| 摘要 |
<p>The present invention refers to a valve system for compressors, preferably used in refrigeration, which comprise a piston with an alternating movement and valves such as flexible pallet. The suction valve comprises a double flexible pallet (21), formed by at least two overlapped and flexible blades (11) and (12), preferably of similar geometry, fastened by the basis, so that the movable end, which is over the orifice for fluid suction (4), does not have mechanical link, allowing the flexible blades (11, 12) to freely slide. The overlapping of these flexible blades (11,12) is used so that, during the movement for opening the valve, there is relative sliding of the up- per blade (31), inverse in relation to the relative sliding of the lower blade (32), and the friction of this sliding causes effect of damping of the valve movement. This friction between the flexible blades (11,12) which constitute the double flexible pallet (21) results from the coefficient of friction among the materials of the flexible blades (11,12), as well as, in a preferred embodiment, by the lubricating oil film that is housed between the flexible blades (11, 12) and by the relative pressure between the blades due to the bending movement. This effect of damping of the movement of the suction valve allows it to be projected so that it has little elastic force and is easily opened, improving the flow of the refrigerant fluid that fills up the cylinder, without the negative effects from excessive opening and from the oscillations of the double flexible pallet (21), thus improving the efficiency and capacity of the compressor, apart from reducing the generation of acoustic waves and noise.</p> |
