Water pump and oral care equipment

Abstract

The embodiment of the utility model provides a water pump and oral care equipment. The water pump comprises a pump shell and a rotor, and the pump shell is provided with a liquid inlet and a liquid outlet; the rotor comprises a driving part and a driven part which are connected with each other, the driving part and the driven part are both arranged in the pump shell, at least one capacity change cavity is formed among the driving part, the driven part and the inner wall of the pump shell, and the driving part or the driven part is further provided with a communicating part communicating with the capacity change cavity. The communicating part is used for periodically communicating with the liquid inlet or the liquid outlet in the rotating process of the rotor, so that when the volume change cavity communicates with the liquid outlet through the communicating part, the volume change cavity pumps liquid to the nozzle through the communicating part and the liquid outlet, and when the communicating part and the liquid outlet are arranged in a staggered mode, the liquid in the volume change cavity cannot be pumped to the nozzle; therefore, the liquid outlet amount of the nozzle can be reduced, use of liquid in the liquid storage tank is reduced, the size of the liquid storage tank can be reduced, the overall size of the oral care equipment is reduced, and a user can conveniently carry and use the oral care equipment.

Description

Technical Field

[0001] The present application relates to the technical field of oral care, and particularly relates to a water pump and an oral care device. Background Art

[0002] With the progress of society, users pay more and more attention to oral cleaning, and oral care devices are gradually entering thousands of households.

[0003] In related technologies, an oral care device may include a dental irrigator. The dental irrigator flushes the user's oral cavity by spraying pulsed water columns. However, due to the limited volume of the liquid storage tank built into the dental irrigator and the relatively large water output per pulse of the dental irrigator, the liquid in the liquid storage tank is consumed relatively quickly, affecting the user's oral cleaning. Summary of the Utility Model

[0004] The present application provides a water pump and an oral care device, which utilize a communication part to communicate with the liquid inlet or the liquid outlet periodically during the rotation of the rotor, so that when the variable volume chamber communicates with the liquid outlet through the communication part, the variable volume chamber pumps liquid to the nozzle through the communication part and the liquid outlet, thereby reducing the liquid output of the nozzle, reducing the use of the liquid in the liquid storage tank, and further increasing the user's usage time to improve the cleaning effect.

[0005] In a first aspect of an embodiment of the present application, a water pump is provided, which is applied to an oral care device. The water pump includes a pump housing and a rotor. The pump housing has a liquid inlet and a liquid outlet; the rotor includes a driving part and a driven part connected to each other. The driving part and the driven part are both arranged in the pump housing. At least one variable volume chamber is configured between the driving part, the driven part and the inner wall of the pump housing. The driving part or the driven part further has a communication part communicating with the variable volume chamber, and the communication part is used to communicate with the liquid inlet or the liquid outlet periodically during the rotation of the rotor.

[0006] Based on the above embodiment, during the rotation of the rotor, the communication part communicates with the liquid inlet or the liquid outlet periodically. When the extrusion force of the driving part and the driven part on the liquid is the largest and the variable volume chamber communicates with the liquid outlet through the communication part, the variable volume chamber can pump liquid to the nozzle through the communication part and the liquid outlet, thereby ensuring that the pressure of the liquid ejected from the nozzle is relatively large to ensure a better cleaning effect on the user's oral cavity; and when the extrusion force of the driving part and the driven part on the liquid is relatively small, the communication part is misaligned with the liquid outlet, and the liquid in the variable volume chamber will not be pumped to the nozzle, thereby reducing the liquid output of the nozzle, reducing the use of the liquid in the liquid storage tank, and further increasing the user's usage time to improve the cleaning effect. And the amount of liquid used in the liquid storage tank is less, which can reduce the volume of the liquid storage tank, reduce the overall volume of the oral care device, and facilitate the user to carry and use the oral care device.

[0007] Optionally, the water pump further includes a drive shaft connected to the active part. The pump housing includes a first housing and a second housing. The first housing has a liquid inlet and a liquid outlet. At least part of the driven part is disposed inside the first housing and is rotatably connected to the first housing. The second housing is connected to the first housing. The active part is disposed inside the second housing. The drive shaft extends out of the second housing from the active part so that the active part is rotatably connected to the second housing.

[0008] Based on the above embodiments, both the liquid inlet and the liquid outlet are disposed on the first housing, and the drive shaft passes through the second housing and is connected to the active part, so that the drive shaft and the liquid inlet and the liquid outlet can be respectively disposed on both sides of the pump housing, thereby reducing the influence of the drive shaft on the connecting pipelines of the liquid inlet and the liquid outlet, and improving the connection stability between the pipelines and the liquid inlet and between the pipelines and the liquid outlet. Furthermore, it is ensured that the water pump can pump the liquid in the liquid storage tank to the nozzle and spray it out through the nozzle to clean the user's oral cavity.

[0009] Optionally, the driven part has a bottom surface facing the active part. The bottom surface constitutes part of the cavity wall of the variable volume cavity. The driven part further has a spherical surface connected to the bottom surface and disposed away from the variable volume cavity. The communication part is a through hole that penetrates through the bottom surface and the spherical surface at both ends.

[0010] Based on the above embodiments, when the extrusion pressure of the active part and the driven part on the liquid is the greatest, the through hole communicates with the liquid outlet, and the liquid in the variable volume cavity can be pumped to the nozzle through the through hole and the liquid outlet to clean the user's oral cavity.

[0011] Optionally, the driven part has a bottom surface facing the active part. The bottom surface constitutes part of the cavity wall of the variable volume cavity. The driven part further has a spherical surface connected to the bottom surface and disposed away from the variable volume cavity. The communication part is a notch provided at the connection between the bottom surface and the spherical surface.

[0012] Based on the above embodiments, similarly, when the extrusion pressure of the active part and the driven part on the liquid is the greatest, the notch communicates with the liquid outlet, and the liquid in the variable volume cavity can be pumped to the nozzle through the notch and the liquid outlet to clean the user's oral cavity.

[0013] Optionally, the communication part is a notch provided at the connection between the bottom surface and the spherical surface, where the notch satisfies one of the following conditions:

[0014] Along the circumferential direction of the rotation of the driven part, the notch has a first circumferential length, and the variable volume cavity has a second circumferential length. The first circumferential length is not greater than 1 / 2 of the second circumferential length.

[0015] Along the axial direction of the rotation of the driven part, the notch has a first axial thickness, and the variable volume cavity has a second axial thickness. The first axial thickness is not greater than 1 / 2 of the second axial thickness.

[0016] The notch forms a bottom opening on the bottom surface, and the depth of the bottom opening does not exceed the rotational connection between the driven part and the driving part.

