JPS6189984A - Turbine casing for tandem air turbine - Google Patents

Abstract

PURPOSE:To aim at improvements in turbine efficiency, by installing a partition wall, bisecting the inside of a turbine casing, in position between two air turbines being set up symmetrically, while making each of air passages to these air turbines independent and thereby preventing the occurrence of turbulence in an airflow. CONSTITUTION:A generator 4 is placed on an air chamber 1, and two Wells turbines 61 and 6b are attached symmetrically to the shaft 5. In addition, a turbine casing 8 housing the generator 4 and these Wells turbines 6a and 6b is set up on top of the air chamber 1. The inside of this casing 8 is bisected by a partition wall 9 set up in a spot of the generator 4, forming two independent airflow passages 10a and 10b. With this constitution, air turbulence attributable to a collision of air flowing in from these airflow passages 10a and 10b at both sides is prevented from occurring, thus turbine efficiency is exceptionally improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a turbine casing for a tandem air turbine that takes measures against turbulence of airflow within the turbine casing.

[Prior art]

The present inventors are conducting a practical power generation experiment using a wave power generation device using a Wells-type air turbine on the coast of the Sea of Japan. Since the inside of the casing is one room, airflows flowing in from both the left and right sides collide between the two air turbines, resulting in turbulence in the airflow, which adversely affects turbine efficiency.

[Purpose of the invention]

Therefore, an object of the present invention is to improve turbine efficiency by preventing turbulence of airflow inside a turbine casing.

[Structure of the invention]

That is, in the turbine casing for a tandem air turbine according to the present invention, a partition wall is provided between two symmetrically arranged air turbines to divide the inside of the turbine casing into two, thereby making air flow passages for each air turbine independent. This is a characteristic feature.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a wave power generation device, in which an air chamber 1 is fixedly provided on a shore 2. The front wall 3 of this air chamber 1
The lower part of the air chamber 1 is opened to the waves W, and the air A1 inside the air chamber 1 is pushed and pulled by the action of the waves W.

As shown in FIGS. 2 and 3, a generator 4 is installed above the air chamber 1, and two Wells turbines 6a and 6b are symmetrically attached to the shaft 5 of the generator 4. This wells turbine 6
Turbine guide vanes 7.7 are provided before and after a and 6b.

The Wells turbines 6a and 6b have the characteristic that they maintain rotation in the same direction even if the direction of air passage is reversed, but in this case, the two Wells turbines 6a and 6b are symmetrically mounted on the shaft 5 of the generator 4. Since it is installed, it is possible to offset the axial thrust generated by the aerodynamic force that changes direction, allowing smooth high-speed operation.

In addition, a generator 4 and a Wells turbine 6 are installed above the air chamber 1.
Install the turbine casing 8 that houses the turbines a and 6b.

The interior of the turbine casing 8 is divided into two by a partition wall 9 installed at the generator 4, and is provided with two independent airflow passages 10a and 10b.

Thereby, the air flow passages 10a on both the left and right sides.

Air turbulence caused by collision of air flowing in from 10b is prevented.

One air flow passage 10a has an inlet/outlet 11a that communicates with the inside of the air chamber 1 and an inlet/outlet 12a that communicates with the atmosphere, and the other air flow passage 10b has an inlet/outlet 11b that communicates with the inside of the air chamber 1 and an inlet/outlet 12a that communicates with the atmosphere. It is equipped with an entrance/exit-2b that leads to the entrance/exit.

When the wave W inside the air chamber 1 rises, the air A inside the air chamber 1 passes through two independent air flow passages LOa and 10b as shown by the arrows shown by solid lines. Then each airflow passage 10a.

Wells turbine 6a due to the airflow flowing through 10b
, 6b rotate at high speed, and power generation is performed by rotating the generator 4 coaxial with these.

Next, when the wave W in the air chamber 1 descends, the air A in the atmosphere
, are air flow passages 10a and 10b as indicated by broken line arrows.
passing through the Wells turbines 5a, 5b.
Continue to rotate.

〔Effect of the invention〕

As described above, the present invention provides a partition wall that divides the inside of the turbine casing into two between two symmetrically installed air turbines, and makes the air flow passage for each air turbine independent, so that the air flow inside the turbine casing is improved. There is no turbulence in the airflow caused by collisions between the turbines themselves, which greatly improves turbine efficiency.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the wave power generation device, Figure 2 is the n of Figure 1.
FIG. 3 is a sectional view taken along line -n in FIG. 2; FIG. 5a, 5b... Wells turbine, 8... Turbine casing, 9... Partition wall, 10a, 10b... Air flow passage.

Claims (1)

[Claims] A turbine casing for a tandem air turbine, characterized in that a partition wall is provided between two symmetrically arranged air turbines to bisect the inside of the turbine casing, and air flow passages for each air turbine are made independent.