WO2004038207A1

WO2004038207A1 - Gap-sealed piston ring, gap-sealed ring-reduction piston engine and ring-reduction reciprocating mechanism

Info

Publication number: WO2004038207A1
Application number: PCT/CN2003/000761
Authority: WO
Inventors: Dunhua Gao
Original assignee: Dunhua Gao
Priority date: 2002-10-22
Filing date: 2003-09-08
Publication date: 2004-05-06
Also published as: CN1216229C; AU2003261640A1; CN1492136A

Abstract

The present invention relates to a gap-sealed piston ring, a gap-sealed ring-reduction piston engine and a ring-reduction reciprocating mechanism, wherein, the gap-sealed ring-reduction piston engine and the ring-reduction reciprocating mechanism comprise at least one gap-sealed piston ring, said gap-sealed piston ring forms an axially parallel cut line extended along a long arc, said long arc forms a sharp angle α with respect to the outer circumference where α<10°. The inner and outer circumference of the slanted cut piston ring form an inner edge of a cut line extended along a long arc and an overlapping outer edge, said inner edge and outer edge are elastically overlapped with each other.

Description

Notch-sealed piston ring and notch-sealed reduced-ring piston engine and reduced-ring reciprocating machine Technical field

The invention relates to a notch sealing piston ring with good sealing performance and energy saving, a notch sealing piston reducing ring engine and a ring reducing reciprocating working machine. , Background technique

Piston rings are the most important seals in reciprocating piston engines. The gaps of existing piston ring cuts, such as right-angle cuts, oblique cuts, and stepped cuts, are not sealed, that is, a certain distance of working gap is retained. Leakage due to structural reasons, the gap further expands during wear, and the piston ring develops into the main air leakage channel which causes uphill and downhill gas leakage, energy leakage, local heating, and deterioration of conditions.

When the above-mentioned piston ring, such as an oil ring or an air ring, is used in a common engine, there are leaks in various notch gaps, so the sealing task cannot be completed alone. A common engine usually has three piston rings: two air rings and one oil ring. If the engine's three piston rings are reduced by one, the leak tightness will increase, the leakage will increase, and the engine efficiency will decrease.

In order to solve the above-mentioned problems, foreign countries have reduced the number of rings, developed a double-ring piston engine, and improved the oil ring sealing ability to prevent oil from flowing up: That is, from the three-component oil ring, increase the upper and lower oil scrapers of the lining ring to nearly double the cylinder wall. Pressure and oil consumption are controlled. Although the sealing performance is slightly improved, the friction power consumption is increased. In addition, in order to prevent the gas from leaking down, the industry achieved this by improving the machining accuracy and making the gap clearance of the gas ring as small as possible, but it was difficult to avoid a high pressure loss of 10-15% when the cylinder pressure dropped! Summary of the Invention

Based on the shortcomings of the prior art, one of the objectives of the present invention is to provide a cut-sealed piston ring with a closed seal and no air leakage.

Another object of the present invention is to provide a notch-sealed reduced-ring piston engine and a reduced-ring reciprocating working machine, which have good sealing performance and energy saving.

The invention is implemented as follows: According to the present invention, a notch-sealed piston ring is formed with a long-arc notch parallel to its axial direction. The long-arc notch 3 is cut along an outer peripheral long arc at an acute angle cc less than 10 degrees, and is formed by obliquely cutting the inner and outer periphery. Elastic laps with long arc cuts inside and lap outside. Among them, the inner edge of the long arc incision and the outer edge of the lap are affected by the air pressure of the ring backlash to strengthen the closed seal of the incision. The shape parameter of the long-arc cut varies with the acute angle α of the cut. Wherein, the average arc length between the start and end points of the long arc notch of the notched seal piston ring diagonally across the inner and outer circumferences of the piston ring is represented by the center angle Θ of the average middle diameter of the piston ring. In the present invention, the center angle Θ is based on The working parameters of the piston ring are preferably within the range of ct less than 10 ° and greater than 5 °, and Θ greater than 0.6 [。]. The expanded perimeter of the piston ring is increased by a length compared to the perimeter of the outer diameter, that is, Θ [弪] the inner side of the long arc cut multiplied by the ring diameter; when the outer diameter wear circumference is shortened, the cut slips by that length It can extend and compensate for the change of the perimeter, and keep the incision overlap elastically closed to adapt to the high-pressure gas seal.

