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CN-116006381-B - Double-serial blunt body vortex-induced vibration renewable energy collection system based on swing

CN116006381BCN 116006381 BCN116006381 BCN 116006381BCN-116006381-B

Abstract

The invention discloses a vibration-based double-serial blunt body vortex-induced vibration renewable energy collection system which comprises a serial double-blunt body vortex-induced vibration device 1, a speed-increasing gear set 2 and a generator system 3, wherein the serial double-blunt body vortex-induced vibration device 1 is provided with two blunt bodies which are arranged in series along the ocean current flowing direction and are arranged vertically and telescopic swing arms 1-3 at two ends of the blunt bodies, an upstream blunt body is provided with an inner layer and an outer layer, the inner layer is a transmission rotating shaft 1-1-1, the outer layer is an upstream blunt body shell 1-1, the downstream blunt body is a downstream blunt body shell 1-2, the upper end and the lower end of the transmission rotating shaft 1-1-1 are respectively connected with the telescopic lower swing arm 1-3-1 through the telescopic upper swing arm 1-3-2, the gear set 2 and the generator system 3 are sequentially arranged above the transmission rotating shaft 1-1-1 and are coaxial with the transmission rotating shaft 1-1-1, the problems that the linear vibration of a single object possibly exists, such as self-locking and friction force is large are avoided, the influence of the environment on the power generation system on the environment is reduced, and the high environmental requirements are met.

Inventors

  • YANG WENCHAO
  • ZHANG CHENAN
  • WANG FUDE

Assignees

  • 中国科学院力学研究所

Dates

Publication Date
20260505
Application Date
20230116

Claims (6)

