External plugging device and method for steam leakage at the end of a steam turbine cylinder

Abstract

The present application provides an external plugging device and method for steam leakage at the end of a steam turbine cylinder. The external plugging device includes an upper half of a rubber pressure plate, a lower half of a rubber pressure plate, a first hexagonal bolt, a second hexagonal bolt, a first sealing rubber, and a second sealing rubber. The outer dimensions of the first sealing rubber and the second sealing rubber match the outer dimensions of the space where the steam leakage occurs in the cylinder. The second sealing rubber and the first sealing rubber are used to be stacked and installed in sequence on the lower half of the rubber pressure plate, and the upper half of the rubber pressure plate is used to be installed on the first sealing rubber. The first hexagonal bolt is used to be installed on a first mounting hole provided on both the upper half of the rubber pressure plate and the lower half of the rubber pressure plate. The second hexagonal bolt is used to be installed on a second mounting hole provided on the side of the lower half of the rubber pressure plate. The present application designs an elastic plugging device that matches the shape and size of the steam turbine cylinder to solve the problems of specific application scenarios and long processing time in the existing steam leakage plugging methods at the end of the steam turbine cylinder.

Description

Technical Field

[0001] The present application belongs to the technical field of steam turbines, and in particular relates to an external plugging device and method for steam leakage at the end of a steam turbine cylinder. Background Art

[0002] During the long-term operation of the steam turbine, the cylinder joint surface will be deformed, resulting in reduced sealing performance of the joint surface and steam leakage. Because the structure of the cylinder end is relatively complex and irregular, the most common location for steam leakage is the end of the turbine cylinder.

[0003] The common methods currently used are: scraping the cylinder joint surface to ensure the flatness of the joint surface; applying sealing grease to the cylinder joint surface; repair welding the leaking position of the cylinder joint surface; coating, spraying or installing gaskets on the cylinder joint surface; increasing the bolt preload at the leaking position. However, the above methods all have specific application scenarios and take a long time to process. At the same time, because the deformation of the cylinder is mainly due to the uneven thermal expansion of the cylinder, the uneven deformation of the cylinder is aggravated by the peak load during the operation of the turbine. Directly processing the joint surface or adjusting the bolt preload requires repeated adjustments to achieve the desired effect. Summary of the invention

[0004] In view of this, the present application is committed to providing an external sealing device and method for steam leakage at the end of a turbine cylinder. By adding a pressurized plugging device to the outside of the turbine cylinder body, an elastic plugging device matching the shape and size of the turbine cylinder is designed to solve the problem that the existing steam leakage treatment method at the end of the turbine cylinder has specific application scenarios and a long treatment time.

[0005] In a first aspect, the present application provides an external plugging device for steam leakage at the end of a steam turbine cylinder, the external plugging device for steam leakage at the end of a steam turbine cylinder comprises an upper half of a rubber pressure plate, a lower half of a rubber pressure plate, a first hexagonal bolt, a second hexagonal bolt, a first sealing rubber and a second sealing rubber. The outer dimensions of the first sealing rubber and the second sealing rubber match the outer dimensions of the space where the steam leakage occurs in the cylinder. The second sealing rubber and the first sealing rubber are used to be stacked and installed on the lower half of the rubber pressure plate in sequence, and the upper half of the rubber pressure plate is used to be installed on the first sealing rubber. The upper half of the rubber pressure plate and the lower half of the rubber pressure plate are both provided with a first mounting hole. The first hexagonal bolt is used to be installed on the first mounting hole to connect the upper half of the rubber pressure plate and the lower half of the rubber pressure plate from top to bottom. The side of the lower half of the rubber pressure plate is provided with a second mounting hole. The second hexagonal bolt is used to be installed on the second mounting hole to connect the upper half of the rubber pressure plate and the lower half of the rubber pressure plate from side to side.

