JPH05122904A - Cooling apparatus of valve turbine generator - Google Patents

Abstract

PURPOSE:To fill the gap between a frame and an armature core with a magnetic fluid in such a manner as to exclude mechanical restriction of the armature core on thermal expansion to conduct heat exchange through the magnetic fluid. CONSTITUTION:An armature core 2 is supported expandably and compressively between the stator frames 9 via a plurality of bars 10 both ends thereof being coupled with the stator frames 9 fixed to a frame 3, non-magnetic seals 7 having elasticity are provided at the internal side of the stator frames, a gap between the seals 7 is filled with a magnetic fluid 8, and when a generator operates, the magnetic fluid 8 is stirred with a rotating magnetic field leaked from the armature core 2 to cool the armature core 2 through heat exchange between the frame 3 and armature core 2. Even while the generator stops operation, the magnetic fluid 8 remains within the seals 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for cooling an armature core of a valve turbine generator via a magnetic fluid.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view of a conventional valve turbine generator. In FIG. 3, the valve turbine generator has a generator, which is sealed in a valve composed of the frame 3, in a tubular water passage 15 on the upstream side of the turbine runner 13, and river water flows around the generator. The generator is composed of an armature 1 and a rotor 12, and a turbine runner 13 is connected to a shaft 12a of the generator. When the water turbine runner 13 rotates, electric power is generated from the generator. The armature 1 is attached to a stator frame 9 fixed to the frame 3. A plurality of cooling pipes 14 arranged in the flowing direction on the outer periphery of the frame 3 and projecting into the water channel 15,
The air partition plate 16 and the blower 17 are provided. Blower 17
The wind sent out from the cooler cools the rotor 2 and the armature 1, and the warmed wind passes through the cooling pipe 14 penetrating the frame 3, where it is cooled by the river water, and the outside of the wind partition plate 16 is cooled. Return to the blower 17 through the space. The wind then circulates in the valve in the same way. 4 is running water, and 5 is an armature winding.

FIG. 4 is a longitudinal sectional view showing a part of another conventional valve turbine generator. 4, the same parts as those in FIG. 3 are designated by the same reference numerals. In the example of FIG. 4, the armature core 2 is directly fixed to the inner diameter side of the frame 3 by welding or the like, heat transfer between the frame 3 and the armature core 2 is improved, and the heat of the armature core 2 is dissipated. I am trying. Since the heat generated in the armature winding 5 cannot be dissipated by this mechanism, a cooling wind 6 is generated by the fan and the heat is taken in a path different from that of the armature core 2. However, when the armature core 2 is thermally expanded while the outer periphery of the armature core 2 is constrained by the frame 3, stress is applied to the inside of the armature core 2 and the armature core 2 is damaged.

FIG. 5 is a longitudinal sectional view showing a part of a valve turbine generator having a cooling device according to another conventional example. In the example of FIG. 5, the armature core 2 is prevented from being damaged by thermal expansion,
A space is provided between the frame 3 and the armature core 2, and is supported by a stator frame 9 having a flexible structure that absorbs or alleviates expansion of the armature core 2, and is supported between the frame 3 and the armature core 2. The seal 7 made of a non-magnetic material is provided, the space is filled with the magnetic fluid 8, and the heat of the armature core 2 is transferred to the frame 3 via the magnetic fluid 8 to cool the armature core 2. ..

[0005]

In order to improve the heat conduction between the frame 3 and the armature core 2 of the valve turbine generator and to eliminate the mechanical restraint against thermal expansion, the frame 3 and the armature core 2 are eliminated. When the magnetic fluid 8 is filled between
When the generator is operated, the magnetic fluid 8 is stirred in the circumferential direction by the action of the rotating magnetic field leaking from the armature core 2, and the heat of the armature core 2 is transferred to the frame 3, so that the cooling effect is improved, but the valve turbine is used. When the generator stops, the rotating magnetic field disappears and the force that restrains the magnetic fluid does not act, so the magnetic fluid 8 may leak from the gap.
Is provided. However, when the seal 7 is strengthened, the seal 7 restrains between the armature core 2 and the frame 3,
There is a problem that the thermal expansion of the armature core 2 cannot be absorbed.

