EP2657602A2

EP2657602A2 - Gas stove and gas flow control device thereof

Info

Publication number: EP2657602A2
Application number: EP13164292.8A
Authority: EP
Inventors: Jose Redondo Moritz; Jinhua Wu; Xue Zou
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2012-04-28
Filing date: 2013-04-18
Publication date: 2013-10-30
Anticipated expiration: 2033-04-18
Also published as: ES2825951T3; CN103375609B; EP2657602A3; CN103375609A; EP2657602B1

Abstract

A gas flow control device for a gas stove, comprising at least one gas valve (1, 4, 5) and a driving device (11, 12, 13, 14, 15, 16), the driving device (11, 12, 13, 14, 15, 16) being configured for actuating the at least one gas valve (1, 4, 5) between an open and a closed position thereof in a linear manner.

Description

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to the field of gas stoves, and more particularly to the technical field of gas flow control of a gas stove.

Related Art

Gas stoves are household cookers commonly used in people's daily life, and mainly use liquefied flammable gas as fuel for burning. According to the different types of the liquefied flammable gas, the gas stoves can be classified into multiple types, such as liquefied gas stoves, coal gas stoves, and natural gas stoves. Gas stoves may also be classified according to their structure into single gas stoves, double gas stoves, single-burner gas stoves, multiple-burner gas stoves, table gas stoves, and embedded gas stoves. Moreover, according to their different gas control structures, the gas stoves can be classified into mechanically controlled gas stoves and electronically controlled gas stoves.
Compared with the mechanically controlled gas stove, the electronically controlled gas stove is a new type of gas stove. As increasingly more electronically controlled gas stoves are used, people pay increasingly much attention to the problems of the electronically controlled gas stove. One issue is that the existing electronically controlled gas stoves use a plug valve to control the gas flow. A structure of a typical plug valve is shown in FIG. 6. However, the size of the plug valve is small, and the number and the size of holes opened on a valve core are limited, so it may, in some instances, be difficult to implement fine tuning and to smoothly regulate the gas flow.

