JP2014534406A - Device for adjusting the gas mixture - Google Patents

Abstract

The present invention relates to a device (1) for adjusting an air-fuel mixture. The device leads to: a first inlet (21) for a first gas, a second inlet (22) for a second gas and an outlet (20) for an air-fuel mixture A mixing housing (10) having a mixing chamber (11); a first valve (31) configured to regulate the flow rate of the first gas through the first inlet, and a second inlet A second valve (32), configured to regulate the flow rate of the second gas through the. The first and second valves are rigidly connected to each other by a connecting member (40) so as to jointly adjust the flow rates of the first and second gases, the first and second valves and the first and second valves The second inlet is shaped and dimensioned such that a joint adjustment of the flow rates of the first and second gases automatically adjusts the mixture to the desired ratio.

Description

  The present invention relates to the field of devices for regulating an air / fuel mixture.

  The present invention more particularly relates to an apparatus as implemented in a boiler all air / gas premixed burner injection block.

  Home boilers must be able to meet the thermal requirements of the residence. These requirements include residential heating and sanitary hot water production, and these requirements currently assume very different operating power ranges.

  More specifically, high operating power is required, for example between 20 kW and 30 kW, for sanitary hot water production, while for heating it is limited, for example, between 0.5 kW and 4 kW. Output could be sufficient. This is at least an increasingly stringent heat regulation, and in particular relates to new standards relating to construction work and aiming to reduce residential energy consumption.

Currently, regulated home boilers with a total air / gas premix burner 7 as shown in FIGS. 1, 2 and 9 are known to the person skilled in the art and have a control device 8 and an air / gas mixture 9. The control device 8 has an air / gas ratio valve and the air / gas mixture 9 is determined in such a way that the amount of gas supplied to the burner 7 is always proportional to the combustion air supplied to the burner 7. The gas pressure is adjusted in proportion to the air pressure generated by the fan 6. Boilers equipped with such devices:
Allow output adjustment only in a limited output range, e.g. only in the output range with the highest and lowest limits whose ratio does not exceed a value equal to 10;
-In low power modes, eg less than 2 kW, do not allow satisfactory power regulation, ensuring particularly good clean combustion.

  In addition, when the set point corresponds to an operating output that is lower than the minimum value allowed by the injection block, currently household boilers respond to alternating low-power operating points and end points whose average value is the set point. The sequential operation is adopted. This sequential operation is unsatisfactory because it results in an increased number of times the burner is switched on and off, which is a source of contamination and failure, as well as a decrease in overall efficiency.

  In this context, the present invention proposes an apparatus for adjusting the air / fuel mixture that makes it possible to mitigate one or more of the above-mentioned drawbacks.

For this, the device for adjusting the mixture is basically:
A mixing housing having a mixing chamber leading to at least a first inlet for the first gas, a second inlet for the second gas and an outlet for the mixture;
A first valve configured to regulate or stop the flow rate of the first gas through the first inlet, and the configuration configured to regulate or stop the flow rate of the second gas through the second inlet. A second valve,
The first and second valves are firmly connected to each other by a link member so as to jointly adjust or stop the flow rates of the first and second gases, and the first and second valves and the first and second valves are connected to each other. The inlets are shaped and dimensioned such that a joint adjustment of the flow rates of the first and second gases automatically adjusts the mixture to the desired ratio.

  The present invention thus advantageously allows the adjustment of the air / fuel mixture by the joint adjustment of the flow rates of the first and second gases.

  According to a particular feature, the device is also for driving the operation of the first or second valve via a plurality of intermediate open positions between the inlet closed position and the inlet maximum opened position. The movement of the valve having means and associated with the drive means is proportional to the other valves so as to adjust the flow rate of the first and second gases to the mixing chamber and thus to the outlet of the mixture. Including exercise.

  The apparatus therefore advantageously allows adjustment of the mixture flow rate by joint adjustment of the flow rates of the first and second gases.

