Pipeline straight connecting shaft extension type micro-hydroelectric power generation equipment

Abstract

The invention provides pipeline direct connection shaft extension type micro hydroelectric power generation equipment which comprises a shell, a power generator, an impeller and a flow channel, the flow channel is communicated with a pipeline of a water supply pipe network, the impeller is located in the flow channel, and water flow impacts the impeller through the flow channel to enable the power generator to generate power; the flow channel is of a reducing structure with the middle thin and the two ends thick, the flow channel comprises a front flow guide pipe, a middle pipe and a rear flow guide pipe through which water flows in sequence, the diameter of the middle pipe is smaller than that of the front flow guide pipe and that of the rear flow guide pipe, and the impeller is located in the middle pipe. The flow channel is of a reducing structure, and when water flow passes through the middle pipe, the flow speed is increased to enable the impeller to rotate. The diameter of the rear flow guide pipe is increased relative to the middle pipe, and when water flow with the speed increased in the middle pipe flows out of the rear flow guide pipe, the speed is decreased. The reducing structure enables the pressure difference of water flow at the inlet and the outlet of the flow channel to be small, and the low water resistance function of the hydroelectric generator is achieved. The technical problem of energy consumption caused by increase of water resistance due to increase of hydroelectric power generation opportunities in a low-flow-speed and low-water-head urban pipe network is solved.

Description

Technical Field

[0001] This invention relates to the field of pipeline flow and water quality monitoring technology, and more specifically, to a pipeline direct-connection shaft extension type micro-hydropower generation device. Background Technology

[0002] With the continuous promotion and application of smart water management projects in various cities, a large number of various monitoring devices, such as flow meters, pressure gauges, water quality monitors, remote terminal units, and other sensors and remote control devices (referred to as pipeline equipment), need to be installed on the water supply network to monitor the network status and provide real-time data, thereby realizing intelligent supervision and smart scheduling of the pipeline system. Although the power demand of these devices is not large, a stable power supply must be guaranteed; otherwise, monitoring failure or data loss may occur, causing errors in intelligent supervision and smart scheduling of the pipeline network. Currently, the commonly used solutions are grid connection or wind-solar hybrid (wind power generation and solar power generation) to meet the power demand of water supply network monitoring and remote control equipment. Grid connection is costly, involves large-scale power line construction, involves multiple management departments, and is inconvenient to manage. Although wind and solar energy in wind-solar hybrid power generation systems are both green energy sources, their efficiency is affected by the environment, and there are also limitations on installation location. Green belts, shady areas, and other locations are not suitable for installation, and installation requires approval from relevant departments.

[0003] Application number CN201922408092.8, entitled "A Real-time Pressure Remote Transmission System for Urban Water Supply Networks," proposes installing a hydroelectric generator in the water supply network to generate electricity using the potential energy of the water flow to power network equipment. Another example is application number CN201510318536.2, entitled "A Pipeline Hydroelectric Power Generation System," which also proposes installing a hydroelectric generator in the water supply network for lighting to save electricity costs. Hydroelectric power generation is less affected by environmental factors than wind and solar power generation. However, both patents only mention using the potential energy of the water flow in the water supply network to generate electricity, without considering the actual operating conditions of the network. Water in water supply networks is characterized by low flow velocity and low head. Water supply is powered, typically by pumping. In a water supply network, the greater the resistance, the greater the energy consumption. Installing generators on the network increases resistance to the water flow; if the increased energy consumption due to high water resistance from the generator results in a net loss, it would be counterproductive. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the problem that adding a hydroelectric generator to the existing water supply network will increase water resistance and thus increase energy consumption. The present invention provides a low water resistance, direct-connection shaft extension type micro hydroelectric generator suitable for low flow velocity and low head conditions in water supply networks.

[0005] A direct-connection shaft-extended micro-hydropower generation device includes a casing, a generator, and an impeller. The casing has a flow channel that is connected to a water supply network. The impeller is located in the flow channel, and water flows through the flow channel to impact the impeller, causing the generator to generate electricity. The flow channel has a narrowed diameter structure, with the middle section being narrower than the two ends. The flow channel includes a front guide pipe, a middle pipe, and a rear guide pipe through which the water flows in sequence. The diameter of the middle pipe is smaller than the diameters of the front and rear guide pipes. The impeller is located in the middle pipe.

