A non-moving-seal blue energy harvesting device

Abstract

The present invention relates to the technical field of energy harvesting devices, and provides a non-moving-sealed blue energy harvesting device, which includes a follow-up module, a power generation module, and a fixed module; the follow-up 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; a limiting hollow cylinder is sleeved outside the connecting rod; 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 present invention can enhance the reliability of operation in humid and corrosive marine environments; and improve the proportion of longitudinal wave energy capture.

Description

Technical Field

[0001] The present invention relates to the technical field of energy harvesting devices, and in particular 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 ocean energy field 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 coupling of multiple factors such as wind speed, tidal phase, and seabed topography, the energy input shows significant fluctuations. More critically, the ocean 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 deterioration of the dielectric material performance. 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 adopt 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 friction force will consume some energy and reduce 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 uncontrollable water seepage risk, low power generation efficiency, and low utilization rate of longitudinal wave compression energy in the existing wave energy harvesting devices, and proposes a non-moving-sealed blue energy harvesting device. By structural design, the need for dynamic seals is avoided, the balance between full static waterproofing and high waterproofness and high energy conversion efficiency is achieved, and the reliability of TENG operating in humid and corrosive marine environments is enhanced; at the same time, by selectively collecting longitudinal waves and suppressing transverse wave interference, the proportion of longitudinal wave energy capture 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;

[0007] The follower module includes a floating body, a connecting rod, and a limiting hollow cylinder;

[0008] The floating body includes a floating body top section, a floating body main section, and a floating body extension section arranged in sequence;

[0009] An accommodation groove with an opening facing downward is arranged inside the floating body, and a connecting rod is fixedly connected to the top inside the accommodation groove of the floating body;

[0010] The bottom of the connecting rod extends into the power generation module; the connecting rod is sleeved with a limiting hollow cylinder;

[0011] 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;

[0012] The power generation module includes multiple layers of nested power generation units;

[0013] The bottom of the power generation module is fixedly connected to the fixed module.

[0014] Preferably, the floating body top section adopts an umbrella-shaped flared structure, a conical structure, or a hollow cylinder structure.

[0015] Preferably, the floating body extension section adopts an umbrella-shaped flared structure.

[0016] 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.

[0017] Preferably, the floating body and the connecting rod are fixedly connected by threads, by a clamp, or by welding.

[0018] Preferably, the fixed module includes a base;

[0019] The power generation module is fixedly connected to the base, and the joint is sealed.

[0020] 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.

[0021] Preferably, the multiple layers of nested power generation units adopt a three-stage nested structure, a four-stage nested structure, or a five-stage nested structure.

[0022] 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;

[0023] The housing has a hollow chamber, and an inner friction layer of the housing is provided on the inner surface of the hollow chamber;

[0024] A fixed seat is fixedly connected to the bottom of the housing; a third cylinder is arranged at the central position of the fixed seat;

[0025] The first cylinder and the second cylinder are fixedly connected to the bottom of the connecting rod, and a second cylinder is arranged at the central position of the first cylinder;

[0026] The first cylinder is a hollow cylinder, and the first cylinder has a first inner friction layer and a first outer friction layer of the cylinder;

[0027] The second cylinder is a solid cylinder, and the second cylinder has a second outer friction layer of the cylinder;

[0028] The third cylinder is a hollow cylinder, and the third cylinder has a third inner friction layer and a third outer friction layer of the cylinder;

[0029] The first outer friction layer of the cylinder is in contact with the inner friction layer of the housing; the first inner friction layer of the cylinder is in contact with the third outer friction layer of the cylinder;

[0030] The second outer friction layer of the cylinder is in contact with the third inner friction layer of the cylinder.

[0031] Preferably, the inner friction layer of the housing, the third outer friction layer of the cylinder, and the third inner friction layer of the cylinder are made of a Cu film;

[0032] 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 a PDMS film.