  According to another particular feature, the shape and dimensions of the first and second valves and the first and second inlets are such that the first and second gas flows through the first and second inlets, respectively. Adjusting and / or changing the bore cross-section for adjusting the flow rates of the first and second gases.

  The device thus advantageously allows to adjust and / or change the flow rates of the first and second gases.

  According to another particular feature, the mixing housing also has a first intake chamber for the first gas and a second intake chamber for the second gas, the first and second intake chambers. Each of the chambers communicates with the mixing chamber through at least the first and second inlets, respectively.

  According to another particular feature, the first inlet and the second inlet are centered about the exact same axis, and the link member is disposed within the mixing housing and is centered on the axis. The first rod is placed and the first and second valves are rigidly secured to each end of the first rod.

  The device thus advantageously allows a simple, mechanical and robust construction of the link member in the axial direction.

  According to another particular feature, the drive means comprises a second rod centered on the shaft and a linear actuator arranged on the shaft with respect to the outer wall of the housing, the first valve or the second The valve is rigidly fixed to the end of the second rod and the actuator engages the other end of the second rod through the outer wall of the housing, and the linear actuator translates exactly the same along the axis. The valve is driven by movement.

  The device thus advantageously allows a simple, mechanical and robust arrangement of the drive means in the axial direction, which drive means is also optionally coaxial with the structure of the link member.

  According to another particular feature, the outlet is centered on the shaft and the first inlet chamber is arranged such that the first inlet is placed facing the outlet and is close to the outlet. One intake chamber extends inside the mixing chamber until it intersects the axis beside a first wall having a first inlet and a second wall having a through orifice, the through orifice being centered on the axis. As it is pulled, the first rod is free to translate through it.

  The device thus advantageously allows an immediate and total release of the first gas mixed with the second gas.

  According to a first variant, the mixing chamber also leads to a third inlet for the first gas and to a fourth inlet for the second gas, the device also A third valve configured to regulate or stop the flow rate of the first gas through the intake port and a fourth valve configured to adjust or stop the flow rate of the second gas through the fourth intake port The third and fourth valves are fixed so as to adjust or stop the flow rates of the first and second gases passing through the third and fourth intake ports, respectively.

  According to the second variant, at least one of the two ends of the first rod is threaded and, complementarily, at least one of the first and second valves is threaded. Therefore, the distance between the first and second valves that are firmly fixed to each end of the first rod can be set precisely.

  According to these two variants, the device accurately sets the mixture ratio without requiring high precision machining of the first and second valves and the first and second inlets. Can advantageously be made possible.

  According to another particular feature, the first and second valves and the first rod are made of one or more parts that are rotationally symmetric or even symmetric with respect to a common point.

  According to another particular feature, the second inlet has a diameter or end that is between twice and ten times the diameter or end of the first inlet and the valve is in the shape of a rotating cone or pyramid, respectively. It is.

  The device thus advantageously allows the mixture to be adjusted and / or changed between a small amount of the first gas and a larger amount of the second gas.

  According to another particular feature, the linear actuator is a stepping motor.

  The device thus advantageously allows a precise control of the translational movement of the valve and the speed of this movement.

  According to another particular feature, the stepping motor operates at a variable speed according to the instantaneous position of the first and second valves.

  The device therefore advantageously allows translational movement of the variable speed valve.

  According to another particular feature, the first gas is a fuel and the second gas is an oxidant.

The present invention also relates to a boiler having a device for adjusting the air-fuel mixture as described above, wherein the first gas is a fuel and the second gas is an oxidant, the boiler is also:
-A fan configured to exhaust the mixture from the mixing chamber;
A total air / gas premix burner arranged downstream of the fan for burning the mixture, and a gas / air ratio control device arranged upstream of the first inlet for at least the first gas Have
This apparatus proportionals the gas pressure to the air pressure generated by the fan in such a way that the amount of gas supplied to the burner has a corresponding proportionally determined amount of combustion air supplied to the burner. Adjust.

