Water pump for dental flosser

Abstract

The present invention discloses a water pump for a water flosser, comprising a housing, a three-port piston cylinder, a push-pull rod, a water inlet connecting pipe, a piston and a motor; the upper end of the three-port piston cylinder is an acceleration valve port, the lower end of the three-port piston is a piston port, the middle part of the three-port piston cylinder is provided with a water inlet interface, and a one-way acceleration valve arranged along the length direction of the three-port piston cylinder is inserted in the acceleration valve port. The water pump for a water flosser of the present invention is designed with a special one-way acceleration valve according to the principle of the Tesla valve, which can increase the flow rate of the liquid passing through the acceleration valve, so that the liquid can be pumped out at the same speed with less power through the water pump, providing the possibility of improving the existing power source of the water pump and creating space for reducing the pump body; due to the existence of the acceleration valve, the spiral gear is removed, so that the water pump has less noise and lower vibration during overall operation, which can significantly improve the user experience.

Description

Technical Field

[0001] The invention relates to the field of teeth cleaning equipment, and in particular to a water pump for a water flosser. Background Art

[0002] As people pay more attention to oral health, especially dental health, water flossers have become a popular tooth cleaning tool. They are very effective in cleaning the gaps between teeth. They are convenient and efficient, cause less damage to the gums, and are more environmentally friendly. They are gradually replacing traditional teeth cleaning tools. Common water flossers are portable and desktop. Portable ones are more popular with users because they are not restricted by wires and usage scenarios. However, in order to ensure the portability of water flossers, the size of portable water flossers is greatly limited, and high requirements are placed on the design of each component inside the water flosser. The water pump used in existing portable water flossers uses a DC micromotor to drive a helical gear to drive the piston to pump water. This design limits the further reduction of the water pump volume, and it is very noisy when used, and the user experience is not good. Summary of the invention

[0003] In order to solve the problem that the water pump for oral irrigators in the prior art mentioned above utilizes a DC micromotor to drive a helical gear to drive a piston to pump water, resulting in a large pump body and high noise, the present invention provides a water pump for oral irrigators. A special acceleration valve is arranged on the water outlet of the water pump, which can not only increase the water outlet speed, but also greatly reduce the backflow of water outlet, so that the volume of the water pump can be designed to be smaller, and a motor with lower power can be used, thereby reducing the noise of the water pump.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a water pump for a water flosser, comprising a shell, a three-port piston cylinder, a push-pull rod, a water inlet connecting pipe, a piston and a motor, the three-port piston cylinder is arranged above the motor, and the water inlet connecting pipe is arranged at a position corresponding to the middle of the three-port piston cylinder; the upper end of the three-port piston cylinder is an acceleration valve port, and a one-way acceleration valve arranged along the length direction of the three-port piston cylinder is inserted in the acceleration valve port, the upper end of the one-way acceleration valve is a water outlet, and the lower end of the one-way acceleration valve is a water inlet, and an acceleration channel connecting the water inlet and the water outlet is provided in the one-way acceleration valve. The speed channel is provided with more than three acceleration units from top to bottom, and the acceleration units include a first channel, a second channel and an arc-shaped channel. The front ends of the first channel and the second channel are connected and form an angle A, and the angle A satisfies 25°≤A≤80°. One end of the arc-shaped channel is tangent to the end of the second channel, and the other end of the arc-shaped channel is provided with a transition part extending to the first channel, and the transition part directly forms an angle B with the first channel, and the angle B satisfies 15°≤B≤90°; the front end where the first channel and the second channel of the lower acceleration unit are connected is connected to the end of the first channel of the upper acceleration unit.

[0005] The technical solution adopted by the present invention to solve the technical problem further includes:

[0006] As for the water pump for a water flosser as described above, the angle A is 48°, and the angle B is 18°.

