CN116517823A - Water pump for tooth-flushing device - Google Patents

Abstract

The application relates to a tooth-flushing device water pump, which belongs to the technical field of tooth-flushing devices. The tooth-flushing device water pump comprises a shell, a first cylinder body, a piston, a second cylinder body, a wear-resisting block and a driving assembly; the shell comprises a first water outlet; the piston comprises a movable head and an extension rod, the movable head is positioned at the inner side of the first cylinder body, and the extension rod is positioned at one side of the movable head, which is away from the first water outlet; the extension rod extends to the inner side of the second cylinder body; the wear-resistant block is positioned at the inner side of the second cylinder body and is in sliding fit with the inner wall of the second cylinder body; the driving assembly comprises a driving piece, an eccentric gear and a connecting rod, wherein the driving piece drives the eccentric gear to rotate, two ends of the connecting rod are respectively connected with the eccentric gear and the wear-resisting block in a rotating way, and the driving piece pushes the piston to move along a first direction. The tooth-flushing device water pump provided by the embodiment of the application can slow down the abrasion rate of the piston and prolong the service life of the piston.

Description

Water pump for tooth-flushing device

Technical Field

The application relates to the technical field of tooth flushers, in particular to a tooth flusher water pump.

Background

With the increasing importance of people on tooth health, the demand of the punch product is continuously increasing. The water pump water leakage and insufficient pressure problems commonly occur in the use of the product. The core component of the tooth-washing device is a water pump. The principle of the water pump is that the piston reciprocates, and negative pressure appears in the water pump cylinder body; the water is sucked from the water inlet and then sprayed from the water outlet by utilizing the atmospheric pressure principle. The water pump of the existing tooth washer generally drives the piston to move in the cylinder body through the cooperation of the rotating motor and the cam so as to push water flow to spray out, when the cam rotates, the force applied to the piston is inclined to the moving direction of the piston, and the component force different from the moving direction can increase the friction force between the piston and the cylinder body, so that the piston wear rate is high, and the service life of the piston is short.

Disclosure of Invention

The purpose of the present application is to provide a water pump for a tooth cleaner, which can slow down the wear rate of a piston, prolong the service life of the piston, and improve the problems.

The application provides a tooth-flushing device water pump, which comprises a shell, a first cylinder body, a piston, a second cylinder body, a wear-resisting block and a driving assembly; the shell comprises a first water outlet; a first cylinder; the piston comprises a movable head and an extension rod, the movable head is positioned at the inner side of the first cylinder body, and the extension rod is positioned at one side of the movable head away from the first water outlet; a second cylinder, the extension rod extending to an inside of the second cylinder; the wear-resistant block is positioned at the inner side of the second cylinder body and is in sliding fit with the inner wall of the second cylinder body; the driving assembly comprises a driving piece, an eccentric gear and a connecting rod, wherein the driving piece drives the eccentric gear to rotate, two ends of the connecting rod are respectively connected with the eccentric gear and the wear-resistant block in a rotating way, the driving piece drives the wear-resistant block to reciprocate along a first direction through the connecting rod, and the wear-resistant block pushes the piston to move along the first direction; the space, which is positioned at one side of the movable head, which is close to the first water outlet, on the inner side of the first cylinder body is a first cavity, the first cavity is used for containing tooth-flushing liquid, the first cavity is communicated with the first water outlet, and the movable head moves to push the liquid in the first cavity to the first water outlet.

In the technical scheme of this embodiment, the driving piece drives eccentric gear and rotates, there is the clearance between the one end that the connecting rod deviates from the wear-resisting piece and the rotation center department of eccentric gear, eccentric gear rotates the one end that promotes the connecting rod and deviates from the wear-resisting piece and rotate around eccentric gear's rotation center, the direction of thrust (or pulling force) that the connecting rod applyed in the wear-resisting piece changes along with eccentric gear's rotation, thrust (or pulling force) that the connecting rod applyed in the wear-resisting piece can be split into the force that is on a parallel with first direction and the force of perpendicular to first direction, the wear-resisting piece can offset the force of perpendicular to first direction through the mutual extrusion between self and the second jar body inner wall, then remove along first direction under the promotion of the force that is on a parallel with first direction, thereby drive the piston removes along first direction, make the piston only receive the force that is on a parallel with first direction from the connecting rod, reduce the frictional force between the inner wall of activity head and first cylinder body, thereby slow down the wear rate of piston, the life of piston is prolonged, the risk that the tooth is leaked because of the piston is damaged to the tooth to the reduction.

