Combined sealing device and submersible water-turbine generator set

Abstract

The utility model provides a combined type sealing device which comprises a shell and a main shaft, a base is arranged on the shell, the combined type sealing device further comprises a magnetic fluid sealing assembly and an inflation sealing assembly, the magnetic fluid sealing assembly comprises a gland and a sleeve, the gland and the sleeve are arranged around the main shaft respectively, and a cavity is defined by the gland and the sleeve. A permanent magnet, a first pole shoe and a second pole shoe are arranged in the cavity, the permanent magnet, the first pole shoe, the second pole shoe and the main shaft define a containing cavity, and the containing cavity is filled with magnetic fluid; the inflation sealing assembly comprises a sealing shroud ring and an air guide pipe, and the sealing shroud ring is located between the sleeve and the main shaft. The utility model further provides a submersible type water-turbine generator set which comprises the combined type sealing device. The sealing device solves the technical problems that a sealing device of an existing submersible power generation device is short in service life and inconvenient to protect, the technical effect that the service life of a combined device is prolonged while it is guaranteed that sealing is kept between the shell and the main shaft is achieved, and the sealing device is simple in structure and convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of power generation equipment, in particular to a combined sealing device and a submersible water turbine generator set with the combined sealing device. Background Art

[0002] A submersible hydro-turbine generator set is a device that converts water flow energy into electrical energy. Its principle is to use water flow as a power source and convert the kinetic energy of water flow into electrical energy through electromagnetic induction between the rotor and stator. It can be applied to various occasions in underwater environments, such as ocean energy utilization, hydropower generation, river water conservancy, underwater detection, etc.

[0003] Chinese utility model patent publication number CN209586578U discloses a submersible power generation device comprising a turbine assembly, a connecting bracket, and a generator. The connecting bracket is connected to the turbine assembly at one end and to the generator at the other. The turbine assembly comprises a header, a main shaft, and an impeller, the impeller being sleeved onto the main shaft and the header cover being positioned over the impeller. The header is fixedly connected to the connecting bracket, and the main shaft passes through the connecting bracket and is connected to the generator. This submersible power generation device generates electricity while submerged by directing water flow through the header. The water flow impacts the impeller, which in turn drives the main shaft, which in turn drives the generator.

[0004] The submersible power generation device disclosed in the above utility model patent uses a sealing device consisting of a sealing shell, a spring, a first gasket and a sealing ring to seal the connection between the main shaft and the generator. Since the sealing ring will wear and age during the operation of the submersible power generation device, even if the sealing ring is kept in contact with the rotating shaft of the generator under the action of the spring, the sealing ring will still affect the sealing effect when it is worn to a certain extent. At this time, the sealing ring needs to be replaced. Therefore, the service life of the sealing device is short and the submersible power generation device needs to be disassembled for maintenance, which is inconvenient. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present invention provides a combined sealing device and a submersible hydro-turbine generator set having the combined sealing device, which solves the problems in the prior art of short service life and inconvenient maintenance of the sealing device of the submersible power generation device.

[0006] According to an embodiment of the present utility model, a combined sealing device includes a shell and a main shaft, a base is provided on the shell surrounding the main shaft, and also includes a magnetic fluid sealing assembly and an inflatable sealing assembly, the magnetic fluid sealing assembly includes a pressure cover connected to the base and a sleeve connected to the pressure cover, the pressure cover and the sleeve are respectively arranged around the main shaft and the pressure cover and the sleeve form a chamber for accommodating part of the main shaft, a permanent magnet, a first pole shoe and a second pole shoe are provided in the chamber, the permanent magnet and the main shaft are spaced apart and the first pole shoe and the second pole shoe are respectively located on opposite sides of the permanent magnet, the permanent magnet, the first pole shoe, the second pole shoe and the main shaft form an accommodating chamber and the accommodating chamber is filled with magnetic fluid; the inflatable sealing assembly includes a connected sealing belt and an air duct, the sealing belt is arranged around the main shaft and the sealing belt is located between the sleeve and the main shaft, and the air duct passes through the sleeve at one end away from the sealing belt and extends out of the sleeve.

