JP2004125159A - Piston ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further increase the pressure of filling gas by stably and sufficiently preventing gas leakage in operation over a long period of time. <P>SOLUTION: Contact piston rings 3 and 4 with joints 3a and 4a are disposed in ring grooves 5 while avoiding the mutual matching of the joints 3a and 4a and overlapping with each other in a direction orthogonal to the radial direction, and a guide ring 6 is disposed in the ring groove 5 so as to be positioned on the inside of the piston rings 3 and 4. Projected parts 17 and 18 are provided on the piston rings 3 and 4 so that projected parts 17 and 18 positioned differently relative to the joints 3a and 4a so as to be projected inward. The piston rings 3 and 4 are disposed with the projected parts 17 and 18 fitted into the guide clearance 19 of the guide ring 6. Thus, the relative positional displacement between the piston rings 3 and 4 and between the piston rings 3 and 4 and the guide ring 6 can be prevented. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a piston ring applied to, for example, an engine, an expander, a compressor, and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a piston seal method having a gap has been adopted for a compressor of this type.
[0003]
However, this method is a so-called piston ring. However, since there is an abutment gap at one place on the circumference, gas leaks along the abutment gap, and high pressure filling cannot be performed due to this gas leak. Could be.
[0004]
Therefore, this system has been implemented with various measures mainly for minimizing gas leakage from the opening gap.
[0005]
FIG. 5 shows an improved conventional compressor 100. In the compressor 100, the piston 2 arranges a plurality of contact piston rings 3 and 4 having an abutment in the ring groove 5 so as to overlap with each other in a direction perpendicular to the radial direction while avoiding mutual engagement of the abutments. In addition, the guide ring 6 is arranged in the ring groove 5 so as to be inside the plurality of contact piston rings 3 and 4. In FIG. 5, reference numeral 7 denotes a cylinder, reference numeral 8 denotes a gas inlet, and reference numeral 9 denotes a gas outlet.
[0006]
At this time, if the contact piston rings 3 and 4 and the guide ring 6 are simply assembled, the piston rings 3 and 4 are displaced from each other during operation, and the mutual mismatch of the abutment cannot be maintained.
[0007]
For this reason, the compressor 100 is provided with a position regulating means for regulating the mutual displacement of the contact piston rings 3, 4.
[0008]
FIG. 6 shows a first position regulating means 10 comprising a pin 11 fixed to the contact piston ring 3 and a through hole 12 formed in the contact piston ring 4, and the pin 11 is inserted into the through hole 12. By doing so, the mutual displacement of the contact piston rings 3 and 4 can be regulated, whereby the mutual inconsistency of the abutments 3a and 4a of the contact piston rings 3 and 4 can be maintained even during operation.
[0009]
FIG. 7 shows the second position restricting means 13, which comprises an upright piece 14 fixed along the inner peripheral wall of the contact piston ring 3 and a concave portion 15 formed along the inner peripheral wall of the contact piston ring 4. Since the standing pieces 14 are fitted into the recesses 15, the mutual displacement of the contact piston rings 3, 4 can be restricted, and thereby the mutual mismatching of the abutments 3 a, 4 a of the contact piston rings 3, 4 can be prevented. , Can be maintained during operation.
[0010]
[Problems to be solved by the invention]
However, the first position restricting means 10 has a problem that the pin 11 easily comes out of the through hole 12 during operation, so that it is not possible to stably prevent gas leakage, and the removed pin damages the cylinder. ing.
[0011]
Further, since the second position regulating means 13 is provided with the upstanding piece 14 on the mating surface 3b of the contact piston ring 3 with the contact piston ring 4, it is difficult to process the mating surface 3b with high accuracy, and therefore, There is a problem that gas leakage from the surface 3b cannot be prevented.
[0012]
Further, since both the first and second position regulating means 10 and 13 cannot regulate the displacement of the guide ring 6 with respect to the guide ring 6, there is a problem that gas leakage from the guide gap 6a of the guide ring 6 cannot be prevented. Have.
