A kind of self-assembled direct-connected hydroelectric generator set

Abstract

A complete and directly connected hydroelectric generator set comprises a water turbine and a generator, wherein the two sides of a volute water inlet chamber of the water turbine are respectively connected to a front cover plate and a water outlet chamber, a runner is arranged in the volute water inlet chamber, the runner is fixed to one end of a main shaft by a key and is compressed by a locking nut, the other end of the main shaft passes through a central outlet of the front cover plate and is connected to the generator, and a uniformly distributed movable guide vane is arranged in the volute water inlet chamber located at the inlet of the runner, one end of the movable guide vane is embedded in the front cover plate, and the other end passes through a side wall of the water outlet chamber and is connected to a guide vane speed regulating mechanism, and the guide vane speed regulating mechanism is arranged outside the water outlet chamber, which effectively shortens the cantilever section length required for the main shaft to connect to the runner, improves the bearing force, and is beneficial to the stable operation of the unit. The invention has a novel and unique structure, is easy to operate, and has a low cost, meets the requirements for recovering surplus energy of a water system, has a short main shaft cantilever section, a compact structure, stable and reliable operation, and remarkable social and economic benefits.

Description

Technical Field

[0001] The invention relates to a hydroelectric generator set in the field of energy saving and surplus energy recovery, in particular to a fully assembled direct-connected hydroelectric generator set. Background Art

[0002] In industrial circulating water systems, urban heating systems and other pipelines, valve throttling is commonly used to adjust the balance of the pipeline network. Valve throttling wastes the excess pressure energy. In order to respond to the national call and help achieve energy conservation, emission reduction and "carbon neutrality" goals, this part of the wasted excess pressure can be recovered and converted into electricity. Conventional hydropower units can be used for excess pressure recovery, but their application is limited due to shortcomings such as complex system, large size, and difficult installation and maintenance. The guide vane speed regulation system of traditional hydropower generator sets is usually arranged on the generator side, and axial installation space needs to be reserved, resulting in an excessively long main shaft cantilever section and deteriorated bearing stress, which can easily cause vibration, shortened bearing life and other problems. Therefore, there is an urgent need for a complete direct-connected hydropower generator set with both flow regulation and excess pressure recovery functions. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a self-contained direct-connected hydroelectric generator set, which can effectively solve the problems of too long cantilever section of the main shaft, deterioration of bearing stress, easy to cause vibration, shortened bearing life, etc., and has the functions of flow regulation and residual pressure recovery.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is a self-assembled direct-connected hydroelectric generator set, comprising a turbine and a generator, wherein the two sides of the volute water diversion chamber of the turbine are respectively connected to the front cover plate and the water outlet chamber, a runner is installed in the volute water diversion chamber, the runner is fixed to one end of the main shaft by a key and is tightened by a locking nut, the other end of the main shaft passes through the center outlet of the front cover plate and is connected to the generator, and the volute water diversion chamber located at the inlet of the runner is equipped with evenly distributed movable guide vanes, one end of the movable guide vanes is embedded in the front cover plate, and the other end passes through the side wall of the water outlet chamber and is connected to the guide vane speed regulating mechanism, and the guide vane speed regulating device is installed outside the water outlet chamber, which effectively shortens the cantilever section length required for the main shaft to connect the runner, improves the bearing force, and is conducive to the stable operation of the unit.

[0005] The invention has novel and unique structure, convenient operation, low cost, meets the requirements of water system surplus energy recovery, has short main shaft cantilever section, compact structure, stable and reliable operation, and remarkable social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is the front view of the structure of the present invention.

[0007] Figure 2 It is a three-dimensional structural diagram of the volute water inlet chamber of the present invention.

[0008] Figure 3It is a cross-sectional profile diagram of the volute water inlet chamber of the present invention.

[0009] Figure 4 It is the guide vane connection diagram of the present invention. DETAILED DESCRIPTION

[0010] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings and specific circumstances.

