JP2000038905A - Hydraulic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a normal turbine oil safely, reduce arrangement costs and operating costs, and improve maintenance property by arranging a main oil pump and an auxiliary oil pump in parallel with each other in a control oil supplying passage. SOLUTION: During operation of a main machine 20, oil is sucked from a control oil pump 29 by a main oil pump 2, and is supplied to a hydraulic control system through control oil supplying pipe passages 1a and 1. After it is used in the hydraulic control system, it is returned through a control oil return pipe passage 6, and foreign matters are filtered by return oil filters 7, 7. After that, the oil is returned to a control oil tank 9. When the main machine 20 is started, when a main oil pump 2 is damaged, or its capacity is reduced, or when much control oil rate are necessitated, an auxiliary pump 3 is operated, oil is sucked and discharged from the control oil tank 9 through an auxiliary intake pipe 27, and control oil in the hydraulic control system is supplied through the control oil supplying pipe passages 1b, 1. It is thus possible to stably control oil pressure under every operating conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control device for a motor, such as a gas turbine or a steam turbine, which performs hydraulic control using high-pressure control oil.

[0002]

The control oil for oil pressure control in a gas turbine or a steam turbine requires a high pressure and a high cleanliness from the viewpoint of quickly operating a control valve and supplying clean control oil to a servo valve. For example, pressure 100kg / cm
² requires NSA grade 6 cleanliness). In addition, since the control oil for hydraulic control is at a high pressure, in the unlikely event that it leaks, it will be scattered in a mist and ignite, preventing the occurrence of a fire. ing. For this reason, as a control oil for a steam turbine, a phosphate ester-based flame-retardant hydraulic oil that does not cause ignition even if it leaks is used, and the turbine oil is not used in a gas turbine. .

[0003] However, the phosphate ester-based flame retardant oil
Although the safety against leakage is good as described above, it is necessary to adjust the neutralization value of the oil, and therefore, it is necessary to prevent the deterioration of the oil through the activated clay filter and return the oil to the control oil tank. Further, such a phosphate ester-based flame-retardant oil is expensive and has little versatility, so it is considered difficult to obtain it at any time. Further, since it is an expensive oil, a polishing apparatus for refining it is necessary. And

As described above, in the prior art, when the above-mentioned phosphate ester-based flame-retardant oil is used as a control oil, the device becomes complicated because the above-mentioned clay filter and polish device are used. At the same time, there is a problem that the cost of the apparatus and the operation are soared in combination with the fact that the oil itself is expensive, and that there is a difficulty in maintenance and that the oil itself is difficult to obtain at any time.

In view of the problems of the prior art, the present invention makes it possible to use ordinary turbine oil in place of the above-mentioned phosphoric ester-based flame-retardant oil safely without causing a danger such as fire or the like. It is an object of the present invention to provide a control hydraulic device in which operation costs are reduced and maintainability is improved.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides, as a first invention, a motor which uses high-pressure oil as control oil for a hydraulic control system such as a control valve or a servo valve. A main oil pump directly connected to the prime mover and an auxiliary oil pump driven by a motor are installed in parallel in a control oil supply path that uses turbine oil to supply the turbine oil to the hydraulic control system. A hydraulic control device characterized by the following is proposed.

According to a second aspect of the present invention, in a prime mover using a high-pressure oil as a control oil for a hydraulic control system such as a control valve or a servo valve, a turbine oil is used as the control oil, and the turbine oil is supplied to the hydraulic control system. A hydraulic control device is characterized in that a main oil pump driven by a motor and an auxiliary oil pump driven by a motor are installed in parallel in a control oil supply path to be supplied.

[0008] In a third aspect, in addition to the first and second aspects,
Filters for filtering control oil are provided in the control oil supply path and the control oil return path from the hydraulic control system to the control oil tank, respectively.

According to this invention, during normal operation, control oil is supplied at a required flow rate and pressure to the hydraulic control system by the main oil pump driven by the main engine or the motor.
When the main engine starts, when the main oil pump breaks down,
When the control oil amount needs to be increased, for example, the auxiliary oil pump driven by the motor is operated. Therefore, in any operation state, the two oil pumps are operated in parallel or independently to perform a required control. Oil can be supplied to the hydraulic control system.
In addition, the properties of the control oil are favorably maintained by the double filtration of foreign substances by filters provided on both the supply path of the control oil to the hydraulic control system and the return path from the hydraulic control system. .

