Expansion plug for sealing of steam turbine cylinder pipe orifice in hydrostatic test

Abstract

The utility model belongs to the technical field of machining, and particularly relates to a steam turbine cylinder pipe orifice water pressure test sealing expansion plug which comprises an expansion plug body and a pipe orifice, the expansion plug body is inserted into the pipe orifice and comprises a blocking plate, pressing plates are arranged on the left side and the right side of the bottom of the blocking plate respectively, and the left side and the right side of the bottom of the blocking plate are provided with clamping grooves. The pressing plates and the blocking plate are installed through first connecting assemblies, the opposite sides of the two pressing plates are fixedly connected with base plates, and the base plates and the blocking plate are installed through second connecting assemblies. Due to the fact that the O-shaped sealing ring seals the gap between the blocking plate and the inner wall of the pipe opening, the blocking plate can only move outwards in the test process, external force is transmitted to the taper plate through the base plate, the taper plate transmits force to the barb block through the outer conical face, and the clamping force between the thorn tip of the barb block and the inner wall of the pipe opening bears the hydraulic test pressure. Therefore, the purpose of sealing the pipe orifice without welding a steel plate on the end face of the pipe orifice is achieved, and the problem of high cost for processing a pipe orifice welding steel plate during a water pressure test of a steam turbine cylinder is solved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing technology, specifically to an expansion plug for sealing the water pressure test port of a steam turbine cylinder. Background Technology

[0002] The turbine cylinder is one of the core components of a steam turbine, responsible for containing and guiding the flow of steam and providing rotational mechanical energy. Through its interaction with the turbine blades, it converts the thermal and pressure energy of the steam into mechanical energy, driving equipment such as generators. The cylinder is the foundation of the entire steam turbine structure and plays a crucial role in the turbine's operating efficiency and stability.

[0003] Steam turbine cylinders are sealing components, and after precision machining, they must undergo a hydrostatic test to verify the machining accuracy and the quality of castings and weldments. During the hydrostatic test, since there are no flanges at the inlet and outlet steam pipes, steel plates are welded to the pipe ends for sealing. After the test, the steel plates are machined off. However, because steam turbine cylinders are large components, machining the pipe end steel plates requires a gantry milling machine, which is time-consuming, labor-intensive, and expensive. Therefore, to address these issues, a sealing plug for the steam turbine cylinder pipe ends during hydrostatic testing is proposed. Utility Model Content

[0004] To overcome the shortcomings of existing technologies and solve the problems of high processing costs for pipe sealing and pipe welding steel plates during steam turbine cylinder hydrostatic testing, this utility model proposes an expansion plug for sealing steam turbine cylinder pipe inlet hydrostatic testing.

[0005] The technical solution adopted by this utility model to solve its technical problem is: the expansion plug for sealing the water pressure test of the steam turbine cylinder port of this utility model includes an expansion plug body and a pipe port, wherein the expansion plug body is inserted into the inside of the pipe port;

[0006] The expansion plug body includes a plug plate, and pressure plates are provided on both the left and right sides of the bottom of the plug plate. The pressure plates are installed to the plug plate through a connecting component one. A pad is fixedly connected to one side of each of the two pressure plates. The pad is installed to the plug plate through a connecting component two. An O-ring is sleeved on the outer surface of the plug plate. The O-ring is located between the plug plate and the pressure plate.

[0007] Both of the pads have a tapered plate at their bottom. A flange is mounted on the bottom of the tapered plate via an installation assembly. Snap-fit ​​assemblies are provided on both the left and right sides of the tapered plate, and the snap-fit ​​assemblies are located between the flange and the tapered plate.

[0008] Preferably, the snap-fit ​​assembly includes mounting grooves on the left and right sides of the tapered plate, with barbs slidably connected inside the mounting grooves. Slots are provided on both the left and right sides of the top of the flange, with the bottom of the barbs inserted into the slots. A tension spring passes through the outer surface of the barbs, and the barbs are fixedly installed to the tapered plate by the tension spring.

[0009] Preferably, the connecting component one includes a hexagonal head screw that penetrates the interior of the pressure plate, and the top end of the hexagonal head screw is threaded to the interior of the plug plate.

[0010] Preferably, the second connecting component includes a second hexagonal head screw that penetrates the interior of the pad, and the top end of the second hexagonal head screw is threaded into the interior of the plug plate.

[0011] Preferably, the mounting assembly includes mounting holes on the left and right sides inside the flange, with hexagonal bolts passing through the mounting holes, and the top of the hexagonal bolts being threaded into the tapered plate.

