Nozzle assembly and oral irrigator

Abstract

The utility model discloses a nozzle assembly and a water pick. The nozzle assembly comprises a nozzle and a flow guide part. The nozzle comprises a main flow section and a bent section, the main flow section comprises a main flow part and a reinforcing part, the reinforcing part is connected with the peripheral wall of the main flow part, the main flow part is provided with a first flow channel, the bent section is provided with a second flow channel and a third flow channel, and the second flow channel is located between the first flow channel and the third flow channel. The flow guide part is arranged in the bent section, the diameter of the flow passing face of the first flow channel is larger than that of the circumcircle of the flow guide part, and the bent section is bent relative to the main flow section so that the flow guide part can be installed in the second flow channel. And when the water flows into the second flow channel, the flow guide part can play a role in guiding the water, so that the water sprayed from the third flow channel has a relatively good tooth cleaning effect. In addition, the flow guide part is installed in the second flow channel, additional elements for fixing the flow guide part are not needed, and the structure of the nozzle assembly is simple.

Description

Technical Field

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

[0002] As an important oral cleaning tool, water flossers are widely recognized. Water flossers can effectively clean the gingival sulcus and teeth, remove impurities that are difficult to remove with traditional toothbrushes, and effectively clean various gaps, holes and uneven surfaces on the tooth surface. The water jetted by water flossers also has a massage effect on the gums, which can promote blood circulation in the gums and enhance the disease resistance of local tissues. However, the impact force of the liquid ejected from the nozzle of current water flossers is poor, and the flow form of the liquid is relatively simple, resulting in poor cleaning effect on teeth. Utility Model Content

[0003] The embodiments of the present application provide a nozzle assembly and an oral irrigator, 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 mainstream section and a bending section, the mainstream section includes a mainstream part and a reinforcement part, the reinforcement part is connected to the outer peripheral wall of the mainstream part, the mainstream part is provided with a first flow channel, the bending section is provided with a second flow channel and a third flow channel, and the second flow channel is located between the first flow channel and the third flow channel. The guide member is arranged in the bending section, the diameter of the flow surface of the first flow channel is larger than the diameter of the circumscribed circle of the guide member, and the bending section is bent relative to the mainstream section so that the guide member is installed in the second flow channel.

[0005] In some embodiments, the nozzle also includes a connecting section, which connects the bending section and the main flow section, and the connecting section is provided with a fourth flow channel, and the diameter of the flow surface of the fourth flow channel near the outlet of the second flow channel is smaller than the diameter of the circumscribed circle of the guide member.

[0006] In some embodiments, a diameter of a flow surface of the third flow channel near an inlet of the second flow channel is smaller than a diameter of a circumscribed circle of the flow guide.

[0007] In some embodiments, the diameter of at least part of the flow surface of the second flow channel is larger than the diameter of the circumscribed circle of the flow guide, and in the direction of liquid flow in the nozzle, the length of the second flow channel is larger than the length of the flow guide.

[0008] In some embodiments, the angle between the extension direction of the second flow channel and the extension direction of the first flow channel is in the range of [100°, 145°].

[0009] 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 second flow channel is configured to gradually decrease.

[0010] In some embodiments, the bending section is also provided with a fifth flow channel. In the direction of liquid flow in the nozzle, the second flow channel, the fifth flow channel and the third flow channel are connected and communicated in sequence, and the flow guide is configured to make the area of ​​the flow surface of the fluid in the fifth flow channel larger than the area of ​​the flow surface before entering the fifth flow channel. In the direction of liquid flow in the nozzle, the area of ​​the flow surface of the fifth flow channel is configured to gradually decrease, and the area of ​​the flow surface of the third flow channel is smaller than the area of ​​the flow surface of the second flow channel.

[0011] In some embodiments, the contraction angle of the fifth flow channel ranges from [30° to 180°].

[0012] In certain embodiments, in the direction of liquid flow in the nozzle, the area of ​​the flow surface of the third flow channel is configured to gradually increase.

[0013] In some embodiments, the expansion angle of the third flow channel ranges from [0° to 15°].

[0014] 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, 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.

[0015] In some embodiments, the blade assembly includes a plurality of blades, and the blade includes an end portion away from the outer peripheral wall of the guide column, and a buffer is provided on the end portion.

[0016] In some embodiments, the guide column includes a column body and a guide portion, the column body is closer to the third 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.

[0017] 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 second flow channel.

[0018] In some embodiments, the blade group includes a plurality of blades; the impeller includes a plurality of the blade groups, and the plurality of the 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 body of the guide column to the other end of the column body.

[0019] In some embodiments, 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.

[0020] 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.

[0021] 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.

[0022] In some embodiments, the blade assembly includes a plurality of blades, and the blades extend in a spiral direction relative to an extension direction of the guide column.

[0023] 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.

[0024] In some embodiments, the blade group includes a plurality of blades, and a thickness of the blades is less than or equal to 0.3d, wherein d is a diameter of a middle position of the guide column.

[0025] In certain embodiments, when there are multiple blade groups, in the extension direction of the guide column, the width of the blades ranges from [0.5d, 2.0d], where d is the diameter of the middle position of the guide column.

[0026] In certain embodiments, a minimum diameter of the third flow channel is less than or equal to 1.0 mm.

[0027] In certain embodiments, the flow guide is configured to cause the area of ​​the flow surface of the fluid in the second flow channel to decrease, increase, decrease, and increase in sequence in the direction of liquid flow in the nozzle.

[0028] 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.

[0029] 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 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 the guide member from the main flow channel to the first flow 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 flow channel.

[0030] In some embodiments, pressurized gas is blown into the main flow channel from an inlet end thereof away from the first flow channel, so that the guide member is maintained at an outlet end of the first flow channel away from the main flow channel.

[0031] In some embodiments, changing 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 heat treating the second section, bending the second section by at least one of stretching, bending, flattening, and necking so that the second section can confine the guide member within the first flow channel.