The boiler therefore
-Adjusting the flow rate of the fuel gas and the flow rate of the oxidant gas; and / or-over the entire operating power range and in particular for lower operating power, for example lower than 6 kW, even lower than 3 kW Adjusting the gas and air to be stably mixed in terms of flow rate and / or composition, and / or-over a limited power range, for example in the range of 0.5 kW to 30 kW, or 2 of maximum power Advantageously enabling power adjustment to a minimum power showing less than% and / or-enabling power adjustment at low power, e.g. lower than 6 kW, even lower than 3 kW .

  Furthermore, a boiler having a device for adjusting the air-fuel mixture makes it possible to eliminate the need for sequential operation through the ability to respond to the lowest adjustment set point, thus eliminating sources of contamination and failure and overall It makes it possible to avoid any deterioration in efficiency.

  According to another particular feature, the fan operates at a fixed or variable speed according to the adjustment range so as to discharge a correspondingly variable amount of air-fuel mixture.

  The boiler thus advantageously allows another degree of freedom which makes it possible to adjust the flow rate of the exhaust gas mixture.

  According to the first embodiment of the boiler, the fan is an extraction fan arranged downstream of the outlet so as to exhaust the air-fuel mixture from the mixing chamber.

  According to the second embodiment of the boiler, the fan is a turbine arranged upstream of the air inlet so as to propel air towards the mixing chamber, and the boiler adjusts the mixture with the control device A joining tube for joining the device.

  Other features and advantages of the present invention will become apparent from the description given below, by way of example and not limitation, with reference to the accompanying drawings.

1 schematically shows a boiler according to the prior art. 1 schematically shows a boiler according to the prior art. 1 schematically shows an embodiment of a boiler according to the invention. 1 schematically shows an embodiment of a boiler according to the invention. Figure 3 shows a longitudinal section through a first and second valve for stopping and adjusting the flow of gas through the first and second inlets, respectively, of an apparatus for adjusting an air-fuel mixture according to the present invention. Figure 3 shows a longitudinal section through a first and second valve for stopping and adjusting the flow of gas through the first and second inlets, respectively, of an apparatus for adjusting an air-fuel mixture according to the present invention. FIG. 5 shows three cross-sectional views of an apparatus for adjusting an air-fuel mixture according to the present invention, each cut plane being shown in FIG. 1 shows a front view, a side view and an elevation view of an injection block having a device for adjusting an air-fuel mixture according to the present invention. 1 shows a gas / air ratio control device according to the prior art; 1 schematically shows an embodiment according to the invention.

  The main problem here is the combustion of the mixture, and thus the combustion of the mixture between the gaseous fuel and the gaseous oxidant. Gaseous fuels that may be mentioned include natural gas, propane, hydrogen, biogas and the like. The gaseous oxidant is primarily considered ambient air, but can consist of oxygen molecules and the like.

  However, the device for adjusting the mixture should not be limited in its most basic form, in particular to the mixture for oxidation. Accordingly, an air-fuel mixture is to be understood here as meaning any air-fuel mixture of at least two gases. For example, a mixture of two gaseous fuels may be involved to obtain a gaseous fuel mixture.

  Hereinafter any reference to gas should be understood to mean gaseous fuel and more generally to mean the first gas, any reference to air means gaseous oxidant It should be understood and more generally understood to mean, in particular, a second gas that mixes with the first gas.

  In its most widely accepted form, the boiler has a device 1, a gas / air ratio control device 8, a fan 6 and an all air / gas premixed combustion burner 7 for adjusting the mixture. The gas / air ratio control device 8 makes it possible to keep the pressure of the first gas equal to the pressure of the second gas at the inlets for the first and second gases.

  According to a first embodiment, shown by FIG. 3, the fan 6 is an extraction fan arranged downstream of the outlet so as to discharge the mixture from the mixing chamber 11 of the device 1 to regulate the mixture. It is. The fan creates a negative pressure in the mixing chamber 11. The burner 7 is disposed downstream of the extraction fan.

