JP2005134032A - Local ventilation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a local ventilation device preventing accumulation of dust in a bottom of a duct, and preventing backlash of a corner duct even when weight and moment are applied to a hanging bolt. <P>SOLUTION: In the local ventilation device, a three-dimensionally movable round duct assembly provided with a joint 7, round ducts 8 and 6 provided with hoods in lower ends, or the like is connected to a lower end of the corner duct 9 with a lower part extending downward than a ceiling board 10 and an upper end extending above the ceiling board 10. The round duct 8 of an uppermost part of the round duct assembly is turnably inserted in the corner duct 9, an insertion round duct 23 is housed in the corner duct 9 such that it is communicated with a round duct 8 interior of the uppermost part, and the corner duct 9 is supported by the hanging bolt 18 and a stabilizer bolt 27. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a local exhaust device.

  Various production facilities in the factory have a device that generates exhaust gas containing dust, odors, harmful substances, etc., and in order to prevent the exhaust generated by such device from diffusing into the plant, the exhaust generated by the device A local exhaust duct system for exhausting the air locally is installed corresponding to each device.

  As this local exhaust duct system, when the device that generates exhaust is movable, or when the upper surface of a part of the device is open, or the device does not like the internal air pressure fluctuation, the exhaust of the device Some hoods are installed in the vicinity of the location, and exhaust is indirectly sucked through the hood.

  An example of a local exhaust device that performs indirect exhaust is shown in FIGS. In the figure, 1 is a round funnel-shaped hood that is disposed in the vicinity of a device that generates exhaust in the factory so that the exhaust can be sucked, 2 is a round duct having one end connected to the top of the hood, 3 is a joint whose one end is connected to the other end of the round duct 2, 4 is a round duct whose one end is connected to the other end of the joint 3, and 5 is one end connected to the other end of the round duct 4 6 is a round duct having one end connected to the other end of the joint 5, 7 is a joint having one end connected to the other end of the round duct 6, and 8 is the other end of the joint 7. A round duct under the ceiling connected to the section, 9 is a square duct connected to the upper end of the round duct 8. Each of the joints 3, 5, and 7 can move in two dimensions like a joint of a hand.

  Thus, a round duct assembly is formed by the hood 1, the round duct 2, the joint 3, the round duct 4, the joint 5, the round duct 6, the joint 7, and the round duct 8.

  As shown in FIG. 4, a receiving member 11 having a rectangular outer periphery and a circular opening in the center is detachably fitted in the lower end inside the rectangular duct 9 located below the ceiling plate 10. 12 is fixed to the square duct 9. Further, the upper end portion of the round duct 8 is fitted into an O-ring 13 fitted in the hole 11a of the receiving member 11 so as to be rotatable over a range of 360 degrees. Therefore, the round duct assembly can move in three dimensions.

  A flexible duct 15 is connected to a connection port 14 attached to a side portion located in the ceiling of the rectangular duct 9, and the flexible duct 15 is connected to an exhaust fan (not shown).

  A blind flange 17 is disposed on the square duct flange 16 at the upper end of the square duct 9, and the lower ends of the suspension bolts 18 of all screws whose upper ends are fixed to a suspension base (not shown) are fastened to the square duct flange 16 and the blind flange 17. Has been.

  A caulking 19 is applied to the corner plate 9 penetrating portion of the ceiling plate 10, and a decorative plate 20 externally fitted to the corner duct 9 is attached to the lower surface of the ceiling plate 10 by a screw member 21. Is hidden from the room.

  In the local exhaust device, when an exhaust fan (not shown) is driven, the exhaust gas discharged from the device is sucked into the hood 1 and the round duct 2, the joint 3, the round duct 4, the joint 5, and the round duct. 6, the joint 7 and the round duct 8 are sequentially introduced into the rectangular duct 9, and are discharged from the rectangular duct 9 through the flexible duct 15 by the exhaust fan.

  When switching from local exhaust of one device to local exhaust of another device, the hood 1 may be moved to the vicinity of the target device. At this time, since the joints 3, 5, and 7 are provided and the round duct 8 is rotated in the horizontal direction with respect to the receiving member 11, the movement of the hood 1 to the target device is smoothly performed without any trouble.

  Examples of exhaust devices other than the local exhaust device include Patent Document 1, Patent Document 2, and Patent Document 3.

  Patent Document 1 is a ventilation device in which a ventilation port is formed on a ceiling surface of a bathroom or the like, and a main body is connected to an exhaust duct disposed outside the room, and a joint portion of the exhaust duct is provided. The provided main body and the bottom plate attached to the ceiling side are integrally formed, and the bottom plate is fixed to a reinforcing member attached to the upper surface of the ceiling.

