Water pumping structure and water pick

Abstract

The utility model provides a water pumping structure and a water pick, and the water pumping structure comprises a pump body which is internally provided with a cavity; the pump head is arranged in the cavity, the first axial end of the pump head is open, the second axial end of the pump head is closed, the first end of the pump head is fixed to the cavity in a sealed mode, a water storage cavity is defined by the inner wall face of the pump head and the inner wall face of the cavity, the pump head is provided with an elastic telescopic part capable of stretching out and drawing back in the axial direction, and a gap is formed between the elastic telescopic part and the inner circumferential wall of the cavity; and the driving mechanism is connected with the second end of the pump head and is used for driving the second end to do axial reciprocating motion in the cavity. According to the water pumping structure, the first end of the pump head and the pump body are fixed and are in sealing fit, and the sealing performance of the pump body is improved; when the second end of the pump head axially reciprocates, the elastic telescopic part of the pump head elastically deforms to realize the suction action of liquid, and the elastic telescopic part is not in contact with the inner peripheral wall of the cavity, so that the frictional resistance can be reduced, the abrasion can be reduced, the noise can be reduced, and the service lives of the water pumping structure and the corresponding oral irrigator can be prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of oral cleaning, and more specifically, relates to a water pumping structure and a dental irrigator. Background Art

[0002] With people paying more and more attention to oral hygiene, the cleaning and care of the oral cavity have also received increasing attention. As an oral cleaning appliance, a dental irrigator can achieve oral cleaning by using the impact force of a high-speed water column ejected under a certain pressure, and has gradually become an essential item for many families. In the existing dental irrigator, after long-term use, the internal pump body of its movement mechanism will cause the loss of lubricating grease, large load current, high noise during operation, unstable water pressure, and serious heat generation, thereby affecting the service life of the entire movement mechanism. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide a water pumping structure and a dental irrigator with low noise and long service life.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a water pumping structure, including:

[0005] A pump body with a cavity inside, and the pump body is provided with a water inlet and a water outlet communicating with the cavity;

[0006] A pump head disposed in the cavity, with the first end of the pump head axially open and the second end axially closed. The first end of the pump head is sealed and fixed to the cavity. The inner wall surface of the pump head and the inner wall surface of the cavity enclose a water storage cavity. Both the water inlet and the water outlet communicate with the water storage cavity. The pump head has an elastic telescopic part that can axially expand and contract, and there is a gap between the elastic telescopic part and the inner peripheral wall of the cavity;

[0007] A driving mechanism, connected to the second end of the pump head, for driving the second end to perform an axial reciprocating motion in the cavity, so that the elastic telescopic part generates elastic deformation, thereby changing the pressure in the water storage cavity.

[0008] In one embodiment, the elastic telescopic part is a corrugated section, and the corrugated section has at least two wave peaks bending outward and at least two wave valleys bending inward, and the wave peaks and wave valleys are connected in sequence.

[0009] In one embodiment, the water pumping structure further includes a sleeve, at least a part of the sleeve is embedded in the pump body, the first end of the pump head is pressed between the sleeve and the pump body, at least a part of the elastic telescopic part is received in the sleeve, and there is a gap between the elastic telescopic part and the inner peripheral wall of the sleeve.

[0010] In one embodiment, the pump head includes a collar and a telescopic sleeve. The telescopic sleeve is pressed between the sleeve and the cavity. The elastic telescopic portion is formed on the telescopic sleeve. One end of the telescopic sleeve is connected to the inner wall surface of the collar, and the other end of the telescopic sleeve extends out of the collar and is connected to the driving mechanism.

[0011] In one embodiment, one end of the telescopic sleeve extends outward to form a connecting portion, and the outer peripheral edge of the connecting portion is connected to the inner peripheral wall of the collar.

[0012] In one embodiment, a convex ring extends axially in the cavity. A first annular groove is formed between the outer peripheral wall of the convex ring and the inner peripheral wall of the cavity. The sleeve includes a large-diameter section and a small-diameter section arranged coaxially. The diameter of the large-diameter section is greater than that of the small-diameter section. A second annular groove is formed between the outer peripheral wall of the small-diameter section and the inner peripheral wall of the pump body. One end of the collar is clamped in the first annular groove, and the other end of the collar is clamped in the second annular groove. The connecting portion is pressed between the convex ring and the small-diameter section.