[0007] As described above, a water pump for a water flosser, the lower end of the three-port piston cylinder is a piston port, the piston is arranged in the three-port piston cylinder above the piston port, one end of the push-pull rod extends from the piston port into the three-port piston cylinder and is connected to the piston, and the other end of the push-pull rod is connected to the motor; the motor is a DC reduction motor, the motor is connected to the eccentric wheel and drives the eccentric wheel to rotate, the lower end of the push-pull rod is provided with a ring, the shape and size of the ring are consistent with the shape and size of the eccentric wheel, the ring is sleeved on the eccentric wheel, so that the push-pull rod reciprocates up and down with the rotation of the eccentric wheel.

[0008] In the water pump for oral irrigator as described above, the motor is connected to the eccentric wheel via an adapter, and the motor is arranged on one side of the housing along a direction perpendicular or parallel to the water outlet direction of the water pump for oral irrigator.

[0009] As described above, a water pump for a water flosser, the acceleration valve comprises a first valve body and a second valve body that seal and cooperate with each other, grooves are respectively provided on the surfaces of the first valve body and the second valve body that fit together, and the grooves on the first valve body and the second valve body correspond to each other to form the acceleration channel.

[0010] According to the water pump for a water flosser as described above, the shape of the water inlet interface is consistent with the shape of the water inlet connecting pipe, a limiting platform is provided in the water inlet interface, the limiting platform abuts against the water inlet connecting pipe, a water inlet hole is provided in the middle of the limiting platform, and a water outlet hole corresponding to the water inlet hole is provided on the surface where the water inlet connecting pipe abuts against the limiting platform; a water stop groove is provided in the middle of the limiting platform along the edge of the water inlet hole, a one-way water stop valve plate is provided between the limiting platform and the water inlet connecting pipe, the one-way water stop valve plate includes an annular fixing portion and a water stop portion, the annular water stop portion abuts against the limiting platform and the water inlet connecting pipe, the water stop portion is arranged in the middle of the annular fixing portion opposite to the water outlet hole and one end is connected to the annular fixing portion, the size of the water stop groove is larger than the size of the water stop portion, the water stop portion covers the water outlet hole and can be opened in the direction of the water stop groove.

[0011] As described above, a water pump for a water flosser is provided with a reset spring between the water stop groove and the water stop portion, the first end of the reset spring abuts against the bottom of the water stop groove, the second end of the reset spring abuts against the water stop portion, the size of the first end of the reset spring matches the size of the water stop groove, and the size of the second end matches the size of the water stop portion.

[0012] As described above, a water pump for a water flosser, the outer shell includes a first shell and a second shell combined together, the first shell is provided with a motor fixing cavity for fixing the motor and a pipe fixing cavity for fixing the water inlet connecting pipe, and the pipe fixing cavity is arranged above the motor fixing cavity.

[0013] In the water pump for a dental flosser as described above, a limiting block for limiting the three-port piston cylinder is provided in the middle of the second shell, and the limiting block is arranged at a position opposite to the connecting pipe fixing cavity.

[0014] As for the water pump for oral irrigator as described above, a hook and a limit block for facilitating installation of a PCBA board of the oral irrigator are provided on the outer surface of the second shell.

[0015] The beneficial effects of the present invention are as follows: the water pump for the oral irrigator of the present invention is designed with a special acceleration valve based on the principle of the Tesla valve, which can increase the flow rate of the liquid passing through the acceleration valve, so that the liquid can be pumped out at the same speed through the water pump with less power, which provides the possibility of improving the existing power source of the water pump and creates space for reducing the pump body; due to the presence of the acceleration valve, the water pump for the oral irrigator of the present invention uses a reduction motor as the power source of the water pump, and the reduction motor can be used to drive the push-pull rod of the piston. There is no need to adopt the existing design of using helical gears to reduce the speed of the motor, and the helical gears are removed, thereby eliminating a large amount of noise generated by the helical gears during operation, so that the water pump has less noise and lower vibration during overall operation, which can significantly improve the user experience.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of Embodiment 1 of the water pump for a water flosser of the present invention;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure along the straight line CC;