[0032] In the nozzle assembly and water flosser of the embodiment of the present application, the guide member is installed in the second flow channel. When the user uses the nozzle assembly, the water flows through the first flow channel, the second flow channel and the third flow channel in sequence and is sprayed into the user's oral cavity. When the water flows into the second flow channel, the guide member can play a certain guiding role on the water flow, so that the water flow sprayed from the third flow channel has a better cleaning effect on the teeth. In addition, when the guide member is installed in the second flow channel, since the bending section is bent compared to the main flow section, the guide member can be stably installed in the second flow channel, and no additional components are required to fix the guide member, and the structure of the nozzle assembly is relatively simple.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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:

[0035] Figure 1 is a three-dimensional schematic diagram of a water flosser according to some embodiments of the present application;

[0036] Figure 2 is a perspective schematic diagram of a nozzle assembly according to certain embodiments of the present application;

[0037] Figure 3 yes Figure 2 A cross-sectional schematic diagram of a nozzle assembly;

[0038] Figure 4 yes Figure 3 An enlarged schematic diagram of the nozzle assembly at position IV-IV;

[0039] Figure 5 yes Figure 3 An enlarged schematic diagram of the nozzle assembly at position IV-IV;

[0040] Figure 6is a perspective schematic diagram of a flow guide of a nozzle assembly in some embodiments;

[0041] Figure 7 is a perspective schematic diagram of a flow guide of a nozzle assembly in other embodiments;

[0042] Figure 8 is a perspective schematic diagram of a flow guide of a nozzle assembly in still other embodiments;

[0043] Fig. 9 is a flow chart of a method for manufacturing a nozzle assembly according to certain embodiments of the present application;

[0044] Fig.10 is a flow chart of a method for manufacturing a nozzle assembly according to certain embodiments of the present application.

[0045] Description of main component symbols:

[0046] 1000, oral irrigator; 100, nozzle assembly; 300, body; 10, nozzle; 11, main flow section; 111, first flow channel; 113, main flow section; 115, reinforcement section; 13, bending section; 131, second flow channel; 133, third flow channel; 135, fifth flow channel; 15, connecting section; 151, fourth flow channel; 30, guide member; 31, impeller; 311, blade group; 3111, blade; 3113, buffer member; 313, guide column; 3131, column; 3133, guide section. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "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 orientation or position relationship.

[0049] The orientations or positional relationships shown in the drawings are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature 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. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0054] As an important oral cleaning tool, water flossers are widely recognized. Using a water flosser can effectively clean the gingival sulcus and teeth, remove impurities that are difficult to remove with a traditional toothbrush, and effectively clean various gaps, holes, and uneven surfaces on the tooth surface. The water jetted by the water flosser also has a massage effect on the gums, which can promote blood circulation in 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 water flosser 1000 ( Figure 1 shown).

[0055] 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.

[0056] 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 and mode in real time, so that users can understand the status of the oral irrigator 1000.

[0057] When the user uses the water flosser 1000, the nozzle assembly 100 directly contacts the oral cavity, and the nozzle assembly 100 is used to spray the high-pressure water flow provided by the body 300 into the oral cavity. The water line sprayed by the nozzle assembly 100 is thin, and can penetrate into the hard-to-clean places such as the gaps between teeth and the gingival sulcus, remove food residues and dental plaque, and effectively prevent and improve oral problems. In addition, the water flow sprayed onto the gums can also play a massage role, promote blood circulation in the gums, and relieve problems such as bleeding and swelling of the gums.

[0058] Preferably, the nozzle assembly 100 is detachably connected to the body 300 to facilitate the 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.

[0059] See also Figures 2 to 4The nozzle assembly 100 of the embodiment of the present application includes a nozzle 10 and a guide member 30. The nozzle 10 includes a main flow section 11 and a bending section 13. The main flow section 11 includes a main flow portion 113 and a reinforcement portion 115. The reinforcement portion 115 is connected to the outer peripheral wall of the main flow portion 113. The main flow portion 113 is provided with a first flow channel 111. The bending section 13 is provided with a second flow channel 131 and a third flow channel 133. The second flow channel 131 is located between the first flow channel 111 and the third flow channel 133. The guide member 30 is arranged in the bending section 13. The diameter of the flow surface of the first flow channel 111 is larger than the diameter of the circumscribed circle of the guide member 30. The diameter of the flow surface of the third flow channel 133 near the entrance of the second flow channel 131 is smaller than the diameter of the circumscribed circle of the guide member 30. The bending section 13 is bent relative to the main flow section 11 so that the guide member 30 is installed in the second flow channel 131.

[0060] 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 of the embodiment of the present application is plastic, and the plastic nozzle 10 can soften after heating, so that the nozzle 10 can be bent to form a mainstream section 11 and a bending section 13.

[0061] The main flow section 11 is used to allow the clean water in the body 300 to flow through. When the user uses the water flosser 1000, the water in the liquid storage space of the body 300 flows through the main flow section 11 and the bending section 13 and is sprayed into the user's mouth to clean the gaps between teeth and the gingival sulcus. The main flow section 113 can be a linear column structure. It can be understood that the linear column here refers to a column whose central axis is a straight line. The first flow channel 111 in the main flow section 113 is also a linear flow channel, and the flow area at each position of the first flow channel 111 can be equal, so that when the water flows in the first flow channel 111, it is not easy to generate turbulence, and the energy loss of the water flow is small. In addition, compared with the curved flow channel, the linear first flow channel 111 is easier to process and produce, which can improve the yield of the nozzle 10 in the production process and reduce the production cost of the nozzle 10. Since the outer contour diameter of the mainstream section 113 is small and the length of the mainstream section 113 is long, the strength of the mainstream section 113 is low and it is easy to deform. The reinforcing portion 115 of the present application is arranged around the outer peripheral wall of the mainstream section 113. The reinforcing portion 115 is used to improve the overall strength of the mainstream section 11 on the one hand to avoid the problem of deformation of the mainstream section 11, and on the other hand, the reinforcing portion 115 can also improve the overall aesthetics of the nozzle 10. In addition, when the nozzle assembly 100 is installed on the fuselage 300, the reinforcing portion 115 is located at one end of the mainstream section 113 close to the fuselage 300 and abuts against the fuselage 300. In the case that the oral irrigator 1000 falls, the nozzle 10 is more likely to break at a position close to the fuselage 300. In the case that the reinforcing portion 115 surrounds the outer peripheral wall of the mainstream section 113 and abuts against the fuselage 300, the reinforcing portion 115 can improve the strength of the position of the nozzle 10 close to the fuselage 300, thereby avoiding the nozzle 10 from breaking when the oral irrigator 1000 falls. The reinforcement portion 115 and the mainstream portion 113 may be an integral structure or a separate structure. Preferably, the reinforcement portion 115 and the mainstream portion 113 are an integral structure and may be integrally formed, so that the connection between the reinforcement portion 115 and the mainstream portion 113 is more stable and the processing steps of the nozzle 10 are also simpler.

