JP2002285960A - Multi-stage compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-stage compressor of high reliability, which has a simple structure, and assures safe operation by precluding the occurrence of deterioration of an insulation material in a motor part or explosion due to sparks, even if the gas to be compressed is oxygen, hydrocarbons, etc. SOLUTION: The multi-stage compressor is equipped with a multi-stage compression part of a structure, with a plurality of reciprocative compressing parts being provided in a sealed housing and discharging the gas A supplied externally into the sealed housing upon compressing at a plurality of stages and the motor part installed in a sealed vessel with storing another gas B for driving the multi-stage compression part, wherein the two are coupled together, in such a way that the gases A and B do not communicate, and thereby the operation is conducted, while the pressures of two gases A and B are kept approximately the same.

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 for compressing a required gas such as nitrogen gas, oxygen gas or hydrocarbon to a high pressure in multiple stages, and more particularly to a gas such as oxygen gas or hydrocarbon. The present invention also relates to a highly reliable multi-stage compression device that can safely operate.

[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 section, that is, the compression section formed by the cylinder and the piston, becomes smaller on the higher pressure side, and the diameters of the cylinder and the piston are reduced.
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. 3, four reciprocating compressors 101, 102, 103, and 104 are arranged so as to reciprocate on orthogonal shafts 105 and 106, and sequentially from the reciprocating compressor 101. A multi-stage compression apparatus 100 in which the pressure is increased 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,
By rotating the crankshaft 56 and rotating the crankpin 55 around the crankshaft 56, 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.

[0005] As shown in FIG.
A plurality of reciprocating compressors 101, 102, 103, and 104 (not shown) are provided in a sealed housing 20 to compress a gas in multiple stages, and a hermetic housing for driving the multistage compressor 107. The motor unit 2 installed in the container 1 is connected and configured. The connection part 3 on the upper part of the closed casing 1 and the connecting part 21 of the closed housing 20 are connected to each other, and the motor unit 2 is housed in the closed casing 1. 4 is a bearing, 5 is a bearing,
Reference numeral 6 denotes a seal portion, and reference numeral 7 denotes a through hole provided through the bearing portion 4.

The motor section 2 is composed of a stator 9 having a winding 8 and a rotor 10 provided inside the stator 9, and a crank shaft 56 is connected to the center of the rotor 10 in a penetrating state. . Reference numeral 11 denotes a wiring portion, which has a structure in which gas inside the closed container 1 does not go outside from the wiring portion 11.

When the operation of the multi-stage compressor 100 is started,
After gas is introduced into the closed housing 20 from the outside through the inlet 22, the gas is sucked into the reciprocating compression unit 101 and compressed, the pressure is sequentially increased to the reciprocating compression units 102 to 104, and the high-pressure gas is discharged from the outlet 23 to the outside. I do. Externally sealed housing 2
A part of the gas contained in the motor unit 2 flows out through the through hole 7 of the bearing unit 4 to the internal space 12 in the closed storage container 1.
It is designed to cool down.

[0008]

However, when compressing a gas such as an oxygen gas or a hydrocarbon using the multi-stage compressor 100, the gas such as an oxygen gas or a hydrocarbon passes through the through hole 7 of the bearing portion 4. When flowing into the internal space 12 in the closed storage container 1, there is a problem that the insulating material of the electric motor unit 2 may be degraded or an explosion due to a spark may occur. An object of the present invention is to provide a reliable, simple, and safe driving that prevents the occurrence of an explosion due to sparks or deterioration of the insulating material of the electric motor unit 2 even when the gas is oxygen gas, hydrocarbon, or the like. An object of the present invention is to provide a multi-stage compression device having a configuration.

[0009]

SUMMARY OF THE INVENTION A multi-stage compression apparatus according to claim 1 of the present invention has been made to solve the conventional problems, and has a plurality of reciprocating compression portions in a closed housing. A multi-stage compression unit for compressing and discharging gas A supplied from outside into the multi-stage in a multi-stage, and an electric motor unit installed to drive the multi-stage compression unit in a closed storage container containing gas B, A multistage compression apparatus provided with a gas A and a gas B connected so as not to communicate with each other, characterized in that the gas A and the gas B are operated at substantially the same pressure.

[0010] The multi-stage compression apparatus according to claim 2 of the present invention comprises:
The multi-stage compression apparatus according to claim 1, wherein a pipe is provided for once passing the gas B supplied from the outside into the closed storage container to the outside to circulate and use.

[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 partial cross section of a side surface of an embodiment of the multi-stage compression device of the present invention, and FIG. 2 is an explanatory diagram illustrating a bearing portion of the multi-stage compression device of the present invention shown in FIG. It is. In these drawings, the portions indicated by the same reference numerals as those in FIGS. 3 and 4 are portions having the same functions as those described in the section of the related art, and will be described to the extent that the understanding of the present invention is not hindered. Was omitted.

