A shear type cavitation nozzle for an oral irrigator, its use and a shear cavitation oral irrigator

Abstract

The application provides a shearing cavitation nozzle and its application and a shearing cavitation oral irrigator. The shearing cavitation nozzle comprises a main body 2 and a shearing piece 3. The main body 2 has a cavitation cavity inside. Two ends of the main body 2 are respectively provided with a water inlet 21 and a water outlet 22 which are communicated with the cavitation cavity. The shearing piece 3 is arranged in the cavitation cavity and is provided with an inner flow channel 303 and an outer flow channel 302. The water inlet ends of the inner flow channel 303 and the outer flow channel 302 correspond to the water inlet 21. The water outlet ends of the inner flow channel 303 and the outer flow channel 302 correspond to the water outlet 22. The shearing piece 3 reciprocates to shear the cavitation water flow under the pressure of the pulsed water flow of the water inlet 21.

Description

Technical Field

[0001] This invention relates to the field of liquid nozzles, and more particularly to a shearing cavitation nozzle for a dental flosser, its application, and a shearing cavitation dental flosser. Background Technology

[0002] Most commercially available oral irrigators use pulsed water flow. To achieve higher cleaning efficiency and a gentler rinsing experience, cavitation structures have gradually been incorporated into their designs. Cavitation here refers to the process by which water nuclei grow into bubbles when the local pressure in the flow channel drops to a critical pressure (generally close to the vaporization pressure). The accumulation, flow, splitting, and collapse of these bubbles are collectively referred to as the overall process. The energy generated by the bursting of cavitation bubbles can effectively remove plaque.

[0003] Current cavitation structures are mainly based on Venturi tubes (which use a combination of contraction and expansion to change the inner diameter of the tube, causing changes in internal hydraulic pressure; when the liquid flows through the contraction section and the pressure is lower than the saturated vapor pressure, bubbles will precipitate; when they move to the expansion section, they will be crushed due to the increased hydraulic pressure), self-oscillating cavitation (mainly the Helmholtz nozzle), organ pipes, turbulence, shearing, gas mixing, and ultrasound. Among these, shearing cavitation mainly targets liquid-liquid and liquid-air interactions.

[0004] Existing cavitation structure designs still have some shortcomings, such as the need for multiple pipelines to supply gas, liquid, or different liquid flows, which places high demands on manufacturing. Summary of the Invention

[0005] One objective of this invention is to provide a nozzle that cavitates water flow to improve the cleaning ability of water flow;

[0006] A second objective of this invention is to provide a dental flosser that, in conjunction with a cavitation nozzle, enhances the ability to remove plaque from teeth in the oral cavity.

[0007] A third objective of this invention is to provide a widely applicable nozzle to improve the cleaning capabilities of cleaning equipment.

[0008] To achieve one objective, this invention provides a shear-type cavitation nozzle, characterized by comprising a main body and a shearing component; the main body has a cavitation cavity inside, and both ends of the main body are respectively provided with an inlet and an outlet communicating with the cavitation cavity; the shearing component is disposed within the cavitation cavity and is provided with an inner flow channel and an outer flow channel, the inlet ends of the inner flow channel and the outer flow channel corresponding to the inlet, and the outlet ends of the inner flow channel and the outer flow channel corresponding to the outlet; the shearing component reciprocates within the cavitation cavity driven by the pulsed water flow at the inlet.

[0009] Preferably, it also includes an elastic reset member, which is disposed between the shearing member and the main body. The shearing member, subjected to the water flow pressure from the inlet, reciprocates in conjunction with the elastic reset member to shear the cavitation water flow.

[0010] Preferably, the internal flow channel is defined as a through hole provided in the shearing member.

[0011] Preferably, the outer flow channel is defined as the water flow space between the shear member and the body.

[0012] Preferably, the outer wall of the shearing member is provided with a guide groove, and the outer flow channel is defined as the guide groove.

[0013] Preferably, the guide channel is a guide channel arranged along the water flow direction, or a guide channel spirally arranged on the outer wall of the shearing member.

[0014] Preferably, when the guide groove is arranged along the water flow direction, the depth of the guide groove gradually increases from the middle to both ends.

[0015] Preferably, the diameter of the shearing element gradually decreases from the middle to both ends.

[0016] Preferably, the through hole is a variable diameter through hole, and the diameter of the variable diameter through hole gradually decreases from the water inlet end to the water outlet end.

[0017] Preferably, the outer flow channel is also provided with an exchange port that communicates with the inner flow channel.

[0018] Preferably, the elastic reset element is a spring, which is disposed between the shearing element and the water outlet of the main body; the maximum elastic potential energy of the spring in the compressed state is greater than the maximum kinetic energy of the water flow on the shearing element.

[0019] Preferably, the elastic reset element is a spring, one end of which is fixed to the shearing element and the other end is fixed to the main body near the water inlet; the maximum elastic potential energy of the spring in the stretched state is greater than the maximum kinetic energy of the water flow on the shearing element.

[0020] The above technical solutions, individually or in combination, exhibit the following beneficial effects:

[0021] The shearing component divides the water flow in the cavitation cavity into at least two streams, one internal and one external, through the inner and outer flow channels. This creates a velocity difference between the two streams. In fluid mechanics, fluid "shearing" can be understood as solid "friction." The fluid can be viewed as a series of superimposed layers. Under uniform velocity conditions, the interaction between layers is weak, which can be understood as weak shearing. However, when a velocity difference exists, the shearing effect between layers is strengthened. Therefore, the water flow with a velocity difference impacts and shears near the outlet of the cavitation cavity downstream of the shearing component, creating cavitation through liquid-liquid interaction. This impact and shearing process cavitates the air in the water flow, generating bubbles.

