Water-air mixing system and oral irrigator

Abstract

This invention relates to a water-air mixing system and a dental flosser. The water-air mixing system includes a water pipeline consisting of an inlet pipe, an inlet valve, an outlet pipe, and an outlet valve; a gas pipeline consisting of an inlet pipe, an inlet valve, an outlet pipe, and an outlet valve; a mixing pipeline; and a power unit. The power unit includes a piston cylinder, a piston, and a power component. When the piston reciprocates, water and air are delivered to the mixing channel at equal frequencies and pressures. The water flowing out of the mixing channel is pulsed and dispersed. Under a constant frequency and reciprocating motion, this invention not only forms pulsed and dispersed water flows at equal frequencies and pressures, but also achieves a high degree of consistency in the rinsing effect between the two pulses. This satisfies the requirements for pressure and good dispersion in dental flossing, while maintaining a constant water-air mixing ratio and minimal variation in rinsing amplitude between the two pulses, resulting in a superior user experience.

Description

Technical Field

[0001] This invention belongs to the field of water-air mixing technology, specifically relating to a water-air mixing system, and also to a dental flosser with a water-air mixing system. Background Technology

[0002] As we all know, a water flosser is an auxiliary tool for cleaning the oral cavity. It mainly uses pulsed water flow to clean teeth and between teeth. The market mainly offers portable or countertop models, and the rinsing pressure is approximately 90 psi or less.

[0003] Currently, there are two rinsing methods: 1. Pure water rinsing; 2. Water-air mixed rinsing. However, for pure water rinsing, the resulting pulsed water flow is entirely dependent on the nozzle used, and the impact pressure and the dispersion effect of the water jet are difficult to control, potentially damaging teeth or gums or failing to clean thoroughly. Meanwhile, water-air mixed rinsing primarily uses a mixture of water and air, with the gas dispersing the water flow for pulsed rinsing of teeth or gums. Therefore, water-air mixed rinsing is more common in the market. However, water-air mixed rinsing requires a combination of water and air pumps, and the air and water output must be synchronized. This necessitates two power sources, and the interval between pulsed rinsing pulses is difficult to control. Furthermore, the rinsing pressure and effect vary significantly between pulses, causing discomfort for users. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a novel water-air mixing system.

[0005] In addition, the present invention also relates to a dental flosser.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A water-air mixing system, comprising:

[0008] Water flow pipeline, which includes inlet pipe, inlet valve, outlet pipe, and outlet valve;

[0009] Gas pipeline, which includes an inlet pipe, an inlet valve, an outlet pipe, and an outlet valve;

[0010] A mixing pipeline, which forms a mixing channel inside and is connected to the water outlet pipe and the air outlet pipe respectively;

[0011] The power unit includes a piston cylinder, a piston, and a power component that drives the piston to reciprocate within the piston cylinder. The piston cylinder is divided into a first chamber and a second chamber by the piston. The first chamber is connected to the water inlet pipe and the water outlet pipe, respectively. The second chamber is connected to the air inlet pipe and the air outlet pipe, respectively. When the piston moves in a single stroke, the water inlet valve and the air outlet valve open simultaneously to allow water to enter and air to exit, or the water outlet valve and the air inlet valve open simultaneously to allow air to enter and water to exit. When the piston reciprocates, water and air are delivered to the mixing channel at equal frequencies and pressures. The water flow from the mixing channel is dispersed in a pulsed manner.

[0012] Preferably, the mixing conduit is located at the front end, the power unit at the rear end, and the first and second chambers are located between the front and rear ends, with one of the first and second chambers in front and the other in the rear. Here, the positions of the first and second chambers can be interchanged to provide different flushing dispersion pressures and frequencies.

[0013] Furthermore, the first chamber is a water chamber, and the second chamber is an air chamber. The pressure formed by the water chamber and the air chamber is adjusted according to the water flow rate, the air flow rate, and the volume ratio of the water chamber and the air chamber. Here, the volume ratio and flow rate are used to meet the needs of different operating conditions.

