JPH068736U - Oil quantity control valve in gas turbine starter - Google Patents

Abstract

(57) [Summary] [Objective] To provide a device capable of smoothing changes in the supply amount of hydraulic oil, slowing the increase in the amount of oil, and stopping the oil quickly to reduce the overshoot of current. [Structure] In a device in which an AC motor 1 starts a gas turbine 3 via a fluid coupling 2, a valve body 5 is attached to a housing 11
Two wall bodies 16a and 16b having communication ports 15a and 15b in the central portion are provided inside the first partition 17a and the second partition 16a.
17b and a third section 17c of the
First and second supply ports 18 and 19 connected to the three-way solenoid valve 14 above and below the compartment 17a, respectively, and the first outlet 20.
And a second outflow port 21 are provided, a solenoid valve supply port 25 connected to the three-way solenoid valve 14 and a housing supply port 26 connected to the hydraulic pump 4 are provided in the second section 17b, and the third section 17c is provided. An outlet 24 connected to the fluid coupling 2 is provided, a piston 12 is arranged in the first compartment 17a, and a valve rod 13 connected to the piston 12 is inserted into the communication ports 15a, 15b. In addition, the three-way solenoid valve 14 is configured to be controlled by the current value of the AC motor 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of an oil quantity control valve in a gas turbine starter.

[0002]

[Prior art]

 Generally, when starting a gas turbine, the starting force is applied to the gas turbine by a starting device having a drive device capable of controlling rotation. Various methods have been proposed for this gas turbine starter, one of which is the method using an AC motor and a fluid joint. That is, as shown in FIG. 4, the AC motor 1 is configured to be connectable to the gas turbine 3 via the fluid coupling 2, and the fluid coupling 2 is connected to the gas pump 3 by the supply line L having the valve body 5 on the way. It is designed to supply hydraulic oil.

When the gas turbine 3 is started, the valve body 5 is opened to supply hydraulic oil to the fluid coupling 2, and the rotational speed of the output shaft 2a of the fluid coupling 2 is sequentially increased. There is. As the valve body 5, a control valve 5a for adjusting the oil amount by an external signal V as shown in FIG. 5 (a) is conventionally provided, or as shown in FIG. 6 (a), the current value of the AC motor is limited. Therefore, it is proposed that a solenoid valve 5b for turning on and off the oil supply amount is provided and a bypass line 6 is provided for reducing the oil amount change.

[0004]

[Problems to be solved by the device]

 By the way, when the control valve 5a is used as shown in FIG. 5 (a), not only the device becomes expensive, but also the change in the rotation speed n of the output shaft 2a of the fluid coupling 2 as shown in FIG. 5 (b), Due to various factors such as oil viscosity and torque fluctuation of the output shaft, the amount Q of discharged oil in the fluid coupling 2 changes, which affects the transmission torque A and easily causes hunting, which is difficult to control.

On the other hand, when the solenoid valve 5b is used as shown in FIG. 6 (b), the current value A of the AC motor 1 greatly changes, and the current switch may overshoot, and the oil quantity Q There was a problem that the changes were large.

[0006]

[Means for Solving the Problems]

 The oil quantity control valve in the gas turbine starter according to the present invention for solving the above-mentioned problems of the prior art is configured such that the AC motor 1 can be connected to the gas turbine 3 via the fluid coupling 2. A gas turbine starter in which hydraulic fluid is supplied to a fluid coupling 2 from a hydraulic pump 4 via a valve body 5, the valve body 5 having two communication ports 15a and 15b in a central portion of a housing 11. The first partition 17a, the second partition 17b, and the third partition 17c are provided by providing the wall bodies 16a and 16b of the first partition 17a, and the first partition 17a is connected to the three-way solenoid valve 14 above and below the first partition 17a. Supply port 18 and second supply port 19, first outlet 20 and second outlet 21 are provided, and in the second section 17b, the supply port 25 connected to the three-way solenoid valve 14 and the hydraulic pump 4 are provided. A continuous supply port 26 is provided, An outlet 24 connected to the fluid coupling 2 is provided in the third compartment 17c, a piston 12 is arranged in the first compartment 17a, and a valve rod 13 connected to the piston 12 is connected to the communication opening 15a, 15b, and the three-way solenoid valve 14 is controlled by the current value of the AC motor 1.

