. When a user uses the oral irrigator 1000, the water in the liquid storage space of the body 300 flows through the main flow section 11 and the diversion section 13 and is ejected into the user's oral cavity to clean areas such as the gaps between teeth and the gingival sulcus. The main flow section 11 can be a linear cylindrical structure. It is understood that a linear cylinder here refers to a cylinder with a straight central axis. The main flow channel 111 within the main flow section 11 is also a linear flow channel, and the flow area at each position of the main flow channel 111 can be equal. As a result, when the water flows within the main flow channel 111, turbulence is less likely to occur, and energy loss of the water flow is reduced. In addition, the linear main flow channel 111 is easier to process and produce than a curved flow channel, which can improve the yield rate of the nozzle 10 during production and reduce the production cost of the nozzle 10.

[0063] See also Figures 2 to 4 When the user uses the oral irrigator 1000, the guide section 13 penetrates deeper into the user's oral cavity than the main flow section 11, and water flows out of the guide section 13 and is sprayed to clean areas such as the gaps between teeth and the gingival sulcus. The guide section 13 is bent relative to the main flow section 11. On the one hand, the guide section 13 can penetrate deeper into the oral cavity, corresponding to areas such as the gaps between teeth and the gingival sulcus that need to be cleaned, and when using the nozzle assembly 100, the user does not need to significantly adjust the posture of the arm, which facilitates comprehensive cleaning of the oral cavity. On the other hand, it can stably install the guide member 30 in the first flow channel 131. The bend between the main flow section 11 and the guide section 13 can play a certain role in limiting the guide member 30, thereby preventing the guide member 30 in the first flow channel 131 from shifting to the main flow channel 111 or falling out of the main flow channel 111.

[0064] When the user uses the water flosser 1000, the outlet position of the guide section 13 is aligned with the place that needs to be cleaned (for example, the gaps between teeth or the gingival sulcus, etc.). The water flow in the water storage space of the body 300 flows through the main channel 111, the first channel 131 and the second channel 133, and is sprayed toward the position in the oral cavity that needs to be cleaned to remove dental plaque and food debris in the oral cavity. The diameters of the flow surfaces at various positions of the first channel 131 can be the same or different. The diameters of the flow surfaces at various positions of the second channel 133 can be the same or different. Preferably, the diameter of the flow surface of the second channel 133 is smaller, so that the water flow ejected from the second channel 133 can be concentrated in a specific area, thereby more effectively and deeply cleaning the gaps between teeth or the gingival sulcus, etc.

[0065] See also Figure 3 and Figure 4, the guide member 30 is located in the first flow channel 131. The guide member 30 includes but is not limited to a guide plate, a porous medium and an impeller 31. In one embodiment, the guide member 30 can be fixedly installed in the first flow channel 131. In another embodiment, the guide member 30 is located in the first flow channel 131 and can move in the first flow channel 131. The guide member 30 can play a certain guiding role in the water flow entering the first flow channel 131. Exemplarily, the guide member 30 can change the spray direction of the water flow. For example, in the process of water flow passing through the guide member 30, the guide member 30 can increase the radial and tangential speeds of the water flow and increase the spray area of the water flow, so that the water flow ejected from the second flow channel 133 has a better cleaning effect on the tooth gap or gingival sulcus and other locations.

[0066] Preferably, when the water flows through the first flow channel 131, the flow guide 30 can cause the water flow to form a cavitation effect, thereby further improving the cleaning effect of the water flow ejected from the nozzle 10 on locations such as the gaps between teeth or the gingival sulcus. Specifically, the basic principle of the cavitation water jet is that the water flow ejected from the nozzle 10 induces the formation of cavitation bubbles filled with water vapor inside the nozzle 10, and the distance between the nozzle 10 and the surface of the impacted object (such as the teeth, gaps between teeth and the gingival sulcus) is appropriately adjusted to allow these cavitation bubbles to grow and compress. When the water flow impacts the surface of the object, the cavitation bubble bursts. Due to the micro-jet impact and shock wave impact generated when the cavitation bubble bursts, the energy is highly concentrated and confined to a very small area, thereby generating extremely high impact pressure and stress concentration in areas such as the teeth, gaps between teeth and the gingival sulcus, thereby being able to quickly destroy the dental plaque on the tooth surface, gaps between teeth and the gingival sulcus, and the water flow has a better cleaning effect on the oral cavity. The erosion effect of this local pressure increase and energy concentration on the tooth gaps and gingival sulci makes the cleaning effect of cavitation jet much better than that of non-cavitation jet at the same pump pressure and flow rate.

[0067] When the diameter of the flow surface of the main channel 111 is greater than the diameter of the circumscribed circle of the flow guide 30, that is, the flow area at each position of the main channel 111 is greater than the area of the circumscribed circle of the flow guide 30. The flow area at each position of the main channel 111 is greater than the area of the circumscribed circle of some positions of the flow guide 30, and the flow area at each position of the main channel 111 may also be greater than the area of the circumscribed circle of all positions of the flow guide 30. Preferably, the flow area at each position of the main channel 111 is greater than the area of the circumscribed circle of all positions of the flow guide 30, so that when the guide section 13 is not bent compared to the main flow section 11, the flow guide 30 can smoothly pass through the main channel 111 and enter the first flow channel 131. After the guide member 30 enters the first flow channel 131, the guide section 13 can be bent compared to the main flow section 11. The bending point between the guide section 13 and the main flow section 11 can limit the guide member 30, thereby preventing the guide member 30 located in the first flow channel 131 from moving into the main flow channel 111. The guide member 30 can be stably located in the first flow channel 131.