The invention discloses a notch-sealed reduced-ring piston engine and a reduced-ring reciprocating working machine, which comprises at least one notch-sealed piston ring. The cut seal piston ring has a long arc cut parallel to its axial direction. The long arc cut is cut along the long circumferential arc of the piston ring at an acute angle e less than 10 degrees. The inner and outer circumferences of the piston ring are chamfered to form a length of elastic overlap. Arc cut inside and lap outside. Wherein, the average arc length of the long arc notch across the inner and outer periphery of the notched seal piston ring is represented by the center angle Θ of the average middle diameter of the notch seal piston ring, and the center angle Θ is based on the piston ring. The working parameters are preferably within the range of cc less than 10 ° and greater than 5 °. In the present invention, the notch-sealed double-ring piston engine and reciprocating machine further include at least one axial compression ring. The axial compression ring is ^ -shaped and wave-shaped, is placed under the notch-sealed piston ring, and is placed together in a piston oil ring groove. The axial compression ring can press the cut-out sealing piston ring up against the upper side of the oil ring groove of the piston, and always synchronizes with the piston spring. When the piston reciprocates up and down, the axial compression ring pressure supports the cut-out sealing piston. The ring does not sink, and it is always close to the upper side of the piston oil ring groove. Return to the cylinder along the path. The above process does not need to increase the abrasion pressure of the oil ring on the cylinder wall, and can complete the vertical sealing function without oil channeling. The axial compression ring is made of a spring ring sheet, and the pressure against the piston ring is greater than the downward combined force of the piston ring when the piston moves.

After adopting the present invention, it is not necessary to modify the engine and the reciprocating working machine, and only need to reduce one air ring, the ordinary three-ring engine and working machine can be improved to a cut-sealed double-ring piston engine and reciprocating work at any time. Machine. The ring reduction can increase the pressure of the cylinder, meanwhile, it can reduce wear, reduce frictional power consumption, durable and compact mechanism, reduce weight, reduce body, save processing energy at various levels, and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of a cylinder seal device of a notch-sealed double-ring piston engine and a reciprocating machine according to the present invention; FIG. 2 is a top view of the notch-sealed piston ring of the present invention;

FIG. 3 is a free state front view of the axial compression ring of the present invention. detailed description

The invention is further explained below with reference to the drawings.

Referring to FIG. 2, a notch-sealed piston ring 2 of the present invention is formed with a long arc notch 3 parallel to the axial direction of the piston ring 2. The long arc incision 3 of the piston ring 2 is cut along the outer arc of the piston ring 2 at an acute angle α, and the inner and outer circumferences of the beveled piston ring 2 form an elastically overlapped long arc notch inner edge 4 and an overlap outer edge 5. Among them, the inner edge 4 and the outer edge 5 of the long arc cut can be closed and sealed by the pressure of the annular backlash. The shape of the long arc cut 2 changes with the acute angle c of the cut. In the present invention, the acute angle a of the cut is less than 10 degrees.

In the present invention, the long arc notch 3 of the piston ring 2 diagonally spans the starting and ending points of the inner and outer circumferences of the piston ring 2 and the average arc length is represented by the center angle Θ of the average middle diameter of the piston ring 2. Etc., Θ is determined by the radial length of the piston ring 2 and the acute angle c of the cut. The smaller the ct, the larger the center angle Θ. If Θ is too small, the cut arc is short and the long arc cut 3 cannot be closed and difficult to seal. In the present invention, the center angle Θ is less than 10 according to the operating parameter of the piston ring 2. It is preferable to be larger than 5 °, and Θ is larger than 0.6 [弪].

The expanded perimeter of piston ring 2 is increased by a length compared to the perimeter of the outer diameter of the ring, that is, Θ [弪] the inner edge of the long-arc cut 4 multiplied by the ring's middle diameter; when the outer diameter wear perimeter is shortened, the cut slips by The length can be extended to compensate for the change in the perimeter, keeping the incision overlap elastically closed to adapt to the high pressure gas seal. .

1 and 3, a notch-sealed double-ring piston engine according to the present invention includes a cylinder seal device composed of a notch-sealed piston gas ring (not shown) and a notch-sealed piston oil ring 10. Said piston ring 2 can be used as a cut-sealing piston gas ring.

Referring to FIG. 1, a cut-sealed piston oil ring 10 is composed of a piston ring 2 and an axial compression ring 7. Of which axial pressure The shrink ring 7 is ring-shaped and wave-shaped. The notch seal oil ring 10 is placed in the piston oil ring groove 12, in the oil ring groove 12, the piston ring 2 is placed on the upper side, and the axial compression ring 7 is installed on the bottom side of the piston oil ring groove 12, which can be squeezed upward The piston ring 2 is in close contact with the upper side of the piston oil ring groove 12, and is always elastically combined with the piston 14 to synchronize. When the piston 14 reciprocates up and down, the pressure of the axial compression ring 7 supports the piston ring 2 without sinking, and it is always close to the piston oil. The upper side of the ring groove 12 prevents the oil from turning back into the oil return hole 16 from the lower part of the piston chamfer, or from the bottom side of the piston oil ring groove 12 to the ring back gap between the axial compression ring 7 and the return cylinder along the path 99. . The above process does not need to increase the abrasion pressure of the oil ring 10 on the cylinder wall 20, and can complete the independent sealing function of the engine oil without channeling.

Referring to FIG. 3, the axial compression ring 7 is made of a spring ring sheet, and the waveform is distributed along the circumference of the ring. The pressure against the piston ring 2 is greater than the downward combined force of the piston ring 2 when the piston 14 moves.

