JPH07189970A - Ignition spread preventing wire net for oil-cooled screw compressor - Google Patents

Abstract

PURPOSE:To shut off flames generated from the respective intake-exhaust ports of various valves so as to prevent the flames from spreading to combustibles in the vicinity by disposing wire nets at the respective intake-exhaust ports of these valves in the case of lubricating oil being self-ignited to burn in an oil separator. CONSTITUTION:In an oil-cooled screw compressor, air is compressed being led into a compressor 1 through a throttle valve 6, and during this time, oil is fed for sealing, cooling and lubrication. Compressed air discharged to an oil separator 3 is cooled by an after-cooler 5 after oil in the mist state is collected by an separating element 9, and discharged. There is a case of oil being self-ignited in association with use with the lapse of time so as to burn in the oil separator 3. As a result, flames are generated from the respective intake- exhaust ports of the throttle valve 6, a solenoid valve 7 and a safety valve 8 and spread to combustibles in the vicinity. In order to cope with this, a wire net 12 is disposed at each intake port. The flames are thereby shut off to prevent fine spread.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-cooled screw compressor, and in particular, prevents the flame from the intake and exhaust ports in the compressor unit during combustion in the oil separator to prevent the spread of flame in the compressor unit. A wire net for preventing ignition and spread of an oil-cooled screw compressor suitable for

[0002]

2. Description of the Related Art FIG. 5 is an overall flow chart of an oil-cooled screw compressor. Air passes through the suction throttle valve 6 and the compressor 1
And is compressed to a predetermined pressure, but on the way, oil is supplied for sealing, cooling, and lubrication to contain oil,
It is discharged to the oil separator 3. Oil separator 3
In the compressed air discharged to, the mist-state oil is collected by the separation element 9, cooled by the after cooler 5, and discharged.

The lubricating oil in the oil-cooled screw compressor is repeatedly heated and cooled, and is oxidized when used for a long time, and the heat of oxidation is accumulated inside the separation element 9,
There is a case where the temperature rises to the ignition temperature of the carbide generated inside to cause spontaneous ignition and combustion in the oil separator 3.

During combustion in the oil separator 3, the temperature inside the oil separator 3 rises to a high temperature of about 1200.degree.
In addition, a high pressure state is generated, and a flame is generated from the intake / exhaust ports of the safety valve 8, the solenoid valve 7, and the suction throttle valve 6, and the flammable substances in the vicinity are spread. Conventionally, such flammable materials are replaced by expensive flame-retardant or non-flammable materials, or the flammable materials are protected by these flame-retardant or non-flammable materials to spread the fire. Had been prevented. Japanese Patent Application Laid-Open No. 3-130595 has been proposed as a related item.

[0005]

SUMMARY OF THE INVENTION The above-mentioned conventional technique is such that the safety valve 8 by the combustion in the oil separator 3, the solenoid valve 7,
The fact is that there is no method of extinguishing the flame from the intake / exhaust port of the suction throttle valve 6, and no consideration has been given to extinguishing or preventing the spread of fire.

The present invention has been made in view of the above problems of the prior art.
A wire net for preventing the spread of fire in an oil-cooled screw compressor that can maintain the functions of the safety valve, solenoid valve, and suction throttle valve in the oil-cooled screw compressor, and that can block the flame from these intake and exhaust ports. The purpose is to provide.

[0007]

In order to achieve the above object, the present invention provides an oil-cooled screw compressor having various devices such as a safety valve for exhausting air into a compressor unit, a solenoid valve for intake / exhaust, and a suction throttle valve. In order to prevent the spread of fire in the compressor unit due to combustion in the oil separator, the functions of the safety valve, the electromagnetic valve, and the suction throttle valve are maintained, and the flame from the intake and exhaust ports is shut off.

[0008]

With the above structure, the flame ejected from the intake and exhaust ports radiates heat to the wire net, and the heat of the wire net is radiated to lower the flame temperature. For this reason,
Even if a flame is ejected, the function of each device can be maintained by the flame, and at the same time, the flame will not be ejected from the device over the wire net to the outside thereof.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a diagram in which a wire net is attached to a safety valve, FIG. 2 is a diagram in which a wire net is attached to a pipe end connected to a solenoid valve, FIG. 3 is a diagram in which a wire net is attached to a suction throttle valve, and FIG. 4 is a wire It is a conceptual diagram of flame interception by a net.

