Static sealed water pump and oral irrigator

Abstract

The utility model discloses a static sealing type water pump and an oral irrigator, and relates to the technical field of oral irrigators, the static sealing type water pump comprises a water pump support, a driving assembly and a pump body; the pump body comprises a pump shell, a connecting rod, a plunger, an elastic pump film, a water inlet assembly and a water outlet assembly. The pump shell is provided with a water pumping cavity and a first opening communicated with the water pumping cavity, the plunger is movably arranged in the first opening, and the elastic pump membrane is arranged between the plunger and the pump shell and can seal the first opening; according to the technical scheme, a water pump support, a driving assembly and a pump body are arranged in the static sealed water pump, wherein the driving assembly and the pump body are installed in the water pump support. The pump body comprises a pump shell, a connecting rod, a plunger, an elastic pump film, a water inlet assembly and a water outlet assembly. The elastic pump film is elastically arranged between the plunger and the pump shell and can seal the first opening. Static sealing is formed between the elastic pump membrane and the pump shell, and the service life of the static sealing type water pump and the water pick is prolonged.

Description

Technical Field

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

[0002] A water flosser is an auxiliary tool that uses pulsed water jets to clean teeth and the oral cavity. Its working principle involves using the impact force of a high-speed water jet under pressure, along with the pulsed or bubble-vibration impact of the water flow, to clean areas difficult to reach with a toothbrush, such as teeth, interdental spaces, and gingival sulcus. This cleaning method effectively removes food debris and bacteria from the tooth surface and deeply cleans between teeth and the gingival sulcus, thus maintaining oral health. In current technology, the static seal water pump used in water flossers typically has a movable seal between it and the pump body. This is prone to wear and leakage in static seal water pumps, resulting in a shorter lifespan for the water flosser. Utility Model Content

[0003] The main purpose of this invention is to provide a static sealed water pump and a water flosser, which aims to extend the service life of the static sealed water pump and the water flosser.

[0004] To achieve the above objectives, the present invention proposes a static sealed water pump, comprising: a water pump bracket, a drive assembly, and a pump body; the drive assembly is installed within the water pump bracket; the pump body is installed within the water pump bracket, and the pump body includes a pump casing, a connecting rod, a plunger, an elastic pump diaphragm, a water inlet assembly, and a water outlet assembly; the pump casing has a pumping chamber and an inlet, an outlet, and a first opening communicating with the pumping chamber; the water inlet assembly is located at the inlet, the water outlet assembly is located at the outlet, the plunger is movably located at the first opening, one end of the connecting rod is tractively connected to the plunger, and the other end is connected to the drive assembly; the elastic pump diaphragm is elastically disposed between the plunger and the pump casing and is capable of sealing the first opening.

[0005] In one embodiment, the pump body further includes an end cap, which covers the first opening. The elastic pump diaphragm is disposed between the end cap and the first opening and can cover the first opening. The end cap cooperates with the pump housing to limit the elastic pump diaphragm between the end cap and the pump housing. The end cap has an axially formed through hole for the plunger to pass through, and the plunger is movably disposed in the through hole.

[0006] In one embodiment, the elastic pump diaphragm has a sealing portion and a telescopic portion arranged radially and connected to each other. The telescopic portion is cylindrical, and the sealing portion is located on the outer periphery of the telescopic portion. The outer diameter of the sealing portion is larger than the inner diameter of the first opening. When the elastic pump diaphragm is located at the first opening, the sealing portion abuts against the end wall of the pump body near the first opening.

[0007] In one embodiment, the end cap includes a pressing part and a snap-fit ​​part disposed around the pressing part. The through hole is opened in the pressing part. When the end cap is closed on the first opening, the end cap is connected to the pump housing through the snap-fit ​​part, and the pressing part abuts against the sealing part.

[0008] In one embodiment, the water outlet assembly includes a water outlet connector and a first one-way valve disposed between the water outlet connector and the pump housing. The water outlet connector has a water outlet channel through which water flows out. The water outlet channel is connected to the water outlet through the first one-way valve, and the end of the water outlet channel away from the water outlet is connected to the atmosphere.

