| 摘要 |
[Object of the Invention] An object of the present invention is to develop an air curtain device generating parallel air flow based on the knowledge in that parallel air flow generated at the outlet of a turbulent flow runup zone does not include vortex flows and has strong air current interruption performance.;[Disclosure of the Invention] An air curtain device comprises a first ventilation box comprising a discharge elbow provided with guide vanes, a honeycomb, an industrial use ventilating fan, a suction elbow provided with guide vanes, and a pre-filter, wherein the aforesaid elements are sequentially accommodated in a rectangular box whose one side surface is open and an outlet port of the discharge elbow provided with guide vanes and the pre-filter are disposed on the open side surface of the rectangular box, and a second ventilation box of the same structure as the first ventilation box, wherein the first ventilation box is put on an entrance floor with the discharge elbow provided with guide vanes above, and the second ventilation box is put on the entrance floor with the discharge elbow provided with guide vanes below, so that the first ventilation box and the second ventilation box oppose each other at their open side surfaces in a mutually upside-down manner and the first ventilation box and the second ventilation box are distanced from each other by a breadth Xg of the entrance, and wherein an entrance ceiling is provided to a breadth equal to the distance between the ventilation boxes so as to connect a top of the first ventilation box with a top of the second ventilation box, thereby forming an air curtain device entrance, wherein relation between the breadth Xg of the entrance of the air curtain device and a breadth D of the outlet ports of the discharge elbows provided with guide vanes is set at Xg≦5D. |
| 主权项 |
1. An air curtain device comprising a first ventilation box comprising a discharge elbow provided with guide vanes, a honeycomb, an industrial use ventilating fan, a suction elbow provided with guide vanes, and a pre-filter, wherein the aforesaid elements are sequentially accommodated in a rectangular box whose one side surface is open and an outlet port of the discharge elbow provided with guide vanes and the pre-filter are disposed on the open side surface of the rectangular box, and a second ventilation box of the same structure as the first ventilation box, wherein the first ventilation box is put on an entrance floor with the discharge elbow provided with guide vanes above, and the second ventilation box is put on the entrance floor with the discharge elbow provided with guide vanes below, so that the first ventilation box and the second ventilation box oppose each other at their open side surfaces in a mutually upside-down manner and the first ventilation box and the second ventilation box are distanced from each other by a breadth Xg of the entrance, and wherein an entrance ceiling is provided to a breadth equal to the distance between the ventilation boxes so as to connect a top of the first ventilation box with a top of the second ventilation box, thereby forming an air curtain device entrance, wherein relation between the breadth Xg of the entrance of the air curtain device and a breadth D of the outlet ports of the discharge elbows provided with guide vanes is set at Xg≦5D,
and wherein the discharge elbow provided with guide vanes comprises an elbow of rectangular cross section and expansion ratio f of 1<f≦5, and one or more guide vanes disposed in the elbow, while the guide vane or the guide vanes are made of a curved plate and a pair of flat plates connected to the curved plate, with one of them being located in front of the curved plate and the other being located to the rear of the curved plate, wherein m number of sub-channels similar to one another are formed in the elbow based on the following formulas, whereafter the inner sidewall of the elbow is deformed into a curved plate coaxial with the curved plate of the adjacent guide vane to deform n=1 sub-channel into a coaxial bend channel provided with a uniform breadth equal to the inlet breadth b1 of the sub-channel.
p=h/{[f/(f−r)]m−1} (1)an=pr[f/(f−r)]n (2)bn=an/f (3)f=W0/h (4)W=W0−(a1−b1) (5) p: overhang length at the outlet of the elbow h: inlet breadth of the elbow W0: baseline outlet breadth of the elbow W: outlet breadth of the elbow f: expansion ratio of the elbow (f=W0/h, 1<f≦5) r: aspect ratio of the sub-channels (r<f) m: number of sub-channels (m≧2) an: outlet breadth of n-th sub-channel (a0 indicates the radius of curvature of the inner sidewall and am indicates the radius of curvature of the outer sidewall) bn: inlet breadth of n-th sub-channel and wherein the suction elbow provided with guide vanes comprises an elbow of rectangular cross section and contraction ratio f of 1<f≦5, and one or more guide vanes made of a curved plate and flat plates connected to the curved plate disposed so as to make the shapes of the sub-channels defined thereby similar to each other based on the following formulas.
P=h/{[f/(f−r)]m−1} (6)an=Pr[f/(f−r)]n (7)bn=an/f (8) P: overhang length at the inlet of the elbow h: outlet breadth of the elbow W: inlet breadth of the elbow f: contraction ratio of the elbow (f=W/h, 1<f≦5) r: aspect ratio of the sub-channels (r<f) m: number of sub-channels (m≧2) an: inlet breadth of n-th sub-channel (a0 indicates the radius of curvature of the inner sidewall and am indicates the radius of curvature of the outer sidewall) bn: outlet breadth of n-th sub-channel wherein a higher level non-axisymmetric outlet port and a lower level non-axisymmetric outlet port of the air curtain device cooperate so as to form an axisymmetric outlet port of the air curtain device as a whole, a higher level non-axisymmetric jet core screen and a lower level non-axisymmetric jet core screen simultaneously becomes irrotational parallel flows so as to form an upper level parallel flow air curtain and a lower level parallel flow air curtain, whereby the higher level and the lower level oppositely directed air flows form an axisymmetric internally circulating parallel flow air curtain as a whole. |
