Oral care appliance

Abstract

An oral care appliance, comprising: a fluid power mechanism, configured to provide power to a fluid output by a fluid source; and a base body (1), at least part of the base body (1) being configured to surround and define a conveying structure portion. The conveying structure portion comprises a first flow channel (11), a cavity region (13) and a second flow channel (12), which are communicated in sequence. The first flow channel (11) is configured to be used for receiving the fluid fed by the fluid power mechanism, and the areas of cross sections of an outlet end of the first flow channel (11) and an inlet end of the second flow channel (12) perpendicular to the central axis of extension are both smaller than the area of any cross section of the cavity region (13) perpendicular to the central axis of extension, such that the fluid flowing into the cavity region (13) can form a self-excited oscillation pulse flow and further generate a cavitation effect. The second flow channel (12) is configured to be used for jetting the fluid generating the cavitation effect. Therefore, the oral care appliance can generate jet water columns having a good cleaning effect and can also avoid the problem of poor user experience caused by gum bleeding in gum-sensitive people.

Description

Oral care devices Technical Field

[0001] The present invention relates to the technical field of oral care, and in particular to an oral care appliance. Background Art

[0002] The existing water flosser only has a flow-limiting hole at the nozzle to provide a jet of water to clean the user's mouth. However, the jet of water is difficult to produce a good cleaning effect and is prone to causing bleeding gums for people with sensitive gums, resulting in a poor user experience.

[0003] Summary of the Invention

[0004] The main purpose of the present invention is to provide an oral care device to solve the problem that the jet water column generated by the water irrigator in the prior art is difficult to produce a good cleaning effect, and is likely to cause bleeding gums in people with sensitive gums, resulting in a poor user experience.

[0005] In order to achieve the above-mentioned objectives, the present invention provides an oral care device, comprising: a fluid power mechanism, configured to provide power for a fluid output by a fluid source; a delivery structure, configured to deliver fluid; a base, at least a portion of which is configured to surround and define the delivery structure, the delivery structure having an extended central axis extending along the length of the base; wherein the delivery structure comprises a first flow channel, a cavity area, and a second flow channel connected in sequence, the first flow channel being configured to receive the fluid input by the fluid power mechanism, the cross-sectional areas of the outlet end of the first flow channel and the inlet end of the second flow channel perpendicular to the extended central axis being smaller than the area of ​​any cross-section of the cavity area perpendicular to the extended central axis, so that the fluid flowing into the cavity area can form a self-excited oscillating pulse flow and produce a cavitation effect, and the second flow channel is configured to be used for ejecting the fluid that produces the cavitation effect.

[0006] Furthermore, the ratio of the length L5 of the cavity area to the inner diameter D is greater than or equal to 0.2 and less than or equal to 0.9; wherein, the distance between the outlet end of the first flow channel and the inlet end of the second flow channel forms the length L5 of the cavity area, and the equivalent diameter of the cross section of the cavity area forms the inner diameter D.

[0007] Further, the length L5 of the cavity region is configured to be: 0.6 mm≦L5≦1.2 mm; and / or the inner diameter D of the cavity region is configured to be: 1.33 mm≦D≦3 mm.

[0008] Furthermore, the cross-sectional area of ​​the inlet end of the second flow channel is greater than or equal to the cross-sectional area of ​​the outlet end of the first flow channel.

[0009] Furthermore, along the extension center axis, in the direction from the first flow channel to the second flow channel, the cross section of the cavity region perpendicular to the extension center axis gradually decreases or remains unchanged or first increases and then decreases.

[0010] Furthermore, the cross-section of the cavity area perpendicular to the extension center axis gradually decreases, and a preset plane parallel to the extension center axis intersects with the inner wall of the cavity area arranged around the extension center axis to form a first intersection line and a second intersection line. There is an angle A4 between the first intersection line and the second intersection line, and the angle A4 is configured as: 110°≤A4≤135°.

[0011] Furthermore, from the inlet end of the second flow channel to the outlet end of the second flow channel, the cross-sectional area of ​​the second flow channel perpendicular to the extension central axis gradually increases.

[0012] Furthermore, in the second flow channel, a preset plane parallel to the extended central axis intersects with the inner wall of the second flow channel arranged around the extended central axis to form a third intersection line and a fourth intersection line. There is an angle A3 between the third intersection line and the fourth intersection line, and the angle A3 is configured as: 6°≤A3≤8°.