[0019] Figure 3 An exploded view of Embodiment 1 of the water pump for a water flosser of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the first valve body of the acceleration valve in the first embodiment of the water pump for the oral irrigator of the present invention;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of a second embodiment of a water pump for a water flosser of the present invention;

[0022] Figure 6 It is a schematic diagram of the cross-sectional structure along the straight line DD;

[0023] Figure 7 It is an exploded view of the second embodiment of the water pump for the oral irrigator of the present invention;

[0024] In the figure, 1, housing, 11, first housing, 111, motor fixing chamber, 112, pipe fixing chamber, 12, second housing, 121, limit block, 2, three-port piston cylinder, 21, acceleration valve port, 22, piston port, 23, water inlet interface, 231, limit platform, 232, water inlet hole, 233, water stop groove, 234, one-way water stop valve plate, 2341, annular fixing part, 2342, water stop part, 235. reset spring, 2351. first end, 2352. second end, 3. push-pull rod, 31. collar, 4. water inlet connecting pipe, 41. water outlet, 5. piston, 6. motor, 61. eccentric wheel, 7. one-way acceleration valve, 71. acceleration channel, 711. acceleration unit, 7111. first channel, 7112. second channel, 7113. arc-shaped channel, 72. first valve body, 73. second valve body. DETAILED DESCRIPTION

[0025] This embodiment is a preferred implementation mode of the present invention. All other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the present invention.

[0026] 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.

[0027] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0029] The first embodiment of the water pump for the water flosser of the present invention is shown in FIG. Figure 1-4 As shown, it includes a shell 1, a three-port piston cylinder 2, a push-pull rod 3, a water inlet connecting pipe 4, a piston 5 and a motor 6. The shell 1 is provided with mounting positions for fixing the motor 6, the three-port piston cylinder 2 and the water inlet connecting pipe 4. In this embodiment, in order to cooperate with the design of the water discharger to discharge water upward, the three-port piston cylinder 2 is arranged above the motor 6, and the water inlet connecting pipe 4 is arranged at a position corresponding to the middle of the three-port piston cylinder 2. The shell 1 includes a first shell 11 and a second shell 12 combined together. The mounting positions are a motor fixing chamber 111 and a pipe fixing chamber 112 arranged on the first shell 11. The pipe fixing chamber 112 is arranged at a position corresponding to the middle of the first shell 11 and the middle of the three-port piston cylinder 2, above the motor fixing chamber 111. The motor 6 is installed in the motor fixing chamber 111, and the water inlet connecting pipe 4 is installed in the pipe fixing chamber 112. The pipe fixing chamber 112 is provided with a connecting port for the water inlet connecting pipe 4 to extend outward.

[0030] In this embodiment, the three-port piston cylinder 2 is provided with three openings, namely, upper, middle and lower. The upper opening is the acceleration valve port 21, the lower opening of the three-port piston 5 is the piston port 22, and the middle opening of the three-port piston cylinder 2 is a water inlet interface 23, which is connected to the water inlet connecting pipe 4 arranged at a corresponding position. The piston 5 is arranged in the three-port piston cylinder 2 between the water inlet interface 23 and the piston port 22, one end of the push-pull rod 3 extends from the piston port 22 into the three-port piston cylinder 2 and is connected to the piston 5, and the other end of the push-pull rod 3 is connected to the motor 6, which drives the piston 5 to reciprocate in the three-port piston cylinder 2 through the push-pull rod 3. In this embodiment, the motor 6 is a DC reduction motor 6, which is connected to the eccentric wheel 61 and drives the eccentric wheel 61 to rotate. The lower end of the push-pull rod 3 is provided with a collar 31, and the shape and size of the collar 31 are consistent with the shape and size of the eccentric wheel 61. The collar 31 is sleeved on the eccentric wheel 61, so that the push-pull rod 3 reciprocates up and down with the rotation of the eccentric wheel 61, driving the piston 5 to move. A one-way acceleration valve 7 arranged along the length direction of the three-port piston cylinder 2 is inserted in the acceleration valve port 21, the upper end of the one-way acceleration valve 7 is a water outlet, and the lower end of the one-way acceleration valve 7 is a water inlet. The one-way acceleration valve 7 is provided with an acceleration channel 71 connecting the water inlet and the water outlet, and the acceleration channel 71 is provided with more than three acceleration units 711 from top to bottom. In this embodiment, the acceleration channel 71 is provided with four acceleration units 711, and each acceleration unit 711 is composed of three parts: a first channel 7111, a second channel 7112, and an arc channel 7113. Among them, one end of the first channel 7111 and the second channel 7112 are connected to form an angle A, and the angle A satisfies 25°≤A≤80°. In this embodiment, the angle A is 48°. One end of the arc channel 7113 is tangent to the end of the second channel 7112, and the other end of the arc channel 7113 is provided with a transition portion extending to the first channel 7111, and the transition portion directly forms an angle B with the first channel 7111, and the angle B satisfies 15°≤B≤90°. In this embodiment, the size of the angle B is 18°. The front end of the first channel 7111 and the second channel 7112 of the acceleration unit 711 arranged at the bottom is connected to the end of the first channel 7111 arranged at the upper acceleration unit 711, so that the upper and lower acceleration units 711 are connected.

