Oscillating nozzle based on coanda effect, oral irrigator and application

Abstract

The invention relates to an oscillating nozzle based on the coanda effect, a water pick and application, and belongs to the field of liquid spray nozzles, fluid in the oscillating nozzle enters a main flow channel from a liquid inlet, part of the fluid generates the coanda effect when passing through a fluid attachment wall face and is introduced into a feedback flow channel, and the fluid is introduced into the main flow channel again after the feedback flow channel rotates. Fluid in the main runner is pushed to oscillate; on one hand, fluid in the main flow channel can be pushed to swing at a jet flow angle, the oscillation characteristic of liquid outlet spraying is formed, and the cleaning area and the oblique shearing effect of the cleaning face (compared with the traditional perpendicular water flow direction) are improved; on the other hand, fluid (water flow) in the main flow channel can be sheared to generate a cavitation effect, water-vapor combined jet flow is formed, and cleaning is better facilitated.

Description

Technical Field

[0001] This invention relates to the field of liquid nozzles, and more particularly to an oscillating nozzle, a water flosser, and its application based on the Coanda effect. Background Technology

[0002] The Coanda effect, also known as the wall adhesion effect or Coanda effect, refers to the tendency of a fluid (water or air) to deviate from its original flow direction and instead flow along a convex surface. When there is surface friction between the fluid and the surface it flows over (which can also be described as fluid viscosity), the fluid will flow along the surface of the object as long as the curvature is not too large.

[0003] A water flosser is an auxiliary tool for cleaning the oral cavity, using pulsed water jets to clean teeth and between teeth. The fluid is sprayed through a nozzle, but existing water flossers create a single point of pulsed water flow, requiring the user to move the device to increase the cleaning area.

[0004] This application aims to utilize the Coanda effect to optimize the jetting effect of a nozzle. Summary of the Invention

[0005] One objective of this invention is to provide a nozzle that ejects fluid in an oscillating manner;

[0006] A second objective of this invention is to provide a dental flosser that, in conjunction with an oscillating nozzle, enhances the shearing power of the jet and improves 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 an oscillating nozzle based on the Coanda effect, characterized in that it comprises:

[0009] The nozzle body has an internal oscillation chamber and an inlet and an outlet communicating with the oscillation chamber; a main channel is formed between the inlet and the outlet.

[0010] A wall-attachment generator is disposed within the oscillation chamber. The wall-attachment generator has a fluid wall-attachment surface facing the main flow channel that forms a Coanda effect. The oscillation chamber also has a feedback flow channel. The inlet of the feedback flow channel corresponds to the end of the fluid wall-attachment surface, and the outlet of the feedback flow channel converges at the end of the main flow channel near the inlet.

[0011] Preferably, the feedback channel is formed solely by the wall-attached generator; or, the feedback channel is formed by the wall-attached generator and the inner wall of the oscillating chamber of the nozzle body.

[0012] Preferably, the outer periphery of the wall-attached generator is adapted to the inner wall of the oscillation chamber, and the main flow channel extends through the wall-attached generator.

[0013] Preferably, the fluid-attached wall surface is configured at least near the end as a raised surface that forms a fluid Coanda effect and guides at least a portion of the fluid in the main flow channel into the feedback flow channel.

[0014] Preferably, the wall-attached generator is provided with a rotary feedback groove, and the feedback channel is formed by the rotary feedback groove and the inner wall of the oscillation chamber; the rotary feedback groove includes:

[0015] The first tank is located at the top of the wall-attached generator and near the liquid outlet;

[0016] The second tank is located at the bottom of the wall-attached generator and near the liquid inlet;

[0017] The third tank is formed on the side wall of the attached generator and is connected to the first tank and the second tank.

[0018] Preferably, the feedback channel has a first guide surface at the end corresponding to the fluid wall surface; the oscillation chamber has a second guide surface at the end corresponding to the main channel to guide the fluid to the outlet.

[0019] Preferably, the first guide surface is an inner arc-shaped surface, and the curvature of the first guide surface is adapted to the fluid inlet angle of the fluid-attached wall surface.

[0020] Preferably, the number of the feedback channel and the fluid wall surface is two, and they are arranged symmetrically about the main channel.

[0021] Preferably, one fluid-attached wall guides the fluid into the feedback channel to form a feedback jet. After the feedback jet in the feedback channel converges into the main channel, it generates a thrust that pushes the main jet in the main channel toward another fluid-attached wall.

[0022] Preferably, the nozzle body includes an oscillating tube and a top cover; the oscillating tube has an opening at the top, the top cover is fitted to the top opening of the oscillating tube, the liquid inlet is located at the bottom of the oscillating tube, and the liquid outlet is located at the top cover.

[0023] Preferably, the wall-attached generator has a first inlet at the bottom and a first outlet at the top; the inlet, the first inlet, the first outlet and the outlet are arranged along the axis of the main flow channel; the outlet of the feedback channel converges between the first inlet and the inlet.

[0024] Preferably, the size of the first inlet is larger than the liquid inlet but less than twice the size of the liquid inlet.

[0025] Preferably, the size of the first outlet is larger than that of the first inlet.

[0026] Preferably, the outlet is implemented as an outlet channel, the outlet channel is a gradually expanding channel, the inlet size of the outlet channel is smaller than the first outlet, and the outlet size of the outlet channel is larger than the inlet size of the outlet channel.

[0027] Preferably, the liquid outlet channel is implemented as a multi-pipe channel with the pipes forming a relative inclination angle, and the outlet of the liquid outlet channel is implemented as multiple outlets corresponding to different angles of fluid injection formed by the pipes.

[0028] Preferably, the main flow channel is a gradually expanding flow channel with a diameter that gradually increases from the inlet to the outlet; the feedback jet in the feedback flow channel converges into the main flow channel, forming a vortex between the fluid wall surface and the main jet of the main flow channel.

