Magnetic fluid sealing type water-turbine generator set

Abstract

The magnetic fluid sealing type water-turbine generator set comprises a main shaft, one end of the main shaft is connected with a generator, and the other end of the main shaft is connected with a rotating wheel; the shaft sleeve is connected with the main shaft and located between the generator set and the rotating wheel; the magnetic fluid supporting piece and the main shaft form a closed cavity, and the generator is located in the closed cavity; the shaft sleeve and the magnetic fluid supporting piece form a first flow channel and a second flow channel which are connected through the gap, the first flow channel is provided with an opening for water flow to enter, sealing liquid is arranged in the first flow channel, a gas column and a magnetic fluid sealing assembly are arranged in the second flow channel, and the gas column is sealed through the magnetic fluid sealing assembly and the sealing liquid. Water sealing is converted into gas sealing, non-contact type sealing is achieved, the problems of irreversible changes such as heating and deformation caused by contact type sealing are avoided, meanwhile, abrasion to the generator set is small, and frequent detection and overhaul are not needed.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic fluid sealing, and in particular to a magnetic fluid sealing type water turbine generator set. Background Art

[0002] During the operation of a hydroelectric generator set, water flows through the impeller to drive the generator to rotate and generate electricity. If the main shaft leaks, it will cause serious damage to the generator set, so it needs to be sealed. At present, the sealing of hydroelectric generator sets usually adopts mechanical seals or packing seals. Mechanical seals achieve sealing by tightly fitting the end faces of the dynamic ring and the static ring. Packing seals achieve sealing by filling the packing between the shaft and the stuffing box, relying on the pressing force of the gland to make the packing produce elastic deformation, filling the gap between the shaft and the stuffing box, thereby achieving sealing.

[0003] Both of the above-mentioned sealing methods are contact seals. After exceeding a certain service life, they will produce irreversible changes such as heating and deformation, thus causing water leakage accidents. In addition, contact seals cause greater wear and tear on the generator set, so frequent inspection and maintenance are required. Summary of the invention

[0004] In view of this, the present invention provides a magnetic fluid sealed hydro-turbine generator set, which can avoid the problems caused by contact seals to a certain extent. Specifically:

[0005] Provided is a magnetic fluid sealed hydro-turbine generator set, comprising:

[0006] A main shaft, one end of which is connected to a generator, and the other end of which is connected to a runner;

[0007] A shaft sleeve, the shaft sleeve is connected to the main shaft and is located between the generator set and the runner;

[0008] A magnetic fluid support, wherein the magnetic fluid support and the main shaft form a closed cavity, and the generator is located in the closed cavity;

[0009] The sleeve and the magnetic fluid support form a first flow channel and a second flow channel connected to each other through a gap. The first flow channel is provided with an opening for water to enter, and a sealing liquid is provided in the first flow channel. The second flow channel is provided with a gas column and a magnetic fluid sealing assembly. The magnetic fluid sealing assembly and the sealing liquid seal the gas column.

[0010] According to a preferred embodiment, the magnetic fluid sealing assembly includes a magnetic component and a magnetic fluid, and the magnetic component is arranged on the magnetic fluid support component.

[0011] According to a preferred embodiment, a plurality of magnetic attracting members are provided on the magnetic fluid support member, and two adjacent magnetic attracting members are arranged at a certain interval.

[0012] According to a preferred embodiment, the first flow channel is annular, and the second flow channel is linear.

[0013] According to a preferred embodiment, the sealing liquid is located in the rear half of the first flow channel and is in contact with the gas column.

[0014] According to a preferred embodiment, in the second flow channel, the gas column includes a first gas column and a second gas column, the magnetic fluid sealing assembly includes a first magnetic fluid sealing assembly and a second magnetic fluid sealing assembly, the first magnetic fluid sealing assembly and the sealing liquid seal the first gas column, and the second magnetic fluid sealing assembly and the first magnetic fluid sealing assembly seal the second gas column.

[0015] According to a preferred embodiment, the rotating wheel is connected to the main shaft via a flange structure.

[0016] According to a preferred embodiment, the runner is a reaction turbine runner or an impulse turbine runner.

[0017] Furthermore, the shaft sleeve is made of a corrosion-resistant metal material or a composite material.

[0018] Furthermore, the sealing liquid is a grease-based liquid.

