A universal joint type connection device for offshore wind turbine platforms and subsea connections

Abstract

The present invention belongs to the field of offshore power generation technology and specifically discloses a universal joint connection device for connecting an offshore wind turbine platform to the seabed. By installing a cross universal joint connection structure at the bottom of the tension-type floating wind power platform body and using the cross universal joint connection structure as the swing center, when encountering strong winds or waves, the platform can swing in response to the wind and waves and float under the action of buoyancy. At the same time, by connecting the floating platform to the seabed, the force acting on the platform body can be transmitted to the seabed through the universal joint, avoiding the phenomenon of twisting when using mooring cables, improving the stability of the connection between the platform body and the seabed, providing effective support for the wind power generation equipment, and allowing the wind turbine to maintain stable operation against the wind.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore power generation, in particular to a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed. BACKGROUND

[0002] With the increasing demand for energy and the increasing depletion of land resources, people's attention has gradually shifted from land to sea, and the energy reserves of resources in the sea are huge, especially in the deep sea area. Developing offshore energy is of great significance to energy structure adjustment and sustainable development.

[0003] A wind power generation device is a renewable energy facility for wind power generation, which converts wind energy into electrical energy. Unlike traditional wind power generation, an offshore wind turbine is a wind power generation system in which a wind turbine is built on a floating platform on the water surface, and is suitable for wind energy development in deep water areas. A conventional offshore wind turbine generally includes at least one vertical buoy and at least one extension arm connected to the periphery of the bottom of the buoy to form a floating platform, which is composed of a steel structure or a reinforced concrete structure. The upper part is connected to the wind turbine tower and the cabin, and the lower part is connected to the anchoring structure on the seabed by a mooring cable system to adapt to changes in waves, tidal currents and wind in the marine environment.

[0004] However, in special sea conditions, for example, when the mooring cable is continuously impacted by waves, the dynamic force received is easy to cause the mooring cable to twist, that is, the mooring cable is easy to bend, which reduces the stability of the platform and the anchoring structure after connection, and further seriously weakens the functionality of the connection structure, so that it cannot provide effective support for the wind power generation device above the platform, thereby affecting the operation safety and power generation efficiency of the entire offshore wind power generation system. SUMMARY

[0005] Therefore, the present application provides a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed to solve the problem that the mooring cable cannot provide effective support for the wind power generation device in the prior art.

[0006] Specifically, the present application provides a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed, comprising a cross universal joint type connecting structure, the cross universal joint type connecting structure is installed at the bottom of the platform main body of the column type floating wind turbine, and the cross universal joint type connecting structure serves as a swing center for the platform main body to swing around the cross universal joint type connecting structure and be installed on the seabed.

[0007] Beneficial effects: By installing the cross universal joint type connecting structure at the bottom of the platform main body of the column type floating wind turbine, and taking the cross universal joint type connecting structure as the swing center, when encountering strong wind or sea waves, the platform main body can swing to adapt to the action of the wind and waves, and realize floating under the action of the buoyancy, so that the force acting on the platform main body can be transmitted to the seabed, avoiding the phenomenon of torsion when using mooring cables, improving the connection stability of the platform main body and the seabed, providing effective support for the wind power generation equipment, so that the wind turbine can maintain stable wind operation. At the same time, the platform main body can automatically adjust the posture according to the change of wind direction and sea waves, better adapt to the change of marine environment, that is, in relatively severe sea conditions, wind energy can be effectively captured, which helps to improve the phenomenon that the power generation efficiency is affected by external environmental factors, and improve the reliability of power generation. In addition, by reducing the direct impact of wind and sea waves on the generator set, the anti-deformation ability of the floating platform can also be improved.

[0008] In an alternative embodiment, the cross universal joint type connecting structure comprises a seabed base and a universal joint assembly, the seabed base is fixed on the seabed; the universal joint assembly comprises a first shaft body fixing piece, a first shaft body, a second shaft body fixing piece and a second shaft body, the first shaft body fixing piece is installed at the top of the seabed base, the first shaft body is installed on the first shaft body fixing piece, the second shaft body fixing piece is installed at the bottom of the platform main body, the second shaft body is installed on the second shaft body fixing piece, and the second shaft body fixing piece rotates around the central axis of the second shaft body; wherein the projections of the first shaft body and the second shaft body in the horizontal reference plane are cross arranged.