According to the present invention, a magnetic fluid is filled between the frame and the armature core so as to eliminate mechanical restraints on the thermal expansion of the armature core, and the magnetic fluid is filled between the frame and the armature core during operation of the generator. An object of the present invention is to provide a cooling device for a valve turbine generator in which heat is exchanged through the armature core to cool the armature core and magnetic fluid does not flow out even when the generator is stopped.

[0007]

A space between a frame containing a rotor and an armature and an armature iron core is filled with a magnetic fluid, and the space between the armature iron core and the frame is filled with the magnetic fluid. In a cooling device for a valve turbine generator that cools the armature core by exchanging heat with, the armature core is fixed through a plurality of bars whose both ends are connected to a stator frame fixed to the frame. A seal made of a non-magnetic material having elasticity is provided at both ends in the axial direction of the stator frame, which is elastically supported between the child frames, and between the frame and the armature core. The above object is achieved by filling the space between them with a magnetic fluid.

Further, a magnetic fluid is filled in a space between a frame containing a rotor and an armature and an armature core, and heat is exchanged between the armature core and the frame via the magnetic fluid. In a cooling device for a valve turbine generator that cools the armature core by means of a plurality of bars whose both ends are coupled to a stator frame fixed to the frame, the armature core is placed between the stator frames. And a plurality of permanent magnets disposed inside the stator frame and on the inner diameter side of the frame, and between the frame and the armature core between the two stator frames. The above object is achieved by filling the space with magnetic fluid.

[0009]

According to the present invention, the armature core is supported by a stator frame fixed to the frame so as to be capable of expanding and contracting in the axial direction, and at the inner ends of the stator frame, elastic nonmagnetic materials are used. Since a magnetic fluid is filled in the space between the frame and the armature core between both seals, the rotating magnetic field leaking from the armature core acts when the generator is operated, and the magnetism inside the seal The fluid is stirred and heat is exchanged between the armature core and the frame, so that the armature core can be cooled. Moreover, when the generator is stopped, the magnetic fluid remains in the seal and does not leak.

According to the present invention, the armature core is supported between the stator frame fixed to the frame so as to extend and contract in the axial direction, and a plurality of permanent magnets are provided inside the stator frame and on the inner diameter side of the frame. Since it was provided and the space between the frame between both stator frames and the armature core was filled with magnetic fluid,
The magnetic fluid is restrained by the magnetic field of the permanent magnet, and the magnetic fluid stably stays in the space inside the stator frame. Furthermore, when the generator is operated, the rotating magnetic field leaking from the armature core is superimposed on the magnetic field of the permanent magnet, but if the magnetic field of the permanent magnet is set weaker than the magnetic field of the armature core, While the generator is running, the rotating magnetic field leaking from the armature core becomes dominant,
The magnetic fluid can be agitated and heat-exchanged between the armature core and the frame to cool the armature core.

[0011]

Embodiment 1 FIG. 1 is a vertical sectional view showing a part of a valve turbine generator equipped with a cooling device according to a first embodiment of the present invention. 1, the same parts as those in FIG. 4 are designated by the same reference numerals. In the cooling device according to the first embodiment of the present invention, the armature core 2 is inserted between the stator frames 9 fixed to the frame 3, and the bars 10 are respectively inserted into the grooves of the armature core 2, Both ends of the bar 10 are fixed to the stator frame 9 so that when the armature core 2 expands or contracts, the armature core moves and absorbs in the groove. Further, a seal 7 made of a non-magnetic material having elasticity such as rubber, brass, or stainless is provided at both ends of the stator frame 9 in the axial direction. The magnetic fluid 8 was filled in the space.

The magnetic fluid 8 freely flows inside the seal 7. When the generator is stopped, the magnetic fluid 8 stays in the seal 7 and does not leak from the seal 7. When the generator operates, the magnetic fluid 8 rotates in the seal 7 in the circumferential direction and is agitated by the action of the rotating magnetic field leaking from the armature core 2. The stirred magnetic fluid 8 is the armature core 2
And the frame 3 are heat-exchanged to cool the armature core 2.

