Nozzle and oral irrigator

Abstract

The nozzle is provided with a first end and a second end, the first end is located on the upstream of the second end, the first end is provided with a water inlet, the second end is provided with a water outlet, a first flow channel, a second flow channel and a third flow channel which are sequentially communicated are formed in the nozzle, the water inlet is communicated with the first flow channel, and the water outlet is communicated with the third flow channel. The cross-sectional area of the first flow channel is larger than that of the second flow channel, and the cross-sectional area of the second flow channel is larger than that of the third flow channel. In this way, the nozzle forms a cavitation structure, so that water flowing through the nozzle forms cavitation jet flow and is sprayed out of the nozzle, and the oral cavity of a user is cleaned. According to the nozzle, the cleaning effect of the oral irrigator can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oral cleaning, in particular to a nozzle and a water flosser. Background Art

[0002] As people pay more and more attention to oral hygiene and oral cleaning, water flossers, as a new oral cleaning tool, help users clean the gaps between teeth and gums, and are becoming more and more popular. However, current water flossers have problems such as poor cleaning effect and may cause bleeding gums of users, which has affected their further popularization in people's daily oral care. Utility Model Content

[0003] The utility model provides a nozzle for a water flosser, which can improve the cleaning effect of the water flosser.

[0004] To achieve the above-mentioned purpose, the utility model proposes a nozzle, which has a first end and a second end, the first end is located upstream of the second end, the first end has a water inlet, the second end has a water outlet, and a first flow channel, a second flow channel and a third flow channel connected in sequence are formed in the nozzle, the water inlet is connected to the first flow channel, the water outlet is connected to the third flow channel, the cross-sectional area of ​​the first flow channel is larger than the cross-sectional area of ​​the second flow channel, and the cross-sectional area of ​​the second flow channel is larger than the cross-sectional area of ​​the third flow channel.

[0005] In one embodiment, the length of the second flow channel is L2, satisfying 1mm≤L2≤8mm, the length range of the third flow channel is L3, satisfying 1mm≤L3≤3mm, and satisfying 0.5≤L2 / L3≤2.

[0006] In one embodiment, the cross-sectional area of ​​the first flow channel is S1, which satisfies 7 mm 2 ≤S1≤9mm 2 The cross-sectional area of ​​the second flow channel is S2, which satisfies 0.7mm 2 ≤S2≤5mm 2 The cross-sectional area of ​​the third flow channel is S3, which satisfies 0.38mm 2 ≤S3≤1.54mm 2 , and the ratio of the cross-sectional area of ​​the second flow channel to the cross-sectional area of ​​the third flow channel satisfies 2≤S2 / S3≤5.

[0007] In one embodiment, the length of the first flow channel is L1, the length of the second flow channel is L2, and the length range of the third flow channel is L3, satisfying 80mm≤L1+L2+L3≤150mm, and 4mm≤L2+L3≤20mm.

[0008] In one embodiment, the diameter of the second flow channel is D2 and the length is L2, satisfying 10≥L2 / D2≥1, and / or the diameter of the third flow channel is D3 and the length is L3, satisfying 10≥L3 / D3≥1.

[0009] In one embodiment, a first transition channel is formed between the first channel and the second channel, and the cross-sectional area of ​​the first transition channel gradually decreases to allow a smooth transition between the first channel and the second channel; and / or a second transition channel is formed between the second channel and the third channel, and the cross-sectional area of ​​the second transition channel gradually decreases to allow a smooth transition between the second channel and the third channel.

[0010] In one embodiment, a ratio of the length of the first transition channel to the length of the second channel is in a range of 0.1-0.6.

[0011] In one embodiment, the ratio of the length of the second transition channel to the length of the third channel is in the range of 0.1-1.

[0012] In one embodiment, the cross-sectional area of ​​the second flow channel gradually increases in the direction of water flow; or, the cross-sectional area of ​​the second flow channel remains unchanged in the direction of water flow.

[0013] In one embodiment, the cross-sectional area of ​​the third flow channel gradually increases in the direction of water flow; or, the cross-sectional area of ​​the third flow channel remains unchanged in the direction of water flow.

[0014] In one embodiment, the cross-sectional areas of the first flow channel and the second flow channel in the direction of water flow remain unchanged; or, the cross-sectional area of ​​the first flow channel gradually decreases in the direction of water flow, and the cross-sectional area of ​​the second flow channel in the direction of water flow remains unchanged; or, the cross-sectional area of ​​the first flow channel gradually decreases in the direction of water flow, and the cross-sectional area of ​​the second flow channel gradually increases in the direction of water flow.

[0015] In one embodiment, the cross-sectional areas of the second flow channel and the third flow channel in the direction of water flow gradually increase; or, the cross-sectional area of ​​the second flow channel in the direction of water flow remains unchanged, and the cross-sectional area of ​​the third flow channel in the direction of water flow gradually increases; or, the cross-sectional area of ​​the second flow channel in the direction of water flow gradually increases, and the cross-sectional area of ​​the third flow channel in the direction of water flow remains unchanged.

[0016] In one embodiment, the first flow channel and the second flow channel are connected through a first transition port, the second flow channel and the third flow channel are connected through a second transition port, and the cross-sectional area of ​​the first transition port is 0.18 mm 2 -0.32mm 2, and / or the cross-sectional area of ​​the second transition port is in the range of 0.24mm 2 -0.38mm 2 .

[0017] In one embodiment, the nozzle includes a straight tube portion and an extension portion, the extension portion is bent relative to the straight tube portion, the straight tube portion has the first end, the extension portion has the second end, and the extension portion has the second flow channel, the third flow channel and at least a portion of the first flow channel.

[0018] In one embodiment, the nozzle includes a straight tube portion and an extension portion, the extension portion is bent relative to the straight tube portion, the straight tube portion extends along a first direction, the second direction is perpendicular to the first direction and to the extension portion, and in the extension direction of the third flow channel, the size of the third flow channel in the first direction gradually increases, and the size of the third flow channel in the second direction remains unchanged, so that the water outlet is formed into a slit shape.

