CN213929434U

CN213929434U - Medium-pressure regulating valve mechanical sealing device for nuclear power station

Info

Publication number: CN213929434U
Application number: CN202023115002.5U
Authority: CN
Inventors: 李志山; 刘婷; 向前
Original assignee: Zhongmi Holding Co ltd
Current assignee: Zhongmi Holding Co ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-08-10
Anticipated expiration: 2030-12-22

Abstract

The utility model relates to a mechanical seal technical field, especially a middling pressure governing valve mechanical seal device for nuclear power station, including cavity, floating seal subassembly and gland, the cavity is fixed in the casing, and is a plurality of floating seal subassembly pile up install in between cavity and the valve rod, the gland is fixed on the terminal surface of cavity, the gland will floating seal subassembly compress tightly in the cavity. The utility model has the advantages that: the cavity is arranged on the inner side of the shell, the plurality of overlapped floating seal assemblies are arranged in the cavity, and the floating seal assemblies are pressed tightly through the pressing cover, so that the plurality of floating seal assemblies form multi-stage seal, the valve body can be effectively isolated from the atmosphere side, and the sealing effect is good; when the valve rod is operated, the floating sealing assembly does not obstruct the rotation of the valve rod, and the opening of the valve is adjusted quickly and accurately.

Description

Medium-pressure regulating valve mechanical sealing device for nuclear power station

Technical Field

The utility model relates to a mechanical seal device technical field, especially a middling pressure governing valve mechanical seal device for nuclear power station.

Background

The regulating valve is also called a control valve, and in the field of industrial automation process control, the final control element for changing the process parameters of medium flow, pressure, temperature, liquid level and the like by power operation through receiving the control signal output by a regulating control unit.

In the equipment of the nuclear power plant, the nuclear power regulating valve plays an extremely important role in normal, safe and reliable operation of the nuclear power plant, so that the requirements on the reliability, adaptability, stability and sealing performance of the nuclear power regulating valve are higher and higher. The medium pressure regulating valve is a common valve in nuclear power plant equipment, the medium pressure range of the medium pressure regulating valve is 1-2 MPa, when the valve is regulated, the valve rod and the shell rotate relatively, medium in the valve is easy to leak to the atmosphere side from a gap between the shell and the valve rod, and the medium is not allowed in the operation of the nuclear power plant equipment. Meanwhile, the valve is required to be capable of adjusting the opening degree of the valve rapidly and accurately when being adjusted.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's shortcoming, provide a middling pressure governing valve mechanical seal device for nuclear power station.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a nuclear power station is with middling pressure governing valve mechanical seal device, includes cavity, floating seal subassembly and gland, the cavity is fixed in the casing, and is a plurality of floating seal subassembly pile up install in between cavity and the valve rod, the gland is fixed on the terminal surface of cavity, the gland will floating seal subassembly compress tightly in the cavity.

Further, the floating seal assembly comprises a floating ring seat and a split ring, the floating ring seat is of a cylindrical structure with a step cavity, the inner surfaces of the floating ring seat and the cavity are in clearance fit, the split ring is floatingly mounted in the floating ring seat, and a clearance is reserved between the split ring seat and the valve rod.

Furthermore, an elastic supporting seat is fixed in a step cavity of the floating ring seat, an elastic piece is arranged in the elastic supporting seat, and the elastic piece is supported on the lower surface of the split ring.

Furthermore, the split ring comprises three split bodies and two extension springs, the three split bodies are sequentially connected in a staggered manner to form a whole circle, two spring grooves are formed in the outer wall of each split body respectively, and the extension springs are installed in the corresponding spring grooves after the three split bodies are connected in the staggered manner.

Furthermore, the inner wall of the cavity is provided with a plurality of stages of annular steps, and the outer diameter of the floating ring seat is matched with the inner diameter of the corresponding position of the cavity.

Furthermore, a spacer ring is arranged below each stage of the annular step, the upper end surface of the spacer ring is abutted against the lower surface of the floating sealing assembly above the spacer ring, and the lower end surface of the spacer ring is abutted against the upper surface of the floating sealing assembly below the spacer ring.

Further, the inner diameter of the spacer ring is larger than the diameter of the valve rod.

Furthermore, a through hole is formed in the spacer ring along the radial direction of the spacer ring, the inner wall of the spacer ring, the outer wall of the valve rod and the floating seal assemblies at the upper end and the lower end of the spacer ring are enclosed to form a leakage cavity, an air pumping hole is correspondingly formed in the shell, and the air pumping hole is communicated with the leakage cavity through the through hole.

Further, an adjusting ring is arranged between the gland and the outermost floating sealing assembly.

Further, the lower surface of the adjusting ring is coated with a wear-resistant layer, and the wear-resistant layer is abutted to the split ring below the wear-resistant layer.