[0006] This invention employs a narrow-diameter flow channel structure. When water flows through the smaller diameter section of this narrow-diameter structure (the middle pipe), the flow velocity increases, impacting the impeller and causing it to rotate. Furthermore, the diameter of the outlet (the rear guide pipe) is relatively larger than the middle pipe, causing the increased velocity of the water in the middle pipe to decrease as it exits the rear guide pipe. This large-small-large narrow-diameter flow channel structure minimizes the pressure difference between the inlet and outlet (i.e., low water resistance), achieving the low water resistance function of a hydroelectric generator. This solves the problem of increased water resistance and energy consumption caused by installing hydroelectric generators in water supply networks. This invention can replace wind and solar power generation, and the generated electricity can meet the power requirements of the equipment.

[0007] Furthermore, the front and rear guide tubes are frustoconical in shape, and the middle tube is cylindrical; the thinner ends of the front and rear guide tubes are respectively connected to the two ends of the middle tube.

[0008] Furthermore, the impeller is installed in the intermediate tube by a support structure, which includes a front support, a rear support, and a rotating shaft. The front support and the rear support are fixed in the intermediate tube, and the rotating shaft is located between the front support and the rear support. The impeller is fixed to the rotating shaft.

[0009] Furthermore, the rotating shaft is rotatably connected to the front and rear supports via bearings. The bearing between the front support and the rotating shaft is a self-lubricating bearing, while the bearing between the rear support and the rotating shaft is a radial-thrust integrated water-lubricated bearing. Neither the radial-thrust integrated water-lubricated bearing nor the self-lubricating bearing requires lubricating oil. Since the pipe-connected shaft-extended micro-hydropower generation device of this invention is used in water supply networks, and the water in the pipeline is for drinking, zero pollution must be ensured. Ordinary steel bearings rely on lubricating oil, which inevitably leads to leakage and contamination of the water in the water supply network. Both the radial-thrust integrated water-lubricated bearing and the self-lubricating bearing are lubricated by water, resulting in zero pollution. The bearing at the front support only needs to withstand radial force, while the self-lubricating bearing can only withstand radial force. Because water drives the impeller to rotate while also exerting axial thrust, the bearing at the rear support will simultaneously withstand both radial and axial forces. The radial-thrust integrated water-lubricated bearing can withstand both radial and axial forces simultaneously.

[0010] Furthermore, both the front support and the rear support are hub structures, and the center of both the front support and the rear support has a hole that matches the end of the rotating shaft.

[0011] Furthermore, the front support is provided with a hemispherical guide head facing the water inlet to guide the water flow into the intermediate pipe.

[0012] Furthermore, the generator is mounted on the outer surface of the housing, and the power of the rotating shaft is transmitted to the generator via a transmission component; the transmission component is connected to the rotating shaft, and the water flow impacts the impeller to rotate, causing the rotating shaft to rotate, and the transmission component transmits the power to the generator.

[0013] Furthermore, the housing includes a front guide pipe housing, a generator housing, and a rear guide pipe housing that are fixedly connected in sequence. The front guide pipe is opened in the front guide pipe housing; the intermediate pipe is opened in the generator housing; the rear guide pipe extends through the generator housing into the rear guide pipe housing; and the generator is mounted on the outer surface of the generator housing.

[0014] Furthermore, the transmission component includes a primary transmission component and a secondary transmission component; the primary transmission component includes gear one, gear two, and an extension shaft, gear one is fixed to one end of the rotating shaft, gear two is fixed to one end of the extension shaft, and gear one and gear two mesh perpendicularly; the secondary transmission component includes synchronous pulley one, synchronous pulley two, and a synchronous belt, synchronous pulley one is fixed to the other end of the extension shaft, and synchronous pulley two is fixed to the input shaft of the generator; the power generated by the rotation of the impeller is transmitted to the input shaft of the generator via the rotating shaft, gear one, gear two, extension shaft, synchronous pulley one, synchronous belt, and synchronous pulley two.