[0006] In a specific embodiment of the present application, the upper half of the rubber pressure plate includes a bolt mounting plate and an upper half of an extrusion structure. A rubber mounting block mounting hole is provided on a side of the upper half of the extrusion structure away from the bolt mounting plate. The rubber mounting block mounting hole is used to mount the lower half of the rubber pressure plate. The bolt mounting plate is used to mount the first hexagonal bolt.

[0007] In a specific embodiment of the present application, the upper half of the extruded structure has a four-sided groove shape that is in direct contact with the upper surface of the first sealing rubber.

[0008] In a specific embodiment of the present application, the lower half of the rubber pressure plate includes a rubber mounting block, a sealing rubber limiting structure and a lower half of the extrusion structure. The rubber mounting block is the mounting position of the first sealing rubber and the second sealing rubber, and is used to limit the front, back, left, and right positions of the first sealing rubber and the second sealing rubber. The sealing rubber limiting structure is used to limit the expansion and deformation of the tail of the sealing rubber.

[0009] In a specific embodiment of the present application, the first sealing rubber and the second sealing rubber have a square hole in the middle that is consistent with the shape and size of the rubber mounting block of the lower half of the rubber pressing plate. The second sealing rubber and the first sealing rubber penetrate into the rubber mounting block of the lower half of the rubber pressing plate through the square hole in the middle.

[0010] In a specific embodiment of the present application, the sealing rubber limiting structure is provided with an oblong hole, and the oblong hole is used to install the second hexagonal bolt.

[0011] In a specific embodiment of the present application, the lower half of the extruded structure has a four-sided groove shape that is in direct contact with the lower surface of the second sealing rubber.

[0012] The second aspect of the present application provides an external plugging method for steam leakage at the end of a turbine cylinder, and the external plugging method for steam leakage at the end of a turbine cylinder comprises: stacking a second sealing rubber and a first sealing rubber in sequence on the lower half of a rubber pressure plate; after the first sealing rubber and the second sealing rubber are installed, placing the lower half of the rubber pressure plate at the steam leakage position of the cylinder joint surface, adjusting the upper and lower positions of the rubber pressure plate so that the first sealing rubber and the second sealing rubber are completely in contact with the cylinder steam leakage position; installing the upper half of the rubber pressure plate on the first sealing rubber; connecting the upper half of the rubber pressure plate and the lower half of the rubber pressure plate up and down with a first hexagonal bolt, and controlling the extrusion depth of the upper half of the rubber pressure plate and the lower half of the rubber pressure plate by adjusting the screw-in depth of the first hexagonal bolt, and indirectly controlling the expansion amount of the first sealing rubber and the second sealing rubber, so as to plug the steam leakage position of the turbine cylinder end by relying on the contact pressure between the first sealing rubber and the second sealing rubber and the cylinder body; installing the second hexagonal bolt on the second mounting hole to connect the upper half of the rubber pressure plate and the lower half of the rubber pressure plate from the side.

[0013] The beneficial effect of the technical solution of the present application is that: by setting the outer dimensions of the first sealing rubber and the second sealing rubber to match the outer dimensions of the space of the cylinder steam leakage position, the first sealing rubber and the second sealing rubber are used to seal the cylinder steam leakage position, and the design of the compressible elastic rubber of the first sealing rubber and the second sealing rubber can form a higher contact pressure at the cylinder leakage position to achieve the plugging effect, so that the steam leakage position of the steam turbine cylinder is blocked without opening the cylinder of the unit, that is, the problem of steam leakage at the end of the steam turbine cylinder is solved without opening the cylinder, and at the same time, the original structure of the cylinder is not changed, and the cylinder joint surface does not need to be processed to avoid the irreversible effect of processing the joint surface. By adopting the upper and lower split structure of the rubber pressure plate upper half and the rubber pressure plate lower half, the external plugging device for steam leakage at the end of the steam turbine cylinder is conducive to on-site installation and removal. By using the first hexagonal bolt to connect the upper and lower half of the rubber pressure plate, the expansion of the rubber is adjusted by adjusting the first hexagonal bolt, and the contact pressure between the external plugging device for steam leakage at the end of the steam turbine cylinder and the cylinder surface is changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic diagram of the three-dimensional structure of an external sealing device for steam leakage at the end of a turbine cylinder provided by an embodiment of the present application.