In some embodiments, a first seal is also included, the first seal being located between the movable head and an inner wall of the first cylinder.

In the technical scheme of this application embodiment, first sealing member sets up between the inner wall of activity head and first cylinder body, strengthens the sealed effect between the inner wall of activity head and first cylinder body, reduces the risk that liquid in the first cavity revealed.

In some embodiments, the device further comprises a third cylinder body, wherein the third cylinder body is positioned between the first cylinder body and the second cylinder body, the third cylinder body is communicated with the first cylinder body, the third cylinder body is in sealing connection with the first cylinder body, and the extension rod penetrates through the third cylinder body to enter the second cylinder body.

In the technical scheme of this application embodiment, the extension rod passes the third cylinder body and gets into the second cylinder body, makes the piston can be located the structure inboard that first cylinder body, second cylinder body and third body of rod combination formed, reduces the piston activity and brings the risk that liquid brought the water leakage.

In some embodiments, a second seal is disposed between the extension rod, the third cylinder, and the second cylinder.

In the technical scheme of this application embodiment, the second sealing member sets up between extension rod, third cylinder body and second cylinder body, strengthens the sealed effect between extension rod, third cylinder body and the second cylinder body, reduces the risk that liquid in the third cylinder body was revealed to the outside or third cylinder body.

In some embodiments, the device further comprises a fourth cylinder disposed between the first cylinder and the first water outlet, the fourth cylinder in communication with the first cavity through the second water outlet.

In the technical scheme of this application embodiment, liquid is stopped in the fourth cylinder body before being spouted towards tooth ware earlier, makes liquid assemble and is spouted again after thicker water stream, promotes the washing effect of liquid.

In some embodiments, the movable head is away from the surface of the first water outlet, the inner wall of the first cylinder body, and the inner wall of the third cylinder body enclose a second cavity, the third cylinder body is provided with a third water outlet communicated with the second cavity, the fourth cylinder body is provided with a first water inlet, the third water outlet is communicated with the first water inlet through a first pipeline, and the first cylinder body is provided with a second water inlet communicated with the first cavity.

In the technical scheme of this embodiment, when the piston wearing and tearing, in liquid in the first cavity can reveal to the second cavity, when the movable head orientation deviates from the direction of first delivery port and removes, the second cavity reduces, the atmospheric pressure in the second cavity increases, reveal to the liquid in the second cavity can be pushed by atmospheric pressure and get into first pipeline, then get into the fourth jar body and be spouted, reduce the risk that liquid revealed to the outside, make the tooth-flushing device water pump that this application provided can continue to work after the wearing and tearing of piston, promote the life of tooth-flushing device water pump.

In some embodiments, the device further comprises a second pipeline connected with a source of liquid for tooth cleaning, the third cylinder is provided with a third water inlet communicated with the second cavity, the third water inlet is communicated with the second pipeline, and the second water inlet is communicated with the second pipeline.

In the technical scheme of this embodiment, the second pipeline of tooth washer water pump that this application provided can be through second water inlet to first cavity input liquid, can promote the liquid in the first cavity and get into fourth cylinder when making the activity head remove towards first delivery port, then spout through first delivery port, simultaneously, the second pipeline can be through third water inlet to second cavity input liquid, make the activity head can promote the liquid in the second cavity and get into fourth cylinder through first pipeline when deviating from first delivery port removal, then spout through first delivery port, the reciprocating motion of piston can accomplish twice water spraying operation, reduce the required number of times of carrying out of water spraying operation of rated quantity of piston completion, reduce the number of times and the frequency that the piston rubs with the inner wall of first cylinder, make the difficult wearing and tearing of first sealing member, improve the life of the subassembly that piston and first sealing member constitute.

