Pump body module and oral irrigator

Abstract

The utility model discloses a pump body module and an oral irrigator, and relates to the technical field of oral irrigators, the pump body module comprises a shell, the shell is provided with a containing cavity, a first opening and a second opening, the first opening and the second opening are communicated with the containing cavity, and the shell is provided with a first side and a second side which are oppositely arranged in the first direction; the first opening and the second opening are positioned on the first side; a water inlet assembly; the driving assembly comprises a driver, a driving gear, a transmission gear and a piston assembly, the driving gear is located between the transmission gear and the water inlet assembly, and the driving gear and the transmission gear are located on the side, close to the second opening, of the piston assembly; the technical scheme provided by the utility model has the technical effects that the space occupied by the transmission gear, the driving gear and the driver is positioned above the piston assembly, so that the space in the pump body module is utilized more reasonably, and the problem that the size of the pump body module is larger is solved.

Description

Technical Field

[0001] This utility model relates to the field of oral irrigator technology, and in particular to a pump module and an oral irrigator. Background Technology

[0002] A countertop water flosser is a cleaning tool that uses pulsating water jets to clean teeth and between teeth. It uses a pump to draw water from a tank and create a high-speed, fine, and powerful jet of water that can reach deep into hard-to-reach areas such as between teeth, in tooth sockets, or around the gum line, effectively removing food debris and plaque. However, existing countertop water flossers often have bulky pump modules with limited applicability, failing to meet the needs of many users. Utility Model Content

[0003] The main purpose of this invention is to propose a pump body module and a dental flosser, which aims to improve the problem of the large size of the pump body module.

[0004] To achieve the above objectives, the present invention proposes a pump module comprising a housing having a receiving cavity and a first opening and a second opening communicating with the receiving cavity. The housing has a first side and a second side disposed opposite to each other along a first direction, with the first opening and the second opening located on the first side. A water inlet assembly is located at the first opening. A drive assembly includes a driver, a drive gear, a transmission gear, and a piston assembly. The driver is used to drive the drive gear and the transmission gear to rotate, thereby driving the piston assembly to draw water from the water tank into the water inlet assembly. The driver is located at the second opening, the drive gear is located on the output shaft of the driver, and the transmission gear and the piston assembly are sequentially connected to the drive gear. The drive gear is located between the transmission gear and the water inlet assembly, and the drive gear and the transmission gear are located on the side of the piston assembly closer to the second opening.

[0005] In one embodiment, the rotation axis of the transmission gear and the axis of the first opening have a preset distance, the preset distance being not less than 50 mm and not more than 70 mm.

[0006] In one embodiment, the piston assembly further includes a piston rod and a first connector, the piston rod and the first connector being respectively disposed within the receiving cavity, one end of the piston rod being movably disposed on the first connector, the transmission gear being drivingly connected to the other end of the piston rod, and the first connector being connected to the water inlet assembly.

[0007] In one embodiment, the piston rod moves within the first connector in a second direction for a distance of not less than 3.5 mm and not more than 4.5 mm.

[0008] In one embodiment, the water inlet assembly includes an inlet connector, a second connector, and an outlet connector that are interconnected. The inlet connector is located at the first opening, and the outlet connector is located on the second side. The inlet connector is used to connect to the water supply tank. The inlet connector, the second connector, and the outlet connector are arranged along the first direction. The second connector is located between the inlet connector and the outlet connector, and the first connector connects to the second connector.

[0009] In one embodiment, the pump body module further includes a water outlet pipe, the top wall of the second connector has a water inlet, the bottom wall of the second connector has a water outlet, the water inlet connector is connected to the water inlet, one end of the water outlet connector is connected to the water outlet, and the water outlet pipe is connected to the other end of the water outlet connector.

[0010] In one embodiment, the drive assembly further includes a drive shaft, the housing includes a first outer shell and a second outer shell connected to each other, the first outer shell and the second outer shell enclosing the receiving cavity, the first outer shell having a second opening on the side opposite to the second outer shell, the drive being mounted on the first outer shell through the second opening, the bottom wall of the second outer shell having a mounting hole, the drive shaft being disposed in the mounting hole, and the drive gear being disposed on the drive shaft.