Embodiment 2 FIG. 2 is a vertical sectional view showing a part of a valve turbine generator equipped with a cooling device according to a second embodiment of the present invention. 2, the same parts as those in FIG. 1 are designated by the same reference numerals. In the cooling device according to the second embodiment of the present invention, the armature core 2 is arranged between the stator frames 9 fixed to the frame 3, and the bars 10 are inserted into the plurality of grooves of the armature core 2. , Both ends of the bar 10 are fixed to the stator frame 9, and the armature core 2
When is expanded or contracted, the armature core moves in the groove and is absorbed. Further, a plurality of permanent magnets 11 are attached inside the stator frame 9 and on the inner diameter side of the frame 3, and the magnetic fluid 8 is placed in the space between the frame 3 and the armature core 2 between the two stator frames 9. Filled.

When the generator is stopped, the magnetic fluid 8
Is constrained by the magnetic field of the permanent magnet 11, and the magnetic fluid 8 stably stays in the space inside the stator frame 9. If the magnetic field of the permanent magnet 11 is set weaker than the magnetic field of the armature core 2,
When the generator is operated, the rotating magnetic field leaking from the armature core 2 becomes dominant, the magnetic fluid is agitated, and the armature core 2 is stirred.
And heat is exchanged between the frame and the frame 3. In this way, the armature core 2 can be cooled.

[0015]

According to the present invention, the armature core is stretchably supported between the stator frames, and a seal made of a nonmagnetic material having elasticity is provided between the armature core and the frame. The space between the frame between the seal and the armature core was filled with magnetic fluid, and the magnetic fluid did not leak due to the seal.Therefore, when the generator was operated, the rotating magnetic field leaking from the armature core was The magnetic fluid is agitated in the seal, heat is exchanged between the frame and the armature core, and the armature core can be efficiently cooled.

According to the present invention, the armature core is stretchably supported between the stator frames, a plurality of permanent magnets are provided on the inner diameter side of the frame, and the frame between the stator frames and the armature core are provided. Since the space between and was filled with magnetic fluid,
The magnetic fluid of the permanent magnet allows the magnetic fluid to remain between the frame and the armature core. When the generator is operated, the rotating magnetic field leaking from the armature core becomes dominant, the magnetic fluid is agitated, heat is exchanged between the armature core and the frame, and the armature core is cooled efficiently. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a part of a valve turbine generator equipped with a cooling device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a part of a valve turbine generator including a cooling device according to a second embodiment of the present invention.

FIG. 3 is a vertical sectional view of a conventional valve turbine generator.

FIG. 4 is a vertical sectional view showing a part of another conventional valve turbine generator.

FIG. 5 is a longitudinal sectional view showing a part of a valve turbine generator including a cooling device according to another conventional example.

[Explanation of symbols]

 2 Armature iron core 3 Frame 5 Armature winding 7 Seal 8 Magnetic fluid 9 Stator frame 10 Bar 11 Permanent magnet

Claims (2)

[Claims] 1. A magnetic fluid is filled in a space between a frame containing a rotor and an armature and an armature core, and heat is exchanged between the armature core and the frame via the magnetic fluid. In a cooling device for a valve turbine generator that cools the armature core by means of a plurality of bars whose both ends are coupled to a stator frame fixed to the frame, the armature core is placed between the stator frames. And a seal made of a non-magnetic material having elasticity at both ends in the axial direction inside the stator frame, and the space between the frame and the armature iron core between the both seals. A cooling device for a valve turbine generator, which is filled with magnetic fluid. 2. A magnetic fluid is filled in a space between a frame containing a rotor and an armature and an armature core, and heat is exchanged between the armature core and the frame via the magnetic fluid. In a cooling device for a valve turbine generator that cools the armature core by means of a plurality of bars whose both ends are coupled to a stator frame fixed to the frame, the armature core is placed between the stator frames. And a plurality of permanent magnets disposed inside the stator frame and on the inner diameter side of the frame, and between the frame and the armature core between the two stator frames. A cooling device for a valve turbine generator, characterized in that the space is filled with magnetic fluid.