Non-dynamic sealing type blue energy collecting device

Abstract

The invention relates to the technical field of energy collection equipment, and provides a non-dynamic sealing type blue energy collection device which comprises a follow-up module, a power generation module and a fixing module. The follow-up module comprises a floating body, a connecting rod and a limiting hollow cylinder; the floating body comprises a floating body top section, a floating body main body section and a floating body extension section which are arranged in sequence; a containing groove with a downward opening is formed in the floating body, and the floating body is fixedly connected with a connecting rod at the top in the containing groove; the bottom of the connecting rod extends into the power generation module; the connecting rod is sleeved with a limiting hollow cylinder; the upper end of the limiting hollow cylinder extends into the containing groove, and the upper end of the limiting hollow cylinder makes contact with the inner wall of the containing groove. The bottom of the limiting hollow cylinder is fixedly connected with the power generation module; the power generation module comprises multiple layers of nested power generation units. According to the invention, the reliability of operation in a humid and corrosive marine environment can be enhanced; and the longitudinal wave energy capture ratio is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy harvesting devices, and particularly to a non-moving-sealed blue energy harvesting device. Background Art

[0002] With the growth of global energy demand and the limitations of fossil energy, the development of ocean blue energy has become an important direction. Wave energy has attracted much attention due to its wide distribution and large reserves. However, traditional electromagnetic generators have problems such as large volume, low efficiency, and high cost in low-frequency wave energy harvesting. As a new type of energy harvesting technology, triboelectric nanogenerators (TENGs) have gradually been applied to the field of ocean energy due to their advantages such as high efficiency at low frequencies, light weight, and strong environmental adaptability.

[0003] In recent years, with the in-depth study of triboelectric nanogenerators, researchers have found that triboelectric nanogenerators have unique advantages in wave energy harvesting, but there are still many problems to be solved. Wave energy itself has strong randomness and environmental dependence. Affected by the coupled action of multiple factors such as wind speed, tidal phase, and seabed topography, the energy input shows significant volatility. More critically, the marine working conditions pose extreme requirements on the reliability of the device - the dynamic water pressure changes caused by high-frequency wave impacts will exacerbate the fatigue of the sealing interface, and the high salt mist environment will induce metal electrode corrosion and dielectric material performance degradation. If there are defects in the waterproof design, it will not only lead to contact failure of the friction layer and an increase in the charge leakage rate, but may also cause an internal circuit short circuit, resulting in the complete failure of the device. Therefore, constructing a static sealing protection system with a full life cycle is a prerequisite for breaking through the technical bottleneck of wave energy TENG and achieving stable power output.

[0004] Therefore, traditional TENGs for collecting wave energy generally use dynamic seals (such as rotary shaft seals and telescopic bellows) to solve the waterproof problem, but they have fundamental defects including wear and aging, high maintenance costs, and uncontrollable water seepage risks. At the same time, the additional frictional force will consume some energy, reducing the overall power generation efficiency. In addition, existing triboelectric nanogenerators (such as planar thin films or single-layer floating ball structure types) cannot distinguish between longitudinal wave and transverse wave energy, and passively respond to the omnidirectional movement of waves, resulting in a scattered energy harvesting target and low utilization rate of longitudinal wave compression energy. Summary of the Invention

[0005] The present invention mainly solves the technical problems of the prior art such as uncontrollable water seepage risk, low power generation efficiency, and low utilization rate of longitudinal wave compression energy of wave energy harvesting devices, and proposes a non-moving-sealed blue energy harvesting device. By structural design, the need for dynamic seals is avoided, achieving a balance between full static waterproofing and high waterproofness and high energy conversion efficiency, and enhancing the reliability of TENG operation in humid and corrosive marine environments; at the same time, by selectively collecting longitudinal waves and suppressing transverse wave interference, the proportion of captured longitudinal wave energy is increased.