[0031] The motor 6 is connected to the eccentric wheel 61 through the adapter 62. The motor 6 is arranged on one side of the shell 1 along a direction perpendicular or parallel to the water outlet direction of the water pump of the oral irrigator. In this embodiment, the motor 6 is arranged in the motor fixing cavity 111 of the first shell 11 along a direction parallel to the water outlet direction of the water pump of the oral irrigator.

[0032] In this embodiment, in order to facilitate the production of the one-way acceleration valve 7, the one-way acceleration valve 7 includes a first valve body 72 and a second valve body 73 combined together, and grooves are respectively provided on the surfaces of the first valve body 72 and the second valve body 73 that are in contact with each other, and the grooves on the first valve body 72 and the second valve body 73 correspond to each other to form an acceleration channel 71.

[0033] When the motor 6 pushes the piston 5 upward to squeeze out the water in the three-port piston cylinder 2, the water pumped in will be squeezed out again from the water inlet interface 23, which will affect the pumping efficiency of the water pump. Therefore, in this embodiment, corresponding structures and parts are provided in the water inlet interface 23 to prevent the water coming in from the water inlet interface 23 from being pumped out again. In order to ensure the sealing between the water inlet interface 23 and the water inlet connecting pipe 4, the shape of the water inlet interface 23 is consistent with the shape of the water inlet connecting pipe 4, and a limiting platform 231 is provided in the water inlet interface 23. The limiting platform 231 abuts against the water inlet connecting pipe 4 to limit the water inlet connecting pipe 4 from entering the three-port piston cylinder 2 from the water inlet interface 23. A water inlet hole 232 is provided in the middle of the limiting platform 231, and a water outlet hole 41 corresponding to the water inlet hole 232 is provided on the surface where the water inlet connecting pipe 4 abuts against the limiting platform 231, so that water can enter the three-port piston cylinder 2 from the water inlet connecting pipe 4. A water stop groove 233 is provided in the middle of the limiting platform 231 along the edge of the water inlet hole 232, and a one-way water stop valve plate 234 is provided between the limiting platform 231 and the water inlet connecting pipe 4. The one-way water stop valve plate 234 includes an annular fixing portion 2341 and a water stop portion 2342. The annular water stop portion 2342 is larger than the water stop groove 233 and abuts against the limiting platform 231 and the water inlet connecting pipe 4, so that the one-way water stop valve plate 234 is fixed between the limiting platform 231 and the water inlet connecting pipe 4; the water stop portion 2342 is provided in the middle of the annular fixing portion 2341 opposite to the water outlet hole 41 and one end is connected to the annular fixing portion 2341. The size of the water stop groove 233 is larger than the size of the water stop portion 2342. The water stop portion 2342 covers the water outlet hole 41 and can be opened in the direction of the water stop groove 233, so that water can flow out of the water outlet hole 41.