[0019] The present invention forms a first flow channel and a second flow channel connected to each other by utilizing the gap between the shaft sleeve and the magnetic fluid support, and arranges a sealing liquid in the first flow channel where the water flows, and arranges a gas column and a magnetic fluid sealing component in the second flow channel. The gas column is sealed by the magnetic fluid sealing component and the sealing liquid. The pressure of the water flow is greatly alleviated through the conduction of the sealing liquid, the gas column and the magnetic fluid sealing component, and the pressure pulsation and vortex fluctuation are greatly reduced. At the same time, the magnetic fluid sealing component has low friction, can achieve zero leakage, and has a stable sealing effect on the gas column. The present invention realizes a non-contact seal by converting the seal of water into a seal of gas, avoiding the problem of irreversible changes such as heat and deformation caused by contact seals, and at the same time, the wear of the generator set is small, and frequent inspection and maintenance are not required. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a magnetic fluid sealed hydro-generator set of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of the first and second flow channels of the magnetic fluid sealed hydro-turbine generator set.

[0022] Explanation of the reference numerals: 1-wheel, 2-main shaft, 3-generator, 4-water flow, 5-magnetic fluid support, 6-sleeve, 7-sealing liquid, 8-first gas column, 9-first magnetic component, 10-first magnetic fluid, 11-second gas column, 12-second magnetic fluid, 13-second magnetic component. DETAILED DESCRIPTION

[0023] During the operation of a hydroelectric generator set, water flows through the impeller to drive the generator to rotate and generate electricity. If the main shaft leaks, it will cause serious damage to the generator set, so it needs to be sealed. At present, the sealing of hydroelectric generator sets usually adopts mechanical seals or packing seals. Mechanical seals achieve sealing by tightly fitting the end faces of the dynamic ring and the static ring. Packing seals achieve sealing by filling the packing between the shaft and the stuffing box, relying on the pressing force of the gland to make the packing produce elastic deformation, filling the gap between the shaft and the stuffing box, thereby achieving sealing.

[0024] Both of the above-mentioned sealing methods are contact seals. After exceeding a certain service life, the components will undergo irreversible changes such as heating and deformation, thus causing water leakage accidents. In addition, contact seals cause greater wear and tear on the generator set, so frequent inspection and maintenance are required.

[0025] In view of this, the present invention discloses a magnetic fluid sealed hydro-turbine generator set, which is based on magnetic fluid sealing technology and can overcome the problems existing in mechanical seals or packing seals in the prior art to a certain extent.

[0026] Specifically, Figure 1 and Figure 2 As shown, the present invention discloses a magnetic fluid sealed hydro-turbine generator set, comprising:

[0027] A main shaft 2, one end of which is connected to a generator 3, and the other end of which is connected to a runner 1;

[0028] A shaft sleeve 6, the shaft sleeve 6 is connected to the main shaft 2 and is located between the generator set and the runner 1;

[0029] A magnetic fluid support 5, wherein the magnetic fluid support 5 and the main shaft 2 form a closed cavity, and the generator 3 is located in the closed cavity;

[0030] The sleeve 6 and the magnetic fluid support 5 form a first flow channel and a second flow channel connected to each other through a gap. The first flow channel is provided with an opening for the water flow 4 to enter, and a sealing liquid 7 is provided in the first flow channel. A gas column and a magnetic fluid sealing assembly are provided in the second flow channel. The magnetic fluid sealing assembly and the sealing liquid 7 seal the gas column.

[0031] The specific working process of a magnetic fluid sealed hydro-turbine generator set disclosed in the present invention is as follows: the runner 1 rotates under the action of high head potential energy and kinetic energy, driving the main shaft 2, the sleeve 6 and the generator 3 to rotate. At the same time, the water wheel disturbs the water flow 4 to generate pressure pulsation and unstable vortex. The sleeve 6 and the support member form a first flow channel and a second flow channel connected to each other through a gap. The water flow 4 enters the first flow channel through the opening of the first flow channel, and transmits the pressure to the sealing liquid 7 in the first flow channel. The sealing liquid 7 then transmits the pressure to the gas column in the second flow channel. Since the magnetic fluid sealing assembly and the sealing liquid 7 seal the gas column, the pressure pulsation and vortex fluctuation of the water flow 4 in the flow channel are greatly reduced, which plays a rectifying role and reduces the sealing pressure. Therefore, through the transmission and relief of the above-mentioned pressure, the generator 3 located in the closed cavity formed by the magnetic fluid support 5 and the main shaft 2 is perfectly sealed.