The present invention improves the independent sealing performance by changing the structure of the sealing piston gas ring and the sealing piston oil ring 10, that is, changing the structure of the cut of the notched sealing piston ring 2; at the same time, the invention also designed a sealing piston to prevent the oil from channeling upwards. The oil ring 10 and the engine piston 14 can be reduced, that is, the three-ring engine is reduced to a notch-sealed double-ring engine. In addition, the present invention does not need to modify the engine and the working machine, and only needs to reduce one air ring, so the ordinary three-ring engine and working machine can be improved to a notch-sealed double-ring piston engine and working machine at any time.

The comparative experimental results show that the notch-sealed double-ring engine and working machine have higher sealing performance and higher cylinder pressure than the ordinary three-ring engine and working machine. At the same time, it can reduce wear, reduce frictional power consumption, be durable and compact, and reduce machine weight and body. Save energy at all levels of processing and reduce costs.

From small gasoline engines to high-power heavy-duty marine diesel engines, reciprocating pistons, cylinders, air compressors, die-casting machines, vacuum pumps, shock absorbers and other reciprocating working machines, all related industries can improve the development of ring reduction and manufacture advanced reciprocating working machines and cutouts. Sealed minus ring piston engine.

The ring-reducing reciprocating working machine disclosed above is only a preferred embodiment of the present invention. Of course, the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the scope of patent application of the present invention are still covered by the present invention. Range.

Claims

Rights request

What is claimed is: 1. A reciprocating working machine with reduced ring, especially a notched sealed reduced ring piston engine, characterized by comprising at least one notched sealed piston ring.

2. The ring-reducing reciprocating working machine according to claim 1, wherein the notch-sealing piston-reducing piston engine has a long-arc notch parallel to its axial direction, and the long-arc notch Cut into the long circumferential arc of the piston ring at an acute angle α less than 10 degrees, and chamfer the inner and outer circumferences of the piston ring to form the inner edges and the outer edges of the long arc cut that are elastically overlapped.

3. The ring-reducing reciprocating working machine according to claim 2, especially a notch-sealing and reducing-ring piston engine, characterized in that: the long-arc notch of the notch-sealing piston ring slants across the inner and outer perimeters of the starting and ending points of the mean arc. The length is expressed by the center angle Θ of the average middle diameter of the notch-sealed piston ring. The center angle Θ is preferably within the range of α less than 10 ° and greater than 5 ° according to the operating parameters of the piston ring.

4. The ring-reducing reciprocating working machine according to claim 3, especially a notch-sealed ring-reducing piston engine, further comprising at least one axial compression ring.

The ring-reducing reciprocating working machine according to claim 4, especially a notch-sealed and reduced-ring piston engine, wherein the axial compression ring is annular and wave-shaped, and is disposed below the notch-sealed piston ring, and Placed together in the piston oil ring groove. ;

6. The ring-reducing reciprocating working machine according to claim 5, especially the notch-sealing and reducing-ring piston engine, wherein: the axial compression ring can press the notch-sealing piston ring upward against the upper side of the piston oil ring groove. It always synchronizes with the elasticity of the piston. When the piston reciprocates up and down, the axial compression ring pressure supports the notch to seal the piston ring without sinking, and it is always close to the upper side of the piston oil ring groove.

The ring-reducing reciprocating working machine according to claim 6, wherein the notch-sealing and reducing-ring piston engine is characterized in that: the axial compression ring waveform is distributed along the circumference of the ring, and abuts against the notch-sealing piston ring. The pressure is greater than the downward combined force of the notch seal piston ring when the piston moves.

8. A notch-sealed piston ring, characterized in that: a long arc cut is formed on the piston ring axially parallel to the piston ring, and the long arc cut of the piston ring is cut along the outer peripheral arc of the piston ring at an acute angle cc, Miter cut The inner and outer peripheries of the piston ring form the inner edge of the long arc cut and the outer edge of the overlap.

9. The notched sealing piston ring according to claim 7, wherein: the inner edge of the long-arc cutout and the overlapped outer side are strengthened by the pressure of the ring backlash to strengthen the closed seal of the cutout, and the shape of the long-arc cutout follows the cutout. The acute angle α varies, and the acute angle α of the cut is less than 10 degrees.

10. The notched sealed piston ring according to claim 8, characterized in that: the long arc notch of the piston ring diagonally spans the starting and ending points of the inner and outer circumferences of the piston ring, and the average arc length of the piston ring is opposite to the average diameter of the piston ring. The central angle Θ indicates that the Θ of different types of rings is different. Θ is determined by the radial length of the piston ring and the acute angle of the cut oc. The working parameters of the piston ring are preferably within the range of ct less than 10 ° and greater than 5 °.

11. The notch-sealed piston ring according to claim 9, wherein: the expanded circumference of the piston ring is increased by a length greater than the circumference of the outer diameter, that is, the length of the product of Θ [Θ] and the ring diameter. The inner edge of the arc cut; when the outer diameter wear and shorten the perimeter, the notch slips this length to extend and compensate for the change in the perimeter, keeping the cut overlap elastically closed to adapt to the high pressure gas seal.