[0034] Since the water pump frequency of the water flosser is very high, the one-way water stop valve plate 234 needs to be repeatedly opened and closed at high speed when in use, and the position where the water stop portion 2342 is connected to the annular water stop portion 2342 is easily deformed or cracked due to high-intensity use. To avoid this situation, a return spring 235 is provided between the water stop groove 233 and the water stop portion 2342 in this embodiment, and the first end 2351 of the return spring 235 abuts against the groove bottom of the water stop groove 233, and the second end 2352 of the return spring 235 abuts against the water stop portion 2342. Due to the difference in size between the water stop groove 233 and the water stop portion 2342, in order to make the return spring 235 more stable for the return effect of the water stop portion 2342, the diameter of the return spring 235 gradually decreases from the first end 2351 to the second end 2352, so that the size of the first end 2351 is consistent with the size of the water stop groove 233, and the size of the second end 2352 is consistent with the size of the water stop portion 2342.

[0035] In order to prevent the three-port piston cylinder 2 from being displaced due to the reciprocating motion of the piston 5 or the excessive pressure between the upper water outlet and the nozzle of the water flosser, a limiting block 121 for limiting the three-port piston cylinder 2 is provided in the middle of the second housing 12 in this embodiment, and the limiting block 121 is arranged at a position opposite to the pipe fixing cavity 112. In this embodiment, the upward side surface of the limiting block 121 is a plane perpendicular to the inner wall of the second housing 12, and the downward side of the limiting block 121 is an inclined surface.

[0036] In order to facilitate the installation of the PCBA board when assembling the oral irrigator, a hook 122 and a limit block 123 for facilitating the installation of the PCBA board of the oral irrigator are provided on the outer surface of the second shell 12 .

[0037] When the dental flosser is running, the PCBA board of the control motor 6 receives a signal, the control motor 6 starts, and the push-pull rod 3 pushes the piston 5 to start reciprocating movement in the three-port piston cylinder 2. When the piston 5 moves downward, due to the effect of pressure, water pushes the water stop portion 2342 of the one-way water stop valve plate 234 from the water outlet hole 41 of the water inlet connecting pipe 4 and enters the three-port piston cylinder 2. At the same time, the water or air in the one-way acceleration valve 7 also enters the three-port piston cylinder 2 due to the effect of pressure, but is divided into two parts with similar flow rates by the first channel 7111 and the second channel 7112 when entering the first acceleration unit 711 of the acceleration channel 71. The first part of the fluid continues to flow downward along the first channel 7111, and the second part of the fluid flows downward along the second channel 7112 and enters the arc channel 7113. The flow direction is changed to be almost opposite to that of the first part of the fluid by the arc channel 7113, and then merges with the first part of the fluid at the intersection of the arc channel 7113 and the first channel 7111. Due to the opposite flow direction, the flow of the first part of the fluid is blocked, so that only a small amount of the first part of the fluid can enter the second acceleration unit 711. Then, due to the structure of the second acceleration unit 711, the fluid continues to decrease until almost no fluid passes through the one-way acceleration valve 7. When the piston 5 moves upward, water is squeezed outward from the three-port piston cylinder 2 by the piston 5, pushing the water stop 2342 to cover the water outlet 41, so that the water cannot flow outward from the water inlet connecting pipe 4, and can only flow upward from the one-way acceleration valve 7. Therefore, water can only flow to the one-way acceleration valve 7 and enter the acceleration channel 71. When entering the first acceleration unit 711, only a small part of the water is diverted by the arc channel 7113, and most of it flows directly upward along the first channel 7111. The part diverted by the arc channel 7113 flows through the second channel 7112 and becomes similar to the part flowing along the first channel 711, which can give the part flowing along the first channel 711 an acceleration, making the water flow faster. After repeated acceleration by multiple acceleration units 711, the water pump of the water flosser has a higher water outlet speed and pressure.