[0017] Based on the above embodiments, along the circumferential direction of rotation of the driven part, the first circumferential length is not greater than 1 / 2 of the second circumferential length. When the driving part drives the driven part to rotate, the time for the notch to communicate with the liquid outlet is short, so that the liquid output of the nozzle can be reduced, the use of the liquid in the liquid storage tank can be reduced, the liquid storage tank can be made smaller, and then the volume of the oral care device can be made smaller, which is convenient for carrying and using the oral care device. And it can ensure that the liquid ejected through the nozzle has a large pressure to improve the cleaning effect on the user's oral cavity. If the first circumferential length is greater than 1 / 2 of the second circumferential length, the size of the notch is large, resulting in a long communication time between the notch and the liquid outlet when the driving part drives the driven part to rotate, resulting in a large liquid output of the nozzle, resulting in a large amount of liquid used in the liquid storage tank, a large required volume of the liquid storage tank, a large liquid storage tank, a large volume of the oral care device, and inconvenience in carrying and using the oral care device. And because the communication time between the notch and the liquid outlet is long, the pressure of the liquid ejected from the nozzle will gradually decrease, resulting in a poor cleaning effect on the user's oral cavity.

[0018] Along the axial direction of rotation of the driven part, the first axial thickness is not greater than 1 / 2 of the second axial thickness; when the driving part drives the driven part to rotate, the notch is small, so that the liquid output of the nozzle can be reduced, the use of the liquid in the liquid storage tank can be reduced, the liquid storage tank can be made smaller, and then the volume of the oral care device can be made smaller, which is convenient for carrying and using the oral care device. And it can ensure that the liquid ejected through the nozzle has a large pressure to improve the cleaning effect on the user's oral cavity. If the first axial thickness is greater than 1 / 2 of the size of the second axial thickness; the size of the notch is large, resulting in a large liquid output of the nozzle when the driving part drives the driven part to rotate, resulting in a large amount of liquid used in the liquid storage tank, a large required volume of the liquid storage tank, a large liquid storage tank, a large volume of the oral care device, and inconvenience in carrying and using the oral care device. And because the notch is large, the pressure of the liquid ejected from the nozzle is small, resulting in a poor cleaning effect on the user's oral cavity.

[0019] The depth of the bottom opening does not exceed the rotational connection between the driven part and the driving part. Similarly, when the driving part drives the driven part to rotate, the liquid output of the nozzle can be reduced, the use of the liquid in the liquid storage tank can be reduced, the liquid storage tank can be made smaller, and then the volume of the oral care device can be made smaller, which is convenient for carrying and using the oral care device.

[0020] Optionally, the number of variable volume chambers is two, the number of communication parts is two, and the communication parts and the variable volume chambers are arranged in one-to-one correspondence.

[0021] Based on the above embodiments, the two communicating parts are arranged in one-to-one correspondence with the volume-variable chambers, so that during the process of the driving part driving the driven part to rotate by 180°, there is a volume-variable chamber communicating with the liquid outlet through the communicating part, so that the liquid in the volume-variable chamber can be pumped out, the liquid outlet efficiency of the water pump can be improved, and further the liquid outlet efficiency of the nozzle can be improved, so as to improve the cleaning efficiency of the oral care device for the user's oral cavity.

[0022] Optionally, along the circumferential direction of the rotation of the driven part, the communicating part is located in the middle of the volume-variable chamber communicating with the communicating part.

[0023] Based on the above embodiments, along the circumferential direction of the rotation of the driven part, the communicating part is located in the middle of the volume-variable chamber communicating with the communicating part. Compared with arranging the communicating part on one side of the volume-variable chamber, the water outlet pressure of the liquid outlet can be made larger, so that the cleaning effect of the oral care device on the user's oral cavity can be improved.

[0024] Optionally, the two communicating parts are arranged centrosymmetrically about the rotation axis of the driven part.

[0025] Based on the above embodiments, the two communicating parts are arranged centrosymmetrically about the rotation axis of the driven part, which can make the water outlet pressure of the liquid outlet larger, so that the cleaning effect of the oral care device on the user's oral cavity can be improved.

[0026] Optionally, the rotation axis of the driven part, the liquid inlet and the liquid outlet are transversely cut by the same reference plane.

[0027] Based on the above embodiments, the rotation axis of the driven part, the liquid inlet and the liquid outlet are transversely cut by the same reference plane, so that the flow rate of the liquid entering the volume-variable chamber through the liquid inlet is larger, and the pressure of the liquid flowing out of the volume-variable chamber to the nozzle through the liquid outlet is larger. Furthermore, the water pumping efficiency of the water pump can be improved, and the cleaning effect of the oral care device on the user's oral cavity can also be improved.

[0028] Optionally, the inner wall surface of the first housing has a liquid inlet channel communicating with the liquid inlet. When the liquid inlet channel communicates with the volume-variable chamber, the communicating part does not communicate with the liquid outlet. When the liquid inlet channel does not communicate with the volume-variable chamber, the communicating part communicates with the liquid outlet.

[0029] Based on the above embodiments, when the liquid inlet channel communicates with the volume-variable chamber, the communicating part does not communicate with the liquid outlet. When the liquid inlet channel does not communicate with the volume-variable chamber, the communicating part communicates with the liquid outlet, so that when the extrusion force of the driving part and the driven part on the liquid is small, and the communicating part and the liquid outlet are misaligned, the liquid in the volume-variable chamber can flow to the liquid inlet through the liquid inlet channel, so as to facilitate the continuous change of the volume of the volume-variable chamber, thus facilitating the driving part to drive the driven part to move, and facilitating the liquid to be ejected through the nozzle to clean the user's oral cavity.

[0030] Optionally, the inner wall surface of the first housing has a liquid outlet channel communicating with the liquid outlet. When the liquid inlet channel communicates with the variable volume chamber, the communicating part is not in communication with the liquid outlet channel. When the liquid inlet channel is not in communication with the variable volume chamber, the communicating part is in communication with the liquid outlet channel.

[0031] Based on the above embodiments, the liquid outlet channel facilitates the liquid in the variable volume chamber to enter the liquid inlet through the communicating part, and further facilitates the liquid to be ejected through the nozzle to clean the user's oral cavity.

[0032] Optionally, within a single rotation period of 180°, the driven part has a first rotation angle α and a second rotation angle β. Within the first rotation angle α, the liquid inlet channel is always in communication with the variable volume chamber. Within the second rotation angle β, the communicating part is always in communication with the liquid outlet channel, and the sum of the first rotation angle α and the second rotation angle β is equal to 180°.

[0033] Based on the above embodiments, when the extrusion force of the liquid by the driving part and the driven part is small and the communicating part and the liquid outlet are misaligned, the liquid in the variable volume chamber can flow to the liquid inlet through the liquid inlet channel, so as to facilitate the continuous change of the volume of the variable volume chamber, thereby facilitating the driving part to drive the driven part to move, and further facilitating the water pump to pump the liquid in the liquid storage tank to the nozzle to clean the user's oral cavity.