[0068] When the diameter of the flow surface of the second flow channel 133 near the entrance of the first flow channel 131 is smaller than the diameter of the circumscribed circle of the flow guide 30, that is, the flow area of the second flow channel 133 near the entrance of the first flow channel 131 is smaller than the area of the circumscribed circle of the flow guide 30. The flow area of the second flow channel 133 near the entrance of the first flow channel 131 can be smaller than the area of the circumscribed circle of part of the flow guide 30. In this case, the inner wall of the second flow channel 133 can play a certain role in limiting the flow guide 30, preventing the flow guide 30 from moving into the second flow channel 133 or falling out of the nozzle 10 through the second flow channel 133. The flow area of the second flow channel 133 at the entrance near the first flow channel 131 may be smaller than the area of the circumscribed circle of each position of the guide member 30. At this time, the inner wall of the second flow channel 133 at the entrance near the first flow channel 131 can limit the movement of the guide member 30 from the first flow channel 131 to the second flow channel 133, and the guide member 30 can be stably located in the first flow channel 131.

[0069] In the nozzle assembly 100 of the embodiment of the present application, the flow guide 30 is installed in the first flow channel 131. When a user uses the nozzle assembly 100, water flows sequentially through the main flow channel 111, the first flow channel 131, and the second flow channel 133 and is ejected into the user's oral cavity. When the water flows into the first flow channel 131, the flow guide 30 can play a certain guiding role in the water flow, so that the water ejected from the second flow channel 133 has a better cleaning effect on the teeth. In addition, when the flow guide 30 is installed in the first flow channel 131, the restriction section 15 can restrict the flow guide 30, so that the flow guide 30 can be stably installed in the first flow channel 131. No additional components are required to fix the flow guide 30, and the structure of the nozzle assembly 100 is relatively simple.

[0070] The nozzle assembly 100 will be further described below with reference to the accompanying drawings.

[0071] See also Figures 2 to 4 Furthermore, in some embodiments, the restriction section 15 is provided with a third flow channel 151 , and the diameter of the flow surface of the third flow channel 151 near the outlet of the first flow channel 131 is smaller than the diameter of the circumscribed circle of the guide member 30 .

[0072] One end of the restriction section 15 is connected to the guide section 13, and the other end of the restriction section 15 is connected to the main flow section 11. The main flow section 11, the restriction section 15, and the guide section 13 can be an integral structure or a separate structure. When the main flow section 11, the restriction section 15, and the guide section 13 are an integral structure, the main flow section 11, the restriction section 15, and the guide section 13 can be integrally formed, thereby reducing the assembly steps of the nozzle assembly 100. When the main flow section 11, the restriction section 15, and the guide section 13 are separate structures, the main flow section 11, the restriction section 15, and the guide section 13 can be detachably or non-detachably connected. Removable connection methods include snap-fit connection, threaded connection, or bolt connection, while non-detachable connection methods include gluing connection, hot melt connection, or interference fit connection. When the main flow section 11, the restriction section 15, and the guide section 13 are detachably connected, maintenance and replacement of the main flow section 11, the restriction section 15, or the guide section 13 can be facilitated. The main flow section 11 , the limiting section 15 and the guide section 13 of the present application are an integrated structure.

[0073] See also Figure 3 and Figure 4 , the third flow channel 151 connects the main flow channel 111 and the first flow channel 131. When the oral irrigator 1000 is activated, the water in the water storage space of the body 300 flows through the main flow channel 111, the third flow channel 151, the first flow channel 131 and the second flow channel 133, and is sprayed toward the position in the oral cavity that needs to be cleaned to remove dental plaque and food debris in the oral cavity. When the guide section 13 is not bent compared to the main flow section 11, the diameter of the flow surface of the third flow channel 151 can be equal to the diameter of the flow surface of the main flow channel 111, so that the guide member 30 can smoothly pass through the main flow channel 111 and the third flow channel 151 and enter the first flow channel 131. After the guide member 30 enters the first flow channel 131, the limiting section 15 can bend and deform to cause the guide section 13 to bend compared to the main flow section 11. When the restricting section 15 bends and deforms, the peripheral wall of the third flow channel 151 deforms, thereby reducing the diameter of the flow surface of the third flow channel 151. As a result, the inner wall of the third flow channel 151 can limit the flow guide member 30 in the first flow channel 131 to a certain extent, preventing the flow guide member 30 in the first flow channel 131 from moving into the third flow channel 151. When the flow guide member 30 is stably located in the first flow channel 131, the flow guide member 30 effectively guides the water entering the first flow channel 131.

[0074] In the case where the diameter of the flow surface of the third flow channel 151 near the outlet of the first flow channel 131 is smaller than the diameter of the circumscribed circle of the flow guide 30, the diameter of the third flow channel 151 near the outlet of the first flow channel 131 may be smaller than the diameter of the circumscribed circle at some locations of the flow guide 30, and the diameter of the flow surface of the third flow channel 151 near the outlet of the first flow channel 131 may also be smaller than the diameter of the circumscribed circle at all locations of the flow guide 30. Preferably, the diameter of the third flow channel 151 near the outlet of the first flow channel 131 is smaller than the diameter of the circumscribed circle at all locations of the flow guide 30, and the inner wall of the third flow channel 151 near the outlet of the first flow channel 131 can limit the movement of the flow guide 30 from the first flow channel 131 to the third flow channel 151, so that the flow guide 30 can be stably located in the first flow channel 131.