[0013]
In any case, the conventional compressor 100 has a problem that the pressure of the filling gas cannot be further increased due to insufficient gas leakage prevention measures.
[0014]
Therefore, the present invention provides a piston ring that is easy to process and assemble, and that can sufficiently prevent gas leakage stably over a long period of operation, thereby achieving higher pressure of the filling gas. It is intended to be.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is to dispose a guide ring having a substantially C-shaped guide ring having a guide gap between both ends inside a ring groove of a piston. A piston ring with a mouth,
A protrusion fitted into the guide gap is formed so as to protrude from an inner surface of the piston ring.
[0016]
Therefore, according to the first aspect of the present invention, the relative displacement between the piston ring and the guide ring can be prevented by fitting the projection into the guide gap, and the engagement between the piston ring and the guide gap between the guide ring can be prevented. , Can be closed with a guide ring and a piston ring, respectively.
[0017]
The invention according to claim 2 is the piston ring according to claim 1,
The piston ring is constituted by a plurality of contact piston rings that are arranged in the same ring groove so as to overlap in a direction orthogonal to the radial direction,
The protrusion is provided on each contact piston ring so that the plurality of contact piston rings have a positional relationship different from each other with respect to an abutment.
[0018]
Therefore, according to the second aspect of the present invention, the relative positions of each of the plurality of contact piston rings and the guide ring can be maintained at the time of assembly even during operation. It is possible to maintain the state of mismatch between the two and the state of mismatch between the abutment of each contact piston ring and the guide gap of the guide ring.
[0019]
By maintaining these inconsistent states, the gas leak path through the abutment along the direction of movement of the piston can be blocked by the overlapping contacting piston rings and through the abutment along the radial direction of the cylinder. The gas leak path can be closed by a guide ring.
[0020]
The invention according to claim 3 is the piston ring according to claim 1,
The abutment is configured as a step cut type.
[0021]
For this reason, according to the third aspect of the invention, it is possible to maintain the mismatch between the step-cut type abutment of the piston ring and the guide gap of the guide ring. A piston ring having a step-cut type fitting can itself prevent gas leakage through a fitting along the moving direction of the piston, but by maintaining the mismatch state, a fitting along the radial direction of the cylinder can be prevented. The gas leakage path through the gasket can also be closed by the guide ring.
[0022]
According to a fourth aspect of the present invention, there is provided the piston ring according to the second aspect,
The plurality of contact piston rings are formed in the same shape so that the protrusion is formed at a portion other than the side opposite to the abutment, and one contact piston ring is used for another contact piston ring. Are arranged inside the ring groove by turning over and turning over.
[0023]
Therefore, in the invention of claim 4, the plurality of contact piston rings can be formed with the same design specifications. Therefore, when one contact piston ring is overturned and the other contact piston ring is overturned, the abutment of both becomes a line-symmetrical position based on the diameter passing through the protrusion, so that a plurality of contact piston rings By overlapping the piston rings while turning them over alternately, and fitting each protrusion into the guide gap of the guide ring, it is possible to maintain a mismatched state between the abutments.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIGS. 1A and 1B show a compressor 1 to which a piston ring according to an embodiment of the present invention is applied. The piston 2 of the compressor 1 has the abutment piston rings 3 and 4 arranged in the ring groove 5 and the guide ring 6 arranged in the ring groove 5 so as to be inside the piston rings 3 and 4. It is constituted by.
[0026]
In FIG. 1, reference numeral 7 denotes a cylinder, reference numeral 8 denotes a gas intake port, reference numeral 9 denotes a gas discharge port, reference numeral 14 denotes a piston pin, reference numeral 15 denotes a connecting rod connected to the piston pin, and reference numeral 16 denotes a rider ring. .
[0027]
As shown in FIG. 2, at this time, the piston rings 3, 4 are provided with projections 17, 18 protruding inward in the radial direction on the inner surfaces thereof. It is formed to have a substantially C-shape with a guide gap 19 between both ends. The piston rings 3, 4 are arranged outside the guide ring 6 with the projections 17, 18 fitted in the guide gaps 19.
