Ventilation duct system for range hoods

Abstract

To enable a fire damper of a range hood ventilation duct to be disposed indoors even when the range hood is close to the outside, thereby facilitating the maintenance, recovery and repair work of the fire damper.SOLUTION: A range hood 1 in a building's kitchen is connected to an outside area 4 through a ventilation duct 11 of a ventilation duct device 10. The ventilation duct 11 includes a vertical duct part 12 and a horizontal duct part 13 and is formed in an L-shape. The vertical duct part 12 has its lower end connected to the range hood 1. The horizontal duct part 13 is connected to the upper end of the vertical duct part 12 and faces the outside area 4 through an exterior wall 2 of the building. The fire damper 20 has a shutter 21 to be accommodated in the vertical duct part 12 and a checkup box 23 is provided on the outer face of the vertical duct part 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a ventilation duct device that connects a range hood provided in a kitchen of a building such as a house to the outside, and particularly to a ventilation duct device suitable for a kitchen in a corner room where the distance from the range hood to the outside is short.

Background Art

[0002] Generally, a range hood is provided in the kitchen of buildings such as apartment houses and detached houses, and a ventilation duct extends from the range hood to the outside (see Patent Document 1, etc.). It is stipulated by law to provide a fire damper in this type of ventilation duct for range hoods. When the temperature rises above a certain level due to a fire, the temperature fuse of the fire damper blows and the shutter is closed (see Patent Document 2, etc.). This can prevent the flame of a fire outside from entering the room through the ventilation duct, or the flame of a fire inside from leaking outside through the ventilation duct and spreading.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Normally, most of the ventilation duct for the range hood is horizontally piped along the ceiling. A fire damper is provided in the horizontal duct section. On the other hand, in some cases, such as in corner units of apartment buildings, the distance from the range hood to the outside may be only about the thickness of the exterior wall, and there may not be enough length to install a fire damper in the horizontal duct. In such cases, the fire damper is installed inside the vent cap connected to the opening of the ventilation duct to the exterior wall. However, this means that maintenance, inspection, and repair work in the event of malfunctions or other issues with the fire damper must be done outdoors. In high-rise apartments, this requires setting up scaffolding outdoors, which is extremely cumbersome. In view of these circumstances, the present invention aims to facilitate maintenance, inspection, restoration, and repair work on fire dampers by enabling the placement of fire dampers for range hood ventilation ducts indoors, even when the distance from the range hood to the outdoors is short. [Means for solving the problem]

[0005] To solve the aforementioned problems, the present invention provides a ventilation duct system connecting a range hood in a building's kitchen to the outdoors, An L-shaped ventilation duct including a vertical duct section and a horizontal duct section, The ventilation duct includes a normally open shutter that closes when the temperature exceeds a certain level, and a fire damper including an inspection box. The lower end of the vertical duct section is connected to the range hood, and the horizontal duct section is connected to the upper end of the vertical duct section and faces the outdoors through the building's exterior wall. The shutter is housed in the vertical duct section, and the inspection box is provided on the outer surface of the vertical duct section.

[0006] Preferably, the shutter includes a rotating shaft that intersects with the pipe axis of the vertical duct section, and rotating blades that are rotatably mounted around the rotating shaft, with the rotating blades in the open state protruding above the bottom of the inner circumferential surface of the horizontal duct section.

[0007] It is preferable that the horizontal duct section is routed along the underside of the ceiling panel above the range hood.

[0008] Preferably, the ventilation duct is covered with an insulating cover, the insulating cover includes a pair of L-shaped half-insulated cover members extending over the vertical duct portion and the horizontal duct portion, and the pair of half-insulated cover members cover the outer surface of the ventilation duct from both sides. [Effects of the Invention]

[0009] According to the present invention, even if the distance from the range hood to the outdoors is short, the fire damper for the range hood ventilation duct can be placed indoors. Therefore, maintenance, inspection, and repair work on the fire damper can be easily performed. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side cross-sectional view taken along line II in Figure 2, showing a ventilation duct device for a range hood according to one embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view taken along the line II-II in Figure 1. [Figure 3] Figure 3 is an exploded perspective view of the ventilation duct device for the range hood. [Modes for carrying out the invention]

[0011] One embodiment of the present invention will be described below with reference to the drawings. Figures 1 and 2 show, for example, the area around the range hood in a kitchen of a corner apartment in a multi-unit building. A ventilation duct system 10 is connected to the range hood 1. The ventilation duct system 10 connects the range hood 1 to the outdoors 4.