[0015] The gear one and gear two mesh perpendicularly, making the extension shaft perpendicular to the rotation center line of the rotating shaft, thus transmitting the rotational power of the impeller from inside the housing to outside the housing.

[0016] Furthermore, it also includes a protective cover, which is fixed to the outer surface of the generator housing, and the generator and the secondary transmission components are located within the protective cover.

[0017] Furthermore, the extension shaft passes through the generator housing and is connected to the secondary transmission component; a rotary sealing ring is provided between the extension shaft and the generator housing for waterproof sealing to prevent water in the flow channel from overflowing the housing.

[0018] Furthermore, it also includes an overflow channel that extends through the housing along the flow direction, and a one-way check valve is provided in the overflow channel.

[0019] When the flow rate in the flow channel exceeds the design value, the water pressure in the flow channel overcomes the elasticity of the one-way check valve, and the water flows away from the overflow channel through the one-way check valve. Since this part of the flow does not pass through the flow channel, it will not do work on the impeller, thus ensuring that the impeller speed is controlled within the design range and outputs stable power.

[0020] Furthermore, the number of blades is 5-10, and the rotational speed of the impeller is 400-700 r / min.

[0021] The present invention has the following beneficial effects: The pipe-connected shaft extension type micro-hydropower generation device of the present invention has a narrowed diameter structure in the flow channel, which increases the speed of the low-velocity water flow to drive the impeller to rotate and generate electricity. Furthermore, the diameter of the water outlet (rear guide pipe) is relatively larger than that of the middle pipe, and the speed of the water flow that increases in speed in the middle pipe slows down when it comes out of the rear guide pipe. This hydroelectric generator enables the system to generate electricity in urban water supply networks with low head and low flow velocity, meeting equipment requirements without significantly increasing water resistance and thus reducing network operating costs. The generator is externally mounted on the outer surface of the casing for easy maintenance. The bearings at both ends of the rotating shaft are located within the flow channel and are integrated radial-thrust water-lubricated bearings, causing no water pollution. The flow channel serves as the main channel, and an overflow channel is also provided within the casing. When the water flow rate from the inlet exceeds the design value, the overflow channel diverts a portion of the flow, keeping the impeller speed within the design range and ensuring stable power output, thereby guaranteeing a stable power supply to the network equipment. This shaft-extended micro-hydroelectric generator can be directly installed without additional civil engineering, and can be conveniently installed on both old and new pipelines without occupying extra space. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A direct-connection shaft-extended micro-hydraulic power generation device (main sectional view). Figure 2 A direct-connection shaft-extended micro-hydraulic power generation device (left sectional view). Figure 3 This is a diagram showing the fit between the rotating shaft and the extension shaft; Figure 4 This is a diagram of the front support structure; Figure 5 This is a diagram of the rear support structure.

[0023] The serial numbers are as follows: 1-Impeller, 2-Generator, 3a-Front guide pipe housing, 3b-Generator housing, 3c-Rear guide pipe housing, 4-Front guide pipe, 5-Intermediate pipe, 6-Rear guide pipe, 7-Front support, 8-Rear support, 9-Rotating shaft, 10-Guide head, 11-First stage transmission component, 11a-Gear 1, 11b-Gear 2, 11c-Extension shaft, 12-Synchronous belt assembly, 13-Protective cover, 14-Rotary seal ring, 15-Overflow channel, 16-One-way check valve, 17-Radial thrust integrated water-lubricated bearing, 18-Self-lubricating bearing, 19-Bearing, 20-Bearing cover. Detailed Implementation

[0024] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0025] Example 1 A type of direct-connected shaft-extended micro-hydropower generation device, such as... Figure 1 and Figure 2 As shown, the device includes a casing, an impeller 1, and a generator 2. A flow channel is formed within the casing, with both ends connected to pipes in a water supply network. The impeller 1 is located within the flow channel, and water flows through the channel, impacting the impeller 1 to generate electricity using the generator 2. The flow channel has a narrower diameter structure, wider at both ends and narrower in the middle. The flow channel includes a front guide pipe 4, a middle pipe 5, and a rear guide pipe 6 through which water flows sequentially. The diameter of the middle pipe 5 is smaller than the diameters of the front guide pipe 4 and the rear guide pipe 6. The impeller 1 is located within the middle pipe 5. Figure 1 As shown, the front guide tube 4 and the rear guide tube 6 are frustoconical, and the middle tube 5 is cylindrical; the thinner ends of the front guide tube 4 and the rear guide tube 6 are respectively connected to the two ends of the middle tube 5. Figure 1 As shown, the rear guide pipe 6 is longer than the front guide pipe 4 so that the water flow coming out of the middle pipe 5 is slowed down.

