Hydroelectric generator

Abstract

The present invention provides a hydroelectric generator, which belongs to the technical field of water flow generators. It solves the problem of low power generation efficiency of existing water flow generators. The hydroelectric generator includes a shell, a rotating shaft, an impeller, a coil and a magnet. The shell has a magnetic cavity and a water flow cavity. The magnetic cavity and the water flow cavity are connected through a water flow channel. The impeller is arranged in the water flow cavity, the magnet is arranged in the magnetic cavity, the two ends of the rotating shaft are respectively connected to the magnet and the impeller, and an isolation member capable of preventing impurities in the water flow cavity from entering the magnetic cavity is arranged at the water flow channel in the shell. The hydroelectric generator has the advantage of high power generation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of water flow generators and relates to a hydroelectric generator. Background Art

[0002] Faucets are products used to control the size of water flow in pipes. They are widely used in various places where water is used. As people's requirements for the use of faucets continue to increase, smart faucets such as induction faucets are gradually attracting people's attention. Existing induction faucets often use external power supplies, such as 220V AC and dry batteries, which have problems such as complicated wiring, high cost, and the risk of leakage.

[0003] For this purpose, people have designed a micro water flow generator system with an induction control end and applied for a Chinese patent (its application number is: 201410388969.0; its publication number is: CN104153934A). The water flow generator in the water flow generator system includes a housing, an impeller and a magnet. The magnet is arranged in the housing, and the impeller is arranged in the turbine housing. The impeller is arranged at the lower part, and the magnet is arranged at the upper part. The two are connected by an axis, and the upper claw pole and the lower claw pole are arranged on both sides of the coaxial magnet. When the water flow generator is used, the water flow in the pipeline impacts the impeller to drive the impeller to rotate. The impeller drives the magnet to rotate circumferentially through the axis to form a rotating magnetic field. The upper claw pole, the lower claw pole and the coil cut the magnetic flux line with the change of the rotating magnetic field, and generate an induced current to provide the use of the power supply element. The upper claw pole and the lower claw pole are made of magnetic conductive material to assist the use of the magnet with a weaker magnetic field to provide sufficient power generation.

[0004] Although the above-mentioned water flow generator can generate electricity by using the water flow in the pipeline, it has the problems of low power generation efficiency and small power generation: in daily life water, the water transported from the pipeline often contains more impurities, including magnetic particles. Although the above-mentioned water flow generator sets the magnet at the top, during use, due to the magnetic attraction of the magnet, the magnetic particles in the water are still easy to enter the outer shell where the magnet is placed and be absorbed by the magnet. After long-term use, it is very easy to cause poor rotation balance of the shaft, rotation jamming or even jamming due to particle accumulation, which seriously affects the power generation efficiency.

[0005] Faced with this technical problem, the conventional technical means that technicians in this field can easily think of is to set a filter with a smaller mesh at the water inlet end of the water flow generator to filter out impurities in the water and prevent particles from entering the water flow generator, thereby avoiding excessive accumulation of particles causing rotation jams or jams, and solving the above technical problems. However, after using this filter with a smaller mesh for a period of time, it is easy for impurities to remain, causing some meshes on the filter to be blocked, thereby affecting the water intake, and it needs to be cleaned regularly, which is inconvenient to use. Summary of the invention

[0006] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a hydroelectric generator. The technical problem to be solved is how to improve the power generation efficiency of the hydroelectric generator.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A hydroelectric generator comprises a shell, a rotating shaft, an impeller, a coil and a magnet. The shell has a magnetic cavity and a water flow cavity, the magnetic cavity and the water flow cavity are connected through a water flow channel, the impeller is arranged in the water flow cavity, the magnet is arranged in the magnetic cavity, the two ends of the rotating shaft are respectively connected to the magnet and the impeller, and is characterized in that an isolation member capable of preventing impurities in the water flow cavity from entering the magnetic cavity is arranged in the shell at the water flow channel.

