JP2000192879A - Multistage compression device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability, and improve reliability by constituting a plunger pump by a piston inserted into a cylinder liner and a connecting rod connected to a piston, interposing a sleeve between the cylinder liner and a plunger pump main body, and fixing it with a fixing bolt. SOLUTION: A reciprocation compression part (a plunger pump) 104 of a multistage compression device is composed of a piston 54 inserted into a ceramic made cylinder liner 1 and a connecting rod 2 for connecting the piston 54 and a yoke to each other, and a sleeve 4 as a pressure resistance structure member is interposed between the cylinder liner 1 and a plunger main body 3. The cylinder liner 1 and the sleeve 4 are fixed by screwing a fixing bolt 5 into the plunger pump main body 3. It is thus possible to improve pressure resistance strength of a cylinder of the plunger pump, and it is also possible to improve durability by preventing a performance from reducing so as to improve reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage compression apparatus having a plurality of reciprocating compression sections for compressing a required gas such as nitrogen gas to a high pressure in multiple stages.

[0002]

2. Description of the Related Art Conventionally, as this kind of multistage compression apparatus,
As the number of compression stages increases, the reciprocating compression part, that is, the compression part formed by the cylinder and the piston, becomes smaller on the higher pressure side, and the diameter of the cylinder and the piston becomes smaller.
It is arranged in W type, half star type, star type, counterbalance type, etc.
A configuration is disclosed in which a mechanism that performs a multi-stage compression operation by linking and interlocking with a crankshaft is operated by a drive source such as an electric motor so that each compression unit operates in a stroke shifted to a required phase. (Japanese Society of Mechanical Engineers, September 15, 1970, “Mechanical Engineering Handbook”, Vol. 10, FIGS. 30-32).

Conventionally, as shown in FIG. 9, four reciprocating compression units 101, 102, 103 and 104 are arranged so as to reciprocate on orthogonal shafts 105 and 106, and the reciprocating compression units 101 are successively arranged. A multi-stage compression apparatus 100 in which the reciprocating compression section 104 is increased in pressure to make the reciprocating compression section 104 the final high-pressure compression section is well known, for example, in US Pat. No. 5,033,940.

In the multi-stage compression apparatus 100, the pair of opposed pistons 51 and 53 are connected to the yoke 1A, and the other pair of opposed pistons 52 and 54 are shifted by 90 degrees from the yoke 1A. It is connected to the arranged yoke 1B and is driven by an electric motor of an electric motor (not shown).
By rotating the crankshaft 55 and rotating the crankpin 56 around the crankshaft 55, a pair of pistons 51 and 53
Is reciprocated only in the direction of the axis 106, and the other pair of pistons 52 and 54 are reciprocated only in the direction of the axis 105. In this example, the fourth stage reciprocating compressor 104 is constituted by a plunger pump.

[0005]

Conventionally, the reciprocating compression section 104 is constructed by inserting a piston 54 into a cylinder 58. Since the cylinder 58 is made of ceramics from the viewpoints of linear expansion coefficient, surface finish, etc., there is a problem that the pressure resistance is weak. In addition, the cylinder 58 may be damaged due to vibration, There has been a problem of lack of reliability such as a decrease in gap accuracy and a decrease in performance. An object of the present invention is to improve the pressure resistance of a cylinder of a plunger pump in a multistage compression device in which at least one reciprocating compression unit configured to compress a required gas such as nitrogen gas to a high pressure in multiple stages is constituted by a plunger pump. The reliability of the conventional plunger pump has been improved by solving the problems of the conventional plunger pump such as vibration, damage due to the movement of the cylinder, and reduction in the accuracy of the clearance between the cylinder and the piston. And a piston having a piston ring and a guide ring (for example, a piston 51).
It is an object of the present invention to provide a multi-stage compressor in which the V value is reduced to reduce mechanical loss and improve reliability.

