A wave pressure type wave energy conversion device

Abstract

A wave pressure type wave energy conversion device comprises an air chamber, an exhaust duct, an air turbine, and a generator; the air chamber adopts a semi-enclosed box with an open front end and a front-to-back through-hole, and the longitudinal length of the air chamber is greater than one and a quarter wavelength; the air chamber comprises air chamber one, air chamber two, and air chamber three; the front end of the inner wall of top plate one on air chamber one is greater than half the wave height from the still water surface; the height of the inner wall of top plate two from the still water surface is less than half the wave height, and a longitudinal convex groove is arranged on the rear inner wall of top plate two; the height of the inner wall of the top plate three from the still water surface is greater than or equal to half the wave height; the present invention solves the problem of periodic reciprocating airflow in traditional pneumatic wave energy power generation technology, the air turbine rotates continuously and stably, and the energy conversion rate is significantly improved.

Description

Technical Field

[0001] The invention relates to an energy conversion device, in particular to a wave pressure type wave energy conversion device. Background Art

[0002] Ocean wave energy is a kind of mechanical energy generated by wind and stored in the form of potential energy and kinetic energy by short-period waves. Wave energy is a clean renewable energy source. The main form of wave energy utilization is wave power generation. Wave power generation devices usually include two major parts: the collection system and the conversion system. The collection system converts wave energy into mechanical motion or mechanical energy in other media, that is, primary conversion, and the main forms include pitch type, heave type, oscillating water column type, etc.; the conversion system converts the wave energy captured in the primary conversion into mechanical energy or electrical energy, that is, secondary conversion, and the main forms include air turbines, low-head turbines, generators, etc.

[0003] According to the energy transfer method, wave energy conversion devices can be divided into pneumatic, hydraulic and mechanical types. Pneumatic wave energy conversion devices absorb wave energy through air and transfer wave energy to air turbines. The advantage of pneumatic wave energy conversion devices is that the more fragile parts such as air turbines and power generation systems do not come into contact with seawater, which improves impact resistance and corrosion resistance, and is conducive to the maintenance of machinery, power generation systems and control systems.

[0004] The oscillating water column wave energy conversion device is a typical pneumatic type. It is currently the most valued and recognized device with the most promising future, the largest investment in research, and the most built and used devices in various countries. Most of the wave energy power stations built so far are also of the oscillating water column type. The oscillating water column wave energy conversion device converts wave energy into mechanical energy of air, using the ups and downs of waves to drive the air in a semi-enclosed space to flow back and forth, thereby driving the air turbine to drive the generator to generate electricity. The entire device has no underwater moving parts, and the simple air chamber can effectively convert low-speed waves into high-speed air flow, and the device has good reliability. Since air is used as the intermediate carrier for energy conversion, the air turbine generator set does not come into direct contact with seawater, avoiding problems such as seawater corrosion, marine organism attachment, and unit sealing, and improving the survivability of the device in the marine environment.

[0005] The disadvantage of traditional pneumatic wave energy conversion devices is their low efficiency, usually only 10%-30%. The main reason is that the air flow has to undergo two reversals and two points of zero speed in one wave cycle, which puts the air turbine as an energy converter in a very unfavorable variable operating state, resulting in its low conversion efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a wave pressure type wave energy conversion device with simple structure and high energy conversion rate in view of the defects and shortcomings of the prior art.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: it includes an air chamber, an exhaust duct, an air turbine, and a generator; the air chamber adopts a semi-enclosed box with an open front end and a front-to-back through-hole, and the longitudinal length of the air chamber is greater than one and a quarter wavelength; the air chamber is composed of a top plate 1, a top plate 2, a top plate 3, a rear vertical baffle and two vertical side baffles; the air chamber includes three sections of small air chambers, which are air chamber 1, air chamber 2, and air chamber 3 from the wave-facing end to the back; the top plate 1, the top plate 2 and the top plate 3 are respectively arranged on the upper parts of the air chamber 1, the air chamber 2 and the air chamber 3; the top plate 1 is arranged obliquely; the top plate 1 The height of the front end of the inner wall of the top plate from the still water surface is greater than half the wave height; the tail end of the top plate one and the front end of the top plate two are in an arc transition, and are fixedly connected as a whole; the angle between the top plate one and the top plate two is 135 degrees to 178 degrees; the height of the inner wall of the top plate two from the still water surface is less than half the wave height, and a longitudinal convex groove is arranged on the inner wall of the tail of the top plate two; the longitudinal convex groove is connected with the air chamber three; the height of the top end of the inner wall of the longitudinal convex groove from the still water surface is not less than half the wave height, and the length of the longitudinal convex groove is greater than or equal to one eighth of the wavelength; the height of the inner wall of the top plate of the top plate three from the still water surface is greater than or equal to half the wave height;

[0008] Furthermore, the exhaust pipe is arranged at the upper end of the air chamber three and is connected to the air chamber three.

