Nozzle and oral cavity cleaning device

Abstract

According to the nozzle and the oral cavity cleaning device, a fluid channel is formed in the nozzle, the fluid channel is provided with a first flow channel, a second flow channel and a third flow channel which are sequentially arranged in a communicating mode in the flowing direction of a fluid medium, and a fluid outlet of the fluid channel is formed in the end, away from the second flow channel, of the third flow channel; the area of the maximum cross section of the first flow channel and the area of the maximum cross section of the third flow channel are both smaller than the area of the minimum cross section of the second flow channel. A cavitation structure is formed in the nozzle by differentially setting the sizes of the flow channels, high-speed water flow generated by the first flow channel can form large-scale vortexes and discrete vortexes in the second flow channel due to self-oscillation, larger pressure pulses can be generated through interaction of the two vortexes, generation of the cavitation effect in the third flow channel is improved, and the cavitation effect in the third flow channel is improved. And more cavitation bubbles are induced to be generated, so that the nozzle can provide water flow carrying rich bubbles, and conditions are created for effectively improving the cleaning effect and the cleaning stability.

Description

Technical Field

[0001] The utility model relates to the field of oral care equipment, in particular to a nozzle and an oral cleaning device. Background Art

[0002] As a common oral cleaning and care device, the working principle of the water flosser is to use pulse impact to eject cleaning fluid from the nozzle of the water flosser, thereby achieving the effect of cleaning teeth and interdental spaces. Traditional water flossers generally have conflicting requirements for cleaning power and comfort. If the cleaning power is too weak, the cleaning effect is not ideal, and if the cleaning power is too strong, it is easy to cause damage to teeth, gums, etc., which seriously affects the popularity of water flossers in daily oral cleaning and care.

[0003] In order to improve cleaning efficiency and provide a softer and more comfortable water flossing experience, cavitation structures have been gradually introduced into the nozzle structure design of water flossers. The current cavitation structures are mainly designed based on the principles of Venturi tube, self-oscillation cavitation, organ pipe, turbulence, shear, gas mixing, ultrasonic waves, etc. With the help of cavitation structures, when the local pressure in the flow channel drops to the critical pressure (generally close to the vaporization pressure), the gas nuclei in the water grow into cavitation bubbles, and the energy generated by the cavitation bubble explosion can effectively remove plaque and other effects. However, the current nozzle design cavitation structure has the problem of difficult to ensure the cleaning effect. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a nozzle and an oral cleaning device using the nozzle.

[0005] According to a first aspect, an embodiment provides a nozzle for an oral cleaning device, wherein a fluid channel for guiding a fluid medium to flow in and out of the nozzle is formed inside the nozzle, the fluid channel having a first flow channel, a second flow channel, and a third flow channel sequentially connected and arranged along a flow direction of the fluid medium, and an end of the third flow channel away from the second flow channel forms a fluid outlet of the fluid channel;

[0006] The area of ​​the maximum cross section of the first flow channel and the area of ​​the maximum cross section of the third flow channel are both smaller than the area of ​​the minimum cross section of the second flow channel.

[0007] In one embodiment, the area of ​​the minimum cross section of the first flow channel is smaller than the area of ​​the minimum cross section of the third flow channel.

[0008] In one embodiment, the ratio of the area of ​​the minimum cross section of the second flow channel to the area of ​​the maximum cross section of the first flow channel is between 2-25;

[0009] and / or the ratio of the area of ​​the minimum cross section of the second flow channel to the area of ​​the maximum cross section of the third flow channel is between 2 and 25;

[0010] And / or a ratio of an area of ​​a minimum cross section of the third flow channel to an area of ​​a maximum cross section of the first flow channel is between 0.8-4.

[0011] In one embodiment, the ratio of the length of the first flow channel to the minimum diameter of the first flow channel is between 2 and 5;

[0012] and / or a ratio of the length of the second flow channel to the minimum diameter of the second flow channel is between 0.5 and 2;

[0013] And / or the ratio of the length of the third flow channel to the minimum diameter of the third flow channel is between 2-5.

[0014] In one embodiment, the areas of any two cross sections of the first flow channel are equal;

[0015] and / or the areas of any two cross sections of the second flow channel are equal;

[0016] And / or the areas of any two cross sections of the third flow channel are equal.

[0017] In one embodiment, the cross-sectional area of ​​the first flow channel gradually increases from an end of the first flow channel away from the second flow channel toward an end close to the second flow channel;

[0018] or

[0019] The first flow channel includes a first sub-flow channel and a second sub-flow channel, and the second sub-flow channel is arranged in communication between the first sub-flow channel and the second flow channel; wherein:

[0020] The areas of any two cross sections of the first sub-channel are equal, and the area of ​​the cross section of the second sub-channel gradually increases from one end of the second sub-channel close to the first sub-channel to one end close to the second channel; or the area of ​​the cross section of the first sub-channel gradually decreases from one end of the first sub-channel away from the second sub-channel to one end close to the second sub-channel, and the area of ​​the cross section of the second sub-channel gradually increases from one end of the second sub-channel close to the first sub-channel to one end close to the second channel.