  Patent Document 2 is a pipe that is inserted into an air exhaust hole provided in a wall or a ceiling and is attached to the pipe body. The pipe body is inserted into the air exhaust hole and provided with a flange at one end, and the outer periphery of the pipe body near the flange. Is attached to the flange at a predetermined position on the flange so that it can be screwed or inserted, and the tip is attached so that it can be screwed. By screwing, the tip of the press member is pulled toward the flange and discharged. A pressing member pulling member for holding a wall surface member near the outer periphery of the air hole between the flange and fixing the pipe body;

In Patent Document 3, a sliding lifting cylinder having a smoke collection hood attached to the lower end is fitted to a fixed hanging cylinder communicating with an exhaust duct provided on the back of an indoor wall.
JP-A-6-257810 JP 2000-46387 A JP-A-9-112986

  However, in the local exhaust apparatus shown in FIGS. 3 and 4, dust 22 (see FIG. 4) contained in the exhaust accumulates at the bottom of the corner duct 9, and the corner exhaust 9 stops when the exhaust fan for local exhaust is stopped. The dust 22 accumulated at the bottom of the duct 9 (the upper surface of the receiving member 11) may flow backward in the direction of arrow A in FIG.

  The suspension bolt 18 supports the weight of the square duct 9, the round ducts 8, 6, 4, 2 and the joints 7, 5, 3, and the hood 1 through the square duct flange 16 and the blind flange 17. The moment force generated when the ducts 8, 6, 4, 2 slide relative to the joints 7, 5, 3 or the round duct 8 rotates with respect to the rectangular duct 9 is also the rectangular duct 9, rectangular duct flange 16, blind It is supported by the suspension bolt 18 via the flange 17. Therefore, in order to support the weight and moment force by the suspension bolt 18 via the square duct 9, the square duct flange 16, and the blind flange 17, the structural rigidity is low and there is a possibility that the square duct 9 may be rattled. is there.

  In Patent Document 1, a main body provided with a joint portion of a ventilation duct and a bottom plate attached to the ceiling side are integrally formed, and the bottom plate is attached to the upper surface of the ceiling via a flat reinforcing member. Since no brace-like member is provided, there is a risk of rattling of the main body due to long-term use.

  In Patent Document 2, a pipe body is inserted into a wind exhaust hole formed in a wall or a ceiling, and the pipe body is supported by the ceiling. However, the pressing member that holds the ceiling plate together with the flange is small, and the score is about two points. In addition, since the brace-like member is not provided in the pipe body, there is a possibility that the pipe body will be rattled due to long-term use.

  In Patent Document 3, the fixed suspended cylinder communicating with the exhaust duct provided behind the indoor wall is supported on the ceiling together with the exhaust duct, but the fixed suspended cylinder and the exhaust duct are supported only on the ceiling. Since the member is not provided, there is a possibility that the pipe main body may be rattled due to vibration or the like accompanying the raising / lowering of the sliding raising / lowering cylinder.

  In view of the above circumstances, the present invention provides a local exhaust device in which dust does not accumulate at the bottom of a square duct and the square duct does not rattle even if weight and moment force act on the suspension bolt. It was made for the purpose of doing.

  The local exhaust system according to claim 1 is a circle having a hood at the lower end and a three-dimensional movable circle at the lower end of a rectangular duct whose lower portion extends below the ceiling plate and whose upper portion extends above the ceiling plate. A local exhaust system to which a round duct assembly composed of a duct and a joint is connected, wherein the round duct at the top of the round duct assembly is rotatably inserted into the square duct from the bottom surface of the square duct, In the duct, another round duct is arranged so as to communicate with the uppermost round duct.

  According to another aspect of the present invention, the round duct disposed in the square duct extends upward from the upper end of the round duct at the top of the round duct assembly.

  According to a third aspect of the present invention, the inner diameter of the round duct disposed in the rectangular duct is configured to be substantially the same as or slightly different from the inner diameter of the uppermost round duct of the round duct assembly. It is what.

  According to a fourth aspect of the present invention, the uppermost round duct of the round duct assembly is rotatably fitted to a receiving member that is detachably fitted to the lower end of the square duct, and is disposed in the square duct. The round duct is supported by the receiving member.

  In the local exhaust system of claim 5, the round duct arranged in the square duct is fastened to the suspension member that suspends the flange provided in the upper part of the square duct via the flange provided in the round duct. It is.

