| 摘要 |
913,223. Stuffing-box substitutes. CRANE PACKING Ltd. Nov. 16, 1960 [Nov. 17, 1959], No. 38890/59. Class 122 (5). In a rotary shaft mechanical seal in which at least one of the ring members of the seal is split into two or more sections to facilitate its removal or replacement an annular space is provided between mutually opposing surfaces of the split member and another member into or on to which it fits and, after assembly of the seal, the space is filled with a sealing compound. In the seal shown in Fig. 1 a rotary ring 3 sealed to the shaft 1 by an O-ring 4 is carried and driven by a sleeve 5 and urged by springs 7 into facial sealing contact with a non-rotary ring 6 mounted in the shaft housing 2. The rings 3 and 6, the sleeve 5 and the housing 2 are all split in two sections and the ring 6 has a groove 10 in its outer periphery that is filled with viscous sealing compound injected through a radial passage 12 in the housing 2; the passage 12 then being closed by a plug (not shown). 0-rings 11 are provided at each end of the groove 10. The sections of the sleeve 5 are connected by screws and the sections of the ring 3 are urged together by springs 15. The O-rings 11 may be omitted or replaced by rectangular or U-section packing- rings; the O or packing rings being cut at one point only in their periphery, preferably in the form of a scarf joint. The invention may also be applied to a rotary split seal ring 27, Fig. 9, the compound then being injected through a passage 31 into a groove 28 in the inner periphery of the ring and a U-section rubber &c. ring may be interposed between the compound and the shaft 30. Fig. 13 shows the invention applied to split rotary and non-rotary seal-rings 37 and 41, respectively, and to the split sleeve 38, sealing compound being injected to the groove 43 through passage 45 and to the grooves 48 and 50 through passages 52 from a common passage 53. Continuous pressure may be applied to the sealing compound by including a spring- loaded plunger in the closure plugs 46, 54 or by including a resilient member, such as a foam plastic member or an air-filled rubber bag, in the space occupied by the sealing compound.
|
