CN217463198U - Sealing device for hydraulic pump of nuclear power station - Google Patents

Abstract

The utility model belongs to the technical field of the nuclear power station rotates the equipment maintenance engineering, concretely relates to a sealing device for nuclear power station hydraulic pump, the mar on the pump chamber inner wall can effectively be filled to graphite sealing ring among this sealing device by the extrusion back graphite of clamping ring, makes sealing performance greatly improve. In addition, the contact area between the outer cylindrical surface of the metal self-sealing ring and the shell is reduced by about half, the interaction force between the sealing ring and the pump shell is reduced, the difficulty in integrally removing the core cladding and the sealing ring is effectively reduced due to the lubricating effect of graphite, and the risk of scratching the inner wall of the pump shell is reduced.

Description

Sealing device for hydraulic pump of nuclear power station

Technical Field

The application belongs to the technical field of overhaul engineering of rotating equipment of a nuclear power station, and particularly relates to a sealing device for a hydraulic pump of the nuclear power station.

Background

A certain nuclear power plant unit is provided with a hydraulic pump which is driven by main feed water and is used for separating steam from condensed water generated after steam is detected by a heat pipe and heated, and the condensed water is conveyed to an inlet of a high-pressure heater so as to improve the heat efficiency of the unit.

The sealing ring of the main junction surface of the hydraulic pump is of a conical surface self-sealing structure, the material of the sealing ring is austenitic stainless steel, the conical surface of the sealing ring is matched with the conical surface of a core package, the outer circular surface of the sealing ring is matched with the inner wall of a pump shell, a pump large cover is installed on the sealing ring, and after the large cover is fastened through bolts, the sealing ring is compressed and tensioned to play a sealing role.

However, this seal design has two problems: firstly, the sealing ring can not be detached independently during maintenance and can only be lifted out together with the core package; secondly, because the outer right-angle side of sealing ring and the contact surface of pump casing are great, the cooperation is tight, when the whole pump casing that hangs out of seal ring and core package, very easily cause the inner wall fish tail of pump casing. After the inner wall of the pump shell is scratched, the original sealing performance is reduced, even the sealing is failed, and high-pressure steam is leaked. The leakage of high-pressure steam due to sealing failure can cause equipment unavailability, and the leakage of high-temperature and high-pressure steam has great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The application aims at providing a sealing device for nuclear power station hydraulic pump, and the sealing device solves the problems that the leakage of high-pressure steam can cause equipment to be unavailable, and the potential safety hazard is very large because the design problem and the dismounting difficulty and other factors lead to the sealing failure of the hydraulic pump.

The technical scheme for realizing the purpose of the application is as follows:

the embodiment of the application provides a sealing device for nuclear power station hydraulic pump, sealing device includes: a core wrap and a conical sealing ring;

the lower end of the conical sealing ring is of a conical structure and is combined with the conical surface at the upper end of the core bag; the conical sealing ring and the core package are both arranged inside a pump cavity of the hydraulic pump and are in contact with the inner wall of the pump cavity;

one side of the conical sealing ring, which is in contact with the inner wall of the pump cavity, is provided with a sealing structure which can be deformed by extrusion and is used for realizing tight sealing between the conical sealing ring and the inner wall of the pump cavity.

Alternatively to this, the first and second parts may,

the sealing structure is also used for realizing the lubrication between the conical sealing ring and the inner wall of the pump cavity.

Optionally, the sealing structure includes: a second seal ring;

an annular groove is formed in the upper end of the conical sealing ring, and one side of the annular groove is communicated with the inner wall of a pump cavity of the hydraulic pump;

and the second sealing ring is arranged in the annular groove and can be extruded to deform.

In the alternative,

the second sealing ring is specifically a graphite sealing ring.

Optionally, the sealing device further includes: pressing a ring;

and the compression ring is arranged at the upper end of the second sealing ring and used for compressing the second sealing ring.

In the alternative,

the lower end of the pressure ring is in contact with the second sealing ring;

the upper end of the pressure ring is in contact with a boss at the lower part of a large cover of the hydraulic pump; and the lower boss of the large cover compresses the compression ring.

Alternatively to this, the first and second parts may,

the compression ratio of the graphite sealing ring is not less than the packing sealing standard.

