EP3460324A1 - Dispositif de mélange pour un appareil de chauffage et appareil de chauffage doté d'un tel dispositif de mélange - Google Patents

Dispositif de mélange pour un appareil de chauffage et appareil de chauffage doté d'un tel dispositif de mélange Download PDF

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Publication number
EP3460324A1
EP3460324A1 EP18189107.8A EP18189107A EP3460324A1 EP 3460324 A1 EP3460324 A1 EP 3460324A1 EP 18189107 A EP18189107 A EP 18189107A EP 3460324 A1 EP3460324 A1 EP 3460324A1
Authority
EP
European Patent Office
Prior art keywords
openings
mixing device
combustion air
fuel
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18189107.8A
Other languages
German (de)
English (en)
Inventor
Alvaro Carlos Catalan Barriuso
Franz Schmuker
Albrecht Schaefer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3460324A1 publication Critical patent/EP3460324A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/02—Construction of valves or dampers for controlling air supply or draught pivoted about a single axis but having not other movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/06—Construction of valves or dampers for controlling air supply or draught slidable only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2400/00—Pretreatment and supply of gaseous fuel
    • F23K2400/20—Supply line arrangements
    • F23K2400/201—Control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05002—Valves for gaseous fuel supply lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/08—Household apparatus

Definitions

  • the invention relates to a mixing device for heaters with a combustion air supply, a fuel supply and with a housing having at least two inputs, at least one output and at least one mixing region, are fed into the combustion air and fuel through adjustable openings.
  • the invention also relates to heaters with such a mixing device.
  • the mixing device according to the invention according to the independent claims has the advantage that a very large modulation range can be achieved without having to resort to complex, vulnerable technologies.
  • the adjustable openings are realized by means of dynamic pressure diaphragms, in which the air conditions can be controlled easily and safely.
  • the entire combustion air and the combustion air mixed fuel are passed through the adjustable openings and ensures a predetermined mixing ratio over the high modulation range.
  • the adjustment of the openings is effected by the fan itself in a simple manner, in particular, the negative pressure generated by the fan is utilized.
  • a modulation range is understood to mean a power range within which a heater can be operated. In modern homes or houses often a small power in the range of 1, 5 to 2.5 kW for heating while sufficient for the provision of hot tap water, the heater is to be used in a power range of 20 to 30 kW. A power range from 2 kW to 20 kW would thus correspond to a modulation of 1 to 10, while a power range from 1.5 kW to 30 kW would be a modulation range of 1 to 20.
  • the mixing ratio is optimally adjusted when the openings, in particular the openings for the combustion air and the fuel, are synchronously adjustable.
  • the fan can be designed smaller in its performance, because thereby the flow resistance at high power of the heater is lower and thus the power requirement of the Fan.
  • the opening cross section of the opening or the openings for the combustion air in total 10 to 20 times greater than the opening or the openings for the fuel. It has been found that in this range of values excellent settings for the respective heater can be found. An improvement can be seen if the value range is between 13 and 17.
  • the setting can also be optimally found for different types of gas. Regardless of the type of gas, an optimal point is made when the value range is set to 15. The gas type is then set in a small delta around the value 15.
  • openings are at least substantially rectangular. Such openings are easy to control both in the production and in the design and calculation of the adjustment.
  • the openings are divided into several segments.
  • the opening for the combustion air consists of several individual openings.
  • the opening for the fuel can be composed of the sum of several individual openings.
  • a particularly simple adjustment of the openings succeeds if the openings have a length and a width and are varied over the length.
  • An adjustment to different types of gas can be done by contrast, for example, by a variation of the width.
  • a particularly simple adjustment succeeds if one or more slides are provided.
  • a particularly simple structure is obtained when the adjustment is effected by at least one at least substantially cylindrical hollow body.
  • the combustion air and the fuel can be supplied from the outside and the mixing begins inside the hollow body.
  • At least one of the openings and / or an additional opening for the combustion air can be temperature-dependent adjustable.
  • a particularly simple structure is obtained when an adjustment device is provided which is able to act on one, several or all of the openings.