[0014] According to a specific embodiment and preferred aspect of the present invention, the gas discharged from the vent pipe can block the water flow between the outlet pipe and the mixing pipe, wherein the gas and water flow are mixed in the mixing channel, and the gas diffuses to form a dispersed water flow under the impact of the pulsed water flow. This structural layout overcomes the defects of uneven pressure and different frequencies of dispersed water flow caused by the simultaneous supply of water and gas in conventional water-gas mixing.

[0015] In some specific embodiments, the mixing pipeline includes a mixing pipe with a mixing channel and a cap fitted onto the front end of the mixing pipe. The cap has a front pipe hole communicating with the mixing channel, and the rear end of the cap is spaced apart from the rear end of the mixing pipe to form a rear pipe hole. The inner diameter of the front pipe hole is smaller than the inner diameter of the rear pipe hole, and the outlet pipe communicates with the rear pipe hole. Simultaneously, the length of the rear pipe hole is smaller than its diameter, and the diameter of the outlet pipe is 1 / 3 to 4 / 5 of the length of the rear pipe hole; typically, the diameter of the outlet pipe is approximately 1 / 2 of the length of the rear pipe hole. With this structure and the defined length-to-diameter parameters, the water flow can be effectively blocked, ensuring that the gas can mix with the water flow, and under the unconstrained state of the front pipe hole, the gas disperses the water flow.

[0016] According to another specific embodiment and preferred aspect of the present invention, the first cavity is located at the front end, and both ends of the outlet pipe are respectively connected to the first cavity and the mixing pipeline, with an outlet valve installed on the outlet pipe; the inlet pipe is connected to the first cavity through an inlet valve, and during piston movement, the pressure within the first cavity changes, with one valve in an open state and the other in a closed state. With this inlet and outlet valve configuration, the reciprocating motion of the piston enables simultaneous water intake and drainage, maintaining a constant drainage volume and frequency, and ensuring balanced drainage pressure.

[0017] In some specific embodiments, the centerlines of the second chamber, the first chamber, the outlet pipe, and the mixing channel coincide. This structural layout allows for better control of the frequency and pressure of the pulsed water flow. Furthermore, the inlet pipe is connected to a branch of the outlet pipe, which not only facilitates component assembly but also makes water flow control more convenient.

[0018] Preferably, both the inlet valve and the outlet valve close their respective inlets and outlets via elastic elements. The direction of the elastic force generated by these elastic elements is opposite to the direction of water flow, and the two elastic elements are perpendicularly positioned. When the first cavity is under negative pressure, the elastic element of the inlet valve experiences a force in the opposite direction to the negative pressure, and as the negative pressure gradually increases, the elastic element of the inlet valve compresses to open the inlet. The elastic element of the outlet valve experiences a force in the same direction as the negative pressure, and the outlet is closed. When the first cavity is under positive pressure, the elastic element of the outlet valve experiences a force in the opposite direction to the positive pressure, and as the positive pressure gradually increases, the elastic element of the outlet valve compresses to open the outlet. The elastic element of the inlet valve experiences a force in the same direction as the positive pressure, and the inlet is closed. With this elastic element, the inlet and outlet valves are similar to one-way valves. However, the difference is that the elastic force formed by the elastic element is limited. As long as the external force changes and deforms it, the inlet or outlet can be opened. In other words, by replacing different elastic elements, the flow rate of water entering and leaving the first chamber can be effectively controlled.

[0019] In some specific embodiments, the exhaust pipe extends along the length of the piston cylinder, and its two ends are respectively connected to the second chamber and the mixing pipeline; the intake pipe is connected to the second chamber, and the intake valve and exhaust valve are in a closed state due to pressure changes in the second chamber during piston movement. With this intake and exhaust valve structure, synchronous intake and exhaust can be achieved through the reciprocating motion of the piston, resulting in a constant exhaust volume and frequency, as well as balanced exhaust pressure.

[0020] Preferably, the airflow direction discharged from the outlet pipe is perpendicular to the water flow direction. Here, by having the water and air mixing directions perpendicular, it is more conducive to the gas blocking the water flow, thereby forming the required pulse frequency and pressure.

