阅读说明：本技术 一种冲牙器用水泵 (Water pump for tooth flushing device ) 是由 宋家伟 宋光荣 宋嘉豪 宋婉祯 于 2021-02-09 设计创作，主要内容包括：本发明公开一种冲牙器用水泵,包括外壳、三口活塞筒、推拉杆、进水连通管、活塞和电机；所述三口活塞筒的上端为加速阀口,所述三口活塞的下端为活塞口,所述三口活塞筒的中部设有进水接口,所述加速阀口中插装有一个沿着三口活塞筒长度方向设置的单向加速阀。本发明的冲牙器用水泵根据特斯拉阀的原理,设计了特制的单向加速阀,能够提高经过加速阀的液体的流速,使得经过水泵能够用更小的动力将液体以相同的速度泵出,给水泵改进现有动力源提供了可能性,给缩小泵体创造了空间；由于有加速阀的存在,去掉了螺旋齿轮,使得水泵整体运行时噪音更小,振动也更低,能够显著的提升用户的使用体验。(The invention discloses a water pump for a tooth flushing device, which comprises a shell, a three-opening piston cylinder, a push-pull rod, a water inlet communicating pipe, a piston and a motor, wherein the three-opening piston cylinder is arranged on the shell; the upper end of the three-port piston cylinder is provided with an acceleration valve port, the lower end of the three-port piston is provided with 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. According to the water pump for the tooth flusher, the special one-way accelerating valve is designed according to the principle of the Tesla valve, so that the flow rate of liquid passing through the accelerating valve can be improved, the liquid can be pumped out at the same speed by smaller power through the water pump, the possibility is provided for the water pump to improve the existing power source, and a space is created for reducing a pump body; due to the existence of the accelerating valve, the spiral gear is removed, so that the noise is lower when the water pump integrally operates, the vibration is lower, and the use experience of a user can be obviously improved.)

1. A water pump for a tooth flushing device is characterized by comprising a shell (1), a three-port piston cylinder (2), a push-pull rod (3), a water inlet communicating pipe (4), a piston (5) and a motor (6), wherein the three-port piston cylinder (2) is arranged above the motor (6), and the water inlet communicating pipe (4) is arranged at a position corresponding to the middle of the three-port piston cylinder (2); the acceleration valve comprises a three-port piston cylinder (2), wherein the upper end of the three-port piston cylinder (2) is an acceleration valve port (21), a one-way acceleration valve (7) arranged along the length direction of the three-port piston cylinder (2) is inserted into 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, an acceleration channel (71) communicated with the water inlet and the water outlet is arranged in the one-way acceleration valve (7), the acceleration channel (71) is provided with more than three acceleration units (711) from top to bottom, each acceleration unit (711) comprises a first channel (7111), a second channel (7112) and an arc-shaped channel (7113), the front ends of the first channel (7111) and the second channel (7112) are connected to form an included angle A which is not less than 25 degrees and not more than 80 degrees, one end of the arc-shaped channel (7113) is tangent to the tail, the other end of the arc-shaped channel (7113) is provided with a transition part extending towards the first channel (7111), the transition part and the first channel (7111) directly form an included angle B, and the included angle B is more than or equal to 15 degrees and less than or equal to 90 degrees; the front end of the lower acceleration unit (711) where the first channel (7111) and the second channel (7112) are connected is connected to the end of the upper acceleration unit (711) where the first channel (7111) is connected.

2. The water pump for a dental irrigator of claim 1 wherein said angle a is 48 ° and said angle B is 18 °.

3. The water pump for the tooth flushing device according to claim 1, wherein the lower end of the three-port piston cylinder (2) is provided with a piston port (22), the piston (5) is arranged in the three-port piston cylinder (2) above the piston port (22), one end of the push-pull rod (3) extends into the three-port piston cylinder (2) from the piston port (22) to be connected with the piston (5), and the other end of the push-pull rod (3) is connected with the motor (6); the motor (6) is a direct-current speed reduction motor (6), the motor (6) is connected with an eccentric wheel (61) and drives the eccentric wheel (61) to rotate, a lantern ring (31) is arranged at the lower end of the push-pull rod (3), the shape and size of the lantern ring (31) are matched with those of the eccentric wheel (61), and the lantern ring (31) is sleeved on the eccentric wheel (61) so that the push-pull rod (3) can reciprocate up and down along with the rotation of the eccentric wheel (61).