  In the local exhaust system of claim 6, the rectangular duct is integrally provided on the upper surface of the rectangular duct, and is supported by the upper surface of the flange, and the round duct passes therethrough. A flange with an opening formed so that the outer periphery of the round duct abuts, and a flange attached to the round duct by fastening with a suspension member, so that each suspension member in the longitudinal section is supported at two points on the top and bottom, for a total of four points. It is configured to

  In the local exhaust device of claim 7, the square duct is supported via a rocking member in addition to the suspension member, and in the local exhaust device of claim 8, the portion below the ceiling plate of the square duct is It is fixed by a fixing member protruding from the wall.

  According to the local exhaust apparatus of claims 1 to 8 of the present invention, the dust contained in the exhaust does not collect at the bottom of the square duct, and the dust is removed when the exhaust fan for local exhaust is stopped. However, it does not flow backward and does not fall downward, and the square duct is firmly and securely supported, so that the square duct is not rattled by use, and the receiving member is removable. Therefore, the inside of the square duct and the insertion round duct can be easily cleaned, and furthermore, since the rocking bolt is not attached to the part below the ceiling plate of the square duct, the appearance is also good. Various excellent effects can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are examples of embodiments for carrying out the present invention, and in the figure, parts denoted by the same reference numerals as those in FIGS. 3 and 4 represent the same items. Thus, in the illustrated example, the height above the ceiling plate 10 of the rectangular duct 9 is formed shorter than in the case of FIGS. 3 and 4, and the side surface of the rectangular duct 9 illustrated in FIG. 4 is connected. The mouth 14 is removed, an opening 17a is provided in the center of the blind flange 17 at the upper end of the square duct 9 to form a companion flange 17 ', and the inner diameter is formed on the upper surface of the receiving member 11 at the lower end in the rectangular duct 9. An edge portion 11b that is formed to have the same diameter as the inner diameter of the hole 11a and protrudes upward is integrally provided. Is externally fitted. The inner diameter of the insertion round duct 23 may be substantially the same as the inner diameter of the round duct 8. That is, the insertion round duct 23 may be fitted into the edge portion 11b.

  The insertion round duct 23 is inserted through the opening 17a of the opposite flange 17 'and protrudes upward from the rectangular duct 9. The round duct flange 24a is fixed to the upper end of the insertion round duct 23 in the middle in the axial direction. The provided short pipe 24 is fixed. The inner diameter of the opening 17a of the opposite flange 17 'is slightly larger than the outer diameter of the insertion round duct 23, and the outer periphery of the insertion round duct 23 is in contact with the inner peripheral edge of the opening 17a. The short pipe 24 is connected with a flexible duct 25 connected to an exhaust fan.

  On the rectangular duct flange 16 of the rectangular duct 9, a lower end of a suspension bolt 18 of all screws extending upward is fixed via a companion flange 17 '. A midway portion of the suspension bolt 18 extends upward through the round duct flange 24a, and its upper end is fixed to a suspension base (not shown). Thus, the round duct flange 24 a is fixed to the suspension bolt 18.

  A bracket 26 is attached to the square duct flange 16 of the square duct 9, and a rocking bolt 27 of all screws functioning as a brace is fixed to the bracket 26. The rocking bolt 27 extends obliquely upward, and its upper end is fixed to the suspension base.

Next, the operation of the illustrated example will be described.
In the local exhaust apparatus of this illustrated example, when an exhaust fan (not shown) is driven, the exhaust discharged from the apparatus is sucked into the hood 1, and the round duct 2, the joint 3, the round duct 4, and the joint 5. The circular duct 6, the joint 7, and the circular duct 8 are sequentially introduced into the insertion round duct 23 in the rectangular duct 9. The insertion round duct 23 passes through the flexible duct 25 and is exhausted by the exhaust fan.

  When switching from local exhaust of one device to local exhaust of another device, the hood 1 may be moved to the vicinity of the target device. At this time, since the joints 3, 5, and 7 are provided and the round duct 8 can be rotated in the horizontal direction with respect to the receiving member 11, the movement of the hood 1 to the target device is smoothly performed without any trouble.

  In this case, in the local exhaust system shown in FIGS. 1 and 2, the round duct 8 accommodates the insertion round duct 23 formed in the square duct 9 having a slightly larger diameter than the inner diameter of the round duct 8. Exhaust air passes through the insertion round duct 23. For this reason, the dust contained in the exhaust does not collect at the bottom of the square duct 9, and when the exhaust fan for local exhaust is stopped, the dust does not flow backward and fall downward.