[0009] When the hydroelectric generator is used, the water inlet and the water outlet of the shell are connected to the corresponding pipelines respectively. After the water flows into the shell, it impacts the impeller located in the water passage chamber to make it rotate. The rotating shaft connected to the impeller drives the magnet located in the magnetic chamber to rotate, thereby forming a rotating magnetic field. The coil outside the shell cuts the magnetic flux lines to generate an induced current to complete power generation. In this power generation process, an isolation piece is set in the water passage between the magnetic chamber and the water passage chamber of the hydroelectric generator to prevent impurities in the water passage chamber from entering the magnetic chamber, that is, the water flow is not filtered at the source, ensuring that the water flow can completely enter the water passage chamber to impact the impeller, thereby ensuring that the efficiency of the impeller rotation is not affected. At the same time, the isolation piece is set at the water passage to block the magnetic particles from entering the magnetic chamber to affect the rotation of the magnet, and can also minimize the magnetic attraction of the magnet to the magnetic particles. Therefore, the setting of the above isolation piece not only does not affect the flow of the water flow, but also prevents the magnetic particles from being adsorbed by the magnet and affecting the rotation efficiency, thereby improving the power generation efficiency of the hydroelectric generator.

[0010] In the above-mentioned hydroelectric generator, the isolating member is annular and is sleeved on the outside of the rotating shaft. A seal is formed between the outside and / or end face of the isolating member and the inner wall of the housing. The inner side of the isolating member has an annular abutting surface and the abutting surface abuts against the outer side surface of the above-mentioned rotating shaft. The water passage is sealed by connecting the outer side and end face of the annular isolating member with the fixed inner wall of the housing. The isolating member and the rotating shaft are abutted only by the annular abutting surface. After abutting, the isolating member can block impurities without completely preventing water from passing through the water passage into the magnetic cavity.

[0011] Here, the scheme of using an isolating member to block impurities while allowing water to flow through plays the following roles: 1. If the isolating member is used to prevent water from entering the magnetic cavity, it is necessary to tightly abut the abutting surface of the isolating member against the circumferentially rotating shaft and form a seal between the two. Since one of the two is moving and the other is static, relative movement will occur. If a seal is achieved between the two, not only will the wear of the isolating member be aggravated, the service life will be shortened, and greater resistance will be caused to the circumferential rotation of the shaft. Allowing water to flow through can cause the isolating member to only abut against the shaft, reducing the wear between the two and also reducing the resistance of the isolating member to the circumferential rotation of the shaft. force, thereby improving the efficiency of hydroelectric power generation; 2. If no water enters the magnetic cavity, the isolation element will continue to be subjected to the large water pressure in the water chamber, which requires a large pressure resistance of the isolation element. Moreover, after long-term use, the isolation element is easily affected by the water pressure and deformed, which affects the water blocking and impurity blocking effects. Conversely, if water enters the magnetic cavity, the water pressure in the magnetic cavity and the water chamber on both sides of the isolation element can be kept roughly balanced, thereby avoiding the situation where the isolation element is unilaterally subjected to the water pressure in the water chamber, the isolation element is deformed and cannot block impurities, thereby ensuring the efficiency of impurity blocking and improving the power generation efficiency of the generator.