[0038] The water pump for water flosser of the present invention is shown in the second embodiment. Figure 5-7As shown, it includes a housing 1, a three-port piston cylinder 2, a push-pull rod 3, a water inlet connecting pipe 4, a piston 5 and a motor 6. The housing 1 is provided with mounting positions for fixing the motor 6, the three-port piston cylinder 2 and the water inlet connecting pipe 4. The three-port piston cylinder 2 is arranged above the motor 6, and the water inlet connecting pipe 4 is arranged at a position corresponding to the middle of the three-port piston cylinder 2. The upper end of the three-port piston cylinder 2 is an acceleration valve port 21, the lower end of the three-port piston 5 is a piston port 22, the middle of the three-port piston cylinder 2 is provided with a water inlet interface 23, the water inlet connecting pipe 4 is connected with the water inlet interface 23, the piston 5 is arranged in the three-port piston cylinder 2 between the water inlet interface 23 and the piston port 22, one end of the push-pull rod 3 extends from the piston port 22 into the three-port piston cylinder 2 and is connected to the piston 5, and the other end of the push-pull rod 3 is connected to the motor 6, and the motor 6 drives the piston 5 to reciprocate in the three-port piston cylinder 2 through the push-pull rod 3. A one-way acceleration valve 7 arranged along the length direction of the three-port piston cylinder 2 is inserted in the acceleration valve port 21, the upper end of the one-way acceleration valve 7 is a water outlet, the lower end of the one-way acceleration valve 7 is a water inlet, and an acceleration channel 71 connecting the water inlet and the water outlet is arranged in the one-way acceleration valve 7, and more than three acceleration units 711 are arranged in the acceleration channel 71 from top to bottom. In this embodiment, the acceleration channel 71 is provided with four acceleration units 711, and each acceleration unit 711 is composed of three parts: a first channel 7111, a second channel 7112, and an arc channel 7113. Among them, one end of the first channel 7111 and the second channel 7112 are connected to form an angle A, and the angle A satisfies 25°≤A≤80°. The angle A in this embodiment is 48°. One end of the arc channel 7113 is tangent to the end of the second channel 7112, and the other end of the arc channel 7113 is provided with a transition portion extending toward the first channel 7111, and the transition portion and the first channel 7111 directly form an angle B, and the angle B is 15°≤B≤90°. In this embodiment, the angle B is 18°. The front end of the first channel 7111 and the second channel 7112 of the acceleration unit 711 disposed at the bottom is connected to the end of the first channel 7111 disposed at the acceleration unit 711 above, so that the upper and lower acceleration units 711 are connected.

[0039] Furthermore, the motor 6 is a DC reduction motor 6, which is connected to the eccentric wheel 61 and drives the eccentric wheel 61 to rotate. A ring 31 is provided at the lower end of the push-pull rod 3. The shape and size of the ring 31 are consistent with the shape and size of the eccentric wheel 61. The ring 31 is sleeved on the eccentric wheel 61, so that the push-pull rod 3 reciprocates up and down with the rotation of the eccentric wheel 61.

[0040] Furthermore, in this embodiment, the motor 6 is connected to the eccentric wheel 61 through the adapter 62, and the motor 6 is arranged on one side of the housing 1 along a direction perpendicular to the water outlet direction of the water pump of the oral irrigator.

[0041] Furthermore, the acceleration valve includes a first valve body 72 and a second valve body 73 combined together, and grooves are respectively provided on the surfaces of the first valve body 72 and the second valve body 73 that are in contact with each other. The grooves on the first valve body 72 and the second valve body 73 correspond to each other to form an acceleration channel 71.

