EP0314133B1 - Oil cooled fluid compression apparatus - Google Patents
Oil cooled fluid compression apparatus Download PDFInfo
- Publication number
- EP0314133B1 EP0314133B1 EP88117931A EP88117931A EP0314133B1 EP 0314133 B1 EP0314133 B1 EP 0314133B1 EP 88117931 A EP88117931 A EP 88117931A EP 88117931 A EP88117931 A EP 88117931A EP 0314133 B1 EP0314133 B1 EP 0314133B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- piping
- air
- oil separator
- compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
Definitions
- This invention relates to a fluid compressor, and more particularly to a safety device suitable for an oil cooled type air compressor.
- lubricating oil is supplied to the compression section.
- This lubricating oil which provides the double function of lubrication and sealing, cools the compressed air whose temperature has risen because of the heat of compression, and moves to an oil separator. After being separated from the compressed air by the oil separator, the lubricating oil is cooled by water or air and then supplied to the compression section again. As this cycle is repeated, the lubricating oil is deteriorated through oxidization due to the heat of compression. Part of the lubricating oil is carbonized and the thus carbonized components move to the oil separator with the lubricating oil.
- Japanese Patent Laid-Open No. 59-115493 discloses a device for detecting such spontaneous ignition.
- a detection member made of a material which fuses with heat is provided in an oil separating element of the oil separator, so that the ignition may be detected through the fusion of the detection member caused by the heat of ignition of the oil separating element.
- the above object is attained by connecting an auxiliary piping to a main piping which is connected to a secondary side section of the oil separator, and by providing in the auxiliary piping with a gas detector for detecting a gas which is generated, increased or decreased at an early stage of any burning in the oil separator, the gas detector outputting a signal for opening an emergency stop circuit of an operation control of the compression apparatus to effect an emergency stop thereof.
- the gas detector upon detecting the gas generated, increased or decreased by the burning in the oil separator, the gas detector generates a detection signal by means of which the compression apparatus is stopped.
- the invention is embodied as an oil cooled screw compressor system.
- the air serving as the working fluid is sucked by a compressor 7 through a suction throttle valve 6.
- the air is compressed in the compressor 7 to a predetermined pressure and is then discharged to an oil separator 8 through a piping 21.
- the oil separator 8 includes an element 9 which is adapted to separate an oil injected into the compressor during the compression process, from the compressed air.
- the material of this element 9 may be glass wool, for example.
- the air which has passed through this element 9, i.e. the air which is discharged from the oil separator 8, is delivered to a pressure regulator valve 10 which has a check valve and is provided in a main piping 22.
- the air which has passed through this pressure regulator valve 10 flows through the main piping 22 and is discharged as the supply air. Further, the air which has passed through this element 9 serves to control the throttle amount of the above-mentioned suction throttle valve 6 through the intermediary of an air discharge valve 11, thereby controlling the suction amount.
- An auxiliary piping 23 branches off the main piping 22 at a position on the downstream side of the pressure regurator valve 10. A part of the discharge air is supplied, as a sample, to this auxiliary piping 23 through a pressure reducing valve 12 or an orifice so that the gas detection may be effected.
- This sampling air for the gas detection is regulated to a certain flow rate and pressure by the pressure reducing valve 12 and is delivered to a sensor unit 13.
- the sensor unit 13 includes a filter 14, a gas detector 2, an electronic circuit 3, a relay contact 4, and an orifice 16. In this sensor unit 13, the above-mentioned air for the gas detection flows through the filter 14 to the gas detector 2.
- the gas detector 2 includes, for example, as shown in Fig.
- a container 15 which receives a CO gas sensor 1 and is sealed by means of an O-ring 30.
- the discharge air for sampling is supplied in the container through an inlet 31.
- the CO gas sensor 1 is arranged in the flow of the discharge air such that a CO gas density in the air flow may be detected with high accuracy. After the gas detection, the air flows out through an outlet 32 and is discharged in the atmosphere through the orifice 16 as shown in Fig. 1.