[0009] Beneficial effects: By adding the first shaft body and the second shaft body, and making the projections of the first shaft body and the second shaft body in the horizontal reference plane cross arranged, the first shaft body fixing piece installed at the top of the seabed base and the second shaft body fixing piece installed at the bottom of the platform main body can rotate relative to each other, realizing the rotation of the platform main body around the first shaft body axis and / or the second shaft body axis, avoiding the circumferential torsion of the platform main body around the platform main body axis, so that the force acting on the platform main body is transmitted to the ground, that is, the torque acting on the platform main body is directly transmitted to the ground. Such arrangement helps the platform main body to make adaptive adjustment according to the change of wind direction and sea waves, improves the wind resistance and wave resistance of the platform main body, so that it can also maintain a relatively stable running state in complex marine environment, thereby making the power generation process more reliable.

[0010] In an alternative embodiment, the cross-type joint connecting structure further comprises first shaft body bearing spaces and second shaft body bearing spaces, the first shaft body bearing spaces are arranged in pairs and symmetrically distributed at the two ends of the first shaft body along the axial direction of the first shaft body; the second shaft body bearing spaces are arranged in pairs and symmetrically distributed at the two ends of the second shaft body along the axial direction of the second shaft body; wherein any end of the first shaft body along the axial direction of the first shaft body is inserted into the first shaft body bearing space, and any end of the second shaft body along the axial direction of the second shaft body is inserted into the second shaft body bearing space.

[0011] Beneficial effects: By inserting the two ends of the first shaft body along the axial direction of the first shaft body and the two ends of the second shaft body along the axial direction of the second shaft body into the corresponding shaft body bearing spaces, the support structure of each shaft body can be enhanced to withstand the forces and torques from the platform body and the seabed more stably. At the same time, the symmetrical arrangement of various shaft body bearing spaces makes the corresponding shaft body bear forces more evenly during rotation, improving the phenomenon of stress concentration and fatigue damage caused by uneven forces.

[0012] In an alternative embodiment, a bearing base is installed in any shaft body bearing space, and the bearing base is used to install the bearing of the shaft body.

[0013] Beneficial effects: By installing a bearing base in each shaft body bearing space and installing a corresponding bearing at the bearing base, the carrying capacity of the bearing can be enhanced, and at the same time, reliable support for the shaft body can be achieved to ensure that the bearing provides high rotation accuracy and stability for the shaft body.

[0014] In an alternative embodiment, any shaft body bearing space is a watertight cabin.

[0015] Beneficial effects: By setting each shaft body bearing space as a watertight cabin, the amount of water entering the interior of the bearing space is reduced, preventing water from contacting the metal structure inside the bearing space, reducing the risk of corrosion, avoiding damage to the bearing and mechanical failure caused by water erosion, prolonging the service life of the universal joint, and improving economic efficiency.

[0016] In an alternative embodiment, a plurality of sealing elements are provided at the water outlet of the bearing of any shaft body bearing space, the plurality of sealing elements are arranged in intervals along the shaft axis direction to form a plurality of gaps, and the plurality of gaps are used to arrange detection ends of pressure detection elements, the detection ends of the pressure detection elements are used to detect the pressure value at the location and convert it into a pressure signal, and the electrical connection end of the pressure detection element is electrically connected with a control terminal to transmit the pressure signal to the control terminal.