[0012] In the above-mentioned hydroelectric generator, the isolation member includes an isolation ring 1 and an isolation ring 2, both of which are annular. The isolation ring 1 and the isolation ring 2 are adjacent to each other and are both sleeved on the outside of the above-mentioned rotating shaft. The inner side of the isolation ring 1 has an annular isolation portion 1, and the thickness of the isolation portion 1 along the axial direction gradually decreases from the outside to the inside and the inner side of the isolation portion 1 abuts against the outer side surface of the above-mentioned rotating shaft. The inner side of the isolation ring 2 has an annular isolation portion 2, and the thickness of the isolation portion 2 along the axial direction gradually decreases from the outside to the inside and the inner side of the isolation portion 2 abuts against the outer side surface of the above-mentioned rotating shaft, and a compensation cavity is formed between the isolation portion 1 and the isolation portion 2. The reduction in thickness of the isolation part 1 and the isolation part 2 can reduce the contact area between the isolation part 1 and the rotating shaft, reduce friction, ensure the rotation efficiency of the rotating shaft and thus improve the power generation efficiency. At the same time, the setting of the compensation cavity can cause the isolation part 1 and the isolation part 2 to deform inwardly under the action of water pressure in the magnetic cavity or the water cavity after they are worn, so that the isolation part 1 and the isolation part 2 are close to the rotating shaft, achieving compensation after wear, ensuring the isolation of impurities in the water, ensuring the stable operation of the generator, and improving the power generation efficiency of the generator.

[0013] As another case, in the above-mentioned hydroelectric generator, the isolation member includes an isolation net 1 and an isolation net 2, both of which are ring-shaped. The isolation net 1 and the isolation net 2 are arranged adjacent to each other and are both sleeved on the outside of the above-mentioned rotating shaft. The meshes of the isolation net 1 and the isolation net 2 are arranged in an interlaced manner. By arranging a multi-layer filter net, impurities are filtered to the greatest extent, particles are prevented from entering the magnetic cavity, and the particles are blocked, thereby improving the power generation efficiency of the generator.

[0014] In the above-mentioned hydroelectric generator, a sealing sleeve is also provided in the magnetic cavity, the above-mentioned magnet is a strong magnet and is sealed in the sealing sleeve, and the sealing sleeve and the magnet are fixed to the above-mentioned rotating shaft. In the prior art, upper claw poles and lower claw poles are used to assist the magnet in generating electricity, and the upper claw poles and lower claw poles are both made of magnetic conductive materials. In the process of generating electricity, the magnet rotates while the upper claw poles and lower claw poles do not rotate. In the process of rotating the magnet, due to the effect of the magnetic attraction between the magnet and the upper claw poles and the lower claw poles, the magnet is always subject to resistance, just as the blades of some fans will swing back and forth and stop at a specific position when they stop working. The rotation of the magnet is always affected by magnetic resistance, which greatly reduces the rotation efficiency and power generation efficiency. However, in the magnetic cavity of the hydroelectric generator, only a strong magnet as a magnet is provided, and no claw pole is provided. Not only is the structure simple, but also the situation that the claw pole setting hinders the rotation of the magnet is avoided, thereby improving the efficiency of power generation.

[0015] Since strong magnets will be corroded when meeting water, and the large magnetic force can easily absorb impurities, technical personnel in this field often do not use strong magnets as magnets for power generation in hydroelectric generators. However, in this hydroelectric generator, a sealing sleeve is wrapped around the outside of the magnet to separate the magnet from the water entering the magnetic cavity, thereby protecting the strong magnet. Combined with the technical solution of the above-mentioned isolation member, it not only enhances the magnetic field and improves the power generation efficiency, but also avoids the adsorption of impurities, thereby ensuring the stability of power generation.

[0016] In the above-mentioned hydroelectric generator, a ring-shaped dynamic balance ring is also sleeved on the outer side of the rotating shaft, and the dynamic balance ring is fixed to the above-mentioned sealing sleeve. Since the rotating shaft, magnet and other circumferentially rotating structures may have uneven mass distribution or position deviation during the production and processing process, the dynamic balance ring fixed on the outer side of the rotating shaft can be used to adjust the dynamic balance of the entire generator after assembly, ensure the stability of the rotating shaft, and thus improve the power generation efficiency of the generator.

[0017] In the above-mentioned hydroelectric generator, the coil is cylindrical and is sleeved outside the above-mentioned magnet, and the outer side of the coil is also sleeved with a cylindrical steel ring made of magnetic conductive material. The steel ring is used to shield the magnetic field, so as to prevent the magnet in the generator from being affected by the suction force of other products or components outside the generator and causing slow rotation, thereby improving the power generation efficiency of the generator.

