Cable-shaped ocean energy collection device and energy collection method thereof

Abstract

The present invention discloses a cable-shaped ocean energy collection device and its energy collection method. The energy collection device is a mooring cable, comprising an outer ring and an inner ring. The outer ring fits around the inner ring, wherein the outer ring is a steel wire structure, each strand of which is equidistantly twisted and conventionally right-handed. The outer layer of the inner ring is made of a waterproof material, and the inner layer is affixed with piezoelectric crystals (PVDF) in an array. Waves on the sea come from different directions, and this piezoelectric mooring cable can receive wave energy from all directions. The cable is deformed by the wave energy, causing the piezoelectric plates in the inner ring to be squeezed and bent, resulting in electrical polarization, thereby realizing energy conversion from wave energy to mechanical energy and mechanical energy to electrical energy. The device not only converts and reduces the external force on the mooring cable, but also converts this external force into electrical energy for use by offshore platforms. It is an energy supply device that can be used on a large scale, anytime, and anywhere.

Description

Technical Field

[0001] The invention relates to a cable-shaped ocean energy collection device and an energy collection method thereof. Background Art

[0002] Mooring cables, when subjected to waves and currents to maintain equipment stability, vibrate, compromising stability. Cable vibration dissipates energy to maintain stability, a wasteful energy that could be harvested and utilized. Inclement weather conditions can occur at sea, with strong winds and waves. Significant, large-angle deformation of the mooring cable can break the piezoelectric element in the inner ring, reducing energy collection efficiency. Such breaks are irreparable and require replacement, resulting in high maintenance costs. Summary of the Invention

[0003] To solve the problems existing in the above-mentioned prior art, the present invention proposes a cable-shaped ocean energy collection device and an energy collection method thereof, which is a new way to absorb ocean wave energy, that is, to improve the mooring cable that was originally only used to tighten the platform into a device that can also convert energy itself.

[0004] The present invention can be implemented through the following technical solutions:

[0005] A cable-shaped ocean energy collection device, which is a mooring cable, includes an outer ring and an inner ring, the outer ring is laminated and wrapped around the inner ring, wherein the outer ring is a steel wire structure, each strand is equidistantly twisted and conventionally right-handed, the outer layer of the inner ring is made of waterproof material, and the inner layer is laminated with a one-meter-long PVDF piezoelectric crystal every half a meter along the mooring extension direction. The 360° of the inner ring is divided into 12 parts, and the piezoelectric crystals are only laminated in 6 parts, and each piezoelectric crystal is separated by blank spaces in the other 6 parts, forming a segmented PVDF piezoelectric crystal bonding array.

[0006] Furthermore, the outer ring is a 6x36 steel wire structure.

[0007] Furthermore, the piezoelectric sheets are attached to the outer layer of the inner ring in a horizontal or vertical array.

[0008] The present invention also proposes an energy collection method implemented based on the cable-shaped ocean energy collection device, specifically: when the offshore platform swings due to waves, the mooring cable is deformed due to wave energy, and the force of the mooring cable is transmitted to the piezoelectric crystal in contact with the inner ring. When the piezoelectric crystal is subjected to an external force in a fixed direction, electric polarization occurs inside, and at the same time, charges with opposite signs are generated on the surfaces of two piezoelectric crystals, thereby converting the wave energy on the sea into mechanical energy of the mooring cable. The mechanical energy of the mooring cable is transmitted to the piezoelectric crystals in the inner ring and becomes electrical energy, thereby realizing the conversion of wave energy on the sea into electrical energy of the offshore platform; when waves or currents below the sea level pass by, the mooring cable is caused to swing by the waves or currents and will also be deformed, thereby squeezing the piezoelectric sheets in the inner ring to generate electricity.

[0009] Beneficial effects

[0010] 1) The present invention can convert and collect wave energy received by mooring cables, which was previously neglected. For some offshore power generation platforms that need to work continuously, when power is insufficient, the power collected by the mooring cables can be used to operate;

[0011] 2) Most offshore platforms or marine working equipment are equipped with mooring cables, which can be used on a large scale. In addition, when some offshore working equipment has no power to continue working in some special circumstances, it can also drop the anchor and wait for the mooring cable to use wave energy to charge itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 Schematic diagram of the outer ring structure in the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of the inner ring piezoelectric sheet in the present invention. DETAILED DESCRIPTION

[0015] The following describes the embodiments of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0016] like Figure 1 As shown, a cable-shaped ocean energy collection device of the present invention is a mooring cable, comprising an outer ring 1 and an inner ring 2, wherein the outer ring 1 is fitted around the inner ring 2, wherein the outer ring 1 is a steel wire structure, each strand of which is equidistantly twisted and conventionally right-twisted, the outer layer of the inner ring 2 is made of a waterproof material, and the inner layer is covered with piezoelectric crystals PVDF piezoelectric sheets in an array.

