JP3880215B2 - Foreign matter prevention stopper at the opening of the plant - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foreign matter mixing prevention stopper for preventing dust, tools, people and the like from entering through an opening when performing construction, inspection, repair, etc. of power generation equipment and other various plants.
[0002]
[Prior art]
The overhaul of the steam turbine at the power plant is carried out for each of the upper half, the lower half and the rotor of the casing with the upper half of the casing of the steam turbine opened and the rotor taken out. In this case, there are many steam outlets on the inner wall of the lower half of the passenger compartment, and when an operator inspects the lower half of the passenger compartment, dust or tools can be dropped into the opening, In the case of a large opening, there is a risk that the operator himself falls into the opening. Also, in the inspection of piping connected to the turbine, if an intermediate portion of the piping is opened, dust and the like may be sucked into the piping from the vacant portion. Therefore, when disassembling and inspecting these turbines and pipes, it is necessary to close the openings so that foreign matter does not enter the interior.
[0003]
Conventionally, an inspection operation is performed by covering the opening with a lid made of a metal plate and fastening the periphery with a gummed tape.
[0004]
[Problems to be solved by the invention]
The lid made of metal plate is heavy, so it was difficult to carry and handle. Also, when the metal plate was removed, the glue of the gum tape remained on the entrance end face of the opening, and it took time and effort to remove it.
[0005]
The present invention is intended to solve the problems in the prior art and to provide a foreign matter prevention stopper that is easy to handle and can be installed and closed in an opening without using a gummed tape.
[0006]
[Means for Solving the Problems]
According to the present invention, a cavity is formed in a size that can be taken in and out of the opening of the plant in a contracted state, and a cavity sealed with the outside is formed inside, and fluid is injected into or discharged from the cavity. A main body portion formed of an elastic body that expands or contracts in the radial direction of the opening portion, and is formed to protrude outward in the radial direction of the main body portion at an upper portion of the main body portion, and the main body portion is accommodated in the opening portion. In this state, the support portion is formed so as to protrude outward from the diameter of the opening portion, and communicates with the cavity of the main body portion, and the main body portion is accommodated in the opening portion in the cavity of the main body portion. A plate-like member having a diameter larger than that of the opening , wherein the support portion is attached to an upper surface of the main body portion , and includes a fluid injection / discharge port for injecting fluid from the outside or discharging fluid from the cavity to the outside in the configuration, and contracting the body portion In this state, the main body is accommodated in the opening, the support is brought into contact with the inlet end surface of the opening, and the main body is locked near the inlet in the opening. by injecting a fluid into the cavity from the outlet, and the body portion is expanded in a radial direction of the opening, and closes the opening peripheral surface of the main body portion is in close contact with the inner wall surface of the opening The body portion acts to push up the support portion by the pressure in the cavity, and the fluid in the cavity is discharged to the outside from the fluid injection / discharge port, so that the body portion contracts in the radial direction of the opening portion. The main body can be removed from the opening away from the inner wall surface of the opening.
[0007]
According to this invention, since the main body is made of an elastic body such as rubber having a cavity formed therein, it can be configured to be lighter than a conventional lid made of a metal plate, and can be carried and detached. Is easy to handle. Moreover, it can be installed in the opening without using a gummed tape.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. In FIG. 1, the foreign matter mixing prevention stopper 10 includes a main body portion 12 and a support portion 14. The main body 12 is formed in a cylindrical bag body of a sheet-like nylon cloth-drawn chlorobrene rubber having a thickness of about 1 mm, and a cavity 16 is formed inside. The support part 14 is made of a plate-like nylon cloth-drawn chlorobrene rubber having a thickness of about 3 to 5 mm or the like in a disc shape. The upper surface of the main body portion 12 is joined to the lower surface of the support portion 14 with an adhesive or the like with the central axis aligned. The outer peripheral part of the support part 14 projects outward from the main body part 12 to form a projecting part 14a. In the cavity 16, a plurality of narrow belt-like suspension cloths 18 made of nylon or the like are arranged at equal intervals around the central axis of the cavity 16 at a radial position that is ½ the inner diameter of the cavity 16. The book (eight in the example of FIG. 1) is suspended vertically and is connected between the upper and lower end faces of the cavity 16. The length in the vertical direction of the hanging cloth 18 is about the height in the vertical direction of the cavity 16 when the inside of the cavity 16 is in the atmospheric pressure state.
[0009]
An air inlet / outlet nozzle 20 made of chlorobrene rubber or the like is attached to the upper surface of the support portion 14 as a fluid injection / discharge port. The lower end portion of the nozzle 20 passes through the support portion 14 and communicates with the cavity 16. A valve 26 similar to the valve of an automobile tire is attached to the injection / discharge port at the tip of the nozzle 20. A cloth handle 22 made of nylon or the like is attached to a position near the center of the upper surface and the outer periphery of the upper surface of the support portion 14.
[0010]
FIG. 2 shows a usage state of the foreign matter mixing prevention stopper 10 of FIG. The opening 24 is, for example, a steam outlet formed in the lower half of the casing of the steam turbine. When attaching the foreign matter mixing prevention stopper 10 to the opening 24, the air in the cavity 16 is removed, and the main body 12 is accommodated in the opening 24 with the handle 22 as shown in FIG. (The outer diameter of the main body 12 is made slightly smaller than the diameter of the opening 24). At this time, the lower surface of the overhanging portion 14a outside the support portion 14 comes into contact with the outlet end surface 24b of the opening 24, and the foreign matter mixing prevention stopper 10 is locked.
[0011]
In this state, when air is injected from the nozzle 20 into the cavity 16, the main body portion 12 swells to a state shown in FIG. That is, the outer peripheral surface 12a of the main body 12 is in close contact with the inner wall surface 24a of the opening 24 and closes the opening 24 with air pressure. In this state, the lower half of the steam turbine casing can be inspected. When the main body portion 12 swells, the air pressure that pushes upward also acts on the support portion 14, so that it is safe even if a person rides on the support portion 14 to work. In addition, since the hanging cloth 18 is connected between the upper and lower end surfaces in the cavity 16, the main body portion 12 is restricted from being expanded in the vertical direction, and the expansion force in the radial direction is increased. The adhesion force between the outer peripheral surface 12a of the portion 12 and the inner wall surface 24a of the opening 24 becomes strong, and the support force against the load applied to the support portion 14 from above is improved.
[0012]
After the inspection is completed, the air is removed from the nozzle 20 to remove the close contact between the outer peripheral surface 12a of the main body 12 and the inner wall surface 24a of the opening 24, and the foreign matter prevention stopper 10 can be pulled up with the handle 22 and removed. it can.
[0013]
In addition, when not in use, as shown in FIG. 3, the volume of the main body 12 can be reduced in the vertical direction by sufficiently extracting the air in the cavity 16 (the suspended cloth 18 is made of cloth and is compressed). Storage and transportation will be easier. In addition, the outer peripheral surface 12a of the main-body part 12 can also be made into a bellows structure, and can make it easy to shorten in the axial direction.
[0014]
In addition, although the support part 14 was comprised in plate shape in the said embodiment, it is not restricted to this. That is, any structure may be used as long as it can abut against the inlet end face of the opening and lock the main body near the inlet in the opening. Further, the support portion is not limited to an elastic body such as rubber, but may be formed of plastic or the like. In addition, instead of the main body 12 alone forming a sealed cavity with the outside, the upper surface of the main body 12 is opened, and the support portion 14 is hermetically joined to the open end to be sealed from the outside. A cavity can also be constructed.
[0015]
The foreign matter mixing prevention stopper of the present invention can also be used to close an opening of a pipe or the like. It can also be used in plants other than power generation facilities.
[Brief description of the drawings]
FIG. 1 is a plan view and a partial sectional front view showing an embodiment of the present invention.
FIG. 2 is a front view showing a usage state of the foreign matter mixing prevention stopper of FIG.
3 is a front view showing a state when the foreign matter mixing prevention stopper of FIG. 1 is not used. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Foreign matter prevention stopper 12 Main-body part 12a The outer peripheral surface 14 of a main-body part Support part 16 Cavity 18 Hanging cloth (regulation member)
20 Air inlet / outlet nozzle (fluid inlet / outlet, nozzle with valve)
22 Handle 24 Opening 24a Inner Wall 26 Valve of Opening