[0006]

According to a first aspect of the present invention, at least one reciprocating compression section of a plurality of reciprocating compression sections is constituted by a plunger pump, and a required gas is interlocked with the plurality of reciprocating compression sections. In a multi-stage compression device that performs compression in multiple stages, the plunger pump is constituted by a piston inserted into a ceramic cylinder liner, a connecting rod connected to the piston, and the like. The present invention relates to a multi-stage compressor in which a sleeve is interposed between the cylinder liner and the sleeve as a pressure-resistant structure member, and the cylinder liner and the sleeve are fixed to a plunger pump body with fixing bolts.

According to a second aspect of the present invention, in the multi-stage compression apparatus according to the first aspect, an elastic cushioning member such as a leaf spring is interposed between the connecting rod sleeve into which the connecting rod is inserted and the fixing bolt. It is characterized by the following.

According to a third aspect of the present invention, there is provided the multi-stage compression apparatus according to the first or second aspect, wherein a sleeve as a pressure-resistant structural member penetrates a surface in contact with the fixing bolt in the thickness direction and one or two sleeves are provided. It is characterized in that at least one pressure relief groove is provided.

According to a fourth aspect of the present invention, in the multistage compression apparatus according to any one of the first to third aspects, one or more pressure relief holes are provided through the connecting rod sleeve. It is a feature.

According to a fifth aspect of the present invention, in the multistage compression apparatus according to any one of the first to fourth aspects, a piston ring groove and a guide ring groove provided on the piston for mounting the piston ring and the guide ring. The width of one or both of them is larger than the width of the ring itself.

[0011]

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 cross section of an embodiment of the multistage compression apparatus of the present invention. FIG. 2 is a fourth stage reciprocating compression section (plunger pump) of the multistage compression apparatus of the present invention shown in FIG. FIG. 3 is an explanatory view showing a cross section of a third-stage reciprocating compression section (plunger pump) of the multistage compression apparatus of the present invention shown in FIG. 1. In these drawings, the portions indicated by the same reference numerals as those in FIG. 9 are portions having the same functions as those described in the section of the related art, and the description thereof will be omitted within a range not to impair the understanding of the present invention. did.

As shown in FIG. 2, the fourth stage reciprocating compressor (plunger pump) 104 of the multistage compressor 100A of the present invention shown in FIG. 54, a connecting rod 2 connected to the piston 54 (a connecting rod connecting the piston 54 and the yoke 1B), and the like.
A sleeve 4 is interposed therebetween as a pressure-resistant structural member. The cylinder liner 1 and the sleeve 4 are fixed by screwing a fixing bolt 5 into the plunger pump body 3.

As shown in FIG. 3, the third stage reciprocating compression section (plunger pump) 103 of the multistage compression apparatus 100A of the present invention shown in FIG. 1 includes a piston inserted into a ceramic cylinder liner 1a. 53 and a connecting rod 2a (the piston 53 and the yoke 1A) connected to the piston 53.
And a connecting rod, which connects the cylinder liner 1a, and a sleeve 4a as a pressure-resistant structural member interposed between the cylinder liner 1a and the plunger pump body 3a. The cylinder liner 1a and the sleeve 4a are fixed to the plunger pump body 3a by fixing bolts 5a.
The screw is fixed.

As shown in FIGS. 2 and 3, sleeves 4 and 4a are interposed as pressure-resistant structural members, and fixing bolts 5 and 5 are provided.
By fixing the cylinder liners 1 and 1a and the sleeves 4 and 4a to the plunger pump bodies 3 and 3a respectively, the pressure resistance of the ceramic cylinder liners 1 and 1a can be improved. In addition, the plunger pump having such a configuration vibrates, moves and damages the cylinder liners 1 and 1a, and the gap accuracy between the cylinders 1 and 1a and the pistons 54 and 53 is reduced, resulting in poor performance. There is no decrease, durability is improved,
A highly reliable multistage compression apparatus can be provided.

FIG. 4 is an explanatory view showing a cross section of another embodiment of the fourth stage reciprocating compression section of the multistage compression apparatus of the present invention.
As shown in FIG. 4, in the fourth stage reciprocating compression section (plunger pump) 104a of this example, the connecting rod 2
The fourth-stage reciprocating compression unit 10 shown in FIG. 2 except that an elastic buffering member 7 such as a leaf spring is interposed between the connecting rod sleeve 6 into which is inserted and the fixing bolt 5.
4 is configured in the same manner. Since the elastic cushioning member 7 such as a leaf spring is interposed between the connecting rod sleeve 6 and the fixing bolt 5, the movement of the cylinder liner 1 and the sleeve 4 is further suppressed, vibration can be reduced, and reliability is further improved. I do.