[0019] In one embodiment, an angle between a channel wall of the third channel and a central axis of the third channel is between 0° and 8°.

[0020] The utility model also provides a water flosser, comprising the nozzle. The nozzle has a first end and a second end, the first end is located upstream of the second end, the first end has a water inlet, the second end has a water outlet, a first flow channel, a second flow channel and a third flow channel connected in sequence are formed in the nozzle, the water inlet is connected to the first flow channel, the water outlet is connected to the third flow channel, the cross-sectional area of ​​the first flow channel is larger than the cross-sectional area of ​​the second flow channel, and the cross-sectional area of ​​the second flow channel is larger than the cross-sectional area of ​​the third flow channel.

[0021] The technical solution of the utility model forms a cavitation structure by arranging the first flow channel, the second flow channel and the third flow channel with successively decreasing water flow areas in the nozzle, so that the water flowing through the nozzle forms a cavitation jet and is ejected from the water outlet to clean the user's oral cavity, thereby enhancing the cleaning effect. At the same time, the pumping pressure of the pump body in the main unit of the water flosser can remain unchanged, thereby ensuring the comfort of the user when using the nozzle, and preventing problems such as bleeding gums. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 This is a schematic structural diagram of an embodiment of the nozzle of the utility model;

[0024] Figure 2 for Figure 1 A cross-sectional view of the middle nozzle;

[0025] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 It is a schematic diagram of the nozzle size of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the first form of the water outlet channel of the nozzle of the utility model;

[0028] Figure 6 It is a structural schematic diagram of the second form of the water outlet channel of the nozzle of the utility model;

[0029] Figure 7 It is a schematic structural diagram of the third form of the water outlet channel of the nozzle of the utility model;

[0030] Figure 8 This is a schematic structural diagram of another embodiment of the nozzle of the utility model;

[0031] Fig. 9 for Figure 8 Enlarged view of point B in the middle.

[0032] Description of Figure Numbers:

[0033] Label name Label name 10 nozzle 130 The third flow channel 100 main body 140 Water Inlet 101 Straight pipe department 150 First transition port 102 Extension 160 Second transition port 100a First End 170 Water outlet 100b Second end 210 First transition channel 110 First runner 220 Second transition channel 120 Second flow channel M Outlet channel

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0038] The embodiment of the present application provides a nozzle, which is used for a water flosser. The water flosser can spray a continuous water column or a water column containing bubbles at high speed from the water outlet of the water flosser and the water flosser nozzle, directly impacting the user's gums and teeth, and using the force of the water column to clean the oral cavity residues and dental plaque. At present, there is a conflicting demand for cleaning power and comfort in water flossers. When the cleaning power is too weak, the user is more comfortable to use, but the cleaning effect is not obvious. When the cleaning power is too strong, the cleaning effect is better, but it is easy to cause problems such as bleeding gums of the user, which affects the further popularization of water flossers in people's daily oral care.

[0039] In order to achieve higher cleaning efficiency and a softer flushing experience, cavitation structures are gradually introduced into the design of the flow channel of the water flosser nozzle. Cavitation here refers to the process of gas nuclei in the water growing into bubbles when the local pressure in the flow channel drops to the critical pressure (generally close to the vaporization pressure), and the accumulation, flow, splitting and collapse of bubbles. The energy generated by the cavitation bubble explosion can effectively remove plaque.

[0040] See also Figures 1 to 9 In one embodiment of the utility model, the nozzle 10 has a first end 110a and a second end 110b, the first end 110a is located upstream of the second end 100b, the first end 110a has a water inlet, and the second end 100b has a water outlet 170. A first flow channel 110, a second flow channel 120 and a third flow channel 130 which are connected in sequence are formed in the nozzle 10, the water inlet 140 is connected to the first flow channel 110, the water outlet 170 is connected to the third flow channel 130, the cross-sectional area of ​​the first flow channel 110 is greater than the cross-sectional area of ​​the second flow channel 120, and the cross-sectional area of ​​the second flow channel 120 is greater than the cross-sectional area of ​​the third flow channel 130.

[0041] Specifically, the nozzle 10 includes a main body 100, and the main body 100 has a first end 100a and a second end 100b along its length direction. The first end 100a is used to connect to the main unit of the water flosser, so that the user can install a variety of nozzles with different effects and types for the same water flosser main unit for the user to choose and use. Optionally, the nozzle 10 and the main unit can be snapped together, which is simple and convenient to operate. In the direction perpendicular to the length direction of the main body 100, the shape of the cross-section of the main body 100 can be circular, square, diamond or other special shapes, which is not specifically limited. The material of the main body 100 can be transparent so that the user can clearly see the water flow in the water outlet channel M (please refer to Figure 2 or Figure 4 ), or the material of the main body 100 can be a non-transparent material, which is not specifically limited. In addition, the main body 100 can be set in a straight tube shape, or one end of the main body 100 can be set in a curved tube shape, which is not specifically limited. Usually, for the convenience of users, the position of the main body 100 near the second end 100b can be hot-bent using a tooling fixture to facilitate users to rinse and clean the oral cavity.

[0042] See also Figures 1 to 3 A first flow channel 110, a second flow channel 120 and a third flow channel 130 are sequentially arranged on a path from the first end 100a toward the second end 100b in the main body 100. The first flow channel 110, the second flow channel 120 and the third flow channel 130 are sequentially connected to form a water outlet flow channel M of the nozzle 10, wherein one end of the first flow channel 110 is a water inlet 140 of the water outlet flow channel M, and the other end of the third flow channel 130 is a water outlet 170 of the water outlet flow channel M. A first transition port 150 and a second transition port 160 are arranged in the water outlet flow channel M, the first transition port 150 connects the first flow channel 110 and the second flow channel 120, and the second transition port 160 connects the second flow channel 120 and the third flow channel 130. The water flowing into the water outlet channel M from the water inlet 140 will flow through the first channel 110, the first transition port 150, the second channel 120, the second transition port 160, the third channel 130 in sequence, and finally flow out of the water outlet 170. It should be emphasized that the shapes of the first channel 110, the second channel 120 and the third channel 130 can be circular channels, directional channels, diamond channels or channels of other shapes, and the shapes of the first channel 110, the second channel 120 and the third channel 130 can be the same or different, and there is no specific limitation on this.