[0007] Furthermore, the main shaft includes a shaft body and a first shoulder and a second shoulder protruding from the shaft body, the first shoulder and the second shoulder are arranged at intervals along the axial direction of the shaft body, the end of the sleeve away from the pressure cover is aligned with the first shoulder and the sealing band is located between the sleeve and the first shoulder, and the pressure cover is aligned with the second shoulder.

[0008] Furthermore, two first tooth grooves are provided on the main shaft at intervals, the two first tooth grooves are aligned with the first pole shoe and the second pole shoe respectively, and the first pole shoe and the second pole shoe are respectively provided with second tooth grooves corresponding to the first tooth grooves.

[0009] Furthermore, comb teeth are respectively provided on one side of the sleeve close to the first shaft shoulder and one side of the gland close to the second shaft shoulder, and the sealing band is located within the comb teeth on the sleeve.

[0010] Furthermore, the sleeve is provided with a liquid injection hole, the liquid injection hole is communicated with the accommodating cavity, and a detachable hole plug is provided at one end of the liquid injection hole away from the accommodating cavity.

[0011] Furthermore, the magnetic fluid sealing assembly also includes a return ring arranged in the chamber, which is arranged around the main shaft and located between the first pole shoe and the second pole shoe. The return ring is provided with a return pipe passing through and the two ends of the return pipe are respectively close to the first pole shoe and the second pole shoe.

[0012] Furthermore, a threaded portion is provided on a surface of the recirculation ring close to the main shaft, and a threaded section is provided on an outer peripheral wall of the main shaft, and the threaded section is aligned with the threaded portion.

[0013] Furthermore, the sealing belt is provided with an air nozzle, which is communicated with the air duct and is detachably connected to the air duct.

[0014] Furthermore, a first sealing ring is provided between the sleeve and the first pole shoe, a second sealing ring is provided between the pressure cover and the second pole shoe, and a third sealing ring is provided between the sleeve and the pressure cover. The first sealing ring, the second sealing ring and the third sealing ring are respectively arranged around the main shaft.

[0015] On the other hand, according to an embodiment of the present invention, a submersible hydro-generator set is also provided, comprising the above-mentioned combined sealing device.

[0016] Compared with the prior art, the utility model has the following beneficial effects: by adopting a magnetic fluid sealing component and an inflatable sealing component to be sealed at the connection between the shell and the main shaft, the magnetic fluid sealing component is surrounded by a sleeve and an end cover to form a chamber, and a permanent magnet, a first pole shoe and a second pole shoe are arranged in the chamber to form a magnetic circuit with the main shaft, and the accommodating chamber surrounded by the permanent magnet, the first pole shoe, the second pole shoe and the main shaft is filled with magnetic fluid. When the main shaft rotates, the magnetic fluid gathers in the accommodating chamber to form a sealing body, thereby preventing external media from entering the interior of the submersible turbine generator set, and the magnetic fluid sealing component is not worn during the rotation of the main shaft. When the main shaft of a submersible hydro-turbine generator set is stopped for maintenance, air is inflated into the sealing belt through the air guide pipe to expand the sealing belt, so that the sealing belt fills the gap between the sleeve and the main shaft to prevent external media from entering. After the maintenance is completed, the sealing belt is deflated before the main shaft rotates again to separate the sealing belt from the main shaft, which can avoid wear of the sealing belt during the operation of the submersible hydro-turbine generator set. It solves the technical problems of the existing submersible power generation device with short service life and inconvenient maintenance, and produces the technical effect of ensuring that the seal between the shell and the main shaft is maintained while extending the service life. It has a simple structure and is easy to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a partial structural diagram of a submersible hydro-generator set according to the first embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of a portion of the structure of a submersible hydro-generator set according to the first embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of part of the structure of the submersible hydro-generator set according to the second embodiment of the present invention.

