JPH10274155A - Multistage compression device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multistage compression device to suppress the occurrence of running out of grease on the slide surfaces of a rolling bearing and a cross slider, the generation of noise, and the occurrence of discoloration and wear. SOLUTION: A multistage compression device is formed such that one pair or more of opposite pistons are provided, a rolling bearing 5 located between a yoke 1, at which the piston is fixed, and cross slider 2, the cross slider 2 is pressed through the rebound force of a spring mechanism 7 through a liner plate 6, and reciprocating movement of the piston is convertible from rotation movement of a crank shaft by a Scotch yoke mechanism. The multistage compression device forms a linear grease groove 20 having one or more recessed grease pockets 21 formed in the cross slider 2 making contact with the rolling bearing 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multistage compression apparatus for compressing a required gas such as natural gas to a high pressure in multiple stages. More specifically, the present invention relates to a grease running on a sliding surface between a rolling bearing and a liner plate. Further, the present invention relates to a highly reliable multi-stage compression device that suppresses noise, discoloration, wear, and the like.

As this type of multistage compression apparatus, as the number of compression stages increases, the diameter of the reciprocating compression section, that is, the compression section formed by the cylinder and the piston, becomes smaller as the pressure becomes higher.・ W-type, semi-star-type, star-type, counter-balance type, etc., and multi-step by connecting and interlocking with the crankshaft so that each compression part operates in the stroke shifted to the required phase The mechanism that operates the mechanism that performs the compression operation by a drive source such as an electric motor is described in the 1st Handbook of Mechanical Engineering, September 15, 1970, Japan Society of Mechanical Engineers.
It is disclosed by volume 0, FIG. 30 to FIG.

Conventionally, as shown in FIG. 5, four reciprocating compression units 101, 102, 103, 104
A multi-stage compressor in which the reciprocating compression unit 104 is arranged so as to reciprocate and interlock with the reciprocating compression unit 101 and the pressure is sequentially increased from the reciprocating compression unit 101 to make the reciprocating compression unit 104 the final high-pressure compression unit is disclosed in, for example, US Pat. No. 5,033,940. It is well-known in Japanese Patent Application Publication No.

In the above multistage compression apparatus, 1
A pair of opposed pistons 51 and 53 are connected to a yoke 1A, and a cross slider 2A movably provided across the axis 106 in the yoke 1A is connected to a crankshaft 4 via a crankpin 3. The other pair of opposing pistons 52 and 54 are oriented 90 degrees with the yoke 1A.
A cross slider (not shown) which is connected to the yoke 1B which is arranged at a staggered position and which is movable so as to cross the shaft 105 in the yoke 1B is also connected to the crankshaft 4 via the crankpin 3.

When the crankshaft 4 is rotated by an electric motor (not shown) to rotate the crankpin 3 around the crankshaft 4, the yoke 1A
, The displacement of the crankpin 3 in the direction of the shaft 105 corresponds to the movement of the cross slider 2A, and the movement of the yoke 1A in the direction of the shaft 106 corresponds to the pair of pistons 51 and 53. Reciprocate only in the direction of.

On the other hand, in the yoke 1B, a cross slider (not shown) moves in the direction of the axis 106 to correspond thereto.
Since the yoke 1B moves in the direction of the shaft 105, the pair of pistons 52 and 54 reciprocate only in the direction of the shaft 105.

In order to convert the constant revolving motion of the crankshaft 4 into the smooth reciprocating motion of the pistons 51, 52, 53 and 54, the cross slider 2 must slide smoothly within the yoke 1. There is. However, in the multistage compression apparatus having the above configuration, since the gas is adiabatically compressed, the temperature rises to 120 to 130 ° C. even when air-cooled by a cooling fan or the like, and the dimensions of the members change. Is formed from aluminum or an aluminum alloy or the like and a wear-prone cross slider is formed from steel or the like, there has been a problem that the gap between the yoke and the cross slider increases due to a difference in expansion coefficient during use.