[0006] The present invention provides a non-moving-sealed blue energy collection device, which includes a follower module, a power generation module, and a fixed module; The follower module includes a floating body, a connecting rod, and a limiting hollow cylinder; The floating body includes a floating body top section, a floating body main section, and a floating body extension section arranged in sequence; An accommodation groove with an opening facing downwards is arranged inside the floating body, and a connecting rod is fixedly connected to the top inside the accommodation groove of the floating body; The bottom of the connecting rod extends into the power generation module; the connecting rod is sleeved with a limiting hollow cylinder; The upper end of the limiting hollow cylinder extends into the accommodation groove, and the upper end of the limiting hollow cylinder contacts the inner wall of the accommodation groove; the bottom of the limiting hollow cylinder is fixedly connected to the power generation module; The power generation module includes multiple layers of nested power generation units; The bottom of the power generation module is fixedly connected to the fixed module.

[0007] Preferably, the floating body top section adopts an umbrella-shaped flared structure, a conical structure, or a hollow cylinder structure.

[0008] Preferably, the floating body extension section adopts an umbrella-shaped flared structure.

[0009] Preferably, the length of the floating body extension section is 1.2 to 1.5 times the maximum wave height; the diameter of the floating body extension section is greater than 1.2 times the diameter of the floating body main section.

[0010] Preferably, the floating body and the connecting rod are fixedly connected by threads, by a clamp, or by welding.

[0011] Preferably, the fixed module includes a base; The power generation module is fixedly connected to the base, and the joint is sealed.

[0012] Preferably, an external wire interface is arranged on the multiple layers of nested power generation units, and the external wire interface is sealed by perfusion.

[0013] Preferably, the multiple layers of nested power generation units adopt a three-level nested structure, a four-level nested structure, or a five-level nested structure.

[0014] Preferably, the multiple layers of nested power generation units include a housing, a fixed seat, a first cylinder, a second cylinder, and a third cylinder; The housing has a hollow chamber, and an inner friction layer of the housing is arranged on the inner surface of the hollow chamber; The bottom of the housing is fixedly connected to the fixed seat; a third cylinder is arranged at the central position of the fixed seat; The first cylinder and the second cylinder are fixedly connected to the bottom of the connecting rod, and the second cylinder is arranged at the central position of the first cylinder; The first cylinder is a hollow cylinder, and the first cylinder has a first inner friction layer of the cylinder and a first outer friction layer of the cylinder; The second cylinder is a solid cylinder, and the second cylinder has a second outer friction layer of the cylinder; The third cylinder is a hollow cylinder, and the third cylinder has a third inner friction layer of the cylinder and a third outer friction layer of the cylinder; The first outer friction layer of the cylinder contacts the inner friction layer of the shell; the first inner friction layer of the cylinder contacts the third outer friction layer of the cylinder; The second outer friction layer of the cylinder contacts the third inner friction layer of the cylinder.

[0015] Preferably, the inner friction layer of the shell, the third outer friction layer of the cylinder, and the third inner friction layer of the cylinder are made of Cu film; The first inner friction layer of the cylinder, the first outer friction layer of the cylinder, and the second outer friction layer of the cylinder are made of PDMS film.

[0016] A non-moving-sealed blue energy harvesting device provided by the present invention has the following advantages compared with the prior art: 1. Full-static waterproof and long-term reliability: Through the floating body design of the dry-wet separation architecture and the umbrella-shaped flared structure, the dependence on traditional dynamic seals is completely avoided, and both high waterproof performance and high energy conversion efficiency are taken into account, suitable for reliable operation in humid and corrosive environments. The shell and the fixed seat are integrally formed, without the risk of moving parts penetrating; the length of the extended section of the floating body is 1.2 to 1.5 times the maximum wave height, and with the guidance of the umbrella-shaped flared structure, it is ensured that the fitting gap between the top port of the limited hollow cylinder and the floating body is permanently above the water surface; the waterproofness and reliability of the whole device are improved, and the service life is extended.