[0017] Beneficial effects: Since each shaft body bearing is set in the form of a water-tight cabin, it needs to be sealed, for example, by providing a plurality of seals at the bearing water outlet of each shaft body bearing, which are arranged along the axis direction of the shaft body, forming multiple lines of defense, effectively preventing water and other impurities from entering the interior of the bearing, and improving the sealing performance. Since the two adjacent seals are arranged in the direction of the axis of the shaft body, multiple gaps are formed, and the detection end of the pressure detection member is provided at each gap, so that the pressure detection members can detect the hydraulic pressure at the gap. By feeding back the measured hydraulic load data to the control terminal, the hydraulic pressure difference of multiple adjacent gaps can be formed, and then compared with the preset hydraulic pressure difference threshold value to determine whether the water tightness of each bearing is normal, so that the maintenance personnel can make more accurate decisions. That is, by monitoring and warning the bearing gap pressure in real time, the water tightness of the bearing can be confirmed in real time, and it can be determined whether the bearing is abnormal during use, a stable sealing environment and pressure monitoring mechanism are constructed, which helps to improve the operation stability of the universal joint and reduce downtime caused by faults.

[0018] In an optional embodiment, any bearing base is provided with a stress detection member detection end for detecting the radial stress value of the bearing. The electrical connection end of the stress detection member is electrically connected to the control terminal. The stress detection member is used to convert the radial stress value into a radial stress signal and transmit the radial stress signal to the control terminal.

[0019] Beneficial effects: By adding radial stress detection members, the radial load received by the bearing during operation can be monitored in real time, providing real-time data support for maintenance personnel to timely detect abnormal conditions such as excessive stress and stress fluctuations during bearing operation, thereby warning potential faults in advance and allowing maintenance personnel to make more accurate decisions in a timely manner to prevent safety accidents caused by bearing damage.

[0020] In an optional embodiment, a fluid channel extending along the axis direction is formed in any shaft body. The fluid channel is in communication with the oil outlet of the oil storage member through the oil conveying pipe.

[0021] Beneficial effects: By providing a fluid channel extending along the axis direction in each shaft body and using an oil conveying pipe to connect the fluid channel with the oil outlet of the oil storage member located at the platform main body, the lubricating oil stored in the oil storage member can be continuously and stably conveyed to the interior of the shaft body through the fluid channel, reducing downtime caused by insufficient lubrication, and evenly distributed on the surface of the shaft body, improving the lubrication effect and reducing friction and wear during operation of each shaft body. At the same time, by using this design, the addition of lubricating oil is more simple and convenient, reducing the cost and time of maintaining the shaft body.

[0022] In an alternative embodiment, the cross universal joint type connecting structure further comprises a mounting block for integrated mounting of the first shaft body bearing space and the second shaft body bearing space.

[0023] In an alternative embodiment, the mounting block is provided with an oil injection hole in communication with the fluid passage of the first shaft body and the fluid passage of the second shaft body. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings needed in the specific embodiment description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] Figure 1 The front view schematic diagram of the universal joint type connecting device provided for the embodiment of the present application when installed at the bottom of the offshore wind turbine platform;

[0026] Figure 2 The front view schematic diagram of the universal joint type connecting device for connecting the offshore wind turbine platform and the seabed provided for the embodiment of the present application;

[0027] Figure 3 The side view schematic diagram of the universal joint type connecting device for connecting the offshore wind turbine platform and the seabed provided for the embodiment of the present application;

[0028] Figure 4 The front view schematic diagram of any shaft body bearing space in the universal joint type connecting device for connecting the offshore wind turbine platform and the seabed provided for the embodiment of the present application;

[0029] Figure 5 The perspective view schematic diagram of the universal joint assembly in the universal joint type connecting device for connecting the offshore wind turbine platform and the seabed provided for the embodiment of the present application;

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1, platform main body; 11, floating body; 12, connecting body;

[0032] 2, cross universal joint type connecting structure; 21, seabed base; 22, universal joint assembly; 221, first shaft body fixing member; 222, first shaft body; 223, second shaft body fixing member; 224, second shaft body; 225, first shaft body bearing space; 226, second shaft body bearing space; 227, bearing base; 228, bearing; 229, sealing member; 231, mounting block; 232, oil injection hole;

[0033] 31, pressure detection member;

[0034] 41, fluid passage; 42, oil storage member; 43, oil delivery pipe member;

[0035] 5, pile foundation;

[0036] 6, oil-water separation device;

[0037] K, seabed baseline; P, seabed baseline; Q, landfill prevention uplift section. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0042] Unlike traditional wind power generation, the floating wind turbine generator set refers to a kind of wind power generation system in which wind turbine is established on the floating platform on the water surface, which is suitable for wind energy development in deep water area.