[0013] Furthermore, the second flow channel has a length L3 on the extended central axis, and the length L3 is configured as: L3 = (D5-D4) / 2×cot(A3 / 2) mm; wherein D5 is the inner diameter of the outlet end of the second flow channel, and D4 is the inner diameter of the inlet end of the second flow channel.

[0014] Furthermore, the first flow channel includes at least a connected contraction section and a straight pipe section. From the inlet end of the first flow channel to the outlet end of the first flow channel, the cross-sectional area of ​​the contraction section perpendicular to the extension center axis gradually decreases, and the inner diameter of the straight pipe section is equal to the inner diameter of the outlet end of the contraction section; and a preset plane parallel to the extension center axis intersects with the inner wall of the contraction section arranged around the extension center axis to form a fifth intersection line and a sixth intersection line, and there is an angle A1 between the fifth intersection line and the sixth intersection line.

[0015] Furthermore, the inner diameter D1 of the straight pipe section is greater than or equal to and less than or equal to

[0016] Furthermore, the inner diameter D2 of the inlet end of the contraction section satisfies: D2 = (3-5) D1.

[0017] Furthermore, the angle A1 is configured as follows: 20°≤A1≤25°.

[0018] Furthermore, the contraction section has a length L2 on the extended central axis, and the length L2 is configured as: L2 = (D2-D1) / 2×cot(A1 / 2) mm; wherein D1 is the inner diameter of the outlet end of the contraction section, and D2 is the inner diameter of the inlet end of the contraction section.

[0019] Furthermore, the base includes a rod body and a nozzle cap, which is releasably coupled to the rod body, wherein the first flow channel is formed on the rod body, and the cavity area and the second flow channel are formed on the nozzle cap.

[0020] The technical solution of the present invention is applied, and a fluid power mechanism is used to pressurize and accelerate the cleaning fluid. The fluid output by the fluid source forms a high-speed cleaning fluid under the acceleration of the fluid power mechanism. After the high-speed cleaning fluid flows into the cavity area between the first flow channel and the second flow channel, it can form a self-excited oscillating pulse flow and produce a cavitation effect. At this time, the local pressure of the high-speed cleaning fluid in the cavity area is lower than the critical value of the saturated vapor pressure, which will induce the generation, development and collapse of cavitation bubbles in the fluid. The cavitation bubbles release a large amount of energy at the moment of collapse. At this time, the high-speed cleaning fluid forms turbulent motion in the cavity area and its medium density changes, thereby enhancing the atomization effect to form a cleaning fluid containing fine bubbles. After the cleaning fluid containing fine bubbles is injected into the tooth and gum surface through the second flow channel (that is, after the fine cavitation bubbles enter the atmospheric environment through the second flow channel), the cavitation bubbles will collapse with the change in pressure, instantly releasing a large amount of energy. The instantaneous release of energy can improve the cleaning ability of the teeth. In addition, using the cleaning fluid containing fine bubbles to be injected into the tooth and gum surface can avoid the problem of gum bleeding for users, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] FIG1 shows a schematic structural diagram of an embodiment of an oral care appliance of the present invention;

[0023] FIG2 illustrates a cross-sectional view of one embodiment of the oral care implement of FIG1 ;

[0024] FIG3 shows a partial enlarged view of the oral care implement of FIG2 ;

[0025] FIG4 is a schematic structural diagram of another embodiment of the rod body of the oral care appliance of FIG1 ;

[0026] FIG5 shows a cross-sectional view of the rod body of FIG4 ;

[0027] FIG6 shows a schematic structural diagram of the nozzle cap of the oral care appliance of FIG1 ;

[0028] FIG7 shows a cross-sectional view of the nozzle cap of FIG6; and

[0029] 8 illustrates a partial cross-sectional view of another embodiment of the oral care implement of FIG. 1 .