  • the invention also relates to a heater in which the combustion air and the fuel can be supplied through variable openings of a mixing chamber and the openings are larger at high powers than at low powers, wherein the mixing device is designed according to one of the aforementioned embodiments.
  • FIG. 1 a schematic representation of a heater
  • FIG. 2 a cut part of a mixing device according to the invention
  • FIG. 3 a view after III in FIG. 2
  • FIG. 4 a variation of the mixing device according to the FIG. 3
  • the FIG. 5 a part of a heater with a alternative mixing device
  • the FIG. 6 a detached part FIG. 5
  • the FIG. 7 a section according to VII-VII in FIG. 6
  • FIG. 1 a schematic representation of a heater
  • FIG. 2 a cut part of a mixing device according to the invention
  • FIG. 3 a view after III in FIG. 2
  • FIG. 4 a variation of the mixing device according to the FIG. 3
  • the FIG. 5 a part of a heater with a alternative mixing device
  • the FIG. 6 a detached part FIG. 5
  • the FIG. 7 a section according to VII-VII in FIG. 6
  • the FIG. 1 a schematic representation of a heater
  • FIG. 2 a cut part of a mixing device
  • FIGS. 9 and 10 possible embodiments for a setting device for the mixing device.
  • FIG. 1 schematically a heater 10 is shown with a combustion chamber 12, at the top of a burner 14 and, in contrast, below a heat exchanger 16 are arranged.
  • a combustion chamber 12 In the combustion chamber 12 further protrude two electrodes 18, which are used for ignition and flame monitoring and which are connected to a control electronics 20.
  • the heater 10 has a mixing device 22.
  • the mixing device 22 comprises a housing 23, into which a first and a second inlet 24 and 26 and an outlet 28 open.
  • a combustion air supply 30 and to the second input, a fuel supply 32 is connected.
  • the combustion air supply 30 which is formed by a small intake manifold, ambient air can get into the mixing device 22.
  • the fuel supply 32 which in turn is connected to a valve 34, the fuel, gas in the embodiment, is supplied.
  • the valve 34 is in the embodiment of a pneumatic valve, which reduces the gas pressure to the ambient pressure. In the mixing device thus the combustion air and the fuel are provided under the same pressure. In another embodiment, the valve 34 may also be an electrically actuated valve, which is then controlled or regulated by the control electronics 20.
  • the output 28 is connected to the negative pressure side of a blower 36 whose output side leads to a mixing chamber 38.
  • the mixing chamber 38 is in turn connected to the burner 14 and provides this the fuel-air mixture available. After the mixture has been burned and the combustion chamber 12 has flowed through, it passes to an exhaust gas collector 40, via which the exhaust gas is discharged.
  • a line 44 which leads to a so-called vacuum box 46 and there is connected to a vacuum chamber 48.
  • the vacuum chamber 48 is separated by a membrane 50 from a chamber 52 which is connected via an opening 54 with the environment.
  • an actuator 56 is attached, whose stroke corresponds to the movement of the membrane 50.
  • the dotted line 58 indicates that the actuator 56 can act on parts of the mixing device 22.
  • a mixing device 22 may look like is in the Figures 2 and 3 shown.
  • the housing 23 is shown cut open. It can be seen that the fuel supply 32 penetrates from above into the housing 23 and extends further inside the housing 23 at a right angle 60 along the housing 23.
  • the combustion air represented by arrows 62, passes through the first input 24 into the housing 23.
  • the fuel is directed through an opening 64 which restricts the flow area to a predefined extent.
  • the combustion air is guided in this embodiment through two openings 66, which also limit the flow cross-section to a predefined level.
  • openings 64 and 66 at which the gases flowing through are jammed, are also called ram pressure diaphragms.
  • venturi nozzles which try to minimize pressure and energy loss
  • defined intake conditions in the mixing area 67 are created directly downstream of the dynamic pressure diaphragms.
  • this has the disadvantage that four times the fan power must be provided for the required double flow rates.
  • variable openings 64, 66 as dynamic pressure apertures.
  • the result is the combinatorial effect that on the one hand finds the pressure and flow conditions defined in the mixing region 67 for the apertures 64, 66 on the other hand by the variation of the openings 64, 66 on the performance requirements of the sucking blower 36 directly influence.
  • the variation of the openings 64, 66 performed by means of a slider 68.
  • the slider 68 sits in a slot 70 and can be moved along the openings 64, 66 so as to cover or release parts of the openings 64, 66.
  • the fuel opening 64 and the combustion air openings 66 are synchronously varied.
  • the slide 68 moves equally across the openings 64 and 68 and thus varies proportionally to the same extent.
  • the rod 72 is driven by a motor actuator 73, as in the FIG. 3 indicated by dash-dotted lines.