[0021] In one embodiment, the first flow channel has a first cone angle, and the first cone angle is between 0° and 6°.

[0022] In one embodiment, the cross-sectional area of ​​the third flow channel gradually increases from an end of the third flow channel close to the second flow channel toward an end away from the second flow channel;

[0023] or

[0024] The third flow channel includes a third sub-flow channel and a fourth sub-flow channel, and the third sub-flow channel is arranged between the second flow channel and the fourth sub-flow channel; wherein, the areas of any two cross sections of the third sub-flow channel are equal, and the area of ​​the cross section of the fourth sub-flow channel gradually increases from an end of the fourth sub-flow channel close to the third sub-flow channel toward an end away from the third sub-flow channel.

[0025] In one embodiment, the third flow channel has a third cone angle, and the third cone angle is between 0° and 20°.

[0026] In one embodiment, at least a portion of the third flow channel extends into the second flow channel to form a protrusion in the second flow channel; a preset gap is provided between a peripheral wall of the protrusion and a flow channel wall of the second flow channel.

[0027] In one embodiment, the cross-sectional area of ​​the protrusion gradually increases along the flow direction of the fluid medium until the outer peripheral wall of the protrusion is connected to the flow channel wall of the second flow channel.

[0028] In one embodiment, the protrusion has a second cone angle, and the second cone angle is between 60° and 150°; and / or a smooth transition is arranged between the outer peripheral wall of the protrusion and the flow channel wall of the second flow channel.

[0029] In one embodiment, the minimum diameter of the first flow channel is between 0.55 mm and 0.7 mm.

[0030] In one embodiment, the fluid channel further has a fourth flow channel, and the fourth flow channel is connected to the end of the first flow channel away from the second flow channel, and the end of the fourth flow channel away from the first flow channel forms a fluid inlet of the fluid channel; the area of ​​the minimum cross-section of the fourth flow channel is greater than the area of ​​the maximum cross-section of the second flow channel.

[0031] In one embodiment, the sum of the lengths of the first flow channel, the second flow channel, the third flow channel and the fourth flow channel is between 80 mm and 100 mm; wherein the length of the third flow channel is smaller than the length of the fourth flow channel, and the length of the third flow channel is greater than the length of the first flow channel and the length of the second flow channel.

[0032] In one embodiment, the sum of the lengths of the second flow channel and the third flow channel does not exceed 20 mm; and / or the length ratio of the third flow channel to the second flow channel is between 1.1-1.5.

[0033] In one embodiment, the fourth flow channel is connected to the first flow channel in a smooth transition.

[0034] In one embodiment, it includes a nozzle and a nozzle, the nozzle is fixedly connected to the nozzle, the first flow channel is formed inside the nozzle, and the second flow channel and the third flow channel are formed inside the nozzle.

[0035] In one embodiment, the nozzle has a sleeve portion and a flow channel portion sequentially arranged along the flow direction of the fluid medium, and the nozzle has an extension portion; wherein:

[0036] The second flow channel and the third flow channel are formed inside the flow channel portion, the sleeve portion is sleeved and fixed to the periphery of the protruding portion, and the fluid outlet of the first flow channel is arranged at the protruding portion.

[0037] In one embodiment, the extending portion has a step structure, and the step structure is arranged outside the extending portion around the first flow channel; the step structure is used to abut the sleeve portion to limit the relative position between the sleeve portion and the extending portion.

[0038] In one embodiment, the cross-sectional area of ​​the flow channel portion gradually decreases from an end of the flow channel portion close to the sleeve portion toward an end away from the sleeve portion, and / or the nozzle is a soft rubber nozzle.

[0039] According to the second aspect, an embodiment provides an oral cleaning device, comprising a pump body and the nozzle, wherein the nozzle is connected to the pump body.

[0040] According to the nozzle of the above embodiment, a fluid channel is formed inside the nozzle, and the fluid channel has a first channel, a second channel and a third channel which are sequentially connected and arranged along the flow direction of the fluid medium, and the end of the third channel away from the second channel forms a fluid outlet of the fluid channel; the area of ​​the maximum cross section of the first channel and the area of ​​the maximum cross section of the third channel are both smaller than the area of ​​the minimum cross section of the second channel. By differentially setting the size of each channel, a cavitation structure is formed inside the nozzle, and the high-speed water flow generated by the first channel can form large-scale vortices and discrete vortices in the second channel due to self-excited oscillation. The interaction of the two vortices can generate a larger pressure pulse, increase the generation of the cavitation effect in the third channel, and induce the generation of more cavitation bubbles, so that the nozzle can provide a water flow carrying abundant bubbles, thereby creating conditions for effectively improving the cleaning effect and cleaning stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the structural decomposition of a nozzle according to an embodiment.