The present inventors have previously described a multistage compression apparatus having a structure that is resistant to temperature changes without any problem that the cross slider and the yoke are significantly damaged even under such severe conditions. A multi-stage compression device is provided in which a rolling bearing is interposed between a cross slider and the rolling bearing, and the rolling bearing is pressed against the cross slider by the elastic force of a spring mechanism which receives the rolling bearing via a liner plate (Japanese Patent Application No. Hei 7-23789). Specification).

[0009]

However, in the above-mentioned multi-stage compression apparatus, noise, discoloration, abrasion, etc. in a long-term operation due to insufficient supply of grease to a surface on which the rolling bearing and the cross slider contact and slide. Cannot be suppressed, and there is still room for improvement in improving reliability.

An object of the present invention is to provide a multistage compression apparatus for compressing a required gas such as natural gas to a high pressure in multiple stages, and to supply a sufficient amount of grease to a surface on which a rolling bearing and a cross slider contact and slide. Another object of the present invention is to provide a highly reliable multi-stage compression device that suppresses noise, discoloration, wear, and the like.

[0011]

The present invention has been made as a result of intensive studies to solve the above-mentioned problems in the prior art. The present invention has been found to be able to suppress noise, discoloration, abrasion, and the like in long-term operation because the cut can be eliminated, and have accomplished the present invention.

According to the first aspect of the present invention, at least one
A pair of opposed pistons is provided, and the rolling bearing interposed between the yoke that fixes the piston and the cross slider is pressed against the cross slider by the elastic force of the spring mechanism via the liner plate, and the piston reciprocates. Is a multi-stage compression device that can be converted from the rotational movement of the crankshaft by the Scotch yoke mechanism,
A multistage compression apparatus characterized in that at least one linear grease groove having one or more concave grease pockets is provided on a cross slider surface in contact with a rolling bearing substantially in parallel with a longitudinal direction of the rolling bearing.

According to a second aspect of the present invention, in the multistage compression apparatus according to the first aspect, the concave grease pocket is a concave grease pocket having a semilunar and / or cylindrical shape.

According to a third aspect of the present invention, in the multistage compression apparatus according to the first or second aspect, the width of the linear grease groove is 1/5 to 1/1 of the width of the rolling bearing.
It is characterized by being 0.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. FIG. 1 is an explanatory view showing a main part of an embodiment of the multi-stage compression apparatus of the present invention. FIG. 2 is an exploded explanatory view of the multi-stage compression apparatus of the present invention shown in FIG. FIG. 1A is a perspective view showing a main part of an embodiment of a cross slider used in the present invention, and FIG.
FIG. 4 is a perspective view showing a main part of another embodiment of the cross slider used in the present invention, and FIG.
It is sectional explanatory drawing which shows the positional relationship of a rolling bearing and a liner plate. In these figures, FIG.
The portions denoted by the same reference numerals as those of the above have portions having the same functions as those described in the section of the prior art, and the description is omitted to the extent that the understanding of the present invention is not hindered.

In the multistage compression apparatus according to the present invention, the cross slider 2 (for example, Cr-Mo steel, S
The rolling bearing 5 (for example, made of SUJ2 or the like) for assisting the sliding of the CM-440 or SUJ2 or the like is repelled by a spring 7 received through a metal (for example, steel) liner plate 6. As shown in FIGS. 1 and 2, the cross slider 2 is pressed and installed on both side surfaces.

The yoke 1 is provided with a piston mounting hole 11 at the center thereof through which grease can be injected (grease is injected when the piston is not mounted).
In order that the cross slider 2, the rolling bearing 5, the liner plate 6, the spring 7, and the like can be easily housed therein, for example, two bowl-shaped yoke members 1C, 1C are formed by abutting each other.

In this case, for example, a bolt 8A is passed through a bolt hole 12 provided to penetrate the butted portion of each yoke member 1C, and a nut 8B is tightened into a screw portion of the bolt to connect the two yoke members 1C. The yoke members 1C and 1C can be easily integrated by providing a concave portion 13 for positioning at a plurality of locations on each end face of the butted portion and inserting the pin 9 therein. I can do it.