[0011] In one embodiment, the receiving cavity includes a first chamber, a second chamber, and a third chamber that are interconnected. The first chamber, the second chamber, and the third chamber are arranged along the second direction. The first housing has a first protrusion on the side away from the water inlet assembly, and the second housing has a second protrusion on the side away from the water inlet assembly. The first protrusion and the second protrusion together form the first chamber. The first chamber is used to install the transmission gear and a part of the piston rod. The second chamber is used to install the first connector and another part of the piston rod. The third chamber is used to install the water inlet assembly.

[0012] In one embodiment, the pump body module further includes a buffer member. The outer peripheral side of the first housing is provided with a first connecting portion, and the outer peripheral side of the second housing is provided with a second connecting portion. The first connecting portion and the second connecting portion are connected through the buffer member to make the first housing and the second housing sealed together.

[0013] This utility model also proposes a water flosser, including a water tank, a nozzle assembly, and a pump module as described in any of the above embodiments, wherein the water tank is connected to the pump module, and the pump module is connected to the nozzle assembly.

[0014] The technical solution of this utility model adopts a drive gear located between the transmission gear and the water inlet assembly. By positioning the drive gear and transmission gear on the side of the piston assembly near the second opening, the space occupied by the drive gear and the driver is located on the side of the transmission gear near the first opening, thereby reducing the length of the pump body module. The space occupied by the transmission gear, drive gear, and driver is located above the piston assembly, making it easier for the driver to drive the drive gear, transmission gear, and piston assembly to work respectively. This allows for more rational use of the space within the pump body module, thus improving the problem of the large size of the pump body module. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the pump body module provided by this utility model;

[0017] Figure 2 An exploded structural diagram of an embodiment of the pump body module provided by this utility model;

[0018] Figure 3 A structural cross-sectional view of an embodiment of the pump body module provided by this utility model;

[0019] Figure 4 A cross-sectional view of the first and second outer shells in one embodiment of the pump body module provided by this utility model;

[0020] Figure 5 This is a structural schematic diagram of one angle in one embodiment of the pump body module provided by this utility model.

[0021] Explanation of icon numbers:

[0022] 1. Housing; 11. Receiving cavity; 111. First chamber; 112. Second chamber; 113. Third chamber; 12. First opening; 13. Second opening; 14. First side; 15. Second side; 16. First outer shell; 161. First protrusion; 162. First connecting part; 17. Second outer shell; 171. Mounting hole; 172. Second protrusion; 173. Second connecting part; 2. Water inlet assembly; 21. Water inlet connector; 22. Second connector; 221. Water inlet; 222. Water outlet; 23. Water outlet connector; 3. Drive assembly; 31. Driver; 32. Drive gear; 33. Transmission gear; 34. Piston assembly; 341. Piston rod; 342. First connector; 35. Drive shaft; 4. Water outlet pipe; 5. Buffer.

[0023] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] This utility model proposes a pump body module.

[0028] Please see Figures 1 to 3 In one embodiment of this utility model, the pump module includes a housing 1, a water inlet assembly 2, and a drive assembly 3; the housing 1 has a receiving cavity 11 and a first opening 12 and a second opening 13 communicating with the receiving cavity 11; the housing 1 has a first side 14 and a second side 15 disposed opposite to each other along a first direction, the first opening 12 and the second opening 13 being located on the first side 14; the water inlet assembly 2 is located at the first opening 12; the drive assembly 3 includes a driver 31, a drive gear 32, a transmission gear 33, and a piston assembly 34, the driver 31 being used for The drive gear 32 and the transmission gear 33 are driven to rotate, thereby driving the piston assembly 34 to draw water from the water tank into the water inlet assembly 2. The driver 31 is located at the second opening 13, the drive gear 32 is located on the output shaft of the driver 31, and the transmission gear 33 and the piston assembly 34 are sequentially connected to the drive gear 32. The drive gear 32 is located between the transmission gear 33 and the water inlet assembly 2, and the drive gear 32 and the transmission gear 33 are located on the side of the piston assembly 34 near the second opening 13.

