CN215831916U - Safety circuit for a gas burner and household appliance - Google Patents
Safety circuit for a gas burner and household appliance Download PDFInfo
- Publication number
- CN215831916U CN215831916U CN202122223675.0U CN202122223675U CN215831916U CN 215831916 U CN215831916 U CN 215831916U CN 202122223675 U CN202122223675 U CN 202122223675U CN 215831916 U CN215831916 U CN 215831916U
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- CN
- China
- Prior art keywords
- switching element
- gas
- gas burner
- safety circuit
- gas valve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/12—Arrangement or mounting of control or safety devices
- F24C3/126—Arrangement or mounting of control or safety devices on ranges
Abstract
The utility model relates to a safety circuit for a gas burner supplied with gas via a gas valve, the solenoid coil of the gas valve being supplied with sufficient energy by the thermocouple to keep the gas valve open when the temperature on the thermocouple in the vicinity of the gas burner exceeds a predetermined limit value, the safety circuit having: a series circuit formed by a thermocouple and an electromagnetic coil of the air valve; and an electronic current flow blocking device for blocking a current flow from the thermocouple through the solenoid of the gas valve, the current flow blocking device having a series circuit formed by a first switching element and a second switching element and having a control section by which switching states of the first switching element and the second switching element can be controlled and monitored independently of each other. Furthermore, the utility model relates to a household appliance. The safety circuit for a gas burner of the present invention has the following advantages: which can improve the operational safety of the gas burner.
Description
Technical Field
The utility model relates to a safety circuit for a gas burner, in particular for a gas burner of a gas cooking hob of a gas cooker. Furthermore, the utility model relates to a household appliance.
Background
The gas burner is usually supplied with gas from a gas supply line through a gas valve. Furthermore, thermocouples are often positioned in the vicinity of the gas burner, which generate electrical energy from heat by the thermoelectric effect and are therefore suitable for temperature measurement. However, it is also possible that the thermocouple is used to supply energy to the solenoid of the gas valve in order to keep the gas valve open when the gas burner generates a sufficient temperature at the thermocouple, as is described, for example, in EP 3534069 a 1.
In addition to controlling the gas valve for supplying the gas burner with gas, depending on the application, safety measures are often required in order to block the gas supply, for example in the event of a malfunction in the system of the gas burner. In conventional systems, such safety measures are usually implemented by mechanical means, but there is always a need for electronic safety measures, for example, due to electronic operating devices and electronically actuated gas valves.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is therefore to provide an electronic safety device for a gas burner with a gas valve actuated by means of a thermocouple.
This object is achieved by the safety circuit according to the utility model.
According to the utility model, a safety circuit for a gas burner is proposed, to which gas is supplied via a gas valve, wherein, when the temperature on a thermocouple in the vicinity of the gas burner exceeds a predetermined limit value, a solenoid coil of the gas valve is supplied with sufficient energy by the thermocouple to keep the gas valve open. According to the utility model, the safety circuit has, in addition to the series circuit formed by the thermocouple and the solenoid of the gas valve, an electronic current flow blocking device for blocking the flow of current from the thermocouple through the solenoid of the gas valve. The electronic current flow blocking device has a series circuit formed by a first switching element and a second switching element, and a control unit, wherein the switching states of the first switching element and the second switching element can be controlled and monitored independently of one another by the control unit.
The use of an electronic current flow blocking device enables simple and reliable safety measures for the system of the gas burner. By using a series circuit of two switching elements whose switching states can be controlled and monitored independently of one another by the control unit, a reliable functionality of the safety circuit can be ensured and the operating mode of the current flow blocking device itself can also be reliably monitored, as a result of which the operating safety of the gas burner can be increased.
Within the scope of the utility model, the safety circuit may comprise one or more thermocouples for supplying current to the solenoid of the gas valve and/or comprise a series circuit formed by two or more switching elements. As the first and second switching elements, field effect transistors (MOSFETs) are preferably used, preferably low-ohmic field effect transistors. Preferably, the switching elements of the current flow blocking means are identical, but in principle different switching elements may also be used. The control unit is designed, for example, as a microcontroller.