The utility model has the advantages of it is following:

1. the utility model discloses a set up the cavity in the casing inboard, a plurality of unsteady seal assembly that overlap and set up of installation in the cavity compress tightly unsteady seal assembly through the gland again, and a plurality of unsteady seal assembly have formed the multistage seal, can keep apart with the atmosphere side in the valve body effectively, and it is sealed effectual.

2. The utility model discloses a floating seal subassembly adopts the branch valve ring of floating installation in the floating ring seat, divides the valve ring to be the graphite ring, has good wear-resisting, corrosion resisting property, and long service life divides gappedly between valve ring and the valve rod moreover, and when adjusting the valve opening, the action is quick, accurate.

3. The utility model discloses a cavity adopts multistage cyclic annular step, and is more convenient, swift when the installation seal assembly that floats.

4. Set up the spacer ring between two floating seal subassemblies to form a leakage cavity with the valve rod, even if there is a little medium leakage, can concentrate on in this leakage cavity, the rethread extraction opening is taken the medium out, realizes carrying out effective management and control to the medium that leaks out, prevents that the medium from directly leaking to the atmosphere side.

Drawings

Fig. 1 is a cross-sectional view of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 is a schematic structural view of the split ring of the present invention;

fig. 4 is a schematic structural view of the segment of the present invention;

fig. 5 is a schematic structural diagram of an adjusting ring according to the present invention;

in the figure: 1-valve rod, 2-shell, 3-cavity, 4-floating sealing component, 5-gland, 6-adjusting ring, 7-spacer ring, 8-pumping hole, 9-floating ring seat, 10-valve separating ring, 11-elastic supporting seat, 12-elastic piece, 13-tension spring, 15-valve separating body and 16-wear-resistant layer.

Detailed Description

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following description.

As shown in fig. 1, a mechanical seal device for a medium pressure regulating valve for a nuclear power station comprises a cavity 3, floating seal assemblies 4 and a gland 5, wherein the cavity 3 is fixed in a shell 2, in the embodiment, the cavity 3 has an edge extending to the outside and is fixed on the end surface of the shell 2 through screws, a plurality of floating seal assemblies 4 are stacked and installed between the cavity 3 and a valve rod 1, the gland 5 is fixed on the end surface of the cavity 3, and the floating seal assemblies 4 are compressed in the cavity 3 through the gland 5. The floating seal assemblies 4 can ensure that media in the valve are not leaked to the atmosphere side, and can also ensure that the valve rod 1 is flexible to operate and is not blocked, so that the normal operation of equipment is ensured.

Further, as shown in fig. 2, the floating seal assembly 4 includes a floating ring seat 9 and a split ring 10, the floating ring seat 9 is a cylindrical structure with a stepped cavity, and a clearance fit is formed between the floating ring seat 9 and the inner surface of the cavity 3, the split ring 10 is floatingly installed in the floating ring seat 9, and a clearance is left between the split ring 10 and the valve stem 1. The split ring 10 can float up and down relative to the floating ring seat 9,

furthermore, an elastic support seat 11 is fixed in a step cavity of the floating ring seat 9, an elastic member 12 is installed in the elastic support seat 11, and the elastic member 12 is supported on the lower surface of the split ring 10. In this embodiment, the elastic member 12 is a disc spring. Of course, instead of using a disc spring as the elastic member, other elastic members such as a spring, an elastic pad, etc. may be used.

Further, as shown in fig. 3 and 4, the split ring 10 is composed of three split bodies 14 and two tension springs 13, the three split bodies 14 are sequentially connected in a staggered manner and form a whole circle, two spring grooves are respectively formed on the outer wall of each split body 14, and the tension springs 13 are installed in the corresponding spring grooves after the three split bodies 14 are connected in a staggered manner. The tension spring 13 holds the three split bodies 14 tightly to form an integral structure, so that a whole ring is formed, and the installation difficulty can be reduced. In this embodiment, the valve separating ring 10 is a graphite ring, which has good wear resistance and corrosion resistance, and a long service life, and a gap is formed between the valve separating ring 10 and the valve rod 1, so that the valve separating ring can move quickly and accurately when the opening of the valve is adjusted.

Further, referring to fig. 1, a plurality of stages of annular steps are disposed on the inner wall of the cavity 3, and the outer diameter of the floating ring seat 9 is adapted to the inner diameter of the corresponding position of the cavity 3, so that the floating seal assembly 4 is more convenient and faster to mount.

Further, with reference to fig. 1, a spacer ring 7 is disposed below each stage of the annular step, an upper end surface of the spacer ring 7 abuts against a lower surface of the floating seal assembly 4 above the spacer ring 7, and a lower end surface of the spacer ring 7 abuts against an upper surface of the floating seal assembly 4 below the spacer ring 7. The surfaces of the floating ring seat 9 and the spacer ring 7 are coated with wear resistant layers to ensure that their respective thicknesses are kept almost constant during mutual rotation.