[0043] The main unit of the oral irrigator may be provided with a pump body, a water storage space, a water delivery channel, etc. (not shown in the figure). During actual installation, the water inlet of the pump body is connected to the water storage space, and the water outlet of the pump body is connected to the water delivery channel. When the pump body is working, the water or other liquid stored in the water storage space can be pumped out through the water delivery channel, so that the user's oral cavity can be cleaned. During actual use, the nozzle 10 is installed on the main unit, and the water outlet channel M in the main body 100 of the nozzle 10 is connected to the water delivery channel. When the pump body is working, the water or other liquid in the water storage space can be pumped to the water inlet 140 of the nozzle 10, and then sequentially through the first flow channel 110, the second flow channel 120, and the third flow channel 130, and then sprayed out through the water outlet 170 to clean the user's oral cavity.

[0044] See also Figure 3 , further, the cross-sectional area of ​​the first flow channel 110 is larger than the cross-sectional area of ​​the second flow channel 120, and the cross-sectional area of ​​the second flow channel 120 is larger than the cross-sectional area of ​​the third flow channel 130. With such a design, the cross-sectional area of ​​the water flowing from the first flow channel 110 to the second flow channel 120 is smaller, and the sudden contraction of the flow channel will generate a pressure pulse, which is reflected to the second flow channel 120, and superimposed with the pressure pulse of the water flow pumped by the pump body in the first flow channel 110 to form a standing wave. When the excitation frequency is the same as the eigenfrequency of the second flow channel 120, resonance will be formed, so that the second flow channel 120 forms a resonance cavity, increasing the pressure pulsation of the second flow channel 120, and finally making the pressure in more areas of the third flow channel 130 less than the saturated vapor pressure of water vapor, thereby inducing the generation of more cavitation bubbles, which gradually grow and develop in the third flow channel 130 as the air pressure decreases, and finally making the third flow channel 130 pulsate more violently, forming a cavitation jet and spraying out from the water outlet 170, thereby enhancing the cleaning effect of the water flosser.

[0045] Furthermore, the application of the aforementioned cavitation structure in the water outlet flow channel M can ensure the comfort of the user during use. Compared with the cavitation structure nozzles currently on the market, which are mainly based on Venturi tubes (the combination of contraction and expansion is used to change the inner diameter of the pipeline to cause internal hydraulic changes, when the pressure of the liquid flowing through the contraction section is lower than the saturated vapor pressure, bubbles will precipitate, and when moving to the expansion area, they will be squeezed and broken due to the increase in hydraulic pressure), self-oscillation cavitation (the main structure is the Helmholtz nozzle), organ pipes, turbulence, shear, gas mixing, ultrasonic and other forms of cavitation structure nozzles.

[0046] It should be noted that cavitation jet refers to the use of nozzle 10 to generate a large number of bubbles in the water jet. When the bubbles approach the solid surface, a high-pressure stagnation zone is generated and the bubbles are rapidly broken. Due to the huge energy generated by the bubble breakage, it acts on a very small area, resulting in extremely high stress concentration, thereby causing damage to the surface of the impacted object. It is this local pressure increase and energy concentration that make the cavitation jet have a better erosion cleaning effect than the non-cavitation jet under the same pump pressure and flow rate conditions.

[0047] The principle of the cavitation nozzle is that when a stable fluid passes through, the contraction surface in the flow channel can not only cause the fluid to generate initial pressure excitation, but also feed back the pressure excitation to the resonant cavity to form feedback pressure oscillations. According to transient flow theory and hydroacoustic principles, if the frequency of the pressure excitation matches the natural frequency of the nozzle resonant cavity (equivalent to the second flow channel 120 of the present application), the feedback pressure oscillation can be amplified, thereby generating fluid resonance in the resonant cavity to form standing waves. The frequency of the resonant standing wave is similar to the critical self-excited structure frequency of the jet, which can turn the jet shear layer vortex into a large structure separated annular vortex. This large structured intermittent vortex circulation can enhance the cavitation effect, that is, a large structured intermittent vortex circulation and a high-intensity cavitation jet are generated at the outlet, thereby improving its erosion and cleaning capabilities.

[0048] The technical solution of the utility model forms a cavitation structure by arranging the first flow channel 110, the second flow channel 120 and the third flow channel 130 with successively decreasing water flow areas in the nozzle 10, so that the water flowing through the nozzle 10 forms a cavitation jet and is ejected from the water outlet 170 to clean the user's oral cavity, thereby increasing the cleaning effect of the nozzle 10. At the same time, the pumping pressure of the pump body in the main unit of the water flosser can remain unchanged, thereby ensuring the comfort of the user when using the nozzle 10, and avoiding problems such as bleeding gums caused by blindly increasing the pumping pressure of the pump body to improve the cleaning effect. Furthermore, the nozzle 10 has a simple structure, a reasonable design, and is easy to manufacture.

[0049] See also Figure 4 In one embodiment, the length of the second flow channel 120 is L2, which satisfies 1mm≤L2≤8mm, and the length range of the third flow channel 130 is L3, which satisfies 1mm≤L3≤3mm, and satisfies 0.5≤L2 / L3≤2. Specifically, the length of the second flow channel 120 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, or other values ​​in the range of 1mm-8mm, and the length of the third flow channel 130 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or other values ​​in the range of 1mm-3mm, and there is no specific limitation on this. In this embodiment, the ratio of the length of the second flow channel 120 to the length of the third flow channel 130, i.e., L2 / L3, satisfies 0.5≤L2 / L3≤2. Within this range, the cavitation effect of the nozzle 10 is good, thereby ensuring the cleaning effect of the water flosser.