[0017] 2. Multi-layer nested power generation units cooperate to generate electricity and power doubling: The first cylinder, the second cylinder, and the third cylinder form a parallel power generation unit group. Through the synchronous compression-rebound movement under the action of waves, multi-level mechanical energy is captured synchronously, and the blue ocean wave energy is collected. After the output charges of each cylinder unit are superimposed in parallel, the overall power density is increased, and the increase is relatively large compared with the single-layer structure.

[0018] 3. Longitudinal wave energy directional capture and efficient conversion: The guiding mechanism composed of the limited hollow cylinder and the connecting rod accurately converts the vertical displacement of the floating body into an axial compression movement, effectively suppressing the shear interference of transverse waves (the transverse energy loss is reduced by 48%), and increasing the longitudinal wave energy conversion efficiency to 65%. The present invention realizes the directional capture and efficient conversion of longitudinal wave energy, effectively suppresses the transverse wave interference, and improves the longitudinal wave energy conversion efficiency.

[0019] 4. Compact Structure and High Space Utilization: The multi-layer nested power generation units adopt a coaxial nested layout, integrating three groups of independent power generation units within a limited housing space (with only a 15% increase in total thickness). Compared with the single-layer structure, the output power is doubled; the compact structure improves the space utilization, and the energy density per unit volume is increased compared with the traditional single-layer decentralized structure; the energy density per unit volume is increased by 3 times compared with the traditional single-layer decentralized structure, which is suitable for the narrow deployment scenarios in the offshore area. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic half-sectional structure view of the non-moving-seal blue energy harvesting device provided by the present invention; Figure 2 is a front isometric structure view of the non-moving-seal blue energy harvesting device provided by the present invention; Figure 3 is a schematic half-sectional structure view of the floating body, connecting rod, first cylinder and second cylinder; Figure 4 is a structure view of the connecting rod, first cylinder and second cylinder; Figure 5 is a structure view of the housing; Figure 6 is a structure view of the fixing seat; Figure 7 is a schematic view of the multi-layer nested power generation unit; Figure 8 is a schematic view of the installation of the non-moving-seal blue energy harvesting device provided by the present invention on the seabed.

[0021] Reference Numerals: 1, follower module; 2, power generation module; 3, fixing module; 4, floating body; 5, limiting rod; 6, housing; 7, base; 8, limiting hollow cylinder; 9, inner friction layer of the first cylinder; 10, outer friction layer of the first cylinder; 11, inner friction layer of the housing; 12, outer friction layer of the second cylinder; 13, inner friction layer of the third cylinder; 14, outer friction layer of the third cylinder; 15, connecting rod; 16, fixing seat; 401, top section of the floating body; 402, main body section of the floating body; 403, extended section of the floating body; 404, accommodation groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings rather than all the content.

[0023] As Figure 1-2As shown in the figure, a non-moving-sealed blue energy harvesting device provided by an embodiment of the present invention includes a follower module 1, a power generation module 2, and a fixed module 3.

[0024] The follower module 1 includes a floating body 4, a connecting rod 15, and a limiting hollow cylinder 8. As Figure 3 shown, the floating body 4 includes a floating body top section 401, a floating body main section 402, and a floating body extension section 403 arranged in sequence; an accommodation groove 404 with an opening facing downward is arranged inside the floating body 4, and a connecting rod 15 is fixedly connected to the top inside the accommodation groove 404 of the floating body 4; specifically, the floating body 4 and the connecting rod 15 are fixedly connected by threads, fixedly connected by a clamp, or fixedly connected by welding. The connecting rod 15, as an important component connecting the floating body 4 and the power generation module 2, is mainly used to transmit force and motion, so that the motion of the floating body 4 can be effectively transmitted to the power generation module 2, thereby realizing the collection and conversion of wave energy.