[0034] Optionally, the liquid inlet channel is an arc-shaped channel located on the inner wall surface of the first housing, and the arc-shaped channel is formed by the depression of the inner wall surface of the first housing.

[0035] Optionally, the arc-shaped channel extends along the rotation circumference of the driven part, and the arc-shaped channel includes a first arc segment and a second arc segment located on both sides of the liquid inlet, and the first arc segment and the second arc segment are axially symmetrically arranged with respect to the liquid inlet.

[0036] Based on the above embodiments, before the communicating part and the liquid outlet are conducted, the liquid in the variable volume chamber can flow back to the liquid inlet through the first arc segment; after the communicating part and the liquid outlet are conducted, the liquid in the variable volume chamber can flow back to the liquid inlet through the second arc segment, so as to facilitate the change of the volume of the variable volume chamber, thereby facilitating the water pump to pump the liquid in the liquid storage tank to the nozzle to clean the user's oral cavity.

[0037] Optionally, the number of the communicating parts is one, the driving part has a pressure relief groove communicating with the liquid inlet, the number of the variable volume chambers is two, one of the variable volume chambers is in communication with the communicating part, and the other variable volume chamber is in communication with the pressure relief groove.

[0038] Based on the above embodiments, the two variable volume chambers are respectively a first variable volume chamber and a second variable volume chamber. The first variable volume chamber is in communication with the communication portion, and the second variable volume chamber is kept in communication with the liquid inlet through the pressure relief groove. Thus, the first variable volume chamber can be used to pump liquid to the nozzle, which can further reduce the use of the liquid in the liquid storage tank, can reduce the volume of the liquid storage tank, so as to reduce the volume of the oral care device and facilitate the use and carrying of the oral care device. Moreover, when the extrusion force of the liquid by the active part and the driven part in the first variable volume chamber is small and the communication portion and the liquid outlet are arranged in a dislocation manner, the liquid in the first variable volume chamber can move to the second variable volume chamber through the liquid inlet channel and flow back to the liquid inlet through the pressure relief groove, so as to ensure that the active part can drive the driven part to move, so as to pump the liquid in the liquid storage tank to the nozzle, thereby cleaning the user's oral cavity.

[0039] Optionally, the first housing includes a first housing body, a liquid inlet pipe and a liquid outlet pipe. The first housing body has a liquid inlet and a liquid outlet. At least a part of the driven part is arranged inside the first housing body and is rotatably connected to the first housing body; the liquid inlet pipe is connected to the first housing body and is in communication with the liquid inlet; the liquid outlet pipe is connected to the first housing body and is in communication with the liquid outlet; wherein, the liquid inlet pipe and the liquid outlet pipe are arranged on both sides of the first housing body and form an included angle.

[0040] Based on the above embodiments, the liquid inlet pipe and the liquid outlet pipe are arranged on both sides of the first housing body and form an included angle, so as to facilitate the connection of the liquid inlet pipeline with the liquid inlet pipe and the liquid storage tank, and also facilitate the connection of the liquid outlet pipeline with the liquid outlet pipe and the nozzle, and can reduce the probability of interference between the liquid inlet pipeline and the liquid outlet pipeline, so as to improve the installation stability of the liquid inlet pipeline and the liquid outlet pipeline, so as to ensure that the water pump can pump the liquid in the liquid storage tank to the nozzle and spray it out through the nozzle to clean the user's oral cavity.

[0041] Optionally, one side of the driven part facing the active part has a first curved surface, and one side of the active part facing the driven part has a second curved surface, and the first curved surface and the second curved surface are in concave-convex fit.

[0042] Based on the above embodiments, the concave-convex fit of the first curved surface and the second curved surface is used to realize the rotational connection between the active part and the driven part, so as to facilitate the rotation of the driven part relative to the active part, change the volume of the variable volume chamber, and then pump the liquid to the nozzle through the liquid outlet and spray it out through the nozzle to clean the user's oral cavity.

[0043] Optionally, the water pump further includes a rotating shaft, and the rotating shaft connects the active part and the driven part, and the active part drives the driven part to rotate through the rotating shaft.

[0044] Optionally, the water pump further includes a driving shaft and a driving member. The driving shaft penetrates through the pump housing and is fixedly connected to the active part, and the driving member is in transmission connection with the driving shaft.

[0045] Based on the above embodiments, the driving member is electrically connected to the main control board, so that the main control board can control the operation of the driving member, so that the driving member can drive the driving shaft to drive the driving part to rotate, so that the liquid in the liquid storage tank can be pumped to the nozzle and ejected through the nozzle to clean the user's oral cavity.

[0046] Optionally, the water pump further includes a bevel gear and a gear disc. The bevel gear meshes with the output shaft of the driving member; the gear disc meshes with the bevel gear and is connected to and coaxially arranged with the driving shaft.

[0047] Based on the above embodiments, by using the meshing of the bevel gear and the gear disc, the axis of the output shaft of the driving member can be arranged at an angle with the axis of the driving shaft. Furthermore, in the direction of the axis of the driving shaft, the space occupied inside the housing can be reduced, so as to reduce the size of the housing in the direction of the axis of the driving shaft, thereby reducing the volume of the oral care device and facilitating the use and carrying of the oral care device.

[0048] Optionally, the pump housing further has a positioning groove. The positioning groove is arranged on the side of the pump housing away from the driving shaft. A limiting portion is arranged on the outer peripheral side of the driven portion; the water pump further includes a limiting shaft. The limiting shaft is rotatably arranged in the positioning groove. The axis of the limiting shaft is arranged at an angle with the axis of the driving shaft. The limiting shaft has a limiting groove. The notch of the limiting groove faces the driven portion, and the limiting portion is slidably arranged in the limiting groove; wherein, the driving portion drives the driven portion to rotate, so that the limiting shaft rotates in the positioning groove, and the limiting portion moves along the limiting groove, so that the volume of the variable volume cavity becomes larger or smaller.

[0049] Based on the above embodiments, the driving portion drives the driven portion to rotate, so that the limiting shaft rotates in the positioning groove, and the limiting portion moves along the limiting groove, so that the volume of the variable volume cavity becomes larger or smaller, and further the liquid in the liquid storage tank can be pumped out through the nozzle to clean the user's oral cavity.

[0050] Optionally, the pump housing has an avoidance hole and an installation groove communicating with the avoidance hole. The driving shaft passes through the avoidance hole and the installation groove. The water pump further includes a sealing ring. The sealing ring is arranged in the installation groove and is hermetically connected to the peripheral side of the driving shaft.

[0051] Based on the above embodiments, the sealing ring can be used to achieve a sealed connection between the pump housing and the driving shaft, so as to prevent the liquid from leaking through the gap between the pump housing and the driving shaft, reduce the probability of damage to the components inside the oral care device, and enable the oral care device to have a longer service life.