SUMMARY OF THE INVENTION

In view of the foregoing, the main objective of the present invention is to provide a gas flow control device applicable to an electronically controlled gas stove.
A gas flow control device according to claim 1 is provided. The dependent claims describe further embodiments and features.
A gas flow control device for a gas stove includes: a driving device, a valve body, a first valve rod, a second valve rod, a first valve core, a second valve core, a first reset device, and a second reset device, where the valve body includes a gas inlet, a first gas outlet, and a second gas outlet; when the gas flow control device is in a turn-off state, the first valve core is held against an inner wall of the valve body under the action of the first reset device, to close a gas flow passage through which gas flowing from the gas inlet flows to the first gas outlet, and meanwhile, the second valve core is also held against the inner wall of the valve body under the action of the second reset device, to close a gas flow passage through which gas flowing from the gas inlet flows to the second gas outlet; the driving device is used for directly or indirectly driving the first valve rod to move, and the first valve rod further drives the first valve core to move, to open the gas flow passage through which gas flowing from the gas inlet flows to the first gas outlet; and the driving device is further used for directly or indirectly driving the second valve rod to move, and the second valve rod further drives the second valve core to move, to open the gas flow passage through which gas flowing from the gas inlet flows to the second gas outlet. The foregoing technical solution is a new gas flow control solution different from the existing plug valve and can fundamentally overcome the disadvantages of the plug valve that fine tuning is not easy and it is difficult to smoothly regulate the gas flow.
Optionally, the driving device is a linear motor.
Optionally, the driving device includes a motor and a conversion device; and the conversion device is used for converting rotational motion of the motor into linear motion, to directly drive the first valve rod and/or the second valve rod to make linear motion.
Optionally, the motor includes a shaft rod; the conversion device includes a gear wheel and a gear rack engaged with each other; the gear wheel is connected to the shaft rod; and the gear rack is connected to the first valve rod and/or the second valve rod.
Optionally, the motor includes a shaft rod; the conversion device includes a cam; and the cam is connected to the shaft rod.
Optionally, a guide rail portion is disposed on a side wall of the cam surrounding the shaft rod; and a side end of the first valve rod and/or the second valve rod is held against a bottom wall of the guide rail portion.
Optionally, a projection of the bottom wall of the guide rail portion on a plane vertical to the shaft rod is at least partially of a logarithmic spiral structure or a circular arc structure. Especially, when the projection is of the logarithmic spiral structure, an excellent effect of smoothly regulating the gas flow can be achieved.
Optionally, the cam is an eccentric wheel.
Optionally, the driving device is further used for directly or indirectly controlling a motion range of the first valve rod, to control an open degree of the gas flow passage through which gas flowing from the gas inlet flows to the first gas outlet; and the driving device is further used for directly or indirectly controlling a motion range of the second valve rod, to control an open degree of the gas flow passage through which gas flowing from the gas inlet flows to the second gas outlet. In this way, a better effect of smoothly regulating the gas flow can be achieved.
Optionally, the first reset device includes an elastic component and a stop portion, and the stop portion is disposed on the inner wall of the valve body; and the stop portion is used for stopping the elastic component.
Optionally, the first valve core is of a truncated cone structure, where the truncated cone is disposed with a tangent plane parallel to an axis of the truncated cone and intersecting with a lower bottom surface and a side surface of the truncated cone. The tangent plane is disposed to provide a guide rail for reciprocating motion of the first valve core, thereby facilitating improvement of the stability of motion of the first valve rod and the first valve core.
Optionally, the first valve rod is connected and fixed to an upper bottom surface of the truncated cone, the second valve rod is connected and fixed to the lower bottom surface of the truncated cone, and the first reset device is held against the lower bottom surface of the truncated cone.
Optionally, when the first valve core moves to a certain degree, the first valve core drives the second valve rod, and the second valve rod further drives the second valve core to move, to open the gas flow passage through which gas flowing from the gas inlet flows to the second gas outlet. In this way, it is conveniently implemented that the driving device indirectly drives the second valve rod to move.
Optionally, the gas flow control device is further disposed with a third valve rod, a third valve core, and a third reset device; the valve body further includes a third gas outlet; when the gas flow control device is in the turn-off state, the third valve core is held against the inner wall of the valve body under the action of the third reset device, to close a gas flow passage through which gas flowing from the gas inlet flows to the third gas outlet; and the driving device is used for directly or indirectly driving the third valve rod to move, and the third valve rod further drives the third valve core to move, to open the gas flow passage through which gas flowing from the gas inlet flows to the third gas outlet.
Optionally, the first gas outlet is used for supplying gas to an inner-ring fire cover; the second gas outlet is used for supplying gas to an outer-ring fire cover.
Optionally, the driving device is used for directly or indirectly driving the first valve rod to make linear motion, and the first valve rod further drives the first valve core to move, to open the gas flow passage through which gas flowing from the gas inlet flows to the first gas outlet; and the driving device is used for directly or indirectly driving the second valve rod to make linear motion, and the second valve rod further drives the second valve core to move, to open the gas flow passage through which gas flowing from the gas inlet flows to the second gas outlet.
Optionally, the conversion device comprises a crank slide block.
Optionally, the first valve rod and the second valve rod are connected to each other; and the conversion device is used for directly driving the first valve rod and the second valve rod to make linear motion together.
Optionally, the first valve rod and the second valve rod are of an integral structure.
Optionally, the conversion device includes a first conversion device and a second conversion device; the first conversion device is used for converting rotational motion of the motor into linear motion, to directly drive the first valve rod to make linear motion; and the second conversion device is used for converting rotational motion of the motor into linear motion, to directly drive the second valve rod to make linear motion.
Optionally, the conversion device comprises a screw and a nut.
Optionally, the first valve rod and the second valve rod are connected to each other; and the driving device is used for directly driving the first valve rod and the second valve rod to make linear motion together.
Optionally, the second valve core is of a truncated cone structure or a cone structure.
The present invention further provides a gas stove, disposed with the gas flow control device according to any one of the foregoing gas flow control devices. A new gas flow control solution different from the existing plug valve is adopted, so the disadvantages of the plug valve that fine tuning is not easy and it is difficult to smoothly regulate the gas flow can be fundamentally overcome.
The summary of the present invention is not intended to describe all possible implementation manners of the present invention. In the whole application, guidance is provided through examples, and the examples can be used in any feasible combination.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are merely provided to exemplarily illustrate and explain the present invention, but not limit the scope of the present invention, wherein:

FIG. 1 is a schematic structural view of a gas flow control device for a gas stove according to Embodiment A of the present invention;
FIG. 2 is another schematic structural view of the gas flow control device for a gas stove according to Embodiment A of the present invention;
FIG. 3 is a schematic structural view of a first valve core of the gas flow control device for a gas stove according to Embodiment A of the present invention;
FIG. 4 is a schematic view showing a fitting relationship between a conversion device and a first valve rod of a gas flow control device for a gas stove according to Embodiment B of the present invention;
FIG. 5 is a schematic view showing a fitting relationship between a conversion device and a first valve rod and a second valve rod of a gas flow control device for a gas stove according to Embodiment C of the present invention; and
FIG. 6 is a schematic structural view of an existing plug valve.

Same reference numerals refer to same or functionally equivalent elements unless indicated otherwise. Meanings of the reference numerals:

1: valve body; 2: first valve rod; 3: second valve rod; 4: first valve core; 5: second valve core; 6: first reset device; 7: second reset device; 8: gas inlet; 9: first gas outlet; 10: second gas outlet; 11: motor; 12: shaft rod; 13: gear wheel; 14: gear rack; 15: cam; 16: guide rail portion; 17: tangent plane; 18: stop portion; 19: bottom wall of the guide rail portion.

DETAILED DESCRIPTION OF THE INVENTION

To make the objectives, solutions and beneficial effects of the present invention clearer, the present invention is further illustrated with reference to the accompanying drawings and exemplary embodiments. It should be first noted that, the same or similar features have the same reference numerals in the accompanying drawings in specific description of exemplary implementation manners in the following.

