CN118167538A

CN118167538A - Wave power generation device and installation method thereof

Info

Publication number: CN118167538A
Application number: CN202410353056.9A
Authority: CN
Inventors: 任盼红; 赵昊; 谢梅香; 李建国; 贾立忠; 张宏伟; 王志刚; 张蕊; 高建标; 张文远; 任炜辰
Original assignee: China Institute of Water Resources and Hydropower Research
Current assignee: China Institute of Water Resources and Hydropower Research
Priority date: 2024-03-26
Filing date: 2024-03-26
Publication date: 2024-06-11

Abstract

The application relates to a wave power generation device and an installation method thereof. The wave power generation device is arranged on the offshore wind power foundation; the wave power generation device comprises a floating assembly, a piston assembly, a supporting assembly and a hydroelectric power generation assembly; the floating assembly floats on the sea surface and forms a closed space with the sea surface, and can be sleeved outside the offshore wind power foundation in an up-and-down sliding manner; the piston assembly comprises a piston rod and a piston which are connected, the piston rod is supported on the floating assembly through a supporting assembly, the piston is arranged in the lower inner cavity in a vertically sliding manner so as to divide the lower inner cavity into a first cavity and a second cavity in sequence from top to bottom, wherein when the piston slides upwards, the first cavity is separated from the second cavity, and when the piston slides downwards, the first cavity is communicated with the second cavity; the hydroelectric power generation assembly is arranged on the offshore wind power foundation, a liquid inlet of the hydroelectric power generation assembly is communicated with the first cavity through a water inlet pipe, and a liquid outlet of the hydroelectric power generation assembly is communicated with the second cavity through a water outlet pipe.

Description

Wave power generation device and installation method thereof

Technical Field

The application relates to the technical field of new energy power generation, in particular to a wave power generation device and an installation method thereof.

Background

Offshore wind power is an extremely important clean energy source and is an important strategic support for national energy transformation. The offshore wind power generator consists of a unit, a tower and a foundation, and the offshore wind power foundation is one of key links of design, construction and operation and maintenance of an offshore wind power plant. In the running process of the wind turbine, the foundation bears the coupling of wind turbine load, wave load, water flow load, sea ice load, earthquake action and the like to form a circulating load, and especially the wind turbine load is more outstanding, so that when the service life of the offshore wind turbine foundation reaches the designed service life (for example, 25 years), the offshore wind turbine foundation needs to be dismantled, however, the dismantling difficulty of the offshore wind turbine foundation is high, and the cost of an offshore wind power plant is also increased.

Disclosure of Invention

In view of the above, it is desirable to provide a wave power device and a method of installing the same.

The wave power generation device is arranged on an offshore wind power foundation, and a partition plate is arranged in the offshore wind power foundation so as to divide an inner cavity of the offshore wind power foundation into an upper inner cavity and a lower inner cavity which are separated from each other from top to bottom in sequence;

the wave power unit includes: the hydraulic power generation device comprises a floating assembly, a piston assembly, a supporting assembly and a hydraulic power generation assembly;

The floating assembly floats on the sea surface and forms a closed space with the sea surface, and the floating assembly is sleeved outside the offshore wind power foundation in a vertically sliding manner;

The piston assembly comprises a piston rod and a piston which are connected, the piston rod is supported on the floating assembly through the supporting assembly, the piston is arranged in the lower inner cavity in a vertical sliding mode, so that the lower inner cavity is sequentially divided into a first cavity and a second cavity from top to bottom, the first cavity is separated from the second cavity when the piston slides upwards, and the first cavity is communicated with the second cavity when the piston slides downwards;

the hydraulic power generation assembly is arranged on the offshore wind power foundation, a liquid inlet of the hydraulic power generation assembly is communicated with the first cavity through a water inlet pipe, and a liquid outlet of the hydraulic power generation assembly is communicated with the second cavity through a water outlet pipe.