[0028]
More specifically, the piston 2 is configured such that a plurality of contact piston rings 3 and 4 having parallel cut type abutments 3a and 4a are formed in a direction perpendicular to the radial direction while avoiding mutual agreement of the abutments 3a and 4a. And the guide ring 6 is arranged in the ring groove 5 so as to be inside the plurality of contact piston rings 3 and 4. The contact piston rings 3 and 4 are provided with projections 17 and 18 having positions different from each other with respect to the abutments 3a and 4a so as to protrude inward in the radial direction.
[0029]
In the present embodiment, two contact piston rings 3 and 4 are arranged in a single ring groove 5 in an overlapping manner, and five ring grooves 5 are formed in the entire piston 2. The contact piston ring 3 (4) is formed into a ring shape using, for example, polytetrafluoroethylene, and a part of the circumference thereof is cut vertically to form a parallel cut type abutment 3a (4a). Is formed. The contact piston rings 3, 4 have the same diameter, the same thickness, the same width, and the same size.
[0030]
The projections 17 and 18 are formed integrally with the main body at positions where the relative positions of the projections 17 and 18 are θ1 (eg, 225 °) and θ2 (eg, 135 °), respectively. In FIG. 2, reference symbol c is the ring center of each contact piston ring 3, 4.
[0031]
In addition, the guide ring 6 is formed by bending a strip having substantially the same width as the thickness when the two contact piston rings 3 and 4 are overlapped into a substantially C-shape. As the material at that time, for example, the same synthetic resin material as the contact piston ring 3 (4) is used. At this time, the ring groove 5 is formed so that the opening width is slightly larger than the thickness when the two contact piston rings 3 and 4 are overlapped or / and the width of the guide ring 6 (see FIG. 1). FIG. 1 (b).
[0032]
The two contact piston rings 3 and 4 are arranged in the ring groove 5 with the respective projections 17 and 18 fitted into the guide gaps 19 of the guide ring 6 (see the guide ring 6 in FIG. 2). . At this time, the outer peripheral wall of the guide ring 6 is in close contact with the inner peripheral walls of the two contact piston rings 3 and 4 (see FIG. 1B).
[0033]
In the compressor 1 configured as described above, the relative positions of each of the two contact piston rings 3, 4 and the guide ring 6 can be maintained at the time of assembly.
[0034]
That is, the fitting of the projections 17 and 18 into the guide gap 19 can prevent the relative displacement of the piston rings 3 and 4 and the guide ring 6 and can also prevent the abutments 3a and 4a of the piston rings 3 and 4 from being fitted. The guide gap 19 of the guide ring 6 can be closed by the guide ring 6 and the piston rings 3, 4, respectively.
[0035]
In this case, even during the driving, the abutting portions 3a, 4a of the contact piston rings 3, 4 are in a disagreement state, and the abutting portions 3a, 4a of the contact piston rings 3, 4 and the guide gap 19 of the guide ring 6 are not. Disagreement can be maintained, respectively, so that communication between the joints 3a, 4a of the contact piston rings 3, 4 or / and communication between the joints 3a, 4a and the guide gap 19 of the guide ring 6 can be maintained. As a result, gas leakage can be prevented.
[0036]
Specifically, by maintaining these mismatched states, the gas leakage path through the abutment 3a (4a) along the moving direction of the piston 2 can be closed by the mutually contacting piston rings 4 (3) that are superimposed. At the same time, the gas leak path via the joint 3a (4a) along the radial direction of the cylinder 7 can be closed by the guide ring 6.
[0037]
Further, since each of the projections 17 and 18 is provided so as to protrude inward along the radial direction of each of the contact piston rings 3 and 4, each contact 17 and 18 is not affected by the projections 17 and 18 at all. Since the mating surfaces of the piston rings 3 and 4 can be machined with high precision, gas leakage from the mating surfaces of the contact piston rings 3 and 4 can be effectively prevented, and the machining can be facilitated. Can be.