4. The pump for dental irrigators according to claim 3, wherein said motor (6) is connected to said eccentric (61) by means of an adapter, said motor (6) being arranged on one side of said housing (1) in a direction perpendicular or parallel to the direction in which said dental irrigator pumps water.

5. The water pump for the tooth punching device according to claim 1, characterized in that the one-way acceleration valve (7) comprises a first valve body (72) and a second valve body (73) which are in sealing fit with each other, grooves are respectively arranged on the surfaces of the first valve body (72) and the second valve body (73) which are attached to each other, and the grooves on the first valve body (72) and the second valve body (73) correspond to each other to form the acceleration channel (71).

6. The water pump for the tooth flushing device according to claim 1, wherein the shape of the water inlet connector (23) is matched with that of the water inlet communicating pipe (4), a limiting platform (231) is arranged in the water inlet connector (23), the limiting platform (231) is abutted with the water inlet communicating pipe (4), a water inlet hole (232) is formed in the middle of the limiting platform (231), and a water outlet hole (41) corresponding to the water inlet hole (232) is formed in the abutted surface of the water inlet communicating pipe (4) and the limiting platform (231); spacing platform (231) middle part is along the edge of inlet opening (232) is equipped with stagnant water recess (233), be equipped with one-way stagnant water valve block (234) between spacing platform (231) and the communicating pipe of intaking (4), one-way stagnant water valve block (234) are including annular fixed part (2341) and stagnant water portion (2342), annular stagnant water portion (2342) and spacing platform (231) and intake communicating pipe (4) butt, stagnant water portion (2342) set up with apopore (41) are relative annular fixed part (2341) middle and one end are connected with annular fixed part (2341), the size of stagnant water recess (233) is greater than the size of stagnant water portion (2342), stagnant water portion (2342) cover on apopore (41) and can open to stagnant water recess (233) place direction.

7. The water pump for the tooth flushing device as claimed in claim 6, wherein a return spring (235) is arranged between the water stopping groove (233) and the water stopping part (2342), a first end (2351) of the return spring (235) is abutted against the groove bottom of the water stopping groove (233), a second end (2352) of the return spring (235) is abutted against the water stopping part (2342), the size of the first end (2351) of the return spring (235) is matched with the size of the water stopping groove (233), and the size of the second end (2352) is matched with the size of the water stopping part (2342).

8. The water pump for the tooth flushing device according to claim 1, wherein the outer shell (1) comprises a first shell (11) and a second shell (12) which are combined together, a motor fixing cavity (111) for fixing the motor (6) and a connecting pipe fixing cavity (112) for fixing the water inlet communicating pipe (4) are arranged on the first shell (11), and the connecting pipe fixing cavity (112) is arranged above the motor fixing cavity (111).

9. The water pump for the tooth flusher according to claim 8, wherein a limiting fixture block (121) for limiting the three-port piston cylinder (2) is arranged in the middle of the second shell (12), and the limiting fixture block (121) is arranged at a position opposite to the connecting pipe fixing cavity (112).

10. The water pump for a dental irrigator according to claim 8, wherein the outer surface of the second housing (12) is provided with a catch (122) and a stopper (123) for facilitating mounting of a PCBA board of the dental irrigator.

Technical Field

The invention relates to the field of tooth cleaning equipment, in particular to a water pump for a tooth flushing device.

Background

Along with the improvement of the attention degree of people to oral health, particularly to tooth health, the tooth rinsing device becomes a popular tooth cleaning tool, has a good effect on cleaning teeth gaps, is convenient and efficient, has less damage to gums, is more environment-friendly, and gradually replaces the traditional tooth gap cleaning tool. The common tooth flusher has a portable type and a table type, wherein the portable type is more popular with users because of no limitation of connecting wires and using scenes. However, in order to ensure the portability of the tooth flushing device, the volume of the portable tooth flushing device is greatly limited, high requirements are provided for the design of each device inside the tooth flushing device, the existing water pump for the portable tooth flushing device utilizes a direct-current micro-motor to drive a helical gear to drive a piston to move for pumping water, the design limits the further reduction of the volume of the water pump, the noise is very large when the water pump is used, and the user experience is not good.