[0009] In one embodiment, the water inlet assembly includes a water inlet connector and a second one-way valve disposed between the water inlet connector and the pump housing. The water inlet connector has an inlet channel for water to flow in. The inlet channel is connected to the water inlet through the second one-way valve. One end of the inlet channel away from the water inlet is connected to a water source.

[0010] In one embodiment, the end of the plunger near the elastic pump diaphragm abuts against the elastic pump diaphragm, and a slot is formed at the end of the plunger near the connecting rod. One end of the connecting rod is rotatably inserted into the slot and is drivenly connected to the plunger through a connector. The end of the connecting rod away from the plunger is drivenly connected to the drive assembly.

[0011] In one embodiment, the drive assembly includes a motor, a transmission gear, and a gear shaft. The motor has a drive gear, and the gear shaft is fixedly mounted on the pump bracket. The transmission gear has an axially oriented through-hole for the gear shaft to pass through. The drive gear meshes with the transmission gear to drive the transmission gear to rotate around the gear shaft. The extension direction of the gear shaft intersects the axial direction of the pump body. The transmission gear has a turntable and an eccentric boss located on the turntable near the connecting rod. The turntable has an axially oriented first through-hole for the gear shaft to pass through, and the eccentric boss has a second through-hole for the gear shaft to pass through. The second through-hole is coaxial with the first through-hole and offset from the central axis of the eccentric boss. A limiting hole is located at the end of the connecting rod near the motor, and the eccentric boss is inserted into the limiting hole to connect with the eccentric boss.

[0012] In one embodiment, a circuit board is also included, which is mounted inside the water pump bracket and electrically connected to the motor.

[0013] This utility model also proposes a dental flosser, including the static sealed water pump described in any of the above claims.

[0014] The technical solution of this utility model adopts a water pump bracket and a drive assembly and pump body installed in the water pump bracket in a static sealed water pump. The pump body includes a pump casing, a connecting rod, a plunger, an elastic pump diaphragm, a water inlet assembly, and a water outlet assembly. The pump casing has a water pumping chamber and a water inlet, a water outlet, and a first opening communicating with the water pumping chamber. The water inlet is equipped with a water inlet assembly, and the water outlet is equipped with a water outlet assembly. The plunger is movably disposed in the first opening and is driven and connected to the drive assembly through the connecting rod. The elastic pump diaphragm is elastically disposed between the plunger and the pump casing and can seal the first opening. This allows the plunger to push against the elastic pump diaphragm under the action of the drive assembly, thereby changing the volume of the water pumping chamber to draw or pump out water. The elasticity of the elastic pump diaphragm itself allows it to wrap around the plunger, so that the plunger can move in the first opening sealed by the elastic pump diaphragm. This forms a static seal between the elastic pump diaphragm and the pump casing, avoiding the seal between the elastic pump diaphragm and the pump casing from easily wearing out and failing during the movement of the plunger, thus extending the service life of the static sealed water pump and the water purifier. 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 a static sealed water pump according to an embodiment of the present invention;

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

[0018] Figure 3 An exploded structural diagram of the pump body in one embodiment of the static sealed water pump provided by this utility model;

[0019] Figure 4 for Figure 1 Sectional view at point AA.

[0020] Explanation of icon numbers:

[0021] 100. Static sealed water pump; 1. Pump bracket; 2. Drive assembly; 21. Motor; 211. Drive gear; 22. Transmission gear; 221. Eccentric boss; 222. Turntable; 23. Gear shaft; 3. Pump body; 31. Pump casing; 32. Connecting rod; 33. Plunger; 331. Connector; 34. Elastic pump diaphragm; 341. Sealing part; 342. Telescopic part; 35. Inlet assembly; 351. Inlet connector; 352. Second check valve; 36. Outlet assembly; 361. Outlet connector; 362. First check valve; 37. End cover; 371. Pressing part; 372. Snap-fit ​​part; 4. Drive circuit.

[0022] 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

[0023] 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.

[0024] 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.

[0025] 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.

[0026] This utility model proposes a static sealed water pump 100.