[0052] In the second aspect of the embodiments of the present application, an oral care device is provided, including a water pump, a housing, a liquid storage tank and a nozzle. The water pump is arranged inside the housing; the liquid storage tank is connected to the housing and communicates with the liquid inlet; the nozzle is connected to the housing and communicates with the liquid outlet.

[0053] In the embodiments of the present application, the communication part is used to communicate with the liquid inlet or the liquid outlet periodically during the rotation of the rotor. When the variable volume chamber communicates with the liquid outlet through the communication part, the liquid in the variable volume chamber is pumped to the nozzle through the communication part and the liquid outlet. Since the communication part and the liquid outlet are arranged in a staggered manner, the liquid in the variable volume chamber will not be pumped to the nozzle, so that the liquid output of the nozzle can be reduced, the use of the liquid in the liquid storage tank can be reduced, and thus the use time of the user can be increased to improve the cleaning effect.

[0054] Moreover, since the usage amount of the liquid in the liquid storage tank is reduced, the volume of the liquid storage tank can be reduced to reduce the overall volume of the oral care device, which is convenient for the user to carry and use the oral care device. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0056] Figure 1 Structural schematic diagram of an oral care device in an embodiment of the present application;

[0057] Figure 2 Internal structural schematic diagram of an oral care device in an embodiment of the present application;

[0058] Figure 3 Structural schematic diagram of a water pump in an embodiment of the present application;

[0059] Figure 4 Another structural schematic diagram of a water pump in an embodiment of the present application;

[0060] Figure 5 Along Figure 3 Partial sectional structural schematic diagram of the A-A line in;

[0061] Figure 6 Partial exploded structural schematic diagram of a water pump in an embodiment of the present application;

[0062] Figure 7 Structural schematic diagram of a first housing in an embodiment of the present application;

[0063] Figure 8 Cross-sectional structural schematic diagram of a rotor in an embodiment of the present application.

[0064] Description of reference numerals: 1. Oral care device; 11. Housing; 12. Liquid storage tank; 13. Nozzle; 2. Water pump; 21. Pump housing; 21A. Liquid inlet; 21B. Liquid outlet; 21C. Positioning groove; 21D. Avoidance hole; 21E. Installation groove; 211. First housing; 211A. Liquid inlet channel; 211A1. First arc segment; 211A2. Second arc segment; 211B. Liquid outlet channel; 2111. First housing body; 2112. Liquid inlet pipe; 2113. Liquid outlet pipe; 212. Second housing; 22. Rotor; 22A. Variable volume chamber; 221. Driving part; 221A. Second curved surface; 222. Driven part; 222A. Connecting part; 222B. Bottom surface; 222C. Spherical surface; 222D. Pressure relief groove; 222E. First curved surface; 2221. Limiting part; 23. Driving shaft; 24. Driving member; 25. Bevel gear; 26. Gear disc; 27. Rotating shaft; 28. Limiting shaft; 28A. Limiting groove; 29. Sealing ring. Detailed implementation manners

[0065] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0066] Please refer to Figure 1 and Figure 2 , an embodiment of the present application provides an oral care device 1, and the oral care device 1 includes a water pump 2, a housing 11, a liquid storage tank 12 and a nozzle 13. It can be understood that, in the embodiment of the present application, the oral care device 1 can be a dental irrigator.

[0067] The housing 11 covers the outside of the water pump 2 and the liquid storage tank 12, and is used to protect the water pump 2 and the liquid storage tank 12, which can reduce the probability of damage to the water pump 2 and the liquid storage tank 12, so that the water pump 2 and the liquid storage tank 12 can have a long service life, and further the oral care device 1 can have a long service life. Exemplarily, the material of the housing 11 can be metal or plastic. In the embodiment of the present application, the material of the housing 11 is not specifically limited. It can be understood that when the material of the housing 11 is a plastic material, the housing 11 can be integrally formed by an injection molding process, so that the housing 11 has a high structural strength, which can reduce the probability of damage to the housing 11, and further the housing 11 can be used to protect the water pump 2 and the liquid storage tank 12, so that the oral care device 1 can have a long service life; and the plastic housing 11 can reduce the weight of the housing 11 itself, thereby reducing the overall weight of the oral care device 1, which is convenient for users to use and carry the oral care device 1.

[0068] The water pump 2 is disposed inside the housing 11 and is connected to the liquid storage tank 12 and the nozzle 13 through pipelines, so that the liquid in the liquid storage tank 12 can be pumped to the nozzle 13 to clean the user's oral cavity.

[0069] The liquid storage tank 12 is disposed inside the housing 11 and is used for storing liquid, and the liquid may include at least one of a cleaning liquid and clear water.

[0070] The nozzle 13 extends outside the housing 11, so that the water pump 2 can pump the liquid in the liquid storage tank 12 to the nozzle 13 and spray it through the nozzle 13, thereby achieving the purpose of cleaning the user's oral cavity.

[0071] Please refer to Figure 3 -5. In one embodiment, the water pump 2 includes a pump housing 21 and a rotor 22. The pump housing 21 has a liquid inlet 21A and a liquid outlet 21B; the rotor 22 includes a driving part 221 and a driven part 222 that are connected to each other. The driving part 221 and the driven part 222 are both disposed inside the pump housing 21, and at least one variable volume chamber 22A is defined between the driving part 221, the driven part 222 and the inner wall of the pump housing 21. During the rotation of the driving part 221 driving the driven part 222, the volume of the variable volume chamber 22A will become larger or smaller. When the volume of the variable volume chamber 22A becomes larger, it can suck the liquid from the liquid storage tank 12 through the liquid inlet 21A and store it in the variable volume chamber 22A; when the volume of the variable volume chamber 22A becomes smaller, it can pump the liquid stored in the variable volume chamber 22A to the nozzle 13 through the liquid outlet 21B. In this way, the volume of the variable volume chamber 22A alternately changes between becoming larger and smaller, so that the liquid in the liquid storage tank 12 is sprayed out through the nozzle 13 to clean the user's oral cavity.

[0072] Please refer to Figure 3 -6. It can be understood that, in one embodiment, the side of the driven part 222 facing the driving part 221 has a first curved surface 222E, and the side of the driving part 221 facing the driven part 222 has a second curved surface 221A. The first curved surface 222E and the second curved surface 221A are in concave-convex fit to realize the rotational connection between the driving part 221 and the driven part 222, so as to facilitate the rotation of the driven part 222 relative to the driving part 221, change the volume of the variable volume chamber 22A, and then pump the liquid to the nozzle 13 through the liquid outlet 21B and spray it through the nozzle 13 to clean the user's oral cavity. In another embodiment, the water pump 2 further includes a rotating shaft 27, and the rotating shaft 27 connects the driving part 221 and the driven part 222, and the driving part 221 drives the driven part 222 to rotate through the rotating shaft 27. In the embodiments of the present application, the specific connection manner between the driving part 221 and the driven part 222 is not limited.