The beneficial technical effect of this application lies in:

(1) the embodiment of the application provides a sealing device for a hydraulic pump of a nuclear power station, which is simple in structure, effectively solves the problem that the original metal self-sealing ring cannot be normally detached by utilizing a graphite sealing ring, effectively solves the problem that the sealing performance of a conical stainless steel self-sealing ring of the hydraulic pump is reduced, is convenient to detach compared with a front sealing ring, and improves the maintenance work efficiency;

(2) the embodiment of the application provides a sealing device for nuclear power station hydraulic pump, utilizes graphite sealing ring effectively to reduce the risk of sealing ring and pump case inner wall fitting surface fish tail, after sealing ring and pump case inner wall fitting surface fish tail, still can guarantee sealing performance.

Drawings

Fig. 1 is a schematic structural diagram of a sealing device for a hydraulic pump of a nuclear power plant;

fig. 2 is a schematic structural diagram of a sealing device for a hydraulic pump of a nuclear power plant according to an embodiment of the present application.

In the figure:

11-a sealing ring; 12-a core package; 13-a pump housing; 14-pump big cover;

21-a conical sealing ring; 22-a second sealing ring; 23-pressure ring.

Detailed Description

In order to make the technical solutions in the embodiments of the present application more clearly understood and fully described below by those skilled in the art, the technical solutions in the embodiments of the present application will be described with reference to the drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present application.

The inventor of the application finds in research that, as shown in fig. 1, in the existing sealing device for the hydraulic pump of the nuclear power station, the sealing ring 11 is of a conical surface self-sealing structure and made of austenitic stainless steel, the conical surface of the sealing ring 1 is matched with the conical surface of the core package 12, the outer circular surface of the sealing ring 11 is matched with the inner wall of the pump shell 13, the pump big cover 14 is installed on the sealing ring 11, and the sealing ring 11 is compressed and tensioned to play a sealing role after the pump big cover 14 is fastened by bolts. However, the matching surface between the outer cylindrical surface of the original sealing ring 11 and the inner wall of the pump housing 13 is very easy to scratch, and the scratch on the inner wall of the pump housing 13 is not easy to be completely repaired, so that the sealing performance of the pump is reduced.

Therefore, the embodiment of the application provides a sealing device for a hydraulic pump of a nuclear power station, and graphite in the sealing device can effectively fill scratches on the inner wall of a pump cavity after a graphite sealing ring is extruded by a pressing ring, so that the sealing performance is greatly improved. In addition, the contact area between the outer cylindrical surface of the metal self-sealing ring and the shell is reduced by about half, the interaction force between the sealing ring and the pump shell is reduced, the difficulty in integrally removing the core cladding and the sealing ring is effectively reduced due to the lubricating effect of graphite, and the risk of scratching the inner wall of the pump shell is reduced.

Based on the above, in order to clearly and specifically explain the above advantages of the present application, the following description of the embodiments of the present application will be made with reference to the accompanying drawings.

Referring to fig. 2, the drawing is a schematic structural diagram of a sealing device for a hydraulic pump of a nuclear power plant according to an embodiment of the present application.

The sealing device for the hydraulic pump of the nuclear power station provided by the embodiment of the application comprises: a core pack (not shown in the drawings) and a conical sealing ring 21;

the lower end of the conical sealing ring 21 is of a conical structure and is combined with the conical surface of the upper end of the core bag; the conical sealing ring 21 and the core package are both arranged inside a pump cavity of the hydraulic pump and are in contact with the inner wall of the pump cavity;

one side of the conical sealing ring 21, which is in contact with the inner wall of the pump cavity, is provided with a sealing structure which can be extruded and deformed, and the sealing structure is used for realizing tight sealing between the conical sealing ring 21 and the inner wall of the pump cavity.

In some possible implementations of the embodiment of the present application, the sealing structure is further used for achieving lubrication between the conical sealing ring 21 and the inner wall of the pump cavity.

As an example, the sealing structure specifically includes: a second seal ring 22;

the upper end of the conical sealing ring 21 is provided with an annular groove, and one side of the annular groove is communicated with the inner wall of a pump cavity of the hydraulic pump;

and a second sealing ring 22 is arranged in the annular groove, and the second sealing ring 22 can be extruded to generate deformation.

In one example, the second seal ring 22 is embodied as a graphite seal ring. In practical application, the compression ratio of the graphite sealing ring is not less than the packing sealing standard, so that a good sealing effect is achieved.