[0027] Please see Figure 1-4 In one embodiment of this utility model, the static sealed water pump 100 includes: a water pump bracket 1, a drive assembly 2, and a pump body 3; the drive assembly 2 is installed inside the water pump bracket 1; the pump body 3 is installed inside the water pump bracket 1, and the pump body 3 includes a pump housing 31, a connecting rod 32, a plunger 33, an elastic pump diaphragm 34, a water inlet assembly 35, and a water outlet assembly 36; the pump housing 31 has a pumping chamber and a water inlet, a water outlet, and a first opening communicating with the pumping chamber; the water inlet assembly 35 is disposed at the water inlet; the water outlet assembly 36 is disposed at the water outlet; the plunger 33 is movably disposed at the first opening; one end of the connecting rod 32 is tractively connected to the plunger 33, and the other end is connected to the drive assembly 2; the elastic pump diaphragm 34 is elastically disposed between the plunger 33 and the pump housing 31, and can seal the first opening.

[0028] In this embodiment, the pump housing 31 has a pumping chamber capable of holding a certain amount of water. The change in the amount of water stored in the pumping chamber is achieved through the cooperation of the plunger 33 and the elastic pump diaphragm 34. The plunger 33 pushes the elastic pump diaphragm 34 to extend and retract, causing the volume of the pumping chamber to alternately increase and decrease, thereby allowing clean water to be pumped in and out alternately. The elastic pump diaphragm 34 is deformable and can undergo elastic deformation under external force. The elastic pump diaphragm 34 is sealed to the pump housing 31. The diameter of the plunger 33 is smaller than the inner diameter of the first opening. When the plunger 33 reciprocates at the first opening, the gap between the outer wall of the plunger 33 and the inner wall of the first opening can be sealed by the elastic pump diaphragm 34 through its own elasticity. At this time, there is no relative displacement between the elastic pump diaphragm 34 and the end wall of the pump housing 31 near the first opening, and they are relatively stationary, thus forming a static sealing structure. This makes the seal between the elastic pump diaphragm 34 and the first opening of the pump body 3 less prone to wear and failure due to frequent back-and-forth movements during long-term use of the product, thereby extending the service life of the statically sealed pump body 3. In addition, by using the elastic pump diaphragm 34 for static sealing, the outer diameter of the plunger 33 can be set to be smaller, which facilitates its back-and-forth movement in the first opening and avoids friction with the inner wall of the first opening that could lead to seal failure, thereby further extending the service life of the static seal pump 100.

[0029] The technical solution of this utility model involves a static sealed water pump 100 comprising a pump bracket 1, a drive assembly 2, and a pump body 3 installed within the pump bracket 1. The pump body 3 includes a pump housing 31, a connecting rod 32, a plunger 33, an elastic pump diaphragm 34, a water inlet assembly 35, and a water outlet assembly 36. The pump housing 31 has a pumping chamber and a water inlet, a water outlet, and a first opening communicating with the pumping chamber. The water inlet is provided with the water inlet assembly 35, and the water outlet is provided with the water outlet assembly 36. The plunger 33 is movably disposed in the first opening and is driven and connected to the drive assembly 2 via the connecting rod 32. The elastic pump diaphragm 34 is elastic. The plunger 33 is positioned between the plunger 33 and the pump housing 31 and can seal the first opening. This allows the plunger 33 to push against the elastic pump diaphragm 34 under the action of the drive assembly 2, thereby changing the volume of the pump chamber and drawing or pumping out water. The elasticity of the elastic pump diaphragm 34 allows it to wrap around the plunger 33, enabling the plunger 33 to move within the first opening sealed by the elastic pump diaphragm 34. This creates a static seal between the elastic pump diaphragm 34 and the pump housing 31, preventing the seal between the elastic pump diaphragm 34 and the pump housing 31 from easily failing due to wear during the movement of the plunger 33, and extending the service life of the static seal water pump 100 and the flushing device.