[0073] When the extrusion pressure of the liquid by the driving part 221 and the driven part 222 is relatively small, the pressure of the liquid ejected from the nozzle 13 is relatively small. The liquid with relatively small pressure has a poor cleaning effect on the user's oral cavity and causes waste of the liquid in the liquid storage tank 12.

[0074] Please refer to Figure 1 and Figure 3 -6. In the embodiment of the present application, the driving part 221 or the driven part 222 further has a communication part 222A communicating with the volume change cavity 22A. The communication part 222A is used to communicate with the liquid inlet 21A or the liquid outlet 21B periodically during the rotation of the rotor 22, so that when the extrusion pressure of the liquid by the driving part 221 and the driven part 222 is the largest, when the volume change cavity 22A communicates with the liquid outlet 21B through the communication part 222A, the volume change cavity 22A can pump the liquid to the nozzle 13 through the communication part 222A and the liquid outlet 21B, thereby ensuring that the pressure of the liquid ejected from the nozzle 13 is relatively large to ensure a better cleaning effect on the user's oral cavity; and when the extrusion pressure of the liquid by the driving part 221 and the driven part 222 is relatively small, the communication part 222A and the liquid outlet 21B are arranged in a dislocation manner, and the liquid in the volume change cavity 22A will not be pumped to the nozzle 13, thereby reducing the liquid output of the nozzle 13 to reduce the use of the liquid in the liquid storage tank 12, and further increasing the user's use time to improve the cleaning effect. And the use amount of the liquid in the liquid storage tank 12 is less, which can reduce the volume of the liquid storage tank 12 to reduce the overall volume of the oral care device 1, facilitating the user to carry and use the oral care device 1.

[0075] Please refer to Figure 1 , Figure 4 and Figure 5 , to facilitate driving the driving part 221 to rotate, the water pump 2 further includes a driving shaft 23 and a driving member 24. The driving shaft 23 passes through the pump housing 21 and is fixedly connected to the driving part 221. The driving member 24 is in transmission connection with the driving shaft 23 and is electrically connected to the main control board, so that the main control board can control the driving member 24 to act, so that the driving member 24 can drive the driving shaft 23 to drive the driving part 221 to rotate, thereby pumping the liquid in the liquid storage tank 12 to the nozzle 13 and ejecting it through the nozzle 13 to clean the user's oral cavity.

[0076] Specifically, the water pump 2 further includes a bevel gear 25 and a gear disc 26. The bevel gear 25 meshes with the output shaft of the driving member 24, and the gear disc 26 meshes with the bevel gear 25 and is connected to the driving shaft 23 and coaxially arranged therewith. By using the meshing of the bevel gear 25 and the gear disc 26, the axis of the output shaft of the driving member 24 can be arranged at an angle with the axis of the driving shaft 23. Furthermore, in the direction along the axis of the driving shaft 23, the space occupied inside the housing 11 can be reduced, so as to reduce the size of the housing 11 in the direction along the axis of the driving shaft 23, thereby reducing the volume of the oral care device 1 and facilitating the use and carrying of the oral care device 1.

[0077] Please refer to Figure 1 and Figure 3 -5. In one embodiment, the pump housing 21 includes a first housing 211 and a second housing 212. The first housing 211 has a liquid inlet 21A and a liquid outlet 21B. At least a part of the driven part 222 is arranged inside the first housing 211 and is rotatably connected to the first housing 211; the second housing 212 is connected to the first housing 211, and the driving part 221 is arranged inside the second housing 212. The driving shaft 23 extends out of the second housing 212 from the driving part 221, so that the driving part 221 is rotatably connected to the second housing 212. Both the liquid inlet 21A and the liquid outlet 21B are arranged on the first housing 211, and the driving shaft 23 passes through the second housing 212 and is connected to the driving part 221, so that the driving shaft 23 and the liquid inlet 21A and the liquid outlet 21B can be respectively arranged on both sides of the pump housing 21, thereby reducing the influence of the driving shaft 23 on the connecting pipelines of the liquid inlet 21A and the liquid outlet 21B, improving the connection stability of the pipeline with the liquid inlet 21A and the pipeline with the liquid outlet 21B, and further ensuring that the water pump 2 can pump the liquid in the liquid storage tank 12 to the nozzle 13 and spray it out through the nozzle 13 to clean the user's oral cavity.

[0078] It can be understood that a sealing ring is arranged between the first housing 211 and the second housing 212. When the first housing 211 and the second housing 212 are connected, the sealing ring can be extruded, so that the sealing ring deforms, thereby filling the gap between the first housing 211 and the second housing 212, reducing the probability of liquid overflow in the variable volume chamber 22A, and reducing the probability of damage to other components inside the housing 11, so that the oral care device 1 can have a long service life.

[0079] Please refer to Figure 1 and Figure 3-5. In one embodiment, the driven portion 222 has a bottom surface 222B facing the active portion 221, and the bottom surface 222B constitutes a partial cavity wall of the variable cavity 22A. The driven portion 222 also has a spherical surface 222C connected to the bottom surface 222B and arranged away from the variable cavity 22A; wherein the connecting portion 222A can be a through hole with two ends respectively penetrating the bottom surface 222B and the spherical surface 222C. When the squeezing force of the active portion 221 and the driven portion 222 on the liquid is the largest, the through hole is connected to the liquid outlet 21B, and the liquid in the variable cavity 22A can be pumped to the nozzle 13 via the through hole and the liquid outlet 21B to clean the user's mouth.

[0080] Please refer to Figure 1 and Figure 3 -5. It can be understood that the connecting portion 222A can also be a notch arranged at the connection between the bottom surface 222B and the spherical surface 222C. Similarly, when the squeezing force of the active portion 221 and the driven portion 222 on the liquid is the largest, the notch is connected to the liquid outlet 21B, and the liquid in the variable cavity 22A can be pumped to the nozzle 13 through the notch and the liquid outlet 21B to clean the user's mouth.

[0081] Please refer to Figure 1 and Figure 3 -5. In one embodiment, along the rotational direction of the driven part 222, the notch has a first circumferential length, and the variable cavity 22A has a second circumferential length, and the first circumferential length is not greater than 1 / 2 of the second circumferential length, so that when the active part 221 drives the driven part 222 to rotate, the notch is connected to the liquid outlet 21B for a shorter time, thereby reducing the liquid output of the nozzle 13, thereby reducing the use of liquid in the liquid storage tank 12, and making the liquid storage tank 12 smaller, thereby making the volume of the oral care device 1 smaller, which is convenient for carrying and using the oral care device 1; and it can ensure that the liquid sprayed through the nozzle 13 has a greater pressure to improve the cleaning effect on the user's oral cavity.