It should be noted that, after the graphite sealing ring is pressed by the press ring, scratches on the inner wall of the pump cavity 2 can be effectively filled with graphite, so that the sealing performance is greatly improved. In addition, the contact area between the outer cylindrical surface of the conical sealing ring 21 and the inner wall of the pump cavity is reduced by about half compared with the existing design, the interaction force between the conical sealing ring 21 and the inner wall of the pump cavity is reduced, the difficulty of integrally removing the core cladding and the conical sealing ring 21 is effectively reduced by adding the lubricating effect of graphite, and the risk of scratching the inner wall of the pump cavity is reduced.

In some possible implementation manners of the embodiment of the present application, the sealing device may further include: a pressure ring 23;

a pressing ring 23 is installed at an upper end of the second sealing ring 22 for pressing the second sealing ring 22.

As an example, the lower end of the pressing ring 23 is in contact with the second seal ring 22;

the upper end of the press ring 23 is contacted with a boss at the lower part of the large cover of the hydraulic pump; the lower boss of the large cover compresses the press ring 23.

The following describes a specific installation method of a sealing device for a hydraulic pump of a nuclear power plant according to an embodiment of the present application in detail with reference to a specific example.

The mounting method specifically comprises the following steps:

(1) turning the original sealing ring 11 according to the requirements of a drawing to form an annular groove to obtain a conical sealing ring 21;

(2) polishing scratches and burrs on the inner wall of a pump cavity 22 of the hydraulic pump, and cleaning;

(3) assembling the core package into the pump cavity as required by the maintenance procedure;

(4) the conical sealing ring 21 is installed, and the conical sealing ring 21 is matched with the conical surface of the core package;

(5) mounting the second seal ring 22 into the annular groove of the machined conical seal ring 21;

(6) mounting a press ring 23 on an upper portion of the conical seal ring 21;

(7) and (3) mounting the large cover on the pump cavity, compressing the compression ring 23 by using a boss at the lower part of the large cover, and finally symmetrically fastening bolts of the large cover according to the torque requirement.

In the sealing device for the hydraulic pump of the nuclear power station, the graphite sealing gasket is extruded through the compression ring, scratches on the inner wall of the pump cavity can be perfectly filled with graphite, and the sealing effect is greatly improved. In addition, in the sealing device, the contact area between the outer cylindrical surface of the metal self-sealing ring and the shell is reduced by about half, the interaction force between the sealing ring and the pump shell is reduced, the difficulty in integrally removing the core cladding and the sealing ring is effectively reduced due to the lubricating effect of graphite, and the risk of scratching the inner wall of the pump shell is reduced.

The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the matters not described in detail in this application.

Claims (7)

1. A seal for a hydraulic pump of a nuclear power plant, characterized in that it comprises: a core wrap and a conical sealing ring;

the lower end of the conical sealing ring is of a conical structure and is combined with the conical surface at the upper end of the core bag; the conical sealing ring and the core package are both arranged inside a pump cavity of the hydraulic pump and are in contact with the inner wall of the pump cavity;

one side of the conical sealing ring, which is in contact with the inner wall of the pump cavity, is provided with a sealing structure which can be deformed by extrusion and is used for realizing tight sealing between the conical sealing ring and the inner wall of the pump cavity.

2. Sealing device for nuclear power plant hydraulic pumps, according to claim 1,

the sealing structure is also used for realizing the lubrication between the conical sealing ring and the inner wall of the pump cavity.

3. The seal arrangement for a nuclear power plant hydraulic pump as defined in claim 2, wherein the seal arrangement comprises: a second seal ring;

an annular groove is formed in the upper end of the conical sealing ring, and one side of the annular groove is communicated with the inner wall of a pump cavity of the hydraulic pump;

and the second sealing ring is arranged in the annular groove and can be extruded to deform.

4. Sealing device for a hydraulic pump in nuclear power plants according to claim 3,

the second sealing ring is specifically a graphite sealing ring.

5. The seal arrangement for a nuclear power plant hydraulic pump according to claim 3 or 4, characterized in that it further comprises: pressing a ring;

and the compression ring is arranged at the upper end of the second sealing ring and used for compressing the second sealing ring.

6. Sealing device for a hydraulic pump in nuclear power plants according to claim 5,

the lower end of the pressure ring is in contact with the second sealing ring;

the upper end of the pressure ring is in contact with a boss at the lower part of a large cover of the hydraulic pump; and the lower boss of the large cover compresses the compression ring.

7. Sealing device for a hydraulic pump in nuclear power plants according to claim 4,

the compression ratio of the graphite sealing ring is not less than the packing sealing standard.

Images