In some embodiments, a first one-way valve is disposed at the second water outlet, the first one-way valve being configured to restrict liquid in the fourth cylinder from entering the first cavity; a second one-way valve is arranged at the second water inlet and is used for limiting liquid in the first cavity to enter the second pipeline; a third one-way valve is arranged at the third water outlet and is used for limiting liquid in the fourth cylinder body to enter the second cavity; the third water inlet is provided with a fourth one-way valve, and the fourth one-way valve is used for limiting liquid in the second cavity to enter the second pipeline.

In the technical scheme of the embodiment of the application, when the piston moves towards the first water outlet, the first one-way valve is opened, the second one-way valve is closed, the volume of the first cavity is reduced, the internal air pressure is increased, liquid in the first cavity is pushed into the fourth cylinder to perform water spraying operation, meanwhile, the third one-way valve is closed, the fourth one-way valve is opened, the volume of the second cavity is increased, the internal air pressure is reduced, and the liquid in the second pipeline is sucked into the second cavity under the action of pressure difference;

when the piston deviates from the first water outlet and moves, the first one-way valve is closed, the second one-way valve is opened, the volume of the first cavity is increased, the internal air pressure is reduced, liquid in the second pipeline is sucked into the first cavity under the action of pressure difference, meanwhile, the third one-way valve is opened, the fourth one-way valve is closed, the volume of the second cavity is reduced, the internal air pressure is increased, and the liquid in the second cavity is pushed into the fourth cylinder to perform water spraying operation.

In some embodiments, the second water inlet comprises a first hole section and a second hole section, the second hole section is opposite to the first hole section and has a larger aperture than the first hole section, the second pipeline stretches into the second hole section, the inner side of the second pipeline has a smaller aperture than the second hole section, a first table top is formed between the inner wall of the first hole section and the inner wall of the second hole section, and a second table top is formed between the inner wall of the second pipeline and the inner wall of the second hole section;

the second one-way valve comprises a valve body and a spring, the outer peripheral surface of the valve body is in contact with the inner wall of the second hole section, the spring is respectively abutted against the first table top and the valve body, and the valve body is pushed by the spring to be abutted against the second table top.

In the technical scheme of the embodiment of the application, when the air pressure in the first cavity is normal or larger, the valve body is abutted with the second table top under the pushing of the spring so as to limit the water flow in the first cavity to enter the second pipeline through the second water inlet; when the air pressure in the first cavity is smaller, the air pressure difference pushes liquid in the second pipeline to increase the pushing force of the valve body, when the pushing force is larger than the elastic force applied to the valve body by the spring, the valve body moves towards the spring under the action of the pushing force, so that the spring is extruded and contracted, a gap is formed between the valve body and the second table top, and the liquid enters the second hole section and the first hole section through the gap and then is supplemented to the first cavity.

In some embodiments, a first groove is formed on the outer peripheral surface of the valve body, and a plurality of first grooves are distributed around the axis of the valve body; the first table top is further provided with a boss extending from the first hole section towards the second hole section, and the boss limits the valve body to be in contact with the first table top; the boss is provided with a plurality of second grooves for liquid to pass through.

In the technical scheme of this application embodiment, when the valve body is pushed by liquid and moves towards first cavity, the boss can support the valve body in order to avoid valve body and first mesa contact, guarantees that liquid can pass through the first cavity of second hole Duan Jinru via first recess and second recess.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a housing of a water pump for a dental appliance according to some embodiments of the present application;

FIG. 2 is a schematic view of the inside of a housing provided in some embodiments of the present application;

FIG. 3 is a cross-sectional view of a water pump for a dental irrigator provided in some embodiments of the present application;

fig. 4 is an enlarged view at a in fig. 3;

FIG. 5 is a schematic view of a valve body according to some embodiments of the present disclosure;

fig. 6 is a schematic structural view of a second water inlet according to some embodiments of the present disclosure.