  1. 1. A vibration-based double-serial blunt body vortex-induced vibration renewable energy collection system is characterized by comprising a serial double-blunt body vortex-induced vibration device (1), a speed-increasing gear set (2) and a generator system (3), wherein the serial double-blunt body vortex-induced vibration device (1) is provided with two blunt bodies which are arranged in series along the ocean current flowing direction and are vertically arranged and telescopic swing arms (1-3) at two ends of the blunt bodies, an upstream blunt body is provided with an inner layer and an outer layer, the inner layer is a transmission rotating shaft (1-1-1), the outer layer is an upstream blunt body shell (1-1), the downstream blunt body is a downstream blunt body shell (1-2), the transmission rotating shaft (1-1-1) and the downstream blunt body shell (1-2) are respectively connected at the upper end and the lower end through the telescopic upper swing arm (1-3-2) and the telescopic lower swing arm (1-3-1), and the speed-increasing gear set (2) and the generator system (3) are sequentially arranged above the transmission rotating shaft (1-1-1) and coaxially arranged with the transmission rotating shaft (1-1-1-1). The flow vortex structure is generated by the upstream blunt body shell (1-1) as a vortex generator, the flow vortex structure is generated from the surface of the upstream blunt body shell (1-1), the upstream blunt body shell (1-1) is basically kept static in the vortex generation process, fluid is divided into two parts through the upstream blunt body shell (1-1) to form an alternating vortex structure, the downstream blunt body shell (1-2) is used as a vibrator, the downstream blunt body shell is induced by the flow vortex transmitted by the upstream blunt body shell (1-1) to generate continuous circumferential vibration, the vibration of the downstream blunt body shell (1-2) drives the transmission rotating shaft (1-1-1) to rotate, the vibration of the downstream blunt body shell (1-2) is transmitted to the transmission rotating shaft (1-1-1) of the upstream blunt body shell (1-1) through the telescopic lower swing arm (1-3-1), the transmission rotating shaft (1-1) transmits the vibration to the speed increasing gear set (2), the speed increasing gear set (2) accelerates the rotation and then inputs the rotation to the generator system (3), and the generator system (3) converts the electric energy into kinetic energy, so that the whole energy conversion process is completed; The telescopic swing arms (1-3) are used for matching different flow rates and water depths, the optimal blunt body spacing is different under different flow rates, and if the water depths are not enough to drive vibration, the vortex-induced vibration is ensured to be realized by increasing the moment by adjusting the spacing; The upstream blunt body shell (1-1) is fixedly connected with the fixed flange (4) through the through hole (1-1-3) connected with the fixed flange, and the upstream blunt body shell (1-1) is fixedly connected with the transmission rotating shaft connecting sleeve (1-1-2) through the through hole (1-1-4) connected with the transmission rotating shaft connecting sleeve; An annular groove (1-1-2-1) matched with the fixed flange (4) is processed on the outer surface of the transmission rotating shaft connecting sleeve (1-1-2) close to the lower end, the annular groove (1-1-2-1) is used for being embedded into the two semicircular fixed flanges (4), a plurality of rotating shaft connecting sleeve threaded holes (1-1-2-2) with certain circumferential intervals are further formed in the outer surface below the transmission rotating shaft connecting sleeve (1-1-2) and are used for being fixedly connected with the upstream blunt body shell (1-1); the telescopic swing arm (1-3) comprises a telescopic upper swing arm (1-3-2) and a telescopic lower swing arm (1-3-1), wherein the telescopic upper swing arm (1-3-2) or the telescopic lower swing arm (1-3-1) is respectively composed of three parts, namely two stainless steel plates with racks on one side and one stainless steel plate with racks on the two sides, and the length change of the telescopic swing arm is realized by adjusting the meshing position of the racks; The upstream blunt body shell (1-1) and the transmission rotating shaft connecting sleeve (1-1-2) are in a non-fixedly connected mode, the non-fixedly connected mode is used for occasions with changed ocean current direction when seasons are changed, when the ocean current direction is changed, an included angle is formed between the position of a groove on the upstream blunt body shell (1-1) and the ocean current direction, the normal swinging range of the telescopic upper swinging arm can be limited, in order not to influence the normal swinging of the telescopic upper swinging arm (1-3-2), the non-fixedly connected mode is adopted, when the ocean current direction is changed, the telescopic upper swinging arm can finely adjust the direction of the groove (1-1-5) of the upstream blunt body shell (1-1) through a plurality of small-intensity collisions with the edge of the groove of the upstream blunt body shell (1-1), so that the change of the ocean current direction can drive the upstream blunt body shell (1-1) to rotate, and the position of the groove (1-1-5) on the upstream blunt body shell (1-1) can be matched with the ocean current direction, and the movement space of the telescopic upper swinging arm can be ensured; when the fixing mode is adopted, the screw is inserted into the through hole (1-1-4) connected with the transmission rotating shaft connecting sleeve for fixing, and when the non-fixing mode is adopted, the screw is not required to be inserted into the through hole.
  2. 2. A wobble-based dual serial blunt body vortex-induced vibration renewable energy collection system according to claim 1, wherein the upstream blunt body shell (1-1) comprises an upstream cylindrical shell, an upstream elliptical shell, a rounded upstream triangular shell, or a rounded upstream Fang Zhuke, and the downstream blunt body shell (1-2) comprises a downstream cylindrical shell, a downstream elliptical shell, a rounded downstream triangular shell, or a rounded downstream Fang Zhuke.
  3. 3. A wobble-based dual serial blunt body vortex induced vibration renewable energy collection system according to claim 1, wherein the downstream blunt body shell (1-2) continuously performs circumferential wobbling, which is embodied as single degree of freedom reciprocating wobbling, and the driving force and restoring force of the wobbling are generated by the swirling action of the flow transmitted from the upstream blunt body shell (1-1) on the surface of the downstream blunt body shell (1-2).
  4. 4. The vibration-based dual serial blunt body vortex induced vibration renewable energy collection system according to claim 1, wherein the height and diameter of the upstream blunt body shell (1-1) and the downstream blunt body shell (1-2) are determined according to the level of energy output and the actual flow environment, wherein the height is in the order of meters at watt level energy output and the height is in the order of tens of meters at kilowatt level energy output.
  5. 5. A vibration renewable energy collecting system based on double serial blunt body vortex-induced vibration of swinging according to claim 1, wherein said speed increasing gear set comprises a big gear set (2-1), a small gear set (2-2) and a ratchet wheel set (2-3), the diameters and the numbers of teeth of the small gear set (2-2) and the ratchet wheel set (2-3) are the same, said big gear set (2-1), small gear set (2-2) and ratchet wheel set (2-3) are respectively arranged from bottom to top in axial direction The device comprises a first large gear, a second large gear, a first small gear, a second small gear, a first ratchet wheel and a second ratchet wheel, wherein the first large gear is meshed with the first ratchet wheel, the second large gear is meshed with the second small gear, the first small gear is meshed with the second ratchet wheel, the first ratchet wheel and the second ratchet wheel of the ratchet wheel set (2-3) ensure that only one-direction motion of two reciprocating motions can be finally transmitted to a generator, and further ensure that the motion of the two ratchet wheels transmitted to a generator shaft (3-1) is one-direction rotation.
  6. 6. A wobble-based dual serial blunt body whirl-excited vibration renewable energy collection system according to claim 5, wherein the first ratchet and the second ratchet each have a half cycle of motion which can be transmitted to a generator shaft (3-1), and the combination forms a single direction of rotation, specifically, when the first ratchet outputs power in the half cycle, the second ratchet only rotates in a reverse direction without outputting energy to the generator in the half cycle, when the second ratchet outputs power in the half cycle, the first ratchet only rotates in a reverse direction without doing work in the half cycle, the small gear set (2-2) is used for changing the reciprocating rotation direction of the second ratchet, the rotation direction of the first ratchet is opposite to the rotation direction of the large gear set (2-1), the second ratchet is in the same direction as the large gear set (2-1) because of indirect contact through the small gear set (2-2) and the large gear set, the reciprocating rotation direction of the first ratchet is always opposite to the first ratchet, the first ratchet is always opposite to the reciprocating rotation direction, and the small gear set (2-1) can continuously transmit the power to the small gear set (2-2) through one direction of the small gear set, and the small gear set (2-1) can continuously rotate to the small gear set (2-2) with the same amount as the small gear set (2-1).