[0062] See also Figures 2 to 4When the user uses the water flosser 1000, the bend section 13 goes deeper into the user's oral cavity than the main section 11, and water flows out from the bend section 13 and sprays to clean the gaps between teeth and the gingival sulcus. The bend section 13 is bent relative to the main section 11. On the one hand, the bend section 13 can better penetrate into the oral cavity, corresponding to the gaps between teeth and the gingival sulcus and other places that need to be cleaned, and in the process of using the nozzle assembly 100, the user does not need to significantly adjust the posture of the arm to facilitate comprehensive cleaning of the oral cavity; on the other hand, the guide member 30 can be stably installed in the second flow channel 131, and the bend between the main section 11 and the bend section 13 can play a certain limiting role on the guide member 30, which can prevent the guide member 30 in the second flow channel 131 from shifting to the first flow channel 111 or falling out of the first flow channel 111.

[0063] When the user uses the water flosser 1000, the outlet position of the bent section 13 is aligned with the place that needs to be cleaned (for example, the gap between teeth or the gingival sulcus, etc.), and the water flow in the water storage space of the body 300 flows through the first flow channel 111, the second flow channel 131 and the third 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. The diameters of the flow surfaces at various positions of the second flow channel 131 can be the same or different. The diameters of the flow surfaces at various positions of the third flow channel 133 can be the same or different. Preferably, the diameter of the flow surface of the third flow channel 133 is smaller, so that the water flow ejected from the third flow channel 133 can be concentrated in a specific area, thereby more effectively and deeply cleaning the gap between teeth or the gingival sulcus, etc.

[0064] See also Figure 3 and Figure 4 , the guide member 30 is located in the second 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 second flow channel 131. In another embodiment, the guide member 30 is located in the second flow channel 131 and can move in the second flow channel 131. The guide member 30 can play a certain guiding role on the water flow entering the second flow channel 131. Exemplarily, the guide member 30 can change the spray direction of the water flow. For example, when the water flows 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 sprayed from the third flow channel 133 has a better cleaning effect on the positions such as the tooth gap or the gingival sulcus.

[0065] Preferably, in the process of water flowing through the second 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 the positions such as the tooth gap 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 it, and the distance between the nozzle 10 and the surface of the impacted object (positions such as teeth, tooth gaps and 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. Since the microjet impact and shock wave impact are 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 teeth, tooth gaps and gingival sulcus, so that the dental plaque on the tooth surface, tooth gaps and gingival sulcus can be quickly destroyed, 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 jets much better than that of non-cavitation jets at the same pump pressure and flow rate.

[0066] In the case where the diameter of the flow surface of the first flow channel 111 is larger than the diameter of the circumscribed circle of the flow guide 30, that is, the flow area at each position of the first flow channel 111 is larger than the area of ​​the circumscribed circle of the flow guide 30. The flow area at each position of the first flow channel 111 is larger than the area of ​​the circumscribed circle of some positions of the flow guide 30, and the flow area at each position of the first flow channel 111 may also be larger than the area of ​​the circumscribed circle of all positions of the flow guide 30. Preferably, the flow area at each position of the first flow channel 111 is larger than the area of ​​the circumscribed circle of all positions of the flow guide 30, so that when the bending section 13 is not bent compared to the main flow section 11, the flow guide 30 can smoothly pass through the first flow channel 111 and enter the second flow channel 131. After the guide member 30 enters the second flow channel 131, the bending section 13 can be bent compared to the mainstream section 11, and the bending point between the bending section 13 and the mainstream section 11 can limit the guide member 30, thereby preventing the guide member 30 located in the second flow channel 131 from moving into the first flow channel 111, and the guide member 30 can be stably located in the second flow channel 131.

[0067] In the case where the diameter of the flow surface of the third flow channel 133 near the entrance of the second flow channel 131 is smaller than the diameter of the circumscribed circle of the flow guide 30, that is, the flow area of ​​the third flow channel 133 near the entrance of the second flow channel 131 is smaller than the area of ​​the circumscribed circle of the flow guide 30. The flow area of ​​the third flow channel 133 near the entrance of the second flow channel 131 may be smaller than the area of ​​the circumscribed circle of a part of the flow guide 30. At this time, the inner wall of the third flow channel 133 may play a certain limiting role on the flow guide 30, and can prevent the flow guide 30 from moving into the third flow channel 133 or falling out of the nozzle 10 through the third flow channel 133. The flow area of ​​the third flow channel 133 near the entrance of the second 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 third flow channel 133 near the entrance of the second flow channel 131 can limit the movement of the guide member 30 from the second flow channel 131 to the third flow channel 133, and the guide member 30 can be stably located in the second flow channel 131.