Disclosure of Invention

Aiming at the problems that the water pump for the tooth flushing device in the prior art pumps water by driving the spiral gear to drive the piston to move by the direct current micro motor, so that the pump body is large in size and large in noise, the invention provides the water pump for the tooth flushing device, wherein the specially-made accelerating valve is arranged on the water outlet hole of the water pump, so that the water outlet speed can be improved, the water outlet backflow can be greatly reduced, the size of the water pump can be designed to be smaller, the motor with lower power can be used, and the noise of the water pump is reduced.

The technical scheme adopted by the invention for solving the technical problems is as follows: a water pump for a tooth flushing device comprises a shell, a three-port piston cylinder, a push-pull rod, a water inlet communicating pipe, a piston and a motor, wherein the three-port piston cylinder is arranged above the motor, and the water inlet communicating 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 provided with an accelerating valve port, a one-way accelerating valve arranged along the length direction of the three-port piston cylinder is inserted in the accelerating valve port, the upper end of the one-way accelerating valve is a water outlet, the lower end of the one-way accelerating valve is a water inlet, an accelerating channel for communicating the water inlet and the water outlet is arranged in the one-way accelerating valve, the accelerating channel is provided with more than three accelerating units from top to bottom, the accelerating units comprise a first channel, a second channel and an arc-shaped channel, the front ends of the first channel and the second channel are connected to form an included angle A, the included angle A is more than or equal to 25 degrees and less than or equal to 80 degrees, one end of the arc-shaped channel is tangent to the tail end of the second channel, the other end of the arc-shaped channel is provided with a transition part extending to the first channel, the transition part and the first channel directly form an included angle B, and the included angle B is more than or equal to 15 degrees and less than or equal to 90 degrees; the front end of the lower accelerating unit, which is connected with the first channel and the second channel, is connected with the tail end of the first channel of the upper accelerating unit.

The technical scheme adopted by the invention for solving the technical problem further comprises the following steps:

according to the water pump for the tooth flushing device, the included angle A is 48 degrees, and the included angle B is 18 degrees.

According to the water pump for the tooth flushing device, the lower end of the three-opening piston cylinder is provided with the piston opening, the piston is arranged in the three-opening piston cylinder above the piston opening, one end of the push-pull rod extends into the three-opening piston cylinder from the piston opening to be connected with the piston, and the other end of the push-pull rod is connected with the motor; the motor is a direct-current speed reduction motor, the motor is connected with the eccentric wheel and drives the eccentric wheel to rotate, a lantern ring is arranged at the lower end of the push-pull rod, the shape and the size of the lantern ring are matched with those of the eccentric wheel, and the lantern ring is sleeved on the eccentric wheel, so that the push-pull rod can reciprocate up and down along with the rotation of the eccentric wheel.

The water pump for the tooth flushing device is characterized in that the motor is connected with the eccentric wheel through the adapter, and the motor is arranged on one side of the shell along the direction perpendicular to or parallel to the water pumping direction of the water pump for the tooth flushing device.

The water pump for the tooth flushing device comprises a first valve body and a second valve body which are in sealing fit with each other, grooves are respectively formed in the surfaces, attached to each other, of the first valve body and the second valve body, and the grooves in the first valve body and the grooves in the second valve body correspond to each other to form the accelerating channel.

According to the water pump for the tooth flushing device, the shape of the water inlet interface is matched with that of the water inlet communicating pipe, the water inlet interface is internally provided with the limiting platform, the limiting platform is abutted to the water inlet communicating pipe, the middle part of the limiting platform is provided with the water inlet hole, and the abutted surface of the water inlet communicating pipe and the limiting platform is provided with the water outlet hole corresponding to the water inlet hole; spacing platform middle part along the edge of inlet opening is equipped with the stagnant water recess, spacing platform and intake are equipped with an one-way stagnant water valve block between communicating pipe, one-way stagnant water valve block includes annular fixed part and stagnant water portion, annular stagnant water portion and spacing platform and intake communicating pipe butt, stagnant water portion set up with the apopore is relative in the middle of the annular fixed part and one end are connected with annular fixed part, the size of stagnant water recess is greater than the size of stagnant water portion, stagnant water portion covers on the apopore and can open to stagnant water recess place direction.