  • the actuator 73 may be designed as a stepper motor and is driven by the control electronics 20.
  • the orifices 64 and 66 are increased over a small power in a large power of the heater 10, that is, when the blower 36 operates in a high power range.
  • FIG. 4 is the mixing device 22 analogous to the mixing device 22 after FIG. 3 shown, in which case an additional adjustment means 74 is provided, with which the opening 64 for the fuel can be additionally varied.
  • the adjusting device 74 has a transverse slide 76 which is movable perpendicular to the slide 68.
  • the cross slide 76 cooperates with a screw 78, by the rotation of the cross slide 76 can be changed in position.
  • the opening width of the opening 64 is thereby varied and can be adjusted to different types of gas. For gas types with a low energy content, the cross slide 76 is moved so that the opening 64 is larger than for gas types with a higher energy content.
  • the sum of the opening cross sections of the combustion air openings 66 is about 15 times larger than the opening area for the opening 64 for the fuel. This setting is intended for the normally used gas type and only changed when the gas type changes.
  • the opening cross-section of the openings 66 in total 13 to 17 times greater than the opening cross-section for the opening 64 of fuel.
  • the fuel opening 64 is provided as a single opening, a plurality of segments in the form of openings 66 are provided for the combustion air.
  • the segments are of identical size and shape in the embodiments, but this is not mandatory.
  • the openings 64, 66 are rectangular in shape and have a length and a width.
  • the variation of the openings is made by increasing or decreasing the length of all openings 64, 66.
  • the adjustment to the gas type is made by increasing or decreasing the width of the opening 64 for the fuel.
  • FIG. 5 another embodiment is shown. It is an internal complex of a heater 10 recognizable with a valve 34 which is connected via a line for the fuel supply 32 with a mixing device 22. This is then further connected via the output 28 to the blower 36 and further to the mixing chamber 38. Furthermore, the outer connection of the electrodes 18 can still be seen, as well as the exhaust gas collector 40 and a flue gas outlet 80 connected thereto.
  • the mixing device 22 is in this embodiment of a rather round, cylindrical shape and more clearly in the FIGS. 6 and 7 shown.
  • the housing 23 of the mixing device 22 has, as in FIG. 7 can be seen in section, a roughly round, cup-shaped shape with an outer wall 82 and a bottom 84 which in the FIGS. 6 and 7 However, it is not recognizable.
  • the outer wall 82 is on the ground 84 opposite side of a circumferential collar 86 which receives the output 28 or forms.
  • a collecting box 88 On the outer wall 82 of the mixing device 22 sits a collecting box 88, which collects the fuel to be discharged from the mixing device 22 combustion-combustion mixture and the blower 36 supplies.
  • the collecting box 88 has a fan receptacle 90 into which the fan 36 can be inserted.
  • the adjustable openings 66 are recessed. They are rectangular in shape with a length L and a width B, the length L extending along the axial extent of the outer wall 82 and the width B along the circumference of the outer wall 82 (see also Figs FIG. 8 ).
  • cup 90 Within the outer wall 23, a cylindrical hollow body 89, hereinafter called cup 90, is arranged.
  • the cup 90 has a cup wall 92 extending inside and along the outer wall 82 and a cup bottom 94 disposed parallel to the bottom 84.
  • the interior of the cup 90 forms the mixing area 67.
  • axis 96 which penetrates the cup bottom 94 and, together with the outer wall 82, constitutes a guide for a movement of the cup 90.
  • axis 96 of the cup 90 and the outer wall 82 are arranged concentrically.
  • openings 98 of rectangular shape are introduced.
  • the openings 98 correspond to the openings 66 in the circumferential direction, overlap in the illustrated rest state in the axial direction, however, only to a certain degree.
  • the blower 36 draws via the collecting box 88 and the mixing device 22 through the openings 98 and 66 combustion air from the environment of the mixing device 22.
  • fuel through the fuel supply 32 and the second input 26 by in the FIGS. 6 and 7 not to be seen opening 64 also sucked. In this way, an operation of the heater can take place.
  • the blower power is increased, ie its speed increased, and the negative pressure in the collecting box 88 and in the mixing device 22 is increased.
  • the increase in the negative pressure now causes the cup 90 against its own weight along the axis 96 in the FIG. 7 is lifted to the top. This increases the coverage of the openings 98 with the openings 66 and the effective opening cross section is larger.
  • the cup 90 thus acts analogous to the slider 68 in the previous embodiments.
  • the mixing device 22 is not mounted horizontally in this vertical orientation but instead of the weight force, an additional force is provided, for example via one or more springs.
