JP2010065952A - Multidirectional suction mechanism for local exhauster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide decentralization and suction force of connection ducts, meeting needs without changing respective functions, and to effectively prevent scattering of radioactive material due to change of connection portions, in regard to a local exhauster. <P>SOLUTION: In the suction mechanism of the local exhauster, a chamber device 3 is mounted and fixed to an upper part of the local exhauster 1 comprising a substantially box shape, both devices are mutually communicated by a communication hole, and air is sucked via a suction opening into a chamber device side from a local exhauster side and it is exhausted from an exhaust duct 4. Duct suction openings 14 for exhaust duct connection are provided in all faces other than a face of the chamber device contacting the local exhauster 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multi-directional suction mechanism for a local exhaust device, and more particularly to a multi-directional suction mechanism for a local exhaust device that is applied to prevent radioactive materials from being scattered during periodic inspection of a nuclear power plant.

  In a nuclear power plant, a multi-directional suction mechanism of a local exhaust device is applied in order to prevent scattering of radioactive substances during periodic inspections and the like.

  Conventionally, local exhaust devices having various configurations including commercially available products have been proposed. Generally, two types of exhaust systems for 100V and 200V are known corresponding to the exhaust capacity. . In these local exhaust devices, they are selectively used according to the diameter of the connection duct, the shape of the equipment to be ventilated, and the size of the work place (narrowness).

  In addition, the connection portion between the suction port and the duct of the local exhaust device is temporarily fixed with a curing tape or the like so that the sucked radioactive material is not scattered outside.

Conventionally, as this type of local exhaust device, a structure in which air is blown out through a pipe on the front surface of a curved wall (see Patent Document 1), and a structure in which air that merges with a vortex is blown toward the front surface of an operator ( Patent Document 2), an exhaust hood to which an exhaust pipe is connected, and an intake mechanism that surrounds the outer periphery of the exhaust hood and forms an air curtain in a direction opposite to the exhaust direction, and enables push-pull air supply and exhaust (Patent Document) 3) and the like.
Japanese Patent Publication No. 6-70512 Japanese Laid-Open Patent Publication No. 2000-153363 JP 2006-343022 PR

  As described above, it is necessary to prevent scattering of radioactive materials during periodic inspections of nuclear power plants, and the conventional local exhaust device applied in this case is mainly for 100V corresponding to the exhaust capacity. There are two types for 200V. These local exhaust devices are used differently according to the diameter of the connecting duct, the shape of the equipment to be ventilated, and the size of the work place (narrowness).

  However, there is almost no compatibility with each other regardless of the exhaust capacity. Therefore, the equipment has been expanded mainly at the place where the local exhaust system for 100V is used, which has promoted uneconomical in terms of facilities and cost. .

  Moreover, the connection part of the suction port of a local exhaust apparatus and a duct temporarily fixes the connection part with a suction duct with a curing tape etc. so that the radioactive material attracted | sucks may not be scattered outside. For this reason, when an impact is applied to the device and the connection direction of the connection location varies, the local exhaust device and the duct come off, and there is a concern about contamination expansion due to scattering of radioactive substances.

  The present invention has been made in view of such circumstances, and relates to a local exhaust device for 100V and 200V, and it is not necessary to change the function and exhaust capability of each, and the distribution of connection ducts according to needs is distributed. Can spread the suction direction in many directions and increase the suction force, which can contribute to the prevention of radioactive material scattering, especially the locality that can surely prevent the radioactive material scattering by changing the connection location An object of the present invention is to provide a multidirectional suction mechanism for an exhaust device.

  In order to achieve the above object, in the present invention, a chamber device is mounted and fixed on an upper portion of a substantially box-shaped local exhaust device, and both these devices are communicated with each other through a communication hole. A suction mechanism of a local exhaust device that sucks air through a suction port to the chamber device side and exhausts it from an exhaust duct, and the exhaust duct is provided on all surfaces other than the surface in contact with the local exhaust device of the chamber device. Provided is a multi-directional suction mechanism for a local exhaust device, which is provided with a duct suction port for connection.

  According to the present invention, with regard to the local exhaust system for 100V and 200V, it is possible to provide connection duct dispersion and suction force according to needs without changing the functions of each, and to change the connection location. It is possible to effectively prevent radioactive materials from being scattered.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

[First Embodiment (FIG. 1)]
FIG. 1 is a cross-sectional view of a main part showing a multidirectional suction mechanism of a local exhaust device according to a first embodiment of the present invention.

