Composite sealing device applied to piston of hydraulic cylinder, and hydraulic cylinder
A combined sealing and hydraulic cylinder technology, applied in the field of hydraulic cylinders, can solve the problems of increased leakage and inability to completely eliminate leakage, and achieve the effect of good sealing performance
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Embodiment approach 1
[0035] figure 2 shows a schematic structural diagram of the first embodiment of the present invention, Figure 5-Figure 7 It is a structural diagram of some key parts. Wherein, a combined piston capable of reciprocating linear motion in the hydraulic cylinder is installed in the cylinder 12 of the hydraulic cylinder. The combined piston adopts a split detachable structure and includes a first piston body 2 and a second piston body 6 . The left and right ends of the second piston body 6 are respectively fixed with the first support member 4 and the second support member 9 through screw connection. A flange 9A protrudes outward along the axial direction from the right end of the second support member 9 . The left end of the first support member 4 protrudes outward along the axial direction with a flange 4A, and the right end of the first piston body 2 is recessed with a positioning groove 2A matching the left end flange 4A of the first support member 4 . After the flange 4A ...
Embodiment approach 2
[0042] Figure 4 A schematic structural view of the second embodiment of the present invention is shown, wherein the same parts and components as those of the first embodiment use the same reference numerals as those of the first embodiment. For the sake of brevity, the differences between the second embodiment and the first embodiment are mainly described below. The composition of the combined piston in the second embodiment not only includes the first piston body 2 and the second piston body 6, but also includes the third piston body 11 (see Figure 8 ). There is a small radial gap between the outer surface of the third piston body 11 and the inner wall of the cylinder 12 to form a second gap seal; the outer surface of the third piston body 11 is provided with several second annular pressure equalizing grooves 10 parallel to each other; The left end of the third piston body 11 is concavely provided with a positioning groove 11A matching with the flange 9A at the right end ...
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