Water pick and water pump thereof

Abstract

The utility model relates to a water pick and a water pump thereof. The water pump comprises a pump body assembled on a support, a cylinder-barrel-shaped containing cavity is formed in the pump body, a piston and a connecting rod are arranged in the cylinder barrel, the water pump further comprises a sealing ring and a cover body, the sealing ring is in an E shape from the side view, a horn-mouth-shaped through hole is formed in the center of the sealing ring, the sealing ring is clamped to the end of the cylinder barrel through the cover body, the piston is sleeved with the through hole, and the piston is sleeved with the cover body. One end of the through hole is in interference fit with the piston, the other end of the through hole is in clearance fit with the piston, and a horn opening of the through hole faces the outside of the cylinder barrel. According to the water pump, sealing can be guaranteed in the working process, and meanwhile the working efficiency of the piston is hardly affected; and the assembly can be disassembled after assembly, so that the total cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a water pick, especially the water pump of water pick. BACKGROUND

[0002] The water pick is a device that cleans teeth, tooth gaps and gums by high-pressure water flow, the water pump is an important part that changes water flow from low pressure to high pressure, and the motor is the power source, under the holding of the motor, the water pump works to provide the water pick with continuous high-pressure water flow.

[0003] The water pump for water pick, including installing the pump body on the support, and being located in the piston and connecting rod of pump body inside, still including a sealing sleeve, at present, the water pump for water pick on the market, its sealing sleeve needs to be glued in the assembly process link, this increases the cost, and the assembled water pump will be not detachable, this is the deficiency of prior art. SUMMARY

[0004] The utility model wants to solve the technical problem to provide a kind of water pump for water pick, it can be disassembled after assembly, and assembly cost is reduced.

[0005] The technical scheme of the utility model is: a kind of water pump for water pick, including assembly on the support pump body, the pump body is equipped with cylinder cavity, the cylinder is equipped with piston and connecting rod, still including sealing ring and cover body, the sealing ring side view is E-shaped, with the through-hole of flared mouth in the center, the cover body is clamped in the end of the cylinder with the sealing ring, the through-hole is sleeved on the piston, and one end is formed with interference fit with the piston, and the other end is formed with clearance fit with the piston.

[0006] The flared opening of the through-hole is towards the outside of cylinder.

[0007] The end of the cylinder has inner step and outer step, and the convex strip between the inner step and the outer step is inserted into the recess of the E-shaped.

[0008] The cover body has inner step, and the sealing ring is located on the inner step as a whole.

[0009] The piston is made of plastic.

[0010] The material of the sealing ring is silica gel.

[0011] Another technical scheme of the utility model is: a water pick, including the water pump as described above.

[0012] The technical effect of the utility model is: when the connecting rod is driven by the power assembly, the piston does reciprocating motion in the cylinder, in this process, the sealing ring keeps static state, the close extrusion formed by the interference fit between the through hole inner wall and the piston outer wall realizes the sealing effect of water flow; and the interference fit occurs in very narrow area due to the horn-shaped through hole, which reduces the resistance of piston movement, ensures the sealing while almost does not affect the working efficiency of the piston; the fixing of the sealing ring is the effect that the pump body and the cover body are clamped on the support, avoids the process step of dispensing, makes the assembled sealing ring detachable, reduces the assembly cost and total product cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the explosion view of the water pump assembly of the utility model.

[0014] Figure 2 is Figure 1 the connection relationship diagram of important parts.

[0015] Figure 3 is Figure 2 the assembly view. DETAILED DESCRIPTION

[0016] The embodiments of the utility model will be described in detail in combination with the drawings.

[0017] Referring to Figures 1-3 , the water pump of the utility model takes the motor (also called electric machine) 20 as the power source, drives a pinion 30 through the motor 20, drives a gear wheel 40 through the pinion 30, pivots a connecting rod 50 at the eccentric position of the gear wheel 40, connects the connecting rod 50 with a piston 80, and can drive the piston 80 to do reciprocating motion in the pump body 90, the pump body 90 is installed on the support 10, and is connected with a water inlet joint 92 and a water outlet joint 91, the reciprocating motion of the piston 80 sucks water from the water inlet joint 92, and extrudes the water from the water outlet joint 91 after pressure is applied, thereby providing the oral irrigator with continuous high-pressure water flow.