[0050] See also Figure 3 and Figure 4In one embodiment, the cross-sectional area of ​​the first flow channel 110 is S1, which satisfies 7mm2≤S1≤9mm2, the cross-sectional area of ​​the second flow channel 120 is S2, which satisfies 0.7mm2≤S2≤5mm2, the cross-sectional area of ​​the third flow channel 130 is S3, which satisfies 0.38mm2≤S3≤1.54mm2, and the ratio of the cross-sectional area of ​​the second flow channel 120 to the cross-sectional area of ​​the third flow channel 130 satisfies 2≤S2 / S3≤5. Specifically, when S2 / S3<2, the cavitation effect of the nozzle 10 is not obvious at this time, and when S2 / S3>5, the cavitation effect of the nozzle 10 is too high, the impact force of the water flow is too large, and it is easy to cause bleeding gums of the user. Therefore, when S2 / S3 satisfies 2≤S2 / S3≤5, the cavitation effect of the nozzle 10 is better.

[0051] It is understandable that the cross-sectional area of ​​the first flow channel 110 described above and below refers to the area of ​​the cross section of the first flow channel 110 in the direction perpendicular to the extension direction of the first flow channel 110. If the first flow channel 110 is a straight flow channel, it refers to the area of ​​the cross section of the first flow channel 110 in the radial direction of the first flow channel 110. Similarly, the cross-sectional area of ​​the second flow channel 120 and the cross-sectional area of ​​the third flow channel 130 are defined in the same way as the cross-sectional area of ​​the first flow channel 110, and will not be described in detail here. Among them, the minimum cross-sectional area of ​​the first flow channel 110, the second flow channel 120 and the third flow channel 130 refers to the cross-sectional area of ​​the smallest cross section among the multiple cross sections of the first flow channel 110, the second flow channel 120 and the third flow channel 130.

[0052] See also Figure 2 and Figure 4 In one embodiment, the length of the first flow channel 110 is L1, satisfying L1>L2>L3, and L1 / 2>(L2+L3). Specifically, the length L1 of the first flow channel 110 refers to the shortest distance between the water inlet 140 and the first transition port 150. Of course, in other embodiments, the length L1 of the first flow channel 110 can also be expressed as the shortest wall length of the side wall between the water inlet 140 and the first transition port 150. Since the water flow entering the nozzle 10 through the main unit of the oral irrigator first flows into the first flow channel 110, in order to create a stable fluid environment, the length of the first flow channel 110 is set to the longest, and half of the length of the first flow channel 110 is greater than the sum of the second flow channel 120 and the third flow channel 130.

[0053] See also Figure 2 and Figure 4In one embodiment, the length of the first flow channel 110 is L1, the length of the second flow channel 120 is L2, and the length range of the third flow channel 130 is L3, which satisfies 80mm≤L1+L2+L3≤150mm, and 4mm≤L2+L3≤20mm. Specifically, considering the pumping pressure of the water pump, the size of the water flosser and other factors, if the overall flow channel in the nozzle 10 is too long, the pumping pressure loss is large and it is not easy to operate. If the overall flow channel is too short, it cannot have a good cleaning effect on the water flosser. Therefore, the sum of the lengths of the first flow channel 110, the second flow channel 120 and the third flow channel 130 is limited to 80-100mm.

[0054] Please continue reading Figure 2 and Figure 4 In one embodiment, the diameter of the second flow channel 120 is D2 and the length is L2, satisfying 10≥L2 / D2≥1, and / or the diameter of the third flow channel 130 is D3 and the length is L3, satisfying 10≥L3 / D3≥1.

[0055] Specifically, D2 refers to the diameter of any point in the second flow channel 120, and D3 refers to the diameter of any point in the third flow channel 130. If the second flow channel and the third flow channel are rectangular flow channels, D2 and D3 can be expressed as the diameter of the long side of the rectangular flow channel, or can also be expressed as the diameter of the short side of the rectangular flow channel, and it is only necessary to ensure that 10≥L2 / D2≥1, 10≥L3 / D3≥1 is satisfied. The length L2 of the second flow channel 120 refers to the shortest distance between the first transition port 150 and the second transition port 160, and the length L3 of the third flow channel 130 refers to the shortest distance between the second transition port 160 and the water outlet 170. Of course, in other embodiments, the length L2 of the second flow channel 120 can also be expressed as the shortest wall length of the side wall between the first transition port 150 and the second transition port 160. Similarly, the length L3 of the third flow channel 130 can also be expressed as the shortest wall length of the side wall between the second transition port 160 and the water outlet 170.

[0056] In this embodiment, the second flow channel 120 and the third flow channel 130 are both circular flow channels, wherein L2 / D2 is the aspect ratio of the second flow channel 120, and L3 / D3 is the aspect ratio of the third flow channel 130. If the aspect ratio of the second flow channel 120 is too small, the cavitation effect of the nozzle self-excited vibration will be poor; the cross-sectional area of ​​the second flow channel 120 is larger than that of the third flow channel 130, and the loss of water flow intensity due to friction is relatively smaller, so the aspect ratio of the second flow channel 120 can be appropriately larger, but usually will not exceed 10. If the aspect ratio of the third flow channel 130 is too small, the cavitation bubbles will have limited effect in the development and growth of the third flow channel 130; if the aspect ratio of the third flow channel 130 is too large, although the cavitation effect will be increased, the loss of water flow intensity due to friction will be too large, reducing the cleaning effect. Therefore, the aspect ratios of the second flow channel 120 and the third flow channel 130 respectively meet 10≥L2 / D2≥1, 10≥L3 / D3≥1. Preferably, 8≥L2 / D2≥2, 8≥L3 / D3≥2 are satisfied. For example, L2 / D2=2, 3, 4, 5, 6, 7, 8; L3 / D3=2, 3, 4, 5, 6, 7, 8.

[0057] See also Figure 4 and Fig. 9 In one embodiment, a first transition channel 210 is formed between the first channel 110 and the second channel 120, and the cross-sectional area of ​​the first transition channel 210 gradually decreases to allow a smooth transition between the first channel 110 and the second channel 120; and / or, a second transition channel 220 is formed between the second channel 120 and the third channel 130, and the cross-sectional area of ​​the second transition channel 220 gradually decreases to allow a smooth transition between the second channel 120 and the third channel 130.