[0042] Furthermore, the shape of the water inlet interface 23 matches the shape of the water inlet connecting pipe 4, a limiting platform 231 is provided inside the water inlet interface 23, the limiting platform 231 abuts against the water inlet connecting pipe 4, a water inlet hole 232 is provided in the middle of the limiting platform 231, and a water outlet hole 41 corresponding to the water inlet hole 232 is provided on the surface where the water inlet connecting pipe 4 abuts against the limiting platform 231; a water stop groove 233 is provided in the middle of the limiting platform 231 along the edge of the water inlet hole 232, and a one-way water stop valve plate 233 is provided between the limiting platform 231 and the water inlet connecting pipe 4 4. The one-way water stop valve plate 234 includes an annular fixing portion 2341 and a water stop portion 2342. The annular water stop portion 2342 abuts against the limiting platform 231 and the water inlet connecting pipe 4. The water stop portion 2342 is arranged in the middle of the annular fixing portion 2341 opposite to the water outlet hole 41 and one end is connected to the annular fixing portion 2341. The size of the water stop groove 233 is larger than that of the water stop portion 2342. The water stop portion 2342 covers the water outlet hole 41 and can be opened in the direction of the water stop groove 233, so that water can flow out of the water outlet hole 41.

[0043] Since the water pump frequency of the water flosser is very high, the one-way water stop valve plate 234 needs to be repeatedly opened and closed at high speed when in use, and the position where the water stop portion 2342 is connected to the annular water stop portion 2342 is easily deformed or cracked due to high-intensity use. To avoid this situation, a return spring 235 is provided between the water stop groove 233 and the water stop portion 2342 in this embodiment, and the first end 2351 of the return spring 235 abuts against the groove bottom of the water stop groove 233, and the second end 2352 of the return spring 235 abuts against the water stop portion 2342. Due to the difference in size between the water stop groove 233 and the water stop portion 2342, in order to make the return spring 235 more stable for the return effect of the water stop portion 2342, the diameter of the return spring 235 gradually decreases from the first end 2351 to the second end 2352, so that the size of the first end 2351 is consistent with the size of the water stop groove 233, and the size of the second end 2352 is consistent with the size of the water stop portion 2342.

[0044] Furthermore, the housing 1 includes a first shell 11 and a second shell 12 combined together. The first shell 11 is provided with a motor fixing cavity 111 for fixing the motor 6 and a pipe fixing cavity 112 for fixing the water inlet connecting pipe 4. The pipe fixing cavity 112 is arranged above the motor fixing cavity 111.

[0045] Furthermore, a limiting block 121 for limiting the three-port piston cylinder 2 is provided in the middle of the second housing 12 , and the limiting block 121 is arranged at a position opposite to the pipe fixing cavity 112 .

[0046] Furthermore, a hook 122 and a limit block 123 are provided on the outer surface of the second shell 12 for facilitating installation of a PCBA board of the oral irrigator.

[0047] The water pump for the oral irrigator of the present invention is designed with a special acceleration valve based on the principle of the Tesla valve, which can increase the flow rate of the liquid passing through the acceleration valve, so that the liquid can be pumped out at the same speed through the water pump with less power, which provides the possibility of improving the existing power source of the water pump and creates space for reducing the pump body; due to the presence of the acceleration valve, the water pump for the oral irrigator of the present invention uses a reduction motor as the power source of the water pump, and the reduction motor can be used to drive the push-pull rod of the piston. There is no need to adopt the existing design of using helical gears to reduce the speed of the motor. The helical gears are removed, thereby eliminating a large amount of noise generated by the helical gears during operation, so that the water pump has less noise and lower vibration during overall operation, which can significantly improve the user experience.

