CN202370790U

CN202370790U - Piston assembly of air pump

Info

Publication number: CN202370790U
Application number: CN2011205738875U
Authority: CN
Inventors: 李伟高
Original assignee: NINGBO WUMA INDUSTRY Co Ltd
Current assignee: NINGBO WUMA INDUSTRY Co Ltd
Priority date: 2011-12-23
Filing date: 2011-12-23
Publication date: 2012-08-08
Anticipated expiration: 2021-12-23

Abstract

The utility model discloses a piston assembly of an air pump, which comprises a piston and a piston ring. A piston ring groove for embedding the piston ring is arranged surround the piston, a piston ring assembly formed after the piston is installed on the piston ring runs in a cylinder body, the piston ring is adhered to the cylinder body wall in a sealing mode, a compression space defined by the piston and the cylinder body is airtight, the end surface of one compression side of the piston ring is provided with a circumferential groove, the middle of the surface of the circumferential side of the piston ring abutted against the cylinder body wall, the gradient of two sides of the piston ring reduces gradually, and a protruded point abuts against the cylinder body wall. When the piston runs upward to compress air, the piston ring is contacted with the cylinder body wall, the piston ring has outward elastic expansive trend under the action of the frictional force, the abutting-against pressure between the piston ring and the cylinder body wall is increased, and the sealed compression space is ensured. When the piston runs downward to suck the air, the abutting-against pressure between the piston ring and the cylinder body wall is decreased, and the frictional resistance is decreased. By means of improvement on the piston ring and the piston ring groove, the air-sucking stroke resistance of the piston is decreased, and the energy efficiency of the air pump is improved.

Description

A kind of piston assembly of air pump

Technical field

The utility model relates to a kind of air pump, particularly a kind of piston assembly of air pump.

Background technique

The piston assembly of the middle-size and small-size air pump employing of existing technology comprises piston and piston ring at present; Wherein the ring week of piston is provided with the annular groove of setting piston ring; Piston ring has rectangular section; The outer surface of the piston ring after the installation seals applying mutually with cylinder body, and the compression volume that Piston Compression end face and cylinder body is formed surround is airtight, and the resistance that piston ring is made compression that upper and lower motion forms, suction stroke with piston is mainly from the surface friction drag of piston ring and cylinder body; The shortcoming of this structure is: piston ring surface friction drag when upper and lower motion is consistent, and efficiency is lower.

The model utility content

The utility model is in order to overcome defective in the above-mentioned existing technology, through the improvement to piston ring, piston ring groove, realizes the reduction of piston suction stroke resistance, improves the efficiency of air pump.

The utility model provides a kind of piston assembly of air pump; Comprise piston, piston ring, the ring week of piston is provided with the piston ring groove of setting piston ring, and the piston-ring packing that constitutes behind the piston ring installation runs in the cylinder block; Piston ring seals applying mutually with cylinder wall; Make the compression volume of piston and formation that cylinder body surrounds airtight, wherein, the end face of compression one side of piston ring is provided with the ring groove in week; Outstanding in the middle of the surrounding place side surface of piston ring and cylinder wall butt, both sides are the gradient and reduce gradually, and projecting point and cylinder wall connect; During the piston stroking upward pressurized gas, piston ring contacts with cylinder wall, has the trend of outside elastic dilatation at function of friction lower piston ring, makes the butt pressure of piston ring and cylinder wall increase, and guarantees the sealing of compression volume; When descent of piston was air-breathing, the butt pressure of piston ring and cylinder wall reduced, and surface friction drag reduces.

Wherein, to compress the groove of the end face of a side be the U-shaped structure that opening is big, the bottom reduces gradually to piston ring.

Wherein, the projecting point in the middle of the surrounding place side surface that connects with cylinder wall of piston ring is wedge angle or arc-shaped transition.

Preferably; The width of piston ring groove is greater than the thickness of piston ring; Make piston ring can be vertically in piston ring groove, move down, it is suitable that piston ring was expanded when the dimension scale of the width of piston ring groove and piston thickness and piston were in compression, suction stroke transfer process, tendencies toward shrinkage is changed required stroke.

Compared with prior art, the utlity model has following beneficial effect:

Through improvement to piston ring, piston ring groove, realize the reduction of piston suction stroke resistance, improve the efficiency of air pump.