[0033] A non-moving-sealing type blue energy collection device provided by the present invention has the following advantages compared with the prior art:

[0034] 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 traditional dynamic seal dependence is completely avoided, and both high waterproof performance and high energy conversion efficiency are taken into account, which is suitable for reliable operation in humid and corrosive environments. The housing and the fixed seat are integrally formed, without the risk of moving parts penetrating; the length of the floating body extension section is 1.2 to 1.5 times the maximum wave height, and with the umbrella-shaped flared structure for diversion, it is ensured that the fitting gap between the top port of the limiting hollow cylinder and the floating body is always higher than the water surface; the waterproofness and reliability of the whole device are improved, and the service life is extended.

[0035] 2. Co - generation and power multiplication of multi - layer nested power generation units: The first cylinder, the second cylinder and the third cylinder form a parallel - type power generation unit group. Through the synchronous compression - rebound movement under the action of waves, the multi - level mechanical energy is captured synchronously, and the blue ocean wave energy is collected. After the charges output by each cylinder unit are superimposed in parallel, the overall power density is increased, and it is increased significantly compared with the single - layer structure.

[0036] 3. Directional capture and efficient conversion of longitudinal wave energy: The guiding mechanism composed of a limited - position hollow cylinder and a 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 conversion efficiency of longitudinal wave energy 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 conversion efficiency of longitudinal wave energy.

[0037] 4. Compact structure and high space utilization rate: The multi - layer nested power generation units adopt a coaxial nested layout. Three independent power generation units are integrated in a limited shell space (the total thickness only increases by 15%). Compared with the single - layer structure, the output power is doubled; the compact structure improves the space utilization rate, 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 scenario in the offshore area. Brief Description of the Drawings

[0038] Figure 1 is a semi - sectional structure schematic diagram of the non - moving - seal blue energy collection device provided by the present invention;

[0039] Figure 2 is a front isometric structure schematic diagram of the non - moving - seal blue energy collection device provided by the present invention;

[0040] Figure 3 is a semi - sectional structure schematic diagram of the floating body, the connecting rod, the first cylinder and the second cylinder;

[0041] Figure 4 is a structure schematic diagram of the connecting rod, the first cylinder and the second cylinder;

[0042] Figure 5 is a structure schematic diagram of the shell;

[0043] Figure 6 is a structure schematic diagram of the fixed seat;

[0044] Figure 7 is a schematic diagram of the multi - layer nested power generation unit;

[0045] Figure 8 is a schematic diagram of the installation of the non - moving - seal blue energy collection device provided by the present invention on the seabed.

[0046] Reference numerals: 1, follower module; 2, power generation module; 3, fixed module; 4, floating body; 5, limiting rod; 6, housing; 7, base; 8, limiting hollow cylinder; 9, first cylindrical inner friction layer; 10, first cylindrical outer friction layer; 11, inner friction layer of the housing; 12, second cylindrical outer friction layer; 13, third cylindrical inner friction layer; 14, third cylindrical outer friction layer; 15, connecting rod; 16, fixed seat; 401, top section of the floating body; 402, main body section of the floating body; 403, extension section of the floating body; 404, receiving groove. Detailed implementation manners

[0047] 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. Additionally, 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.

[0048] As Figure 1-2 shown, a non-moving-sealed blue energy collection device provided by an embodiment of the present invention includes a follower module 1, a power generation module 2, and a fixed module 3.

[0049] 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 top section of the floating body 401, a main body section of the floating body 402, and an extension section of the floating body 403 arranged in sequence; a receiving groove 404 with an opening facing downwards is arranged inside the floating body 4, and a connecting rod 15 is fixedly connected to the top inside the receiving 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.

[0050] 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.

[0051] The upper end of the limiting hollow cylinder 8 extends into the receiving groove 404, and the upper end of the limiting hollow cylinder 8 is in contact with the inner wall of the receiving 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, ensuring 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 is in contact with 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 efficacy 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.

[0052] In the follow-up module 1 of the present invention, the floating body 4 serves as the starting point for energy capture and adopts a hollow polyethylene floating ball structure. The bottom of the floating body 4 is rigidly connected to the connecting rod 15. The top section 401 of the floating body adopts an umbrella-shaped flared structure, a conical structure, or a hollow cylinder structure. The extended section 403 of the floating body adopts an umbrella-shaped flared structure. The length of the extended section 403 of the floating body is 1.2 to 1.5 times the maximum wave height; the diameter of the extended section 403 of the floating body is more than 1.2 times the diameter of the main body section 402 of the floating body. The extended section 403 of the floating body is used to block wave splashing.