[0022] When the inlet is a pulsed water flow, during one pulse spray cycle, the shearing component is pushed outward when water is supplied through the inlet. After one pulse cycle ends, some water flows back inside the main body, causing the shearing component to reset. During the next pulse spray, the shearing component is pushed outward again when water is supplied through the inlet. This cycle repeats, causing the end face of the shearing component to form a solid-liquid impact and compression with the water flow, thus enabling it to reciprocate and shear the water flow.

[0023] When a fluid with very low viscosity (such as water or air) comes into contact with an object and has relative motion at a high Reynolds number, the velocity of the thin fluid layer near the object's surface decreases due to viscous shear stress. The fluid adhering to the object's surface has a relative velocity of zero. From the object's surface upwards, the dimensions of each layer gradually increase until they are equal to the free flow velocity. Prandtl proposed that the flow around a solid can be divided into two regions: a very thin layer near the object (the boundary layer) and the region outside that layer. Therefore, shear behavior also occurs between the layers outside the very thin layer near the shear point.

[0024] The shearing component, through the elastic reset component, moves back and forth within the cavitation cavity in conjunction with the impact of the water flow, further assisting the water flow within the cavitation cavity in solid-liquid impact (on the upper and lower end faces of the shearing component) and shearing (on the peripheral wall surface of the shearing component) cavitation; through secondary (re-)shearing, the overall water flow cavitation effect is improved, forming a large number of bubbles and enhancing the water flow cleaning effect.

[0025] The shearing component has an exchange hole connecting the outer flow channel and the inner flow channel, so that the outer layer of water flow outside the shearing component is drawn in by the negative pressure generated by the high-speed water flow inside the shearing component, and shearing cavitation is performed in advance. After shearing, the water flow enters the downstream of the cavitation chamber near the outlet and undergoes liquid-liquid secondary (re-) shearing cavitation, which improves the shearing cavitation effect.

[0026] To achieve these two objectives, the present invention provides a shear cavitation type oral irrigator, characterized in that it includes an oral irrigator body and a shear cavitation nozzle; the shear cavitation nozzle is installed on the water outlet pipe of the oral irrigator body.

[0027] The beneficial effects of adopting the above technical solutions are as follows:

[0028] Installing a shear-type cavitation nozzle on the water outlet pipe of the oral irrigator body allows the water flow of the oral irrigator to create a cavitation effect, generating a large number of bubbles, thereby better removing dental plaque and cleaning the oral cavity.

[0029] To achieve its three objectives, this invention introduces the application of shear-type cavitation nozzles in cleaning equipment. The invention is characterized by installing the shear-type cavitation nozzles on the spray pipes of the cleaning equipment, which includes, but is not limited to, car wash equipment and atomizing equipment.

[0030] The beneficial effects of adopting the above technical solutions are as follows:

[0031] Taking car wash equipment as an example, after installing shear-type cavitation nozzles, when spraying water and cleaning foam on the car body, the shearing action of the liquid can generate foam better, making the foam richer and more conducive to cleaning the car; similarly, atomizing equipment can make the atomization more uniform and the atomization effect better by shearing the liquid through the nozzle. Attached Figure Description

[0032] Figure 1 A schematic diagram illustrating the structure of the shear-type cavitation nozzle of the present invention is shown.

[0033] Figure 2 It expresses Figure 2 Cross-sectional view of AA.

[0034] Figure 3 It expresses Figure 2 Enlarged view of the middle section.

[0035] Figure 4 This diagram illustrates the structure of the spindle-shaped shearing element in a shear-type cavitation nozzle.

[0036] Figure 5 This diagram illustrates another positional view of the spring and shear element of the present invention.

[0037] Figure 6 An explosion diagram illustrating the shear-type cavitation nozzle of the present invention is shown.

[0038] Figure 7 This diagram illustrates one structural feature of the shearing component in this invention.

[0039] Figure 8 This is a front view illustrating another structural aspect of the shearing component in this invention.

[0040] Figure 9 It expresses Figure 8 Three-dimensional view of the shearing component.

[0041] in:

[0042] main body 2 Inlet 21 water outlet 22 Shearing parts 3 Swirl center body 3a Communication port 301 Outflow channel 302 swirl tank 302a Internal flow channel 303 Elastic reset element 4 Detailed Implementation

[0043] The preferred embodiments described below are merely examples, and other obvious variations will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0044] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0045] Example 1:

[0046] Please see Figures 1-9 This embodiment provides a shearing cavitation nozzle, which mainly includes a body 2 and a shearing component 3. The body 2 is the main structure of the nozzle, and it has a cavitation cavity inside. The cavitation cavity is connected to the inlet 21 and the outlet 22 of the body 2. The water flow undergoes shearing cavitation in the cavitation cavity of the body 2. The two ends of the body 2 are provided with an inlet 21 and an outlet 22. The inlet 21 is generally connected to an external water outlet pipe 1, and the cavitation water flow is ejected through the outlet 22.

[0047] Specifically, the shearing element 3 is located within the cavitation cavity and has an inner flow channel 303 and an outer flow channel 302. The water inlet ends of the inner flow channel 303 and the outer flow channel 302 correspond to the water inlet 21, and the water outlet ends of the inner flow channel 303 and the outer flow channel 302 correspond to the water outlet 22. The shearing element 3 reciprocates within the cavitation cavity driven by the pulsed water flow from the water inlet 21. When the water inlet is in a pulsed water flow, the shearing element 3 is pushed outward during one pulse spray cycle when water is supplied from the water inlet 21. After one pulse cycle ends, some water flows back into the main body 2, causing the shearing element 3 to reset. During the next pulse spray, the shearing element 3 is pushed outward again when water is supplied from the water inlet. This cycle repeats, causing the end face of the shearing element 3 to form a solid-liquid impact and compression with the water flow, thereby enabling it to reciprocate and shear the water flow.

