JP3364129B2 - L-shaped vertical gas turbine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an L-shaped vertical gas turbine, and reduces the installation space by reducing the shape of an intermediate duct connecting the gas generator and the gas turbine. It has a shape that can be used. 2. Description of the Related Art An L-shaped vertical gas turbine main body has a gas generator installed horizontally and an output turbine installed vertically (vertical shaft), and both of them have an L-shaped intermediate portion serving as a working gas passage. They are connected by ducts. Such an L-shaped vertical gas turbine has begun to be used to drive a centrifugal pump, an axial pump, and the like. FIG. 4 is a side view showing an example of a conventional L-shaped gas turbine, FIG. 5 is a plan view thereof, and FIG. 6 is a perspective view of a scroll casing used in the L-shaped gas turbine. is there. In these figures, reference numeral 40 denotes a gas turbine, which is a gas generator 41 for generating high-temperature and high-pressure gas.
And an output unit 60 following the above. The gas generator 41 raises the pressure of the air flowing in from the intake port by a compressor, guides the air to a combustion chamber, and drives the compressor using a high-temperature and high-pressure gas generated in the combustion chamber as a power (not shown). ) Is rotated so that the axle of the gas generator is parallel to the reference plane L of the base 62. [0004] The output section 60 is provided with an output turbine 47, and an output shaft 50 is installed so as to be parallel to a shaft 51 for driving a lower pump and the like. Have been. Exhaust port 41 of gas generator 41
A scroll casing 44 is provided in the middle of the gas jet that communicates between a and the cascade 48 of the output turbine 47. Gas generator 41 and scroll casing 44
Has a structure that can be separated by the support portion 52. As shown in the perspective view of FIG. 6, the scroll casing 44 forms an annular scroll flow path 45 surrounding the output shaft 50, and controls the flow of gas generated along the axis of the gas generator 41. The power turbine 47 is turned in a direction along the axle. The scroll channel 45 is
An inlet 43 that opens in the horizontal direction faces the exhaust port 42 of the gas generator 41, and an outlet 46 faces a cascade 48 of the output turbine 47. The scroll casing 44 is supported by an output turbine support 52, and an output turbine bearing base 61 is provided below the scroll casing 44. A bearing device (not shown) for supporting the weight of the output turbine 47 and the output shaft 50 in addition to the thrust generated by the operation of the output turbine is installed inside the output turbine bearing stand 61. An exhaust duct 63 is provided above the scroll casing 44. In the L-shaped vertical gas turbine having the above-described structure, the high-temperature and high-pressure gas generated by the gas generator 41 is ejected from the exhaust port 42 in the horizontal direction, and flows into the scroll passage 45 of the scroll casing 44 from the inlet 43. I do. The high-temperature and high-pressure gas that has flowed into the scroll flow channel 45 spreads annularly around the output turbine 47 axle along the scroll flow channel 45, and flows along the inner peripheral surface shape in the scroll flow channel 45 while passing through the axle of the output turbine 47. The flow direction is changed in the direction of the
Towards blade row 48 ejected to drive the output shaft 50 by turning the power turbine 47. The output shaft 50 rotates the pump drive shaft 51 via the high-speed reducer 49 to drive the axial flow pump. FIG. 7 is a perspective view showing an outer shape of an intermediate duct in a flow path portion between a gas generator and an output portion in the conventional L-shaped gas turbine having the above-mentioned structure.
