KR101422943B1 - Rotary fluid machine - Google Patents

Abstract

1. A fluid rotary machine comprising: an oil reservoir for storing lubricating oil; a moisture detector for detecting moisture in lubricating oil stored in the oil reservoir; and a control means for stopping the operation when the moisture detector detects moisture, And a trap portion protruding further downward at the lowest position of the bottom wall, wherein a moisture detector is provided in the trap portion, and the volume of the trap portion is between 0.2% and 3.0% of the total amount of the lubricant. With this configuration, when moisture is mixed into the lubricating oil, it is possible to stop safely.

Description

[0001] ROTARY FLUID MACHINE [0002]

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a fluid rotary machine such as a rotary pump for sending or compressing a fluid by a rotational force or a fluid pressure motor for generating a rotational force by the pressure of fluid, And the rotational force of the rotating shaft.

In many fluid spinning machines, it is not uncommon to have a system that circulates lubricating oil, such as bearings, using a pump. In such an apparatus, once water enters from one of the systems for circulating the lubricating oil, for example, from one bearing, such as steam or drain, into the lubricating oil, the lubricating oil mixed with water is supplied to all the lubricating portions such as other bearings , The function of each part is reduced or damaged.

However, in the conventional fluid rotary machine, it is difficult to guarantee the integrity of the shaft rod. For example, in the fluid rotary machine for steam using the shaft rod device of the type in which the compressed air is supplied to the seal space formed between the rotary shaft and the casing, the supply of the compressed air can not be completely guaranteed. Alternatively, for example, even in a water-injecting screw compressor using water for lubricating and sealing a screw rotor, water is prevented from entering the bearing by a sealing device using compressed air or a lip seal, There is a risk that water will be incorporated into the water.

"Bearing Health Management", NTN Corporation, CAT. NO. 3017 / J, P6, there is a description that the water content of 0.2% by volume with respect to the water allowable amount is the exchange limit of the lubricating oil. However, in the conventional fluid rotating machine, even if steam or drain is mixed into the lubricating oil, mixing of water can not be noticed until a problem actually occurs, and there is a problem that large damage is generated.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a fluid rotary machine capable of stopping safely when moisture is mixed into lubricating oil and a fluid rotating machine in which moisture is less likely to be mixed into lubricating oil.

In order to solve the above problems, the present invention provides a fluid rotating machine for energy conversion between pressure or kinetic energy of a fluid including steam or water and rotating force of a rotating shaft, comprising: an oil reservoir for storing lubricating oil supplied to the fluid rotating machine ; A moisture detector for detecting moisture in the lubricant oil stored in the oil tank; And a control device for stopping the operation when the moisture detector detects moisture equal to or greater than a predetermined amount.

According to this configuration, moisture can be detected relatively easily in the oil tank in which moisture is easily separated by sedimentation, and when the moisture is detected, the operation is stopped, so that the apparatus is not damaged. Further, before the bearings and the like are damaged, the discharge of water and the replacement of oil can be promoted, and the service life of the device is prolonged.

In the fluid rotary machine of the present invention, it is preferable that the oil reservoir has a trap portion whose bottom wall is inclined and further protrudes downward at the lowest position of the bottom wall, and the moisture detector is installed in the trap portion .

According to this configuration, since the sedimented water is collected in the small trap portion, the thickness of the water layer in the trap portion becomes large, so that the moisture can be easily detected.

The volume of the trap portion is preferably between 0.2% and 3.0% of the total lubricating oil amount.

According to this configuration, it is preferable to detect that the amount of water corresponding to the upper limit value of the proportion of the water allowed to be mixed into the lubricating oil is stored.

It is preferable that the oil vat has a circulation pump that has an outlet at a position spaced from the trap portion of the bottom portion and takes out the lubricating oil from the outlet and supplies the lubricating oil to a predetermined portion of the fluid rotating machine.

According to this configuration, only the lubricating oil can be supplied to a predetermined portion of the fluid rotating machine without drawing the water stored in the trap portion to the circulating pump.

As the moisture detector, a capacitive sensor can be used.

According to this configuration, a small-sized sensor is provided, the detection accuracy is high, and maintenance is easy.

Further, the present invention is a fluid rotating machine for energy conversion between pressure or kinetic energy of a fluid including steam or water and rotational force of a rotating shaft, and has a fluid reservoir for storing lubricating oil supplied to the fluid rotating machine, The oil tank includes a discharge port at a position spaced apart from the trap portion of the bottom portion. The lubricant is taken out from the discharge port, and the lubricant is discharged from the discharge port. And a circulation pump for supplying the lubricating oil to a predetermined portion of the fluid rotating machine.

