| 摘要 |
PURPOSE:To suppress a loss of energy, by mounting a ring, consisting of elastic material, so be fitted to the periphery of a piezo-electric plate and fixing it holding the ring between a protrusive streak and a pressing member, when the piezo-electric plate, generating flection, is tensely provided in a frame. CONSTITUTION:Piezo-electric plates 8 are provided in both upper and bottom sides of a protrusive streak 2 in the central part of a frame 1 in a pump main unit. A rubber made ring 12, forming in its internal periphery a groove 13, is mounted fitting the groove 13 to the periphery of a vibrative plate 11 of the piezo-electric plate 8, and the rings 12, being closely fitted into the frame from its both upper and bottom sides, are respectively adapted to the protrusive streaks 2. In this way, a loss of energy can be suppressed to a small value by eliminating the necessity for covering an external surface of the piezo-electric plate with an elastic material. |