The water pump for the tooth flushing device is characterized in that a return spring is arranged between the water stopping groove and the water stopping part, the first end of the return spring is abutted against the bottom of the water stopping groove, the second end of the return spring is abutted against the water stopping part, the size of the first end of the return spring is matched with that of the water stopping groove, and the size of the second end is matched with that of the water stopping part.

The water pump for the tooth flushing device comprises a first shell and a second shell which are combined together, wherein a motor fixing cavity for fixing the motor and a connecting pipe fixing cavity for fixing the water inlet communicating pipe are arranged on the first shell, and the connecting pipe fixing cavity is arranged above the motor fixing cavity.

According to the water pump for the tooth flushing device, the middle part of the second shell is provided with the limiting clamping block for limiting the three-opening piston cylinder, and the limiting clamping block is arranged at the position opposite to the connecting pipe fixing cavity.

According to the water pump for the tooth flushing device, the outer surface of the second shell is provided with the clamping hook and the limiting block, and the clamping hook and the limiting block are convenient for installing the PCBA board of the tooth flushing device.

The invention has the beneficial effects that: according to the water pump for the tooth flushing device, the specially-made accelerating valve is designed according to the principle of the Tesla valve, so that the flow rate of liquid passing through the accelerating valve can be improved, the liquid can be pumped out at the same speed by using smaller power through the water pump, the possibility is provided for the water pump to improve the conventional power source, and a space is created for reducing a pump body; due to the existence of the accelerating valve, the water pump for the tooth flushing device utilizes the speed reducing motor as a power source of the water pump, the speed reducing motor can be used for driving a push-pull rod of the piston, the existing design of reducing the speed of the motor by utilizing a helical gear is not needed, and the helical gear is removed, so that a large amount of noise generated when the helical gear operates is eliminated, the noise is lower when the water pump integrally operates, the vibration is lower, and the use experience of a user can be obviously improved.

The invention will be further described with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is a schematic structural view of a first embodiment of a water pump for a dental irrigator according to the present invention;

FIG. 2 is a schematic cross-sectional view taken along line CC;

FIG. 3 is an exploded view of a first embodiment of the water pump for a dental irrigator of the present invention;

FIG. 4 is a schematic structural diagram of a first valve body of an accelerating valve in a first embodiment of a water pump for a dental irrigator according to the invention;

FIG. 5 is a schematic perspective view of a second embodiment of the water pump for a dental irrigator according to the present invention;

FIG. 6 is a schematic cross-sectional view taken along line DD;

FIG. 7 is an exploded view of a second embodiment of the water pump for a dental irrigator of the present invention;

in the figure, 1, a housing, 11, a first housing, 111, a motor fixing cavity, 112, a connecting pipe fixing cavity, 12, a second housing, 121, a limiting fixture block, 2, a three-port piston cylinder, 21, an accelerating valve port, 22, a piston port, 23, a water inlet interface, 231, a limiting platform, 232, a water inlet hole, 233, a water stopping groove, 234, a one-way water stopping valve sheet, 2341, an annular fixing part, 2342, a water stopping part, 235, a return spring, 2351, a first end, 2352, a second end, 3, a push-pull rod, 31, a collar, 4, a water inlet communicating pipe, 41, a water outlet hole, 5, a piston, 6, a motor, 61, an eccentric wheel, 7, a one-way accelerating valve, 71, an accelerating channel, 711, an accelerating unit, 7111, a first channel, 7112, a second channel, 7113, an arc channel, 72, a first valve body, 73, and a second valve body.

Detailed Description

The present embodiment is a preferred embodiment of the present invention, and other principles and basic structures that are the same as or similar to the present embodiment are within the scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically defined otherwise.

