Plug assembly for mounting bolt hole in upper rack cover plate of mixed-flow unit

Abstract

The utility model provides a plug assembly for a mounting bolt hole of an upper rack cover plate of a mixed-flow unit, which comprises a plug body which is made of rubber and is of a cylinder structure, and the diameter of the plug body is larger than that of a bolt counterbore of the upper rack cover plate. The side wall of the upper rack cover plate bolt counterbore is provided with a dismounting opening extending in the longitudinal direction. During installation, the plug body is pressed into a bolt counterbore with the diameter smaller than that of the plug body, impurities are prevented from entering the plug body, the plug body made of rubber is elastically deformed, on one hand, the sealing effect is achieved, water stains are prevented from entering the plug body, and corrosion of a bolt is delayed; and on the other hand, the plug body is tensioned in the bolt counterbore through the elastic force of the rubber so as to be prevented from falling off. And meanwhile, through the arrangement of the disassembling opening, the plug body can be pried out through a pinch bar when being disassembled, and compared with the mode that a protection plate is additionally installed through screws in the prior art, the plug is convenient to disassemble and assemble, safe and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to generating set technical field especially relates to a plug assembly for the installation bolt hole of mixed flow unit upper rack cover plate. BACKGROUND

[0002] In the periodic maintenance operation of the hydroelectric generating set, the dismounting operation of the generator upper rack cover plate is quite frequent. In the traditional design, the upper rack cover plate adopts the bolt fastening mode, and at the same time, in order to protect the installation bolt hole and prevent impurities from entering the bolt hole from the bolt countersunk hole, an additional cover plate is installed, which is fixed by four small screws. However, in actual operation, due to the high dismounting frequency, the installation bolt hole cover plate and its fixing screws are often severely worn, especially the damage of the screws, which directly hinders the normal use of the bolt hole cover plate, thereby prolonging the maintenance cycle and increasing unnecessary resource consumption. In severe cases, it may even cause the upper rack cover plate to be unstable, affecting the safe operation of the unit. SUMMARY

[0003] The utility model aims at providing a plug assembly for the installation bolt hole of mixed flow unit upper rack cover plate, which blocks the entry of impurities when in use. Compared with the existing technology of adding a protective plate through screws, the application is convenient to dismount and safe and reliable. In order to achieve the above technical features, the utility model is realized as follows:

[0004] A plug assembly for the installation bolt hole of mixed flow unit upper rack cover plate, comprising a plug body made of rubber and in a cylindrical structure, the diameter of the plug body being greater than the hole diameter of the upper rack cover plate bolt countersunk hole, and a dismounting opening extending along the longitudinal direction being provided on the side wall of the upper rack cover plate bolt countersunk hole.

[0005] When working, the plug body is placed in the upper rack cover plate bolt countersunk hole, and the bottom of the dismounting opening is located between the top and bottom of the plug body.

[0006] The bottom end of the plug body is provided with a guide angle.

[0007] A hole stop ring is provided on the upper rack cover plate bolt countersunk hole near the top end, which is used to limit the plug body.

[0008] A plug assembly for the installation bolt hole of mixed flow unit upper rack cover plate, comprising a plug body in a cylindrical structure, a sealing element being installed on the circumference of the plug body, a handle being provided on the top of the plug body, and the diameter of the plug body being smaller than the hole diameter of the upper rack cover plate bolt countersunk hole.

[0009] The bottom end of the plug body is provided with a guide angle.

[0010] The plug body is made of stainless steel.

[0011] The hole stop ring is arranged on the plug body and is used for limiting the plug body.

[0012] The plug body is made of rubber and has a cylindrical structure.

[0013] 1. The plug body is made of rubber and has a cylindrical structure.

[0014] 2. The plug body and the sealing element are arranged. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model makes further explanation in connection with the drawings and examples.

[0016] Figure 1 The structure diagram of the upper rack cover plate provided by the utility model embodiment is shown.

[0017] Figure 2 The structure diagram of the plug for the bolt hole of the upper rack cover plate of the mixed flow unit provided by the utility model embodiment is shown.

[0018] Figure 3 The installation diagram of the plug for the bolt hole of the upper rack cover plate of the mixed flow unit provided by the utility model embodiment is shown.

[0019] Figure 4A structure schematic view of a plug body of a plug assembly for bolt hole of upper rack cover plate of mixed flow unit is provided for the embodiment of the utility model,

[0020] Figure 5 A mounting structure schematic view of a plug assembly for bolt hole of upper rack cover plate of mixed flow unit is provided for the embodiment of the utility model,

[0021] In the drawing: plug body 1, upper rack cover plate 2, bolt countersunk hole 2a, dismounting opening 2b, hole check ring 3, sealing element 4, handle 5. DETAILED DESCRIPTION

[0022] The embodiment of the utility model is further explained below in combination with the drawings.