[0007]

[Work]

 In the structure of the oil amount control valve in the gas turbine starter having such a configuration, when starting the gas turbine, the three-way solenoid valve is turned ON when the current value of the AC motor is at the lower limit, and the amount of hydraulic oil supplied to the fluid coupling is On the other hand, when the current value of the AC motor reaches the upper limit, the three-way solenoid valve is turned off and the supply amount is decreased.

[0008]

【Example】

 An embodiment of the structure of the oil quantity control valve in the gas turbine starter according to the present invention will be described below with reference to FIGS. 1 to 3. 1 and 2 each show a sectional view of an oil amount control valve, which includes a casing 11, a piston 12 delivered in the casing 11, and a piston 12 The valve rod 13 and the three-way solenoid valve 14 that are connected to each other. More specifically, wall bodies 16a and 16b having communication ports 15a and 15b in the central portion are arranged at intervals in the housing 11, whereby the first compartment 17a, the second compartment 17b, and the second compartment 17b. Three compartments 17c are formed.

A first supply port 18 connected to the three-way solenoid valve 14 in the vertical direction, a second supply port 19, a first outlet port 20, and a second outlet port 21 are provided in the first compartment 17 a. The first outlet 20 and the second outlet 21 are provided to communicate with an outlet 24, which will be described later, by a passage 23 having adjusting screws 22a and 22b, respectively. The second compartment 17b is provided with a solenoid valve supply port 25 connected to the three-way solenoid valve 14 and a supply port 26 connected to the hydraulic pump 4, and the third compartment 17c is provided with an outlet 24 connected to the fluid coupling 2. Is provided. Reference numeral 27 is an oil amount limiting screw, in which the piston 12 is arranged in the first section 17a, and the valve rod 13 connected to the piston 12 is inserted and arranged in the communication ports 15a and 15b. ing.

In the above structure, when the gas turbine is about to be started, the current value of the AC motor 1 is at the lower limit, so that the three-way solenoid valve 14 is in the ON state, that is, the state shown in FIG. In this state, the hydraulic oil from the hydraulic pump 4 goes from the line L ₁ to the three-way electromagnetic valve 14 via the housing supply port 26, the second section 17b, the solenoid valve supply port 25, and from there, the line L ₂ to the third line. The second supply port 19 is supplied to the lower side of the piston 12 in the first section 17a to raise the piston 12. By supplying this hydraulic oil, the valve rod 13 connected to the piston 12 also rises, and the lower end of the valve rod 13 opens the communication port 15b whose flow rate is limited or closed. As a result, the hydraulic oil rotates the fluid coupling 2 via the third compartment 17c to the outlet 24, and activates the gas turbine 3 via the output shaft 2a.

At this time, the hydraulic oil above the piston 12 flows into the outlet 24 from the first outlet 20 through the passage 23 whose flow rate is not adjusted by the adjusting screw 22a. Then, when the current value of the AC motor 1 reaches the upper limit, the three-way solenoid valve 14 is turned off. That is, as shown in FIG. 2, the line L ₁ and the line L ₃ come into communication with each other.

Therefore, the hydraulic oil reaching the three-way solenoid valve 14 from the line L ₁ is supplied above the piston 12 via the line L ₃ to the first supply port 18, and the piston 12 is lowered to be moved by the valve rod 13. It acts so as to close the communication port 15a. The rising or lowering speed of the piston 12 can be adjusted by operating the adjusting screws 22a and 22b. The relationship between the current value A, the rotational speed n of the fluid coupling, and the oil amount Q in the operation in this case is shown in FIG. 3, and the oil amount change can be smoothed.