[0042] Figure 2 FIG1 is a schematic diagram of the cross-sectional structure of a nozzle according to an embodiment (I).

[0043] Figure 3 This is a schematic diagram of the cross-sectional structure of a nozzle according to an embodiment (II).

[0044] Figure 4 FIG1 is a schematic diagram of the cross-sectional structure of a nozzle according to an embodiment (I).

[0045] Figure 5 This is a schematic diagram of the cross-sectional structure of a nozzle according to an embodiment (II).

[0046] Figure 6 The figure is a schematic diagram of the cross-sectional structure of the extending portion of the nozzle according to an embodiment.

[0047] Figure 7 The figure is a schematic diagram of the cross-sectional structure of a nozzle in a nozzle of an embodiment.

[0048] Figure 8 A schematic diagram of the cavitation principle of a nozzle according to an embodiment.

[0049] Fig. 9 Schematic diagram of the reference structure of an oral cleaning device according to an embodiment.

[0050] In the figure:

[0051] a, first flow channel; a1, first sub-flow channel; a2, second sub-flow channel; b, second flow channel; c, third flow channel; c1, protrusion; d, fourth flow channel;

[0052] 10. Nozzle; 11. Nozzle; 11a. Socket portion; 11b. Flow channel portion; 12. Nozzle; 12a. Insertion portion; 12b. Step structure; 20. Machine body. DETAILED DESCRIPTION

[0053] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0054] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0055] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0056] See also Figures 1 to 9 , an embodiment of the present application provides an oral cleaning device, such as a water flosser; the device includes a nozzle 10, a body 20, and other functional components that exist as needed; wherein the nozzle 10 is arranged on the body 20 in a detachable or non-detachable manner, and a fluid channel for guiding the flow of a fluid medium into and out of the nozzle 10 is formed inside the nozzle 10, that is, the fluid channel should have a fluid inlet and a fluid outlet; a liquid storage portion (such as a water tank) for storing a cleaning medium (such as a liquid fluid medium such as physiological saline, medical agents, etc.) and a pump body (not shown in the figure) are provided in the body 20, and the pump body is connected and arranged between the nozzle 10 and the liquid storage portion.

[0057] When the pump body is working, the fluid medium stored in the liquid storage part can be pumped to the fluid inlet of the nozzle 10, and then flow along the fluid channel of the nozzle 10 to the fluid outlet of the nozzle 10, and finally sprayed out from the fluid outlet of the nozzle 10 to clean the user's oral cavity (such as teeth, tooth gaps, etc.). In specific implementation, the pulses provided by the pump body (such as 1200 pulses / min) can be used to enable the fluid medium to clean the oral cavity in a pulse impact manner.

[0058] The body 20 and other functional components in the oral cleaning device can refer to the prior art, and the nozzle 10 and its related structures are mainly introduced below.

[0059] See also Figure 1 and Fig. 9 The nozzle 10 includes a nozzle 11 and a nozzle pipe 12; wherein the nozzle 11 is fixedly connected to one end of the nozzle pipe 10, and is mainly used to align with or extend into the oral cavity so as to spray the fluid medium into the oral cavity with the help of the nozzle 11; the end of the nozzle pipe 12 away from the nozzle 11 is used to connect with the body 20 (specifically connected with the pump body) so that the body 20 can pump the fluid medium into the nozzle 10.

[0060] Figures 2 to 4, the nozzle 12 is formed with a fourth flow channel d and a first flow channel a which are coaxially connected in sequence, and the nozzle 11 is formed with a second flow channel b and a third flow channel c which are coaxially connected in sequence; after the nozzle 11 is fixedly connected to the nozzle 12, the fourth flow channel d, the first flow channel a, the second flow channel b and the third flow channel c are coaxially connected and arranged in sequence, thereby forming a fluid channel of the nozzle 10; wherein, the end of the fourth flow channel d away from the first flow channel a forms a fluid inlet, and it can be understood that the port of the nozzle 12 away from the nozzle 11 (or the corresponding end of the fourth flow channel d) is the fluid inlet of the fluid channel; the port of the nozzle 11 away from the nozzle 12 (or the corresponding end of the third flow channel c) is the fluid outlet of the fluid channel. That is, the fourth flow channel d, the first flow channel a, the second flow channel b and the third flow channel c are connected and arranged in sequence along the flow direction of the fluid medium (i.e.: the direction in which the fluid matrix enters from the fluid inlet and flows toward the fluid outlet).