[0021] In some specific embodiments, both the inlet valve and the outlet valve are closed by springs. The two springs are arranged in parallel, and the elastic forces they generate are opposite. When the second cavity is under negative pressure, the spring of the inlet valve experiences force in the opposite direction to the negative pressure, and as the negative pressure gradually increases, the spring of the inlet valve compresses to open the inlet. The spring of the outlet valve experiences force in the same direction as the negative pressure, and the outlet is closed. When the second cavity is under positive pressure, the spring of the outlet valve experiences force in the opposite direction to the positive pressure, and as the positive pressure gradually increases, the spring of the outlet valve compresses to open the outlet. The spring of the inlet valve experiences force in the same direction as the positive pressure, and the inlet is closed. With this spring configuration, the inlet and outlet valves are similar to one-way valves. However, unlike one-way valves, the elastic force generated by the springs is limited. As long as an external force changes and deforms the spring, the inlet or outlet can be opened. In other words, by changing different springs, the flow rate of gas entering and exiting the second cavity can be effectively controlled.

[0022] Furthermore, the piston includes a piston body and a piston head disposed at the front end of the piston body. The piston body is slidably and sealed within the piston cylinder by a sealing ring. The piston head forms an annular protrusion from the circumferential direction, and the annular protrusion is sealed and fitted against the inner wall of the piston cylinder. Here, the piston head effectively adjusts the cavity ratio and further improves the sealing performance between the piston and the piston cylinder.

[0023] Furthermore, the front end of the plug extends forward from the middle to form a protruding portion, wherein an inwardly recessed annular groove is formed between the protruding portion and the circumferential portion of the front end of the plug, and the width of the annular groove gradually decreases from the outside to the inside. Here, by setting the annular groove, on the one hand, the water flow can be relatively converged when the plug moves forward, increasing the pressure output; on the other hand, it can keep the circumferential portion from opening the inner wall of the sealing piston cylinder when moving forward.

[0024] In some specific embodiments, the piston extends out of the piston cylinder via a connecting rod, where the movement of the connecting rod drives the reciprocating motion of the piston. While the movement of the piston and connecting rod is conventional, this application employs a clever layout that not only provides a stable driving effect but also results in a simple structure and low cost.

[0025] Specifically, the system employs a drive motor, a drive gear coaxially connected to the output shaft of the drive motor, a transmission gear perpendicular to the output shaft and meshing with the drive gear, an eccentric wheel synchronously connected to the transmission gear, and a sleeve fitted around the outer circumference of the eccentric wheel. The sleeve is connected to the end of the connecting rod, and during the rotation of the eccentric wheel, the sleeve is pushed forward or backward to drive the connecting rod to move, i.e., to drive the piston to reciprocate.

[0026] Another technical solution of the present invention: a water flosser, comprising the above-mentioned water-air mixing system and a nozzle installed at the outlet of the mixing pipeline, wherein the water jet from the nozzle is pulsed and dispersed at equal frequency and pressure.

[0027] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0028] Existing water-air mixing systems cannot mix water and air simultaneously in the mixing channel, nor can they form a pulsed, dispersed water flow with equal frequency and pressure. This application, however, cleverly solves these shortcomings by integrating the structure of the power unit, water flow, and air flow. This system, through the reciprocating motion of the piston, simultaneously performs air intake and drainage, as well as water intake and exhaust, while switching at equal frequencies. This ensures that water and air are delivered to the mixing channel at equal frequencies and pressures. The water flowing out of the mixing channel is pulsed and dispersed. Therefore, compared to existing structures, under a fixed-frequency, reciprocating motion, it not only forms a pulsed, dispersed water flow with equal frequency and pressure, but also provides a high degree of consistency in the rinsing effect created by the pulses on both sides. This satisfies the requirements for pressure and good rinsing effect needed for dental flossing. Furthermore, the water-air mixing ratio remains constant, and the rinsing amplitude variation between the two pulses is small, resulting in a superior user experience and making it highly suitable for dental flossing. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the water-air mixing system of the present invention;

[0030] Figure 2 for Figure 1 A structural decomposition diagram;

[0031] Figure 3 for Figure 1 Front view diagram;

[0032] Figure 4 for Figure 1 A top-down view;

[0033] Figure 5 for Figure 4 Schematic diagram of the sectional view along the central AA direction;