[0018] In the above-mentioned hydroelectric generator, the steel ring includes several annular steel rings, which are coaxially arranged and stacked in sequence to form the above-mentioned steel ring. The steel ring is formed by stacking several annular steel rings, so that when the magnet rotates circumferentially, the magnetic attraction force at each angle is the same, avoiding the situation where the magnetic attraction force changes due to the existence of connection gaps, etc., reducing magnetic resistance, making the rotation of the shaft and the magnet smoother, and ensuring the power generation efficiency.

[0019] In the above-mentioned hydroelectric generator, the magnet is cylindrical and has an N pole and an S pole with the plane where the axis of the magnet is located as a symmetric plane. The coil is wound along the axial direction of the above-mentioned magnet and has a cutting section 1 opposite to the N pole and a cutting section 2 opposite to the S pole. The cutting section 1 and the cutting section 2 are connected by a connecting section. The coil is wound in a square frame shape in the plane where the axis of the magnet is located, and the cutting section 1 and the cutting section 2 are respectively arranged on both sides of the magnet and correspond to the positions of the N pole and the S pole respectively. When the magnet rotates, the cutting section 1 and the cutting section 2 can simultaneously cut the magnetic flux lines and generate induced current, thereby improving the power generation efficiency.

[0020] In the above-mentioned hydroelectric generator, a filter is also connected to the water inlet of the shell. A filter with a larger mesh can be arranged at the water inlet of the generator as required, mainly for filtering larger impurities to prevent the impurities from affecting the rotation of the impeller.

[0021] Compared with the prior art, this hydroelectric generator has the following advantages:

[0022] 1. The hydroelectric generator is provided with an isolation member in the water passage between the water passage chamber and the magnetic chamber to block impurities, which does not affect the flow of water in the water passage chamber that impacts the impeller, and can prevent impurities from being adsorbed on the magnet in the magnetic chamber and hindering the rotation of the magnet, thereby improving the power generation efficiency of the generator.

[0023] 2. Only strong magnets are set in the magnetic cavity without claw poles, which not only simplifies the structure but also avoids the influence of magnetic resistance, improves the rotation efficiency of the shaft and the magnet, and seals the strong magnets through a sealing sleeve to isolate them from water, thus ensuring the service life of the strong magnets.

[0024] 3. A steel ring is set on the outside of the magnet to shield the magnetic field to prevent other structures on the outside of the generator from generating magnetic resistance on the rotation of the magnet. The steel ring composed of annular steel rings can maintain a relatively balanced suction force on the magnet in the circumferential direction, with extremely small magnetic resistance, which can ensure that the magnet rotates smoothly with the shaft and has high power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of this hydroelectric generator.

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the hydroelectric generator.

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of the isolation component in the hydroelectric generator.

[0028] Figure 4 It is a cross-sectional structural schematic diagram of a coil wound around a magnet in the hydroelectric generator.

[0029] In the figure, 1, shell; 1a, water inlet; 1b, water outlet; 1c, magnetic cavity; 1d, water chamber; 1e, water channel; 2, rotating shaft; 3, impeller; 4, magnet; 5, coil; 5a, cutting section one; 5b, cutting section two; 6, isolating piece; 6a, abutting surface; 6b, isolating ring one; 6c, isolating ring two; 6d, isolating part one; 6e, isolating part two; 6f, compensation cavity; 7, sealing sleeve; 8, dynamic balance ring; 9, steel ring; 10, filter screen; 11, shell. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0031] like Figure 1 and Figure 2 As shown, the hydroelectric generator includes a housing 1 having a water inlet 1a and a water outlet 1b, a rotating shaft 2, an impeller 3, a magnet 4 and a coil 5. The housing 1 has a magnetic chamber 1c and a water passage chamber 1d, and the magnetic chamber 1c and the water passage chamber 1d are connected through a water passage 1e. The water passage chamber 1d is connected to both the water inlet 1a and the water outlet 1b, the impeller 3 is arranged in the water passage chamber 1d, the magnet 4 is arranged in the magnetic chamber 1c, the rotating shaft 2 is penetrated in the water passage 1e, and the two ends of the rotating shaft 2 extend into the water passage chamber 1d and the magnetic chamber 1c respectively. The impeller 3 is sleeved and fixed on the outside of one end of the rotating shaft 2, the magnet 4 is cylindrical, sleeved on the outside of the other end of the rotating shaft 2 and tightly matched with the rotating shaft 2, the coil 5 is fixed outside the housing 1, and a filter 10 is also connected to the water inlet 1a of the housing 1.