[0061] Among them, the area of ​​the maximum cross section of the first flow channel a and the area of ​​the maximum cross section of the third flow channel c are both set to be smaller than the area of ​​the minimum cross section of the second flow channel b, and the area of ​​the minimum cross section of the fourth flow channel d is set to be larger than the area of ​​the maximum cross section of the second flow channel b.

[0062] It should be noted that the "cross section" can be understood as the cross section formed by cutting the flow channel along a plane (which can be defined as a cutting plane) perpendicular to the axial line of the fluid channel of the nozzle; the contour shape of the cross section of each channel can be a circle or a regular polygon such as a rectangle.

[0063] See also Figure 8 By setting the size of each flow channel differently, and taking advantage of the structural characteristics that the cross-section of the first flow channel a and the cross-section of the third flow channel c are both smaller than the cross-section of the second flow channel d, a cavitation structure similar to the Holm Hertz resonance can be formed inside the nozzle 10. According to the Holm Hertz resonance principle, when the fluid medium driven by the body 20 (specifically the pump body) flows through the first flow channel a through the fourth flow channel d, a higher flow velocity will be generated, and the high-speed jet will enter the second flow channel b with a larger volume space, thereby generating a discrete vortex T1. The discrete vortex T1 will generate an unstable disturbance shear layer with the fluid medium in the second flow channel b, and there will be many vortex disturbances of different frequency bands, and it will move downstream (that is, toward the third flow channel c) in the form of a vortex ring with the mainstream high-speed jet.

[0064] At the same time, the discrete vortex T1 will also be oscillated and amplified in the second flow channel b to produce a large-scale vortex T2, thereby forming cavitation bubbles symmetrically distributed about the axis of the second flow channel b. The energy of these cavitation bubbles will gradually concentrate on the main frequency band, resulting in periodic convergence and release, so that the mainstream high-speed jet will further produce larger pulses, so that the high-speed jet has pressure fluctuations and a certain cavitation effect, increasing the generation of cavitation effect in the third flow channel c and inducing the generation of more cavitation bubbles. After the water flow carrying rich cavitation bubbles is ejected from the fluid outlet, the energy generated by the cavitation bubble explosion can be used to effectively clean the oral cavity (such as plaque on teeth).

[0065] In addition, since there are both discrete vortex T1 and large-scale vortex T2 in the second flow channel b, the interaction between these two vortices will also generate a series of pressure disturbances and feedback to the upstream (i.e., the direction of the first flow channel c), thereby inducing new vortex pulsation in the upstream separation zone, and ultimately increasing the cavitation effect in the third flow channel c.

[0066] As for the oral cleaning device, in addition to the pulses provided by the pump body, additional pulses can be added with the help of the cavitation structure formed by the first flow channel a, the second flow channel b and the third flow channel c in the nozzle 10, so as to realize the superposition of cavitation effect and pulse frequency, thereby achieving the effect of taking into account both cleaning efficiency and comfort.

[0067] It should be noted that Figure 8 The solid line with an arrow in the middle represents the fluid medium and its flow direction or the mainstream high-speed jet. Figure 8 The dot-dash line in represents the axis line of the second flow channel b or the fluid channel.

[0068] In specific implementation, the ratio of the area of ​​the minimum cross section of the second flow channel b to the area of ​​the maximum cross section of the first flow channel a can be set between 2-25; thereby, the cavitation degree or cavitation effect of the fluid medium can be ensured, and the outer dimensions of the nozzle 10 corresponding to the second channel b (i.e., the nozzle 11) can be prevented from being fully inserted into the oral cavity due to the excessively large cross-sectional area of ​​the second flow channel b. Based on the same principle and requirements, the ratio of the area of ​​the minimum cross section of the second flow channel b to the area of ​​the maximum cross section of the third flow channel c can also be set between 2-25.

[0069] In specific implementation, the ratio of the area of ​​the minimum cross section of the third flow channel c to the area of ​​the maximum cross section of the first flow channel c can be set between 0.8 and 4; thereby, the cavitation degree or cavitation effect of the fluid medium can be guaranteed, and the excessive resistance of the nozzle 10 caused by the small cross section area of ​​the first flow channel c can be avoided. Of course, in some embodiments, the area of ​​the minimum cross section of the first flow channel a can be set to be smaller than the area of ​​the minimum cross section of the third flow channel c, so that the first flow channel a has the smallest cross section in the fluid channel of the nozzle 10, thereby creating favorable conditions for enhancing the cavitation effect.

[0070] In other embodiments, the fourth flow channel d may also be omitted. For example, a port at one end of the first flow channel a away from the second flow channel b may be used as or form a fluid inlet 10b of the fluid channel, and a channel structure similar to the fourth flow channel d may be configured on the body 20 (specifically, the pump body); thus, by installing the nozzle 10 on the body 20, the body 20 may also be used to pump the fluid to the first flow channel a and generate a higher flow rate, and finally a high-speed jet enters the second flow channel b.

