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An air pulser includes a housing. The interior of the housing is divided into an air supply chamber and an exhaust chamber by a diaphragm formed with an aperture. An air injection tube is provided in the air supply chamber and configured to be selectively opened and closed by the diaphragm. The exha

An air pulser includes a housing. The interior of the housing is divided into an air supply chamber and an exhaust chamber by a diaphragm formed with an aperture. An air injection tube is provided in the air supply chamber and configured to be selectively opened and closed by the diaphragm. The exhaust chamber is divided into first and second chambers by a valve plate formed with a valve hole. In the second chamber, a guide tube is fixedly mounted in which a valve body is slidably supported. The valve body carries a permanent magnet adapted to be attracted to the valve plate and carrying a suction disk. A seal member is disposed between the guide tube and the valve plate. A plurality of radial grooves having a V-shaped cross-section are formed on the surface of the valve plate facing the suction plate at its radially inner portion.

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What is claimed is: 1. An air pulser comprising: a housing defining an inner space; a diaphragm extending in said inner space to divide said inner space into an air supply chamber and an exhaust chamber, said diaphragm being formed with an aperture through which said air supply chamber communicates

What is claimed is: 1. An air pulser comprising: a housing defining an inner space; a diaphragm extending in said inner space to divide said inner space into an air supply chamber and an exhaust chamber, said diaphragm being formed with an aperture through which said air supply chamber communicates with said exhaust chamber; an air injection tube provided in said air supply chamber and configured to be selectively opened and closed by said diaphragm; a valve plate provided in said exhaust chamber and dividing said exhaust chamber into a first chamber and a second chamber, said valve plate being formed with a valve hole through which said first and second chambers communicate with each other; a spring mounted in said first chamber for biasing and deforming said diaphragm such that said air injection tube is closed by said diaphragm; a valve body provided in said second chamber for selectively opening and closing said valve hole, said valve body having a recessed surface formed at a radially outer periphery at an upper end thereof facing said valve plate; a guide tube provided in said second chamber and supporting said valve body so as to be movable in an axial direction relative to said valve plate, said guide tube being formed with vent holes at both ends thereof, said second chamber communicating with the interior of said guide tube through said vent holes; a permanent magnet mounted to said valve body and configured to be attracted to said valve body to keep said valve body in a closed position wherein said valve hole is closed by said valve body, said housing being formed with an air supply port through which compressed air is fed into said air supply chamber, and an exhaust port through which air in said second chamber is exhausted; a suction disk mounted on an upper surface of said permanent magnet that faces said valve plate, said valve plate being formed with a plurality of angularly spaced apart radial grooves in a bottom surface thereof axially facing said suction disk, said surface of said valve plate being located at a radially inner portion of said valve plate; and a seal member disposed between said valve plate and said guide tube and including an annular seal body and an annular seal lip projecting radially inwardly from said annular seal body, said seal lip being configured to be elastically pressed against said recessed surface of said valve body; wherein said valve plate has an annular groove formed therein so as to face said annular seal lip; wherein said seal lip is disposed between and axially faces said annular groove and said recessed surface; wherein said annular groove is communicated with said valve hole through said radial grooves when said valve body is in said closed position; wherein said seal lip has a flat bottom surface portion extending substantially perpendicular to said axial direction, and said recessed surface has an axially facing portion so as to axially face said flat bottom surface portion of said seal lip and such that said flat bottom surface portion of said seal lip is configured to be pressed against said axially facing portion of said recessed portion; wherein said seal lip further has a radially inwardly facing surface; wherein said recessed surface further has a radially outwardly facing portion; wherein, in said closed position of said valve body, said radially inwardly facing surface of said seal lip radially faces said radially outwardly facing portion of said recessed surface; wherein said valve plate has an annular seal groove formed in a bottom surface thereof; wherein said seal body of said seal member is engaged in said annular seal groove of said valve plate; wherein said annular seal groove opens in an axially downward direction; wherein said suction disk has an axially facing surface that faces said surface of said valve plate having said angularly spaced apart radial grooves therein; and wherein said axially facing surface of said suction disk is a solid flat surface in a portion thereof that faces said angularly spaced apart radial grooves of said valve plate. 2. The air pulser of claim 1 wherein said plurality of radial grooves are angularly spaced apart at equal angular intervals and have a V-shaped cross-section. 3. The air pulser of claim 1, wherein said seal lip is arranged such that, when said valve body is in said closed position, said seal lip elastically contacts said recessed surface and, when pressure in said first chamber increases, a contact pressure of said seal lip against said recessed surface increases. 4. The air pulser of claim 1, wherein said valve body is arranged such that, in said closed position of said valve body, said suction disk contacts said valve plate.