Embodiment A

An embodiment of a gas flow control device for a gas stove provided by the present invention is shown in FIG. 1 and FIG. 2 (in the figures, the shadow part is a section). The gas flow control device includes a driving device, a valve body 1, a first valve rod 2, a second valve rod 3, a first valve core 4, a second valve core 5, a first reset device 6, and a second reset device 7. The valve body 1 includes a gas inlet 8, a first gas outlet 9, and a second gas outlet 10. The first gas outlet 9 is used for supplying gas to an inner-ring fire cover; the second gas outlet 10 is used for supplying gas to an outer-ring fire cover. The driving device includes a motor 11 and a conversion device. The motor 11 includes a shaft rod 12. The conversion device includes a gear wheel 13 and a gear rack 14 engaged with each other. The gear wheel 13 is connected to the shaft rod 12. The gear rack 14 is connected to the first valve rod 2. The conversion device is used for converting rotational motion of the motor 11 into linear motion, to directly drive the first valve rod 2 to make linear motion. The first valve core 4 is of a truncated cone structure. The truncated cone is disposed with two tangent planes 17 (see fig. 3). The two tangent planes 17 are both parallel to an axis of the truncated cone, intersect with a lower bottom surface and a side surface of the truncated cone, and are parallel to each other, as shown in FIG. 3. The first valve rod 2 is connected and fixed to an upper bottom surface of the truncated cone structure of the first valve core 4, and the second valve rod 3 is connected and fixed to the lower bottom surface of the truncated cone structure of the first valve core 4. The first reset device 6 is held against the lower bottom surface of the truncated cone structure of the first valve core 4. Specifically, the first reset device 6 includes a spring and a stop portion 18. The stop portion 18 is disposed on an inner wall of the valve body 1. The stop portion 18 is used for stopping the spring. One end of the spring is held against the stop portion 18, and the other end of the spring is held against the lower bottom surface of the truncated cone structure of the first valve core 4. The second valve core 5 is also of a truncated cone structure. The truncated cone is also disposed with two tangent planes 17. The two tangent planes 17 are both parallel to an axis of the truncated cone, intersect with a lower bottom surface and a side surface of the truncated cone, and are parallel to each other. Specifically, the second reset device 7 includes a spring. One end of the spring is held against the inner wall of the valve body 1, and the other end of the spring is held against the lower bottom surface of the truncated cone structure of the second valve core 5.
When the gas flow control device is in a turn-off state (that is, the gas stove is in a turn-off state), the first valve core 4 is held against the inner wall of the valve body 1 under the action of the first reset device 6, to close a gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9, and meanwhile, the second valve core 5 is also held against the inner wall of the valve body 1 under the action of the second reset device 7, to close a gas flow passage through which gas flowing from the gas inlet 8 flows to the second gas outlet 10. The driving device is used for directly driving the first valve rod 2 to move, and the first valve rod 2 further drives the first valve core 4 to move, to open the gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9. Specifically, after the motor 11 is started, the shaft rod 12 rotates to drive the gear wheel 13 to rotate, the gear wheel 13 further drives the gear rack 14 to move, and the gear rack 14 further drives the first valve rod 2 to move. The first valve rod 2 is partially placed in the valve body 1, and under the restriction of the valve body 1, the first valve rod 2 can only make linear motion.
Moreover, the driving device is further used for indirectly driving the second valve rod 3 to move, and the second valve rod 3 further drives the second valve core 5 to move, to open the gas flow passage through which gas flowing from the gas inlet 8 flows to the second gas outlet 10. Specifically, when the first valve core 4 moves to a certain degree, the first valve core 4 drives the second valve rod 3, and the second valve rod 3 further drives the second valve core 5 to move, to open the gas flow passage through which gas flowing from the gas inlet 8 flows to the second gas outlet 10. Here, it should be noted that, the gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9 and the gas flow passage through which gas flowing from the gas inlet 8 flows to the second gas outlet 10 intersect. When the gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9 is closed, no matter whether the second valve core 5 is held against the inner wall of the valve body 1 (it is only a hypothesis, and in this embodiment, when the gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9 is closed, the second valve core 5 is held against the inner wall of the valve body 1), the gas flow passage through which gas flowing from the gas inlet 8 flows to the second gas outlet 10 is also closed; only when the gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9 is opened, the second valve core 5 can control the gas flow passage through which gas flowing from the gas inlet 8 flows to the second gas outlet 10.
Moreover, the driving device is further used for controlling a motion range of the first valve rod 2, to control an open degree of the gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9, so as to generate different levels. In addition, the driving device is further used for controlling a motion range of the second valve rod 3, to control an open degree of the gas flow passage through which gas flowing from the gas inlet 8 flows to the second gas outlet 10, so as to generate different levels.
The foregoing is only the exemplary embodiment of the present invention and other embodiments may be obtained by modifying, replacing, or adding some technical features. For example, the driving device may also be directly a linear motor. In this way, the conversion device is no longer required. For another example, the conversion device may also be a crack slide block. For another example, the first gas outlet is used for supplying gas to the outer-ring fire cover; the second gas outlet is used for supplying gas to the inner-ring fire cover. For another example, the second valve rod may also be connected and fixed to the upper bottom surface of the truncated cone structure of the second valve core and not connected to the first valve core. For another example, a certain angle may also exist between the two tangent planes. For another example, in order to improve the seal effect of the first valve core and the second valve core with respect to the valve body, a rubber ring or another seal part may also be mounted in a portion of the valve body fitted with the valve core for seal, or materials of the first valve core and the second valve core are rubber or other materials with a good sealing property, or a rubber ring is mounted on outer surfaces of the first valve core and the second valve core.