[0032] The present invention forms a first flow channel and a second flow channel connected to each other by utilizing the gap between the sleeve 6 and the magnetic fluid support 5, and sets a sealing liquid 7 in the first flow channel where the water flow 4 enters, and sets a gas column and a magnetic fluid sealing component in the second flow channel. The gas column is sealed by the magnetic fluid sealing component and the sealing liquid 7. The pressure of the water flow 4 is greatly alleviated through the conduction of the sealing liquid 7, the gas column and the magnetic fluid sealing component, and the pressure pulsation and vortex fluctuation are greatly reduced. At the same time, the magnetic fluid sealing component has low friction, can achieve zero leakage, and has a stable sealing effect on the gas column. The present invention realizes a non-contact seal by converting the seal of water into a seal of gas, avoiding the problem of irreversible changes such as heat and deformation caused by contact seals, and at the same time, the wear of the generator set is small, and frequent inspection and maintenance are not required.

[0033] According to a preferred embodiment, the magnetic fluid sealing assembly includes a magnetic component and a magnetic fluid, and the magnetic component is arranged on the magnetic fluid support 5. The magnetic component can be a permanent magnet to generate a magnetic field, and the magnetic field is guided by a magnetic pole shoe to form a gradient magnetic field at the sealing gap, so that the magnetic fluid is adsorbed to the magnetic pole gap in the gradient magnetic field to form a liquid sealing ring.

[0034] Furthermore, there are several magnetic parts on the magnetic fluid support 5, and two adjacent magnetic parts are arranged at a certain interval. By setting several magnetic parts, a multi-level magnetic fluid seal is formed to decompose the pressure difference step by step to ensure the sealing reliability and stability in high-pressure and high-speed scenarios.

[0035] Furthermore, the first flow channel is annular, and the second flow channel is linear.

[0036] like Figure 1 and Figure 2As shown, the first flow channel provided with the sealing liquid 7 is an "S"-shaped structure, which can also be regarded as two connected "U"-shaped structures; the second flow channel provided with the gas column and the magnetic fluid sealing component is a connection structure of multiple line segments. The "S"-shaped design of the first flow channel can promote the uniformity of the flow velocity distribution (especially in low-speed laminar flow) by changing the flow direction multiple times, decompose the large-scale eddy current into smaller eddy currents, and reduce the turbulence intensity; the second flow channel is a linear design, which is conducive to the position setting of the gas column and the magnetic fluid sealing component, and is convenient for further rectifying.

[0037] In other embodiments, the types of the first flow channel and the second flow channel may be adjusted as needed, such as a "Z" type, to achieve different rectification effects.

[0038] Furthermore, the sealing liquid 7 is located in the rear half of the first flow channel and contacts the gas column. As mentioned above, the first flow channel provided with the sealing liquid 7 can be regarded as two connected "U"-shaped structures. The water flow 4 first enters the first "U" shape to reduce pressure pulsation and vortex fluctuations, and plays an initial rectification role. Then, the water flow 4 contacts the sealing liquid 7 at the second "U" shape, and the reduced pressure is transmitted to the sealing liquid 7. In this way, the structural characteristics are fully considered to achieve the maximum structural utilization.

[0039] Furthermore, in the second flow channel, the gas column includes a first gas column 8 and a second gas column 11, and the magnetic fluid sealing assembly includes a first magnetic fluid sealing assembly and a second magnetic fluid sealing assembly. The first magnetic fluid sealing assembly and the sealing liquid 7 seal the first gas column 8, and the second magnetic fluid sealing assembly and the first magnetic fluid sealing assembly seal the second gas column 11.

[0040] The first magnetic fluid sealing component includes a first magnetic part 9 and a first magnetic fluid 10, and the second magnetic fluid sealing component includes a second magnetic part 13 and a second magnetic fluid 12. After the water flow 4 passes through the first flow channel and forms a relatively stable water flow 4, the pressure is first transmitted to the sealing liquid 7, and then the sealing liquid 7 transmits the pressure to the first gas column 8 sealed by the first magnetic fluid sealing component and the sealing liquid 7. Similarly, the remaining slight pressure is transmitted to the second gas column 11 sealed by the second magnetic fluid sealing component and the first magnetic fluid sealing component, forming a form in which two gas columns and the sealing liquid 7 jointly transmit the sealing pressure.