Icon: 1-a housing; 10-a first housing; 11-a second housing; 12-an electric motor; 13-a first water outlet; 14-a first seal; 15-a second seal; 16-a first conduit; 17-a second conduit; 170-a second mesa; 2-a first cylinder; 20-a first cavity; 21-a second water outlet; 210-a first one-way valve; 22-a second water inlet; 220-a second one-way valve; 2200-a valve body; 22000-first grooves; 2201-springs; 221-a first bore section; 222-a second bore section; 223-first mesa; 224-boss; 2240-second grooves; 3-piston; 30-moving head; 31-an extension rod; 4-a second cylinder; 5-a wear-resistant block; 6-a drive assembly; 60-driving member; 61-eccentric gear; 62-connecting rod; 7-a third cylinder; 70-a second cavity; 71-a third water outlet; 710—a third one-way valve; 72-a third water inlet; 720-fourth one-way valve; 8-a fourth cylinder; 80-a first water inlet; x-first direction.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

The term "plurality" as used herein refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

According to some embodiments of the present application, as shown in fig. 1-3, there is provided a dental impactor water pump comprising a housing 1, a first cylinder 2, a piston 3, a second cylinder 4, a wear block 5, and a drive assembly 6; the housing 1 comprises a first water outlet 13; a first cylinder 2; the piston 3 comprises a movable head 30 and an extension rod 31, the movable head 30 is positioned at the inner side of the first cylinder body 2, and the extension rod 31 is positioned at one side of the movable head 30 away from the first water outlet 13; a second cylinder 4, the extension rod 31 extending to the inside of the second cylinder 4; the wear-resistant block 5 is positioned at the inner side of the second cylinder body 4 and is in sliding fit with the inner wall of the second cylinder body 4; the driving assembly 6 comprises a driving piece 60, an eccentric gear 61 and a connecting rod 62, wherein the driving piece 60 drives the eccentric gear 61 to rotate, two ends of the connecting rod 62 are respectively connected with the eccentric gear 61 and the wear-resistant block 5 in a rotating way, the driving piece 60 drives the wear-resistant block 5 to reciprocate along a first direction X through the connecting rod 62, and the wear-resistant block 5 pushes the piston 3 to move along the first direction X; the space on the inner side of the first cylinder body 2, which is positioned on one side of the movable head 30 near the first water outlet 13, is a first cavity 20, the first cavity 20 is used for containing tooth-rinsing liquid, the first cavity 20 is communicated with the first water outlet 13, and the movable head 30 moves to push the liquid in the first cavity 20 to the first water outlet 13.

The housing 1 may include a first case 10 and a second case 11, and the first case 10 and the second case 11 are assembled into a case by screw fastening.

The X direction as shown is the first direction X.

The first water outlet 13 may be provided at one side of the housing 1 in the first direction X.

Also provided within the housing 1 is a motor 12, the motor 12 being located on a side of the first direction X facing away from the first water outlet 13, the motor 12 being arranged to provide kinetic energy to the driving member 60.

The movable head 30 may be fitted to the inner wall of the first cylinder 2.

The length direction of the extension rod 31 is parallel to the first direction X.

The extension rod 31 may be attached to the wear block 5 by means of a pin.

The connecting rod 62 may be spherically constrained with the wear block 5.

The driving piece 60 drives the eccentric gear 61 to rotate, a gap exists between one end of the connecting rod 62, which is away from the wear-resistant block 5, and the rotation center of the eccentric gear 61, the eccentric gear 61 rotates to push one end of the connecting rod 62, which is away from the wear-resistant block 5, to rotate around the rotation center of the eccentric gear 61, the direction of pushing force (or pulling force) applied by the connecting rod 62 to the wear-resistant block 5 is changed along with the rotation of the eccentric gear 61, the pushing force (or pulling force) applied by the connecting rod 62 to the wear-resistant block 5 can be split into a force parallel to the first direction X and a force perpendicular to the first direction X, the wear-resistant block 5 can offset the force perpendicular to the first direction X through mutual extrusion between the wear-resistant block 5 and the inner wall of the second cylinder 4, and then the piston 3 is driven to move along the first direction X under the pushing of the force parallel to the first direction X, so that the piston 3 is driven to move along the first direction X, the piston 3 only receives the force parallel to the first direction X from the connecting rod 62, the friction force between the movable head 30 and the inner wall of the first cylinder 2 is reduced, the wear rate of the piston 3 is slowed down, the service life of the piston 3 is prolonged, and the risk of damaging the piston 3 due to the piston 3 is reduced.