[0068] In the nozzle assembly 100 of the embodiment of the present application, the guide member 30 is installed in the second flow channel 131. When the user uses the nozzle assembly 100, the water flows through the first flow channel 111, the second flow channel 131 and the third flow channel 133 in sequence and is sprayed into the user's oral cavity. When the water flows into the second flow channel 131, the guide member 30 can play a certain guiding role on the water flow, so that the water flow sprayed from the third flow channel 133 has a better cleaning effect on the teeth. In addition, when the guide member 30 is installed in the second flow channel 131, since the bending section 13 is bent compared to the main flow section 11, the guide member 30 can be stably installed in the second flow channel 131, and no additional components are required to fix the guide member 30. The structure of the nozzle assembly 100 is relatively simple.

[0069] The nozzle assembly 100 is further described below with reference to the accompanying drawings.

[0070] See also Figures 2 to 4 Furthermore, in some embodiments, the nozzle 10 also includes a connecting section 15, which connects the bending section 13 and the main flow section 11, and the connecting section 15 is provided with a fourth flow channel 151, and the diameter of the flow surface of the fourth flow channel 151 near the outlet of the second flow channel 131 is smaller than the diameter of the circumscribed circle of the guide member 30.

[0071] Among them, one end of the connecting section 15 is connected to the bending section 13, and the other end of the connecting section 15 is connected to the mainstream section 11. The mainstream section 11, the connecting section 15 and the bending section 13 can be an integral structure or a split structure. In the case where the mainstream section 11, the connecting section 15 and the bending section 13 are an integral structure, the mainstream section 11, the connecting section 15 and the bending section 13 can be integrally formed, thereby reducing the assembly steps of the nozzle assembly 100. In the case where the mainstream section 11, the connecting section 15 and the bending section 13 are split structures, the mainstream section 11, the connecting section 15 and the bending section 13 are detachably or non-detachably connected. Among them, the detachable connection method includes a snap connection, a threaded connection or a bolt connection, etc., and the non-detachable connection direction includes a gluing connection, a hot melt connection or an interference connection, etc. In the case where the mainstream section 11, the connecting section 15 and the bending section 13 are detachably connected, it is convenient to repair and replace the mainstream section 11, the connecting section 15 or the bending section 13. The main flow section 11, the connecting section 15 and the bending section 13 of the present application are an integrated structure.

[0072] See also Figure 3 and Figure 4 , the fourth flow channel 151 connects the first flow channel 111 and the second flow channel 131. When the water flosser 1000 is started, the water in the water storage space of the body 300 flows through the first flow channel 111, the fourth flow channel 151, the second flow channel 131 and the third 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. When the bending section 13 is not bent compared to the main flow section 11, the diameter of the flow surface of the fourth flow channel 151 can be equal to the diameter of the flow surface of the first flow channel 111, so that the guide member 30 can smoothly pass through the first flow channel 111 and the fourth flow channel 151 into the second flow channel 131. After the guide member 30 enters the second flow channel 131, the connecting section 15 can be bent and deformed so that the bending section 13 is bent compared to the main flow section 11. When the connecting section 15 is bent and deformed, the peripheral wall of the fourth flow channel 151 is deformed, so that the diameter of the flow surface of the fourth flow channel 151 is reduced, and thus the inner wall of the fourth flow channel 151 can play a certain limiting role on the flow guide 30 in the second flow channel 131, thereby preventing the flow guide 30 in the second flow channel 131 from moving into the fourth flow channel 151. When the flow guide 30 is stably in the second flow channel 131, the flow guide 30 has a better flow guiding effect on the water flow entering the second flow channel 131.

[0073] In the case where the diameter of the flow surface of the fourth flow channel 151 near the outlet of the second flow channel 131 is smaller than the diameter of the circumscribed circle of the flow guide 30, the diameter of the fourth flow channel 151 near the outlet of the second flow channel 131 may be smaller than the diameter of the circumscribed circle of some positions of the flow guide 30, and the diameter of the flow surface of the fourth flow channel 151 near the outlet of the second flow channel 131 may also be smaller than the diameter of the circumscribed circle of all positions of the flow guide 30. Preferably, the diameter of the fourth flow channel 151 near the outlet of the second flow channel 131 is smaller than the diameter of the circumscribed circle of all positions of the flow guide 30, and the inner wall of the fourth flow channel 151 near the outlet of the second flow channel 131 can limit the movement of the flow guide 30 from the second flow channel 131 to the fourth flow channel 151, and the flow guide 30 can be stably located in the second flow channel 131.

[0074] See also Figure 3 and Figure 4 In some embodiments, the diameter of at least part of the flow surface of the second 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 second flow channel 131 is greater than the length of the guide member 30 .

[0075] When the diameter of at least part of the flow surface of the second 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 first flow channel 111 and the fourth flow channel 151, the guide member 30 can smoothly enter the second flow channel 131 and be located in the second flow channel 131.

[0076] In the direction of liquid flow in the nozzle 10, when the length of the second flow channel 131 is greater than the length of the guide member 30, after the guide member 30 is installed in the second flow channel 131, there is still a certain reserved size in the second flow channel 131. When the connecting section 15 is bent and deformed so that the bending section 13 is bent compared to the main flow section 11, under the influence of the connecting section 15, a part of the main flow section 11 and a part of the bending section 13 close to the connecting section 15 may be slightly deformed. In the case of a certain reserved size in the second flow channel 131, when the bending section 13 is slightly deformed near the connecting section 15, the deformation of the bending section 13 can be avoided from affecting the guide member 30 in the second flow channel 131. In addition, in the direction of liquid flow in the nozzle 10, when the guide member 30 is short, the obstruction of the water flow by the guide member 30 can be reduced, and the turbulence and energy loss of the water flow can be reduced, thereby improving the injection efficiency and performance of the nozzle 10.

[0077] See also Figure 4 and Figure 5In some embodiments, the angle a between the extension direction of the second flow channel 131 and the extension direction of the first flow channel 111 is in the range of [100°, 145°]. For example, the angle a between the extension direction of the second flow channel 131 and the extension direction of the first flow channel 111 may be 100°, 106°, 113°, 117°, 121°, 128°, 132°, 139°, 141°, or 145°.

