JPS6252542B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an inlet/outlet pipe in a liquid storage tank whose capacity is small compared to the flow rate of liquid, and in particular cannot be enlarged due to height restrictions.

A main cooling water tank in a hydrogen-cooled rotating electric machine will be described as an example of a liquid storage tank under the above-mentioned conditions. First, the cooling system of a hydrogen-cooled turbine generator is shown in FIG. A method is adopted in which direct cooling is performed using hydrogen gas sealed within the stator frame 1, and a method is adopted in which the stator winding 6 is cooled by using a hollow pipe as a conductor and circulating water therein. . That is, water from the water tank 7 is sent to the water cooler 9 by the circulation pump 8, and the cooling water is passed through the inside of the conductor of the stator winding 6 and then sent to the water tank 7. This cycle is repeated until the stator winding 6 It is for cooling. For this reason, hydrogen gas pressure (approximately 4 to 5 kg/cm ^{2 g) must be applied to prevent water from leaking into the stator frame 1, for example, near the connection point between the cooling water pipe and the conductor of the stator winding 6} . is maintained slightly higher (approximately 0.5 kg/cm ² g) than the water pressure of the cooling water. Therefore, hydrogen gas may conversely enter the cooling water at the connection point. Therefore, it is necessary to reliably exhaust the hydrogen gas that has entered the cooling water so that it does not accumulate in the middle of the cooling water piping. For this reason, the cooling water tank must be installed at a higher level than the stator winding position. In this position, the water tank 7 is fixed on the stator frame 1, but due to restrictions in terms of installation space and weight, the tank must have a small height and a small tank capacity. As an example to satisfy these conditions, a water tank having a shape as shown in the plan view of FIG. 2 and the side view of FIG. 3 was invented. That is, the water tank 7 is constructed by bending a steel pipe 7a into an elongated C-shape, defining an inflow section and an outflow section at the tip thereof, and forming an inlet-side closed end plate 7b and an outlet-side closed end plate 7c.
each inlet side closed end plate 7b,
An inlet pipe 7d and an outlet pipe 7e were provided passing through the outlet side closing plate 7c. The lower surface of the steel pipe 7a is fixed to the stator frame 1 with a suitable support 12, so that the height dimension is as low as possible and the weight is light. In this case, the diameter of the steel pipe 7a of the tank body (as an example, the diameter is approximately
400 mm) is considerably smaller due to the above-mentioned constraints than the tank body conventionally implemented in response to the inlet and outlet pipes (160 mm as an example) determined by the cooling water flow rate. On the other hand, if the diameter of the inlet/outlet pipe is relatively large, when the cooling water flows into or out of the water tank 7, the water surface inside the tank will be shaken and rippled, and a large amount of hydrogen gas will be mixed into the outlet pipe 7e. There is a risk of Hydrogen gas causes cavitation in the circulation pump, and fluctuations in the water level in the tank are undesirable in terms of water level detection.

SUMMARY OF THE INVENTION An object of the present invention is to configure an inlet/outlet pipe so that gas can be effectively vented when cooling water flows into and out of a water tank so as to avoid the above-mentioned disadvantages.

According to the present invention, in order to achieve the above object, the structure of the inlet and outlet pipes is as follows. That is, a tubular outlet pipe and an inlet pipe are made to protrude into the tank body at both ends of the tank body, and the openings at both ends of the tank body are closed via flanges welded to the outer peripheries of the outlet pipe and inlet pipe. Each is airtightly attached to the flange of the opening, the end face of the protrusion of the inlet/outlet pipe is closed, and a plurality of through holes are arranged at appropriate intervals at the bottom of the protrusion of the inlet/outlet pipe. At the same time, a plurality of gas vent holes were provided in the upper part to communicate with the tank body, and the upper part was positioned below the liquid level of the liquid cooling medium in the tank body.