[0009] After adopting the above structure, the beneficial effects of the present invention are as follows: the wave pressure type wave energy conversion device described in the present invention solves the problem of periodic reciprocating airflow in traditional pneumatic wave energy power generation technology, the air turbine rotates continuously and stably, and the energy conversion rate is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0011] Figure 1 is a side view of the present invention;

[0012] Figure 2 yes Figure 1 Sectional view in the AA direction;

[0013] Figure 3 It is a schematic diagram of the principle of the present invention for capturing wave energy and converting it into electrical energy.

[0014] Description of reference numerals:

[0015] 1. Top plate one; 2. Top plate two; 3. Top plate three; 4. Vertical side baffles; 5. Tail vertical baffles; 6. Longitudinal convex grooves; 7. Exhaust duct; 8. Air turbine; 9. Generator; 10. Still water surface; 11. First wave crest; 12. Second wave crest; 13. Wave crest outside the air chamber corresponding to the first wave crest; 14. Wave crest outside the air chamber corresponding to the second wave crest. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] See also Figure 1-2 As shown, the technical solution adopted in this specific embodiment is: it includes an air chamber, an exhaust duct 7, an air turbine 8, and a generator 9; the air chamber adopts a semi-enclosed box with an open front end and a front-to-back through-hole, and the longitudinal length of the air chamber is greater than one and a quarter wavelength; the air chamber is composed of a top plate 1, a top plate 2, a top plate 3, a tail vertical baffle 5 and two vertical side baffles 4; the air chamber includes three sections of small air chambers, which are air chamber 1, air chamber 2, and air chamber 3 from the wave-facing end to the back; the exhaust duct 7 is arranged at the upper end of the air chamber 3 and is connected to the air chamber 3; the air turbine 8 is arranged in the exhaust duct 7; the generator 9 is connected to the air turbine 8 shaft; the top plate 1, the top plate 2 and the top plate 3 are respectively arranged in the air chamber 1 and the air chamber 3. The top plate 1 is arranged at an angle; the front end of the inner wall of the top plate 1 is at a height greater than half the wave height from the still water surface 10; the tail end of the top plate 1 and the front end of the top plate 2 are in a circular arc transition, and are fixedly connected as a whole; the angle between the top plate 1 and the top plate 2 is 135 degrees to 178 degrees; the inner wall of the top plate 22 is at a height less than half the wave height from the still water surface 10, and a longitudinal convex groove 6 is arranged on the inner wall of the tail of the top plate 22; the longitudinal convex groove 6 is connected with the air chamber 3; the top end of the inner wall of the longitudinal convex groove 6 is at a height not less than half the wave height from the still water surface 10, and the length of the longitudinal convex groove 6 is greater than or equal to one eighth of the wavelength; the inner wall of the top plate of the top plate 3 3 is at a height greater than or equal to half the wave height from the still water surface 10.