[0020] In the above drawings: 100, main shaft; 101, shaft body; 102, first shoulder; 103, second shoulder; 104, threaded section; 200, magnetic fluid sealing assembly; 201, sleeve; 202, first pole shoe; 203, first sealing ring; 204, permanent magnet; 205, second pole shoe; 206, pressure cover; 207, second sealing ring; 208, screw; 209, third sealing ring; 210, return ring; 2101, return pipe; 2102, threaded part; 300, inflation seal assembly; 310, inflation and deflation equipment; 320, air pipe; 330, sealing belt; 331, expansion body; 332, air nozzle; 400, base. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0022] Example 1

[0023] like Figure 1 and Figure 2 As shown, an embodiment of the present invention proposes a submersible hydro-turbine generator set, including a combined sealing device, which is installed at the connection between the shell and the main shaft 100 of the submersible hydro-turbine generator set, and is used to seal the connection between the shell and the main shaft 100 and prevent external media from entering the submersible hydro-turbine generator set when the submersible hydro-turbine generator set is immersed in the medium, causing equipment failure or even damage.

[0024] Please refer to Figure 1 and Figure 2The combined sealing device includes a magnetic fluid sealing component 200 and an inflatable sealing component 300, wherein the magnetic fluid sealing component 200 includes a gland 206 connected to the base 400 and a sleeve 201 connected to the gland 206, the gland 206 and the sleeve 201 are respectively arranged around the main shaft 100 and the gland 206 and the sleeve 201 enclose a chamber for accommodating part of the main shaft 100, the gland 206 and the sleeve 201 are respectively made of non-conductive materials, and a permanent magnet 204 is provided in the chamber. , the first pole shoe 202 and the second pole shoe 205, the ferromagnetic NdFeB material, the first pole shoe 202 and the second pole shoe 205 are respectively made of a strong magnetic conductive material, the permanent magnet 204 is spaced apart from the main shaft 100 and the first pole shoe 202 and the second pole shoe 205 are respectively located on opposite sides of the permanent magnet 204, the permanent magnet 204, the first pole shoe 202 and the second pole shoe 205 are respectively annular and arranged around the main shaft 100 to form a magnetic circuit with the main shaft 100, the permanent magnet 20 4. The first pole shoe 202, the second pole shoe 205 and the main shaft 100 form a receiving chamber, and the receiving chamber is filled with magnetic fluid. When the main shaft 100 rotates, the magnetic fluid gathers in the receiving chamber to form a seal to seal the connection between the housing and the main shaft 100; the inflatable seal assembly 300 includes a sealing belt 330 and an air guide tube 320 that are connected. The sealing belt 330 is arranged around the main shaft 100 and is located between the sleeve 201 and the main shaft 100. The air guide tube One end of 320 away from the sealing belt 330 passes through the sleeve 201 and extends out of the sleeve 201. The air duct 320 is used to inflate or deflate the sealing belt 330, and the sealing belt 330 expands and fills the gap between the main shaft 100 and the sleeve 201 when inflated to seal the connection between the shell and the main shaft 100. After the sealing belt 330 is deflated, it is separated from the main shaft 100, so that the sealing belt 330 does not contact the main shaft 100 during the rotation of the main shaft 100.

[0025] Specifically, the working process of the combined sealing device provided in this embodiment is as follows: when the submersible turbine generator set is operating normally and the main shaft 100 is rotating, the magnetic fluid is accumulated in the accommodating cavity as the main shaft 100 rotates, and the sealing body formed by the magnetic fluid seals the connection between the housing and the main shaft 100, thereby preventing the external medium from penetrating into the interior during the operation of the submersible turbine generator set, and the magnetic fluid sealing assembly 200 is not worn during the rotation of the main shaft 100; when the submersible turbine generator set is under maintenance, the main shaft 100 is 0 stops, at which time the sealing shroud 330 is inflated through the air guide pipe 320 to expand the sealing shroud 330. After the expansion, the sealing shroud 330 fills the gap between the sleeve 201 and the main shaft 100 to prevent the entry of external media, thereby maintaining a seal at the connection between the housing and the main shaft 100. After the maintenance is completed and before the submersible turbine generator set is restarted, the sealing shroud 330 is deflated. At this time, the sealing shroud 330 is separated from the main shaft 100 to prevent wear of the sealing shroud 330 during operation of the submersible turbine generator set. The combined sealing device provided in this embodiment can ensure that the seal between the housing and the main shaft 100 is maintained while extending the service life. The combined sealing device has a simple structure and is easy to assemble and disassemble, facilitating subsequent maintenance.