[0030] The above drawings include the following reference numerals: 01, rod body; 02, nozzle cap; 1, base body; 11, first flow channel; 111, contraction section; 112, straight pipe section; 113, conveying section; 12, second flow channel; 13, cavity area. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] As shown in Figures 1 to 3, an embodiment of the present invention provides an oral care device. The oral care device includes a fluid power mechanism, a delivery structure, and a base 1. The fluid power mechanism is configured to provide power for a fluid outputted by a fluid source; the delivery structure is configured to deliver the fluid; at least a portion of the base 1 is configured to surround and define the delivery structure, and the delivery structure has an extended central axis extending along the length of the base 1; the delivery structure includes a first flow channel 11, a cavity region 13, and a second flow channel 12, which are connected in sequence. The first flow channel 11 is configured to receive the fluid inputted by the fluid power mechanism. The cross-sectional areas of the outlet end of the first flow channel 11 and the inlet end of the second flow channel 12 perpendicular to the extended central axis are both smaller than the areas of any cross-sections of the cavity region 13 perpendicular to the extended central axis, so that the fluid flowing into the cavity region 13 can form a self-excited oscillating pulse flow and generate a cavitation effect. The second flow channel 12 is configured to eject the fluid that generates the cavitation effect.

[0033] In the above technical solution, a fluid power mechanism is used to pressurize and accelerate the clean fluid. The fluid output by the fluid source forms a clean fluid with a higher speed under the acceleration of the fluid power mechanism. After the clean fluid with a higher speed flows into the cavity area 13 between the first flow channel 11 and the second flow channel 12, it can form a self-excited oscillating pulse flow and produce a cavitation effect. At this time, the local pressure of the clean fluid with a higher speed in the cavity area 13 is lower than the critical value of the saturated vapor pressure, which will induce the generation, development and collapse of cavitation bubbles inside the fluid. The cavitation bubbles will release a large amount of energy at the moment of collapse. At this time, the cleaning fluid with a higher speed forms turbulent motion in the cavitation area 13 and its medium density will change, thereby enhancing the atomization effect to form a cleaning fluid containing micro bubbles. After the cleaning fluid containing micro bubbles is injected into the surface of the teeth and gums through the second flow channel 12 (that is, after the micro cavitation bubbles enter the atmospheric environment through the second flow channel 12), the cavitation bubbles will collapse with the change in pressure, and release a large amount of energy instantly. The energy released instantly can improve the cleaning ability of the teeth, and using the cleaning fluid containing micro bubbles to be injected into the surface of the teeth and gums can avoid the problem of bleeding gums for users, thereby improving the user experience.

[0034] Specifically, in an embodiment of the present invention, since the area of ​​any cross-section of the cavity region 13 perpendicular to the extension center axis is larger than the cross-sectional area of ​​the outlet end of the first flow channel 11 and the inlet end of the second flow channel 12 perpendicular to the extension center axis, and since the cleaning fluid with a higher flow rate passes through the narrow nozzle (first flow channel 11), accompanied by complex turbulent motion and changes in medium density, the local pressure in the cleaning fluid is lower than the critical value of the saturated vapor pressure, and cavitation bubbles will be induced inside the cleaning fluid. When the cleaning fluid with cavitation bubbles flows into a relatively large space (cavitation region), the cleaning fluid will slow down and the pressure will increase. At the local high pressure, the cavitation bubbles inside the cleaning fluid will be induced to rupture, and the cavitation bubbles will release a large amount of energy at the moment of collapse. The complete process of the initiation, development and collapse of cavitation bubbles forms the cavitation effect.

[0035] It should be noted that, in the embodiment of the present invention, the cleaning fluid may be cleaning fluid or water.

[0036] It should be noted that, in the embodiment of the present invention, the cavity region 13 is a fluid channel formed on the substrate 1 and used for passing fluid.

[0037] Preferably, in an embodiment of the present invention, the fluid power mechanism is a power pump.

[0038] As shown in Figure 3, in an embodiment of the present invention, the ratio of the length L5 of the cavity area 13 to the inner diameter D is greater than or equal to 0.2 and less than or equal to 0.9; wherein, the distance between the outlet end of the first flow channel 11 and the inlet end of the second flow channel 12 forms the length L5 of the cavity area 13, and the equivalent diameter of the cross section of the cavity area 13 forms the inner diameter D.

[0039] Through the above-mentioned setting, a self-excited oscillation pulse flow can be generated in the cavitation area 13 to form a self-excited oscillation pulse effect, thereby generating discrete vortices and cavitation pockets in the cavitation area 13. The cavitation pockets can produce periodic energy accumulation and release of the incoming flow entering the first flow channel 11, thereby generating pressure fluctuations and a certain cavitation effect, and then forming an aerosol jet with a fine bubble flow and ejected through the second flow channel 12 to clean the user's mouth.