[0029] The above technical solutions, individually or in combination, exhibit the following beneficial effects:

[0030] Fluid enters the main channel from the inlet. As some fluid passes the fluid-attached surface, the Coanda effect occurs, and the fluid is introduced into the feedback channel. After the feedback channel rotates, the fluid is reintroduced into the main channel, causing the fluid in the main channel to oscillate. This can, on the one hand, cause the fluid in the main channel to change the jet angle, forming the oscillating characteristics of the jet at the outlet, increasing the cleaning area and the oblique (compared to the traditional vertical water flow) shearing effect of the cleaning surface; on the other hand, it can also shear the fluid (water flow) in the main channel to produce a cavitation effect, forming a water vapor combined jet, which is more conducive to cleaning.

[0031] When the feedback channels are set as two symmetrical ones, there are also two fluid attachment surfaces. When the fluid enters the main channel, it first attaches to one fluid attachment surface A, then enters the feedback channel A on the same side, and then re-enters the main channel from the outlet of feedback channel A, located between fluid attachment surface A and the main jet. This drives the main jet to switch attachment surfaces, eventually attaching to the other fluid attachment surface B, then entering the feedback channel B on the same side, and then re-entering the main channel from the outlet of feedback channel B, located between fluid attachment surface B and the main jet, repeating the attachment switching process. During this period, the main jet in the main channel is periodically driven by the feedback jet, causing the jet output from the outlet to also exhibit periodic oscillations, further forming an oscillating periodic characteristic.

[0032] The feedback channel merges into the main channel and impacts the main jet, forming a vortex between the main jet and the fluid wall. A large number of bubbles appear in the negative pressure zone at the center of the vortex, which further endows the nozzle with the cleaning characteristics of cavitation jet bubble bursting force.

[0033] The main channel is designed to gradually expand along the direction of water flow discharge, which facilitates the introduction of fluid from the main channel into the feedback channel by the fluid adhering to the wall surface at the wider section. The outlet can also be designed as a gradually expanding outlet channel, which facilitates the Coanda effect to occur again at the outlet channel, increasing the jet coverage area.

[0034] The outlet channel can be a single channel, a gradually expanding channel, or a multi-channel channel. When the outlet channel is a single straight pipe, the pipe length cannot be set too long, otherwise the oscillating water flow will become stable. When the outlet channel is a single gradually expanding pipe, the Coanda effect occurs again, and the oscillation characteristics are strengthened. When the outlet channel is multiple pipes, the oscillating jet can be selectively ejected from them. The outlet angles of the multi-channel channels are different, so the jet angles are different, thereby improving the cleaning ability.

[0035] Setting up a first and second guide surface can reduce the impact between the feedback jet and the main jet and the structure, thus playing a guiding role. This design is based on fluid self-vibration, has a simple structure, and is easy to manufacture; only one wall-mounted generator needs to be set inside the oscillating tube, making assembly simple.

[0036] Experiments showed that the size of the first inlet of the wall-attachment generator is larger than the liquid inlet but less than twice the size of the liquid inlet. This allows all the fluid from the liquid inlet to initially enter the main flow channel, preventing some fluid from entering the feedback flow channel from the outlet and causing significant flow loss due to collision with the feedback jet. However, as the first inlet increases, the near-middle wall surface of the fluid attachment surface moves away from the main jet, weakening the adsorption effect. This results in a slight deformation of the main jet in the main flow channel, preventing complete attachment and ultimately leading to a smaller deflection angle of the discharged jet. Therefore, this range yields the best results.

[0037] The size of the main channel outlet (i.e., the first outlet) is larger than the size of the inlet (i.e., the first inlet); because the main channel can be inverted cone or funnel-shaped, thus ensuring that the development area of ​​the feedback jet vortex and the oscillation amplitude of the main jet are left in the middle; so that the main jet can form a larger oscillation when it is ejected.

[0038] To address these two objectives, the present invention provides a jet oscillating oral irrigator based on the Coanda effect, characterized in that it includes an oral irrigator body and the aforementioned oscillating nozzle based on the Coanda effect; the oscillating nozzle based on the Coanda effect is installed on the water outlet pipe of the oral irrigator body.

[0039] The beneficial effects of adopting the above technical solutions are as follows:

[0040] By installing an oscillating nozzle based on the Coanda effect on the water outlet pipe of the oral irrigator, the water flow of the oral irrigator can form a periodic oscillating effect, increasing the cleaning area and spraying at a certain angle to increase shear force; it also has the ability to cavitate water flow, generating a large number of bubbles, thereby better removing dental plaque and cleaning the oral cavity.

[0041] To achieve its three objectives, this invention introduces the application of an oscillating nozzle based on the Coanda effect in cleaning equipment. The invention is characterized in that the oscillating nozzle based on the Coanda effect is installed in the spray pipeline of the cleaning equipment, which includes, but is not limited to, car wash equipment and atomizing equipment.

[0042] The beneficial effects of adopting the above technical solutions are as follows:

[0043] Taking car wash equipment as an example, after installing oscillating nozzles based on the Coanda effect, when spraying water and cleaning foam on the car body, the jet output from the outlet will also exhibit periodic oscillation, that is, further forming the periodic characteristics of oscillation. Then, the car washer only needs one angle to achieve oscillating spray from the nozzle at different angles, and the jet continues to impact the car surface at a certain angle, forming a shearing effect, which has a better effect on removing mud and sand. Attached Figure Description

[0044] Figure 1 A schematic diagram of the oscillating nozzle in this invention is shown.

[0045] Figure 2 The diagram shows the structural disassembly of the oscillating nozzle in this invention.

[0046] Figure 3 It expresses Figure 1 Sectional view at point AA.

[0047] Figure 4 It expresses Figure 3 Enlarged view of the middle section.

[0048] Figure 5 A schematic diagram of the structure of the wall-attached organism is shown.

[0049] Figure 6 This diagram illustrates the flow path of the oscillating chamber.

[0050] Figure 7 The diagram shows the streamline at the first moment of the wall attachment switching.

