KR930006376B1 - Oil injection compressor - Google Patents

Abstract

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Description

Oil-cooled fluid compressor

1 is a schematic diagram illustrating an embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining details of the gas detection means in FIG.

3 is a schematic diagram illustrating another example of the present invention.

* Explanation of symbols for main parts of the drawings

1: CO gas sensor 2: Gas detection means

3: electronic circuit 4: relay contact

5: Starter panel 6: Suction throttle valve

7 compressor 8 oil separation device

9: Element 10: Pressure regulating valve

11 gas discharge valve 12 pressure reducing valve

13 sensor unit 14 filter

15: container 16, 24: orifice

17: plate 21: piping

22: main pipe 23: auxiliary valve

31: O-ring 32: entrance

88: relay for operation

The present invention relates to a fluid compressor, and more particularly to a security device suitable for an oil-cooled air compressor.

As oil-cooled air compressors, for example, oil-cooled screw compressors are supplied with lubricating oil in the compression section. This lubricating oil performs the role of lubrication and seal, and at the same time, takes away the heat of compressed air whose temperature has risen by the heat of compression, and performs the oil separation device. The lubricating oil separated from the compressed air in the oil separator is cooled by water or air and then supplied to the compression unit again. In this process, the lubricating oil is oxidized by the heat of compression, and part of the lubricant is sent to the oil separator with the carbonized door lubricant, but when the oil is separated, the carbon in the oil is also separated, and this carbon is the filter of the oil separator. To be deposited. If it is used for a long time, the amount of carbon deposition increases and the heat storage action of the carbon is also applied, which may spontaneously ignite in the oil separation device. As a device for detecting such ignition, for example, as described in Japanese Patent Application Laid-Open No. 59-115493, an oil separation element of an oil separation device is provided with a detection agent formed of a material that is melted by heat. When ignition occurs, the detector detects utterance by recording by the heat.

In this conventional technique, since the secondary temperature rise after combustion is detected by the temperature detector, if the combustion does not proceed, the temperature does not rise, the combustion is enlarged, it is burned elsewhere, the combustion is prevented or the fire is extinguished early. It is not considered about. In addition, since temperature is detected in the presence of pressure, the detection stage has a problem in response to detection with a protective tube.

An object of the present invention is to detect the combustion early in the oil separation device to emergency stop the fluid compressor and stop the flow of air to extinguish prematurely, and to prevent secondary ignition elsewhere.

The object is to connect an auxiliary pipe to a main pipe connected to the secondary side of the oil separation device, and to provide a gas detection means for detecting gas generated or increasing or decreased in the initial stage of combustion of the oil separation device in the middle of the auxiliary pipe. This is accomplished by opening the emergency stop circuit of the gas detection means to emergency stop the compressor.

The gas detection means detects the gas generated by the combustion of the oil separation element in the oil separation device or the gas increased or decreased by the combustion, and generates a detection signal, and stops the compressor by this detection signal.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

This embodiment is applied to an oil-cooled screw compressor. Air, which is the working fluid sucked into the compressor 7 via the suction throttle valve 6, is compressed here to a predetermined pressure and enters the oil separator 8 through the pipe 21. The oil separation device 8 has a built-in element 9 for separating compressed air and oil injected during compression. The material which comprises this element 9 is glass fiber, etc., for example. The air passing through this element 9, that is, the air discharged from the oil separation device 8, is sent to the pressure regulating valve 10 with the check valve provided in the main pipe 22. Air passing through the pressure regulating valve 10 with the check valve is supplied as supply air via the main pipe 22. In addition, the air passing through the element 9 controls the throttle amount of the suction throttle valve 6 via the gas discharge valve 11 to control the suction amount.

