JPH0819220A - Cooling water supply device for rotating electric machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the precipitation of copper ions as metallic copper in filter devices and strainers. In the filter device 13 and the strainer 14, the central core of the cartridge filter and the element is made of a non-metallic material to prevent copper ions from being deposited as metallic copper due to the difference in ionization tendency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water supply device for a water-cooled rotary electric machine in which a cooling water is circulated in a hollow copper band stator winding of a turbine generator, an electric motor or the like.

[0002]

2. Description of the Related Art Generally, a cooling water supply device in a rotary electric machine is provided to prevent a temperature rise due to Joule heat generated by a large current in a large-capacity rotary electric machine.
Using a winding with a hollow for water passage in part of the stator winding,
High-purity pure water is circulated inside this winding to directly cool the copper strip.

FIG. 10 is a system diagram of a conventional cooling water supply device. In this figure, reference numeral 1 is a turbine generator that is a rotating electric machine, and 2 is a stator winding of the turbine generator, and a water passage hole is provided inside the stator winding. The cooling water, which has cooled the stator winding 2 of the rotating electric machine and has been heated, is stored in the cooling water tank 4 through the return pipe 5, and is then flown from the pump 6 to the supply pipe 3 by the pump 6. The heated cooling water is cooled in the cooler 7, and enters the stator winding 2 of the rotating electric machine via the filter 9 and the Y-type strainer 10. Since the cooling water supply pipe 3 is provided with the cooler 7, the temperature adjusting valve 8, the ion exchange device 11, and the Y-type strainer 11, the cooling water flowing back to the stator winding 2 is adjusted to an appropriate temperature. Foreign matter (usually 3-1)
Pure water having a predetermined high purity (usually an electrical conductivity of 0.3 to 0.5 μs / cm) from which particles of 0 μm ³ or more are removed is used.

On the other hand, since high-purity pure water is used as the cooling water, the parts in contact with the cooling water are usually made of copper and stainless steel. That is, the stator winding is a hollow copper band, and equipment such as pipes, valves, Y-type strainers, and filters are made of stainless steel. Further, since the filter medium of the filter 9 (hereinafter referred to as a cartridge filter) usually requires a fine filtration accuracy of 3 μm, cotton is used. Therefore, in view of the strength against the increase in differential pressure due to the progress of clogging in the filtration layer and the assembly structure, a stainless steel plate is formed into a cylindrical shape as the central core material and a large number of water passage holes are provided by punching. ing. A cotton fiber and a cotton string are alternately wound around the outer periphery of the central core to form a filter material having a predetermined outer diameter.

Further, even if the filter material of the Y-type strainer 10 flows out of the filter material of the filter device 9 or the valves and other devices in the cooling system are damaged, the stator winding 2 20-80 mesh (opening size approx. 0.9-0.2m)
m) stainless steel wire mesh is used.

[0006]

In the conventional cooling water system described above, during operation of the system, the hollow copper strip of the stator winding 2 and the copper alloy member such as the cooling pipe of the cooler 7 are put into the cooling water. Copper ions are eluted. Some of the eluted copper ions are removed by the ion exchange device 11, but some of them are circulated together with the cooling water. Then, in the water passage hole of the stainless core of the cartridge filter of the filter device 9, it is deposited as metallic copper due to the difference in the ionization tendency with the stainless steel, and adheres to the surface of the stainless core. Further, a part of the water may be peeled off and floated in the cooling water to be trapped on the outer surface of the cartridge filter to accelerate the progress of filter clogging, and also to cause early clogging of the water passage hole.

In the water passage made of stainless wire mesh of the Y strainer 10, the same copper deposition as described above also occurs. Further, along with the electrochemical phenomenon in which the above copper ions are precipitated as metallic copper, there is elution into the cooling water as iron ions of the stainless steel in the water passage portion, leading to a reduction in the life of the wire mesh and a reduction in the performance of the filter. There was a fear.

The present invention has been made based on the above circumstances, and prevents the precipitation of copper ions as metallic copper due to the difference in ionization tendency in the core portion of the cartridge filter and the element portion of the Y-type strainer, so that the cooling water circulation system is provided. (EN) Provided is a cooling water supply device for a rotating electric machine such as a turbine generator, which reduces stable copper and copper oxides and enables stable operation.