Optionally, as shown in fig. 3, a first sealing member 14 is further included, the first sealing member 14 being located between the movable head 30 and the inner wall of the first cylinder 2.

The first seal 14 is a material or part that prevents leakage of fluid or solid particles from between adjacent bonding surfaces and prevents intrusion of foreign matter such as dust and moisture into the interior of the machine.

The first sealing member 14 may be solid, and the material of the first sealing member 14 may be, but is not limited to, rubber, resin, etc.; the first sealing member 14 may be a gel, and the material of the first sealing member 14 may be, but not limited to, silicone sealant, polyurethane sealant, polysulfide sealant, acrylic sealant, anaerobic sealant, epoxy sealant, butyl sealant, chlorine Ding Mifeng sealant, polyvinyl chloride sealant, asphalt sealant, etc.

The first sealing member 14 is arranged between the movable head 30 and the inner wall of the first cylinder body 2, so that the sealing effect between the movable head 30 and the inner wall of the first cylinder body 2 is enhanced, and the risk of liquid leakage in the first cavity 20 is reduced.

Optionally, as shown in fig. 2 to 3, the device further comprises a third cylinder 7, the third cylinder 7 is located between the first cylinder 2 and the second cylinder 4, the third cylinder 7 is communicated with the first cylinder 2, the third cylinder 7 is in sealing connection with the first cylinder 2, and the extension rod 31 passes through the third cylinder 7 and enters the second cylinder 4.

The third cylinder 7 is in sealing connection with the first cylinder 2 (provided with a seal or a sealing coating, etc.).

The extension rod 31 passes through the third cylinder 7 and enters the second cylinder 4, so that the piston 3 can be positioned at the inner side of the structure formed by combining the first cylinder 2, the second cylinder 4 and the third rod body, and the risk of water leakage caused by the movement of the piston 3 to bring liquid out is reduced.

Optionally, as shown in fig. 3, a second seal 15 is provided between the extension rod 31, the third cylinder 7 and the second cylinder 4.

The second seal 15 is a material or a part that prevents leakage of fluid or solid particles from between adjacent joint surfaces and prevents intrusion of foreign matters such as dust and moisture into the interior of the machine.

The second sealing member 15 may be solid, and the material of the second sealing member 15 may be, but is not limited to, rubber, resin, etc.; the second sealing member 15 may be a gel, and the material of the second sealing member 15 may be, but not limited to, silicone sealant, polyurethane sealant, polysulfide sealant, acrylic sealant, anaerobic sealant, epoxy sealant, butyl sealant, chlorine Ding Mifeng sealant, polyvinyl chloride sealant, asphalt sealant, and the like.

The second sealing member 15 is arranged between the extension rod 31, the third cylinder 7 and the second cylinder 4, so that the sealing effect among the extension rod 31, the third cylinder 7 and the second cylinder 4 is enhanced, and the risk that liquid in the third cylinder 7 leaks to the outside or the third cylinder 7 is reduced.

Optionally, as shown in fig. 2 to 3, the device further comprises a fourth cylinder 8, the fourth cylinder 8 is arranged between the first cylinder 2 and the first water outlet 13, the fourth cylinder 8 is communicated with the first water outlet 13, and the fourth cylinder 8 is communicated with the first cavity 20 through the second water outlet 21.

The fourth cylinder 8 may be fixedly connected to the inner wall of the housing 1.

The fourth cylinder 8 may be in sealing connection with the first cylinder 2 (a seal or a sealing coating or the like is provided).

The liquid stays in the fourth cylinder body 8 before being sprayed out of the tooth-flushing device, so that the liquid is converged into a thicker water stream and then sprayed out, and the flushing effect of the liquid is improved.