Further, the inner diameter of the spacer ring 7 is larger than the diameter of the valve stem 1. Therefore, the through hole has been seted up along its radially on the spacer ring 7, the inner wall of spacer ring 7, the outer wall of valve rod 1 and the floating seal assembly 4 at both ends enclose to close and form a leakage cavity about the spacer ring 7, the extraction opening 8 has been seted up to the correspondence on the casing 2, extraction opening 8 passes through the through-hole and leaks the cavity intercommunication, even if there is a little medium to leak, can concentrate in this leakage cavity, rethread extraction opening 8 takes the medium out, the realization is effectively managed and controlled the medium that leaks out, prevent that the medium from directly leaking to the atmosphere side.

Further, with continued reference to fig. 1, an adjustment ring 6 is disposed between the gland 5 and the outermost floating seal assembly 4. The thickness of the adjusting ring 6 is chosen to ensure that the floating seal assemblies 4 are pressed against each other, depending on the actual operating conditions. The adjusting ring 6 is repaired according to the assembling condition, and the compression amount of the sealing gasket is ensured.

Further, as shown in fig. 5, the lower surface of the adjustment ring 6 is coated with a wear-resistant layer 15, and the wear-resistant layer 15 abuts against the sub-valve ring 10 therebelow. When the valve rod 1 is rotated, the split ring 10 may rotate along with the valve rod 1, so mutual friction may be generated between the adjusting ring 6 and the split ring 10, and the thickness of the adjusting ring 6 is kept unchanged by arranging the wear-resistant layer 15.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a middling pressure governing valve mechanical seal device for nuclear power station which characterized in that: the floating seal assembly is fixed in the shell, the floating seal assembly is stacked and installed between the cavity and the valve rod, the gland is fixed on the end face of the cavity, and the floating seal assembly is tightly pressed in the cavity through the gland.

2. The mechanical sealing device for the medium pressure regulating valve for the nuclear power plant as claimed in claim 1, wherein: the floating seal assembly comprises a floating ring seat and a split ring, the floating ring seat is of a cylindrical structure with a step cavity, the inner surfaces of the floating ring seat and the cavity are in clearance fit, the split ring is floatingly installed in the floating ring seat, and a clearance is reserved between the split ring seat and the valve rod.

3. The mechanical sealing device for the medium pressure regulating valve for the nuclear power plant as claimed in claim 2, wherein: an elastic supporting seat is fixed in a step cavity of the floating ring seat, an elastic piece is arranged in the elastic supporting seat, and the elastic piece is supported on the lower surface of the split ring.

4. A medium pressure regulating valve mechanical seal device for a nuclear power plant as claimed in claim 2 or 3, wherein: the split ring comprises three split bodies and two extension springs, the three split bodies are sequentially connected in a staggered mode to form a whole circle, two spring grooves are formed in the outer wall of each split body respectively, and the extension springs are installed in the corresponding spring grooves after the three split bodies are connected in the staggered mode.

5. The mechanical sealing device for the medium pressure regulating valve for the nuclear power plant as claimed in claim 2, wherein: the inner wall of the cavity is provided with a plurality of stages of annular steps, and the outer diameter of the floating ring seat is matched with the inner diameter of the corresponding position of the cavity.

6. The mechanical sealing device for the medium pressure regulating valve for the nuclear power plant as set forth in claim 5, wherein: and a spacer ring is arranged below each stage of the annular step, the upper end surface of the spacer ring is abutted against the lower surface of the floating seal assembly above the spacer ring, and the lower end surface of the spacer ring is abutted against the upper surface of the floating seal assembly below the spacer ring.

7. The mechanical sealing device for the medium pressure regulating valve for the nuclear power plant as set forth in claim 6, wherein: the inner diameter of the spacer ring is larger than the diameter of the valve rod.

8. The mechanical sealing device for the medium pressure regulating valve for the nuclear power plant as claimed in claim 7, wherein: the device comprises a shell, a spacer ring, a valve rod, a floating seal assembly and a shell, wherein the spacer ring is provided with a through hole along the radial direction, the inner wall of the spacer ring, the outer wall of the valve rod and the floating seal assembly at the upper end and the lower end of the spacer ring enclose to form a leakage cavity, the shell is correspondingly provided with an air suction opening, and the air suction opening is communicated with the leakage cavity through the through hole.

9. The mechanical sealing device for the medium pressure regulating valve for the nuclear power plant as claimed in claim 2, wherein: an adjusting ring is arranged between the gland and the floating seal assembly at the outermost end.

10. The mechanical seal device for the medium pressure regulating valve for the nuclear power plant as claimed in claim 9, wherein: the lower surface of the adjusting ring is coated with a wear-resistant layer, and the wear-resistant layer is abutted to the valving ring below the wear-resistant layer.