Therefore, according to the invention, even if the turbine oil is used as the control oil, the supply amount and the supply pressure of the control oil are accurately controlled, and the deterioration of the properties is kept to a minimum, and the operation Even if there is an error or sudden change in the hydraulic control device, a hydraulic control device that does not leak control oil can be obtained.

Therefore, according to the invention, even if the turbine oil is used, the operation of the control oil can be stably performed without leakage, and the device such as the clay filter and the polish device when the phosphate ester-based flame retardant oil is used. Is not required, the apparatus is simplified, the apparatus cost is reduced, and the use of expensive phosphate ester-based flame-retardant oil is not required, so that the operating cost is also reduced. Further, since general-purpose turbine oil that can be easily maintained can be used, the maintainability is also improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a system diagram of a gas turbine hydraulic control device according to a first embodiment of the present invention. In FIG.
Reference numeral 20 denotes a gas turbine, that is, a main engine, reference numeral 2 denotes a main oil pump directly driven to the main engine 20, and reference numeral 3 denotes an auxiliary oil pump directly driven to a motor 25. 1a is a control oil supply line which is a discharge oil line from the main oil pump 2; 1b is a control oil supply line which is a discharge oil line from the auxiliary oil pump 3;
The two supply passages 1a and 1b join to form a control oil supply line 1 connected to a hydraulic control system (not shown).

Therefore, the main oil pump 2 and the auxiliary oil pump 3
Is provided in parallel with the control oil supply line 1 so that both oil pumps 2 and 3 can be operated simultaneously or individually. Reference numerals 5 and 5 denote supply oil filters for filtering supply control oil, and two (or one) oil supply filters are provided in the control oil supply pipe 1 in parallel. Reference numeral 22 (DP) denotes a differential pressure gauge for measuring the differential pressure of the control oil between the supply oil filters 5 and 5.

Reference numeral 33 denotes a pressure gauge for monitoring the discharge pressure of the main oil pump 2, and reference numeral 34 denotes a pressure gauge for monitoring the discharge pressure of the auxiliary oil pump 3. Reference numeral 4 denotes an accumulator for accumulating pressure provided in the control oil supply pipe 1. 9 is a control oil tank for storing control oil, 32 is a main suction pipe connecting the control oil tank 9 and a suction port of the main oil pump 2, and 27 is a control oil tank and the auxiliary oil pump 3. Auxiliary suction pipe for connecting

A control oil return line 6 from the hydraulic control system is connected to the control oil tank 9. 7, 7 are provided in parallel in the return line 6 (one may be provided).
It is a return oil filter for return oil filtration of control oil. 23
(DP) is a differential pressure gauge for measuring the differential pressure across the return oil filters 7,7. Reference numeral 8 denotes an oil cooler for cooling the return oil, which is provided in the control oil return pipe 6 on the downstream side of the return oil filters 7 and 7 (on the control oil tank 9 side).

Reference numeral 21 denotes a bypass line connecting the control oil return line 6 to the control oil supply line 1a on the main oil pump 2 side and the control oil supply line 1b on the auxiliary oil pump 3 side.
Are hydraulic control valves provided on the main oil pump side branch pipe 21a and the auxiliary pump side branch pipe 21b of the bypass pipe 21 respectively. Reference numeral 31 denotes a return oil passage for returning the return oil from the pressure adjusting mechanism (not shown) from the main oil pump 2 to the control oil tank 9. In this embodiment, turbine oil is used as control oil. In the drawing, reference numeral 51 denotes an air breather for surely bleeding line air, 52 denotes a check valve for preventing backflow of the line, 53 denotes a manually opened normally valve, 54 denotes a normally closed manual valve, and 55 denotes a time when the filter is clogged. A line protection safety valve, 56 is a level switch for alarming the oil level in the tank 9, 57 is a tank level on-site meter, 58 is a temperature switch for ON / OFF of a tank heater 59, 60 is a filter, and 61 is a metal object adsorption. It is a magnet for. These ensure the technical safety of the device.

In the gas turbine hydraulic control apparatus having the above-described configuration, during operation of the gas turbine, that is, the main engine 20, the main oil pump 2 directly connected to the main engine 20 drives the control oil tank 9 through the main suction pipe 32. The sucked and discharged control oil passes through control oil supply pipes 1a and 1, and after foreign substances are filtered by supply oil filters 5, 5 provided in parallel, is sent to a hydraulic control system (not shown). Is supplied to the operation of the hydraulic control system. The control oil after being used in the hydraulic control system is returned through the control oil return line 6, and the foreign matter is filtered again by the return oil filters 7, 7 provided in parallel. Is cooled and the temperature is returned to the control oil tank 9.

