IPC 6 English version F22D-F22D 11/06

F22D-F22D01106

SECTION F– MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F 22

STEAM GENERATION (chemical or physical apparatus for generating gases B 01 J; chemical generation of gas, e.g. under pressure, Section C; removal of combustion products or residues, e.g. cleaning of the combustion contaminated surfaces of tubes of boilers, F 23 J; generating combustion products of high pressure or high velocity F 23 R; water heaters not for steam generation F 24 H, F 28; cleaning of internal or external surfaces of heat-transfer conduits, e.g. water tubes of boilers, F 28 G)

F 22 D

PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; FEED-WATER SUPPLY; CONTROLLING WATER LEVEL; CIRCULATING WATER WITHIN BOILERS (chemical treatment of water, e.g. purification, C 02 F; enclosed heat-exchange apparatus in general F 28 D; controlling in general G 05)

Feed-water heaters, e.g. preheaters

with water tubes arranged in the boiler furnace, fire tubes, or flue ways (heat-exchange tubes in general F 28 F)

the tubes having plain outer surfaces, e.g. in vertical arrangement

in horizontal arrangement

the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement

in horizontal arrangement (hollow fire-bars, grates, or the like used as water tubes F 23 H 3/02)

Control devices, e.g. for regulating steam temperature

Safety or venting devices (safety devices for boilers in general F 22 B 37/42)

with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways

and heated indirectly

and directly connected to boilers

and provided for rotary movement

with fire tubes or flue ways traversing feed-water vessels

with means, other than tubes, to separate water and heating medium, e.g. bulk heaters without internal flues or tubes, jacketted smoke-boxes or flues

for direct heat transfer, e.g. by mixing water and steam

with stages, steps, baffles, dishes, circular troughs, or other means to cause interrupted or cascading fall of water

arranged to be heated by steam, e.g. bled from turbines

and returning condensate to boiler with main feed supply

Water and air preheating systems

Constructional features of water and air preheating systems

Combinations of exhaust-steam and smoke-gas preheaters (for locomotives F 22 D 1/42)

specially adapted for locomotives

Smoke-gas preheaters

Exhaust-steam preheaters

Details

incorporating thermal de-aeration of feed-water (de-aeration produced in the course of direct heat transfer F 22 D 1/28; thermal de-aeration of water per se B 01 D 19/00, C 02 F 1/20; valves for venting F 16 K 24/04) [3]

Accumulators for preheated water

arranged within combustion chambers

combined with steam accumulators

directly connected to boilers

specially adapted for locomotives (locomotive boilers F 22 B 13/06)

Control devices (controlling water feed to boilers, or water level F 22 D 5/00)

Controlling water feed or water level; Automatic water feeding or water-level regulators (steam traps F 16 T; measuring or indicating instruments G 01; for indicating water level G 01 F; level control in general G 05 D 9/00)

with an intermediate compartment from which the water is fed by gravity after mechanically moving the compartment, the movement being controlled according to water level

with pivoting buckets

with receptacles external to, but in free communication with, the boilers and adapted to move up and down in accordance with change in water level

with float-actuated valves

and with pistons or membranes unitary with the feed inlet valves

and with dipping tubes

responsive to thermal expansion and contraction, e.g. of solid elements

of fluids

for varying the speed or delivery pressure of feed pumps

without floats

with floats

with electric switches

Automatic feed-control systems (automatic safety devices F 22 B 37/42; controlling in general G 05)

responsive to amount of steam withdrawn; responsive to steam pressure

responsive to both water level and amount of steam withdrawn or steam pressure

influencing the speed or delivery pressure of the feed pumps

Applications of valves (valves per se F 16 K)

for feeding a number of steam boilers designed for different ranges of temperature and pressure

Auxiliary devices or apparatus for promoting water circulation

Saddles or like directing plates fitted to furnace tubes

Injectors for water or steam

Rotary devices, e.g. propellers

Arrangements of pumps, e.g. outside the boilers

within the boilers

Control devices

specially adapted for locomotive boilers

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Feed-water supply not provided for in other main groups

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Arrangements of feed-water pumps (F 22 D 11/06 takes precedence; pumps per se F 04)

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with means to eliminate steam formation

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for returning condensate to boiler