[0018] See also Figure 3As shown in the figure, the principle of capturing wave energy and converting it into electrical energy is as follows: after the crest of the first wave 11 entering the air chamber from the open wave-facing end of the air chamber contacts the upturned top plate 1, the first crest 11, together with the top plate 1, the vertical side baffle 4 and the previous crest, seals the air entering the air chamber; as the height of the top plate 1 decreases and the first crest 11 moves forward, the first crest 11 continues to push and squeeze the air, and the pressure of the sealed air gradually increases, forming an air layer between the wave surface and the inner walls of the top plates 1 and 2, and the sealed compressed air can escape from the air layer. However, since the first wave crest 11 continuously applies hydrostatic pressure and impact pressure to the inner walls of the top plate 1 and the top plate 2, the compressed air escapes from the wave surface and the top plate at a low speed, and most of the compressed air is squeezed and pushed by the first wave crest 11 to be ejected from the exhaust pipe 7 of the top plate 3, driving the air turbine 8 connected to the shaft of the generator 9 to rotate, driving the generator 9 to output electrical energy; when the first wave crest 11 reaches the rear of the top plate 2, the second wave crest 12 enters the air chamber 1 and closes and squeezes the air between the first wave crest 11 and the second wave crest 12; since the first wave crest 1 In the process of squeezing and pushing the air to generate electricity, the wave energy is continuously absorbed and converted into electrical energy, and the wave height and the traveling speed are reduced. Therefore, during the period when the first wave crest 11 and the second wave crest 12 coexist in the air chamber, the traveling speed of the second wave crest 12 is faster than the first wave crest 11, and the second wave crest 12 continuously squeezes the air enclosed in the air chamber between the first wave crest 11 and the second wave crest 12; at the same time, due to the reduced traveling speed, when the first wave crest 11 reaches the rear of the top plate 2, it has obviously lagged behind the same group of wave crests outside the air chamber (that is, the first wave crest corresponding to the first wave crest outside the air chamber 13 ), the compressed air enclosed in the air chamber still maintains a relatively high pressure under the hydrostatic pressure of the wave crest outside the air chamber, and continues to do work and output electrical energy; when the first wave crest 11 reaches the tail of the top plate 2, the first wave crest 11 cannot close the longitudinal convex groove 6 on the tail end of the top plate 2, and the compressed air before and after the first wave crest 11 merges into one through the air channel in the longitudinal convex groove 6 of the top plate 2, ensuring that the compressed air is continuously and stably ejected from the exhaust pipe, thereby solving the intermittent power generation problem inherent in the reciprocating airflow generated by the periodicity of waves in traditional pneumatic wave energy power generation technology.

[0019] In order to reduce the escape of air from between the wave surface and the inner wall of top plate 1 and top plate 2, a fixed baffle or a flexible baffle curtain can be installed on the inner wall of top plate 1 and top plate 2 to block the air escape layer and reduce the loss of wave energy.

[0020] Since the top plate 2 is lower than the wave crest, a circle of closed enclosure is set on the upper part of the air chamber. The enclosure and the top plate of the air chamber are combined into a cabin, which can effectively protect the auxiliary equipment and improve the ability of the equipment to resist wind and waves.

[0021] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A wave-pressure wave energy conversion device, Features It comprises an air chamber, an exhaust duct, an air turbine and a generator; the air chamber adopts a semi-enclosed box body with an opening at the front end and through-through from front to back, and the longitudinal length of the air chamber is greater than one and a quarter wavelength; the air chamber is composed of top plate 1, top plate 2, top plate 3, a rear vertical baffle and two vertical side baffles; the air chamber comprises three sections of small air chambers, which are air chamber 1, air chamber 2 and air chamber 3 from the wave-facing end to the rear; top plate 1, top plate 2 and top plate 3 are respectively arranged on the upper parts of air chamber 1, air chamber 2 and air chamber 3; top plate 1 is arranged obliquely; the height of the front end of the inner wall of top plate 1 from the still water surface is greater than half of the wave height; there is an arc transition between the rear end of top plate 1 and the front end of top plate 2, and they are fixedly connected as a whole; the angle between top plate 1 and top plate 2 is 135 degrees to 178 degrees; the height of the inner wall of the top plate two from the still water surface is less than half the wave height, and a longitudinal convex groove is arranged on the inner wall of the tail of the top plate two; the longitudinal convex groove is connected with the air chamber three; the height of the top end of the inner wall of the longitudinal convex groove from the still water surface is not less than half the wave height, and the length of the longitudinal convex groove is greater than or equal to one eighth of the wavelength; the height of the inner wall of the top plate of the top plate three from the still water surface is greater than or equal to half the wave height; the exhaust duct is arranged at the upper end of the air chamber three and is connected with the air chamber three; the air turbine and the generator are both arranged in the exhaust duct; the generator is connected to the shaft of the air turbine; a circle of closed enclosure is arranged on the upper part of the air chamber, and the enclosure and the top plate of the air chamber are combined into a cabin structure; a fixed baffle or a flexible baffle curtain is arranged on the inner wall of the top plate two on the air chamber two.

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