[0018] The pump body 90 is internally provided with a cavity similar to a cylinder, the cavity is connected with the water inlet joint 92 and the water outlet joint 91, the cylinder is internally provided with a piston, the piston is a cylindrical body made of plastic, the cylindrical body moves in the cylinder, and the sealing between the piston and the cylinder needs to be carefully considered.

[0019] The existing design adopts an elastic sealing sleeve, one end of the sealing sleeve is fixedly bonded to the outer wall of the cylinder by using glue, and the other end is fixedly bonded to the outer wall of the connecting rod by using glue, thereby ensuring the sealing of water flow and not affecting the movement of the piston and the connecting rod. But this design needs to go through the process step of dispensing, which is time-consuming and laborious, and is not detachable.

[0020] The utility model discloses a E-shaped sealing ring 70 solves the above -mentioned problem, the sealing ring 70 side view presents E shape, the centre has a trumpet mouth shape through -hole, through the trumpet mouth shape through -hole sleeve on the outer wall of piston 80, still be equipped with a cover 60, cylinder end has inner step and outer step, the inner step between the outer step forms the convex strip, the convex strip inserts the recess of E shape of sealing ring.The end of cover also has inner step, and E-shaped sealing ring whole is located the inner step of this cover, and the pump body 90 with the inner step of cover 60 with cylinder cavity are installed on a support 10, and make sealing ring 70 urgent card between the end of cylinder and the end of back cover 60, make its connection can be fixed.

[0021] The cooperation of the through-hole on the sealing ring 70 and the outer wall of the piston 80 involves the general principle of hole and shaft cooperation. In the embodiment, since the through-hole is trumpet-shaped, the inner diameter of one end is small, and the inner diameter of the other end is slightly larger. In professional terms, one end is an interference fit, and the other end is a clearance fit. The interference fit ensures the required sealing.

[0022] The sealing ring 70 is stationary, while the piston 80 moves back and forth. If the trumpet mouth faces the inside of the cylinder, the high-pressure water flow seeps into the sealing ring 70 and acts on the interference fit, which may wash away the mating surface and lose the sealing effect, and cannot obtain reliable and continuous sealing. If the trumpet mouth faces the outside of the cylinder, when the piston moves inward, the high-pressure water flow is blocked by the interference fit, and has no chance to enter the through-hole of the sealing ring. When the piston moves outward, the interference fit has an increasingly tight extrusion effect, and the high-pressure water flow is still blocked by the interference fit, and has no chance to enter the through-hole of the sealing ring. Therefore, reliable and continuous sealing effect can be obtained.

[0023] At the same time, the trumpet-shaped through-hole makes the interference fit occur in a very narrow area, which reduces the resistance of the piston movement. While ensuring sealing, it almost does not affect the working efficiency of the piston.

[0024] In the assembly of the water pump of the utility model, the process step of dispensing is avoided, time and manpower are saved, assembly cost is reduced, and after assembly, it is integrated, but it is detachable, thereby the total cost is saved.

[0025] The above description is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiment based on the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A water pump for oral irrigator, comprising a pump body assembled on a support, a cylinder-shaped cavity is arranged in the pump body, a piston and a connecting rod are arranged in the cylinder, characterized in that: The sealing ring is E-shaped in side view, has a through hole with a flared opening in the center, and the cover clamps the sealing ring at the end of the cylinder barrel, and the through hole is sleeved on the piston, one end of the through hole is in interference fit with the piston, and the other end is in clearance fit with the piston.

2. The water pump for an oral irrigator of claim 1, characterized in that: The flared opening of the through hole faces the outside of the cylinder barrel.

3. The water pump for an oral irrigator of claim 2, characterized in that: The end of the cylinder barrel has an inner step and an outer step, and a convex strip between the inner step and the outer step is inserted into a recess of the E-shaped sealing ring.

4. The water pump for an oral irrigator of claim 3, characterized by: The cover has an inner step, and the E-shaped sealing ring is located on the inner step as a whole.

5. The water pump for an oral irrigator according to any one of claims 1 to 4, characterized in that: The piston is made of plastic.

6. The water pump for an oral irrigator of claim 5, characterized by: The sealing ring is made of silica gel.

7. An oral irrigator characterized by: The water pump comprises the water pump as claimed in any one of claims 1 to 6.

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