[0017] Among them, the outer ring 1 uses a 6x36 steel wire structure (it can also be made of other common mooring wire structures), each strand is equidistantly laid and conventionally laid to the right, the structure is as follows Figure 2 As shown. The outer layer of the inner ring 2 is made of waterproof material, and the inner layer is bonded with a one-meter-long PVDF piezoelectric crystal every half a meter along the mooring extension direction. The 360° of the inner ring is divided into 12 parts, and the piezoelectric crystals are bonded only in 6 parts, and each piezoelectric crystal is separated by blank spaces in the other 6 parts, forming a segmented PVDF piezoelectric crystal bonding array. If a complete large-area bonding is used, the piezoelectric crystal polarization will cause positive and negative charges to be generated on the same surface at the same time, resulting in a decrease in power generation. Therefore, it must be arranged in a segmented array to obtain better power generation efficiency. This is just an example of an arrangement method. It can also be horizontal, oblique, vertical, etc. As long as the segmentation is met and the arrangement method can maximize the use of the inner ring area, better energy collection power can be achieved. The horizontal array is unfolded and the flattened cross-section is as follows Figure 3 shown.

[0018] The energy harvesting method involves the following: When an offshore platform sways due to waves, the mooring cable not only secures the platform, but also deforms due to wave energy, transferring the force to piezoelectric crystals attached to the inner ring of the mooring cable. When the piezoelectric crystals are subjected to a fixed external force, electrical polarization occurs within them, generating charges of opposite sign on the surfaces of two piezoelectric crystals. This converts the wave energy into mechanical energy for the mooring cable, which is then transferred to the piezoelectric material in the inner ring as electrical energy, thus converting the wave energy into electrical energy for the offshore platform. When waves or currents pass below sea level, the mooring cable also sways due to the waves or currents, causing deformation, which compresses the piezoelectric material in the inner ring and generates electricity. Waves travel from different directions, and the piezoelectric mooring cable can receive wave energy from all directions and convert the wave energy into electrical energy through the mechanical energy generated by the mooring cable. This mooring material provides a new method for offshore energy harvesting.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cable-shaped ocean energy collection device, characterized in that: It is a mooring cable, including an outer ring and an inner ring, the outer ring is fitted and wrapped around the inner ring, wherein the outer ring is a steel wire structure, each strand is equidistantly twisted and conventionally right-twisted, the outer layer of the inner ring is made of waterproof material, and the inner layer is fitted with a one-meter-long PVDF piezoelectric crystal every half a meter along the extension direction of the mooring cable. The 360° of the inner layer is divided into 12 parts, and the piezoelectric crystals are only fitted in 6 parts, and each piezoelectric crystal is separated by blank spaces in the other 6 parts to form a segmented PVDF piezoelectric crystal fitting array; the piezoelectric crystals are fitted to the outer layer of the inner ring in a horizontal or vertical array.

2. The cable-shaped ocean energy collection device according to claim 1, characterized in that: The outer ring is a 6x36 steel wire structure.

3. The energy collection method implemented by the cable-shaped ocean energy collection device according to any one of claims 1 to 2, characterized in that: Specifically, when the offshore platform is swayed by waves, the mooring cable is deformed due to the wave energy, and the force of the mooring cable is transmitted to the piezoelectric crystals attached to the inner ring. When the piezoelectric crystals are subjected to an external force in a fixed direction, electric polarization occurs inside, and at the same time, charges with opposite signs are generated on the surfaces of two piezoelectric crystals, thereby converting the wave energy on the sea into the mechanical energy of the mooring cable. The mechanical energy of the mooring cable is transmitted to the piezoelectric crystals in the inner ring and becomes electrical energy, realizing the conversion of wave energy on the sea into electrical energy of the offshore platform; when waves or currents flow below the sea level, the mooring cable is caused to swing by the waves or currents and will also be deformed, thereby squeezing the piezoelectric crystals in the inner ring to generate electricity.

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