[0012] As shown in Figures 2 and 3, the ventilation duct system 10 comprises a ventilation duct 11, a fire damper 20, and an insulating cover 30. The ventilation duct 11 includes a vertical duct section 12 and a horizontal duct section 13, and is bent in an L-shape. As shown in Figure 1, the vertical duct section 12 is piped vertically between the ceiling panel 3 and the range hood 1. The lower end of the vertical duct section 12 is connected to the upper end of the range hood 1.

[0013] As shown in Figure 1, the horizontal duct section 13 is connected to the upper end of the vertical duct section 12 and is piped horizontally along the underside of the ceiling panel 3 above the range hood 1. In corner units, the length of the horizontal duct section 13 is short because the distance from the range hood 1 to the outdoors 4 is short. The opening at the end of the horizontal duct section 13 faces the outdoors 4 through the building's exterior wall 2 and the outlet cap 5.

[0014] As shown in Figure 1, a fire damper 20 is provided in the vertical duct section 12. The fire damper 20 includes a normally open shutter 21, a thermal fuse 22, and an inspection box 23. The shutter 21 and the thermal fuse 22 are housed inside the vertical duct section 12. The shutter 21 includes a rotating blade 24 and a rotating shaft 25. The rotating blade 24 is formed, for example, in a disc shape. The outer diameter of the rotating blade 24 is substantially equal to the inner diameter of the vertical duct section 12. The rotating shaft 25 is provided along one diameter of the rotating blade 24. The rotating shaft 25 is oriented horizontally so as to intersect with the pipe axis L12 of the vertical duct section 12. The rotating blade 24 is rotatably supported around the rotating shaft 25. The shutter 21 is rotationally biased in the closing direction by the spring force of a torsion coil spring 26.

[0015] As shown in Figure 1, a fuse support rod 27 is provided on the side of the shutter 21 within the vertical duct section 12. A thermal fuse 22 is supported by the fuse support rod 27. The shutter 21 and the thermal fuse 22 are connected, so that the shutter 21 is held open against the spring force. As shown in Figure 2, the rotating blades 24 in the open state are vertical, and their upper end 24a protrudes above the bottom 13b of the inner circumferential surface of the horizontal duct section 13.

[0016] When the temperature inside the ventilation duct 11 reaches a certain temperature or higher due to a fire or the like, the temperature fuse 22 blows. Then, the shutter 21 is closed by the rotational biasing force of the torsion coil spring 26. As shown by the two-dot chain line in Fig. 2. The closed shutter 21 is horizontal and closes the vertical duct portion 12. That is, the shutter 21 closes the ventilation duct 11 at a certain temperature or higher.

[0017] As shown in Fig. 1, an inspection box 23 is provided on the outer surface of the vertical duct portion 12. Therefore, the inspection box 23 is arranged between the ceiling board 3 and the range hood 1. Preferably, the inspection box 23 is arranged on the side portion of the outer periphery of the vertical duct portion 12 opposite to the horizontal duct portion 13 side. The inspection box 23 is formed in the shape of a rectangular parallelepiped box, and its longitudinal direction is directed vertically along the vertical duct portion 12.

[0018] As shown in Fig. 3, a manual reset lever 28 and an opening / closing door 29 are provided on the front panel 23a of the inspection box 23. As shown in Fig. 1, the end of the rotating shaft 25 is connected to the manual reset lever 28. The manual reset lever 28 protrudes from the front panel 23a to the outside of the inspection box 23 (the right side in Fig. 1).

[0019] As shown in Fig. 1, the outer surface of the ventilation duct 11 is covered by a heat insulation cover 30. As shown in Fig. 3, the heat insulation cover 30 includes a pair of semi-heat insulation cover members 31. The pair of semi-heat insulation cover members 31 cover the outer peripheral surface of the ventilation duct 11 from both sides. Each semi-heat insulation cover member 31 is formed in an L shape extending over the vertical duct portion 12 and the horizontal duct portion 13.

[0020] Specifically, as shown in FIG. 3, each semi-segmented heat insulation cover member 31 includes a vertical cover portion 32 covering a semi-perimeter of the vertical duct portion 12 and a horizontal cover portion 33 covering a semi-perimeter of the horizontal duct portion 13. A box cover portion 34 is provided on the vertical cover portion 32. The box cover portion 34 of each semi-segmented heat insulation cover member 31 covers approximately half of the inspection box 23. Preferably, as shown in FIGS. 1 and 3, the box cover portion 34 is also interposed between the manual return lever 28 and the front panel 23a and covers the shaft portion of the manual return lever 28.

