WO2022252245A1

WO2022252245A1 - Water pump of oral irrigator

Info

Publication number: WO2022252245A1
Application number: PCT/CN2021/098651
Authority: WO
Inventors: 唐勇
Original assignee: 重庆耐菲尔科技有限公司
Priority date: 2021-06-02
Filing date: 2021-06-07
Publication date: 2022-12-08
Also published as: CN113217327A

Abstract

A water pump of an oral irrigator, comprising: a pump housing (1) and a transmission mechanism, a sliding cavity (11) being formed in the pump housing (1), a piston (2) being provided inside the sliding cavity (11), the transmission mechanism comprising a transmission member (3), the transmission member (3) being connected to a drive mechanism, and a limiting shaft (7) and an eccentric shaft (32) being connected to the transmission member (3); and a transmission connecting rod (8) provided with a first rod end (81) and a second rod end (82), the first rod end (81) being connected to the piston (2), and the second rod end (82) being provided with a movable groove (821) which can allow the eccentric shaft (32) to be inserted in and a limiting groove (822) which can allow the limiting shaft (7) to be inserted in. The arrangement path of the limiting groove (822) is a straight line, and the limiting groove (822) is arranged along the movement direction of the piston. The arrangement path of the movable groove (821) is a convex closed curve, and the closed curve is in a central symmetric shape of which the length is larger than the width. The length direction of the closed curve is perpendicular to the arrangement path of the limiting groove (822), such that the jitter of the transmission connecting rod (8) can be greatly reduced, thereby reducing the noise, and improving the coaxiality of the axis of the piston (2) and the axis of a piston cylinder.

Description

Water pump for dental flosser

technical field

The invention relates to the technical field of dental flossers, in particular to a dental flosser water pump.

Background technique

Between the piston of the dental water pump and the rotating shaft of the motor, a transmission mechanism is needed to convert the rotary motion of the rotating shaft into the linear reciprocating motion of the piston. The current transmission mechanism includes a worm gear structure, an eccentric wheel, and a transmission connecting rod. Specifically, the worm gear structure includes a drive worm connected to the rotating shaft and a drive worm meshed with the drive worm, the central axis of the drive worm coincides with the central axis of the rotating shaft, and the drive link has a first rod end and a second rod end, The first rod end is connected with the piston of the water pump, and the second rod end is connected with the transmission worm gear through the eccentric wheel. The central axes of the eccentric wheels of the transmission worm are parallel and misaligned with each other, so that during use, the first rod end can only reciprocate along a preset linear path, while the second rod end rotates around the central axis of the transmission worm wheel , that is, if the movement modes of the first rod end and the second rod end are inconsistent, the movement of the transmission connecting rod is more complicated, and it is prone to jitter and generates relatively large noise; in addition, the jitter of the transmission connecting rod will exert radial force on the piston. The force causes the axis of the piston to deviate from the axis of the piston cylinder, which in turn leads to increased wear of the sealing ring of the piston and affects the service life of the piston.

Contents of the invention

Aiming at the defects in the prior art, the technical problem to be solved by the present invention is to provide a flosser water pump, which can greatly reduce the vibration of the transmission connecting rod, further reduce the noise, and improve the coaxiality between the axis of the piston and the axis of the piston cylinder. Spend.

In order to solve the above technical problems, the present invention provides a water pump for dental flossers, which includes a pump housing and a transmission mechanism. A sliding chamber is opened in the pump housing, and a piston is arranged inside the sliding chamber. Driven by the mechanism, the reciprocating linear motion is performed along the center line of the sliding chamber. The piston includes a piston body and a seal embedded in the outer periphery of the piston body. The piston body is connected to the sliding chamber through the seal. The cavity wall is sealed and slidingly connected, and the transmission mechanism includes a transmission member, which is connected with a drive mechanism, and the drive mechanism drives the transmission member to rotate, and a limit shaft and an eccentric shaft are connected to the transmission member, and the eccentric shaft The axis of the transmission part deviates from the rotation axis of the transmission member; the transmission connecting rod has a first rod end and a second rod end, the first rod end is used to connect with the piston body, and the second rod The end is provided with an active slot for the insertion of the eccentric shaft and a limiting slot for the insertion of the limiting shaft; the arrangement path of the limiting slot is a straight line, and the limiting slot is along the moving direction of the piston Arrangement; the arrangement path of the movable groove is a convex closed curve, and the closed curve is a centrally symmetrical shape whose length is greater than the width, and the length direction of the closed curve is perpendicular to the arrangement path of the limiting groove; the eccentric The shaft can move in the movable groove during the rotation of the transmission member, so that the limit groove and the limit shaft move relatively in the length direction of the limit groove, and in the movement of the transmission member When the line connecting the rotation axis and the axis of the eccentric shaft is perpendicular to the length direction of the closed curve, the center of symmetry of the closed curve is located on the line and deviates from the rotation axis of the transmission member.

