JPS60148355A - Seal device for rotating electrical machine cooling equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention prevents leakage of a cooling medium in a rotating electric machine in which cooling is performed by circulating a cooling medium such as a cooling liquid or a cooling gas inside a rotating shaft. The sealing device i't is shown in FIG.

(Prior art) Rotating electric machines, especially machine tools! In high-speed rotating electric machines used for Ill, etc., when cooling is performed by circulating a cooling medium in the rotation shaft, there is leakage from the rotating shaft to other than the υ1 outlet, so that the cooling medium can be effectively recovered. It is necessary to provide a seal between the rotating shaft and the fixed part.For this purpose, mechanical seals are generally used, but they cause friction and heat generation at the contact area between the sealing hole and the fixed part or the rotating part.
If the rotation speed is high, wear will be significant, shortening the life of the seal and generating a large amount of heat, so this contact area is cooled separately, which has the disadvantages of making the seal structure cumbersome and large. be.

(116 Structure and Object of the Present Invention) The present invention provides a 1111 structure between the rotation+IUI+ and the identification section.
A screw seal is provided through the gap, and a seal ring is movably supported in the axial direction on the identification side opposite to the seal disk attached to the rotating shaft. High-speed operation in which the screw seal works effectively by contacting the seal disc 11. −
By opening the seal ring to bring it into a Jl-contact state, a good sealing condition can be obtained from low speeds to high speeds.

(Example of the present invention) The embodiment shown in the figures will be described below.

In Figure 1, ■ is the frame of the rotating electric machine, 2 and 3 are the brackets, 4 is the rotating shaft, and the brackets 2 and 8 have bearings 5 and 6.
Supported through. 7 is a fixed stator core fixed to the frame 1, 8 is a rotor core fixed to the rotating shaft 4, and 9 is a coolant passage provided in the rotating shaft 4, with a supply opening at the end of the shaft on the anti-load side. It has a hole 10 and a υ1 exit hole 11 that opens on the side of the shaft on the load side. 12 is W of frame 1
A cover attached to the load side is provided with a cooling medium supply port 13 to be inserted into the supply hole 10 of the rotating shaft.

14 is a housing attached to the load side of frame 1,
A screw/rule 15 is formed on the surface facing the rotating shaft 4 by opening the outlet hole II of the bracket 8. 17 is a plurality of electromagnets provided on the outer surface of the housing 14 surrounding the rotation axis; 18 is a permanent magnet attached to the housing 14 via a diaphragm 19 so as to be movable in the axial direction; Facing,
The opposing surfaces 411 are designed to have the same polarity. 206
The seal ring 21 is fixed to the rotary shaft 4 and faces the seal ring 20 with a slight axial gap, and the seal ring 22 is a cover.

(Operation) The permanent magnet 18 is attracted to the iron 6 of the electromagnet 17, and therefore the seal ring 20 is separated from the seal disk 21.

Now, when the rotating electrical machine starts up, the electromagnet 17 is activated at the same time.
is excited, and the magnetic pole surface facing the permanent magnet 18 becomes the same polarity. Therefore, the permanent magnet 18 is repelled and the seal ring 2
0 is brought into contact with the seal disk 21. The coolant supplied from the supply port 13 to the coolant passage 9 flows through the v1 outlet 11 to the first outlet 16, but at a low speed 11. J is screw/-
The cooling medium bends through this gap and leaks to the shaft end side because the seal ring 15 is not fully used, but the seal ring 2o and the seal disk 21 are rotating in contact with each other, and the diaphragm 19
In cooperation with the above, leakage to the outside of the aircraft is prevented.

When the rotational speed increases and reaches a speed at which the screw/rule 15 is sufficiently activated, the electromagnet 17 is demagnetized by the detection output of a detector (not shown). Therefore, the permanent magnet 18 forms a gray layer on the iron core of the electromagnet 17, and the seal ring 20 is separated from the seal disk 21 and held in a non-contact state. prevent leakage to

(Other Embodiments) The seal ring 20 may be held in contact with the seal disk 21 by springs 4 and 1, and may be attracted by an electromagnet. It is also possible to provide the seal ring at a low speed so that the seal ring can be brought into contact with the seal ring by suction at low speeds. FIG. 2 shows such an embodiment, in which a magnet 1 cooling ring 23 facing the magnet 17 is supported by the housing 14 with an elastic piece 24, and the seal ring 2° is brought into contact with the seal disk 21. 011 mark 1i with electromagnet 17 during rotation
The seal ring 20 is held in a non-contact state by moving the seal ring 23 by one suction.