In FIG. 4, when a flame is ejected from the intake / exhaust port 20 in the flame generation temperature state, a heat quantity Q ₁ is generated inside the wire net 12 covering the outlet of the intake / exhaust port 20. However, the heat absorption coefficient α ₁ of the wire net 12,
Due to the thermal emissivity α _2, etc., the heat quantity Q ₁ is reduced to the heat quantity Q _{2 in the} extinction temperature state. Therefore, it is possible to prevent the flame from being ejected to the outside of the wire net 12. Here, Q ₂ = Q ₁ / α ₁ · α ₂ , and the heat absorption rate α ₁ and the heat emissivity α ₂
Is determined by the material and surface area of the wire net 12. As the material of the wire net 12, copper, SUS, or the like is used, and the wire net 12 is configured to have 50 to 100 mesh.

In FIG. 1, reference numeral 8 is a safety valve, and the arrows shown in the drawing show the flow of flame ejection. The wire net 12 is formed so as to completely cover the safety valve 8 from above, and has a cylindrical shape with a thickness of 50 mm, for example, and the upper surface is attached to the safety valve 8 via a mounting plate 12a with bolts. Now, when a flame of high pressure / high temperature, for example, 1200 ° C. is ejected from the inside of the safety valve 8 into the wire net 12, the heat quantity of the flame is absorbed by the wire net 12 at the same time as described in FIG. As a result, the heat quantity is reduced to the extinction temperature state, and the flame can be shut off without impairing the function of the safety valve 8.

In FIG. 2, 13 is a wire net having the same structure as the wire net shown in FIG. 1, and the wire net 13 is attached to the end of a copper pipe 14 connected to the solenoid valve 7. . The flame ejected from the solenoid valve 7 reaches the wire net 13 through the pipe 14, but during that time, the flame is cooled while passing through the pipe 14 and further radiated by the wire net 13. Therefore, as in the case of FIG. The heat quantity of the flame can be reduced to the heat quantity in the extinction temperature state, and the flame can be shut off without impairing the function of the solenoid valve 7.

In FIG. 3, reference numeral 15 is a wire net formed in conformity with the shape of the suction throttle valve 6, the material of which is
The mesh, thickness and the like are the same as those in FIGS. 1 and 2.
When the flame flows at high pressure and high temperature in the direction indicated by the arrow in the figure, the heat quantity of the flame is reduced to the heat quantity at the extinction temperature state as in the case of FIGS. 1 and 2, and the flame is not impaired without impairing the function of the suction throttle valve 6. Can be shut off.

[0014]

As described above, according to the present invention, the functions of the safety valve, the solenoid valve, and the suction throttle valve in the oil-cooled screw compressor can be maintained and the flames from these intake and exhaust ports can be shut off. Produce an effect.

[Brief description of drawings]

FIG. 1 is a view in which a wire net is attached to a safety valve in an embodiment of the present invention.

FIG. 2 is a view in which a wire net is attached to an end of a pipe connected to a solenoid valve in the embodiment of the present invention.

FIG. 3 is a view in which the wire net is attached to the suction throttle valve in the embodiment of the present invention.

FIG. 4 is a conceptual diagram of flame shutoff by the wire net of the present invention.

FIG. 5 is an overall flow diagram of a conventional oil-cooled screw compressor.

[Explanation of symbols]

1 ... Compressor, 3 ... Oil separator, 4 ... Oil cooler, 6 ... Suction throttle valve, 7, 10 ... Solenoid valve, 8 ... Safety valve, 11 ... Oil strainer, 12, 13, 15 ... Wire net, 14 ... Piping.

Claims (1)

[Claims] 1. An oil-cooled screw compressor having various devices such as a safety valve for exhausting air into a compressor unit, a solenoid valve for intake / exhaust, a suction throttle valve, etc., for preventing spread of flame in the compressor unit due to combustion in an oil separator. A wire net for preventing ignition and spread of oil-cooled screw compressors, which maintains the functions of the safety valve, solenoid valve, and suction throttle valve, and shuts off the flame from the intake and exhaust ports.