  According to a second embodiment, illustrated by FIG. 4, the fan 6 is a turbine arranged upstream of the air inlet so as to propel air towards the mixing chamber 11. As a result, the boiler according to the second embodiment has a joining tube 81 that joins the control device 8 and the adjusting device 1. The burner 7 is disposed immediately downstream of the extraction fan at the discharge port 20.

  When the gas / air ratio control device 8 and the device 1 for adjusting the mixture are arranged in the enclosure or in the structure and exhibit the exact same air signal pressure, the control device 8 and the adjustment device 1 are joined. The joining tube 81 is not necessary. Joining the controller 8 and the regulator 1 when the gas / air ratio controller 8 and the device 1 for regulating the mixture are arranged in the enclosure or in the structure to indicate an air signal pressure difference The tube 81 is necessary.

  More specifically, the junction tube 81 is located upstream of the inlet 22 so that the controller 8 allows the servo motor of the controller 8 to know the air pressure at the inlet 22 at each moment. Join the region of the regulator 8 and thus make the gas pressure equal to the air pressure. According to the second embodiment of the boiler, this region is also located downstream of the turbine.

  It is understood that the stronger the suction or propulsion caused by the fan 6, the greater the amount of air-fuel mixture discharged from the mixing chamber 11. It is therefore advantageous for the supply to operate the extraction fan 6 at a variable speed so as to discharge a correspondingly variable amount of air-fuel mixture.

  The total air / gas premix burner 7 is configured to burn the mixture. Combustion of the air-fuel mixture is caused by the burner and is even more optimal when the mixing is stable in terms of flow rate and composition, thus ensuring flame and good clean combustion stability.

The boiler therefore
-Adjusting the flow rate of the fuel gas and the flow rate of the oxidant gas; and / or-over the entire operating power range and in particular for lower operating power, for example lower than 6 kW, even lower than 3 kW Stably adjusting the mixing of gas and air with respect to flow rate and / or composition, and / or-over a limited power range, for example in the range of 0.5 kW to 30 kW, ie 2% of the maximum power Advantageously enabling power adjustment to a minimum output showing less than and / or enabling power adjustment at low power, eg, below 6 kW, or even below 3 kW.

  Furthermore, a boiler with a device for adjusting the air-fuel mixture makes it possible to dispense with the need for sequential operation through the ability to meet the minimum adjustment set point, and thus the source of contamination caused by the sequential operation, It makes it possible to avoid the source of failure and the deterioration of overall efficiency.

  Furthermore, the use of the gas / air ratio control device 8 makes it possible to obtain at least the following two advantages.

  First, the control of gas and air flow can be ensured solely by the fan 6, and the mixing ratio is within the limits set by the standards, regardless of the fuel pressure and the length inside the air line. , Can remain constant.

  Second, it makes it possible to eliminate the need for any change in the mixing ratio associated with the change in head loss inside the air line; the use of a 1/1 gas / air ratio controller eliminates the use of so-called conventional valves. To do.

  In its most widely accepted sense and as shown in FIGS. 5 and 6, the device 1 for regulating the air-fuel mixture has a mixing housing 10. The mixing housing 10 has a mixing chamber 11 that communicates with at least a first gas inlet 21, a second air inlet 22 and an outlet 20 for the mixture created by the mixing chamber 11. The expressions “first and second inlets” and “gas and air inlets” may be used interchangeably. In configurations where the mixing housing 10 is located within the boiler's sealed box and the gas valve is located outside the box, the presence of an outlet 82 for possible air signal connection is an option that can be envisaged. .

In addition, in its most widely accepted sense, the device 1 for adjusting the mixture is also:
A first valve 31 configured to regulate or stop the flow of gas through the first inlet 21, and a first valve configured to adjust or stop the flow of air through the second inlet 22. 2 valves 32.

  The regulating device 1 is thus provided for regulating the flow rate of air through the air inlet 22 through the use of a dedicated valve 32.

  According to an important feature of the adjusting device 1, the first and second valves are firmly connected to each other by means of a link member 40. Thus, the first and second valves adjust the gas and air flow together.