[0048] Furthermore, it also includes an elastic reset member 4, which is located between the shear member 3 and the main body 2. After the shear member 3 is subjected to the water flow pressure from the inlet 21, it works in conjunction with the elastic reset member 4 to reciprocate and shear the cavitation water flow.

[0049] The elastic reset component 4 is explained as a structural component that can be reset by elastic potential energy. Specifically, it includes reset after being stretched and reset after being compressed. Here, "reset" is not defined as restoring the elastic reset component 4 to its perfect state when it is not under force, but rather having the ability to reset after being stretched or compressed.

[0050] In this embodiment, the elastic reset member 4 is implemented as a spring, but if there are other equivalent replacement structural members, they should also be included within the intended protection scope of the elastic reset member 4.

[0051] When the elastic reset element 4 in the embodiment is a spring, its installation method is as follows:

[0052] I. Please refer to Figure 2 , Figure 3 and combined Figure 6 The spring is located between the shear member 3 and the outlet 22 of the main body 2. When the water flow from the inlet 21 pushes the shear member 3, the spring is located between the shear member 3 and the outlet 22 and is gradually compressed. The elastic potential energy stored in the spring gradually increases. When the maximum elastic potential energy of the spring in the compressed state is greater than the maximum kinetic energy of the water flow on the shear member 3, the elastic potential energy is released and pushes the shear member 3 back. The elastic potential energy gradually decreases. When it is less than the pushing force of the water flow on the shear member 3, it is compressed again. This process repeats, forming the reciprocating shearing effect of the shear member 3 in the cavitation cavity.

[0053] II. Please refer to Figure 5 The spring is located between the shear member 3 and the inlet 21 of the main body 2. The difference is that one end of the spring is fixed to the shear member 3, and the other end is fixed to the side of the main body 2 near the inlet 21. When the water flow at the inlet 21 pushes the shear member 3, the spring, connected between the shear member 3 and the inlet 21, is gradually stretched. The elastic potential energy stored in the spring gradually increases. When the maximum elastic potential energy of the spring in the stretched state is greater than the maximum kinetic energy of the water flow on the shear member 3, the elastic potential energy is released, the spring contracts, and the shear member 3 is pulled back. The elastic potential energy gradually decreases, and when it is less than the pushing force of the water flow on the shear member 3, it is stretched again. This process repeats, creating the reciprocating shearing effect of the shear member 3 on the water flow in the cavitation cavity.

[0054] In this embodiment, the water flow space between the outer side of the shear member 3 and the inner wall of the main body 2 forms an outer flow channel 302, and a portion of the water flow from the inlet 21 of the main body 2 reaches the outlet 22 after passing through the outer flow channel 302; at least one through hole is provided inside the shear member 3, which forms an inner flow channel 303 of the shear member 3.

[0055] To facilitate better diversion of the water flow from inlet 21 into the outer flow channel 302 and the inner flow channel 303, and to facilitate the impact of the water flow on the shear member 3, thereby pushing the shear member 3, the diameter of the hole at the end of the shear member 3 near the inlet 21 of the main body 2 can be smaller than the diameter of the inlet 21. Therefore, when a large amount of water enters through inlet 21, some water enters the through hole, and some water impacts the shear member 3, pushing it open. As a result, some water also flows into the outer flow channel 302 through the space between the shear member 3 and the inlet 21.

[0056] When water flows into the cavitation cavity through the inlet 21, it is split into the inner flow channel 303 and the outer flow channel 302. The inner flow channel 303 is a through hole, and the water flows directly in without being affected by the flow velocity. However, when it enters the outer flow channel 302, the flow velocity is slowed down due to the structure of the shearing element 3 itself. Therefore, the two water flows merge at the outlet 22 with different flow velocities, thereby achieving the liquid-liquid shearing effect. The reciprocating motion of the shearing element 3 also achieves the solid-liquid shearing effect.

[0057] It should be noted that this embodiment does not impose structural restrictions on the water flow space between the outside and the inner wall of the main body 2, nor does it impose restrictions on the number of through holes inside the shearing member 3.

[0058] In a preferred embodiment of this invention, the outer wall of the shear member 3 is provided with a guide groove, and the outer flow channel 302 is defined as the guide groove. In this embodiment, the guide groove is provided in two ways:

[0059] 1. A guide groove is provided along the water flow direction. The outer flow channel 302 is defined as this guide groove, which can play a role in guiding the water flow. Specifically, there are two ways to form the guide groove: one is to form a groove structure by recessing the outer wall of the shearing part 3; the other is to design a plate-like protrusion to form a groove structure. These two are just to introduce the formation methods of the guide groove. The actual mold making should be selected according to actual needs.

[0060] II. Please combine Figure 4 , Figure 8 and Figure 9 A guide groove is spirally provided along the outer wall of the shearing member 3, adding another implementation method. The shearing member 3 is made into a spindle shape, and the spiral groove on the outer wall forms a swirling groove 302a (the outer flow channel 302 is defined as this swirling groove 302a). When the fluid passes through, it will drive the swirling center body (at this time, the shearing member 3) to move and rotate, increasing the shearing effect. For further details, please refer to [link to relevant documentation]. Figure 9 The swirling center body 3a (which acts as a shear element at this point) is implemented in a spindle shape, with its middle section outer diameter greater than that of both ends (at least greater than the outer diameter of the end that first contacts the fluid). Based on the principle of the Venturi tube, the change in pipe diameter causes a change in the internal pressure of the pipe. The decrease in fluid pressure in the middle section of the swirling center body 3a also facilitates cavitation. For further details, please refer to... Figure 7 To facilitate the shearing effect of shearing component 3, it is spindle-shaped, with its diameter gradually decreasing from the middle to both ends, while the depth of the guide groove gradually increases from the middle to both ends. The shearing cavitation effect is further improved by varying the space between the outer diameter of shearing component 3 and the inner wall of the cavitation cavity.

