A leak-proof plugging assembly for the faceted end of a steam turbine cylinder

Abstract

The present invention belongs to the technical field related to steam turbines and discloses an anti-leakage sealing assembly for the end of a facet in a steam turbine cylinder. The anti-leakage sealing assembly includes an upper baffle, a lower baffle, and a sealing member, wherein: the top view shape of the upper and lower baffles is the same as the shape of the portion to be sealed at the end of the facet in the cylinder; a vertical extension plate is provided at one end of the upper baffle, so that the main view of the upper baffle is in the shape of a , and a glue injection hole is provided on the extension plate; at least one clip hole is provided on the upper baffle, one end of the upper clip is provided with a protrusion, and the other end is provided with a crank hole, the upper clip is provided in the clip hole, and the crank is fixedly connected to the crank hole; a lower clip is provided on the lower baffle to cooperate with the upper clip, and the lower clip is a shaped member; the sealing member is provided on the opposite surfaces of the upper and lower baffles and the edge of the extension plate. The present application can achieve the sealing of the facet in the narrow space at the end of the steam turbine cylinder by providing a sealant in the sealing cavity between the upper baffle, the lower baffle, and the cylinder wall.

Description

Technical Field

[0001] The present invention belongs to the technical field related to steam turbines, and more particularly, relates to an anti-leakage plugging component for a faceted end portion of a steam turbine cylinder. Background Art

[0002] At present, due to the emission of greenhouse gases and various harmful gases, global warming and ecological destruction are becoming more and more serious. Due to the continuous consumption of non-renewable energy and other factors, an energy crisis has occurred. In the face of increasingly severe environmental and energy problems, new energy technologies such as solar energy and wind energy have been developed. However, new energy such as wind, light, and water are restricted by the natural environment and climatic conditions, which will increase the peak-to-valley difference of the entire power system and lead to the phenomenon of wind and light abandonment. In order to improve the power system's ability to accept new energy such as wind, light, and water, thermal power and nuclear power, as traditional energy sources, have assumed the main peak-shaving tasks. With the progress of deep peak-shaving, a series of problems have occurred in the steam turbine on the equipment side. Rapid load changes and low-load operation make the cylinder rotor blades work under more severe working conditions. For example, the cylinder is prone to large deformation under variable load conditions, and even causes steam to leak from the middle surface.

[0003] Traditional methods for dealing with cylinder center surface leakage include spraying and repair welding the center surface, increasing the bolt force around the leaking area, etc. These methods are mainly applicable to situations where there are defects in the center surface, and there are center surface bolts near the defect. At the end of the cylinder, some units do not have or cannot arrange center surface bolts at the end due to design reasons, resulting in insufficient center surface tightening force near this position. When the operating condition changes, steam leakage is likely to occur at this location. The leakage of steam from the turbine affects the turbine's work efficiency on the one hand, and seriously affects the safe operation of the turbine on the other hand. Therefore, it is urgent to design a sealing component for the end of the center surface of the turbine cylinder. Summary of the Invention

[0004] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides an anti-leakage sealing assembly for the facet end of a turbine cylinder, which can achieve the sealing of the facet in the narrow space at the end of the turbine cylinder by setting sealant in the sealing cavity between the upper baffle, the lower baffle and the cylinder wall.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an anti-leakage sealing assembly for the end of the middle face of a turbine cylinder, the anti-leakage sealing assembly comprising an upper baffle, a lower baffle and a sealing member, wherein: the top-view shape of the upper baffle and the lower baffle is the same as the shape of the part to be sealed at the end of the middle face of the cylinder; a vertical extension plate is provided at one end of the upper baffle, so that the main view of the upper baffle is L-shaped, and a glue injection hole is opened on the extension plate, and the glue injection hole is used to inject sealant; at least one snap hole is provided on the upper baffle, a protrusion is provided at one end of the upper snap, and a crank hole is provided at the other end, the upper snap is provided in the snap hole, the crank is fixedly connected to the crank hole, and then the rotation of the upper snap is realized by the crank; a lower snap is provided on the lower baffle to cooperate with the upper snap, and the lower snap is an L-shaped component; the sealing member is provided on the opposite surfaces of the upper baffle and the lower baffle and the edge of the extension plate.

