JP2721999B2 - Radial compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an arm connected to both ends of two arms by the operation of an eccentric part which rotates on a circular orbit of a predetermined radius with rotation of a drive shaft. The present invention relates to a radial compressor configured to reciprocate a set piston in each cylinder, and more particularly to an improvement technique for the eccentric portion and its peripheral portion.

[Conventional technology]

The structure of a conventional radial compressor of this type is known, for example, from Japanese Patent Application Laid-Open No. 62-139986. In the radial compressor disclosed in the publication, as shown in FIGS. 10 and 11, a first arm 1 and a second arm 2 are disposed so as to intersect at right angles, and First pistons 3a, 3b are connected to both ends, respectively, and second pistons 3c, 3d are connected to both ends of the second arm 2, respectively.
The pistons 3a and 3b and the second pistons 3c and 3d are
It is fitted into the first cylinders 4a, 4b and the second cylinders 4c, 4d arranged at 90 ° intervals so as to be able to slide back and forth. An intermediate portion between the first arm 1 and the second arm 2 has a first elongated portion extending in a direction orthogonal to each arm axis.
A guide hole 5 and a second guide hole 6 are formed, and an eccentric portion 8 that rotates on a circular orbit x having a predetermined radius with the rotation of the drive shaft 7 is inserted into the guide holes 5 and 6. ing. The eccentric portion 8 is eccentrically attached to the drive shaft 7 and penetrates the first guide hole 5 and the second guide hole 6, and is rotatably fitted to the pin 9 via a bearing 10. One roller 11 inserted only into the first guide hole 5 and the other roller 13 rotatably fitted to the pin 9 via a bearing 12 and inserted only into the second guide hole 6. It is composed of Therefore, when the drive shaft 7 rotates and the pin 9 rotates on a circular orbit x having a predetermined radius, the first roller 11 and the second roller 13 are moved from the first roller 1 and the second roller 13 through the first arm 1 and the second arm 2. A force is transmitted to the first pistons 3a, 3b and the second pistons 3c, 3d, and the pistons 3a... 3d reciprocally slide in the cylinders 4a. In this case, the upper side of the first guide hole 5,
Right and left guide surfaces 6 of lower guide surfaces 5a, 5b and second guide hole 6.
a, 6b are mounted with a thin high-hardness plate with which the peripheral surfaces of the one-side and other-side rollers 11, 13 abut, respectively, and the one-side roller 11 and the other-side roller 13 The second guide holes 5 and 6 rotate independently of each other.

The radial compressor is a two-stage air compressor, in which the first cylinders 4a and 4b are set to a low pressure stage and the second cylinders 4c and 4d are set to a high pressure stage.
Of the second cylinder 4d into the suction chamber 15 of the second cylinder 4d.
And a discharge chamber 17 of the other first cylinder 4b is connected to a suction chamber 18 of the other second cylinder 4c via a passage 19, and intercoolers 20, 21 are provided in the middle of both the passages 16, 19, respectively.
Is installed. In the figure, reference numerals 20 and 21 denote suction chambers of the first cylinders 4a and 4b, and reference numerals 22 and 23 denote discharge chambers of the second cylinders 4c and 4d.

[Problems to be solved by the invention]

By the way, considering the relationship between the first guide hole 5 and the one-side roller 11 in the conventional radial compressor,
In FIG. 12, the states indicated by reference numerals (a) to (g) are obtained. When the crank angle indicated by reference numeral (a) is 0 °, that is, one of the first pistons 3a reaches the top dead center. When you do
While the residual pressure acting on the upper surface of the first piston 3a and the inertial force of the first piston 3a substantially cancel each other, and hardly affect the upper guide surface 5a of the first guide hole 5, the other Due to the inertial force of the first piston 3b, the lower guide surface 5b of the first guide hole 5 is deformed to be upwardly convex as shown by a chain line. Accordingly, the roller 11 is sandwiched between the two guide surfaces 5a and 5b of the first guide hole 5 and becomes unrotatable. Under such a state, immediately after this, the roller 11 starts rotating at the maximum speed. 1 To move in the guide hole 5 in the lateral direction, the two guide surfaces 5a, 5
Wear occurs on b, and further causes seizure, causing problems such as generation of metal powder and noise. And the metal powder is a roller
It penetrates between 11 and both guide surfaces 5a, 5b to produce a so-called wedge effect, which promotes early wear. Further, although not shown, when the roller 11 moves slightly in the lateral direction from the state where the crank angle is 0 ° and the above-described inertial force becomes substantially zero, the roller 11 acts on the upper surface of the first piston 3a. Due to the remaining pressure, the upper guide surface 5a of the first guide hole 5 is deformed to be convex downward, and in this case also, the roller 11 cannot rotate. Such a problem occurs when the crank angle is 180 °, that is, when one of the first pistons 3a reaches the bottom dead center (the other first piston 3b reaches the This can occur in the same manner and immediately after that. In the state shown by the reference numeral (d), the upper guide surface 5a of the first guide hole 5 is deformed to be convex downward.