[0082] If the first circumferential length is greater than 1 / 2 of the second circumferential length, the size of the notch is larger, resulting in a longer connection time between the notch and the liquid outlet 21B when the active part 221 drives the driven part 222 to rotate, resulting in a larger liquid output from the nozzle 13, resulting in more liquid in the liquid storage tank 12 used, and a larger volume of the liquid storage tank 12 required, resulting in a larger volume of the oral care device 1, which is inconvenient to carry and use the oral care device 1; and because the notch is connected to the liquid outlet 21B for a long time, the pressure of the nozzle 13 sprayed out will gradually decrease, resulting in a poor cleaning effect on the user's oral cavity.

[0083] Please refer to Figure 1 and Figure 3-5. In one embodiment, along the rotational axis of the driven part 222, the notch has a first axial thickness, and the volume change cavity 22A has a second axial thickness. The first axial thickness is not greater than 1 / 2 of the second axial thickness, so that when the driving part 221 drives the driven part 222 to rotate, the notch is smaller, thereby reducing the liquid output of the nozzle 13, reducing the use of the liquid in the liquid storage tank 12, enabling the liquid storage tank 12 to be smaller, and further making the volume of the oral care device 1 smaller, facilitating the carrying and use of the oral care device 1. And it can ensure that the liquid ejected through the nozzle 13 has a greater pressure to improve the cleaning effect on the user's oral cavity.

[0084] If the first axial thickness is greater than 1 / 2 of the size of the second axial thickness, it will cause the notch to be larger, resulting in a larger liquid output of the nozzle 13 when the driving part 221 drives the driven part 222 to rotate, more liquid in the used liquid storage tank 12, a larger volume required for the liquid storage tank 12, a larger liquid storage tank 12, a larger volume of the oral care device 1, and inconvenience in carrying and using the oral care device 1. And due to the larger notch, the pressure of the liquid ejected from the nozzle 13 will be smaller, resulting in a poorer cleaning effect on the user's oral cavity.

[0085] Please refer to Figure 1 and Figure 3 -5. In one embodiment, the notch forms a bottom opening on the bottom surface 222B, and the depth of the bottom opening does not exceed the rotational connection between the driven part 222 and the driving part 221. Similarly, when the driving part 221 drives the driven part 222 to rotate, the liquid output of the nozzle 13 can be reduced, the use of the liquid in the liquid storage tank 12 can be reduced, the liquid storage tank 12 can be made smaller, and further the volume of the oral care device 1 can be made smaller, facilitating the carrying and use of the oral care device 1.

[0086] Please refer to Figure 1 and Figure 3 -4. In one embodiment, the number of the volume change cavities 22A is two, the number of the communication parts 222A is two, and the communication parts 222A are arranged in one-to-one correspondence with the volume change cavities 22A, so that in the process of the driving part 221 driving the driven part 222 to rotate 180°, there is a volume change cavity 22A communicating with the liquid outlet 21B through the communication part 222A, thereby pumping out the liquid in the volume change cavity 22A, improving the liquid output efficiency of the water pump 2, and further improving the liquid output efficiency of the nozzle 13 to improve the cleaning efficiency of the oral care device 1 on the user's oral cavity.

[0087] Please refer to Figure 1 and Figure 3-5. In one embodiment, along the circumferential direction of rotation of the driven part 222, the communication part 222A is located in the middle of the volume-variable cavity 22A communicated with the communication part 222A. Compared with arranging the communication part 222A on one side of the volume-variable cavity 22A, the water outlet pressure of the liquid outlet 21B can be made larger, thereby improving the cleaning effect of the oral care device 1 on the user's oral cavity.

[0088] It can be understood that the two communication parts 222A are arranged centrosymmetrically about the rotation axis of the driven part 222, which can make the water outlet pressure of the liquid outlet 21B larger, thereby improving the cleaning effect of the oral care device 1 on the user's oral cavity.

[0089] Please refer to Figure 1 and Figure 3 -5. In one embodiment, the rotation axis of the driven part 222, the liquid inlet 21A, and the liquid outlet 21B are transversely cut by the same reference plane, so that the flow rate of the liquid entering the volume-variable cavity 22A through the liquid inlet 21A is larger, and the pressure of the liquid flowing out of the volume-variable cavity 22A through the liquid outlet 21B is larger. Furthermore, the pumping efficiency of the water pump 2 can be improved, and the cleaning effect of the oral care device 1 on the user's oral cavity can also be improved.

[0090] Please refer to Figure 1 、 Figure 5 and Figure 7 , in one embodiment, since the liquid in the volume-variable cavity 22A is pumped out through the liquid outlet 21B only when the communication part 222A is communicated with the liquid outlet 21B, the inner wall surface of the first housing 211 has a liquid inlet channel 211A communicated with the liquid inlet 21A. When the liquid inlet channel 211A is communicated with the volume-variable cavity 22A, the communication part 222A is not communicated with the liquid outlet 21B. When the liquid inlet channel 211A is not communicated with the volume-variable cavity 22A, the communication part 222A is communicated with the liquid outlet 21B, so that when the extrusion force of the liquid by the driving part 221 and the driven part 222 is small and the communication part 222A and the liquid outlet 21B are arranged in a staggered manner, the liquid in the volume-variable cavity 22A can flow to the liquid inlet 21A through the liquid inlet channel 211A, so as to facilitate the continuous change of the volume of the volume-variable cavity 22A, thereby facilitating the driving part 221 to drive the driven part 222 to move, so as to pump out the liquid in the liquid storage tank 12 to clean the user's oral cavity.

[0091] Please refer to Figure 1 、 Figure 5 and Figure 7, in one embodiment, the inner wall surface of the first housing 211 has a liquid outlet passage 211B communicating with the liquid outlet 21B. When the liquid inlet passage 211A communicates with the variable volume chamber 22A, the communicating portion 222A is not in communication with the liquid outlet passage 211B. When the liquid inlet passage 211A is not in communication with the variable volume chamber 22A, the communicating portion 222A is in communication with the liquid outlet passage 211B. The liquid outlet passage 211B facilitates the liquid in the variable volume chamber 22A to enter the liquid inlet 21A via the communicating portion 222A, and further facilitates the liquid to be ejected via the nozzle 13 to clean the user's oral cavity.