[0043] The conventional floating wind turbine system generally comprises a floating platform composed of at least one vertical buoy and at least one extension arm connected to the bottom periphery of the buoy, the platform is composed of a steel structure or a reinforced concrete structure, the upper part is connected with a wind turbine tower and a nacelle, and the lower part is connected with an anchoring structure on the seabed by a mooring cable system to adapt to the changes of waves, tidal currents and wind in the marine environment.

[0044] However, when encountering special sea conditions, for example, when the mooring cable is continuously impacted by waves, the dynamic force received is easy to cause the mooring cable to bend or even twist, which reduces the stability of the platform after being connected with the anchoring structure, seriously weakens the functionality of the connecting structure, and cannot provide effective support for the wind power equipment above the platform, thereby affecting the operation safety and power generation efficiency of the entire offshore wind power system.

[0045] Therefore, the platform main body is extended into the sea below and extends towards the seabed, and a cross universal joint type connecting structure is additionally arranged at the bottom of the platform main body, so that the platform main body of the floating wind turbine system can swing around the cross universal joint type connecting structure, so that the force received by the platform main body when encountering strong wind or waves and other special sea conditions can be transmitted to the seabed through the cross universal joint type connecting structure, avoiding the phenomenon of twisting when the mooring cable is used, thereby improving the connection stability of the platform main body and the seabed and providing effective support for the wind power equipment.

[0046] Reference Figures 1 to 5 , Figure 1 Fig. 1 shows a front view of a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed according to an embodiment of the present application; Figure 2 Fig. 2 shows a front view of a cross universal joint type connecting structure in a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed according to an embodiment of the present application after installation; Figure 3 Fig. 3 shows a side view of a cross universal joint type connecting structure in a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed according to an embodiment of the present application after installation; Figure 4 Fig. 4 shows a front view of the space between any shaft body bearing in a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed according to an embodiment of the present application; Figure 5 Fig. 5 shows a perspective view of a universal joint assembly in a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed according to an embodiment of the present application. In the figure, K is a seabed baseline, P is a seabed baseline, and Q is an anti-burying lifting section.

[0047] The embodiments of the present application will be described below in conjunction with the drawings. Figures 1 to 5

[0048] According to an embodiment of the present application, a universal joint type connecting device for connecting an offshore wind turbine platform with the seabed is provided. As shown in Figure 1 ​As shown, the universal joint type connecting device for connecting the offshore wind turbine platform with the seabed comprises a cross universal joint type connecting structure 2, which is installed at the bottom of the platform body 1 of the column type floating wind turbine and serves as the swing center, and the cross universal joint type connecting structure 2 is swingably installed on the seabed.

[0049] In this way, by installing the cross universal joint type connecting structure 2 at the bottom of the platform body 1 and taking the cross universal joint type connecting structure 2 as the swing center, when strong wind or sea waves are encountered, the platform body 1 swings around the cross universal joint type connecting structure 2, so that the force acting on the platform body 1 can be transmitted to the seabed, avoiding the torsion phenomenon that occurs when the mooring cable is used, thereby improving the connection stability of the platform body 1 and the seabed, providing effective support for the wind power generation equipment, and enabling the wind turbine to maintain stable wind operation.

[0050] Meanwhile, the platform body 1 can automatically adjust the posture according to the changes of the wind box and the sea waves, better adapt to the changes of the marine environment, that is, in relatively harsh human conditions, the wind energy can be effectively captured, which helps to improve the phenomenon that the power generation efficiency is affected by external environmental factors and improve the reliability of power generation.

[0051] In addition, by improving the impact of wind and sea waves on the generator set, the overturning resistance of the floating platform is improved.