[0013] A water flosser includes the above-mentioned water pumping structure.

[0014] In one embodiment, the driving mechanism includes a motor and a transmission assembly. The transmission assembly includes a bevel gear, a crown gear, and a swing rod. The bevel gear is fixed on the output shaft of the motor. The crown gear meshes with the bevel gear. An eccentric platform is eccentrically arranged on the end face of one side of the crown gear. One end of the swing rod is connected to the second end of the pump head, and the eccentric platform is rotatably connected to the other end of the swing rod. The water flosser further includes a housing. At least one circle of convex ribs protrude from the inner wall surface of the housing. The end face of the crown gear without teeth is in contact with the convex ribs.

[0015] In one embodiment, the surface of the convex rib in contact with the crown gear is an arc surface.

[0016] In one embodiment, a connecting head is provided at the second end of the pump head. The connecting head is provided with an axially open blind groove. The blind groove includes a first groove and a second groove that are connected and communicate with each other. The inner diameter of the first groove is greater than that of the second groove. The swing rod is provided with an axially spaced first convex ring and a second convex ring. The first convex ring is located at the end of the swing rod. The diameter of the first convex ring is smaller than that of the second convex ring. The size of the first convex ring is adapted to the first groove. The first convex ring is inserted into the first groove, and the second convex ring abuts against the end face of the connecting head. The peripheral edge of the end of the first convex ring is set to have a smooth transition so as to be inserted into the first groove from the second groove.

[0017] The beneficial effects of the water pumping structure provided by this application are as follows: Compared with the prior art, in the water pumping structure of this application, a pump head is provided inside the pump head. The first end of the pump head is fixed to the pump body and forms a sealed fit, thereby improving the sealing performance of the pump body and ensuring stable water pressure during operation. The pump head is provided with an elastic telescopic part that can axially expand and contract. When the driving mechanism drives the second end of the pump head to move axially back and forth, the elastic telescopic part of the pump head undergoes elastic deformation, thereby changing the pressure in the water storage cavity and realizing the suction action of the liquid. The elastic telescopic part does not contact the inner peripheral wall of the cavity, which can reduce the frictional resistance, slow down wear, reduce noise, and extend the service life of the water pumping structure and the corresponding oral irrigator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Is a perspective view of the water pumping structure provided by the embodiment of this application;

[0020] Figure 2 Is Figure 1 An exploded view of the water pumping structure shown;

[0021] Figure 3 Is Figure 1 A cross-sectional view of the water pumping structure shown, where the elastic telescopic part is in the extended state;

[0022] Figure 4 Is Figure 1 A perspective cross-sectional view of the water pumping structure shown;

[0023] Figure 5 Is Figure 1 A partial cross-sectional view of the water pumping structure shown, where the elastic telescopic part is in the extended state;

[0024] Figure 6 Is Figure 1 A partial cross-sectional view of the water pumping structure shown, where the elastic telescopic part is in the compressed state;

[0025] Figure 7 Is Figure 1 A perspective view of the pump head in the water pumping structure shown, where the elastic telescopic part is in the extended state;

[0026] Figure 8 Is Figure 7 A cross-sectional view of the pump head in

[0027] Figure 9 Is a perspective view of the oral irrigator provided by the embodiment of this application;

[0028] Figure 10 is Figure 9 a side view of the oral irrigator shown;

[0029] Figure 11 is a sectional view taken along the Figure 10 AA direction in;

[0030] Figure 12 is Figure 9 an exploded view of the oral irrigator shown;

[0031] Figure 13 is a sectional view of the pump head in the pump water structure provided by another embodiment of the present application;

[0032] Figure 14 is a sectional view of the pump head in the pump water structure provided by yet another embodiment of the present application.

