CN216952581U

CN216952581U - Combined sealed drainage stop valve

Info

Publication number: CN216952581U
Application number: CN202123379456.8U
Authority: CN
Inventors: 吴振宇; 曹雪勤
Original assignee: NANTONG LONGYUAN POWER STATION VALVE CO Ltd
Current assignee: NANTONG LONGYUAN POWER STATION VALVE CO Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-07-12
Anticipated expiration: 2031-12-29

Abstract

The utility model provides a combined sealed drainage stop valve which comprises a valve shell, wherein a valve core is arranged above the valve shell, a valve seat is arranged below the valve core, a valve rod is arranged on the upper surface of the valve core, and a packing sealing assembly is arranged on the surface of the valve rod. This combination sealed hydrophobic stop valve, present disk seat adopt later stage assembled structure, great having made things convenient for later stage maintenance, owing to need not change valve casing, the effectual cost of maintenance and the time of having saved adopts throttle face and the separately design of main sealed face dislocation now for the harm of flash distillation and cavitation erosion only takes place in the throttle face department in the second cavity, and can not damage main sealed face department. The sealing effect is ensured, the service life of the main seal is prolonged, and meanwhile, the main seal surface adopts linear seal, so that the metal seal surface is easier to generate elastic deformation to fill up the microscopic gap of the seal contact surface, and zero leakage is really realized.

Description

Combined sealed drainage stop valve

Technical Field

The utility model relates to the technical field of drainage stop valves, and particularly discloses a combined sealed drainage stop valve.

Background

At present, the high-temperature and high-pressure drainage and pollution discharge stop valves used in subcritical and ultra-supercritical generator sets and main steam drainage systems of gas turbine power plants with combined cycles are generally short in service life and high in maintenance and replacement frequency due to the influences of the factors of multiple start-stop times of the generator sets, high drainage temperature and pressure, severe operation conditions and the like and the limit of self structures, and the drainage and pollution discharge stop valves are used for shutting off fluid by the connection of a valve core and a valve seat. The existing common hydrophobic stack stop valve generally adopts the steps of directly processing the inner wall of a valve body to form a valve seat, and then performing surfacing treatment on the seat surface of the valve seat to improve the hardness. In the product with the design mode, the joint of the valve seat and the valve core is a sealing surface and is also a throttling surface in the opening and closing process, so that the valve seat is extremely easy to erode and damage in use; because the structure is integrated, after the valve is damaged, the maintenance and replacement workload is large, the period is long, the cost is high, and the use is very inconvenient, a combined sealing type drainage stop valve is provided.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defect or not enough among the prior art, this application aims at providing a combination sealed hydrophobic stop valve, including the valve casing, the case is installed to the valve casing top, the disk seat is installed to the case below, case upper surface installs the valve rod, valve rod surface mounting has the packing seal assembly.

Preferably, an auxiliary sealing edge is installed on one side of the valve core, and a main sealing edge is installed on one side of the auxiliary sealing edge.

Preferably, a bolt is installed on one side of the packing seal assembly, a gasket is installed on one side of the bolt, a support is installed above the packing seal assembly, a lifting device is installed above the support, and a limiting device is installed on the lower surface of the lifting device.

Preferably, a water inlet through hole is installed on one side of the valve shell, a water outlet through hole is installed on one side of the water inlet through hole, and a second sealing surface is installed on one side of the water outlet through hole.

Preferably, a first chamber is installed on one side of the valve core, and a second chamber is installed inside the first chamber.

Preferably, a first sealing surface is arranged above the second chamber, and a third chamber is arranged below the second chamber.

Has the advantages that:

1. this combination sealed hydrophobic stop valve, present disk seat adopt later stage assembled structure, great having made things convenient for later stage maintenance, owing to need not change valve casing, the effectual cost of maintenance and the time of having saved adopts throttle face and the separately design of main sealed face dislocation now for the harm of flash distillation and cavitation erosion only takes place in the throttle face department in the second cavity, and can not damage main sealed face department. This ensures the sealing effect and prolongs the service life of the main seal.

2. This combination sealed drainage stop valve, when present stop valve was in the closed condition, the valve core bottom conical surface (throttle face) formed first way sealedly with the lower disk seat face of second chamber within a definite time, and the valve core middle part forms the second way sealedly between the slope face (main seal face) that special processing had passed through and the upper valve seat face of second chamber, and the main seal department has formed the sealed effect of efficient through the inseparable extrusion laminating of three sides. The main sealing surface adopts linear sealing, so that the metal sealing surface is easier to generate elastic deformation to fill up the microscopic gap of the sealing contact surface, and the zero leakage is really realized.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view of the overall structure of the present invention;

FIG. 2 is a schematic cross-sectional view of a portion of the structure of the present invention;

FIG. 3 is an enlarged sectional view of a portion of the structure of the present invention.

In the figure: 1. a valve housing; 2. a valve core; 3. a valve seat; 4. a valve stem; 5. a packing seal assembly; 6. a bolt; 7. a gasket; 8. a support; 9. a lifting device; 10. a limiting device; 11. a water inlet through hole; 12. a water outlet through hole; 13. a first chamber; 14. a second chamber; 15. a third chamber; 16. a first sealing surface; 17. a second sealing surface; 20. an auxiliary sealing edge; 21. a main sealing edge.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the utility model. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

The drawings in the embodiments of the utility model: the different types of hatching in the figures are not given the national standards, do not require the material of the elements, and distinguish between cross-sectional views of the elements in the figures.