[0051] Figure 8 The streamline diagram shows the second moment of the wall attachment switching.

[0052] Figure 9 The streamline diagram shows the third moment of the wall-attachment switching.

[0053] Figure 10The streamline diagram shows the fourth moment of the wall-attachment switching.

[0054] Figure 11 The streamline diagram shows the fifth moment of the wall-attachment switching.

[0055] Figure 12 The streamline diagram shows the sixth moment of the wall-attachment switching.

[0056] Figure 13 The streamline diagram shows the seventh moment of the wall-attachment switching.

[0057] Figure 14 The streamline diagram shows the eighth moment of the wall-attachment switching.

[0058] in:

[0059]

[0060] Detailed Implementation

[0061] 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.

[0062] 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.

[0063] Example 1:

[0064] Please see Figures 1-6This embodiment provides an oscillating nozzle based on the Coanda effect, which generates oscillating water flow through the Coanda effect principle. Its structure includes a nozzle body and a wall-attachment generator 2; the nozzle body serves as the main structural element, and the wall-attachment generator 2 serves as the generator of the Coanda effect. The nozzle body has an oscillation chamber 30 inside, with an inlet 31 and an outlet connecting the oscillation chamber 30; a main flow channel 300 is formed between the inlet 31 and the outlet; the wall-attachment generator 2 is disposed within the oscillation chamber 30, and has a fluid wall-attachment surface 20 facing the main flow channel 300, forming a Coanda effect; the oscillation chamber 30 also has a feedback flow channel 22, with the inlet 201 of the feedback flow channel corresponding to the end of the fluid wall-attachment surface 20, and the outlet 202 of the feedback flow channel converging at the end of the main flow channel 300 near the inlet 31. Fluid enters the main channel 300 from the inlet 31. When some fluid passes through the fluid-attached wall 20, the Coanda effect occurs, and the fluid is introduced into the feedback channel 22. After the feedback channel 22 rotates, the fluid is reintroduced into the main channel 300, causing the fluid in the main channel 300 to oscillate. This can, on the one hand, cause the fluid in the main channel 300 to swing and change the jet angle, forming the oscillating characteristics of the outlet jet, increasing the cleaning area and the oblique (compared to the traditional vertical water flow direction) shearing effect of the cleaning surface; on the other hand, it can also shear the fluid (water flow) in the main channel 300 to produce a cavitation effect, forming a water vapor combined jet, which is more conducive to cleaning.

[0065] The above is necessary to achieve the technical objective of this embodiment. The following is a further detailed description in conjunction with the accompanying drawings:

[0066] The nozzle body serves as a structural carrier, and its structure can be integrally formed; considering the expectations of the attached generator 2 for 3D printing technology, it can also be integrally printed with the nozzle body; or it can be assembled by at least two structures.

[0067] For specific details, please refer to... Figure 2 and Figure 3 In a preferred embodiment of this invention, the nozzle body includes an oscillating tube 3 and a top cover 1. The oscillating tube 3 has an opening at its top, and the top cover 1 is fitted to the top opening of the oscillating tube 3. The aforementioned liquid inlet 31 is located at the bottom of the oscillating tube 3, while the liquid outlet is located at the top cover 1. The top cover 1 and the oscillating tube 3 can be assembled by means of threads, ultrasonic connection, bonding, etc.

[0068] The wall-attached generator 2, acting as a structural carrier for the Coanda effect, is structurally adapted to the inner wall of the nozzle body, ensuring a tight fit between the two. For details, please refer to [link / reference needed]. Figure 4The outer periphery of the wall-attached generator 2 is adapted to the inner wall of the oscillation chamber 30, and the main flow channel 300 passes through the wall-attached generator 2. When the nozzle body includes the oscillation tube 3, the wall-attached generator 2 has a cylindrical structure that is adapted to it. The bottom of the wall-attached generator 2 is provided with a first inlet 203, and the top is provided with a first outlet 204; the liquid inlet 31, the first inlet 203, the first outlet 204, and the liquid outlets (111, 112) are arranged along the axis of the main flow channel 300; the outlet 202 of the feedback flow channel converges between the first inlet 203 and the liquid inlet 31.

[0069] Furthermore, the feedback channel 22 is formed solely by the wall-mounted generator 2; or the feedback channel 22 is formed by the wall-mounted generator 2 and the inner wall of the oscillation chamber 30 of the nozzle body. As a preferred embodiment of this first embodiment, the feedback channel 22 is formed by the wall-mounted generator 2 and the inner wall of the oscillation chamber 30 of the nozzle body. Even further, the feedback channel 22 is formed by the wall-mounted generator 2 and the inner walls of the oscillation tube 3 and the top cover 1.

[0070] For specific details, please refer to... Figure 4 and Figure 5 The wall-mounted generator 2 is equipped with a rotary feedback channel, and the feedback channel 22 is formed by the rotary feedback channel and the inner wall of the oscillation chamber 30 (oscillation tube 3 and top cover 1). The rotary feedback channel includes a first channel 221, a second channel 223, and a third channel 222. The first channel 221 is located at the top of the wall-mounted generator 2 and near the liquid outlet; the second channel 223 is located at the bottom of the wall-mounted generator 2 and near the liquid inlet 31; the third channel 222 is located on the side wall of the wall-mounted generator 2 and connects to the first channel 221 and the second channel 223. This is a preferred embodiment of this invention and is not intended to limit the scope. If the feedback channel 22 is formed solely by the wall-mounted generator 2, the first channel 221, the second channel 223, and the third channel 222 can be replaced with a pipe formed in the wall-mounted generator 2.

[0071] Please see Figure 4 The main flow channel 300 is the main jet channel within the oscillation chamber 30. When the fluid enters the oscillation chamber 30, a portion undergoes wall adhesion and enters the feedback channel 22 to form a feedback jet, while the majority becomes the main jet flowing from the main channel to the outlet. To enhance the wall adhesion effect, the main flow channel 300 is a gradually expanding channel, with its diameter gradually increasing from the inlet 31 to the outlet, i.e., gradually increasing along the direction of the main jet. Specifically, the main flow channel 300 between at least the first inlet 203 and the first outlet 204 is a gradually expanding channel.