The first embodiment of the water pump for the tooth flusher is shown in figures 1-4 and comprises a shell 1, a three-opening piston cylinder 2, a push-pull rod 3, a water inlet communicating pipe 4, a piston 5 and a motor 6. Be equipped with fixed motor 6, three mouthful of piston barrels 2 and the installation position of intaking communicating pipe 4 on the shell 1 respectively, in this embodiment, in order to cooperate the design of the tooth ware of dashing to go up water, three mouthful of piston barrels 2 set up in the top of motor 6, intake communicating pipe 4 sets up the position that corresponds with three mouthful of piston barrels 2 middle parts. The housing 1 includes a first housing 11 and a second housing 12 combined together, the mounting position is a motor fixing cavity 111 and a connecting pipe fixing cavity 112 arranged on the first housing 11, the connecting pipe fixing cavity 112 is arranged at a position corresponding to the middle of the first housing 11 and the middle of the three-port piston cylinder 2, and is above the motor fixing cavity 111. The motor 6 is arranged in the motor fixing cavity 111, the water inlet communicating pipe 4 is arranged in the connecting pipe fixing cavity 112, and a communicating port for the water inlet communicating pipe 4 to extend outwards is arranged in the connecting pipe fixing cavity 112.

In this embodiment, the three-port piston cylinder 2 is provided with an upper opening, a middle opening and a lower opening, the opening at the upper end is the acceleration valve port 21, the opening at the lower end of the three-port piston 5 is the piston port 22, the opening at the middle part of the three-port piston cylinder 2 is the water inlet port 23, and the water inlet port 23 is communicated with the water inlet communicating pipe 4 arranged at the corresponding position. The piston 5 is arranged in the three-port piston cylinder 2 between the water inlet port 23 and the piston port 22, one end of the push-pull rod 3 extends into the three-port piston cylinder 2 from the piston port 22 to be connected with the piston 5, the other end of the push-pull rod 3 is connected with 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. In this embodiment, the motor 6 is a dc speed-reducing motor 6, the motor 6 is connected with 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 lantern ring 31, the shape and size of the lantern ring 31 are matched with the shape and size of the eccentric wheel 61, and the lantern ring 31 is sleeved on the eccentric wheel 61, so that the push-pull rod 3 reciprocates up and down along with the rotation of the eccentric wheel 61 to drive the piston 5 to move. The one-way accelerating valve 7 arranged along the length direction of the three-port piston cylinder 2 is inserted into the accelerating valve port 21, the upper end of the one-way accelerating valve 7 is a water outlet, the lower end of the one-way accelerating valve 7 is a water inlet, an accelerating channel 71 communicating the water inlet and the water outlet is arranged in the one-way accelerating valve 7, and more than three accelerating units 711 are arranged in the accelerating channel 71 from top to bottom. In this embodiment, the acceleration passage 71 is provided with four acceleration units 711, and each acceleration unit 711 is composed of three parts, namely a first passage 7111, a second passage 7112 and an arc-shaped passage 7113. Wherein, one end of the first channel 7111 and one end of the second channel 7112 are connected to form an included angle a, the included angle a is equal to or larger than 25 degrees and equal to or smaller than 80 degrees, and the included angle a in this embodiment is equal to or larger than 48 degrees. One end of the arc-shaped channel 7113 is tangent to the end of the second channel 7112, the other end of the arc-shaped channel 7113 is provided with a transition part extending to the first channel 7111, the transition part and the first channel 7111 directly form an included angle B, the included angle B is more than or equal to 15 degrees and less than or equal to 90 degrees, and the included angle B is 18 degrees in the embodiment. The front end of the connection of the first channel 7111 and the second channel 7112 of the lower acceleration unit 711 is connected to the end of the first channel 7111 of the upper acceleration unit 711, so that the upper and lower acceleration units 711 communicate.

The motor 6 is connected to the eccentric 61 via an adapter 62, and the motor 6 is disposed on one side of the housing 1 in a direction perpendicular to or parallel to the pumping direction of the water from the water pump of the dental irrigator, and in this embodiment, the motor 6 is disposed in the motor fixing cavity 111 of the first housing 11 in a direction parallel to the pumping direction of the water from the water pump of the dental irrigator.

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 that are combined together, grooves are respectively provided on the surfaces of the first valve body 72 and the second valve body 73 that are attached to each other, and the grooves on the first valve body 72 and the second valve body 73 correspond to each other to form the acceleration channel 71.