[0026] like Figure 1 As shown, the impeller 1 is installed in the intermediate tube 5 via a support structure, which includes a front support 7, a rear support 8, and a rotating shaft 9. The front support 7 and the rear support 8 are fixed in the intermediate tube 5, and the rotating shaft 9 is rotatably supported between the front support 7 and the rear support 8. The impeller 1 is fixed to the rotating shaft 9. The transmission component is connected to the rotating shaft 9. The water flow impacts the impeller 1, causing it to rotate and the rotating shaft 9 to rotate. The transmission component transmits the power to the generator 2. The generator 2 is installed on the outer surface of the casing. The power generated by the impeller 1 is transmitted to the generator 2 through the transmission component.

[0027] Both the front support 7 and the rear support 8 are hub structures, with holes at their centers to fit the end of the rotating shaft 9. The rotating shaft 9 is rotatably connected to the front support 7 and the rear support 8 via bearings. The bearing between the front support 7 and the rotating shaft 9 is a self-lubricating bearing 18, and the bearing between the rear support 8 and the rotating shaft 9 is a radial-thrust integrated water-lubricated bearing 17. Since the bearings are radial-thrust integrated water-lubricated bearings 17 and 18, no lubricating oil is required. This is because the direct-drive micro-hydropower generation equipment is used in a water supply network, and the water in the pipeline is for drinking purposes, requiring zero pollution. Ordinary steel bearings rely on lubricating oil, which inevitably leads to leakage and contamination of the water in the supply network. The radial-thrust integrated water-lubricated bearings 17 and 18 are lubricated by water, resulting in zero pollution.

[0028] like Figure 4 and Figure 5 As shown, the structures of the front support 7 and the rear support 8 are different. The front support 7 is provided with a hemispherical guide head 10 facing the water inlet to guide the water flow into the intermediate pipe 5.

[0029] like Figure 1 As shown, the transmission component includes a primary transmission component 11 and a secondary transmission component; as Figure 2 As shown, the primary transmission component 11 includes gear 11a, gear 11b, and extension shaft 11c. Gear 11a is fixed to one end of the rotating shaft 9, and gear 11b is fixed to one end of the extension shaft 11c. Gear 11a and gear 11b mesh perpendicularly. The secondary transmission component is a synchronous belt assembly 12, including synchronous pulley 1, synchronous pulley 2, and a synchronous belt. Synchronous pulley 1 is fixed to the other end of the extension shaft 11c, and synchronous pulley 2 is fixed to the input shaft of the generator 2. The power generated by the rotation of the impeller 1 is transmitted to the input shaft of the generator 2 via the rotating shaft 9, gear 11a, gear 11b, extension shaft 11c, synchronous pulley 1, synchronous belt, and synchronous pulley 2. The tooth ratio of synchronous pulley 1 to synchronous pulley 2 is greater than 1 to achieve the purpose of speed increase. In this embodiment, the tooth ratio of synchronous pulley 1 to synchronous pulley 2 is 3:1, which increases the speed transmitted from the impeller 1 by three times.

[0030] like Figure 3 As shown, gear 11a and gear 11b mesh perpendicularly, making the extension shaft 11c perpendicular to the rotation center line of the rotating shaft 9, thus transmitting the rotational power of the impeller 1 from inside the housing to outside the housing.

[0031] The protective cover 13 is fixed to the outer surface of the housing. The direct-connect shaft extension micro-hydropower generation equipment is installed on the water supply network. The generator 2 is located outside the housing. In order to protect the generator 2 and the synchronous belt, a protective cover 13 is also provided. The generator 2 and the secondary transmission components are located in the protective cover 13.