[0052] In one embodiment, as shown in Figure 2 and Figure 3 the cross universal joint type connecting structure 2 comprises a seabed base 21 and a universal joint assembly 22, the seabed base 21 is fixed on the seabed; the universal joint assembly 22 comprises a first shaft body fixing member 221, a first shaft body 222, a second shaft body fixing member 223 and a second shaft body 224, the first shaft body fixing member 221 is installed at the top of the seabed base 21, the first shaft body 222 is installed on the first shaft body fixing member 221, the second shaft body fixing member 223 is installed at the bottom of the platform body 1, the second shaft body 224 is installed on the second shaft body fixing member 223, and the second shaft body fixing member 223 rotates around the central axis of the second shaft body 224; wherein the projections of the first shaft body 222 and the second shaft body 224 in the horizontal reference plane are cross arranged.

[0053] That is, by additionally arranging the first shaft body 222 and the second shaft body 224 and cross arranging the projections of the first shaft body 222 and the second shaft body 224 in the horizontal reference plane, the first shaft body fixing member 221 installed at the top of the seabed base 21 and the second shaft body fixing member 223 installed at the bottom of the platform body 1 can rotate relative to each other, the platform body 1 can rotate around the first shaft body axis and / or the second shaft body axis, the circumferential torsion of the platform body 1 around the platform body 1 axis is avoided, and the torque acting on the platform body 1 is directly transmitted to the ground.

[0054] In this way, the platform body 1 can be adapted to the changes of the wind box and the sea waves, and the wind resistance and wave resistance of the floating platform are improved, so that the floating platform can maintain a relatively stable operation state in a complex marine environment, and the power generation process is more reliable.

[0055] Preferably, the projections of the first shaft body 222 and the second shaft body 224 in the horizontal reference plane are vertically arranged.

[0056] It can be explained that, in the embodiment, as shown in Figure 2 and Figure 3 , the seabed base 21 is fixed to the seabed by the pile foundation 5, and P is the seabed baseline, and Q is the anti-filling lifting section, that is, the height difference between the first shaft body fixing member 221 after being lifted by the seabed base 21 and the seabed baseline, which is to prevent the silt filling caused by the movement of the seabed to the universal joint assembly 22. The lifting height is determined by the specific construction environment.

[0057] It can be explained that, in order to improve the integration degree of the cross universal joint type connecting structure 2, the first shaft body 222 and the second shaft body 224 are integrally installed on the mounting block 231, and the first shaft body axis and the second shaft body axis are located in the same horizontal reference plane, at this time, the second shaft body fixing member 223 rotates around the second shaft body 224, and the rotation of the second shaft body fixing member 223 relative to the first shaft body fixing member 221 is realized.

[0058] Preferably, as shown in Figure 5 , the mounting block 231 is centrally arranged at the first shaft body 222 and centrally arranged at the second shaft body 224.

[0059] In one embodiment, as shown in Figure 2 and Figure 3 , the cross universal joint type connecting structure 2 further comprises first shaft body bearing intervals 225 and second shaft body bearing intervals 226, the first shaft body bearing intervals 225 are arranged in pairs and symmetrically distributed at the two ends of the first shaft body 222 arranged along the axis direction thereof; the second shaft body bearing intervals 226 are arranged in pairs and symmetrically distributed at the two ends of the second shaft body 224 arranged along the axis direction thereof; wherein any end of the first shaft body 222 arranged along the axis direction thereof is inserted into the first shaft body bearing interval 225, and any end of the second shaft body 224 arranged along the axis direction thereof is inserted into the second shaft body bearing interval 226.

[0060] In this way, by inserting the two ends of the first shaft body 222 arranged along the axis direction thereof and the two ends of the second shaft body 224 arranged along the axis direction thereof into the corresponding shaft body bearing intervals, the support structure of each shaft body can be enhanced, so that it can more stably bear the forces and moments from the platform body 1 and the seabed base 21.

[0061] Meanwhile, the shaft bearings are symmetrically arranged, so that the corresponding shafts are more uniformly stressed during rotation, and the stress concentration and fatigue damage caused by uneven stress are improved.

[0062] In one embodiment, as shown in Figure 4 Any shaft bearing is provided with a bearing base 227 for installing the bearing of the shaft.