[0030] In one embodiment, the pump body 3 further includes an end cap 37, which covers the first opening. The elastic pump diaphragm 34 is disposed between the end cap 37 and the first opening and can cover the first opening. The end cap 37 cooperates with the pump housing 31 to limit the elastic pump diaphragm 34 between the end cap 37 and the pump housing 31. The end cap 37 has an axially formed through hole for the plunger 33 to pass through, and the plunger 33 is movably disposed in the through hole. The end cap 37 is used to limit the elastic pump diaphragm 34 at the first opening and can continuously apply pressure to the elastic pump diaphragm 34 from the side of the elastic pump diaphragm 34 away from the pump body 3, so as to continuously press the elastic pump diaphragm 34 against the end wall of the first opening.

[0031] In one embodiment, the elastic pump diaphragm 34 has a sealing portion 341 and a telescopic portion 342 arranged radially and connected to each other. The telescopic portion 342 is cylindrical, and the sealing portion 341 is located on the outer periphery of the telescopic portion 342. The outer diameter of the sealing portion 341 is larger than the inner diameter of the first opening. When the elastic pump diaphragm 34 is placed in the first opening, the sealing portion 341 abuts against the end wall of the pump body 3 near the first opening. The sealing portion 341 and the telescopic portion 342 are integrally formed or mutually sealed. The telescopic portion 342 is cylindrical, and the sealing portion 341 is annularly arranged around the periphery of the telescopic portion 342. When the elastic pump diaphragm 34 is installed, the sealing portion 341 abuts against the end wall on the outer periphery of the first opening. Since the outer diameter of the sealing portion 341 is larger than the inner diameter of the first opening, the elastic pump diaphragm 34 can completely cover the first opening to seal it. The telescopic part 342 has great elasticity and can extend into the pump water chamber under the pushing action of the plunger 33, thereby changing the volume of the pump water chamber.

[0032] In one embodiment, the end cap 37 includes a pressing part 371 and a snap-fit ​​part 372 disposed around the pressing part 371. The through hole is formed in the pressing part 371. When the end cap 37 is closed over the first opening, the end cap 37 is connected to the pump housing 31 through the snap-fit ​​part 372, and the pressing part 371 abuts against the sealing part 341. The pressing part 371 is used to continuously press the sealing part 341 in the elastic pump diaphragm 34 against the end wall around the first opening to achieve a continuous sealing effect. The pump housing 31 is provided with an end cap 37 on the outer periphery corresponding to the first opening, which is detachably connected to the pump body 3 through the snap-fit ​​part 372, so as to facilitate the removal of the end cap 37 to replace the sealing connector 331, thereby extending the service life of the static sealing water pump 100.

[0033] In one embodiment, the water outlet assembly 36 includes a water outlet connector 361 and a first one-way valve 362 disposed between the water outlet connector 361 and the pump housing 31. The water outlet connector 361 has a water outlet channel for water flow, which is connected to the water outlet through the first one-way valve 362. The end of the water outlet channel away from the water outlet is open to the atmosphere. The first one-way valve 362 is used to restrict the flow direction of water at the water outlet, so that water can only flow from the pump chamber through the water outlet assembly 36 to the outside, and cannot flow in the opposite direction. A long and thin pipe can be provided at the end of the water outlet channel away from the pump chamber to give the water pumped by the pump a certain impact force.

[0034] In one embodiment, the water inlet assembly 35 includes a water inlet connector 351 and a second one-way valve 352 disposed between the water inlet connector 351 and the pump housing 31. The water inlet connector 351 has an inlet channel for water to flow in, and the inlet channel is connected to the water inlet via the second one-way valve 352. The end of the inlet channel away from the water inlet is connected to a water source. The second one-way valve 352 is used to restrict the flow direction of water at the water inlet, so that water can only flow into the pump chamber from the water inlet assembly. The end of the inlet channel away from the pump chamber can be connected to a water source located outside the pump body 3 through a pipe to pump clean water into the pump chamber under atmospheric pressure.