In one embodiment, the floating assembly includes a sliding sleeve and a floating body;

the sliding sleeve is sleeved outside the offshore wind power foundation in a vertically sliding manner;

The floating main body comprises an end cover and an annular body, the end cover is arranged around the sliding sleeve in a surrounding mode and arranged at an upper end port of the annular body, and the supporting component is arranged on the end cover.

In one embodiment, the floating assembly further comprises a reinforcement member coupled to the outer circumferential surface of the sliding sleeve, so the upper surface of the end cap, and the support assembly is coupled to the reinforcement member.

In one embodiment, the reinforcement comprises a plurality of reinforcement ribs arranged at intervals along the circumferential direction of the sliding sleeve;

The reinforcing rib plate is in a right triangle shape, wherein a right-angle side of the reinforcing rib plate is connected with the sliding sleeve, the other right-angle side of the reinforcing rib plate is connected with the end cover, and the inclined plane of the reinforcing rib plate is connected with the supporting component.

In one embodiment, the reinforcing rib plate has a hollowed-out area.

In one embodiment, the supporting component comprises a plurality of supporting rods, the upper ends of the supporting rods are positioned in the upper inner cavity and are intersected, and the lower ends of the supporting rods are arranged at intervals along the circumferential direction of the offshore wind power foundation and are connected with the floating component;

the upper end of the piston rod is connected with the intersection parts of the plurality of support rods.

In one embodiment, the piston is a downwardly projecting arcuate washer.

In one embodiment, the lower end of the water inlet pipe passes through the upper inner cavity to be communicated with the partition plate.

In one embodiment, the lower end of the drain tube extends into the second chamber in a sealed sequence through the partition and the piston.

A method of installing a wave power unit, the method comprising:

Dismantling a fan head and a tower of the offshore wind power generation device from a retired offshore wind power foundation, wherein a partition plate is arranged in the offshore wind power foundation so as to divide an inner cavity of the offshore wind power foundation into an upper inner cavity and a lower inner cavity which are separated from each other sequentially from top to bottom;

sleeving the floating assembly outside the offshore wind power foundation in a vertically sliding manner, and placing the floating assembly on the sea surface so as to form a closed space between the floating assembly and the sea surface;

Supporting a piston rod of a piston assembly on the floating assembly through a supporting assembly, and slidably arranging a piston of the piston assembly in the lower inner cavity to divide the lower inner cavity into a first cavity and a second cavity sequentially from top to bottom, wherein when the piston slides upwards, the first cavity is separated from the second cavity, and when the piston slides downwards, the first cavity is communicated with the second cavity;

According to the wave power generation device and the installation method thereof, the floating assembly can be driven to slide up and down by utilizing the marine waves so as to drive the piston to slide up and down, and therefore the power generation of the hydroelectric power generation assembly can be realized. The wave power generation device can be directly arranged on the retired offshore wind power foundation, the retired offshore wind power foundation can be rapidly utilized, the problem of dismantling the retired offshore wind power foundation is solved to a certain extent, and the engineering cost is reduced.

Drawings

Fig. 1 and fig. 2 are schematic structural diagrams of a wave power device according to an embodiment of the application. It should be noted that, in order to clearly describe the structure of the wave power unit, the wave power unit shown in fig. 1 does not show the water inlet pipe and the water outlet pipe, and the wave power unit shown in fig. 2 does not show the floating assembly and the supporting assembly.

Fig. 3 is a top view of the wave power unit provided in fig. 1 or 2.

Fig. 4 is a side view of a piston of the wave power unit provided in fig. 1 or 2.