[0063] In this way, by installing the bearing base 227 in each shaft bearing and installing the corresponding bearing 228 at the bearing base 227, the load capacity of the bearing 228 can be enhanced, and at the same time, reliable support for the shaft can be achieved, ensuring that the bearing 228 provides high rotation accuracy and stability for the shaft.

[0064] It can be explained that the shape of the bearing base 227 is not specifically limited. It can be square, circular ring, or at least one shape, as long as a cavity for accommodating the bearing 228 is provided inside.

[0065] It can be explained that the bearing 228 is preferably a cylindrical roller bearing. At this time, each bearing 228 is composed of an inner ring, an outer ring and a cylindrical rolling body, which mainly bears lateral (i.e. Figure 4 vertical direction) pressure.

[0066] Therefore, the detection end of the stress detection piece is installed in any bearing base 227, the detection end of the stress detection piece is used to detect the radial stress value of the bearing 228, the electrical connection end of the stress detection piece is electrically connected with the control terminal, and the stress detection piece is used to convert the radial stress value into a radial stress signal and transmit the radial stress signal to the control terminal, for judging whether the tension system is working normally.

[0067] In this way, by adding the radial stress detection piece, the radial load received by the bearing 228 during operation is monitored in real time, providing real-time data support for the operation and maintenance personnel, and timely discovering abnormal states of the bearing 228 during operation, such as excessive stress and stress fluctuation, so as to early warn potential faults for the operation and maintenance personnel, and make more accurate decisions in time, preventing safety accidents caused by bearing 228 damage.

[0068] Specifically, the detection end of the stress detection piece is located on the inner wall of the cavity of the bearing base 227 and abuts against the outer wall of the outer ring of the bearing 228.

[0069] In one embodiment, any shaft bearing is selected as a watertight cabin.

[0070] Such a configuration makes each shaft bearing room a watertight compartment, thereby reducing the penetration of moisture into the bearing room, preventing moisture from coming into contact with the metal structure in the bearing room, reducing the risk of corrosion, avoiding bearing 228 damage and mechanical failure due to moisture erosion, extending the service life of the universal joint, and improving economic benefits.

[0071] Furthermore, a plurality of seals 229 are provided at the water outlet of the bearings between any shaft bearings, and the plurality of seals 229 are spaced apart along the axial direction of the shaft to form a plurality of gaps, and the plurality of gaps are used to arrange the detection end of the pressure detection component 31, and the detection end of the pressure detection component 31 is used to detect the pressure value at the location and convert it into a pressure signal; the universal joint type connection device for connecting the offshore wind turbine platform to the seabed also includes a control terminal, which is electrically connected to the electrical connection end of the pressure detection component 31, and the control terminal is used to receive the pressure signal fed back by the pressure detection component 31 and convert it into a pressure value, and the control terminal is preset with a pressure difference threshold.

[0072] In this arrangement, since each shaft-bearing compartment is configured as a watertight compartment, it needs to be sealed. For example, a plurality of seals 229 spaced along the axis of the shaft are provided at the water outlet of each shaft-bearing compartment to form multiple lines of defense, effectively preventing moisture and other impurities from entering the interior of the bearing compartment and improving the sealing performance.

[0073] Since two adjacent seals 229 are spaced apart in the axial direction of the shaft, multiple gaps appear. By providing a detection end of a pressure detection component 31 at each gap, each pressure detection component 31 can monitor the hydraulic pressure at the gap in real time. By feeding back the measured hydraulic load data to the control terminal, multiple groups of adjacent gap hydraulic pressure differences can be formed. After comparing each group of hydraulic pressure differences with the preset hydraulic pressure difference threshold, it is determined whether the water tightness of each bearing 228 is normal, so that operation and maintenance personnel can make more accurate decisions.

[0074] That is, by real-time monitoring and early warning of the hydraulic pressure in the gaps between each bearing 228, the watertightness of the bearing 228 can be confirmed in real time, and then it can be determined whether the bearing 228 has any abnormalities during use, thereby building a stable sealing environment and pressure monitoring mechanism, which helps to improve the operating stability of the entire universal joint and reduce downtime caused by failures.