[0033] Among them, each reference numeral in the figure:

[0034] 10 - pump water structure; 20 - pump body; 30 - pump head; 40 - drive mechanism; 50 - sleeve; 11 - outer shell; 12 - face shell; 13 - bottom shell; 120 - rib; 21 - cavity; 201 - water storage cavity; 202 - water inlet; 203 - water inlet joint; 204 - water outlet; 205 - first one - way valve; 206 - second one - way valve; 210 - convex ring; 211 - first annular groove; 310 - elastic telescopic part; 311 - wave crest; 312 - wave trough; 320 - collar; 330 - telescopic sleeve; 321 - sealing rib; 331 - connecting part; 332 - connecting head; 3320 - blind groove; 3321 - first groove; 3322 - second groove; 3323 - positioning projection; 41 - motor; 42 - bevel gear; 43 - crown gear; 44 - swing rod; 430 - eccentric platform; 401 - connecting cavity; 402 - strip - shaped hole; 441 - first convex ring; 442 - second convex ring; 4420 - positioning block; 4421 - positioning groove; 443 - connecting shaft; 51 - large - diameter section; 52 - small - diameter section; 53 - second annular groove; 54 - third annular groove. Detailed implementation manners

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the following further describes the present application in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0039] Please refer to Figures 1 to 3 , and now the pump water structure 10 provided by the embodiment of the present application will be described. The pump water structure 10 includes a pump body 20, a pump head 30, and a driving mechanism 40. The interior of the pump body 20 has a cavity 21. One end of the pump body 20 is provided with a water inlet 202 and a water outlet 204 that communicate with the cavity 21. The water inlet 202 is used to install a water inlet joint, and the water outlet 204 is used to install a water outlet joint. The pump head 30 is disposed in the cavity 21 of the pump body 20. The pump head 30 is elastic and can be but is not limited to being made of a plastic part. The pump head 30 has an axial first end and a second end. The first end is open, and the second end is closed. The first end of the pump head 30 is hermetically fixed in the cavity 21, and can be specifically directly connected to the pump body 20 or indirectly fixed to the pump body 20, and forms a sealed fit with the cavity 21.

[0040] Refer to Figures 4 to 6 , the inner wall surface of the pump head 30 and the inner wall surface of the cavity 21 enclose a water storage cavity 21. The inner diameter of the head of the water storage cavity 21 is smaller at one end and larger at the other end. Both the water inlet 202 and the water outlet 204 are connected and communicate with the smaller-diameter head of the water storage cavity 21. The water inlet 202 is opened on the radial side of the head, and the water outlet 204 is opened on the axial side of the head.

[0041] The pump head 30 has an elastic telescopic part 310 that can axially expand and contract, and there is a gap between the elastic telescopic part 310 and the inner peripheral wall of the cavity 21. The driving mechanism 40 is connected to the second end of the pump head 30 and is used to drive the second end of the pump head 30 to make an axial reciprocating motion in the cavity 21. In this way, the elastic telescopic part 310 of the pump head 30 generates elastic deformation, and the size of the water storage cavity 21 surrounded is changed, thereby changing the pressure in the water storage cavity 21, so as to realize the pumping and water absorption actions. During the process of the elastic telescopic part 310 generating elastic deformation, its outer peripheral wall does not contact the inner peripheral wall of the cavity 21, and there is a gap between the two. In this way, the elastic telescopic part 310 in the pump head 30 does not contact the cavity 21 in the static state, the stretched state and the compressed state, and no noise will be generated due to frictional contact, greatly reducing the noise generated when the water pumping structure 10 works. The provided pump head 30 can not only reduce the noise during operation, but also eliminate the lubricating grease, reduce the load current, keep the water pressure stable during operation, and improve the service life of the movement.

[0042] For the water pumping structure 10 provided by the present application, compared with the prior art, a pump head 30 is provided inside the pump head 30. The first end of the pump head 30 is fixed to the pump body 20 and forms a sealed fit, thereby improving the sealing performance of the pump body 20 and keeping the water pressure stable during operation; the pump head 30 is provided with an elastic telescopic part 310 that can axially expand and contract. When the driving mechanism 40 drives the second end of the pump head 30 to make an axial reciprocating motion, the elastic telescopic part 310 of the pump head 30 undergoes elastic deformation, thereby changing the pressure in the water storage cavity 21 and realizing the liquid suction action. The elastic telescopic part 310 does not contact the inner peripheral wall of the cavity 21, so that the frictional resistance can be reduced, the wear can be slowed down, the noise can be reduced, and the service life of the water pumping structure 10 and the corresponding oral irrigator can be prolonged.