[0023] Embodiment 1

[0024] Referring to the drawings, Figures 1-3 A plug assembly for bolt hole of upper rack cover plate of mixed flow unit, including the plug body 1 made of rubber and being cylindrical structure, the plug body 1 diameter is greater than the hole diameter of bolt countersunk hole 2a on the upper rack cover plate 2, the side wall of bolt countersunk hole 2a on the upper rack cover plate 2 is equipped with the dismounting opening 2b extending along the longitudinal direction, when working, the plug body is placed in bolt countersunk hole 2a on the upper rack cover plate 2, and the bottom of the dismounting opening 2b is located between the top and bottom of the plug body 1, so that the plug body 1 below the dismounting opening 2b maintains the sealing property.When installing, the plug body 1 is pressed into the bolt countersunk hole 2a smaller than its diameter, which prevents impurities from entering, makes the plug body made of rubber elastically deformed, on the one hand, plays a sealing role, prevents water from entering and delays the rust of the bolt; on the other hand, the plug body is tightened in the bolt countersunk hole by the rubber elasticity to prevent falling off. At the same time, the dismounting opening 2b is provided to facilitate the use of a pry bar to pry out the plug body 1 when dismounting, compared with the way of adding a protective plate by a screw in the prior art, the application is convenient to dismount, safe and reliable.

[0025] Further, the bottom end of the plug body 1 is provided with a guide angle 1a to facilitate the installation of the plug body 1.

[0026] Further, the bolt countersunk hole 2a of the upper rack cover plate 2 is provided with a hole check ring 3 close to the top end, the hole check ring 3 is used to limit the plug body 1, and then prevent the plug body 1 from falling off from the hole after the tightening force fails.

[0027] Embodiment 2

[0028] Referring to the drawings, Figures 4-5The application discloses a plug assembly for bolt hole of upper bracket cover plate of mixed flow unit, which comprises a plug body 1 in cylindrical structure, a sealing element 4 is installed on the circumference of the plug body 1, a handle 5 is arranged on the top of the plug body 1, and the diameter of the plug body 1 is smaller than the hole diameter of a bolt countersunk hole 2a on the upper bracket cover plate 2. During installation, the plug body 1 is placed into the bolt countersunk hole 2a to prevent impurities from entering, the sealing element 4 is combined with the bolt countersunk hole 2a, which plays a sealing role on one hand and prevents water from entering and delays rusting of the bolt; on the other hand, the plug body is expanded in the bolt countersunk hole through the elastic force of the sealing element to prevent falling; during disassembly, the handle 5 can be clamped by hand or a tool according to the size of the bolt countersunk hole 2a and the plug body 1, so that the plug body can be pulled out, and compared with the existing technology, the application is convenient, safe and reliable.

[0029] Further, the sealing element 4 is an O-shaped ring or a sealing ring.

[0030] Further, a guide angle 1a is arranged at the bottom end of the plug body 1 to facilitate installation of the plug body 1.

[0031] Further, the plug body 1 is made of stainless steel, so that rusting, sticking or corrosion problems are prevented, and cooperation is more stable.

[0032] Further, a hole stop ring 3 is arranged on the bolt countersunk hole 2a of the upper bracket cover plate 2 close to the top end, and the hole stop ring 3 is used for limiting the plug body and preventing falling.

Claims

1. A plug assembly for a bolt hole in a cover plate of a machine frame of a Francis turbine unit, characterized by: The plug body is made of rubber and has a cylindrical structure, and has a diameter greater than that of the bolt countersunk hole of the upper rack cover plate, and a dismounting opening is arranged on the side wall of the bolt countersunk hole and extends along the longitudinal direction. In operation, the plug body is arranged in the bolt countersunk hole of the upper rack cover plate, and the bottom of the dismounting opening is arranged between the top and bottom of the plug body.

2. A cap assembly for a bolt hole of a cover plate of an upper bracket of a Francis turbine unit according to claim 1, characterized in that: The bottom end of the plug body is provided with a guide angle.

3. A Francis turbine upper casing cover plate mounting bolt hole plug assembly according to claim 1, characterized in that: A hole stop ring is arranged on the bolt countersunk hole of the upper rack cover plate and close to the top end, and is used for limiting the plug body.

4. A plug assembly for a cover plate mounting bolt hole of a Francis turbine upper bracket, characterized in that: The plug body has a cylindrical structure, a sealing member is arranged around the plug body, a handle is arranged on the top of the plug body, and the diameter of the plug body is less than that of the bolt countersunk hole of the upper rack cover plate.

5. A closure assembly for a bolt hole in a shroud cover of an upper casing of a Francis turbine unit according to claim 4, characterized in that: The bottom end of the plug body is provided with a guide angle.

6. A cap assembly for a bolt hole of a cover plate of an upper bracket of a Francis turbine unit according to claim 4, characterized in that: The plug body is made of stainless steel.

7. A cap assembly for a bolt hole of a cover plate of an upper bracket of a Francis turbine unit according to claim 4, characterized in that: A hole stop ring is arranged on the bolt countersunk hole of the upper rack cover plate and close to the top end, and is used for limiting the plug body.

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