JP2004156834A - Blowout/suction opening device for air conditioning duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remotely operate opening and closing of a blowout and/or suction opening of an air conditioning duct arranged in a nuclear power plant, to eliminate the need to install a temporary scaffold, and to realize shortening of an inspection process and cost reduction. <P>SOLUTION: In an opening and closing device 1 provided on the blowout and/or suction opening of the air conditioning duct arranged in the nuclear power plant, a plurality of vanes 3A-3C are provided in parallel positions so as to freely rotate around longitudinal axes at predetermined intervals in an interior of a casing frame 2 provided on the blowout and/or suction opening, the vanes 3A-3C can be synchronously operated by linkages 4A and 4B using an air cylinder 5 as a driving source, and the blowout and/or suction opening can be freely opened and closed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air outlet / inlet device provided at an air outlet and / or an air inlet of an air conditioning duct provided in a nuclear power plant and capable of being opened and closed from a remote position.
[0002]
[Prior art]
At nuclear power plants, periodic inspections of turbines are required to ensure safety.At that time, iodine, which is a harmful substance, is discharged from the air outlet and air inlet of the air conditioning duct by opening the turbine. And may harm workers' health. For this reason, in the past, iron plates were attached to the air outlet and the air inlet of the air-conditioning duct at the time of inspection to prevent the diffusion of iodine by blocking, and the iron plate was removed again after the inspection.
[0003]
[Problems to be solved by the invention]
However, since both the outlet and the inlet to be sealed are located at a height of 10 m or more above the floor, it is necessary to set up a temporary scaffold during the sealing operation. In addition, the temporary scaffold occupies a space, so it has to be dismantled during the periodic inspection, and the temporary scaffold has to be assembled again when the blockade is released. Accordingly, a great deal of labor was required in closing and unblocking the air outlet, and the number of steps for the periodic inspection was increased, and a large construction cost was required for installing and dismantling the temporary scaffold twice. There was a problem.
[0004]
Accordingly, a main problem of the present invention is to make it possible to open and close the air outlet and / or the air inlet of an air conditioning duct provided in a nuclear power plant from a remote position, to eliminate the need for installing a temporary scaffold, and to shorten the inspection process. It is to realize cost reduction.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an outlet / inlet device with an opening / closing mechanism provided at an outlet and / or an inlet of an air conditioning duct provided in a nuclear power plant. A plurality of blade plates are provided at predetermined intervals inside a casing frame provided at the outlet and / or the suction port in a rotatable and parallel arrangement around a longitudinal axis, and these blade plates are linked by an air cylinder as a drive source. Thus, the air outlet and / or the air inlet and the air inlet can be freely opened and closed.
[0006]
According to the first aspect of the present invention, the air outlet and / or the suction port can be freely opened and closed by a blade driven by an air cylinder. Therefore, by operating the air cylinder from a remote position, it is possible to open and close the air outlet and / or the air inlet without installing a temporary scaffold, thereby making it possible to shorten the inspection process and reduce costs. Become.
[0007]
Here, it is conceivable to use an electric motor as a drive source for the blades. However, in the case of an electric motor, maintenance is required about once a year, and a temporary scaffold is required for this maintenance. No reduction in labor can be expected. Further, a method of operating the link mechanism with an operation rod by manual operation is also conceivable, but there is a concern about the reliability of the operation, and there is a possibility that the outlet and / or the inlet cannot be completely closed.
[0008]
On the other hand, when an air cylinder is used as a drive source, it is possible to use compressed air that can be easily secured from all over the nuclear power plant, and it can be used substantially maintenance-free because there are few failures.
[0009]
According to a second aspect of the present invention, there is provided an air-conditioning duct outlet / inlet device according to the first aspect, wherein the air cylinder is an air cylinder with a lock mechanism. If the air cylinder as the driving source has a lock mechanism, even if the supply of compressed air is interrupted, the closed state by the blades is maintained, so that the diffusion of iodine can be reliably prevented.
[0010]
According to a third aspect of the present invention, an indicator needle is provided on a rotation shaft of one of the blades at a side position of the casing frame, and the outlet and / or the outlet are rotated by the swinging position of the indicator with the rotation of the blade. Alternatively, there is provided an air conditioning duct blow-out / suction port device according to any one of claims 1 and 2, further comprising an opening / closing display mechanism that indicates whether the suction port is in an open state or a closed state.