FIG. 5 is an explanatory view showing a cross section of another embodiment of the fourth stage reciprocating compression section of the multistage compression apparatus of the present invention.
As shown in FIG. 5, in the fourth stage reciprocating compression section (plunger pump) 104b of this example, the sleeve 4b as a pressure-resistant structural member is in contact with the fixing bolt 5 in the thickness direction of the sleeve 4b. One pressure relief groove 8 (see FIG. 6) is provided therethrough. The connecting rod sleeve 6a is provided with two pressure relief holes 9 that penetrate the connecting rod sleeve 6a from above to below. FIG. 6 (A)
3B shows a longitudinal section of the sleeve 4b, and FIG. 3B shows a pressure relief groove 8 provided in a surface of the sleeve 4b in contact with the fixing bolt 5 in a thickness direction of the sleeve 4b. Reference numeral 10 denotes an annular groove provided on the inner wall surface of the sleeve 4b. The gas between the sleeve 4b and the plunger pump body 3 passes through the pressure release groove 8 and then escapes through the pressure release hole 9 into the multistage compression device of the present invention as indicated by the arrow. Similarly, gas between the cylinder liner 1 and the sleeve 4b and between the connecting rod 2 and the connecting rod sleeve 6a also escapes into the multistage compression device of the present invention through the pressure release hole 9. By doing so, the pressure increase behind the cylinder can be prevented, and the connecting rod 2 and connecting rod sleeve 6
a can be prevented, and the piston 54 can move smoothly, so that the input can be reduced and the piston 5
4 is prevented, and the reliability is improved.

FIG. 8 shows a conventional piston equipped with a piston ring and a guide ring (for example, the piston 5 shown in FIG. 9).
It is explanatory drawing which shows the cross section of 1). As shown in FIG.
The piston ring 11 and the guide ring 12 are fitted in the piston ring groove 11a and the guide ring groove 12a provided in the piston 51, respectively. FIG. 7 is an explanatory view showing a cross section of a piston 51a used in the present invention, which is provided with a piston ring and a guide ring. As shown in FIG. 7, the piston ring 11 is fitted and mounted in a piston ring groove 11b having a width larger than the width of the piston ring 11. The guide ring 12 is fitted in the guide ring groove 12a. With this configuration, when the piston 51a reciprocates, the piston ring 11 also moves into the piston ring groove 1.
1b, the load applied to the piston ring 11 can be reduced, and the PV value can be reduced as compared with the case of the piston 51 shown in FIG.
Mechanical loss can be reduced. Guide ring 12
And the guide ring groove 12a
And the piston ring groove 11b.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the present invention. For example, a configuration in which a plurality of reciprocating compression units are arranged in the above-described L-type, V-type, W-type, semi-star-type, star-type, counterbalance-type, or the like, or three or five or more reciprocating compression units are star-type May be a multi-stage compression device having a configuration arranged in the first stage.

[0019]

According to the present invention, a sleeve is interposed between the cylinder liner and the plunger pump body as a pressure-resistant structural member, and the cylinder liner and the sleeve are fixed to the plunger pump body with fixing bolts. Improves pressure resistance and vibrates,
Since it is possible to prevent the performance of the cylinder from being damaged due to the movement of the cylinder and to reduce the accuracy of the clearance between the cylinder and the piston, a highly reliable multi-stage compressor with improved durability can be provided.

By mounting an elastic cushioning member such as a leaf spring between the connecting rod sleeve into which the connecting rod is inserted and the fixing bolt, the movement of the cylinder liner and the sleeve can be further suppressed, and vibration can be reduced. Reliability is further improved.

By providing one or two or more pressure relief grooves through a sleeve as a pressure-resistant structural member in the thickness direction through a surface in contact with the fixing bolt, a pressure increase behind the cylinder can be prevented, thereby reducing input. Prevention of galling of the piston improves reliability.