Preferably, the distance between the center line of the eccentric shaft and the rotation axis of the transmission member forms an eccentric radius; the maximum length of the first closed curved surface formed by the inner wall of the movable groove is less than twice the eccentric radius, so The maximum length of the second closed curved surface formed by the outer wall of the movable groove is greater than twice the eccentric radius, and the maximum widths of the first closed curved surface and the second closed curved surface are both less than twice the eccentric radius.

Preferably, the closed curve is an ellipse, and the long axis direction and the short axis direction of the ellipse respectively form the length direction and the width direction of the closed curve.

Preferably, the groove width of the limiting groove is adapted to the shaft diameter of the limiting shaft, and the central axis of the part of the limiting shaft inserted into the limiting groove is in line with the rotation of the transmission member. The axes coincide.

Preferably, the limiting shaft includes a limiting section and a connecting section, the limiting section is plugged into the limiting groove, the connecting section is connected to the driving mechanism, and the cross section of the connecting section is The transmission part is non-circular, and the transmission part is provided with a connection hole of the transmission part for plug-fitting with the connection section, and the cross-sectional shape of the connection hole of the transmission part is adapted to the cross-sectional shape of the connection section.

Preferably, the drive mechanism includes a motor, the output shaft of the motor is fixedly connected with a worm, and the worm is in meshing transmission connection with a worm wheel. The cross-sectional shape of the connecting section is adapted, the connecting section is non-rotatably inserted into the worm wheel connecting hole, and the rotation axis of the worm wheel coincides with the rotation axis of the transmission member.

Preferably, the seal includes an outer seal ring and an inner seal ring arranged coaxially from outside to inside, the elasticity of the outer seal ring is smaller than that of the inner seal ring; the inner circumference of the inner seal ring and the inner seal ring The outer circumference of the piston body elastically abuts, the outer circumference of the inner sealing ring elastically abuts against the inner circumference of the outer sealing ring, and the outer circumference of the outer sealing ring is in interference fit with the cavity wall of the sliding cavity.

Preferably, the outer sealing ring is made of polytetrafluoroethylene, and the inner sealing ring is made of rubber or silicone.

Preferably, an annular groove is provided on the outer periphery of the piston body, the annular groove is coaxial with the piston body, the inner sealing ring is embedded in the annular groove, and the inner ring of the outer sealing ring surface is located in the annular groove, and the outer annular surface of the outer seal ring is located outside the annular groove; when the seal is assembled on the piston body, the outer periphery of the seal is formed in line with the A mating surface of the sliding chamber with an interference fit, the mating surface is gradually expanded along a direction away from the protruding direction of the piston.

Preferably, the outer ring surface of the outer sealing ring has a gradually expanding surface, and the gradually expanding surface forms the matching surface; when the outer sealing ring is assembled on the outer periphery of the inner sealing ring, the inner sealing ring The outer sealing ring exerts a first acting force, and the acting direction of the first acting force is the same as the radial direction of the outer sealing ring.