[0013]

[Effect of device]

 As is apparent from the above description, the oil amount control valve in the gas turbine starter according to the present invention is configured so that the AC motor 1 can be connected to the gas turbine 3 via the fluid coupling 2, and the hydraulic coupling to the fluid coupling 2 can be changed. In the gas turbine starter configured to supply hydraulic oil from the pump 4 through the valve body 5, the valve body 5 is provided in the housing 11 with two wall bodies 16a having communication ports 15a and 15b in the central portion. 16b are provided to form a first section 17a, a second section 17b and a third section 17c, and a first supply port 18 and a first section 18a connected to the three-way solenoid valve 14 are provided above and below the first section 17a, respectively. Two supply ports 19, a first outlet 20 and a second outlet 21 are provided, and a solenoid valve supply port 25 connected to the three-way solenoid valve 14 and a housing supply port connected to the hydraulic pump 4 are provided in the second section 17b. Set up 26 , An outlet 24 connected to the fluid coupling 2 is provided in the third compartment 17c, the piston 12 is arranged in the first compartment 17a, and the valve rod 13 connected to the piston 12 is connected to the communication port 15a, 15b, and the three-way solenoid valve 14 is controlled by the current value of the AC motor 1.

Therefore, since the ON-OFF speed of the three-way solenoid valve 14 can be adjusted, not only the oil amount can be changed smoothly, but also the oil amount can be increased slowly and the current can be stopped by stopping the current quickly. Overshoot can be reduced. In addition, it has a simple structure and can be made compact, and since it can be sandwiched between the flanges of the pipes, it has an effect that the assembly work can be extremely simple.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the structure of an oil quantity control valve in a gas turbine starting device according to the present invention.

FIG. 2 is an operation diagram of the oil amount control valve of FIG.

FIG. 3 is an operation explanatory view of an embodiment of the structure of the oil amount control valve in the gas turbine starting device according to the present invention.

FIG. 4 is a system diagram of a starter for a gas turbine.

FIG. 5A is a partial system diagram when a control valve of a conventional gas turbine starter is used, and FIG. 5B is an operation explanatory view of the same.

FIG. 6 is a partial system diagram when a solenoid valve of a conventional gas turbine starting device is used, and FIG. 6 is an explanatory diagram of the same operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 AC motor 2 Fluid coupling 3 Gas turbine 4 Hydraulic pump 5 Valve body 5a Control valve 5b Solenoid valve 11 Housing 12 Piston 13 Valve rod 14 Three-way solenoid valve 15a, 15b
Communication port 16a, 16b Wall body 17a First section 17b Second section 17c Third section 18 First supply port 19 Second supply port 20 First outlet 21 Second outlet 22a, 22b Adjustment Screw 23 Passage 24 Outflow port 25 Electromagnetic valve supply port 26 Enclosure supply port 27 Oil amount limiting screw

Claims (1)

[Scope of utility model registration request] 1. An AC motor 1 is configured to be connectable to a gas turbine 3 via a fluid coupling 2, and the fluid coupling 2
In a gas turbine starter in which hydraulic oil is supplied from a hydraulic pump 4 to a valve body 5 through a valve body 5, the valve body 5 is communicated with a communication port 15 in a central portion of the housing 11.
The first partition 17a, the second partition 17b and the third partition 1 are provided by providing two wall bodies 16a and 16b having a and 15b.
7c is provided, and a first supply port 18, a second supply port 19, a first outflow port 20, and a second outflow port 21 connected to the three-way port solenoid valve 14 are provided above and below the first section 17a, respectively. , A solenoid valve supply port 25 connected to the three-way port solenoid valve 14 and a housing supply port 26 connected to the hydraulic pump 4 in the second section 17b.
And an outlet 24 communicating with the fluid coupling 2 is provided in the third section 17c, and the first section 17a is provided.
A piston 12 is arranged inside, the valve rod 13 connected to the piston 12 is configured to be inserted into the communication ports 15a and 15b, and the three-way solenoid valve 14 is controlled by the current value of the AC motor 1. Oil quantity control valve in a gas turbine starter configured to operate.