[0009]

A cooling water supply device for a rotating electric machine according to the present invention is a cooling device for cooling a hollow copper band stator winding of a rotating electric machine with pure water, and a large number of filter devices are provided in a cooling water supply path. A cylindrical cartridge filter formed by superposing a filter fiber and a string on the outer side of a central core provided with a water passage, and the material of the central core is a non-metallic material having a heat resistance of 50 ° C. or higher. It is characterized by

[0010]

In the cooling water supply system for a rotary electric machine according to the present invention having the above-mentioned structure, the filter and strainer in contact with the cooling water are
Since there is no contact with such cooling water, or it is made of plastic or ceramic, it is virtually nonexistent, and the deposition of metallic copper on the basis of the difference in ionization tendency in the filter section and strainer section is equal to 0. There is no possibility of causing various problems due to copper deposition.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 in which the same parts as in FIG.
FIG. 3 is a system diagram of an embodiment of the present invention. In this figure, a filter device 13 which will be described later is provided instead of the conventionally known filter 9 shown in FIG. 10, and a strainer 14 which is also described later is provided instead of the Y-type strainer 10.

FIG. 2 is a partially cutaway front view of the filter device 13, and FIG. 3 is an enlarged cross-sectional view of the main part thereof. The filter device 13 is constituted by accommodating a plurality of cartridge filters 16 in a cylindrical casing 15 made of metal such as stainless steel which has been subjected to pure water resistance treatment. The cartridge filter 16 is arranged at a plurality of positions in a state of being stacked in two or three stages on a partition plate 17 that divides the inside of the casing 15 into two spaces. Further, the partition plate 17 is provided with an element seat 18 for receiving the cartridge filters 16 stacked in two or three stages.
The cartridge filter 16 is provided with a center post 19 which passes through the cartridge filter 16 and is fixed to the element seat 18. Further, a spring 21 a is provided between the tip of the center post 19 and the pressing fitting 21 to apply a pressing force to the cartridge filter 16. In addition,
Reference numeral 20 denotes a spacer provided at the overlapping connection portion of the cartridge filter, and 16a denotes a central core.

In the filter device having the above-mentioned configuration, FIG.
As shown in, the cooling water flows in from the flange A above the partition plate 17 and flows out from the flange B below the partition plate 17. During that time, the cooling water passes in the direction of the thickness of the cartridge filter 16 to trap and remove foreign matter.

FIG. 4 is a perspective view showing the details of the cartridge filter 16, and FIG. 5 is a process diagram showing the outline of the manufacturing process thereof. In FIG. 4, the central core 16a at the center of the cartridge filter 16 has a heat resistant temperature of 50 ° C. or more, preferably 6 or more.
Cylinder made of plastic at 0 ℃ or more (for example, outer diameter 30m
m, length 250 mm) with a large number of water holes having a diameter of about 2 to 3 mm. On the outer periphery of the central core 16a, a cotton or acrylic filter fiber 16b and a string 16 are provided.
c is alternately wound to form a filtration layer having a predetermined outer diameter and a predetermined filtration characteristic. Here, by setting the heat resistant temperature to 50 ° C. or higher, it becomes difficult to deposit copper ions due to the difference in ionization tendency.

FIG. 6 is a sectional view of the strainer 14, and FIG. 7 is a perspective view of the element thereof. The casing 14a of the strainer 14 is made of stainless steel subjected to pure water treatment, has a flange C connected to the main pipe of the cooling system, and a straight pipe part having a flange D connected to the cooling water inlet of the rotating electric machine, and is detachable. It has a Y-shape having a branch with a lid, and a partition is provided between the branch and the straight pipe portion. The partition wall has an opening communicating with the straight pipe portion, and the element 14 is provided in this opening.
b is attached. The element 14b is formed by forming a perforated plate into a cylindrical shape as shown in FIG. 7, and is integrally formed of a non-metal material such as plastic.

The operation of the cooling water supply system of this embodiment is shown in FIG.
Is the same as the conventional one shown in FIG. However, in the present embodiment, the central core 16a of the cartridge filter 16,
Since the element 14a of the strainer 14 is made of non-metal such as plastic, the filter device 13, the strainer 1
There is no deposition of metallic copper due to the difference in ionization tendency in No. 4, and various problems due to the deposition of metallic copper found in the conventional cooling water supply device do not occur.