[0061] In a preferred embodiment of this invention, the shear member 3 has one internal through-hole. Preferably, this through-hole is a variable-diameter through-hole, the diameter of which gradually decreases from the inlet end to the outlet end. Therefore, the variable-diameter through-hole has a larger diameter upstream and a smaller diameter downstream, making it easier for the shear member 3 to be moved by the water flow.

[0062] Furthermore, to further enhance the water flow shear cavitation effect of the outer flow channel 302 and the inner flow channel 303, an exchange port 301 communicating with the inner flow channel 303 is provided at the outer flow channel 302. This exchange port 301 allows for pre-mixing and shearing between the inner and outer liquid layers, increasing the bubble content and causing bubbles to split into smaller, denser bubbles during secondary shearing downstream of the cavitation chamber. Preferably, the number of exchange ports 301 can be one or more. When the outer flow channel 302 is a guide channel, the number of exchange ports 301 is consistent with the number of guide channels and is correspondingly located within the guide channels.

[0063] The beneficial effects of this embodiment are:

[0064] The shearing element 3 divides the water flow in the cavitation cavity into at least two streams, inner and outer, through the inner flow channel 303 and the outer flow channel 302, so that the two streams of water flow in the inner and outer channels of the shearing element 3 form a velocity difference. In fluid mechanics, the "shearing" of a fluid can be understood as the "friction" of a solid. The fluid can be regarded as a superposition of layers. Under the state of uniform velocity, the interaction between layers is very weak, that is, the shearing effect is weak. When there is a velocity difference, the shearing effect between layers will be strengthened. Therefore, the water flow with a velocity difference impacts and shears near the outlet of the cavitation cavity at the downstream position of the shearing element, forming cavitation between liquid and liquid. The air in the water flow is cavitated by water flow through impact and shearing to generate bubbles.

[0065] When the inlet is a pulsed water flow, during one pulse spray cycle, the shearing member 3 is pushed outward when water is supplied through the inlet. After one pulse cycle ends, some water flows back inside the main body, causing the shearing member 3 to reset. During the next pulse spray, the shearing member 3 is pushed outward again when water is supplied through the inlet. This cycle repeats, causing the end face of the shearing member 3 to form a solid-liquid impact and compression with the water flow, thus enabling it to reciprocate to shear the water flow.

[0066] When a fluid with very low viscosity (such as water or air) comes into contact with an object and has relative motion at a high Reynolds number, the velocity of the thin fluid layer near the object surface decreases due to viscous shear stress; the fluid adhering to the object surface has a relative velocity of zero; from the object surface upwards, the dimensions of each layer gradually increase until they are equal to the free flow velocity. Prandtl proposed that the flow around a solid can be divided into two regions: a very thin layer near the object (boundary layer) and the region outside this layer. Therefore, shearing behavior also occurs between the layers outside the very thin layer near shear member 3.

[0067] The shearing component 3, through the elastic reset component 4, moves back and forth within the cavitation cavity in conjunction with the impact of the water flow, further assisting the water flow within the cavitation cavity in solid-liquid impact (upper and lower end faces of the shearing component) and shearing (peripheral wall surface of the shearing component) cavitation; through secondary shearing, the overall water flow cavitation effect is improved, forming a large number of bubbles and enhancing the water flow cleaning effect.

[0068] The shearing component 3 has an exchange hole 301 that connects the outer flow channel 302 and the inner flow channel 303. This allows the outer layer of water flow outside the shearing component 3 to be drawn in by the negative pressure generated by the high-speed water flow inside the shearing component 3, thus performing shearing cavitation in advance. The sheared water flow then enters the downstream of the cavitation chamber near the outlet and undergoes secondary liquid-liquid shearing cavitation, thereby improving the shearing cavitation effect.

[0069] The overall structure is simple and easy to install, and the cavitation effect is good. Unlike the cavitation methods on the market that have additional air intake channels, it generates bubbles by shearing the small amount of air carried in the water flow.

[0070] Example 2:

[0071] This embodiment provides a shear cavitation type oral irrigator, comprising an oral irrigator body and a shear cavitation nozzle, wherein the shear cavitation nozzle is installed on the water outlet pipe 1 of the oral irrigator body. It should be noted that the oral irrigator body can be any existing technology or commercially available oral irrigator, only requiring the nozzle to be replaced with a shear cavitation nozzle.

[0072] The nozzle mainly includes a main body 2 and a shearing component 3. The main body 2 is the main structure of the nozzle, and it has a cavitation cavity inside. The cavitation cavity is connected to the inlet 21 and the outlet 22 of the main body 2. The water flow is sheared and cavitated in the cavitation cavity of the main body 2. The two ends of the main body 2 are provided with an inlet 21 and an outlet 22. The inlet 21 is generally connected to the external water outlet pipe 1, and the cavitated water flow is sprayed out through the outlet 22.