[0040] It should be noted that, in the embodiment of the present invention, the diameter of a circular pipe with the same hydraulic radius is defined as the equivalent diameter of a non-circular pipe.

[0041] It has been found through experiments that when the ratio of the length L5 of the cavity region 13 to the inner diameter D is greater than or equal to 0.2 and less than or equal to 0.9, the cavity region 13 can generate a self-excited oscillating pulse flow.

[0042] It should be noted that in the embodiment of the present invention, if the cross-sectional size of the hole region 13 remains unchanged along the length direction of the hole region 13, the inner diameter D is the equivalent diameter corresponding to any cross-section of the hole region 13; if the cross-sectional size of the hole region 13 changes along the length direction of the hole region 13, the inner diameter D is the equivalent diameter corresponding to the largest cross-section of the hole region 13.

[0043] Specifically, in an embodiment of the present invention, the length L5 of the cavity area 13 is configured as follows: 0.6mm≦L5≦1.2mm. In this way, on the one hand, it can avoid the problem that the distance the jet beam enters the lower nozzle increases due to the cavity area being too long, so that part of the energy cannot be transmitted to the nozzle mouth, the flow rate of the cleaning fluid is reduced, and the cleaning effect is reduced. On the other hand, it can avoid the problem that the cavitation bubbles are not obvious due to the cavity area being too short, and the effective self-excited pulse effect cannot be formed, and the cavitation effect is not good. Therefore, the above-mentioned size can enhance the self-excited oscillation pulse effect, thereby improving the cavitation effect, thereby improving the atomization effect of the fluid, and making the bubbles flowing out through the second flow channel 12 denser, so as to avoid damage to the user's mouth.

[0044] Specifically, in an embodiment of the present invention, the inner diameter D of the cavity region 13 is configured as follows: 1.33 mm ≤ D ≤ 3 mm. This, on the one hand, can avoid the situation where the cavity region is too large, causing some energy to be unable to propagate to the nozzle orifice, thereby reducing the flow rate of the cleaning fluid and thus reducing the cleaning effect. On the other hand, it can avoid the situation where the cavity region is too small, causing the cavitation bubbles to be unclear, unable to form an effective self-excited pulse effect, and the cavitation effect to be poor. Therefore, the above-mentioned size can enhance the self-excited oscillation pulse effect, thereby improving the cavitation effect, thereby improving the atomization effect of the fluid and making the bubbles flowing out of the second flow channel 12 denser, thereby avoiding damage to the user's oral cavity.

[0045] As shown in FIG3 , in an embodiment of the present invention, the cross-sectional area of ​​the inlet end of the second flow channel 12 is greater than or equal to the cross-sectional area of ​​the outlet end of the first flow channel 11 .

[0046] Through the above-mentioned setting, turbulence of the gas-liquid two-phase can be better formed, and a strong cavitation effect can continue to occur in the second flow channel 12, thereby improving the atomization effect and making the bubbles denser, thereby improving the cleaning ability and improving the user experience.

[0047] As shown in FIG3 , in the embodiment of the present invention, along the extension center axis, in the direction from the first flow channel 11 to the second flow channel 12 , the cross section of the cavity region 13 perpendicular to the extension center axis gradually decreases.

[0048] Specifically, in the embodiment of the present invention, the ratio of the inner diameter D4 of the inlet end of the second flow channel 12 to the inner diameter D1 of the outlet end of the first flow channel 11 is greater than or equal to 1 and less than or equal to 1.7.

[0049] Through the above-mentioned arrangement, while generating the cavitation effect, the cleaning fluid in the cavity area 13 can also be accelerated, thereby forming a high-speed jet ejected from the second flow channel 12 to increase the impact force of the jet, thereby further improving the cleaning ability of the cleaning fluid; and accelerating the cleaning fluid in the cavity area 13 can further enhance the mixing of the gas-liquid two phases of the cleaning fluid, thereby improving the atomization effect, making the bubbles denser, and thereby improving the user experience.

[0050] Preferably, in an embodiment of the present invention, the shape of the cavity region 13 is a truncated cone.

[0051] In one embodiment, the cross section of the cavity region 13 perpendicular to the extension center axis may remain unchanged from the first flow channel 11 to the second flow channel 12 . For example, the shape of the cavity region 13 is cylindrical or rectangular.