The present invention has the following beneficial effects: when the tooth flosser water pump of the present invention is working, the driving mechanism drives the transmission part to rotate, and the eccentric shaft on the transmission part rotates around the rotation axis of the transmission part, that is, the absolute motion track of the eccentric shaft is circular, Since the arrangement path of the movable groove is a closed curve, and the length of the closed curve is greater than its width, that is, there is a path deviation between the closed curve and the absolute motion trajectory of the eccentric shaft, then during the movement of the eccentric shaft, the transmission link can be pushed along the limit. The arrangement path of the slots is a reciprocating linear motion. It can be seen that, through the cooperation of the eccentric shaft and the movable groove, the present invention can convert the rotation of the transmission member into the reciprocating linear motion of the transmission connecting rod, which greatly reduces the vibration of the transmission connecting rod, thereby reducing the noise; at the same time, the transmission connecting rod The reciprocating linear motion is realized, and the radial force acting on the piston body by the transmission connecting rod is almost zero, which greatly improves the coaxiality between the piston and the sliding chamber, reduces the wear of the seal, and is conducive to improving the use of the piston. life.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the specific embodiments or the prior art. Throughout the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, elements or parts are not necessarily drawn in actual scale.

Fig. 1 is a schematic structural view of a dental flosser water pump according to Embodiment 1 of the present invention;

Fig. 2 is an exploded view of the piston and the pump housing of Embodiment 1 of the present invention;

Fig. 3 is a cross-sectional view of the connection structure between the piston and the pump casing in Embodiment 1 of the present invention;

Fig. 4 is a partial enlarged view P in Fig. 3;

Fig. 5 is an exploded view of the transmission mechanism of Embodiment 1 of the present invention;

Fig. 6 is a schematic structural diagram of a transmission link according to Embodiment 1 of the present invention;

Fig. 7 is a schematic diagram of the connection structure of the transmission link, the transmission member and the limit shaft according to Embodiment 1 of the present invention;

Fig. 8 is a schematic diagram of the arrangement path of the movable grooves according to the second embodiment of the present invention.

Reference signs:

1-pump casing; 11-sliding cavity; 2-piston; 21-piston body; 211-annular groove; 22-outer sealing ring; - transmission part; 31- transmission part connecting hole; 32- eccentric shaft; 33- first abutment plane; 4- motor; 5- worm; 6- worm gear; 61- worm gear connection hole; 7- limit shaft; 72-connecting section; 8-transmission connecting rod; 81-first rod end; 82-second rod end; 821-movable groove; 822-limiting groove; 823-second abutment plane.

Detailed ways

Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and therefore are only examples, and cannot limit the protection scope of the present invention with this.

Embodiment one

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, this embodiment provides a water pump for dental flossers, which includes a pump housing 1 and a transmission mechanism, and a sliding chamber 11 is opened in the pump housing 1, in which A piston 2 is arranged inside the sliding chamber 11, and the piston 2 can make a reciprocating linear motion along the centerline direction of the sliding chamber 11 under the drive of the transmission mechanism. The piston 2 includes a piston body 21 and a seal embedded in the outer periphery of the piston body 21 The piston body 21 is in sealing and sliding connection with the wall of the sliding chamber 11 through the sealing member.

Specifically, the above seal includes an outer seal ring 22 and an inner seal ring 23 arranged coaxially from outside to inside, and the elasticity of the outer seal ring 22 is smaller than that of the inner seal ring 23 . The inner circumference of the inner seal ring 23 is in elastic contact with the outer circumference of the piston body 21, the outer circumference of the inner seal ring 23 is in elastic contact with the inner circumference of the outer seal ring 22, and the outer circumference of the outer seal ring 22 is in contact with the wall of the sliding chamber 11. In this way, the sealing and sliding connection between the piston 2 and the sliding chamber 11 is realized.

In this embodiment, the above-mentioned inner sealing ring 23 is made of rubber or silica gel, and the outer sealing ring 22 is made of polytetrafluoroethylene, which is wear-resistant and has a self-lubricating function. Adding lubricating oil will not affect the quality of the water pumped by the water pump, and the user experience is better.

As the use time increases, the outer seal ring 22 will gradually wear out, so that the interference between the outer seal ring 22 and the wall of the sliding chamber 11 decreases. At this time, the inner seal ring 23 will exert a force, so that the outer seal ring 22 expands outwards to compensate for the reduced interference due to the wear of the outer seal ring 22, so as to ensure the sealing performance between the seal and the wall of the sliding chamber 11, and improve the traditional flushing The sealing structure of the dental water pump is prone to seal failure due to wear and tear, which greatly improves the service life of the piston 2 .