[0029] The technical solution of this utility model adopts a drive gear 32 located between the transmission gear 33 and the water inlet assembly 2. By positioning the drive gear 32 and the transmission gear 33 on the side of the piston assembly 34 near the second opening 13, the space occupied by the drive gear 32 and the driver 31 is located on the side of the transmission gear 33 near the first opening 12, thereby reducing the length of the pump body module. The space occupied by the transmission gear 33, the drive gear 32, and the driver 31 is located above the piston assembly 34, making it easier for the driver 31 to drive the drive gear 32, the transmission gear 33, and the piston assembly 34 respectively, thus making more rational use of the space inside the pump body module and improving the problem of the large size of the pump body module.

[0030] In one embodiment, the first direction may be consistent with the vertical direction. The housing 1 may have a receiving cavity 11 for accommodating the drive assembly 3 and a first side 14 and a second side 15 disposed opposite to each other along the first direction. The housing 1 may have a first opening 12 and a second opening 13 disposed at intervals on the first side 14, thereby facilitating the installation of the water inlet assembly 2 and the driver 31. The first opening 12 can be used to install the water inlet assembly 2, and the second opening 13 can be used to install the driver 31, so that the driver 31 and the water inlet assembly 2 are disposed at intervals. The drive gear 32, the transmission gear 33, and the piston assembly 34 may be respectively disposed in the receiving cavity 11. The drive gear 32 is drivenly connected to the output shaft of the driver 31, and the transmission gear 33 and the piston assembly 34 are sequentially drivenly connected to the drive gear 32, thereby facilitating the driver 31 to drive the piston assembly 34 to operate and draw water from the water tank into the water inlet assembly 2. This application positions the drive gear 32 between the transmission gear 33 and the water inlet assembly 2, so that the arrangement direction of the transmission gear 33 and the drive gear 32 along the second direction is consistent with the movement direction of the piston assembly 34. This makes reasonable use of the space on the side of the transmission gear 33 near the water inlet assembly 2 within the receiving cavity 11, thereby avoiding the problem of the drive gear 32 occupying space within the receiving cavity 11 and increasing the length of the housing 1. The driver 31 is located at the second opening 13, meaning that only the output shaft of the driver 31 and the drive gear 32 are installed within the receiving cavity 11, further reducing the installation space occupied by the drive assembly 3 within the receiving cavity 11. This application employs a drive gear 32 and a transmission gear 33 located on the side of the piston assembly 34 near the second opening 13, meaning that both the drive gear 32 and the transmission gear 33 are located above the piston assembly 34. This makes it easier for the driver 31 to drive the piston assembly 34 to work via the drive gear 32 and the transmission gear 33. Furthermore, the piston assembly 34, the drive gear 32, and the transmission gear 33 are arranged along the first direction, thereby making more reasonable use of the space above the piston assembly 34 within the receiving cavity 11 and thus improving the problem of the large size of the pump body module.

[0031] In one embodiment, the rotation axis of the transmission gear 33 and the axis of the first opening 12 have a preset distance, the preset distance being not less than 50 mm and not more than 70 mm.

[0032] In this embodiment, the present application employs a preset distance between the rotation axis of the transmission gear 33 and the axis of the first opening 12 along the second direction. This preset distance can be 55 mm, 60 mm, 65 mm, or 70 mm. Within this range, the present application can effectively adjust the size of the pump module by adjusting the preset distance, while avoiding excessive increase or decrease in the output power of the pump module, thus preventing any impact on the operation of the oral irrigator.

[0033] like Figure 3As shown, in one embodiment, the piston assembly 34 further includes a piston rod 341 and a first connector 342. The piston rod 341 and the first connector 342 are respectively disposed in the receiving cavity 11. One end of the piston rod 341 is movably disposed on the first connector 342. The transmission gear 33 drivesly connects to the other end of the piston rod 341. The first connector 342 communicates with the water inlet assembly 2.