[0015] Figure 2 Shown Figure 1 The figure shows a schematic diagram of the explosion structure of an external sealing device for steam leakage at the end of a steam turbine cylinder.

[0016] Figure 3A Shown is a schematic diagram of the three-dimensional structure of the upper half of a rubber pressure plate in an external plugging device for steam leakage at the end of a turbine cylinder provided by an embodiment of the present application.

[0017] Figure 3B Shown Figure 3A A schematic front view of the upper half of the rubber pressure plate is shown.

[0018] Figure 3C Shown Figure 3A A schematic side view of the upper half of the rubber pressure plate is shown.

[0019] Figure 3D Shown Figure 3A A bottom view of the upper half of the rubber pressure plate is shown.

[0020] Figure 4A Shown is a schematic diagram of the three-dimensional structure of the lower half of a rubber pressure plate in an external sealing device for steam leakage at the end of a turbine cylinder provided by an embodiment of the present application.

[0021] Figure 4B Shown Figure 4AA schematic front view of the lower half of the rubber pressure plate is shown.

[0022] Figure 4C Shown Figure 4A A schematic side view of the lower half of the rubber pressure plate is shown.

[0023] Figure 4D Shown Figure 4A A schematic top view of the lower half of the rubber pressure plate is shown.

[0024] Figure 5A Shown is a schematic structural diagram of an external sealing device for steam leakage at the end of a steam turbine cylinder provided by one embodiment of the present application during assembly.

[0025] Figure 5B Shown Figure 5A The figure shows an assembly of an external sealing device for steam leakage at the end of a steam turbine cylinder.

[0026] Figure 6 Shown is a schematic diagram of the installation position of an external sealing device for steam leakage at the end of a steam turbine cylinder provided by an embodiment of the present application.

[0027] In the figure: 1. upper half of rubber pressure plate; 2. lower half of rubber pressure plate; 3. first hexagonal bolt; 4. second hexagonal bolt; 5. first sealing rubber; 6. second sealing rubber; 7. external sealing device; 8. turbine cylinder; 9. turbine cylinder shaft seal shell; 10. turbine rotor; 1.1. mounting hole of rubber mounting block; 1.2. bolt mounting plate; 1.3. upper half of extrusion structure; 2.1. rubber mounting block; 2.2. sealing rubber limiting structure; 2.3. lower half of extrusion structure. DETAILED DESCRIPTION

[0028] After careful study, it is found that the solution to the technical problem mentioned in the background technology is preferably to ensure the sealing performance of the steam leakage position without directly processing the cylinder joint surface. In view of this method, the embodiment of the present application proposes a plugging device for treating the steam leakage problem at the end of the turbine cylinder, which can ensure the sealing performance of the cylinder joint surface under high temperature and pressure conditions, while avoiding direct processing of the cylinder joint surface to reduce irreversible damage to the joint surface.

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] At least one embodiment of the present application provides an external plugging device for steam leakage at the end of a steam turbine cylinder. The external plugging device 7 for steam leakage at the end of a steam turbine cylinder can be installed outside the cylinder body of the steam turbine. Figures 1 to 6 The external plugging device 7 for steam leakage at the end of the steam turbine cylinder includes an upper rubber pressure plate 1, a lower rubber pressure plate 2, a first hexagonal bolt 3, a second hexagonal bolt 4, a first sealing rubber 5 and a second sealing rubber 6. The outer dimensions of the first sealing rubber 5 and the second sealing rubber 6 match the outer dimensions of the space where the steam leakage occurs in the cylinder. The second sealing rubber 6 and the first sealing rubber 5 are used to be stacked and installed on the lower rubber pressure plate 2 in sequence, and the upper rubber pressure plate 1 is used to be installed on the first sealing rubber 5. The upper rubber pressure plate 1 and the lower rubber pressure plate 2 are both provided with a first mounting hole. The first hexagonal bolt 3 is used to be installed on the first mounting hole to connect the upper rubber pressure plate 1 and the lower rubber pressure plate 2 up and down. The side of the lower rubber pressure plate 2 is provided with a second mounting hole. The second hexagonal bolt 4 is used to be installed on the second mounting hole to connect the upper rubber pressure plate 1 and the lower rubber pressure plate 2 laterally.