  • an adjustment device 100 corresponding to the adjustment device 74 is provided in the area of the fuel supply 32.
  • the adjustment device 100 has a cross slide 102, which can change the opening width of the opening 64.
  • the cross slide 102 is connected to a screw mechanism 104, via which the position of the cross slide 102 is adjustable.
  • the screw mechanism is loaded by a spring 106, acts via a guide 108 on the cross slide 102, which in turn for accurate positioning has a on a projection 110 of the outer wall 82 supporting rod guide 112.
  • FIG. 8 schematically a variant of the mixing device 22 is shown in a view from the interior of the cup 90.
  • the cup wall 92 with its openings 98 and the bottom 94 and the bottom 84 of the housing 23.
  • the cup wall 92 covers the openings 64 and 66 upwards.
  • the cup wall 92 is removed along the line 114.
  • both the openings 64 and 66 and the openings 98 are of rectangular shape and partially overlap along their longitudinal extent. Where the openings cover 64, 66 and 98 can flow through combustion air respectively fuel.
  • the fan power is increased, the negative pressure in the mixing device 92 increases and the cup moves along the arrow 116 upwards. As a result, the coverage of the openings 64, 66 and 98 is increased, whereby the flow cross-section is increased. As a result, the performance of the blower 36 need not be increased to the extent that would be the case with fixed flow cross-sections to achieve a desired heater 10 performance. If the fan power is reduced, the lowers Cup 90 against the arrow direction of the arrow 116 and the resulting flow cross-section is reduced again.
  • a slot 120 is inserted in the cup wall 92, in which a cam 122 engages.
  • the slot 120 extends in the axial direction and is arranged so that the cup 90 can perform its axial movement.
  • the cam 122 acts as a guide and as anti-rotation of the cup 90 relative to the outer wall 82nd
  • the cam 122 is arranged eccentrically on a stub shaft 124.
  • This stub shaft 124 is in turn rotatably inserted in the outer wall 82, as in the detail of Figure 8A can be seen.
  • the stub shaft 124 is supported by a head 126, which abuts against the outside of the outer wall 82 and is fixed by a holding device 128.
  • the openings 98 and 66 completely overlap in width and only partially in length.
  • the width of the openings 66 is greater than the width of the openings 98.
  • the openings 98 and 64 overlap in length analogous to the other openings, but are offset in width to each other. If now the adjusting device 118 is rotated, the cup 90 moves relative to the outer wall 82 in the circumferential direction, so that the coverage in the width of the openings 98 and 64 varies. In this way, a larger or smaller flow area 130 can be achieved and reacted to gas types with lower or higher energy content.
  • the width ratios for the openings for the combustion air are chosen so that the coverage remains the same despite the lateral displacement.
  • the adjustment range 131 is given by the eccentricity of the cam 122.
  • the head 126 may include a slot 133 through which adjustment may be made. However, it is also possible to act on the adjusting motor.
  • openings 64 and / or 66 and / or 98 are shown. Each individual openings may have such shapes or all.
  • FIG. 8B For example, a bulbous shape is seen which causes the increase in flow area 130 to be disproportionate in a mid-range performance.
  • FIG. 8C is a trapezoidal shape recognizable, which causes the increase in the flow cross-section of disproportionately small to large power.
  • FIG. 8B For example, a bulbous shape is seen which causes the increase in flow area 130 to be disproportionate in a mid-range performance.
  • FIG. 8C is a trapezoidal shape recognizable, which causes the increase in the flow cross-section of disproportionately small to large power.
  • other forms are also conceivable, each adapted to the conditions on site.
  • FIG. 9 shows an alternative adjustment 132 for the illustrated in the form of a vacuum box 46 adjusting 132 of FIG. 1 , which is based on the same principle but arranged elsewhere.
  • the adjusting device 132 is in FIG. 9 disposed directly below the mixing device 22 and acts with the actuator 56 through the bottom 84 directly to the cup bottom 94th
  • the cup bottom 94 is in the region of the bottom 84 and the coverage of the openings 64, 66 and 98 are approximately as in FIG FIG. 8 indicated.
  • the negative pressure in front of the blower and thus in the region of the outlet 28 of the mixing device 22 increases.
  • this negative pressure region is connected to the vacuum chamber 48 of the adjusting device 132.
  • the vacuum chamber 48 is bounded on one side by the membrane 50, while on the other side of a chamber 52 is arranged, which is due to the openings 54 at atmospheric pressure. If the negative pressure in the vacuum chamber 48 rises - that is, the pressure drops relative to the atmospheric pressure - the diaphragm moves in the vacuum chamber FIG. 9 upward and pushes over the actuator 56, the bottom 94 and thus the cup 90 upwards. This increases the effective opening cross-section.