On the downstream side of the pressure regulating valve 10 with the check valve of the main pipe 22, an auxiliary pipe 23 is branched, and the auxiliary pipe 23 is used for gas detection via a pressure reducing valve 12 or an orifice. Sampling air is supplied. The sampled air for gas detection is controlled at a constant flow rate and a constant pressure by the pressure reducing valve 12 and sent to the sensor unit 13. The sensor unit 13 is provided with a filter 14, a gas detection means 2, an electronic circuit 3, a relay contact 4, and an orifice 6. In the sensor unit 13, the detection air flows to the gas detecting means 2 via the filter 14. For example, as shown in FIG. 2, the gas detection means 2 houses the CO gas sensor 1 in the container 15 and is sealed by the O-ring 31. As shown in FIG. The discharge gas for sampling is supplied from the inlet 32. The CO gas sensor 1 is disposed in the flow so as to detect the CO gas concentration at a constant meat flow rate with high accuracy, and the air after the detection flows out of the outlet 32 and passes through the orifice 16 shown in FIG. Emitted to the atmosphere. The CO gas sensor 1 is of a heat conduction type, which captures heat transfer change and electric conduction change due to gas adsorption as resistance change, converts it into an electrical signal by the electronic circuit 3, and starts as a control means of the compressor 7. The compressor is controlled by operating the relay contact 4 of the sensor unit wired to the operation circuit of the van 5.

The starter panel 5 includes an operation relay 88 of the compressor 7, a starting contact BS of the compressor 7, a stop contact BSS, and an upper contact 88a of the relay 88. The reel contact is inserted in series with the relay 88. For example, when the concentration of CO gas in the air reaches more than 100 ppm, the relay contact 4, which is normally on, is turned off to cut the operation circuit. In the case of the CO gas sensor which can be used under pressure, the sensor 1 may be disposed in the main pipe 22 on the outlet side of the pressure regulating valve 10 with a direct check valve. In addition, as shown in FIG. 3, an orifice 24 and a detection means 2 are arranged in the auxiliary pipe 23 branched for gas detection, and the plate 17 for pressing the CO gas sensor 1 to withstand the pressure. Install and fix with screws.

Then, the detected air is returned to the inlet port of the compressor 7 via the return pipe 25 or the return pipe 26 to the main pipe 22 for the supply air so as to generate a pressure difference. Thereby, constant air flows into the gas detection means 2, and CO gas can be detected. Also in this case, the control section cuts the operation circuit by the method described in FIG.

According to the embodiment described above, the compressor can be stopped before smoke or flames can be detected because the abnormality can be detected within about one minute after combustion occurs. In conventional temperature detectors, at least about three minutes and thirty seconds, combustion proceeds significantly. Since installation can be applied to all compressors by drawing out pipes from the secondary side of the oil separation device, retrofitting is easily performed in the case of already delivered machines and the like. Moreover, the installation of the conventional temperature detector becomes unnecessary and the reliability is improved. In addition, since the CO gas sensor is detected at a constant flow rate, there is no malfunction due to the load 10ad and the unload, and the accuracy and the service life are improved. The scope of application also extends to oil deterioration sensors and urea replacement timing sensors, which is a function of maintenance without maintenance.

As described above, according to the present embodiment, the combustion of the elements in the oil separation device can be detected faster than any temperature detector, so that the cause of fire can be eliminated. In addition, when maintenance is insufficient, it can be used as an alarm for lubrication deterioration and an element replacement alarm. Therefore, it is effective as a detection method with high reliability because of its high reliability as a security device.

As described above, according to the present invention, the combustion in the oil separation device can be detected early and the fluid pressure side device can be emergency stopped to prevent secondary softening to other places.

Claims (2)

A fluid compressor for compressing the working fluid sucked from the suction port to a predetermined pressure and discharging it from the discharge part; An oil separator for separating the lubricating oil and the compressed fluid injected during the compression of the compressor; A main pipe communicating with the oil separation device and the pressurized fluid supply side, the auxiliary pipe is branched and installed in the main pipe, a sensor unit is disposed in the auxiliary pipe, and the sensor unit is generated during combustion of the oil separation device. Or stop the operation of the compressor upon detecting a decreasing gas. A compressor which compresses the working air sucked from the suction port to a predetermined pressure and discharges it from the discharge section; An oil separator for separating the lubricating oil and compressed air injected during the compression process of the compressor; A main pipe communicating with the oil separator and the compressed air supply side, and branching the auxiliary pipe to the member pipe to install a sensor unit in the auxiliary pipe, wherein the sensor unit is burned in the oil separation device. An oil-cooled fluid compression device, characterized in that configured to stop the operation of the compressor when detecting the generated CO gas.

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