Wherein reference numerals in the drawings are as follows:

100. a wave power generation device; 110. a floating assembly; 111. sliding the sleeve; 112. a floating body; 1121. an end cap; 1122. an annular body; 113. a reinforcement; 1131. reinforcing rib plates; 1131a, holes; 120. a piston assembly; 121. a piston rod; 122. a piston; 130. a support assembly; 131. a support rod; 140. a hydro-power generation assembly; 141. a water inlet pipe; 142. a drain pipe; 200. an offshore wind power foundation; 210. a partition plate; m, a closed space; p, upper cavity; q, lower cavity; q1, a first chamber; q2, a second chamber; s, sea surface.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Ocean waves store huge energy, and the energy of the waves can be utilized for power generation, wherein the worldwide economic value of wave energy exploitation is estimated to be 1-10 hundred million kW, and the theoretical reserve of wave energy in China can be about 7000 ten thousand kW. Therefore, the wave power generation device can be installed on the retired offshore wind power foundation (namely, the offshore wind power foundation with the service life reaching the design life), so that wave power generation is realized, the retired offshore wind power foundation does not need to be dismantled, and the cost of an offshore wind power plant can be reduced.

As shown in fig. 1 and 2, an embodiment of the present application provides a wave power device 100. As shown in fig. 1 and 2, the wave power generation device 100 may be installed on an offshore wind power foundation 200, and a partition 210 is disposed in the offshore wind power foundation 200 to divide an inner cavity of the offshore wind power foundation 200 into an upper inner cavity P and a lower inner cavity Q, which are separated from each other sequentially from top to bottom. The offshore wind power foundation 200 may be a foundation with a bottom buried below the seabed, such as a single pile foundation or a jacket foundation. It should be noted that, the upper cavity P of the offshore wind power foundation 200 is not communicated with the lower cavity Q, and the medium (e.g., seawater) in the lower cavity Q does not flow into the upper cavity P.

With continued reference to fig. 1, the wave power device 100 may include: a float assembly 110, a piston assembly 120, a support assembly 130, and a hydro-power generation assembly 140. The floating assembly 110 floats on the sea surface S and forms a closed space M with the sea surface S, and the floating assembly 110 is sleeved outside the offshore wind power foundation 200 in a vertically sliding manner; the piston assembly 120 includes a piston rod 121 and a piston 122 connected, the piston rod 121 is supported on the floating assembly 110 by a supporting assembly 130, the piston 122 is slidably disposed in the lower cavity Q up and down to divide the lower cavity Q into a first chamber Q1 and a second chamber Q2 sequentially from top to bottom, wherein the first chamber Q1 is separated from the second chamber Q2 when the piston 122 slides up, and the first chamber Q1 is communicated with the second chamber Q2 when the piston 122 slides down; the hydroelectric power generation assembly 140 is arranged on the offshore wind power foundation 200, a liquid inlet of the hydroelectric power generation assembly 140 is communicated with the first chamber Q1 through a water inlet pipe 141, and a liquid outlet of the hydroelectric power generation assembly 140 is communicated with the second chamber Q2 through a water outlet pipe 142.

The following describes the operation of the wave power unit 100:

When the sea surface S rises from the first position to the second position due to the generation of waves on the sea surface S, the volume of the enclosed space M enclosed by the floating assembly 110 and the sea surface S is reduced and the pressure is increased, so that the floating assembly 110 is pushed to slide upwards along the outer wall of the offshore wind power foundation 200. During the upward sliding process of the floating assembly 110, the piston 122 also slides upward along the inner wall of the offshore wind power foundation 200, and the medium in the first chamber Q1 is extruded into the water inlet pipe 141 due to the separation between the first chamber Q1 and the second chamber Q2, and the upper cavity P, and flows into the hydroelectric assembly 140 to generate electricity, and then returns to the second chamber Q2 through the water outlet pipe 142. When the sea surface S falls back from the second position, the volume of the enclosed space M enclosed by the floating assembly 110 and the sea surface S becomes larger and the pressure is reduced, the floating assembly 110 slides downward together with the piston 122, and at this time, the first chamber Q1 is communicated with the second chamber Q2, so that the medium in the second chamber Q2 flows to the first chamber Q1 to supplement the medium to the first chamber Q1, so that enough medium can flow into the hydroelectric assembly 140, and normal power generation of the hydroelectric assembly 140 can be ensured.