[0058] Specifically, only the connection between the first flow channel 110 and the second flow channel 120 can be set with a rounded corner, or only the connection between the second flow channel 120 and the third flow channel 130 can be set with a rounded corner. Preferably, the connection between the first flow channel 110 and the second flow channel 120, and the connection between the second flow channel 120 and the third flow channel 130 are both set with rounded corners. The angle of the rounded corner can be 30°, 45° or 60°, or the radius of the rounded corner can be 0.5mm. Such a setting can improve the smoothness of the connection between the first flow channel 110 and the second flow channel 120, and the connection between the second flow channel 120 and the third flow channel 130, can reduce the resistance of the water outlet flow channel M to the liquid, make the flow of the liquid smoother, reduce the energy loss of the liquid, and can increase the flushing force of the liquid on the oral cavity.

[0059] Furthermore, the ratio of the length of the first transition channel 210 to the length of the second channel 120 is in the range of 0.1-0.6. This avoids the first transition channel 210 being too long and thus failing to cavitate the water in the channel, and also avoids the first transition channel 210 being too short and thus causing the water in the first channel 110 to encounter greater resistance in the process of flowing to the second channel 120, thereby affecting the water discharge effect. Similarly, the ratio of the length of the second transition channel 220 to the length of the third channel 130 is in the range of 0.1-1. Its function is the same as that of the first transition channel 210, and will not be described in detail here.

[0060] See also Figures 3 to 7 The cross-sectional areas of the first flow channel 110, the second flow channel 120 and the third flow channel 130 of the present application in the direction of the water flow passing therethrough are in the following forms:

[0061] Form 1: The cross-sectional area of ​​the first flow channel 110 in the water flow direction remains unchanged.

[0062] Form 2: The cross-sectional area of ​​the first flow channel 110 gradually decreases in the water flow direction.

[0063] Form 3: The cross-sectional area of ​​the second flow channel 120 remains unchanged in the water flow direction.

[0064] Form 4: The cross-sectional area of ​​the second flow channel 120 gradually increases in the water flow direction.

[0065] Form 5: The cross-sectional area of ​​the third flow channel 130 remains unchanged in the water flow direction.

[0066] Form 6: The cross-sectional area of ​​the third flow channel 130 gradually increases in the water flow direction.

[0067] Form 7: The cross-sectional area of ​​the first flow channel 110 in the direction of water flow remains unchanged, and the cross-sectional area of ​​the second flow channel 120 in the direction of water flow remains unchanged. (i.e. Form 1+Form 3)

[0068] Form 8: The cross-sectional area of ​​the first flow channel 110 in the direction of water flow remains unchanged, and the cross-sectional area of ​​the second flow channel 120 in the direction of water flow gradually increases. (i.e. Form 1+Form 4)

[0069] Form 9: The cross-sectional area of ​​the first flow channel 110 gradually decreases in the direction of water flow, and the cross-sectional area of ​​the second flow channel 120 remains unchanged in the direction of water flow. (i.e. Form 2+Form 3)

[0070] Form 10: The cross-sectional area of ​​the first flow channel 110 gradually decreases in the direction of water flow, and the cross-sectional area of ​​the second flow channel 120 gradually increases in the direction of water flow. (i.e. Form 2+Form 4)

[0071] Form 11: The cross-sectional area of ​​the second flow channel 120 in the direction of water flow remains unchanged, and the cross-sectional area of ​​the third flow channel 130 in the direction of water flow remains unchanged. (i.e. Form 3+Form 5)

[0072] Form 12: The cross-sectional area of ​​the second flow channel 120 in the direction of water flow remains unchanged, and the cross-sectional area of ​​the third flow channel 130 in the direction of water flow gradually increases. (i.e. Form 3+Form 6)

[0073] Form 13: The cross-sectional area of ​​the second flow channel 120 gradually increases in the direction of water flow, and the cross-sectional area of ​​the third flow channel 130 remains unchanged in the direction of water flow. (i.e. Form 4+Form 5)

[0074] Form 14: The cross-sectional area of ​​the second flow channel 120 gradually increases in the direction of water flow, and the cross-sectional area of ​​the third flow channel 130 gradually increases in the direction of water flow. (i.e. Form 4+Form 6)

[0075] Form 15: The cross-sectional area of ​​the first flow channel 110 in the direction of water flow remains unchanged, the cross-sectional area of ​​the second flow channel 120 in the direction of water flow remains unchanged, and the cross-sectional area of ​​the third flow channel 130 in the direction of water flow remains unchanged. (i.e. Form 1+Form 3+Form 5, see Figure 5 )

[0076] Form 16: The cross-sectional area of ​​the first flow channel 110 in the direction of water flow remains unchanged, the cross-sectional area of ​​the second flow channel 120 in the direction of water flow remains unchanged, and the cross-sectional area of ​​the third flow channel 130 in the direction of water flow gradually increases. (i.e. Form 1+Form 3+Form 6, see Figure 3 )

[0077] Form 17: The cross-sectional area of ​​the first flow channel 110 in the direction of water flow remains unchanged, the cross-sectional area of ​​the second flow channel 120 in the direction of water flow gradually increases, and the cross-sectional area of ​​the third flow channel 130 in the direction of water flow remains unchanged. (i.e. Form 1+Form 4+Form 5, see Figure 7 )

[0078] Form 18: The cross-sectional area of ​​the first flow channel 110 in the direction of water flow remains unchanged, the cross-sectional area of ​​the second flow channel 120 in the direction of water flow gradually increases, and the cross-sectional area of ​​the third flow channel 130 in the direction of water flow gradually increases. (i.e. Form 1+Form 4+Form 6, see Figure 6 )

[0079] Form 19: The cross-sectional area of ​​the first flow channel 110 gradually decreases in the direction of water flow, the cross-sectional area of ​​the second flow channel 120 remains unchanged in the direction of water flow, and the cross-sectional area of ​​the third flow channel 130 remains unchanged in the direction of water flow. (i.e. Form 2+Form 3+Form 5)