[0032] Specifically, the housing 1 includes an upper cover and a lower cover which are sealed to each other, the water inlet 1a and the water outlet 1b are both provided on the lower cover, the water passage chamber 1d is located in the lower cover, and the magnetic part is located in the upper cover made of non-metallic material. The upper cover further includes a barrel-shaped sealing cover located on the upper side and a cylindrical support seat located on the lower side, and the water passage 1e is located in the support seat. The rotating shaft 2 is inserted into the support seat and a bearing is provided between the rotating shaft 2 and the support seat, and a bearing is provided between the end of the rotating shaft 2 extending into the magnetic chamber 1c and the sealing cover. The impeller 3 is fixed to the rotating shaft 2 by two retaining springs.

[0033] A cylindrical sealing sleeve 7 is also provided in the magnetic cavity 1c. The sealing sleeve 7 is sleeved on the outside of the rotating shaft 2. One end of the sealing sleeve 7 has a circular sealing portion protruding inward. The sealing portion abuts against and fits tightly against the outside of the rotating shaft 2. The magnet 4 is provided in the sealing sleeve 7. A circular sealing sheet and a dynamic balance ring 8 are provided on the inner side of the other end of the sealing sleeve 7. The sealing sleeve 7 seals the magnet 4 in the sealing sleeve 7 and isolates it from the water in the magnetic cavity 1c through the sealing portion and the sealing sheet. In this embodiment, the magnet 4 is made of strong magnets of neodymium iron boron, and the sealing sleeve 7 can be made of other metals or non-metallic materials except iron.

[0034] The water passage 1e in the support seat is also provided with a circular ring-shaped isolator 6 that can prevent impurities in the water passage chamber 1d from entering the magnetic chamber 1c. In this embodiment, the isolator 6 can be made of wear-resistant material; the isolator 6 is arranged at one end of the bearing facing the water passage chamber 1d, and the isolator 6 is sleeved on the outside of the rotating shaft 2 and the isolator 6 is limited at both ends by the retaining spring and the bearing. Figure 3 As shown, a seal is formed between the outer side of the isolating member 6 and the inner wall of the housing 1 , and the inner side of the isolating member 6 has an annular abutting surface 6 a which abuts against the outer side surface of the rotating shaft 2 .

[0035] The isolating member 6 includes an isolating ring 1 6b and an isolating ring 2 6c, both of which are solid and in the shape of an annular ring. The isolating ring 1 6b and the isolating ring 2 6c are arranged adjacent to each other up and down and are both sleeved on the outside of the rotating shaft 2. The inner side of the isolating ring 1 6b has an isolating portion 1 6d in the shape of an annular ring. The thickness of the isolating portion 1 6d along the axial direction gradually decreases from the outside to the inside, and the inner side surface of the isolating portion 1 6d abuts against the outer side surface of the rotating shaft 2. The cross-sectional shape of the isolating portion 1 6d is roughly conical. The inner side of the isolating ring 2 6c has an isolating portion 2 6e in the shape of an annular ring. The thickness of the isolating portion 2 6e along the axial direction gradually decreases from the outside to the inside, and the inner side surface of the isolating portion 2 6e abuts against the outer side surface of the rotating shaft 2. The cross-sectional shape of the isolating portion 2 6e is roughly conical. A compensation cavity 6f is formed between the isolating portion 1 6d and the isolating portion 2 6e, which allows the isolating portion 1 6d and the isolating portion 2 6e to bend inward.