[0025] The bottom of the connecting rod 15 extends into the power generation module 2, and a first cylinder and a second cylinder are arranged at the bottom of the connecting rod 15; a limiting hollow cylinder 8 is sleeved outside the connecting rod 15; the limiting hollow cylinder 8 is fixed to the housing 6 by a flange, and a 2-mm gap is maintained between the inner wall of the limiting hollow cylinder 8 and the connecting rod 15 to limit the vertical displacement of the floating body 4.

[0026] The upper end of the limiting hollow cylinder 8 extends into the accommodation groove 404, and the upper end of the limiting hollow cylinder 8 contacts the inner wall of the accommodation groove 404; the bottom of the limiting hollow cylinder 8 is fixedly connected to the power generation module 2. The limiting hollow cylinder 8 is used to limit the movement range of other components and ensure the stability and reliability of the device under the action of waves. It is installed between the floating body 4 and the housing 6 and contacts the floating body 4, enabling the up-and-down movement of the floating body 4 to occur within a certain range and preventing the device from being damaged or losing its effectiveness due to excessive displacement. The hollow structure of the limiting hollow cylinder 8 can not only reduce the overall weight of the device but also provide space for the connection and movement of the connecting rod 15.

[0027] In the follower module 1 of the present invention, the floating body 4, as the starting point of energy capture, adopts a hollow polyethylene floating ball structure. The bottom of the floating body 4 is rigidly connected to the connecting rod 15. The floating body top section 401 adopts an umbrella-shaped flared structure, a conical structure, or a hollow cylinder structure. The floating body extension section 403 adopts an umbrella-shaped flared structure. The length of the floating body extension section 403 is 1.2 to 1.5 times the maximum wave height; the diameter of the floating body extension section 403 is greater than 1.2 times the diameter of the floating body main section 402. The floating body extension section 403 is used to block wave splashing.

[0028] The floating body 4 forms a double protection barrier through the length design of the floating body extension section 403 and the umbrella-shaped flared structure of the floating body extension section 403. The upper end of the limiting hollow cylinder 8 extends into the receiving groove 404 of the floating body 4 for a certain distance, enabling the floating body 4 to float along the limiting hollow cylinder 8 and restricting the vertical displacement of the floating body 4. The cooperation between the floating body 4 and the limiting hollow cylinder 8 keeps the top port of the limiting hollow cylinder 8 permanently above the designed water level line. The umbrella-shaped flared structure effectively deflects the wave splashing. This design completely avoids the defect of traditional dynamic seals relying on the friction of moving parts and reduces the seepage risk to the theoretical zero point. A plurality of limiting rods 5 are arranged between the limiting hollow cylinder 8 and the base 7.

[0029] The power generation module 2 includes multiple nested power generation units. The multiple nested power generation units adopt a three-stage nested structure, a four-stage nested structure, or a five-stage nested structure.

[0030] The present invention preferably adopts a three-stage nested structure, as Figures 4-7 shown, the multiple nested power generation units include a housing 6, a fixed seat 16, a first cylinder, a second cylinder, and a third cylinder.

[0031] The housing 6 has a hollow chamber, and an inner friction layer 11 of the housing is provided on the inner surface of the hollow chamber; the top of the hollow chamber is fixedly connected and sealed with the limiting hollow cylinder 8. The bottom of the housing 6 is fixedly connected with a fixed seat 16; a third cylinder is arranged at the central position of the fixed seat 16. The housing 6 and the fixed seat 16 can be made of fiberglass. The housing 6 and the fixed seat 16 are fully statically sealed by epoxy resin potting to eliminate the seawater penetration path.

[0032] The housing 6 is the external protection structure of the multiple nested power generation units, without dynamic seal interfaces, and adopts high-strength waterproof materials and static seal technology to ensure that the internal components of the device are protected from seawater and moisture erosion. The housing 6 is installed on the base 7 through the fixed seat 16, wrapping the core components such as the first cylinder and the second cylinder. The design of the housing 6 not only provides solid protection but also eliminates the leakage risk that may be brought by dynamic seals through the static seal structure, ensuring the high reliability and service life of the device.

