JP3469809B2 - Multistage compression device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multistage compressor for compressing a required gas such as nitrogen gas to a high pressure in multiple stages, and more specifically to a highly reliable device which suppresses grease from scattering in a yoke. The present invention relates to a multi-stage compression device.

As a multi-stage compressor of this type, as the number of compression stages increases, the reciprocating compression section, that is, the compression section formed by the cylinder and the piston, is made smaller in diameter as the pressure becomes higher, and the diameters of the cylinder and the piston are reduced.・ W-type, half-star type, star type, counter-balanced type, etc. are arranged, and in order to operate in the stroke where each compression part is shifted to the required phase, it is connected to the crankshaft and interlocked to achieve multiple stages. A configuration in which a mechanism that performs a compression operation is driven by a drive source such as an electric motor is disclosed (September 15, 1970, "Mechanical Engineering Handbook", 10th volume, Figures 30 to 32, etc.).

Further, conventionally, as shown in FIG. 6, a shaft 10 in which four reciprocating compression units 101, 102, 103 and 104 are orthogonal to each other is used.
A multi-stage compression device 100, which is arranged so as to be reciprocally interlocked on 5.106, and sequentially increases the pressure from the reciprocating compression unit 101 and uses the reciprocating compression unit 104 as the final high-pressure compression unit, is disclosed in, for example, US Pat. No. 5,033. , 940 specification and the like.

In the multi-stage compression device 100, the pair of opposed pistons 51 and 53 are connected to the yoke 1A, and the cross slider 2A provided movably across the shaft 106 in the yoke 1A is provided with the crank pin 3. It is connected to the crankshaft 4 via. Further, another pair of opposed pistons 52, 54 are connected to the yoke 1B which is arranged so as to be offset by 90 degrees from the yoke 1A, and a cross slider 2B that is movably provided so as to cross the shaft 105 in the yoke 1B is also provided. It is connected to a crankshaft 4 via a crankpin 3.

When the crank shaft 4 is rotated by an electric motor (not shown) to rotate the crank pin 3 around the crank shaft 4, the yoke 1A crosses the displacement of the crank pin 3 in the direction of the shaft 105. Since the slider 2A moves and responds, and the yoke 1A moves in the direction of the shaft 106, the pair of pistons 5
1.53 reciprocates only in the direction of the axis 106.

On the other hand, in the yoke 1B, the cross slider 2B moves in the direction of the shaft 106 to correspond to the shaft 106.
Since the yoke 1B moves in the direction of 5, the pair of pistons 52 and 54 reciprocate only in the direction of the shaft 105.

In order to obtain a smooth reciprocating motion of the pistons 51, 52, 53, 54 from the constant speed rotation of the crankshaft 4, the cross slider 2A slides smoothly within the yoke 1A, It is necessary for the cross slider 2B to slide smoothly within the yoke 1B. Therefore, the sliding part is filled with grease before use.

[0008]

However, in the multi-stage compression device 100, since the sliding portion between the yoke 1A and the cross slider 2A and the sliding portion between the yoke 1B and the cross slider 2B are in an open state, the multi-stage compression device 100 is in operation. There is a problem that the grease is scattered and the grease is not sufficiently supplied to the sliding portion. If the supply of grease to the sliding portion is insufficient in this way, vibration, wear, etc. cannot be suppressed during long-term operation, and reliability is reduced.

On the other hand, in the case of the multi-stage compression device in which the piston is not provided at the facing position, the shaft of the piston on the side facing the position is apt to swing during operation, and the shaft of the piston is swayed. Then, there is a problem that reliability is deteriorated due to adverse effects such as chewing.

It is an object of the present invention to prevent grease from scattering during operation of a multi-stage compressor for compressing a required gas such as nitrogen gas to a high pressure in multiple stages, thereby suppressing vibration, noise, wear and the like. Is to provide a high-stage multi-stage compression device,
Another object of the present invention is to provide a highly reliable multi-stage compression device which suppresses the occurrence of swaying of the shaft of the piston during operation even when the piston is not provided at the opposing position.

[0011]

The invention according to claim 1 of the present invention comprises at least one pair of opposed pistons, a yoke for fixing the pistons, and a cross slider for slidingly moving in the yoke, It is a multi-stage compression device that can convert the reciprocating motion of the piston from the rotary motion of the crankshaft by a Scotch yoke mechanism.The cover has an opening at the center so as not to hinder the motion of the crankpin. The present invention relates to a multi-stage compression device, which is fixed and arranged so as to be sandwiched.

According to a second aspect of the present invention, in the multi-stage compression device according to the first aspect, the cover is shrink-fitted to a yoke and fixedly disposed.