[0092] Exemplarily, within a single rotation period of 180°, the driven portion 222 has a first rotation angle α and a second rotation angle β. Within the first rotation angle α, the liquid inlet passage 211A is always in communication with the variable volume chamber 22A. Within the second rotation angle β, the communicating portion 222A is always in communication with the liquid outlet passage 211B, and the sum of the first rotation angle α and the second rotation angle β is equal to 180°. So that when the extrusion force of the liquid by the driving portion 221 and the driven portion 222 is small and the communicating portion 222A is misaligned with the liquid outlet 21B, the liquid in the variable volume chamber 22A can flow to the liquid inlet 21A via the liquid inlet passage 211A, facilitating the continuous change of the volume of the variable volume chamber 22A, thereby facilitating the driving portion 221 to drive the driven portion 222 to move, and further facilitating the water pump 2 to pump the liquid in the liquid storage tank 12 to the nozzle 13 to clean the user's oral cavity.

[0093] Please refer to Figure 1 , Figure 5 and Figure 7 , it can be understood that the liquid inlet passage 211A is an arc-shaped passage located on the inner wall surface of the first housing 211, and the arc-shaped passage is formed by the depression of the inner wall surface of the first housing 211. In other embodiments, the liquid inlet passage 211A can also be in other forms. In the embodiments of the present application, the specific form of the liquid inlet passage 211A is not limited.

[0094] Please refer to Figure 1 , Figure 5 and Figure 7, in the embodiment of the present application, the arc-shaped channel extends along the circumferential direction of the rotation of the driven part 222, and the arc-shaped channel includes a first arc segment 211A1 and a second arc segment 211A2 located on both sides of the liquid inlet 21A. The first arc segment 211A1 and the second arc segment 211A2 are axially symmetrically arranged with respect to the liquid inlet 21A, so that before the communication part 222A is communicated with the liquid outlet 21B, the liquid in the variable volume cavity 22A can flow back to the liquid inlet 21A via the first arc segment 211A1; after the communication part 222A is communicated with the liquid outlet 21B, the liquid in the variable volume cavity 22A can flow back to the liquid inlet 21A via the second arc segment 211A2, so as to facilitate the change of the volume of the variable volume cavity 22A, thereby facilitating the water pump 2 to pump the liquid in the liquid storage tank 12 to the nozzle 13, so as to facilitate the cleaning of the user's oral cavity.

[0095] Please refer to Figure 1 , Figure 5 and Figure 8 , it can be understood that the number of the communication parts 222A can be one. The driving part 221 has a pressure relief groove 222D communicated with the liquid inlet 21A. The number of the variable volume cavities 22A is two. One of the variable volume cavities 22A is communicated with the communication part 222A, and the other variable volume cavity 22A is communicated with the pressure relief groove 222D.

[0096] Please refer to Figure 1 , Figure 5 and Figure 8 , specifically, the two variable volume cavities 22A are respectively a first variable volume cavity and a second variable volume cavity. The first variable volume cavity is communicated with the communication part 222A, and the second variable volume cavity is kept communicated with the liquid inlet 21A through the pressure relief groove 222D, so that the first variable volume cavity can be used to pump liquid to the nozzle 13, which can further reduce the use of the liquid in the liquid storage tank 12, can reduce the volume of the liquid storage tank 12, so as to reduce the volume of the oral care device 1 and facilitate the use and carrying of the oral care device 1. Moreover, when the volume of the first variable volume cavity decreases and the communication part 222A is misaligned with the liquid outlet 21B, the liquid in the first variable volume cavity can move to the second variable volume cavity via the liquid inlet channel 211A and flow back to the liquid inlet 21A via the pressure relief groove 222D, so as to ensure that the driving part 221 can drive the driven part 222 to move, so as to pump the liquid in the liquid storage tank 12 to the nozzle 13, thereby cleaning the user's oral cavity.

[0097] Please refer to Figure 1 , Figure 2 and Figure 5, in one embodiment, the first housing 211 includes a first housing body 2111, a liquid inlet pipe 2112, and a liquid outlet pipe 2113. The first housing body 2111 has a liquid inlet 21A and a liquid outlet 21B. The driven part 222 is at least partially disposed inside the first housing 211 and is rotatably connected to the first housing body 2111; the liquid inlet pipe 2112 is connected to the first housing body 2111 and communicates with the liquid inlet 21A; the liquid outlet pipe 2113 is connected to the first housing body 2111 and communicates with the liquid outlet 21B; wherein, the liquid inlet pipe 2112 and the liquid outlet pipe 2113 are disposed on both sides of the first housing body 2111 and are arranged at an angle, so as to facilitate the connection of the liquid inlet pipeline with the liquid inlet pipe 2112 and the water storage tank, and also facilitate the connection of the liquid outlet pipeline with the liquid outlet pipe 2113 and the nozzle 13, and can reduce the probability of interference between the liquid inlet pipeline and the liquid outlet pipeline, so as to improve the installation stability of the liquid inlet pipeline and the liquid outlet pipeline, so as to ensure that the water pump 2 can pump the liquid in the liquid storage tank 12 to the nozzle 13 and spray it out through the nozzle 13 to clean the user's oral cavity.

[0098] Please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 , in one embodiment, the pump housing 21 further has a positioning groove 21C. The positioning groove 21C is disposed on the side of the pump housing 21 away from the drive shaft 23. A limiting portion 2221 is disposed on the outer peripheral side of the driven part 222; the water pump 2 further includes a limiting shaft 28. The limiting shaft 28 is rotatably disposed in the positioning groove 21C. The axis of the limiting shaft 28 is arranged at an angle with the axis of the drive shaft 23. The limiting shaft 28 has a limiting groove 28C. The notch of the limiting groove 28C faces the driven part 222, and the limiting portion 2221 is slidably disposed in the limiting groove 28C; wherein, the driving part 221 drives the driven part 222 to rotate, so that the limiting shaft 28 rotates in the positioning groove 21C, and the limiting portion 2221 moves along the limiting groove 28A, so that the volume of the variable volume cavity 22A becomes larger or smaller, and further the liquid in the liquid storage tank 12 can be pumped out through the nozzle 13 to clean the user's oral cavity.

[0099] Please refer to Figure 1 , Figure 2 and Figure 5 , in one embodiment, the pump housing 21 has an avoidance hole 21D and an installation groove 21E communicating with the avoidance hole 21D. The drive shaft 23 passes through the avoidance hole 21D and the installation groove 21E. The water pump 2 further includes a sealing ring 29. The sealing ring 29 is disposed in the installation groove 21E and is sealingly connected to the peripheral side of the drive shaft 23. The sealing ring 29 can be used to realize the sealing connection between the pump housing 21 and the drive shaft 23, so as to prevent the liquid from leaking through the gap between the pump housing 21 and the drive shaft 23, reduce the probability of damage to the components inside the oral care device 1, and enable the oral care device 1 to have a longer service life.

[0100] In the embodiment of the present application, the sealing ring 29 can be a Y-shaped sealing ring. In other embodiments, the sealing ring 29 can also be in other forms.