[0075] Furthermore, to improve the efficiency of lubricating oil reuse, it is necessary to recover the lubricating oil after lubrication. In this case, an oil-water separator 6 is added, and the inlet of the oil-water separator 6 is connected to each shaft bearing using pipes to separate the water and oil mixture. The separated water is discharged through a drainage structure such as a drainage pipe, while the separated lubricating oil is drained into the oil reservoir 42 for storage and recovery for subsequent reuse.

[0076] Preferably, the control terminal is selected as a signal acquisition instrument for collecting pressure signals and stress signals and converting them into corresponding pressure values and stress values for analysis by the operation and maintenance personnel. For example, the water tightness of the bearing 228 can be determined by the hydraulic pressure difference corresponding to the adjacent gap.

[0077] It can be explained that the hydraulic pressure difference mentioned in the above embodiment can be the hydraulic pressure difference measured by the detection ends of two adjacent pressure detection members 31, or the hydraulic pressure difference measured by the detection ends of two pressure detection members 31 arranged at intervals.

[0078] In one embodiment, a fluid channel 41 extending along the axis direction is formed inside any shaft body; the universal joint type connecting device for connecting the offshore wind turbine platform to the seabed further comprises an oil storage member 42 for storing lubricating oil, the oil storage member 42 is installed at the platform body 1, and the fluid channel 41 is communicated with the oil outlet of the oil storage member 42 through an oil delivery pipe member 43.

[0079] In this way, by forming a fluid channel 41 extending along the axis direction inside each shaft body, and using an oil delivery pipe member 43 to communicate the fluid channel 41 with the oil outlet of the oil storage member 42 located at the platform body 1, the lubricating oil stored in the oil storage member 42 can be continuously and stably delivered to the inside of the shaft body through the fluid channel 41, and then distributed uniformly on the surface of the shaft body along the gap between the shaft and the bearing, thereby improving the lubrication effect and reducing friction and wear during the operation of the shaft body.

[0080] At the same time, by adopting this design, the addition of lubricating oil is more simple and convenient, and the cost and time for maintaining the shaft body are reduced.

[0081] In addition, the lubricating oil has certain viscosity, so it has certain water tightness.

[0082] Preferably, the oil storage member 42 is preferably a gravity oil tank.

[0083] As shown in Figure 5 Since the first shaft body 222 and the second shaft body 224 are integrally installed at the mounting block 231, and the mounting block 231 is centrally arranged at the first shaft body 222 along the direction of the first shaft body axis, and is centrally arranged at the second shaft body 224 along the direction of the second shaft body axis, it is preferable that an oil injection hole 232 is formed at the mounting block 231, and the oil injection hole 232 is communicated with the fluid channel 41 of the first shaft body 222 and the fluid channel 41 of the second shaft body 224.

[0084] In this way, the flow path of the lubricating oil can be improved, so that the lubricating oil can flow quickly and uniformly into the first shaft body 222 and the second shaft body 224, and the lubricating path of the lubricating oil can be greatly shortened, and the lubricating efficiency can be improved.

[0085] It can be explained that in the embodiment, the second shaft body fixing member 223 is provided with a pair of first connecting holes arranged at intervals, the first shaft body fixing member 221 is provided with a pair of second connecting holes arranged at intervals, and the line between the pair of first connecting holes and the line between the pair of second connecting holes are arranged to intersect in the projection of the horizontal reference plane. At this time, the first connecting hole is matched with the outer arc wall surface of the second shaft body 224, and the second connecting hole is matched with the outer arc wall surface of the first shaft body 222.

[0086] During installation, the first shaft body 222 is inserted into the pair of second connecting holes along the axial direction, and the second shaft body 224 is inserted into the pair of first connecting holes along the axial direction, so as to realize the fixation between the first shaft body fixing member 221 and the second shaft body fixing member 223.