[0075] In some embodiments, the limiting section 15 is deformed by at least one of stretching, bending, flattening, and necking after heat treatment, so that the limiting section 15 can limit the guide member 30 within the first flow channel 131.

[0076] See also Figure 3 and Figure 4 In some embodiments, the diameter of at least part of the flow surface of the first flow channel 131 is greater than the diameter of the circumscribed circle of the guide member 30, and in the direction of liquid flow in the nozzle 10, the length of the first flow channel 131 is greater than the length of the guide member 30.

[0077] When the diameter of at least part of the flow-through surface of the first flow channel 131 is greater than the diameter of the circumscribed circle of the guide member 30, when the guide member 30 enters the nozzle 10 through the main flow channel 111 and the third flow channel 151, the guide member 30 can smoothly enter the first flow channel 131 and be located in the first flow channel 131.

[0078] If the length of the first flow channel 131 is greater than the length of the flow guide 30 in the direction of liquid flow in the nozzle 10, a certain amount of reserved space remains within the first flow channel 131 after the flow guide 30 is installed in the first flow channel 131. If the restriction section 15 bends and deforms, causing the flow guide section 13 to bend relative to the main flow section 11, the portion of the main flow section 11 and the portion of the flow guide section 13 near the restriction section 15 may slightly deform under the influence of the restriction section 15. With this reserved space within the first flow channel 131, the slight deformation of the flow guide section 13 near the restriction section 15 can prevent the deformation of the flow guide section 13 from affecting the flow guide 30 within the first flow channel 131. Furthermore, if the flow guide 30 is shorter in the direction of liquid flow in the nozzle 10, the obstruction of the flow guide 30 to the water flow can be reduced, reducing water turbulence and energy loss, thereby improving the spraying efficiency and performance of the nozzle 10.

[0079] See also Figure 4 and Figure 5 In some embodiments, the angle a between the extension direction of the first flow channel 131 and the extension direction of the main flow channel 111 ranges from 100° to 145°. For example, the angle a between the extension direction of the first flow channel 131 and the extension direction of the main flow channel 111 can be 100°, 106°, 113°, 117°, 121°, 128°, 132°, 139°, 141°, or 145°.

[0080] When the angle a between the extension direction of the first flow channel 131 and the extension direction of the main flow channel 111 is less than 100°, the turning angle of the water flow is large as the fluid in the main flow channel 111 flows through the third flow channel 151 to the first flow channel 131, resulting in a large energy loss of the water flow. The water flow ejected from the second flow channel 133 has a poor cleaning effect on areas such as the interdental spaces and the gingival sulcus. When the angle a between the extension direction of the first flow channel 131 and the extension direction of the main flow channel 111 is greater than 145°, the bending amplitude of the guide section 13 is smaller than that of the main flow section 11, that is, the degree of bending deformation of the limiting section 15 is smaller, and the inner wall of the third flow channel 151 has a poor effect on limiting the flow guide 30 in the first flow channel 131. The flow guide 30 in the first flow channel 131 may move into the third flow channel 151 and fall off from the nozzle 10 through the main flow channel 111. When the angle a between the extension direction of the first flow channel 131 and the extension direction of the main flow channel 111 is within the range of [100°, 145°], the guide section 13 has a larger bend than the main flow section 11. That is, the degree of bending deformation of the limiting section 15 is greater, and the inner wall of the third flow channel 151 effectively limits the flow guide 30 in the first flow channel 131, thereby preventing the flow guide 30 in the first flow channel 131 from moving into the third flow channel 151. Furthermore, as the fluid in the main flow channel 111 flows through the third flow channel 151 to the first flow channel 131, the turning angle of the water flow is relatively small, resulting in less energy loss. The water flow ejected from the second flow channel 133 has a better cleaning effect on areas such as the gaps between teeth and the gingival sulcus. Furthermore, the bend of the guide section 13 compared to the main flow section 11 can also take into account the dimensions of the teeth, gums, and lips, facilitating the turning and shifting of the nozzle 10 within the mouth, further enhancing the user experience.

[0081] See also Figure 3 and Figure 4In some embodiments, the area of at least a portion of the flow surface of the first flow channel 131 is configured to gradually decrease in the direction of liquid flow in the nozzle 10. In this application, the area of the flow surface of the first flow channel 131 is configured to gradually decrease at all locations in the direction of liquid flow in the nozzle 10. That is, along the direction of liquid flow in the nozzle 10, the flow area of the first flow channel 131 at the end near the third flow channel 151 is larger than the flow area of the first flow channel 131 at the end near the second flow channel 133. The flow area of the first flow channel 131 at the end near the third flow channel 151 is larger than the area of the circumcircle of the flow guide 30, allowing the flow guide 30 to smoothly enter the first flow channel 131. The flow area of the first flow channel 131 at the end near the second flow channel 133 is less than or equal to the area of the circumcircle of the flow guide 30, allowing at least a portion of the inner wall of the first flow channel 131 to form a tight fit with the flow guide 30, allowing the flow guide 30 to be securely installed in the first flow channel 131. Furthermore, in the direction of liquid flow in the nozzle 10, the area of the circumscribed circle of the flow guide 30 also gradually decreases along the length of the flow guide 30. After the flow guide 30 enters the first flow channel 131, the first flow channel 131 can match the outer contour of the flow guide 30, thereby more stably connecting the flow guide 30 with the inner wall of the first flow channel 131. In addition, in the direction of liquid flow in the nozzle 10, if the first flow channel 131 is a tapered channel, as the water flows through the first flow channel 131, the flow area of the first flow channel 131 gradually decreases, allowing the water to flow at a high speed within the first flow channel 131, thereby increasing the flow rate of the water.