[0012] Preferably, it also includes a guide assembly, which includes a guide rod fixedly connected to the center of the top of the flange, a guide hole opened at the center of the bottom of the tapered plate, a guide block slidably connected inside the guide hole, and the bottom of the guide block being fixedly connected to the top of the guide rod.

[0013] Preferably, it also includes a reinforcement component, which includes a groove formed on the side of the pad, and a reinforcing pad is fixedly connected inside the groove, the outer surface of the reinforcing pad being in contact with the inner wall of the pipe opening.

[0014] Preferably, the reinforcing pad is made of rubber.

[0015] The advantages of this utility model are:

[0016] 1. This utility model uses an O-ring seal to seal the gap between the plug plate and the inner wall of the pipe opening. During the test, the plug plate can only move outward. The external force is transmitted to the tapered plate through the pad, and the tapered plate transmits the force to the barb block through the outer tapered surface. The clamping force between the barb tip and the inner wall of the pipe opening bears the water pressure test pressure, thereby achieving the purpose of sealing the pipe opening without welding a steel plate to the end face of the pipe opening, solving the problem of high cost of machining and welding steel plates for the pipe opening during the water pressure test of the steam turbine cylinder.

[0017] 2. This utility model guides the movement of the flange through the sliding connection of the guide block, guide rod, and guide hole, making the flange movement more stable. When the flange is installed, the guide block and guide rod are inserted into the guide hole to facilitate the guiding installation and connection between the flange and the tapered plate, thus making the flange connection and installation simpler and faster. At the same time, the rubber reinforcing pad has a good anti-slip effect and a good fit between the reinforcing pad and the inner wall of the pipe opening, thereby strengthening the connection between the pad and the inner wall of the pipe opening, and strengthening the connection between the expansion plug and the pipe opening. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a partial cross-sectional view of the structure in Example 1;

[0020] Figure 2 This is a partial cross-sectional view of the guide component in Embodiment 2;

[0021] Figure 3 This is a partial cross-sectional view of the reinforcement component in Embodiment 2;

[0022] Figure 4 As in Example 2 Figure 3 Enlarged structural diagram at point A in the middle.

[0023] In the diagram: 1. Blocking plate; 2. Pressure plate; 3. Socket head cap screw 1; 4. Socket head cap screw 2; 5. Washer plate; 6. Tapered plate; 7. Hex bolt; 8. Flange; 9. O-ring seal; 10. Barbed block; 11. Tension spring; 12. Pipe opening; 13. Guide hole; 14. Guide rod; 15. Guide block; 16. Groove; 17. Reinforcing and stabilizing pad. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] Please see Figure 1 As shown, an expansion plug for sealing a steam turbine cylinder port water pressure test includes an expansion plug body and a port 12, wherein the expansion plug body is inserted into the port 12.

[0027] The expansion plug body includes a plug plate 1. Pressure plates 2 are provided on both the left and right sides of the bottom of the plug plate 1. The pressure plates 2 are installed to the plug plate 1 through a connecting component one. A pad 5 is fixedly connected to the opposite side of the two pressure plates 2. The pad 5 is installed to the plug plate 1 through a connecting component two. An O-ring 9 is sleeved on the outer surface of the plug plate 1. The O-ring 9 is located between the plug plate 1 and the pressure plates 2.

[0028] Both gaskets 5 have a tapered plate 6 at their bottom. A flange 8 is mounted on the bottom of the tapered plate 6 via an installation assembly. Snap-fit ​​assemblies are located on both sides of the tapered plate 6, between the flange 8 and the tapered plate 6. During operation, the O-ring 9 is first placed on the plug plate 1, then inserted into the cylinder port 12. Next, the pressure plate 2 is pressed down using the first connecting assembly, causing the O-ring 9 to deform and seal the plug plate 1 against the inner wall of the port 12. Then, the gasket 5 is mounted on the end face of the plug plate 1 via the second connecting assembly, and the flange 8 is installed on the tapered plate 6 using the installation assembly. Finally, the plug plate 1 and pressure plate 2, and the gasket 5 and tapered plate 6 are assembled together. The inlet 12 is then inserted into the cylinder. Under the pressure of the flange 8 pressing the tapered plate 6, the clamping assembly is clamped onto the inner wall of the inlet 12. At this time, water is injected into the cylinder cavity. The water pressure reaches the end face of the plug plate 1. Since the O-ring 9 seals the gap between the plug plate 1 and the inner wall of the inlet 12, the plug plate 1 can only move outward. The external force is transmitted to the tapered plate 6 through the pad 5. The tapered plate 6 then transmits the force to the clamping assembly through the outer tapered surface. The clamping force between the clamping assembly and the inner wall of the inlet 12 bears the water pressure test pressure, thereby achieving the purpose of sealing the inlet 12 without welding a steel plate to the end face of the inlet 12, solving the problem of high cost of machining and welding steel plates for the inlet 12 during the water pressure test of the turbine cylinder.

