JPH0133641B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a total flow turbine.

A total flow turbine uses hot water or a mixture of hot water and steam as a working fluid and converts the energy thereof into rotational power, and is often used for geothermal power generation.

Therefore, if the pressure of hot water or a mixture of hot water and steam is high enough, by jetting it from a Laval nozzle, a saturated steam stream containing water droplets with a diameter of 5 microns or less can be produced. If it is injected into an axial flow turbine, power can be efficiently recovered. On the other hand, when the pressure of hot water or a mixture of hot water and steam is low, it is impossible to convert it into saturated steam containing fine water droplets using a Laval nozzle or a modified nozzle thereof. Therefore, even if it is injected into an axial flow turbine, it will separate into hot water and steam in the impeller due to centrifugal force, and the hot water will collide with the impeller and act as a brake, significantly reducing efficiency and causing erosion. .

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to obtain a total flow turbine that uses low-pressure hot water or a mixture of hot water and steam as a working fluid and can efficiently recover rotational power.

The invention will be explained in detail below with reference to the drawings.

In Fig. 1A and B, the cylindrical casing 1
A rotary disk 3 is rotatably installed inside with a shaft 2 supported at the center of one end plate of the casing 1, and a rotary cylinder 5 having inner flanges 4 at both ends is provided on the outer periphery of the rotary disk 3. It is fixed at its inner circumference. Further, a large number of notches 6 are provided on the outer periphery of the rotating disk 3 at equal intervals in the circumferential direction.

Further, an impeller 7 is housed in the casing 1 and is located in the rotating cylinder 5 facing the surface of the rotating disk 3 opposite to the shaft 2, and the impeller 7 is eccentrically arranged upwardly with respect to the shaft 2. It is rotatably supported by the other end plate of the casing 1 at this position. As shown in FIG. 2, the impeller 7 is provided on its outer periphery with a large number of blades 7a each having an arcuate planar shape and slanting toward the axis 8 when viewed from the side. Furthermore, the amount of eccentricity of the shaft is selected so that the blades on the eccentric side of the outer circumference of the impeller 7 can come closest to the inner circumference of the rotating cylinder 5, as long as there is no problem with the rotation thereof.

The end plate on which the shaft 2 is supported is arranged on the same circumference, and the injection axis is located inside the rotary cylinder 5 and inclined at the same angle with respect to the end plate, so that the projection onto the end plate is on the circumference. Four Laval nozzles 9 are provided so that they are tangential to each other. Further, a steam outlet 10 is provided near the center of this end plate.

The other end plate is provided with a discharge port 11 for discharging hot water or a mixture of hot water and steam discharged from the impeller 7 to the outside of the casing 1 .

In the total flow turbine of the present invention having the above configuration, hot water or a mixture of hot water and steam injected into the casing 1 from the Laval nozzle 9 collides with the inner periphery of the rotating disk 3 and the rotating cylinder 5, as shown in FIG. , rotate them at a speed approximately equal to the circumferential vector component of the jet velocity vector.

The water droplets blown onto the rotating disk 3 move radially outward due to the centrifugal force based on the rotation, and a water layer 12 is formed on the inner periphery of the rotating cylinder 5, rotating at approximately the same speed as the rotating cylinder 5. Ru. In addition, rotating disk 3
Since many notches 6 are provided on the outer periphery of the
The water tank 12 is formed over the entire width of the inner circumference of the rotating cylinder 5. Note that the steam moves inward in the radial direction and is discharged to the outside of the casing 1 from the steam exhaust port 10.

Since the impeller 7 has the eccentricity set relative to the rotating disk 3 as described above, the blades located above are immersed in the water layer formed on the inner periphery of the rotating cylinder 5, forming a water layer. The hot water flows into the impeller 7 from here, flows toward the center of the impeller 7, and rotates the impeller 7 by changing its momentum. The rotational speed of the impeller 7 is maintained at approximately 1/2 of the rotational speed of the rotating disk 3 and therefore the rotating cylinder 5.

The hot water that has flowed into the impeller 7 becomes a two-phase flow of hot water and saturated steam while passing through the impeller, and is discharged to the outside of the casing 1 from the discharge port 11.

Since the impeller 7 of the present invention is located at the eccentric position as described above, it produces the following effects.

That is, as shown in Japanese Patent Application Laid-Open No. 55-92802,
If the radial flow turbine is placed concentrically with the rotating ring, the amount of hot water that adheres to the inside of the ring may increase depending on the operating conditions.In such cases, the entire outer circumference of the radial flow turbine is Because it comes into contact with the surface of the water film, it creates a rotational difference between it and the radial flow turbine that rotates at its rated speed, applying a brake on this turbine and significantly reducing its efficiency. However, in the present invention, the entire circumference is an impeller and only a part of the impeller comes into contact with the water layer, so there is no risk of such a reduction in energy transfer efficiency.

In addition, if the radial flow turbine is made concentric and uses the reaction of the fluid flow to obtain energy from the entire circumference and rotate the turbine, it is possible to install a differential user etc. to respond to the high and low pressure of hot water. However, in the case of acquiring energy from a part of the blade as in the present invention, the impulse energy of the fluid can be effectively used regardless of the pressure level.
Therefore, the present invention has the advantage that the device is inexpensive and simple.

As described above, according to the present invention, even if it is low pressure hot water or a mixture of hot water and steam, it is separated into hot water and steam within the casing, and the impeller is rotated by the hot water. Therefore, there is no fear that the hot water will act as a brake or cause erosion, and rotational power can be efficiently recovered.

[Brief explanation of drawings]

FIG. 1A is a front view of one embodiment of the present invention, FIG. FIG. 1... Casing, 3... Rotating disk, 4... Inner flange, 5... Rotating cylinder, 6... Notch, 7...
Impeller, 7a...Blade, 9...Laval nozzle.

Claims (1)

[Claims] 1 A cylindrical casing, a rotary disk whose shaft is rotatably supported around one end wall of the casing and has a number of notches on its periphery, and a cylindrical casing with inner flanges at both ends, and a rotary disk with an inner flange at both ends. A rotating cylinder fixed at the periphery and a shaft supported by an eccentric plate on the other end wall of the casing, having a large number of blades on the outer periphery, and rotating blades on a part of the outer periphery on the eccentric side inside the rotating cylinder. an impeller placed close to the inner circumference of the cylinder;
A total flow turbine comprising: a Laval nozzle that is provided on an end wall that supports the rotating disk and injects working fluid toward the rotating disk and the inner circumference of the rotating cylinder.