[0082] See also Figure 3 and Figure 4 Furthermore, in some embodiments, the guide section 13 is also provided with a fourth flow channel 135. In the direction of liquid flow in the nozzle 10, the first flow channel 131, the fourth flow channel 135 and the second flow channel 133 are connected and communicated in sequence, and the guide member 30 is configured to make the area of the flow surface of the fluid in the fourth flow channel 135 larger than the area of the flow surface before entering the fifth flow channel. In the direction of liquid flow in the nozzle 10, the area of the flow surface of the fourth flow channel 135 is configured to gradually decrease, and the area of the flow surface of the second flow channel 133 is smaller than the area of the flow surface of the first flow channel 131.

[0083] Specifically, the fourth flow channel 135 is a tapered flow channel. When the water flosser 1000 is started, the clean water in the water storage space of the body 300 flows through the main flow channel 111, the third flow channel 151, the first flow channel 131, the fourth flow channel 135 and the second flow channel 133, and is sprayed toward the position in the oral cavity that needs to be cleaned to remove dental plaque and food residues in the oral cavity.

[0084] Because the flow guide 30 is located in the first flow channel 131, the flow area of the water flow is relatively small when the water flows through the first flow channel 131. When the water flows from the second channel into the fourth flow channel 135, the flow area of the water flow increases rapidly. Moreover, since the area of the flow surface of the fourth flow channel 135 is configured to gradually decrease in the direction of liquid flow in the nozzle 10, a Helmholtz oscillation cavity can be formed in the fourth flow channel 135. Specifically, when a stable water flow flows through the outlet contraction section of the resonant cavity (fourth flow channel 135) of the nozzle 10, self-excited pressure excitation is generated, and this pressure excitation is fed back to the resonant cavity (fourth flow channel 135) to form feedback pressure oscillation. By designing the size of the resonance cavity (fourth flow channel 135) and the parameters of the fluid, the frequency of the feedback pressure oscillation can be made equal to the natural frequency of the resonance cavity (fourth flow channel 135), so as to form acoustic harmonic resonance in the resonance cavity, and the fluid ejected from the second flow channel 133 becomes an intermittent vortex ring flow, thereby generating cavitation in the center of the vortex ring. The structure of this intermittent vortex ring flow makes the initial cavitation number of the jet 2 to 6 times higher than that of an ordinary jet, thereby further improving the cleaning effect of the water flow ejected by the nozzle 10 on locations such as the gaps between teeth and the gingival sulcus.

[0085] See also Figure 4 and Figure 5 In some embodiments, the contraction angle b of the fourth flow channel 135 ranges from 30° to 180°. For example, the contraction angle b of the fourth flow channel 135 may be 30°, 46°, 51°, 64°, 75°, 82°, 91°, 122°, 154°, or 180°. When the contraction angle b of the fourth flow channel 135 is less than 30°, the flow area of the second flow channel 133 connected to the fourth flow channel 135 will be larger, so that the pressure and speed of the water flow ejected from the second flow channel 133 will be lower, and the water flow cannot accurately clean the gaps between teeth or the gingival sulcus. As a result, the water flow ejected from the nozzle 10 has a poor cleaning effect on the oral cavity. When the contraction angle b of the fourth flow channel 135 is [30°, 180°], the area of the flow surface of the second flow channel 133 connected to the fourth flow channel 135 is small. When the water flows through the second flow channel 133, the flow rate and pressure of the water flow can be increased, so that the pressure and speed of the water flow ejected from the second flow channel 133 are higher, and the gaps between teeth or gingival sulcus can be cleaned accurately. The nozzle 10 has a better cleaning effect on the oral cavity.

[0086] See also Figure 3 and Figure 4In certain embodiments, the flow guide 30 is configured to cause the area of the flow surface of the fluid in the first flow channel 131 to decrease, increase, decrease, and increase in sequence in the direction of liquid flow in the nozzle 10. At this time, in the process of the water flow flowing through the first flow channel 131, the flow area of the water flow first decreases and then increases. The water flow can form a first Helmholtz oscillation cavity at the position where the flow area increases, thereby enhancing the cavitation effect of the water flow. Then, the water flow once again undergoes the process of decrease and increase in flow area, and forms a second Helmholtz oscillation cavity at the position where the flow area increases. At this time, the cavitation effect of the water flow can also be enhanced, so that the water flow ejected from the nozzle 10 has a better cleaning effect on the gaps between teeth and the gingival sulcus.

[0087] See also Figure 3 and Figure 4 In some embodiments, the area of the flow surface of the second flow channel 133 is configured to gradually increase in the direction of liquid flow in the nozzle 10. On the one hand, the water flows through the fourth flow channel 135 and is ejected from the second flow channel 133 into the oral cavity, which can increase the cavitation effect of the water flow, so that the water flow ejected from the second flow channel 133 has a better cleaning effect on the teeth, the gaps between teeth, and the gingival sulcus. On the other hand, the area of the flow surface of the second flow channel 133 is configured to gradually increase, and the area of the water flow ejected from the second flow channel 133 is larger, so that the contact area between the water flow and the gaps between teeth and the gingival sulcus is larger, and the nozzle 10 has a higher cleaning efficiency for the oral cavity.