[0080] Form 20: The cross-sectional area of ​​the first flow channel 110 gradually decreases in the direction of water flow, the cross-sectional area of ​​the second flow channel 120 remains unchanged in the direction of water flow, and the cross-sectional area of ​​the third flow channel 130 gradually increases in the direction of water flow. (i.e. Form 2+Form 3+Form 6)

[0081] Form 21: The cross-sectional area of ​​the first flow channel 110 gradually decreases in the direction of water flow, the cross-sectional area of ​​the second flow channel 120 gradually increases in the direction of water flow, and the cross-sectional area of ​​the third flow channel 130 remains unchanged in the direction of water flow. (i.e. Form 2+Form 4+Form 5)

[0082] Form 22: The cross-sectional area of ​​the first flow channel 110 gradually decreases in the direction of water flow, the cross-sectional area of ​​the second flow channel 120 gradually increases in the direction of water flow, and the cross-sectional area of ​​the third flow channel 130 gradually increases in the direction of water flow. (i.e. Form 2+Form 4+Form 6)

[0083] Among them, when the cross-sectional area of ​​the first flow channel 110 remains unchanged in the direction of water flow, the stability of the water flow flowing through the first flow channel 110 can be guaranteed; when the cross-sectional area of ​​the second flow channel 120 remains unchanged in the direction of water flow, the stability of the water flow flowing through the second flow channel 120 can be guaranteed; when the cross-sectional area of ​​the third flow channel 130 remains unchanged in the direction of water flow, since the water flows through the first flow channel 110, the second flow channel 120 and the third flow channel 130 with gradually decreasing cross-sectional areas, and the cross-sectional area of ​​the third flow channel 130 remains unchanged in the direction of water flow, the impact force of the water flow finally sprayed out from the water outlet 170 is high, further improving the cleaning effect of the water flosser using the nozzle 10.

[0084] The cross-sectional area of ​​the first flow channel 110 gradually decreases in the direction of water flow. The water flows along the contraction surface in the first flow channel 110 , causing the water flow to generate initial pressure excitement, thereby improving the cavitation effect of the nozzle 10 .

[0085] The cross-sectional area of ​​the second flow channel 120 gradually increases in the direction of water flow, increasing the pressure pulsation of the second flow channel 120, and eventually making the pressure in more areas of the third flow channel 130 less than the saturated vapor pressure of water vapor, thereby inducing the generation of more cavitation bubbles, and eventually making the third flow channel 130 pulsate more violently, forming a cavitation jet and ejecting it from the water outlet 170, thereby enhancing the cleaning effect of the water flosser.

[0086] The cross-sectional area of ​​the third flow channel 130 gradually increases in the direction of water flow. After the water flows into the third flow channel 130, the liquid is in a diffused state after flowing out of the water outlet 170, which can further increase the flushing area after the liquid is sprayed out. In addition, the liquid diffuses and consumes energy. If the ratio of the area of ​​the second transition port 160 to the area of ​​the water outlet 170 is less than 0.45, the liquid diffusion ratio is too large, which will greatly reduce the flushing force of the liquid flowing out of the water outlet 170; if the ratio of the area of ​​the second transition port 160 to the area of ​​the water outlet 170 is greater than 0.8, at this time, the liquid diffusion angle is not enough, which will affect the flushing area of ​​the water flow. Therefore, by making the cross-sectional area of ​​the third flow channel 130 of the nozzle 10 gradually increase along the direction from the second transition port 160 to the liquid outlet, and the ratio of the area of ​​the second transition port 160 to the area of ​​the liquid outlet is 0.45 to 0.8, it can not only ensure the flushing force of the liquid, but also take into account the flushing area of ​​the water flow.

[0087] See also Figure 2 and Figure 3 In one embodiment, in the direction from the first end 100a to the second end 100b, a first flow channel 110, a second flow channel 120 and a third flow channel 130 connected in sequence are formed in the main body 100; the first flow channel 110 has a water inlet 140 arranged at the first end 100a, and a first transition port 150 connecting the first flow channel 110 and the second flow channel 120, and a second transition port 160 connecting the second flow channel 120 and the third flow channel 130 are arranged in the main body 100, and the third flow channel 130 has a water outlet 170 arranged at the second end 100b; wherein the area of ​​the water inlet 140 is greater than the area of ​​the first transition port 150, the area of ​​the first transition port 150 is greater than the area of ​​the second transition port 160, and the area of ​​the second transition port 160 is smaller than the area of ​​the water outlet 170.

[0088] Further, the cross-sectional area of ​​the first transition opening 150 ranges from 0.18 mm2 to 0.32 mm2, and the values ​​thereof may be 0.18 mm2, 0.19 mm2, 0.2 mm2, 0.21 mm2, 0.22 mm2, 0.23 mm2, 0.24 mm2, 0.25 mm2, 0.26 mm2, 0.27 mm2, 0.28 mm2, 0.29 mm2, 0.3 mm2, 0.31 mm2, 0.32 mm2. Preferably, the cross-sectional area of ​​the first transition opening 150 ranges from 0.23 mm2 to 0.28 mm2. The cross-sectional area of ​​the second transition opening 160 ranges from 0.24 mm2 to 0.38 mm2, and the values ​​thereof may be 0.24 mm2, 0.25 mm2, 0.26 mm2, 0.27 mm2, 0.28 mm2, 0.29 mm2, 0.30 mm2, 0.31 mm2, 0.32 mm2, 0.33 mm2, 0.34 mm2, 0.35 mm2, 0.36 mm2, 0.37 mm2, 0.38 mm2. Preferably, the cross-sectional area of ​​the second transition opening 160 ranges from 0.28 mm2 to 0.33 mm2.