[0034] In this embodiment, the transmission gear 33 can be configured as an eccentric gear. The end of the transmission gear 33 facing away from the drive gear 32 can be provided with a transmission part. The transmission gear 33 is connected to the piston rod 341 via the transmission part, thus facilitating the actuator 31 to drive the drive gear 32 and the transmission gear 33 to reciprocate the piston rod 341. This application also allows one end of the piston rod 341 to be movably mounted on the first connecting member 342, which can be located within the water inlet assembly 2. The transmission gear 33 is connected to the other end of the piston rod 341, and the first connecting member 342 connects to the water inlet assembly 2. This allows the piston rod 341 to reciprocate within the first connecting member 342 under the drive of the actuator 31, thereby enabling the piston rod 341 to more efficiently change the air pressure within the water inlet assembly 2.

[0035] In one embodiment, the piston rod 341 moves within the first connector 342 along a second direction for a distance of not less than 3.5 mm and not more than 4.5 mm.

[0036] In this embodiment, the second direction can be aligned with the length direction of the housing 1. The travel distance of the piston rod 341 within the first connector 342 and along the second direction can be 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, and 4.5 mm. Within this range, adjusting the travel distance of the piston rod 341 can effectively adjust the overall volume of the pump module while avoiding excessive increase or decrease in the output power of the pump module, thus affecting the operation of the oral irrigator. By limiting the travel distance of the piston rod 341 to the range of 3.5 mm to 4.5 mm, this application makes it more suitable for pump modules with dimensions ranging from 95-103 mm in length, 35-37 mm in width, and 70-75 mm in height.

[0037] like Figure 2 and Figure 3As shown, in one embodiment, the water inlet assembly 2 includes an inlet connector 21, a second connector 22, and an outlet connector 23 that are interconnected. The inlet connector 21 is located at the first opening 12, and the outlet connector 23 is located on the second side 15. The inlet connector 21 is used to connect to the water supply tank. The inlet connector 21, the second connector 22, and the outlet connector 23 are arranged along the first direction. The second connector 22 is located between the inlet connector 21 and the outlet connector 23. The first connector 342 connects to the second connector 22.

[0038] In this embodiment, the first direction can be consistent with the up-down direction. This application uses an inlet connector 21, a second connector 22, and an outlet connector 23 connected sequentially, making it easier for water in the tank to be output to the nozzle assembly (not shown) sequentially via these connectors. This application uses an inlet connector 21 located at the first opening 12, an outlet connector 23 located on the second side 15, and a second connector 22 located between the inlet connector 21 and the outlet connector 23, so that the inlet connector 21, the second connector 22, and the outlet connector 23 are arranged along the first direction. This allows the water inlet assembly 2 to be set to a top-down water inlet method, thereby reducing the width of the pump module.

[0039] like Figure 1 and Figure 3 As shown, in one embodiment, the pump body module further includes a water outlet pipe 4, the top wall of the second connector 22 has a water inlet 221, the bottom wall of the second connector 22 has a water outlet 222, the water inlet connector 21 is connected to the water inlet 221, one end of the water outlet connector 23 is connected to the water outlet 222, and the water outlet pipe 4 is connected to the other end of the water outlet connector 23.

[0040] In this embodiment, to facilitate the delivery of clean water from the inlet assembly 2 to the nozzle assembly, the pump module further includes an outlet pipe 4. One end of the outlet pipe 4 is connected to the outlet connector 23. The inlet connector 21 is connected to the outlet connector 23 via the second connector 22, thereby improving the pumping efficiency of the pump module. This application employs an inlet 221 on the top wall of the second connector 22, with the inlet connector 21 connected to the inlet 221, so that the inlet connector 21 is positioned above the second connector 22. An outlet 222 is located on the bottom wall of the second connector 22, with the outlet connector 23 connected to the outlet 222, so that the outlet connector 23 is positioned below the second connector 22. The water inlet assembly 2 of this application uses a top-down water inlet method, thereby reducing the width of the pump module and allowing water to be delivered to the nozzle assembly more efficiently under gravity.

