Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
  • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
  • F28D19/047—Sealing means

Definitions

• the present invention relates to a regenerative heat exchanger of the kind specified in the preamble of the attached claim 1.
• a heat exchanger of this kind is known from for instance SE 9302148- 3, which discloses support means in the shape of sliding shoes made of carbon or graphite.
• This is a material that will not be rapidly destroyed by the corrosive atmosphere that is prevailing where the sliding shoes are positioned and that can resist the actual high temperatures.
• the material has excellent lubrication properties and deposits a friction reducing layer of carbon or graphite on the flanges against which the sliding shoes are sliding. This results, however, at the same time in an abrasion of the sliding shoes that has proved to be difficult to foresee. For that reason it has been necessary for this kind of sliding shoes to complete the sliding shoes with measuring devices, which measure the clearance between the sector plates and the the flanges and enable in time, i.e. before the sector plates start scraping against the flanges, a screwing forward of the support means or sliding shoes a predetermined distance so that the intended clearance is restored.
• the object of the invention is to obtain a solution of the problem consisting in the rapid wearing down of the support means or sliding shoes.
• the invention is based on the observation that the support means during operation are wearing in in conformity with the shape of the flanges and the irregularities present on the surface of the flanges, which occurs after a rather short time. After that the wearing is more moderate.
• a screwing forward of the support means is performed during turning of the support means an arbitrary angle.
• the scratches made by abrasion in the contact surfaces of the support means by the respective flanges shall get into exact the same angular position as before. Accordingly, new scratches will be made by abrasion forming an angle with the former scratches at each adjustment, which will result in an even more rapid wearing down at each adjustment than is the case after a change of sliding shoes.
• the support means is, according to a preferred embodiment of the invention, unrotatably attached to a carrier movably journalled in the socket, which carrier is prevented from turning in the socket by guiding means.
• the guiding means acting between the socket on one hand and the carrier and/or the support means on the other hand comprises preferably of a groove in one of the parts in which a pin protrudes attached to the other part.
• fig.l is a partial axial section through the heat exchanger
• fig.2 is an axial section through a device with a sliding shoe at the end of a sector plate along line II-II of fig.l
• fig.3 is a section along line III-III of fig.2 of a detail illustrating the guiding means of the carrier.
• the heat exchanger shown in fig.l is of conventional type having a stationary casing 1 and a cylindrical rotor 2 containing the regenerative mass 3.
• the rotor has a hub 4 and an upper fixed sector plate 5 with a movable sector plate 6 pivotally connected thereto and a corresponding lower fixed centre plate 7 and a movable sector plate 8.
• the two sets of plates 5,6 and 7,8 have the function to seal against the upper and lower ends of the rotor 2 as tight as possible and thereby separate the heat exchanging media flowing through the rotor
• each of the movable sector plates 6,8 are provided with at least one device, preferably two devices 10, which forms an adjustable support means 11 for maintaining a certain clearance between the ends of the sector plates 6,8 and an upper and a lower annular edge flange 12 attached to the rotor 2 along its upper and lower peripheries.
• Each device further comprises a measuring device 13 for checking the clearance as shown more in detail in Fig.2 and the said SE 9302148-3.
• the sector plates 6,8 may be rotatable in a manner known per se, and the regenerative mass stationary.
• Fig.2 illustrates a part of the casing 1 and the upper end flange 12 of the rotor 2 and the upper movable sector plate 6.
• one of the devices 10 is fixed by screws.
• the device 10 includes an outer sleeve 15 with a mounting flange 16, which with an intermediate sealing ring 17 is attached to the sector plate 6 by means of screws 18.
• the outer sleeve 15 has a lid 19 and within the outer sleeve 15 there is an inner sleeve 20 having an upper part provided with a fixedly attached lid 21.
• the outer sleeve 15 is provided with a packing 22, which sealingly contacts the exterior of the inner sleeve 20.
• the lid 21 on the upper end of the inner sleeve 20 is provided with an axial exterior groove 23 and its lower end is provided with a bottom plate 24 welded thereto.
• a circular sliding shoe 25 made of graphite or carbon is exchangeably attached by means of a recessed screw 26 screwed into the bottom plate 24.
• the upper end of the outer sleeve 15 is provided with a radial threaded hole 27 into which a screw 28 is screwed which has a pin 29 protruding into the groove 23 thereby preventing turning of the inner sleeve 20 and the sliding shoe 25 in the outer sleeve 15 acting as a socket for the inner sleeve and sliding shoe.
• a measuring device 13 is provided close at the side thereof within a flexible bellow 30 extending between the casing 1 and the sector plate 6. It comprises a tube 40 attached with its lower end in a hole 41 in the sector plate 6 and with its upper end in a hole 42 of a flange 31 attached to the outer sleeve 15. Inside the tube 40 there is a measuring rod 43, the upper end of which coacting with a measuring member, not shown, for indicating the actual clearance between the underside of the sector plate and upper surface of the edge flange 12.
• the purpose of the measuring device 13 is a continuous supervision of the wearing of the sliding shoe 25 at the movement of the flange 12 with respect to the sliding shoe.
• a simple and efficient device for this purpose comprises a hole 50 in the lid 21 in which a rod 51 is rotatably joumalled and with a fine-pitch part extends through a fine-pitch hole 52 in the lid 19.
• the sliding shoe 25 will be displaced in relation to the sector plate 6 by turning of the rod 51.
• the angular adjustment of the rod 51 can be locked by two locking nuts 53, which are tightened mutually and against the lid 19.
• the adjustment of the rod 51 can, as an alternative, be obtained by a self-locking gear, which displaces a rod with smooth surface, fixedly connected to the lid 21, and extending through a hole in the lid 19.
• a clearance of for example 4 rrm is adjusted between the sector plate 6 and the edge flange 12 by turning the rod 51 by means of a key, not shown, attached to the rod, which clearance can be read off by depressing the measuring rod 43 against the edge flange 12 and reading e.g. scale marks at the upper end of the rod.
• the inner sleeve 20 is locked in relation to the outer sleeve 15 by tightening the locking nuts 53.
• the measuring rod 43 is arranged to spring back again to an initial position with the lower end surface flush with the underside of the sector plate 6 when depression of the rod ceases.
• the sliding shoe 25 is exposed to wearing during operation and the sector plate 6 is slowly sinking towards the edge flange 12 to a corresponding degree.
• the actual clearance after some time of operation is checked by a slight depression of the rod 43 and reading of the magnitude of the depression.
• the abrasion is rapid and the inner sleeve 20 must be screwed up and the sliding shoe be replaced. After that the inner sleeve is screwed in position again and a correct clearance is set. Then the abrasion will be essentially slower depending on the fact that a layer of carbon or graphite is deposited on the edge flange 12 by the first sliding shoe, which deposition is lubricating.
• the right hand half of Fig.2 illustrates the device 10 provided with a fresh sliding shoe 25, and the left hand half illustrates a consumed sliding shoe 25.
• the sliding shoe 25 can have an essentially larger height - essentially up to the lid 21 - if the guiding means 23,27-29 is adapted correspondingly.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Power Steering Mechanism (AREA)
• Braking Arrangements (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)
• Separation By Low-Temperature Treatments (AREA)
• Multiple-Way Valves (AREA)
• Processing Of Solid Wastes (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
• Fuel Cell (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20398560