[0052] In one embodiment, in the direction from the first flow channel 11 to the second flow channel 12 , the cross section of the cavity region 13 perpendicular to the extension center axis may first increase and then decrease. For example, the shape of the cavity region 13 is spherical.

[0053] As shown in Figure 3, in an embodiment of the present invention, the cross-section of the cavity area 13 perpendicular to the extension center axis gradually decreases, and a preset plane parallel to the extension center axis intersects with the inner wall of the cavity area 13 arranged around the extension center axis to form a first intersection line and a second intersection line. There is an angle A4 between the first intersection line and the second intersection line, and the angle A4 is configured as: 110°≤A4≤135°.

[0054] Through the above-mentioned setting, on the one hand, it can be avoided that the angle A4 is too large, which causes part of the energy to be unable to be integrated, and the energy of the cavitation bubble collapse cannot be effectively output, thereby affecting the difficulty in mixing the gas and liquid phases better; on the other hand, it can be avoided that the angle A4 is too small, which causes the space of the cavity area 13 to be smaller, the cavitation bubbles to be not obvious, and the effective self-excited pulse effect cannot be formed, so as to avoid weakening the cavitation effect. Therefore, the above-mentioned angle can enhance the self-excited oscillation pulse effect and increase the flow rate of the cleaning fluid, so that the gas and liquid phases can be better mixed, so as to improve the atomization effect of the fluid, and make the bubbles in the fluid flowing out through the second flow channel 12 denser, thereby increasing the cleaning power to the oral cavity and avoiding damage to the user's oral cavity.

[0055] Preferably, in an embodiment of the present invention, the angle A4 is 120°.

[0056] As shown in FIG. 7 , in the embodiment of the present invention, the cross-sectional area of ​​the second flow channel 12 perpendicular to the extension center axis gradually increases from the inlet end of the second flow channel 12 to the outlet end of the second flow channel 12 .

[0057] Through the above-mentioned setting, the aerosol fluid in the cavity area 13 can be diffused through the second flow channel 12 and then sprayed out, thereby increasing the area covered by the spray to improve the cleaning area. The aerosol fluid carries a fine bubble flow. Compared with ordinary nozzles, the oral care device of this embodiment greatly improves the cleaning efficiency of the oral cavity.

[0058] As shown in Figure 7, in an embodiment of the present invention, in second flow channel 12, a predetermined plane parallel to the central axis of extension intersects with the inner wall of second flow channel 12 disposed around the central axis of extension, forming third and fourth intersection lines. Angle A3 is defined between the third and fourth intersection lines, and angle A3 is configured to be 6° ≤ A3 ≤ 8°. This increases the area covered by the jet, thereby improving the cleaning area; it also prevents an excessively large diffusion angle A3 from reducing the impact force of the jet and thus reducing the cleaning effect.

[0059] Preferably, in an embodiment of the present invention, the angle A3 is 8°.

[0060] It should be noted that, in the embodiment of the present invention, according to the standard flow rate (300ml / min-350ml / min) of the adopted power pump and oral care appliance, it can be calculated that 6°≤A3≤8°.

[0061] As shown in Figure 7, in an embodiment of the present invention, the second flow channel 12 has a length L3 on the extended central axis, and the length L3 is configured as: L3 = (D5-D4) / 2×cot(A3 / 2) mm; wherein D5 is the inner diameter of the outlet end of the second flow channel 12, and D4 is the inner diameter of the inlet end of the second flow channel 12.

[0062] In the above technical solution, the length L3 of the second flow channel 12 is calculated by the inner diameter of the inlet and outlet ends of the second flow channel 12 and the diffusion angle of the second flow channel 12. In this way, the spray coverage area can be increased to ensure cleaning efficiency and cleaning effect.

[0063] Preferably, in an embodiment of the present invention, the length L3 is 2.9 mm.

[0064] As shown in Figures 4 and 5, in an embodiment of the present invention, the first flow channel 11 includes at least a connected contraction section 111 and a straight pipe section 112. From the inlet end of the first flow channel 11 to the outlet end of the first flow channel 11, the cross-sectional area of ​​the contraction section 111 perpendicular to the extension center axis gradually decreases, and the inner diameter of the straight pipe section 112 is equal to the inner diameter of the outlet end of the contraction section 111; and a preset plane parallel to the extension center axis intersects with the inner wall of the contraction section 111 arranged around the extension center axis to form a fifth intersection line and a sixth intersection line, and there is an angle A1 between the fifth intersection line and the sixth intersection line.