  As shown in FIG. 1, in this embodiment, a chamber device 3 is mounted on an upper portion of a substantially box-shaped local exhaust device 1 in an arrangement in which the vertical center positions are substantially matched. The plane area of the chamber device 3 is smaller than that of the local exhaust device 1, and thus a stepped portion 6 is formed at the junction between the lower peripheral wall of the chamber device 3 and the lower peripheral wall of the local exhaust device 1. The outer surface side of the stepped portion 6 is connected by an L-shaped bracket 5 including an upper vertical piece 5a, a horizontal piece 5b, and a lower vertical piece 5c, whereby the local exhaust device 1 and the chamber device 3 are integrally connected.

  A suction port 2, which is a communication hole having a predetermined width, is formed at a central position between the upper wall of the local exhaust device 1 and the lower wall of the chamber device 3, whereby the interior of the local exhaust device 1 and the interior of the chamber device 3 are formed. Are communicated with each other, and air is sucked from the local exhaust device 1 side to the chamber device 3 side.

  In this embodiment, the duct suction port 14 for connecting the exhaust duct is provided on all the surfaces (four side surfaces 3b and top surface 3c) other than the surface (bottom surface 3a) in contact with the local exhaust device 1 of the chamber device 3. Are connected to the duct suction ports 14.

  During operation, the air to be treated flows into the chamber device 3 from the local exhaust device 1 through the suction port 2, and the inflowed air passes through all the duct suction ports 14 and is connected to the connection duct 4 as an exhaust duct. And then exhausted to the outside.

  According to the configuration of the present embodiment, air contaminated with radioactive material from the other surface can be sucked from the air suction port 14 of the connection duct 4. That is, as a multi-directional suction mechanism of the local exhaust device 1, by providing a chamber device in which the duct suction port is attached to all other surfaces except the surface in contact with the suction port 2 of the local exhaust device 1, the maximum of the connected ducts is provided. The suction directions from five locations can be obtained.

  Therefore, with regard to the local exhaust system for 100V and 200V, it is not necessary to change the function and exhaust capacity of each, and the connection ducts are distributed according to needs, the suction direction is distributed in many directions and the suction force is increased. It can be increased, and it can contribute to prevention of scattering of radioactive material. In particular, it is possible to reliably prevent scattering of radioactive material by changing the connection location.

[Second Embodiment (FIG. 2)]
FIG. 2 is a cross-sectional view of a main part showing a multidirectional suction mechanism of a local exhaust device according to a second embodiment of the present invention.

  As shown in FIG. 2, in the multi-directional suction mechanism of the local exhaust device of the present embodiment, the vertical area of both devices 1 and 3 is set by setting the plane area of the chamber device 3 smaller than that of the local exhaust device 1. A stepped portion is formed on the wall surface, and the stepped portion is joined by an L-shaped bracket 5 in contact with the upper corner of the local exhaust device 1, an L-shaped bracket 6 attached to the chamber device 3, and a fixing screw 15. It has become the composition.

  Specifically, it is composed of an L-shaped bracket 5 in contact with a right angle portion of the local exhaust device 1, a fixing screw 15 and an L-shaped bracket 6 attached to the chamber device 3. The fixing bracket is fixed in four directions.

  As described above, the L-shaped metal fitting 5 in contact with the right angle portion of the local exhaust device 1 is fastened to the L-shaped metal fitting 6 attached to the chamber device 3 with the fixing screw 15, so that the chamber device 3 is attached to the local exhaust device 1. It can be fixed and the reaction caused by the suction force can be suppressed, and a stable suction direction can be obtained.

  According to the present embodiment, the chamber device can be stably fixed to the local exhaust device regardless of the reaction of the suction force.

[Third Embodiment (FIG. 3)]
FIG. 3 is a cross-sectional view of a main part showing a multidirectional suction mechanism of a local exhaust device according to a third embodiment of the present invention.

  As shown in FIG. 3, in the present embodiment, in the multi-directional suction mechanism of the local exhaust device 1, a plate having a structure in which a punch hole 16 is formed on the surface of the local exhaust device 1 of the chamber device 3 that contacts the suction port 2, A rubber packing 8 is provided between the local exhaust device 1 and the chamber device 3.