Referring to fig. 1-3, a combined sealed drain stop valve includes a valve housing 1, a valve core 2 is installed above the valve housing 1, a valve seat 3 is installed below the valve core 2, a valve rod 4 is installed on the upper surface of the valve core 2, and a packing seal assembly 5 is installed on the surface of the valve rod 4, wherein the packing seal assembly 5 includes a packing pad, a packing, a spacer ring, a packing press sleeve, a packing press plate, etc., the valve core 2 is processed with a first and a second seal surface 17, i.e., a main seal surface on the upper layer and an auxiliary seal surface on the bottom side, one end of the valve core 2 is connected with the valve rod 4, the other end penetrates into a second chamber 14, the valve seat 3 is a post-mounted cylindrical box body with the second chamber 14, a processed through hole is respectively arranged on the upper and lower end surfaces, and the diameter of the through hole of the upper valve seat is larger than that of the lower valve seat. The valve seat is installed between the first chamber 13 and the third chamber 15, and the through holes at the two ends are communicated with the first chamber and the third chamber.

Wherein, the valve core 2 is provided with an auxiliary sealing edge 20 at one side, and a main sealing edge 21 is provided at one side of the auxiliary sealing edge 20.

Wherein, bolt 6 is installed to 5 one sides of packing seal assembly, and packing ring 7 is installed to 6 one sides of bolt, and support 8 is installed to 5 tops of packing seal assembly, and elevating gear 9 is installed to 8 tops of support, and stop device 10 is installed to elevating gear 9 lower surface.

Wherein, valve case 1 one side is installed into water through-hole 11, and water through-hole 12 is installed to water through-hole 11 one side, and the second sealed face 17 is installed to water through-hole 12 one side.

Wherein, a first chamber 13 is arranged at one side of the valve core 2, and a second chamber 14 is arranged in the first chamber 13.

Wherein a first sealing surface 16 is mounted above the second chamber 14 and a third chamber 15 is mounted below the second chamber 14.

When the system is in operation, as shown in fig. 1, in use: the valve core 2 moves upwards under the action of the valve rod 4, the main sealing surface of the valve core 2 is firstly opened, and at the moment, the water fluid flowing into the first chamber 13 from the water inlet through hole 11 flows to the second chamber 14 under the pushing of pressure; with the valve core 2 moving upwards continuously, then the throttling surface at the bottom end of the valve core 2 is opened gradually, the valve cavity door at the lower side starts to flow over, water fluid enters the third chamber 15, and finally flows out from the water outlet through hole 12 connected with the third chamber 15, so that the water supply communication of the water inlet through hole 12 and the water outlet through hole 12 is realized. Because the throttling is formed at the lower sealing surface, the pressure in the third chamber 15 can be reduced, and the water flow rate borne by the flow dividing surface can be increased, so that cavitation erosion, flash evaporation and scouring damage can be easily formed at the second sealing surface 17, when the valve core 2 is closed, the valve core moves downwards under the action of the valve rod 4, the second sealing port in the chamber is closed in advance, namely the communication between the second chamber 14 and the third chamber 15 is cut off; with the valve core 2 going down continuously, the first main sealing port is closed, namely the communication between the first chamber 13 and the second chamber 14 is cut off, so that the water inlet and outlet through holes 12 can be closed to block flow, the combined sealing type drainage stop valve product can be used for high-pressure water delivery, periodic pollution discharge, air exhaust, emergency water drainage and other systems with high temperature, large pressure difference and severe working conditions, the troubles that the traditional product is short in service life and easy to leak and cannot meet the working condition requirements of a unit are solved, the problem of energy loss caused by valve leakage of a power plant is also solved, and the use benefit of energy is improved.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the utility model according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A combination sealed hydrophobic stop valve, includes valve casing (1), its characterized in that: valve core (2) are installed to valve case (1) top, disk seat (3) are installed to valve core (2) below, surface mounting has valve rod (4) on valve core (2), valve rod (4) surface mounting has packing seal assembly (5).

2. The combination sealed hydrophobic shut-off valve of claim 1, wherein: an auxiliary sealing edge (20) is installed on one side of the valve core (2), and a main sealing edge (21) is installed on one side of the auxiliary sealing edge (20).

3. The combination sealed hydrophobic stop valve of claim 1, wherein: bolt (6) are installed to packing seal assembly (5) one side, packing ring (7) are installed to bolt (6) one side, support (8) are installed to packing seal assembly (5) top, elevating gear (9) are installed to support (8) top, elevating gear (9) lower surface mounting has stop device (10).

4. The combination sealed hydrophobic shut-off valve of claim 1, wherein: the valve shell (1) is provided with a water inlet through hole (11) on one side, a water outlet through hole (12) is arranged on one side of the water inlet through hole (11), and a second sealing surface (17) is arranged on one side of the water outlet through hole (12).

5. The combination sealed hydrophobic shut-off valve of claim 4, wherein: a first cavity (13) is installed on one side of the valve core (2), and a second cavity (14) is installed inside the first cavity (13).

6. The combination sealed hydrophobic shut-off valve of claim 5, wherein: a first sealing surface (16) is arranged above the second cavity (14), and a third cavity (15) is arranged below the second cavity (14).