JPH07332016A - Automatic bypass oil feeding line for bearing protection - Google Patents

Abstract

PURPOSE:To surely feed high pressure lubricating oil to a bearing in a turbine and the like so as to protect a bearing even when a cause of a drop in lubricating oil line pressure lies in an oil cooling device or in an oil strainer. CONSTITUTION:If a line pressure cannot be recovered even by the operation of an emergency pump 3 which is started when a lubricating oil feeding line pressure is reduced, an oil feeding line from the emergency pump 3 to a bearing via an oil cooling device 6 and an oil strainer 8 is switched to an oil feeding line, which bypasses the oil cooling device 6 and the oil strainer 8, from the emergency pump 3 to the bearing. Switching of the oil feeding line is constructed of a three-way solenoid valve operated by a pressure switch detecting a drop in the lubricating oil feeding line pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply line requiring oil supply to a bearing, and more particularly to an automatic bypass oil supply line for bearing protection applied to turbines, speed reducers, generators and the like.

[0002]

2. Description of the Related Art In conventional bearing oil supply lines for turbines, speed reducers, and generators, if the lubricating oil oil supply line pressure drops for some reason, the auxiliary oil pump and also the emergency oil pump automatically start to operate on each bearing. Lubricating oil was being supplied, but at that time, the lubricating oil always passes through the oil cooler and the oil strainer, so if there is a cause of low hydraulic pressure in these devices, there was a possibility that the bearing could not be lubricated. .

[0003]

As described above, the conventional bearing oil supply line is configured so that the supplied lubricating oil is supplied through the oil cooler and the oil strainer even in an emergency when the lubricating oil supply line pressure drops. There are many things. However, when the oil cooler or the oil strainer causes the decrease in hydraulic pressure, there is a drawback that the bearings such as the turbine cannot be sufficiently lubricated due to the above-described configuration. Therefore, the present invention is intended to solve the above-mentioned conventional problems. Even when the cause of the decrease in the pressure of the lubricating oil supply line is in the oil cooler or the oil strainer, high-pressure lubrication for the bearings of the turbine or the like is performed. It is intended to provide an automatic bypass oil supply line for bearing protection capable of reliably supplying oil to protect the bearing.

[0004]

Therefore, according to the present invention, when the line pressure is still not recovered by the operation of the emergency pump started when the pressure of the lubricating oil supply line is reduced, the oil cooling from the emergency pump is performed. The oil supply line to the bearing via the oil cooler and the oil strainer is switched to the oil supply line from the emergency pump to the bearing bypassing the oil cooler and the oil strainer. Is a means for. Further, the present invention is configured such that the switching of the lubricating oil supply line is performed by a three-way solenoid valve operated by a pressure switch that detects a decrease in the lubricating oil supply line pressure, and when the lubricating oil supply line pressure decreases, A plurality of pressure switches for detecting different reduced pressures are provided downstream of the oil strainer, and the emergency oil pump is started by these pressure switches, and the three-way pressure is set by the line pressure lower than the starting pressure of the emergency pump. The solenoid valve is switched to an oil supply line that bypasses the oil cooler and the oil strainer, which is a means for solving the problem.

[0005]

According to the present invention, by providing a pressure switch set to a value lower than the set pressure for automatic start of the emergency oil pump at the downstream outlet of the lubricating oil strainer, the lubricating oil pressure is reduced to this set pressure. In that case, the three-way solenoid valve provided downstream of the emergency oil pump is switched, and the lubricating oil flows through the bypass line that passes through the oil cooler and the oil strainer. As a result, even if the emergency oil pump operates, if the lubricating oil refueling line pressure still does not recover, it is considered that there is a cause of the line pressure drop in the oil cooler and the oil strainer, and it is necessary to bypass them. Since the three-way solenoid valve is switched, even in such an emergency, it is possible to reliably supply appropriate high-pressure lubricating oil to the bearing of the turbine or the like to protect the bearing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a system showing the embodiment of the present invention. At normal times, oil is supplied from the oil tank 1 to the control oil line and the lubricating oil supply line to the bearings of the turbine and the like (reduction gear, generator, etc.) by the main pump (not shown). The lubricating oil supply line is branched from the control oil line, and an oil amount adjusting valve 4, a check valve 5, an oil cooler 6, a lubricating oil temperature adjusting valve 7, an oil strainer 8 and a check valve 9 are sequentially arranged in series. Lubricating oil is supplied to bearings such as turbines arranged in an array.
Further, the control oil line is provided with an auxiliary oil pump 2 which is started when the line pressure of the lubricating oil supply line decreases. On the other hand, from the oil tank 1, a line connected to the upstream of the oil cooler 6 via the emergency oil pump 3 and the three-way solenoid valve 10, and from the three-way solenoid valve 10 to the oil cooler 6,
A bypass line is provided that bypasses the lubricating oil temperature control valve 7, the oil strainer 8 and the check valve 9 and is connected to a bearing such as a turbine. Then, at the downstream of the oil strainer 8, when the lubricating oil line pressure is reduced, different reduced pressures PS1, PS
Multiple pressure switches 1 to detect 2 and PS3 respectively
1, 12, 13 are provided.

