JPS60242209A - Noise preventer serving as safety device in combination for littoral fixation type wave-power generation - Google Patents

Abstract

PURPOSE:To raise the safety of a littoral fixation type waves-power generator by a method in which an air ent valve to be opened or closed according to the turning speed of the power generator is provided in an air chamber having the generator on its upper part and being opened toward the sea surface at its downside, and an exhaust path for air passing throught the generator is provided above the body. CONSTITUTION:Air 4 in an air chamber 1 to be pushed up and pulled down by the action of waves 3 is passed through a Wells turbine 12 from an air supply duct 10 to turn the turbine 12 and also turn a generator 13 for generator of power. When the turning speeds of the generator 13 are increased, a coil 7 receives power from the generator 13 to generate the same revolving field as the induction motor in succession and also to generate eddy current in an aluminium disc 8 with revolving. An air valve 6 is opened and air stream passing through the generator is discharged through a duct 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety and noise prevention device for coastal fixed wave power generation, and is a measure against storm surges such as tsunamis, which was keenly felt through sea experiments, as well as measures to ensure safety during times of crowds, as well as safety and noise prevention devices for coastal fixed wave power generation. The purpose is to provide a wave power generation device that takes measures against noise pollution for residents.

The present inventors have been conducting a practical power generation experiment using a Wells-type wave power generation device (40KW) on the coast of Mise, Yamagata Prefecture, and through their experience, they have keenly realized the following.

(1) Coastal fixed wave power generation equipment requires measures against tsunamis and high waves, but the conventional emergency shutoff valve system that closes the outlet air passage during large waves can prevent the turbine from operating at abnormal speeds during large waves. There is a risk of destruction due to centrifugal force if the ascent cannot be stopped.

(2) Seawater may enter the air reservoir of the power generation equipment due to storm surge, so countermeasures are necessary.

(3) Wells turbines generate high-frequency noise when operating at high speeds, which causes noise pollution to residents living near the coast, so countermeasures are required.

As a countermeasure against these problems, the present invention provides a relief valve in a part of the air chamber where the power generation device is attached to the top and the bottom side is open to the sea surface.This valve opens when the rotation speed of the power generation device increases, and the air inside the pneumatic chamber is opened. A part of the air is released into the atmosphere to prevent abnormal speed increases of the turbine during large waves, and the exhaust path for the air that has passed through the power generation equipment is directed upward and opened above the main body to reduce storm surge. This is intended to prevent seawater from entering the air reservoir and, in combination with the effect of the sound-absorbing board interior, to prevent the generation of noise.

An example of implementing the present invention will be described below with reference to the drawings.

Fig. 1 is an overall side view, and Fig. 2 is an overall front view. Due to the action, air in air nitrogen 4
is pushed and pulled. An escape duct 5 is formed above the air chamber 1, and an escape valve 6 is provided near the outlet of the escape duct 5, and a disk metal fitting 8 and a rotating field coil 7 are installed to drive and open/close the escape valve 6. Being ignored. Left and right air supply ducts 10.10 hang down from the power generation device 9 attached to the upper part of the air chamber 7.
penetrates the air chamber 1 and opens onto the sea surface, and a floating lid 11.11 for closing the duct is placed in each opening.

Normally, the air 4 in the air chamber is routed to the air supply duct 1 as shown by the arrow.
From 0.10, it passes through the Wells turbine 12, 12, rotates it, rotates the coaxial generator 13, and generates electricity. The Wells turbine is characterized by maintaining the same rotational direction even if the direction of air passage is reversed, but in this case, does it generate electricity? ! ! 2 Wells turbines on 13 shafts 1
2.12 are arranged symmetrically, it is possible to offset the axial thrust generated by the aerodynamic force changing direction and smoothly operate at high speed. The Wells turbine during the experiment had a diameter of 1.33+a and was heated to 1,300 to 2.30 O by high waves.
Power generation is performed at 3 to 45 kW at a rotational speed of rpm, but when the power generation output exceeds 20 kW, turbine noise higher than 10 kW is generated, and power generation operation is stopped at night to prevent noise pollution. Therefore, in the present invention, as noise countermeasures, a sound-absorbing plate is used as the lining and the exhaust duct is opened upward.