When the offshore wind power foundation 200 is in normal service, the height of the tower installed on the offshore wind power foundation 200 is about 100m, and the length of the fan blade is about 120m, which results in excessive horizontal load applied to the offshore wind power foundation 200 by the fan blade normally, while other loads are much smaller than the horizontal load, and have little influence on the service life of the offshore wind power foundation 200. Considering that the offshore wind power foundation 200 is 15m above the sea surface S, and the wave power generation device 100 of the embodiment only depends on the floating assembly 110 to slide up and down on the offshore wind power foundation 200, the horizontal load applied to the offshore wind power foundation 200 is small, so that the structural strength of the offshore wind power foundation 200 can meet the safety requirement even after the offshore wind power foundation 200 is retired.

It can be seen that, in the wave power generation device 100 of this embodiment, the floating assembly 110 can be driven to slide up and down by using the ocean waves to drive the piston 122 to slide up and down, so as to realize the power generation of the hydroelectric power generation assembly 140. The wave power generation device 100 can be directly arranged on the retired offshore wind power foundation 200, so that the retired offshore wind power foundation 200 can be rapidly utilized, the problem of dismantling the retired offshore wind power foundation 200 is solved to a certain extent, and the construction cost is reduced.

In some embodiments of the present application, as shown in FIG. 1, a floating assembly 110 may include a sliding sleeve 111 and a floating body 112; the sliding sleeve 111 is sleeved outside the offshore wind power foundation 200 in a vertically sliding manner; the floating body 112 includes an end cover 1121 and an annular body 1122, the end cover 1121 is disposed around the sliding sleeve 111 and disposed at an upper end port of the annular body 1122, and the support assembly 130 is disposed on the end cover 1121. The floating assembly 110 of this structure is simple in structure and is also easily formed into a closed space M with the sea surface S.

It should be noted that, the lower end edge of the sliding sleeve 111 and the outer peripheral surface of the offshore wind power foundation 200 are gapless, so as to ensure that a closed space M is formed between the floating assembly 110 and the sea surface S; and the upper end edge of the sliding sleeve 111 has a small gap with the outer circumferential surface of the offshore wind power foundation 200 to ensure that the sliding sleeve 111 can slide up and down along the offshore wind power foundation 200.

Further, as shown in fig. 1, the floating assembly 110 may further include a reinforcing member 113, the reinforcing member 113 being coupled to the outer circumferential surface of the sliding sleeve 111, the upper surface of the end cap 1121; the support assembly 130 is connected to the stiffener 113. The stiffener 113 may increase the strength of the floating assembly 110.

As shown in fig. 1 and 2, the reinforcement member 113 includes a plurality of reinforcement rib plates 1131 spaced apart along the circumference of the sliding sleeve 111; the reinforcing rib plate 1131 is in a right triangle shape, wherein a right-angle side of the reinforcing rib plate 1131 is connected with the sliding sleeve 111, the other right-angle side of the reinforcing rib plate 1131 is connected with the end cover 1121, and the inclined surface of the reinforcing rib plate 1131 is connected with the supporting component 130. The reinforcement 113 is at least composed of a plurality of reinforcing rib plates 1131, so that the weight of the reinforcement 113 can be reduced, and the floating assembly 110 can be ensured to float on the sea surface S; in addition, each reinforcing rib 1131 is arranged in a triangular shape, so that connection with the support assembly 130, the sliding sleeve 111 and the end cover 1121 is facilitated, and the reinforcing rib 1131 is more stable in structure.

The reinforcing rib plates 1131 can be uniformly distributed along the circumferential direction of the sliding sleeve 111, so that the reinforcing rib plates 1131 are uniformly stressed. Regarding the number of reinforcing rib plates 1131, it may be set according to circumstances as long as the securing rib plates are reliably connected with the support assembly 130, the sliding sleeve 111, and the end cap 1121, and for example, 2, 3, 4, 5, 6, or more may be set.

