CN204357630U - A kind of pile foundation vertical shaft direct drive tidal power generating device - Google Patents

Abstract

The purpose of this utility model is to provide a pile foundation vertical shaft direct-drive tidal current energy generating device, which includes a pile foundation, an inner shaft cylinder, an outer shaft cylinder, a wheel hub, blades, and a nacelle. The outer shaft tube is set outside the inner shaft tube and fits with the inner shaft tube through bearings. The upper end of the inner shaft tube is fixedly connected with the engine room, and the inner rotor is fixedly installed on the upper end of the outer shaft tube. The engine room is fixed on the pile Basically, the outer stator is fixed in the nacelle, the outer stator is located outside the inner rotor, the hub is fixed outside the outer shaft, and the blades are connected to the hub through the spokes. The pile foundation includes the upper section, the middle section, and the lower section. Above the sea surface, the middle section of the pile foundation is located under the sea surface, and the blades, hubs, and spokes are located at the middle section of the pile foundation. The utility model has better start-up performance and power generation performance, lower cost in terms of hoisting and maintenance, and is a vertical-axis tidal current energy power generation device that can be developed in the direction of large-scale.

Description

A pile foundation vertical shaft direct drive tidal current energy generation device

technical field

The utility model relates to a power generation device, specifically a tidal current power generation device.

Background technique

The ocean area accounts for 71% of the total area of the earth. Most of the energy from the universe that reaches the earth falls on the sky above the ocean and in the sea water, and some of it is converted into various forms of ocean energy. Most of the ocean's energy comes from the sun's radiation and the moon's gravitational pull. Ocean energy is a clean and renewable energy. The development and utilization of ocean energy is of great significance to alleviate the energy crisis and environmental pollution. As a kind of ocean energy, tidal current energy has the incomparable sustainability and regularity of other ocean energy. At present, countries all over the world are gradually increasing their research and investment in tidal current energy power generation technology. A tidal current energy generating device is a device that converts tidal current energy into electric energy output. The rotation axis of the impeller of the vertical axis tidal current energy generating device is perpendicular to the sea level. Compared with the horizontal-axis tidal energy device, the impeller of the vertical-axis tidal energy generation device has good startability, does not require high water depth, and is not affected by the direction of flow during operation. The control mechanism is relatively simple, and the efficiency is high. attention of researchers. The currently designed large-scale tidal current energy generation devices are often composed of a series of components such as impellers, speed-increasing boxes, and generators. The structure is complex, resulting in low stability and high failure rate of the equipment.

According to the form of power generation platform, it can be divided into floating type and fixed base type. In the patented high-power vertical-axis tidal current power generation device with the publication number CN101988463A, a universal hinge is used to connect the machine base with the gravity tower to fix the unit. This design allows the main shaft to tilt in the environment of huge wind and waves. Even put it in order to protect the unit, but it does not have obvious significance for the environment with rich tidal energy resources such as my country's offshore areas and rivers, but the wind and waves are not complicated and huge. At the same time, because the platform is unstable or the platform is placed underwater The reason is that the equipment needs to be hoisted when the unit is overhauled and maintained, which consumes a lot of manpower and material resources, resulting in a low overall benefit. Therefore, how to improve the stability of the large-scale tidal current energy generating device and facilitate the maintenance of the unit has become a technical problem to be solved by those skilled in the art.

The patent with the publication number CN102128128A mentions a permanent magnet direct-drive tidal current power generation device, which adopts a horizontal shaft structure as a whole. After the blades and the hub are welded, they are fixed with the rotor shaft by key connection to drive the rotor shaft to rotate. magnets, so as to produce the effect that the impeller directly drives the permanent magnet generator to generate electricity. The design of the nacelle in the device is divided into multiple sections, and the front and rear shrouds are installed. This structural design leads to a complicated assembly process for the original simple design of the entire device, and the welding process of the blades and hubs in this structural design is not suitable for use. In the corrosive seawater environment, the entire device is placed underwater, and there are considerable restrictions on the requirements of the sea area.

Contents of the invention

The purpose of the utility model is to provide a pile foundation vertical shaft direct-drive tidal current energy generating device with better start-up performance and power generation performance.