FIG. 8 is a perspective view of another example of the strainer 14 with a part thereof cut away, and FIG. 9 is a perspective view of the element thereof. This strainer is a bucket type, and a cylindrical strainer casing 14c made of metal such as stainless steel treated with pure water has an inlet flange E and an outlet flange F on its side wall. The element 14d includes a porous cylindrical body 14f formed by cutting a non-metallic porous plate into a cylindrical shape with the tip cut off obliquely, and a screen 14 made of plastic fiber or ceramic fiber closely adhered to the upstream side thereof.
e and. The perforated cylinder 14f prevents the fiber layer from being deformed due to the flow of cooling water.

Also in this strainer, there is no precipitation of metallic copper, and various problems due to metallic reasoning do not occur.

The present invention is not limited to the above embodiment. For example, the central core, the element and the like may not be formed of a molded body made of plastic, but may be made of metal and the surface thereof may be coated with plastic.

[0020]

As is apparent from the above, in the cooling water supply apparatus for a rotary electric machine of the present invention, the filter and strainer that come into contact with the cooling water have no contact with the cooling water, or plastic or ceramic. Since it is manufactured, there is practically nothing, and there is almost no precipitation of metallic copper due to the difference in ionization tendency in the filter section and strainer section.
A cooling water supply device that enables stable operation can be provided.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the filter device.

FIG. 3 is an enlarged cross-sectional view of the relevant part.

FIG. 4 is a perspective view showing details of a cartridge filter.

FIG. 5 is a process drawing showing the outline of the manufacturing process.

FIG. 6 is a sectional view of a strainer.

FIG. 7 is a perspective view of the element.

FIG. 8 is a cross-sectional view of another example of the strainer.

FIG. 9 is a perspective view of the element.

FIG. 10 is a system diagram of a conventional cooling water supply device.

[Explanation of symbols] 1 ......... Rotary electric machine 2 ......... Stator winding 3 ......... Supply pipe 4 ... …… Cooling water tank 5 ………… Return pipe 6 ………… Pump 7 ………… Cooler 8… ...... Temperature control valve 9 ...... Filter device 10 ...... Y type strainer 11 ...... Ion exchange device 12 ...... Bypass pipe 13 ...... Filter device 14 ...... Strainer 15 ...... Casing 16 ...... ... Cartridge filter 17 ... Partition plate 18 ... Seat 19 ... Center post 20 ... Spacer 21 ... Presser fitting

Claims (5)

[Claims] 1. A cooling device for cooling a hollow copper band stator winding of a rotating electric machine with pure water, wherein a filter fiber and a string are provided outside a central core provided with a large number of water passage holes in a filter device of a cooling water supply path. A cooling water supply device for a rotating electric machine, comprising: a cylindrical cartridge filter formed by wrapping a plurality of layers, and a material of the central core is a non-metallic material having heat resistance of 50 ° C. or higher. 2. The rotating electric machine according to claim 1, wherein the material of the central core of the cartridge filter is a molded product or metal material of reinforced plastic, coated or lined with fluororesin, ceramics or the like. Cooling water supply device. 3. A device for cooling a hollow copper band stator winding of a rotating electric machine with pure water, wherein a strainer installed in a cooling water supply path uses a metal wire mesh as a filter material of a water passage part for capturing foreign matters. A cooling water supply device for a rotating electric machine, comprising a porous plate, the outer surface of which is coated with a plastic such as a fluororesin or a ceramic so that the metal surface does not come into contact with the cooling water. 4. A cooling water device for cooling a hollow copper band stator winding of a rotating electric machine with pure water, wherein the strainer filter installed in the cooling water supply path is a screen made of reinforced plastic or ceramic fiber. A cooling water supply device for a rotating electric machine. 5. A cooling water device for cooling a hollow copper band stator winding of a rotary electric machine, wherein a strainer filter installed in a cooling water supply path has fine water passage holes made of plastic fiber or ceramic fiber. A cooling water supply device for a rotating electric machine, characterized in that a cylindrical perforated plate for reinforcement having a large number of water passage holes is concentrically provided in close contact with a screen on the downstream side to have a multiple structure.