[0034] Wherein: H, water-air mixing system; 1, water flow pipeline; 10, water inlet pipe; 11, water inlet valve; 12, water outlet pipe; 13, water outlet valve; t, elastic element; 2, gas pipeline; 20, air inlet pipe; 21, air inlet valve; 22, air outlet pipe; 23, air outlet valve; h, spring; 3, mixing pipeline; 3a, mixing pipe; 3b, pipe cap; 30, mixing flow channel; k1, front pipe hole; k2, rear pipe hole; 4, power unit; 40, piston cylinder; q1, first chamber; q2, second chamber; 41, piston; 410, plug body; 411, plug head; a, annular protrusion; b, forward protrusion; c, circumferential part; d, annular groove; 42, power unit; 420, connecting rod; 421, drive motor; 422, drive gear; 423, transmission gear; 424, eccentric wheel; 425, wheel sleeve. Detailed Implementation

[0035] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0041] like Figures 1 to 5 As shown, the water flosser of this embodiment includes a water-air mixing system H and a nozzle detachably connected to the outlet of the water-air mixing system H, wherein the water jet from the nozzle can be dispersed and sprayed out in a pulsed manner with equal frequency and pressure.

[0042] Specifically, the water-air mixing system H includes a water flow pipeline 1, a gas pipeline 2, a mixing pipeline 3, and a power unit 4. The water flow pipeline 1 includes an inlet pipe 10, an inlet valve 11, an outlet pipe 12, and an outlet valve 13. The gas pipeline 2 includes an inlet pipe 20, an inlet valve 21, an outlet pipe 22, and an outlet valve 23. A mixing channel 30 is formed inside the mixing pipeline 3. The power unit 4 includes a piston cylinder 40, a piston 41, and a power component 42 that drives the piston 41 to reciprocate within the piston chamber formed by the piston cylinder 40. The piston chamber is divided into a first chamber q1 and a second chamber q2 by the piston 41.

[0043] In this example, the mixing pipeline 3 is at the front end, the power component 42 is at the rear end, the first cavity q1 is the water cavity, and the second cavity q2 is the air cavity. The water cavity is located at the front end, and the air cavity is located at the rear end. The center lines of the second cavity q2, the first cavity q1, the outlet pipe 12, and the mixing channel 30 are aligned. The first cavity q1 is connected to both the inlet pipe 10 and the outlet pipe 12. That is, both ends of the outlet pipe 12 are connected to the first cavity q1 and the mixing pipeline 3, respectively. The outlet valve 13 is installed on the outlet pipe 12. The water inlet pipe 10 is connected to the first cavity q1 through the water inlet valve 11 (in some specific embodiments, the water inlet pipe 10 can also be connected to a branch of the water outlet pipe 12, thus realizing the connection between the water inlet pipe 10 and the first cavity q1); the second cavity q2 is connected to the air inlet pipe 20 and the air outlet pipe 22 respectively, that is, the air outlet pipe 22 extends along the length direction of the piston cylinder 40, and its two ends are connected to the second cavity q2 and the mixing pipeline 3 respectively; the air inlet pipe 20 is connected to the second cavity q2 through the air inlet valve 12.