[0006] Preferably, edges of the opposing surfaces of the upper baffle and the lower baffle are provided with grooves, and the sealing member is provided on the grooves.

[0007] Preferably, the sealing member is a sealing block or an elastic sealing strip.

[0008] Preferably, the cross-sectional shape of the elastic sealing strip is circular or wedge-shaped, and when it is circular, its diameter is larger than the gap between the upper baffle and the lower baffle and the cylinder wall; when the cross-sectional shape of the elastic sealing strip is wedge-shaped, the wedge is arranged along the groove and the width of the large end of the wedge is larger than the gap between the upper baffle and the lower baffle and the cylinder wall.

[0009] Preferably, the sealing member is made of rubber.

[0010] Preferably, the sealing block is wedge-shaped and is made of rubber or metal.

[0011] Preferably, when there are multiple L-shaped members, the multiple L-shaped members are arranged in a staggered manner.

[0012] Preferably, the L-shaped member is arranged perpendicular to the extension plate, and the protruding direction of the protrusion is perpendicular to the axial direction of the crank hole.

[0013] Preferably, the upper buckle is provided with a gasket, and the gasket is arranged between the crank handle and the outer surface of the upper baffle.

[0014] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects in terms of the anti-leakage plugging assembly for the faceted end of a steam turbine cylinder provided by the present invention:

[0015] 1. The present application realizes preliminary sealing of the end of the cylinder center face through the upper baffle and the lower baffle, and further injects sealant through the injection hole into the sealing chamber between the upper baffle and the lower baffle and the cylinder wall to realize strict sealing of the end of the cylinder center face. In addition, the provision of the sealing member realizes sealing while ensuring that the sealant does not leak out.

[0016] 2. The upper and lower baffles are connected by upper and lower clips to realize the interlocking structure of the sealing assembly. The upper and lower baffles can be installed from both sides of the cylinder respectively. The installation is convenient, the on-site operation is simple, and the construction space requirement is small.

[0017] 3. The edges of the opposite surfaces of the upper baffle and the lower baffle are provided with grooves, and the sealing member is provided on the grooves, so the sealing member does not protrude, does not cause additional friction during the installation process, and the installation is smooth.

[0018] 4. Use sealing blocks or elastic sealing strips for sealing. After the glue is injected, the sealing blocks or elastic sealing strips are squeezed outwards under the pressure of the sealant, making the seal tighter.

[0019] 5. A crank is used to fix and rotate the buckle. Compared with the traditional bolt connection method, the crank connection method requires less space and can be pulled out at any time and replaced in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the overall schematic diagram of the steam turbine cylinder;

[0021] Figure 2 It is a partial enlarged view of the end of the turbine cylinder;

[0022] Figure 3 yes Figure 2 A partial enlarged view of the gap in the end of the steam turbine cylinder;

[0023] Figure 4 This is a schematic diagram of the overall structure of an anti-leakage plugging assembly used for the faceted end of a steam turbine cylinder;

[0024] Figure 5 This is a schematic structural diagram of the upper baffle in an embodiment of the present application;

[0025] Figure 6 This is a schematic structural diagram of the upper buckle on the upper baffle in an embodiment of the present application;

[0026] Figure 7 This is a schematic structural diagram of the lower baffle in an embodiment of the present application;

[0027] Figure 8 It is a schematic diagram of the interlocking structure of the upper baffle and the lower baffle in an embodiment of the present application.

[0028] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0029] 100-Upper baffle:

[0030] 110- extension plate; 111- glue injection hole; 120- buckle hole; 130- upper buckle; 131- protrusion; 132- crank handle hole; 140- crank handle; 150- gasket;

[0031] 200-Lower baffle:

[0032] 210-lower buckle;

[0033] 300-Seals. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0035] Turbine cylinder Figure 1 As shown, it is made up of upper and lower cylinders buckled together, and the gap at the end is as shown Figure 2 and Figure 3 As shown, it needs to be blocked.