[0031] It should be noted that the first sealing rubber 5 and the second sealing rubber 6 can be compressible high temperature resistant elastic rubber. The first sealing rubber 5 and the second sealing rubber 6 can be upgraded and replaced according to actual needs, and the sealing effect of the device can be improved according to the performance of subsequent new materials.

[0032] According to the technical solution provided in the embodiment of the present application, by setting the outer dimensions of the first sealing rubber 5 and the second sealing rubber 6 to match the outer dimensions of the space of the cylinder steam leakage position, the first sealing rubber 5 and the second sealing rubber 6 are used to block the cylinder steam leakage position, and the design of the compressible elastic rubber of the first sealing rubber 5 and the second sealing rubber 6 can form a high contact pressure at the cylinder leakage position to achieve the plugging effect, so that the steam leakage position of the turbine cylinder is blocked without opening the cylinder of the unit, that is, the steam leakage problem at the end of the turbine cylinder is solved without opening the cylinder, and at the same time, the original structure of the cylinder is not changed, and the cylinder joint surface does not need to be processed to avoid the irreversible effects of processing the joint surface. By adopting the upper and lower split structure of the rubber pressure plate upper half 1 and the rubber pressure plate lower half 2, the external plugging device 7 for steam leakage at the end of the turbine cylinder is convenient for on-site installation and removal. By using the first hexagonal bolt 3 to connect the upper half 1 and the lower half 2 of the rubber pressure plate, the expansion amount of the rubber can be adjusted by adjusting the first hexagonal bolt 3, thereby changing the contact pressure between the external sealing device 7 for steam leakage at the end of the turbine cylinder and the cylinder surface.

[0033] In addition, when the turbine is not opened or the flatness of the turbine joint surface is within the standard range but there is still end steam leakage, the external plugging device 7 for steam leakage at the end of the turbine cylinder is installed at the position of the steam leakage at the end of the cylinder to achieve the plugging effect. The external plugging device 7 has few installation and use conditions and low requirements, and can be used in emergency situations; the external plugging device 7 has a simple and compact structure, a simple processing technology, a short processing cycle, and is easy to install and disassemble, saving maintenance time. Based on the above analysis, the external plugging device 7 for steam leakage at the end of the turbine cylinder is a safe, reliable, and efficient pressure plugging device.

[0034] In at least one embodiment of the present application, reference FIG. 3A to FIG. 3D The rubber pressing plate upper half 1 includes a bolt mounting plate 1.2 and an extrusion structure upper half 1.3. A rubber mounting block mounting hole 1.1 is provided on the side of the extrusion structure upper half 1.3 away from the bolt mounting plate 1.2. The rubber mounting block mounting hole 1.1 is used to mount the rubber pressing plate lower half 2. The bolt mounting plate 1.2 is used to mount the first hexagonal bolt 3.

[0035] In at least one embodiment of the present application, the upper extrusion structure 1.3 has a four-sided groove shape that directly contacts the upper surface of the first sealing rubber 5. Thus, by setting the upper extrusion structure 1.3 as a groove shape structure, the upper extrusion structure 1.3 can be used to fully squeeze the upper surface of the first sealing rubber 5.

[0036] In at least one embodiment of the present application, reference 4A to 4D The lower half 2 of the rubber pressure plate includes a rubber mounting block 2.1, a sealing rubber limiting structure 2.2 and a lower half 2.3 of the extrusion structure. The rubber mounting block 2.1 is the mounting position of the first sealing rubber 5 and the second sealing rubber 6, and is used to limit the front, back, left, and right positions of the first sealing rubber 5 and the second sealing rubber 6; the sealing rubber limiting structure 2.2 is used to limit the expansion and deformation of the tail of the sealing rubber.