Family Applications (1)

Country Status (12)

Cited By (5)

Citations (3)

• 1995
  • 1995-06-08 SE SE9502100A patent/SE504462C2/sv not_active IP Right Cessation
• 1996
  • 1996-05-31 PL PL96323794A patent/PL180711B1/pl unknown
  • 1996-05-31 HU HU9901902A patent/HU220426B/hu not_active IP Right Cessation
  • 1996-05-31 DE DE69611827T patent/DE69611827T2/de not_active Expired - Fee Related
  • 1996-05-31 WO PCT/SE1996/000713 patent/WO1996041996A1/en active IP Right Grant
  • 1996-05-31 AT AT96917770T patent/ATE199287T1/de not_active IP Right Cessation
  • 1996-05-31 ES ES96917770T patent/ES2155939T3/es not_active Expired - Lifetime
  • 1996-05-31 EA EA199800032A patent/EA000246B1/ru not_active IP Right Cessation
  • 1996-05-31 PT PT96917770T patent/PT830555E/pt unknown
  • 1996-05-31 EP EP96917770A patent/EP0830555B1/en not_active Expired - Lifetime
  • 1996-05-31 CZ CZ19973956A patent/CZ287006B6/cs not_active IP Right Cessation
• 2001
  • 2001-05-18 GR GR20010400744T patent/GR3035891T3/el not_active IP Right Cessation

Patent Citations (3)

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