IPC 6 English version F25B !A-F25B 49/04

F25-F25B04904

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

F 25

REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES

F 25 B

REFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS (pumps, compressors F 04; use of heat pumps for domestic or space-heating or for domestic hot-water supply F 24 D; air-conditioning, air-humidification F 24 F; fluid heaters using heat pumps F 24 H)

Notes

(1)

Attention is drawn to Note (2) following the title of subclass F 24 F. [5]

(2)

When classifying heat pump circuits or systems, groups F 25 B 1/00 to F 25 B 25/00 and F 25 B 29/00 take precedence over group F 25 B 30/00. [5]

Compression machines, plant, or systems

Compression machines, plant or systems with non-reversible cycle (F 25 B 3/00, F 25 B 5/00, F 25 B 6/00, F 25 B 7/00, F 25 B 9/00 take precedence) [5]

with compressor of reciprocating-piston type (F 25 B 1/10 takes precedence)

with compressor of rotary type (F 25 B 1/10 takes precedence)

047

of screw type [5]

053

of turbine type [5]

with compressor of jet type, e.g. using liquid under pressure (F 25 B 1/10 takes precedence)

using vapour under pressure

with multi-stage compression (with cascade operation F 25 B 7/00)

Self-contained rotary compression machines, i.e. with compressor, condenser, and evaporator rotating as a single unit

Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity (with cascade operation F 25 B 7/00)

arranged in parallel [5]

arranged in series [5]

Compression machines, plant, or systems, with several condenser circuits [5]

arranged in parallel [5]

arranged in series [5]

Compression machines, plant, or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit (F 25 B 9/00 takes precedence)

Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point

using Joule-Thompson effect; using vortex effect

using vortex effect [5]

using expanders (F 25 B 9/10 takes precedence) [5]

using ejectors (F 25 B 9/10 takes precedence) [5]

with several cooling stages [5]

using ³He-⁴He dilution [5]

characterised by the cycle used, e.g. Stirling cycle [5]

11/

Compression machines, plant, or systems, using turbines, e.g. gas turbines

11/

as expanders (F 25 B 9/06 takes precedence) [5]

11/

centrifugal type [5]

13/

Compression machines, plant, or systems, with reversible cycle (defrosting cycles F 25 B 47/02)

Sorption machines, plant, or systems

15/

Sorption machines, plant, or systems, operating continuously, e.g. absorption type

15/

without inert gas (F 25 B 15/12, F 25 B 15/14, F 25 B 15/16 take precedence)

15/

the refrigerant being ammonia evaporated from aqueous solution

15/

the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide

15/

the refrigerant being sulfuric acid

15/

the refrigerant being hydrogen desorbed from a hydride [5]

15/

with inert gas (F 25 B 15/12, F 25 B 15/14, F 25 B 15/16 take precedence)

15/

with resorber (F 25 B 15/14 takes precedence)

15/

using osmosis

15/

using desorption cycle

17/

Sorption machines, plant, or systems, operating intermittently, e.g. absorption or adsorption type

17/

the absorbent or adsorbent being a liquid, e.g. brine (F 25 B 17/10 takes precedence)

17/

with two or more boilers operating alternately

17/

with the boiler and evaporator built-up as a unit in a tiltable or revolving arrangement

17/

the absorbent or adsorbent being a solid, e.g. salt (F 25 B 17/12 takes precedence) [5]

17/

using the endothermic solution of salt

17/

using desorption of hydrogen from a hydride [5]

Machines, plant, or systems, with a single mode of operation, not covered by groups F 25 B 1/00 to F 25 B 17/00

19/

Machines, plant, or systems, using evaporation of a refrigerant but without recovery of the vapour

19/

using fluid jet, e.g. of steam

19/

using liquid jet, e.g. of water

21/

Machines, plant, or systems, using electric or magnetic effects

21/

using Peltier effect; using Nernst-Ettinghausen effect (thermoelectric elements H 01 L 35/00, H 01 L 37/00)

21/

reversible [5]

23/

Machines, plant, or systems, with a single mode of operation not covered by groups F 25 B 1/00 to F 25 B 21/00, e.g. using selective radiation effect

25/

Machines, plant, or systems, using a combination of modes of operation covered by two or more of the groups F 25 B 1/00 to F 25 B 23/00 (combinations of two or more modes of operation covered by a single main group, see the relevant group)

25/

Compression-sorption machines, plants, or systems

27/

Machines, plant, or systems, using particular sources of energy (F 25 B 30/06 takes precedence)

27/

using waste heat, e.g. from internal-combustion engines

29/

Combined heating and refrigeration systems, e.g. operating alternately or simultaneously [5]

30/

Heat pumps [5]

30/

of the compression type [5]

30/

of the sorption type [5]

30/

characterised by the source of low potential heat [5]

Component parts or details

31/

Compressor arrangements (compressors per se F 04)

31/

of motor-compressor units

33/

Boilers; Analysers; Rectifiers (boiler-absorbers F 25 B 35/00)

35/

Boiler-absorbers, i.e. boilers usable for absorption or adsorption

35/

using a liquid as sorbent, e.g. brine

35/

using a solid as sorbent

37/

Absorbers; Adsorbers (boiler-absorbers F 25 B 35/00; separating processes involving the treatment of liquids with adsorbents B 01 D 15/00; separation of gases or vapours by adsorption B 01 D 53/02; separation of gases or vapours by absorption B 01 D 53/14; investigating using adsorption or absorption G 01 N 30/00)

39/

Evaporators; Condensers

39/

Evaporators

39/

Condensers

40/

Subcoolers, desuperheaters or superheaters [5]

40/

Subcoolers [5]

40/

Desuperheaters [5]

40/

Superheaters [5]

41/

Fluid-circulation arrangements, e.g. for transferring liquid from evaporator to boiler (pumps per se, sealings therefor F 04)

41/

using electro-osmosis

41/

Disposition of valves (valves per se F 16 K)

41/

Flow restrictors, e.g. capillary tubes; Disposition thereof

43/

Arrangements for separating or purifying gases or liquids (in analysers or rectifiers F 25 B 33/00); Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat (F 25 B 40/00 takes precedence) [5]

43/

for separating lubricants from the refrigerant

43/

for withdrawing non-condensible gases

45/

Arrangements for charging or discharging refrigerant

47/

Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass

47/

Defrosting cycles [5]

49/

Arrangement or mounting of control or safety devices (testing refrigerators G 01 M; control in general G 05)

49/

for compression type machines, plant or systems [5]

49/

for sorption type machines, plant or systems [5]