Crankcase air valve structure and air compressor

1 . A crankcase air valve structure, comprising an air intake valve and a valve seat plate which are sequentially mounted on an end surface of a crankcase, wherein

the valve seat plate is provided with at least one group of air intake holes;

the air intake valve is provided with at least one valve plate, each of the at least one valve plate having root portions located at two ends thereof and lug portions located between the two ends, and each of the at least one valve plate being connected to a valve body of the air intake valve via the root portions;

wherein the crankcase air valve structure further comprises sidestep grooves and accommodating recesses which are in communication with a gas channel of the crankcase are provided in the end surface of the crankcase;

wherein, in a non-air intake state, each of the at least one valve plate covers a corresponding group of air intake holes; and

wherein, in an air intake state, the lug portions abut against corresponding accommodating recesses, and the root portions are bent toward corresponding sidestep grooves.

2 . The crankcase air valve structure of claim 1 , wherein a width of the root portion at an end connected to the valve body is greater than a width of the root portion at an end connected to the valve plate.

3 . The crankcase air valve structure of claim 1 , wherein two ends of the valve plate are symmetrical about a center of the valve plate.

4 . The crankcase air valve structure of claim 1 , wherein each group of air intake holes comprises a plurality of circular holes, wherein some adjacent circular holes of the circular holes are in communication with each other.

5 . The crankcase air valve structure of claim 1 , wherein the valve seat plate is further provided with an exhaust hole, and the air intake valve is further provided with a hollowed-out portion corresponding to the position of the exhaust hole.

6 . An air compressor, wherein the air compressor is configured with a crankcase air valve structure of claim 1 .

7 . The crankcase air valve structure of claim 1 , wherein a bottom wall of each of the accommodating recesses is inclined such that a depth of the accommodating recess gradually increases from a middle portion of the accommodating recess to an edge portion of the accommodating recess close to the sidestep groove.

8 . The crankcase air valve structure of claim 7 , wherein the depth of the accommodating recess at the edge portion is greater than a thickness of the lug portions.

9 . The crankcase air valve structure of claim 1 , wherein a bottom wall of each of the sidestep grooves is inclined such that a depth of the sidestep groove gradually increases from a middle portion of the sidestep groove to an edge portion of the sidestep groove close to the accommodating recess.

10 . The crankcase air valve structure of claim 9 , wherein a slope of the bottom wall of the sidestep groove is determined according to a maximum curvature of the root portion.

11 . The crankcase air valve structure of claim 1 , wherein the valve seat plate is provided with a plurality of groups of air intake holes;

the air intake valve is provided with a plurality of valve plates, wherein root portions of two adjacent valve plates are connected by means of a connecting bridge, and each connecting bridge fits with an sidestep groove; and

in the air intake state, the connecting bridge is bent toward a corresponding sidestep groove.

12 . The crankcase air valve structure of claim 11 , wherein the plurality of groups of air intake holes are symmetrical about a center of the gas channel.