Embodiment B

The present invention further provides an embodiment of another gas flow control device for a gas stove, which is obtained by making further improvement on the basis of Embodiment A. The only difference between Embodiment B and Embodiment A lies in different structures of the conversion device. FIG. 4 is a schematic view showing a fitting relationship between the conversion device and the first valve rod 2 of this embodiment. For the consideration of brevity, the structural features of this embodiment same as those in Embodiment A are not described herein again and reference may be made to the corresponding description and accompanying drawings in Embodiment A.
A driving device of the embodiment of the gas flow control device for a gas stove includes a motor 11 and a conversion device. The motor 11 includes a shaft rod 12. The conversion device includes a cam 15. The cam 15 is connected to the shaft rod 12. A guide rail portion 16 is disposed on a side wall of the cam 15 surrounding the shaft rod 12. A projection of a bottom wall 19 of the guide rail portion 16 on a plane vertical to the shaft rod 12 is of a logarithmic spiral structure. In other words, the side wall of the cam 15 has a groove 16 for guiding the shaft rod 2. The groove 16 may have a spiral shape, in particular a logarithmic spiral shape. Under the action of the first reset device 6, a side end of the first valve rod 2 is always held against the bottom wall 19 of the guide rail portion 16.
The conversion device is used for converting rotational motion of the motor 11 into linear motion, to directly drive the first valve rod 2 to make linear motion. Specifically, distances from points on the bottom wall 19 of the guide rail portion 16 to the shaft rod 12 are different and change gradually, so when the motor 11 rotates, the shaft rod 12 drives the cam 15 to rotate, so that the first valve rod 2 moves.
The foregoing is only the exemplary embodiment of the present invention and other embodiments may be obtained by modifying or replacing some technical features. For example, the cam may also be an eccentric wheel. For another example, when the gas flow control device is in a turn-off state (that is, the gas stove is in a turn-off state), the side end of the first valve rod may also be not held against the bottom wall of the guide rail portion.

Embodiment C

The present invention further provides an embodiment of another gas flow control device for a gas stove, which is obtained by making further improvement on the basis of Embodiment B. The main difference between Embodiment C and Embodiment B lies in that, in Embodiment B, the driving device directly drives the first valve rod 2 to move and indirectly drives the second valve rod 3 to move; while in this embodiment, the driving device directly drives the first valve rod 2 and the second valve rod 3 to move. FIG. 5 is a schematic view showing a fitting relationship between the conversion device and the first valve rod 2 and the second valve rod 3 of this embodiment. For the consideration of brevity, the structural features of this embodiment same as those in Embodiment B are not described herein again and reference may be made to the corresponding description in Embodiment B.
As shown in FIG. 5, the first valve rod 2 and the second valve rod 3 are of an integral structure and are totally fork-shaped. A common end of the first valve rod 2 and the second valve rod 3 is always held against the bottom wall 19 of the guide rail portion 16. The first valve rod 2 is connected to a first valve core 4 and the second valve rod 3 is not connected to the second valve core 5.
The conversion device is used for converting rotational motion of the motor 11 into linear motion, to directly drive the first valve rod 2 and second valve rod 3 to make linear motion. Specifically, after the motor is started, the shaft rod 12 rotates to drives the first valve rod 2 and second valve rod 3 to move, and the first valve rod 2 drives the first valve core 4 to move, so as to open the gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9. The motor 11 continuously rotates, when an open degree of the gas flow passage through which gas flowing from the gas inlet 8 flows to the first gas outlet 9 is gradually increased to a certain degree, the second valve rod 3 touches the second valve core 5 and pushes the second valve core 5 to move, so as to open the gas flow passage through which gas flowing from the gas inlet 8 flows to the second gas outlet 10.