[0044] Specifically, both the inlet valve 11 and the outlet valve 13 close their respective inlets and outlets via elastic elements t. The direction of the elastic force generated by the elastic elements t is opposite to the direction of water flow, and the two elastic elements t are arranged perpendicularly to each other (in some specific embodiments, the elastic elements t of the inlet valve 11 are arranged vertically and elastically abut against the valve core outward; the elastic elements t of the outlet valve 13 are arranged front to back and elastically abut against the valve core inward). Both the air inlet valve 21 and the air outlet valve 23 close their respective air inlets and outlets via springs h. The two springs h are arranged parallel (in some specific embodiments, the springs h of the air inlet valve 21 are arranged vertically and elastically abut against the valve core outward; the springs h of the air outlet valve 23 are arranged vertically and elastically abut against the valve core inward), and the direction of the elastic force generated is opposite to the direction of airflow. When the piston moves, the pressure in the first chamber q1 and the second chamber q2 changes, with one chamber being positive and the other negative. In short, when the first chamber q1 is under negative pressure, the elastic element t of the inlet valve 11 experiences a force in the opposite direction to the negative pressure, and as the negative pressure gradually increases, the elastic element t of the inlet valve 11 compresses to open the inlet. The elastic element t of the outlet valve 13 experiences a force in the same direction as the negative pressure, and the outlet closes. Simultaneously, when the second chamber q2 is under positive pressure, the spring h of the vent valve 23 experiences a force in the opposite direction to the positive pressure, and as the positive pressure gradually increases, the spring h of the vent valve 23 compresses to open the vent. The spring h of the inlet valve 21 experiences a force in the same direction as the positive pressure, and the inlet closes. Conversely, when the first chamber q1 is under positive pressure, the elastic element t of the outlet valve 13 experiences a force in the opposite direction to the positive pressure. As the positive pressure gradually increases, the elastic element t of the outlet valve 13 is compressed to open the outlet, and the elastic element t of the inlet valve 11 is in the same direction as the positive pressure, so the inlet is closed. When the second cavity q2 is under negative pressure, the spring h of the air inlet valve 23 is in the opposite direction to the negative pressure, and as the negative pressure gradually increases, the spring h of the air inlet valve 21 is compressed to open the air inlet, and the spring h of the air outlet valve 23 is in the same direction as the negative pressure, so the air outlet is closed. Therefore, as can be seen from the above, when the piston 41 moves in a single stroke, the inlet valve 11 and the air outlet valve 23 open synchronously to draw in water and exhaust air, or the outlet valve 13 and the air inlet valve 21 open synchronously to draw in air and drain water. That is, in the reciprocating motion of the piston 41, water and air are transmitted to the mixing channel 30 at equal frequencies and pressures, and the water flow from the mixing channel 30 is dispersed in a pulsed manner.

[0045] In some specific embodiments, the pressure formed by the water chamber and the air chamber is adjusted according to the water flow rate and the air flow rate, as well as the volume ratio formed by the water chamber and the air chamber. Simultaneously, the gas discharged from the air outlet pipe 22 can block the water flow between the water outlet pipe 12 and the mixing pipe 3. The airflow direction discharged from the air outlet pipe 22 is perpendicular to the water flow direction. Therefore, the gas and water flow mix in the mixing channel, and the gas diffuses during the impact of the pulsed water flow to form a dispersed water flow. Furthermore, the air inlet pipe 20 extends vertically, and the air passages formed by the air inlet pipe 20 and the air outlet pipe 22 are aligned vertically, facilitating assembly. The switching motion of the two sets of valve cores ensures that the inlet and outlet air flow rates are relatively stable and equal, i.e., it can provide balanced air pressure and a constant water-air mixing ratio. However, the setting of the water-air mixing ratio mainly considers the following factors: 1. Water flow rate and air flow rate (the amount entering and exiting the chambers in this context); 2. Adjustment of the volume ratio formed by the water chamber and the air chamber. Of course, the positions of the first and second chambers can also be directly interchanged to provide different flushing dispersion pressures and frequencies.

[0046] In some specific embodiments, the mixing pipeline 3 includes a mixing pipe 3a having a mixing channel 30 and a cap 3b fitted onto the front end of the mixing pipe 3a. The cap 3b has a front pipe hole k1 communicating with the mixing channel 30, and its rear end is spaced apart from the rear end of the mixing pipe 3a to form a rear pipe hole k2 (i.e., the mixing channel 30 is formed by the interconnection of the front pipe hole k1 and the rear pipe hole k2). The inner diameter of the front pipe hole k1 is smaller than the inner diameter of the rear pipe hole k2, and the vent pipe 22 communicates with the rear pipe hole k2. Simultaneously, the length of the rear pipe hole k2 is less than its diameter, and the diameter of the vent pipe 22 is 1 / 3 to 4 / 5 of the length of the rear pipe hole k2. Generally, the diameter of the vent pipe 22 is approximately 1 / 2 of the length of the rear pipe hole k2.