Claims (6)

A cavity that is formed in a size that can be inserted into and removed from the opening of the plant in a contracted state and that is sealed from the outside is formed, and fluid is injected into or discharged from the cavity. A main body composed of an elastic body that expands or contracts in the radial direction;
A support portion formed on the upper portion of the main body portion so as to protrude outward in the radial direction of the main body portion, and formed so as to protrude outward from the diameter of the opening portion in a state where the main body portion is accommodated in the opening portion; ,
A fluid injecting and discharging port that communicates with the cavity of the main body, injects fluid from the outside into the cavity of the main body while the main body is accommodated in the opening, or discharges fluid from the cavity to the outside; And
The support part is attached to the upper surface of the main body part, and is composed of a plate-like member having a diameter larger than that of the opening part,
The main body is accommodated in the opening in a contracted state, the support is brought into contact with the inlet end surface of the opening, and the main body is locked near the inlet in the opening. By injecting fluid into the cavity from the fluid injection / discharge port in the state, the main body portion expands in the radial direction of the opening portion, and the outer peripheral surface of the main body portion closely contacts the inner wall surface of the opening portion. The body portion closes the opening and the body portion acts to push up the support portion by the pressure in the cavity, and the fluid in the cavity is discharged to the outside from the fluid injection / discharge port, whereby the body portion is opened to the opening. A foreign matter mixing prevention stopper for an opening portion of a plant configured to be contracted in a radial direction of the portion and separated from an inner wall surface of the opening portion so that the main body portion can be taken out from the opening portion. The foreign matter mixing prevention stopper of the opening part of the plant of Claim 1 with which the said main-body part is comprised with the bag body made from cloth drawing rubber formed in columnar shape. The foreign matter mixing prevention stopper of the opening part of the plant of Claim 1 or 2 with which the regulating member which regulates the expansion | swelling of the axial direction of this cavity is connected between the axial direction upper and lower both end surfaces of the cavity of the said main-body part. The foreign matter mixing prevention stopper of the opening part of the plant of Claim 3 with which the said control member is comprised with the cloth body. The foreign matter mixing prevention stopper of the opening part of the plant in any one of Claim 1 to 4 with which the handle is attached to the upper surface of the said support part. The foreign matter mixing prevention stopper of the opening part of the plant in any one of Claim 1 to 5 comprised with the nozzle body with a valve | bulb which the said fluid injection / discharge port is connected to the said cavity and protrudes above the said support part.

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