When the main engine 20 is started, when the main oil pump 2 is out of order, or when the capacity of the main oil pump 2 is reduced, or when a large amount of control oil is required, the auxiliary oil pump 3 driven by the electric motor 25 is operated to control the control oil tank. From 9, control oil is sucked and discharged through an auxiliary suction pipe 27, and is supplied to a hydraulic control system through control oil supply pipes 1 b and 1. Therefore, in any operation state, the required control oil is always sent to the hydraulic control system by the two main and auxiliary pumps 2 and 3, and stable hydraulic control is performed.

The control oil in the control oil supply pipes 1a and 1b reaches the hydraulic control valves 10 and 10 through the bypass pipes 21a and 21b, and the pressure is adjusted by the hydraulic control valves 10 and 10. Thereafter, the pressure of the control oil is maintained at a required pressure by overflowing into the control oil return line 6 through the bypass line 21. In addition, the fluctuation of the pressure in the control oil supply line 1 is absorbed by the accumulator 4. The presence or absence of clogging of the supply oil filters 5 and 5 is detected by a differential pressure gauge 22, and the presence or absence of clogging of the return oil filters 7 and 7 is detected by a differential pressure gauge 23.

FIG. 2 is a system diagram of a hydraulic control device for a gas turbine according to a second embodiment of the present invention. In this embodiment, the main oil pump 2 is directly driven by a motor 26 to supply control oil to the control oil supply pipelines 1a and 1. Reference numeral 28 denotes a return oil passage from the auxiliary oil pump 3 to the control oil tank 9. The configuration other than the above is shown in FIG.
And the same members as those in the first embodiment are denoted by the same reference numerals.

In this embodiment, since the main oil pump 2 is driven by the motor 26, even if an abnormality occurs in the operation state of the main engine 20, the control oil is supplied without any trouble. The oil is sent to the hydraulic control system via the pipes 1a and 1 so that the hydraulic control system can be operated stably.

[0023]

As described above, according to the present invention, by providing the main oil pump and the auxiliary oil pump in parallel,
In any operation, the required control oil can be constantly supplied to the hydraulic control system without being affected by changes in the operation state of the main engine such as a gas turbine, failure of the main oil pump, and reduced performance. The state of the control oil can be favorably maintained by the filters provided in both the supply system and the return system.

As a result, even if turbine oil is used as the control oil, the supply amount and the supply pressure of the control oil are accurately controlled, the deterioration of the properties is kept to a minimum, and there is no error or sudden change in the operation. However, operation without leakage of control oil is possible.

Therefore, according to the present invention, it is possible to use turbine oil instead of the conventional phosphoric ester-based flame retardant oil, which eliminates the necessity of a clay filter and a polish device, and simplifies the device. Cost can be reduced.

In addition, the use of expensive and non-versatile phosphate ester-based flame-retardant oil is unnecessary, and the use of inexpensive and versatile turbine oil can reduce operating costs and maintainability. improves.

[Brief description of the drawings]

FIG. 1 is a system diagram of a gas turbine hydraulic control device according to a first embodiment of the present invention.

FIG. 2 is a system diagram of a gas turbine hydraulic control device according to a second embodiment of the present invention.

[Explanation of symbols]

 1, 1a, 1b control oil supply line 2 main oil pump 3 auxiliary oil pump 4 accumulator 5 supply oil filter 6 control oil return line 7 return oil filter 8 oil cooler 9 control oil tank 10 hydraulic control valve 20 main engine 21, 21a, 21b Bypass line 22, 23 Differential pressure gauge 25, 26 Motor

Claims (3)

[Claims] 1. A motor using a high-pressure oil as a control oil for a hydraulic control system such as a control valve or a servo valve, wherein the control oil uses a turbine oil as the control oil and supplies the turbine oil to the hydraulic control system. A hydraulic control device, wherein a main oil pump directly connected to the prime mover and an auxiliary oil pump driven by a motor are installed in a supply path in parallel. 2. A motor using a high-pressure oil as a control oil for a hydraulic control system such as a control valve or a servo valve, wherein the control oil uses a turbine oil as the control oil and supplies the turbine oil to the hydraulic control system. A hydraulic control device, wherein a main oil pump driven by a motor and an auxiliary oil pump driven by a motor are installed in a supply path in parallel. 3. The hydraulic control device according to claim 1, wherein a filter for filtering control oil is provided in the control oil supply path or the control oil return path from the hydraulic control system to the control oil tank.