According to a third aspect of the present invention, at least the multi-stage compression device according to the first or second aspect is provided.
A multi-stage compression device in which a pair of connecting rods are not provided with pistons at opposite positions, and the pistons are provided.
A connecting rod fixed to the yoke and a cylinder that guides the connecting rod so that the connecting rod can reciprocate are arranged at the above-mentioned position .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
~ It will be described in detail with reference to FIG. FIG. 1 is an explanatory diagram showing a main part of an embodiment of a multi-stage compression device of the present invention, and FIG. 2 is an explanatory diagram of a yoke, a cross slider and the like of the multi-stage compression device of the present invention shown in FIG. 3 is an explanatory view showing a partial cross section of a yoke, a cross slider and the like of the multi-stage compression device of the present invention shown in FIG. 1, and FIG. 4 is a side view of the yoke shown in FIG. FIG. 5 is an explanatory diagram showing a main part of another multi-stage compression device of the present invention. Incidentally, in these figures, the portions denoted by the same reference numerals as those in FIG. 6 have the same functions as those described in the section of the prior art, and the description thereof will be omitted within the range that does not hinder the understanding of the present invention. did.

The multi-stage compression apparatus 100 of the present invention shown in FIG.
A is four reciprocating compression units 101, 102, 103, 10
4 are arranged so as to be reciprocally interlocked on the orthogonal shafts 105 and 106, and the gas compressed in each reciprocating compression section is transferred through the pipe lines 5 to 8 to sequentially reciprocate the compression section 101 to the reciprocating compression section 104. 6 except that the pressure is increased and the cover 10 having the opening 9 in the center is fixed so as to sandwich the yokes 1A and 1B.
It is similar to the multi-stage compression device 100 shown in FIG. Hereinafter, the case of the yoke 1A will be described.
Is similar to the yoke 1A.

As shown in FIGS. 2 to 4, the opening 9 of the cover 10 interferes with the movement of the crank pin 3 because the end of the opening 9 contacts the crank pin 3 during operation of the apparatus. It is provided in the central part so that it will not exist. As shown in FIG. 4, a portion of the cover 10 other than the opening 9 is fixed and disposed so as to sandwich the yoke 1A so as to cover the opening of the yoke 1A. The material of the cover 10 may be metal, non-metal such as ceramics, FRP, engineering plastic, or a combination thereof, and is not particularly limited. Engineered plastics having physical and mechanical properties capable of withstanding temperature, pressure, etc. during operation of the apparatus, resistant to gas to be compressed, and having grease resistance are preferably used.

In FIG. 3, 11 is a rolling bearing, 12 is a liner plate, 13 is a spring, and 14 is a fixture.
The rolling bearing 11 is pressed against both side surfaces of the cross slider 2A by the elastic force of the spring 13 received via the liner plate 12, and assists the sliding of the cross slider 2A in the yoke 1A. In the multi-stage compression device 100A of the present invention, the cover 10 is arranged so as to be fixed so as to sandwich the yokes 1A and 1B. Therefore, it is possible to prevent the grease from scattering from the inside of the yokes 1A and 1B during the operation of the device. In the multi-stage compression device 100A of the present invention, the grease is sufficiently supplied to the sliding portions in the yokes 1A and 1B in this manner, so that vibration, noise, wear, etc. can be suppressed even during long-term operation, and reliability is improved. To do.

If the cover 10 is shrink-fitted and fixed to the yokes 1A and 1B and arranged, the cover 10 can be easily assembled and the cover 10 can be firmly arranged, so that the cover 10 can be prevented from falling off. Reliability is further improved.

The multi-stage compression device 100 of the present invention shown in FIG.
B (three-stage compression device) is a piston 5 of the reciprocating compression unit 102.
No piston is provided at the position 104A facing the position 2. The pistons 51, 53 of the three reciprocating compression units 101, 102, 103 reciprocate only in the direction of the shaft 105, and the piston 52 and the connecting rod (connecting rod) 5
4A is a multi-stage compression device which is arranged so as to reciprocate on the shaft 106 and sequentially increases in pressure from the reciprocating compression unit 101 to the reciprocating compression unit 103 to use the reciprocating compression unit 103 as the final high-pressure compression unit. The connecting rod 54A is fixedly arranged on the yoke 1B at a position 104A facing the piston 52, and the connecting rod 54A is arranged inside a cylinder 15 which guides reciprocally.

As described above, in the multi-stage compression device 100B, the pair of opposed pistons 51 and 53 are the yoke 1A.
The other pair of opposed pistons 52 and connecting rod 54A are connected to the yoke 1B which is arranged 90 degrees away from the yoke 1A, and the crankshaft 4 is rotated by an electric motor (not shown) or the like. 3 is rotated around the crankshaft 4 so that the pair of pistons 51 and 53 reciprocate only in the direction of the shaft 105, and the other pair of pistons 52 and the connecting rod 54A reciprocate only in the direction of the shaft 106. Has become.