The purpose of this utility model is achieved in that:

The utility model is a pile foundation vertical shaft direct drive type tidal current energy generating device, which is characterized in that it includes a pile foundation, an inner shaft cylinder, an outer shaft cylinder, a wheel hub, blades, and a nacelle, and the inner shaft cylinder is set outside the pile foundation and connected with the pile foundation The outer shaft tube is set outside the inner shaft tube and fits with the inner shaft tube through bearings. The upper end of the inner shaft tube is fixedly connected with the engine room, and the upper end of the outer shaft tube is fixedly installed with the inner rotor. The engine room is fixed on the pile Basically, the outer stator is fixed in the nacelle, the outer stator is located outside the inner rotor, the hub is fixed outside the outer shaft, and the blades are connected to the hub through the spokes. The pile foundation includes the upper section, the middle section, and the lower section. Above the sea surface, the middle section of the pile foundation is located under the sea surface, and the blades, hubs, and spokes are located at the middle section of the pile foundation.

The utility model can also include:

1. The above-mentioned bearings are seawater lubricated bearings or non-water lubricated bearings. When non-water lubricated bearings are used, a sealed bushing to prevent seawater from infiltrating is installed between the inner shaft cylinder and the outer shaft cylinder.

2. The pile foundation is provided with a hollow structure for maintenance and storage of control equipment.

The advantage of the utility model is that: aiming at the technical defects in the existing tidal current power generation device, the utility model proposes a pile-based vertical shaft direct-drive tidal current power generation device, and adopts the carrier form of a single pile support structure to improve the overall tidal current power generation. The stability of the device and the complexity of the installation process are reduced; the inner space of the pile foundation is transformed, and the control elements are placed in it, which makes the maintenance of the unit simple and easy; the integrated structure of the unit is adopted, eliminating the need for tidal current energy generation The gearbox and other components of the hydraulic turbine set use the main shaft of the hydraulic turbine to directly and synchronously drive the generator rotor, which minimizes the volume of the tidal current energy generation device, simplifies the structure of the unit, and improves the reliability and service life of the unit. This type of tidal current energy generation device has wide adaptability to sea areas, good self-starting performance, easy installation and commissioning, and reduces unit manufacturing and construction costs. It will be the main development trend of tidal current energy generation devices in the future.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is A-A view.

Detailed ways

The utility model is described in more detail below in conjunction with accompanying drawing example:

Combined with Figures 1-2, the utility model provides a pile foundation vertical shaft direct-drive tidal current power generation device, which is mainly composed of pile foundation 1, impeller and generator cabin and other main components, and is a tidal current suitable for low flow rate and high power Energy generating device.

The lower end of the pile foundation 1 of the tidal current generating device is driven into the seabed, the upper end protrudes from the sea surface, and the top end is the engine room 9 and the end cover outer cover. All components other than the pile foundation 1 form a whole, which can be installed and disassembled uniformly. The shaft system of the impeller includes an inner shaft cylinder 11 and an outer shaft cylinder 2 . The inner shaft cylinder 11 is sleeved on the pile foundation 1, and there is no relative movement between the two. The outer shaft cylinder 2 and the inner shaft cylinder 11 are fixed by a bearing set. The hub 3 is fixed on the outer shaft tube 2, and the hub 3 is connected with the blades 4 through the spokes 6, and generally three or four blades are used.

As shown in Fig. 1 and Fig. 2, when the tidal current energy generating device is working, the blade 4 absorbs the kinetic energy of the incoming tidal current, pushes the outer shaft tube 2 of the impeller to rotate, and drives the inner rotor 8 of the nacelle 9 to rotate. The outer stator 7 is fixedly connected with the nacelle 9, and the nacelle 9 is fixed on the pile foundation 1. Bearing 5 can be selected from two schemes of seawater lubricated bearing or non-water lubricated bearing; if a non-water lubricated bearing group is used, a sealing bushing is installed between the inner shaft cylinder 11 and the outer shaft cylinder 2 to prevent seawater from infiltrating. Some necessary control equipment can be installed inside the pile foundation 1. When repairing the tidal current energy generating device, the maintenance personnel can open the cover cover on the top of the pile foundation 1, and then enter the inside of the pile foundation 1 to maintain and maintain the control equipment.

As shown in Figure 1, in addition to the above, the outer 7 stator and inner rotor 8 of the pile foundation vertical axis direct drive tidal current energy generation device are far away from the sea level, and there is no need to install professional mechanical dynamic seals or high-quality O-ring seals circle, there is no need to worry about seawater entering the cabin body 9 of the generator, which will affect the normal operation of the tidal current energy generating device.