, 71 is an upper intermediate duct, and 72 is a horizontal intermediate duct. Outer horizontal intermediate duct 72 is connected to the gas generator, the working gas G ₃ from the gas generator flows into the scroll casing 44, uniform (flow rate, vectors) in the inlet portion of the power turbine it is necessary to direct the gas to flows is divided into right and left large flow paths of diameter D _2, uniformly outflow flow uniformly and allowed Yodoma circumferentially flows in the vertical direction from, the smaller the outer diameter d ₂ turbine inlet diameters in the circumferential direction I am trying to do it. For this purpose, the conventional intermediate duct has a swelling in the scroll casing 44 to provide a flow path with a uniform width around the periphery. As a result, the outer diameter of the scroll casing is increased, resulting in a larger installation area. [0008] As described above, the conventional L
The shape of the intermediate duct of the vertical gas turbine is such that the gas flow at the inlet of the power turbine is uniform in the circumferential direction,
In order to supply a uniform working gas to the output turbine, a scroll casing 44 is provided, and the working gas is once put into a room having a large flow path area with an outer diameter and supplied to the output turbine 47. Therefore, the external shape of the intermediate duct becomes large, the installation area of the entire gas turbine becomes large, the installation area becomes large, and it has been desired to reduce this. In view of the above, the present invention aims to reduce the installation area of an L-shaped gas turbine including an output turbine and a gas generator connected to the intermediate duct by devising the shape of the intermediate duct. The task was to make it possible. [0010] The present invention provides the following means to solve the above-mentioned problems. A gas generator having a rotation axis in the horizontal direction;
An output turbine having a rotating shaft in a vertical direction, an output turbine arranged vertically, and an outlet side of the gas generator connected to a vertical inlet side of the output turbine, and the gas generated from the gas generator is rotated by the rotation. in the L-Vertical gas turbine comprising an intermediate duct for sending from the periphery of the shaft to the power turbine, the intermediate duct by flowing a gas generated from the gas generator from the left and right directions, in the surrounding said rotary shaft
L wherein the outer diameter of the intermediate duct is equal to or less than the outer diameter of the gas inlet of the output turbine.
Vertical gas turbine. [0012] The L-shaped intermediate duct connecting the gas generator and the output turbine of the L-shaped vertical gas turbine of the present invention includes:
Gas generated from the gas generator flows in from two directions, left and right. For this reason, the gas flows in the circumferential direction from both sides, has a substantially uniform distribution in the circumferential direction, flows upward in the vertical direction without stagnating around, and flows into the output turbine. In the conventional intermediate duct, the gas flowing from the gas generator flows in from one inflow port, forms a scroll flow path around the output shaft, and once stagnates around the output shaft, creates a uniform flow around the output turbine. Formed and supplied to the turbine. For this reason, the scroll casing forming the scroll flow path expands around and the intermediate duct has a large shape, but in the present invention, the flow path at the inlet is separated into right and left,
It is possible to supply a substantially uniform gas flow to the output turbine without forming a scroll flow path, and the size of the intermediate duct can be reduced accordingly because the scroll flow path is unnecessary. By making the intermediate duct smaller than before, the installation area of the entire L-shaped vertical gas turbine connecting the gas generator and the output turbine becomes smaller than before, and it can be used as a maintenance space accordingly. Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a sectional view of an L-shaped vertical gas turbine according to one embodiment of the present invention. In the figure, an output turbine 1 includes an outer casing 2
The output shaft 3 is arranged vertically, and the high-temperature combustion gas is sent from the gas generator 5 through the intermediate duct 7 and is driven to rotate. A shaft such as a pump is connected to a shaft connecting portion 4 at a lower end of the output shaft 3 and driven. [0014] Intermediate duct 7 is sealed from the outside by the intermediate duct outer casing 6, together with the seal, between the intermediate duct 7 and the intermediate duct outer casing 6 connecting unit 1
2, 13 are connected. A supporting portion flange 11 is connected to the outer connecting portion 12, and the supporting portion flange 11 is fixed to the base plate 8 by the supporting portion 10 and supported. The support portion 10 is connected to the support portion flange 11 and the connecting portion 12, but is attached at a predetermined distance from the outer peripheral surface of the intermediate duct outer casing 6 as shown in the figure. The support portion 10 is provided with a predetermined interval between the support portion flange 11 and the connecting portion 12 and the intermediate duct outer casing 6
, And supports the output turbine 1 on the base plate 8 via the intermediate duct outer casing 6. The support 1
0 is provided at several places in the circumferential direction. For this reason, consideration is given so that the support portion 10 is not affected even when the temperature of the outer casing 6 of the intermediate duct becomes high due to the extraction of compressed air from the compressor for sealing. FIG. 2 is a perspective view showing the outer shape of the intermediate duct 7 of the L-shaped vertical gas turbine described in FIG. As shown in the drawing, the intermediate duct 7 has a gas inlet side (outer diameter D ₁ ) 21 connected to the gas generator 5 and a gas outlet side (outer side d ₁ ) 22 connected to the output turbine 1. The inflowing gas is divided into _two flows G ₁ and G ₂ as described later, and flows in from the left and right, respectively, and the gas flows G ₁ and G ₂ flow to the surroundings without providing a conventional scroll flow path. Instead, they flow vertically toward the output turbine. As described above, the intermediate duct 7 does not have a scroll flow path around it, and gas flows vertically, and the diameter of this portion is substantially equal to the outer diameter d ₁ of the gas outlet side 22. The horizontal length L from the gas inlet side 21
₁ can be made shorter than the length L ₂ of the conventional intermediate duct shown in only FIG. 7 part of the width of the scroll passage. FIG. 3 shows a horizontal cross section of the intermediate duct 7 of the present embodiment described above and a conventional intermediate duct, and compares the outer shapes. FIG. 3A shows the intermediate duct of the present invention.