Inside the bowl-shaped yoke member 1C, the entire thickness of the liner plate 6 and the surface of the rolling bearing 5 on the side facing the liner plate 6 are immersed and face the cross slider 2 of the rolling bearing 5. A concave portion 14 is formed with a depth such that the side surface can protrude, so that the rolling bearing 5 and the liner plate 6 are difficult to move even when the cross slider 2 slides.

Further, at least two recesses 15 for inserting and positioning the springs 7 are provided at positions equidistant from the center of each recess 14 in the direction in which the cross slider 2 slides. Even if it slides, it is constituted so that the force of the spring 7 can easily act on the rolling bearing 5 evenly.

As shown in FIG. 1 and FIG. 2, four central parts of the surfaces of both cross sliders 2 which are in contact with the rolling bearings 5, 5 are respectively substantially parallel to the longitudinal direction of the rolling bearings 5, 5. Straight grease grooves 20, 20 having concave grease pockets 21 are provided. The number of the concave grease pockets 21 is not limited to four. For example, one elongated grease pocket 21 having an elongated shape may be provided in parallel with the grease groove 20, or four or more concave grease pockets may be provided. Also, an example in which one linear grease groove 20 is provided on each of both surfaces of the cross slider 2 has been described, but, for example, two linear grease grooves 20 each having a narrow width are provided on both surfaces of the cross slider 2. May be provided.

Since the grease groove 20 having one or more concave grease pockets 21 is provided on the surface of the cross slider 2 which slides with the rolling bearing 5 and has the highest temperature, the pre-filled grease is used for the concave grease pocket. 2
1 and the grease groove 20, and the grease is supplied to the sliding surface. Therefore, even if the multistage compression device of the present invention is continuously operated, the sliding surface of the rolling bearing 5 and the cross slider 2 on the sliding surface can be maintained. The grease can be suppressed, and noise, discoloration, abrasion, etc. can be suppressed.

FIG. 3A shows a preferred embodiment of the cross slider 2. In this example, four half-moon-shaped concave grease pockets 21 are respectively provided at the center portions of both surfaces of the cross slider 2 in contact with the rolling bearing 5 (not shown) substantially in parallel with the longitudinal direction of the rolling bearing 5 (not shown). Linear grease grooves 20, 20 are provided. The half-moon-shaped concave grease pocket 21 is easy to process and can increase the amount of accumulated grease.
The accumulated grease is easily supplied to the sliding surfaces of the rolling bearing 5 and the cross slider 2, so that the rolling bearing 5
Grease on the sliding surface of the cross slider 2 can be further suppressed.

FIG. 3B shows another preferred embodiment of the cross slider 2. In this example, five cylindrical grease pockets 21 each having a cylindrical shape are provided substantially in parallel with the longitudinal direction of the rolling bearing 5 (not shown) at the center of both surfaces of the cross slider 2 in contact with the rolling bearing 5 (not shown). Linear grease grooves 20, 20 are provided. Since the cylindrical grease pocket 21 can be machined by using a drill or the like, the cylindrical grease pocket 21 can be easily machined, the grease accumulation amount can be increased, and the accumulated grease is supplied to the sliding surfaces of the rolling bearing 5 and the cross slider 2. This makes it easy to prevent grease from running out on the sliding surfaces of the rolling bearing 5 and the cross slider 2.

FIG. 4 shows the positional relationship among the cross slider 2, the rolling bearing 5, and the liner plate 6. 50
Is a roller. The width w of the linear grease groove 20 is preferably about 1/5 to 1/10 of the width W of the rolling bearing 5. When a plurality of linear grease grooves 20 are provided in the cross slider 2, it is preferable that the total width w of these grease grooves is about 1/5 to 1/10 of the width W of the rolling bearing 5. If it is less than 1/10, the amount of accumulated grease is small, and there is a possibility that running out of grease on the sliding surfaces of the rolling bearing 5 and the cross slider 2 cannot be suppressed. 1 /
If it exceeds 5, the amount of accumulated grease increases, but the sliding area between the rolling bearing 5 and the cross slider 2 decreases, and the cross slider 2 may be damaged. Depth of linear grease groove 20 and concave grease pocket 21
The depth of the grease pocket 22 and the depth of the concave grease pocket 22 are determined in consideration of an appropriate amount of grease accumulation, the strength of the cross slider 2, and the like, so that the accumulated grease is sufficiently supplied to the sliding surface, and the cross slider 2 is not damaged. The design is not limited to this.