[0071] In one embodiment, see Figure 3 , Figure 4 , Figure 5 and Figure 7 At least a portion of the third flow channel c extends into the second flow channel b, so that a protrusion c1 can be formed in the second flow channel b; the protrusion c1 can be understood as a structural part that surrounds the fluid inlet of the third flow channel c, and there is a preset gap between the protrusion c1 and the flow channel wall of the second flow channel b; wherein the flow channel wall of the second flow channel b can be understood as a structural wall (i.e., the inner circumferential wall of a local part of the nozzle 11) that is surrounded by the fluid channel or the axis of the second flow channel b to form the second flow channel b.

[0072] Thus, the protrusion c1 can play the role of a "collision wall" at the end of the second flow channel b away from the first flow channel a, which is conducive to forming a disturbance vortex at the fluid inlet of the third flow channel c, thereby providing structural support for enhancing the cavitation effect. In specific implementation, the cross-sectional area of ​​the protrusion c1 can be set to gradually increase along the flow direction of the fluid medium until the outer peripheral wall of the protrusion c1 is connected to the flow channel wall of the second flow channel b; and the cone angle of the protrusion c1 (which can be defined as the second cone angle β) can be controlled between 60°-150° (see Figure 7 ); thereby, the formed disturbance vortex can be expanded along the outer peripheral wall of the protrusion c1 toward the mainstream high-speed jet (ie, the middle main frequency band), thereby effectively enhancing the cavitation effect.

[0073] In some embodiments, the protrusion c1 and the flow channel wall of the second flow channel b are smoothly transitioned, for example, a chamfer is provided between the outer peripheral wall of the protrusion c1 and the flow channel wall of the second flow channel b (for example, Figure 2The local enlarged structure shown in the A area in the figure); thereby, it is possible to avoid the formation of a water flow dead zone due to the existence of a sharp angle between the protrusion c1 and the second flow channel b, which causes the loss of flow kinetic energy.

[0074] In one embodiment, see Figure 4 and Figure 5 The first flow channel a adopts a tapered channel structure in which the cross-sectional area gradually increases along the flow direction of the fluid medium, that is, the cross-sectional area of ​​the first flow channel a gradually increases from the end of the first flow channel a close to the fourth flow channel d (or away from the second flow channel b) to the end close to the second flow channel b; the second flow channel b adopts a columnar channel structure with a constant cross-sectional area, that is, the areas of any two cross sections of the second flow channel b are equal; the third flow channel c adopts a tapered channel structure similar to the first flow channel a, that is, the cross-sectional area of ​​the third flow channel c gradually increases from the end of the third flow channel c close to the second flow channel b to the end away from the second flow channel b; correspondingly, the fourth flow channel d adopts a columnar channel structure with a constant cross-sectional area.

[0075] In specific implementation, the ratio of the length of the first flow channel a to the minimum diameter of the first flow channel a can be controlled between 2-5, for example, the minimum diameter of the first flow channel a is between 0.55mm-0.7mm; at the same time, the cone angle of the first flow channel a can be defined as a first cone angle α, and the first cone angle α can be controlled between 0°-6°; by selecting the dimensional parameters such as the length, minimum diameter and cone angle of the first flow channel a, it is possible to effectively avoid the increase in resistance caused by the first flow channel a being too long, thereby affecting the cleaning power. At the same time, the fourth flow channel d can smoothly transition to the first flow channel a, that is, the chamfer can be set at the flow channel wall of the fourth flow channel d close to one end of the first flow channel a (specifically, Figure 2 and Figure 4 The structure shown in the B area in the figure) allows the fourth flow channel d to be connected to the first flow channel a in a smooth transition; thereby avoiding energy loss caused by turbulence at the junction or transition position between the first flow channel a and the fourth flow channel d.

[0076] Based on the same principle and requirements, the ratio of the length of the third flow channel c to the minimum diameter of the third flow channel c can be controlled between 2-5, and the cone angle of the third flow channel c (ie, the third cone angle γ) can be controlled between 0°-20° (see Figure 7 ).

[0077] In one embodiment, see Figure 3The first flow channel a includes a first sub-flow channel a1 and a second sub-flow channel a2 which are sequentially connected and arranged along the flow direction of the fluid medium, that is, the second sub-flow channel a2 is connected and arranged between the first sub-flow channel a1 and the second flow channel b; wherein, the first sub-flow channel a1 may also adopt a variable diameter channel structure, that is: the cross-sectional area of ​​the first sub-flow channel a1 gradually decreases from the end close to the fourth flow channel d (or away from the second sub-flow channel a2) to the end close to the second sub-flow channel a2; the cross-sectional area of ​​the second sub-flow channel a2 gradually increases from the end of the second sub-flow channel a2 close to the first sub-flow channel a1 to the end close to the second sub-flow channel b.

