JPH0244069Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a rider ring for a reciprocating machine that is suitably used for smoothly sliding a piston within a cylinder, and particularly relates to a rider ring provided at both ends of the rider ring. Regarding the improvement of the abutment section.

[Prior art]

6 to 9 show an oil-free reciprocating compressor equipped with a rider ring according to the prior art.

In the figure, 1 is a cylinder, 2 is the cylinder 1
A cylinder head is attached to the top via a valve seat member 3, and the inside of the cylinder head 2 is divided into a suction side chamber A and a discharge side chamber B by a partition wall 2A.
The valve seat member 3 is provided with a suction port 3A that communicates the suction side chamber A with the inside of the cylinder 1, and a discharge port 3B that connects the inside of the cylinder 1 with the discharge side chamber B. 3A and the discharge port 3B are opened and closed by a suction valve 4 and a discharge valve 5, respectively.

A piston 6 is slidably inserted into the cylinder 1, and the piston 6 is connected via a piston pin 8 to the other end of a connecting rod 7 whose one end is connected to a crankshaft (not shown). The cylinder 1 is configured to reciprocate within the cylinder 1 by rotationally driving the cylinder 1 with a motor or the like. A compression chamber C is defined between the upper end surface of the piston 6 and the cylinder 1, and in the compression chamber C, according to the reciprocating movement of the piston 6, air flows from the suction side chamber A through the suction valve 4. The sucked gas (air, refrigerant, etc.) is compressed, and the compressed gas is discharged into the discharge side chamber B via the discharge valve 5. Further, on the outer periphery of the piston 6, a circumferential groove 6A for a piston ring located on the upper end side is provided.
and a wide circumferential groove 6B for a rider ring located below the circumferential groove 6A, and the groove width of the circumferential groove 6B is designed to be a dimension H.

A piston ring 9 is attached to the circumferential groove 6A, and the piston ring 9 prevents the gas in the compression chamber C from leaking from between the piston 6 and the cylinder 1. Furthermore, 10 is a rider ring attached to the circumferential groove 6B, and the rider ring 10 prevents the piston 6 from oscillating laterally in response to the lateral oscillating movement of the connecting rod 7 when the piston 6 slides inside the cylinder 1. This prevents the piston 6 from sliding smoothly within the cylinder 1. Here, the rider ring 10 is formed of an elongated plate material as shown in FIG. 7, and its width h is designed to be somewhat smaller than the width H of the circumferential groove 6B in consideration of thermal expansion. ing. At both ends of the rider ring 10, there are approximately triangular convex portions 10 that serve as abutment portions.
A, the rider ring 10 is provided with a concave portion 10B, and the rider ring 10 is curved into a cylindrical shape so that the convex portion 10A and the concave portion 10B abut against each other (see FIG. 9), and in this state, the circumferential groove 6B installed inside.

In the reciprocating compressor configured in this way, by reciprocating the piston 6 within the cylinder 1, gas is sucked into the compression chamber C from the suction side chamber A via the suction valve 4, and this gas is transferred to the compression chamber C. The compressed gas is compressed within the air, is discharged through a discharge valve 5 to a discharge side chamber B, and is stored in a tank or the like connected to the discharge side chamber B.

[Problem that the invention attempts to solve]

However, in the above-mentioned prior art, the thickness of the entire rider ring 10 is uniform even on the convex portion 10A and concave portion 10B side, which are the abutment portions, as shown in FIG. When the piston 6 is curved into a cylindrical shape and installed in the circumferential groove 6B of the piston 6 as shown in FIG.
It pops out in the radial direction.

For this reason, in the conventional technology, when the piston 6 is inserted into the cylinder 1, the convex portion 10A and the concave portion 10B side of the rider ring 10 are pushed toward the inner circumferential side of the cylinder 1, making it difficult to insert the piston 6. In addition, there is a drawback that the convex portion 10A and concave portion 10B side do not conform to the inner circumferential surface of the cylinder 1 during initial operation of the compressor, causing damage to the inner circumferential surface of the cylinder 1. In particular, as reciprocating machines such as compressors become larger, the width and wall thickness of the rider ring 10 and the like become larger, and the above-mentioned drawbacks become a major problem.

The present invention has been developed in view of the above-mentioned drawbacks of the prior art.The present invention has been developed by thinning the abutment portions on both ends so that the abutment portions are stretched against the inner circumferential surface of the cylinder and the piston is inserted into the cylinder. To provide a rider ring for a reciprocating machine that can prevent the cylinder from becoming difficult to operate and from damaging the inner circumferential surface of the cylinder.

[Means for solving problems]

A feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that a tapered surface is formed at the abutment part of the rider ring so that the wall thickness becomes gradually thinner toward the distal end.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5. In the embodiment, the same components as those of the prior art shown in FIG. 6 described above are given the same reference numerals, and their explanations will be omitted.

1 and 2 show a first embodiment of the present invention.

In the figure, reference numeral 11 indicates a rider ring installed in the circumferential groove 6B of the piston 6, and the rider ring 11 is formed of an elongated plate material similarly to the rider ring 10 described in the prior art. Ring body 1
1A, and a convex portion 11B and a concave portion 11C each formed in a substantially triangular shape to form an abutment portion located at both ends of the ring body 11A. However, the convex portion 11B of the rider ring 11,
On the concave portion 11C side, tapered surfaces 11D, 11E, and 11E are formed by chamfering the surface side that slides on the inner peripheral surface of the cylinder 1, and the convex portions 11B and 11E are formed by the tapered surfaces 11D and 11E. The wall thickness on the side of the recess 11C is gradually reduced toward the tip side.