According to this configuration, only the lubricating oil can be supplied to the predetermined portion of the fluid rotating machine without drawing the water stored in the trap portion to the circulating pump.

It is preferable that the trap portion is provided with the moisture detector.

Preferably, the control apparatus further includes a control device for stopping the operation when the moisture detector detects moisture of a predetermined amount or more.

The volume of the trap portion is preferably between 0.2% and 3.0% of the total amount of the lubricant.

As the moisture detector, a capacitive sensor can be used.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of a steam driven two-stage compression apparatus which is one embodiment of a fluid rotary machine of the present invention. Fig.
2 is a perspective view of a casing portion constituting the oil vat of the vapor-driven compressor of FIG. 1;
3 is a cross-sectional view of the casing portion of Fig.

Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows the structure of a steam-driven two-stage compression apparatus 1 which is one embodiment of the fluid rotary machine of the present invention. The compressor 1 of the present embodiment is configured to drive the first stage compressors 3 and the second stage compressors 4, which are screw compressors, by means of a steam motor 2 comprising a screw expander. The rotary shaft of the steam motor 2, the first stage compressor 3, and the second stage compressor 4 are rotatably connected by a gear mechanism of the gear box 5. The casing of the steam motor 2, the first stage compressor 3, and the second stage compressor 4 are integrally connected to the casing of the gear box 5.

Steam is supplied to the steam motor (2) through a displacement control valve (6). The steam motor 2 converts the expansion force of the steam into the rotational force of the rotor shaft by a pair of male and female screw rotors housed in the casing. The steam which has expanded in the interior of the steam motor 2 and has been reduced in pressure is discharged from the steam motor 2 and is secondarily used by the waste or other facility.

The rotor shaft of a pair of male and female screw rotors housed in the casing is rotationally driven by the steam motor 2 through the gear mechanism of the gear box 5 so that the first stage compressor 3 and the second stage compressor 4, And is configured to suck and compress air by a screw rotor. The first stage compressor (3) sucks the outside air through the suction filter (7) and discharges the compressed air. The second stage compressor (4) sucks the air compressed by the first stage compressor (3) through the intercooler (8) and compresses it. The compressed air discharged by the second stage compressor (4) is supplied to the demand equipment through the aftercooler (9), the check valve (10) and the drain separator (11). Between the aftercooler 9 and the check valve 10 is provided a windshield valve 12 and an auxiliary windshield valve 13 and a silencer 14 provided at the end to prevent excessive increase of the discharge pressure. And a flow path for discharging the compressed air to the atmosphere through a pipe.

The gear box 5 houses gears for connecting the rotary shaft of the steam motor 2 and the rotary shaft of the first stage compressor 3 and the rotary shaft of the second stage compressor 4 inside the casing. In the lower part of the casing, oil vat 5a for storing lubricating oil for lubricating the gear is formed. The lubricating oil stored in the oil vat 5a is sucked by the circulation pump 15 and supplied to the steam motor 2 through the oil cooler 16 and the oil filter 17, And is supplied to necessary positions such as the bearings of the compressor (3) and the second stage compressor (4). Cooling water is supplied to the oil cooler 16, the aftercooler 9 and the intercooler 8 through the cooling water adjusting valve 18. [

A moisture detector 19 for detecting the moisture accumulated in the lower end of the oil vat 5a by sedimentation is provided in the lower portion of the oil vat 5a of the gear box 5. The detection signal of the moisture detector 19 is inputted to a controller (control means) 20 for controlling the capacity control valve 6, the circulation pump 15 and the cooling water adjustment valve 18. [ The controller 20 closes the capacity control valve 6, stops the circulation pump 15, and closes the cooling water adjustment valve 18 when the moisture detector 19 detects moisture. Thereby, the compression apparatus 1 stops its operation.

2 and 3 show the casing 21 constituting the lower portion of the casing of the gear box 5 of the compression apparatus 1 of the present embodiment and fixing the oil vat 5a. The casing portion 21 is formed in a substantially box shape, and the upper portion thereof is opened. The bottom wall 22 of the casing part 21 has three gently sloping faces so that the center side is lowered and a trap part 23 which projects further downward and forms a small box shape Respectively.