(B) shows a conventional intermediate duct. In the conventional intermediate duct of (b), the flow path of the scroll casing 44 is formed around the intermediate duct, and the outer diameter D ₂ is larger than the outer diameter d ₂ of the flow path connected to the upper output turbine side. . On the other hand, in the intermediate duct of the present invention shown in FIG. 3 (a), the gas flow path branches right and left as shown by 7a and 7b, and the gas flows in the circumferential direction from the left and right. without need circumferentially scroll passage of the formed uniform flow around, well outside d ₁ side outer diameter of the intermediate duct flowing into almost power turbine because it flows perpendicularly, d ₁ < D _2, and the it is possible to reduce the outer diameter than the prior art. Next, Table 1 shows a comparison of the outer dimensions of the intermediate duct 7 of the present invention and the conventional intermediate duct. The lengths L _X and L _Y are compared with an outer diameter D of 1.0. In comparison with the case 1 and the case 2 of the conventional example, the length of the intermediate duct of the present invention is equal to the length of the scroll channel,
It can be seen that L _X has become shorter. [Table 1] According to the present invention, an L-shaped vertical gas turbine according to the present invention includes a gas generator having a rotating shaft in a horizontal direction, an output turbine having a rotating shaft in a vertical direction, and a vertically arranged output turbine. An intermediate duct that connects an outlet side of the gas generator and a vertical inlet side of the output turbine and sends gas generated from the gas generator to the output turbine from around the rotation shaft;
In the vertical gas turbine, the intermediate duct allows gas generated from the gas generator to flow in two directions from left and right.
Thus , the outer diameter of the intermediate duct around the rotation shaft is equal to or less than the outer diameter of the gas inlet of the output turbine. With such a configuration, the horizontal length of the intermediate duct forming the L-shape does not need to be provided with a scroll flow path as in the conventional case, and the length can be shortened by that much compared to the conventional case. Therefore, the installation area of the L-shaped vertical gas turbine in which the gas generator and the output turbine are connected to the intermediate duct can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an L-shaped vertical gas turbine according to an embodiment of the present invention. FIG. 2 is a perspective view of an intermediate duct of the L-shaped vertical gas turbine according to the embodiment of the present invention. 3A and 3B show a comparison between an intermediate duct of an L-shaped vertical gas turbine of the present invention and a conventional intermediate duct, wherein FIG. 3A shows an intermediate duct of an embodiment of the present invention, and FIG. FIG. FIG. 4 is a side view of a conventional L-shaped vertical gas turbine. FIG. 5 is a plan view of the conventional L-shaped vertical gas turbine shown in FIG. FIG. 6 is a perspective view of a scroll casing of the conventional L-shaped vertical gas turbine shown in FIG. FIG. 7 is a perspective view showing an intermediate duct of a conventional L-shaped vertical gas turbine. [Description of Signs] 1 Output turbine 2 Outer casing 3 Output shaft 5 Gas generator 6 Intermediate duct outer casing 7 Intermediate duct 8 Base plate 10 Support section 11 Support section flange 12 Connection section 21 Gas inlet side 22 Gas outlet side

Continuation of the front page (56) References JP-A-9-96290 (JP, A) JP-A-8-296456 (JP, A) JP-A-9-189240 (JP, A) , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02C 1/00-9/58

Claims (1)

(57) [Claims 1] A gas generator having a shaft in a horizontal direction, an output turbine having a rotating shaft in a vertical direction and arranged vertically, and an outlet side of the gas generator And an intermediate duct for connecting a gas generated by the gas generator to the output turbine from around the rotary shaft to the output turbine, the L-shaped gas turbine comprising: The duct is configured to allow the gas generated from the gas generator to flow in two directions from the left and right, so that the
L wherein the outer diameter of the intermediate duct is equal to or less than the outer diameter of the gas inlet of the output turbine.
Vertical gas turbine.