[0101] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0102] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A water pump, characterized in that: Applications in oral care devices, including: A pump housing having a liquid inlet and a liquid outlet; The rotor includes an active part and a driven part connected to each other, wherein the active part and the driven part are both arranged in the pump housing, and at least one variable cavity is constructed between the active part, the driven part and the inner wall of the pump housing. The active part or the driven part also has a connecting part connected to the variable cavity, and the connecting part is used to periodically connect with the liquid inlet or the liquid outlet during the rotation of the rotor.

2. The water pump according to claim 1, characterized in that: The water pump further comprises a driving shaft connected to the active part, and the pump housing comprises: A first shell has the liquid inlet and the liquid outlet, the driven part is at least partially disposed in the first shell and is rotatably connected to the first shell; and The second shell is connected to the first shell, the active part is arranged in the second shell, and the driving shaft extends from the active part to the outside of the second shell, so that the active part is rotatably connected to the second shell.

3. The water pump according to claim 2, characterized in that: The driven part has a bottom surface facing the active part, the bottom surface constitutes part of the cavity wall of the variable cavity, and the driven part also has a spherical surface connected to the bottom surface and arranged away from the variable cavity; The connecting portion is a through hole with two ends respectively penetrating the bottom surface and the spherical surface, or the connecting portion is a notch provided at the connection between the bottom surface and the spherical surface.

4. The water pump according to claim 3, characterized in that: The connecting portion is a notch provided at the connection between the bottom surface and the spherical surface, wherein the notch satisfies one of the following conditions: Along the rotational circumference of the driven part, the notch has a first circumferential length, the variable cavity has a second circumferential length, and the first circumferential length is not greater than 1 / 2 of the second circumferential length; Along the rotational axis of the driven part, the notch has a first axial thickness, the variable cavity has a second axial thickness, and the first axial thickness is not greater than 1 / 2 of the second axial thickness; The notch forms a bottom opening on the bottom surface, and the depth of the bottom opening does not exceed the rotation connection between the driven part and the active part.

5. The water pump according to claim 2, characterized in that: The number of the variable-capacity cavities is two, the number of the connecting parts is two, and the connecting parts are arranged in a one-to-one correspondence with the variable-capacity cavities.

6. The water pump according to claim 5, characterized in that: Along the rotational circumference of the driven part, the connecting portion is located in the middle of the variable capacity cavity connected with the connecting portion; and / or, The two communicating parts are centrally symmetrically arranged with respect to the rotation axis of the driven part.

7. The water pump according to claim 6, characterized in that The rotating shaft of the driven part, the liquid inlet and the liquid outlet are cross-sectioned by the same reference plane.

8. The water pump according to claim 2, characterized in that: The inner wall surface of the first shell has a liquid inlet channel connected to the liquid inlet. When the liquid inlet channel is connected to the variable volume cavity, the communicating portion is not connected to the liquid outlet. When the liquid inlet channel is not connected to the variable volume cavity, the communicating portion is connected to the liquid outlet.

9. The water pump according to claim 8, characterized in that The inner wall surface of the first shell has a liquid outlet channel connected to the liquid outlet. When the liquid inlet channel is connected to the variable volume chamber, the communicating portion is not connected to the liquid outlet channel. When the liquid inlet channel is not connected to the variable volume chamber, the communicating portion is connected to the liquid outlet channel.

10. The water pump according to claim 9, characterized in that Within a single rotation cycle of 180°, the driven part has a first rotation angle α and a second rotation angle β. Within the first rotation angle α, the liquid inlet channel is always connected to the variable volume chamber. Within the second rotation angle β, the connecting part is always connected to the liquid outlet channel, and the sum of the first rotation angle α and the second rotation angle β is equal to 180°.

11. The water pump according to claim 8, characterized in that The liquid inlet channel is an arc-shaped channel located on the inner wall surface of the first shell, and the arc-shaped channel is formed by a depression of the inner wall surface of the first shell.

12. The water pump according to claim 11, characterized in that The arcuate channel is extended along the rotation circumference of the driven part, and the arcuate channel includes a first arcuate segment and a second arcuate segment located on both sides of the liquid inlet, and the first arcuate segment and the second arcuate segment are axially symmetrically arranged with respect to the liquid inlet.

13. The water pump according to claim 1, characterized in that The number of the connecting part is one, the active part has a pressure relief groove connected to the liquid inlet, the number of the variable chambers is two, one of the variable chambers is connected to the connecting part, and the other of the variable chambers is connected to the pressure relief groove.

14. The water pump according to claim 2, characterized in that The first housing comprises: A first shell body, having the liquid inlet and the liquid outlet, wherein the driven part is at least partially disposed in the first shell body and is rotatably connected to the first shell body; a liquid inlet pipe connected to the first shell body and communicated with the liquid inlet; and a liquid outlet pipe connected to the first shell body and communicated with the liquid outlet; Wherein, the liquid inlet pipe and the liquid outlet pipe are arranged on both sides of the first shell body and are arranged at an angle.

15. The water pump according to claim 1, characterized in that The side of the driven part facing the active part has a first curved surface, the side of the active part facing the driven part has a second curved surface, and the first curved surface and the second curved surface are matched with each other in a concave-convex manner; or, The water pump further comprises a rotating shaft, wherein the rotating shaft is connected to the active part and the driven part, and the active part drives the driven part to rotate via the rotating shaft.

16. The water pump according to any one of claims 1 to 15, characterized in that: Also includes: A drive shaft, passing through the pump housing and fixedly connected to the active part; A driving member is drivingly connected to the driving shaft.

17. The water pump according to claim 16, characterized in that Also includes: a bevel gear meshing with the output shaft of the driving member; and The gear plate is meshed with the bevel gear and connected to the drive shaft and is coaxially arranged.

18. The water pump according to claim 16, characterized in that The pump housing further has a positioning groove, which is arranged on a side of the pump housing away from the driving shaft, and a limiting portion is arranged on the outer peripheral side of the driven part; The water pump also includes: A limiting shaft is rotatably disposed in the positioning groove, the axis of the limiting shaft is disposed at an angle with the axis of the driving shaft, the limiting shaft has a limiting groove, the notch of the limiting groove is disposed toward the driven part, and the limiting part is slidably disposed in the limiting groove; The active part drives the driven part to rotate, so that the limiting shaft rotates in the positioning groove, and the limiting part moves along the limiting groove, so that the volume of the variable cavity increases or decreases.

19. The water pump according to claim 16, characterized in that The pump housing has a relief hole and a mounting groove communicating with the relief hole, the drive shaft is passed through the relief hole and the mounting groove, and the water pump further includes: A sealing ring is arranged in the mounting groove and is sealingly connected to the peripheral side of the driving shaft.

20. An oral care device, characterized in that: include: The water pump according to any one of claims 1 to 19; a housing, wherein the water pump is disposed in the housing; A liquid storage tank connected to the housing and in communication with the liquid inlet; A nozzle is connected to the shell and communicated with the liquid outlet.

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