[0036] The present invention provides a leak-proof plugging assembly for the end of the split surface of a steam turbine cylinder, such as Figure 4 As shown, the anti-leakage sealing assembly includes an upper baffle 100 , a lower baffle 200 and a sealing member 300 .

[0037] The top view shape of the upper baffle 100 and the lower baffle 200 is the same as the shape of the portion to be blocked at the end of the cylinder face. Since the shape of the portion to be blocked is generally irregular, the upper baffle 100 and the lower baffle 200 are also generally irregular plates.

[0038] like Figure 5 As shown, a vertical extension plate 110 is provided at one end of the upper baffle 100, so that the main view of the upper baffle 100 is L-shaped, and a glue injection hole 111 is opened on the extension plate 110, so that the outline of the combination of the upper baffle 100 and the lower baffle 200 contacts three sides of the outer wall of the turbine, and a cavity is formed inside the upper baffle 100 and the lower baffle 200. The glue injection hole 111 is used to inject sealant into the cavity, and the injection pressure is preferably 1MPa to 2MPa.

[0039] The upper baffle 100 is provided with at least one snap hole 120. Figure 6As shown, the upper buckle 130 has a protrusion 131 at one end and a crank hole 132 at the other end. The upper buckle 130 is positioned in the buckle hole 120, and a crank handle 140 is fixedly connected to the crank hole 132, thereby enabling the upper buckle 130 to rotate. To facilitate installation and rotation, the upper buckle 130 and the buckle hole 120 are clearance-fitted, and the crank handle 140 is fixedly connected to the crank hole 132. The crank handle 140 can be a cylindrical pin or a tapered pin. In a further preferred embodiment, a gasket 150 is sleeved on the upper buckle 130 and positioned between the crank handle 140 and the outer surface of the upper baffle 100. The gasket 150 is fitted with the upper buckle 130 through a transition fit or an interference fit. When sealant is injected into the chamber, the gasket 150 is pressed against the inner side of the upper baffle by the pressure of the sealant to prevent the sealant from leaking from the buckle hole 120, thereby ensuring the sealing of the buckle hole 120. The thickness is generally about 1 mm and the surface is smooth.

[0040] In a further preferred embodiment, a small hole is provided on the crank handle 140, through which a chain or rope is passed. When the construction space at the end of the cylinder is small, the rope can be pulled to realize the rotation of the upper buckle.

[0041] like Figure 7 As shown, the lower baffle 200 is provided with a lower buckle 210 that cooperates with the upper buckle 130. The lower buckle 210 is an L-shaped component. The L-shaped component and the protrusion 131 of the upper buckle 130 can form an interlocking structure, as shown in FIG. Figure 8 The lower buckle 210 is fastened to the surface of the lower baffle 200 by welding or threading.

[0042] The sealing member 300 is disposed on the opposite surfaces of the upper baffle 100 and the lower baffle 200 and on the edge of the extension plate 110 .

[0043] In a further preferred solution, edges of the opposing surfaces of the upper baffle 100 and the lower baffle 200 are provided with grooves, and the sealing member 300 is provided on the grooves.

[0044] In a further preferred embodiment, the sealing member 300 is a sealing block or an elastic sealing strip.

[0045] In a further preferred embodiment, the cross-sectional shape of the elastic sealing strip is circular or wedge-shaped. When it is circular, its diameter is larger than the gap between the upper baffle 100, the lower baffle 200 and the cylinder wall. The specific diameter of the elastic sealing strip is related to the gap of the outer wall sealing component and the working pressure of the sealing injection. Under a certain pressure, the elastic sealing strip will not be squeezed out of the gap, thereby causing the chamber sealing to fail.

[0046] When the cross-sectional shape of the elastic sealing strip is wedge-shaped, the wedge is arranged along the groove and the width of the large end of the wedge is greater than the gap between the upper baffle 100 and the lower baffle 200 and the cylinder wall, and the total deformation of the elastic sealing strip should be within its elastic range.

[0047] In a further preferred solution, the sealing block is wedge-shaped, and the material of the sealing block is rubber or metal, and is further preferably a copper sealing block. The high-pressure colloid in the sealing chamber presses the copper sealing block into the groove, and utilizes the copper block's lower hardness to fit tightly with the cylinder wall after deformation, thereby achieving sealing between the sealing assembly and the cylinder wall and between the upper baffle and the lower baffle.