In a first embodiment variant of the utility model, the series circuit formed by the first switching element and the second switching element is connected in series with the solenoid coil of the gas valve. In this case, the current flow through the solenoid of the gas valve can be blocked by opening at least one switching element or preferably all switching elements.
In a second embodiment variant of the utility model, the series circuit formed by the first switching element and the second switching element is connected in parallel with the solenoid coil of the gas valve. In this case, the current flow through the solenoid of the gas valve can be blocked by closing the two switching elements.
In an embodiment of the utility model, the control section of the current flow blocking device has a first control output for actuating the first switching element and a second control output for actuating the second switching element. The use of two separate control outputs for the two switching elements facilitates the actuation of the switching elements independently of each other.
In an embodiment of the present invention, the control section has a voltage level input terminal connected to a connection point between the first switching element and the second switching element, and the control section is configured to detect a voltage level between the first switching element and the second switching element to monitor a switching state of the first switching element and the second switching element based on the detected voltage level. Preferably, the control section further has an analog-to-digital converter, and the voltage level input terminal of the control section is connected to the analog-to-digital converter. Preferably, the connection point between the first switching element and the second switching element is also coupled to the network voltage via a resistor. This embodiment of the utility model on the one hand enables a reliable monitoring of the switching state of the switching element and on the other hand achieves this by means of a relatively uncomplicated method, so that for example simple class B software is sufficient.
In an embodiment of the utility model, the control unit has at least one processor, wherein the at least one processor is configured to control and monitor the switching states of the first switching element and the second switching element independently of one another.
In an embodiment of the utility model, the control unit has at least one processor and at least one memory, wherein the memory comprises software, preferably of the type B, which, when executed by the at least one processor, causes the at least one processor to control and monitor the switching states of the first and second switching elements independently of one another.
The above-described safety circuit of the utility model can in principle be used with any gas burner. The safety circuit according to the utility model can be advantageously applied in a household appliance, for example a gas cooking range or hob with one or more gas burners.
The utility model further relates to a household appliance having a gas burner which is supplied with gas via a gas valve, wherein a solenoid coil of the gas valve is supplied with sufficient energy by the thermocouple to keep the gas valve open when the temperature at the thermocouple in the vicinity of the gas burner exceeds a predetermined limit value, wherein the household appliance has the above-described safety circuit for the gas burner.
Drawings
The above and further features and advantages of the utility model will be better understood from the following description of a preferred, non-limiting embodiment with the aid of the accompanying drawings. Here, it is shown largely schematically:
fig. 1 shows a block diagram of a safety circuit according to a first embodiment of the utility model; and
fig. 2 shows a block diagram of a safety circuit according to a second embodiment of the utility model.
Detailed Description
A safety circuit according to a first embodiment of the utility model is exemplarily illustrated in fig. 1.
The safety circuit 10 is used for a gas burner 12, which is supplied with gas from a gas supply line 14 via a gas valve 16. The gas valve 16 is constructed in the form of a solenoid valve having a solenoid 18 for actuating a valve element to open and close a passage. Furthermore, a thermocouple 20 is arranged in the vicinity of the gas burner 12. After the operation of the gas burner 12 is started, the thermocouple 20 is exposed to a high temperature, and thus generates electric energy due to the thermoelectric effect. The solenoid coil 18 of the gas valve 16 is electrically conductively connected to the thermocouple 20, so that, when the temperature generated by the gas burner 12 is sufficiently high at the thermocouple 20, the thermocouple 20 supplies current to the solenoid coil, in particular sufficient current, in order to keep the gas valve 16 open.
