EP2189719A2 - Method for adjusting a heat output of a multi-ring burner, in particular dual ring burner and device for executing such a method - Google Patents

Abstract

The method involves disconnecting a gas flow rate (m-a) for an external burner (3) to reach a small setting power. A gas flow rate (m-i) to an internal burner (5) is adjusted in a cyclic switching operation during adjustment of the heating power to reach the small setting power. An independent claim is included for a device for regulating the heating output of a multi-circuit burner, particularly dual-circuit burner.

Description

The invention relates to a method for adjusting a heating power of a multi-circuit burner according to the preamble of claim 1 and an apparatus for performing such a method according to the preamble of claim. 5

The heating power of a dual-circuit burner can be adjusted via an electronic control device as a function of user-specified heating power levels. The control arrangement regulates the partial gas flows to the inner burner and the outer burner of the dual-circuit burner.

In a generic method for adjusting the heating power of the dual-circuit burner, a gas flow rate to the outer burner is interrupted until a low-setting power in the lower heating power range is reached, while only one gas flow rate to the inner burner is set. Between this small adjustment and the full firing of the dual-circuit burner, that is a maximum power, the gas flow is set to the outer burner.

The gas flow rates to the internal and external burners of the dual-circuit burner are set with complex and expensive control components.

The object of the invention is to provide a method for adjusting the heat output of a multi-circuit burner or a device for carrying out such a method, in which the heating power is simplified and adjustable with reduced component expenditure.

The object is solved by the features of claim 1 or claim 5. Preferred embodiments of the invention are disclosed in the subclaims.

According to the characterizing part of claim 1, the gas flow rate to the internal burner is set in a clock switching operation in the adjustment of the heating power until reaching the small adjustment. That is, according to the invention, the setting of the heating power in the lower power range between 0 and the low-setting power is clocked and not continuous. Elaborate control components for continuously increasing or reducing the internal burner gas flow can thus be omitted taking up space in the gas hob. In particular, if the internal burner is associated with only a small heating power range, the heating power of the internal burner can be done despite clocking with sufficient Einstellgüte.

In a power range below the low-setting power, the internal burner is therefore clocked according to the invention. The internal burner is operated at full load while the outside burner is switched off in order to provide the low setting power. Only with a user-side increase in the Heizleistungsstufe on the small adjustment power of the outer burner is switched on. The setting of the heating power to reach the low-setting power can thus be achieved according to the invention omitting a continuously operating actuator alone by the clock switching operation.

While, according to the invention, the gas flow rate to the internal burner is clocked at a heating capacity below the low setting power, the external burner remains out of operation. When adjusting the heating power until reaching the low setting power, the internal burner can always burn at full load during the switch-on times in cyclic operation. Additional control components, which allow, for example, a reduced partial load operation of the internal burner, can be omitted according to the invention in the partial gas line leading to the internal burner.

In a device for carrying out the adjustment process, a first and a second partial gas line may be provided, each leading a partial gas flow to the inner burner and a partial gas flow to the outer burner. In the guided to the outer burner partial gas line, an actuator is connected, which allows a continuous fine adjustment of the heating power between the low-setting and a maximum power. In contrast, a fine adjustment by a working in continuous operation actuator is omitted in the internal burner partial gas line. Rather, the guided through the inner burner partial gas line partial gas flow is adjusted by a simple clock valve, that works until it reaches the low-end setting in the cycle-switching mode. The small adjustment itself is achieved by a continuous operation of the internal burner, in which the clock valve is permanently open. When the low setting power is exceeded, the inner burner continues to operate at full load, while the gas flow rate to the outer burner is continuously adjustable.

Each leading to the inner burner and the outer burner partial gas lines can branch off from a main gas line. In an embodiment, the timing valve may be disposed directly in the main gas passage. In addition, a check valve can be connected in the main gas line, which interrupts a gas passage to the two partial gas lines. When the shut-off valve is open and the actuator in the outer burner partial gas line is closed, the gas flow rate to the inner burner can be adjusted by means of the timing valve.