[0036] The coil 5 is sleeved and fixed on the outside of the sealing cover. Figure 4As shown, the magnet 4 has an N pole and an S pole with the plane where its axis is located as a symmetrical surface, and the number of coils 5 is several, and the example shown in the figure is six, wherein each coil 5 is overlapped and wrapped around the outer side of the magnet 4 along the axial direction of the magnet 4, and each coil 5 includes a cutting section 1 5a arranged along the axial direction of the magnet 4 opposite to the N pole and a cutting section 2 5b arranged along the axial direction of the magnet 4 opposite to the S pole, and the cutting section 1 5a and the cutting section 2 5b are connected by a connecting section arranged along the radial direction of the magnet 4. That is, the coil 5 is wound in a square frame shape in the plane where the axis of the magnet 4 is located, and the cutting section 1 5a and the cutting section 2 5b are arranged on both sides of the magnet 4 and correspond to the positions of the N pole and the S pole respectively, so that when the magnet 4 rotates, the cutting section 1 5a and the cutting section 2 5b can simultaneously cut the magnetic flux lines and generate induced current. In actual installation, in order to make room for the rotating shaft 2, the coil 5 wound on the upper and lower ends of the magnet 4 can be folded.

[0037] The coil 5 is cylindrical and both ends of the coil 5 in the axial direction are beyond the upper and lower ends of the magnet 4. A shell 11 is also provided on the outside of the coil 5. The shell 11 is threadedly connected to the lower cover. A cylindrical steel ring 9 made of magnetic conductive material is also connected to the shell 11. The steel ring 9 is sleeved on the outside of the coil 5 and corresponds to the position of the magnet 4. In this embodiment, the steel ring 9 includes a plurality of annular steel rings, which are coaxially arranged and stacked in sequence to form the steel ring 9.

[0038] When the hydroelectric generator is in use, the water inlet 1a and the water outlet 1b of the housing 1 are connected to the corresponding pipelines respectively. After the water flows into the housing 1, it impacts the impeller 3 located in the water chamber 1d to rotate, and the rotating shaft 2 connected to the impeller 3 drives the magnet 4 and the sealing sleeve 7 located in the magnetic chamber 1c to rotate, thereby forming a rotating magnetic field, and the coil 5 outside the housing 1 cuts the magnetic flux lines to generate an induced current to complete power generation. In this power generation process, an isolation member 6 is set in the water passage 1e between the magnetic chamber 1c and the water chamber 1d of the hydroelectric generator, which is used to prevent impurities in the water chamber 1d from entering the magnetic chamber 1c and allow water to flow through, so that the water pressure on both sides of the isolation member 6 is balanced, which will not cause a significant impact on the use of the isolation member 6 and can prevent impurities from entering the magnetic chamber 1c, avoiding the situation where strong magnetic adsorption of impurities causes jamming.

[0039] When the magnet 4 rotates with the shaft 2, since there are no claw poles or other parts made of magnetic conductive materials in the housing 1, the magnet 4 is only subject to a very small magnetic resistance applied by the steel ring 9 during rotation. The magnet 4 rotates very smoothly and has a high utilization rate of the kinetic energy of the water.

[0040] In addition to the above technical solutions, the isolating member 6 may also include an annular isolating net 1 and an isolating net 2, which are adjacently arranged and sleeved on the outside of the rotating shaft 2, and the meshes of the isolating net 1 and the isolating net 2 are staggered. The steel ring 9 may adopt an integrated structure.

