JPH03164534A - Two-shaft type gas turbine for suction pump - Google Patents

Abstract

PURPOSE:To prevent the reverse rotation of a high-speed rotated power turbine shaft positively by providing a reverse rotation impeding device, for impeding the reverse rotation of an intermediate shaft, at the intermediate shaft in a reduction gear for transmitting the rotating force of the power turbine shaft of a gas turbine to an output shaft. CONSTITUTION:A two-shaft type gas turbine for a suction pump is provided with an output turbine receiving high-temperature high pressure combustion gas generated at a gas generator, and the rotating power of this output turbine is transmitted to an output shaft 17 after being reduced to the specified rotating speed by a reduction gear 4. The reduction gear 4 is formed being provided with an intermediate shaft 18, plural gears 21, 29, and the like. In this case, a reverse rotation impeding device 30 for impeding the reverse rotation of the intermediate shaft 18 is fitted at the end part of the intermediate shaft 18. This reverse rotation impeding device 30 is formed of an inner wheel 32 fitted at a protruding part 18a provided at the end part of the intermediate shaft 18, an outer wheel 34 fitted, with play in the relatively rotatable state, at the outer periphery of the inner wheel 32 through a pair of ball hearings 33a, 33b, and a one-way clutch 35 interposed between the inner and outer wheels 32, 34.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a two
This relates to a shaft-type gas turbine.

(Prior Art) When driving a water suction pump without using a commercial power source, a diesel engine is generally used as the prime mover.

By the way, if the valve of the water suction pipe malfunctions and does not close, water will flow backwards when the water suction pump is stopped, causing the prime mover to reverse, damaging bearings and the like.

Conventionally, in boat fishing, the problem has been avoided because a hydraulic clutch or the like has been interposed in the power transmission mechanism between the output shaft of the prime mover and the rotating shaft of the water suction pump.

(Problem to be solved by the invention) Gas turbines are smaller, lighter, and have higher output than diesel engines, and two-shaft gas turbines in particular have optimal output characteristics for driving water intake pumps. . When such a two-shaft gas turbine is used as the prime mover for a water suction pump, if the output shaft is reversed, the oil pump will not operate properly and the power turbine shaft will rotate at high speed without lubricating oil being supplied. The damage is severe and countermeasures against reversal are essential.

However, when a hydraulic clutch is installed in the power transmission mechanism between the output shaft of the prime mover and the rotating shaft of the water suction pump as in the past, the hydraulic clutch becomes large due to the large transmission torque, making it expensive and difficult to install. Requires a lot of space.

Additionally, there are cases where there is no room to install the hydraulic clutch in a location that is convenient for maintenance and inspection, and there has been a strong demand for a countermeasure against reverse rotation on the prime mover side.

(Means for Solving the Problems) In order to solve the above problems, the two-shaft gas turbine for water suction pumps of the present invention includes an output shaft directly connected to the rotating shaft of the water suction pump, an intermediate shaft, and a plurality of gears. The present invention is a two-shaft gas turbine for a water suction pump that includes a speed reduction device that transmits rotational force of a power turbine shaft to the output shaft, and is provided with a reverse rotation prevention device that prevents the intermediate shaft from reversing.

(Function) Even if the output shaft is reversed through the rotating shaft of the water suction pump due to a backflow of water, the reverse rotation prevention device prevents the intermediate shaft from reversing. Therefore, the high speed rotating power turbine shaft does not reverse rotation.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

FIG. 2 is a schematic longitudinal sectional front view of a two-shaft gas turbine for a water suction pump according to an embodiment of the present invention. On the platform 1, which also serves as an oil pan for storing lubricating oil, air is sucked and heated. A gas generator 2 that generates high-pressure combustion gas, an output turbine 3 that extracts rotational power from the combustion gas generated by the gas generator 2, and a reduction gear that reduces the rotational power extracted by the output turbine 3 to a predetermined rotation speed. 4 are arranged in this order from left to right. An auxiliary equipment gear box 5 is attached to the left side surface of the gas generator 2, which accommodates bearings, gears, etc. of various auxiliary equipment.

