Seal assembly for use in harsh environments

Seal assembly for use in harsh environments

PATENTS stationary case (10) with at least one intake port (14) and/or exhaust port (15). The outer surface (16) of the rotating block (11) is a rotat...

159KB Sizes 0 Downloads 23 Views

PATENTS stationary case (10) with at least one intake port (14) and/or exhaust port (15). The outer surface (16) of the rotating block (11) is a rotational surface with a straight line, or curved profile, on which transverse and/or side sealing parts (which are placed in the stationary case) sit. In circular side grooves (2) there is a side seal comprising circular, side sealing segments (1), which are always placed between neighbouring transverse sealing strips (3) that are placed in transverse grooves (4). These sealing strips go through the side grooves (2). In the place where the side sealing segments (1) and transverse sealing strips (3) meet, there are joints (5) with notches (7) for inserting the side sealing segments (1) and transverse sealing strips (3). Patent number: WO/2013/189471 Inventor: V. Knob Publication date: 27 December 2013

Static turbine parts seal Applicant: Alstom Technology Ltd, Switzerland This invention relates to a seal (1) between static components (2 & 3) of a turbine. The seal consists of at least one middle piece (6), which has at its opposite ends end-pieces (7 & 8). These are arranged in the a respective groove (4, 5) of the

An objective of this invention is to create a robust seal of the “dog-bone” type for sealing between static components, especially in turbines. Compared with the known stateof-the-art dog-bone seals, it has a higher flexibility with respect to relative movement of turbine components and better fits the engine architecture. Furthermore, it reduces wear with ageing and maintains good sealing performance during operation. Patent WO/2013/189883 has further details.

June 2014

static components (2, 3), adjoining the inside surfaces of the grooves. The middle piece (6) consists of at least two parts (6’ & 6’’) which are coupled to one another (but are able to rotate) via a pivot (9). The pivot is an annular ring in cross-section, formed by at least two cylindrical elements being coaxially inter-fitted and capable of sliding relative to each other. The inner surface of the pivot (9) is wrapped with a metallic cloth material. Specific advantages of this invention included higher flexibility, because of the pivoting action, to accommodate larger relative movements of the turbine components and reduced wear with ageing, whilst maintaining good sealing performance. Patent number: WO/2013/189883 Inventors: H. Hanumanthan and C. Georgakis Publication date: 27 December 2013

“Swellable” packer with enhanced operating envelope Applicant: Halliburton Energy Services Inc, USA This disclosure relates generally to equipment used, and operations performed, in conjunction with a subterranean well. One example described covers a “swellable” packer with an enhanced operating envelope. This packer may include a base pipe, at least one swellable seal on the base pipe – the seal comprising a swellable material – and at least one other swellable seal on the base pipe (the other swellable seal comprising another swellable material, with these swellable materials being different). Another swellable packer can include at least one swellable seal, the seal comprising a swellable material, and at least one other swellable seal (the other swellable seal comprising another swellable material), wherein one swellable seal displaces the other into contact with a well surface, in response to contact being made between the one swellable seal and an activating agent. Patent number: WO/2013/191687 Inventor: K. Solhaug Publication date: 27 December 2013

Seal assembly for use in harsh environments Applicant: QTRCO Inc, USA This patent provides details of a sealing assem-

bly, for example, a piston ring, for use in harsh environments, such as an area where radiation levels are particularly high. The piston ring has an annular sealing surface which, together with a member forming a radially outer annular cylinder surface (for instance, a cylinder), forms a seal pocket. In this pocket is located an annular seal that comprises a plurality of wraps of at least one strand of a substantially incompressible and inelastic material, such as graphite fibre. The assembly further includes a compression ring and associated assembly that compresses the seal body between the support surface and the compression ring to displace the seal body into sealing engagement with the radially inner and outer sealing surfaces. Patent number: WO/2013/192092 Inventors: E. Holtgraver and J. Howard Publication date: 27 December 2013

Ball screw, seal material and structure Applicant: Nitta Corp, Japan Details are provided of a ball screw that effectively minimises the intrusion of fine foreign matter between the male and female members, and that is capable of reducing sliding resistance when the male member is fitted to sealing material. The ball screw is provided with: a male member, in which >ʓ>iÊ}ÀœœÛiʈÃÊvœÀ“i`ÆÊ>Êvi“>iʓi“LiÀÊ̅>ÌÊ has an inner peripheral surface in which a female groove is formed, and in which is also formed a VˆÀVՏ>̈œ˜Ê«>̅Ê̅ÀœÕ}…Ê܅ˆV…ÊL>ÃÊV>˜ÊVˆÀVՏ>ÌiÆÊ and a seal material that is provided at one end and/or the other end of the female member in its axial direction. The male member and the female member are fitted together in the axial direction. The seal material is provided with: a layer that is made from fibres impregnated with rubber or resin, and that includes a hole, which exposes the inner peripheral surface of the female member, and a fitting surface on which a convex section is formed that is capable of fitting together with the male groove. The material also includes a resin layer that is applied to the side opposite to that of the fibre layer in which the hole is formed. Patent number: WO/2013/191157 Inventors: Y. Ishizaki, Y. Kiyohara, K. Aoki, K. Nakai, Y. Aoki, T. Kojima, M. Yamada and T. Taira Publication date: 27 December 2013

Sealing Technology

15