[0026] like Figure 2 As shown, the main shaft 100 includes a shaft body 101 and a first shoulder 102 and a second shoulder 103 protruding from the shaft body 101. The first shoulder 102 and the second shoulder 103 are arranged at intervals along the axial direction of the shaft body 101. The end of the sleeve 201 away from the pressure cover 206 is aligned with the first shoulder 102 and the sealing band 330 is located between the sleeve 201 and the first shoulder 102. The pressure cover 206 is aligned with the second shoulder 103. The main shaft 100 includes a shaft body 101 and the first shoulder 102 and the second shoulder 103 arranged on the shaft body 101. The radius of the first shoulder 102 and the radius of the second shoulder 103 are respectively larger than the radius of the shaft body 101, and the first shoulder 102 is aligned with the end of the sleeve 201, and the second shoulder 103 is aligned with the pressure cover 206 to position the sleeve 201 and the pressure cover 206, so as to facilitate the assembly of the magnetic fluid sealing assembly 200. At the same time, by respectively arranging the first shoulder 102 and the second shoulder 103 on both sides of the chamber, the magnetic fluid in the accommodating cavity can be prevented from leaking, thereby improving the reliability of the magnetic fluid sealing assembly 200.

[0027] In detail, two first tooth grooves are provided on the main shaft 100 at intervals, and the two first tooth grooves are aligned with the first pole shoe 202 and the second pole shoe 205 respectively, and the first pole shoe 202 and the second pole shoe 205 are respectively provided with second tooth grooves corresponding to the first tooth grooves. By arranging two first tooth grooves on the main shaft 100 at intervals, and arranging second tooth grooves corresponding to the first tooth grooves on the first pole shoe 202 and the second pole shoe 205 respectively, the magnetic fluid is gathered between the first tooth groove and the second tooth groove under the action of the magnetic field, thereby further improving the sealing performance of the magnetic fluid sealing device while preventing the magnetic fluid from leaking out of the accommodating cavity. The number of pole teeth of the first tooth groove and the second tooth groove is designed according to the depth at which the submersible hydro-turbine generator set is working. The number of pole teeth increases by one for every 0.5m-1.0m of immersion of the submersible hydro-turbine generator set, and the tooth groove width of the pole teeth is 1.5mm-2.0mm, the tooth width is 0.5mm-1.0mm, the tooth height is 1.5mm-2.0mm, and the sealing gap is 0.05mm-0.3mm.

[0028] Please refer to Figure 2 The sleeve 201 has comb teeth on one side close to the first shoulder 102 and the gland 206 has comb teeth on one side close to the second shoulder 103. The sealing band 330 is located within the comb teeth on the sleeve 201. The comb teeth on the sleeve 201 and the gland 206 serve to assist in sealing, thereby reducing the ingress of external media and impurities into the chamber and preventing the magnetic fluid from overflowing. The sealing band 330 is located within the tooth grooves of the comb teeth on the sleeve 201 away from the gland 206, so that the position of the sealing band 330 on the sleeve 201 remains stable.

[0029] In this embodiment, the sleeve 201 is provided with an injection hole that communicates with the accommodating chamber. A removable plug is provided at one end of the injection hole away from the accommodating chamber. The injection hole is used to inject magnetic fluid into the accommodating chamber, facilitating replenishment or replacement of magnetic fluid in the magnetic fluid sealing device. A removable plug is provided at the end of the injection hole to seal the injection hole, preventing foreign matter from entering through the injection hole and preventing leakage of the magnetic fluid.