Since the motor 6 pushes the piston 5 upwards to push out the water in the three-port piston cylinder 2, the water will be pushed out again from the water inlet port 23, which will affect the water pumping efficiency of the water pump, therefore, in this embodiment, the water inlet port 23 is provided with corresponding structures and parts to prevent the water coming in from the water inlet port 23 from being pumped out again. In order to ensure the tightness between the water inlet connector 23 and the water inlet communicating pipe 4, the shape of the water inlet connector 23 is matched with that of the water inlet communicating pipe 4, a limiting platform 231 is arranged in the water inlet connector 23, the limiting platform 231 is abutted against the water inlet communicating pipe 4, and the water inlet communicating pipe 4 is limited from entering the three-port piston cylinder 2 from the water inlet connector 23. The middle part of the limiting platform 231 is provided with a water inlet 232, and the surface of the water inlet communicating pipe 4 abutted against the limiting platform 231 is provided with a water outlet 41 corresponding to the water inlet 232, so that water can enter the three-port piston cylinder 2 from the water inlet communicating pipe 4. The middle part of the limiting platform 231 is provided with a water stopping groove 233 along the edge of the water inlet 232, and a one-way water stopping valve plate 234 is arranged between the limiting platform 231 and the water inlet communicating pipe 4. The one-way water stop valve plate 234 comprises an annular fixing part 2341 and a water stop part 2342, the size of the annular water stop part 2342 is larger than that of the water stop groove 233, and the annular water stop part 2342 is abutted against the limiting platform 231 and the water inlet communicating pipe 4, so that the one-way water stop and water distributing plate 234 is fixed between the limiting platform 231 and the water inlet communicating pipe 4; stagnant water portion 2342 sets up in the middle of the annular fixed part 2341 relative with apopore 41 and one end is connected with annular fixed part 2341, and the size of stagnant water recess 233 is greater than stagnant water portion 2342's size, and stagnant water portion 2342 covers on apopore 41 and can open to stagnant water recess 233 place direction for rivers can flow out from apopore 41.

Since the frequency of a water pump of the water flushing device is high, the one-way water stop valve plate 234 needs to be repeatedly opened and closed at a high speed when the water flushing device is used, and the position where the water stopping part 2342 is connected with the annular water stopping part 2342 is easily deformed or cracked due to high-strength use. In order to avoid this, in the present embodiment, the return spring 235 is provided between the water stopping groove 233 and the water stopping portion 2342, the first end 2351 of the return spring 235 abuts against the bottom of the water stopping groove 233, and the second end 2352 of the return spring 235 abuts against the water stopping portion 2342. By the size difference with between stagnant water recess 233 and stagnant water portion 2342, for make reset spring 235 more stable to stagnant water portion 2342's effect that resets, the diameter of reset spring 235 reduces from first end 2351 to second end 2352 gradually for the size of first end 2351 is identical with stagnant water recess 233's size, and the size of second end 2352 is identical with stagnant water portion 2342's size.

In order to avoid the displacement of the three-port piston cylinder 2 due to the reciprocating motion of the piston 5 or the excessive pressure between the upper water outlet and the nozzle of the tooth flushing device, in this embodiment, the middle part of the second housing 12 is provided with a limiting fixture block 121 for limiting the three-port piston cylinder 2, and the limiting fixture block 121 is arranged at a position opposite to the connecting pipe fixing cavity 112. In this embodiment, an upward side of the limiting block 121 is a plane perpendicular to the inner wall of the second housing 12, and a downward side of the limiting block 121 is an inclined plane.

In order to facilitate the installation of the PCBA board during the assembly of the tooth flushing device, the outer surface of the second shell 12 is provided with a hook 122 and a stop block 123 for facilitating the installation of the PCBA board of the tooth flushing device.