[0035] In one embodiment, the plunger 33 abuts against the elastic pump diaphragm 34 at one end near the diaphragm 34, and a slot is formed at the end of the plunger 33 near the connecting rod 32. One end of the connecting rod 32 is rotatably inserted into the slot and is drivenly connected to the plunger 33 via a connector 331. The end of the connecting rod 32 away from the plunger 33 is drivenly connected to the drive assembly 2. The slot is used to fix the plunger 33 to the connecting rod 32, so that the connecting rod 32 can push the plunger 33 to reciprocate axially through the slot and the connector 331 to push against the elastic pump diaphragm 34. The slot extends radially along the plunger 33, and the connecting rod 32 extends axially. The end of the connecting rod 32 near the plunger 33 has a socket for the connector 331 to be inserted. The side walls of the slot also have sockets for the connector 331 to pass through. After the connecting rod 32 is inserted into the slot, the connector 331 is simultaneously passed through the sockets on both side walls of the slot and the socket on the connecting rod 32, thus connecting the connecting rod 32 to the plunger 33 and preventing the end of the connecting rod 32 near the plunger 33 from moving radially. The end of the connecting rod 32 near the plunger 33 can reciprocate axially, and the connector 331 pushes the plunger 33 to follow the connecting rod 32 in reciprocating axial motion.

[0036] In one embodiment, the drive assembly 2 includes a motor 21, a transmission gear 22, and a gear shaft 23. The motor 21 has a drive gear 211, and the gear shaft 23 is fixedly mounted on the pump bracket 1. The transmission gear 22 has an axial through hole for the gear shaft 23 to pass through. The drive gear 211 meshes with the transmission gear 22 to drive the transmission gear 22 to rotate around the gear shaft 23. The extension direction of the gear shaft 23 intersects the axial direction of the pump body 3. The transmission gear 22 has a turntable 222 and an eccentric boss 221 is provided on the side of the turntable 222 near the connecting rod 32. The turntable 222 has a first through hole for the gear shaft 23 to pass through in the axial direction, and the eccentric boss 221 has a second through hole for the gear shaft 23 to pass through. The second through hole is coaxial with the first through hole and offset from the central axis of the eccentric boss 221. A limiting hole is provided at the end of the connecting rod 32 near the motor 21, and the eccentric boss 221 is inserted into the limiting hole to connect with the eccentric boss 221. The turntable 222 and the eccentric boss 221 are integrally set or fixedly connected by welding or other means. The outer circumference of the turntable 222 is provided with gear teeth. The motor 21 drives the turntable 222 to rotate around the gear shaft 23 through the gear teeth of the turntable 222, thereby driving the eccentric boss 221 on the turntable 222 to rotate eccentrically around the gear shaft 23. The eccentric boss 221 can drive the connecting rod 32 to reciprocate along the axial direction of the pump body 3, thereby driving the plunger 33 to reciprocate back and forth along the axial direction.

[0037] In one embodiment, a circuit board 4 is also included. The circuit board 4 is installed inside the water pump bracket 1 and is electrically connected to the motor 21. The water pump bracket 1 also has a mounting cavity at a position avoiding the limiting groove. The mounting cavity and the limiting groove are spaced apart from each other and are not interconnected, so as to separate the pump body 3 from the circuit board 4 and prevent water in the pump body 3 from damaging the circuit board 4. The circuit board 4 is used to drive the motor 21 to work in a preset manner under the action of an electrical signal, so as to drive the pump body 3 to pump water out in a preset manner or frequency.

[0038] This utility model also proposes a dental flosser, which includes the statically sealed water pump 100 described in any of the above embodiments. The specific structure of the statically sealed water pump 100 is as described in the above embodiments. Since this dental 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 dental flosser has a water storage tank, which is connected to the water inlet channel in the water inlet assembly 35 through a flexible hose to replenish clean water to the pump water chamber. By setting the statically sealed water pump 100, a static seal is achieved at the corresponding openings of the plunger 33 and the pump housing 31, making the dental flosser less prone to leakage due to repeated friction of the plunger 33 against the pump housing 31, thereby extending the service life of the dental flosser.