In FIG. 3, the turbine sound generated by the Wells turbine 12, 12 is carried by the airflow, collides with the inner partition wall 14 and the outer partition wall 15, and is bent at right angles. These bulkheads 1
4. In 15, a porous sound absorbing plate 16 that absorbs relatively high sound of about 10 kc is lined. The airflow that has impinged on the inner plate 14 is directed downward in FIG. 4, and after impinging on the bottom wall 17 is directed upward and is discharged upward from the exhaust duct 18. Therefore, the noise is emitted upwards with the airflow and is not transmitted laterally.

The shape of the exhaust duct 18 described above, together with the presence of the floating lid 11 for the duct, serves as a countermeasure against high tides.

Figures 5 and 6 show conditions during high tide, where sea level 3 is the power generator 9.
Even if the water level becomes higher than this, the air inside the power generating device 9 will not escape.

Next, the escape duct 5 and the escape valve 6 will be explained. According to the conventionally known emergency on-off valve that closes the outlet of the turbine air flow when the rotation rapidly increases, the air pressure in the air chamber 1 nearly doubles when the valve is closed, causing stress in various parts. In the present invention, a relief valve is used in place of the emergency on-off valve. As a servo mechanism for this purpose, a conventionally known hydraulic pump-hydraulic rotation servo mechanism can be used, but in this embodiment, the generated power of wave power generation is used as the servo power. That is, as shown in FIG. 7, the relief valve 6 is attached to the relief duct by a bearing, and a small aluminum disc 8 with a large diameter is attached coaxially with the relief valve 6.
is provided. Three or more coils 7 (however, the number is a multiple of 3) are arranged adjacent to the disk 8, and these coils 7 receive part of the generated power from the wave power generation vA13 and generate the same rotating field as the induction motor. are generated one after another, and eddy currents are generated in the disk 8 within the rotating field, causing it to rotate to the right or left. As a result, the relief valve 6 is displaced into a closed state (solid line) and an open state (dotted line) as shown in FIG. Generally, when the valve receives air pressure, that is, its natural position is in the closed state, the valve can be held even if no current flows through the coil 7. Furthermore, when the valve is opened, the coil 7 can maintain its position due to residual magnetism even when the current is turned off, so it is considered that energy is consumed only when the valve is opened and closed. Therefore, the rotational speed of the generator 13 is detected by the coaxial tachometer 19, and the rotation speed of the generator 13 is detected by the control box 20.
The opening and closing can be controlled by changing the combination of the coils 7. Note that an automatic brake (not shown) may be provided at the shaft end of the generator 14 to prevent overspeeding in the event that power is cut off for some reason.

The present invention has made it possible to commercialize coastal fixed wave power generation devices, which will greatly improve the energy efficiency of our country, which has a long coastline.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, and Figures 1 and 2 are an overall side view and an overall front view, and Figures 3 and 4 are enlarged front views of main parts.
The same side view, FIGS. 5 and 6 are side views at high tide, the same front view, and FIGS. 7.8 are external views and side views regarding the relief valve. The symbols in the diagram indicate the respective parts. 1: Air chamber 2: Coast 3: Wave 4: Air in the air chamber 5: Escape duct 6: Escape valve 7: Rotating field coil 8: Disc hardware 9: Power generation bag M
10: Air supply duct 11: Floating lid 12: Wells turbine 13: Generator 14: Inner corner wall 15: Outer corner wall 16: Sound absorbing plate 17: Bottom wall 18: Exhaust duct 19: Tachometer 20: Control wazai l Zuga 3 spear 4 flash

Claims (1)

[Claims] 1. In a coastal fixed type wave power generation device, the power generation device is attached to the upper part of the air seedling whose bottom surface is open to the sea surface, and can be opened and closed according to the rotation speed of the power generation device. 2. Controlling the above-mentioned escape valve. Therefore, a plurality of rotating field coils are provided close to a disk or cylinder coaxially or mechanically connected to the relief valve to generate an eddy current in the disk or cylinder, and the eddy current opens and closes the relief valve. The safety and noise prevention device for coastal fixed wave power generation according to claim 1, wherein the device generates a moment that 3. Claim 1, characterized in that a floating cover is attached to the end of the air supply path constituting a part of the generator room, and the exhaust path is oriented upward and opened above the main body. Safety and noise prevention device for coastal fixed wave power generation described in . 4. Coastal fixed type % type % according to claim 1, characterized in that a sound absorbing plate that absorbs high frequency sound of 10 kcPii degree is lined at appropriate locations in the generator room.