[0037] In at least one embodiment of the present application, a square hole is provided in the middle of the first sealing rubber 5 and the second sealing rubber 6, which is consistent in shape and size with the rubber mounting block 2.1 of the lower half 2 of the rubber pressing plate. The second sealing rubber 6 and the first sealing rubber 5 are inserted into the rubber mounting block 2.1 of the lower half 2 of the rubber pressing plate through the square hole in the middle.

[0038] In at least one embodiment of the present application, the sealing rubber limiting structure 2.2 is provided with an oblong hole, and the oblong hole is used to install the second hexagonal bolt 4. Thus, by providing the oblong hole on the sealing rubber limiting structure 2.2, the adjustment space of the second hexagonal bolt 4 is increased, and the installation position of the second hexagonal bolt 4 can be adjusted according to the position of the upper half 1 of the rubber pressure plate.

[0039] In at least one embodiment of the present application, the lower half 2.3 of the extrusion structure has a four-sided groove shape that directly contacts the lower surface of the second sealing rubber 6. Thus, by setting the lower half 2.3 of the extrusion structure to a groove shape structure, the lower surface of the second sealing rubber 6 can be fully extruded by the lower half 2.3 of the extrusion structure.

[0040] It should be noted that the rubber mounting block mounting hole 1.1 is used to mount the rubber mounting block 2.1 of the lower half 2 of the rubber pressure plate.

[0041] In the above embodiment, the groove structure of the upper and lower working surfaces of the external plugging device 7 facilitates the extrusion of the rubber, thereby ensuring that the rubber is fully extruded and reducing the difficulty of adjusting the clamping bolt.

[0042] At least one embodiment of the present application further provides an external plugging method for steam leakage at the end of a steam turbine cylinder, which is implemented by using an external plugging device for steam leakage at the end of a steam turbine cylinder of the above embodiment. The external plugging method for steam leakage at the end of a steam turbine cylinder includes the following steps.

[0043] Step 1: Install the second sealing rubber 6 and the first sealing rubber 5 in sequence on the lower half 2 of the rubber pressing plate.

[0044] For example, combining 4A to 4D , Figure 6 It is explained that the lower half 2 of the rubber pressing plate has a rubber mounting block 2.1. A square hole is provided in the middle of the first sealing rubber 5 and the second sealing rubber 6, which is consistent in shape and size with the rubber mounting block 2.1 of the lower half 2 of the rubber pressing plate. The second sealing rubber 6 and the first sealing rubber 5 are inserted into the rubber mounting block 2.1 of the lower half 2 of the rubber pressing plate through the square hole in the middle.

[0045] Step 2: After the first sealing rubber 5 and the second sealing rubber 6 are installed, place the lower half 2 of the rubber pressing plate on the steam leakage position of the cylinder joint surface. Adjust the upper and lower positions of the lower half 2 of the rubber pressing plate so that the first sealing rubber 5 and the second sealing rubber 6 are completely fitted with the steam leakage position of the cylinder.

[0046] Specifically, refer to Figure 1 , Figure 2 and Figure 6 , Figure 6 The actual installation position of the external plugging device 7 at the end of the turbine cylinder is shown. Figure 6 Among them, 8 is the steam turbine cylinder, 9 is the steam turbine cylinder shaft seal shell, and 10 is the steam turbine rotor.

[0047] Step 3: Install the upper half 1 of the rubber pressing plate on the first sealing rubber 5.

[0048] For example, combining Figures 2 to 3D , Figure 5A and Figure 5B In the middle of the rubber pressing plate upper half 1, a rubber mounting block mounting hole 1.1 is provided, and the rubber pressing plate upper half 1 is inserted into the rubber mounting block 2.1 of the rubber pressing plate lower half 2 through the rubber mounting block mounting hole 1.1. The rubber pressing plate upper half 1 is provided with an extrusion structure upper half 1.3, and the rubber pressing plate lower half 2 is provided with an extrusion structure lower half 2.3. The extrusion structure is a groove shape that can fully extrude the upper and lower surfaces of the first sealing rubber 5 and the second sealing rubber 6. At the same time, the expansion amount of the first sealing rubber 5 and the second sealing rubber 6 is controlled by adjusting the extrusion depth.