[0053] Through the length design of the extended section 403 of the floating body 4 and the adoption of an umbrella-shaped flared structure for the extended section 403 of the floating body, a double protection barrier is formed; the upper end of the limiting hollow cylinder 8 extends into the receiving groove 404 of the floating body 4 by 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 makes the top port of the limiting hollow cylinder 8 permanently located above the designed water level line. The umbrella-shaped flared structure effectively deflects wave splashing. This design completely avoids the defect of traditional dynamic seals relying on the friction of moving parts and reduces the risk of water seepage to the theoretical zero point. A plurality of limiting rods 5 are provided between the limiting hollow cylinder 8 and the base 7.

[0054] The power generation module 2 includes a multi-layer nested power generation unit. The multi-layer nested power generation unit adopts a three-stage nested structure, a four-stage nested structure, or a five-stage nested structure.

[0055] The present invention preferably adopts a three-stage nested structure, as Figures 4-7 shown, the multi-layer nested power generation unit includes a housing 6, a fixed seat 16, a first cylinder, a second cylinder, and a third cylinder.

[0056] The housing 6 has a hollow chamber, and the inner surface of the hollow chamber is provided with an inner friction layer 11 of the housing; 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.

[0057] The housing 6 is the external protection structure of the multi-layer nested power generation unit. It has no dynamic sealing interface and adopts high-strength waterproof materials and static sealing 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 sealing through the static sealing structure, ensuring the high reliability and service life of the device.

[0058] 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.

[0059] The first cylinder is a hollow cylinder, and the first cylinder has an inner friction layer 9 and an outer friction layer 10 of the first cylinder;

[0060] The second cylinder is a solid cylinder, and the second cylinder has an outer friction layer 12 of the second cylinder;

[0061] The third cylinder is a hollow cylinder, and the third cylinder has an inner friction layer 13 and an outer friction layer 14 of the third cylinder;

[0062] The outer friction layer 10 of the first cylinder contacts the inner friction layer 11 of the housing to form an inner and outer layer friction pair combination, which serves as the first power generation unit;

[0063] The inner friction layer 9 of the first cylinder contacts the outer friction layer 14 of the third cylinder to form an inner and outer layer friction pair combination, which serves as the second power generation unit;

[0064] The outer friction layer 12 of the second cylinder contacts the inner friction layer 13 of the third cylinder to form an inner and outer layer friction pair combination, which serves as the third power generation unit;

[0065] The first cylinder, the second cylinder, and the third cylinder generate friction that is converted into electrical energy by collecting wave energy. The third cylinder can also play roles such as auxiliary support, transmission, and balance, 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.

[0066] To improve the power generation efficiency, the materials of the friction layers of each part should be selected as a combination with a large difference in triboelectric series, as well as good electrical properties and mechanical stability. The electrodes connecting the friction layers are made of highly conductive materials to reduce the loss during the transmission of electrical energy, ensuring 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 friction layer 11 inside the housing, the outer friction layer 14 of the third cylinder, and the inner friction layer 13 of the third cylinder use 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 use PDMS films. It can also be other combinations of friction pairs with a large difference in triboelectric series and good electrical properties.

[0067] 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.

[0068] 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 improved in its durability in the marine environment through anti-corrosion treatment.

[0069] 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 full static waterproofing, which is specifically divided into three architectures.

[0070] First is the dry-wet separation architecture. Dry area: The area from 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 wave splash is blocked by the umbrella-shaped flared structure of the floating body extension section 403. The inner and outer layer friction pairs of the power generation module 2 are 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.

[0071] Secondly, it is the isolation of the gap risk area. Through the cooperation between the limiting hollow cylinder 8 and the inner wall of the accommodating groove 404 of the floating body 4, the top port of the limiting hollow cylinder 8 is located above the designed water level line, so that even if there is a gap between the limiting hollow cylinder 8 and the floating body 4, there is no risk of water immersion; 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 limiting hollow cylinder 8 and the floating body 4 is always above the water surface.

[0072] Finally, it is the strengthening 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 there are no moving parts penetrating the housing 6.