  That is, the surface of the chamber device 3 that is in contact with the suction port 2 of the local exhaust device 1 is a plate 7 having a structure in which a punch hole 16 is formed, and is composed of a rubber packing 8 provided between the local exhaust device 1 and the chamber device 3. The

  In this way, by installing the plate 7 having a structure with the punch holes 16 on the lower surface of the chamber device 3, the surface of the local exhaust device 1 and the punch holes 16 are formed with the suction of the local exhaust device 1. The air accumulated in the gap with the plate 7 can be discharged from the punch hole, and the adhesion between the local exhaust device 1 and the chamber device 3 can be increased by the rubber packing 8.

  That is, a plate having a structure in which a punch hole 16 is formed on the surface of the chamber device 3 in contact with the local exhaust device side suction port 2, and punch holes 16 and 17 are formed between the local exhaust device 1 and the chamber device 3. By providing the rubber packing 8, the air on the joining surface is discharged from the punch holes 16 and 17 of the plate by the suction force of the local exhaust device, so that the adhesion can be further obtained.

[Fourth Embodiment (FIG. 4)]
FIG. 4A is a cross-sectional view of a main part showing a multidirectional suction mechanism of a local exhaust device according to a first configuration example of the local exhaust device according to the fourth embodiment of the present invention, and FIG. It is principal part sectional drawing which shows the multidirectional suction mechanism of the local exhaust apparatus by the 2nd structural example of the local exhaust apparatus by 4th Embodiment of this.

  As shown in FIG. 4A, in the first configuration example of the present embodiment, an outwardly facing cylinder 20 is provided in the duct suction port 14 of the chamber device 3, and the air volume adjusting damper 10 and the inside of the cylinder 20 are provided. And a pair of parallel dustproof mesh plates 11 disposed on the outside in the axial direction. The dust-proof mesh plate 11 is connected to the end of the connection duct 4, and the end of the connection duct 4 is inserted into the cylindrical body 20 and fixed by the ring-shaped rubber packing 9. Yes.

  The ring-shaped rubber packing 9 has a flanged cylindrical configuration including a flange portion 9a and a cylinder portion 9b. The flange portion 9a abuts on an end portion of the cylinder body 20, and the cylinder portion 9b is inside the cylinder body 20. It has a structure inserted in.

  According to the present embodiment configured as described above, the air flow adjusting damper 10 and the dustproof mesh plate 11 are provided in the duct suction port 14 of the chamber device 3 so that the air flow adjusting damper 10 can adjust the air flow arbitrarily. In addition, the dust-proof mesh plate 11 can prevent the radioactive material from diffusing.

  Further, as shown in FIG. 4B, in the second configuration example of the present embodiment, the ring-shaped rubber packing 9 is configured to correspond to the diameter of the connection duct 4. In the example of FIG. 4B, the diameter of the connection duct 4 is smaller than that of the example of FIG.

  Thus, by inserting the connection duct 4 into which the ring-shaped rubber packing 9 is inserted up to the mesh plate 11, the staying air is discharged from the mesh plate 11 with the suction force of the local exhaust device 1. The gap with the ring-shaped rubber packing 9 becomes a negative pressure, and the ring-shaped rubber packing 9 is sucked closer to the local exhaust device 1 side, so that the connection duct 4 can be further fixed.

  Further, by changing the diameter of the connection duct 4, it is possible to select the connection duct 4 suitable for the air volume and the size of the work place. When the air volume is excessive, etc., the air volume adjustment is made arbitrarily by the damper 10. Can do.

  Thus, in this embodiment, the duct suction port 14 of the chamber device 3 includes the air volume adjusting damper 10 and the dustproof mesh plate 11. And while adjusting the suction | attraction force supplied with the air volume adjustment damper 10, the spreading | diffusion of a radioactive substance can be prevented with the dustproof mesh board 11. FIG.

[Fifth Embodiment (FIG. 5)]
FIG. 5A is a longitudinal sectional view of a main part showing a multidirectional suction mechanism of a local exhaust device according to a fifth embodiment of the present invention, and FIG. 5B is a plan view.

  This embodiment demonstrates the structure which fixes a connection duct using the ring-shaped rubber packing according to the aperture of the connection duct.

  As shown in FIGS. 5A and 5B, a lower ring-shaped component 12 with a lower end flange 12 a along the vertical axis direction is provided in the communication hole 2 portion of the upper wall portion of the chamber device 3. A screw 17 is engraved on the outer periphery of the rising portion of the lower ring-shaped component 12.