- the CO gas sensor 1 is of a thermal conduction type which detects any change in its thermal and electrical conduction due to the absorption of gas as a change in its resistance and transforms the detected change into an electric signal by means of the electronic circuit 3.
- the sensor then operates the relay contact 4 of the sensor unit, which contact is arranged in the operation circuit of a starting unit 5 provided for controlling the operation of the compressor.
- the starting unit 5 includes a relay 88 for operating the compressor 7, an activating contact BS and a stopping contact BSS for the compressor 7 as well as a normally opened contact 88a of the relay 88, the above-mentioned relay contact 4 being connected in series to the relay 88.
- the relay contact 4 which is normally ON is turned OFF, thereby cutting off the operation circuit.
- the CO gas sensor 1 is of a type which can be used under pressure, it may be arranged directly in the main piping 22 on the outlet side of the pressure regulator valve 10.
- the system may be constructed as shown in Fig. 3, wherein an orifice 24 and the detector 2 are arranged in the branch piping 23 for detecting gas, and a plate 17 is fixed to the container of the gas detector by means of screws for securing the CO gas sensor 1 so that the sensor may withstand the pressure of the discharge gas.
- the air is returned to the suction inlet of the compressor 7 through a return piping 25 so that pressure differential may be developed across the sensor unit, or to the main piping 22 for the compressed air through a return piping 26.
- This arrangement enables a constant amount of air to flow through the gas detector 2, thereby performing the detection of CO gas.
- the sensor unit cuts off operation circuit of the starting unit for the compressor in the same manner as described with reference to the embodiment shown in Fig. 1.
- any ignition or combustion can be detected within one minute after its occurring, so that the compressor can be stopped before smoke and flames are generated.
- a conventional temperature sensor it takes about three and half minutes at the earliest to detect such ignition, and the burning would be developed to a considerable degree.
- the safety device according to this invention can be installed in any compressor system solely by providing a branch piping on the secondary side of the oil separator. Accordingly, it is easy to apply the invention to a compressor which has already been in practical work. Additionally, since no conventional temperature sensor has to be provided, the reliability of the device can be improved.
- the gas sensor involves no erroneous operation due to loading and unloading, so that a high accuracy in detection and a long service life of the device are ensured.
- the device may also be used as a sensor for detecting oil deterioration as well as for detecting time for replacing the element of the oil separator with a new one. Consequently, the device will contribute much in improving the reliability of devices of this kind and developing a maintenance-free system for the future.
- the above-described embodiments of this invention make it possible to detect any burning or combustion of the element in the oil separator more quickly than any other temperature sensor, thereby eliminating one of the factors causing a fire. Further, since the safety device according to the invention can also serve as an alarm for oil deterioration and element replacement, the device may find its use as a highly reliable maintenance device.
- the present invention makes it possible to detect any ignition or burning in the oil separator at an early stage and to effect an emergency stop of the fluid compressor, thereby avoiding a secondary ignition in other sections of the system.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Compressor (AREA)
Description
- This invention relates to a fluid compressor, and more particularly to a safety device suitable for an oil cooled type air compressor.
- In an oil cooled type air compressor, for example an oil cooled screw compressor, lubricating oil is supplied to the compression section. This lubricating oil, which provides the double function of lubrication and sealing, cools the compressed air whose temperature has risen because of the heat of compression, and moves to an oil separator. After being separated from the compressed air by the oil separator, the lubricating oil is cooled by water or air and then supplied to the compression section again. As this cycle is repeated, the lubricating oil is deteriorated through oxidization due to the heat of compression. Part of the lubricating oil is carbonized and the thus carbonized components move to the oil separator with the lubricating oil. The carbon components are then separated from the lubricating oil and accumulate on a filter of the oil separator. The accumulation amount of the carbon components gradually increases when the compressor is used for a long period of time, which may spontaneously ignite owing to the heat of compression under the effect of thermal accumulation of the carbon. Japanese Patent Laid-Open No. 59-115493, for example, discloses a device for detecting such spontaneous ignition. In this device, a detection member made of a material which fuses with heat is provided in an oil separating element of the oil separator, so that the ignition may be detected through the fusion of the detection member caused by the heat of ignition of the oil separating element.