[0047] Furthermore, although the piston 41 is a conventional design, in some specific embodiments, considering structural layout and ease of implementation, the piston 41 includes a piston body 410 and a piston head 411 disposed at the front end of the piston body 410. The piston body 410 is slidably sealed in the piston cylinder 40 by a sealing ring m. The piston head 411 forms an annular protrusion a from the circumferential direction, wherein the annular protrusion a is sealed and fitted against the inner wall of the piston cylinder. The front end of the piston head 411 extends forward from the middle to form a protruding part b, wherein the protruding part b and the circumferential part c of the front end of the piston head form an inwardly recessed annular groove d, and the groove width formed by the annular groove d gradually decreases from the outside to the inside. The piston 41 extends out of the piston cylinder 40 via the connecting rod 420. The movement of the connecting rod 420 drives the reciprocating motion of the piston 41. In some specific embodiments, the power component 42 includes the connecting rod 420, the drive motor 421, the drive gear 422 coaxially connected to the output shaft of the drive motor 421, the transmission gear 423 perpendicular to the output shaft and meshing with the drive gear 422, the eccentric wheel 424 synchronously connected to the transmission gear 423, and the sleeve 425 sleeved on the outer circumference of the eccentric wheel 424. The sleeve 425 is connected to the end of the connecting rod 420, and the rotation of the eccentric wheel 424 pushes the sleeve 425 forward or backward to drive the connecting rod 420 to move, that is, to drive the piston 41 to reciprocate.

[0048] As can be seen from the above, the water flosser assembled using this system, through the reciprocating motion of the piston, simultaneously performs air intake and drainage, as well as water intake and exhaust, while switching at the same frequency. This ensures that water and air are delivered to the mixing channel at equal frequencies and pressures. The water flow from the mixing channel is pulsed and dispersed. Therefore, compared with existing structures, firstly, under the power of a fixed frequency and reciprocating motion, it can not only form a pulsed and dispersed water flow with equal frequency and pressure, but also the rinsing effect formed by the pulses on both sides has a high degree of consistency. That is, it meets the usage requirements of water flossing, such as pressure and good rinsing effect, and the pressure formed is stable with little change in rinsing amplitude between the two pulses. Secondly, the water-air mixing ratio remains constant and can be adjusted according to actual needs to meet the needs of different operating conditions. Thirdly, by making full use of the piston's motion to simultaneously perform water intake and exhaust or air intake and drainage, the pressure of drainage and exhaust is relatively balanced, increasing the user's experience.

[0049] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A water-air mixing system, characterized by, It comprises: a water flow pipeline comprising a water inlet pipe, a water inlet valve, a water outlet pipe, a water outlet valve; a gas pipeline comprising a gas inlet pipe, a gas inlet valve, a gas outlet pipe, a gas outlet valve; a mixing pipeline, inside which a mixing flow channel is formed, and which is in communication with the water outlet pipe and the gas outlet pipe respectively; a power device comprising a piston cylinder, a piston, and a power member for driving the piston to reciprocate in the piston cylinder, wherein a piston cavity formed by the piston cylinder is divided into a first cavity and a second cavity by the piston, the first cavity is in communication with the water inlet pipe and the water outlet pipe respectively, the second cavity is in communication with the gas inlet pipe and the gas outlet pipe respectively, when the piston is displaced in one stroke, the water inlet valve and the gas outlet valve are synchronously opened to allow water to flow in and gas to flow out, or the water outlet valve and the gas inlet valve are synchronously opened to allow gas to flow in and water to flow out; when the piston reciprocates, water and gas are transmitted to the mixing flow channel at the same frequency and pressure in sequence, and the water flow flowing out of the mixing flow channel is in a pulse type dispersion; the gas discharged from the gas outlet pipe can block the water flow between the water outlet pipe and the mixing pipeline, wherein the gas and the water flow are mixed in the mixing flow channel, and the gas diffuses to form a dispersed water flow under the impact of the pulse type water flow; the mixing pipeline comprises a mixing pipe having the mixing flow channel, and a pipe cap sleeved on the front end of the mixing pipe, wherein a front pipe hole in communication with the mixing flow channel is formed inside the pipe cap, and the rear end of the pipe cap is separated from the rear part of the mixing pipe to form a rear pipe hole, the inner diameter of the front pipe hole is smaller than the inner diameter of the rear pipe hole, the gas outlet pipe is in communication with the rear pipe hole, and the length of the rear pipe hole is smaller than the diameter, and the pipe diameter of the gas outlet pipe is 1 / 3-4 / 5 of the length of the rear pipe hole.