[0078] When the angle a between the extension direction of the second flow channel 131 and the extension direction of the first flow channel 111 is less than 100°, the turning angle of the water flow is large during the process of the fluid in the first flow channel 111 flowing to the second flow channel 131 through the fourth flow channel 151, so that the energy loss of the water flow is large, and the water flow ejected from the third flow channel 133 has a poor cleaning effect on the tooth gap and gingival sulcus. When the angle a between the extension direction of the second flow channel 131 and the extension direction of the first flow channel 111 is greater than 145°, the bending amplitude of the bending section 13 is smaller than that of the main flow section 11, that is, the degree of bending deformation of the connecting section 15 is smaller, and the inner wall of the fourth flow channel 151 has a poor limiting effect on the guide member 30 in the second flow channel 131, and the guide member 30 in the second flow channel 131 may move into the fourth flow channel 151 and fall off from the nozzle 10 through the first flow channel 111. When the angle a between the extension direction of the second flow channel 131 and the extension direction of the first flow channel 111 is in the range of [100°, 145°], the bending amplitude of the bending section 13 is larger than that of the main flow section 11, that is, the degree of bending deformation of the connecting section 15 is larger, and the inner wall of the fourth flow channel 151 has a better limiting effect on the flow guide 30 in the second flow channel 131, which can avoid the problem of the flow guide 30 in the second flow channel 131 moving into the fourth flow channel 151. At this time, when the fluid in the first flow channel 111 flows to the second flow channel 131 through the fourth flow channel 151, the turning angle of the water flow is relatively small, so that the energy loss of the water flow is small, and the water flow ejected from the third flow channel 133 has a better cleaning effect on the positions such as the tooth gap and the gingival sulcus. In addition, compared with the bend of the main section 11, the bend section 13 can also take into account the size of the teeth, gums and lips, which is beneficial for the turning and displacement of the nozzle 10 in the oral cavity, and can further improve the user experience.

[0079] See also Figure 3 and Figure 4In some embodiments, in the direction of liquid flow in the nozzle 10, the area of ​​at least part of the flow surface of the second flow channel 131 is configured to gradually decrease. In the present application, in the direction of liquid flow in the nozzle 10, the area of ​​the flow surface of all positions of the second flow channel 131 is configured to gradually decrease, that is, along the direction of liquid flow in the nozzle 10, the flow area of ​​the end of the second flow channel 131 close to the fourth flow channel 151 is larger than the flow area of ​​the end of the second flow channel 131 close to the third flow channel 133. The flow area of ​​the end of the second flow channel 131 close to the fourth flow channel 151 is larger than the area of ​​the circumscribed circle of the flow guide 30, so that the flow guide 30 can smoothly enter the second flow channel 131. The flow area of ​​the end of the second flow channel 131 close to the third flow channel 133 is less than or equal to the area of ​​the circumscribed circle of the flow guide 30, so that at least part of the inner wall of the second flow channel 131 can form a tight fit with the flow guide 30, and the flow guide 30 can be firmly installed in the second 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 direction of the flow guide 30. After the flow guide 30 enters the second flow channel 131, the second flow channel 131 can match the outer contour of the flow guide 30, so that the connection between the flow guide 30 and the inner wall of the second flow channel 131 is more stable. In addition, in the direction of liquid flow in the nozzle 10, when the second flow channel 131 is a tapered channel, when the water flows through the second flow channel 131, the flow area of ​​the second flow channel 131 gradually decreases, and the water can flow at a high speed in the second flow channel 131, thereby increasing the flow rate of the water.

[0080] See also Figure 3 and Figure 4 Furthermore, in some embodiments, the bending section 13 is also provided with a fifth flow channel 135. In the direction of liquid flow in the nozzle 10, the second flow channel 131, the fifth flow channel 135 and the third flow channel 133 are connected and communicated in sequence, and the flow guide 30 is configured to make the area of ​​the flow surface of the fluid in the fifth 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 fifth flow channel 135 is configured to gradually decrease, and the area of ​​the flow surface of the third flow channel 133 is smaller than the area of ​​the flow surface of the second flow channel 131.

[0081] Specifically, the fifth flow channel 135 is a tapered flow channel. When the oral irrigator 1000 is started, the clean water in the water storage space of the body 300 flows through the first flow channel 111, the fourth flow channel 151, the second flow channel 131, the fifth flow channel 135 and the third 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.

[0082] Since the guide member 30 is located in the second flow channel 131, the flow area of ​​the water flow is relatively small when the water flows through the second flow channel 131. When the water flows from the second channel into the fifth channel, the flow area of ​​the water flow increases rapidly, and since the area of ​​the flow surface of the fifth 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 fifth flow channel 135. Specifically, when a stable water flow flows through the outlet contraction section of the resonant cavity (fifth flow channel 135) of the nozzle 10, self-excited pressure excitation is generated, and this pressure excitation is fed back to the resonant cavity (fifth flow channel 135) to form feedback pressure oscillation. By designing the size of the resonance cavity (fifth 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 (fifth flow channel 135), so as to form acoustic harmonic resonance in the resonance cavity, and the fluid ejected from the third 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 enhancing the cleaning effect of the water flow ejected by the nozzle 10 on the tooth gaps and gingival sulcus and other locations.