[0065] Through the above-mentioned setting, utilizing the Venturi principle, the contraction section 111 of the first flow channel 11 can further accelerate the cleaning fluid, and the flow velocity of the cleaning fluid reaches the maximum in the straight pipe section 112. At the same time, the pressure of the cleaning fluid can be further reduced, so that the local pressure in the cleaning fluid is far lower than the critical value of the saturated vapor pressure, thereby causing cavitation in the cleaning fluid. The clean fluid with cavitation enters the cavitation area 13. When the outlet end cross-section of the first flow channel 11 and the inlet end cross-section of the second flow channel 12 are both smaller than the cross-section of the cavitation area 13, the pressure of the liquid flow containing cavitation bubbles flowing into the cavitation area 13 will increase, thereby inducing the cavitation rupture inside the cleaning fluid to form a cavitation effect. In this way, the effect of the cavitation effect in the cavitation area 13 can be further increased.

[0066] Specifically, in the embodiment of the present invention, the inner diameter D1 of the straight pipe section 112 is greater than or equal to and less than or equal to

[0067] Through the above arrangement, on the one hand, a high flow rate of the cleaning fluid at the outlet end of the contraction section 111 can be ensured; on the other hand, the inner diameter D1 of the straight pipe section 112 can be avoided to be too small, resulting in a small water output, thereby avoiding a reduction in cleaning efficiency.

[0068] Specifically, in the embodiment of the present invention, the first flow channel 11 further includes a conveying section 113 communicating with the contraction section 111 , and the conveying section 113 and the straight pipe section 112 are respectively located at two ends of the contraction section 111 .

[0069] It should be noted that, through the power output of the pump or other fluid power mechanism, the pressurized clean fluid flows into the inlet end of the delivery section 113, and according to the momentum theorem: Ft=mv2-mv1, the cumulative effect of force on time (impulse), its increment is the principle of accumulation of force over time. When the output power of the pump is constant, the impact force of the jet is related to the change in the product of the fluid mass and velocity. To this end, it is necessary to reduce the pressure loss along the pipeline, match the caliber of the fluid inlet with the outlet caliber of the pump, so as to reduce the resistance of the fluid inlet caliber (the inner diameter D3 of the inlet end of the delivery section 113). Therefore, the inner diameter D3 of the inlet end of the delivery section 113 adopts In this way, by using the same pipe diameter as that of the pump or other fluid dynamic mechanism, the fluid resistance along the way can be reduced; and by setting the inner diameter D1 of the straight pipe section 112 to be greater than or equal to and less than or equal to Can increase the impact force of the jet.

[0070] As shown in FIG. 5 , in the embodiment of the present invention, the inner diameter D2 of the inlet end of the contraction section 111 satisfies: D2 = (3-5) D1.

[0071] Through the above-mentioned setting, utilizing the Venturi principle, the cleaning fluid can be further accelerated in the contraction section 111, and at the same time, the pressure can be further reduced, thereby generating a large number of cavitations in the cleaning fluid, and a higher speed cleaning fluid can be formed to enter the cavitation area 13 to produce a cavitation effect, and increase the effect of the cavitation effect in the cavitation area 13.

[0072] It should be noted that since the flow rate of the inner diameter D1 of the straight pipe section 112 is related to the inner diameter of the first flow channel 11, the length of the first flow channel 11 and the bending radius of the first flow channel 11, by calculation, D2 = (3 to 5) or Combined with the manufacturing process, the inner diameter D2 of the inlet end of the contraction section 111 can be taken as

[0073] It should be noted that, according to the standard flow rate of 300 ml / min-350 ml / min of the adopted pump and oral care appliance, it can be calculated that the length L1 ≈ D1 = 0.6 mm to 0.65 mm of the straight pipe section 112 .

[0074] As shown in FIG. 5 , in the embodiment of the present invention, the angle A1 is configured as follows: 20°≤A1≤25°.

[0075] Through the above arrangement, on the one hand, the contraction section 111 can further accelerate the cleaning fluid as much as possible to form a cleaning fluid with a higher speed; on the other hand, it can avoid the angle A1 being too large to reduce the length of the contraction section 111, resulting in a poor acceleration effect.

[0076] Preferably, in the embodiment of the present invention, the angle A1 is 21°.

[0077] It should be noted that the value range of the angle A1 is an empirical value.