Next, the operation of the embodiment configured as described above will be described. For some reason, the pressure of the lubricating oil line drops, and when the pressure switch (PS1) 11 operates, the auxiliary oil pump 2 automatically starts. As a result, the lubricating oil is supplied to the lubricating oil supply line, but when the pressure further decreases and the pressure switch (PS2) 12 operates, the emergency hydraulic pump 3 automatically starts. At this time, the three-way solenoid valve 10 is open in the direction of passing through the oil cooler 6 and the oil strainer 8.
Even if the line pressure is not recovered even by this and the pressure further decreases and the pressure switch (PS3) 13 operates, the three-way solenoid valve 10
Will be switched, and the lubricating oil will be directly supplied to the bearing such as the turbine through the bypass line. At this time, a check valve 9 is provided to prevent backflow to the oil strainer 8 side.
As a result, even if the emergency oil pump 3 operates, if the lubricating oil supply line pressure still does not recover, the oil cooler 6
Assuming that there is a cause for the line pressure drop in the oil and oil strainer 8, the three-way solenoid valve 3 is switched so as to bypass the line pressure. The lubricating oil can be reliably supplied to protect the bearing.

[0008]

As described above in detail, according to the present invention, even if the emergency oil pump is started, the lubricating oil pressure does not recover due to the decrease in the lubricating oil line pressure in the oil cooler and the oil strainer. In this case, it is possible to directly and reliably supply proper and high-pressure lubricating oil to bearings such as turbines through a line that bypasses these oil coolers and oil strainers by switching the three-way solenoid valves. Therefore, even in such an emergency, it is possible to surely supply the appropriate high-pressure lubricating oil to the bearings of the turbine or the like, so that it is possible to avoid a serious disaster of bearing burning.

[Brief description of drawings]

FIG. 1 is a system diagram of an automatic bypass refueling line according to an embodiment of the present invention.

[Explanation of symbols]

 1 Oil tank 2 Auxiliary oil pump 3 Emergency oil pump 4 Oil amount adjustment valve 6 Oil cooler 8 Oil strainer 10 Three-way solenoid valve 11, 12, 13 Pressure switch

Claims (3)

[Claims] 1. When the line pressure is still not recovered by the operation of the emergency pump that is started when the pressure of the lubricating oil supply line is lowered, the emergency pump is operated via an oil cooler and an oil strainer. An automatic bypass lubrication line for bearing protection, characterized in that the lubrication line to the bearing is switched from the emergency pump to the lubrication line to the bearing that bypasses the oil cooler and the strainer. 2. The bearing protection according to claim 1, wherein the switching of the oil supply line is performed by a three-way solenoid valve operated by a pressure switch that detects a pressure drop of the lubricating oil supply line. Automatic bypass refueling line. 3. A plurality of pressure switches for respectively detecting different reduced pressures when the pressure of the lubricating oil supply line is reduced are provided downstream of the oil strainer, and the emergency oil pump is activated by these pressure switches, 3. The automatic bearing protection system according to claim 2, wherein the line pressure lower than the starting pressure of the emergency oil pump switches the three-way solenoid valve to an oil supply line bypassing the oil cooler and the oil strainer. Bypass refueling line.