Referring to FIG. 1, a multi-stage compression apparatus 10 according to the present invention is shown.
0A means that the bearing portion 4 is not provided with the through-hole 7, the inert gas B such as nitrogen is put in the closed container 1, and the pressure of the gas A and the gas B is almost the same. The configuration is the same as that of the multi-stage compression apparatus 100 shown in FIGS.

In the multistage compression apparatus 100A of the present invention, since the through hole 7 is not provided in the bearing portion 4, the gas A supplied into the closed housing 20 does not flow into the closed storage container 1.

Since the gas B having substantially the same pressure as the gas A is contained in the closed container 1, for example, as shown in FIG. 2, a shaft sealing material 61 (between the crankshaft 56 and the bearing portion 4). For example, with a simple configuration in which an O-ring 62 is interposed between a Teflon (registered trademark) -based shaft seal material and the like,
The gas A and the gas B can be prevented from communicating with each other by preventing the gas A and the gas B from leaking from the bearing portion 4.

In this way, even if the gas A is a gas such as oxygen gas or hydrocarbon, the gas A supplied into the closed housing 20 does not flow out into the closed storage container 1, so that the insulating material of the motor unit 2 Prevents deterioration of the vehicle and explosion due to sparks, and enables safe driving.

As shown in FIG. 1, a pump P and a heat exchanger for once circulating the gas B supplied from the outside of the multistage compression apparatus 100A of the present invention into the closed storage container 1 for use. If the temperature of the gas B is controlled by cooling by providing the pipe line 13 provided with the
Temperature rise can be suppressed, and more stable and safe driving can be achieved.

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. For example, in the above embodiment, the gas A is a gas such as an oxygen gas or a hydrocarbon, and the gas B is an inert gas such as a nitrogen gas. However, the gas A is also an inert gas such as a nitrogen gas. And gas A and gas B may be the same or different.

Further, in the above-described embodiment, the multistage compression apparatus including the four reciprocating compression units 101, 102, 103, and 104 has been described. However, the number of reciprocating compression units is not limited to four. Alternatively, the number may be three or five or more.

[0019]

The multistage compression apparatus according to the first aspect of the present invention comprises a plurality of reciprocating compression portions in a closed housing, and compresses and discharges gas A supplied from outside into the closed housing in multiple stages. A multi-stage compression section, and a motor section provided for driving the multi-stage compression section in a sealed container containing gas B, which are connected so that the gas A and the gas B do not communicate with each other. In the compression device, the pressure of the gas A and the gas B is set to be substantially the same, so that the operation is performed.
Simple configuration, safe operation and high reliability, even if the gas to be compressed is a gas such as oxygen gas, hydrocarbon, etc. Effect.

According to a second aspect of the present invention, there is provided a multistage compression apparatus,
In the multistage compression apparatus according to the first aspect, a pipe is provided for once passing the gas B supplied from the outside into the closed storage container to the outside and circulating the gas B for use. The same effect can be obtained, and the temperature of the gas B can be controlled to suppress a rise in the temperature of the electric motor unit, thereby achieving a more remarkable effect of more stable and safe operation.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view illustrating a bearing portion of the multi-stage compression device of the present invention shown in FIG.

FIG. 3 is an explanatory diagram illustrating a cross section of a multistage compression section of a conventional multistage compression device.

FIG. 4 is an explanatory diagram illustrating a side surface of a conventional multi-stage compression device with a partial cross section.

[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 107 Multi-stage compression unit 51, 52, 53, 54 Piston 1A, 1B Yoke 55 Crank pin 56 Crankshaft 1 Airtight storage container 2 Electric motor unit 3 Connection unit 4 Bearing unit 5 Bearing 6 Seal unit 7 Through hole 8 Winding 9 Stator 10 Rotor 11 Wiring unit 12 Internal space 13 Tube Road 14 Heat exchanger 20 Hermetic housing 21 Joint of hermetic housing 22 Inlet 23 Outlet

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tetsuya Kato 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Kishi Atom 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Eiju Fukuda 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Prefecture (72) Inventor Takayuki Mizuno 2 Keihan-Hondori, Moriguchi-shi, Osaka 3-5-5 Sanyo Electric Co., Ltd. (72) Inventor Kazuya Sato 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3H076 AA04 AA12 BB04 BB28 CC07 CC25

Claims (2)

[Claims] 1. A sealed housing having a plurality of reciprocating compressing portions in a sealed housing, a multi-stage compressing portion for compressing and discharging gas A supplied from outside into the sealed housing in multiple stages, and a sealed housing containing gas B. A multi-stage compression device comprising a motor unit installed in the vessel for driving the multi-stage compression unit, and connected so that the gas A and the gas B do not communicate with each other. A multi-stage compression device characterized by operating at substantially the same pressure. 2. The multi-stage compression apparatus according to claim 1, wherein a pipe is provided for temporarily circulating the gas B supplied from the outside into the closed storage container to the outside for use.