[0049] Figure 5A and Figure 5B The figure shows the assembly relationship among the rubber pressure plate upper half 1, the rubber pressure plate lower half 2, the first sealing rubber 5 and the second sealing rubber 6 in the state where the first hexagonal bolt 3 and the second hexagonal bolt 4 are not tightened.

[0050] Step 4: Use the first hexagonal bolt 3 to connect the upper half 1 of the rubber pressure plate and the lower half 2 of the rubber pressure plate. By adjusting the screw-in depth of the first hexagonal bolt 3, the extrusion depth of the upper half 1 of the rubber pressure plate and the lower half 2 of the rubber pressure plate can be controlled to indirectly control the expansion amount of the first sealing rubber 5 and the second sealing rubber 6, so as to seal the steam leakage position at the end of the turbine cylinder by relying on the contact pressure between the first sealing rubber 5 and the second sealing rubber 6 and the cylinder body.

[0051] Specifically, combined Figure 6 Description: The rubber pressing plate upper half 1 and the rubber pressing plate lower half 2 are assembled and connected with the first hexagonal bolt 3. The extrusion depth between the extrusion structure upper half 1.3 of the rubber pressing plate upper half 1 and the extrusion structure lower half 2.3 of the rubber pressing plate lower half 2 is controlled by adjusting the screwing depth of the first hexagonal bolt 3, and the expansion amount of the first sealing rubber 5 and the second sealing rubber 6 is indirectly controlled, so that there is contact pressure between the first sealing rubber 5 and the second sealing rubber 6 and the cylinder body. At the same time, the entire device is fixed by the contact pressure of the first sealing rubber 5 and the second sealing rubber 6 around the cylinder body.

[0052] Step 5: Install the second hexagonal bolt 4 on the second mounting hole to connect the upper half 1 of the rubber pressure plate and the lower half 2 of the rubber pressure plate laterally.

[0053] Combination Figure 6 , 4A to 4D Instructions: The sealing rubber limiting structure 2.2 of the lower half 2 of the rubber pressure plate is connected to the upper half 1 of the rubber pressure plate by the side connecting second hexagonal bolt 4. The sealing rubber limiting structure 2.2 limits the expansion and deformation of the tail of the first sealing rubber 5 and the second sealing rubber 6, so that the first sealing rubber 5 and the second sealing rubber 6 expand toward the cylinder body, thereby ensuring the sealing effect.

[0054] The above-mentioned embodiments of the present application do not change the original structure of the turbine cylinder when in use, and there is no need to open the turbine cylinder and dismantle it. After the unit is shut down to clean the steam leakage area, the external sealing device 7 is installed to the steam leakage position of the cylinder. The upper and lower halves of the external sealing device 7 (i.e., the upper half 1 of the rubber pressure plate and the lower half 2 of the rubber pressure plate) can squeeze and deform the internal rubber parts of the external sealing device 7 (i.e., the first sealing rubber 5 and the second sealing rubber 6), and form a certain pressure at the contact position of the cylinder surface to ensure sealing. The external sealing device 7 matches the size of the installation position, and the internal rubber parts are slightly larger than the size of the cylinder installation position. After the rubber is deformed, it can fit tightly with the cylinder wall at the steam leakage defect position to achieve a plugging effect.