After selecting the appropriate water depth, install the pile-based vertical shaft direct-drive tidal current power generation device in a water channel with reciprocating flow characteristics. When the tidal current speed reaches the start-up speed, the impeller rotates under the impact of the tidal current, and the inner rotor is driven to rotate by the outer shaft cylinder generate electricity. At the same time, the device can also adapt to the two-way flow of tidal current energy, without the need to design a convection mechanism of the water turbine unit or a pitch-changing mechanism of the blades.

The utility model provides a pile foundation vertical shaft direct-drive tidal current power generation device, which mainly adopts single pile support technology, straight blade technology, synchronous power generation technology and water lubricated bearing transmission technology. The inner rotor of the permanent magnet synchronous generator is directly connected with the outer shaft cylinder, which can eliminate the transmission part of the gearbox. The whole device is divided into three parts: pile foundation carrier, impeller and generator set. The shaft of the pile foundation is a hollow structure, which is used to install some necessary control equipment. When repairing the tidal current energy generation device, the maintenance personnel can open the cover cover on the top of the pile foundation, and then enter the inside of the pile foundation to maintain and maintain the control equipment. The pile foundation is divided into upper, middle and lower sections, the lower end is driven into the seabed and fixed, the middle part is equipped with an impeller structure, and the upper end is exposed to the sea surface and installed with a generator cabin and an end cover cover. All parts other than the pile foundation form a whole, and the pile foundation shaft passes through and is fixed at the upper end, which can be installed and disassembled uniformly. The impeller structure is mainly composed of blades, spokes, hubs, inner shaft and outer shaft, wherein the inner shaft is fixed on the pile, and the outer sleeve is connected with the inner rotor of the synchronous generator. The hub is fixed on the outer shaft tube, and the hub is connected with the blades through the spokes. The generator set is mainly composed of a nacelle, an outer stator and an inner rotor, the outer stator is fixedly connected with the nacelle, and the nacelle is fixed on the pile foundation. When the tidal current energy generating device is working, the blades absorb the incoming flow energy, push the outer shaft of the impeller to rotate, and drive the inner rotor of the nacelle to rotate.

The advantage of the utility model is that: compared with the swingable carrier structure in which the universal ball joint and the anchor chain are combined in the utility model patent whose publication number is CN101988463A, the utility model adopts the fixed single pile support technology to avoid the device from being caused by water flow, The swing caused by wind and waves improves the working stability of the whole device, and is more suitable for the tidal current environment in China's shallow sea area; compared with the horizontal axis structure and the cabin split design in the utility model patent of publication number CN102128128A, the utility model adopts In addition to the integrated design of the pile foundation carrier, the volume of the engine room is significantly reduced; and the generator room is exposed to the sea surface, reducing the sealing requirements; the vertical shaft structure has good self-starting performance.

Claims (3)

1. A pile foundation vertical shaft direct drive tidal current energy generating device is characterized in that: it includes a pile foundation, an inner shaft cylinder, an outer shaft cylinder, a wheel hub, blades, and a nacelle, and the inner shaft cylinder is sleeved outside the pile foundation and connected to the pile foundation. The interphase is fixed, the outer shaft tube is set outside the inner shaft tube and fits with the inner shaft tube through bearings, the upper end of the inner shaft tube is fixedly connected with the engine room, the upper end of the outer shaft tube is fixedly installed with the inner rotor, and the engine room is fixed on the pile foundation Above, the outer stator is fixed in the engine room, the outer stator is located outside the inner rotor, the hub is fixed outside the outer shaft, and the blades are connected to the hub through the spokes. The pile foundation includes the upper section, the middle section, and the lower section. The upper section of the pile foundation and the engine room are located on the sea surface Above, the middle section of the pile foundation is located under the sea surface, and the blades, hubs, and spokes are located at the middle section of the pile foundation. 2. A pile foundation vertical shaft direct-drive tidal current energy generating device according to claim 1, characterized in that: the bearing is a seawater lubricated bearing or a non-water lubricated bearing, and when a non-water lubricated bearing is used, the inner shaft cylinder A sealing sleeve to prevent the infiltration of seawater is installed between the outer shaft cylinder and the outer shaft cylinder. 3. A pile foundation vertical shaft direct drive tidal current energy generating device according to claim 1 or 2, characterized in that: the pile foundation is provided with a hollow structure for maintenance and storage of control equipment.