[0088] See also Figure 4 and Figure 5 In some embodiments, the expansion angle c of the second flow channel 133 ranges from [0° to 15°]. For example, the expansion angle c of the second flow channel 133 may be 0°, 2°, 5°, 7°, 9°, 11°, 12°, 13°, 14°, or 15°. When the expansion angle c of the second flow channel 133 is greater than 15°, the flow area of the second flow channel 133 is too large, the pressure and speed of the water flow ejected from the second flow channel 133 are relatively low, and the water flow between teeth or the gingival sulcus cannot be accurately cleaned, resulting in poor cleaning effect of the nozzle 10 on the oral cavity. When the expansion angle c of the second flow channel 133 has a value range of [0°, 15°], the area of the flow surface of the second flow channel 133 is small, and the flow rate and pressure of the water flow can be increased when the water flows through the second flow channel 133, so that the pressure and speed of the water flow ejected from the second flow channel 133 are larger, and the speed is higher, and the gaps between teeth or gingival sulcus can be cleaned accurately, and the nozzle 10 has a better cleaning effect on the oral cavity.

[0089] See also Figure 3 and Figure 4In some embodiments, the minimum diameter of the second flow channel 133 is less than or equal to 1.0 mm. Since the second flow channel 133 is a gradually diverging channel, the diameter of the flow surface of the second flow channel 133 at one end close to the fourth flow channel 135 is the smallest, that is, the diameter of the flow surface of the second flow channel 133 at one end close to the fourth flow channel 135 ranges from (0.0 mm to 1.0 mm). For example, the diameter of the flow surface of the second flow channel 133 at one end close to the fourth flow channel 135 can be 0.13 mm, 0.24 mm, 0.35 mm, 0.41 mm, 0.56 mm, 0.64 mm, 0.78 mm, 0.82 mm, 0.96 mm, or 1.0 mm, etc.

[0090] When the diameter of the flow surface of the second flow channel 133 at one end close to the fourth flow channel 135 is greater than 1.0 mm, the area of the flow surface of the second flow channel 133 is too large, the pressure of the water flow ejected from the second flow channel 133 will be relatively small, the speed will be relatively low, and it will be impossible to accurately clean the gaps between teeth or the gingival sulcus, and the nozzle 10 will have a poor cleaning effect on the oral cavity. When the diameter of the flow surface at one end of the second flow channel 133 close to the fourth flow channel 135 is in the range of (0.0mm, 1.0mm], in the process of water flowing through the fourth flow channel 135 into the second flow channel 133, the flow area is sharply reduced, the cavitation effect of the water flow is better, and the water flow has a good cleaning effect on the gaps between teeth and the gingival sulcus. At this time, the diameter of the water flow ejected from the second flow channel 133 is smaller, and the small water flow can penetrate more deeply into the gaps between teeth and the gingival sulcus, removing food debris and dental plaque that are difficult to reach. At the same time, when the diameter of the second flow channel 133 is smaller, the water flow passing through the flow channel with a smaller diameter can generate a higher water flow velocity, thereby enhancing the impact force of the water flow. This impact force helps to remove stains and dental plaque on the surface of the teeth and keep the oral cavity clean and hygienic.

[0091] The current production of nozzles 10 typically prioritizes minimizing the cross-section of the nozzle outlet to create a more impactful, concentrated, columnar jet. The smallest cross-section of the nozzle 10 mold is located on the innermost portion, requiring high strength, making the mold susceptible to damage. In the nozzle assembly 100 of the present application, the cross-section of the nozzle 10 outlet is controlled by the coordination of the inner hole of the second flow channel 133 near the fourth flow channel 135 and the flow guide 30. Furthermore, the flow guide 30 can be manufactured separately, reducing mold complexity and improving production reliability.

[0092] See also Figures 6 to 8In some embodiments, the flow guide 30 includes an impeller 31, which includes at least one blade assembly 311 and a flow guide column 313. The flow guide column 313 extends along the direction of liquid flow in the nozzle 10. The blade assembly 311 is disposed on the outer peripheral wall of the flow guide column 313 and is used to form a spiral liquid flow. In some embodiments, the length L of the impeller 31 is in the range of [5d, 10d], where d is the diameter of the flow guide column 313 at its midpoint.

[0093] The number of blade assemblies 311 can be, but is not limited to, one, two, three, four, or more. The blade assemblies 311 are used to form a spiral flow upon the water entering the first flow channel 131, thereby generating a cavitation effect. The blade assemblies 311 are also used to cause the flow area of the water entering the first flow channel 131 to decrease and then increase within the first flow channel 131, thereby forming a Helmholtz oscillation cavity within the flow guide section 13, thereby enhancing the cavitation effect of the water flow.

[0094] The setting of the guide column 313 can reduce the flow rate in the center of the first flow channel 131, that is, in the process of water flowing into the first flow channel 131, the guide column 313 can make the water flow form an annular cavitation water flow at the outer periphery of the guide column 313, so that the water flow ejected from the nozzle 10 has a better cleaning effect on the oral cavity, and can also increase the spraying area of the water flow.

[0095] See also Figures 6 to 8 Specifically, in some embodiments, blade assembly 311 includes multiple blades 3111 evenly distributed along the outer circumference of guide post 313. Blades 3111 include ends distal from the outer circumference of guide post 313, each end being provided with a buffer. In some embodiments, blade 3111 has a thickness H of less than or equal to 0.3d.

[0096] The number of blades 3111 in each blade assembly 311 includes, but is not limited to, two, three, four, or more. Analysis indicates that increasing the number of blades 3111 increases the contact area between the water flow in the first flow channel 131 and the blades 3111, making the blades 3111 more effective in guiding and swirl the water flow. However, this also increases energy loss in the water flow. Taking into account the cavitation and jet erosion capabilities of the nozzle 10, each blade assembly 311 in the embodiment of the present application includes three blades 3111.