[0030] like Figure 1 and Figure 2As shown, the magnetic fluid sealing assembly 200 further includes a return ring 210 disposed in the chamber. The return ring 210 is disposed around the spindle 100 and is located between the first pole shoe 202 and the second pole shoe 205. A return pipe 2101 is provided through the return ring 210, and the two ends of the return pipe 2101 are respectively close to the first pole shoe 202 and the second pole shoe 205. The number of the return pipes 2101 is an even number and is arranged at equal intervals along the circumference of the spindle 100. The return ring 210 disposed in the chamber is used to improve the fluidity of the magnetic fluid in the accommodating cavity, so that the magnetic fluid maintains stability in the accommodating groove while protecting the magnetic fluid. The axial direction of the return pipe 2101 intersects with the axial direction of the spindle 100, so that the magnetic fluid can circulate in the accommodating cavity under the action of the magnetic circuit, thereby enhancing the reliability of the magnetic fluid sealing assembly 200.

[0031] Specifically, the return ring 210 has a threaded portion 2102 on a surface adjacent to the spindle 100. A threaded segment 104 is provided on the outer peripheral wall of the spindle 100, and the threaded segment 104 is aligned with the threaded portion 2102. When the spindle 100 rotates, the thrust generated by the threaded segment 104 on the outer peripheral wall of the spindle 100 and the threaded portion 2102 on the return ring 210 causes the magnetic fluid in the accommodating chamber to circulate within the accommodating chamber, ensuring the stability and reliability of the magnetic fluid sealing assembly 200.

[0032] like Figure 2 As shown, the inflatable sealing assembly 300 also includes an inflation and deflation device 310, which includes an air compressor, a pressure storage tank, an electromagnetic valve group, a pressure transmitter, a built-in air pipe 320 and other components. The inflation and deflation device 310 is used to add air to the sealing belt 330 to expand the sealing belt 330 or to deflate the sealing belt 330 to shrink the sealing belt 330. When the pressure of the pressure storage tank is insufficient, the air compressor automatically inflates the air, and the pressure transmitter can automatically control the start and stop of the air compressor according to the operating status of the submersible turbine generator set and the pressure of the pressure storage tank. The built-in air pipe 320 is used to supply air to the sealing belt 330 and guide the gas in the sealing belt to be discharged.

[0033] In detail, the sealing band 330 is provided with an air nozzle 332, which is in communication with the air duct 320 and is detachably connected to the air duct 320. The air nozzle 332 is used to connect the sealing band 330 to the air duct 320. Inserting the air duct 320 into the sleeve 201 facilitates connecting the air duct 320 to the air nozzle 332. When the sealing band 330 is no longer needed, the air duct 320 can be removed. After the air duct 320 is removed, the air nozzle 332 seals the sealing band 330, keeping it in an inflated or deflated state, thereby facilitating the use of the inflatable sealing assembly 300.

[0034] In this embodiment, the sealing belt 330 includes an expansion body 331 made of rubber, which makes the sealing belt 330 have good elasticity. The cross-section of the expansion body 331 is square-shaped and the expansion body 331 is a hollow structure with thick upper and lower parts and thin sides, ensuring that the expansion body 331 expands smoothly when the sealing belt 330 is inflated.

[0035] Please refer to Figure 2 A first sealing ring 203 is provided between the sleeve 201 and the first pole shoe 202, a second sealing ring 207 is provided between the pressure cover 206 and the second pole shoe 205, and a third sealing ring 209 is provided between the sleeve 201 and the pressure cover 206. The first sealing ring 203, the second sealing ring 207 and the third sealing ring 209 are respectively arranged around the main shaft 100. Grooves are respectively provided on one side of the sleeve 201 close to the first pole shoe 202, one side of the pressure cover 206 close to the second pole shoe 205, and one side of the sleeve 201 close to the pressure cover 206, and the grooves are used to accommodate the first sealing ring 203, the second sealing ring 207 and the third sealing ring 209, and the cross-section of the grooves is rectangular or triangular, the first sealing ring 203, the second sealing ring 207 and the third sealing ring 209 are respectively "O" rings made of rubber material, and the first sealing ring 203, the second sealing ring 207 and the third sealing ring 209 are respectively arranged around the main shaft 100, and after the combined sealing device is assembled, the first sealing ring 203, the second sealing ring 207 and the third sealing ring 209 are respectively pressed in the corresponding grooves, which can further improve the sealing performance of the combined sealing device.

[0036] like Figure 2 As shown, in this embodiment, the sleeve 201 , the pressure cover 206 and the base 400 are assembled into one body by using screws 208 .