Next, when the crank angle reaches α ° and the other first piston 3b starts the compression stroke, as shown by the symbol (b), the roller which has been in contact with the upper guide surface 5a of the first guide hole 5
11 will once come off and come into contact with the lower guide surface 5b with a large impact force, and a dent will be generated on the lower guide surface 5b by this impact force. It causes problems such as noise generation. In addition, code (e)
When the crank angle reaches .beta..degree. Between 180.degree. And 270.degree. As shown by, a depression occurs due to a large impact force on the upper guide surface 5a, causing the same problem as described above.

In addition, the above-mentioned problem can also occur in the relationship between the second guide hole 6 and the other roller 13.

In view of such a point, the present invention prevents a roller from being sandwiched between one guide surface and the other guide surface of the guide hole to be unable to rotate, and allows the roller to move from one guide surface to the other. The technical problem is to prevent a situation in which the guide surface comes into contact with a large impact force, thereby protecting the guide surface and eliminating the generation of metal powder and noise.

[Means for solving the problem]

The first means for achieving the above technical object is to connect a piston fitted into a cylinder to both ends of two arms arranged orthogonally to each other and to connect the two arms. A guide hole is formed in each intermediate portion of the book arm, and an eccentric portion that rotates on a circular orbit of a predetermined radius with the rotation of the drive shaft is provided with a roller inserted into the guide hole of one arm. A radial compressor comprising a roller inserted into a guide hole of the other arm and a pin eccentrically mounted on a drive shaft by rotatably fitting the two rollers to the outside. Each is separated into a first roller and a second roller that can rotate independently around the pin, and the peripheral surface of the first roller contacts only one of the guide surfaces of the guide hole and is separated from the other guide surface. And a peripheral surface of the second roller. Grooves are formed on opposite sides of each of the one guide surface and the other guide surface so as to contact only the other guide surface and form a predetermined gap between the one guide surface. It has been provided.

The second means is to connect a piston inserted in a cylinder to both ends of each of two arms arranged orthogonally to each other, and to connect an intermediate portion between each of the two arms. A radial compressor in which a guide hole is formed in a portion and an eccentric portion that rotates on a circular orbit of a predetermined radius with the rotation of the drive shaft is inserted into the guide hole. A mounting member that is eccentrically held and penetrates the respective guide holes of the two arms, and an endless track type mounted on one side and the other side of a position corresponding to the respective guide holes in the mounting member. And a plurality of rollers of one roller type bearing are rolled with respect to one guide surface of the guide hole, and a plurality of rollers of the other roller type bearing are connected to the other of the guide holes. Plan Lies in the structure so as to roll to the plane.

[Action]

According to the first means, each roller inserted into each guide hole is separated into a first roller and a second roller which can rotate independently, and the first roller is provided on one guide surface of the guide hole. The second roller rotates while contacting only the other guide surface. In this case, the force acting on the first roller from one guide surface and the force acting on the second roller from the other guide surface are both received by the pins. The rollers are sandwiched between the guide surfaces via the pins, but each roller is held rotatable around the pins by the presence of each groove. Therefore, the two rollers are always in contact with the same guide surface, and a situation in which the contacting guide surface is shifted from one to the other does not occur. In addition, it is impossible that both rollers cannot be rotated.

