JPS63289273A - Wave plate type compressor - Google Patents

Abstract

PURPOSE:To prevent the early abrasion of a roller by forming a pair of relief grooves on the recessed surface region corresponding to the max. compression cycle region of the acting surface of a wave plate, in the constitution in which a roller is interposed between a wave plate on a rotary shaft and a both head piston. CONSTITUTION:A rotary shaft 4 for supporting wave plate 3 is supported onto a pair of cylinder blocks 1 and 2, and a plurality of cylinder bores 5 and 6 are formed at equal angle positions around the rotary shaft 4, and a both head piston P is inserted in slidable ways in reciprocation in each bore 5, 6. A groove 7 for the passing of the wave plate 3 is formed at the center part in the direction of the center axis line of each both head piston P, and rollers 8 and 9 are interposed between the both edge surface of the passing groove 7 and the wave plate 3. In such a compressor, a pair of relief grooves 3a, 3b and 3c, 3d for avoiding the contact between the both edge side peripheral surfaces of the rollers 8 and 9 and the acting surface are formed on the recessed surface region corresponding to the max. compression cycle on the acting surface of the wave plate.

Description

Detailed Description of the Invention Object of the Invention (Field of Industrial Application) The present invention provides a filter plate on a rotating shaft supported by a cylinder block, and a double-ended piston housed in the cylinder block so as to be able to reciprocate and slide. This invention relates to a structure for securing a roller and a wave plate in a compressor in which a roller is interposed between the roller and the wave plate.

(Prior art) In a compressor that reciprocates a double-ended piston in a cylinder bore by rotating a swash plate, the double-ended piston reciprocates only once per swash plate rotation, and the compression capacity per swash plate rotation is small. Increasing the size of the compressor as a whole is unavoidable.

A compressor to solve these problems was developed in Japanese Patent Application Laid-open No. 57-
It is disclosed in Japanese Utility Model Publication No. 110783 and Japanese Utility Model Application Publication No. 57-114184. In this compressor, a plate that waves along the circumferential direction is used instead of a swash plate, and rollers are interposed between the wave plate and both end surfaces of the wave plate passage groove of the double-headed piston. A line of intersection between a plane perpendicular to the rotational axis of the wave plate and the working surface of the wave plate is radially parallel to the wave plate, and the rotational axis of the roller is set in the direction of the intersection. As a result, the direction of action of the wave plate on the double-headed piston substantially matches the direction of movement of the double-headed piston, improving compression efficiency, and the wave shape allows the double-headed piston to reciprocate multiple times per revolution of the wave plate. possible. Furthermore, by employing rollers, the action of converting rotational motion into linear motion is smoother than in the shoe type. (Problem to be Solved by the Invention) However, since the double-headed piston in the cylinder bore is rotatable around its axis, the front and rear roller pair, which is fitted and held on both end surfaces of the wave plate passage groove of the double-headed piston, cannot be rotated. The outer end side tilts in the direction of rotation of the wave plate due to the difference in circumferential speed depending on the radial position of the wave plate.
The axis of rotation of the roller and the radial direction of the wave plate no longer match. This tilting is likely to occur in the maximum compression process area where the heaviest load is applied, and the above-mentioned torsional positional relationship between the wave plate and the front and rear roller pair is due to the high speed rotation of the wave plate and the front and rear roller pair. Despite the existence of the set clearance, the wave plate is pressed and clamped by the front and rear roller pair in the concave area of the wave plate working surface. That is, when the center portion of the roller on the convex area side corresponding to the maximum compression stroke area of the wave plate working surface is in pressure contact with the working convex surface, both ends of the roller on the concave area side of the wave plate working surface are compressed by the tilting of the front and rear roller pair. The peripheral edge is forcibly brought into contact with the working concave surface, and the front and rear roller pairs press and hold the wave plate rotating at high speed from both sides. Such pressure clamping action causes premature wear of the rollers and wave plates and abnormal noise.

Structure of the Invention (Means for Solving the Problems) Therefore, in the present invention, a concave surface area of the wave plate action surface corresponding to the maximum compression process region where tilting of the roller is likely to occur is provided with a circumferential surface on both end sides of the roller and the action. A pair of relief grooves were installed in parallel to avoid contact with the surface.

(Function) That is, even when the rotation axes of the front and rear roller pairs of the wave plate are tilted with respect to the radial direction of the wave plate in the concave area of the wave plate working surface, the central portion of the rollers is Only the circumferential surface can contact the working surface, and the circumferential surfaces at both ends of the roller do not come into contact with the working concave surface.

Therefore, in the maximum compression process area, the roller on the concave side of the wave plate working surface is not forcibly pressed against the wave plate, and pressing and clamping by the pair of rollers before and after the wave plate is avoided.

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

As shown in FIG. 1, a pair of cylinder blocks 1 and 2 that are tightened together support a rotary shaft 4 for supporting a wave plate 3, and a plurality of rotary shafts 4 are arranged at equal angular positions around the rotary shaft 4. A cylinder bore of 5.6 is formed,
A double-headed piston P is fitted into each cylinder bore 5°6 so as to be able to reciprocate and slide. A groove 7 for passing the wave plate 3 is formed in the center of each double-headed piston P in the central axis direction, and rollers 8 and 9 are interposed between both end surfaces of the passage groove 7 and the wave plate 3. There is.

Approximately half the circumferential surfaces of the rollers 8 and 9 are located in the accommodation recess 7 on the end surface of the passage groove 7.
The rotation axis of the roller 8.9 is set in the radial direction of the wave plate 3 in the state shown in FIG.