[0073] Specifically, the shearing element 3 is located within the cavitation cavity and has an inner flow channel 303 and an outer flow channel 302. The water inlet ends of the inner flow channel 303 and the outer flow channel 302 correspond to the water inlet 21, and the water outlet ends of the inner flow channel 303 and the outer flow channel 302 correspond to the water outlet 22. The shearing element 3 reciprocates within the cavitation cavity driven by the pulsed water flow from the water inlet 21. When the water inlet is in a pulsed water flow, the shearing element 3 is pushed outward during one pulse spray cycle when water is supplied from the water inlet 21. After one pulse cycle ends, some water flows back into the main body 2, causing the shearing element 3 to reset. During the next pulse spray, the shearing element 3 is pushed outward again when water is supplied from the water inlet. This cycle repeats, causing the end face of the shearing element 3 to form a solid-liquid impact and compression with the water flow, thereby enabling it to reciprocate and shear the water flow.

[0074] Furthermore, it also includes an elastic reset member 4, which is located between the shear member 3 and the main body 2. After the shear member 3 is subjected to the water flow pressure from the inlet 21, it works in conjunction with the elastic reset member 4 to reciprocate and shear the cavitation water flow.

[0075] The elastic reset component 4 is explained as a structural component that can be reset by elastic potential energy. Specifically, it includes reset after being stretched and reset after being compressed. Here, "reset" is not defined as restoring the elastic reset component 4 to its perfect state when it is not under force, but rather having the ability to reset after being stretched or compressed.

[0076] In this embodiment, the elastic reset member 4 is implemented as a spring, but if there are other equivalent replacement structural members, they should also be included within the intended protection scope of the elastic reset member 4.

[0077] When the elastic reset element 4 in the embodiment is a spring, its installation method is as follows:

[0078] I. Please refer to Figure 2 , Figure 3 and combined Figure 6 The spring is located between the shear member 3 and the outlet 22 of the main body 2. When the water flow from the inlet 21 pushes the shear member 3, the spring is located between the shear member 3 and the outlet 22 and is gradually compressed. The elastic potential energy stored in the spring gradually increases. When the maximum elastic potential energy of the spring in the compressed state is greater than the maximum kinetic energy of the water flow on the shear member 3, the elastic potential energy is released and pushes the shear member 3 back. The elastic potential energy gradually decreases. When it is less than the pushing force of the water flow on the shear member 3, it is compressed again. This process repeats, forming the reciprocating shearing effect of the shear member 3 in the cavitation cavity.

[0079] II. Please refer to Figure 5 The spring is located between the shear member 3 and the inlet 21 of the main body 2. The difference is that one end of the spring is fixed to the shear member 3, and the other end is fixed to the side of the main body 2 near the inlet 21. When the water flow at the inlet 21 pushes the shear member 3, the spring, connected between the shear member 3 and the inlet 21, is gradually stretched. The elastic potential energy stored in the spring gradually increases. When the maximum elastic potential energy of the spring in the stretched state is greater than the maximum kinetic energy of the water flow on the shear member 3, the elastic potential energy is released, the spring contracts, and the shear member 3 is pulled back. The elastic potential energy gradually decreases, and when it is less than the pushing force of the water flow on the shear member 3, it is stretched again. This process repeats, creating the reciprocating shearing effect of the shear member 3 on the water flow in the cavitation cavity.

[0080] In this embodiment, the water flow space between the outer side of the shear member 3 and the inner wall of the main body 2 forms an outer flow channel 302, and a portion of the water flow from the inlet 21 of the main body 2 reaches the outlet 22 after passing through the outer flow channel 302; at least one through hole is provided inside the shear member 3, which forms an inner flow channel 303 of the shear member 3.

[0081] To facilitate better diversion of the water flow from inlet 21 into the outer flow channel 302 and the inner flow channel 303, and to facilitate the impact of the water flow on the shear member 3, thereby pushing the shear member 3, the diameter of the hole at the end of the shear member 3 near the inlet 21 of the main body 2 can be smaller than the diameter of the inlet 21. Therefore, when a large amount of water enters through inlet 21, some water enters the through hole, and some water impacts the shear member 3, pushing it open. As a result, some water also flows into the outer flow channel 302 through the space between the shear member 3 and the inlet 21.

[0082] When water flows into the cavitation cavity through the inlet 21, it is split into the inner flow channel 303 and the outer flow channel 302. The inner flow channel 303 is a through hole, and the water flows directly in without being affected by the flow velocity. However, when it enters the outer flow channel 302, the flow velocity is slowed down due to the structure of the shearing element 3 itself. Therefore, the two water flows merge at the outlet 22 with different flow velocities, thereby achieving the liquid-liquid shearing effect. The reciprocating motion of the shearing element 3 also achieves the solid-liquid shearing effect.

[0083] It should be noted that this embodiment does not impose structural restrictions on the water flow space between the outside and the inner wall of the main body 2, nor does it impose restrictions on the number of through holes inside the shearing member 3.

[0084] In a preferred embodiment of this invention, the outer wall of the shear member 3 is provided with a guide groove, and the outer flow channel 302 is defined as the guide groove. In this embodiment, the guide groove is provided in two ways:

[0085] 1. A guide groove is provided along the water flow direction. The outer flow channel 302 is defined as this guide groove, which can play a role in guiding the water flow. Specifically, there are two ways to form the guide groove: one is to form a groove structure by recessing the outer wall of the shearing part 3; the other is to design a plate-like protrusion to form a groove structure. These two are just to introduce the formation methods of the guide groove. The actual mold making should be selected according to actual needs.

