SU729706A1 - Liquid metal current collecting device - Google Patents

Description

The image relates to electrical engineering, in particular to current collection devices, intended to transfer large currents from rotating parts, mainly in unipolar machines.

Known liquid metal collector devices containing the contact protrusion of the rotary ring and a fixed contact ring enclosing it 1.

However, such current collection devices do not provide reliable operation due to spills and liquid metal flowing out of the device.

The closest to the technical essence of the invention is a liquid metal collector containing a contact protrusion of the rotary ring and its fixed contact ring in which the return chambers and leakage collecting chambers equipped with end slit seals 2 are made.

Splashes of liquid metal by the return chamber are returned to the current collection zone, and the liquid metal leaked through the mechanical seal of this chamber is collected in the leakage collection chamber, from where it enters the drainage, which ensures the retention of the liquid metal in the current collection device.

In this liquid metal current collection device, the radial height of the contact protrusion of the rotating ring is equal to the sum of the radial dimensions of the return chamber, the leak collection chamber and their end slot seals,

) 0 arranged radially in series. The relatively large height of the contact switch leads to very significant electrical losses in it. Reduced current density in

15 pin, i.e. an increase in the width of the contigus protrusion is limited by an even more significant increase in hydrodynamic losses due to an increase in the friction surface.

20

To reduce electrical and hydrodynamic losses in a liquid metal current collector in a liquid metal current collecting device that contains a contact protrusion of a rotating ring and holding it a fixed contact RING; return chambers and leakage collection chambers, each of which is provided with end slit seals, return chambers with end slit chambers are made at one radial level corresponding to the KaMepcUviH leakage collector and their end BfcJMH slit seals formed by sealing projections that are made on a rotating ring and radially entering the leak collection chambers. The drawing shows the proposed liquid metal current-collecting device, a General view. It contains a revolving contact ring 1 and a fixed contact ring 2. Hal rotates the cement ring 1 with a contact protrusion 3 of a trapezoidal section and sealing projections 4 and 5. A stationary contact ring 2 encloses the contact protrusion 3, in the radial gap between the ring 2 and the protrusion 3, the current transmitting to measure 6, which communicates with the drop-shaped chambers 7 and 8 of the return, are located on both sides relative to the contact protrusion 3. At the base of the contact protrusion 3 on both sides are made of straight, slotted seals 9 and 1 0 cameras 7 and 8 return. In the fixed contact ring on both sides of the contact protrusion there are leakage collection chambers 11 and 12, into which the sealing projections 4 and 5 radially enter. These projections form end slot seals 13, 14, 15 and 16 of the leakage collection chambers 11 and 12 . In the fixed ring 2 is made of the annular collector 17 of the supply of liquid metal, the channels 18 with the current-transmitting chamber 6; The return chambers 7 and 8 are connected by channels 19 and 20, made at a predetermined radial level relative to the current transmitting chamber 6, with collecting channels 21 leading into an annular drain collector 22. In the lower part of the fixed ring 2, leakage collection chambers 11 and 12 are connected to drainage channels 23, 24 and 25. When a liquid metal collector operates, liquid metal (eutectic sodium-potassium alloy, gallium-indium, etc.) is fed under pressure to the liquid metal supply collector 17 and enters the current-transmitting chamber 6 through channels 18. b, the contact protrusion 3, due to the frictional forces, rotates the rotation of the liquid metacell in the current-transmitting chamber 6, which provides electrical contact between the rotating 1 and the fixed 2 contact rings. The engaging liquid metal also fills the return chambers 7 and 8 to the level of entry into channels 19 and 20. Through the channels 19 and 20, the liquid metal enters channels 21 and then into the drainage manifold 22. The circulating liquid metachal drains through the current collection chamber current collection Splashes of liquid metal and its smudges on the fixed surfaces of the return chambers 7 and 8 due to the drop-shaped shape of these chambers fall on the contact protrusion 3, are rotated and centrifugal forces return to the current transmitting chamber 6. Supply of liquid metal to the current transmitting chamber b under pressure centrifugal forces on the liquid metal in the current-transmitting chamber; l returning the liquid metal to the current-transmitting chamber with return chambers 7 and 8 ensure that the current-transmitting chamber 6 is completely filled with liquid metal and thus reliable current collection. The face gap seals 9 and 10 prevent the liquid metal from escaping from the return chambers 7 and 8. A certain amount of liquid metal, leaked through the seal 9 and 10, enters the leakage collection chambers 11 and 12, collects in these chambers and is drained through the drainage channels 23, 24 and 25. The leakage of the liquid metal from the leakage collection chambers is prevented by compaction; . 13-16, which, due to the engagement of the sealing protrusions 4 and 5, return the liquid metal to the chambers 11 and 12. The arrangement of the return chambers with end slit seals at the same radial levels respectively with the leak collection chambers and their seals reduces the height of the contact protrusion up to two times over the height of the contact in the known devices. This provides a reduction in electrical losses in the contact protrusion also up to two times. Simultaneously with decreasing the height of the contact protrusion, its outer diameter decreases, which ensures a decrease in its hydrodynamic losses. When the outer diameter of the contact protrusion decreases by 10%, the hydrodynamic losses in the current collection decrease by 27%, since the type of loss is proportional to the cube of the diameter of the contact projection. The presence of sealing protrusions in the device, entering radically into the leakage collection chambers, prevents liquid metal from escaping from the current collection during the described execution of the return and collection chambers of leakages and their seals. TsXf, for example, in the well-known liquid-metal current collection, designed for a current of 100 kA and having a contact overhang of 0.65 m, using the proposed device makes it possible to reduce the diameter of the overhang to 0.605 m total losses by 21%.

Claims (1)

Claim A liquid-metal current collecting device containing a rotating ring with contact protrusions and a stationary contact ring wrapping around it, return chambers with mechanical seal and leakage collection chamber with mechanical seal, characterized in that, in order to reduce electrical and hydrodynamic losses, the return chamber and their packings are made at the same radial levels, respectively, with leakage collection chambers and their seals formed by the sealing protrusions provided with j rotating ring, wherein the protrusions are in the leakage collection chamber.