- Thus, in the prior art, a secondary or resultant temperature rise after the combustion of the carbon is sensed by means of a temperature detector, so that the ignition is detected only after the combustion has advanced to a considerable degree. Accordingly, no consideration is given to a danger of other sections catching fire through extension of the combustion, the prevention of such ignition from occurring or the extinction thereof at an early stage. Further, since the temperature sensing is made under the pressure of the compressed fluid, the detection end of the detector has to be covered by a protection tube, which involves the problem of low responsiveness in detection.
- Accordingly, it is an object of this invention to make it possible to detect any burning or combustion in the oil separator of an oil cooled compression apparatus at an early stage and to effect an emergency stop of the compression apparatus for fluid so that the flow of fluid therein may be stopped to extinguish the fire as soon as possible and avoid any secondary ignition.
- The above object is attained by connecting an auxiliary piping to a main piping which is connected to a secondary side section of the oil separator, and by providing in the auxiliary piping with a gas detector for detecting a gas which is generated, increased or decreased at an early stage of any burning in the oil separator, the gas detector outputting a signal for opening an emergency stop circuit of an operation control of the compression apparatus to effect an emergency stop thereof.
- Thus, upon detecting the gas generated, increased or decreased by the burning in the oil separator, the gas detector generates a detection signal by means of which the compression apparatus is stopped.
- Fig. 1 is a schematic diagram illustrating the compression system according to an embodiment of this invention;
- Fig. 2 is a sectional view showing in detail a gas detector which is used in the system shown in Fig. 1; and
- Fig. 3 is a schematic diagram illustrating the compression system according to another embodiment of this invention.
- An embodiment of this invention will now be described with reference to Figs. 1 and 2. In this case, the invention is embodied as an oil cooled screw compressor system. The air serving as the working fluid is sucked by a
compressor 7 through asuction throttle valve 6. The air is compressed in thecompressor 7 to a predetermined pressure and is then discharged to anoil separator 8 through apiping 21. Theoil separator 8 includes anelement 9 which is adapted to separate an oil injected into the compressor during the compression process, from the compressed air. The material of thiselement 9 may be glass wool, for example. The air which has passed through thiselement 9, i.e. the air which is discharged from theoil separator 8, is delivered to apressure regulator valve 10 which has a check valve and is provided in amain piping 22. The air which has passed through thispressure regulator valve 10 flows through themain piping 22 and is discharged as the supply air. Further, the air which has passed through thiselement 9 serves to control the throttle amount of the above-mentionedsuction throttle valve 6 through the intermediary of an air discharge valve 11, thereby controlling the suction amount. - An
auxiliary piping 23 branches off themain piping 22 at a position on the downstream side of thepressure regurator valve 10. A part of the discharge air is supplied, as a sample, to thisauxiliary piping 23 through apressure reducing valve 12 or an orifice so that the gas detection may be effected. This sampling air for the gas detection is regulated to a certain flow rate and pressure by thepressure reducing valve 12 and is delivered to asensor unit 13. Thesensor unit 13 includes afilter 14, agas detector 2, an electronic circuit 3, arelay contact 4, and an orifice 16. In thissensor unit 13, the above-mentioned air for the gas detection flows through thefilter 14 to thegas detector 2. Thegas detector 2 includes, for example, as shown in Fig. 2, acontainer 15 which receives a CO gas sensor 1 and is sealed by means of an O-ring 30. The discharge air for sampling is supplied in the container through aninlet 31. The CO gas sensor 1 is arranged in the flow of the discharge air such that a CO gas density in the air flow may be detected with high accuracy. After the gas detection, the air flows out through anoutlet 32 and is discharged in the atmosphere through the orifice 16 as shown in Fig. 1. The CO gas sensor 1 is of a thermal conduction type which detects any change in its thermal and electrical conduction due to the absorption of gas as a change in its resistance and transforms the detected change into an electric signal by means of the electronic circuit 3. The sensor then operates therelay contact 4 of the sensor unit, which contact is arranged in the operation circuit of astarting unit 5 provided for controlling the operation of the compressor. Thestarting unit 5 includes arelay 88 for operating thecompressor 7, an activating contact BS and a stopping contact BSS for thecompressor 7 as well as a normally openedcontact 