In the multi-stage compression device 100B of the present invention, the cover 10 is fixedly arranged so as to sandwich the yokes 1A and 1B as in the multi-stage compression device 100A of the present invention. Can be suppressed and the grease can be sufficiently supplied to the sliding portion. Therefore, vibration, noise, wear, etc. can be suppressed even during long-term operation, and reliability is improved. Further, since the connecting rod 54A fixed to the yoke 1B and the cylinder 15 that guides the connecting rod 54A to reciprocate are arranged, it is possible to prevent the shaft of the piston 52 facing the connecting rod 54A from being swayed during operation, and to bite. The reliability is further improved because stable operation is possible without the occurrence of such problems.

Since the present invention is not limited to the above embodiments, various modifications can be made without departing from the spirit of the claims. For example, it may be a multistage compression device having a configuration in which a plurality of reciprocating compression units are arranged in the above-mentioned half-star type , star type, counterbalance type, or the like.

[0023]

The multistage compression device of the present invention, in which a cover having an opening at the center thereof so as not to hinder the movement of the crankpin is fixedly arranged so as to sandwich the yoke, is provided from inside the yoke during operation. Since it is possible to suppress the grease from scattering, the grease can be sufficiently supplied to the sliding portion of the cross slider, and vibration, noise, wear, etc. can be suppressed even during long-term operation, and the reliability is high.

It is preferable that the cover is shrink-fitted and fixed to the yoke, which facilitates the assembly of the cover, and the cover can be firmly arranged on the yoke to prevent the cover from falling off. The property is further improved.

Even if at least one pair of pistons are not provided at opposing positions, the connecting rod fixed to the yoke and the cylinder for guiding the connecting rod so as to reciprocate are arranged at the position so as to face the connecting rod. It is possible to prevent the shaft of the rotating piston from swaying and improve reliability.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of an embodiment of a multi-stage compression device of the present invention.

FIG. 2 is an explanatory diagram of a yoke, a cross slider and the like of the multi-stage compression device of the present invention shown in FIG.

FIG. 3 is an explanatory view showing a partial cross section of a yoke, a cross slider, etc. of the multi-stage compression device of the present invention shown in FIG.

FIG. 4 is a side view of the yoke shown in FIG.

FIG. 5 is an explanatory diagram showing a main part of another multi-stage compression device of the present invention.

FIG. 6 is a cross-sectional explanatory view of a conventional multistage compression device.

[Explanation of symbols]

100, 100A, 100B multi-stage compression device 101 First Stage Reciprocating Compressor 102 Second stage reciprocating compression unit 103 Third Stage Reciprocating Compressor 104 4th stage reciprocating compression section 105, 106 axis 1A, 1B York 2A, 2B Cross slider 51-54 Piston 3 crank pins 4 crankshaft 9 openings 10 covers 54A connecting rod (connecting rod) 104A Position without piston 15 cylinders

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Makoto Inventor 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Takehiro Nishikawa 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5 in Sanyo Electric Co., Ltd. (72) Inventor Kazuya Sato 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-10-266955 (JP, A) JP Japanese Unexamined Patent Publication No. 9-60581 (JP, A) Japanese Unexamined Patent Publication No. 2-64274 (JP, A) Japanese Unexamined Patent Publication No. 60-233379 (JP, A) Japanese Unexamined Patent Publication No. 59-190486 (JP, A) Japanese Utility Model No. 51-68006 (JP , U) Jitsukai Sho 58-169177 (JP, U) Japanese Patent Publication 41-464 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04B 35/01 F04B 27/02 F04B 37/12

Claims (3)

(57) [Claims] 1. A scotch yoke mechanism comprising at least one pair of opposed pistons, a yoke for fixing the piston, and a cross slider for slidingly moving in the yoke, and reciprocating motion of the piston from rotational motion of a crankshaft. A multi-stage compression device that can be converted by means of a cover having an opening in the center so as not to hinder the movement of the crank pin, and is fixedly arranged so as to sandwich the yoke. And multi-stage compression device. 2. The multi-stage compression device according to claim 1, wherein the cover is shrink-fitted onto a yoke and fixed thereto. 3. A multi-stage compressor in which at least one pair of connecting rods is not provided with a piston at a position facing each other, and at the position where no piston is provided , the connecting rod fixed to the yoke and the connecting rod are reciprocated. The multistage compression device according to claim 1 or 2, wherein a cylinder for movably guiding is provided.