Embodiments of the present invention will be described below based on the drawings. FIG. 4 is a longitudinal sectional view of an inlet pipe of a liquid storage tank according to an embodiment of the present invention. A flange 7f is attached to the tip of the steel pipe 7a, which is the main body of the water tank, and a closed end plate 7b is attached to the screw 1 through a gasket 10.
It is attached by 1. The protruding tip of the inlet pipe 7d passing through the closed end plate 7b is closed by a blind plate 7g. As an example, the steel pipe 7a of the main body has a diameter of 400 mm, the inlet pipe 7d has a diameter of 160 mm, and the upper part of the protruding part of the inlet pipe 7d that can protrude into the tank body has a plurality of gas vent holes 7h with a diameter of 40 mm, for example. A plurality of through holes 7i, each having a diameter of 80 mm, for example, are formed at intervals of 100 mm at the bottom of the protrusion of the tube 7d. In this structure, when cooling water mixed with hydrogen gas flows in the direction of the solid arrow, the upper part of the protrusion of the inlet pipe is filled with hydrogen gas, so the cooling water passes through the through hole 7i and flows into the steel pipe 7a. At this time, the hydrogen gas in the cooling water is separated from the water due to the difference in specific gravity, floats to the surface through the gas vent hole 7h, passes through the water surface W, and accumulates in the upper air layer. The diameter of the gas vent hole 7h in the upper part of the inlet pipe 7d is made smaller, the diameter of the through hole 7i in the upper part of the inlet pipe 7d is made larger, and the inlet pipe 7
The central axis of the inlet pipe 7d is shifted downward from the central axis of the tank body so that the upper part of the inlet pipe 7d is below the water level W in the steel pipe 7a which is the tank body, so hydrogen gas with a low specific gravity is cooled. The cooling water, which is separated from the water and escapes upward through the upper gas vent hole 7h, flows into the tank through the lower through hole 7i, which has a larger diameter than the upper gas vent hole 7h, which has a smaller diameter. This results in
This provides the effect of efficiently separating hydrogen gas from cooling water while minimizing fluctuations in the water surface within the tank. Although the inlet pipe 7d has been described above, if the outlet pipe 7e has a similar structure, the same operation and effect can be obtained.

According to the present invention, it is effective not only for the above-mentioned generator water tank but also for small-capacity tanks where the tank shape is restricted due to the flow rate and the height or cross-sectional area cannot be increased. The fluid is not limited to water.

[Brief explanation of the drawing]

Figure 1 is a diagram schematically showing the arrangement and circulation system of the storage tank for liquid cooling medium in a hydrogen-cooled rotating electric machine, Figure 2 is a plan view of the storage tank for liquid cooling medium in a hydrogen-cooled rotating electric machine, and Figure 3 2 is a side view of the liquid storage tank according to FIG. 2, and FIG. 4 is a longitudinal sectional view of the inflow section of the liquid storage tank according to an embodiment of the invention. 7: Liquid storage tank, 7b: Inlet side closed end plate, 7
c: Outlet side closed end plate, 7d: Inlet pipe, 7e:
Outlet pipe, 7h: gas vent hole, 7i: through hole.

Claims (1)

[Scope of Claims] 1. A liquid storage tank that stores a liquid cooling medium containing hydrogen gas and separates the hydrogen gas onto the liquid surface within the storage period, the tank body having an elongated shape being It is arranged above the cooling rotary electric machine, and at this time, the tubular outlet pipe and inlet pipe are made to protrude into the tank body at both ends of the tank body, and flanges welded to the outer peripheries of the outlet pipe and the inlet pipe are attached. The openings at both ends of the tank body are airtightly attached to the flanges of the openings so as to close the openings through the tank body, the end face of the protrusion of the inlet/outlet pipe is closed, and a plurality of through holes are provided at the bottom of the protrusion of the inlet/outlet pipe. At the same time, a plurality of gas vent holes are provided in the upper part of the protruding part of the inlet/outlet pipe to communicate with the tank body, and at the same time, the upper part of the protruding part is placed below the liquid level of the liquid cooling medium in the tank body. A liquid storage tank for a refrigerating medium for a hydrogen-cooled rotating electric machine, characterized in that the tank is located in a hydrogen-cooled rotating electric machine. 2. Liquid cooling for a hydrogen-cooled rotating electric machine, characterized in that, in the liquid storage tank according to claim 1, the center axes of the outlet pipe and the inlet pipe are shifted downward from the center axis of the tank body. Media storage tank.