[0029] The snap-fit ​​assembly includes mounting grooves on the left and right sides of the tapered plate 6. A barb block 10 is slidably connected inside the mounting groove. Slots are provided on the left and right sides of the top of the flange 8. The bottom of the barb block 10 is inserted into the slot. A tension spring 11 passes through the outer surface of the barb block 10. The barb block 10 is fixedly installed to the tapered plate 6 by the tension spring 11. During operation, the tension spring 11 causes the barb block 10 to be installed between the tapered plate 6 and the flange 8. Under the pressure of the flange 8 moving and pressing against the tapered plate 6, the diameter of the barb block 10 expands and it snaps onto the inner wall of the pipe opening 12. This allows the expansion plug to snap into the inside of the pipe opening 12.

[0030] The connecting component includes a hexagonal head screw 3 that penetrates the interior of the pressure plate 2. The top of the hexagonal head screw 3 is threaded to the interior of the plug plate 1. During operation, the hexagonal head screw 3 facilitates the connection and installation between the pressure plate 2 and the plug plate 1.

[0031] The second connecting component includes a hexagonal head screw 4 that penetrates the interior of the pad 5. The top of the hexagonal head screw 4 is threaded to the interior of the plug 1. During operation, the hexagonal head screw 4 facilitates the connection and installation of the pad 5 and the plug 1.

[0032] The mounting assembly includes mounting holes on the left and right sides inside the flange 8. Hex bolts 7 pass through the mounting holes, and the top of the hex bolts 7 is threaded to the inside of the tapered plate 6. During operation, the flange 8 and the tapered plate 6 are connected and installed by the hex bolts 7 passing through the mounting holes and threaded to the tapered plate 6, which facilitates the installation and connection between the flange 8 and the tapered plate 6.

[0033] Example 2

[0034] Please see Figure 2-4 As shown in the comparative embodiment one, as another implementation of this utility model, it also includes a guide assembly. The guide assembly includes a guide rod 14 fixedly connected to the center of the top of the flange 8, and a guide hole 13 opened at the center of the bottom of the tapered plate 6. A guide block 15 is slidably connected inside the guide hole 13, and the bottom of the guide block 15 is fixedly connected to the top of the guide rod 14. During operation, the sliding connection between the guide block 15, the guide rod 14, and the guide hole 13 can guide the movement of the flange 8, making the movement of the flange 8 more stable. At the same time, when installing the flange 8, the guide block 15 and the guide rod 14 are inserted into the guide hole 13 to facilitate the guiding installation and connection between the flange 8 and the tapered plate 6, thereby making the connection and installation of the flange 8 simpler and faster.

[0035] It also includes a reinforcement component, which includes a groove 16 formed on the side of the pad 5. A reinforcing and stabilizing pad 17 is fixedly connected inside the groove 16. The outer surface of the reinforcing and stabilizing pad 17 is in contact with the inner wall of the pipe opening 12. During operation, the reinforcing and stabilizing pad 17 inside the groove 16 reinforces the connection between the pad 5 and the inner wall of the pipe opening 12, and also reinforces the connection between the expansion plug and the pipe opening 12.

[0036] The reinforcing and stabilizing pad 17 is made of rubber. During operation, the rubber reinforcing and stabilizing pad 17 has a good anti-slip effect and makes the reinforcing and stabilizing pad 17 fit well with the inner wall of the pipe opening 12, thereby strengthening the connection between the pad 5 and the inner wall of the pipe opening 12, and strengthening the connection between the expansion plug and the pipe opening 12.