Reinforcing rib 1131 may be welded, screwed, etc. to support assembly 130, sliding sleeve 111, and end cap 1121.

The reinforcing rib 1131 may also have a hollowed-out area as shown in fig. 1. The hollowed-out area may further reduce the weight of the stiffener 113, and may ensure that the floating assembly 110 floats on the sea surface S. Wherein, the reinforcing rib plate 1131 can be provided with holes 1131a in the hollow area. Regarding the shape of the hole 1131a, it may be polygonal, circular, quarter-circular as shown in fig. 1, or irregular, and embodiments of the present application are not particularly limited.

In some embodiments of the present application, as shown in fig. 1, the support assembly 130 may include a plurality of support rods 131, upper ends of the plurality of support rods 131 being located in the upper cavity P and intersecting each other, lower ends of the plurality of support rods 131 being spaced apart along the circumference of the offshore wind power foundation 200 and connected with the floating body 110; the upper end of the piston rod 121 is connected to the junction of the plurality of support rods 131. The support assembly 130 is so configured as to be easily coupled to the piston rod 121, thereby facilitating the piston 122 to be able to slide up and down along the inner wall of the offshore wind power foundation 200.

It should be noted that, the upper inner cavity P of the offshore wind power foundation 200 is a non-closed space, and a through hole may be formed on a cavity wall of the upper inner cavity P of the offshore wind power foundation 200, so that the upper end of the support rod 131 may extend into the upper inner cavity P of the offshore wind power foundation 200 through the through hole. The through holes are bar-shaped holes to ensure that the supporting rods 131 slide up and down under the driving of the floating assembly 110. The number and positions of the through holes may be set according to the progress of the support bar 131.

The upper ends of the plurality of support rods 131 may be joined together by welding, integrally forming, or the like, and the joined portion of the plurality of support rods 131 may be connected to the upper end of the piston rod 121 by welding, screws, or the like, and the lower end of the support rod 131 may be connected to the corresponding reinforcing rib plate 1131 by welding, screws, or the like.

In some embodiments of the present application, as shown in FIG. 4, the piston 122 is a downwardly projecting arcuate pad. When the piston 122 slides upwards, the medium in the first chamber Q1 presses down the outer edge of the piston 122, so that the outer edge of the piston 122 and the inner wall of the offshore wind power foundation 200 are closely attached together, and the medium in the first chamber Q1 is prevented from flowing to the second chamber Q2; when the piston 122 slides downward, the pressure of the second chamber Q2 below the piston 122 increases, and the medium in the second chamber Q2 is pushed into the first chamber Q1 against the piston 122 from the outer edge of the piston 122. The piston 122 of this structure is simple in structure and can realize the effect of unidirectional conduction. Wherein the piston 122 may be a rubber gasket.

In some embodiments of the present application, as shown in fig. 2, the lower end of the water inlet pipe 141 communicates with the partition 210 through the upper cavity P. The water inlet pipe 141 is arranged in the offshore wind power foundation 200, so that a certain protection effect can be achieved on the water inlet pipe 141, the structure of the water inlet pipe 141 can be simplified, and the water inlet pipe 141 can be a straight pipe. Wherein the hydro-power generation assembly 140 may be disposed on top of the offshore wind power foundation 200.

Similarly, as shown in fig. 2, the lower end of the drain pipe 142 extends into the second chamber Q2 through the partition 210 and the piston 122 in turn. The drain pipe 142 is built in the offshore wind power foundation 200, which can protect the drain pipe 142 to a certain extent, and can simplify the structure of the drain pipe 142, and the drain pipe 142 can be a straight pipe.

A sealing ring may be disposed between the drain pipe 141 and the partition 210, and the sealing ring may play a role in sealing, so as to prevent the medium in the first chamber Q1 from flowing into the upper chamber P. The sealing ring can be a rubber ring, and the rubber ring can be arranged on the water inlet pipe 141 or the partition 210 in a bonding mode.

