JPS58218851A - Internally cooled turbine generator - Google Patents

Abstract

PURPOSE:To reduce power driving a blower by inclining the injection hole of a center wedge in the direction opposite to the direction of rotation of a rotor. CONSTITUTION:Hydrogen gas for cooling flows to the duct 1c of a rotor coil 1b formed by stacking conductors of concave sections in a slot between the core ties 1a of the rotor, and is injected in the radial direction of the rotor from the injection hole of the center wedge 1d. The injection hole H of the center wedge 1d is formed inclined in the direction opposite to the direction of rotation R regarding the direction of inflow A1 of the gas, the radial direction N of the rotor. Accordingly, energy required for turning the blower can be reduced because the force of gas injection is changed into force required for rotating the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an internally cooled turbine generator, and particularly relates to an internally cooled turbine generator that has been improved in the treatment of cooling gas.

In the ventilation circuit of a conventional internally cooled turbine generator, as shown in FIG. 1, a rotor 1, a stator core 2? 7. A blower 4 and a cooler 5 are provided in a frame 3 to accommodate the blower 4 and a cooler 5. E1. Therefore, the hydrogen gas in the sealed frame is drawn into the cooler 5 as the rotor 1 rotates; the low-temperature gas cooled by the cooler 5 passes through the upper part of the frame 3 from the turbine side; The low-temperature gas flowing in the radial direction from the inner peripheral side of the coil end portion of the rotor 1 is sequentially distributed to each layer of coils. The arrow shows the low-temperature gas flow, and the arrow B shows the high-temperature gas flow. 〇 Coil configuration of rotor l Ui 2 As shown in the diagram, a concave conductor with WI[th+ is superimposed in the slot between the core teeth 1a. A hydrogen gas flow flows through the duct 1c of the rotor coil lb formed in the same manner as shown in FIG. On the other hand, it became a jetting load,
Vent tube 3 is connected to the low temperature gas passing above the frame 3.
through which the stator coil 2 is cooled and the rotor 1
The one that cools the rotor coil 1b is sprayed from the left side through the duct) lc, and is emitted from the injection hole of the center wedge 1d, and then goes back to the cooler 5 and the blower 4.
0 As mentioned above, the ventilation circuit of a conventional internally cooled turbine generator is based on the rotor coil lb? The cooled scum flows from the injection hole of the center wedge 1d to the radial direction of the rotor 1 for 100 m/
The jet is configured to be injected at a flow rate of about 500 yen, so that it can be sucked into the blower 4 again without being affected by the rotational force of the rotor 1.

(7) Invention 2. In view of the above points, the injection holes of the center wedge are arranged in a direction opposite to the rotating direction of the rotor in order to convert the kinetic energy of the gas injected from the injection holes of the center wedge into rotational torque of the rotor. The purpose of this invention is to provide an internally cooled turbine generator that reduces the power required to rotate a blower for ventilation. , in FIG. 3, the injection hole Hv of the center wedge 1d
f-, gas inflow direction A1, that is, rotor radial direction N
It is formed so as to be inclined in a direction opposite to the rotational direction R. With this configuration, the conventional A2
Direction 71 r) The A3 direction will be taken.0 The above effect 7 (*41N) shows that the bottom part A of the cooling gas injection direction is tilted in the opposite direction to the rotor rotation direction R.
The OS component A'3 is the component in the circumferential direction.

Acts as a force that propels the rotor in the rotational direction R (0, therefore, the rotor torque applied from the outside is reduced). Calculate the amount of energy saved if the direction is tilted in the opposite direction to the rotational direction R. 0ρ is the density of the fluid 1, U is the relative speed of the fluid, Q?
Assuming the flow rate, the force F exerted by the fluid is expressed as % F = 'ρUQ 0 Here, the fluid has a gas pressure of 4Kg/cm2
(D Water E Te S Reha p = o, so Kg/m3
/9. am/sec”=o, o s 7Kg,
Assuming that the gas is injected at a speed of see/m * too m/see, LJ'' 258m IQ = 40
0 m/min = e, 7 m/sec, and 1 F = 0.051 x 258 x 6. '7
-F 88. It will be 2 kg. If the rotational torque T is 1m in rotor diameter, then T==88.2X0.5=44.1Kg-m,
Work wrr.

W = O) T = 2 x 3.14 x 60
X 44.1416617 K g 'm/ 8 e.

Tona, 6o k l Kg m/ 5ec=9.
8 x 10 KW relationship? When converted to KW Ic, w + 1. : '62.8 KW can be obtained 0 Compared to all conventional blowers, the blower's conventional ventilation power a was about 1000 KW in the above class, so the ratio of the two is 162.8 ÷ 1000. X 100 = 16.28
(%).In other words, according to this invention, the b energy required to rotate the blower can be saved by 16% compared to the conventional one. The fuel cost of the generator, which drives the turbine in both load and no-load operation, can be reduced completely.

[Brief explanation of the drawing]

Figure 1 shows the ventilation circuit of the machine starting from the cooling turbine 5a. 2 is a cross-sectional perspective view of a part of a conventional rotor coil, and FIG. 3 is a cross-sectional view of a main part of an embodiment of the present invention. FIG. 4 μ is also a diagram 1 for explaining the operation. In the diagram, 1... rotor, 1 &... core teeth, lb
...rotor coil, 'IO...duct, ld...
Center wedge, H...Injection hole, 2...Stator 7mi 3...Frame, 4...Blower, 5...
Cool and clear. Agent Satoru Kuzuno

Claims (1)

[Claims] In an internally cooled turbine generator that is driven by a blower that sucks cooling gas and sends it to the cooling means, the entire rotor shaft is driven, and the gas injection hole provided in the center wedge is connected to the duct formed by the rotor coil, and the gas injection hole is installed in the direction opposite to the rotational direction of the rotor. An internally cooled turbine generator characterized by being formed so as to be tilted in a direction.