The gas generator 2 includes an impeller 7 that constitutes the rotor part of a centrifugal compressor that compresses air, and a combustor 8 that creates high-temperature, high-pressure combustion gas by mixing and combusting compressed air and fuel. , a high-pressure turbine rotor 9 that is rotationally driven by combustion gas to rotate the impeller 7, and a low-pressure turbine rotor 10 that is located downstream of the high-pressure turbine rotor 9 and operates in the same manner as the high-pressure turbine rotor 9. . The output turbine 3 includes a power turbine rotor 12 located downstream of the low-pressure turbine rotor 10 and rotated by combustion gas, and a power turbine rotor 12 that is located downstream of the low-pressure turbine rotor 10 and rotates the combustion gas, that is, the exhaust gas after driving the power turbine rotor 12, without generating a vortex. It includes an exhaust differential user 13 for deceleration, an exhaust duct 14 for releasing exhaust gas, a power turbine shaft 15 that rotates integrally with the power turbine rotor 12, and the like. The speed reduction device 4 includes an intermediate shaft 18, a plurality of gears 19 to 22, and the like for reducing the rotational power of the power turbine shaft 15 to a predetermined rotational speed and transmitting the rotational power to the output shaft 17.

The power turbine shaft 15 has one end (the left end in FIG. 2).
by the ball bearing 24, and the other end (the right end in Fig. 2)
are supported by a pair of roller bearings 25g and 25b so as to be rotatable about their respective axes. The intermediate shaft 18 is rotatably supported around the axis by a pair of roller bearings 26a, 26b, and the output shaft 17 is supported by a pair of roller bearings 27a, 27b.
It is rotatably supported around its axis. gear 19
is fitted and fixed on the outer periphery of the female end of the power turbine shaft 15 and meshes with a gear 20 that is fitted and fixed on the outer periphery of one end of the intermediate shaft 18 . The gear 21 is provided on the outer periphery of the female end of the intermediate shaft 18, and the gear 22 is fixed to one end of the output shaft 17.
It meshes with the A reverse rotation prevention device 30 is attached to the other end of the intermediate shaft 18 to prevent the intermediate shaft 18 from rotating in reverse.

FIG. 1 is an enlarged cross-sectional plan view of the essential parts of a two-shaft gas turbine for a water suction pump according to an embodiment of the present invention.
0 is an inner ring 32 that is key-fitted to the outer periphery of a protrusion 18a that is concentrically and integrally protruded from the other end of the intermediate shaft 18, and an outer periphery of the inner ring 32 via a pair of ball bearings 33a and 33b. It is composed of an outer ring 34 that is loosely fitted in a relatively rotatable manner, and a package type one-way clutch 35 that is interposed between the inner ring 32 and the outer ring 34. The outer ring 34 is attached to a bracket 37 with a plurality of bolts 36, and the bracket 37 is attached to the gearbox body 3 with a plurality of bolts 38.
It is attached to 9. A plurality of bolts 40 are attached to the outer ring 34.
A cover unit 40b is attached by a.

FIG. 3 is a schematic configuration diagram of water pumping equipment that employs a two-shaft gas turbine for a water suction pump according to an embodiment of the present invention. The output side shaft 45 of the bevel gear reducer 43 is connected to a connecting shaft 46.
It is connected to a rotating shaft 48 of a water suction pump 47 via. One end of a water discharge pipe 49 is connected to the discharge side of the water suction pump 47, and the other end of the four water discharge pipes is connected to a water tank for processing, for example.
(not shown) etc. The water suction pump 47 is arranged in the tank of the water pumping base. Rotating shaft 4 of water suction pump 47
8 penetrates the vertical part of the water discharge pipe 49. Although not shown, on-off valves are installed at appropriate locations on the water discharge pipe 49.

Next, the operation will be explained. During operation of the two-shaft gas turbine 41, the rotational force of the power turbine shaft 15, which rotates together with the power turbine rotor 12, is transmitted to the intermediate shaft 18 via the gear 19.20, and is further transmitted to the output via the gear 21.22. It is transmitted to the shaft 17 and further transmitted to the rotating shaft 48 via the bevel gear reducer 43 and the connecting shaft 46, and the water suction pump 47
is driven. At this time, the intermediate shaft 18 rotates in the forward direction, so the reverse rotation prevention device 30 does not prevent the intermediate shaft 18 from rotating.