[0043] Refer to Figure 7 、 Figure 8 The elastic telescopic part 310 is a corrugated section. The corrugated section has at least two wave peaks 311 bent outward and at least two wave valleys 312 bent inward. The wave peaks 311 and wave valleys 312 of the corrugated section are connected in sequence. In this way, the elastic telescopic part 310 forms a multi-layer telescopic structure, which can effectively improve the water outlet effect. The wall surfaces of the wave peaks 311 and wave valleys 312 of the corrugated section are both smooth structures. In this embodiment, the corrugated section has two wave peaks 311 and two wave valleys 312. In this way, the elastic telescopic part 310 forms a double-layer telescopic structure, which has a simple structure and a better water outlet effect. It can be understood that more layers can also be set for the corrugated section, such as setting more wave peaks 311 and wave valleys 31, so that the elastic telescopic part 310 forms a three-layer, four-layer or more-layer telescopic structure; the elastic telescopic part in the pump head can also adopt other structures or fewer wave peaks and wave valleys. Refer to Figure 13 In the pump head 30, the elastic telescopic part 310 does not adopt the wave peak and wave valley structure, and the outer contour dimension of the elastic telescopic part 310 gradually decreases from the open end to the closed end of the pump head 30; Refer toFigure 14 In Figure 14 , the elastic telescopic part 310 in the pump head 30 has a wave crest and a wave trough, wherein the wave trough is close to the open end of the pump head 30, and the wave crest is close to the closed end of the pump head 30.

[0044] Refer to Figure 2 、 Figure 5 、 Figure 6 The water pumping structure 10 further includes a sleeve 50. At least a part of the sleeve 50 is embedded in the pump body 20, and the first end of the pump head 30 is pressed between the sleeve 50 and the pump body 20. That is to say, the sleeve 50 is fixed relative to the pump body 20, and the two can be installed and fixed by interference fit. One end of the sleeve 50 presses the first end of the pump body 20 in the cavity 21 of the pump body 20. One end of the driving mechanism 40 extends into the sleeve 50 and is connected to the second end of the pump head 30. At least a part of the elastic telescopic part 310 of the pump head 30 is received in the sleeve 50. In this embodiment, the sleeve 50 is entirely received in the pump body 20. The elastic telescopic part 310 of the pump head 30 is received in the sleeve 50 both in the extended state and the contracted state, and there is a gap between the outer peripheral wall of the elastic telescopic part 310 of the pump head 30 and the inner peripheral wall of the sleeve 50. In this way, when the elastic telescopic part 310 expands and contracts to generate elastic deformation, it will not contact the inner peripheral wall of the sleeve 50, and the two will not generate friction, thereby avoiding the generation of noise and prolonging the service life of the pump head 30 and the water pumping structure 10.

[0045] Please refer to Figures 5 to 8 The pump head 30 includes a collar 320 and a telescopic sleeve 330, and the collar 320 and the telescopic sleeve 330 can adopt an integrally formed structure. Both axial ends of the collar 320 are open, and the collar 320 is pressed and fixed between the sleeve 50 and the cavity 21 of the pump body 20. A sealing rib 321 protrudes from the outer peripheral wall of the collar 320, and the sealing rib 321 is in sealing contact with the inner peripheral wall of the cavity 21. The elastic telescopic part 310 is formed on the telescopic sleeve 330. One end of the telescopic sleeve 330 is connected to the inner wall surface of the collar 320, and the other end of the telescopic sleeve 330 extends out of the collar 320 and is connected to one end of the driving mechanism 40. That is to say, the sleeve 50 presses the collar 320 in the pump body 20, and the pump head 30 is pressed between the sleeve 50 and the cavity 21 through the collar 320 to realize the relative fixation between the first end and the cavity 21. The installation and fixation are realized among the pump body 20, the collar 320 of the pump head 30 and the sleeve 50. The end of the telescopic sleeve 330 far from the collar 320 is connected to the driving mechanism 40. When the driving mechanism 40 drives the telescopic sleeve 330 to move axially, the elastic telescopic part 310 on the telescopic sleeve 330 generates elastic deformation, thereby changing the pressure in the water storage cavity 21 and realizing the liquid suction action.

[0046] Refer to Figure 2 、 Figure 5 、 Figure 6, a convex ring 210 extends axially in the cavity 21. A first annular groove 211 is defined between the outer peripheral wall of the convex ring 210 and the inner peripheral wall of the cavity 21. The sleeve 50 includes a large-diameter section 51 and a small-diameter section 52 arranged coaxially. The diameter of the large-diameter section 51 is greater than that of the small-diameter section 52. An annular boss is formed on the outer wall surface of the sleeve 50 at the connection between the large-diameter section 51 and the small-diameter section 52. A second annular groove 53 is defined between the outer peripheral wall of the small-diameter section 52 and the inner peripheral wall of the pump body 20. One end of the collar 320 is snapped into the first annular groove 211, and the other end of the collar 320 is snapped into the second annular groove 53. The connecting portion 331 is pressed between the convex ring 210 and the small-diameter section 52. That is to say, the first annular groove 211 and the second annular groove 53 form an installation groove adapted to accommodate the collar 320. The connecting portion 331 on the telescopic sleeve 330 extends out from the gap between the small-diameter section 52 and the convex ring 210, and the connecting portion 331 is pressed between the convex ring 210 and the small-diameter section 52. In this way, a sealing fit is formed at the pressing position of the connecting portion 331 of the pump head 30, and the liquid in the water storage cavity 21 will not flow out between the sleeve 50 and the convex ring 210. A third annular groove 54 is provided on the outer peripheral wall of the large-diameter section 51 of the sleeve 50. One end of the pump body 20 is inserted into the third annular groove 54 and is in interference fit with the third annular groove 54. In this way, the pump body 20 and the sleeve 50 are assembled and fixed. Two positioning walls protrude axially from the groove wall of the third annular groove 54, and a positioning block protrudes from the outer peripheral wall of the pump body 20. A positioning groove adapted to the positioning block is formed between the two positioning walls. In this way, the positioning and assembly between the sleeve 50 and the pump body 20 are realized through the positioning cooperation between the positioning block and the positioning groove.

[0047] Refer to Figures 1 to 4 , the driving mechanism 40 includes a motor 41 and a transmission assembly. The transmission assembly includes a bevel gear 42, a crown gear 43 and a swing rod 44. The bevel gear 42 is fixed on the output shaft of the motor 41. The crown gear 43 meshes with the bevel gear 42. The output shaft of the motor 41 is arranged coaxially with the bevel gear 42 and is perpendicular to the axis of the crown gear 43. An eccentric platform 430 is eccentrically arranged on one end face of the crown gear 43. One end of the swing rod 44 is connected to the second end of the pump head 30, and the eccentric platform 430 is rotatably connected to the other end of the swing rod 44.

[0048] The other end of the swing rod 44 is provided with a connecting cavity 401 adapted to the eccentric platform 430. The eccentric platform 430 is rotatably sleeved in the connecting cavity 401. That is to say, the other end of the swing rod 44 is rotatably connected to the eccentric platform 430 on the crown gear 43 through the connecting cavity 401. In this way, when the crown gear 43 rotates, it drives the eccentric platform 430 to rotate, and then drives the swing rod 44 to move. The connecting cavity 401 and the eccentric platform 430 are in clearance fit. The shape of the connecting cavity 401 is in the shape of a runway, and its width is adapted to the outer diameter of the eccentric platform 430. The opposite ends of the connecting cavity 401 are semicircular and are adapted to the eccentric platform 430. In this way, the eccentric platform 430 can slide back and forth in the connecting cavity 401 and can rotate.