Embodiment D

The present invention further provides an embodiment of another gas flow control device for a gas stove, which is obtained by making further improvement on the basis of Embodiment A. The main difference between Embodiment D and Embodiment A lies in that, this embodiment includes two functional modules separated from each other and used for converting rotational motion of a motor into linear motion, and Embodiment A includes only one functional module of such a type. For the consideration of brevity, the structural features of this embodiment same as those in Embodiment A are not described herein again and reference may be made to the corresponding description and accompanying drawings in Embodiment A.
Specifically, the conversion device of this embodiment includes a first conversion device and a second conversion device. The first conversion device is used for converting rotational motion of the motor into linear motion, to directly drive the first valve rod to make linear motion. The second conversion device is used for converting rotational motion of the motor into linear motion, to directly drive the second valve rod to make linear motion.

Embodiment E

The present invention further provides an embodiment of a gas stove, disposed with the gas flow control device according to any one of Embodiment A to Embodiment D. For the consideration of brevity, the structural features of the gas flow control device are not described herein again and reference may be made to the corresponding description and accompanying drawings in Embodiment A to Embodiment D.
The embodiment of the gas stove is further disposed with a self-priming electromagnetic valve. When the gas stove is in a turn-off state, the self-priming electromagnetic valve closes a gas flow passage through which gas flows to the gas inlet 8. When the gas stove is turned on, a control module of the gas stove supplies power to the self-priming electromagnetic valve and the self-priming electromagnetic valve acts to open the gas flow passage through which gas flows to the gas inlet 8. When the gas stove is in a burning state, a thermoelectric couple of the gas stove supplies power to the self-priming electromagnetic valve so that the gas flow passage through which gas flows to the gas inlet 8 is kept in an open state. When accidental flameout occurs or the gas stove is turned off, the self-priming electromagnetic valve closes the gas flow passage through which gas flows to the gas inlet 8 due to loss of power supply.
It should be additionally noted that, it should be construed that the present invention is not limited to the embodiments described above but covers all possible implementation conditions determined by the claims and the disclosure of the specification. Therefore, any simple amending, equivalent change, or modification made to the embodiments without departing from the content of the technical solutions of the present invention according to the technical essence of the present invention should fall within the protection scope of the technical solutions of the present invention. It should be noted that, any inferior application based on the present invention still falls within the protection scope of the technical solutions of the present invention.
Further embodiments of the invention:

1. A gas flow control device for a gas stove, characterized by comprising: a driving device, a valve body (1), a first valve rod (2), a second valve rod (3), a first valve core (4), a second valve core (5), a first reset device (6), and a second reset device (7), wherein the valve body (1) comprises a gas inlet (8), a first gas outlet (9), and a second gas outlet (10); when the gas flow control device is in a turn-off state, the first valve core (4) is held against an inner wall of the valve body (1) under the action of the first reset device (6), to close a gas flow passage through which gas flowing from the gas inlet (8) flows to the first gas outlet (9); meanwhile, the second valve core (5) is also held against the inner wall of the valve body (1) under the action of the second reset device (7), to close a gas flow passage through which gas flowing from the gas inlet (8) flows to the second gas outlet (10); the driving device is used for directly or indirectly driving the first valve rod (2) to move, and the first valve rod (2) further drives the first valve core (4) to move, to open the gas flow passage through which gas flowing from the gas inlet (8) flows to the first gas outlet (9); and the driving device is further used for directly or indirectly driving the second valve rod (3) to move, and the second valve rod (3) further drives the second valve core (5) to move, to open the gas flow passage through which gas flowing from the gas inlet (8) flows to the second gas outlet (10).
2. The gas flow control device according to embodiment 1, 1characterized in that: the driving device is a linear motor.
3. The gas flow control device according to embodiment 1, characterized in that: the driving device comprises a motor (11) and a conversion device; and the conversion device is used for converting rotational motion of the motor (11) into linear motion, to directly drive the first valve rod (2) and/or the second valve rod (3) to make linear motion.
4. The gas flow control device according to embodiment 3, characterized in that: the motor (11) comprises a shaft rod (12); the conversion device comprises a gear wheel (13) and a gear rack (14) engaged with each other; the gear wheel (13) is connected to the shaft rod (12); and the gear rack (14) is connected to the first valve rod (2) and/or the second valve rod (3).
5. The gas flow control device according to embodiment 3, characterized in that: the motor (11) comprises a shaft rod (12); the conversion device comprises a cam (15); and the cam (15) is connected to the shaft rod (12).
6. The gas flow control device according to embodiment 5, characterized in that: a guide rail portion (16) is disposed on a side wall of the cam (15) surrounding the shaft rod (12); and a side end of the first valve rod (2) and/or the second valve rod (3) is held against a bottom wall (19) of the guide rail portion (16).
7. The gas flow control device according to embodiment 6, characterized in that: a projection of the bottom wall (19) of the guide rail portion (16) on a plane vertical to the shaft rod (12) is at least partially of a logarithmic spiral structure or a circular arc structure.
8. The gas flow control device according to embodiment 5, characterized in that the cam is an eccentric wheel.
9. The gas flow control device according to embodiment 1, characterized in that: the driving device is further used for directly or indirectly controlling a motion range of the first valve rod (2), to control an open degree of the gas flow passage through which gas flowing from the gas inlet (8) flows to the first gas outlet (9); and the driving device is further used for directly or indirectly controlling a motion range of the second valve rod (3), to control an open degree of the gas flow passage through which gas flowing from the gas inlet (8) flows to the second gas outlet (10).
10. The gas flow control device according to embodiment 1, characterized in that: the first reset device (6) comprises an elastic component and a stop portion (18), and the stop portion (18) is disposed on the inner wall of the valve body (1); and the stop portion (18) is used for stopping the elastic component.
11. The gas flow control device according to embodiment 1, characterized in that: the first valve core (4) is of a truncated cone structure, wherein the truncated cone is disposed with a tangent plane (17) parallel to an axis of the truncated cone and intersecting with a lower bottom surface and a side surface of the truncated cone.
12. The gas flow control device according to embodiment 11, characterized in that:
- the first valve rod (2) is connected and fixed to an upper bottom surface of the truncated cone, the second valve rod (3) is connected and fixed to the lower bottom surface of the truncated cone, and the first reset device (6) is held against the lower bottom surface of the truncated cone.
13. The gas flow control device according to any one of embodiments 1 to 12, characterized in that: when the first valve core (4) moves to a certain degree, the first valve core (4) drives the second valve rod (3), and the second valve rod (3) further drives the second valve core (5) to move, to open the gas flow passage through which gas flowing from the gas inlet (8) flows to the second gas outlet (10).
14. The gas flow control device according to any one of embodiments 1 to 12, characterized in that: the gas flow control device is further disposed with a third valve rod, a third valve core, and a third reset device; the valve body further comprises a third gas outlet; when the gas flow control device is in the turn-off state, the third valve core is held against the inner wall of the valve body under the action of the third reset device, to close a gas flow passage through which gas flowing from the gas inlet flows to the third gas outlet; and the driving device is used for directly or indirectly driving the third valve rod to move, and the third valve rod further drives the third valve core to move, to open the gas flow passage through which gas flowing from the gas inlet flows to the third gas outlet.
15. The gas flow control device according to any one of embodiments 1 to 12, characterized in that: the first gas outlet (9) is used for supplying gas to an inner-ring fire cover; and the second gas outlet (10) is used for supplying gas to an outer-ring fire cover.
16. The gas flow control device according to any one of embodiments 1 to 12, characterized in that: the driving device is used for directly or indirectly driving the first valve rod (2) to make linear motion, and the first valve rod (2) further drives the first valve core (4) to move, to open the gas flow passage through which gas flowing from the gas inlet (8) flows to the first gas outlet (9); and the driving device is further used for directly or indirectly driving the second valve rod (3) to make linear motion, and the second valve rod (3) further drives the second valve core (5) to move, to open the gas flow passage through which gas flowing from the gas inlet (8) flows to the second gas outlet (10).
17. The gas flow control device according to any one of embodiments 3 to 8, characterized in that: the conversion device comprises a crack slide block.
18. The gas flow control device according to any one of embodiments 3 to 8, characterized in that: the first valve rod (2) and the second valve rod (3) are connected to each other; and the conversion device is used for directly driving the first valve rod (2) and the second valve rod (3) to make linear motion together.
19. The gas flow control device according to embodiment 18, characterized in that:
- the first valve rod (2) and the second valve rod (3) are of an integral structure.
20. The gas flow control device according to any one of embodiments 3 to 8, characterized in that: the conversion device comprises a first conversion device and a second conversion device; the first conversion device is used for converting rotational motion of the motor into linear motion, to directly drive the first valve rod to make linear motion; and the second conversion device is used for converting rotational motion of the motor into linear motion, to directly drive the second valve rod to make linear motion.
21. The gas flow control device according to any one of embodiments 3 to 8, characterized in that: the conversion device comprises a screw and a nut.
22. The gas flow control device according to embodiment 1, characterized in that: the first valve rod (2) and the second valve rod (3) are connected to each other; and the driving device is used for directly driving the first valve rod (2) and the second valve rod (3) to make linear motion together.
23. The gas flow control device according to embodiment 1, characterized in that: the second valve core (5) is of a truncated cone structure or a cone structure.
24. A gas stove, disposed with the gas flow control device according to any one of the above embodiments.