[0033] The first cylinder and the second cylinder are movably arranged in the hollow chamber of the housing 6; the first cylinder and the second cylinder are fixedly connected to the bottom of the connecting rod 15, and the second cylinder is arranged at the central position of the first cylinder; the first cylinder and the second cylinder drive relative movement through the connecting rod 15.

[0034] The first cylinder adopts a hollow cylinder, and the first cylinder has an inner friction layer 9 of the first cylinder and an outer friction layer 10 of the first cylinder; The second cylinder adopts a solid cylinder, and the second cylinder has an outer friction layer 12 of the second cylinder; The third cylinder is a hollow cylinder, which has an inner friction layer 13 and an outer friction layer 14 of the third cylinder; The outer friction layer 10 of the first cylinder contacts with the inner friction layer 11 of the housing to form an inner and outer layer friction pair combination, serving as the first power generation unit; The inner friction layer 9 of the first cylinder contacts with the outer friction layer 14 of the third cylinder to form an inner and outer layer friction pair combination, serving as the second power generation unit; The outer friction layer 12 of the second cylinder contacts with the inner friction layer 13 of the third cylinder to form an inner and outer layer friction pair combination, serving as the third power generation unit; The first cylinder, the second cylinder and the third cylinder collect wave energy, generate friction and convert it into electrical energy. The third cylinder can also play roles such as auxiliary support, transmission, balance, etc., depending on its specific installation position and connection method in the device. It cooperates with the first cylinder and the second cylinder to jointly form a stable friction mechanical structure to ensure that the entire device can effectively collect and convert energy under the action of waves.

[0035] To improve the power generation efficiency, the materials of each part of the friction layer should be selected as a combination with a large difference in triboelectric series and good electrical and mechanical stability. The electrodes connecting the friction layers are made of high-conductivity materials to reduce the loss during the electrical energy transmission process, ensure that the power generation components can efficiently and stably convert wave energy into electrical energy output, meet different electricity consumption requirements, and improve the energy utilization efficiency of the entire device. Specifically, the inner friction layer 11 of the housing, the outer friction layer 14 of the third cylinder, and the inner friction layer 13 of the third cylinder adopt Cu films; the inner friction layer 9 of the first cylinder, the outer friction layer 10 of the first cylinder, and the outer friction layer 12 of the second cylinder adopt PDMS films. It can also be other friction pair combinations with a large difference in triboelectric series and good electrical properties.

[0036] In addition, an external wire interface is provided on the multi-layer nested power generation unit, and the external wire interface is sealed by perfusion to further improve the overall sealing performance and ensure the reliable operation of the device in a humid and corrosive environment.

[0037] The bottom of the power generation module 2 is fixedly connected to the fixed module 3. The fixed module 3 includes a base 7; the power generation module 2 is fixedly connected to the base 7, and the joint between the power generation module 2 and the base 7 is sealed. Specifically, the bottom of the fixed seat 16 of the power generation module 2 is fixedly connected to the base 7. The base 7 is the support foundation of the entire device, used to fix and stabilize the entire device. As Figure 8 shown, the base 7 is tightly connected to the seabed or the support structure by bolts to ensure the stability of the device under the action of waves. The base 7 is made of corrosion-resistant materials and is further treated against corrosion to improve its durability in the marine environment.

[0038] The core idea of the waterproof design principle of the present invention is to avoid the need for dynamic sealing through structural design and achieve fully static waterproofing, which is specifically divided into three architectures.

[0039] Firstly, there is the dry-wet separation architecture. Dry area: Above the lower end of the floating body extension section 403 to the top of the floating body top section 401 is a completely non-immersed area, and the umbrella-shaped flared structure of the floating body extension section 403 blocks wave splashing. The inner and outer layers of the power generation module 2 are frictionally sealed inside the housing 6, permanently isolating seawater contact. Wet area: The lower half of the limit hollow cylinder 8, the housing 6, the fixed seat 16, and the base 7 are in contact with seawater.

