JPH01200096A - Emergency oil feeding device for centrifugal compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for shutting down a centrifugal compressor after a trip signal is generated to stop the drive of the centrifugal compressor in response to a drop in lubricating oil pressure due to a failure in the main oil supply system. This relates to an emergency oil supply system that supplies lubricating oil until the system stops.

[Conventional technology]

When the lubricating oil pressure supplied to the centrifugal compressor decreases due to a failure in the main oil supply system, a system is generally adopted that generates a trip signal when the pressure drops below a certain pressure level and stops the drive of the centrifugal compressor.

However, since the rotor of a centrifugal compressor has inertia even after the drive has stopped, it takes some time for the rotor to completely stop. Therefore, conventionally, NIB Standard 614. Second Edition (1984), Figure A
-13A (API 5TANDARD6145tI
COND EDITION (1984) FIGA-
13A), the head tank (rundown tank) is located higher than the centrifugal compressor (approximately 6 m).
The amount of lubricating oil required from when a trip signal is generated until the centrifugal compressor comes to a complete stop is stored in it, and after a trip signal is generated due to a drop in the lubricating oil pressure,
This tank normally supplies lubricating oil to the centrifugal compressor.

[Problem to be solved by the invention J] In the above conventional technology, the head tank is placed at a higher level than the centrifugal compressor. (approximately 6m). Therefore, the equipment becomes large-scale, the construction cost is high, and the maintainability is poor.

The first object of the present invention is to make such a large-scale emergency lubrication system more compact.

When providing an emergency refueling pump, a direct current motor using an emergency power supply can be considered as its driving source, but this requires power supply equipment and increases costs. Also, JP-A-52-11
As described in No. 2106, high-pressure gas pressurized by a centrifugal compressor is used as a power source, and when a trip signal is generated due to a drop in lubricating oil pressure, this high-pressure gas is used to drive a gas turbine or other drive device directly connected to an emergency oil supply pump. It is also possible to consider a method of turning the engine, but this method requires a gas turbine, etc., which is costly.

A second object of the present invention is to use the inertia of a centrifugal compressor as a drive source for an emergency refueling pump, thereby simplifying the equipment associated with the pump.

Next, installing an oil supply pump at the shaft end of the main engine is an existing technology, but in the past, the pump was directly connected to the shaft end of the main engine and was used as the main oil pump to supply lubricating oil during normal operation. There is. However, in centrifugal compressors, there are cases where the turbine is driven.

The spindle rotation speed often varies depending on operating conditions.

The pump discharge pressure is not constant, and the pump is rotating during normal operation, making maintenance of the pump difficult.The third object of the present invention is when an emergency oil supply pump is installed at the shaft end of a centrifugal compressor. , the purpose is to effectively utilize the rotation of the main shaft without being subject to the above-mentioned restrictions.

[Means to solve the problem]

The above purpose is to provide an emergency refueling pump, a clutch that connects and disconnects the emergency refueling pump to the main shaft of a centrifugal compressor, and a lubricating oil pressure monitoring means, so that during normal operation when the lubricating oil pressure is normal, the clutch This is accomplished by providing a clutch operating means that keeps the clutch in the ``off'' state and brings the clutch into the ``1-on'' state in response to a trip signal due to a decrease in lubricating oil pressure.

[Effect]

In the above configuration, during normal operation when the lubricating oil pressure is normal, the clutch between the emergency oil supply pump and the main shaft of the centrifugal compressor is in the "disengaged" state.

The emergency fuel pump has stopped. Therefore, maintenance of the emergency refueling pump is possible at any time during normal operation. - Whenever a trip signal is generated due to a drop in lubricating oil pressure, this trip signal brings the clutch into the "on" state. Therefore, the emergency oil pump is connected to the main shaft of the centrifugal compressor, and is driven by the inertia of the main shaft until the centrifugal compressor completely stops, and after the trip signal is generated, the centrifugal compressor completely stops. Supply the necessary lubricant until Therefore, there is no need to install a head tank as in the conventional case. In addition, the inertia of the centrifugal compressor is used to drive this emergency oil pump, so it is powered by a DC motor.