[0086] II. Please combine Figure 4 , Figure 8 and Figure 9 A guide groove is spirally provided along the outer wall of the shearing member 3, adding another implementation method. The shearing member 3 is made into a spindle shape, and the spiral groove on the outer wall forms a swirling groove 302a (the outer flow channel 302 is defined as this swirling groove 302a). When the fluid passes through, it will drive the swirling center body (at this time, the shearing member 3) to move and rotate, increasing the shearing effect. For further details, please refer to [link to relevant documentation]. Figure 9 The swirling center body 3a (which is a shearing element at this time) is implemented as a spindle shape, with the outer diameter of its middle section being greater than that of both ends (at least greater than the outer diameter of the end that first contacts the fluid). Based on the principle of the Venturi tube, the change in pipe diameter will cause a change in the internal pressure of the pipe. The decrease in fluid pressure in the middle section of the swirling center body 3a is also conducive to the occurrence of cavitation.

[0087] For further details, please refer to Figure 7 To facilitate the shearing effect of shearing component 3, it is spindle-shaped, with its diameter gradually decreasing from the middle to both ends, while the depth of the guide groove gradually increases from the middle to both ends. The shearing cavitation effect is further improved by varying the space between the outer diameter of shearing component 3 and the inner wall of the cavitation cavity.

[0088] In a preferred embodiment of this invention, the shear member 3 has one internal through-hole. Preferably, this through-hole is a variable-diameter through-hole, the diameter of which gradually decreases from the inlet end to the outlet end. Therefore, the variable-diameter through-hole has a larger diameter upstream and a smaller diameter downstream, making it easier for the shear member 3 to be moved by the water flow.

[0089] Furthermore, to further enhance the water flow shear cavitation effect of the outer flow channel 302 and the inner flow channel 303, an exchange port 301 communicating with the inner flow channel 303 is provided at the outer flow channel 302. This exchange port 301 allows for pre-mixing and shearing between the inner and outer liquid layers, increasing the bubble content and causing bubbles to split into smaller, denser bubbles during secondary shearing downstream of the cavitation chamber. Preferably, the number of exchange ports 301 can be one or more. When the outer flow channel 302 is a guide channel, the number of exchange ports 301 is consistent with the number of guide channels and is correspondingly located within the guide channels.

[0090] The beneficial effects of this embodiment are:

[0091] The shearing element 3 divides the water flow in the cavitation cavity into at least two streams, inner and outer, through the inner flow channel 303 and the outer flow channel 302, so that the two streams of water flow in the inner and outer channels of the shearing element 3 form a velocity difference. In fluid mechanics, the "shearing" of a fluid can be understood as the "friction" of a solid. The fluid can be regarded as a superposition of layers. Under the state of uniform velocity, the interaction between layers is very weak, that is, the shearing effect is weak. When there is a velocity difference, the shearing effect between layers will be strengthened. Therefore, the water flow with a velocity difference impacts and shears near the outlet of the cavitation cavity at the downstream position of the shearing element, forming cavitation between liquid and liquid. The air in the water flow is cavitated by water flow through impact and shearing to generate bubbles.

[0092] When the inlet is a pulsed water flow, during one pulse spray cycle, the shearing member 3 is pushed outward when water is supplied through the inlet. After one pulse cycle ends, some water flows back inside the main body, causing the shearing member 3 to reset. During the next pulse spray, the shearing member 3 is pushed outward again when water is supplied through the inlet. This cycle repeats, causing the end face of the shearing member 3 to form a solid-liquid impact and compression with the water flow, thus enabling it to reciprocate to shear the water flow.

[0093] When a fluid with very low viscosity (such as water or air) comes into contact with an object and has relative motion at a high Reynolds number, the velocity of the thin fluid layer near the object surface decreases due to viscous shear stress; the fluid adhering to the object surface has a relative velocity of zero; from the object surface upwards, the dimensions of each layer gradually increase until they are equal to the free flow velocity. Prandtl proposed that the flow around a solid can be divided into two regions: a very thin layer near the object (boundary layer) and the region outside this layer. Therefore, shearing behavior also occurs between the layers outside the very thin layer near shear member 3.

[0094] The shearing component 3, through the elastic reset component 4, moves back and forth within the cavitation cavity in conjunction with the impact of the water flow, further assisting the water flow within the cavitation cavity in solid-liquid impact (upper and lower end faces of the shearing component) and shearing (peripheral wall surface of the shearing component) cavitation; through secondary shearing, the overall water flow cavitation effect is improved, forming a large number of bubbles and enhancing the water flow cleaning effect.

[0095] The shearing component 3 has an exchange hole 301 that connects the outer flow channel 302 and the inner flow channel 303. This allows the outer layer of water flow outside the shearing component 3 to be drawn in by the negative pressure generated by the high-speed water flow inside the shearing component 3, thus performing shearing cavitation in advance. The sheared water flow then enters the downstream of the cavitation chamber near the outlet and undergoes secondary liquid-liquid shearing cavitation, thereby improving the shearing cavitation effect.

[0096] The overall structure is simple and easy to install, and the cavitation effect is good. Unlike the cavitation methods on the market that have additional air intake channels, it generates bubbles by shearing the small amount of air carried in the water flow.

[0097] Example 3:

[0098] This embodiment is an application-oriented embodiment, combined with... Figures 1-9 It mainly describes the application of shear cavitation nozzles in cleaning equipment, wherein the shear cavitation nozzles are installed in the spray pipeline of the cleaning equipment, including but not limited to car wash equipment and atomizing equipment.

[0099] The shearing cavitation nozzle mainly includes a main body 2 and a shearing component 3. The main body 2 is the main body structure of the nozzle, and it has a cavitation cavity inside. The cavitation cavity is connected to the water inlet 21 and the water outlet 22 of the main body 2. The water flow undergoes shearing cavitation in the cavitation cavity of the main body 2. The two ends of the main body 2 are provided with water inlet 21 and water outlet 22. The water inlet 21 can be connected to the spray pipe of the cleaning equipment, and the cavitation liquid is sprayed out through the water outlet 22.