2. The water-gas mixing system of claim 1, wherein The mixing pipeline is located at the front end, the power member is located at the rear end, the first cavity and the second cavity are located between the front end and the rear end, and one of the first cavity and the second cavity is in front and the other is in back.

3. The water-gas mixing system of claim 2, wherein, The first cavity is a water cavity, the second cavity is a gas cavity, and the pressures formed by the water cavity and the gas cavity are adjusted and set according to the water flow and the gas flow, and the volume ratio of the water cavity to the gas cavity.

4. The water-gas mixing system of claim 1, wherein The first cavity is located at the front end, the two ends of the water outlet pipe are in communication with the first cavity and the mixing pipeline respectively, and the water outlet valve is installed on the water outlet pipe; the water inlet pipe is in communication with the first cavity through the water inlet valve, and the pressure in the first cavity changes during the movement of the piston, one of the water outlet valve and the water inlet valve is in an open state, and the other is in a closed state.

5. The water-gas mixing system of claim 4, wherein, The center lines of the second cavity, the first cavity, the water outlet pipe, and the mixing flow channel coincide.

6. The water-gas mixing system of claim 4, wherein The water inlet pipe is connected to a branch of the water outlet pipe.

7. The water-gas mixing system according to claim 5 or 6, characterized in that, The water inlet valve and the water outlet valve are closed by elastic members, wherein the directions of the elastic forces formed by the elastic members are opposite to the directions of water flow, and the two elastic members are arranged perpendicularly to each other, when the first cavity is under negative pressure, the force direction of the elastic member of the water inlet valve is opposite to the direction of the negative pressure, and as the negative pressure gradually increases, the elastic member of the water inlet valve is compressed to open the water inlet, the force direction of the elastic member of the water outlet valve is the same as the direction of the negative pressure, and the water outlet is closed; when the first cavity is under positive pressure, the force direction of the elastic member of the water outlet valve is opposite to the direction of the positive pressure, and as the positive pressure gradually increases, the elastic member of the water outlet valve is compressed to open the water outlet, the force direction of the elastic member of the water inlet valve is the same as the direction of the positive pressure, and the water inlet is closed.

8. The water-gas mixing system of claim 7, wherein, The air outlet pipe extends along the length direction of the piston cylinder, and two ends thereof are respectively communicated with the second cavity and the mixing pipe; the air inlet pipe is communicated with the second cavity, and the air inlet valve and the air outlet valve are in the piston movement, and the pressure in the second cavity changes, one of the air inlet valve and the air outlet valve is in the open state, and the other is in the closed state.

9. The water gas mixing system of claim 8, wherein, The air flow direction of the air outlet pipe is arranged perpendicularly to the water flow direction.

10. The water-gas mixing system of claim 8, wherein, The air inlet valve and the air outlet valve are closed by springs, wherein the two springs are arranged in parallel, and the directions of the elastic forces formed by the springs are opposite to the direction of air flow, when the second cavity is under negative pressure, the force direction of the spring of the air inlet valve is opposite to the direction of the negative pressure, and as the negative pressure gradually increases, the spring of the air inlet valve is compressed to open the air inlet, the force direction of the spring of the air outlet valve is the same as the direction of the negative pressure, and the air outlet is closed; when the second cavity is under positive pressure, the force direction of the spring of the air outlet valve is opposite to the direction of the positive pressure, and as the positive pressure gradually increases, the spring of the air outlet valve is compressed to open the air outlet, the force direction of the spring of the air inlet valve is the same as the direction of the positive pressure, and the air inlet is closed.

11. An oral irrigator characterized by: It comprises the water-air mixing system according to any one of claims 1 to 10, and a nozzle installed at the outlet of the mixing pipe, wherein the water flow sprayed from the nozzle is pulsed and dispersed in equal frequency and equal pressure.

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