The trap portion 23 has a volume of 0.2% to 3% of the volume of the total amount of the lubricating oil of the compression device 1. The casing portion 21 is provided with a sensor hole 24 opened to the trap portion 23 and a discharge port 25 opened to the side wall at a maximum height of the bottom wall at a position spaced from the trap portion 23 . In the sensor hole 24, a moisture detector 19 is provided. The discharge port 25 is connected to a circulation pump 15 for extracting the lubricating oil stored in the casing unit 21 (oil tank 5a). The circulation pump 15 is connected to a pipe for re-supplying lubricating oil to a predetermined portion of the steam motor 2, the first stage compressor 3, and the bearings of the second stage compressor 4, for example. With this configuration, the lubricating oil stored in the casing portion 21 (oil vat 5a) can be supplied to the first stage compressor 3 (3) without drawing the water stored in the trap portion 23 to the circulation pump 15, And the second stage compressor (4).

The moisture detector 19 is a capacitive sensor for detecting the capacitance between the distal end portion and the root portion of the rod-shaped portion inserted in the trap portion 23, and the distal end portion and the root portion are short- The amount of water in the trap portion is detected.

The incorporation of moisture into the gear box 5 is caused, for example, by a malfunction of the shaft end device of the steam motor 2. In the steam motor 2, compressed air is supplied to the axial space formed between the space for accommodating the screw rotor and the space for accommodating the bearing, thereby preventing the steam from leaking to the bearing chamber and hence to the gear box 5 Consists of. When the supply of the compressed air stops due to any cause, the steam for driving the screw rotor leaks to the gear box 5.

Generally, the incorporation of moisture into the lubricating oil for bearings is limited to about 0.2% by volume. Therefore, in consideration of the size and the like of the moisture detector 19 so that the moisture detector 19 can detect that a predetermined volume of water not exceeding 0.2 volume% of the total lubricating oil amount is stored in the trap portion 23 And the volume of the trap portion 23 is determined. Specifically, it is preferable that the trap portion 23 has a volume of 0.2% to 3.0% of the volume of the total lubricating oil amount.

In this way, the compressor 1 of the present embodiment detects the incorporation of moisture into the lubricating oil before the bearing or the like is broken, and stops the operation. Thereby, the user is urged to exchange lubricating oil, thereby preventing damage to the apparatus such as damage to bearings and abrasion of the screw rotor, and increase the service life of the apparatus. Further, it is preferable that the compression device (1) is provided with an alarm device informing the user that the user is stopped due to moisture contamination.

INDUSTRIAL APPLICABILITY The present invention can be applied not only to a steam expander such as a steam motor, but also to a rotary machine handling a fluid including water or water, such as a steam compressor, a water jet type gas compressor, and the like.

Claims (10)

A fluid rotating machine for energy conversion between pressure or kinetic energy of a fluid including steam or water and rotational force of a rotational shaft,
An oil reservoir for storing the lubricating oil supplied to the fluid rotating machine,
A moisture detector for detecting moisture in the lubricant oil stored in the oil tank;
And a control device for stopping the operation when the moisture detector detects moisture at a predetermined amount or more,
The oil vat is provided with a trap portion whose bottom wall is inclined and protruding further downward at the lowest position of the bottom wall, the moisture detector is installed in the trap portion, and a discharge port is provided at a position apart from the trap portion of the bottom portion and,
And a circulation pump for taking out the lubricating oil from the discharge port and supplying the lubricating oil to a predetermined portion of the fluid rotating machine. delete The fluid rotating machine according to claim 1, wherein the volume of the trap portion is between 0.2% and 3.0% of the total amount of the lubricant. delete 4. The fluid rotary machine as claimed in claim 1 or 3, wherein the moisture detector is a capacitive sensor. A fluid rotating machine for energy conversion between pressure or kinetic energy of a fluid including steam or water and rotational force of a rotational shaft,
And a fluid reservoir for storing the lubricating oil supplied to the fluid rotating machine,
Wherein the oil reservoir has a bottom wall sloping and a trap portion protruding further downward at a lowest position of the bottom wall,
Wherein the oil vat has an outlet at a position spaced apart from the trap portion of the bottom portion,
And a circulation pump for taking out the lubricating oil from the discharge port and supplying the lubricating oil to a predetermined portion of the fluid rotating machine. The fluid rotary machine according to claim 6, wherein a moisture detector is installed in said trap portion. The fluid rotary machine according to claim 7, further comprising a control device for stopping the operation when the moisture detector detects a predetermined amount or more of moisture. 8. The fluid spinning machine as claimed in claim 7, wherein the volume of the trapping portion is between 0.2% and 3.0% of the total amount of the lubricating oil. 10. A fluid spinning machine according to any one of claims 7 to 9, wherein the moisture detector is a capacitive sensor.

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