JP2000240575A - Oil-cooled air compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-cooled air compressor capable of continuously sending the clean compressed air to an user side, preventing the contamination by metallic salt in the lubricant, and keeping the superior lubricant separating and recovering performance in an oil separating and recovering device. SOLUTION: This air compressor 1 sucks air in a suction passage 12 passed through a suction filter 11, into a compressor body 14 through an intake control valve 13, compresses the air while receiving the lubricant, delivers the compressed air with the lubricant to a delivery passage 16 from the compressor body 14, separates the compressed air from the lubricant by an oil separating and recovering unit disposed on the discharge passage 16 and sends, the compressed air after the separation from the oil separating and recovering unit 18, and repeatedly uses the recovered lubricant by recirculating it. On this occasion, an acidic gas removing layer made of an acidic gas adsorbing member and capable of passing the air flowing into the suction passage 12 therethrough, is mounted at a primary side of the intake control valve 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-cooled air compressor for compressing air while injecting lubricating oil.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, air in a suction passage 12 passed through a suction filter 11 is sucked into a compressor body 14 through an intake control valve 13, and an oil supply passage 15 while injecting lubricating oil and compressing,
An oil-cooled air compressor 10 that discharges compressed air together with lubricating oil to a discharge flow path 16 is known. An oil separation / collection device 18 containing an oil separation element 17 for gas-liquid separation is interposed in the discharge channel 16, and compressed air with lubricating oil is separated by the oil separation element 17. From the compressed air from which the lubricating oil has been separated.
From the discharge flow path 16 extending upward to the user via a check valve 19. On the other hand, the lubricating oil separated from the compressed air is temporarily stored in an oil sump 20 at the lower part of the oil separator / collector 18, and the oil cooler 21
And a lubricating oil supply point such as an air compression space, a bearing and a shaft seal portion in the compressor body 14 through an oil supply passage 15 provided with an oil filter 22 interposed therebetween, and the lubricating oil is repeatedly circulated for use. It has become.

[0003]

In recent years, the air sucked by the oil-cooled air compressor 10 described above often contains an acid gas, for example, a sulfurous acid gas. Further, the air compressed by the compressor body 14 precipitates water in the oil separation and recovery device 18, and when the compressed air in the oil separation and recovery device 18 contains an acidic gas, an acid liquid is generated. . On the other hand, in general, zinc is often used for piping parts and iron parts such as the inner surface of the housing of the oil filter 22 for rust prevention. Further, copper is used for the piping itself and a valve body (not shown) in the intake control valve 13. For this reason, these components react with the above-mentioned acidic liquid, and fine metal salt stains occur in the lubricating oil. For example, when sulfur dioxide gas and water react, sulfuric acid is generated, and when the sulfuric acid reacts with zinc or copper, metal sulfate is generated.

[0004] Lubricating oil contaminated with the metal salt accompanying the compressed air accumulates in the oil separating element 17 and causes the oil separating element 17 to be clogged. When this clogging occurs, the compressed air becomes difficult to flow, and the flow velocity of the compressed air passing through the oil separation element 17 locally increases, so that the oil separation function of the oil separation element 17 decreases. As a result, compressed air in which the lubricating oil has not been sufficiently separated is sent to the user side, causing damage.
Further, the lubricating oil in the oil-cooled air compressor 10 decreases,
There is a problem that poor lubrication may occur at the lubricating oil supply point, which may cause an emergency stop due to an abnormal temperature rise, or a situation where fatal damage such as bearing damage or breakage occurs. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described conventional problems, and continues to send clean compressed air to a user side, prevent generation of metal salt contamination in lubricating oil, and prevent oil separation. An object of the present invention is to provide an oil-cooled air compressor capable of maintaining good lubricating oil separation and recovery performance in a recovery device.