88a of therelay 88, the above-mentionedrelay contact 4 being connected in series to therelay 88. When, for example, the CO gas density in the air exceeds several hundred ppm, therelay contact 4 which is normally ON is turned OFF, thereby cutting off the operation circuit. If the CO gas sensor 1 is of a type which can be used under pressure, it may be arranged directly in themain piping 22 on the outlet side of thepressure regulator valve 10. Alternatively, the system may be constructed as shown in Fig. 3, wherein anorifice 24 and thedetector 2 are arranged in thebranch piping 23 for detecting gas, and aplate 17 is fixed to the container of the gas detector by means of screws for securing the CO gas sensor 1 so that the sensor may withstand the pressure of the discharge gas. After the gas detection, the air is returned to the suction inlet of thecompressor 7 through areturn piping 25 so that pressure differential may be developed across the sensor unit, or to themain piping 22 for the compressed air through areturn piping 26. This arrangement enables a constant amount of air to flow through thegas detector 2, thereby performing the detection of CO gas. In this embodiment, the sensor unit cuts off operation circuit of the starting unit for the compressor in the same manner as described with reference to the embodiment shown in Fig. 1. - In the embodiments described above, any ignition or combustion can be detected within one minute after its occurring, so that the compressor can be stopped before smoke and flames are generated. With a conventional temperature sensor, it takes about three and half minutes at the earliest to detect such ignition, and the burning would be developed to a considerable degree. The safety device according to this invention can be installed in any compressor system solely by providing a branch piping on the secondary side of the oil separator. Accordingly, it is easy to apply the invention to a compressor which has already been in practical work. Additionally, since no conventional temperature sensor has to be provided, the reliability of the device can be improved. Furthermore, as the CO gas detection is performed with a constant air flow rate, the gas sensor involves no erroneous operation due to loading and unloading, so that a high accuracy in detection and a long service life of the device are ensured. The device may also be used as a sensor for detecting oil deterioration as well as for detecting time for replacing the element of the oil separator with a new one. Consequently, the device will contribute much in improving the reliability of devices of this kind and developing a maintenance-free system for the future.
- Thus, the above-described embodiments of this invention make it possible to detect any burning or combustion of the element in the oil separator more quickly than any other temperature sensor, thereby eliminating one of the factors causing a fire. Further, since the safety device according to the invention can also serve as an alarm for oil deterioration and element replacement, the device may find its use as a highly reliable maintenance device.
- As described above, the present invention makes it possible to detect any ignition or burning in the oil separator at an early stage and to effect an emergency stop of the fluid compressor, thereby avoiding a secondary ignition in other sections of the system.
Claims (5)
- An oil cooled fluid compression apparatus comprising fluid compressor means (7) for compressing a working fluid sucked therein through an inlet to a predetermined pressure and discharging the compressed working fluid through an outlet, oil separator means (8) for separating oil injected into said compressor means (7) during compression process from the compressed working fluid, main piping means (22) for communicating said oil separator means (8) with a compressed fluid service end, characterized by auxiliary piping means (23) branching off said main piping means (22), and a sensor unit (13) provided in said auxiliary piping means (23) for detecting the density of a gas in the working fluid which density changes when burning takes place in said oil separator means (8) and stopping said compressor means (7) upon detection of change in the gas.
- An apparatus according to claim 1, characterized in that said auxiliary piping means (23) communicate with either a suction side of said compressor means (7) or a portion of said main piping means (22) which is closer to said compressed fluid service end than the portion of said main piping means (22) at which said auxiliary piping (23) branches off.
- Apparatus according to claim 1 or 2, characterized in that the safety device on the discharge side of the oil separator (8) comprises gas detector means (2) for detecting the density of a gas which density changes when burning takes place in said oil separator (8), circuit means (3) for transforming a detection signal of said gas detector means (2) into an electric signal, and control means (5) for controlling driving and stopping of said compression means (7) in accordance with an output signal of said circuit means (3).