  According to another important feature of the regulating device 1, the first and second valves 31, 32 and the first and second inlets 21, 22 are configured so that a joint adjustment of the gas and air flow rates is possible. Is shaped and dimensioned in such a way as to automatically set to a desired ratio.

  For example, for good clean combustion of the air-fuel mixture, the shapes and dimensions of the first and second valves 31 and 32 and the first and second air inlets 21 and 22 are such that the mixture is a gas relative to about 10 air. Has a ratio of 1.

  More specifically, as shown in FIG. 7, the shapes and dimensions of the first and second valves 31 and 32 and the first and second intake ports 21 and 22 are the same as the gas and air intake ports 21 and The gas and air flow rates are adjusted by adjusting the bore cross section for gas through 22 and for air.

  According to the above example, for good clean combustion of the mixture, the bore cross section for the air through the air inlet is about 10 times larger than the bore cross section for the air through the gas inlet.

  More generally, the second inlet 22 has a diameter or end between 2 and 10 of the diameter or end of the first inlet 21, and the valves 31, 32 each rotate. Conical or pyramidal. For example, the cone is regular, arcuate or curved inward.

  The valve is therefore mechanical in nature. This enhances the simplicity and robustness of the adjusting device 1.

  Since the flow rate is equal to this bore section that increases the speed of the flow through the bore section, one skilled in the art will know that each bore section is controlled by a valve and the speed of the flow through each bore section is controlled by a fan 6. Will understand.

  The adjustment device 1 thus advantageously allows the adjustment of the mixture by joint adjustment of the gas and air flow rates.

  According to a particular feature, the adjusting device 1 also has a drive means 50. These drive means 50 are in particular for moving the first or second valve. As shown in FIGS. 3 and 4, the valve 32 associated with the drive means 50 is moved by the drive means 50 between the closed position and the maximum open position of the inlet 22 associated therewith.

  As shown in FIGS. 3 and 4, because the valves 31, 32 are rigidly coupled to each other, the movement of the valve 32 associated with the drive means 50 causes a proportional movement of the other valves 31. The other valve 31 is therefore moved between the closed position and the maximum open position of the associated inlet 21.

  The maximum open position of the inlets 21, 22 corresponds to the position of the largest bore cross section for the gas and air through the gas and air inlets 21, 22 respectively, and the mixture to the desired ratio. Allows to adjust automatically.

  Preferentially, the maximum open position of the inlets 21, 22 by the valves 31, 32 is sufficient for a sufficient amount of air-fuel mixture that is stable in terms of composition and flow rate to the boiler burner reaching an operating output of about 30 kW. Allows discharge.

  According to another particular feature, the first and second valves are moved through a plurality of intermediate open positions between the closed and maximum open positions of the inlets 21,22. The shape and dimensions of the first and second valves 31, 32 allow them to automatically adjust the mixture to the desired ratio regardless of the maximum or intermediate open position of the inlets 21,22. To be done.

  According to another particular feature, the shape and dimensions of the first and second valves change their cross section for movement through the gas and air through the gas and air inlets, respectively. By doing so, it is possible to change the flow rates of gas and air.

  Preferentially, the intermediate open position corresponding to the minimum bore cross section for gas and air is stable in terms of composition and flow rate for boilers that reach an operating power of about 0.5 kW, sufficient Allows the discharge of a quantity of air-fuel mixture to the burner. The next intermediate open position allows a sufficient amount of mixture to be discharged into the burner, which is stable in terms of composition and flow rate, for boilers that reach operating powers between about 0.5 kW and 3 kW. To do.

  In this way, the adjusting device 1 automatically adjusts the air-fuel mixture to a desired ratio regardless of the maximum or intermediate open position of the intake ports 21 and 22, and adjusts the gas and air flow rates to the mixing chamber 11. It is therefore advantageously possible to change the flow rate of the air-fuel mixture to the outlet 20 together.