[0049] The output shaft of the motor 41 drives the bevel gear 42 to rotate. The bevel gear 42 drives the crown gear 43 to rotate. The crown gear 43 drives the swing rod 44 to perform reciprocating up and down motion through the eccentric platform 430, and further drives the pump head 30 to perform axial telescopic motion, so as to realize the function of sucking liquid. That is to say, when the motor 41 works, it drives the bevel gear 42 to rotate. The bevel gear 42 drives the crown gear 43 to rotate. The crown gear 43 can convert the circular motion of the crown gear 43 into the non-circular motion of the swing rod 44 through the eccentric platform 430 eccentrically arranged at its tail, so that the rotation of the crown gear 43 can drive the swing rod 44 to move. When the swing rod 44 moves, it will drive the pump head 30 to axially expand and contract. The axial telescopic motion of the pump head 30 forces the pressure in the water storage cavity 21 to change, and further realizes the function of sucking liquid.

[0050] Refer to Figure 2 、 Figure 5 and Figure 6, a first convex ring 441 and a second convex ring 442 are spaced apart at one end of the swing rod 44. The first convex ring 441 is located at the end of the swing rod 44, and the diameter of the first convex ring 441 is smaller than that of the second convex ring 442. The other end of the telescopic sleeve 330 is provided with a connector 332, that is, the second end of the pump head 30 is provided with a connector 332. The connector 332 is detachably connected to the swing rod 44. The connector 332 is provided with a blind groove 3320, and the axial opening is at one end of the blind groove 3320. The blind groove 3320 includes a first groove 3321 and a second groove 3322 that are connected and communicate with each other. The inner diameter of the first groove 3321 is set to be larger than that of the second groove 3322. Both axial ends of the second groove 3322 are open, and the opening of the second groove 3322 away from the first groove 3321 forms an insertion port. The size of the first convex ring 441 is adapted to the first groove 3321, and the first convex ring 441 is inserted into the first groove 3321. The diameter of the second groove 3322 is smaller than that of the first convex ring 441. The inlet of the second groove 3322, that is, the insertion port, is a flared opening with a gradually widening diameter, and the peripheral edge at the end of the first convex ring 441 is smoothly transitioned, so that the first convex ring 441 of the swing rod 44 can be conveniently inserted into the first groove 3321 from the second groove 3322. The settings of the blind groove 3320, the first convex ring 441 and the second convex ring 442 facilitate the rapid assembly between the swing rod 44 and the connector 332, and a relatively stable connection is formed after the two are assembled, and the swing rod 44 is not easily detached from the connector 332. During installation, the first convex ring 441 is aligned with the insertion port, and the first convex ring 441 is inserted into the first groove 3321 of the connector 332 by applying force, while the second convex ring 442 abuts against the end face of the connector 332. A positioning block 4420 is convexly provided on the outer peripheral wall of the second convex ring 442, and a positioning groove 4421 is provided in the positioning block 4420. A matching positioning protrusion 3323 is axially convexly provided on the end face of the connector 332. In this way, through the positioning cooperation between the positioning protrusion 3323 and the positioning groove 4421, a relatively stable assembly is formed between the connector 332 and the swing rod 44.

[0051] Please refer to Figure 1 , Figures 9 to 12 , the oral irrigator provided by the embodiment of the present application includes the water pumping structure 10 described in the above embodiment. The oral irrigator further includes a housing 11, and the pump body 20, the pump head 30 and the driving mechanism 40 of the water pumping structure 10 are all housed in the housing 11. An inlet joint 203 is provided at the water inlet 202 of the pump body 20, and an outlet joint is provided at the water outlet 204. The outlet joint is used to install a nozzle. The outlet joint may be provided with a plugging structure that cooperates with the nozzle, and the two can be connected by a detachable structure, so that the nozzle is convenient to plug in and remove. The axes of the pump body 20 and the motor 41 are both arranged parallel to the length direction of the housing 11, and the axial direction of the crown gear 43 is perpendicular to the length direction of the housing 11. In this way, the overall length of the oral irrigator is smaller, which is convenient for carrying and using, and provides convenience for users.