Specifically, the outer circumference of the piston body 21 is provided with an annular groove 211, the annular groove 211 is coaxial with the piston body 21, the inner sealing ring 23 is embedded in the annular groove 211, and the inner sealing ring 22 The annular surface is located in the annular groove 211 , and the outer annular surface of the outer sealing ring 22 is located outside the annular groove 211 . In this embodiment, the inner sealing ring 23 elastically abuts against the groove walls on both sides of the annular groove 211, and the thickness of the outer sealing ring 22 along its axial direction is adapted to the groove width of the annular groove 211, so as to limit the relative The axial position of the piston body 21 prevents the seal from moving during the movement of the piston 2 .

More specifically, the ratio of the thickness of the inner sealing ring 23 along its axial direction to the groove width of the annular groove 211 is 1.01-1.2. In this embodiment, the cross-sectional shape of the inner sealing ring 23 in a free state is circular. In practice, the cross-sectional shape of the inner sealing ring 23 may also be oval or elliptical.

Further, when the seal is assembled on the piston body 21 , the outer periphery of the seal forms a mating surface with an interference fit with the sliding chamber 11 , and the mating surface is gradually expanded along a direction away from the piston 2 . In this embodiment, the matching surface is a tapered surface, and the taper of the matching surface is 1-5 degrees. With this structural design, after the assembly is completed, the outer ring surface of the outer sealing ring 22 will be squeezed by the wall of the sliding chamber 11 and deformed, and the outer ring of the outer sealing ring 22 will move in the direction of the central axis of the sliding chamber 11. If the outer seal ring 22 wears to a certain extent, the outer seal ring 22 will restore the deformation to a certain extent, so as to compensate the wear of the outer seal ring 22 to a certain extent, so as to ensure the contact between the outer ring surface of the outer seal ring 22 and the sliding chamber 11. There is still a good seal between the cavity walls.

In this embodiment, the outer ring surface of the outer sealing ring 22 has a gradually expanding surface 221, and the gradually expanding surface 221 forms the above-mentioned mating surface; when the outer sealing ring 22 is assembled on the outer periphery of the inner sealing ring 23, the inner sealing ring 23 seals outward The ring 22 exerts a first action force, and the action direction of the first action force is the same as the radial direction of the outer sealing ring 22 . In practice, the surface on the outer ring surface of the outer sealing ring 22 for interference fit with the wall of the sliding cavity 11 can also be designed as a cylindrical surface, and the inner sealing ring 23 can be designed as a non-circular shape, so that the outer sealing After the ring 22 is assembled on the outer periphery of the inner seal ring 23, the inner seal ring 23 can apply a second force to the outer seal ring 22, and the acting direction of the second force forms an acute angle with the radial direction of the outer seal ring 22, Then the outer sealing ring 22 will be deformed under the action of the second acting force, so that the above-mentioned cylindrical surface turns through the same angle as the above-mentioned acute angle and forms the above-mentioned mating surface with a certain taper.

Further, a guiding slope 222 is provided at the intersection of the outer ring surface of the above-mentioned outer sealing ring 22 and the side facing away from the extending direction of the piston 2 , and the guiding slope 222 is connected with the expanding surface 221 . The design of the guide inclined surface 222 is beneficial to improve the efficiency of assembling the piston 2 into the sliding cavity 11 .

Further, the inner circumference of the outer sealing ring 22 can also be coaxially provided with an annular matching groove (not shown in the figure), and the outer circumference of the inner sealing ring 23 is embedded in the annular matching groove. In this way, during the assembly process, it can First put the outer ring surface of the inner seal ring 23 into the annular matching groove, and then assemble the inner seal ring 23 and the outer seal ring 22 to the piston body 21 as a whole, and this design can also improve the inner seal ring 23. Sealing performance with the outer sealing ring 22.

Referring to Fig. 1, Fig. 5, Fig. 6 and Fig. 7, the above-mentioned transmission mechanism includes a transmission member 3, and the transmission member 3 is connected with a drive mechanism, and the drive mechanism specifically includes a motor 4, a worm screw 5 connected to the output shaft of the motor 4, and The worm wheel 6 meshed with the worm 5, the output shaft of the motor 4 rotates, drives the worm 5 to rotate, and then drives the worm wheel 6 to rotate, and the rotation axis of the worm wheel 6 and the rotation axis of the worm 5 are perpendicular to each other.

