Air purifying negative pressure device

Abstract

A housing configuration includes a filter chamber having a purifying filter, a rear chamber in the back, and a fan chamber having a fan. In this housing configuration, a measurement port for purifying filter performance evaluation is provided in a substantially middle portion of the rear chamber, and a connecting portion connected to the measurement port and a cover for maintenance work are provided on the front surface of the housing. Provided as a result is an air purifying negative pressure device that is compact in configuration, can be installed with ease, and is capable of improving both the accuracy of an air purifying filter performance evaluation test and the workability of routine maintenance.

What is claimed is: 
     
         1 . An air purifying negative pressure device comprising:
 a filter chamber including suction portion provided on a front surface of a housing to suction fine particle-containing air in a room and a purifying filter purifying the air suctioned into the suction portion by passage to a back;   a rear chamber including a duct providing an air flow path extending in a direction substantially orthogonal to a flow path direction of the air passed to the back through the purifying filter and a suction port provided at a substantially middle position of a front wall surface of the duct in a longitudinal direction to suction the air in the duct;   a fan chamber including a fan suctioning the air flowing out of the rear chamber forward, a fan motor rotationally driving the fan, an exhaust port laterally discharging the air suctioned by the fan, and a cover allowing the front surface of the housing to be opened; and   a connecting portion allowing a measuring instrument outside the housing to measure a purification performance of the purifying filter to be connected to the suction port from the front surface of the housing.   
     
     
         2 . The air purifying negative pressure device according to  claim 1 , further comprising a rectifying member performing air flow adjustment near the suction port,
 wherein the rectifying member is provided on the front wall surface of the duct.   
     
     
         3 . The air purifying negative pressure device according to  claim 2 , wherein the rectifying member has an L shape in which a surface orthogonal to the air flow path direction in the duct is provided on a downstream side of the suction port in the air flow path direction. 
     
     
         4 . The air purifying negative pressure device according to  claim 3 , wherein the rectifying member is provided with an opening portion in the surface orthogonal to the air flow path direction in the duct. 
     
     
         5 . The air purifying negative pressure device according to  claim 2 , wherein the rectifying member is disposed near the suction port by inclining a mountain crest-shaped member with respect to the air flow path direction in the duct. 
     
     
         6 . The air purifying negative pressure device according to  claim 2 , wherein the rectifying member has an upright shape in which a surface orthogonal to the air flow path direction in the duct is provided on an upstream side of the suction port in the air flow path direction. 
     
     
         7 . The air purifying negative pressure device according to  claim 1 , wherein the purifying filter is replaceable from the front surface of the housing by opening the suction portion. 
     
     
         8 . The air purifying negative pressure device according to  claim 2 , further comprising a suction unit at an inlet of suction from the rear chamber to the fan chamber,
 wherein performance evaluation accuracy of the purifying filter is adjustable by adjusting a shape of the rectifying member, an inner diameter of the suction unit, a fin diameter of the fan, and a rotation speed of the fan in association with each other.   
     
     
         9 . The air purifying negative pressure device according to  claim 1 , further comprising a suction unit at an inlet of suction from the rear chamber to the fan chamber,
 wherein a degree of negative pressure in the room is adjustable by adjusting an inner diameter of the suction unit, a fin diameter of the fan, and a rotation speed of the fan.