Claims

1. A water pump for a water flosser, characterized in that: The utility model comprises a shell, a three-port piston cylinder, a push-pull rod, a water inlet connecting pipe, a piston and a motor, wherein the three-port piston cylinder is arranged above the motor, and the water inlet connecting pipe is arranged at a position corresponding to the middle part of the three-port piston cylinder; the upper end of the three-port piston cylinder is an acceleration valve port, and a one-way acceleration valve arranged along the length direction of the three-port piston cylinder is inserted in the acceleration valve port, the upper end of the one-way acceleration valve is a water outlet, and the lower end of the one-way acceleration valve is a water inlet, and an acceleration channel connecting the water inlet and the water outlet is arranged in the one-way acceleration valve, and the acceleration channel is provided with more than three acceleration units from top to bottom, and the acceleration unit comprises a first channel, a second channel and an arc channel, the front ends of the first channel and the second channel are connected and form an angle A, and the angle A satisfies 25°≤A≤80°, one end of the arc channel is tangent to the end of the second channel, and the other end of the arc channel is provided with a transition part extending to the first channel, and the transition part directly forms an angle B with the first channel, and the angle B Satisfying 15°≤B≤90°; the front end where the first channel and the second channel of the lower acceleration unit are connected is connected to the end of the first channel of the upper acceleration unit; The lower end of the three-port piston cylinder is a piston port, the piston is arranged in the three-port piston cylinder above the piston port, one end of the push-pull rod extends from the piston port into the three-port piston cylinder and is connected to the piston, and the other end of the push-pull rod is connected to the motor; the motor is a DC reduction motor, the motor is connected to the eccentric wheel and drives the eccentric wheel to rotate, the lower end of the push-pull rod is provided with a collar, the shape and size of the collar match the shape and size of the eccentric wheel, the collar is sleeved on the eccentric wheel, so that the push-pull rod reciprocates up and down with the rotation of the eccentric wheel; The one-way acceleration valve comprises a first valve body and a second valve body which are sealed and matched with each other, grooves are respectively arranged on the surfaces of the first valve body and the second valve body which are in contact with each other, and the grooves on the first valve body and the second valve body correspond to each other to form the acceleration channel; The opening in the middle of the three-port piston cylinder is provided with a water inlet interface, the shape of the water inlet interface is consistent with the shape of the water inlet connecting pipe, a limiting platform is provided in the water inlet interface, the limiting platform abuts the water inlet connecting pipe, a water inlet hole is provided in the middle of the limiting platform, and a water outlet hole corresponding to the water inlet hole is provided on the surface where the water inlet connecting pipe abuts with the limiting platform; a water stop groove is provided in the middle of the limiting platform along the edge of the water inlet hole, a one-way water stop valve plate is provided between the limiting platform and the water inlet connecting pipe, the one-way water stop valve plate includes an annular fixing part and an annular water stop part, the annular water stop part abuts the limiting platform and the water inlet connecting pipe, the annular water stop part is arranged in the middle of the annular fixing part opposite to the water outlet hole and one end is connected to the annular fixing part, the size of the water stop groove is larger than the size of the annular water stop part, the annular water stop part covers the water outlet hole and can be opened in the direction of the water stop groove.

2. The water pump for oral irrigator as claimed in claim 1, characterized in that: The angle A is 48°, and the angle B is 18°.

3. The water pump for a water flosser as claimed in claim 1, characterized in that: The motor is connected to the eccentric wheel through an adapter, and the motor is arranged on one side of the housing along a direction perpendicular or parallel to the water outlet direction of the water pump of the oral irrigator.

4. The water pump for water flosser according to claim 1, characterized in that: A return spring is provided between the water stop groove and the water stop portion, the first end of the return spring abuts against the bottom of the water stop groove, the second end of the return spring abuts against the annular water stop portion, the size of the first end of the return spring matches the size of the water stop groove, and the size of the second end matches the size of the annular water stop portion.

5. The water pump for oral irrigator as claimed in claim 1, characterized in that: The housing comprises a first shell and a second shell combined together, the first shell is provided with a motor fixing cavity for fixing the motor and a pipe fixing cavity for fixing the water inlet connecting pipe, and the pipe fixing cavity is arranged above the motor fixing cavity.

6. The water pump for a water flosser as claimed in claim 5, characterized in that: A limiting block for limiting the three-port piston cylinder is provided in the middle of the second shell, and the limiting block is arranged at a position opposite to the pipe fixing cavity.

7. The water pump for a water flosser as claimed in claim 5, characterized in that: A hook and a stop block are provided on the outer surface of the second shell for facilitating installation of a PCBA board of the oral flusher.

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