  The apparatus thus advantageously allows the gas and air flow rates to the mixing chamber 11 and thus the air-flow rate to the outlet 20 to be adjusted and / or varied together. The mixture is also stable in terms of composition and flow rate over the entire range of change.

  According to another particular feature, the gas inlet 21 and the air inlet 22 are centered about exactly the same axis A, and the link member 40 is disposed within the mixing housing 10 and the axis A Has a first rod 41 centered on. According to this particular feature, the first and second valves 31, 32 are firmly fixed to the respective ends of the first rod 41.

  According to another particular feature, the first and second valves 31, 32 and the first rod 41 are made of several parts that are also symmetric in rotation and even in revolution. Preferably, the first and second valves 31, 32 and the first rod 41 are made of one piece that is symmetrical in rotation and even in revolution. For example, the first and second valves 31, 32 and the first rod 41 are made of aluminum or brass.

  The device thus advantageously allows an axial, simple, mechanical and robust construction of the link member 40.

  According to another particular feature, as shown in FIGS. 5, 6 and 8, the drive member 50 is against the outer wall of the housing 10 on the second rod 51 and the axis A centered on the axis A. It has a linear actuator arranged (in contact). According to this particular feature, the first valve 31 or the second valve 32 is firmly fixed to the end of the second rod 51 and the actuator 52 passes through the outer wall of the housing and the second rod 51. The linear actuator 52 drives the valves 31 and 32 with exactly the same translational movement along the axis A.

  According to another particular feature of the drive member 50, the linear actuator 52 is a stepping motor that ensures the quality and fineness of the adjustment of the air and gas flow rates. As an illustrative example, 30 rotations of the stepping motor correspond to the movement amount of the valves 31 and 32 by 10 mm. As a further illustrative example, for such travel, air inlets with diameters or ends between 13 mm and 22 mm, and gas inlets with diameters or ends between 5 mm and 11 mm, Adjustments between 1 kW and 12 kW are obtained which are stable with respect to flow rate and composition.

  Further, the stepping motor operates at a variable speed according to the instantaneous positions of the first and second valves 31 and 32.

  For regular cones, the cone radius or end varies linearly, and the bore cross section defined by the cone and associated inlet is the square of the cone radius or end for the cone movement at a constant speed. Proportionally changes. Thus, the stepping motor is operated at a reduced speed between the inlet closed position and the intermediate open position corresponding to the minimum bore cross section so that the low flow rate can be precisely adjusted, and then the boiler 2 is It will be appreciated that it may be advantageous to operate at an increased speed so as to quickly reach the maximum operating output.

  In contrast, for arcuate cones, the radius or end of the cone does not change linearly, and the bore cross section defined by the cone and associated inlet is the radius of the cone for constant cone movement. Or it may change linearly with the edges. Therefore, by operating the stepping motor at a constant speed between the closed position of the intake port and the maximum open position, it is possible to both precisely adjust the low flow rate and quickly reach the maximum operation output of the boiler 2. It will be appreciated that it may be advantageous for the cone to be arcuate as possible.

  According to another particular feature, the mixing housing 10 also has a first intake chamber 12 for gas and a second intake chamber 13 for air. The first and second intake chambers 12 and 13 communicate with the mixing chamber 11 via at least the first and second intake ports 21 and 22, respectively.

  According to this last particular feature, at atmospheric pressure, the pressure regulating valve described above allows a pressure equal to atmospheric pressure to be passed to the first intake chamber. Conversely, the gas pressurization means described above allows excessive pressure to be distributed to the first and second intake chambers 12, 13, which excessive pressure is relative to atmospheric pressure or more specifically. Specifically, it is determined with respect to the pressure prevailing in the mixing chamber.

  Also according to this last specific feature, as shown in FIGS. 5 and 6, the discharge 20 is centered on axis A and the first intake chamber 12 is located inside the mixing chamber 11. The first inlet chamber extends beside the first wall having the first inlet 21 and the second wall having the through orifice 60 until it intersects the axis A, which is centered on the axis. As it is pulled, the first rod is free to translate through it. Therefore, the first intake port 21 can face the exhaust port 20 and can be positioned close to it.

