Svenska Rotor Maskiner Aktiebolag

Abb Air Preheater Inc.

Svenska Rotor Maskiner Ab

Ljungstrom Technology Ab

Kurt Karlsson

Stig Lundin

Birger Pettersson

Frits Soderlund

Dag Westerlund

A method and an arrangement for sensing the clearance between an object and an object-adjacent surface, which is particularly for use in difficult ambient conditions, such as in dirty, corrosive environments and under varying temperature and pressure conditions, e.g. to measure and hold constant the clearance between the sector plates (,) of a regenerative rotary air preheater and the end surfaces of the rotor (,). The sensing device (,) includes a compressed-air operated pipe (,) which is mounted on the object (,) and which includes a sound-emitting opening (,) located adjacent the surface (,), wherein changes in the distance (S) between the object (,) and the surface (,) are represented by changes that occur in the resonant frequency of the pipe (,).

Method and device for sensing a clearance

Device of a rotary regenerative heat exchanger

A regenerative heat exchanger includes first and second parts. The first part is essentially cylindrical, includes a regenerative mass, and is rotatable in relation to the second part around a common center axis. The second part includes axially directed inlets and outlets for heat emitting and heat absorbing media. The inlets and outlets of the second part are mutually separated by sector shaped plates for sealing purposes positioned near to end surfaces of the first part. The sector shaped plates are pivotally connected to axially fixed center plates attached to the second part at ends of the first part, and each of the sector shaped plates includes at a radially outer end thereof a device which has at least one support member including a circular cylindrical sliding shoe for setting a clearance between respective ends of the sector shaped plates and an edge flange provided at each end of the first part. The support member is journalled axially displaceable in a socket at the respective ends of the sector shaped plates perpendicular to the sector shaped plates, and is adjustable by means of a screw mechanism attached to the respective ends of the sector plates. The support member and the socket are provided with a guiding mechanism for preventing turning of the sliding shoe in the socket.

Rotary regenerative heat exchanger

Pack of heat transfer plates

A screw compressor having two rotors (2,3) rotatably journalled for mutual meshing engagement in a respective working chamber (4,5) of a compressor housing (1). For the purpose of regulating the pressure ratio and the capacity of the compressor, a composite slide assembly comprising two slides (17,18) is mounted for axial movement in a recess (6) in the housing (1), the composite slide having two flanks which form a continuous wall in the two working chambers (4,5). The two slides are individually movable and, for the purpose of improving the regulating function one of the slides (18) is provided with a flank which forms a wall of the working chamber (4) of solely one rotor, preferably the male rotor (2).

Screw compressor having two individually displaceable regulating slides

A pack of heat transfer plates for regenerative heat exchangers comprising superimposed profiled plates. Each plate is provided with spaced parallel double ridges protruding symmetrically from both sides of the plate and extending obliquely relatively to the general direction of the fluid flow through the pack. The plates are disposed such that the ridges of one plate lie transverse to the ridges of adjacent plates so that the plates are in contact with each other solely at points spaced along the crests of the ridges.

Regenerative heat exchangers

A rotary regenerative heat exchanger comprises a plurality of moving sector-like rotor compartments carrying regenerative heat exchange material, in which leakage of a gaseous medium having a lower pressure and being trapped by a stationary section plate in the sector-like compartments to a gaseous medium of a higher pressure is at least reduced by the provision of a means for adjusting the sector plate to such an axial clearance with respect to the end of the rotor that an intentional amount of direct leakage of the high pressure medium is maintained between the rotor end and the sector plate, giving rise to forcing out the low pressure medium from compartments that are about to leave the low pressure medium passage and replacing it with high pressure medium.

Growing community of inventors

Tyreso, Sweden

Kurt Karlsson