  The suspension bolts 18 support the weights of the round ducts 8, 6, 4, and the joints 7, 5, 3 and the hood 1 through the opposite flange 17 a ′, the square duct flange 16, the duct 9, and the receiving member 11. In addition, the weight of the insertion round duct 23 and the short pipe 24 with the round duct flange 24a is supported through the round duct flange 24a and the opposite flange 17a ′, the square duct flange 16, the square duct 9, and the receiving member 11. The moment force generated when the round ducts 8, 6, 4, 2 slide with respect to the joints 7, 5, 3 or the round duct 8 rotates with respect to the square duct 9 is generated by the receiving member 11, the square duct. 9, via the square duct flange 16 and the opposite flange 17 ', the receiving member 11, the insertion round duct 23, the inner peripheral edge of the opening 17a of the opposite flange 17', the opposite flange 17 ', and further the receiving member 11 The suspension bolts 18 are supported by the suspension bolts 27 connected to the brackets 26 through the insertion round duct 23, the short pipe 24, and the round duct flange 24a.

  For this reason, in the illustrated example, the square duct 9 is improved in rigidity and is supported firmly and reliably, so that the square duct 9 is not rattled by use. Moreover, since the rocking bolt is not attached to the part below the ceiling board 10 of the square duct 9, the appearance is also good.

  In the local exhaust system of the present invention, the case where the rocking bolt 27 is connected to the square duct flange 16 of the square duct 9 via the bracket 26 in the upper part of the ceiling plate 10 has been described. When the portion below the plate 10 is long, for example, the corner duct 9 can be fixed by a rocking member projecting from the side wall, and various other modifications can be made without departing from the scope of the present invention. Of course, changes can be made.

It is a perspective view of an example of an embodiment of a local exhaust apparatus of the present invention. It is a longitudinal cross-sectional view of FIG. It is a perspective view which shows an example of the external shape of the part under the ceiling in a local exhaust apparatus. It is a longitudinal cross-sectional view of the conventional local exhaust apparatus.

Explanation of symbols

1 Hood 2 Round duct (Round duct assembly)
3 Fitting (Round duct assembly)
4 Round duct (Round duct assembly)
5 Fitting (Round duct assembly)
6 Round duct (Round duct assembly)
7 Fitting (Round duct assembly)
8 Round duct (Round duct assembly)
9 square duct 10 ceiling plate 11 receiving member 16 square duct flange (flange)
17 'companion flange (flange)
17a opening 18 suspension bolt (suspending member)
23 Insertion round duct (round duct)
24a Round duct flange (flange)
27 Rocking bolt (rocking member)

Claims (8)

  A round duct assembly comprising a round duct and a joint which is provided with a hood at the lower end and is movable in three dimensions at the lower end of a rectangular duct whose lower portion extends below the ceiling plate and whose upper portion extends above the ceiling plate. A connected local exhaust system, wherein the uppermost round duct of the round duct assembly is rotatably inserted into the square duct from the lower surface of the square duct, and the uppermost round duct is inserted into the square duct; A local exhaust device, wherein another round duct is disposed so as to communicate with the inside of the round duct.   The local exhaust system according to claim 1, wherein the round duct disposed in the rectangular duct extends upward from an upper end portion of the uppermost round duct of the round duct assembly.   3. The local duct according to claim 1, wherein an inner diameter of the round duct arranged in the square duct is configured to be substantially the same as or slightly different from the inner diameter of the uppermost round duct of the round duct assembly. Exhaust system.   The uppermost round duct of the round duct assembly is rotatably fitted to a receiving member that is detachably fitted to the lower end of the rectangular duct, and the round duct disposed in the rectangular duct is supported by the receiving member. The local exhaust system according to claim 1, 2, or 3.   The round duct arranged in the square duct is fastened to a suspension member that suspends a flange provided in the upper part of the square duct via a flange provided in the round duct. Local exhaust ventilation.   The rectangular duct has a flange integrally provided on the upper surface of the rectangular duct, and an opening portion that is supported by the upper surface of the flange and through which the circular duct penetrates, and that the outer periphery of the circular duct contacts the inner peripheral edge. 1 and 2, wherein the flange attached to the round duct and the flange attached to the round duct are fastened by a suspension member, so that each suspension member is supported at two points in the vertical cross section at a total of four points. The local exhaust apparatus according to 3, 4, or 5.   The local exhaust device according to claim 1, 2, 3, 4, 5, or 6, wherein the square duct is supported via a rocking member in addition to the suspension member.   The local exhaust apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, wherein a portion below the ceiling plate of the square duct is fixed by a fixing member protruding from the wall.

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