[0078] It can be understood that, viewed from the flow direction of the fluid medium, the cross-sectional area of ​​the first flow channel a presents a structural form that first gradually decreases and then gradually increases, and the minimum cross-sectional area of ​​the first flow channel a is located at the junction of the first sub-flow channel a1 and the second sub-flow channel a2.

[0079] For some examples, see Figure 2 , the first sub-channel a1 may also adopt an equal-diameter channel structure, that is, the areas of any two cross sections of the first sub-channel a1 are equal, while the cross-sectional area of ​​the second sub-channel a2 gradually increases from the end of the second sub-channel a2 close to the first sub-channel a1 to the end close to the second sub-channel b; thereby, the cross-sectional area of ​​the entire first channel a presents a structural form that first remains unchanged and then gradually increases. At this time, the minimum cross-sectional area of ​​the first channel a is at the junction of the first sub-channel a1 and the second sub-channel a2.

[0080] In a specific implementation, the channel wall of the first sub-channel a1 smoothly transitions to the channel wall of the second sub-channel a2 (or the fluid inlet of the second sub-channel a2), for example, a chamfer is provided at the channel wall of the first sub-channel a1 near one end of the second sub-channel a2 (specifically, Figure 2 Thus, it is possible to avoid increasing energy loss due to turbulence at the junction or transition point between the two.

[0081] In other embodiments, the first flow channel a may also adopt a channel structure with equal diameter, that is, the areas of any two cross sections of the first flow channel a are equal.

[0082] It should be noted that, in order to avoid the increase of resistance due to the excessive length of the first flow channel a, in different embodiments, the ratio of the length of the first flow channel a to the minimum diameter of the first flow channel a can follow a proportional relationship of 2-5, and in the embodiment in which the first flow channel a has a taper angle, the first taper angle α can be controlled to be 0°-6° (see Figure 6 ).

[0083] In some embodiments, the third flow channel c can be selected and set with reference to the structural morphology of the first flow channel a. For example, the third flow channel c adopts an equal-diameter channel structure in which the areas of any two cross sections are equal. For another example, the third flow channel c includes a third sub-flow channel and a fourth sub-flow channel arranged in sequence. The third sub-flow channel is connected and arranged between the second flow channel b and the fourth sub-flow channel, the areas of any two cross sections of the third sub-flow channel are equal, and the cross-sectional area of ​​the fourth sub-flow channel gradually increases from the end close to the third sub-flow channel to the end away from the third sub-flow channel.

[0084] It should be noted that, according to actual design requirements, the first flow channel a, the second flow channel b and the third flow channel c can adopt different channel structures, so as to be combined and connected to form corresponding fluid channels; for example, all three adopt a cylindrical channel structure with a constant cross-sectional area or diameter; for example, the second flow channel b and the third flow channel c can adopt a conical channel structure with a gradually increasing diameter or cross-sectional area, or a channel structure with a constant diameter or cross-sectional area and then gradually increasing; the key point is that the area of ​​the maximum cross section of the first flow channel a and the area of ​​the maximum cross section of the third flow channel c are smaller than the area of ​​the minimum cross section of the second flow channel b; all these will not be elaborated here.

[0085] In one embodiment, see Figure 1 , Figure 6 and Figure 7 The nozzle 11 has a sleeve portion 11a and a flow channel portion 11b, and the sleeve portion 11a and the flow channel portion 11b are arranged in sequence along the flow direction of the fluid medium; correspondingly, the nozzle 12 has an insertion portion 12a; wherein the second flow channel b and the third flow channel c are formed inside the flow channel portion 11b, and the fluid outlet of the first flow channel a is arranged at the insertion portion 12a. The sleeve portion 11a can be sleeved and fixed on the periphery of the insertion portion 12a by bonding, screwing, sleeved, welding, etc., so as to form the nozzle 10 in combination, and form a fluid channel inside the nozzle 10.

[0086] By setting the nozzle 11 and the nozzle 12 as a split structure, on the one hand, by forming corresponding flow channels in the nozzle 11 and the nozzle 12, the complete nozzle 10 can be easily and quickly assembled and a cavitation structure can be formed inside the nozzle 10; on the other hand, the complexity and stability of the cavitation structure can be reduced, providing a guarantee for improving the cleaning effect. In specific implementation, the nozzle 11 can use a soft rubber nozzle (such as edible silicone), which can not only utilize the flexibility of the soft rubber nozzle, but also protect the teeth, gums, etc. from being bruised or punctured when the nozzle 11 contacts the teeth, gums, etc., and will not be corroded by saliva or produce toxic substances.

[0087] In other embodiments, the nozzle 11 and the nozzle 12 may also adopt an integrated structure, that is, the nozzle 10 is an integrated structure to meet different design or application requirements; it will not be elaborated here.