Optionally, as shown in fig. 3, the surface of the movable head 30 facing away from the first water outlet 13, the inner wall of the first cylinder 2, and the inner wall of the third cylinder 7 enclose a second cavity 70, the third cylinder 7 is provided with a third water outlet 71 communicating with the second cavity 70, the fourth cylinder 8 is provided with a first water inlet 80, the third water outlet 71 is communicated with the first water inlet 80 through a first pipeline 16, and the first cylinder 2 is provided with a second water inlet 22 communicating with the first cavity 20.

The third outlet 71 may be in sealing connection (with a sealing element or a sealing coating, etc.) with the first conduit 16.

When the piston 3 wears, liquid in the first cavity 20 can leak to the second cavity 70, when the movable head 30 moves towards the direction that deviates from the first delivery port 13, the second cavity 70 reduces, the atmospheric pressure in the second cavity 70 increases, the liquid that leaks to the second cavity 70 can be pushed by the atmospheric pressure and get into first pipeline 16, then get into fourth cylinder 8 and be spouted, reduce the risk that liquid was revealed to the outside, make the tooth-cleaning pump that this application provided can continue to work after the wearing and tearing of piston 3, promote the life of tooth-cleaning pump.

Optionally, as shown in fig. 1 to 3, the device further comprises a second pipeline 17, the second pipeline 17 is connected with a source of liquid for tooth cleaning, a third water inlet 72 communicated with the second cavity 70 is formed in the third cylinder 7, the third water inlet 72 is communicated with the second pipeline 17, and the second water inlet 22 is communicated with the second pipeline 17.

The second water inlet 22 may be in sealing connection (provided with a sealing element or a sealing coating, etc.) with the second pipe 17.

The third water inlet 72 may be in sealing connection (provided with a sealing element or a sealing coating, etc.) with the second pipe 17.

Reference herein to one reciprocation of the piston 3 is to a process of moving the piston 3 towards the first water outlet 13 plus a process of moving the piston 3 away from the first water outlet 13

The second pipeline 17 of the existing water pump can finish water spraying operation by performing one-time reciprocating motion on the piston 3 of the water pump, liquid can be input into the first cavity 20 through the second water inlet 22, the liquid in the first cavity 20 can be pushed to enter the fourth cylinder 8 when the movable head 30 moves towards the first water outlet 13, then the liquid is sprayed out through the first water outlet 13, meanwhile, the second pipeline 17 can input the liquid into the second cavity 70 through the third water inlet 72, the liquid in the second cavity 70 can be pushed to enter the fourth cylinder 8 through the first pipeline 16 when the movable head 30 moves away from the first water outlet 13, then the liquid is sprayed out through the first water outlet 13, one-time reciprocating motion of the piston 3 can finish two-time water spraying operation, the number of times of reciprocating motion required by the rated number of water spraying operation of the piston 3 is reduced, the number of times and the frequency of friction between the piston 3 and the inner wall of the first cylinder 2 are reduced, the first sealing element 14 is not easy to wear, and the service life of an assembly formed by the piston 3 and the first sealing element 14 is prolonged.

Optionally, as shown in fig. 3, a first one-way valve 210 is disposed at the second water outlet 21, where the first one-way valve 210 is used to limit the liquid in the fourth cylinder 8 to enter the first cavity 20; a second one-way valve 220 is arranged at the second water inlet 22, and the second one-way valve 220 is used for limiting the liquid in the first cavity 20 to enter the second pipeline 17; a third one-way valve 710 is arranged at the third water outlet 71, and the third one-way valve 710 is used for limiting the liquid in the fourth cylinder 8 to enter the second cavity 70; a fourth one-way valve 720 is provided at the third water inlet 72, the fourth one-way valve 720 being adapted to restrict liquid in the second chamber 70 from entering the second conduit 17.

The valve body 2200, which limits the flow direction of the medium, of the first check valve 210, the second check valve 220, the third check valve 710, and the fourth check valve 720 can limit the reverse flow of the medium.