[0041] like Figure 3 As shown, in one embodiment, the drive assembly 3 further includes a drive shaft 35, the housing 1 includes a first outer shell 16 and a second outer shell 17 connected to each other, the first outer shell 16 and the second outer shell 17 enclosing the receiving cavity 11, the first outer shell 16 has a second opening 13 on the side opposite to the second outer shell 17, the driver 31 is mounted on the first outer shell 16 through the second opening 13, the bottom wall of the second outer shell 17 has a mounting hole 171, the drive shaft 35 is disposed in the mounting hole 171, and the drive gear 33 is disposed on the drive shaft 35.

[0042] In this embodiment, to improve the installation accuracy of the transmission gear 33 and the drive gear 32, this application also includes a transmission shaft 35. The transmission gear 33 is tractively connected to the transmission shaft 35, the drive gear 32 meshes with the transmission gear 33, and the piston rod 341 is tractively connected to the transmission gear 33. To improve the stability of the transmission shaft 35 installed in the first housing 16 and the second housing 17, the first housing 16 and the second housing 17 may also be provided with mounting holes 171 opposite to each other, and the two ends of the transmission shaft 35 are respectively installed in the two mounting holes 171. To facilitate the installation and disassembly of the drive assembly 3 and the water inlet assembly 2, this application adopts a housing 1 comprising two interconnected parts: a first housing 16 and a second housing 17. The first housing 16 is detachably connected to the second housing 17, and the first housing 16 and the second housing 17 enclose a receiving cavity 11.

[0043] like Figure 4 As shown, in one embodiment, the receiving cavity 11 includes a first chamber 111, a second chamber 112, and a third chamber 113 that are interconnected. The first chamber 111, the second chamber 112, and the third chamber 113 are arranged along the second direction. The inner sidewall of the first outer shell 16 is provided with a first protrusion 161 on the side away from the water inlet assembly 2. The inner sidewall of the second outer shell 17 is provided with a second protrusion 172 on the side away from the water inlet assembly 2. The first protrusion 161 and the second protrusion 172 surround to form the first chamber 111. The first chamber 111 is used to install the transmission gear 33 and a part of the piston rod 341. The second chamber 112 is used to install the first connector 342 and another part of the piston rod 341. The third chamber 113 is used to install the water inlet assembly 2.

[0044] In this embodiment, the first protrusion 161, the second protrusion 172, the inner wall of the first outer shell 16, and the inner wall of the second outer shell 17 enclose a first chamber 111. The first chamber 111 has a third opening on the side near the first opening 12. A portion of the piston rod 341 extends into the second chamber 112 through the third opening, thereby facilitating the reciprocating movement of the piston rod 341 within the first connecting member 342. This application employs a first protrusion 161 and a second protrusion 172 respectively on the first outer shell 16 and the second outer shell 17. The first protrusion 161 cooperates with the second protrusion 172 to divide the first chamber 111 and the second chamber 112. The first chamber 111, the second chamber 112, and the third chamber 113 can be used to install the drive assembly 3 and the transmission assembly, respectively, thereby more rationally planning the space within the receiving cavity 11, and more conveniently installing the drive assembly 3 and the transmission assembly within the receiving cavity 11, thereby further reducing the volume of the pump module.

[0045] like Figure 5 As shown, in one embodiment, the pump body module further includes a buffer 5. The outer periphery of the first housing 16 is provided with a first connecting portion 162, and the outer periphery of the second housing 17 is provided with a second connecting portion 173. The first connecting portion 162 and the second connecting portion 173 are connected through the buffer 5 so that the first housing 16 and the second housing 17 are sealed together.

[0046] In this embodiment, to improve the sealing of the connection between the first housing 16 and the second housing 17, the first connecting portion 162 of the first housing 16 and the second connecting portion 173 of the second housing 17 can be sealed together by the buffer member 5. The first housing 16 may be provided with the first connecting portion 162 on both sides along the second direction, and the second housing 17 may be provided with the second connecting portion 173 on both sides along the second direction, so that the vibration generated by the drive assembly 3 can be transmitted from the first housing 1 and the second housing 1 to the buffer member 5 respectively, so that the buffer member 5 can use its own elasticity to offset the vibration.

