JP3015257U - Air conditioning / ventilation duct - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an air-conditioning / ventilation duct that can reduce the air resistance of a water blocking member and stabilize the installation. In an air-conditioning / ventilation duct in which a water blocking member 3 is installed in the vicinity of an outer end portion of a round duct 2 whose outer end portion is open to the atmosphere and which penetrates an outer wall 1 of a building, The end of a cylindrical body having the same outer diameter as the inner diameter of the duct is cut off in a plane that diagonally intersects the axis, and the semicircular end surface 3a faces the outer end. Since the end surface functions as a water stop surface, the direction of the flow of exhaust gas hitting the water stop member is changed to the inclined surface 3c.
Change gradually and increase the area of the surface in contact with the bottom surface inside the duct.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air conditioning / ventilation duct, and more particularly to an air conditioning / ventilation duct in which a water blocking member for preventing infiltration of rainwater is installed near the outer end.

[0002]

[Prior art]

 Conventionally, this type of air-conditioning / ventilation duct has been installed near the outer end of a circular duct 32 whose outer end is open to the atmosphere by horizontally penetrating an outer wall 31 of a building, as shown in FIGS. The water blocking member 33 in the shape of a semicircle is internally mounted in a band-shaped mounting portion 33a provided along the arc thereof. The waterproof member 33 is internally mounted by fixing the mounting portion 33a to the inner bottom surface of the duct with an adhesive or the like. Further, in FIG. 4, reference numeral 34 is an L-shaped exhaust pipe having a blowout slit 35.

[0003]

[Problems to be solved by the device]

 However, in the conventional air-conditioning / ventilation duct, since the water stop member is erected at right angles to the axis of the round duct, it receives exhaust gas (air flow) properly and has a high air resistance. There is a defect. Also, since the area in contact with the inner bottom surface of the duct is small, there is a problem that the water blocking member falls over or comes off due to the resistance of the exhaust gas. Therefore, an object of the present invention is to provide an air conditioning / ventilation duct that can reduce the air resistance of the water blocking member and stabilize the mounting.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the air conditioning / ventilation duct of the present invention is an air conditioning system in which a water blocking member is installed near the outer end of a circular duct that penetrates the outer wall of a building and has its outer end open to the atmosphere. -In the ventilation duct, the water stop member is in the shape of a section obtained by cutting the end of a cylindrical body having the same outer diameter as the duct inner diameter with a plane that diagonally intersects the axis, and the semicircular end face as the outer end. It is characterized in that it is attached to the bottom surface inside the duct via an arc surface. The slope of the inclined surface of the water blocking member is preferably 3/10 to 4/10. Further, the height of the water blocking member is preferably 25/100 to 30/100 of the inner diameter of the duct.

[0005]

[Action]

 In the air conditioning / ventilation duct of the present invention, the semicircular end surface of the water blocking member functions as a water blocking surface, while the exhaust gas hitting the water blocking member changes its flow direction gently due to the inclined surface, and the bottom surface inside the duct. The area of the surface in contact with becomes large. If the slope of the inclined surface of the water blocking member is less than 3/10, the length becomes large, which is uneconomical, and if it exceeds 4/10, the exhaust resistance increases. If the height of the water blocking member is less than 25/100 of the inner diameter of the duct, there is no water blocking effect, and if it exceeds 30/100 of the inner diameter of the duct, exhaust resistance increases.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are side sectional views showing an embodiment of the air conditioning / ventilation duct of the present invention, and sectional views taken along the line II-II in FIG. This air-conditioning / ventilation duct is constructed by installing a water blocking member 3 that prevents rainwater from entering near the outer end of a circular duct 2 that penetrates the outer wall 1 of the building and has its outer end open to the atmosphere. Has been. As shown in detail in FIG. 3, the water shut-off member 3 is in the form of a section obtained by cutting the end of a cylindrical body having the same outer diameter as the inner diameter of the round duct 2 in a plane that diagonally intersects its axis, and The circular end surface 3a is attached to the inner bottom surface of the round duct 2 with an adhesive (not shown) or the like via the arc surface 3b with the circular end surface 3a facing the outer end portion. The inclination of the inclined surface 3c of the water blocking member 3 is 3/10 to 4/10, and the height of the water blocking member 3 is 25/100 to 30/100 of the inner diameter of the round duct 2. . In FIG. 1, reference numeral 4 denotes an L-shaped exhaust pipe connected to the outer end portion of the round duct 2, and reference numeral 5 denotes a blowout slit provided at the end portion of the exhaust pipe 4.

In the air conditioning / ventilation duct having the above structure, the water blocking member 3 is attached to the inner bottom surface of the circular duct 2 through the arc surface 3 b having a relatively large area, and rainwater enters from the exhaust pipe 4. Is prevented by the end surface 3a of the water blocking member 3, and the exhaust gas hitting the water blocking member 3 changes its flow direction gently by the inclined surface 3c as shown by the arrow in FIG.

Here, the pressure loss of the air-conditioning / ventilation duct (duct inner diameter 150 mm, water-stop member slope 40/100, height 40 mm) according to the present invention was measured, and the conventional air-conditioning / ventilation duct (duct The inner diameter is 150 mm and the height of the water stop plate is 40 mm). Therefore, according to the air conditioning / ventilation duct of the present invention, it can be seen that the air resistance of the water blocking member can be significantly reduced as compared with the conventional one.

[0009]

[Effect of device]

 As described above, according to the air conditioning / ventilation duct of the present invention, since the end surface of the water blocking member functions as a water blocking surface, rainwater can be prevented from entering, while the exhaust gas that hits the water blocking member can be gently moved by the inclined surface. Since the flow direction is changed, the air resistance of the water blocking member can be greatly reduced, and the area of the arc surface in contact with the bottom surface inside the duct is larger than in the past, so the mounting of the water blocking member can be stabilized. it can.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of an air conditioning / ventilation duct of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a perspective view of a water blocking member in the air conditioning / ventilation duct of FIG. 1. FIG.

[Fig. 4] Air conditioning / ventilation duct according to the present invention and conventional air conditioning /
It is explanatory drawing which compared the pressure loss of a ventilation duct.

FIG. 5 is a side sectional view of a conventional air conditioning / ventilation duct.

6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 1 Outer wall 2 Round duct 3 Water stop member 3a End surface 3b Arc surface 3c Inclined surface

Claims (3)

[Scope of utility model registration request] 1. An air-conditioning / ventilation duct in which a water blocking member is provided in the vicinity of the outer end of a circular duct whose outer end is open to the atmosphere and which penetrates an outer wall of a building, wherein the water blocking member is a duct. The end of a cylindrical body with the same outer diameter as the inner diameter is cut off in a plane that intersects the axis diagonally, and it is attached to the inner bottom surface of the duct through the arc surface with the semicircular end surface facing the outer end. An air conditioning / ventilation duct characterized by being used. 2. The slope of the inclined surface of the water blocking member is 3/1.
The air-conditioning / ventilation duct according to claim 1, wherein the air-conditioning / ventilation duct is 0 to 4/10. 3. The height of the water blocking member is 2 times the inner diameter of the duct.
The air conditioning / ventilation duct according to claim 2, wherein the air conditioning / ventilation duct is 5/100 to 30/100.