[0087] It can be explained that the horizontal reference plane is defined as the reference plane in the horizontal direction as shown in Figure 1

[0088] After the installation of each shaft body, the first shaft body axis and the second shaft body axis are parallel to the horizontal reference plane.

[0089] Preferably, the first shaft body axis is perpendicular to the second shaft body axis.

[0090] Obviously, the above-mentioned embodiments are only examples for clearly explaining, and are not limitations to the embodiments. Based on the above-mentioned description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.​

Claims

1. A universal joint connection device for connecting an offshore wind turbine platform to the seabed, characterized in that: include: A cross universal joint type connection structure (2), the cross universal joint type connection structure (2) being installed at the bottom of the platform body (1) of the column type floating wind turbine generator set, and the cross universal joint type connection structure (2) being used as a swing center, and the cross universal joint type connection structure (2) being swingably installed on the seabed; The cross universal joint type connection structure (2) includes a seabed base (21) and a universal joint assembly (22), wherein the seabed base (21) is fixed on the seabed; the universal joint assembly (22) includes a first shaft fixing member (221), a first shaft (222), a second shaft fixing member (223) and a second shaft (224), wherein the first shaft fixing member (221) is mounted on the top of the seabed base (21), the first shaft (222) is mounted on the first shaft fixing member (221), the second shaft fixing member (223) is mounted on the bottom of the platform body (1), the second shaft (224) is mounted on the second shaft fixing member (223), and the second shaft fixing member (223) rotates around the central axis of the second shaft (224); wherein the projections of the first shaft (222) and the second shaft (224) in the horizontal reference plane are arranged crosswise; The cross universal joint type connection structure (2) further includes a first shaft bearing space (225), a second shaft bearing space (226) and a bearing base (227), wherein the first shaft bearing space (225) is arranged in pairs and symmetrically distributed at the two ends of the first shaft (222) arranged along its axial direction; the second shaft bearing space (226) is arranged in pairs and symmetrically distributed at the two ends of the second shaft (224) arranged along its axial direction; wherein any end of the first shaft (222) arranged along its axial direction is plugged into the first shaft bearing space (225), and any end of the second shaft (224) arranged along its axial direction is plugged into the second shaft bearing space (226), and a bearing base (227) is installed in any shaft bearing space, and the bearing base (227) is used to install the bearing (228) of the shaft; Among them, any shaft bearing room is a watertight compartment, and a plurality of sealing members (229) are provided at the water outlet of the bearings of any shaft bearing room, and the plurality of sealing members (229) are arranged at intervals along the axis direction of the shaft to form a plurality of gaps, and the plurality of gaps are used to arrange the detection end of the pressure detection member (31), and the detection end of the pressure detection member (31) is used to detect the pressure value at the location and convert it into a pressure signal, and the electrical connection end of the pressure detection member (31) is electrically connected to the control terminal to transmit the pressure signal to the control terminal.

2. A universal joint connection device for connecting an offshore wind turbine platform to the seabed according to claim 1, characterized in that: A fluid channel (41) extending along the axial direction is provided inside any shaft body, and the fluid channel (41) is connected to the oil outlet of the oil storage component (42) through an oil delivery pipe component (43).

3. The universal joint connection device for connecting an offshore wind turbine platform to the seabed according to claim 1, characterized in that: A detection end of a stress detection component is installed on any bearing base (227), and the detection end of the stress detection component is used to detect the radial stress value of the bearing (228). The electrical connection end of the stress detection component is electrically connected to the control terminal, and the stress detection component is used to convert the radial stress value into a radial stress signal and transmit the radial stress signal to the control terminal.

4. The universal joint connection device for connecting an offshore wind turbine platform to the seabed according to claim 3, characterized in that: The cross universal joint type connection structure (2) further comprises: A mounting block (231) is used for integrally mounting the first shaft bearing space (225) and the second shaft bearing space (226).

5. The universal joint connection device for connecting an offshore wind turbine platform to the seabed according to claim 4, characterized in that: The mounting block (231) is provided with an oil filling hole (232), and the oil filling hole (232) is in communication with the fluid channel (41) of the first shaft body (222) and the fluid channel (41) of the second shaft body (224).

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