[0032] The extension shaft 11c passes through the housing and is connected to the secondary transmission component; a rotary sealing ring 14 is provided between the extension shaft 11c and the housing to provide a waterproof seal and prevent water in the flow channel from overflowing into the housing.

[0033] Water from the water supply network flows into the front guide pipe 4, and the guide head 10 on the front support 7 guides the water flow. The water flow is accelerated by the intermediate pipe 5, which drives the impeller 1 to rotate. The impeller 1 is connected to the rotating shaft 9 via a keyway. The rotating shaft 9 drives the gear pair to rotate. Gear 11a and gear 21b mesh perpendicularly. Through the reversing function of the gear pair, the extension shaft 11c rotates. The extension shaft 11c is sealed to the housing by a rotating sealing ring 14 to prevent water from overflowing from the flow channel. The extension shaft 11c drives the synchronous belt assembly 12 to generate electricity from the external generator 2. The generator 2 and the synchronous belt assembly 12 are housed in a protective cover 13, which protects the generator 2 and the synchronous belt assembly 12. After the water flows through the impeller 1 and completes its work, it is slowed down by the rear guide pipe 6 and flows into the pipe behind the water supply network. Because the flow channel has a narrowing structure, the flow resistance is reduced when the water flows to the middle pipe 5. At the same time, the diameter of the rear guide pipe 6 increases, forming a pressure-replenishing effect, so as to reduce the pressure difference before and after the flow channel and save the energy consumption of the water flow drive in the pipeline.

[0034] This embodiment of the pipeline direct-connection shaft-extended micro-hydropower generation device, by setting the flow channel with a narrow diameter structure, increases the flow velocity of water flowing through the impeller 1 and slows down the flow velocity when the water flows out of the flow channel. The small pressure difference between the inlet and outlet of the water flow allows the hydropower generation device to generate electricity to meet the equipment's needs in urban water supply networks with low head and low flow velocity without increasing water resistance and thus reducing network operating costs. Furthermore, the structure of the power generation device is improved by mounting the generator 2 and synchronous belt outside the casing, facilitating installation and maintenance; the transmission components are set as gear pairs and synchronous belt assemblies, saving costs; the integrated radial thrust water-lubricated bearing 17 avoids contaminating the water in the pipeline network; and the gear pair is made of environmentally friendly composite material, causing no pollution to the water quality. Compared to wind and solar power generation, hydropower generation is not affected by the external environment and can completely replace wind and solar power generation for standalone use, or it can be used in combination with wind and solar power generation. Installation of this application is unrestricted, convenient, and can be installed in both new and old pipeline networks without the need for civil engineering or additional pipeline modifications.

[0035] In urban water supply networks, the water velocity is typically 0.3-0.7 m / s, and the flow rate is typically 0.009-0.023 m³ / s. 3 The invention also features 5-10 blades and an impeller rotation speed of 400-700 r / min, which can match the operating conditions in water supply networks and exhibits high hydraulic efficiency. Hydraulic efficiency refers to the efficiency of converting fluid energy into mechanical energy.

[0036] The relationship between water flow velocity and the number of blades: For the same power generation, at lower water flow velocities, the number of blades can be appropriately increased to obtain sufficient driving torque and improve the impeller's efficiency in capturing water flow energy. For example, in some stable and slow-flowing pipes, more blades can better utilize the water flow dynamics (the urban water supply network described in this invention is characterized by low flow velocities). However, at higher water flow velocities, an excessive number of blades may increase water flow resistance and impeller rotation resistance. In this case, the number of blades can be reduced; generally, fewer blades are sufficient to fully absorb water flow energy, and impeller wear and hydraulic losses can also be reduced.

[0037] Relationship between flow rate and number of blades: When the power generation is the same, a smaller flow rate requires more blades to obtain greater torque; similarly, a larger flow rate requires fewer blades to reduce torque.

[0038] The relationship between head height and the number of blades: Head refers to the drop in water flow. A lower head requires more blades to capture the water's energy, thus improving power generation efficiency (the urban water supply network described in this invention is characterized by a low head). A higher head results in greater water flow impact force and greater stress on the impeller, allowing for a reduction in the number of blades. Impeller speed: The flow rate and head height determine the impeller speed. The impeller speed is matched with the generator, and at the rated speed, it corresponds to the rated output power of the generator.