[0011]
According to the third aspect of the present invention, the provision of the opening / closing display mechanism allows an operator or the like to visually confirm the opening / closing state of the blow-out / suction port device at a glance.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is an open front view of an air-conditioning duct outlet / suction port device 1 according to the present invention, FIG. 2 is a view taken along the line II-II, FIG. 3 is a view taken along a line III-III in FIG. 1 is a view taken along the line IV-IV in FIG. 1, and FIG. 5 is a view taken along the line VV in FIG.
[0013]
The blow-out / suction port device 1 is provided at a blow-out port and / or a suction port of an air-conditioning duct arranged in a nuclear power plant, and closes the blow-out port and / or the suction port at the time of a periodic inspection of a turbine or the like, so that iodine is discharged. It is intended to prevent diffusion into the power plant.
[0014]
The blowout / suction port device 1 includes three casings 3A, 3B, and 3C rotatable around a longitudinal axis at upper, middle, and lower positions, respectively, in a casing frame 2 formed in a substantially square shape. The blades 3A, 3B, and 3C are operated in a synchronized manner by link mechanisms 4A and 4B that are driven by air cylinders 5 provided on both side surfaces of the casing frame 2 while being suspended in a parallel arrangement. The outlet and / or the inlet can be opened and closed freely.
[0015]
In more detail below,
The casing frame 2 has a substantially rectangular frame shape. As shown in FIG. 2, a number of fixed wings or movable wings, or a lattice-like face 13 is attached to the indoor surface side, and an inner side thereof is provided. The three blades 3A, 3B, and 3C are provided at upper, middle, and lower positions in a freely rotatable and parallel arrangement around a longitudinal axis. The structure of the blade plate 3A is such that the rotating shaft 8A is rotatably supported by bearings 12 provided on the side surface of the casing frame 2, and the blade plate 3A is integrated with the rotating shaft 8A by welding or the like. A wing plate 3A, which integrally rotates with the rotating shaft 8A, is formed by externally fitting a tubular member 7 provided in a fixed manner, and inserting a bolt 9 passing through both the tubular member 7 and the rotating shaft 8A and tightening with a nut 10. It is to be provided. The middle blade plate 3B and the lower blade plate 3C have the same structure. As the material of the casing frame 2 and the blades 3A to 3C, aluminum or an alloy thereof is preferably used in order to reduce the weight of the entire apparatus.
[0016]
Both ends of the rotating shafts 8A to 8C supporting the blade plates 3A to 3C protrude outward from the side surfaces of the casing frame 2, and the protruding shaft portions 8a to 8f are connected by links 4a to 4g and operate synchronously. It has become.
[0017]
The link mechanism will be described in detail. On the right side of the casing frame 2, as shown in FIGS. 1 and 3, the rear end of the air cylinder 5 is connected to a bracket 11 fixed to the casing frame 2. At the same time, the piston 5a of the air cylinder 5 and the projecting shaft 8a of the upper rotary shaft 8A are connected via the first arm 4a. As shown in FIGS. 1 and 4, the short link 4g connected to the protruding shaft 8e of the middle rotating shaft 8B and the short link 4e connected to the protruding shaft 8d of the lower rotating shaft 8C are long. The first parallel link mechanism 4A is connected by the link 4f. In addition, as the air cylinder 5, it is desirable to use an air cylinder with a lock mechanism capable of holding a supply state of air.
[0018]
On the other hand, on the left side of the casing frame 2, as shown in FIGS. 1 and 5, a short link 4b connected to the protruding shaft 8b of the upper rotating shaft 8A and a protruding shaft 8c of the lower rotating shaft 8C. The second parallel link mechanism 4B is configured by connecting the short link 4d connected to the second link 4d to the long link 4c. An opening / closing indicator 6 is provided on the protruding shaft portion 8f of the middle rotary shaft 8B, and an "S" mark indicating a closed state at each swing position of the opening / closing indicator 6 with the rotation of the blade plate 3. 14a, an "O" mark 14b indicating an open state is affixed so that it can be visually confirmed whether the outlet and / or the inlet is open or closed.