In addition to this series circuit of the thermocouple 20 and the solenoid coil 18 of the gas valve 16, the safety circuit 10 also contains a current flow blocking device which blocks the flow of current from the thermocouple 20 through the solenoid coil 18 when required in order to close the gas valve 16, for example as a safety measure due to any functional failure in the gas burner system. The current flow blocking device comprises in particular a series circuit of a first switching element 31, preferably in the form of a low-ohmic field effect transistor, and a second switching element 32, also preferably in the form of a low-ohmic field effect transistor. In the exemplary embodiment of fig. 1, this series circuit of the first switching element 31 and the second switching element 32 is connected in series with the electromagnetic coil 18, so that by opening one, preferably both, switching elements the current flow from the thermocouple 20 through the electromagnetic coil 18 can be blocked.
As shown in fig. 1, the current flow blocking device furthermore has a control 34, for example in the form of a microcontroller. The control section 34 includes one or more processors 35 and a memory 36. The memory 36 preferably contains class B software which, when executed by the processor 35, causes the switching states of the first switching element 31 and the second switching element 32 to be controlled and monitored. The control unit 34 further includes an analog-to-digital converter 37.
The control part 34 has a first control output 38 connected to the processor 35 and the first switching element 31 for operating the first switching element 31 to open or close, and has a second control output 39 connected to the processor 35 and the second switching element 32 for operating the second switching element 32 to open or close. The first switching element 31 and the second switching element 32 can thus be actuated independently of one another by the control 34.
Furthermore, a voltage level input 41 is provided on the control unit 34, which is connected on the one hand to the analog-digital converter 37 and on the other hand to a connection point 40 between the first switching element 31 and the second switching element 32. Furthermore, a connection point 40 between the first switching element 31 and the second switching element 32 is coupled to the network voltage VCC via a resistor 42. By measuring the voltage level between the first switching element 31 and the second switching element 32, the control section 34 can monitor the switching states of the first switching element 31 and the second switching element 32 independently of each other in a simple manner in such a way that: different switching state combinations of the first switching element 31 and the second switching element 32 are generated by the first control output 38 and the second control output 39 and the respective voltage levels are then checked. Since any functional failure in the components of the current flow blocking device causes a change in the voltage level, the faulty behavior of the current flow blocking device can be recognized in a simple manner, in which case the closing of the gas valve and/or the output of an alarm signal is then carried out for safety.
A safety circuit according to a second embodiment of the utility model is exemplarily illustrated in fig. 2. Here, the same or similar components are denoted by the same reference numerals.
The safety circuit 10 of the second embodiment differs from that of the first embodiment in the configuration of the current flow blocking means. As shown in fig. 2, the series circuit of the two switching elements is connected in parallel with the solenoid coil 18 of the gas valve 16, so that the current flow of the thermocouple 20 can bypass the solenoid coil 18 by closing the first switching element 31 and the second switching element 32. In order to achieve this short-circuit effect, the first switching element 31 and the second switching element 32 are preferably designed as low-ohmic field effect transistors.
Otherwise, the structure and operation of the current flow blocking device and the safety circuit are generally the same as those of the first embodiment.
List of reference numerals
10. a safety circuit for a safety circuit,
12 a gas burner for a gas to be burnt,
14 a gas supply line for supplying a gas to the reaction chamber,
a 16-air valve is arranged on the upper portion of the air valve,
18 of the electromagnetic coils,
20 of the number of thermocouples was measured,
31 a first switching element is provided which is,
32 a second switching element for the second switching element,
34 a control part for controlling the operation of the motor,
35 a processor for the processing of the received signal,
36 of the memory of the computer system, and a computer system,
37 a/d converter for converting the analog signal into digital signal,
a first control output 38 for controlling the operation of the motor,
39 on the second control output side of the first control circuit,
40 the connection points of the two-way connection,
41 at the input end of the voltage level,
the resistance of the resistor 42 is 42, and the resistance,
VCC network voltage.
Claims (10)
1. A safety circuit for a gas burner supplied with gas through a gas valve (16), characterized in that a solenoid (18) of the gas valve (16) is supplied with sufficient energy by a thermocouple (20) to keep the gas valve (16) open when the temperature on the thermocouple (20) in the vicinity of the gas burner (12) exceeds a predetermined limit value, wherein the safety circuit (10) has:
a series circuit formed by a thermocouple (20) and an electromagnetic coil (18) of the gas valve (16); and
an electronic current flow blocking device for blocking the flow of current from the thermocouple (20) through the solenoid (18) of the gas valve (16),
wherein the current flow blocking device has a series circuit formed by a first switching element (31) and a second switching element (32) and has a control unit (34), wherein the switching states of the first switching element (31) and the second switching element (32) can be controlled and monitored independently of one another by the control unit (34).