[0047] This utility model also proposes a water flosser, which includes a water tank, a nozzle assembly, and a pump module. The specific structure of the pump module is as described in the above embodiments. Since this water flosser adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The water tank is connected to the pump module, and the pump module is connected to the nozzle assembly, thereby facilitating the extraction of water from the water tank to the nozzle assembly.

[0048] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pump body module, characterized in that, include: A housing having a receiving cavity and a first opening and a second opening communicating with the receiving cavity, the housing having a first side and a second side disposed opposite to each other along a first direction, the first opening and the second opening being located on the first side; The water inlet assembly is located at the first opening; The drive assembly includes a driver, a drive gear, a transmission gear, and a piston assembly. The driver drives the drive gear and the transmission gear to rotate, thereby driving the piston assembly to draw water from the water tank into the water inlet assembly. The driver is located at the second opening, the drive gear is located on the output shaft of the driver, and the transmission gear and the piston assembly are sequentially connected to the drive gear. The drive gear is located between the transmission gear and the water inlet assembly, and the drive gear and the transmission gear are located on the side of the piston assembly closer to the second opening.

2. The pump module as described in claim 1, characterized in that, The rotation axis of the transmission gear and the axis of the first opening have a preset distance, which is not less than 50 mm and not more than 70 mm.

3. The pump module as described in claim 1, characterized in that, The piston assembly further includes a piston rod and a first connecting member. The piston rod and the first connecting member are respectively disposed in the receiving cavity. One end of the piston rod is movably disposed on the first connecting member. The transmission gear drives the other end of the piston rod. The first connecting member communicates with the water inlet assembly.

4. The pump body module as described in claim 3, characterized in that, The piston rod's travel distance within the first connector along the second direction is not less than 3.5 mm and not more than 4.5 mm.

5. The pump body module as described in claim 4, characterized in that, The water inlet assembly includes an inlet connector, a second connector, and an outlet connector that are interconnected. The inlet connector is located at the first opening, and the outlet connector is located on the second side. The inlet connector is used to connect to the water supply tank. The inlet connector, the second connector, and the outlet connector are arranged along the first direction. The second connector is located between the inlet connector and the outlet connector, and the first connector connects to the second connector.

6. The pump module as described in claim 5, characterized in that, The pump body module also includes a water outlet pipe. The top wall of the second connector has a water inlet, and the bottom wall of the second connector has a water outlet. The water inlet connector is connected to the water inlet, one end of the water outlet connector is connected to the water outlet, and the water outlet pipe is connected to the other end of the water outlet connector.

7. The pump body module as described in claim 5, characterized in that, The drive assembly further includes a drive shaft. The housing includes a first outer shell and a second outer shell connected to each other. The first outer shell and the second outer shell enclose the receiving cavity. The first outer shell has a second opening on the side opposite to the second outer shell. The driver is mounted on the first outer shell through the second opening. The bottom wall of the second outer shell has a mounting hole. The drive shaft is disposed in the mounting hole. The drive gear is disposed on the drive shaft.

8. The pump module as described in claim 7, characterized in that, The receiving cavity includes a first chamber, a second chamber, and a third chamber that are interconnected. The first chamber, the second chamber, and the third chamber are arranged along the second direction. The first outer shell has a first protrusion on the side away from the water inlet assembly, and the second outer shell has a second protrusion on the side away from the water inlet assembly. The first protrusion and the second protrusion enclose the first chamber. The first chamber is used to install the transmission gear and a part of the piston rod. The second chamber is used to install the first connector and another part of the piston rod. The third chamber is used to install the water inlet assembly.

9. The pump module as described in claim 7, characterized in that, The pump module further includes a buffer component. The outer periphery of the first housing is provided with a first connecting part, and the outer periphery of the second housing is provided with a second connecting part. The first connecting part and the second connecting part are connected through the buffer component to make the first housing and the second housing sealed together.

10. A dental flosser, characterized in that, It includes a water tank, a nozzle assembly, and a pump module as described in any one of claims 1 to 9, wherein the water tank is connected to the pump module, and the pump module is connected to the nozzle assembly.

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