Non-fully surrounded planar seal fillet seal

Abstract

The utility model discloses a non-fully-surrounded plane sealing angle seam sealing piece, and relates to the technical field of steam turbines. The steam cylinder lower half body comprises a steam cylinder lower half body, two square notches are formed in the positions, close to the bolts, of the inner sides of the two sides of the split of the steam cylinder lower half body, O-shaped rubber strips are arranged in the two square notches, steam collecting grooves are formed by the O-shaped rubber strips and the inner walls of the square notches, and steam collecting openings are formed in the two ends of the two square notches. The steam flow is guided to the steam collecting port by the square notch; in the utility model, a circle of O-shaped rubber strip is additionally arranged on the upper and lower split surfaces of the cylinder close to the bolt, the O-shaped rubber strip has a certain self-sealing effect, the upper and lower cylinders of the steam turbine are in a static sealing state and can reach an almost zero-leakage state, and the O-shaped rubber strip has a certain compression amount, so that the sealing effect can be achieved when the upper and lower split surfaces are deformed in the working process of the cylinder body; the sealing effect can be achieved by adjusting the notch depth or replacing the sealing strip according to the deformation of the cylinder body in later maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a non-fully enclosed planar seal corner joint seal. Background Art

[0002] Steam turbine generators are the main equipment for nuclear power and thermal power generation. Among the operating steam turbine generators, most are medium-temperature and medium-pressure, high-temperature and high-pressure, and ultra-high-pressure type units;

[0003] During long-term operation under harsh conditions of high temperature and high pressure, due to reasons such as micro-vibration, stress release, hot gas corrosion, and erosion, etc., multiple deformations and damages occur on the split surface. Even grooves and pits are punched out on the split surface of the cylinder. If the split surface is not tightly sealed, a large amount of high-quality steam will leak, which not only reduces the work efficiency of the steam turbine and increases the production cost of the enterprise, but also the leakage of a large amount of steam will affect the stability of the steam turbine and even endanger the safe operation of the steam turbine generator, thus increasing potential safety hazards;

[0004] However, there are still some defects in the treatment methods of the existing technology:

[0005] Currently, the sealing methods for the split surface of steam turbine equipment are generally divided into four methods: locally adding copper wire cloth, spraying treatment, repair welding treatment, and scraping treatment. Laying copper wire cloth and spraying are simple but have a short service life. Repair welding and scraping are heavy and time-consuming, and are likely to cause cylinder deformation. Summary of the Invention

[0006] In order to solve the problem of steam leakage at the upper and lower split surfaces of the steam turbine; the purpose of the utility model is to provide a non-fully enclosed planar seal corner joint seal.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme: a non-fully enclosed planar seal corner joint seal, including the lower half body of the cylinder. At the positions on both inner sides of the split surface of the lower half body of the cylinder near the bolts, two square notches are opened. Inside both of the two square notches, O-ring rubber strips are arranged. The O-ring rubber strips and the inner walls of the square notches form steam collecting grooves. At both ends of the two square notches, steam collecting ports are arranged. The square notches guide the steam flow to the steam collecting ports. At both ends of the two square notches, blocking blocks are arranged. Circular notches are opened on all four blocking blocks. The O-ring rubber strips penetrate through the circular notches and are in interference fit with the inner walls of the circular notches.

[0008] Preferably, the depth of the compression amount of the O-ring rubber strip is reserved at 15% - 30%.

[0009] Preferably, the O-ring rubber strip is made of an elastic material.

[0010] Preferably, two drain grooves are provided at the gland of the middle part of the lower half body of the cylinder. The drain grooves are annular, and one end of each of the two square notches communicates with the two drain grooves.

[0011] Preferably, circular grooves are provided at both ends of the two square notches, and the blocking blocks are in interference fit with the circular grooves.

[0012] Preferably, the surplus of the O-ring is 0.2 mm higher than the upper surface of the blocking block.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. In the present utility model, by adding a circle of O-rings near the bolts at the upper and lower middle parting surfaces of the cylinder, due to the self-sealing effect of the O-rings, the upper and lower cylinders of the steam turbine are in a static sealing state and can achieve almost zero leakage. The O-rings have a certain amount of compression. Therefore, when the upper and lower middle parting surfaces deform during the operation of the cylinder block, it can also play a sealing role. During later maintenance, the depth of the notch can be adjusted according to the deformation amount of the cylinder block or the sealing strip can be replaced to achieve the sealing effect;

[0015] 2. In the present utility model, by using O-rings, there are many types of O-ring materials, and the selection range is wide. It can be selected according to the operating temperature and environmental conditions of the equipment. The price is cheap and the installation cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the non-full-surrounding plane seal corner joint seal of the present utility model.

[0018] Figure 2 For the present utility model Figure 1 The enlarged schematic diagram of part A.

[0019] Figure 3 It is a separation schematic diagram of the O-ring and the square notch of the present utility model.

[0020] Figure 4 For the present utility model Figure 3 The enlarged schematic diagram of part B.

[0021] Figure 5 It is a connection structure schematic diagram of the blocking block and the O-ring of the present utility model.

