Sealing structure for water-turbine generator set

Abstract

The sealing structure comprises a pressing sealing part and an air inflation bag cavity integrally connected to the lower portion of the pressing sealing part, the pressing sealing part and the air inflation bag cavity extend in the radial direction of the air inflation bag cavity to form a long strip shape, the two ends of the air inflation bag cavity are closed, and the air inflation bag cavity is connected with the pressing sealing part. And a valve core is embedded in the pressing sealing part and is used for inflating or deflating the inflatable bag cavity. According to the sealing structure for the water-turbine generator set, an original upper rack cover plate seal can be replaced, the sealing installation difficulty is reduced, the gap sealing installation efficiency of the upper rack cover plate of a generator is improved, and installation can be completed only by plugging the air bag into the gap of the cover plate and then inflating the valve core.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing of hydro-generator units, and particularly relates to a sealing structure for hydro-generator units. Background Art

[0002] The upper frame cover plate of the generator of a Francis hydro-generator unit is an important part of the generator, which can prevent foreign objects from falling into the upper part of the generator rotor and plays an important role in the stable operation of the generator. Since the temperature difference inside the generator is relatively large during the operation and shutdown of the generator set and vibrations will occur, there are certain gaps between the upper frame cover plates of the generator when installed to prevent the cover plates from being squeezed and deformed due to thermal expansion or vibration. For the gaps of the cover plates, sealing is required to prevent foreign objects from falling into the generator and damaging the generator.

[0003] At present, the gap seal of the upper frame cover plate of the generator adopts a special-shaped seal, including a rubber seal and a seal limiting part, and the seal limiting part is connected to the rubber seal. During installation, the seal limiting part needs to be forcibly inserted into the gap of the upper frame cover plate, and a rubber hammer is required for pounding during the installation process. The installation is quite laborious and the installation efficiency is low. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a sealing structure for hydro-generator units in view of the deficiencies of the prior art. This sealing structure can replace the original seal of the upper frame cover plate, reduce the installation difficulty of the seal, improve the installation efficiency of the gap seal of the upper frame cover plate of the generator, and only need to insert the airbag into the gap of the cover plate and then inflate the valve core to complete the installation.

[0005] The technical purpose of the utility model is achieved through the following technical solutions:

[0006] A sealing structure for hydro-generator units includes a pressing seal part and an airbag cavity integrally connected to the lower part of the pressing seal part. The pressing seal part and the airbag cavity are both extended along the radial direction of the airbag cavity to form a strip shape. Both ends of the airbag cavity are closed, and a valve core is embedded in the pressing seal part. The valve core is used to inflate or deflate the airbag cavity.

[0007] Preferably, the pressing seal part includes a pressing part and a connecting part. The connecting part is connected between the pressing part and the airbag cavity. The cross-section of the pressing part is configured as a semicircle, semi-ellipse, rectangle or trapezoid.

[0008] Preferably, the cross-section of the airbag cavity is configured as a circle, rectangle, trapezoid or ellipse.

[0009] Preferably, the valve core extends into the air bag cavity, and a pressure-bearing part is constructed at the bottom end of the valve core, and the pressure-bearing part is used to abut against the inner wall of the air bag cavity.

[0010] Preferably, the outer wall surface of the pressure-bearing part is configured to be adapted to the inner wall of the air bag cavity, so that the top surface of the pressure-bearing part is fully abutted against the inner wall of the air bag cavity after bearing pressure in the inflated state of the air bag cavity.

[0011] Preferably, the top surface of the pressure-bearing part is configured as a spherical surface.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] A sealing structure for a water turbine generator set provided by the utility model can completely replace the original sealing of the upper frame cover plate, reduce the sealing installation difficulty, and improve the installation efficiency of the clearance sealing of the upper frame cover plate of the generator.

[0014] The utility model also has the characteristics of simple structure, low manufacturing cost and good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the utility model.

[0016] Figure 2 is a schematic connection diagram of the valve core and the air bag cavity in the utility model.

[0017] Figure 3 is an installation schematic diagram of the utility model.

[0018] In the above-mentioned drawings: 1. Pressing and sealing part; 2. Air bag cavity; 3. Valve core; 4. Pressure-bearing part; 11. Pressing part; 12. Connecting part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0020] As a preferred embodiment of the present utility model, as Figures 1 - 3As shown in the figure, this embodiment provides a sealing structure for a hydro-generator set, which includes a pressing sealing part 1 and an airbag cavity 2 integrally connected to the lower part of the pressing sealing part 1. Both the pressing sealing part 1 and the airbag cavity 2 are constructed in a strip shape along the radial direction of the airbag cavity 2. Both ends of the airbag cavity 2 are closed. A valve core 3 is embedded in the pressing sealing part 1, and the valve core 3 is used to inflate or deflate the airbag cavity 2. Both the pressing sealing part 1 and the airbag cavity 2 can be made of rubber materials.

[0021] In some embodiments, as Figure 1 shown, in order to facilitate the clearance adaptation and installation with the upper frame cover plate of the generator, in this embodiment, the pressing sealing part 1 includes a pressing part 11 and a connecting part 12. The connecting part 12 is connected between the pressing part 11 and the airbag cavity 2. The cross-section of the pressing part 11 is constructed as a semicircle, semi-ellipse, rectangle or trapezoid. Of course, it can also be other interface forms, such as a triangle. Without affecting the pressing effect, the purpose of the present utility model can be achieved.

[0022] In some embodiments, the valve core 3 extends into the airbag cavity 2. In order to enable the valve core 3 to effectively abut against the airbag cavity 2, provide a reaction force and ensure the sealing effect, in this embodiment, a pressure-bearing part 4 is constructed at the bottom end of the valve core 3, and the pressure-bearing part 4 is used to abut against the inner wall of the airbag cavity 2.

[0023] In some preferred embodiments, the outer wall surface of the pressure-bearing part 4 is constructed to be adapted to the inner wall of the airbag cavity 2, so that the top surface of the pressure-bearing part 4 is fully abutted against the inner wall of the airbag cavity 2 after being pressured in the inflated state of the airbag cavity 2.

[0024] In some preferred embodiments, in order to enable the top surface of the pressure-bearing part 4 to be fully abutted against the inner wall of the airbag cavity 2 after being pressured in the inflated state of the airbag cavity 2, in this embodiment, the top surface of the pressure-bearing part is constructed as a spherical surface. It can be understood that when the top surface of the pressure-bearing part 4 is constructed as a spherical surface, the cross-section of the airbag cavity 2 adapted thereto is constructed as a circle or an ellipse. In this way, even if the valve core 3 is subjected to air pressure after the airbag cavity 2 is inflated, after the pressure-bearing part 4 abuts against the airbag cavity 2, it is in a stable state. Of course, it is not excluded that it can also be in a stable state under the friction between the valve core 3 and the pressing sealing part, but the pressure-bearing part 4 does not abut against the airbag cavity 2.

[0025] When the present utility model is in use, the installation steps are as follows: First, place the strip-shaped sealing structure at the gap of the upper frame cover plate of the generator, and then apply an external force to the pressing part 11 to insert the sealing structure into the gap of the upper frame cover plate of the generator; then inflate and pressurize the airbag cavity 3 through the valve core 3 to expand the airbag cavity 2, so that the rubber material is sealed and fitted to the upper frame cover plate, that is, the installation is completed.

[0026] When disassembling, first open the valve core 3 to discharge the gas in the airbag cavity 2, so as to reduce the friction between the airbag cavity 2 and the upper frame cover plate of the generator, and then pull out the inflatable sealing structure.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A sealing structure for a hydro-generator set, characterized in that: It includes a press-sealing portion and an inflatable bag cavity integrally connected to the lower part of the press-sealing portion. The press-sealing portion and the inflatable bag cavity are both extended along the radial direction of the inflatable bag cavity to form a long strip shape. Both ends of the inflatable bag cavity are closed. A valve core is embedded in the press-sealing portion, and the valve core is used to inflate or deflate the inflatable bag cavity.

2. A sealing structure for a hydro-generator set according to claim 1, characterized in that: The pressing and sealing portion comprises a pressing portion and a connecting portion, wherein the connecting portion is connected between the pressing portion and the inflatable bag cavity, and the cross section of the pressing portion is configured to be semicircular, semi-elliptical, rectangular or trapezoidal.

3. The sealing structure for a hydro-generator set according to claim 1, characterized in that: The cross section of the inflatable bladder cavity is configured to be circular, rectangular, trapezoidal, or elliptical.

4. A sealing structure for a hydro-generator set according to claim 3, characterized in that: The valve core extends into the airbag cavity, and a pressure-bearing portion is configured at the bottom end of the valve core, and the pressure-bearing portion is used to abut against the inner wall of the airbag cavity.

5. A sealing structure for a hydro-generator set according to claim 4, characterized in that: The outer wall surface of the pressure-bearing portion is configured to match the inner wall of the inflatable bag cavity, so that the top surface of the pressure-bearing portion fully abuts against the inner wall of the inflatable bag cavity after being pressurized when the inflatable bag cavity is inflated.

6. A sealing structure for a hydro-generator set according to claim 5, characterized in that: The top surface of the pressure-bearing portion is configured as a spherical surface.

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