[0041] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A hydroelectric generator, comprising a housing (1), a rotating shaft (2), an impeller (3), a coil (5) and a magnet (4), wherein the housing (1) has a magnetic cavity (1c) and a water passage cavity (1d), the magnetic cavity (1c) and the water passage cavity (1d) are connected via a water passage (1e), the impeller (3) is arranged in the water passage cavity (1d), the magnet (4) is arranged in the magnetic cavity (1c) and no claw pole is arranged in the magnetic cavity (1c), the two ends of the rotating shaft (2) are respectively connected to the magnet (4) and the impeller (3), and the invention is characterized in that: An isolating member (6) capable of preventing impurities in the water passage (1d) from entering the magnetic chamber (1c) is arranged in the housing (1) at the water passage (1e). The coil (5) is cylindrical and is sleeved outside the magnet (4). A cylindrical steel ring (9) made of a magnetic conductive material is sleeved on the outer side of the coil (5). The steel ring (9) comprises a plurality of annular steel rings, which are coaxially arranged and stacked in sequence to form the steel ring (9).

2. The hydroelectric generator according to claim 1, characterized in that: The isolating member (6) is annular and sleeved on the outside of the rotating shaft (2); a seal is formed between the outside and / or end surface of the isolating member (6) and the inner wall of the housing (1); the inside of the isolating member (6) has an annular abutting surface (6a) and the abutting surface (6a) abuts against the outer side surface of the rotating shaft (2).

3. The hydroelectric generator according to claim 1 or 2, characterized in that: The isolating member (6) comprises an isolating ring 1 (6b) and an isolating ring 2 (6c), both of which are annular. The isolating ring 1 (6b) and the isolating ring 2 (6c) are arranged adjacent to each other and are both sleeved on the outside of the rotating shaft (2). The inner side of the isolating ring 1 (6b) comprises an isolating portion 1 (6d) in the form of an annular shape. The thickness of the isolating portion 1 (6d) along the axial direction gradually decreases from the outside to the inside, and the inner side of the isolating portion 1 (6d) abuts against the outer side surface of the rotating shaft (2). The inner side of the isolating ring 2 (6c) comprises an isolating portion 2 (6e) in the form of an annular shape. The thickness of the isolating portion 2 (6c) along the axial direction gradually decreases from the outside to the inside, and the inner side of the isolating portion 2 (6e) abuts against the outer side surface of the rotating shaft (2). A compensation cavity (6f) is formed between the isolating portion 1 (6d) and the isolating portion 2 (6e).

4. The hydroelectric generator according to claim 1 or 2, characterized in that: The isolation member (6) comprises an isolation net 1 and an isolation net 2, both of which are ring-shaped. The isolation net 1 and the isolation net 2 are arranged adjacent to each other and are both sleeved on the outside of the rotating shaft (2). The meshes of the isolation net 1 and the isolation net 2 are arranged in an alternating manner.

5. The hydroelectric generator according to claim 1 or 2, characterized in that: A sealing sleeve (7) is also provided in the magnetic cavity (1c); the magnet (4) is a strong magnet and is sealed in the sealing sleeve (7); the sealing sleeve (7) and the magnet (4) are both fixed to the rotating shaft (2).

6. The hydroelectric generator according to claim 5, characterized in that: An annular dynamic balancing ring (8) is also sleeved on the outer side of the rotating shaft (2), and the dynamic balancing ring (8) is fixed to the sealing sleeve (7).

7. The hydroelectric generator according to claim 1 or 2, characterized in that: The magnet (4) is cylindrical and has an N pole and an S pole with the plane where the axis of the magnet (4) is located as a symmetric plane. The coil (5) is wound along the axial direction of the magnet (4) and has a cutting section 1 (5a) opposite to the N pole and a cutting section 2 (5b) opposite to the S pole. The cutting section 1 (5a) and the cutting section 2 (5b) are connected by a connecting section.

8. The hydroelectric generator according to claim 1 or 2, characterized in that: A filter screen (10) is also connected to the water inlet (1a) of the housing (1).

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