- An apparatus according to one of the claims 1 to 3, characterized in that the working fluid is air and in that the sensor unit (13) is provided in said auxiliary piping means (23) for detecting CO gas produced in the compressed air when burning takes place in said oil separator means (8) and stopping said compressor means (7) upon detection of the CO gas.
- Apparatus according to claim 4, characterized in that the CO gas detecting device arranged in a piping (23) for detecting a density of CO gas in air flowing through the piping (23) comprises a container (15) having an air inlet (31) and an air outlet (32), and a CO gas sensor (1) airtightly arranged in said container (15), the air inlet (31) and the air outlet (32) of said container (15) and said CO gas sensor (1) being arranged in such a manner that said CO gas sensor (1) is positioned in an air flow in the piping (23).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62270173A JP2728409B2 (en) | 1987-10-28 | 1987-10-28 | Oil-cooled screw compression device |
JP270173/87 | 1987-10-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0314133A2 EP0314133A2 (en) | 1989-05-03 |
EP0314133A3 EP0314133A3 (en) | 1990-01-03 |
EP0314133B1 true EP0314133B1 (en) | 1992-02-26 |
Family
ID=17482546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88117931A Expired - Lifetime EP0314133B1 (en) | 1987-10-28 | 1988-10-27 | Oil cooled fluid compression apparatus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0314133B1 (en) |
JP (1) | JP2728409B2 (en) |
KR (1) | KR930006376B1 (en) |
DE (1) | DE3868586D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8105051B2 (en) | 2004-06-18 | 2012-01-31 | Edwards Limited | Vacuum pump |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005033519A1 (en) * | 2003-10-01 | 2005-04-14 | City University | Plural screw positive displacement machines |
DE102005010690B4 (en) * | 2005-03-09 | 2007-04-12 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Oil-injected compressor with temperature switch |
US9856866B2 (en) | 2011-01-28 | 2018-01-02 | Wabtec Holding Corp. | Oil-free air compressor for rail vehicles |
KR102533332B1 (en) * | 2017-12-29 | 2023-05-17 | 대우조선해양 주식회사 | Lubricating Oil Sampling System and Method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB643495A (en) * | 1939-03-28 | 1950-09-20 | Airseco S A R L | Means for indicating or preventing overheating of the mixture of air and oil vapours in an air compressor |
JPS5535899A (en) * | 1978-09-05 | 1980-03-13 | Honeywell Inc | Combustion efficiency control system |
JPS55146906U (en) * | 1979-04-10 | 1980-10-22 | ||
JPS5542198U (en) * | 1979-06-28 | 1980-03-18 | ||
JPS59115493A (en) * | 1982-12-22 | 1984-07-03 | Hitachi Ltd | Ignition detector for oil separator element of screw hydraulic machine |
-
1987
- 1987-10-28 JP JP62270173A patent/JP2728409B2/en not_active Expired - Lifetime
-
1988
- 1988-10-12 KR KR1019880013293A patent/KR930006376B1/en not_active IP Right Cessation
- 1988-10-27 EP EP88117931A patent/EP0314133B1/en not_active Expired - Lifetime
- 1988-10-27 DE DE8888117931T patent/DE3868586D1/en not_active Expired - Lifetime
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN, vol 8. no. 238 (M-335)(1675), 31st October 1984 * |
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 230(M-333)(1667), 23rd October 1984 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8105051B2 (en) | 2004-06-18 | 2012-01-31 | Edwards Limited | Vacuum pump |
Also Published As
Publication number | Publication date |
---|---|
EP0314133A2 (en) | 1989-05-03 |
EP0314133A3 (en) | 1990-01-03 |
DE3868586D1 (en) | 1992-04-02 |
JPH01113586A (en) | 1989-05-02 |
KR930006376B1 (en) | 1993-07-14 |
KR890006978A (en) | 1989-06-17 |
JP2728409B2 (en) | 1998-03-18 |
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