초록 ▼

An inside/outside air switching device for a vehicle is constructed of an integrated case and a rotary door. The case has an inside port and an outside port, and a plate rib protrudes inside the case from a portion between the inside port and the outside port. The rotary door has seal members protru

An inside/outside air switching device for a vehicle is constructed of an integrated case and a rotary door. The case has an inside port and an outside port, and a plate rib protrudes inside the case from a portion between the inside port and the outside port. The rotary door has seal members protruding toward outside from a body plate of the rotary door. A clearance is provided between a wall surface of the case and a protrusion top end of the plate rib, so that the seal members of the rotary door can be displaced from a side of the inside port to a side of the outside port through the clearance when the rotary door is assembled from the inside port into the integrated case.

대표청구항 ▼

An inside/outside air switching device for a vehicle is constructed of an integrated case and a rotary door. The case has an inside port and an outside port, and a plate rib protrudes inside the case from a portion between the inside port and the outside port. The rotary door has seal members protru

An inside/outside air switching device for a vehicle is constructed of an integrated case and a rotary door. The case has an inside port and an outside port, and a plate rib protrudes inside the case from a portion between the inside port and the outside port. The rotary door has seal members protruding toward outside from a body plate of the rotary door. A clearance is provided between a wall surface of the case and a protrusion top end of the plate rib, so that the seal members of the rotary door can be displaced from a side of the inside port to a side of the outside port through the clearance when the rotary door is assembled from the inside port into the integrated case. the at least one fume hood to an inlet duct in fluid communication with the at least one fume hood; conveying the toxic exhaust to at least two exhaust stacks by a fan, each stack having a return duct with a return damper and a discharge duct with a discharge damper, wherein the return duct returns air and/or toxic exhaust to the inlet duct and the discharge duct discharges toxic exhaust to the environment; measuring the flow of toxic exhaust in the inlet duct, wherein the discharge dampers are adjusted such that the total flow from the discharge ducts is approximately equal to the flow of toxic exhaust in the inlet duct; measuring the static pressure at the inlet duct, wherein an inlet duct static pressure set point is maintained by adjustment of the return dampers; and measuring the static pressure at the at least two exhaust stacks, wherein an outlet duct static pressure set point is maintained by adjustment of the speed of the exhaust fan. 14. The method of claim 13, further comprising transmitting an input signal to a controller of the flow of toxic exhaust, static pressure at the inlet duct, and static pressure at the at least two exhaust stacks. 15. The method of claim 14, further comprising modulating the fan, the return damper, and the discharge damper. 16. The method of claim 14, wherein the controller is a programmable logic controller adapted to receive and transmit a plurality of input and output signals. 17. The method of claim 13, wherein the return damper and the discharge damper for each stack are interlocked. 18. The method of claim 13, further comprising manually adjusting a manual damper in the return duct. 19. The method of claim 13, further comprising adjusting an inlet duct damper. 20. The method of claim 19, wherein the controller is further adapted to modulate the inlet duct damper. 21. The method of claim 13, wherein the fan is a variable-speed fan. 22. The method of claim 13, wherein the velocity and momentum of the discharge of toxic exhaust to the environment is maintained by changing the number of stacks in operation.