The above-mentioned worm wheel 6 is penetrated with a worm wheel connection hole 61 with a non-circular cross section, and the limit shaft 7 is inserted into the worm wheel connection hole 61, and the limit shaft 7 includes a limit shaft with a circular cross section from top to bottom. Section 71 and a connecting section 72 with a non-circular cross section, wherein the connecting section 72 is inserted into the worm gear connecting hole 61, and the cross section of the connecting section 72 is a non-circular shape adapted to the cross section of the worm gear connecting hole 61 , then when the worm wheel 6 rotates, it will drive the limit shaft 7 to rotate synchronously.

A transmission member connecting hole 31 adapted to the connecting section 72 is provided on the above-mentioned transmission member 3, and the transmission member 3 is non-rotatably sleeved on the outer periphery of the connection section 72. Then, when the motor 4 is working, the transmission member 3 can be limited Driven by the positioning shaft 7 , it rotates synchronously with the worm wheel 6 , and the rotation axis of the transmission member 3 coincides with the axis of the limiting section 71 .

Also connected with the eccentric shaft 32 on the above-mentioned transmission part 3, the eccentric shaft 32 and the transmission part 3 have an integral structure, and the axis of the eccentric shaft 32 deviates from the rotation axis of the transmission part 3, then when the motor 4 works, the eccentric shaft 32 Rotate around the axis of rotation of the transmission member 3 .

The above-mentioned transmission mechanism also includes a transmission link 8 , and the transmission link 8 has a first rod end 81 and a second rod end 82 . The first rod end 81 is connected with the piston body 21 to drive the piston body 21 to make a reciprocating linear motion; the second rod end 82 is provided with a movable groove 821 for the insertion of the eccentric shaft 32 and a limit position for the limit shaft 7 The limit slot 822 where the segment 71 is inserted. The arrangement path of the limiting groove 822 is a straight line, and the limiting groove 822 is arranged along the movement direction of the piston body 21, and the groove width of the limiting groove 822 is adapted to the shaft diameter of the limiting section 71 of the limiting shaft 7; The arrangement path of the movable groove 821 is an outwardly convex closed curve, and the closed curve is a centrally symmetrical shape whose length is greater than the width, and the length direction of the closed curve is perpendicular to the arrangement path of the limiting groove 822 .

The eccentric shaft 32 of this embodiment can move in the movable groove 821 during the rotation of the transmission member 3, so that the limit groove 822 and the limit shaft 7 move relatively in the length direction of the limit groove 822, and the transmission member When the line connecting the axis of rotation of 3 and the axis of the eccentric shaft 32 is perpendicular to the length direction of the closed curve, the center of symmetry of the closed curve is located on the line and deviates from the axis of rotation of the transmission member 3, while the center of symmetry of the closed curve is in line with the transmission The vertical distance between the rotation axes of parts 3 is 1/2 of the limit stroke of transmission connecting rod 8 .

When working, as the driving mechanism drives the transmission part 3 to rotate, the eccentric shaft 32 rotates around the rotation axis of the transmission part 3, and the absolute motion track of the eccentric shaft 32 is a circle. Since the arrangement path of the movable groove 821 is a closed curve, and the The length of the closed curve is greater than its width, that is, there is a path deviation between the closed curve and the absolute motion trajectory of the eccentric shaft, then during the movement of the eccentric shaft 32, the transmission connecting rod 8 can be pushed to make a reciprocating straight line along the arrangement path of the limit groove 822 sports. It can be seen that in this embodiment, through the cooperation of the eccentric shaft 32 and the movable groove 821, the rotation of the transmission member 3 can be converted into the reciprocating linear motion of the transmission link 8, which greatly reduces the vibration of the transmission link 8, thereby reducing the noise. Simultaneously, the transmission connecting rod 8 has realized the reciprocating linear motion, and the radial force acting on the piston by the transmission connecting rod 8 is almost zero, which greatly improves the coaxiality between the piston body 21 and the sliding chamber 11, and reduces the external force. The wear of the sealing ring 22 is beneficial to improve the service life of the piston 2 .

