Sealing structure of valve rod for steam turbine

Abstract

The sealing structure of the valve rod for the steam turbine comprises the valve rod arranged in a valve body, an annular groove is formed in the inner wall of the valve body, a round groove is formed in the inner wall of the front side of the annular groove, a supporting edge which is opened towards the front end is arranged on the valve rod, and a round rubber ring is arranged at the outer end of the supporting edge. And the rubber ring is forwards embedded into the circular groove. The sealing structure has the following advantages and effects: through the sealing structure, the problem of air leakage during air inlet valve control can be reduced, the influence on the working efficiency of a steam turbine is avoided, the influence of air leakage on electronic components is also avoided, and the safety of production activities is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a sealing structure of a valve stem for a steam turbine. Background Art

[0002] The valve stem is a critical component of a steam turbine's steam inlet valve. Its axial movement opens and closes the valve, and during actual operation, this opening and closing of the valve ensures the turbine's operation or shutdown. Valve stem leakage can easily lead to heat loss, noise pollution, and safety hazards. Therefore, ensuring proper sealing of the valve stem is crucial to ensure smooth turbine operation.

[0003] The traditional valve stem seal adopts a steel sleeve sealing structure, which has poor sealing effect when the steam is introduced into the regulating valve. During operation, the regulating valve is prone to leaking along the valve stem, which affects the working efficiency of the steam turbine on the one hand, and on the other hand, the leaked gas is also likely to affect electronic components, causing safety hazards. Utility Model Content

[0004] The purpose of the utility model is to provide a sealing structure of a valve stem for a steam turbine.

[0005] The above technical objectives of the present utility model are achieved through the following technical solutions: a sealing structure of a valve stem for a steam turbine, comprising a valve stem arranged in a valve body, an annular groove being arranged on the inner wall of the valve body, a circular groove being arranged on the front inner wall of the annular groove, a supporting edge being arranged on the valve stem and opening toward the front end, a circular rubber ring being arranged on the outer end of the supporting edge, and the rubber ring being embedded forward in the circular groove.

[0006] It is further configured that: the rubber ring has an extension portion, and the extension portion abuts against the bottom surface of the annular groove.

[0007] It is further configured as follows: an inner arc roll is provided on the outer end portion of the support edge and below the rubber ring.

[0008] It is further configured as follows: an annular ring is provided on the inner arc roll.

[0009] In summary, the utility model has the following beneficial effects: through the sealing structure, the bolt can reduce the air leakage problem during the air intake adjustment, avoid affecting the working efficiency of the turbine, and also avoid the impact of air leakage on electronic components, thereby ensuring the safety of production activities. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the overall schematic diagram of the sealing mechanism;

[0011] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0012] In the figure: 1. Valve body; 2. Valve stem; 3. Annular groove; 4. Circular groove; 5. Support edge; 6. Rubber ring; 7. Extension; 8. Inner arc roll; 9. Annular ring. DETAILED DESCRIPTION

[0013] The present invention will be described in further detail below with reference to the accompanying drawings.

[0014] The sealing structure of a steam turbine valve stem 2 includes a valve stem 2 disposed within a valve body 1. An annular groove 3 is provided on the inner wall of the valve body 1. A semicircular groove 4 is provided on the inner wall in front of the annular groove 3. The valve stem 2 is provided with a support edge 5 that extends forward. A circular rubber ring 6 is provided at the outer end of the support edge 5. The rubber ring 6 is embedded forward into the circular groove 4, ensuring sealing at this location when the valve stem 2 is pushed forward. The rubber ring 6 is preferably made of a material that can withstand temperatures of 250 degrees Celsius, and this structure is preferably used in locations such as end caps closer to the exterior, ensuring sealing while increasing service life.

[0015] The rubber ring 6 has an extension portion 7, which is somewhat protruding relative to the original rubber ring 6. When the valve stem 2 moves forward so that the support edge 5 approaches the front inner wall of the annular groove 3, the rubber ring 6 is embedded in the circular groove 4. Under further squeezing, the extension portion 7 contacts the bottom surface of the annular groove 3, thereby ensuring sealing.

[0016] An inner arc roll 8 is provided on the outer end of the support edge 5 below the rubber ring 6 . The inner arc roll 8 is also provided around the valve stem 2 as a whole and contacts the inner wall of the front end of the annular groove 3 .

[0017] An annular ring 9 is provided at the end of the inner coil 8. Its cross-section is circular, and any leaked gas is blocked by the structure of the inner coil 8, thereby reducing direct impact on the rubber and increasing the service life of the upper rubber. Because the annular ring 9 completely surrounds the valve stem 2, it ensures stability at the end.

[0018] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A sealing structure for a valve stem for a steam turbine, comprising a valve stem disposed within a valve body, characterized in that: An annular groove is provided on the inner wall of the valve body, a circular groove is provided on the front inner wall of the annular groove, a supporting edge is provided on the valve stem and the outer end of the supporting edge is provided with a circular rubber ring, and the rubber ring is embedded forward in the circular groove.

2. The sealing structure of a valve stem for a steam turbine according to claim 1, wherein: The rubber ring has an extension portion, which abuts against the bottom surface of the annular groove.

3. The sealing structure of a valve stem for a steam turbine according to claim 1, wherein: An inner arc roll is provided on the outer end portion of the supporting edge and is located below the rubber ring.

4. The sealing structure of a valve stem for a steam turbine according to claim 3, wherein: An annular ring is provided on the inner arc roll.

Images