[0089] It should be noted that the cross-sectional area of ​​the first transition opening 150 and the second transition opening 160 can be calculated by cutting the main body 100 at the outer wall surface of the main body 100 corresponding to the first transition opening 150 or the second transition opening 160 to obtain a roughly annular cross section of the main body 100. At this time, the area of ​​the cross section formed by the inner ring of the cross section is the cross-sectional area of ​​the first transition opening 150 or the second transition opening 160. If the cross section formed by the inner ring of the cross section is an irregular cross section, the cross section area can be obtained by decomposing the cross section. Similarly, the calculation of the cross-sectional area of ​​the first flow channel 110, the second flow channel 120, the third flow channel 130, the water outlet 170, etc. mentioned above and later can all be calculated in the above manner. Among them, when calculating the cross-sectional area of ​​the first flow channel 110, the second flow channel 120, and the third flow channel 130, the cutting direction of the main body 100 is a direction perpendicular to the extension direction of the corresponding flow channel.

[0090] See also Figure 8 and Fig. 9 In one embodiment, the nozzle 10 includes a straight tube portion 101 and an extension portion 102, the extension portion 102 is bent relative to the straight tube portion 101, the straight tube portion 101 has a first end 100a, the extension portion 102 has a second end 100b, and the extension portion 102 has a second flow channel 120, a third flow channel 130 and at least a portion of the first flow channel 110.

[0091] Specifically, one end of the straight tube 101 is used to connect to the main unit of the oral irrigator, and the extension 102 extends outwardly from the other end of the straight tube 101. When the user uses the oral irrigator, the extension 102, which is at a certain angle to the vertical direction, is more convenient to align with the oral cavity. The first flow channel 110 is arranged in the straight tube 101, and the extension 102 is provided with the second flow channel 120, the third flow channel 130 and at least part of the first flow channel 110. The length of the extension 102 is less than the length of the straight tube 101.

[0092] See also Figure 8 and Fig. 9 In one embodiment, the nozzle 10 includes a straight tube portion 101 and an extension portion 102, the extension portion 102 is bent relative to the straight tube portion 101, the straight tube portion 101 extends along a first direction, the second direction is perpendicular to the first direction and perpendicular to the extension portion 102, and in the extension direction of the third flow channel 130, the size of the third flow channel 130 in the first direction gradually increases, and the size of the third flow channel 130 in the second direction remains unchanged, so that the water outlet 170 is formed into a slit shape.

[0093] Specifically, one end of the straight tube 101 is used to connect to the main unit of the oral irrigator, and the extension 102 extends outwardly from the other end of the straight tube 101. When the user uses the oral irrigator, the extension 102 at a certain angle to the vertical direction makes it easier to align the oral cavity. The first direction refers to the direction in which the straight tube 101 extends, and the second direction is a direction perpendicular to both the extension 102 and the straight tube 101.

[0094] Since the water outlet 170 is a slit-shaped water outlet 170 (the slit-shaped water outlet 170 is not shown in the figure), the length of the water outlet 170 is greater than the width. Compared with water outlets of other shapes, such as a circular water outlet or a square water outlet, when the size of the water outlet 170 (the area of ​​the water outlet 170) is the same, the area flushed by the liquid flowing out of the slit-shaped water outlet 170 will be larger than the area flushed by the circular water outlet or the square water outlet when moving the same distance. At the same time, the water outlet 170 extends from the top to the bottom of the end of the main body 100 where the water outlet 170 is provided. When the nozzle 10 is used, the extension direction of the flushing end face from the bottom to the top is consistent with the extension direction of the tooth gap. The water column flowing out of the water outlet 170 is thinner and easier to flow into the tooth gap, resulting in a better flushing effect. That is to say, the water outlet 170 is set to be in a slit shape, and the water outlet 170 extends from the top to the bottom of the end of the main body where the water outlet 170 is provided. This can not only increase the outflow rate and flushing force of the liquid, but also increase the flushing area during the use of the nozzle. It can take into account both the flushing force and the flushing range at the same time, facilitate the injection of the water column into the user's teeth, and provide a better user experience.

[0095] See also Figure 3 and Figure 4 , further, in the direction from the second transition port 160 to the water outlet 170, the channel wall of the third flow channel 130 forms an angle α with the central axis of the third flow channel 130, satisfying 8°≥α≥0°. Specifically, the cross-section of the third flow channel 130 is circular, the central axis of the third flow channel 130 is a virtual axis, and in the direction from the second transition port 160 to the water outlet 170, the channel wall of the third flow channel 130 forms an angle α with the central axis of the third flow channel 130, satisfying 8°≥α≥0°. The angle α here is half of the expansion angle of the third flow channel 130, that is, the expansion angle of the first flow channel 110 is 2α. If the third flow channel 130 is arranged in a square or other shape, the angle α is formed by the channel wall of the third flow channel 130 and the center line of the third flow channel 130. Preferably, the angle α satisfies 6°≥α≥3°. For example, α=3°, 4°, 5°, 6°, and correspondingly, the expansion angle of the third flow channel 130 may be 6°, 8°, 10°, or 12°.

[0096] In a specific embodiment of the present utility model, the cross-sectional area of ​​the water outlet 170 is 0.45 mm2, the minimum cross-sectional area of ​​the third flow channel 130 is 0.3 mm2, the expansion angle of the third flow channel 130 is 6°, the length of the third flow channel 130 is 1.3 mm, and the length of the main body 100 of the nozzle 10 is 88.6 mm.

[0097] In another specific embodiment, the cross-sectional area of ​​the water outlet 170 is 1.185 mm2, the minimum cross-sectional area of ​​the third flow channel 130 is 0.3 mm2, the expansion angle of the third flow channel 130 is 12°, the length of the third flow channel 130 is 2.9 mm, and the length of the main body 100 of the nozzle 10 is 90.2 mm.

[0098] The difference between the diameters of the first flow channel 110 and the second flow channel 120 may be approximately 2 mm, and the diameter of the first flow channel 110 is set to D1, which is approximately 3.2 mm.

[0099] After actual testing, the cleaning power of the nozzle 10 of the above embodiment is significantly improved compared with the cleaning power of ordinary nozzles. Some test results are shown in the following Table 1.1.