If the on-off valve of the water discharge pipe 49 fails and does not close, when the operation of the two-shaft gas turbine 41 is stopped, the water discharge pipe 4
Water flows backward through the pump 9, and torque in the reverse direction is applied to the rotating shaft 48 of the water suction pump 47. This torque is transmitted to the output shaft 17 of the two-shaft gas turbine 41 via the connecting shaft 46 and the bevel gear reducer 43, and further transmitted to the intermediate shaft 18 via the gears 22 and 21. As a result, the intermediate shaft 18 attempts to reverse, but the one-way clutch 35 of the reverse rotation prevention device 30 firmly prevents the intermediate shaft 18 from reversing.

Therefore, the power turbine shaft 15 does not rotate in the opposite direction, and the ball bearing 24 and roller bearings 25a and 25b are not damaged.

At this time, since the intermediate shaft 18 does not rotate, the output shaft 17 and the rotating shaft 48 of the water suction pump 47 also do not rotate.

Note that the idler gear 29, which is rotatably supported around the axis by a pair of bearings 28a and 28b, is for switching the rotation direction of the output shaft 17, and the gear 21 and the gear 29 are connected to each other without using two idler gears. 22, the output shaft 17 rotates in the same direction as the power turbine shaft 15 when the two-shaft gas turbine 41 is in operation. If the installation position of the intermediate shaft 18 is slightly shifted so that the gear 21 does not mesh with the gear 22 but meshes with the idler gear 29, the intermediate shaft 1
8 is transmitted to the output shaft 17 via the idler gear 29, the output shaft 17 rotates in the opposite direction to the power turbine shaft 15 when the 21d1 type gas turbine 41 is operating.

As described above, since the reverse rotation prevention device 3o is configured to prevent the intermediate shaft 18 from reversing, it is possible to economically prevent the power turbine shaft 15 from reversing, and the output shaft 17 and the water suction pump 4 can be prevented from reversing.
7 can be directly connected to the rotating shaft 48 without any problem. In other words, reverse rotation prevention lF: If an attempt is made to directly prevent the reverse rotation of the power turbine shaft 15 using the device 3o, the ball bearings 33a, 3 of the reverse rotation prevention device 30 will
3b also needs to be made of a special material that can withstand it.
The cost becomes high. There is no space around the power turbine shaft 15 to install the reverse rotation prevention device 3o. Further, if the reverse rotation prevention device 3o is used to prevent the output shaft 17 from reversing, the output shaft 17 has a low speed and a large torque, so the reverse rotation prevention device 3o becomes large and expensive.

(Another Embodiment) In the above embodiment, the one-way clutch 35 was used as the reversal prevention device 3o, but the present invention is not limited to such a configuration. You may also use

(Effects of the Invention) As explained above, according to the present invention, since the reverse rotation prevention device is configured to prevent the intermediate shaft from reversing, it is possible to economically prevent the power turbine shaft from reversing. It can be directly connected to the rotating shaft of the In other words, if an attempt is made to directly prevent the power turbine shaft from reversing using a reverse rotation prevention device, the power turbine shaft rotates at high speed, so special bearings and the like for the reverse rotation prevention device must be used to withstand the high speed rotation, resulting in high costs. . Moreover, there is no space around the power turbine shaft to install a reverse rotation prevention device. Further, if an attempt is made to prevent the output shaft from reversing with a reverse rotation prevention device, the output shaft has a low speed and a large torque, so the reverse rotation prevention device becomes large and expensive. The present invention solves these problems all at once.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional plan view of essential parts of a two-shaft gas turbine for a water suction pump according to an embodiment of the present invention, FIG. 2 is a schematic longitudinal sectional front view of the two-shaft gas turbine for a water suction pump, and FIG. It is a schematic block diagram of the water pumping equipment which adopted the two-shaft gas turbine for the water suction pump.

Claims (1)

[Claims] 1. For a water suction pump, which is equipped with an output shaft directly connected to the rotating shaft of the water suction pump, and a reduction gear that includes an intermediate shaft and a plurality of gears and transmits the rotational force of the power turbine shaft to the output shaft.
A two-shaft gas turbine for a water suction pump, characterized in that the shaft-type gas turbine is provided with a reverse rotation prevention device that prevents the intermediate shaft from reversing.