[0052] Please refer to Figure 2 , Figure 11 and Figure 12 . The crown gear 43 is installed in the housing 11 through the connecting shaft 443. The connecting shaft 443 is coaxially arranged with the crown gear 43. The eccentric table 430 is provided with a through hole for the connecting shaft 443 to pass through. One end face of the connecting cavity 401 is provided with a strip hole 402 whose width is adapted to the connecting shaft 443. The length direction of the strip hole 402 is parallel to the axis direction of the housing 11. The connecting shaft 443 can move up and down along the strip hole 402.

[0053] The housing 11 includes a face shell 12 and a bottom shell 13 which are connected. Connecting columns and connecting holes are provided at corresponding positions of the face shell 12 and the bottom shell 13. The face shell 12 and the bottom shell 13 can be installed and fixed together by screwing through the connecting holes and the corresponding connecting columns. The crown gear 43 can rotate around the connecting shaft 443 in the housing 11. Both ends of the connecting shaft 443 are respectively inserted into the fixing holes provided in the face shell 12 and the bottom shell 13.

[0054] At least one circle of convex ribs 120 is provided on the inner wall surface of the housing 11. The end face of the crown gear 43 without teeth is in contact with the convex ribs 120. The setting of the convex ribs 120 can reduce the contact area between the housing 11 and the crown gear 43, reduce loss and lower noise. In this embodiment, a circle of convex ribs 120 protrudes on the inner wall surface of the bottom shell 13. The convex ribs 120 are coaxially arranged with the crown gear 43. The crown gear 43 is in contact with this circle of convex ribs 120. In this way, an integral circle of balance ribs is formed through the convex ribs 120, which cooperates with the axially telescopic pump head 30 arranged in the pump body 20. When the pump head 30 reciprocates, the overall effects of vibration reduction, noise reduction, reduction of transmission energy loss, increase of inertia and stabilization of water pressure are further improved. At the same time, it can also avoid the phenomenon of gear tooth slipping due to unbalanced force, thereby improving the service life of the entire movement.

[0055] Preferably, the surface of the convex rib 120 in contact with the crown gear 43 is set as an arc surface, so that the contact area between the crown gear 43 and the convex rib 120 can be further reduced, and further reduce the transmission loss and lower the noise.

[0056] Refer to Figure 2 , Figure 5 , Figure 12A thin sheet-shaped first non-return valve 205 is provided at the water inlet 202 of the pump body 20, and a first sealing ring can be provided between the water inlet joint 203 and the pump body 20. A second non-return valve 206 with a pointed end is provided at the water outlet 204 of the pump body 20, and a second sealing ring can be provided between the water outlet joint and the pump body 20, so as to achieve sealing, and the cleaning liquid can only flow in one direction and cannot flow back. Specifically, when the swing rod 44 moves downward, the first one-way valve 205 is in an open state, the second one-way valve 206 is in a closed state, the pressure in the water storage chamber 21 of the pump body 20 is reduced, and the liquid is sucked into the pump body 20; when the swing rod 44 moves upward, the corrugated section of the pump head 30 is in a compressed state, the first one-way valve 205 is under pressure and blocks the water inlet 202, and is in a closed state at this time, the second one-way valve 206 is in an open state, the pressure in the water storage chamber 21 increases, and the sucked liquid is discharged from the water outlet 204 of the pump head 30, so that high-frequency liquid suction and discharge actions can be achieved, so that it can be used to treat tooth decay, wash away dental plaque and food remaining below the gum line.

[0057] A main control board (not shown) is also provided in the housing 11, and the motor 41 is electrically connected to the main control board. The main control board can control the speed of the motor 41, thereby controlling the opening and closing time of the first one-way valve 205 and the second one-way valve 206, so as to adjust the water output and water pressure. Adjustment buttons can be provided at corresponding positions on the housing 11, and the water output and water pressure can be adjusted and switched by pressing the corresponding adjustment buttons to meet the different needs of users. The assembly operation between the various components of the water flosser is convenient and can be assembled quickly.