The piston 122 may be interference fit with the drain pipe 142 to ensure the tightness of the first chamber Q1 when the piston 122 is up. Wherein, the piston 122 is provided with a through hole for the water supply and drainage pipe 142 to pass through, and the aperture of the through hole is smaller than the pipe diameter of the drainage pipe 142.

In another aspect, another embodiment of the present application also provides a method for installing the wave power device 100, the method comprising:

Step S100, a fan head and a tower of the offshore wind power generation device are removed from the retired offshore wind power foundation 200, wherein a partition plate 210 is arranged in the offshore wind power foundation 200 so as to divide an inner cavity of the offshore wind power foundation 200 into an upper inner cavity P and a lower inner cavity Q which are separated from each other from top to bottom in sequence;

step S200, sleeving the floating assembly 110 outside the offshore wind power foundation 200 in a vertically sliding manner, and placing the floating assembly 110 on the sea surface S so as to form a closed space M between the floating assembly 110 and the sea surface S;

Step S300, supporting the piston rod 121 of the piston assembly 120 on the floating assembly 110 through the supporting assembly 130, and slidably disposing the piston 122 of the piston assembly 120 in the lower cavity Q to divide the lower cavity Q into a first chamber Q1 and a second chamber Q2 sequentially from top to bottom, wherein the first chamber Q1 is separated from the second chamber Q2 when the piston 122 slides upwards, and the first chamber Q1 communicates with the second chamber Q2 when the piston 122 slides downwards;

In step S400, the hydroelectric power assembly 140 is disposed on the offshore wind power foundation 200, and the liquid inlet of the hydroelectric power assembly 140 is communicated with the first chamber Q1 through the water inlet pipe 141, and the liquid outlet of the hydroelectric power assembly 140 is communicated with the second chamber Q2 through the water outlet pipe 142.

By the installation method for installing the wave power generation device 100, the wave power generation device 100 can be directly installed on the retired offshore wind power foundation 200, the retired offshore wind power foundation 200 can be rapidly utilized, the problem of dismantling the retired offshore wind power foundation 200 is solved to a certain extent, and the engineering cost is reduced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. The wave power generation device is characterized by being arranged on an offshore wind power foundation, wherein a partition plate is arranged in the offshore wind power foundation so as to divide an inner cavity of the offshore wind power foundation into an upper inner cavity and a lower inner cavity which are separated from each other from top to bottom in sequence;

2. The wave power unit according to claim 1, wherein the floating assembly comprises a sliding sleeve and a floating body;

3. The wave power unit according to claim 2, characterized in that the floating assembly further comprises a reinforcement member connected to the outer circumferential surface of the sliding sleeve, so that the upper surface of the end cover, and the support assembly is connected to the reinforcement member.

4. A wave power unit according to claim 3, wherein the reinforcement comprises a plurality of reinforcement ribs arranged at intervals along the circumference of the sliding sleeve;

5. The wave power unit according to claim 4, wherein the reinforcing rib plate has a hollowed-out area.

6. The wave power unit according to any one of claims 1 to 5, wherein the support assembly comprises a plurality of support rods, the upper ends of the plurality of support rods being located in the upper cavity and intersecting each other, the lower ends of the plurality of support rods being spaced apart along the circumference of the offshore wind foundation and connected to the floating assembly;

7. The wave power unit according to any of claims 1-5, wherein the piston is a downwardly protruding arc-shaped washer.

8. The wave power unit according to any of claims 1-5, wherein the lower end of the water inlet pipe is in communication with the partition through the upper cavity.

9. A wave power unit according to any one of claims 1-5, characterized in that the lower end of the drain pipe extends into the second chamber in a sealed manner through the partition and the piston in sequence.

10. A method of installing a wave power unit, the method comprising: