CN217735644U

CN217735644U - Sealing structure of volute drainage device of water turbine

Info

Publication number: CN217735644U
Application number: CN202221798844.1U
Authority: CN
Inventors: 胡小刚
Original assignee: Chongqing Datang International Wulong Hydropower Development Co Ltd
Current assignee: Chongqing Datang International Wulong Hydropower Development Co Ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-11-04
Anticipated expiration: 2032-07-13

Abstract

The utility model discloses a hydraulic turbine spiral case drainage device seal structure, including disk seat (1), seal receptacle (2), valving, the spiral case, disk seat (1) is connected with the drainage steel pipe, and the steel pipe stretches into the tail water room and is connected with the spiral case again, and disk seat (1) internally mounted has seal receptacle (2), and seal receptacle (2) and disk seat (1) carry out closing, are equipped with seal assembly to closing the face, prevent to leak, and valving includes valve disc (3) and valve rod (4) that link to each other rather than, sets up seal assembly between valve disc (3) and seal receptacle (2) contact surface. The utility model provides an among the prior art seal structure be damaged by the shearing force easily and lead to the problem of hourglass water and metal cavitation, just the utility model discloses a seal structure is difficult to damage, and the stagnant water is effectual, can also be to a certain extent protection device extension machine life.

Description

Sealing structure of volute drainage device of water turbine

Technical Field

The utility model relates to a spiral case of the hydraulic turbine, concretely relates to spiral case drainage device seal structure of hydraulic turbine.

Background

The hydraulic turbine is a power machine for converting the energy of water flow into rotary mechanical energy, and belongs to the turbine machinery in fluid machinery. Modern water turbines are mostly installed in hydropower stations and are used for driving generators to generate electricity. In a hydropower station, water in an upstream reservoir is guided to a water turbine through a water guide pipe to push a water turbine runner to rotate so as to drive a generator to generate electricity. The water after doing work is discharged to the downstream through the tail water pipeline. The higher the water head and the larger the flow, the larger the output power of the water turbine is.

Various types of reaction water turbines are provided with water inlet devices, and the water inlet devices of large and medium-sized vertical shaft reaction water turbines generally comprise a volute, fixed guide vanes and movable guide vanes. The function of the volute is to distribute the water flow evenly around the rotating wheel. When the water head is below 40 m, the volute of the water turbine is formed by casting reinforced concrete on site; when the water head is higher than 40 m, a tailor welded or integrally cast metal volute is usually adopted. The volute is a volute type water diversion chamber for short, the shape of the volute is similar to that of a snail shell, and therefore the volute is usually called the volute for short. The volute of the water turbine contains a large amount of pressure water, so as to ensure uniform water supply to the water guide mechanism, the section of the volute is gradually reduced, and simultaneously, the volute can form necessary annular quantity in front of the water guide mechanism to reduce the working strength of the water guide mechanism. When the set is in operation, a large amount of water is stored in the volute to push the rotating wheel of the water turbine to rotate to do work. When the hydraulic turbine needs to be overhauled, the volute casing is drained: the hydroelectric generating set is shut down, the upstream gate is closed, the downstream gate is closed, and the volute drainage device is opened to discharge water in the volute into the downstream, so that the maintenance work of the water turbine is facilitated.

When the volute drainage device in the prior art is started, a servomotor limiting device needs to be loosened, the action of a servomotor is realized by additionally adding an oil pump to supply oil, a valve rod is driven, a valve disc of a valve device is welded at the upper part of the valve rod, and the valve is started to discharge water in the volute into a tail water pipe through a steel pipe; when the unit operates, the valve device is locked at a full-closed position by a servomotor through a nut of a limiting device, as shown in figure 1, a triangular sealing ring 11 on a valve drainage device is contacted with a valve seat 1, the triangular rubber sealing ring 11 is fixed on the drainage valve disc 3 through 12 cylindrical pins 5 with the diameter of 6mm uniformly distributed on the valve disc 3, and the triangular rubber sealing ring 11 and the cylindrical pins 5 are rubbed and extruded by the closing force of the drainage valve to deform so as to achieve the purpose of sealing and preventing water leakage. This triangle-shaped rubber seal ring 11 is rubber machinery lathe work, required preparation technology is higher, and material processing manufacturing cost is expensive, triangle-shaped rubber seal ring 11 and cylindric lock 5 all can produce shearing force extrusion cutting when switching drainage device at every turn, easily make triangle-shaped rubber seal ring 11 deformation damage, this triangle-shaped rubber seal ring 11 easily receives aquatic silt rubbish to rush when drainage device opens in addition, frequently take place to damage by water impact, cause rivers to flow away from the seal clearance, greatly waste water resource, also easily cause here metal cavitation, if need encircle more sealing strip and need on-the-spot drilling, install the locating pin again, waste a large amount of manpower and financial resources, and sealed also very easily damage after the change.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a spiral case drainage device seal structure is provided, can prevent that seal structure from leading to leaking and metal cavitation because shearing force action frequently damages, this seal structure is not fragile, and the stagnant water is effectual.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides a hydraulic turbine spiral case drainage device seal structure, includes disk seat, seal receptacle, valve gear, spiral case, and the disk seat is connected with the drainage steel pipe, and the steel pipe stretches into the tail water room and is connected with the spiral case again, and disk seat internally mounted has the seal receptacle, and seal receptacle and disk seat carry out closing, are equipped with sealing member to closing the face, prevent to leak. The valve device comprises a valve rod connected with a valve disc, and the valve disc is contacted with a sealing seat.

Preferably, the sealing seat and the valve seat are fixed by uniformly distributed 12M 24X60 hexagon socket head cap screws;

preferably, the sealing seat and the valve seat are provided with a first O-shaped sealing strip of a sealing component on the combining surface, and the first O-shaped sealing strip is used for preventing water leakage at the shaft seat;

preferably, the first O-shaped sealing strip is placed in a groove of a sealing seat and a valve seat matching surface, one part of the first O-shaped sealing strip is positioned in the groove, the other part of the first O-shaped sealing strip is positioned outside the groove, and the structure forms sealing through extrusion deformation;

preferably, the sealing component of the contact surface of the valve disc and the sealing seat is a second O-shaped sealing strip;

preferably, a groove is formed in the surface, which is in contact with the sealing seat, of the valve disc, and is used for placing a second O-shaped sealing strip;

preferably, the second O-shaped sealing strip is fixed through the combined action of the valve disc, the pressing ring and the screw;

preferably, grooves are respectively arranged on the valve disc and the sealing seat and used for placing a second O-shaped sealing strip;

preferably, the second O-shaped sealing strip is fixed through the combined action of the valve disc, the sealing seat, the pressing ring and the screw;

preferably, a part of the second O-shaped sealing strip is located in the groove, and a part of the second O-shaped sealing strip is located outside the groove, so that the sealing effect is achieved through extrusion deformation.

The utility model provides a pair of hydraulic turbine spiral case drainage device seal structure has following beneficial effect:

(1) Through setting up reasonable seal structure, solved prior art's seal structure and easily receive the shearing force damage to lead to leaking and the problem of metal cavitation, can also save water resource and cost of labor.

(2) The contact area between the O-shaped sealing strip and the plane is small, the generated friction force is small, most of the stress is extrusion force, so the shearing force is small, and the sealing strip is not easy to damage;

(3) The O-shaped strips are consistent in diameter and length at any position, coaxiality of the valve disc and the valve device can be better guaranteed when the O-shaped strips are installed in the grooves, the device can be protected to a certain degree, and service life of a machine is prolonged.

The foregoing is only an overview of the embodiments of the present invention, and in order to make the technical means of the embodiments of the present invention more clearly understood, the embodiments of the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features and advantages of the embodiments of the present invention more obvious and understandable, the following detailed description of the embodiments of the present invention is given.

Drawings

FIG. 1 is a valve seal structure view of a water turbine volute drainage device in the prior art;

fig. 2 is a schematic view of the sealing structure of the spiral casing drainage device of the water turbine of the present invention;

FIG. 3 is a view showing a valve seal structure of a drainage device in accordance with embodiment 1 of the present invention;

fig. 4 is a valve seal structure diagram of a drainage device in embodiment 2 of the invention;

the reference numbers in the figures illustrate: the sealing device comprises a valve seat-1, a sealing seat-2, a valve disc-3, a valve rod-4, a cylindrical pin-5, an inner hexagonal cylindrical head screw-6, a first O-shaped sealing strip-7, a second O-shaped sealing strip-8, a pressing ring-9, a countersunk head screw-10 and a triangular rubber sealing ring-11.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention. The term "coupled", unless expressly stated or limited otherwise, is to be construed broadly, e.g., "coupled" may be a fixed connection or a removable connection or as an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Example 1: as shown in fig. 2 and fig. 3, the lower part of the valve seat 1 is welded with a steel pipe for draining water, a sealing seat 2 is arranged inside the valve seat 1, the sealing seat 2 and the valve seat 3 are fixed by uniformly distributed 12M 24X60 hexagon socket head cap screws 6 and closed, a groove is formed in the contact surface of the sealing seat 2 and the valve seat 3, a first O-shaped sealing strip 7 with the diameter of 6mm is arranged in the groove, when the sealing seat 2 and the valve seat 3 are fixed and pressed by the uniformly distributed 12M 24X60 hexagon socket head cap screws 6, the generated force extrudes the first O-shaped sealing strip 7, the first O-shaped sealing strip 7 is extruded and deformed, and sealing is formed between the sealing seat 2 and the valve seat 3. The valve device comprises a valve disc 3 and a valve rod 4 welded with a welding disc 3, wherein the valve rod 4 acts through a servomotor connected with the lower part of the valve rod. A groove is formed in the contact position of the valve disc 3 and the sealing seat 2, a second O-shaped rubber sealing strip 8 with the diameter of 16mm is arranged in the groove and serves as a sealing component, the diameter of the groove is matched with that of the second O-shaped rubber sealing strip 8, and the second O-shaped rubber sealing strip 8 is fixed on the valve disc through the valve disc 3, the pressing ring 9 and 12M 16 countersunk screws 10 uniformly distributed on the pressing ring. When the volute drainage device is started, the valve disc 3 is pushed outwards, and water in the volute is drained into the tail water pipe through the steel pipe; when the unit is operated, the drainage device is in a closed state, the valve disc 3 is locked and tightly pressed at a full-closed position by the nut of the limiting device, a sealing state is formed between the valve disc 3 and the sealing seat 2 at the moment, the second O-shaped sealing strip 8 has certain elasticity, a formed sealing space also has certain compression amount, and the normal performance of the machine can be ensured under the condition that a little error exists when the valve disc 3 is inwards pressed and closed.

Example 2: as shown in fig. 2 and 4, the lower part of the valve seat 1 is welded with a steel pipe for draining water, a sealing seat 2 is arranged inside the valve seat 1, the sealing seat 2 and the valve seat 3 are fixed by uniformly distributed 12M 24X60 hexagon socket head cap screws 6 and closed, a groove is formed in the contact surface of the sealing seat 2 and the valve seat 3, a first O-shaped sealing strip 7 with the diameter of 6mm is arranged in the groove, and when the sealing seat 2 and the valve seat 3 are fixed and pressed by the uniformly distributed 12M 24X60 hexagon socket head cap screws 6, the generated force extrudes the first O-shaped sealing strip 7, so that the first O-shaped sealing strip 7 is extruded and deformed, and sealing is formed between the sealing seat 2 and the valve seat 3. The valve device comprises a valve disc 3 and a valve rod 4 welded with a welding disc 3, wherein the valve rod 4 acts through a servomotor connected with the lower part of the valve rod. At the contact position of the valve disc 3 and the seal seat 2, a groove is respectively arranged on the valve disc 3 and the seal seat 2, a second O-shaped rubber sealing strip 8 is respectively arranged in the groove to be used as a sealing component, the diameter of the groove is matched with that of the second O-shaped rubber sealing strip 8, and the second O-shaped rubber sealing strip 8 is respectively fixed on the valve disc and the seal seat through countersunk screws 10 uniformly distributed on the valve disc 3, the pressure ring 9 and the pressure ring. When the volute drainage device is opened, the valve disc 3 is pushed outwards, and water in the volute is drained into the tail water pipe through the steel pipe; when the unit operation, drainage device is in the closed condition, and valve disc 3 is locked tightly by the stop device nut and is being closed the position entirely, and the second O shape sealing strip 8 between valve disc 3 and seal receptacle 2 receives the extrusion to produce deformation this moment, and two sealing strips receive the extrusion to produce deformation and make sealed effect better, and when damage appears in one of them, machine normal behavior also can be guaranteed to another sealing strip.

The compression ring selected by the embodiment is a metal compression ring, and can be made of stainless steel or Q235 steel; the groove of the sealing strip can be adaptively adjusted in position, size and shape according to different actual conditions; the shape, size, material, etc. of the sealing strip can also be changed according to the requirement.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a hydraulic turbine spiral case drainage device seal structure, including disk seat (1), seal receptacle (2), valving, the spiral case, disk seat (1) is connected with the drainage steel pipe, the steel pipe stretches into the tail water room and is connected with the spiral case again, disk seat (1) internally mounted has seal receptacle (2), seal receptacle (2) and disk seat (1) carry out closing, valving includes valve rod (4) that valve disc (3) link to each other rather than, valve disc (3) and seal receptacle (2) contact, a serial communication port, valve disc (3) are equipped with seal part with seal receptacle (2) contact surface, prevent to leak.

2. The sealing structure of the volute casing drainage device of the water turbine according to claim 1, wherein the sealing seat (2) and the valve seat (1) are fixed and fastened by screws.

3. The sealing structure of the water turbine volute casing drainage device according to claim 1, wherein the sealing seat (2) and the valve seat (1) are provided with a first O-shaped sealing strip (7) for preventing water leakage at the shaft seat.

4. The sealing structure of the volute casing drainage device of the water turbine as claimed in claim 3, wherein the first O-shaped sealing strip (7) is placed in a groove of the sealing seat (2) and the valve seat (1) facing surface, one part is positioned in the groove, the other part is positioned outside the groove, and the structure is sealed by extrusion deformation.

5. The sealing structure of the volute casing drainage device of the water turbine according to claim 1, wherein the sealing component of the contact surface of the valve disc (3) and the sealing seat (2) is a second O-shaped sealing strip (8).

6. The sealing structure of the volute casing drainage device of the water turbine according to claim 5, wherein a groove is formed on the surface of the valve disc (3) contacting with the sealing seat (2) for placing the second O-shaped sealing strip (8).

7. The sealing structure of the volute casing drainage device of the water turbine as claimed in claim 6, wherein the second O-shaped sealing strip (8) is fixed by the combined action of the valve disc (3), the pressing ring (9) and the screw (10).

8. The sealing structure of the volute casing drainage device of the water turbine as claimed in claim 5, wherein grooves are respectively formed on the valve disc (3) and the sealing seat (2) for placing the second O-shaped sealing strip (8).

9. The sealing structure of the water turbine volute casing drainage device according to claim 8, wherein the second O-shaped sealing strip (8) is fixed by the combined action of the valve disc (3), the sealing seat (2), the pressure ring (9) and the screw (10).

10. The sealing structure of the water turbine volute drainage device according to claim 5, wherein the second O-shaped sealing strip (8) is partially arranged in the groove and partially arranged outside the groove, and achieves a sealing effect through extrusion deformation.