  The gas flow at the inlet to the mixing chamber 11 is in the same direction as the air flow at the inlet to the mixing chamber 11 and is directed toward the outlet. In addition, the device also advantageously allows an immediate and total release of gas mixed with air in a small ratio.

  It should also be noted that the air and gas inlets 21, 22 and the discharge 20 are consequently arranged parallel to each other and advantageously facilitate the flow of gas, air and mixture.

According to a first variant, the mixing chamber 11 also leads to a third inlet 23 for gas and a fourth inlet 24 for air, and the adjusting device 1 also:
-A third valve 33 configured to regulate or stop the flow of the first gas through the third inlet 23; and-to regulate the flow of the second gas through the fourth inlet 24 Or a fourth valve 34 configured to stop.

  The third and fourth valves 33 and 34 are fixed so as to adjust or stop the flow rates of the first and second gases passing through the third and fourth intake ports 33 and 34, respectively.

  If the mixture ratio is essentially set by the shape and size of the first and second valves 31, 32 in conjunction with the first and second inlets 21, 22, the first and second The intake ports 21 and 22 are larger than the third and fourth intake ports 23 and 24, respectively.

  According to the second variant, at least one of the two ends of the first rod 41 is threaded and complementarily, at least one of the first and second valves 31, 32 is , Female thread is formed. For example, the second valve 32 is internally threaded in a manner that is centered on the axis A and intended to be rigidly secured to the first rod 41 by the end of the first rod 41. The end of the first rod 41, which is intended to be firmly fixed to the second valve 32, is connected to the first and second valves 31, 32 together with the internal thread formation of the second valve 32; The threads are formed to form a screw-nut mechanism that allows the distance between them to be set precisely. Furthermore, the screw-nut mechanism can have a device for preventing rotation so that the setting of the distance between the first and second valves 31, 32 remains constant over time. . The blocking device may comprise a nut that is threaded into the thread of the first rod 41 before the second valve 32 is threaded into the thread of the first rod 41, which nut is then In order to prevent any rotation between the first rod 41 and the second valve 32, it is brought into contact with the second valve 32, and the second valve is therefore in a precisely set position. Retained.

  The adjusting device 1 according to the two variants described above consequently requires any precise machining of the first and second valves 31, 32 and the first and second inlets 21, 22, for example by drilling. It is advantageously possible to precisely adjust the mixture ratio without having to In other words, the machining imperfections of the first and second valves 31, 32 and the first and second inlets 21, 22 due to, for example, imperfect drilling are the third and fourth. It can easily be compensated by a subsequent adjustment of the distance between the valves 33, 34 or between the first and second valves 31, 32.

It will be apparent to those skilled in the art that the present invention allows many other specific forms of embodiments without departing from the scope of application of the invention as set forth in the claims. Accordingly, the embodiments are to be regarded as illustrative and can be modified in the fields defined by the scope of the appended claims.

Claims (18)