2. Safety circuit for gas burner according to claim 1, characterized in that the series circuit formed by the first switching element (31) and the second switching element (32) is connected in series with the solenoid (18) of the gas valve (16) and the current flow through the solenoid (18) of the gas valve (16) can be blocked by opening at least one of the first switching element (31) and the second switching element (32).
3. Safety circuit for gas burner according to claim 1, characterized in that the series circuit formed by the first switching element (31) and the second switching element (32) is connected in parallel with the solenoid coil (18) of the gas valve (16) and the current flow through the solenoid coil (18) of the gas valve (16) can be blocked by closing the first switching element (31) and the second switching element (32).
4. A safety circuit for a gas burner according to any one of claims 1 to 3, characterized in that the control portion (34) has a first control output (38) for operating the first switching element (31) and a second control output (39) for operating the second switching element (32).
5. A safety circuit for a gas burner according to any one of claims 1 to 3, characterized in that the control portion (34) has a voltage level input (41) connected to a connection point (40) between the first switching element (31) and the second switching element (32), and the control portion (34) is configured to detect a voltage level between the first switching element (31) and the second switching element (32) in order to monitor the switching state of the first switching element (31) and the second switching element (32) based on the detected voltage level.
6. Safety circuit for gas burners, according to claim 5, characterised in that said control portion (34) has an analog-to-digital converter (37) and in that the voltage level input (41) of said control portion (34) is connected to said analog-to-digital converter (37).
7. A safety circuit for a gas burner according to claim 5, characterized in that the connection point (40) between the first switching element (31) and the second switching element (32) is also coupled to the network Voltage (VCC) via a resistor (42).
8. A safety circuit for a gas burner according to any one of claims 1 to 3, characterized in that the first switching element (31) and the second switching element (32) are field effect transistors.
9. A safety circuit for a gas burner according to any one of claims 1 to 3, characterized in that the control section (34) has at least one processor (35), wherein the at least one processor (35) is configured for operating and monitoring the switching state of the first switching element (31) and the second switching element (32) independently of one another.
10. Household appliance having a gas burner (12) supplied with gas through a gas valve (16), wherein a solenoid coil (18) of the gas valve (16) is supplied with sufficient energy by the thermocouple (20) to keep the gas valve (16) open when the temperature on the thermocouple (20) in the vicinity of the gas burner (12) exceeds a predetermined limit value, characterized in that the household appliance has a safety circuit for a gas burner according to any one of claims 1 to 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020124485.1 | 2020-09-21 | ||
| DE102020124485.1A DE102020124485A1 (en) | 2020-09-21 | 2020-09-21 | Safety circuit for a gas burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215831916U true CN215831916U (en) | 2022-02-15 |
Family
ID=80199639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122223675.0U Active CN215831916U (en) | 2020-09-21 | 2021-09-14 | Safety circuit for a gas burner and household appliance |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN215831916U (en) |
| DE (1) | DE102020124485A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT89066B (en) | 1921-01-24 | 1922-07-25 | Zimmermann Fa G | Furniture lock. |
| US6959876B2 (en) | 2003-04-25 | 2005-11-01 | Honeywell International Inc. | Method and apparatus for safety switch |
| PL3534069T3 (en) | 2018-03-01 | 2021-01-11 | Copreci, S.Coop. | Flame monitoring system for a burner of a gas appliance, and control method for a gas appliance |
-
2020
- 2020-09-21 DE DE102020124485.1A patent/DE102020124485A1/en active Pending
-
2021
- 2021-09-14 CN CN202122223675.0U patent/CN215831916U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020124485A1 (en) | 2022-03-24 |
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