[0039] 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 static seal water pump characterized by, The utility model provides a water pump, comprising: a water pump bracket; a driving assembly installed in the water pump bracket; and a pump body installed in the water pump bracket, the pump body comprising a pump shell, a connecting rod, a plunger, an elastic pump membrane, a water inlet assembly and a water outlet assembly; the pump shell is provided with a pump water cavity, a water inlet, a water outlet and a first opening which are in communication with the pump water cavity; the water inlet assembly is arranged at the water inlet; the water outlet assembly is arranged at the water outlet; the plunger is movably arranged at the first opening; one end of the connecting rod is drivingly connected to the plunger; the other end of the connecting rod is connected to the driving assembly; the elastic pump membrane is elastically arranged between the plunger and the pump shell and can seal the first opening. The pump body further comprises an end cover, the end cover is arranged at the first opening; the elastic pump membrane is arranged between the end cover and the first opening and can cover the first opening; the end cover and the pump shell cooperate to limit the elastic pump membrane between the end cover and the pump shell; the end cover is provided with a through hole along the axial direction for the plunger to pass through; the plunger is movably arranged in the through hole.

2. The static seal water pump of claim 1, wherein, The elastic pump membrane has a sealing part and an expansion part which are arranged along the radial direction and are connected to each other; the expansion part is cylindrically arranged; the sealing part is located at the outer periphery of the expansion part; the outer diameter of the sealing part is greater than the inner diameter of the first opening; when the elastic pump membrane is arranged at the first opening, the sealing part abuts against the end wall of the pump body which is close to the first opening.

3. The static seal water pump of claim 2, wherein, The end cover comprises a pressing part and a clamping part arranged at the periphery of the pressing part; the through hole is arranged at the pressing part; when the end cover is arranged at the first opening, the end cover is connected to the pump shell through the clamping part; the pressing part abuts against the sealing part.

4. The static seal water pump of claim 3, wherein, The water outlet assembly comprises a water outlet connector and a first one-way valve arranged between the water outlet connector and the pump shell; the water outlet connector is provided with a water outlet channel for water flow to flow out; the water outlet channel is connected to the water outlet through the first one-way valve; one end of the water outlet channel away from the water outlet is connected to the atmosphere.

5. The static seal water pump of claim 1, wherein, The water inlet assembly comprises a water inlet connector and a second one-way valve arranged between the water inlet connector and the pump shell; the water inlet connector is provided with a water inlet channel for water flow to flow in; the water inlet channel is connected to the water inlet through the second one-way valve; one end of the water inlet channel away from the water inlet is connected to a water source.

6. The sealed centrifugal pump of claim 1, wherein, One end of the plunger close to the elastic pump membrane abuts against the elastic pump membrane; one end of the plunger close to the connecting rod is provided with a slot; one end of the connecting rod is rotatably arranged in the slot and is drivingly connected to the plunger through a connecting piece; one end of the connecting rod away from the plunger is drivingly connected to the driving assembly.

7. The static seal water pump of claim 1, wherein The driving assembly comprises a motor, a transmission gear and a gear shaft; the motor is provided with a driving gear; the gear shaft is fixedly installed in the water pump bracket; the transmission gear is provided with a through hole along the axial direction for the gear shaft to pass through; the driving gear is meshingly connected to the transmission gear to drive the transmission gear to rotate around the gear shaft; the extension direction of the gear shaft intersects the axial direction of the pump body.

8. The static seal water pump of claim 1, wherein, ​ The transmission gear has a rotating disc, and an eccentric boss is arranged on one side of the rotating disc close to the connecting rod. The rotating disc is provided with a first through hole for the gear shaft to pass through in the axial direction. The eccentric boss is provided with a second through hole for the gear shaft to pass through. The second through hole is coaxially arranged with the first through hole, and the second through hole is offset from the central axis of the eccentric boss. The connecting rod is provided with a limiting hole at one end close to the motor. The eccentric boss is inserted into the limiting hole to be connected with the eccentric boss.

9. The static seal water pump of claim 8, wherein, The circuit board is installed in the water pump support and is electrically connected with the motor.

10. An oral irrigator characterized by, The static sealed water pump comprises the static sealed water pump according to any one of claims 1 to 9.

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