As described above, in the multistage compression apparatus of the present invention, the rolling bearing 5 is pressed against both side surfaces of the cross slider 2 by the elastic force of the spring 7 received via the liner plate 6, and the rolling bearing 5 Since the grease on the sliding surface of the cross slider 2 is suppressed, the yoke 1 is formed of, for example, aluminum / aluminum alloy for the purpose of weight reduction, and the easily worn cross slider 2 is made of bearing steel such as SUJ2. Even if the member size changes due to temperature change during use, the force with which the rolling bearing 5 is pressed by the cross slider 2 hardly changes, and the function of the rolling bearing 5 is stabilized. Wear of the slider 2 is greatly reduced, and noise, discoloration, wear, and the like can be suppressed.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

[0028]

The multistage compression apparatus according to the first aspect of the present invention can suppress running out of grease on the sliding surfaces of the rolling bearing and the cross slider even during continuous operation, and can suppress noise, discoloration, wear, and the like.

In the multistage compression apparatus according to the second aspect of the present invention, the processing of the concave grease pocket is easy, the amount of accumulated grease can be increased, and the accumulated grease is supplied to the sliding surfaces of the rolling bearing and the cross slider. This makes it easier to prevent the grease from running out on the sliding surfaces of the rolling bearing and the cross slider.

In the multistage compression apparatus according to a third aspect of the present invention, the width w of the grease groove is set to about 1/5 to 1/1 of the width W of the rolling bearing.
By setting the value to about 0, the amount of accumulated grease is in an appropriate range, and the cross slider is not likely to be damaged.

In the multistage compression apparatus according to the present invention, the force of the rolling bearing pressed by the cross slider hardly changes even if the size of the member fluctuates due to a temperature change during use, so that the function of the rolling bearing is stable. Wear on the yoke and cross slider is greatly reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a main part of an embodiment of a multistage compression apparatus of the present invention.

FIG. 2 is an exploded view of the multistage compression apparatus of the present invention shown in FIG.

FIG. 3A is a perspective view showing a main part of an embodiment of the cross slider used in the present invention shown in FIGS. 1 and 2, and FIG. 3B is a perspective view showing another cross slider used in the present invention. It is a perspective view which shows a part.

FIG. 4 is an explanatory sectional view showing a positional relationship among a cross slider, a rolling bearing, and a liner plate.

FIG. 5 is an explanatory sectional view of a conventional multistage compression apparatus.

[Explanation of symbols]

 1.1A / 1B Yoke 1C Yoke member 2.2A Cross slider 3 Crank pin 4 Crank shaft 5 Rolling bearing 6 Liner plate 7 Spring 8A Bolt 8B Nut 9 Pin 11 Piston mounting hole 12 Bolt hole 13.14.15 Concave portion 20 Grease groove 21, 22 Recessed grease pocket 101, 102, 103, 104 Reciprocating compression part 105, 106 Shaft

Claims (3)

[Claims] 1. A cross-slider having at least one pair of opposed pistons and having a rolling bearing interposed between a yoke for fixing the pistons and a cross-slider is provided to a cross-slider by an elastic force of a spring mechanism via a liner plate. A scotch yoke mechanism capable of converting a reciprocating motion of a piston from a rotating motion of a crankshaft by pressing a multi-stage compression device, wherein a surface of a cross slider in contact with a rolling bearing is substantially parallel to a longitudinal direction of the rolling bearing. A multi-stage compression device comprising at least one linear grease groove having at least one concave grease pocket. 2. The multi-stage compression apparatus according to claim 1, wherein said concave grease pocket is a concave grease pocket having a semilunar and / or cylindrical shape. 3. The multistage compression apparatus according to claim 1, wherein the width of the linear grease groove is 1/5 to 1/10 of the width of the rolling bearing.