[0041] Among them, Figure 2 As shown, the first magnetic fluid sealing component is preferably arranged in the direction close to the sleeve 6, and the second magnetic fluid sealing component is preferably arranged in the direction close to the main shaft 2, so as to relieve the sealing pressure in multiple directions. The first magnetic member 9 and the second magnetic member 13 can be connected to the magnetic fluid support member 5 by bonding or fixing means.

[0042] According to a preferred embodiment, the runner 1 is connected to the main shaft 2 through a flange structure. According to a general design, the flange structure may include a flange, bolts, and nuts. The flange is designed as a round or square metal plate and is provided with bolt holes. The flanges of the runner 1 and the main shaft 2 are connected together by bolts. The flange structure is simple, the connection is firm, it can withstand large torque and pressure, it is easy to disassemble and install, and it is convenient to maintain and overhaul the runner 1 and the main shaft 2.

[0043] According to a preferred embodiment, the runner 1 is a reaction turbine runner 1 or an impulse turbine runner 1 .

[0044] Among them, the reaction turbine runner 1 is suitable for large and medium-sized hydropower stations, has high efficiency under stable working conditions, and has various types of adjustable blades; the impulse turbine runner 1 is suitable for small hydropower stations, has a relatively simple structure, relatively low efficiency, but better adaptability to load changes.

[0045] Furthermore, the shaft sleeve 6 is made of a corrosion-resistant metal material or a composite material, and is subjected to large mechanical stress, taking into account the strength, hardness and toughness of the material.

[0046] Furthermore, the sealing liquid 7 is a grease-based liquid with high viscosity and good filling performance.

[0047] The above is a detailed introduction to a magnetic fluid sealed hydro-turbine generator set provided by an embodiment of the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A magnetic fluid sealed hydro-turbine generator set, characterized in that: include: A main shaft, one end of which is connected to a generator, and the other end of which is connected to a runner; A shaft sleeve, the shaft sleeve is connected to the main shaft and is located between the generator set and the runner; A magnetic fluid support, wherein the magnetic fluid support and the main shaft form a closed cavity, and the generator is located in the closed cavity; The sleeve and the magnetic fluid support form a first flow channel and a second flow channel connected to each other through a gap. The first flow channel is provided with an opening for water to enter, and a sealing liquid is provided in the first flow channel. The second flow channel is provided with a gas column and a magnetic fluid sealing assembly. The magnetic fluid sealing assembly and the sealing liquid seal the gas column.

2. The magnetic fluid sealed hydro-turbine generator set according to claim 1, characterized in that: The magnetic fluid sealing component comprises a magnetic component and a magnetic fluid, and the magnetic component is arranged on the magnetic fluid supporting component.

3. The magnetic fluid sealed hydro-turbine generator set according to claim 2, characterized in that: There are a plurality of magnetic attracting members on the magnetic fluid supporting member, and two adjacent magnetic attracting members are arranged at a certain interval.

4. The magnetic fluid sealed hydro-turbine generator set according to claim 1, characterized in that: The first flow channel is annular, and the second flow channel is linear.

5. The magnetic fluid sealed hydro-turbine generator set according to claim 1, characterized in that: The sealing liquid is located in the rear half of the first flow channel and is in contact with the gas column.

6. The magnetic fluid sealed hydro-turbine generator set according to claim 1, characterized in that: In the second flow channel, the gas column includes a first gas column and a second gas column, and the magnetic fluid sealing component includes a first magnetic fluid sealing component and a second magnetic fluid sealing component. The first magnetic fluid sealing component and the sealing liquid seal the first gas column, and the second magnetic fluid sealing component and the first magnetic fluid sealing component seal the second gas column.

7. The magnetic fluid sealed hydro-turbine generator set according to claim 1, characterized in that: The rotating wheel is connected to the main shaft via a flange structure.

8. The magnetic fluid sealed hydro-turbine generator set according to claim 1, characterized in that: The runner is a reaction turbine runner or an impulse turbine runner.

9. The magnetic fluid sealed hydro-turbine generator set according to claim 1, characterized in that: The shaft sleeve is made of a corrosion-resistant metal material or a composite material.

10. The magnetic fluid sealed hydro-turbine generator set according to claim 1, characterized in that: The sealing liquid is a grease-based liquid.

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