SU484606A1 - Cryogenically cooled electric machine - Google Patents

Description

one

The invention relates to the field of electrical engineering, in particular to electric machines with cryogenic cooling.

To reduce heat flow to the cryostat of the rotor, but the shaft, the neck of the latter is cooled to a temperature of 20-SOK. For this, the shaft is covered, for example, with a fixed annular chamber filled with auxiliary refrigerant. Since the heat transfer from the shaft to the chamber is carried out only by means of radiation and thermal conductivity of residual gases in the evacuated space, surrounding it. shaft and camera, the efficiency of such a device is insufficient.

A distinctive feature of the proposed electric machine is that the coolant cooling chamber is made of two parts: a fixed one connected to the body of the electric masking machine and a rotating one fixed to the first on the shaft.

FIG. 1 and 2 are suggested; an electric machine (two variants of a cooling chamber).

The machine includes a rotor shaft 1, a housing 2, a fixed part 3 of the cooling chamber, a rotating part 4 fixed to the shaft of the chamber, a seal 5, a vacuum space 6, a coolant inlet tube 7, a coolant outlet tube 8 and a vacuum outlet 9.

In the cooling chamber (see Fig. 1), the movable part 4 may be formed by two coaxial nilindra with a common base, between which is placed a tube 7 for the introduction of the refrigerant. The joint with the fixed part of the chamber is made on its front side.

In another embodiment, the shaft fixed part of the chamber can be made in the form of parallel annular disks with a gap between them (see Fig. 2).

In the part 4 of the chamber mounted on the shaft 1, a coolant with a temperature of 20-80 K is fed through the tube 7, which cools the chamber and the shaft. The evaporating refrigerant enters the stationary part 3 of the chamber, mounted on the housing 2 of the electric machine and removed from the tube 8.

To prevent nonad) M1 of the refrigerant from the cooling chamber into the evacuated space 6, there are seals 5 located between the rotating and fixed parts of the chamber. The refrigerant seeping through the seal 5 is removed from the space 6 by pumping it through the pipe 9, which provides minimal ventilation lottery for friction of the rotor.

As a result of intensive heat exchange between the refrigerant and the chamber, the heat flux into the rotor is taken along its shaft to the base of

the level of 20-80K, which reduces heat. flow to the roost cryostat.

Subject invention

1. An electric machine with cryogenic cooling, comprising an annular shaft enclosing the shaft with a refrigerant inlet located between the rotor cryostat and a chassis shield, characterized in that the annular chamber is made of two parts relative to each other to increase the cooling efficiency.

Tey, one of which is attached to the body of the machine, and the other - on the shaft.

2. Machine non. 1, characterized in that the part of the chamber mounted on the shaft is made in the form of two coaxnally disposed cylinders with a common base, between which there is a coolant inlet pipe.

3. Machine no. 1, about tl and tea with the fact that part of the chamber, fixed on the shaft, is made in the form of parallel annular disks with a gap between them.

9 h