JPH06147121A - Reciprocation gas compressor equipped with gas leak processor off shaft seal portion - Google Patents

Abstract

PURPOSE:To prevent compressed gas from being mixed with gas to be used for gas leak processing of a shaft seal portion. CONSTITUTION:Between a cylinder 10 and a crankcase 40, a first chamber 20 that forms a shut-up chamber, and a second chamber 30 that forms an atmosphere open chamber, are provided, and an oilless shaft seal device 50 is provided, with a lantern ring A and a lantern ring B interposed, between the cylinder 10 and the first chamber 20, and the first chamber 20 is connected to a purge tank 201, and an oilless shaft seal device 60 is provided, with a lantern ring C and a lantern ring D interposed, between the first chamber 20 and the second chamber 30, and the lantern ring D is connected to a recovery tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating gas compressor provided with a gas leakage treatment device for a shaft sealing portion.

[0002]

2. Description of the Related Art Conventionally, when the compressed gas of a reciprocating gas compressor leaks from its shaft seal portion, which interferes with the operation of the compressor, it has been a special feature as a gas leak treatment device for the shaft seal portion of this compressor. There is the one described in Japanese Patent Publication No. 64-1671. However, if a gas for treating gas leakage of the shaft sealing portion is mixed in the gas to be compressed, there is a possibility of trouble or there is a possibility that the gas to be compressed is present. It could not be used if gas components penetrate into the crankcase and cause damage.

[0003]

DISCLOSURE OF THE INVENTION The present invention is directed to a reciprocating gas compression equipped with a gas leakage treatment device for a shaft seal portion which is free from the possibility that a gas used for the gas leakage treatment of the shaft seal portion will be mixed into a gas to be compressed. Machine.

Further, the present invention provides a reciprocating gas compressor provided with a gas leakage treatment device for a shaft seal portion, which does not have a risk that a gas component in a gas to be compressed leaks to a crankcase to cause a trouble. .

[0005]

In order to achieve the above object, the reciprocating gas compressor of the present invention has a first chamber in which a closed chamber is formed between a cylinder 10 and a crankcase 40 as shown in the drawing. 20 and a second chamber 30 forming an atmosphere open chamber, and an oilless shaft sealing device 50 in which a lantern ring A and a lantern ring B are interposed between the cylinder 10 and the first chamber 20. B is filled with a gas 81 that does not interfere with the compressed gas and has a pressure higher than the suction pressure, and the gas leaking from the cylinder 10 to the first chamber 20 via the lantern ring A and the gas enclosed in the lantern ring B are compressed. Returning to the machine suction line 501, the first chamber 20
To the purge tank 201, and the first chamber 20 and the second chamber 3
An oilless shaft sealing device 60 having a lantern ring C and a lantern ring D interposed therebetween is provided between the lantern ring C and 0, and an inert gas 91 slightly higher than the pressure in the first chamber 20 is filled in the lantern ring C, and the lantern ring The gas 81 leaked into the first chamber 20 after being enclosed in B and the gas 91 leaked from the second chamber 30 into the first chamber 20 are collected in the purge tank 201 and enclosed in the lantern ring C via the lantern ring D. The gas 91 leaked to the second chamber 30 can be collected in the collection tank 302.

In the present invention, the lantern rings A, B,
C or D is a ring in a known oilless gland packing shaft sealing device, which forms a space surrounding the piston rod between the gland packings and allows the space to communicate with the outside through a communication pipe.

[0007]

Embodiment 1 An embodiment of the present invention is shown in FIGS.

The reciprocating gas compressor of this example is composed of a cylinder 10
A closed chamber is formed between the crankcase 40 and the crankcase 40.
An oilless shaft seal device 50 in which a chamber 20 and a second chamber 30 forming an atmosphere open chamber are provided, and a lantern ring A and a lantern ring B are interposed between the cylinder 10 and the first chamber 20.
Is provided, the first chamber 20 is communicated with the purge tank 201, and the lantern ring C and the lantern ring D are interposed between the first chamber 20 and the second chamber 30.
The lantern ring B is filled with a gas 81 that does not interfere with the compressed gas and has a pressure higher than the suction pressure. The gas leaking from the cylinder 10 to the first chamber 20 through the lantern ring A and the lantern ring B are filled. The generated gas is returned to the compressor suction line 501 and is sealed in the lantern ring B in the purge tank 201 to leak the gas 81 to the first chamber 20 and the gas 91 to the first chamber 20 from the second chamber 30.
Is collected, the inert gas 91 slightly higher than the pressure in the first chamber 20 is filled in the lantern ring C, the lantern ring C is filled in via the lantern ring D, and the gas leaked to the second chamber 30 is connected to the communication pipe 301. 11 is a piston, 12 is a piston rod, 101 is a suction valve, 102 is a discharge valve, 103 is a suction snubber, 1031 is a suction port, 105 is a discharge snubber, and 1 is a suction valve.
Reference numeral 051 is a discharge port, 202 is a detoxification tower communicating with the purge tank 201, 70 is a shaft sealing device between the second chamber 30 and the crankcase 40, 80 is a gas 81 supply line, 82 is a pressure reducing valve, and 83 is A flow meter, 84 is an opening / closing valve, 90 is a gas 91 supply line, 92 is a pressure reducing valve, 93 is a flow meter, and 94 is an opening / closing valve.