Further, according to the second means, the endless track type roller type bearings are mounted on one side and the other side of the mounting member eccentrically held on the drive shaft, respectively. And between the roller-type bearing on the other side and the other guide surface,
Even if no gap is provided, the plurality of rollers of each roller-type bearing are held in a rollable state in contact with both guide surfaces. This is due to the adoption of a roller-type bearing having a structure in which a plurality of rollers move while rotating along a predetermined orbit (elliptical orbit). Therefore, also in this case, a situation does not occur in which the guide surface of the roller-type bearing, which comes into contact with the plurality of rollers, shifts from one to the other, and the plurality of rollers may not be able to rotate. Absent.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the embodiment described below, since the overall configuration is the same as the conventional example shown in FIGS. 10 and 11, only the main parts which are the characteristic parts of the present invention are illustrated here. Components common to those in the conventional example are denoted by the same reference numerals, and description thereof is omitted. 1 to 3 show the first embodiment of the present invention.
The first embodiment differs greatly from the prior art in that one side roller inserted into the first guide hole 5 of the first arm 1 is connected to the first roller 11a. The other roller separated into two rollers 1b and inserted into the second guide hole 6 of the second arm 2 is also a first roller 13a and a second roller 13b.
And each roller 11a, 11b, 13a, 13b is held so as to be independently rotatable about a pin 9 via an individual bearing 10a, 10b, 12a, 12b. Guideway
Grooves 5x and 5y were formed on opposite sides of 5a and lower guide surface 5b, and grooves 6x and 6y were also formed on opposite sides of right guide surface 6a and left guide surface 6b of second guide hole 6. Point. Accordingly, the first roller 11a on one side contacts only the upper guide surface 5a of the first guide hole 5 and is separated from the lower guide surface 5b via a predetermined gap. 11b abuts only on the lower guide surface 5b and is separated from the upper guide surface 5a via a predetermined gap, and similarly, the first roller 13a on the other side.
Abuts only on the right guide surface 6a of the second guide hole 6, is separated from the left guide surface 6b via a predetermined gap, and the second roller 13b on the other side contacts only the left guide surface 6b. Right guideway 6
It is separated from a by a predetermined gap.

According to such a configuration, when the pin 9 rotates on a circular orbit having a predetermined radius in accordance with the rotation of the drive shaft 7, the first roller 11a on one side always comes into contact with the upper guide surface 5a. While rotating, it moves in the first guide hole 5 in the lateral direction, and the second roller 11b on one side always moves in the second guide hole 6 while rotating in contact with the lower guide surface 5b, Similarly, the first roller 13a on the other side always moves in the vertical direction in the second guide hole 6 while rotating in contact with the right guide surface 6a, and the second roller 13b on the other side always contacts the left guide surface 6b. It moves in the second guide hole 6 in the vertical direction while rotating while contacting. Therefore, not only does not occur a situation in which the contact surface of the roller shifts from one side to the other side with a large impact force as shown by reference numerals (b) and (e) in FIG. A situation in which the roller cannot rotate due to the action of inertia force or residual pressure does not occur.

FIGS. 4 to 8 show a second embodiment of the present invention. This second embodiment is largely different from the conventional example in that bearings 30 and 31 are provided on an auxiliary member 7a of a drive shaft 7. FIG. The upper roller-type bearing 33 and the lower roller-type bearing 34 are attached to a point where the mounting member 32 is held through the upper portion and a lower portion of the mounting member 32 at a position corresponding to the first guide hole 5. The right and left roller bearings 35 and 36 are attached to the right and left portions of the mounting member 32 corresponding to the second guide holes 6. In this case, as the roller type bearings 33 ... 36, as shown in FIGS. 7 and 8, a plurality of rollers 37 ... 37 move along an endless orbit (elliptical orbit) while rotating. Things are used. Then, as shown in FIG.
Upper roller type bearing 33 and lower roller type bearing
The plurality of rollers 37 ... 37 of the upper guide surface of the first guide hole 5
The roller 5a and the lower guide surface 5b can be rolled without interposing a gap, and as shown in FIG. 6, a plurality of rollers 37... 37 of a right roller bearing 35 and a left roller bearing 36 are provided. Also, the second guide hole 6 can be rolled without interposing a gap between the right guide surface 6a and the left guide surface 6b. Therefore, according to the second embodiment, when the mounting member 32 rotates on a circular orbit having a predetermined radius with the rotation of the drive shaft 7, each roller-type bearing 33.
Move in the first guide hole 5 and the second guide hole 6 in the horizontal direction and the vertical direction.
… 37 does not separate from each guide surface 5a, 5b, 6a, 6b,
Also, the plurality of rollers 37... 37 do not become unrotatable.

FIG. 9 shows a third embodiment of the present invention.
This embodiment is different from the second embodiment in that the mounting member 32 is
Bearing on pin 38 mounted eccentrically on drive shaft 7
It is externally fitted via a pin 39, and the other configuration is the same as that of the second embodiment. Therefore, according to the third embodiment, the same operation as that of the second embodiment is performed.

In the above embodiment, the present invention is applied to a two-stage air compressor, but it goes without saying that the present invention can be similarly applied to other radial compressors such as a one-stage air compressor. .