  On the other hand, the chamber apparatus 3 is provided with a nut-shaped upper ring-shaped part 13 in the communication hole 2 portion of the bottom wall portion. The upper ring-shaped component 13 is screwed into a screw 17 inserted into the suction port 2 of the local exhaust device 1 in a coaxial arrangement with the communication hole 2. As a result, the bottom wall of the chamber device 3 and the top wall of the local exhaust device 1 are connected and fixed via the lower ring-shaped component 12 and the upper ring-shaped component 13 formed with screws. .

  At the time of assembly, first, the lower ring-shaped component 12 is fitted into the suction port 2 of the local exhaust device 1, and the chamber device 3 is attached thereon. Next, the upper ring-shaped component 12 is attached from the inside of the chaber device 3, the screw portion with the upper ring-shaped component 13 is aligned and screwed in, and the chamber device 3 is fixed.

  According to the present embodiment, the chamber apparatus 3 is attached between the lower ring-shaped component 12 and the upper ring-shaped component 13 and the second embodiment is used together, whereby the L-shaped bracket 5 of the second embodiment is Even in the case of a deviation, the local exhaust device 1 and the chamber device 3 can be reliably fixed.

  According to this embodiment, the connection duct 4 can be fixed using a ring-shaped rubber packing corresponding to the diameter of the connection duct, and the ring-shaped rubber packing is sucked to the local exhaust device side by the suction force of the local exhaust device. The duct can be securely fixed to the local exhaust device. Moreover, the installation according to the duct diameter is attained by changing the diameter.

[Other Embodiments]
The present invention is implemented as a method of fixing a chamber apparatus characterized by fixing with a threaded lower ring-shaped part inserted into a suction port of a local exhaust device and a threaded upper ring-shaped part. be able to.

  Further, the local exhaust device positioned between the lower ring-shaped component and the upper ring-shaped component can be more reliably fixed in addition to the fixing of the second aspect.

The principal part sectional view showing a 1st embodiment of the present invention. The principal part sectional view showing a 2nd embodiment of the present invention. The principal part sectional view showing a 3rd embodiment of the present invention. (A) is principal part sectional drawing which shows the 1st structural example of 4th Embodiment of this invention, (b) is principal part sectional drawing by a 2nd structural example. (A) is a principal part longitudinal cross-sectional view which shows 5th Embodiment of this invention, (b) is a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Local exhaust apparatus 2 Local exhaust apparatus suction port 3 Chamber apparatus 4 Connection duct 5 L-shaped metal fitting (local exhaust apparatus side)
6 Stepped portion 7 Punch hole structure plate 8 Rubber packing 9 Ring-shaped rubber packing 9a Gutter portion 9b Tube portion 10 Air flow adjustment damper 11 Dust-proof mesh plate 12 Lower ring-shaped component 13 Upper ring-shaped component 14 Duct suction port 15 Fixing screw 16 Punch Hole 17 Screw 20 Tube

Claims (4)

A chamber device is mounted and fixed on the upper part of a substantially box-shaped local exhaust device, and these devices are communicated with each other through a communication hole so that air is supplied from the local exhaust device side to the chamber device side through a suction port. A suction mechanism for a local exhaust device that sucks and exhausts air from an exhaust duct, wherein a duct suction port for connecting an exhaust duct is provided on all surfaces other than the surface in contact with the local exhaust device of the chamber device. Multi-directional suction mechanism for local exhaust system. 2. The multidirectional suction mechanism for a local exhaust device according to claim 1, wherein step portions are provided on outer surfaces of the chamber device and the local exhaust device, and an upper corner portion of the local exhaust device and the chamber at these step portions. A multi-directional suction mechanism for a local exhaust device in which the device is joined by an L-shaped bracket and a fixing screw. 2. The multidirectional suction mechanism for a local exhaust device according to claim 1, wherein a punch hole is formed in a surface of the local exhaust device in contact with the suction port, and a rubber packing is provided between the local exhaust device and the chamber device. A multi-directional suction mechanism for a local exhaust device provided with The multidirectional suction mechanism for a local exhaust apparatus according to claim 1, wherein the duct suction port of the chamber apparatus includes an air volume adjusting damper and a dustproof mesh plate.

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