[0037] Example 2

[0038] Please refer to Figure 3The second embodiment of the present invention is another technical solution for the structure of the base 400, the sleeve 201 and the pressure cover 206 based on the first embodiment. The only difference from the first embodiment is that the structure of the base 400, the sleeve 201 and the pressure cover 206 is different.

[0039] like Figure 3 As shown, in this embodiment, the pressure cover 206 and the sleeve 201 are combined into one by a threaded connection, and the pressure cover 206 and the base 400 are also combined into one by a threaded connection, so as to improve the structural stability of the combined sealing device and facilitate the assembly and disassembly of the combined sealing device.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A combined sealing device comprising a housing and a main shaft, wherein a base is provided on the housing surrounding the main shaft, characterized in that: It also includes a magnetic fluid sealing component and an inflatable sealing component, the magnetic fluid sealing component includes a pressure cover connected to the base and a sleeve connected to the pressure cover, the pressure cover and the sleeve are respectively arranged around the main shaft, and the pressure cover and the sleeve form a chamber for accommodating part of the main shaft, a permanent magnet, a first pole shoe and a second pole shoe are provided in the chamber, the permanent magnet and the main shaft are spaced apart and the first pole shoe and the second pole shoe are respectively located on opposite sides of the permanent magnet, the permanent magnet, the first pole shoe, the second pole shoe and the main shaft form a accommodating chamber and the accommodating chamber is filled with magnetic fluid; the inflatable sealing component includes a connected sealing belt and an air duct, the sealing belt is arranged around the main shaft and the sealing belt is located between the sleeve and the main shaft, and the air duct passes through the sleeve at one end away from the sealing belt and extends out of the sleeve.

2. A combined sealing device according to claim 1, characterized in that: The main shaft includes a shaft body and a first shoulder and a second shoulder protruding from the shaft body. The first shoulder and the second shoulder are arranged at intervals along the axial direction of the shaft body. The end of the sleeve away from the pressure cover is aligned with the first shoulder and the sealing band is located between the sleeve and the first shoulder. The pressure cover is aligned with the second shoulder.

3. A combined sealing device according to claim 2, characterized in that: Two first tooth grooves are spaced apart on the main shaft, and the two first tooth grooves are respectively aligned with the first pole shoe and the second pole shoe, and the first pole shoe and the second pole shoe are respectively provided with second tooth grooves corresponding to the first tooth grooves.

4. A combined sealing device according to claim 2, characterized in that: Comb teeth are respectively provided on one side of the sleeve close to the first shaft shoulder and one side of the pressure cover close to the second shaft shoulder, and the sealing band is located inside the comb teeth on the sleeve.

5. A combined sealing device according to claim 1, characterized in that: The sleeve is provided with a liquid injection hole, which is communicated with the accommodating cavity. A detachable hole plug is provided at one end of the liquid injection hole away from the accommodating cavity.

6. A combined sealing device according to claim 1, characterized in that: The magnetic fluid sealing assembly also includes a return ring arranged in the chamber, which is arranged around the main shaft and located between the first pole shoe and the second pole shoe. A return pipe is provided through the return ring and the two ends of the return pipe are respectively close to the first pole shoe and the second pole shoe.

7. A combined sealing device according to claim 6, characterized in that: A threaded portion is provided on one side of the recirculation ring close to the main shaft, and a threaded section is provided on the outer peripheral wall of the main shaft, and the threaded section is aligned with the threaded portion.

8. The combined sealing device according to claim 1, characterized in that: The sealing belt is provided with an air nozzle, which is communicated with the air duct and is detachably connected to the air duct.

9. The combined sealing device according to claim 1, characterized in that: A first sealing ring is provided between the sleeve and the first pole shoe, a second sealing ring is provided between the pressure cover and the second pole shoe, and a third sealing ring is provided between the sleeve and the pressure cover. The first sealing ring, the second sealing ring and the third sealing ring are respectively arranged around the main shaft.

10. A submersible hydro-generator set, characterized by: The invention comprises the combined sealing device according to any one of claims 1 to 9.

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