A mixing housing with a mixing chamber, which leads to at least a first inlet for the first gas, a second inlet for the second gas and an outlet for the mixture;
A first valve configured to regulate or stop the flow rate of the first gas through the first intake port; and- adjusting the flow rate of the second gas through the second intake port. A second valve configured to turn on or off;
The first and second valves are firmly connected to each other by a link member so as to jointly adjust or stop the flow rates of the first and second gases, and the first and second valves And the first and second inlets are shaped and dimensioned such that the joint adjustment of the flow rates of the first and second gases automatically adjusts the mixture to a desired ratio. Decided,
A device for adjusting the mixture. The apparatus also includes means for driving the operation of the first or the second valve via a plurality of intermediate open positions between a closed position of the intake port and a maximum open position of the intake port. Have
The movement of the valve associated with the drive means adjusts the flow rate of the first and second gases to the mixing chamber and thus the flow rate of the mixture to the outlet. Including the proportional movement of the valve,
The apparatus of claim 1. The shapes and dimensions of the first and second valves and the first and second intake ports are the same as those of the first and second gases passing through the first and second intake ports, respectively. Adjusting and / or changing the flow rates of the first and second gases by adjusting and / or changing the bore cross section for
The apparatus according to claim 1 or 2. The mixing housing also includes a first intake chamber for the first gas and a second intake chamber for the second gas, wherein the first and second intake chambers are respectively Communicating with the mixing chamber through at least each of the first and second inlets;
Apparatus according to any one of claims 1 to 3. The first inlet and the second inlet are centered about the exact same axis, and the link member is disposed within the mixing housing and is centered on the axis. The first and second valves are rigidly secured to each end of the first rod,
Apparatus according to any one of claims 1 to 4. The drive means comprises a second rod centered on the shaft and a linear actuator disposed on the shaft relative to the outer wall of the housing, the first valve or the second valve being The actuator is rigidly fixed to the end of the second rod and the actuator engages the other end of the second rod through the outer wall of the housing, and the linear actuator follows the axis. Driving the valve with exactly the same translational movement,
Apparatus according to any one of claims 2 to 5. The outlet is centered on the shaft;
In the first intake chamber, the first intake chamber has the first intake port so that the first intake port faces the exhaust port and is close to the exhaust port. Extending into the mixing chamber by the second wall having a first wall and a through-orifice until it intersects the axis, the through-orifice being centered on the axis and through the through-orifice The first rod freely translates,
7. A device according to claim 5 or 6 as dependent on claim 4. The mixing chamber also leads to a third inlet for the first gas and a fourth inlet for the second gas;
The apparatus also includes a third valve configured to regulate or stop the flow rate of the first gas through the third inlet and the flow rate of the second gas through the fourth inlet. A fourth valve configured to regulate or stop the first and second gases through the third and fourth inlets. The flow rate of each is fixed so as to be adjusted or stopped invariably.
Apparatus according to any one of claims 1 to 7. The 2 of the first rod can be set precisely so that the distance between the first and second valves that are rigidly fixed to each end of the first rod can be set. At least one of the two ends is threaded and, complementarily, at least one of the first and second valves is formed with a female thread,
Apparatus according to any one of claims 5 to 7. The first and second valves and the first rod are made of one or more parts that are rotationally symmetric, and further symmetric with respect to a common point,
Apparatus according to any one of claims 1 to 8. The second air inlet has a diameter or end that is between 2 to 10 times the diameter or end of the first air inlet;
The valves are each in the shape of a rotating cone or pyramid,
Apparatus according to any one of claims 1 to 10. The linear actuator is a stepping motor;
12. Apparatus according to any one of claims 7 to 11. The stepping motor operates at a variable speed according to the instantaneous position of the first and second valves;
The apparatus according to claim 12. The first gas is a fuel and the second gas is an oxidant;
The apparatus according to claim 1. A boiler having a device for adjusting an air-fuel mixture according to any one of claims 1 to 13, wherein the first gas is a fuel and the second gas is an oxidant,
The boiler is:
-A fan configured to exhaust the mixture from the mixing chamber;
-An all air / gas premix burner arranged downstream of the fan for burning the mixture;
A gas / air ratio control device arranged at least upstream of the first air inlet for the first gas;
The apparatus is adapted to provide a gas pressure in a manner such that the amount of gas supplied to the burner has a correspondingly determined amount of combustion air supplied to the burner. Adjust in proportion to
boiler. The fan operates at a fixed or variable speed according to the adjustment range so as to discharge a correspondingly variable amount of the mixture.
The boiler according to claim 15. The fan is an extraction fan disposed downstream of the discharge port so as to discharge the air-fuel mixture from the mixing chamber.
The boiler according to claim 15 or 16. The fan is a turbine disposed upstream of the air inlet to propel the air toward the mixing chamber; the boiler includes the controller and a device for adjusting the mixture; Having a joining tube,
The boiler according to claim 15 or 16.

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