When the tooth flushing device operates, the PCBA board of the control motor 6 receives a signal, the control motor 6 is started, and the push-pull rod 3 pushes the piston 5 to start reciprocating motion in the three-opening piston cylinder 2. When the piston 5 moves downward, water pushes away the water stopping part 2342 of the one-way water stopping valve plate 234 from the water outlet hole 41 of the water inlet communicating pipe 4 due to the pressure, and enters the three-port piston cylinder 2. Meanwhile, water or air in the one-way acceleration valve 7 also enters the three-port piston cylinder 2 under the action of pressure, but is split 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 fluid continues to flow downwards along the first channel 7111, the second part of fluid flows downwards along the second channel 7112 and enters the arc-shaped channel 7113, the flow direction is changed to be almost opposite to that of the first part of fluid by the arc-shaped channel 7113, then the first part of fluid is merged at the junction of the arc-shaped channel 7113 and the first channel 7111, and the flow of the first part of fluid is blocked due to the opposite flow direction, so that only a small amount of the first part of fluid can enter the second acceleration unit 711, and then the fluid continues to be reduced to almost no fluid passes through the one-way acceleration valve 7 due to the structure of the second acceleration unit 711. When the piston 5 moves upwards, water is squeezed outwards from the three-port piston cylinder 2 by the piston 5, the water stopping part 2342 is pushed to cover the water outlet hole 41, and therefore the water cannot flow outwards from the water inlet communicating pipe 4 and only can flow upwards from the one-way accelerating 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 divided by the arc-shaped channel 7113, and most of the water flows upwards directly along the first channel 7111, and after passing through the second channel 7112, the flow direction of the part divided by the arc-shaped channel 7113 becomes similar to that of the part flowing along the first channel 711, so that an acceleration can be given to the part flowing along the first channel 711, the flow rate of the water is faster, and the water outlet speed of the water pump for the tooth flushing device is higher and the pressure is higher after repeated acceleration of the plurality of acceleration units 711.

The second embodiment of the water pump for the tooth flusher is shown in figures 5-7 and comprises a shell 1, a three-port piston cylinder 2, a push-pull rod 3, a water inlet communicating pipe 4, a piston 5 and a motor 6, wherein the shell 1 is respectively provided with a mounting position for fixing the motor 6, the three-port piston cylinder 2 and the water inlet communicating pipe 4. The three-port piston cylinder 2 is arranged above the motor 6, and the water inlet communicating pipe 4 is arranged at a position corresponding to the middle part of the three-port piston cylinder 2. The upper end of the three-port piston cylinder 2 is provided with an accelerating valve port 21, the lower end of the three-port piston 5 is provided with a piston port 22, the middle part of the three-port piston cylinder 2 is provided with a water inlet connector 23, a water inlet communicating pipe 4 is communicated with the water inlet connector 23, the piston 5 is arranged in the three-port piston cylinder 2 between the water inlet connector 23 and the piston port 22, one end of a push-pull rod 3 extends into the three-port piston cylinder 2 from the piston port 22 to be connected with the piston 5, the other end of the push-pull rod 3 is connected with a motor 6, and the motor 6 drives the piston 5 to reciprocate in the three-port piston cylinder 2 through the push. The one-way accelerating valve 7 arranged along the length direction of the three-port piston cylinder 2 is inserted into the accelerating valve port 21, the upper end of the one-way accelerating valve 7 is a water outlet, the lower end of the one-way accelerating valve 7 is a water inlet, an accelerating channel 71 communicating the water inlet and the water outlet is arranged in the one-way accelerating valve 7, and more than three accelerating units 711 are arranged in the accelerating channel 71 from top to bottom. In this embodiment, the acceleration passage 71 is provided with four acceleration units 711, and each acceleration unit 711 is composed of three parts, namely a first passage 7111, a second passage 7112 and an arc-shaped passage 7113. Wherein, one end of the first channel 7111 and one end of the second channel 7112 are connected to form an included angle a, the included angle a is equal to or larger than 25 degrees and equal to or smaller than 80 degrees, and the included angle a in this embodiment is equal to or larger than 48 degrees. One end of the arc-shaped channel 7113 is tangent to the end of the second channel 7112, the other end of the arc-shaped channel 7113 is provided with a transition part extending to the first channel 7111, the transition part and the first channel 7111 directly form an included angle B, the included angle B is more than or equal to 15 degrees and less than or equal to 90 degrees, and the included angle B is 18 degrees in the embodiment. The front end of the connection of the first channel 7111 and the second channel 7112 of the lower acceleration unit 711 is connected to the end of the first channel 7111 of the upper acceleration unit 711, so that the upper and lower acceleration units 711 communicate.

Further, the motor 6 is a direct current speed reduction motor 6, the motor 6 is connected with 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 lantern ring 31, the shape and the size of the lantern ring 31 are matched with those of the eccentric wheel 61, and the lantern ring 31 is sleeved on the eccentric wheel 61, so that the push-pull rod 3 can reciprocate up and down along with the rotation of the eccentric wheel 61.