[0005]

In order to solve the above-mentioned problems, the present invention suctions air in a suction flow passage passed through a suction filter into a compressor main body through an intake control valve, and lubricates the air therein. Compressed while receiving oil injection, discharge compressed air together with lubricating oil from the compressor body to the discharge flow path, and separate the compressed air and lubricating oil with the oil separation and recovery device interposed in the discharge flow path In the oil-cooled air compressor that uses the separated lubricating oil repeatedly circulated while sending the compressed air after separation from the oil separation and recovery unit, the primary side of the intake control valve is
An acid gas removal layer was provided, which was made of an acid gas adsorption member, and through which air flowing into the suction flow path passed.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show an oil-cooled air compressor 1 according to the present invention, and the oil-cooled air compressor 1 shown in FIG.
Portions common to 0 are denoted by the same reference numerals and description thereof is omitted. The oil-cooled air compressor 1 is provided with an acidic gas removing layer 2 made of an acidic gas adsorbing member, for example, activated carbon, which surrounds an outer peripheral portion of the suction filter 11 and allows the air flowing into the suction channel 12 to pass therethrough. It was formed. In the process in which the air flowing into the suction passage 12 passes through the acidic gas removing layer 2, the acidic gas contained in the air is removed to prevent acidification of water precipitated from the compressed gas. Accordingly, the occurrence of contamination of the metal salt in the lubricating oil is prevented, and the oil separating element 17 is hardly clogged. As a result, a good lubricating oil separation / collection function in the oil separation / collection unit 18 is maintained, and it is possible to continue sending clean compressed air to the user side. Also,
The possibility of developing an emergency stop due to an abnormal rise in temperature due to insufficient lubricating oil, or a situation in which catastrophic damage such as bearing damage or breakage accident occurs, is reduced.

As shown in FIG. 2, the intake control valve 13 has a valve element 31 for opening and closing the suction passage 12, and this valve element 31 is always connected to a left valve seat 32 in FIG. It is biased toward. The valve body 31 is separated from the valve seat 32 by applying a force against the spring force to the valve body 31 by means (not shown), and the suction passage 1
2 is opened. The space indicated by A in FIG.
FIG. 2 shows a state at the time of partial load operation in which the space indicated by A and the space indicated by B communicate with each other, and the suction passage 12 is slightly opened.

The acid gas removal layer 2 is connected to the suction filter 1
1 has an advantage that the surface area through which air can pass can be increased and maintenance is facilitated. However, the present invention is not limited to this, and any one of the primary sides of the intake control valve 13 can be used. Acid gas removal layer 2 at some position
And an oil-cooled air compressor provided with

[0009]

As is apparent from the above description, according to the present invention, the air in the suction passage passed through the suction filter is sucked into the compressor body via the suction control valve, and the lubricating oil Compressed while receiving the injection of, the compressed air is discharged from the compressor body together with the lubricating oil into the discharge flow path, and the compressed air and the lubricating oil are separated by an oil separation and recovery device interposed in the discharge flow path, In the oil-cooled air compressor, in which the compressed air after separation is sent out from the oil separation and recovery unit and the collected lubricating oil is repeatedly circulated and used, on the primary side of the intake control valve, from the acidic gas adsorption member That is, a configuration is provided in which an acid gas removal layer that allows the air flowing into the suction passage to pass therethrough is provided.

Therefore, even if the atmosphere contains an acidic gas, the air from which the acidic gas has been removed is sucked into the primary side of the intake control valve, so that the acid that has precipitated from the compressed gas is acidified. It prevents contamination of the metal salt in the lubricating oil, and makes it difficult for the separation element in the oil separation and recovery unit to be clogged.As a result, it is possible to continue sending clean compressed air to the user side. Become. In addition, there is an effect that the possibility of developing an emergency stop due to an abnormal temperature rise due to dirt or decrease in lubricating oil or a situation of causing fatal damage such as bearing damage or breakage accident can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of an oil-cooled air compressor according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a portion from an intake filter to an intake control valve of the oil-cooled air compressor shown in FIG.

FIG. 3 is a diagram showing an entire configuration of a conventional oil-cooled air compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil-cooled air compressor 2 Acid gas removal layer 11 Suction filter 12 Suction flow path 13 Suction control valve 14 Compressor body 15 Oil supply flow path 16 Discharge flow path 18 Oil separation and recovery unit 20 Oil reservoir

Claims (1)

[Claims] 1. The air in a suction passage passed through a suction filter is sucked into a compressor main body through an intake control valve, where it is compressed while receiving lubricating oil, and discharged from the compressor main body. The compressed air and the lubricating oil are discharged together with the lubricating oil into the passage, and the compressed air and the lubricating oil are separated by the oil separating and collecting device interposed in the discharge passage, and the separated compressed air is sent out from the oil separating and collecting device. In an oil-cooled air compressor that uses the recovered lubricating oil by repeatedly circulating it, on the primary side of the intake control valve,
An oil-cooled air compressor comprising an acid gas adsorbing member and an acid gas removal layer for passing air flowing into the suction passage.