A front housing 10 and a rear housing 11 are fixedly connected to the outer ends of both cylinder blocks 1 and 2, and inside both housings 10 and 11 there is a suction tube that communicates with the wave plate chamber 12 and can communicate with the cylinder bores 5 and 6. A discharge chamber 10b that can communicate with the chambers 10a, lla and the cylinder bore 5.6.

11b is partitioned.

The front and rear surfaces S1 and S2 of the wave plate 3 are formed into two-cycle curved surfaces that alternately repeat unevenness in the circumferential direction, and the rotational action of the wave plate 3 causes the linear movement of the double-headed piston P via the rollers 8 and 9. is converted to Section 2.3
As shown in the figure, concave areas Sla and S of one working surface S1
The lowest points B1a and B1c of lc are arranged with a phase difference of 180°, and the apex T1 of convex areas Slb and Sld
b and Tld are set midway between the lowest points B1a and Blc. The line of intersection between the plane perpendicular to the rotational axis of the wave plate 3 and the working surfaces Sl and S2 coincides with the radial direction of the wave plate 3, so that the rollers 8 and 9 are
In the case of the solid line position in the figure, the roller 8.9 and the working surface 31
．． It is in line contact with S2.

In the concave areas Sla and Slc, a pair of relief grooves 3a and 3b extending in the circumferential direction are arranged in parallel on the center side and the peripheral side, and both relief grooves 43a centered on the rotation axis of the wave plate 3 are provided.
, 3b have the same angular range.

The lowest points B2a and B2c on the other working surface S2 side are working surface S
The vertices Tld and Tlb on the l side are back to back, and the vertices T2b and T2d on the action surface S2 side are the lowest point B on the action surface Sl side.
It is back to back with lc and Bla. That is, concave area S2
b and S2d are back to back with the convex areas 31d and Slb on the side of the working surface Sl, and the convex areas S2a and 32C are concave areas Sla.

It is back to back with SLC. A pair of escape grooves 3c and 3d similar to those described above are also provided in parallel in the concave areas S2b and S2d, respectively.

As the wave plate 3 rotates, each double-headed piston P moves linearly back and forth within the cylinder bores 5 and 6, reciprocating twice for each rotation of the wave plate 3. As shown in FIG. 2, when the rollers 9 are in the ideal position shown by the solid line, the clearance CL set between the front and rear roller pair 8.9 and the wave plate 3 allows the front and rear roller pair 8.9 to move relative to the wave plate 3. Simultaneous crimping is avoided.

As shown in FIG. 1, in the maximum compression stroke region on the cylinder bore 5 side where the volume in one cylinder bore 5 is minimum, the pressure contact force between the convex surface area Slb of one working surface S1 of the wave plate 3 and the roller 8 is large. Due to the cooperation of this pressure contact force and the difference in circumferential speed, the outer end side of the roller 8 tends to tilt in the direction of rotation of the wave plate 3 shown by the arrow in FIG. 2. As this tilting occurs, the double-headed piston P rotates around its axis, and the roller 9 on the concave area SZb side also tilts in the same direction as the roller 8, and as shown by the chain line in FIG. Inclined in the circumferential direction. However, due to the presence of the relief grooves 3c and 3d, the peripheral edges of both ends of the roller 9 do not come into contact with the working concave surface S2b of the wave plate 3, and only the central peripheral surface of the roller 9 can come into contact with the working concave surface S2b. Therefore, the amount of approach of the roller 9 to the working concave surface S2b due to the tilting of the front and rear roller pair 8, 9 is within the set clearance L between the front and rear roller pair 8°9 and the wave plate 3.
Therefore, the peripheral edges of both ends of the roller 9 on the side of the concave area S2b are not forcibly brought into contact with the surface of the wave plate reaching the working concave area. As a result, the pressing action of the wave plate 3 by the front and rear roller pair 8, 9 is avoided, and early wear and abnormal noise of the wave plate 3 and the rollers 8, 9 is suppressed.

Of course, the present invention is not limited to the above-mentioned embodiments. For example, the present invention may be applied to a compressor in which the curved surface cycle of the wave plate is 1 or 3 or more, or the angular range of the relief groove in the circumferential direction may be increased or decreased as appropriate. It is also possible to set.

Effects of the Invention As detailed above, the present invention provides a pair of relief grooves in the concave area corresponding to the maximum compression process area of the wave plate working surface to avoid contact between the circumferential surface at both ends of the roller and the working surface. are installed in parallel, the amount of roller approach to the working concave surface due to the tilting of the roller, which is likely to occur in the maximum compression process area, is suppressed within the clearance set between the front and rear roller pair and the wave plate, and the wave plate of the roller This has an excellent effect in that it is possible to avoid the pressing and clamping action of the wave plate by the front and rear roller pair, which leads to premature wear and abnormal noise due to digging into the surface.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention; FIG. 1 is a side sectional view, FIG. 2 is an enlarged sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a perspective view of a wave plate. Cylinder blocks 1, 2, wave plate 3, relief grooves 3a, 3b, 3c, 3d, rotating shaft 4, rollers 8, 91.
Double-ended piston P, working surface Sl, 32, concave area Sla,
Slc, S2b, S2d.

Claims (1)

[Claims] 1. In a wave plate compressor in which a roller is interposed between a wave plate on a rotating shaft supported by a cylinder block and a double-headed piston housed in the cylinder block so as to be able to reciprocate, A wave plate type compressor, in which a pair of relief grooves are arranged in parallel in a concave area corresponding to a maximum compression process area to avoid contact between the circumferential surfaces on both end sides of the roller and the working surface.