When the piston 3 moves towards the first water outlet 13, the first one-way valve 210 is opened, the second one-way valve 220 is closed, the volume of the first cavity 20 is reduced, the internal air pressure is increased, the liquid in the first cavity 20 is pushed into the fourth cylinder 8 to perform water spraying operation, meanwhile, the third one-way valve 710 is closed, the fourth one-way valve 720 is opened, the volume of the second cavity 70 is increased, the internal air pressure is reduced, and the liquid in the second pipeline 17 is sucked into the second cavity 70 under the action of the pressure difference;

when the piston 3 moves away from the first water outlet 13, the first check valve 210 is closed, the second check valve 220 is opened, the volume of the first cavity 20 is increased, the internal air pressure is reduced, the liquid in the second pipeline 17 is sucked into the first cavity 20 under the action of the pressure difference, meanwhile, the third check valve 710 is opened, the fourth check valve 720 is closed, the volume of the second cavity 70 is reduced, the internal air pressure is increased, and the liquid in the second cavity 70 is pushed into the fourth cylinder 8 to perform water spraying operation.

Optionally, as shown in fig. 4, the second water inlet 22 includes a first hole section 221 and a second hole section 222, the second hole section 222 is opposite to the first hole section 221 and has a larger aperture than the first hole section 221, the second pipe 17 extends into the second hole section 222, and the second pipe 17 has an inner side with a smaller aperture than the second hole section 222, a first mesa 223 is formed between the inner wall of the first hole section 221 and the inner wall of the second hole section 222, and a second mesa 170 is formed between the inner wall of the second pipe 17 and the inner wall of the second hole section 222;

the second check valve 220 includes a valve body 2200 and a spring 2201, the outer peripheral surface of the valve body 2200 is in contact with the inner wall of the second hole section 222, the spring 2201 is respectively abutted against the first land 223 and the valve body 2200, and the valve body 2200 is pushed by the spring 2201 to be abutted against the second land 170.

The second land 170 is an end surface of the second pipe 17 extending into one end of the second bore section 222.

Any one or more of the first check valve 210, the third check valve 710, and the fourth check valve 720 may have the same structure as the second check valve 220.

The surface of the valve body 2200 facing the first cavity 20 can be provided with a blind hole, so that the weight of the valve body 2200 is reduced, the processing cost is saved, meanwhile, the liquid with the flow rate flowing from the second cavity 70 to the second water inlet 22 can firstly enter the blind hole, the valve body 2200 is pushed to squeeze the second table top 170, and the sealing effect between the valve body 2200 and the second table top 170 is improved.

When the air pressure in the first cavity 20 is normal or larger, the valve body 2200 is abutted against the second table top 170 under the pushing of the spring 2201 so as to limit the water flow in the first cavity 20 to enter the second pipeline 17 through the second water inlet 22; when the air pressure inside the first cavity 20 is smaller, the air pressure difference pushes the liquid in the second pipeline 17 to increase the pushing force on the valve body 2200, when the pushing force is larger than the elastic force of the spring 2201 applied to the valve body 2200, the valve body 2200 moves towards the spring 2201 under the action of the pushing force, so that the spring 2201 is extruded and contracted, a gap exists between the valve body 2200 and the second table top 170, and the liquid enters the second hole section 222 and the first hole section 221 through the gap and then is supplemented to the first cavity 20.

Alternatively, as shown in fig. 5 to 6, the outer circumferential surface of the valve body 2200 is provided with a first groove 22000, and a plurality of first grooves 22000 are distributed around the axial center of the valve body 2200; the first land 223 is further provided with a boss 224 extending from the first bore section 221 toward the second bore section 222, the boss 224 restricting the valve body 2200 from contacting the first land 223; the boss 224 is provided with a plurality of second grooves 2240 for the passage of liquid.

The dimension of the space between the bottom of the first groove 22000 and the axial center of the valve body 2200 is larger than the inner diameter of the second pipe 17 in the radial direction of the valve body 2200.

A second groove 2240 is disposed in boss 224 about the axis of second bore section 222.

When the valve body 2200 is urged toward the first cavity 20 by the liquid, the boss 224 can abut the valve body 2200 to avoid the valve body 2200 from contacting the first land 223, ensuring that the liquid can enter the first cavity 20 through the second bore section 222 via the first groove 22000 and the second groove 2240.