[0072] Correspondingly, the fluid-attached surface 20 is configured at least near the end as a raised surface 200 to create a fluid Coanda effect, and guides at least a portion of the fluid in the main flow channel 300 into the feedback flow channel 22 to form a feedback jet. The raised surface 200 is located near the main flow channel 300 where the diameter is larger, thus enabling better fluid adsorption and attachment.

[0073] Furthermore, to reduce the impact of the fluid on the inner wall of the oscillation chamber 30, the feedback channel 22 has a first guide surface 113 at the end corresponding to the fluid attachment surface 20; the oscillation chamber 30 has a second guide surface 114 at the end corresponding to the main channel 300, which guides the fluid to the outlet. Preferably, both the first guide surface 113 and the second guide surface 114 are inner arc-shaped surfaces; wherein, the curvature of the arc surface of the first guide surface 113 is adapted to the fluid inlet angle of the fluid attachment surface 20, which can more smoothly guide the fluid attached to the wall into the feedback channel 22. As shown in the figure, the first guide surface 113 and the second guide surface 114 are located on the side of the top cover 1 facing the oscillation chamber 30. They are segmented designs, and the adjacent point corresponds exactly to the end of the protruding surface 200, so that the feedback jet and the main jet are separated at this point.

[0074] While a single feedback channel 22 can create a deflection angle in the main jet after merging into the main channel 300, it does not form a periodicity. In this preferred embodiment, two feedback channels 22 and two fluid-attached walls 20 are arranged symmetrically about the main channel 300. Correspondingly, two first guide surfaces 113 and two second guide surfaces 114 are also provided. When one fluid-attached wall guides fluid into the feedback channel, the feedback jet in that channel converges into the main channel, creating a thrust that pushes the main jet in the main channel towards the other fluid-attached wall.

[0075] For details, please refer to Figure 4 When the feedback channels 22 are configured as two symmetrical surfaces, there are also two fluid attachment surfaces 20; the fluid switches between the two fluid attachment surfaces. For details, please refer to... Figure 6 and Figures 7-14 The wall attachment switching process is described in detail below:

[0076] Figure 7 The streamline diagram at 0.001s during the wall attachment switching process is shown. Figure 8 The streamline diagram at 0.01s during the wall attachment switching process is shown. Figure 9 The streamline diagram at 0.014s during the wall attachment switching process is shown. Figure 10 The streamline diagram at 0.016s during the wall attachment switching process is shown. Figure 11 The streamline diagram at 0.018s during the wall attachment switching process is shown. Figure 12 The streamline diagram at 0.02s during the wall attachment switching process is shown. Figure 13 The streamline diagram at 0.022s during the wall attachment switching process is shown.

[0077] Figure 14 The streamline diagram at 0.024s during the wall attachment switching process is shown. In this description, the two fluid attachment surfaces 20 are described as fluid attachment surface 20A and fluid attachment surface 20B, respectively; the two feedback channels 22 are described as feedback channel 22A and feedback channel 22B, respectively.

[0078] Please refer to Figures 7-10 When the fluid enters the main flow channel 300, it first gradually adheres to the fluid attachment surface 20A on one side. Then, the feedback jet enters the feedback flow channel 22A on that side, and then re-enters the main flow channel 300 from the outlet of the feedback flow channel 22A, located between the fluid attachment surface 20A and the main jet. Please refer to [link to relevant documentation]. Figures 11-13 The feedback jet drives the main jet to switch attachment surfaces, eventually attaching to the fluid attachment surface 20B on the other side. It then enters the feedback channel 22B on that side, and from the outlet of the feedback channel 22B, it re-enters the main channel 300, located between the fluid attachment surface 20B and the main jet, repeating the attachment switching process (see [link]). Figure 14 During this period, the main jet of the main channel 300 is periodically driven by the feedback jet, causing the jet output from the outlet to also exhibit periodic oscillations, further forming the periodic characteristics of oscillation. Meanwhile, the feedback channel 22 merges into the main channel 300 and impacts the main jet, forming a vortex between the main jet and the fluid wall surface 20. A large number of bubbles will appear in the negative pressure zone at the center of the vortex, giving the nozzle further the cleaning characteristics of cavitation jet bubble bursting force.

[0079] As described above, the wall-attached generator 2 has a first inlet 203 at the bottom and a first outlet 204 at the top; the liquid inlet 31, the first inlet 203, the first outlet 204 and the liquid outlet are arranged along the axis of the main flow channel 300; the outlet 202 of the feedback flow channel converges between the first inlet 203 and the liquid inlet 31.

[0080] On the one hand, to ensure that all fluid initially enters the main flow channel 300 from the inlet 31, preventing any fluid from flowing backwards from the outlet 202 of the feedback channel into the feedback flow channel 22, thus avoiding significant flow loss due to conflict with the intended feedback jet, the first inlet 203 is larger than twice the size of the inlet 31 in this preferred embodiment. Furthermore, as the first inlet 203 increases in size, the near-middle wall surface of the fluid adhesion surface 20 moves further away from the main jet, weakening the adsorption effect and resulting in incomplete adhesion. Consequently, the deflection angle of the discharged jet is also smaller. Therefore, through repeated experiments, it has been determined that the size of the first inlet 203 should be less than twice the size of the inlet 31 in this preferred embodiment.

[0081] Furthermore, the size of the first outlet 204 of the main channel 300 should be larger than the size of the first inlet. As mentioned above, the main channel 300 can be a gradually expanding channel such as an inverted cone or a funnel, to ensure that the development area of ​​the vortex and the swing amplitude space of the main jet are left in the middle.