Further, 104 is a gas suction pressure gauge, 106 is a gas discharge pressure gauge, 85 is a gas 81 supply pressure gauge, and 203 is a gas pressure gauge.
Is an indoor pressure gauge of the first chamber 20, 95 is a supply pressure gauge of the gas 91, 1041, 1061, 851, 2031 and 951.
Is an on-off valve.

[0010]

Therefore, for example, alternative CFC gas (composition example, hydrogen fluoride 3-40 MOL%, organic gas 4-30 MOL%,
When compressing hydrogen chloride (50 to 92 mol%), dry hydrogen chloride gas 81 is sealed in the lantern ring B of the shaft sealing device 50 at a pressure higher than the suction pressure, and the lantern ring C of the shaft sealing device 60 is filled with the first chamber 20 of the first chamber 20. A dry nitrogen gas or dry air 91 slightly higher than the pressure is filled.

Then, the compressed gas that leaks from the cylinder 10 to the first chamber 20 via the lantern ring A and the hydrogen chloride gas that is sealed in the lantern ring B and leaks to the first chamber 20 are taken into the compressor suction line. Even if it is returned to 501, the compressed gas is not damaged. At the same time, the gas 91 leaking from the second chamber 30 to the first chamber 20 and the lantern ring B are sealed, and the gas 81 leaking to the first chamber 20 is collected in the purge tank 201. Furthermore, the gas 9 leaked to the second chamber 30
1 is collected in the collection tank 302.

[0012]

Therefore, according to the present invention, there is no possibility that the gas to be compressed will be impaired (for example, the purity will be lowered if nitrogen gas is mixed into the CFC substitute gas).

Further, the compressed gas or the enclosed gas may enter the crankcase to cause a trouble (for example, if the hydrogen chloride gas or the enclosed gas in the CFC substitute enters the crankcase, the lubricating oil in the crankcase may be deteriorated). There is no fear of contamination and deterioration of lubricity.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part of the present invention.

[Explanation of sign]

 10 Cylinder 20 First Chamber 201 Purge Tank 30 Second Chamber 40 Crankcase 50,60 Shaft Sealing Device 501 Compressor Suction Line A, B, C, D Lantern Ring 81, 91 Filled Gas

Claims (1)

[Claims] 1. A first chamber 20 forming a closed chamber and a second chamber 30 forming an atmosphere open chamber are provided between the cylinder 10 and a crankcase 40, and the first chamber 20 is provided between the cylinder 10 and the first chamber 20. The oilless shaft sealing device 50 with the lantern ring A and the lantern ring B interposed is provided on the lantern ring B.
A gas 81 which does not interfere with the compressed gas and is higher than the suction pressure is enclosed, and the gas leaking from the cylinder 10 to the first chamber 20 through the lantern ring A and the gas enclosed in the lantern ring B are compressed. The first chamber 20 is connected to the purge tank 201 while being returned to the suction line 501, and
An oilless shaft seal device 60 having a lantern ring C and a lantern ring D interposed is provided between the chamber 20 and the second chamber 30, and an inert gas 91 slightly higher than the pressure in the first chamber 20 is provided in the lantern ring C. The gas 81 leaked into the first chamber 20 after being enclosed in the lantern ring B and the first chamber from the second chamber 30
The gas 91 leaked to the chamber 20 is collected in the purge tank 201, sealed in the lantern ring C via the lantern ring D, and the gas 91 leaked to the second chamber 30 is collected in the recovery tank 302.
A reciprocating gas compressor equipped with a gas leakage treatment device for a shaft seal portion, which is characterized in that it can be recovered.