While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A water pump for a dental appliance, comprising:

a housing including a first water outlet;

a first cylinder;

the piston comprises a movable head and an extension rod, the movable head is positioned at the inner side of the first cylinder body, and the extension rod is positioned at one side of the movable head away from the first water outlet;

a second cylinder, the extension rod extending to an inside of the second cylinder;

the wear-resisting block is positioned at the inner side of the second cylinder body and is in sliding fit with the inner wall of the second cylinder body;

the driving assembly comprises a driving piece, an eccentric gear and a connecting rod, wherein the driving piece drives the eccentric gear to rotate, two ends of the connecting rod are respectively connected with the eccentric gear and the wear-resistant block in a rotating way, the driving piece drives the wear-resistant block to reciprocate along a first direction through the connecting rod, and the wear-resistant block pushes the piston to move along the first direction;

the space, which is positioned at one side of the movable head, which is close to the first water outlet, on the inner side of the first cylinder body is a first cavity, the first cavity is used for containing tooth-flushing liquid, the first cavity is communicated with the first water outlet, and the movable head moves to push the liquid in the first cavity to the first water outlet.

2. The water pump of claim 1, further comprising a first seal located between the movable head and an inner wall of the first cylinder.

3. The water pump of claim 1, further comprising a third cylinder located between the first cylinder and the second cylinder, the third cylinder communicating with the first cylinder, the third cylinder being sealingly connected to the first cylinder, the extension rod passing through the third cylinder into the second cylinder.

4. A water pump according to claim 3, wherein a second seal is provided between the extension rod, the third cylinder and the second cylinder.

5. The water pump of claim 3, further comprising a fourth cylinder disposed between the first cylinder and the first water outlet, the fourth cylinder in communication with the first cavity through a second water outlet.

6. The water pump of claim 5, wherein the movable head is away from the surface of the first water outlet, the inner wall of the first cylinder body, and the inner wall of the third cylinder body to form a second cavity, the third cylinder body is provided with a third water outlet communicated with the second cavity, the fourth cylinder body is provided with a first water inlet, the third water outlet is communicated with the first water inlet through a first pipeline, and the first cylinder body is provided with a second water inlet communicated with the first cavity.

7. The water pump of claim 6, further comprising a second conduit connected to a source of liquid for cleaning teeth, wherein the third cylinder is provided with a third water inlet in communication with the second cavity, wherein the third water inlet is in communication with the second conduit, and wherein the second water inlet is in communication with the second conduit.

8. The water pump of claim 7, wherein a first one-way valve is provided at the second water outlet, the first one-way valve being configured to restrict liquid in the fourth cylinder from entering the first cavity;

a second one-way valve is arranged at the second water inlet and is used for limiting liquid in the first cavity to enter the second pipeline;

a third one-way valve is arranged at the third water outlet and is used for limiting liquid in the fourth cylinder body to enter the second cavity;

the third water inlet is provided with a fourth one-way valve, and the fourth one-way valve is used for limiting liquid in the second cavity to enter the second pipeline.

9. The water pump of claim 8, wherein the second water inlet comprises a first hole section and a second hole section, the second hole section is opposite to the first hole section and has a larger aperture than the first hole section, the second pipe extends into the second hole section, the inner side of the second pipe has a smaller aperture than the second hole section, a first table top is formed between the inner wall of the first hole section and the inner wall of the second hole section, and a second table top is formed between the inner wall of the second pipe and the inner wall of the second hole section;

the second one-way valve comprises a valve body and a spring, the outer peripheral surface of the valve body is in contact with the inner wall of the second hole section, the spring is respectively abutted against the first table top and the valve body, and the valve body is pushed by the spring to be abutted against the second table top.

10. The tooth-rinsing water pump according to claim 9, wherein a first groove is formed in the outer peripheral surface of the valve body, and a plurality of the first grooves are distributed around the axis of the valve body;

the first table top is further provided with a boss extending from the first hole section towards the second hole section, and the boss limits the valve body to be in contact with the first table top;

the boss is provided with a plurality of second grooves for liquid to pass through.