The rider ring 11 according to this embodiment has the above-described configuration, and when installed in the circumferential groove 6B of the piston 6, the rider ring 11 shown in FIG.
Similarly to 0, the convex portion 11B and the concave portion 11C are curved into a cylindrical shape so as to butt against each other in the circumferential direction.

However, in this embodiment, the tapered surfaces 11D and 11 are provided on the convex portion 11B and concave portion 11C sides of the rider ring 11.
E is provided so that the wall thickness on the sides of the protrusion 11B and the recess 11C becomes gradually thinner, so when the rider ring 11 is mounted on the piston 6, the protrusion 11B and the recess 11C of the rider ring 11 This can prevent the side from protruding in the radial direction of the piston 6. Moreover, even if the convex portion 11B and the concave portion 11C side protrude, these are the tapered surfaces 11D,
11E, it can be pushed inward in the radial direction relatively easily.

Therefore, according to this embodiment, the rider ring 11
The convex portion 11B and the concave portion 11C, which are the abutment portions, are stretched against the inner peripheral surface of the cylinder 1, and the cylinder
In addition to preventing the piston 6 from becoming difficult to insert into the cylinder 1, it is also possible to eliminate problems such as damage to the inner circumferential surface of the cylinder 1. Furthermore, various effects can be achieved, such as improved performance during initial operation compared to conventional techniques.

In the first embodiment, the tapered surfaces 11D and 11E are formed on the front side of the convex portion 11B and the recessed portion 11C, but instead of this, the tapered surfaces 11D and 11E are formed on the back side. It's okay,
Even in this case, substantially the same effects can be obtained.

Next, FIGS. 3 and 4 show a second embodiment of the present invention, and the features of this embodiment include the rider ring 1.
Tapered surfaces 21D, 21D, 21E, 21 are provided on both sides of the convex portion 21B and the concave portion 21C, which serve as the abutment portions of 21.
E, . . . are provided, and the thickness of the convex portion 21B and concave portion 21C side is gradually reduced toward the tip side.

Here, the rider ring 21 has each tapered surface 21
Except for D and 21E, they are formed in the same manner as the rider ring 11 described in the first embodiment, and include an elongated ring body 21A and a substantially triangular convexity formed on both ends of the ring body 21A. It consists of a portion 21B and a recessed portion 21C.

Thus, in this embodiment configured in this manner, it is possible to obtain substantially the same effects as in the first embodiment, and to eliminate problems such as damage to the inner circumferential surface of the cylinder 1.

Next, FIG. 5 shows a third embodiment of the present invention,
The feature of this embodiment is that on the outer peripheral side of the piston 31,
This is because the two rider rings 32, 32 are attached to the lower position. Here, each rider ring 32 is the rider ring 11 described in each of the above embodiments,
It is formed similarly to 21. Also, 33,33
shows a piston ring attached to the upper outer peripheral side of the piston 31.

Thus, in this embodiment configured in this way, it is possible to obtain substantially the same effects as in each of the embodiments described above, but in particular, in this embodiment, the piston 3
1 is formed in a large size, and two rider rings 32 and two piston rings 33 are attached to the outer circumferential side of the piston 31, so it can be suitably used in large reciprocating compressors, etc. .

Although the above embodiments have been explained using a reciprocating compressor as an example, the present invention is not limited to a rider ring for a compressor, but can also be applied to a rider ring for various reciprocating machines such as a vacuum pump.

Furthermore, although the abutment portions of the rider rings 11, 21, and 32 have been described as being constituted by substantially triangular convex portions 11B, 21B, concave portions 11C, 21C, etc., the abutment portions may have a shape other than a substantially triangular shape. Of course, it may be formed into any shape.

[Effect of idea]

As detailed above, according to the present invention, the abutment part of the rider ring is formed with a tapered surface so that the wall thickness gradually becomes thinner toward the distal end, so that the abutment part of the rider ring butts against each other in the circumferential direction. By doing so, when the rider ring is attached to the outer circumferential side of the piston, each abutment part can be prevented from protruding in the radial direction of the piston and sticking to the inner circumferential surface of the cylinder. It not only facilitates the insertion work into the cylinder, but also eliminates problems such as damage to the inner circumferential surface of the cylinder, and improves performance during initial operation, among other effects.

[Brief explanation of drawings]

1 and 2 relate to a first embodiment of the present invention, in which FIG. 1 is a developed view of the rider ring, FIG. 2 is a sectional view in the direction of the arrow in FIG. 1, and FIGS. Figure 4 relates to the second embodiment, Figure 3 is a developed view of the rider ring, Figure 4 is a sectional view in the direction of the arrow in Figure 3, and Figure 5 relates to the third embodiment and shows the rider FIGS. 6 to 9 are a front view of a main part broken away showing a state in which rings and the like are attached to a piston, and FIG. 6 is a longitudinal cross-sectional view showing a reciprocating compressor, and FIG.
The figure is a developed view of the rider ring shown in Figure 6.
The figure is a cross-sectional view in the direction of the arrow in FIG. 7, and FIG. 9 is a perspective view showing the rider ring in FIG. 7 in a cylindrically curved state. 1... Cylinder, 6, 31... Piston, 6
A, 6B... Circumferential groove, 9, 33... Piston ring, 11, 21, 32... Rider ring, 11
A, 21A...Ring body, 11B, 21B...
Convex portion, 11C, 21C... Concave portion, 11D, 11
E, 21D, 21E...Tapered surface.

Claims (1)

[Scope of utility model registration request] In a rider ring for a reciprocating machine that is attached to the outer periphery of a piston that is slidably inserted into a cylinder and has abutments at both ends, the abutment has a wall that gradually becomes thinner toward the tip. A rider ring for a reciprocating machine characterized by having a tapered surface formed so as to have a tapered surface.