[0097] Please combine Figure 4When the impeller 31 is tightly fitted against the inner wall of the first flow channel 131, the buffer member can deform to a certain extent, thereby ensuring a stable connection between the impeller 31 and the inner wall of the first flow channel 131 and preventing the impeller 31 from separating from the inner wall of the first flow channel 131. Furthermore, the provision of the buffer member can cushion the impact between the impeller 31 and the inner wall of the first flow channel 131, preventing the impeller 31 from scraping against the inner wall of the first flow channel 131, which could shorten the service life of the impeller 31 and the nozzle 10. The buffer member can be made of soft rubber.

[0098] See also Figures 6 to 8 In some embodiments, the guide column 313 includes a column 3131 and a guide portion 3133. The column 3131 is closer to the second flow channel 133 than the guide portion 3133. In the direction of liquid flow in the nozzle 10, the cross-sectional area of the guide portion 3133 gradually increases.

[0099] Please combine Figure 4 The guide portion 3133 is generally conical in structure, with its sharp corner facing the third flow channel 151. The guide portion 3133 is used to guide the water flow from the third flow channel 151 into the first flow channel 131. The guide portion 3133 can guide the water flow from the third flow channel 151 into the first flow channel 131 to the outer periphery of the column 3131, so that the water flow forms an annular cavitation water flow at the outer periphery of the column 3131.

[0100] The column 3131 and the flow guide 3133 can be an integral structure or a separate structure. If the column 3131 and the flow guide 3133 are an integral structure, the column 3131 and the flow guide 3133 can be integrally formed, which can reduce the assembly steps of the impeller 31. If the column 3131 and the flow guide 3133 are separate structures, the column 3131 and the flow guide 3133 can be detachably or non-detachably connected. Removable connection methods include snap-fit connection, threaded connection, or bolt connection, while non-detachable connection methods include gluing, hot melt connection, or interference fit connection.

[0101] See also Figures 5 to 8In some embodiments, the diameter D1 of the cylinder 3131 is less than or equal to 0.5D, where D is the diameter of the inner wall of the first flow channel 131. Exemplarily, when D=5mm, the diameter D1 of the cylinder 3131 is less than or equal to 2.5mm. When D=10mm, the diameter D1 of the cylinder 3131 is less than or equal to 5mm. At this time, the gap between the cylinder 3131 and the inner wall of the first flow channel 131 is large, and when the water flows through the outer periphery of the cylinder 3131, the energy loss of the water flow is small. In addition, in the process of the water flow flowing through the outer periphery of the cylinder 3131, the flow area of the water flow is large, the amount of water flow that forms the cavitation effect per unit time is large, and the nozzle assembly 100 has a high cleaning efficiency for the oral cavity. When the diameter of the column 3131 is greater than 0.5D, the distance between the column 3131 and the inner wall of the first flow channel 131 is small. When the water flows through the outer periphery of the column 3131, the energy loss of the water flow is large, and the nozzle assembly 100 has a poor cleaning effect on the oral cavity.

[0102] See also Figure 6 and Figure 7 In some embodiments, the impeller 31 includes multiple blade assemblies 311 spaced apart in the direction of extension of the guide post 313. This enhances the cavitation effect of the water flow within the first flow channel 131, improving the oral cavity cleaning effect of the nozzle assembly 100. Furthermore, the material used for the blades 3111 is reduced, resulting in a lighter impeller 31 and, consequently, a lighter nozzle assembly 100, making it easier to carry.

[0103] In one example, when the impeller 31 includes two blade groups 311, the two blade groups 311 are spaced apart in the extension direction of the guide column 313. When the water flow from the third flow channel 151 into the first flow channel 131 passes through one blade group 311 and enters the gap between the two blade groups 311, the water flow undergoes a process in which the flow area first decreases and then increases, so that a Helmholtz oscillation cavity can be formed in the gap between the two blade groups 311, where the water flow can enhance the cavitation effect. When the water flow passes through the second blade group 311 and flows into the fourth flow channel 135, the water flow also undergoes a process in which the flow area first decreases and then increases, so that another Helmholtz oscillation cavity can be formed in the fourth flow channel 135, where the water flow can also enhance the cavitation effect, and the water flow ejected from the second flow channel 133 has a better cleaning effect on locations such as the gaps between teeth and the gingival sulcus.

[0104] See also Figure 8In other embodiments, the impeller 31 includes a blade assembly 311, wherein the blades 3111 in the blade assembly 311 extend from one end of the column 3131 of the guide column 313 to the other end of the column 3131. In this case, the structure of the impeller 31 is relatively simple and the processing is relatively convenient. When the water flows from the first flow channel 131 into the fourth flow channel 135, the flow area of the water flow undergoes a process of first decreasing and then increasing, thereby forming a Helmholtz oscillation cavity in the fourth flow channel 135. The water flow can enhance the cavitation effect in this area, and the water flow ejected from the second flow channel 133 has a better cleaning effect on the tooth gaps and gingival sulcus.

[0105] See also Figure 6 In some embodiments, the extension direction of the plurality of blades 3111 is consistent with the extension direction of the guide column 313 ( Figure 6 In this case, the angle between the extension direction of the blade 3111 and the extension direction of the guide post 313 is 0°. The structure of the blade 3111 is relatively simple, and the processing of the impeller 31 is relatively simple. In this embodiment, the impeller 31 may include one or more blade groups 311. In this embodiment of the present application, the impeller 31 includes two blade groups 311 spaced apart from each other in the extension direction of the guide post 313.