[0100] Specifically, the shearing element 3 is located within the cavitation cavity and has an inner flow channel 303 and an outer flow channel 302. The water inlet ends of the inner flow channel 303 and the outer flow channel 302 correspond to the water inlet 21, and the water outlet ends of the inner flow channel 303 and the outer flow channel 302 correspond to the water outlet 22. The shearing element 3 reciprocates within the cavitation cavity driven by the pulsed water flow from the water inlet 21. When the water inlet is in a pulsed water flow, the shearing element 3 is pushed outward during one pulse spray cycle when water is supplied from the water inlet 21. After one pulse cycle ends, some water flows back into the main body 2, causing the shearing element 3 to reset. During the next pulse spray, the shearing element 3 is pushed outward again when water is supplied from the water inlet. This cycle repeats, causing the end face of the shearing element 3 to form a solid-liquid impact and compression with the water flow, thereby enabling it to reciprocate and shear the water flow.

[0101] Furthermore, it also includes an elastic reset member 4, which is located between the shear member 3 and the main body 2. After being subjected to the liquid pressure of the inlet 21, the shear member 3 cooperates with the elastic reset member 4 to reciprocate and shear the water flow.

[0102] The elastic reset component 4 is explained as a structural component that can be reset by elastic potential energy. Specifically, it includes reset after being stretched and reset after being compressed. Here, "reset" is not defined as restoring the elastic reset component 4 to its perfect state when it is not under force, but rather having the ability to reset after being stretched or compressed.

[0103] In this embodiment, the elastic reset member 4 is implemented as a spring, but if there are other equivalent replacement structural members, they should also be included within the intended protection scope of the elastic reset member 4.

[0104] The following liquid is interpreted as water flow, but it can also be a mixture of water and additives, such as water and cleaning solution.

[0105] When the elastic reset element 4 in the embodiment is a spring, its installation method is as follows:

[0106] I. Please refer to Figure 2 , Figure 3 and combined Figure 6 The spring is located between the shear member 3 and the outlet 22 of the main body 2. When the water flow from the inlet 21 pushes the shear member 3, the spring is located between the shear member 3 and the outlet 22 and is gradually compressed. The elastic potential energy stored in the spring gradually increases. When the maximum elastic potential energy of the spring in the compressed state is greater than the maximum kinetic energy of the water flow on the shear member 3, the elastic potential energy is released and pushes the shear member 3 back. The elastic potential energy gradually decreases. When it is less than the pushing force of the water flow on the shear member 3, it is compressed again. This process repeats, forming the reciprocating shearing effect of the shear member 3 in the cavitation cavity.

[0107] II. Please refer to Figure 5The spring is located between the shear member 3 and the inlet 21 of the main body 2. The difference is that one end of the spring is fixed to the shear member 3, and the other end is fixed to the side of the main body 2 near the inlet 21. When the water flow at the inlet 21 pushes the shear member 3, the spring, connected between the shear member 3 and the inlet 21, is gradually stretched. The elastic potential energy stored in the spring gradually increases. When the maximum elastic potential energy of the spring in the stretched state is greater than the maximum kinetic energy of the water flow on the shear member 3, the elastic potential energy is released, the spring contracts, and the shear member 3 is pulled back. The elastic potential energy gradually decreases, and when it is less than the pushing force of the water flow on the shear member 3, it is stretched again. This process repeats, creating the reciprocating shearing effect of the shear member 3 on the water flow in the cavitation cavity.

[0108] In this embodiment, the water flow space between the outer side of the shear member 3 and the inner wall of the main body 2 forms an outer flow channel 302, and a portion of the water flow from the inlet 21 of the main body 2 reaches the outlet 22 after passing through the outer flow channel 302; at least one through hole is provided inside the shear member 3, which forms an inner flow channel 303 of the shear member 3.

[0109] To facilitate better diversion of the water flow from inlet 21 into the outer flow channel 302 and the inner flow channel 303, and to facilitate the impact of the water flow on the shear member 3, thereby pushing the shear member 3, the diameter of the hole at the end of the shear member 3 near the inlet 21 of the main body 2 can be smaller than the diameter of the inlet 21. Therefore, when a large amount of water enters through inlet 21, some water enters the through hole, and some water impacts the shear member 3, pushing it open. As a result, some water also flows into the outer flow channel 302 through the space between the shear member 3 and the inlet 21.

[0110] When water flows into the cavitation cavity through the inlet 21, it is split into the inner flow channel 303 (through hole) and the outer flow channel 302 (guide groove). The inner flow channel 303 is a through hole, and the water flows directly in without being affected by the flow velocity. However, when it enters the outer flow channel 302, the flow velocity is slowed down due to the structure of the shearing element 3 itself. Therefore, the two water flows merge at the outlet 22 with different flow velocities, thereby achieving the liquid-liquid shearing effect. The reciprocating motion of the shearing element 3 also achieves the solid-liquid shearing effect.

[0111] It should be noted that this embodiment does not impose structural restrictions on the water flow space between the outside and the inner wall of the main body 2, nor does it impose restrictions on the number of through holes inside the shearing member 3.

[0112] In a preferred embodiment of this invention, the outer wall of the shear member 3 is provided with a guide groove, and the outer flow channel 302 is defined as the guide groove. In this embodiment, the guide groove is provided in two ways:

[0113] 1. A guide groove is provided along the water flow direction. The outer flow channel 302 is defined as this guide groove, which can play a role in guiding the water flow. Specifically, there are two ways to form the guide groove: one is to form a groove structure by recessing the outer wall of the shearing part 3; the other is to design a plate-like protrusion to form a groove structure. These two are just to introduce the formation methods of the guide groove. The actual mold making should be selected according to actual needs.