[0021] A door cover portion 35 covering the opening / closing door 29 is provided on the box cover portion 34. The door cover portion 35 is detachable from the box cover portion 34. By removing the door cover portion 35 from the box cover portion 34, the opening / closing door 29 can be opened and closed.

[0022] According to the ventilation duct device 10 for a range hood, the exhaust gas from the range hood 1 can be discharged to the outdoors 4 through the ventilation duct 11. Even if the exhaust gas is at a high temperature, by insulating with the heat insulation cover 30, it is possible to prevent the heat of the exhaust gas from being transmitted to the building structures around the ventilation duct 11 and the interior. In the event of a fire, as described above, the temperature fuse 22 blows and the shutter 21 is closed. Thereby, it is possible to avoid the indoor flame leaking outdoors through the ventilation duct 11 or the outdoor flame entering the indoor through the ventilation duct 11.

[0023] Even though the distance from the range hood 1 to the outside 4 is short because it is a corner unit in an apartment building, by installing the fire damper 20 in the vertical duct section 12, maintenance, inspection, restoration, and repair of the fire damper 20 can be performed indoors. Specifically, inside the corner unit, by removing the door cover section 35 directly above the range hood 1 and opening the opening / closing door 29, it is possible to look inside the inspection box 23 and the ventilation duct 11. This allows, for example, if the shutter 21 closes or the thermal fuse 22 blows due to a malfunction, the manual reset lever 28 can be turned to return the shutter 21 to the open position, or the thermal fuse 22 can be replaced. Since these tasks can be performed indoors and do not require scaffolding to be erected outdoors, the time required for maintenance, inspection, restoration, and repair can be significantly reduced, and costs can be significantly lowered.

[0024] The present invention is not limited to the embodiments described above, and various modifications can be made without departing from its spirit. For example, the shutter 21 of the fire damper 20 is not limited to a single-blade structure, but may also have a two-blade structure. The horizontal duct section 13 may be routed in the ceiling space (on the upper side of the ceiling panel 3). [Industrial applicability]

[0025] This invention can be applied, for example, to a range hood ventilation system in a corner unit of an apartment building. [Explanation of Symbols]

[0026] 1. Range hood in the building's kitchen 2. Exterior walls 3 Ceiling panels 4 Outdoor 10. Ventilation duct system for range hoods 11 Ventilation duct 12 Vertical duct section L12 tube shaft 13 Horizontal duct section 13b bottom 20 Fire dampers 21. Normally open shutter 22 Thermal fuse 23 Inspection Box 23a Front plate 24 rotating blades 24a Upper end 25 Rotation axis 26 Torsion coil spring 27 Fuse support rod 28 Manual return lever 29 Opening and closing doors 30 Insulation Cover 31 Half-split insulation cover component 32 Vertical cover section 33 Horizontal cover section 34 Box cover section 35 Door cover section

Claims

1. A ventilation duct system connecting the range hood of a building's kitchen to the outdoors, An L-shaped ventilation duct including a vertical duct section and a horizontal duct section, The ventilation duct includes a normally open shutter that closes when the temperature exceeds a certain level, and a fire damper including an inspection box. The lower end of the vertical duct section is connected to the range hood, and the horizontal duct section is connected to the upper end of the vertical duct section and faces the outdoors through the building's exterior wall. The shutter is housed in the vertical duct section, and the inspection box is provided on the outer surface of the vertical duct section. A ventilation duct device for a range hood, characterized in that the shutter includes a rotating shaft that intersects with the pipe axis of the vertical duct section, and a rotating vane rotatably mounted around the rotating shaft, wherein the rotating vane in the open state protrudes upward from the bottom of the inner circumferential surface of the horizontal duct section.

2. The ventilation duct device for a range hood according to claim 1, characterized in that the horizontal duct section is routed along the underside of the ceiling panel above the range hood.

3. The ventilation duct device for a range hood according to claim 1, further comprising an insulating cover that covers the ventilation duct, wherein the insulating cover includes a pair of L-shaped half-insulated cover members extending over the vertical duct portion and the horizontal duct portion, and the pair of half-insulated cover members cover the outer circumferential surface of the ventilation duct from both sides.

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