Claims

A gas flow control device for a gas stove, comprising at least one gas valve (1, 4, 5) and a driving device (11, 12, 13, 14, 15, 16), the driving device (11, 12, 13, 14, 15, 16) being configured for actuating the at least one gas valve (1, 4, 5) between an open and a closed position thereof in a linear manner.
The gas flow control device of claim 1, characterized in that a first and a second gas valve (1, 4, 5) are provided, wherein the driving device (11, 12, 13, 14, 15, 16) is configured for actuating each of the gas valves (1, 4, 5) in a linear manner between an open and a closed position.
The gas flow control device of claim 2, characterized in that respective valve rods (2, 3) of the first and second gas valve (1, 4, 5) lie on the same straight line.
The gas flow control device of claim 2 or 3, characterized in that the second valve (1, 5) is configured to open only after the first valve (1, 4) has reached its open position.
The gas flow control device of claim 4, characterized in that the first valve has a first valve core (4) as well as a first and a second valve rod (2, 3) connected to the first valve core (4) on opposite sides, wherein, in the closed state of a respective gas valve (1, 4, 5), the second valve rod (3) is spaced apart from a second valve core (5) of the second valve (1, 5), and wherein the second valve rod (3) is configured to contact the second valve core (5) for actuating the second valve core (5) into its open position corresponding to the open position of the second valve (1, 5) only once the first valve core (4) has reached its open position corresponding to the open position of the first valve (1, 4).
The gas flow control device of claim 5, characterized in that first and second reset devices (6, 7) are provided for urging the first and second valve core (4, 5) into the closed position of a respective gas valve (1, 4, 5).
The gas flow control device of claim 6, characterized in that the first and/or second reset device (6, 7) is configured as a spring.
The gas flow control device of one of claims 1 - 7, characterized in that the driving device comprises a motor (11) and means (12, 13, 14, 15, 16) for converting a motor rotational motion into a linear motion for actuating the at least one gas valve (1, 4, 5) in the linear manner.
The gas flow control device of claim 8, characterized in that the means comprise a gear wheel (13) connected to a shaft (12) of the motor (11), the gear wheel (13) meshing with a gear rack (14).
The gas flow control device of claim 9, characterized in that the gear rack (14) is connected to the first valve shaft (2).
The gas flow control device of claim 10, characterized in that the gear rack (14) is formed integrally with the first valve shaft (2).
The gas flow control device of claim 8, characterized in that the means comprise a cam (15) connected to a shaft (12) of the motor (11).
The gas flow control device of claim 12, characterized in that the cam (15) is configured to directly acutate the first valve shaft (2).
The gas flow control device of claim 13, characterized in that the cam (15) has a groove (16) for guiding the first valve chaft (2) and/or the groove (16) has a spiral shape.
Gas stove, in particular household gas stove, comprising a gas flow control device of one of claims 1 - 14.