[0082] For a better option, please combine... Figure 3 and Figure 4 The outlet is implemented as an outlet channel 11, which has an outlet inlet 111 and an outlet 112. Furthermore, in order to prevent the main jet from being discharged directly, the size of the outlet inlet 111 is smaller than the size of the first outlet 204 of the wall-attached generator 2.

[0083] The liquid outlet channel 11 can take many forms:

[0084] 1. When the dimensions of the liquid inlet 111 and the liquid outlet 112 are equal, the liquid outlet channel 11 is a channel of equal diameter. At this time, the liquid outlet channel 11 is a single straight pipe. The pipe length cannot be set too long, otherwise the oscillating water flow will become stable. This is not shown in the figure.

[0085] 2. When the size of the liquid outlet 111 is smaller than the size of the liquid outlet 112, such as Figure 4 As shown, the outlet channel 11 is a single gradually expanding pipe, and the Coanda effect will occur again, the oscillation characteristics will be strengthened, and the water flow amplitude will increase.

[0086] 3. The liquid outlet channel 11 is implemented as a multi-pipe channel with relative inclination between the pipes. The outlet of the liquid outlet channel 11 is implemented as multiple outlets corresponding to different angles of fluid spraying formed by the pipes. At this time, the oscillating jet can be selectively sprayed out from it, which is not shown in the figure.

[0087] The beneficial effects of adopting the above solution in this embodiment are as follows:

[0088] Fluid enters the main channel 300 from the inlet 31. When some fluid passes through the fluid-attached wall 20, the Coanda effect occurs, and the fluid is introduced into the feedback channel 22. After the feedback channel 22 rotates, the fluid is reintroduced into the main channel 300, causing the fluid in the main channel 300 to oscillate. This can, on the one hand, cause the fluid in the main channel 300 to swing at the jet angle, forming the oscillating characteristics of the outlet spray, increasing the cleaning area and the oblique (compared to the traditional vertical water flow direction) shearing effect of the cleaning surface; on the other hand, it can also shear the fluid (water flow) in the main channel 300 to produce a cavitation effect, forming a water vapor combined jet, which is more conducive to cleaning.

[0089] When the feedback channels 22 are configured as two symmetrical ones, there are also two fluid attachment surfaces 20. When the fluid enters the main flow channel 300, it first attaches to one fluid attachment surface 20A, then enters the feedback channel 22A on that side, and then re-enters the main flow channel 300 from the outlet of the feedback channel 22A, located between the fluid attachment surface 20A and the main jet. This drives the main jet to switch attachment surfaces, eventually attaching to the other fluid attachment surface 20B, then entering the feedback channel 22B on that side, and then re-entering the main flow channel 300 from the outlet of the feedback channel 22B, located between the fluid attachment surface 20B and the main jet, repeating the attachment switching process. During this period, the main jet in the main flow channel 300 is periodically driven by the feedback jet, causing the jet output from the outlet to also exhibit periodic oscillations, further forming a periodic oscillating characteristic.

[0090] The feedback channel 22 merges into the main channel 300 and impacts the main jet, forming a vortex between the main jet and the fluid wall surface 20. A large number of bubbles will appear in the negative pressure zone at the center of the vortex, which makes the nozzle further have the cleaning characteristics of cavitation jet bubble bursting force.

[0091] The main channel 300 is configured to gradually expand along the water discharge direction, which facilitates the introduction of fluid from the main channel 300 into the feedback channel 22 by the fluid adhering surface 20 at the wider section. The outlet can also be configured as a gradually expanding outlet channel 11, which facilitates the Coanda effect at the outlet channel 11, increasing the jet coverage area.

[0092] The outlet channel 11 can be a single channel, a gradually expanding channel, or a multi-channel channel. When the outlet channel 11 is a single straight channel, the pipe length cannot be set too long, otherwise the oscillating water flow will become stable. When the outlet channel is a single gradually expanding channel, the Coanda effect occurs again, and the oscillation characteristics are strengthened. When the outlet channel is a multi-channel channel, the oscillating jet can be selectively ejected from it. The outlet angles of the multi-channel channels are different, so the jet angles are different, thereby improving the cleaning ability.

[0093] The first guide surface 113 and the second guide surface 114 are provided to reduce the impact between the feedback jet and the main jet and the structure, thus serving as a guide. This design is based on fluid self-vibration, has a simple structure, and is easy to manufacture; only one wall-mounted generator 2 needs to be set inside the oscillating tube 3, making assembly simple.

[0094] Experiments showed that the size of the first inlet 203 of the wall-attachment generator 2 is larger than the liquid inlet 31 but less than twice the size of the liquid inlet 31. This allows the fluid in the liquid inlet 31 to initially enter the main flow channel 300 completely, preventing a portion of the fluid from entering the feedback flow channel 22 from the outlet, which would cause a huge flow loss due to the collision with the feedback jet. However, as the first inlet 203 increases, the near-middle wall surface of the fluid attachment surface 20 moves away from the main jet, resulting in a weakened adsorption effect. This causes the main jet in the main flow channel 300 to deform slightly and fail to fully attach to the wall, resulting in a smaller deflection angle of the final discharged jet. Therefore, this range is the optimal range.

[0095] The size of the outlet (i.e., the first outlet 204) of the main channel 300 is larger than the size of the inlet (i.e., the first inlet); because the main channel 300 can be an inverted cone or a funnel shape, thus ensuring that the development area of ​​the vortex of the feedback jet and the oscillation amplitude of the main jet are left in the middle; so that the main jet can form a larger oscillation when it is ejected.

[0096] Example 2:

[0097] This embodiment provides a Coanda-effect-based jet oscillating oral irrigator, including an oral irrigator body and an oscillating nozzle based on the Coanda effect. The oscillating nozzle based on the Coanda effect is installed on the water outlet pipe of the oral irrigator body. Here, the water outlet pipe of the oral irrigator body is implemented as a spray bar.