[0083] See also Figure 4 and Figure 5 In some embodiments, the value range of the contraction angle b of the fifth flow channel 135 is [30°, 180°]. Exemplarily, the value of the contraction angle b of the fifth flow channel 135 may be 30°, 46°, 51°, 64°, 75°, 82°, 91°, 122°, 154°, or 180°. When the contraction angle b of the fifth flow channel 135 is less than 30°, the area of ​​the flow surface of the third flow channel 133 connected to the fifth flow channel 135 will be larger, so that the pressure of the water flow ejected from the third flow channel 133 will be smaller, the speed will be lower, and the position such as the tooth gap or the gingival sulcus cannot be cleaned accurately, and the water flow ejected from the nozzle 10 has a poor cleaning effect on the oral cavity. When the contraction angle b of the fifth flow channel 135 is [30°, 180°], the flow surface area of ​​the third flow channel 133 connected to the fifth flow channel 135 is relatively small, and the flow velocity and pressure of the water flow can be increased when the water flows through the third flow channel 133, so that the pressure and speed of the water flow ejected from the third flow channel 133 are relatively large, and the speed is relatively high, and the positions such as the gaps between teeth or the gingival sulcus can be cleaned accurately, and the nozzle 10 has a better cleaning effect on the oral cavity.

[0084] See also Figure 3 and Figure 4In some embodiments, the flow guide 30 is configured to make the area of ​​the flow surface of the fluid in the second flow channel 131 decrease, increase, decrease, and increase in the direction of the liquid flow in the nozzle 10. At this time, when the water flows through the second flow channel 131, the flow area of ​​the water flow decreases first and then increases. The water flow can form the first Helmholtz oscillation cavity at the position where the flow area increases, thereby improving the cavitation effect of the water flow. Then, the water flow goes through the process of decreasing and increasing the flow area again, and the water flow forms the 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 improved, so that the water flow sprayed from the nozzle 10 has a better cleaning effect on the tooth gaps and gingival sulci.

[0085] See also Figure 3 and Figure 4 In some embodiments, in the direction of liquid flow in the nozzle 10, the area of ​​the flow surface of the third flow channel 133 is configured to gradually increase. On the one hand, the water flow is ejected from the third flow channel 133 into the oral cavity through the fifth flow channel 135, which can increase the cavitation effect of the water flow, so that the water flow ejected from the third flow channel 133 has a better cleaning effect on the teeth, the gaps between teeth, the gingival sulcus and other locations. On the other hand, the area of ​​the flow surface of the third flow channel 133 is configured to gradually increase, and the area of ​​the water flow ejected from the third flow channel 133 is larger, so that the contact area between the water flow and the gaps between teeth and the gingival sulcus and other locations is larger, and the nozzle 10 has a higher cleaning efficiency for the oral cavity.

[0086] See also Figure 4 and Figure 5 In some embodiments, the expansion angle c of the third flow channel 133 has a value range of [0°, 15°]. Exemplarily, the expansion angle c of the third flow channel 133 may be 0°, 2°, 5°, 7°, 9°, 11°, 12°, 13°, 14°, or 15°. When the expansion angle c of the third flow channel 133 is greater than 15°, the area of ​​the flow surface of the third flow channel 133 is too large, the pressure of the water flow ejected from the third flow channel 133 is relatively small, the speed is relatively low, and the positions such as the gaps between teeth or the gingival sulcus cannot be cleaned accurately, and the cleaning effect of the nozzle 10 on the oral cavity is relatively poor. When the expansion angle c of the third flow channel 133 takes a value range of [0°, 15°], the area of ​​the flow surface of the third flow channel 133 is small, and the flow rate and pressure of the water flow can be increased when the water flows through the third flow channel 133, so that the pressure and speed of the water flow ejected from the third flow channel 133 are larger, and the position such as the gap between teeth or gingival sulcus can be cleaned accurately, and the nozzle 10 has a better cleaning effect on the oral cavity.

[0087] See also Figure 3 and Figure 4In some embodiments, the minimum diameter of the third flow channel 133 is less than or equal to 1.0 mm. Since the third flow channel 133 is a gradually expanding channel, the diameter of the flow surface of the third flow channel 133 at one end close to the fifth flow channel 135 is the smallest, that is, the value range of the diameter of the flow surface of the third flow channel 133 at one end close to the fifth flow channel 135 is (0.0 mm, 1.0 mm]. Exemplarily, the value of the diameter of the flow surface of the third flow channel 133 at one end close to the fifth 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.

[0088] When the diameter of the flow surface of the third flow channel 133 at one end close to the fifth flow channel 135 is greater than 1.0 mm, the area of ​​the flow surface of the third flow channel 133 is too large, the pressure of the water flow ejected from the third flow channel 133 will be relatively small, the speed will be relatively low, and the positions such as the gaps between teeth or the gingival sulcus cannot be cleaned accurately, and the nozzle 10 has a poor cleaning effect on the oral cavity. When the diameter of the flow surface at one end of the third flow channel 133 close to the fifth flow channel 135 is in the range of (0.0mm, 1.0mm], in the process of water flowing through the fifth flow channel 135 into the third 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 third flow channel 133 is smaller, and the fine water flow can penetrate more deeply into the gaps between teeth and the gingival sulcus to remove food residues and dental plaque that are difficult to reach. At the same time, when the diameter of the third 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 teeth and keep the oral cavity clean and hygienic.

[0089] The current production of the nozzle 10 usually tries to reduce the cross section of the outlet to form a more impactful and concentrated columnar jet. The smallest cross section of the nozzle 10 mold is on the innermost side, and the strength requirement is high, and the mold is easily damaged. In the nozzle assembly 100 of the present application, the cross section of the nozzle 10 outlet is controlled by the cooperation of the inner hole of the third flow channel 133 close to the fifth flow channel 135 and the guide member 30, and the guide member 30 can be manufactured separately, which reduces the difficulty of the mold and improves production reliability.

[0090] See also Figures 6 to 8In some embodiments, the flow guide 30 includes an impeller 31, the impeller 31 includes at least one blade group 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 group 311 is arranged on the outer peripheral wall of the flow guide column 313, and the blade group 311 is used to form a spiral liquid flow. In some embodiments, the length L of the impeller 31 ranges from [5d, 10d], where d is the diameter of the middle position of the flow guide column 313.