[0011] In conjunction with the accompanying drawings, a complete set of direct-connected hydroelectric generating sets is provided, including a turbine and a generator. The two sides of the volute water inlet chamber 1 of the turbine are respectively connected to the front cover plate 4 and the water outlet chamber 5. The volute water inlet chamber 1 is equipped with a runner 3, and the runner 3 is fixed to one end of the main shaft 6 by a key 7 and is tightened by a locking nut 10. The other end of the main shaft 6 passes through the central outlet of the front cover plate 4 and is connected to the generator 8. The volute water inlet chamber 1 at the inlet of the runner 3 is equipped with uniformly distributed movable guide vanes 2, one end of the movable guide vanes 2 is embedded in the front cover plate 4, and the other end passes through the side wall of the water outlet chamber 5 and is connected to the guide vane speed regulating mechanism 9. The guide vane speed regulating device 9 is installed on the outside of the water outlet chamber 5, which effectively shortens the cantilever section length required for the main shaft 6 to connect the runner 3, improves the bearing force, and is conducive to the stable operation of the unit.

[0012] To ensure better implementation effects, the cross-sectional profile of the volute water inlet chamber 1 is an asymmetric profile, with the side close to the water outlet chamber 5 being a straight line and the side close to the generator 8 being an arc. The guide vane speed regulating mechanism 9 is arranged on one side of the water outlet chamber 5 without interference, and no fixed guide vanes are provided at the water outlet of the volute water inlet chamber 1, thereby reducing the radial dimension of the volute 1.

[0013] The generator 8 is an asynchronous generator or a synchronous generator. A radial bearing and a thrust bearing are arranged inside the generator 8 to bear the radial force and axial force of the unit. No bearing support component is separately arranged outside.

[0014] The runner 3 is a mixed flow runner, an axial flow runner, a reversible runner or a counter-rotating pump runner.

[0015] A mechanical seal 11 is installed in the central outlet of the front cover plate 4 .

[0016] The guide vane speed regulating mechanism 9 includes a crank arm 9-1, a linkage ring 9-2 and a transmission rod 9-3. The movable guide vane 2 is connected to the crank arm 9-1. The crank arm 9-1 is evenly mounted on the linkage ring 9-2. The linkage ring 9-2 is connected to a separately arranged actuator (known technology) through the transmission rod 9-3.

[0017] The rotating wheel 3 is composed of an upper crown 3-1, a lower ring 3-2 and blades 3-3 evenly distributed between the upper crown 3-1 and the lower ring 3-2.

[0018] When the present invention is working, water flows in from the water inlet of the volute water inlet chamber 1, flows through the volute water inlet chamber 1, and flows out through the water outlet of the movable guide vane 2 into the water outlet chamber 5. The guide vane speed regulating mechanism 9 is used to adjust the opening and closing degree of the movable guide vane 2. The guide vane speed regulating mechanism 9 is installed on the side of the water outlet chamber 5, which minimizes the cantilever section length required for the main shaft 6 to connect the runner 3, improves the bearing force, and is conducive to the stable operation of the unit.

[0019] The invention has a simple structure and a scientific and reasonable design. After actual use, the effect is very good. The relevant experimental data are as follows:

[0020] A self-contained direct-connected hydroelectric generator set is used for residual energy recovery in industrial circulating water systems. The ultrasonic flow meter is used to measure the flow rate in a DN250mm pipeline of about 500m 3 / h. Before the transformation, the butterfly valve in the pipeline was opened at about 25%, and the pressure difference was about 0.12MPa. A bypass was opened at the valve to connect a complete set of direct-connected hydroelectric generator sets in parallel. The foundation area was about 1m 2 After the transformation, the butterfly valve is fully closed, water flows into the turbine through the bypass pipe and drives the three-phase asynchronous generator to rotate and do work. The opening of the movable guide vane is manually set to ensure that the pressure difference between the front and rear is 0.12MPa and 500m 3 / h flow rate remains unchanged, the generator produces about 11kW of electricity, the unit runs stably, vibration is small, and the flow rate is adjustable.