A special drive source such as a gas turbine is not required.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

During normal operation, lubricating oil at a constant pressure is supplied to the centrifugal compressor 1 from the main oil supply device 10. Main oil supply device! ! When the lubricating oil pressure decreases due to a failure of the oil supply pump or the like in the oil supply line and becomes below a certain pressure level, a trip signal is generated from the pressure switch 11, which is a lubricant oil pressure monitoring means installed in the oil supply line, and is directly connected to the centrifugal compressor 1. The driving machine 2 receives the trip signal and stops driving. However, since the rotor of the centrifugal compressor 1 has inertia even after the drive is stopped, it takes some time for it to completely stop, and it is necessary to continue supplying lubricating oil during that time. Therefore, in the present invention, an emergency oil supply pump 3 is installed at the shaft end of the centrifugal compressor 1, and the centrifugal compressor 1
The structure is such that it is connected to the main shaft of the main shaft via a crack 6. The servo mechanism 12, which is a clutch operating means, is activated by a signal from the pressure switch 11 to "connect" the clutch 6.
Or it will be in a “disconnected” state.

During normal operation when the lubricating oil pressure is normal, Taraccillo “
The emergency oil supply pump 3 and the main shaft of the centrifugal compressor 1 are not connected.

Main refueling system! When the lubricating oil pressure supplied from 10 falls below a certain pressure level and a trip signal is generated from the pressure switch 11, the drive unit 2 receives this signal and stops driving the centrifugal compressor 1, but at the same time, the clutch 6 The servo mechanism 12 brings them into a "contact" state, and the main shaft of the centrifugal compressor 1 and the emergency oil pump 3 are connected. Therefore, the emergency oil supply pump 3 is driven by the inertia of the main shaft of the centrifugal compressor 1 after the drive has stopped, pumps lubricating oil from the oil reservoir (shared with the main oil supply device 1) 9, and operates the oil cooler 7 and oil filter 8. Then, necessary lubricating oil is supplied to the centrifugal compressor 1 until it comes to a complete stop.

A gear 4 is provided between the main shaft of the centrifugal compressor 1 and the emergency oil supply pump 3, and the pump rotation speed is adjusted so that the emergency oil supply pump 3 can fully exhibit its performance.

Further, a control valve 5 is provided in the emergency oil supply line to keep the lubricant supply pressure constant.

When the failure of the main oil supply system 10 is recovered and the centrifugal compressor 1 is restarted, the clutch 6 is returned to the "disengaged" state.

〔Effect of the invention〕

According to the present invention, the necessary lubricating oil is supplied from when a trip signal is generated to stop driving the centrifugal compressor in response to a drop in lubricating oil pressure due to a failure of the main oil supply system until the centrifugal compressor completely stops. This is done by an emergency oil supply pump that is connected to the main shaft of the centrifugal compressor via a clutch, so there is no need to install a large head tank for emergency oil supply at a high place above the centrifugal compressor, as was the case in the past. Therefore, construction costs can be reduced and maintenance can be facilitated.

Further, during normal operation, this emergency oil supply pump is disconnected from the main shaft of the centrifugal compressor by a clutch and stopped, so maintenance can be performed at any time during normal operation. Furthermore, the present invention utilizes the inertia of the compressor rotor after the drive has stopped to obtain the driving force for the emergency refueling pump. It is advantageous in terms of cost and maintenance.

[Brief explanation of the drawing]

The figure is a schematic diagram of an oil flow system according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Centrifugal compressor, 2...Driver, 3...Emergency oil supply pump, 6...Clutch, 10...Main oil supply device, 11...Pressure switch which is a lubricant oil pressure monitoring means ,1
2... Servo mechanism that is the clutch operating means. Drawing Western Sheep 1 Drawing Lukura 1. , procedure correction writing method) 1. Display of the incident 1988 Patent Application No. 21972 2 Name of the invention Emergency lubrication system for centrifugal compressor 1 Person making the correction 1 Rumors and 1 Section Patent applicant name Ya (5101 Stock Company +, 1 Hitachi Ltd. 4, Agent 7, contents of amendment

Claims (1)

[Claims] 1. In the emergency lubrication system that supplies lubricating oil from when a trip signal is generated to stop driving the centrifugal compressor in response to a drop in lubrication oil pressure due to a failure in the main lubrication system until the centrifugal compressor stops. , an emergency oil supply pump, a clutch that connects and disconnects the emergency oil supply pump and the main shaft of the centrifugal compressor, and a lubricating oil pressure monitoring means, which disconnects the clutch during normal operation when the lubricating oil pressure is normal. An emergency oil supply system for a centrifugal compressor, characterized in that the emergency oil supply device for a centrifugal compressor is provided with a clutch operating means for keeping the clutch in the "closed" state in response to a trip signal due to a drop in lubricating oil pressure.