A pitch-variable mechanism of a helical auxiliary drive type horizontal-axis ocean current energy generating set

Abstract

A pitch-changing mechanism for a horizontal-axis current energy generator set with a screw pair transmission, including a hub, the hub includes a hub wall, and a front end cover arranged at the front end of the hub wall, and three rotatable screws are evenly distributed on the peripheral surface of the hub wall shaft, the outer end of the screw shaft is connected to the blade, the inner end of the screw shaft is connected to the core bearing seat through the second pitch bearing, and a nut is set on the screw shaft; the core bearing seat is axially arranged in the hub wall, and the core The outer end of the outer bearing seat is fixedly connected with the rear end of the hub wall, and the inner end is connected with a three-way hydraulic cylinder with three-way synchronous movement. The three piston rods of the three-way hydraulic cylinder are respectively connected with the corresponding nuts to drive the nut to move linearly to drive the screw rod. The shaft turns. The invention converts the linear movement of the hydraulic cylinder into the rotary motion of the blades, realizes the 360-degree synchronous adjustment of the pitch angle of the blades in the ocean current energy generator set, facilitates the control of the pitch change of the entire unit, and improves the unit's ability to control the ocean current. Adaptability and pitch bearing life.

Description

technical field [0001] The invention belongs to the field of new energy utilization, and in particular relates to a pitch-changing mechanism of a spiral auxiliary transmission type horizontal-axis ocean current energy generating set. Background technique [0002] In the field of new energy utilization, ocean current energy is a kind of high energy density, pollution-free, green and renewable energy. The development and utilization of ocean current energy is of great significance to alleviate the energy crisis and reduce environmental pollution. The ocean current energy generator set converts the kinetic energy of the fluid medium (seawater) into the kinetic energy of the impeller through the impeller, and then further converts it into electrical energy. Pitch change (that is, changing the pitch angle of the blades) is a key technology in ocean current energy power generation devices. By changing the pitch, more ocean current energy can be captured, thereby increasing the pow...

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Problems solved by technology

[0003] There are mainly the following types of existing sea current energy variable pitch mechanisms: 1. Electric pitch variable mechanism: each blade is composed of an electric motor and a reduction gear box to adjust the pitch of the blades. Angle, this kind of pitch structure is more suitable for independent pitch, but it needs a larger internal space of the hub, and the load on the main shaft caused by the weight increase of the pitch mechanism is also relatively large, this structure is more complicated, The cost is also high; 2. Crank-slider mechanism: This mechanism uses hydraulic pressure as power, but because the crank-slider mechanism itself has a dead point, the pitch angle of the mechanism is less than or equal to 180°; 3. Gear teeth Bar mechanism: the variable pitch actuator of this mechanism is relatively simple, but its driving device (such as a hydraulic cylinder) is not easy to install. This mechanism is only suitable for low-power ocean current energy generator sets. When the power of the set is large, this Too much load on the pitch bearings in the mechanism unit

4. Worm gear mechanism: Due to the self-locking characteristics of the worm gear and worm, it can prevent the feathering of the blade under the action of water flow, and no additional limit is required, but the transmission efficiency of the worm gear and worm mechanism is low and the heat generation is large

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