[0073] The working principle of the device of the present invention: The floating body 4 is the part directly in contact with the waves. 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.

[0074] 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, between the inner friction layer 9 of the first cylinder and the outer friction layer 14 of the third cylinder, and between the outer friction layer 12 of the second cylinder and the inner friction layer 13 of the third cylinder. Due to the difference in the triboelectric properties of the materials, charges are transferred on the contact surface, prompting 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 reset of the floating body 4 drives 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.

[0075] At the same time, to verify the technical effect, the present invention has been actually measured in the Bohai Bay for 15 days. The test environment is 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 has occurred in the internal structure. The continuously monitored data shows that the daily average output power of the present invention is stable at about 50 mW, which can continuously supply power to the marine monitoring sensor (power consumption 5 mW) for 10 hours without the need for an additional voltage stabilizing circuit. Compared with the traditional dynamic sealing generator tested during the same period, the present invention shows significant advantages in both energy density and reliability.

[0076] Through the static seal design and 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 a unique waterproof design, the present invention achieves full static sealing, avoiding the wear and maintenance problems of dynamic sealing; measurements in the Bohai Bay show that the device remains dry inside even under extreme sea conditions. Combined with the multi-layer charge superposition mechanism, it meets the diverse needs from inshore to deep sea, providing an efficient and maintenance-free solution for ocean energy development with the potential for large-scale application.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended 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 they can modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features, without departing from the scope of the technical solutions of the present invention.

Claims

1. A non-moving-seal type blue energy collection device, characterized in that, It includes a follow-up module (1), a power generation module (2), and a fixing module (3); The follow-up module (1) includes a floating body (4), a connecting rod (15), and a limiting hollow cylinder (8); 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; 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 more than 1.2 times the diameter of the floating body main section (402); An accommodation groove (404) with an opening facing downwards 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); The bottom of the connecting rod (15) extends into the power generation module (2); a limiting hollow cylinder (8) is sleeved outside the connecting rod (15); 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 power generation module (2) includes a multi-layer nested power generation unit; the multi-layer nested power generation unit adopts a three-level nested structure, a four-level nested structure, or a five-level nested structure; The multi-layer nested power generation unit includes a housing (6), a fixing seat (16), a first cylinder, a second cylinder, and a third cylinder; The housing (6) has a hollow chamber, and an inner friction layer (11) of the housing is arranged on the inner surface of the hollow chamber; The bottom of the housing (6) is fixedly connected to a fixing seat (16); a third cylinder is arranged at the central position of the fixing seat (16); The first cylinder and the second cylinder are fixedly connected to the bottom of the connecting rod (15), and a second cylinder is arranged at the central position of the first cylinder; The first cylinder adopts a hollow cylinder, and the first cylinder has a first cylinder inner friction layer (9) and a first cylinder outer friction layer (10); The second cylinder adopts a solid cylinder, and the second cylinder has a second cylinder outer friction layer (12); The third cylinder adopts a hollow cylinder, and the third cylinder has a third cylinder inner friction layer (13) and a third cylinder outer friction layer (14); The first cylinder outer friction layer (10) contacts the inner friction layer (11) of the housing; the first cylinder inner friction layer (9) contacts the third cylinder outer friction layer (14); The second cylinder outer friction layer (12) contacts the third cylinder inner friction layer (13); The bottom of the power generation module (2) is fixedly connected to the fixing module (3).

2. The non-moving-seal type blue energy collection device according to claim 1, wherein The floating body (4) and the connecting rod (15) are fixedly connected by threads, by a clamp, or by welding.

3. The non-moving-seal type blue energy collection device according to claim 1, characterized in that The fixing module (3) includes a base (7); The power generation module (2) is fixedly connected to the base (7), and the joint is sealed.

4. The non-moving-seal type blue energy collection device according to claim 1, characterized in that, An external wire interface is arranged on the multi-layer nested power generation unit, and the external wire interface is sealed by perfusion.

5. The non-moving-seal type blue energy collection device according to claim 1, characterized in that, The friction layer (11) inside the housing, the third cylindrical outer friction layer (14), and the third cylindrical inner friction layer (13) 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 film.

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