Description of drawings

Fig. 1 is the utility model air pump piston assembly sectional view during suction stroke in cylinder body;

Fig. 2 is the utility model air pump piston assembly sectional view during the pressurized gas stroke in cylinder body;

Fig. 3 is the partial enlarged drawing I of Fig. 1.

In conjunction with the accompanying drawing following reference character of mark above that:

The 1-cylinder body, 2-cylinder cap, 3-piston, 31-piston ring groove, 4-air-intake valve plate, 5-exhaust valve plate, 6-axle, 7-equilibrium block, 8-piston ring, 81-groove, 82-side surface

Embodiment

Below in conjunction with accompanying drawing, the embodiment of the utility model is described in detail, but the protection domain that is to be understood that the utility model does not receive the restriction of embodiment.

The piston assembly of a kind of air pump of the utility model is shown in Fig. 1-3; Comprise piston 3, piston ring 8; The ring week of piston 3 is provided with the piston ring groove 31 of setting piston ring, and the piston-ring packing that piston 3 ring installations 8 backs constitute runs in the cylinder block 1, and the top of cylinder body 1 is provided with cylinder cap 2; Be connected through pore between cylinder body 1 and the cylinder cap 2, the switching of pore receives exhaust valve plate 5 controls; Piston ring 8 seals applying mutually with cylinder wall, makes piston 3 and 1 compression volume that surrounds formation of cylinder body airtight; The end face of compression one example of piston ring 8 is provided with the ring groove 81 in week, and outstanding in the middle of the surrounding place side surface 82 of piston ring 8 and cylinder wall butt, both sides are the gradient and reduce gradually, and projecting point and cylinder wall connect; During the piston stroking upward pressurized gas, piston ring contacts with cylinder wall, has the trend of outside elastic dilatation at function of friction lower piston ring, makes the butt pressure of piston ring and cylinder wall increase, and guarantees the sealing of compression volume; When descent of piston was air-breathing, the butt pressure of piston ring and cylinder wall reduced, and surface friction drag reduces.

Further as shown in Figure 3, the groove that piston ring compresses the end face of a side is the U-shaped structure that opening is big, the bottom reduces gradually; Projecting point in the middle of the surrounding place side surface that connects with cylinder wall of piston ring is wedge angle or arc-shaped transition (not shown).

Further as shown in Figure 3; The width of piston ring groove 31 is greater than the thickness of piston ring 8; Make piston ring 8 can be vertically in piston ring groove 31, move down, it is suitable that piston ring was expanded when the dimension scale of the width of piston ring groove and piston thickness and piston were in compression, suction stroke transfer process, tendencies toward shrinkage is changed required stroke.

Compared with prior art, the utility model is realized the reduction of piston suction stroke resistance through the improvement to piston ring, piston ring groove, improves the efficiency of air pump.

More than a disclosed specific embodiment that is merely the utility model, still, the utility model is not limited thereto, any those skilled in the art can think variation all should fall into the protection domain of the utility model.

Claims

1. the piston assembly of an air pump; Comprise piston, piston ring, the ring week of piston is provided with the piston ring groove of setting piston ring, and the piston-ring packing that constitutes behind the piston ring installation runs in the cylinder block; Piston ring seals applying mutually with cylinder wall; Make the compression volume of piston and formation that cylinder body surrounds airtight, it is characterized in that, the end face of compression one side of piston ring is provided with the ring groove in week; Outstanding in the middle of the surrounding place side surface of piston ring and cylinder wall butt, both sides are the gradient and reduce gradually, and projecting point and cylinder wall connect.

2. the piston assembly of air pump according to claim 1 is characterized in that, the groove that described piston ring compresses the end face of a side is the U-shaped structure that opening is big, the bottom reduces gradually.

3. according to the piston assembly of the described arbitrary air pump of claim 1-2, it is characterized in that the projecting point in the middle of the surrounding place side surface that connects with cylinder wall of described piston ring is wedge angle or arc-shaped transition.

4. the piston assembly of air pump according to claim 3; It is characterized in that; The width of described piston ring groove is greater than the thickness of piston ring; Make piston ring can be vertically in piston ring groove, move down, it is suitable that piston ring was expanded when the dimension scale of the width of piston ring groove and piston thickness and piston were in compression, suction stroke transfer process, tendencies toward shrinkage is changed required stroke.