[0098] The oscillating nozzle includes a nozzle body and a wall-attachment generator 2; the nozzle body serves as the main structure, and the wall-attachment generator 2 serves as the generator of the Coanda effect. The nozzle body has an oscillation chamber 30 inside, and an inlet 31 and an outlet communicating with the oscillation chamber 30; a main flow channel 300 is formed between the inlet 31 and the outlet; the wall-attachment generator 2 is disposed within the oscillation chamber 30, and has a fluid wall-attachment surface 20 facing the main flow channel 300, which generates the Coanda effect; the oscillation chamber 30 also has a feedback flow channel 22, the inlet 201 of which corresponds to the end of the fluid wall-attachment surface 20, and the outlet 202 of which converges at the end of the main flow channel 300 near the inlet 31.

[0099] The nozzle body serves as a structural carrier, and its structure can be integrally formed; combined with the expectations of the attached wall generator 2 for 3D printing technology, it can be integrally printed; or it can be assembled by at least two structures.

[0100] For specific details, please refer to... Figure 2 and Figure 3In a preferred embodiment of this invention, the nozzle body includes an oscillating tube 3 and a top cover 1. The oscillating tube 3 has an opening at its top, and the top cover 1 is fitted to the top opening of the oscillating tube 3. The aforementioned liquid inlet 31 is located at the bottom of the oscillating tube 3, while the liquid outlet is located at the top cover 1. The top cover 1 and the oscillating tube 3 can be assembled by means of threads, ultrasonic connection, bonding, etc.

[0101] The wall-attached generator 2, acting as a structural carrier for the Coanda effect, is structurally adapted to the inner wall of the nozzle body, ensuring a tight fit between the two. For details, please refer to [link / reference needed]. Figure 4 The outer periphery of the wall-attached generator 2 is adapted to the inner wall of the oscillation chamber 30, and the main flow channel 300 passes through the wall-attached generator 2. When the nozzle body includes the oscillation tube 3, the wall-attached generator 2 has a cylindrical structure that is adapted to it. The bottom of the wall-attached generator 2 is provided with a first inlet 203, and the top is provided with a first outlet 204; the liquid inlet 31, the first inlet 203, the first outlet 204, and the liquid outlet are arranged along the axis of the main flow channel 300; the outlet 202 of the feedback flow channel converges between the first inlet 203 and the liquid inlet 31.

[0102] Furthermore, the feedback channel 22 is formed solely by the wall-mounted generator 2; or the feedback channel 22 is formed by the wall-mounted generator 2 and the inner wall of the oscillation chamber 30 of the nozzle body. As a preferred embodiment of this first embodiment, the feedback channel 22 is formed by the wall-mounted generator 2 and the inner wall of the oscillation chamber 30 of the nozzle body. Even further, the feedback channel 22 is formed by the wall-mounted generator 2 and the inner walls of the oscillation tube 3 and the top cover 1.

[0103] For specific details, please refer to... Figure 4 and Figure 5 The wall-mounted generator 2 is equipped with a rotary feedback channel, and the feedback channel 22 is formed by the rotary feedback channel and the inner wall of the oscillation chamber 30 (oscillation tube 3 and top cover 1). The rotary feedback channel includes a first channel 221, a second channel 223, and a third channel 222. The first channel 221 is located at the top of the wall-mounted generator 2 and near the liquid outlet; the second channel 223 is located at the bottom of the wall-mounted generator 2 and near the liquid inlet 31; the third channel 222 is located on the side wall of the wall-mounted generator 2 and connects to the first channel 221 and the second channel 223. This is a preferred embodiment of this invention and is not intended to limit the scope. If the feedback channel 22 is formed solely by the wall-mounted generator 2, the first channel 221, the second channel 223, and the third channel 222 can be replaced with a pipe formed in the wall-mounted generator 2.

[0104] Please see Figure 4The main flow channel 300 is the main jet channel within the oscillation chamber 30. When the fluid enters the oscillation chamber 30, a portion undergoes wall adhesion and enters the feedback channel 22 to form a feedback jet, while the majority becomes the main jet flowing from the main channel to the outlet. To enhance the wall adhesion effect, the main flow channel 300 is a gradually expanding channel, with its diameter gradually increasing from the inlet 31 to the outlet, i.e., gradually increasing along the direction of the main jet. Specifically, the main flow channel 300 between at least the first inlet 203 and the first outlet 204 is a gradually expanding channel.

[0105] Correspondingly, the fluid-attached surface 20 is configured at least near the end as a raised surface 200 to create a fluid Coanda effect, and guides at least a portion of the fluid in the main flow channel 300 into the feedback flow channel 22 to form a feedback jet. The raised surface 200 is located near the main flow channel 300 where the diameter is larger, thus enabling better fluid adsorption and attachment.

[0106] Furthermore, to reduce the impact of the fluid on the inner wall of the oscillation chamber 30, the feedback channel 22 has a first guide surface 113 at the end corresponding to the fluid attachment surface 20; the oscillation chamber 30 has a second guide surface 114 at the end corresponding to the main channel 300, which guides the fluid to the outlet. Preferably, both the first guide surface 113 and the second guide surface 114 are inner arc-shaped surfaces; wherein, the curvature of the arc surface of the first guide surface 113 is adapted to the fluid inlet angle of the fluid attachment surface 20, which can more smoothly guide the fluid attached to the wall into the feedback channel 22. As shown in the figure, the first guide surface 113 and the second guide surface 114 are located on the side of the top cover 1 facing the oscillation chamber 30. They are segmented designs, and the adjacent point corresponds exactly to the end of the protruding surface 200, so that the feedback jet and the main jet are separated at this point.

[0107] While a single feedback channel 22 can create a deflection angle in the main jet after merging into the main channel 300, it does not form a periodicity. In this preferred embodiment, two feedback channels 22 and two fluid-attached walls 20 are arranged symmetrically about the main channel 300. Correspondingly, two first guide surfaces 113 and two second guide surfaces 114 are also provided. When one fluid-attached wall guides fluid into the feedback channel, the feedback jet in that channel converges into the main channel, creating a thrust that pushes the main jet in the main channel towards the other fluid-attached wall.