[0078] As shown in Figure 5, in an embodiment of the present invention, the contraction section 111 has a length L2 on the extended central axis, and the length L2 is configured as: L2 = (D2-D1) / 2×cot(A1 / 2) mm; wherein D1 is the inner diameter of the outlet end of the contraction section 111, and D2 is the inner diameter of the inlet end of the contraction section 111.

[0079] In the above technical solution, the length L2 of the contraction section 111 is calculated by the inner diameter of the inlet and outlet ends of the contraction section 111 and the contraction angle of the contraction section 111. In this way, the flow resistance can be reduced to ensure an increase in the fluid flow rate.

[0080] Preferably, in an embodiment of the present invention, the length L2 is 4.3 mm.

[0081] As shown in Figures 6 and 7, in an embodiment of the present invention, the base 1 includes a rod body 01 and a nozzle cap 02, and the nozzle cap 02 is releasably coupled to the rod body 01, wherein the first flow channel 11 is formed on the rod body 01, and the cavity area 13 and the second flow channel 12 are formed on the nozzle cap 02.

[0082] The above arrangement facilitates processing of the cavity area 13 , and a cavity area 13 is formed between the rod body 01 and the nozzle cap 02 after they are matched.

[0083] Specifically, in the embodiment of the present invention, the nozzle cap 02 is connected to the rod body 01 through threads.

[0084] Specifically, in the embodiment of the present invention, the angle A4 is configured as: 110°≤A4≤135°, which makes it easier to install the rod body 01 in the nozzle cap 02, so that the rod body 01 and the nozzle cap 02 can be better adapted.

[0085] As shown in FIG3 , in an embodiment of the present invention, one end of the rod body 01 that cooperates with the nozzle cap 02 is cylindrical, and the cavity area is a conical area enclosed between the outer wall of the rod body 01 and the inner wall of the nozzle cap 02 .

[0086] As shown in Figure 8, in one embodiment, the end of the rod body 01 that cooperates with the nozzle cap 02 is provided with a chamfer, so that the cavity area is the area enclosed by the outer wall of the rod body 01 and the inner wall of the nozzle cap 02, that is, the cavity area is composed of the conical area and the annular area between the rod body 01 and the nozzle cap.

[0087] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the clean fluid is pressurized and accelerated by a fluid power mechanism, and the fluid output by the fluid source forms a clean fluid with a higher speed under the acceleration of the fluid power mechanism. After the clean fluid with a higher speed flows into the cavity area between the first flow channel and the second flow channel, it can form a self-excited oscillating pulse flow and produce a cavitation effect. At this time, the local pressure of the clean fluid with a higher speed in the cavity area is lower than the critical value of the saturated vapor pressure, which will induce the generation, development and collapse of cavitation bubbles inside the fluid. The cavitation bubbles will release a large amount of energy at the moment of collapse. At this time, the cleaning fluid with a higher speed forms turbulent motion in the cavitation area and its medium density will change, thereby enhancing the atomization effect to form a cleaning fluid containing micro bubbles. After the cleaning fluid containing micro bubbles is injected into the surface of the teeth and gums through the second flow channel (that is, after the micro cavitation bubbles enter the atmospheric environment through the second flow channel), the cavitation bubbles will collapse with the change in pressure, and release a large amount of energy instantly. The energy released instantly can improve the cleaning ability of the teeth, and using the cleaning fluid containing micro bubbles to be injected into the surface of the teeth and gums can avoid the problem of bleeding gums for users, thereby improving the user experience.

[0088] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An oral care device, characterized in that: include: a fluid power mechanism configured to provide power to the fluid output by the fluid source; A conveying structure configured to convey a fluid; A substrate (1), at least a portion of which is configured to surround and define the conveying structure, the conveying structure having an extended central axis extending along the length direction of the substrate (1); The conveying structure comprises a first flow channel (11), a cavity area (13) and a second flow channel (12) which are connected in sequence, the first flow channel (11) being configured to receive the fluid input by the fluid power mechanism, the cross-sectional areas of the outlet end of the first flow channel (11) and the inlet end of the second flow channel (12) perpendicular to the extension center axis are both smaller than the area of ​​any cross section of the cavity area (13) perpendicular to the extension center axis, so that the fluid flowing into the cavity area (13) can form a self-excited oscillating pulse flow and produce a cavitation effect, and the second flow channel (12) is configured to be used for ejecting the fluid that produces the cavitation effect.

