Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
  • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
  • F26B13/22—Arrangements of gas flames
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
  • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
  • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
  • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
  • F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
  • F26B13/183—Arrangements for heating, cooling, condensate removal
  • F26B13/186—Arrangements for heating, cooling, condensate removal using combustion

Definitions

• the present invention relates to a linear gas and blown air burner, comprising an air distributor tube connected to a pressurized air supply, a gas distributor tube mounted inside the air distributor tube and provided with '' a gas inlet connected to a pressurized gas supply, and at least one longitudinal row of gas injectors, these injectors extending substantially radially from the gas distributor tube through air injectors mounted on air outlet ports in the wall of the air distributor tube, each gas injector being mounted on a gas outlet port in the wall of the gas distributor tube.
• Such a linear gas burner described in European patent n ° 0190091, has great advantages from the point of view of safety, since the mixing of the gas with the blown air takes place only at the entrance to the combustion zone. , and from the point of view of operating convenience since it has a very high ratio between its maximum power and its minimum power. This is why it is very widely used, especially in the food industry and in the textile industry. This is the case in particular in textile finishing machines, especially the drying and heat setting reams, where it allows both an optimal distribution of heat over the entire surface of the product to be treated and a power modulation which will up to 1:50 and which allows, in applications as different as drying fabrics or heat-fixing dyes, to work at very precise temperatures whatever the heat requirement.
• the present invention therefore aims to provide a linear gas burner of the type indicated in the preamble, equipped with a device for precisely adjusting the active width of the flame, keeping it engaged or not, in a way individual, at least the injectors located near one end of the row.
• the burner according to the invention is characterized in that the gas distributor tube is closed internally by at least one sliding shutter member arranged to block the gas supply to a section of this tube comprising one or more several gas injectors, said shutter member being coupled to a control bar disposed longitudinally in this tube and connected to control means located outside this tube, and in that all the air injectors of said row continue to 'be supplied with air when the gas supply to one or more gas injectors is blocked by said shutter member.
• control bar is rotatable about its axis and comprises at least one threaded section which is engaged in a corresponding threaded bore of the shutter member, and the shutter member is provided with means preventing it from rotating in the gas distributor tube.
• the control bar can be rotatably mounted in two elements closing the ends of the gas distributor tube, the bar passing through at least one of the elements to be connected to the control means.
• the gas distributor tube has a circular cross section, as does the closure member, and to prevent the closure member from rotating in the tube, the control rod and the threaded bore of this organ are arranged following: an axis which is off-center by
• the gas distributor tube is equipped with two sliding shutter members and with a " lateral gas inlet situated between these two members.
• the control bar comprises two threaded elements in - if -
• control bar can be connected to the control means by means of a removable coupling.
• FIG. 1 is a diagrammatic side elevation view, partially cut away, of an embodiment of a gas burner according to the invention
• FIG. 2 is a schematic cross-sectional view of this burner, along the line II - II of FIG. 1,
• FIG. 3 is a view in longitudinal section, on line III-III of the figure, of the gas distributor tube of this burner and of the adjustment mechanism which it contains,
• FIG. 3 is a cross-sectional view along line IV - IV of FIG. 3, and
• Figure 5 is a view similar to the figure and shows another embodiment.
• the linear burner shown comprises an external air distributor tube 1, a gas distributor tube 2 mounted inside the tube 1 in an adjustable position thanks to a pair of threaded rods 3 screwed into the wall of the tube 2 and provided with locking nuts 4, and a row of gas injectors 5 fixed to the tube 2 perpendicular thereto and extending outward, each through an air injector 6 formed by a tubular opening fixed in an orifice 7 of the tube 1.
• Each air injector contains a swirl ring S, favoring the mixing of the gas and the combustion air at the outlet of the gas injector 5.
• This type of injector is well known and it is R90 / 00004
• each gas injector 5 is provided with a threaded base 9 which is screwed into a threaded bore 10 of the gas distributor tube 2.
• the injectors 5 and 6 are arranged in a row and all open into a combustion zone 1 1 defined by a flame guide 12 made of refractory steel, which is fixed externally to the tube 1 by bolting in slides (not shown), they -same bolted to the tube 1.
• the flame guide 12 carries an electric igniter 16 and a flame control device 17, for example by detection of ultraviolet radiation.
• the arrangements mentioned above are well known in the field of gas and supply air burners.
• the gas distributor tube 2 is a straight cylindrical tube, having a longitudinal axis 20 disposed approximately, but not necessarily, in the center of the tube