[0106] See also Figure 7 In other embodiments, the extension direction of the blade 3111 is obliquely connected to the extension direction of the guide column 313 ( Figure 7 As shown). At this time, the extension direction of the blade 3111 intersects with the extension direction of the guide column 313, and the blade 3111 has a certain deflection angle relative to the guide column 313. In the process of water flowing through the impeller 31, the blade 3111 can guide the water flow, and the water flow can form rotating cavitation in the first flow channel 131. Combined with the pressurization effect of the fourth flow channel 135 (contraction flow channel), a rotating cavitation jet with a high central axial velocity, a large peripheral tangential velocity, and a strong cavitation ability can be formed in the second flow channel 133 (expansion flow channel), so that the water flow ejected from the nozzle assembly 100 has a better cleaning effect on the oral cavity. In this embodiment, the impeller 31 may include one or more blade groups 311. The impeller 31 in this embodiment of the present application includes two blade groups 311 spaced apart from each other in the extension direction of the guide column 313.

[0107] See also Figure 8 In some other embodiments, the blade 3111 extends spirally compared to the extension direction of the guide column 313 ( Figure 8As shown in FIG. 1 , as the water flows through the impeller 31, the blades 3111 can cause the water flow to spiral, forming rotating cavitation within the first flow channel 131. Combined with the pressurization effect of the fourth flow channel 135 (the contraction flow channel), a rotating cavitation jet with high central axial velocity, high peripheral tangential velocity, and strong cavitation capability can be formed in the second flow channel 133 (the expansion flow channel). As a result, the water flow ejected from the nozzle assembly 100 has a better oral cleaning effect. In this embodiment, the impeller 31 may include one or more blade assemblies 311. In this embodiment of the present application, the impeller 31 includes one blade assembly 311.

[0108] See also Figure 6 and Figure 7 In some embodiments, when there are multiple blade groups 311, the width W of the blade 3111 in the extension direction of the guide column 313 ranges from [0.5d, 2.0d], where d is the diameter of the middle position of the guide column 313.

[0109] See also Figure 9 and Figure 10 In the manufacturing method of the nozzle assembly 100 according to the embodiment of the present application, the nozzle assembly 100 includes a nozzle 10 and a flow guide 30. The nozzle 10 includes a first section (main flow section 11), a second section (restriction section 15), and a third section (flow guide section 13). The second section connects the first section and the third section. The first section has a main flow channel 111. The third section has a first flow channel 131 and a second flow channel 133. The second flow channel 133 is located downstream of the first flow channel 131. The manufacturing method includes:

[0110] 01: Place the flow guide 30 from the main flow channel 111 to the first flow channel 131;

[0111] 03: Blow the pressurized gas into the main channel 111 from the inlet end away from the first channel 131 so that the guide member 30 remains at the outlet end of the first channel 131 away from the main channel 111; and

[0112] 05: The shape of the second section is changed by heat treatment so that the second section can confine the guide member 30 within the first flow channel 131.

[0113] In some embodiments, 03: pressurized gas is blown into the main channel 111 from the inlet end away from the first channel 131, so that the guide member 30 is maintained at the outlet end of the first channel 131 away from the main channel 111, including: after the second section is heated, the second section is bent by at least one of stretching, bending, flattening, and necking, so that the second section can confine the guide member 30 within the first channel 131.

[0114] Please combine Figure 3 and Figure 4Preferably, the diameter of the flow-passing surface of the main channel 111 is larger than the diameter of the circumscribed circle of the flow guide 30, so that the flow guide 30 can easily pass through the main channel 111 and enter the first channel 131. In the flow direction of the liquid in the nozzle 10, since the first channel 131 is a tapered channel, when pressurized gas enters the first channel 131 from the main channel 111, the pressurized gas can push the flow guide 30 to move to the outlet end of the first channel 131 away from the main channel 111. At this position, the flow guide 30 can tightly fit with the inner wall of the first channel 131, so that the flow guide 30 can be stably located in the first channel 131. Since the material of the nozzle 10 of the present application is plastic, the plastic can be softened by heating, and the third section can be bent relative to the first section using a clamp. When the third section is bent relative to the first section, the bending portion between the first section and the third section can limit the guide member 30 , thereby preventing the guide member 30 in the first flow channel 131 from moving into the main flow channel 111 .

[0115] The technical features of the above-described embodiments may be combined in any manner. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there are no conflicts in the combination of these technical features, they should be considered to be within the scope of this specification. Furthermore, other implementations can be derived from the above-described embodiments, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure.

[0116] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A nozzle assembly, characterized in that: include: a nozzle, the nozzle comprising a main flow section, a restriction section, and a guide section, the guide section being located downstream of the restriction section, the main flow section being located upstream of the restriction section, the guide section being provided with a first flow channel and a second flow channel in communication, the second flow channel being located downstream of the first flow channel; and A flow guide is provided in the flow channel of the flow guide section, and the limiting section and the second flow channel jointly limit the flow guide in the first flow channel.

2. The nozzle assembly according to claim 1, wherein The limiting section is deformed by at least one of stretching, bending, flattening, and necking after heat treatment, so that the limiting section can limit the guide member within the first flow channel.

3. The nozzle assembly according to claim 1, wherein The limiting section is provided with a third flow channel, and the diameter of the flow surface of the third flow channel close to the outlet of the first flow channel is smaller than the diameter of the circumscribed circle of the flow guide member.

4. The nozzle assembly according to claim 1, wherein The diameter of the flow surface of the second flow channel close to the inlet of the first flow channel is smaller than the diameter of the circumscribed circle of the flow guide.