[0114] Second, a guide groove is spirally provided along the outer wall of the shearing member 3, adding an additional implementation method. The shearing member 3 is made into a spindle shape, and the spiral groove on the outer wall forms a vortex groove 302a (the outer flow channel 302 is defined as this vortex groove 302a). When the fluid passes through, it will drive the vortex center body (at this time, the shearing member 3) to move and rotate, increasing the shearing effect. Furthermore, the vortex center body 3a (at this time, the shearing member 3) is implemented as a spindle shape, with its middle section outer diameter > both ends (at least larger than the outer diameter of the end that first contacts the fluid). Based on the principle of the Venturi tube, the change in pipe diameter will cause a change in the internal pressure of the pipe. The decrease in fluid pressure in the middle section of the vortex center body is also conducive to cavitation.

[0115] Furthermore, to facilitate the shearing effect of the shearing component 3, the shearing component 3 is spindle-shaped, with its diameter gradually decreasing from the middle to both ends, while the depth of the guide groove gradually increases from the middle to both ends. The shearing cavitation effect is further improved by varying the space between the outer diameter of the shearing component 3 and the inner wall of the cavitation cavity.

[0116] In a preferred embodiment of this invention, the shear member 3 has one internal through-hole. Preferably, this through-hole is a variable-diameter through-hole, the diameter of which gradually decreases from the inlet end to the outlet end. Therefore, the variable-diameter through-hole has a larger diameter upstream and a smaller diameter downstream, making it easier for the shear member 3 to be moved by the water flow.

[0117] Furthermore, to further enhance the water flow shear cavitation effect of the outer flow channel 302 and the inner flow channel 303, an exchange port 301 communicating with the inner flow channel 303 is provided at the outer flow channel 302. This exchange port 301 allows for pre-mixing and shearing between the inner and outer liquid layers, increasing the bubble content and causing bubbles to split into smaller, denser bubbles during secondary shearing downstream of the cavitation chamber. Preferably, the number of exchange ports 301 can be one or more. When the outer flow channel 302 is a guide channel, the number of exchange ports 301 is consistent with the number of guide channels and is correspondingly located within the guide channels.

[0118] Taking car wash equipment as an example, after installing shear-type cavitation nozzles, when spraying water and cleaning foam on the car body, the shearing action of the liquid can generate foam better, making the foam richer and more conducive to cleaning the car; similarly, atomizing equipment can make atomization more uniform by shearing the liquid through the nozzle.

[0119] Those skilled in the art should understand that the embodiments of the present invention described above are merely examples and do not limit the invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations of the implementation of the present invention may be made without departing from the stated principles.

Claims

1. A shearing cavitation nozzle for a dental flosser, characterized in that, The device includes a main body and a shearing component. The main body has a cavitation cavity inside, and its two ends are respectively provided with an inlet and an outlet communicating with the cavitation cavity. The shearing component is disposed within the cavitation cavity and has an inner flow channel and an outer flow channel. The inlet ends of the inner and outer flow channels correspond to the inlet, and the outlet ends of the inner and outer flow channels correspond to the outlet. The water flow inside and outside the shearing component forms a velocity difference with the inner flow being faster and the outer flow being slower. The shearing component reciprocates within the cavitation cavity driven by the pulsed water flow at the inlet. An exchange hole communicating with the inner flow channel is also provided at the outer flow channel. The inner flow channel is defined as a through hole provided in the shearing component, and the outer flow channel is defined as the water flow space between the shearing component and the main body. The device also includes an elastic reset component, which is disposed between the shearing component and the main body. The shearing component, after being subjected to the water flow pressure at the inlet, reciprocates with the elastic reset component to shear the cavitation water flow.

2. The shear-type cavitation nozzle according to claim 1, characterized in that: The outer wall of the shearing member is provided with a guide groove, and the outer flow channel is defined as the guide groove.

3. The shear-type cavitation nozzle according to claim 2, characterized in that: The guide groove is a guide groove arranged along the water flow direction, or a guide groove spirally arranged on the outer wall of the shearing member.

4. The shear-type cavitation nozzle according to claim 3, characterized in that: When the guide groove is set along the water flow direction, the depth of the guide groove gradually increases from the middle to both ends.

5. The shear-type cavitation nozzle according to claim 1, characterized in that: The diameter of the shearing element gradually decreases from the middle to both ends.

6. The shear-type cavitation nozzle according to claim 1, characterized in that: The through hole is a variable diameter through hole, and the diameter of the variable diameter through hole gradually decreases from the water inlet end to the water outlet end.

7. The shear-type cavitation nozzle according to claim 1, characterized in that: The elastic reset element is a spring, which is located between the shearing element and the water outlet of the main body; the maximum elastic potential energy of the spring in the compressed state is greater than the maximum kinetic energy of the water flow on the shearing element.

8. The shear-type cavitation nozzle according to claim 1, characterized in that: The elastic reset element is a spring, with one end of the spring fixed to the shearing element and the other end fixed to the main body near the water inlet; the maximum elastic potential energy of the spring in the stretched state is greater than the maximum kinetic energy of the water flow on the shearing element.

9. A shearing cavitation type dental flosser, characterized in that, It includes a water flosser body and a shear-type cavitation nozzle as described in any of the preceding claims; the shear-type cavitation nozzle is installed on the water outlet pipe of the water flosser body.

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