[0108] For details, please refer to Figure 4 When the feedback channels 22 are configured as two symmetrical surfaces, there are also two fluid attachment surfaces 20; the fluid switches between the two fluid attachment surfaces. For details, please refer to... Figure 6 and Figures 7-14 The wall attachment switching process is described in detail below:

[0109] Figure 7The streamline diagram at 0.001s during the wall attachment switching process is shown. Figure 8 The streamline diagram at 0.01s during the wall attachment switching process is shown. Figure 9 The streamline diagram at 0.014s during the wall attachment switching process is shown. Figure 10 The streamline diagram at 0.016s during the wall attachment switching process is shown. Figure 11 The streamline diagram at 0.018s during the wall attachment switching process is shown. Figure 12 The streamline diagram at 0.02s during the wall attachment switching process is shown. Figure 13 The streamline diagram at 0.022s during the wall attachment switching process is shown.

[0110] Figure 14 The streamline diagram at 0.024s during the wall attachment switching process is shown. In this description, the two fluid attachment surfaces 20 are described as fluid attachment surface 20A and fluid attachment surface 20B, respectively; the two feedback channels 22 are described as feedback channel 22A and feedback channel 22B, respectively.

[0111] Please refer to Figures 7-10 When the fluid enters the main flow channel 300, it first gradually adheres to the fluid attachment surface 20A on one side. Then, the feedback jet enters the feedback flow channel 22A on that side, and then re-enters the main flow channel 300 from the outlet of the feedback flow channel 22A, located between the fluid attachment surface 20A and the main jet. Please refer to [link to relevant documentation]. Figures 11-13 The feedback jet drives the main jet to switch attachment surfaces, eventually attaching to the fluid attachment surface 20B on the other side. It then enters the feedback channel 22B on that side, and from the outlet of the feedback channel 22B, it re-enters the main channel 300, located between the fluid attachment surface 20B and the main jet, repeating the attachment switching process (see [link]). Figure 14 During this period, the main jet of the main channel 300 is periodically driven by the feedback jet, causing the jet output from the outlet to also exhibit periodic oscillations, further forming the periodic characteristics of oscillation. Meanwhile, the feedback channel 22 merges into the main channel 300 and impacts the main jet, forming a vortex between the main jet and the fluid wall surface 20. A large number of bubbles will appear in the negative pressure zone at the center of the vortex, giving the nozzle further the cleaning characteristics of cavitation jet bubble bursting force.

[0112] As described above, the wall-attached generator 2 has a first inlet 203 at the bottom and a first outlet 204 at the top; the liquid inlet 31, the first inlet 203, the first outlet 204 and the liquid outlet are arranged along the axis of the main flow channel 300; the outlet 202 of the feedback flow channel converges between the first inlet 203 and the liquid inlet 31.

[0113] On the one hand, to ensure that all fluid initially enters the main flow channel 300 from the inlet 31, preventing any fluid from flowing backwards from the outlet 202 of the feedback channel into the feedback flow channel 22, thus avoiding significant flow loss due to conflict with the intended feedback jet, the size of the first inlet 203 is larger than that of the inlet 31 in this preferred embodiment. Furthermore, as the first inlet 203 increases in size, the near-middle wall surface of the fluid adhesion surface 20 moves further away from the main jet, weakening the adsorption effect and resulting in incomplete adhesion. Consequently, the deflection angle of the discharged jet is also smaller. Therefore, through repeated experiments, it has been determined that the size of the first inlet 203 should be less than twice the size of the inlet 31 in this preferred embodiment.

[0114] Furthermore, the size of the first outlet 204 of the main channel 300 should be larger than the size of the first inlet. As mentioned above, the main channel 300 can be a gradually expanding channel such as an inverted cone or a funnel, to ensure that the development area of ​​the vortex and the swing amplitude space of the main jet are left in the middle.

[0115] For a better option, please combine... Figure 3 and Figure 4 The outlet is implemented as an outlet channel 11, which has an outlet inlet 111 and an outlet 112. Furthermore, in order to prevent the main jet from being discharged directly, the size of the outlet inlet 111 is smaller than the size of the first outlet 204 of the wall-attached generator 2.

[0116] The liquid outlet channel 11 can take many forms:

[0117] 1. When the dimensions of the liquid inlet 111 and the liquid outlet 112 are equal, the liquid outlet channel 11 is a channel of equal diameter. At this time, the liquid outlet channel 11 is a single straight pipe. The pipe length cannot be set too long, otherwise the oscillating water flow will become stable. This is not shown in the figure.

[0118] 2. When the size of the liquid outlet 111 is smaller than the size of the liquid outlet 112, such as Figure 4 As shown, the outlet channel 11 is a single gradually expanding pipe, and the Coanda effect will occur again, the oscillation characteristics will be strengthened, and the water flow amplitude will increase.

[0119] 3. The liquid outlet channel 11 is implemented as a multi-pipe channel with relative inclination between the pipes. The outlet of the liquid outlet channel 11 is implemented as multiple outlets corresponding to different angles of fluid spraying formed by the pipes. At this time, the oscillating jet can be selectively sprayed out from it, which is not shown in the figure.

[0120] The beneficial effects of adopting the above technical solutions are as follows:

[0121] By installing an oscillating nozzle based on the Coanda effect on the water outlet pipe of the oral irrigator, the water flow of the oral irrigator can form a periodic oscillating effect, increasing the cleaning area and spraying at a certain angle to increase shear force; it also has the ability to cavitate water flow, generating a large number of bubbles, thereby better removing dental plaque and cleaning the oral cavity.

[0122] Example 3:

[0123] This embodiment describes the application of a Coanda effect-based oscillating nozzle in a cleaning device. The Coanda effect-based oscillating nozzle is installed in the spray pipeline of the cleaning device, which includes, but is not limited to, car wash equipment and atomizing equipment.