[0088] In one embodiment, see Figure 1 and Figure 6 The insertion portion 12a has a step structure 12b, and the step structure 12b is arranged on the outside of the insertion portion 12a around the axis of the first flow channel a or the axis of the fluid channel. On the one hand, the step structure 12b can be used to abut the end surface of the sleeve portion 11b, which can limit the relative position between the sleeve portion 11b and the insertion portion 12a, thereby achieving the purpose of limiting the relative position between the first flow channel a and the second flow channel b, and improving the stability of the structural connection between the nozzle 11 and the nozzle 12. On the other hand, the step structure 12b can create conditions for the coaxial connection of the first flow channel a, the second flow channel b and the third flow channel c, reducing the deformation of the fluid channel caused by the local bending of the nozzle 10 and affecting the cavitation effect.

[0089] In specific implementation, the step structure 12b can be set to multiple levels, for example, two levels; the two-level step structure 12b is arranged in layers in the flow direction of the fluid medium; accordingly, the sleeve portion 11b is provided with a step surface that is aligned with the corresponding step structure 12b. In this way, structural support can be further provided to improve the stability of the connection between the nozzle 11 and the nozzle 12.

[0090] In one embodiment, see Figure 7 The sleeve portion 11a is set to a structural form in which the areas of any two cross sections are equal, and the cross-sectional area of ​​the flow channel portion 11b is set to gradually decrease from the end of the flow channel portion 11b close to the sleeve portion 11a to the end away from the sleeve portion 11a; thereby, the outer contour of the flow channel portion 11b presents a frustum-shaped columnar shape compared with the sleeve portion 11a or other parts of the nozzle 10, which can make it easier for the nozzle 11 to be inserted into the oral cavity, and can also avoid the nozzle 11 being too thick to be difficult to locate the part to be cleaned (such as the teeth) or to produce a foreign body sensation in the oral cavity.

[0091] In one embodiment, the total length of the fourth flow channel d, the first flow channel a, the second flow channel b and the third flow channel c can be controlled between 80mm-100mm, which can also be understood as the overall length of the nozzle 10 can be controlled between 80mm-100mm; wherein, the length of the third flow channel c is set to be less than the length of the fourth flow channel d, and the length of the third flow channel c is greater than the length of the first flow channel a and the length of the second flow channel b; in specific implementation, the total length of the second flow channel b and the third flow channel c can be controlled to not exceed 20mm, and the length ratio of the third flow channel c to the second flow channel b can be controlled between 1.1-1.5.

[0092] Thus, by controlling the overall length of the nozzle 10, the nozzle 10 can be adapted to the existing body 10 to meet actual usage requirements. By controlling the length and ratio of the second flow channel b and the third flow channel c, it is convenient to perform bending processing in the nozzle 11 to form the second flow channel b and the third flow channel c, and the portion of the nozzle 10 that is used to extend into the oral cavity can be more consistent with or adapted to the physiological structure or size inside the oral cavity.

[0093] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. A nozzle, characterized in that: For an oral cleaning device, the nozzle has a fluid channel formed inside for guiding the fluid medium to flow in and out of the nozzle, the fluid channel has a first flow channel, a second flow channel and a third flow channel which are sequentially connected and arranged along the flow direction of the fluid medium, and an end of the third flow channel away from the second flow channel forms a fluid outlet of the fluid channel; The area of ​​the maximum cross section of the first flow channel and the area of ​​the maximum cross section of the third flow channel are both smaller than the area of ​​the minimum cross section of the second flow channel.

2. The nozzle according to claim 1, characterized in that The area of ​​the minimum cross section of the first flow channel is smaller than the area of ​​the minimum cross section of the third flow channel.

3. The nozzle according to claim 1, characterized in that The ratio of the area of ​​the minimum cross section of the second flow channel to the area of ​​the maximum cross section of the first flow channel is between 2 and 25; and / or the ratio of the area of ​​the minimum cross section of the second flow channel to the area of ​​the maximum cross section of the third flow channel is between 2 and 25; And / or a ratio of an area of ​​a minimum cross section of the third flow channel to an area of ​​a maximum cross section of the first flow channel is between 0.8-4.

4. The nozzle according to claim 1, characterized in that The ratio of the length of the first flow channel to the minimum diameter of the first flow channel is between 2 and 5; and / or a ratio of the length of the second flow channel to the minimum diameter of the second flow channel is between 0.5 and 2; And / or the ratio of the length of the third flow channel to the minimum diameter of the third flow channel is between 2-5.

5. The nozzle according to claim 1, characterized in that The areas of any two cross sections of the first flow channel are equal; and / or the areas of any two cross sections of the second flow channel are equal; And / or the areas of any two cross sections of the third flow channel are equal.