Further, in the present embodiment, the motor 6 is connected to the eccentric wheel 61 through the adaptor 62, and the motor 6 is disposed at one side of the housing 1 in a direction perpendicular to a water pumping direction of the water pump for the dental irrigator.

Further, the accelerating valve comprises a first valve body 72 and a second valve body 73 which are combined together, grooves are respectively arranged on the surfaces, attached to each other, of the first valve body 72 and the second valve body 73, and the grooves on the first valve body 72 and the second valve body 73 correspond to each other to form an accelerating channel 71.

Further, the shape of the water inlet connector 23 is matched with that of the water inlet communicating pipe 4, a limiting platform 231 is arranged in the water inlet connector 23, the limiting platform 231 is abutted against the water inlet communicating pipe 4, a water inlet hole 232 is arranged in the middle of the limiting platform 231, and a water outlet hole 41 corresponding to the water inlet hole 232 is arranged on the abutted surface of the water inlet communicating pipe 4 and the limiting platform 231; spacing platform 231 middle part is equipped with stagnant water recess 233 along the edge of inlet opening 232, spacing platform 231 and intake are equipped with one-way stagnant water valve block 234 between communicating pipe 4, one-way stagnant water valve block 234 includes annular fixed part 2341 and stagnant water portion 2342, annular stagnant water portion 2342 and spacing platform 231 and intake communicating pipe 4 butt, stagnant water portion 2342 sets up in the middle of the annular fixed part 2341 relative with apopore 41 and one end is connected with annular fixed part 2341, stagnant water recess 233's size is greater than stagnant water portion 2342's size, stagnant water portion 2342 covers on apopore 41 and can open to stagnant water recess 233 place direction, rivers can follow apopore 41 and flow out.

Since the frequency of a water pump of the water flushing device is high, the one-way water stop valve plate 234 needs to be repeatedly opened and closed at a high speed when the water flushing device is used, and the position where the water stopping part 2342 is connected with the annular water stopping part 2342 is easily deformed or cracked due to high-strength use. In order to avoid this, in the present embodiment, the return spring 235 is provided between the water stopping groove 233 and the water stopping portion 2342, the first end 2351 of the return spring 235 abuts against the bottom of the water stopping groove 233, and the second end 2352 of the return spring 235 abuts against the water stopping portion 2342. By the size difference with between stagnant water recess 233 and stagnant water portion 2342, for make reset spring 235 more stable to stagnant water portion 2342's effect that resets, the diameter of reset spring 235 reduces from first end 2351 to second end 2352 gradually for the size of first end 2351 is identical with stagnant water recess 233's size, and the size of second end 2352 is identical with stagnant water portion 2342's size.

Further, the housing 1 includes a first housing 11 and a second housing 12 combined together, the first housing 11 is provided with a motor fixing chamber 111 for fixing the motor 6 and a connection pipe fixing chamber 112 for fixing the water inlet communication pipe 4, and the connection pipe fixing chamber 112 is disposed above the motor fixing chamber 111.

Further, a limiting fixture block 121 for limiting the three-port piston cylinder 2 is arranged in the middle of the second housing 12, and the limiting fixture block 121 is arranged at a position opposite to the connecting pipe fixing cavity 112.

Furthermore, the outer surface of the second housing 12 is provided with a hook 122 and a stopper 123 for conveniently mounting a PCBA board of the tooth flushing device.

According to the water pump for the tooth flushing device, the specially-made accelerating valve is designed according to the principle of the Tesla valve, so that the flow rate of liquid passing through the accelerating valve can be improved, the liquid can be pumped out at the same speed by using smaller power through the water pump, the possibility is provided for the water pump to improve the conventional power source, and a space is created for reducing a pump body; due to the existence of the accelerating valve, the water pump for the tooth flushing device utilizes the speed reducing motor as a power source of the water pump, the speed reducing motor can be used for driving a push-pull rod of the piston, the existing design of reducing the speed of the motor by utilizing a helical gear is not needed, and the helical gear is removed, so that a large amount of noise generated when the helical gear operates is eliminated, the noise is lower when the water pump integrally operates, the vibration is lower, and the use experience of a user can be obviously improved.