FIG. 3 shows yet another embodiment, which includes a plunger 26 equipped with a magnetic body 25 that is attracted and moved in the axial direction by an electromagnet 17.
The seal ring 20 is supported by the seal ring 20 and separated from the seal disk 21 by a return spring 27. 28U stonop ring, 29 is a cover.

In addition, in FIG. 4, a similar seal is provided to prevent the cooling medium from leaking from the gap between the supply port 13 and the supply hole 10 and from the discharge hole 11 to the motor bearings 5 and 6 side. The rotating shaft 4 includes a screw seal 32 provided between the cover 12 and the side surface of the rotating shaft 4, an electromagnet 33 provided on the cover 12, a permanent magnet 34 facing the magnetic pole surface of the electromagnet 33, a diaphragm 35, and a seal ring 36. Seal disc 3
7 is fixed facing the seal ring 36, and
A second housing 38 is provided between the load side bracket 3 and the housing 14, and a screw seal 39 is provided. Seal disk 48k1 for Suke 4.
This is provided for Mr. LJ. Note that the same reference numerals as in FIG. 1 indicate the same parts.

(Effects of the present invention) As described above, the present invention provides a rotating electric machine in which a cooling medium is passed through the rotating shaft, and a screw seal is provided between the fixed part and the rotating shaft. The sealing disk is fixed to the rotary shaft, and is equipped with a sealed electromagnet, a sealing ring attached to a permanent magnet or magnetic material that is moved in the axial direction by the electromagnet, and a diaphragm that closes the gap between the screw seal and the sealing ring. The seal ring is placed opposite the seal ring, and when the rotating electrical machine is at concave speed and the screw seal does not function sufficiently, the seal ring is brought into contact with the seal disk, and during high-speed rotation when the screw seal acts on the metallurgy, the ring is placed in contact with the seal disk. If the Iqn is to be maintained in a non-contact state from low speed rotation to high speed rotation, the t/C control will be effective from low speed rotation range to high rotation speed range to prevent leakage, and the contact between the seal ring and seal disk will be maintained at low speed rotation. Because of this, heat generation and wear are extremely small, making it difficult to cool the sealing part and causing damage due to its small size. r Forceps sealing device all 41) et al.
'1. It has the effect of

[Brief explanation of the drawing]

1 is a side view of the upper half showing the first embodiment of the present invention; FIG. It is a side cross-sectional view of the upper half of yet another embodiment. 1t frame, 2 and 3 brackets, 4 rotation shaft, 9
11 is a cooling medium passage, 11 is a discharge hole, 13 is a supply port, 14 is a housing, 15 is a screw/ru, 16 is a υ1 date, 17
is an electromagnet, 18 is a permanent magnet, 19 is a diaphragm, 20
is a seal ring, 21 is a seal disk, 23 is a magnetic first ring, 24 is a three-piece bullet, and a 261" i plunger. Fig. 1 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Scope of Claims] 1. A rotating electric machine in which a cooling medium is passed through a rotating shaft, wherein a screw seal is provided between the shaft end and a hole opening from the cooling medium passage of the rotating shaft to the side surface of the shaft. , a seal disk fixed to the rotating shaft on the shaft end side from the threaded seal;
A seal ring that is moved in the axial direction by an electromagnet attached to the housing and approaches and separates from the inner surface of the seal disk, and a diaphragm that closes the gap between the screw 7-ru and the seal ring are provided, and the 011 magnet is attached to a rotating electric machine. Bring the 1111 seal ring into contact with the seal disk while rotating at low speed,
A sealing device for a rotating electric machine cooling device, characterized in that the sol ring is controlled to separate from the sealing disk when the rotation reaches a high speed at which a screw seal acts. 2. Claim 1 comprising a permanent magnet facing with the same polarity as the blood of the magnet.
A sealing device for a rotating electric machine cooling device as described in 1. 3 The seal ring is I! Claim 1 comprising a magnetic body that is attracted and moved against an electromagnet and a spring.
A sealing device for a rotating electric machine cooling device as described in 1.