[0038]
Further, the contact piston rings 3, 4 can be assembled simply by fitting the projections 17, 18 into the guide gaps 19 of the guide ring 6, so that the assembly can be facilitated.
[0039]
Further, preferably, as in the present embodiment, the ring spring 20 having a width capable of being fitted into the ring groove 5 and having a substantially C-shape with both ends being free ends, is provided on the inner surface of the guide ring 6. And is disposed in the ring groove 5. In the present embodiment, the ring spring 20 is formed by bending a spring steel material having the same width as the guide ring 6 into a substantially C-shape, and has protrusions 17 and 18 between its free ends 20a (see FIG. 2). Is arranged inside the guide ring 6 in the ring groove 5 (see FIG. 1B).
[0040]
In this configuration, the guide ring 6 is urged toward the inner peripheral wall of the contact piston ring 3 (4) by the ring spring 20, whereby the protrusions 17 of each of the two contact piston rings 3, 4 are formed. , 18 with respect to the guide gap 19 can be made more reliable.
[0041]
For this reason, the mismatched state between the mating openings 3a, 4a of the contact piston rings 3, 4 and the mismatched state between the mating openings 3a, 4a of the contact piston rings 3, 4 and the guide gap 19 of the guide ring 6 are long-term. Can be stably maintained in spite of the operation, and the initial gas leakage prevention state can be maintained during a long operation period.
[0042]
More preferably, as shown in FIG. 3, the plurality of contact piston rings 3, 4 are formed in the same shape by forming the projection 17 at a portion other than the side opposite the abutment 3 a, The other contact piston ring 4 is placed inside the ring groove 5 by being overturned and overlapped with one contact piston ring 3.
[0043]
That is, as shown in FIG. 3, one contact piston ring 3 is formed such that the relative position between the projection 17 and the abutment 3a is an angle other than 180 ° (opposing position) (eg, θ3 = 210 °). ing. At this time, the other contact piston ring 4 is formed so that the relative position between the projection 18 and the abutment 4a becomes θ3 similarly to the one contact piston ring 3, and after turning over, the other contact piston ring 3 Can be stacked. After turning over the other contact piston ring 4, the relative position between the projection 18 and the mating opening 4 a becomes θ4 (for example, 150 °), and the relative position between the projecting portion 17 of one contact piston ring 3 and the mating opening 3 a is changed. Will be different.
[0044]
Thus, in this configuration, the plurality of contact piston rings 3, 4 can be formed with the same design specifications. For this reason, when the other contact piston ring 4 is turned upside down and overlapped with the one contact piston ring 3, the abutments 3a, 4a of both are line-symmetric with respect to the diameter D passing through the projection 17 (18). Position (see FIG. 3), the projections 17 and 18 of the contact piston rings 3 and 4 are fitted into the guide gaps 19 of the guide ring 6 to maintain the mismatched state of the abutments 3a and 4a. Can be.
[0045]
Therefore, the plurality of contact piston rings 3, 4 can be formed by using one type of mold, and can be assembled by fitting the respective projecting portions 17, 18 into the guide gaps 19. Cost reduction can be achieved, and processing and assembly are easy.
[0046]
FIG. 4 shows another piston ring 25. This piston ring 25 is the same as the piston ring 3 (4) except that it has an abutment 25a of a step cut type.
[0047]
That is, the piston ring 25 has a projection 26 having the same function as the projection 17 (18) of the piston ring 3 (4), and the projection 26 is fitted into the guide gap 19. It is arranged in the ring groove 5 (see FIG. 1) while being arranged outside the guide ring 6.
[0048]
After the piston ring 25 is mounted in the ring groove 5 similarly to the piston ring 3 (4), the piston ring 25 is prevented from being displaced relative to the guide ring 6 at the time of driving. The gap 25a is closed by the guide ring 6, and gas leakage from the gap can be effectively prevented. In addition, the piston ring 25 can, of course, have the same function and effect as the above-described piston ring 3 (4).