2. The oral care device according to claim 1, characterized in that: The ratio of the length L5 of the cavity region (13) to the inner diameter D is greater than or equal to 0.2 and less than or equal to 0.9; The distance between the outlet end of the first flow channel (11) and the inlet end of the second flow channel (12) forms the length L5 of the cavity area (13), and the equivalent diameter of the cross section of the cavity area (13) forms the inner diameter D.

3. The oral care device according to claim 2, characterized in that: The length L5 of the cavity region (13) is configured to be: 0.6 mm≦L5≦1.2 mm; and / or, The inner diameter D of the cavity region (13) is configured to be: 1.33 mm≦D≦3 mm.

4. The oral care device according to claim 1, characterized in that: The cross-sectional area of ​​the inlet end of the second flow channel (12) is greater than or equal to the cross-sectional area of ​​the outlet end of the first flow channel (11).

5. The oral care device according to claim 1, characterized in that: Along the extension center axis, in the direction from the first flow channel (11) to the second flow channel (12), the cross section of the cavity area (13) perpendicular to the extension center axis gradually decreases or remains unchanged or first increases and then decreases.

6. The oral care device according to claim 5, characterized in that: The cross-section of the cavity area (13) perpendicular to the extension center axis gradually decreases, and a preset plane parallel to the extension center axis intersects with an inner wall of the cavity area (13) arranged around the extension center axis to form a first intersection line and a second intersection line, and an angle A4 is provided between the first intersection line and the second intersection line, and the angle A4 is configured as: 110°≤A4≤135°.

7. The oral care device according to any one of claims 1 to 6, characterized in that: From the inlet end of the second flow channel (12) to the outlet end of the second flow channel (12), the cross-sectional area of ​​the second flow channel (12) perpendicular to the extension central axis gradually increases.

8. The oral care device according to claim 7, characterized in that: In the second flow channel (12), a preset plane parallel to the extension center axis intersects with an inner wall of the second flow channel (12) arranged around the extension center axis to form a third intersection line and a fourth intersection line, and an angle A3 is formed between the third intersection line and the fourth intersection line, and the angle A3 is configured as: 6°≤A3≤8°.

9. The oral care device according to claim 7, characterized in that: The second flow channel (12) has a length L3 on the extension center axis, and the length L3 is configured as: L3 = (D5-D4) / 2×cot(A3 / 2) mm; Wherein, D5 is the inner diameter of the outlet end of the second flow channel (12), and D4 is the inner diameter of the inlet end of the second flow channel (12).

10. The oral care device according to any one of claims 1 to 6, characterized in that: The first flow channel (11) at least comprises a connected contraction section (111) and a straight pipe section (112); from the inlet end of the first flow channel (11) to the outlet end of the first flow channel (11), the cross-sectional area of ​​the contraction section (111) perpendicular to the extension center axis gradually decreases; the inner diameter of the straight pipe section (112) is equal to the inner diameter of the outlet end of the contraction section (111); A preset plane parallel to the extension center axis intersects with an inner wall of the contraction section (111) arranged around the extension center axis to form a fifth intersection line and a sixth intersection line, and an angle A1 is formed between the fifth intersection line and the sixth intersection line.

11. The oral care device according to claim 10, characterized in that: The inner diameter D1 of the straight pipe section (112) is greater than or equal to and less than or equal to 12. The oral care device according to claim 10, characterized in that: The inner diameter D2 of the inlet end of the contraction section (111) satisfies: D2 = (3-5) D1.

13. The oral care device according to claim 10, characterized in that: The angle A1 is configured as: 20°≤A1≤25°.

14. The oral care device according to claim 10, characterized in that: The contraction section (111) has a length L2 on the extension center axis, and the length L2 is configured as: L2 = (D2-D1) / 2×cot(A1 / 2) mm; Wherein, D1 is the inner diameter of the outlet end of the contraction section (111), and D2 is the inner diameter of the inlet end of the contraction section (111).

15. The oral care device according to any one of claims 1 to 6, characterized in that: The base (1) comprises a rod body (01) and a nozzle cap (02), wherein the nozzle cap (02) is releasably coupled to the rod body (01), wherein the first flow channel (11) is formed on the rod body (01), and the cavity area (13) and the second flow channel (12) are formed on the nozzle cap (02).

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