Air filter essentially for use in woodworking workplace

1. An air filter essentially for use in woodworking workplaces, comprising:

a casing having a top panel, a bottom panel and two sidewalls, the casing having an inlet anteriorly and an outlet, the casing having therein an inner blocking wall seamlessly connected to the top panel and the bottom panel, wherein left and right edges of the inner blocking wall extend rearward to form two inner sidewalls, respectively, wherein the two inner sidewalls are seamlessly connected to the top panel and the bottom panel, and the rear ends of the two inner sidewalls are seamlessly connected to the two sidewalls, wherein the two inner sidewalls are each penetrated by a through hole, and the two through holes face each other, wherein the through holes of the two inner sidewalls are in communication with the inlet, wherein the casing further has a curved panel bending in its thickness direction, such that its two edges seamlessly connect to the two inner sidewalls, allowing the curved panel and the two inner sidewalls to together define a receiving space, the receiving space being in communication with the outlet, the inner blocking wall being spaced apart from the inlet by a predetermined distance, wherein left and right lateral edges of the inner blocking wall are spaced apart from the two sidewalls by a predetermined distance;

a filter gauze disposed at the casing and covering the inlet;

a motor fixedly disposed at the casing and disposed in the receiving space; and

a plurality of whizzer blades disposed at the motor and in the receiving space, wherein the curved panel curves to an extent corresponding in curvature to part of outer edges of the whizzer blades and is spaced apart from the whizzer blades by a predetermined distance, wherein the whizzer blades axially face the through holes of the two inner sidewalls and are driven by the motor to draw in air via the through holes of the two inner sidewalls and then discharge the air via the outlet.

2. The air filter essentially for use in woodworking workplaces according to claim 1 , wherein the two inner sidewalls are parallel, and rear segments of the two sidewalls extend rearward, extend toward each other arcuately, and connect to the two inner sidewalls seamlessly.

3. The air filter essentially for use in woodworking workplaces according to claim 1 , wherein the curved panel extends toward the motor to form a fixing wall and partition the receiving space into two sub-spaces, the motor being fixedly disposed on the fixing wall and having a driving axle with two ends exposed from two sides of the motor, wherein a plurality of said whizzer blades is disposed at each said end of the driving axle, allowing the two plurality of said whizzer blades to be disposed in the two sub-spaces, respectively.

4. The air filter essentially for use in woodworking workplaces according to claim 1 , wherein the curved panel is spaced apart from the inner blocking wall by a predetermined distance.

5. The air filter essentially for use in woodworking workplaces according to claim 1 , wherein the curved panel and the inner blocking wall are seamlessly connected.

6. The air filter essentially for use in woodworking workplaces according to claim 1 , wherein a guiding wall is disposed around each said through hole of a corresponding one of the inner sidewalls and extends obliquely toward the center of the through hole and toward the receiving space.

7. The air filter essentially for use in woodworking workplaces according to claim 1 , wherein a top edge and a bottom edge of the inner blocking wall extend forward to form an upper restrictive platform and a lower restrictive platform, respectively, and the filter gauze has a dust collector, wherein space between the upper restrictive platform and the lower restrictive platform receives the plurality of dust collectors of the filter gauze and is large enough to allow for unfolding the plurality of dust collectors.

8. The air filter essentially for use in woodworking workplaces according to claim 1 , wherein distance between the curved panel and each of the outer edges of the two plurality of whizzer blades increases toward the outlet along the direction of rotation of the two plurality of whizzer blades.

9. The air filter essentially for use in woodworking workplaces according to claim 1 , wherein the outlet is posteriorly disposed at the casing.