Specifically, the distance between the center line of the eccentric shaft 32 and the axis of rotation of the transmission member 3 forms an eccentric radius, the maximum length of the first closed curved surface formed by the inner wall of the movable groove 821 is less than twice the eccentric radius, and the outer wall of the movable groove 821 forms The maximum length of the second closed curved surface is greater than twice the eccentric radius, and the maximum widths of the first closed curved surface and the second closed curved surface are both less than twice the eccentric radius, so as to ensure that the eccentric shaft 32 can move smoothly along the movable groove 821.

The above-mentioned closed curve is designed as a centrosymmetric figure, which can make the reciprocating motion of the transmission connecting rod 8 more stable. In this embodiment, the closed curve is preferably an ellipse, and the major axis direction and the minor axis direction of the ellipse respectively form a closed curve. lengthwise and widthwise.

Referring to Fig. 7, in the state shown in Fig. 7, the transmission connecting rod 8 is in its extreme extension position, taking the clockwise rotation of the eccentric shaft 32 as an example, when the eccentric shaft 32 turns over 180 degrees, the transmission connecting rod 8 retracts to Its limit retraction position, when the eccentric shaft 32 continues to rotate to 360 degrees, the transmission connecting rod 8 extends to its limit extension position again, it can be seen that when the eccentric shaft 32 rotates one circle, the transmission connection rod 8 completes a reciprocation movement, that is, the water pump of the flosser pumps once.

Specifically, the above-mentioned transmission member 3 has a first abutment plane 33, and the first abutment plane 33 is perpendicular to the axis of the limit shaft 7; the second rod end 82 has a second abutment plane 823, and the second abutment plane 823 is vertical On the axis of the limiting shaft 7 , the first abutting plane 33 and the second abutting plane 823 abut against each other. In this embodiment, the movable slot 821 is defined on the second abutting plane 823 , and the eccentric shaft 32 is connected to the first abutting plane 33 .

Specifically, the limiting slot 822 is an oblong slot, and the bottom of the slot passes through the second rod end 82 .

It should be noted that, in practice, bevel gear transmission can also be used to drive the transmission member 3, such as the output shaft of the motor 4 drives the transmission member 3 to rotate through bevel gear transmission, but this bevel gear transmission method is more noisy, and Not stable, not as good as the transmission mode of the worm gear of this embodiment.

Embodiment two

The flosser water pump in this embodiment has roughly the same structure as the flosser water pump disclosed in Embodiment 1, except that the closed curve of the arrangement path of the movable groove 821 in Embodiment 1 is elliptical, while in this embodiment, the movable The closed curve of the arrangement path of the groove 821 is a centrally symmetrical special-shaped curve. Referring to FIG. Two large-radius arcs, and the large-radius arc is tangent to the small-radius arc.

In practice, other multi-segment circular arcs may also be used to form the closed curve mentioned in the first embodiment.

Embodiment Three

The flosser water pump in this embodiment has roughly the same structure as the flosser water pump disclosed in Embodiment 1, except that the transmission part 3 of this embodiment is a worm gear, so the transmission part 3 can be directly connected to the motor output The worm on the shaft engages and is fixedly connected to the eccentric shaft 32 in the first embodiment on the transmission member 3, that is, the worm wheel and the transmission member in the first embodiment are designed as one part.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. It should be included within the scope of the claims and description of the present invention.

Claims

A tooth flosser water pump, comprising a pump housing and a transmission mechanism. A sliding chamber is provided in the pump housing, and a piston is arranged inside the sliding chamber. The piston can move along the direction of the sliding chamber under the drive of the transmission mechanism. Reciprocating linear motion in the direction of the center line, the piston includes a piston body and a seal embedded in the outer periphery of the piston body, the piston body is sealed and slidably connected with the wall of the sliding cavity through the seal, and the feature is that, The transmission mechanism includes:

A transmission member, the transmission member is connected with a driving mechanism, the drive mechanism drives the transmission member to rotate, a limit shaft and an eccentric shaft are connected to the transmission member, and the axis of the eccentric shaft deviates from the rotation axis of the transmission member;