By providing one or more depressurizing holes through the connecting rod sleeve, pressure increase between the connecting rod sleeve and the connecting rod can be prevented and the piston can move smoothly, so that the input can be reduced. In addition, the galling of the piston is prevented and the reliability is improved.

[0023] By making one or both of the piston ring groove and the guide ring groove provided on the piston for mounting the piston ring and the guide ring larger than the width of the ring itself, the PV of the piston ring and the guide ring is increased. Value can be reduced, and mechanical loss can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cross section of an embodiment of a multistage compression apparatus of the present invention.

FIG. 2 is an explanatory view showing a cross section of one embodiment of a fourth stage reciprocating compression section of the multistage compression apparatus of the present invention shown in FIG.

FIG. 3 is an explanatory view showing a cross section of an embodiment of the third stage reciprocating compression section of the multistage compression apparatus of the present invention shown in FIG. 1;

4 is an explanatory view showing a cross section of another embodiment of the fourth stage reciprocating compression section of the multistage compression apparatus of the present invention shown in FIG.

FIG. 5 is an explanatory view showing a cross section of another embodiment of the fourth stage reciprocating compression section of the multistage compression apparatus of the present invention shown in FIG. 1;

6A is an explanatory view showing a longitudinal section of a sleeve which is a pressure-resistant structural member shown in FIG. 5, and FIG.
FIG. 3 is a bottom view of a sleeve which is a pressure-resistant structural member shown in FIG.

FIG. 7 is an explanatory view of a cross section of a piston equipped with a piston ring and a guide ring used in the present invention.

FIG. 8 is an explanatory view of a cross section of a conventional piston equipped with a piston ring and a guide ring.

FIG. 9 is an explanatory view showing a cross section of a conventional multistage compression device.

[Explanation of symbols]

 100, 100A Multi-stage compressor 101 First-stage reciprocating compression unit 102 Second-stage reciprocating compression unit 103 Third-stage reciprocating compression unit 104 Fourth-stage reciprocating compression unit 105, 106 Shaft 1A, 1B Yoke 51-54 Piston 57-58 Cylinder 1, 1a Ceramic cylinder liner 2, 2a Connecting rod 3, 3a Plunger pump body 4, 4a, 4b Sleeve as pressure-resistant structural member 5, 5a Fixing bolt 6, 6a Connecting rod sleeve 7 Elastic cushioning member 8 Depressurization Groove 9 Press-release hole 11 Piston ring 12 Guide ring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuo Sakamoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Makoto Mama 2-5-5 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Eiichi Shimizu 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka 2-5 Sanyo Electric Co., Ltd. (72) Kazuya Sato 2 Keihan-hondori, Moriguchi-shi, Osaka F-term (reference) 3H076 AA04 AA12 BB01 BB26 CC25 CC30

Claims (5)

[Claims] 1. A multi-stage compressor in which at least one reciprocating compression section of a plurality of reciprocating compression sections is constituted by a plunger pump, and the plurality of reciprocating compression sections are interlocked to compress a required gas in multiple stages. The jar pump includes a piston inserted into a ceramic cylinder liner, a connecting rod connected to the piston, and the like.A sleeve is interposed between the cylinder liner and the plunger pump body as a pressure-resistant structural member. A multi-stage compressor in which a cylinder liner and a sleeve are fixed to a plunger pump body with fixing bolts. 2. The multi-stage compression apparatus according to claim 1, wherein an elastic buffer member such as a leaf spring is interposed between the connecting rod sleeve into which the connecting rod is inserted and the fixing bolt. 3. A sleeve as a pressure-resistant structural member penetrates a surface in contact with a fixing bolt in a thickness direction, and one or two sleeves are provided.
3. The multi-stage compression device according to claim 1, wherein at least one pressure relief groove is provided. 4. The multi-stage compression apparatus according to claim 1, wherein one or two or more pressure relief holes are provided through the connecting rod sleeve. 5. The method according to claim 1, wherein the width of one or both of the piston ring groove and the guide ring groove provided on the piston for mounting the piston ring and the guide ring is larger than the width of the ring itself. The multistage compression apparatus according to any one of claims 1 to 4.