5. The nozzle assembly according to claim 1, wherein: The diameter of at least part of the flow surface of the first flow channel is larger than the diameter of the circumscribed circle of the flow guide. In the direction of liquid flow in the nozzle, the length of the first flow channel is larger than the length of the flow guide.

6. The nozzle assembly according to claim 1, wherein: The guide section is bent relative to the main flow section, and the main flow section is provided with a main flow channel. The diameter of the flow surface of the main flow channel is larger than the diameter of the circumscribed circle of the guide member, and the angle between the extension direction of the first flow channel and the extension direction of the main flow channel is in the range of [100°, 145°].

7. The nozzle assembly according to claim 1, wherein: In the direction of liquid flow in the nozzle, the area of at least a portion of the flow surface of the first flow channel is configured to gradually decrease.

8. The nozzle assembly according to claim 1, wherein: The guide section is also provided with a fourth flow channel. In the direction of liquid flow in the nozzle, the first flow channel, the fourth flow channel and the second flow channel are connected and communicated in sequence. The guide member is configured to make the area of the flow surface of the fluid in the fourth flow channel larger than the area of the flow surface before entering the fourth flow channel. In the direction of liquid flow in the nozzle, the area of the flow surface of the fourth flow channel is configured to gradually decrease, and the area of the flow surface of the second flow channel is smaller than the area of the flow surface of the first flow channel.

9. The nozzle assembly according to claim 8, wherein: The contraction angle of the fourth flow channel ranges from 30° to 180°.

10. The nozzle assembly according to claim 1, wherein In the direction of liquid flow in the nozzle, the area of the flow surface of the second flow channel is configured to gradually increase.

11. The nozzle assembly according to claim 10, wherein: The expansion angle of the second flow channel ranges from [0° to 15°].

12. The nozzle assembly according to claim 1, wherein The guide member includes an impeller, which includes at least one blade group and a guide column. The guide column extends along the direction of liquid flow in the nozzle. The blade group is arranged on the outer peripheral wall of the guide column, and the blade group is used to form a spiral liquid flow.

13. The nozzle assembly according to claim 12, wherein: The blade assembly includes a plurality of blades, each blade including an end portion away from the outer peripheral wall of the guide column, and a buffer member is provided on the end portion.

14. The nozzle assembly according to claim 12, wherein: The guide column includes a column body and a guide portion. The column body is closer to the second flow channel than the guide portion. In the direction of liquid flow in the nozzle, the cross-sectional area of the guide portion gradually increases.

15. The nozzle assembly according to claim 14, wherein The diameter of the column is less than or equal to 0.5D, where D is the diameter of the inner wall of the first flow channel.

16. The nozzle assembly according to claim 12, wherein: The blade group includes multiple blades; the impeller includes multiple blade groups, and the multiple blade groups are arranged at intervals in the extension direction of the guide column; or, the impeller includes one blade group, and the blades in the blade group extend from one end of the column of the guide column to the other end of the column.

17. The nozzle assembly according to claim 12, wherein: The blade group includes a plurality of blades, and the plurality of blades are evenly distributed on the outer peripheral wall of the guide column.

18. The nozzle assembly according to claim 12, wherein: The blade group includes multiple blades, and the extension direction of the blades is consistent with the extension direction of the guide column; or, the extension direction of the blades is obliquely connected to the extension direction of the guide column; or, the blades extend spirally compared to the extension direction of the guide column.

19. The nozzle assembly according to claim 12, wherein: The length L of the impeller ranges from [5d, 10d], where d is the diameter of the middle position of the guide column.

20. The nozzle assembly of claim 12, wherein: The blade group includes a plurality of blades, and the thickness of the blades is less than or equal to 0.3d, wherein d is the diameter of the middle position of the guide column.

21. The nozzle assembly according to claim 12, wherein: In the case where there are multiple blade groups, the width of the blades in the extension direction of the guide column has a value range of [0.5d, 2.0d], where d is the diameter of the middle position of the guide column.

22. The nozzle assembly of claim 1, wherein: The minimum diameter of the second flow channel is less than or equal to 1.0 mm.

23. The nozzle assembly of claim 1, wherein: The flow guide is configured to cause the area of the flow surface of the fluid in the first flow channel to decrease, increase, decrease, and increase in sequence in the direction of liquid flow in the nozzle.

24. A water flosser, characterized in that: include: body; and The nozzle assembly according to any one of claims 1 to 23, wherein the nozzle assembly is connected to the fuselage.

25. A method for manufacturing a nozzle assembly, characterized in that: The nozzle assembly includes a nozzle and a flow guide, the nozzle includes a first section, a second section, and a third section, the second section connects the first section and the third section, the first section is provided with a main flow channel, the third section is provided with a first flow channel and a second flow channel, and the second flow channel is located downstream of the first flow channel; the manufacturing method includes: placing a flow guide from the main flow channel to the first flow channel; and The shape of the second section is changed by heat treatment, so that the second section can confine the flow guide within the first flow channel.

26. The manufacturing method according to claim 25, characterized in that The manufacturing method further comprises: Pressurized gas is blown into the main flow channel from an inlet end thereof away from the first flow channel, so that the flow guide is maintained at an outlet end of the first flow channel away from the main flow channel.

27. The manufacturing method according to claim 25, characterized in that The step of changing the shape of the second section by heat treatment so that the second section can confine the flow guide within the first flow channel includes: After the second section is heat treated, the second section is bent by at least one of stretching, bending, pinching, and necking, so that the second section can confine the flow guide within the first flow channel.

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