As an alternative to the above embodiment, the timing valve may be arranged directly in the partial gas line leading to the internal burner. The blocking element can be connected directly upstream of the actuator for continuous heating power adjustment. Alternatively, the blocking element can be integrated directly into the actuator of the outer burner partial gas line.

For a space-saving design, the gas paths of the partial gas streams to the inner and outer burners in a structural unit or a valve block can branch off from a gas path of the main gas stream. In the control module, the already mentioned check valve, the timing valve and the actuator can be integrated space-saving. The check valve may preferably be formed as a linearly adjustable locking member in the assembly. The locking member can be adjusted between a blocking position in which the gas paths are interrupted, and a passage position in which the gas paths are opened. In the passage position of the locking member, the internal burner can be subjected to full load.

The actuator associated with the outer burner for continuous power adjustment may cooperate with the locking member in the assembly. The actuator can be adjusted by way of example by means of a stepper motor linearly in a stroke movement, in the it can be adjusted together with the locking member as a movement-coupled composite between the blocking position and the passage position.

In the passage position of the blocking member, as mentioned above, the gas path to the internal burner is free. In this passage position, the actuator may now perform motion-decoupled from the locking member further linear movement to open a flow passage to the outer burner and set continuously.

The timing valve may be provided in the assembly or the valve block directly in the main gas path. As mentioned, the clock switching operation takes place when put out of operation outside burner. This means that in the valve block on the one hand, the locking member is in the passage position, on the other hand, however, the actuator keeps the flow passage to the outer burner still closed.

In an alternative embodiment, a bypass line may be provided in the control arrangement which, in the blocking position of the blocking member, connects the main gas path to the outlet of the control arrangement leading to the internal burner.

Below, three embodiments of the invention with reference to the accompanying figures are shown.

Fig. 1

in einem Blockschaltbild ein Gaskochfeld mit drei Zweikreisbrennern mit jeweils zugeordneten Steueranordnungen zur Einstellung der Heizleistung, die gemäß einem ersten, zweiten und dritten Ausführungsbeispiel ausgeführt sind;

Fig. 2

eine Heizleistungskennlinie eines der Zweikreisbrenner;

Fig. 3

die Steueranordnung gemäß dem ersten Ausführungsbeispiel in einem Ventilblock integriert;

Fig. 4 und 5

unterschiedliche Betriebszustände des Ventilblockes; und

Fig. 6

in einer Ansicht entsprechend der Fig. 3 die Steueranordnung des zweiten Ausführungsbeispieles.

Show it:

Fig. 1

a block diagram of a gas hob with three dual-circuit burners each having associated control arrangements for adjusting the heating power, which are executed according to a first, second and third embodiment;

Fig. 2

a heating performance characteristic of one of the dual-circuit burners;

Fig. 3

integrated the control arrangement according to the first embodiment in a valve block;

4 and 5

different operating states of the valve block; and

Fig. 6

in a view corresponding to Fig. 3 the control arrangement of the second embodiment.

In the Fig. 1 a gas hob with three dual-burner 1 is shown in a block diagram. Each of the dual-circuit burners 1 has an annular outer burner 3 and an annular inner burner 5. The dual-circuit burners 1 are supplied with gas via a common distribution line 7. For each dual-circuit burner 1 branches off from the distribution line 7 from a main gas line 9, which is divided into two parallel partial gas lines 11, 13. The partial gas lines 11, 13 terminate in each case in burner nozzles, not shown here, of the outer burner 3 and the inner burner 5. The distribution line 7 has on the inlet side a main valve 15, which is opened upon activation of the gas hob.

To set the heating power of each of the dual-circuit burner 1 is assigned a control arrangement consisting of the control and regulating components described below. In the Fig. 1 are the control arrangements for adjusting the heating power of the dual-circuit burner 1 executed in different embodiments.