[0091] The number of blade groups 311 may be, but is not limited to, one group, two groups, three groups, four groups or more groups. The blade groups 311 are used to form a spiral water flow into the second flow channel 131, thereby generating a cavitation effect. The blade groups 311 are also used to make the flow area of ​​the water entering the second flow channel 131 in the second flow channel 131 experience a process of first decreasing and then increasing, so that a Helmholtz oscillation cavity can be formed in the bending section 13 to enhance the cavitation effect of the water flow.

[0092] The setting of the guide column 313 can reduce the flow rate in the center of the second flow channel 131, that is, in the process of water flowing into the second 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.

[0093] See also Figures 6 to 8 Specifically, in some embodiments, the blade assembly 311 includes a plurality of blades 3111, and the plurality of blades 3111 are evenly distributed on the outer peripheral wall of the guide column 313. The blade 3111 includes an end away from the outer peripheral wall of the guide column 313, and a buffer is provided on the end. In some embodiments, the thickness H of the blade 3111 is less than or equal to 0.3d.

[0094] The number of blades 3111 in each blade group 311 includes, but is not limited to, two, three, four or more. It is believed that the increase in the number of blades 3111 can increase the contact area between the water flow in the second flow channel 131 and the blades 3111, and the guiding effect and swirl effect of the blades 3111 on the water flow are more obvious, but at the same time, the energy loss of the water flow will also increase. Taking into account the cavitation ability and jet erosion ability of the nozzle 10, each blade group 311 in the embodiment of the present application includes three blades 3111.

[0095] Please combine Figure 4When the impeller 31 and the inner wall of the second flow channel 131 are tightly matched, the buffer can be deformed to a certain extent, so that the connection between the impeller 31 and the inner wall of the second flow channel 131 is stable, and the impeller 31 is not easily separated from the inner wall of the second flow channel 131. In addition, the setting of the buffer can also buffer the impact between the impeller 31 and the inner wall of the second flow channel 131, avoiding the impeller 31 and the inner wall of the second flow channel 131 from scratching, resulting in a shorter service life of the impeller 31 and the nozzle 10. The buffer can be soft rubber.

[0096] 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 third 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.

[0097] Please combine Figure 4 The guide portion 3133 is a generally conical structure, and the sharp corner of the guide portion 3133 faces the fourth flow channel 151. The guide portion 3133 is used to guide the water flow entering the second flow channel 131 from the fourth flow channel 151. The guide portion 3133 can guide the water flow entering the second flow channel 131 from the fourth flow channel 151 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.

[0098] The column 3131 and the guide part 3133 may be an integral structure or a split structure. In the case where the column 3131 and the guide part 3133 are an integral structure, the column 3131 and the guide part 3133 may be integrally formed, which may reduce the assembly steps of the impeller 31. In the case where the column 3131 and the guide part 3133 are split structures, the column 3131 and the guide part 3133 may be detachably or non-detachably connected. Among them, the detachable connection method includes a snap connection, a threaded connection or a bolt connection, etc., and the non-detachable connection direction includes a gluing connection, a hot melt connection or an interference connection, etc.

[0099] 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 second 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 interval between the cylinder 3131 and the inner wall of the second 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 second flow channel 131 is small. When 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.

[0100] See also Figure 6 and Figure 7 In some embodiments, the impeller 31 includes a plurality of blade groups 311, and the plurality of blade groups 311 are arranged at intervals in the extension direction of the guide column 313. In this case, the cavitation effect of the water flow in the second flow channel 131 can be increased, the nozzle assembly 100 has a better cleaning effect on the oral cavity, and at the same time, the material of the blades 3111 can be saved, the weight of the impeller 31 is light, and thus the weight of the nozzle assembly 100 is light, and it is easy to carry.

[0101] In one example, when the impeller 31 includes two blade groups 311, the two blade groups 311 are arranged at intervals in the extension direction of the guide column 313. When the water flow from the fourth flow channel 151 into the second flow channel 131 passes through a 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, and the water flow can enhance the cavitation effect there. When the water flow passes through the second blade group 311 and flows into the fifth flow channel 135, the water flow will also undergo a process in which the flow area first decreases and then increases, so that another Helmholtz oscillation cavity can be formed in the fifth flow channel 135, and the water flow can also enhance the cavitation effect there, and the water flow ejected from the third flow channel 133 has a better cleaning effect on the tooth gap and gingival sulcus.

[0102] See also Figure 8In other embodiments, the impeller 31 includes a blade set 311, and the blades 3111 in the blade set 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 second flow channel 131 into the fifth flow channel 135, the flow area of ​​the water flow undergoes a process of first decreasing and then increasing, so that a Helmholtz oscillation cavity is formed in the fifth flow channel 135, where the water flow can enhance the cavitation effect, and the water flow ejected from the third flow channel 133 has a better cleaning effect on the tooth gap and gingival sulcus.

[0103] 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 At this time, the angle between the extension direction of the blade 3111 and the extension direction of the guide column 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. 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.

[0104] 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 flow passing through the impeller 31, the blade 3111 can guide the water flow, and the water flow can form rotating cavitation in the second flow channel 131. Combined with the pressurization effect of the fifth 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 third 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.

[0105] 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). At this time, when the water flows through the impeller 31, the blades 3111 can make the water flow spiral, and the water flow can form rotating cavitation in the second flow channel 131. Combined with the pressurization effect of the fifth flow channel 135 (contraction flow channel), a rotating cavitation jet with high central axial velocity, large peripheral tangential velocity, and strong cavitation ability can be formed in the third 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 one blade group 311.

[0106] See also Figure 6 and Figure 7 In some embodiments, when there are multiple blade groups 311 , in the extension direction of the guide column 313 , the width W of the blade 3111 ranges from [0.5d, 2.0d], where d is the diameter of the middle position of the guide column 313 .