[0058] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A water pump structure, characterized in that: include: A pump body having a cavity inside, the pump body being provided with a water inlet and a water outlet communicated with the cavity; A pump head is arranged in the cavity, wherein the first axial end of the pump head is open and the second axial end is closed, the first end of the pump head is sealed and fixed to the cavity, the inner wall surface of the pump head and the inner wall surface of the cavity form a water storage cavity, the water inlet and the water outlet are both connected to the water storage cavity, the pump head has an elastic expansion portion that can expand and contract axially, and there is a gap between the elastic expansion portion and the inner peripheral wall of the cavity; The driving mechanism is connected to the second end of the pump head and is used to drive the second end to perform axial reciprocating motion in the cavity, so that the elastic telescopic part produces elastic deformation, thereby changing the pressure in the water storage cavity.

2. The water pump structure according to claim 1, characterized in that: The elastic expansion part is a corrugated section, and the corrugated section has at least two wave crests bent outward and at least two wave troughs bent inward, and the wave crests and the wave troughs are connected in sequence.

3. The water pump structure according to claim 1, characterized in that: The water pumping structure also includes a sleeve, at least a portion of which is embedded in the pump body, the first end of the pump head is pressed between the sleeve and the pump body, at least a portion of the elastic telescopic part is accommodated in the sleeve, and there is a gap between the elastic telescopic part and the inner circumferential wall of the sleeve.

4. The water pump structure according to claim 3, characterized in that: The pump head includes a ring and a telescopic sleeve, the telescopic ring is compressed between the sleeve and the cavity, the elastic telescopic portion is formed on the telescopic sleeve, one end of the telescopic sleeve is connected to the inner wall surface of the ring, and the other end of the telescopic sleeve extends out of the ring and is connected to the driving mechanism.

5. The water pump structure according to claim 4, characterized in that: One end of the telescopic sleeve extends outward to form a connecting portion, and the outer peripheral edge of the connecting portion is connected to the inner peripheral wall of the ring.

6. The water pump structure according to claim 5, characterized in that: A convex ring is formed by axially extending in the cavity, and a first annular groove is formed between the outer circumferential wall of the convex ring and the inner circumferential wall of the cavity; the sleeve includes a large diameter section and a small diameter section arranged coaxially, the diameter of the large diameter section is larger than the diameter of the small diameter section, and a second annular groove is formed between the outer circumferential wall of the small diameter section and the inner circumferential wall of the pump body; one end of the collar is clamped in the first annular groove, and the other end of the collar is clamped in the second annular groove, and the connecting portion is pressed between the convex ring and the small diameter section.

7. A dental flosser, characterized in that: The invention comprises the water pumping structure as described in any one of claims 1 to 6.

8. The oral rinser according to claim 7, characterized in that: The driving mechanism includes a motor and a transmission assembly, and the transmission assembly includes a bevel gear, a crown gear and a rocker arm. The bevel gear is fixed to the output shaft of the motor, and the crown gear is meshed with the bevel gear. An eccentric table is eccentrically arranged on the end face of one side of the crown gear, one end of the rocker arm is connected to the second end of the pump head, and the eccentric table is rotatably connected to the other end of the rocker arm; the water flosser also includes a shell, and the inner wall surface of the shell is convexly provided with at least one circle of ribs, and the end face of the crown gear without gear teeth is in contact with the ribs.

9. The oral rinser according to claim 8, characterized in that: The surface of the convex rib in contact with the crown gear is an arc surface.

10. The oral rinser according to claim 8, characterized in that: The second end of the pump head is provided with a connector, and the connector is provided with an axially open blind groove, and the blind groove includes a first groove and a second groove that are connected and communicated, and the inner diameter of the first groove is larger than the inner diameter of the second groove; the rocker arm is provided with a first convex ring and a second convex ring that are axially spaced, and the first convex ring is located at the end of the rocker arm, and the diameter of the first convex ring is smaller than the diameter of the second convex ring, and the size of the first convex ring is adapted to the first groove, and the first convex ring is inserted into the first groove, and the second convex ring abuts against the end face of the connector; the periphery of the end of the first convex ring is set to be a smooth transition so as to be inserted from the second groove into the first groove.

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