  • a higher force for adjusting the cup 92 can be generated with the same negative pressure.
  • a spring 134 is provided which holds the membrane 50 in a certain position or counteracts the force component generated by the negative pressure.
  • the conduit 44 could also be realized in the form of a channel in the actuator 56.
  • FIG. 10 Another embodiment is in the FIG. 10 shown.
  • the adjusting device 132 is arranged directly on the mixing device 22.
  • the bottom 94 of the cup 90 is part of the membrane 50 and the bottom 84 bounds the chamber 52 below the membrane.
  • flow channels 136 In the area of the outer wall 82 and the cup wall 92 are flow channels 136 provided that take over the function of the line 44. About them, the negative pressure region in the region of the output 28 is connected to the vacuum chamber 48.
  • the cup 90 is also in a basic setting and with increasing fan power due to the self-adjusting negative pressure in the vacuum chamber 48 in FIG. 10 moved upwards. Again, the force acting on the cup 90 is greater because a larger area is created by the membrane 50, to which the pressure difference between negative pressure and atmospheric pressure acts.
  • FIG. 10 It can be seen that a filter 138 is arranged in the region of the openings 54. This makes it possible to dispense with an elastic membrane which separates the negative pressure area from the atmospheric area. The resulting due to these missing seals leakage currents are negligible for the entire control strategy.
  • the mixing device 22 ensures that the stoichiometric settings over the entire control range or power range can be maintained. Temperature differences between the combustion air and the fuel, however, lead to density fluctuations and thus influence the stoichiometric settings. To counter this, a compensation device 140 may be provided, as in FIG. 1 is shown schematically.
  • the compensation device 140 consists of a bimetal spring 142, which acts on an opening 144 in the intake region of the blower 36, which is thus arranged in the vacuum region 42.
  • the bimetallic spring 142 is slightly open and there is a small supply air flow through the opening 144. Since the combustion air has more mass relative to the fuel, its temperature in the region of the compensation device 14 makes more noticeable than the temperature of the fuel. If the combustion air cools noticeably, the bimetallic spring will more and more cover the opening 144 and eventually close it completely. If, on the other hand, the combustion air heats up because, for example, it is heated more strongly during intake at high exhaust gas temperatures, the bimetallic spring opens access to the opening 144. The lower density can be compensated in this way.
  • the mixing device 22 it should be noted that it is possible with the mixing device 22 according to the invention, the stoichiometric composition for an environmentally conscious operation of Heater 10 over a wide power range and thus to comply with a large modulation range and still get along with energy-efficient blowers. This is achieved by using ram pressure diaphragms in the intake region, and / or that the entire combustion air and the entire fuel are guided through the adjustable openings 64 and 66 and / or that the adjustment of the openings 64 and 66 is effected by the blower.
  • variable orifice is to be understood as still providing temperature compensation, as provided by the adjuster 140, or leakage currents can occur without departing from the scope of the invention.
  • adjustable or varying openings 64 and 66 means openings which can be completely or partially covered by gate valves or other measures and thus the variation or adjustability is achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
EP18189107.8A 2017-09-25 2018-08-15 Dispositif de mélange pour un appareil de chauffage et appareil de chauffage doté d'un tel dispositif de mélange Withdrawn EP3460324A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017216961.3A DE102017216961A1 (de) 2017-09-25 2017-09-25 Mischeinrichtung für Heizgeräte sowie Heizgeräte mit einer solchen Mischeinrichtung

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EP3460324A1 true EP3460324A1 (fr) 2019-03-27

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EP18189107.8A Withdrawn EP3460324A1 (fr) 2017-09-25 2018-08-15 Dispositif de mélange pour un appareil de chauffage et appareil de chauffage doté d'un tel dispositif de mélange

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3540311B1 (fr) * 2018-03-13 2022-05-18 Bertelli & Partners S.r.l. Dispositif de régulation d'un mélange combustible-oxydant pour le prémélange de brûleurs à gaz

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EP2623863A2 (fr) * 2012-01-31 2013-08-07 Vaillant GmbH Dispositif de mélange air-gaz combustible
US20160069563A1 (en) * 2014-03-19 2016-03-10 Yahtec Device for burning pre-mixed gas
WO2018029074A1 (fr) * 2016-08-09 2018-02-15 Vergne Innovation Dispositif automatique de pre melange gaz combustible / gaz comburant, notamment pour chaudiere a gaz, installation integrant ce dispositif

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