Cooperative Patent Classification


CPC Definition - Subclass F23N

Printable version [PDF]
Last Updated Version: 2017.05
REGULATING OR CONTROLLING COMBUSTION (control devices specially adapted for fluidised-bed combustion apparatus F23C 10/28; condition responsive controls for regulating combustion in domestic stoves with open fires for solid fuel F24B 1/187)
Definition statement

This place covers:

Means and methods for regulating or controlling combustion, including details of the accessories and components for carrying out said controls such as for example fuel valves, detectors, sensors, timers independently of the type of the fuel which is burned.

Safety controls.

Pneumatic, electronic, electrical or hydraulic circuits used for controlling or regulating combustion.

References
Limiting references

This place does not cover:

Control devices specially adapted for fluidised-bed combustion apparatus

Condition reponsive controls for regulating combustion in domestic stoves with open fires for solid fuel

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Control devices specially adapted for incinerators

Informative references

Attention is drawn to the following places, which may be of interest for search:

Control systems for gas turbine plants

Special rules of classification

In this subclass, the first place priority rule is applied, i.e. at each hierarchical level, classification is made in the first appropriate place.

When classifying in this subgroup, add the Indexing Codes F23N 1/00-F23N 2041/22 and F23N 2900/00-F23N 2900/05181 .

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Air

a mixture of gases containing free oxygen and able to promote or support combustion

Primary air

air supplied to the burning fuel in order to liberate combustible gases

Secondary air

air supplied to the combustible gases liberated by the primary air in order to complete their combustion. The term "secondary air" covers "tertiary air" etc.

Ash

means any solid combustion residues, for example remaining in the fuel bed or suspended in the flue gases

Burner

a device by which fluid fuel or solid fuel suspended in air is passed to a combustion space where it burns to produce a self-supporting flame

Combustion

means the direct combination of oxygen gas, e.g. in air, and a burnable substance

Combustion chamber

a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame

Combustion zone

the part of the apparatus where the reaction takes place between air and fuel

Flue gases

any gaseous products of combustion

Grate

a perforated surface, e.g. a grid, which supports or delimits a bed of burning fuel and serves to supply primary air

Firebridge

a low wall separating the fuel bed from adjacent flue gas passages in apparatus for combustion of solid fuel, for example in reverberatory furnaces or fire-tube boilers

Synonyms and Keywords

In patent documents, the following words/expressions are often used with the meaning indicated:

"boiler"

"combustion apparatus".

"burner"

"combustion apparatus".

Regulating fuel supply
Definition statement

This place covers:

Regulating fuel supply.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Regulating fuel supply conjointly with air supply and draft

Regulating fuel supply conjointly with draft

Regulating fuel supply conjointly with another medium, e.g. boiler water

Regulating fuel supply conjointly with another medium, e.g. boiler water, and air supply or draught

Regulating air supply or draught (conjointly with fuel supply F23N 1/00)
Definition statement

This place covers:

Regulating air supply or draught.

References
Limiting references

This place does not cover:

Regulating air supply conjointly with fuel supply

Informative references

Attention is drawn to the following places, which may be of interest for search:

Regulating draught by direct pressure operation of single valves or dampers

Regulating air supply or draught by operation of single valves or dampers by temperature sensitive elements

Regulating air supply or draught by conjoint operation of two or more valves or dampers

Regulating air supply or draught by power-assisted systems

by conjoint operation of two or more valves or dampers (F23N 3/08 takes precedence)
References
Limiting references

This place does not cover:

Regulating air supply or draught by power-assisted systems

Systems for controlling combustion (F23N 1/00, F23N 3/00 take precedence)
Definition statement

This place covers:

Systems for controlling combustion.

References
Limiting references

This place does not cover:

Regulating fuel supply

Regulating air supply or draught

Informative references

Attention is drawn to the following places, which may be of interest for search:

Controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium

Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using bimetallic elements

Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using bellows or diaphragms

Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using light-sensitive elements

Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using thermocouples

Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using ionisation-sensitive elements, i.e. flame rods

Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using thermo-sensitive resistors

Controlling combustion using detectors sensitive to rate of flow of air or fuel

Controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays

Controlling combustion with a time programme acting through mechanical means, e.g. using cams

Preventing development of abnormal or undesired conditions, i.e. safety arrangements

Details relating to combustion controls

Testing of other ignition means, e.g. flame

Analysing gases by investigating the ionisation by using heat