[0037] Working principle: First, place the O-ring 9 onto the plug plate 1, then insert it into the cylinder port 12. Next, use the first hexagon head screw 3 to tighten the pressure plate 2, deforming the O-ring 9 to seal the plug plate 1 against the inner wall of the port 12. Then, install the gasket 5 on the end face of the plug plate 1 using the second hexagon head screw 4. Tighten the inner hole of the barb 10 against the tapered plate 6, and use the tension spring 11 to tighten the barb 10, making the barb 10 and the tapered plate 6 a single unit. Then, install the flange 8 using hexagon bolts 7. After installation, insert the integrated components into the port 12, ensuring the end face of the tapered plate 6 is flush with the end face of the gasket 5. Finally, tighten the hexagon bolts 7. Under the pressure of the flange 8 pressing the tapered plate 6, the diameter of the barb 10 expands and it gets stuck on the inner wall of the pipe opening 12. At this time, water is injected into the cylinder cavity, and the water pressure reaches the end face of the plug plate 1. Since the O-ring seal 9 seals the gap between the plug plate 1 and the inner wall of the pipe opening 12, the plug plate 1 can only move outward. The external force is transmitted to the tapered plate 6 through the pad 5. The tapered plate 6 then transmits the force to the barb 10 through the outer conical surface. The clamping force between the barb tip of the barb 10 and the inner wall of the pipe opening 12 bears the water pressure test pressure, thereby achieving the purpose of sealing the pipe opening 12 without welding a steel plate to the end face of the pipe opening 12, solving the problem of high cost of machining and welding steel plates for the pipe opening 12 during the water pressure test of the turbine cylinder.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An expansion plug for sealing a steam turbine cylinder port during a hydrostatic test, comprising an expansion plug body and a port (12), wherein the expansion plug body is inserted into the port (12); Its features are: The expansion plug body includes a plug plate (1), and pressure plates (2) are provided on both the left and right sides of the bottom of the plug plate (1). The pressure plates (2) are installed with the plug plate (1) through a connecting component one. A pad (5) is fixedly connected to one side of each of the two pressure plates (2). The pad (5) is installed with the plug plate (1) through a connecting component two. An O-ring (9) is sleeved on the outer surface of the plug plate (1). The O-ring (9) is located between the plug plate (1) and the pressure plates (2). The bottom of the two pads (5) is provided with a tapered plate (6). The bottom of the tapered plate (6) is equipped with a flange (8) by means of an installation component. The left and right sides of the tapered plate (6) are provided with snap-fit ​​components, which are located between the flange (8) and the tapered plate (6).

2. The expansion plug for sealing the hydrostatic test of a steam turbine cylinder inlet according to claim 1, characterized in that: The snap-fit ​​assembly includes mounting grooves on the left and right sides of the tapered plate (6), with barbs (10) slidably connected inside the mounting grooves. Slots are provided on the left and right sides of the top of the flange (8). The bottom of the barbs (10) is inserted into the slots. A tension spring (11) runs through the outer surface of the barbs (10). The barbs (10) are fixedly installed to the tapered plate (6) by the tension spring (11).

3. The expansion plug for sealing the water pressure test of a steam turbine cylinder inlet according to claim 2, characterized in that: The connecting component includes a hexagonal head screw (3) that penetrates the interior of the pressure plate (2), and the top of the hexagonal head screw (3) is threaded to the interior of the plug plate (1).

4. The expansion plug for sealing the water pressure test of a steam turbine cylinder inlet according to claim 3, characterized in that: The second connecting component includes a second hexagonal head screw (4) that penetrates the inside of the pad (5), and the top of the second hexagonal head screw (4) is threaded to the inside of the plug plate (1).

5. The expansion plug for sealing the hydraulic pressure test of a steam turbine cylinder inlet according to claim 4, characterized in that: The mounting assembly includes mounting holes on the left and right sides inside the flange (8), through which a hexagonal bolt (7) passes, and the top of the hexagonal bolt (7) is threaded to the inside of the tapered plate (6).

6. The expansion plug for sealing the hydrostatic test of a steam turbine cylinder inlet according to claim 5, characterized in that: It also includes a guide assembly, which includes a guide rod (14) fixedly connected to the center of the top of the flange (8), a guide hole (13) is provided at the center of the bottom of the tapered plate (6), a guide block (15) is slidably connected inside the guide hole (13), and the bottom of the guide block (15) is fixedly connected to the top of the guide rod (14).

7. The expansion plug for sealing the hydrostatic test of a steam turbine cylinder inlet according to claim 6, characterized in that: It also includes a reinforcement component, which includes a groove (16) formed on the side of the pad (5), and a reinforcing pad (17) is fixedly connected inside the groove (16), the outer surface of the reinforcing pad (17) being in contact with the inner wall of the pipe opening (12).

8. The expansion plug for sealing the hydrostatic test of a steam turbine cylinder inlet according to claim 7, characterized in that: The reinforcing pad (17) is made of rubber.

Images