[0019]
In order to change the blades 3A to 3C shown in FIG. 6 from the open state to the closed state, the air cylinder 5 is operated from a remote position to send compressed air and contract, and the upper stage is moved with the swing of the first arm 4a. The rotation shaft 8A rotates, and the upper blade 3A rotates in the closing direction. Next, the rotational force of the upper rotary shaft 8A is transmitted to the lower rotary shaft 8C by the second parallel link mechanism 4B, and the lower blade 8C rotates in the closing direction with the rotation of the lower rotary shaft 8C. Further, the torque of the lower rotating shaft 8C is transmitted to the middle rotating shaft 8B by the first parallel link mechanism 4A, and the middle blade 3B rotates in the closing direction with the rotation of the middle rotating shaft 8B.
[0020]
In the closed state of the blow-out / suction port device 1 shown in FIG. 7, the lower edge of the upper blade 3A, the upper edge of the middle blade 3B, the lower edge of the middle blade 3B, and the upper edge of the lower blade 3C are respectively. The entire opening is closed by overlapping, and the upper edge of the upper blade 3A and the lower edge of the lower blade 3C abut against the solid sealing materials 2a, 2b provided on the inner surface of the casing frame 2. .
[0021]
Also, if a lock mechanism is used as the air cylinder 5, the blades 3A to 3C can maintain the closed state even if the supply of compressed air is stopped. .
[0022]
To end the periodic inspection and return the blow-out / suction port device 1 to the open state, when the air cylinder 5 is operated and extended from a remote position, the blades 3A to 3C rotate in the opening direction. The open state shown in FIG.
[0023]
As described above, the present invention has been described in detail, but various modifications are possible without being limited to the above-described embodiment.
[0024]
(1) In the above embodiment, three blades are used, but the number of blades is arbitrary.
(2) In the above embodiment, the blades are parallel blades rotating in the same direction, but may be counter blades.
(3) In the above embodiment, the three blades are driven by a single air cylinder, but a plurality of air cylinders may be used.
[0025]
【The invention's effect】
As described above in detail, according to the present invention, the air outlet and / or the inlet of the air-conditioning duct provided in the nuclear power plant can be opened and closed from a remote position. Shortening and cost reduction can be realized.
[Brief description of the drawings]
FIG. 1 is an open front view of an air-conditioning duct outlet / suction port device 1 according to the present invention.
FIG. 2 is a view taken along line II-II in FIG.
FIG. 3 is a view taken along line III-III in FIG. 1;
FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 1;
FIG. 5 is a view taken along line VV of FIG. 1;
FIG. 6 is a longitudinal sectional view showing an open state of the outlet / suction port device 1.
FIG. 7 is a longitudinal sectional view showing a closed state of the blow-out / suction port device 1.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Blow-out / suction port device, 2 ... Casing frame, 3A-3C ... Blade plate, 4A ... 1st parallel link mechanism, 4B ... 2nd parallel link mechanism, 5 ... Air cylinder, 6 ... Open / close indication pointer, 7 ... Tube material, 8A to 8C ... rotating shaft

Claims (3)

An outlet / inlet device provided with an opening / closing mechanism provided at an outlet and / or an inlet of an air conditioning duct provided in a nuclear power plant, wherein a predetermined amount is provided inside a casing frame provided at the outlet and / or the inlet. A plurality of blades are provided at intervals in a rotatable and parallel arrangement about a longitudinal axis, and these blades are operatively operated by a link mechanism driven by an air cylinder as a drive source. An air-conditioning duct blow-out / suction port device characterized in that the suction port is freely openable and closable. The air-conditioning duct outlet / suction port device according to claim 1, wherein the air cylinder is an air cylinder with a lock mechanism. In the side surface position of the casing frame, an indicator needle is provided on the rotation axis of one blade plate, and the outlet and / or the suction port is in an open state depending on the swinging position of the indicator needle accompanying the rotation of the blade plate. The air-conditioning duct blow-out / suction port device according to any one of claims 1 and 2, further comprising an open / close display mechanism for indicating whether the air conditioner is in a closed state or not.

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