6. The nozzle according to claim 1, characterized in that The cross-sectional area of ​​the first flow channel gradually increases from an end of the first flow channel away from the second flow channel toward an end close to the second flow channel; or The first flow channel includes a first sub-flow channel and a second sub-flow channel, and the second sub-flow channel is arranged in communication between the first sub-flow channel and the second flow channel; wherein: The areas of any two cross sections of the first sub-channel are equal, and the area of ​​the cross section of the second sub-channel gradually increases from one end of the second sub-channel close to the first sub-channel to one end close to the second channel; or the area of ​​the cross section of the first sub-channel gradually decreases from one end of the first sub-channel away from the second sub-channel to one end close to the second sub-channel, and the area of ​​the cross section of the second sub-channel gradually increases from one end of the second sub-channel close to the first sub-channel to one end close to the second channel.

7. The nozzle according to claim 6, characterized in that The first flow channel has a first cone angle, and the first cone angle is between 0° and 6°.

8. The nozzle according to claim 1, characterized in that The cross-sectional area of ​​the third flow channel gradually increases from an end of the third flow channel close to the second flow channel toward an end of the third flow channel far from the second flow channel; or The third flow channel includes a third sub-flow channel and a fourth sub-flow channel, and the third sub-flow channel is arranged between the second flow channel and the fourth sub-flow channel; wherein, the areas of any two cross sections of the third sub-flow channel are equal, and the area of ​​the cross section of the fourth sub-flow channel gradually increases from an end of the fourth sub-flow channel close to the third sub-flow channel toward an end away from the third sub-flow channel.

9. The nozzle according to claim 8, characterized in that The third flow channel has a third cone angle, and the third cone angle is between 0° and 20°.

10. The nozzle according to claim 1, characterized in that At least a portion of the third flow channel extends into the second flow channel to form a protrusion in the second flow channel; a preset gap is provided between the peripheral wall of the protrusion and the flow channel wall of the second flow channel.

11. The nozzle according to claim 10, characterized in that The cross-sectional area of ​​the protrusion gradually increases along the flow direction of the fluid medium until the outer peripheral wall of the protrusion is connected to the flow channel wall of the second flow channel.

12. The nozzle according to claim 11, characterized in that The protrusion has a second cone angle, which is between 60° and 150°; and / or a smooth transition is arranged between the outer peripheral wall of the protrusion and the flow channel wall of the second flow channel.

13. The nozzle according to claim 1, characterized in that The minimum diameter of the first flow channel is between 0.55 mm and 0.7 mm.

14. The nozzle according to claim 1, characterized in that The fluid channel also has a fourth channel, which is connected to the end of the first channel away from the second channel, and the end of the fourth channel away from the first channel forms a fluid inlet of the fluid channel; the area of ​​the minimum cross-section of the fourth channel is greater than the area of ​​the maximum cross-section of the second channel.

15. The nozzle according to claim 14, characterized in that The sum of the lengths of the first flow channel, the second flow channel, the third flow channel and the fourth flow channel is between 80 mm and 100 mm; wherein the length of the third flow channel is smaller than the length of the fourth flow channel, and the length of the third flow channel is greater than the length of the first flow channel and the length of the second flow channel.

16. The nozzle according to claim 15, characterized in that The sum of the lengths of the second flow channel and the third flow channel does not exceed 20 mm; and / or the ratio of the length of the third flow channel to the second flow channel is between 1.1-1.

5.

17. The nozzle according to claim 15, characterized in that The fourth flow channel is connected to the first flow channel in a smooth transition manner.

18. The nozzle according to any one of claims 1 to 17, characterized in that The invention comprises a nozzle and a nozzle, wherein the nozzle is fixedly connected to the nozzle, the first flow channel is formed inside the nozzle, and the second flow channel and the third flow channel are formed inside the nozzle.

19. The nozzle according to claim 18, characterized in that The nozzle has a sleeve portion and a flow channel portion sequentially arranged along the flow direction of the fluid medium, and the nozzle has an extension portion; wherein: The second flow channel and the third flow channel are formed inside the flow channel portion, the sleeve portion is sleeved and fixed to the periphery of the protruding portion, and the fluid outlet of the first flow channel is arranged at the protruding portion.

20. The nozzle of claim 19, wherein: The extending portion has a step structure, and the step structure is arranged outside the extending portion around the first flow channel; the step structure is used to abut against the sleeve portion to limit the relative position between the sleeve portion and the extending portion.

21. The nozzle of claim 19, wherein: The cross-sectional area of ​​the flow channel portion gradually decreases from an end of the flow channel portion close to the sleeve portion toward an end away from the sleeve portion, and / or the nozzle is a soft rubber nozzle.

22. An oral cleaning device, characterized in that: It comprises a pump body and a nozzle as described in any one of claims 1 to 21, wherein the nozzle is connected to the pump body.

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