[0039] This application comprehensively considers the characteristics of water flow velocity, flow rate, and head height in urban water supply networks. By designing 5-10 blades and an impeller speed of 400-700 r / min, the pipeline direct-connection shaft-extended micro-hydropower generation device described in this application achieves high hydraulic efficiency, ensuring power supply to the network equipment. Those skilled in the art know that power generation efficiency is directly proportional to hydraulic efficiency; higher hydraulic efficiency equates to higher power generation efficiency.

[0040] Table 1

[0041] As shown in Table 1, the number of blades, rotational speed, flow rate, and flow velocity are all known values, while the inlet pressure, outlet pressure, torque, head, shaft power, and hydraulic efficiency are measured values. The water flow sequentially passes through the front guide pipe, the middle pipe, and the rear guide pipe. The inlet pressure refers to the pressure at the inlet of the reduced-diameter structure described in this application, the outlet pressure refers to the pressure at the outlet of the reduced-diameter structure described in this application, the torque refers to the impeller torque, and the shaft power refers to the rotating shaft power. As can be seen from the table above: 1. When the number of blades is 3, 4, 10, 12, 13, and 14, and the rotational speed is 500 r / min, the hydraulic efficiency is below 50%; when the number of blades is 5-10, the hydraulic efficiency is higher; 2. For the same number of blades (e.g., 10 blades), the lower the rotational speed, the lower the hydraulic efficiency; the hydraulic efficiency is higher at rotational speeds of 500, 600, 700, and 1000 r / min; however, the hydraulic efficiency is even lower at 1000 r / min. This indicates that, with the same number of blades, a higher rotational speed does not necessarily mean higher hydraulic efficiency. The rotational speed in this application is 400-700 r / min. Before designing the impeller, those skilled in the art derive the impeller rotational speed range (design speed) based on the required output power and material structure design. This is a common design method used by those skilled in the art. The designer derives the design speed by using a formula to reverse-engineer the required output power of the direct-drive shaft-extended micro-hydraulic power generation device described in this application. The formula is: Where: n is the rotational speed (r / min), P is the shaft power (W), and T is the torque (N·m); the shaft power is the output power; the torque is determined within a range by mechanical design and material limitations. This embodiment, combined with the actual working conditions of urban water supply networks and the number of blades and the obtained design rotational speed, obtained through simulation experiments that when the number of blades is 5-10 and the impeller rotational speed is 400-700 r / min, the pipeline direct-connection shaft-extended micro-hydropower generation device described in this application has high hydraulic efficiency and can guarantee the power supply to the network equipment.

[0042] Example 2 The difference between Example 2 and Example 1 is that the housing is divided into three parts, including a front guide pipe housing 3a, a generator housing 3b, and a rear guide pipe housing 3c, which are fixedly connected in sequence. Adjacent housings are connected and fixed by fasteners. The front guide pipe 4 is located in the front guide pipe housing 3a; the intermediate pipe 5 is located in the generator housing 3b; the rear guide pipe 6 extends through the generator housing 3b into the rear guide pipe housing 3c; the generator 2 is mounted on the outer surface of the generator housing 3b, and the extension shaft passes through the generator housing and connects to the synchronous belt assembly. This housing structure facilitates the machining of the flow channel and the installation of the impeller 1, front support 7, rear support 8, rotating shaft 9, and bearings. Figure 1As shown, the extension shaft is fitted with a bearing and an end cap where it passes through the generator housing.