The Indian Fig. 1 shown upper dual-circuit burner 1 is controlled by the control arrangement according to the first embodiment in which in the main gas line 9, a clock valve 17 and a downstream check valve 19 is arranged. In the leading to the outer burner 3 partial gas line 11, an actuator 21 is arranged for a continuous adjustment of the guided to the outer burner 3 gas flow rate ṁ _a . In contrast, is omitted in the guided to the inner burner 5 partial gas line 13 to such an actuator.

The valves 15, 17 and 19 and the actuator 21 are connected via signal lines 23 indicated with an electronic control device 25 in signal communication. The electronic control device 25 may have an operating knob 27 as an input unit, with the user side heating power stages of the dual-circuit burner 1 are predetermined. In the Fig. 2 is a Heizleistungsdiagramm shown, in which the heating powers H _outside and H _{inside of} the outer burner 3 and the inner burner 5 are shown in dependence of the user-adjustable heat output stages. As a result, the dual-circuit burner works 1 in the lower heating power range up to the heating power level "4" only with the inner burner 5, while the outer burner 3 is disabled. The adjustment of the heating power between the heating power levels "1" to "4" is carried out not continuously, but in a clock switching operation of the clock valve 17th

Like from the Fig. 2 shows, while the clock frequency of the clock valve 17 is increased to the heating power level "3". In the heating power stage "4", a so-called low-setting power H _{k of} the internal burner 5 is reached, in which the internal burner 5 is operated at maximum power in full fire. In the higher power levels "5" to "11" of the outer burner 3 is switched on, the gas flow rate ṁ _a by means of the actuator 21 is continuously adjustable, while the inner burner 5 is constantly operated with its small control power H _K.

Upon reaching or falling short of the small adjustment power H _K is therefore switched according to the invention directly from the continuous heating power setting in the clock mode of the internal burner 5.

In the Fig. 3 the control arrangement of the first embodiment is compactly integrated in a valve block 41. The valve block 41 has as the main gas line 9 a gas inlet and two outlets 29, 31, which lead the gas flow rates ṁ _a and ṁ _i to the inner and outer burners 3, 5. In the Fig. 3 the actuator 21 is rotationally symmetrical, which is height adjustable via a linear stepper motor 35. The actuator 21 is in this case with a radially outer guide surface 37 or with a ring seal 38 disposed therein in sliding contact with the cylindrical cavity 39 of the valve block 41 defining inner wall. The stepping motor 35 is controlled by the control device 25.

The actuator 21 goes down in the axial direction in a stepped portion 43 of smaller diameter, on which an adjusting sleeve 45 is formed. The adjusting sleeve 45 projects according to the Fig. 3 spaced via an annular gap 47 into a central adjusting bore 49 of a locking member. The adjusting bore 49 is conically widened upward in order to increase the flow cross-section of the annular gap 49 at a height adjustment of the adjusting sleeve 45.

The locking member corresponds functionally in the Fig. 1 Shut-off valve 19 shown, so that subsequently the locking member is denoted by the same reference numeral 19. The locking member 19 is also in sliding contact with the inner wall of the cylindrical cavity 39 of the valve block 41. Axially below the guide surface 51, the locking member 19 on a portion of smaller diameter, which is surrounded by a helical compression spring 53.

According to the Fig. 3 and 4 is the locking member 19 in response to the stroke position of the actuator 21 between a in the Fig. 3 shown blocking position I and one in the Fig. 4 shown passage position II height adjustable, in which the locking member 19 is pressed by means of the helical compression spring 53 against a ring stop 55 of the valve housing 41.