A transmission connecting rod, the transmission connecting rod has a first rod end and a second rod end, the first rod end is used to connect with the piston body, and the second rod end is provided with a hole that can be inserted into the eccentric shaft An active slot and a limiting slot that can be inserted into the limiting shaft; the arrangement path of the limiting slot is a straight line, and the limiting slot is arranged along the moving direction of the piston; the arrangement path of the active slot is the outer A convex closed curve, and the closed curve is a centrally symmetrical shape with a length greater than the width, and the length direction of the closed curve is perpendicular to the arrangement path of the limiting groove;

The eccentric shaft can move in the movable groove during the rotation of the transmission member, so that the limiting groove and the limiting shaft relatively move in the length direction of the limiting groove, and the When the line connecting the rotation axis of the transmission member and the axis of the eccentric shaft is perpendicular to the length direction of the closed curve, the center of symmetry of the closed curve is located on the connection line and deviates from the rotation axis of the transmission member.
A tooth flosser water pump according to claim 1, characterized in that:

The distance between the center line of the eccentric shaft and the rotation axis of the transmission member forms an eccentric radius;

The maximum length of the first closed curved surface formed by the inner wall of the movable groove is less than twice the eccentric radius, the maximum length of the second closed curved surface formed by the outer wall of the movable groove is greater than twice the eccentric radius, and the first The maximum widths of both the closed curved surface and the second closed curved surface are less than twice the eccentric radius.
A tooth flosser water pump according to claim 2, characterized in that:

The closed curve is an ellipse, and the long axis direction and the short axis direction of the ellipse respectively form the length direction and the width direction of the closed curve.
A tooth flosser water pump according to claim 1, characterized in that:

The groove width of the limiting groove is adapted to the shaft diameter of the limiting shaft, and the central axis of the portion of the limiting shaft inserted into the limiting groove coincides with the rotation axis of the transmission member.
A tooth flosser water pump according to claim 1, characterized in that:

The limiting shaft includes a limiting section and a connecting section, the limiting section is inserted into the limiting groove, the connecting section is connected to the driving mechanism, and the cross section of the connecting section is non-circular , the transmission member is provided with a transmission member connection hole for plug-fitting with the connection section, and the cross-sectional shape of the transmission member connection hole is adapted to the cross-sectional shape of the connection section.
A tooth flosser water pump according to claim 5, characterized in that:

The drive mechanism includes a motor, the output shaft of the motor is fixedly connected with a worm, and the worm is engaged with a worm gear for transmission connection. The worm gear is provided with a worm gear connection hole, and the cross-sectional shape of the worm gear connection hole is consistent with that of the connecting section. The cross-sectional shape of the worm wheel is adapted, the connecting section is non-rotatably inserted into the worm wheel connecting hole, and the rotation axis of the worm wheel coincides with the rotation axis of the transmission member.
A tooth flosser water pump according to claim 1, characterized in that:

The seal includes an outer seal ring and an inner seal ring arranged coaxially from outside to inside, the elasticity of the outer seal ring is smaller than that of the inner seal ring;

The inner circumference of the inner sealing ring elastically abuts against the outer circumference of the piston body, the outer circumference of the inner sealing ring elastically abuts against the inner circumference of the outer sealing ring, and the outer circumference of the outer sealing ring contacts the sliding The walls of the cavity are an interference fit.
A tooth flosser water pump according to claim 7, characterized in that:

The outer sealing ring is made of polytetrafluoroethylene, and the inner sealing ring is made of rubber or silicone.
A tooth flosser water pump according to claim 7, characterized in that:

The outer circumference of the piston body is provided with an annular groove, which is coaxial with the piston body, the inner sealing ring is embedded in the annular groove, and the inner ring surface of the outer sealing ring is located at the In the annular groove, the outer ring surface of the outer sealing ring is located outside the annular groove;

When the sealing member is assembled on the piston body, the outer periphery of the sealing member forms a mating surface with an interference fit with the sliding chamber, and the mating surface is gradually expanded along the extending direction away from the piston.
A tooth flosser water pump according to claim 9, characterized in that:

The outer annular surface of the outer sealing ring has a gradually expanding surface, and the gradually expanding surface forms the matching surface;

When the outer sealing ring is assembled on the outer periphery of the inner sealing ring, the inner sealing ring applies a first force to the outer sealing ring, and the acting direction of the first force is the same as the diameter of the outer sealing ring. in the same direction.