[0124] The oscillating nozzle based on the Coanda effect has been described in detail in Example 1, so this example will not describe the oscillating nozzle again. Those skilled in the art should be able to obtain the specific structure and function of the oscillating nozzle based on the content described in Example 1.

[0125] The beneficial effects of adopting the above technical solutions are as follows:

[0126] Taking car wash equipment as an example, after installing oscillating nozzles based on the Coanda effect, when spraying water and cleaning foam on the car body, the jet output from the outlet will also exhibit periodic oscillation, that is, further forming the periodic characteristics of oscillation. Then, the car washer only needs one angle to achieve oscillating spray from the nozzle at different angles, and the jet continues to impact the car surface at a certain angle, forming a shearing effect, which has a better effect on removing mud and sand.

[0127] 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. An oscillating nozzle based on the Coanda effect, characterized in that, include: The nozzle body has an internal oscillation chamber and an inlet and an outlet communicating with the oscillation chamber. A main channel is formed between the liquid inlet and the liquid outlet; A wall-attachment generator is disposed in the oscillation chamber, and the wall-attachment generator has a fluid wall-attachment surface facing the main channel that forms a Coanda effect. The oscillation chamber also has a feedback channel, the inlet of which corresponds to the end of the fluid attached to the wall, and the outlet of which converges at the end of the main channel near the inlet.

2. The oscillating nozzle based on the Coanda effect according to claim 1, characterized in that: The feedback channel is formed solely by the wall-attached generator; or, the feedback channel is formed by the cooperation of the wall-attached generator and the inner wall of the oscillating chamber of the nozzle body.

3. The oscillating nozzle based on the Coanda effect according to claim 2, characterized in that: The outer periphery of the wall-attached generator is adapted to the inner wall of the oscillation chamber, and the main flow channel runs through the wall-attached generator.

4. The oscillating nozzle based on the Coanda effect according to claim 2, characterized in that: The fluid-attached wall surface is implemented as a raised surface that forms a fluid Coanda effect, at least near the end, and guides at least a portion of the fluid in the main flow channel into the feedback flow channel.

5. The oscillating nozzle based on the Coanda effect according to claim 2, characterized in that: The wall-mounted generator is provided with a rotary feedback groove, and the feedback channel is formed by the rotary feedback groove and the inner wall of the oscillation chamber; the rotary feedback groove includes: The first tank is located at the top of the wall-attached generator and near the liquid outlet; The second tank is located at the bottom of the wall-attached generator and near the liquid inlet; The third tank is formed on the side wall of the attached generator and is connected to the first tank and the second tank.

6. The oscillating nozzle based on the Coanda effect according to claim 5, characterized in that: The feedback channel has a first guide surface at the end corresponding to the fluid wall surface; the oscillation chamber has a second guide surface at the end corresponding to the main channel to guide the fluid to the outlet.

7. The oscillating nozzle based on the Coanda effect according to claim 6, characterized in that: The first guide surface is an inner arc-shaped surface, and the curvature of the first guide surface is adapted to the fluid inlet angle of the fluid attached to the wall surface.

8. The oscillating nozzle based on the Coanda effect according to any one of claims 4-7, characterized in that: The number of feedback channels and fluid-attached walls is two, and they are arranged symmetrically with the main channel as the axis.

9. The oscillating nozzle based on the Coanda effect according to claim 8, characterized in that: One fluid-attached wall guides the fluid into the feedback channel to form a feedback jet. After the feedback jet in the feedback channel converges into the main channel, it generates a thrust that pushes the main jet in the main channel toward another fluid-attached wall.

10. The oscillating nozzle based on the Coanda effect according to claim 1, characterized in that: The nozzle body includes an oscillating tube and a top cover; the oscillating tube has an opening at the top, the top cover is fitted to the top opening of the oscillating tube, the liquid inlet is located at the bottom of the oscillating tube, and the liquid outlet is located at the top cover.

11. The oscillating nozzle based on the Coanda effect according to claim 10, characterized in that: The wall-attached generator has a first inlet at the bottom and a first outlet at the top; the inlet, the first inlet, the first outlet and the outlet are arranged along the axis of the main flow channel; the outlet of the feedback channel converges between the first inlet and the inlet.

12. The oscillating nozzle based on the Coanda effect according to claim 11, characterized in that: The size of the first inlet is greater than one times the size of the liquid inlet and less than twice the size of the liquid inlet.

13. The oscillating nozzle based on the Coanda effect according to claim 12, characterized in that: The size of the first outlet is larger than that of the first inlet.

14. The oscillating nozzle based on the Coanda effect according to claim 11, characterized in that: The outlet is implemented as an outlet channel, which is a gradually expanding channel. The inlet size of the outlet channel is smaller than the first outlet, and the outlet size of the outlet channel is larger than the inlet size.

15. The oscillating nozzle based on the Coanda effect according to claim 14, characterized in that: The liquid outlet channel is implemented as a multi-pipe channel with the pipes forming a relative inclination angle, and the outlet of the liquid outlet channel is implemented as multiple outlets corresponding to the multiple pipes to form different angles of fluid injection.

16. The oscillating nozzle based on the Coanda effect according to claim 11, characterized in that: The main flow channel is a gradually expanding flow channel, with its diameter gradually increasing from the inlet to the outlet. The feedback jet in the feedback flow channel converges into the main flow channel, forming a vortex between the fluid wall surface and the main jet of the main flow channel.

17. A jet oscillating dental flosser based on the Coanda effect, characterized in that, It includes a water flosser body and an oscillating nozzle based on the Coanda effect as described in any one of claims 1 to 16; the oscillating nozzle based on the Coanda effect is installed on the water outlet pipe of the water flosser body.

18. The application of an oscillating nozzle based on the Coanda effect in cleaning equipment, characterized in that, The oscillating nozzle based on the Coanda effect described in any one of claims 1 to 16 is installed in the spray pipe of the cleaning equipment, and the cleaning equipment includes, but is not limited to, car wash equipment and atomizing equipment.

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