[0022] Figure 6 This is a schematic structural diagram of the blocking block of the present utility model.

[0023] In the figure: 1. Lower half main body of the cylinder; 2. Square notch; 3. O-ring; 4. Steam collecting groove; 5. Steam collecting port; 6. Circular groove; 7. Blocking block; 8. Circular notch; 9. Drainage groove. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Embodiment: As Figures 1-6As shown in the figure, the present utility model provides a non-fully enclosed planar seal corner joint seal, including the lower half body 1 of the cylinder. Two square notches 2 are opened at the inner sides of both sides of the split surface of the lower half body 1 of the cylinder near the bolts. O-ring rubber strips 3 are arranged inside both of the two square notches 2. The compression depth of the O-ring rubber strips 3 is reserved by 15% - 30%. The O-ring rubber strips 3 are made of elastic materials. The O-ring rubber strips 3 and the inner walls of the square notches 2 form steam collecting grooves 4. Steam collecting ports 5 are arranged at both ends of both of the two square notches 2. By opening two square notches 2 at the inner sides of both sides of the split surface of the lower half body 1 of the cylinder near the bolts and arranging O-ring rubber strips 3 inside the two square notches 2, when steam in the cylinder leaks from the split surface, the O-ring rubber strips 3 are compressed, and the square notches 2 guide the steam flow to the steam collecting ports 5 of the steam seal body. At the same time, by opening square notches 2 and arranging O-ring rubber strips 3 at the positions near the bolts, the compression force of the bolts can make the compression amount of the O-ring rubber strips 3 larger, and the seal is tighter. The square notches 2 guide the steam flow to the steam collecting ports 5. Blocking blocks 7 are arranged at both ends of both of the two square notches 2. Circular notches 8 are opened on all four blocking blocks 7. The O-ring rubber strips 3 penetrate through the circular notches 8 and are in interference fit with the inner walls of the circular notches 8. By arranging the blocking blocks 7, when the steam flow in the steam collecting groove 4 flows to this place, it is blocked by the blocking blocks 7, and 99% of the leaked steam is sealed in the cylinder body, playing a sealing role. During the long-term operation of the steam turbine, the split surface will have slight deformation. The O-ring rubber strips 3 are elastic and have self-sealing properties and still play a sealing role, which can delay the overhaul time of the cylinder body. Drainage grooves 9 are opened at the steam seal body in the middle of the lower half body 1 of the cylinder. The drainage grooves 9 are annular. One end of both of the two square notches 2 is communicated with the two drainage grooves 9. Circular grooves 6 are opened at both ends of both of the two square notches 2. The blocking blocks 7 are in interference fit with the circular grooves 6. The surplus of the O-ring rubber strips 3 is 0.2 mm higher than the upper surface of the blocking blocks 7. When the cylinder body is compressed, there is still elastic sealing of the O-ring rubber strips 3 at the positions of the blocking blocks 7 to prevent steam from leaking out. The tight fit between the blocking blocks 7 and the O-ring rubber strips 3 can effectively prevent steam from entering the steam collecting part of the steam seal body along the gap between the O-ring rubber strips 3 and the circular notches 8. By arranging the drainage grooves 9, a very small amount of steam that is not blocked can be condensed and discharged from the drainage ports.

[0026] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these modifications and variations.

Claims

1. A non-fully enclosed flat sealing corner seal, comprising a cylinder lower half body (1), characterized in that: Two square notches (2) are provided at positions near the bolts on the inner sides of the two sides of the dividing surface of the lower half of the cylinder (1), and the inside of the two square notches (2) is provided with an O-shaped rubber strip (3), and the O-shaped rubber strip (3) and the inner wall of the square notch (2) form a steam collecting groove (4), and steam collecting ports (5) are provided at both ends of the two square notches (2), and the square notch (2) guides the steam flow to the steam collecting port (5), and blocking blocks (7) are provided at both ends of the two square notches (2), and circular notches (8) are provided on the four blocking blocks (7), and the O-shaped rubber strip (3) passes through the circular notch (8) and is interference fit with the inner wall of the circular notch (8).

2. The non-fully enclosed flat sealing corner seam seal according to claim 1, characterized in that: The compression depth of the O-type rubber strip (3) is reserved at 15% to 30%.

3. The non-fully enclosed flat sealing corner seam seal according to claim 1, characterized in that: The O-shaped rubber strip (3) is made of elastic material.

4. The non-fully enclosed flat sealing corner seam seal according to claim 1, characterized in that: Two drainage grooves (9) are provided at the steam seal body in the middle of the lower half of the cylinder body (1). The drainage grooves (9) are ring-shaped, and one end of the two square notches (2) is connected to the two drainage grooves (9).

5. The non-fully enclosed flat sealing corner seam seal according to claim 1, characterized in that: Circular grooves (6) are provided at both ends of the two square notches (2), and the blocking block (7) is interference-fitted with the circular grooves (6).

6. The non-fully enclosed flat sealing corner seam seal according to claim 1, characterized in that: The excess of the O-type rubber strip (3) is 0.2 mm higher than the upper surface of the blocking block (7).

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