• the tube 2 is provided with a lateral gas inlet nozzle 21 connected to a supply pipe 22 which passes through the wall of the tube 1 and which supplies the burner with gas from, as l 'indicates arrow G, of an adjustment valve not shown.
• This valve allows to regulate the gas flow, therefore the power of the burner.
• the gas may for example be natural gas, liquefied petroleum gas or a manufactured gas such as town or blast furnace gas.
• An end 2k of the air distributor tube 1 is connected to an air supply pipe 25, by a flange assembly 26 equipped with a diaphragm 26a controlling the air flow, which is blown at - low pressure and arrives as indicated by arrow A, then passes around the gas distributor tube 2 to reach the air injectors 6 which mix it with the gas at the entrance to the combustion zone 1 1.
• the other end 27 of the tube 1 is closed by a cover 2S fixed on a flange 29 of the tube and traversed by a control shaft 30 provided with a manual flywheel 31 or an automatic control.
• the gas distributor tube 2 is shown in more detail in FIGS. 3 and 4. It is a straight cylindrical steel tube, supported by the threaded rods 3 and carrying the gas injectors 5. For simplicity, there is n 'has shown that five gas injectors 5a to 5e.
• Each end of the tube 2 is closed by a plate 32, 33 fixed by means of a threaded cap 34, 35 screwed externally to the tube 2.
• Two closure nuts 36, 37 are slidably mounted in the inner bore of the tube 2 and each of them closes this bore in a sealed manner between the corresponding end of the tube and the gas inlet nozzle 21.
• Each of these nuts can be formed for example by a cylindrical piece of bronze pierced with an eccentric longitudinal bore provided with a thread 38, 39 and centered on an axis 40 which is offset by a distance E with respect to l 'axis 20 of the tube 2 and the outer surface of the nut. In this example, this offset E is lateral, but it could be provided in another direction.
• a rotary bar 41 also centered on the axis 40, extends longitudinally in the tube 2 and is carried by cable gland bearings 42, 43 mounted in the plates 32 and 33.
• One end 44 of the bar 41 crosses the cap 35 and is connected to the control shaft 30 by means of a suitable coupling 45 (FIG. 1), for example a fork coupling.
• a suitable coupling 45 for example a fork coupling.
• the rotary bar 41 is subdivided into two symmetrical elements 48 and 49 which are made integral in rotation by a coupling sleeve 50 and elastic pins 51, approximately in the middle of the length of the tube 2.
• each element 48, 49 has a cylindrical section 52, 53 rotatably supported by a respective spacer 54, 55 fixed in the tube 2 by * screws 56.
• the element 48, 49 is retained longitudinally by an elastic ring of the "circlip" type 57.
• each spacer 54, 55 is pierced with several holes 60, 61 for the passage of gas along the tube 2. - 7 -
• the flame will widen if the 'the handwheel 31 and the bar 41 are turned in the opposite direction.
• provision can be made to adjust the gas supply flow at the same time. This adjustment can be done automatically using a pressure sensor on the supply line 22. In another embodiment, it can be controlled by a motorized control of the flame width adjustment mechanism, actuating the rotary bar 41. During this time, the air continues to be supplied to the combustion zone 11 by all the injectors 6, even where the injectors 5 no longer receive gas. In a drying drum as mentioned above, this has the advantage of helping to cool the end regions of the drum.
• the present invention is not limited to the embodiment described above by way of example, but it extends to any modifications or variants obvious to a person skilled in the art.
• the eccentric arrangement of the bar 41 is not essential, as shown in FIG. 5.
• the nuts 36, 37 are replaced - by nuts 66, 67 having a threaded bore centered on the axis 20 of the tube
• each nut is provided with a lateral groove 68 which slides on a corresponding longitudinal key 69, fixed in the tube 2 by screws 70 and extending over the entire length of the stroke. the nut.
• This arrangement makes it possible to dispense with the spacers 5, 55 of the previous example and to use a bar 41 in one piece.
• the eccentric arrangement has the advantage of facilitate sealing and manufacturing.
• each nut 36, 37 or 66, 67 could also be designed in two elements, one of which provides sealing and the other serves as the nut proper on the thread of the bar 41.
• shutter members constituted by the nuts 36, 37 could be replaced by members controlled in a different manner, for example by means of sliding rods controlled from the outside of the burner by a linear actuator.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Textile Engineering (AREA)
• Gas Burners (AREA)
• Pre-Mixing And Non-Premixing Gas Burner (AREA)
• Glass Melting And Manufacturing (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9377602

Family Applications (1)

Country Status (8)

Cited By (2)

Families Citing this family (8)

Citations (2)

Family Cites Families (5)

• 1989
  • 1989-01-06 FR FR8900240A patent/FR2641601A1/fr active Granted
• 1990
  • 1990-01-04 EP EP90901598A patent/EP0452379B1/fr not_active Expired - Lifetime
  • 1990-01-04 WO PCT/FR1990/000004 patent/WO1990007680A1/fr not_active Ceased
  • 1990-01-04 CA CA002045521A patent/CA2045521A1/fr not_active Abandoned
  • 1990-01-04 DE DE69014858T patent/DE69014858T2/de not_active Expired - Fee Related
  • 1990-01-04 US US07/721,463 patent/US5152685A/en not_active Expired - Fee Related
  • 1990-01-04 JP JP2501764A patent/JPH04502664A/ja active Pending
  • 1990-01-04 AT AT90901598T patent/ATE115262T1/de not_active IP Right Cessation

Patent Citations (2)

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