In the Fig. 3 blocking position I shown pushes the locking member 19 with the interposition of a ring seal against a used in the valve block cavity 31 rotationally symmetrical flow guide 57 in which an upwardly opening axial bore 59 merges into a transverse bore 61 which is fluidly connected via an annular groove with the inner burner outlet 31 ,

The in the Fig. 4 shown passage position II of the locking member 19 forms as a flow passage 63, a free axial gap between the locking member 19 and the flow guide 57, which releases a gas path 65 to the inner burner outlet 31. The gas path 65 corresponds to the partial gas line 13 of FIG. 1 ,

In the region of the inlet 9 of the valve block 41, the timing valve 17 is inserted in an inlet chamber 67, which is here a solenoid valve. In the Fig. 3 pushes the valve stem 17 of the timing valve 17 with its valve disc 69 gas-tight against a corresponding valve seat in the valve block 41st

To set the burner heating power in the lower power range, the locking member 19 is first by appropriate control of the actuator 21 in its passage position II according to the Fig. 4 emotional. Geleichzeitig the clock valve 17 is driven by the control device 25 in a predetermined clock frequency. In this way, the heating power levels "1" to "4" can be set in the lower power range.

In the heating power stage 4, the clock valve 17 is permanently in its open position, so that the internal burner 5 is supplied with maximum gas flow rate ṁ _i . At the same time, the outer burner 3 is put out of operation in the heating power stages "1" to "4".

In the adjusting movement between the blocking position I and the passage position II, the actuator 21 are adjusted together with the locking member 19 as a motion-coupled composite. On the other hand, starting from the passage position II, the actuator 21 can be moved further upwards in the direction of the stepping motor 35, as shown in FIG Fig. 5 is shown. In such a lifting movement of the actuator 21 whose adjusting sleeve 45 is moved relative to the adjusting bore 49, whereby the adjusting bore 49 is opened upwards and thus a gas path through the annular gap 47 is exposed to the outer burner outlet 29. Depending on the height position of the adjusting sleeve 45, the flow cross-section of the annular gap 47 can be varied, whereby the user-specified heating output stage is adjustable.

In the Fig. 1 the heating power setting of the middle dual-circuit burner 1 is performed by a control arrangement according to the second embodiment. Accordingly, the control arrangement, as in the first embodiment, the arranged in the main gas line timing valve 17. In addition, in the partial gas line 11, the actuator 21 for continuous adjustment of the gas flow rate ṁ _a to the outer burner 3 is connected. In contrast to the first embodiment, the check valve 19 is omitted. The closing function of the blocking valve for blocking the partial gas lines 11, 14 is thus taken over by the clock valve 17.

Starting from the in the Fig. 3 to 5 shown valve block 41, the control arrangement of the second embodiment according to the Fig. 6 be executed. The valve block 41 of Fig. 6 is substantially identical to the valve block 41 of the preceding figures. In contrast to the first exemplary embodiment, a bypass line 71 is provided in the flow guide element 57, which permits a flow connection between the gas inlet 9 and the inner burner outlet 31 even when the blocking element 19 is in the blocking position I.

According to the Fig. 1 the heating power of the lower dual-circuit burner 1 is adjusted by means of a control arrangement according to the third embodiment. As a result, is in In contrast to the first two embodiments, the timing valve 17 is switched directly in the leading to the inner burner 5 partial gas line 13. The check valve 19 is in contrast connected directly in the leading to the outer burner 3 partial gas line 11, upstream of the actuator 21. In each of the control arrangements of Fig. 1 the clock and check valves 15, 17, 19 and the actuators 21 are controlled by means of the electronic control device 25.

LIST OF REFERENCE NUMBERS

1

Dual-circuit burner

3

external burner

5

internal burner

7

distribution line

9

Main gas line

11, 13

Partial gas lines

15

main valve

17

timing valve

19

check valve

21

actuator

23

signal lines

25

electronic control device

27

input unit

29

External burner outlet

31

Inner burner outlet

35

stepper motor

37

guide surface

38

ring seal

39

cylindrical cavity

41

manifold

43

Actuator section with reduced diameter

45

adjusting sleeve

47

annular gap

49

set hole

51

guide surface

53

compression spring

55

annular stop

57

flow guide

59

axial bore

61

cross hole

63

Flow passage

65

first gas way

67

inlet chamber

69

valve disc

71

Bypass line

I

blocking position

II

Passage position

_a

Gas flow to the external burner

_i

Gas flow rate to the internal burner

H

heating capacity

H _k

Small parking performance

H _max

maximum heating power of the external burner

H _min

minimum heating power of the external burner

Claims (15)