[Effects of the Invention] The present invention is configured as described above, and has the following effects.

According to the radial compressor described in claim (1), each roller inserted into each guide hole of the first arm and the second arm is separated into a first roller and a second roller, and these two rollers are separated. The first roller abuts on only one of the guide surfaces and rotates so that the first roller can rotate independently of each other, and a groove is formed on the opposite side between one of the guide surfaces and the other of the guide holes. Since the rollers are configured to rotate while contacting only the other guide surface, both rollers are always kept in contact with the same guide surface. A transition from the guide surface to the other guide surface can be avoided, and the occurrence of a depression on the guide surface can be reliably prevented. In addition, since both rollers are always kept in a rotatable state, it is possible to avoid a situation in which the rollers move in a state of being sandwiched between the two guide surfaces by the action of the residual pressure and the inertia of the piston as in the related art. Wear of the guide surface, generation of metal powder, generation of noise, and the like are effectively eliminated.

According to the radial compressor described in claim (2), the endless track type roller type bearings are respectively attached to one side and the other side of the mounting member eccentrically held on the drive shaft, and the plurality of the one side roller type bearings are provided. Roller is rolled with respect to one guide surface of the guide hole, and a plurality of rollers of the roller type bearing on the other side are rolled with respect to the other guide surface. A state in which the guide surface with which the roller abuts from one side to the other as in the related art is avoided, and a situation in which a plurality of rollers become unrotatable is avoided. , The generation of metal powder, the generation of noise, and the like are reliably prevented.

[Brief description of the drawings]

FIGS. 1 to 3 show a first embodiment of the present invention.
1 is a longitudinal sectional side view showing a main part of a radial compressor according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG.
FIG. 3 is a sectional view taken along the line in FIG. III-III. FIGS. 4 to 8 show a second embodiment of the present invention. FIG. 4 is a longitudinal sectional side view showing a main part of a radial compressor according to the present invention, and FIG.
6 is a sectional view taken along the line VI-VI of FIG. 4, FIG. 7 is a perspective view of the roller type bearing alone, and FIG. 8 is a partially broken front view of the roller type bearing. FIG. 9 shows a third embodiment of the present invention and is a longitudinal sectional front view of an essential part. FIG. 10 is a longitudinal sectional front view showing the entire structure of a conventional radial compressor, FIG. 11 is a sectional view taken along the line II of FIG. 10, and FIG. FIG. 1,2… Arm 5,6… Guide hole 5a, 6a… One guide surface 5b, 6b… The other guide surface 5x, 5y, 6x, 6y… Groove 7 …… Drive shaft 11a, 13a… … First roller 11b, 13b… Second roller 32 …… Mounting member 33,34,35,36 …… Roller type bearing 37 …… Roller of roller type bearing

Claims (2)

(57) [Claims] 1. A piston inserted into a cylinder is connected to both ends of two arms arranged to intersect at right angles, and a guide hole is formed at an intermediate portion of each of the two arms. And, the eccentric portion that rotates on a circular orbit of a predetermined radius with the rotation of the drive shaft, a roller inserted into the guide hole of one arm, and a roller inserted into the guide hole of the other arm And a pin rotatably fitted to the outer periphery of the roller and mounted eccentrically on the drive shaft, wherein the first and second rollers are capable of independently rotating around the pin. The guide roller is separated into a roller and a second roller, and a peripheral surface of the first roller contacts only one of the guide holes of the guide hole to form a predetermined gap with the other guide surface, and a peripheral surface of the second roller is formed. The surface comes into contact only with the other guide surface and the one plan A radial compressor, wherein grooves are provided on opposite sides of the one guide surface and the other guide surface so as to form a predetermined gap between the inner surface and the inner surface. 2. A piston inserted into a cylinder is connected to both ends of two arms disposed orthogonally to each other and a guide hole is formed at an intermediate portion between each of the two arms. And a radial compressor in which an eccentric portion that rotates on a circular orbit of a predetermined radius in accordance with the rotation of the drive shaft is inserted into the guide hole, wherein the eccentric portion is eccentrically held by the drive shaft. A mounting member penetrating through the respective guide holes of the two arms, and a track type roller type bearing mounted on one side and the other side of the mounting member at a position corresponding to the respective guide holes. At the same time, a plurality of rollers of one roller type bearing are rolled with respect to one guide surface of the guide hole, and a plurality of rollers of the other roller type bearing are rolled with respect to the other guide surface of the guide hole. Move A radial compressor characterized by having such a configuration.