[0040] Secondly, there is the isolation of the gap risk area. Through the cooperation between the limit hollow cylinder 8 and the inner wall of the accommodation groove 404 of the floating body 4, the top port of the limit hollow cylinder 8 is located above the designed water level line, so that even if there is a gap between the limit hollow cylinder 8 and the floating body 4, there is no risk of water ingress; the length of the floating body extension section 403 is greater than the maximum wave splash height, ensuring that the gap area between the top port of the limit hollow cylinder 8 and the floating body 4 is always above the water surface.

[0041] Finally, there is the enhancement of static sealing. The fixed seat 16 and the base 7 are integrally formed by welding to eliminate the joint. The external wire interface is filled with epoxy resin for curing and sealing, and no moving parts penetrate the housing 6.

[0042] The working principle of the device of the present invention: The floating body 4 is the part directly in contact with the waves, and its main function is to drive the connecting rod 14 to generate corresponding displacements as the waves rise and fall, thereby converting wave energy into mechanical energy.

[0043] During the operation of the device, with the mechanical movement caused by the wave action, the displacement of the connecting rod 14 drives the first cylinder and the second cylinder to generate displacements, and relative sliding friction occurs between the outer friction layer 10 of the first cylinder and the inner friction layer 11 of the housing, the inner friction layer 9 of the first cylinder and the outer friction layer 14 of the third cylinder, and the outer friction layer 12 of the second cylinder and the inner friction layer 13 of the third cylinder. Due to the difference in triboelectric properties of the materials, charges are transferred on the contact surface, promoting the redistribution of charges between the two friction materials. Based on the principle of electrostatic induction, a potential difference is generated on the corresponding electrodes connected to the multi-layer nested power generation units, and then the flow of electrons is driven to form an electric current, enabling the three groups of power generation units to generate contact friction power generation, and finally generating electrical energy output in the circuit between the electrodes, completing the conversion process from wave mechanical energy to electrical energy. Specifically, when the wave lifts the floating body 4, the connecting rod 14 pulls up the first cylinder and the second cylinder, and the three groups of power generation units generate contact friction, resulting in charge transfer and electron exchange; when the wave falls back, the gravity of the floating body 4 resets to drive the reverse flow of charges. The three groups of power generation units are output through a parallel circuit, and the charge phases are strictly synchronized.

[0044] Meanwhile, to verify the technical effects, the present invention was actually measured in the Bohai Bay for 15 days. The test environment was a water depth of 15 m, an average wave height of 1.2 m, and a salinity of 28‰. During the process, no water seepage or dislocation occurred in the internal structure. The continuously monitored data showed that the daily average output power of the present invention was stable at about 50 mW, which could continuously power the marine monitoring sensor (power consumption 5 mW) for 10 hours without an additional voltage stabilizing circuit. Compared with the traditional dynamic seal generator tested during the same period, the present invention showed significant advantages in energy density and reliability.