Method for setting a heating power (H) of a multi-circuit burner (1), in particular dual-circuit burner, with an external burner (3) and an internal burner (5), in which a gas flow rate (ṁ _a ) to the external burner (H _k ) is reached until 3) is interrupted, and only a gas flow rate (ṁ _i ) is set to the internal burner (5), wherein between the small actuating power (H _k ) and a maximum power (H _max ) gas flow rate (ṁ _a ) to the outer burner (3) with the Small adjusting capacity (H _k ) operated internal burner (5) is continuously adjusted, characterized in that when adjusting the heating power (H) until reaching the low-setting power (H _k ), the gas flow rate (ṁ _i ) to the internal burner (5) set in a clock switching operation becomes. A method according to claim 1, characterized in that during the adjustment of the heating power (H) until reaching the low setting power (H _k ) of the internal burner (5) always burns at full load during the switch-on in the cycle operation. A method according to claim 1 or 2, characterized in that for the provision of the low-level power (H _k ), the inner burner (5) is operated at full load, while the outer burner (3) is out of operation. Method according to one of the preceding claims, characterized in that the setting of the heating power (H) until reaching the small actuating power (H _k ) takes place with the omission of a continuously operating actuator alone by the clock switching operation. Device for setting a heating power (H) of a multi-circuit burner (1), in particular dual-circuit burner, with an outer burner (3) and an inner burner (5), with a first partial gas line (11), which leads a partial gas flow to the outer burner (3), and a second partial gas line (13) which leads a partial gas flow to the internal burner (5), in which first partial gas line (11) an actuator (21) for continuous Setting of the heating power (H) between a low-setting power (H _k ) and a maximum power (H _max ) is connected, characterized in that the guided through the internal burner partial gas line (13) partial gas flow is associated with a timing valve (17), which is up to Achieving the low setting power (H _k ) adjusts the partial gas flow to the internal burner (5) in the cycle switching operation. Apparatus according to claim 5, characterized in that the first and the second partial gas line (11, 13) branch off from a main gas line (9), in which main gas line (9) in particular the clock valve (17) and preferably a check valve (19) are connected. Apparatus according to claim 5 or 6, characterized in that in the inner burner (5) leading partial gas line (13), the clock valve (17) is arranged. Device according to one of claims 5 to 7, characterized in that in the part of the outer burner (3) partial gas line (11) the actuator (21) is connected upstream of a check valve (19). Device according to one of claims 5 to 8, characterized in that the control arrangement for adjusting the heating power (H) in a structural unit (41), such as a valve block, with a gas inlet and at least two to the inner and outer burners (3, 5) leading outlets (29, 31) is integrated. Apparatus according to claim 9, characterized in that the blocking valve (19) as a linearly adjustable locking member in the structural unit (41) is formed, which interrupts the gas paths in a blocking position (I) and in a passage position (II) opens this. Apparatus according to claim 10, characterized in that in the passage position (II) of the locking member (19) of the internal burner (5) can be acted upon by full load. Apparatus according to claim 10 or 11, characterized in that the actuator (21) for adjusting the heating power (H) between the low-setting power (H _k ) and the maximum power (H _max ) the locking member (19) adjusted linearly, wherein the locking member (19) is adjustable together with the actuator (21) as a movement-coupled composite between the blocking position (I) and the passage position (II). Apparatus according to claim 12, characterized in that in the passage position (II) of the locking member (19) the actuator (21) from the locking member (19) is releasable for continuously setting a flow cross-section of a flow passage (47) to the outer burner (3). Device according to one of claims 9 to 13, characterized in that the gas paths for the partial gas flows in the structural unit (41) as the main gas line (9) upstream of a main gas path for the main gas stream, in which the timing valve (17) is arranged. Device according to one of claims 10 to 14, characterized in that in the structural unit (41) a bypass line is provided which in the blocking position (I) of the locking member (19) the main gas path with the internal burner (5) leading outlet ( 31) of the assembly (41) connects.

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