[0100] Table 11 Comparison between standard nozzle and nozzle of this application

[0101]

[0102]

[0103] It can be clearly seen from the data in the above table that the impact force and cleaning power of the nozzle 10 of the present application are significantly better than those of ordinary standard nozzles, and the expansion angle of the nozzle water spray section (i.e., the third flow channel 130) and the length of the water spray section flow channel have a great influence on the cleaning power of the nozzle 10, among which the nozzle 2 has a stronger cleaning power.

[0104] The utility model also provides a water flosser, which includes a main unit and a nozzle, and the nozzle is detachably connected to the main unit. The specific structure of the nozzle refers to the above embodiment. Since the water flosser can adopt the technical solution of any of the above embodiments, it can at least have all the beneficial effects brought by the technical solution of the above embodiments, which will not be described one by one here.

[0105] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A nozzle, characterized in that: The nozzle has a first end and a second end, the first end is located upstream of the second end, the first end has a water inlet, and the second end has a water outlet. A first flow channel, a second flow channel, and a third flow channel that are connected in sequence are formed in the nozzle, the water inlet is connected to the first flow channel, the water outlet is connected to the third flow channel, the cross-sectional area of ​​the first flow channel is larger than the cross-sectional area of ​​the second flow channel, and the cross-sectional area of ​​the second flow channel is larger than the cross-sectional area of ​​the third flow channel.

2. The nozzle according to claim 1, characterized in that The length of the second flow channel is L2, satisfying 1mm≤L2≤8mm, and the length range of the third flow channel is L3, satisfying 1mm≤L3≤3mm, and satisfying 0.5≤L2 / L3≤2.

3. The nozzle according to claim 1, characterized in that The cross-sectional area of ​​the first flow channel is S1, which satisfies 7mm 2 ≤S1≤9mm 2 The cross-sectional area of ​​the second flow channel is S2, which satisfies 0.7mm 2 ≤S2≤5mm 2 The cross-sectional area of ​​the third flow channel is S3, which satisfies 0.38mm 2 ≤S3≤1.54mm 2 , and the ratio of the cross-sectional area of ​​the second flow channel to the cross-sectional area of ​​the third flow channel satisfies 2≤S2 / S3≤5.

4. The nozzle according to claim 1, characterized in that The length of the first flow channel is L1, the length of the second flow channel is L2, and the length range of the third flow channel is L3, satisfying 80mm≤L1+L2+L3≤150mm, and 4mm≤L2+L3≤20mm.

5. The nozzle according to claim 1, characterized in that The diameter of the second flow channel is D2 and the length is L2, satisfying 10≥L2 / D2≥1, and / or the diameter of the third flow channel is D3 and the length is L3, satisfying 10≥L3 / D3≥1.

6. The nozzle according to claim 1, characterized in that A first transition channel is formed between the first channel and the second channel, and the cross-sectional area of ​​the first transition channel gradually decreases to allow a smooth transition between the first channel and the second channel; and / or a second transition channel is formed between the second channel and the third channel, and the cross-sectional area of ​​the second transition channel gradually decreases to allow a smooth transition between the second channel and the third channel.

7. The nozzle according to claim 6, characterized in that The ratio of the length of the first transition channel to the length of the second channel is in the range of 0.1-0.

6.

8. The nozzle according to claim 6, characterized in that The ratio of the length of the second transition channel to the length of the third channel is in the range of 0.1-1.

9. The nozzle according to claim 1, characterized in that The cross-sectional area of ​​the second flow channel gradually increases in the direction of water flow; or, the cross-sectional area of ​​the second flow channel remains unchanged in the direction of water flow.

10. The nozzle according to claim 1, characterized in that The cross-sectional area of ​​the third flow channel gradually increases in the direction of water flow; or, the cross-sectional area of ​​the third flow channel remains unchanged in the direction of water flow.

11. The nozzle according to claim 1, characterized in that The cross-sectional areas of the first flow channel and the second flow channel in the direction of water flow remain unchanged; or, the cross-sectional area of ​​the first flow channel gradually decreases in the direction of water flow, and the cross-sectional area of ​​the second flow channel in the direction of water flow remains unchanged; or, the cross-sectional area of ​​the first flow channel gradually decreases in the direction of water flow, and the cross-sectional area of ​​the second flow channel gradually increases in the direction of water flow.

12. The nozzle according to claim 1, characterized in that The cross-sectional areas of the second flow channel and the third flow channel in the direction of water flow gradually increase; or, the cross-sectional area of ​​the second flow channel in the direction of water flow remains unchanged, and the cross-sectional area of ​​the third flow channel in the direction of water flow gradually increases; or, the cross-sectional area of ​​the second flow channel in the direction of water flow gradually increases, and the cross-sectional area of ​​the third flow channel in the direction of water flow remains unchanged.

13. The nozzle according to claim 1, characterized in that Therefore, the first flow channel and the second flow channel are connected through the first transition port, the second flow channel and the third flow channel are connected through the second transition port, and the cross-sectional area range of the first transition port is 0.18 mm 2 -0.32mm 2 , and / or the cross-sectional area of ​​the second transition port is in the range of 0.24mm 2 -0.38mm 2 .

14. The nozzle according to claim 1, characterized in that The nozzle includes a straight tube portion and an extension portion, wherein the extension portion is bent relative to the straight tube portion, the straight tube portion has the first end, the extension portion has the second end, and the extension portion has the second flow channel, the third flow channel and at least a portion of the first flow channel.

15. The nozzle according to claim 1, characterized in that The nozzle includes a straight tube portion and an extension portion, the extension portion is bent relative to the straight tube portion, the straight tube portion extends along a first direction, the second direction is perpendicular to the first direction and to the extension portion, and in the extension direction of the third flow channel, the size of the third flow channel in the first direction gradually increases, and the size of the third flow channel in the second direction remains unchanged, so that the water outlet is formed into a slit shape.

16. The nozzle according to claim 1, characterized in that An angle between a channel wall of the third channel and a central axis of the third channel is between 0° and 8°.

17. A water flosser, characterized in that: Comprising a nozzle as claimed in any one of claims 1 to 16.

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