[0045] Through the static seal design and the multi-layer collaborative power generation mechanism, the present invention overcomes the waterproof bottleneck and energy density limitation of traditional devices in the marine environment. Through the unique waterproof design, the present invention realizes a full static seal, avoiding the wear and maintenance problems of dynamic seals. The actual measurement in the Bohai Bay shows that the device remains dry inside under extreme sea conditions. Combining the multi-layer charge superposition mechanism, it meets the diverse needs from inshore to deep sea, providing an efficient and maintenance-free solution for marine energy development with the potential for large-scale application.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: modifying the technical solutions recorded in the foregoing embodiments, or equivalently replacing some or all of the technical features therein, does not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-dynamically sealed blue energy collection device, characterized in that: It comprises a follower module (1), a power generation module (2) and a fixed module (3); The follower module (1) comprises a floating body (4), a connecting rod (15) and a limiting hollow cylinder (8); The floating body (4) comprises a floating body top section (401), a floating body main section (402) and a floating body extension section (403) which are arranged in sequence; A receiving groove (404) with an opening facing downward is provided in the floating body (4), and a connecting rod (15) is fixedly connected to the top of the floating body (4) in the receiving groove (404); The bottom of the connecting rod (15) extends into the interior of the power generation module (2); the connecting rod (15) is covered with a limited hollow cylinder (8); The upper end of the limiting hollow cylinder (8) extends into the containing groove (404), and the upper end of the limiting hollow cylinder (8) contacts the inner wall of the containing groove (404); the bottom of the limiting hollow cylinder (8) is fixedly connected to the power generation module (2); The power generation module (2) comprises multiple layers of nested power generation units; The bottom of the power generation module (2) is fixedly connected to the fixing module (3).

2. The non-dynamically sealed blue energy collection device according to claim 1, characterized in that: The floating body top section (401) adopts an umbrella-shaped expansion structure, a conical structure or a hollow cylindrical structure.

3. The non-dynamically sealed blue energy collection device according to claim 1, characterized in that: The floating body extension section (403) adopts an umbrella-shaped expansion structure.

4. The non-dynamically sealed blue energy collection device according to claim 1, characterized in that: The length of the floating body extension section (403) is 1.2 to 1.5 times the maximum wave height; the diameter of the floating body extension section (403) is greater than 1.2 times the diameter of the floating body main section (402).

5. The non-dynamically sealed blue energy collection device according to claim 1, characterized in that: The floating body (4) and the connecting rod (15) are fixedly connected by threads, fixedly connected by clamps, or fixedly connected by welding.

6. The non-dynamically sealed blue energy collection device according to claim 1, characterized in that: The fixing module (3) comprises a base (7); The power generation module (2) is fixedly connected to the base (7), and the joints are sealed.

7. The non-dynamically sealed blue energy collection device according to claim 1, characterized in that: An external wire interface is provided on the multi-layer nested power generation unit, and the external wire interface is sealed by injection.

8. The non-dynamically sealed blue energy collection device according to claim 1, characterized in that: The multi-layer nested power generation unit adopts a three-level nesting structure, a four-level nesting structure or a five-level nesting structure.

9. The non-dynamically sealed blue energy collection device according to claim 8, characterized in that: The multi-layer nested power generation unit comprises a shell (6), a fixing seat (16), a first cylinder, a second cylinder and a third cylinder; The shell (6) has a hollow chamber, and the inner surface of the hollow chamber is provided with a shell inner friction layer (11); The bottom of the housing (6) is fixedly connected to a fixing seat (16); a third cylinder is arranged at the center of the fixing seat (16); The first cylinder and the second cylinder are fixedly connected to the bottom of the connecting rod (15), and the second cylinder is arranged at the center position of the first cylinder; The first cylinder is a hollow cylinder, and the first cylinder has a first cylindrical inner friction layer (9) and a first cylindrical outer friction layer (10); The second cylinder is a solid cylinder, and the second cylinder has a second cylindrical outer friction layer (12); The third cylinder is a hollow cylinder, and has a third cylinder inner friction layer (13) and a third cylinder outer friction layer (14); The first cylindrical outer friction layer (10) contacts the housing inner friction layer (11); the first cylindrical inner friction layer (9) contacts the third cylindrical outer friction layer (14); The second cylindrical outer friction layer (12) is in contact with the third cylindrical inner friction layer (13).

10. The non-dynamically sealed blue energy collection device according to claim 9, characterized in that: The inner friction layer (11) of the shell, the outer friction layer (14) of the third cylinder, and the inner friction layer (13) of the third cylinder are made of Cu film; The first cylindrical inner friction layer (9), the first cylindrical outer friction layer (10), and the second cylindrical outer friction layer (12) are made of PDMS membrane.

Images