Description

Double-serial blunt body vortex-induced vibration renewable energy collection system based on swing Technical Field The invention belongs to the technical field of renewable energy sources, and particularly relates to a double-serial blunt body vortex-induced vibration renewable energy collection system based on swing. Background In nature, a large amount of low-grade flow energy is to be developed, the average flow velocity of the tributaries of most small and medium rivers is less than 1m/s, and most water turbines can realize high-efficiency power generation only by 1.5m/s, so that coastal areas in China, particularly the north, have a great deal of sea areas with ocean tide flow velocity of about 1 m/s. Low flow rates and shallow depths render large amounts of water resources unavailable, and therefore, there is a need to develop new renewable energy harvesting systems suitable for low flow conditions. A great deal of research on ocean engineering shows that under the condition of low flow velocity of ocean risers, offshore platforms, cables and bridges, when fluid flows through the structures, flow fields formed after the structures have strong pulsation change characteristics, the pulsation flow can enable the structures to generate periodic oscillation movement, and flow energy collection under the condition of low flow velocity can be realized by converting kinetic energy of the oscillation into electric energy. Vortex-induced vibration energy collection concepts, although theoretically capable of collecting low-grade flow energy, have encountered many engineering difficulties in the very last decade of their birth, making them difficult to popularize in a wide range of practical applications. It is therefore necessary to propose new designs in terms of conceptual design to solve the difficulties in practical operation at reduced cost. One of the difficulties of vortex-induced vibration energy collection devices is that the conventional vibration device is mostly in linear reciprocating vibration in the vertical direction, so that two parallel guide rails along the vertical direction are required to be used as constraint support mechanisms, as shown in fig. 1, the incoming flow direction is perpendicular to the paper surface, when the incoming flow direction vertically impacts a cylinder, the cylinder vertically reciprocates along the parallel double rails on two sides, and as self-locking phenomenon easily occurs on mechanics of the parallel double rails on two sides, especially impurities such as underwater sediment are easily deposited on the guide rails, so that friction force is increased in the running process of the device, and energy collection efficiency is reduced. The adoption of the high-precision guide rail and the moving part can solve the friction problems such as self-locking to a certain extent, but the high processing cost makes the energy collecting device difficult to popularize on a large scale. The vortex-induced vibration principle requires that the vibration direction is perpendicular to the incoming flow direction, and the vibrator of the conventional vibration device can only move in a single direction, for example, the vibrator can only move between two parallel guide rails in the vertical direction at a fixed position, so that the condition that the vibration direction is perpendicular to the incoming flow direction is easier to meet in a river channel, but ocean currents on the seabed and the like can change along with the season. Because the existing vibrating device can not change the movement direction of the vibrator along with the change of seasons, the vibrating direction of the vibrator can not be always kept perpendicular to the incoming flow direction along with the change of seasons, and therefore, the energy can not be efficiently collected at certain time in practical application. Disclosure of Invention The invention provides a double-serial blunt body vortex-induced vibration renewable energy collection system based on swing, which aims to solve the problem of self-locking caused by a sliding rail of a traditional vortex-induced vibration device, and the device can adapt to change of flow direction, so that the high-efficiency recovery of fluid kinetic energy is realized under various flows as much as possible. The invention provides the following technical scheme for solving the technical problems: The double-serial blunt body vortex-induced vibration renewable energy collection system based on swinging is characterized by comprising a serial double-blunt body vortex-induced vibration device 1, a speed-increasing gear set 2 and a generator system 3, wherein the serial double-blunt body vortex-induced vibration device 1 is provided with two blunt bodies which are arranged in series along the ocean current flowing direction and are vertically arranged and telescopic swing arms 1-3 at two ends of the blunt bodies, an upstream blunt body is provided with an in