[0055] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0056] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the term "comprising" only indicates that the steps and elements that have been clearly identified are included, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0057] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0058] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An external plugging device for steam leakage at the end of a steam turbine cylinder, characterized in that: It includes an upper rubber pressure plate, a lower rubber pressure plate, a first hexagonal bolt, a second hexagonal bolt, a first sealing rubber and a second sealing rubber. Among them, the outer dimensions of the first sealing rubber and the second sealing rubber match the outer dimensions of the space of the cylinder steam leakage position; the second sealing rubber and the first sealing rubber are used to be stacked and installed on the lower half of the rubber pressure plate in sequence, and the upper half of the rubber pressure plate is used to be installed on the first sealing rubber; the upper half of the rubber pressure plate and the lower half of the rubber pressure plate are both provided with a first mounting hole; the first hexagonal bolt is used to be installed on the first mounting hole to connect the upper half of the rubber pressure plate and the lower half of the rubber pressure plate from top to bottom; the side of the lower half of the rubber pressure plate is provided with a second mounting hole; the second hexagonal bolt is used to be installed on the second mounting hole to connect the upper half of the rubber pressure plate and the lower half of the rubber pressure plate from the side.

2. The external plugging device for steam leakage at the end of a steam turbine cylinder according to claim 1, characterized in that: The upper half of the rubber pressure plate includes a bolt mounting plate and an upper half of an extrusion structure. A rubber mounting block mounting hole is provided on the side of the upper half of the extrusion structure away from the bolt mounting plate; the rubber mounting block mounting hole is used to install the lower half of the rubber pressure plate; the bolt mounting plate is used to install the first hexagonal bolt.

3. The external plugging device for steam leakage at the end of a steam turbine cylinder according to claim 2, characterized in that: The upper half of the extrusion structure has a four-sided groove shape and is in direct contact with the upper surface of the first sealing rubber.

4. An external plugging device for steam leakage at the end of a steam turbine cylinder according to any one of claims 1 to 3, characterized in that: The lower half of the rubber pressure plate includes a rubber mounting block, a sealing rubber limiting structure and a lower half of the extrusion structure; the rubber mounting block is the installation position of the first sealing rubber and the second sealing rubber, and is used to limit the front, back, left and right positions of the first sealing rubber and the second sealing rubber; the sealing rubber limiting structure is used to limit the expansion and deformation of the tail of the sealing rubber.

5. The external plugging device for steam leakage at the end of a steam turbine cylinder according to claim 4, characterized in that: The first sealing rubber and the second sealing rubber have a square hole in the middle that is consistent with the shape and size of the rubber mounting block on the lower half of the rubber pressing plate; the second sealing rubber and the first sealing rubber penetrate into the rubber mounting block on the lower half of the rubber pressing plate through the square hole in the middle.

6. The external plugging device for steam leakage at the end of a steam turbine cylinder according to claim 4, characterized in that: The sealing rubber limiting structure is provided with an oblong hole, and the oblong hole is used for installing the second hexagonal bolt.

7. The external plugging device for steam leakage at the end of a steam turbine cylinder according to claim 4, characterized in that: The lower half of the extrusion structure has a four-sided groove shape and is in direct contact with the lower surface of the second sealing rubber.

8. An external plugging method for steam leakage at the end of a steam turbine cylinder, characterized in that: The method is realized by using an external plugging device for steam leakage at the end of a steam turbine cylinder according to any one of claims 1 to 7, comprising: The second sealing rubber and the first sealing rubber are sequentially stacked and installed on the lower half of the rubber pressing plate; After the first and second sealing rubbers are installed, place the lower half of the rubber pressure plate on the steam leakage position of the cylinder joint surface, and adjust the upper and lower positions of the lower half of the rubber pressure plate so that the first and second sealing rubbers are completely in contact with the steam leakage position of the cylinder; Install the upper half of the rubber pressure plate on the first sealing rubber; The first hexagonal bolt is used to connect the upper half of the rubber pressing plate and the lower half of the rubber pressing plate, and the extrusion depth of the upper half of the rubber pressing plate and the lower half of the rubber pressing plate is controlled by adjusting the screwing depth of the first hexagonal bolt, so as to indirectly control the expansion amount of the first sealing rubber and the second sealing rubber, so as to seal the steam leakage position of the turbine cylinder end by relying on the contact pressure between the first sealing rubber and the second sealing rubber and the cylinder body; Install the second hexagonal bolt on the second mounting hole to connect the upper half of the rubber pressure plate and the lower half of the rubber pressure plate laterally.

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