[0043] Example 3 The difference between Embodiment 3 and Embodiments 1 and 2 is that an overflow channel 15 is further provided in the housing, the overflow channel 15 extends through the housing along the flow direction, and a one-way check valve 16 is also provided in the overflow channel 15. Figure 1 As shown, the overflow channel 15 is opened from the inner hole of the front guide pipe housing 3a, and passes through the front guide pipe 4, the intermediate pipe 5 and the rear guide pipe 6 in sequence. When the flow rate in the channel exceeds the design value, the water pressure in the channel overcomes the elastic force of the one-way check valve 16, and the water flows away from the overflow channel 15 through the one-way check valve 16. Since this part of the flow does not pass through the channel, it will not do work on the impeller 1, thus ensuring that the speed of the impeller 1 is controlled within the design range and the output power is stable.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A pipe-connected shaft-extended micro-hydropower generation device, comprising a casing, a generator, and an impeller, wherein a flow channel is formed in the casing and connected to a water supply network, the impeller is located in the flow channel, and water flows through the flow channel to impact the impeller, thereby generating electricity from the generator; characterized in that, The flow channel is a narrow-diameter structure with a narrow middle and wide ends. The flow channel includes a front guide pipe, a middle pipe and a rear guide pipe through which the water flows in sequence. The diameter of the middle pipe is smaller than the diameter of the front guide pipe and the rear guide pipe. The impeller is located in the middle pipe.

2. The pipeline direct-connection shaft extension type micro-hydraulic power generation device according to claim 1, characterized in that, The front and rear guide tubes are frustoconical, and the middle tube is cylindrical; the thinner ends of the front and rear guide tubes are connected to the two ends of the middle tube, respectively.

3. The pipeline direct-connection shaft extension type micro-hydraulic power generation device according to claim 1, characterized in that, The impeller is installed in the intermediate tube by a support structure, which includes a front support, a rear support, and a rotating shaft. The front support and the rear support are fixed in the intermediate tube, and the rotating shaft is located between the front support and the rear support. The impeller is fixed to the rotating shaft.

4. The pipeline direct-connection shaft extension type micro-hydraulic power generation device according to claim 3, characterized in that, The rotating shaft is rotatably connected to the front and rear supports via bearings. The bearing between the front support and the rotating shaft is a self-lubricating bearing, and the bearing between the rear support and the rotating shaft is a radial thrust integrated water-lubricated bearing.

5. The pipeline direct-connection shaft extension type micro-hydraulic power generation device according to claim 3, characterized in that, The generator is mounted on the outer surface of the housing, and the power of the rotating shaft is transmitted to the generator via a transmission component. The transmission component is connected to the rotating shaft, and the water flow impacts the impeller to rotate, causing the rotating shaft to rotate. The transmission component then transmits the power to the generator.

6. The pipeline direct-connection shaft extension type micro-hydraulic power generation device according to claim 5, characterized in that, The housing includes a front guide pipe housing, a generator housing, and a rear guide pipe housing that are fixedly connected in sequence. The front guide pipe is opened in the front guide pipe housing; the intermediate pipe is opened in the generator housing; the rear guide pipe extends through the generator housing into the rear guide pipe housing; and the generator is mounted on the outer surface of the generator housing.

7. The pipeline direct-connection shaft extension type micro-hydropower generation device according to claim 6, characterized in that, The transmission components include a primary transmission component and a secondary transmission component. The primary transmission component includes gear one, gear two, and an extension shaft. Gear one is fixed to one end of the rotating shaft, and gear two is fixed to one end of the extension shaft. Gear one and gear two mesh perpendicularly. The secondary transmission component includes synchronous pulley one, synchronous pulley two, and a synchronous belt. Synchronous pulley one is fixed to the other end of the extension shaft, and synchronous pulley two is fixed to the input shaft of the generator. The power generated by the rotation of the impeller is transmitted to the input shaft of the generator via the rotating shaft, gear one, gear two, extension shaft, synchronous pulley one, synchronous belt, and synchronous pulley two.

8. The pipeline direct-connection shaft extension type micro-hydropower generation device according to claim 7, characterized in that, It also includes a protective cover, which is fixed to the outer surface of the generator housing, and the generator and the secondary transmission components are located inside the protective cover.

9. The pipeline direct-connection shaft extension type micro-hydraulic power generation device according to claim 1, characterized in that, It also includes an overflow channel that extends through the housing along the flow direction, and a one-way check valve is provided in the overflow channel.

10. The pipeline direct-connection shaft extension type micro-hydropower generation device according to claim 1, characterized in that, The number of blades is 5-10, and the impeller rotation speed is 400-700 r / min.

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