[0049]
That is, by fitting the projection 26 into the guide gap 19, the relative displacement between the piston ring 25 and the guide ring 6 can be prevented, and the mismatch between the abutment 25a and the guide gap 19 is maintained. can do. The piston ring 25 having the step-cut type abutment 25a itself can prevent gas leakage through the abutment 25a along the moving direction of the piston 2; The gas leak path through the joint 25a along the path can be closed by the guide ring 6.
[0050]
【The invention's effect】
As described above, according to the first aspect of the present invention, the mating surface of the piston ring can be accurately processed without being affected by the protrusion, and the protrusion is formed in the guide gap of the guide ring. Since the piston ring can be assembled simply by inserting it, it is easy to process and assemble, while preventing the relative displacement between the piston ring and the guide ring and driving the mismatch between the abutment and the guide gap. Therefore, sufficient gas leakage prevention can be stably obtained over a long period of operation, so that the pressure of the filling gas can be further increased.
[0051]
According to the second aspect of the present invention, the relative positions of each of the plurality of contact piston rings and the guide ring can be maintained at the time of assembly even during operation. Since the mismatched state between the ports and the mismatched state between the abutment of each contact piston ring and the guide gap of the guide ring can be maintained, it is possible to increase the pressure of the filling gas in addition to the effect of the invention of claim 1. It can be achieved more reliably.
[0052]
According to the third aspect of the present invention, since the abutment is formed as a step-cut type, gas leakage through the abutment along the moving direction of the piston itself can be prevented. By preventing relative displacement with the guide ring, a gas leak path through an abutment along the radial direction of the cylinder can be blocked by the guide ring. Higher pressure of the gas can be achieved more reliably.
[0053]
According to the fourth aspect of the present invention, the plurality of contact piston rings can be formed using one type of mold, so that the processing is easy in addition to the effect of the second aspect of the invention. At the same time, it is possible to achieve a reduction in die cost.
[Brief description of the drawings]
FIGS. 1A and 1B show a main part of a compressor to which a contact piston ring as one embodiment of the present invention is applied, wherein FIG. 1A is a schematic sectional view, and FIG. 1B is an enlarged sectional view of a portion A of FIG.
FIG. 2 is an exploded perspective view of a member arranged in a ring groove of the contact compressor of FIG.
FIG. 3 is a plan view of an assembly of a plurality of contact piston rings and guide rings applied to the compressor of FIG. 1;
FIG. 4 is an exploded perspective view of a piston ring and a guide ring as another embodiment arranged in a ring groove of the compressor of FIG. 1;
FIG. 5 is a schematic sectional view of a main part of a conventional compressor.
6 is an exploded perspective view of a contact piston ring and a guide ring arranged in a ring groove of the compressor of FIG.
FIG. 7 is an exploded perspective view of another guide piston ring and a guide ring arranged in a ring groove of the compressor of FIG. 5;
[Explanation of symbols]
1 Compressor 2 Piston 3 Piston ring (one contact piston ring)
3a Abutment 4 Piston ring (other contact piston ring)
4a Abutment 5 Ring groove 6 Guide ring 7 Cylinder 17 Projection 18 Projection 19 Guide gap 25 Piston ring 25a Abutment (step-cut type engagement)

Claims (4)

A piston ring having an abutment arranged inside a ring groove of a piston with a guide ring formed to have a substantially C-shape having a guide gap between both ends inside,
A piston ring, wherein a projection fitted into the guide gap is formed so as to protrude from an inner surface of the piston ring. The piston ring according to claim 1,
The piston ring is constituted by a plurality of contact piston rings that are arranged in the same ring groove so as to overlap in a direction orthogonal to the radial direction,
The piston ring, wherein the protrusion is provided on each of the contact piston rings so that the plurality of contact piston rings have a positional relationship different from each other with respect to an abutment. The piston ring according to claim 1,
The said joint is a step-cut type, The piston ring characterized by the above-mentioned. The piston ring according to claim 2,
The plurality of contact piston rings are formed in the same shape so that the protrusion is formed at a portion other than the side opposite to the abutment, and one contact piston ring is used for another contact piston ring. A piston ring, which is disposed in the ring groove by turning over and turning over.

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