[0021] The invention has a novel and unique structure and is easy to operate. Compared with the prior art, it has the following advantages:

[0022] (1) The present invention is a self-contained direct-connected hydroelectric generator set, in which the turbine and the generator are directly connected. The set can effectively realize the recovery of water system surplus energy for power generation, overcome the shortcomings of conventional hydroelectric generator sets, and has the advantages of compact structure, convenient installation, small vibration, stable operation, etc. It is the best choice for the recovery of water system surplus energy;

[0023] (2) The present invention is a self-contained direct-connected hydroelectric generator set, which arranges the movable guide vane speed regulating mechanism on the tailwater side to maximize the compression of the main shaft cantilever section length, improve the bearing stress conditions, reduce the unit vibration, and facilitate the long-term stable operation of the unit;

[0024] (3) The present invention provides a self-contained direct-connected hydroelectric generator set, which can greatly reduce the radial size of the unit by using an asymmetric volute water diversion chamber and not setting fixed guide vanes at the water outlet;

[0025] (4) The present invention is used to carry out energy-saving projects for recycling excess pressure in circulating water systems, recovering the wasted energy and converting it into electrical energy, thereby achieving the goal of energy conservation and environmental protection. The present invention can form a series of products, which are easy to promote and use. It is an innovation in generator sets and has significant social and economic benefits.

Claims

1. A self-assembled direct-connected hydroelectric generator set, comprising a water turbine and a generator, wherein the two sides of the volute water inlet chamber (1) of the water turbine are respectively connected to the front cover plate (4) and the water outlet chamber (5), and a runner (3) is installed in the volute water inlet chamber (1), characterized in that: The impeller (3) is fixed to one end of the main shaft (6) by a key (7) and is tightened by a locking nut (10). The other end of the main shaft (6) passes through the central outlet of the front cover (4) and is connected to the generator (8). The volute water inlet chamber (1) located at the inlet of the impeller (3) is equipped with uniformly distributed movable guide vanes (2). One end of the movable guide vanes (2) is embedded in the front cover (4), and the other end passes through the side wall of the water outlet chamber (5) and is connected to the guide vane speed regulating mechanism (9). The guide vane speed regulating mechanism (9) is installed on the outside of the water outlet chamber (5); The cross-sectional profile of the volute water inlet chamber (1) is an asymmetric profile, with the side close to the water outlet chamber (5) being a straight line and the side close to the generator (8) being an arc, and the guide vane speed regulating mechanism (9) being arranged on the side of the water outlet chamber (5) without being interfered with; The generator (8) is an asynchronous generator or a synchronous generator, and a radial bearing and a thrust bearing are provided inside the generator (8) for bearing the radial force and axial force of the unit; The guide vane speed regulating mechanism (9) comprises a crank arm (9-1), a linkage ring (9-2) and a transmission rod (9-3); the movable guide vane (2) is connected to the crank arm (9-1); the crank arm (9-1) is evenly mounted on the linkage ring (9-2); and the linkage ring (9-2) is connected to a separately provided actuator via the transmission rod (9-3).

2. The self-contained direct-connected hydroelectric generating set according to claim 1, characterized in that: The impeller (3) is a mixed flow impeller, an axial flow impeller, a reversible impeller or a counter-rotating pump impeller.

3. The self-contained direct-connected hydroelectric generating set according to claim 1, characterized in that: A mechanical seal (11) is installed in the central outlet of the front cover plate (4).

4. The self-contained direct-connected hydroelectric generating set according to claim 1, characterized in that: The rotating wheel (3) is composed of an upper crown (3-1), a lower ring (3-2), and blades (3-3) evenly distributed between the upper crown (3-1) and the lower ring (3-2).

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