[0107] See also Fig. 9 and Fig.10 In the manufacturing method of the nozzle assembly 100 of the embodiment of the present application, the nozzle assembly 100 includes a nozzle 10 and a guide member 30, the nozzle 10 includes a first section (main flow section 11), a second section (restriction section 15) and a third section (guide section 13), the second section connects the first section and the third section, the first section is provided with a main flow channel 111, the third section is provided with a first flow channel 131 and a second flow channel 133, and the second flow channel 133 is located downstream of the first flow channel 131; the manufacturing method includes:

[0108] 01: Place the flow guide 30 from the main flow channel 111 to the first flow channel 131;

[0109] 03: Blow the pressurized gas into the main flow channel 111 from the inlet end away from the first flow channel 131 so that the guide member 30 is kept at the outlet end of the first flow channel 131 away from the main flow channel 111; and

[0110] 05: The shape of the second section is changed by heating treatment so that the second section can confine the guide member 30 within the first flow channel 131 .

[0111] In some embodiments, 03: pressurized gas is blown into the main channel 111 from the inlet end away from the first channel 131 to keep the guide member 30 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.

[0112] Please combine Figure 3 and Figure 4Preferably, the diameter of the flow 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 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 the 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, and the flow guide 30 can be tightly matched with the inner wall of the first channel 131 at this position, 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 .

[0113] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned 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. At the same time, other implementation methods can be derived from the above-mentioned embodiments, so that structural and logical replacements and changes can be made without departing from the scope of this disclosure.

[0114] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A nozzle assembly, characterized in that: include: A nozzle, the nozzle comprising a main flow section and a bending section, the main flow section comprising a main flow portion and a reinforcement portion, the reinforcement portion being connected to an outer peripheral wall of the main flow portion, the main flow portion being provided with a first flow channel, the bending section being provided with a second flow channel and a third flow channel, the second flow channel being located between the first flow channel and the third flow channel; and A flow guide member is arranged in the bending section, the diameter of the flow surface of the first flow channel is larger than the diameter of the circumscribed circle of the flow guide member, and the bending section is bent relative to the main flow section so that the flow guide member can be installed in the second flow channel.

2. The nozzle assembly according to claim 1, characterized in that The nozzle also includes a connecting section, which connects the bending section and the main flow section. The connecting section is provided with a fourth flow channel, and the diameter of the flow surface of the fourth flow channel near the outlet of the second flow channel is smaller than the diameter of the circumscribed circle of the guide member.

3. The nozzle assembly according to claim 1, characterized in that The diameter of the flow surface of the third flow channel near the inlet of the second flow channel is smaller than the diameter of the circumscribed circle of the flow guide member.

4. The nozzle assembly according to claim 1, characterized in that The diameter of at least part of the flow surface of the second flow channel is larger than the diameter of the circumscribed circle of the flow guide, and in the direction of liquid flow in the nozzle, the length of the second flow channel is larger than the length of the flow guide.

5. The nozzle assembly according to claim 1, characterized in that The value range of the angle between the extension direction of the second flow channel and the extension direction of the first flow channel is [100°, 145°].

6. The nozzle assembly according to claim 1, characterized in that In the direction of liquid flow in the nozzle, the area of ​​at least a portion of the flow surface of the second flow channel is configured to gradually decrease.

7. The nozzle assembly according to claim 1, characterized in that The bending section is also provided with a fifth flow channel. In the direction of liquid flow in the nozzle, the second flow channel, the fifth flow channel and the third flow channel are connected and communicated in sequence. The flow guide is constructed so that the area of ​​the flow surface of the fluid in the fifth flow channel is larger than the area of ​​the flow surface before entering the fifth flow channel. In the direction of liquid flow in the nozzle, the area of ​​the flow surface of the fifth flow channel is constructed to gradually decrease, and the area of ​​the flow surface of the third flow channel is smaller than the area of ​​the flow surface of the second flow channel.

8. The nozzle assembly according to claim 7, characterized in that The contraction angle of the fifth flow channel has a value range of [30°, 180°].

9. The nozzle assembly according to claim 7, characterized in that In the direction of liquid flow in the nozzle, the area of ​​the flow surface of the third flow channel is configured to gradually increase.

10. The nozzle assembly according to claim 9, characterized in that The expansion angle of the third flow channel has a value range of [0°, 15°].

11. The nozzle assembly according to claim 1, characterized in that 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.

12. The nozzle assembly according to claim 11, characterized in that The blade group includes a plurality of blades, and the blade includes an end portion away from the outer peripheral wall of the guide column, and a buffer is provided on the end portion.

13. The nozzle assembly according to claim 11, characterized in that The guide column includes a column body and a guide portion. The column body is closer to the third 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.

14. The nozzle assembly according to claim 13, characterized in that The diameter of the column is less than or equal to 0.5D, where D is the diameter of the inner wall of the second flow channel.

15. The nozzle assembly according to claim 11, characterized in that The blade group includes a plurality of blades; the impeller includes a plurality of the blade groups, and the plurality of the 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 body of the guide column to the other end of the column body.

16. The nozzle assembly according to claim 11, characterized in that 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.

17. The nozzle assembly according to claim 11, characterized in that The blade group includes a plurality of 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 in a spiral direction compared to the extension direction of the guide column.

18. The nozzle assembly according to claim 11, characterized in that The length L of the impeller has a value range of [5d, 10d], where d is the diameter of the middle position of the guide column.

19. The nozzle assembly according to claim 11, characterized in that 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.

20. The nozzle assembly of claim 11, wherein: In the case where there are multiple blade groups, in the extension direction of the guide column, the width of the blades has a value range of [0.5d, 2.0d], wherein d is the diameter of the middle position of the guide column.

21. The nozzle assembly according to claim 1, characterized in that The minimum diameter of the third flow channel is less than or equal to 1.0 mm.

22. The nozzle assembly of claim 1, wherein: The flow guide is configured to make the area of ​​the flow surface of the fluid in the second flow channel decrease, increase, decrease, and increase in sequence in the direction of liquid flow in the nozzle.

23. A dental flosser, characterized in that: include: body; and The nozzle assembly according to any one of claims 1 to 22, wherein the nozzle assembly is connected to the fuselage.

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