[0048] When there are multiple L-shaped members, the multiple L-shaped members are arranged in a staggered manner. In a further preferred solution, the L-shaped members are arranged perpendicular to the extension plate 110 , and the protrusion 131 is perpendicular to the axial direction of the crank hole 132 .

[0049] During installation, several welding points or horizontal bolts can be set on the cylinder wall, and the sealing assembly is placed on the welding points or bolts to ensure vertical fixation. The anti-leakage sealing assembly acts on the center surface of the turbine cylinder end. The edge shape of the sealing assembly basically fits the cylinder wall, and the principle of pressure plugging is used to seal the narrow steam leakage area. When sealing, the anti-leakage sealing assembly is placed and connected to the glue injection gun, and glue is injected into the sealing chamber. The pressurized sealant will penetrate into the center surface of the cylinder and the internal cavity of the anti-leakage sealing assembly, filling various gaps and ultimately achieving the sealing of the center surface of the cylinder end.

[0050] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A leak-proof plugging assembly for the end of a split surface in a steam turbine cylinder, characterized in that: The anti-leakage sealing assembly comprises an upper baffle (100), a lower baffle (200) and a sealing member (300), wherein: The top view shapes of the upper baffle (100) and the lower baffle (200) are the same as the shapes of the portions to be blocked at the ends of the split surfaces in the cylinder; A vertical extension plate (110) is provided at one end of the upper baffle (100), so that the main view of the upper baffle (100) is L-shaped, and a glue injection hole (111) is opened on the extension plate (110), and the glue injection hole (111) is used to inject sealant; At least one buckle hole (120) is provided on the upper baffle (100), a protrusion (131) is provided on one end of the upper buckle (130), and a crank hole (132) is provided on the other end, the upper buckle (130) is provided in the buckle hole (120), and the crank (140) is fixedly connected to the crank hole (132), so that the upper buckle (130) can be rotated by the crank (140); The lower baffle (200) is provided with a lower buckle (210) that cooperates with the upper buckle (130), and the lower buckle (210) is an L-shaped component; The sealing member (300) is provided on the opposite surfaces of the upper baffle (100) and the lower baffle (200) and on the edge of the extension plate (110).

2. The anti-leakage sealing assembly according to claim 1, characterized in that: The edges of the opposing surfaces of the upper baffle (100) and the lower baffle (200) are provided with grooves, and the sealing member (300) is provided on the grooves.

3. The anti-leakage sealing assembly according to claim 2, characterized in that: The sealing member (300) is a sealing block or an elastic sealing strip.

4. The anti-leakage sealing assembly according to claim 3, characterized in that: The cross-sectional shape of the elastic sealing strip is circular or wedge-shaped. When it is circular, its diameter is larger than the gap between the upper baffle (100) and the lower baffle (200) and the cylinder wall. When the cross-sectional shape of the elastic sealing strip is wedge-shaped, the wedge is arranged along the groove and the width of the large end of the wedge is larger than the gap between the upper baffle (100) and the lower baffle (200) and the cylinder wall.

5. The anti-leakage sealing assembly according to any one of claims 2 to 3, characterized in that: The material of the sealing element (300) is rubber.

6. The anti-leakage sealing assembly according to claim 3, characterized in that: The sealing block is in a wedge shape and is made of rubber or metal.

7. The anti-leakage sealing assembly according to claim 1, characterized in that: When there are multiple L-shaped members, the multiple L-shaped members are arranged in a staggered manner.

8. The anti-leakage sealing assembly according to claim 1 or 7, characterized in that: The L-shaped component is arranged perpendicularly to the extension plate (110), and the protruding direction of the protrusion (131) is perpendicular to the axial direction of the crank hole (132).

9. The anti-leakage sealing assembly according to claim 1, characterized in that: A gasket (150) is sleeved on the upper buckle (130), and the gasket (150) is arranged between the crank handle (140) and the outer surface of the upper baffle (100).

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