CN1049726C - gas stove - Google Patents

Abstract

A gas stove has an inner burner and an outer burner, a gas valve for controlling the gas supply of the burners, and a control knob for operating the gas valve; two thermocouples respectively arranged adjacent to the burner detect whether flame exists in the burner, and when the corresponding thermocouples detect the flame-free state of the main burner, the gas valve is closed accordingly.

Description

gas stove

The invention relates to a gas stove with the function of automatically cutting off gas supply.

CN 2036246U discloses a gas stove safety device, which has electronic ignition, timing, and sound alarm, and is used for gas valve and alarm electromagnetic switch control, flame monitoring and other functions. The structures are connected with circuits.

Although this safety device can play a certain effect on the safety of the gas range, it still has defects such as unreasonable structure and low efficiency.

The object of the present invention is to provide a safe and reliable gas stove.

The invention proposes a gas furnace, which has two burners, a gas valve for controlling the supply of gas to the burners, a control knob for manipulating the gas valve, and two thermocouples respectively arranged adjacent to the burners. There is no flame in the burner, and the arrangement of the gas furnace is such that when one or two corresponding thermocouples detect the absence of flame in one or both burners and respond accordingly, the gas valve is closed.

The gas valve preferably has a valve seat, and a valve member that is in contact with the valve seat by a spring bias, whereby the gas valve is closed, and the electromagnet can be energized by the thermocouple, resisting the action of the spring, and the gas valve is opened. .

An ideal arrangement for a gas furnace, where the gas valve only closes in response to the absence of flame on both burners.

In an ideal embodiment, the gas furnace has another gas valve, each of which is set to control the gas supply of the corresponding burner, and is connected with a corresponding thermocouple so that each gas valve can Each independently closes in response to the corresponding thermocouple detecting the flameless condition of the corresponding burner, independently of the other gas valves.

It is more advantageous to operate both gas valves with the same control knob.

Preferably the gas furnace also has an auxiliary gas valve located in a gas supply line in the burner for closing the gas furnace.

Preferably the auxiliary gas valve has a manipulation button.

When the control button is manually returned to the non-working state, the control button is automatically returned to the non-working state. The non-working state of the two is equivalent to cutting off the gas supply, and this arrangement is the most favorable.

In another preferred embodiment of a gas furnace, the gas valve closes in response to the absence of flame from one or both of the burners intended for use.

In another desirable embodiment, the gas oven further includes a device for automatically adjusting the tension of the gas valve spring when the control knob is manually operated, the electromagnet and a Or two thermocouples to keep the gas valve open, and only one thermocouple to keep the valve open when two burners are intended to be used, without a solenoid valve.

Preferably the gas valve comprises an operating shaft rotated by a control knob and a coil spring concentrically sleeved on the shaft. The gas valve is biased to the closed position, the stop can only move axially, but not rotate, so when the shaft is rotated, the tension of the spring is automatically adjusted due to the changing distance between the stop and the abutment .

In another desirable embodiment, the gas oven further comprises a regulating device for automatically regulating the current generated by one or both thermocouples when the control knob is manually manipulated, when the corresponding one or two burners are intended to be used When two burners are intended to be used, only one thermocouple keeps the valve open and no electromagnet is used.

Preferably the device has two variable resistance elements connected in series in the corresponding thermocouple circuit. When the gas furnace is switched to one or two groups of burners, the resistance element can be automatically adjusted to a low resistance value or a high resistance value by manually operating the control knob.

Preferably the thermocouples are of substantially the same rating, the resistive members are adjustable to substantially the same resistance value, and each resistor is adjustable between a specific resistance value and half that resistance value.

Preferably the gas furnace further includes a time delay element in each thermocouple circuit to slow down the de-excitation rate of the corresponding thermocouple after the corresponding burner is turned off.

The present invention is described in more detail with reference to the accompanying drawings by way of example only below, and the accompanying drawings are as follows:

Fig. 1 is a partial cross-sectional schematic diagram of a first embodiment of a gas stove according to the present invention;

Fig. 2 is a partial cross-sectional schematic diagram of a second embodiment of a gas stove according to the present invention;

Fig. 3 is a partial cross-sectional schematic diagram of a third embodiment of a gas stove according to the present invention;

4A to 4C show different working positions of the gas furnace gas valve in FIG. 3;

5A to 5B are partial cross-sectional schematic diagrams of the gas valve of the gas furnace in FIG. 3;

Fig. 6 is a partial cross-sectional schematic view of a fourth embodiment of a gas stove according to the present invention.

Referring to accompanying drawing Fig. 1, the first embodiment of the gas stove 10 of the present invention is shown among the figure, comprise inner burner 11, the outer burner 12 that annular surrounds inner burner 11, and support is seated on gas stove 10 and is heated Top parts 13 such as pots and the like. The fuel gas is supplied via the gas valve 14, the gas chamber 15 and the pipes 16 and 17 leading to the respective burners 11 and 12. The gas valve 14 is electromagnetically controlled by a pair of thermocouples 18 and 19 adjacent to the respective burners 11 and 12 .

The gas valve 14 has a casing 20, and the casing has a gas inlet 21 and an outlet 22, and the casing 20 communicates with the gas chamber 15 through the outlet 22. The outlet 22 is provided with a fixed valve seat 2 , and the valve element 24 is installed on the valve control shaft 25 . The distal end of the shaft 25 is connected to a control knob 26 by which the gas valve 14 is operated by the user. The proximal end of the shaft 25 is within the housing 20, on which a soft iron (ferromagnetic) member 27 is mounted. The electromagnet 28 is behind the soft iron part 27 in the shell 20, and the coil connected in parallel with the thermocouples 18 and 19 is wound on the electromagnet.

The coil spring 29 that is arranged concentrically with the shaft 25 on the shaft 25, between the valve element 24 and the platform 30 fixed on the shaft 25, presses the valve element 24 tightly on the valve seat 23, and the gas valve 14 is biased to Disabled. The gas valve 14 is then normally closed, but is held open by the electromagnetic attraction between the electromagnet 28 and the soft iron member 27 . When any one of the thermocouples 18 and 19 was heated by the fire of the corresponding burner 11 or 12, the electromagnet 28 and the soft iron part 27 pulled the valve element from the valve seat 23 through the shaft 25.

The gas oven 10 also has an auxiliary gas valve 31 located in the gas supply line of the burner 12 in the gas chamber 15 . The auxiliary gas valve 31 has a fixed valve seat 32 and a valve element 33 associated therewith, which can be moved by means of a button 34 via an actuating shaft 35 . There is a spring (not shown) inside the button 34 to push the shaft 35 outwards to keep the auxiliary gas valve 31 in a constant open state. When the external burner 12 is extinguished, the user presses the button 34 to close the auxiliary gas valve 31 . The button 34 keeps the gas valve 31 in the closed position until the control knob 26 is turned back to the original inactive position and the gas valve 31 is released.

When using the gas stove 10, the user first presses the control button 26 to open the gas valve 14, and then immediately rotates the control button 26 clockwise to ignite the burners 11 and 12. Although not shown, ignition can be accomplished by piezoelectric igniters commonly known in the art. Typically, the control button 26 must be kept pressed for a second or two until the thermocouples 18 and 19 generate sufficient current to excite the electromagnet 28 to hold the soft iron 27 and keep the gas valve 14 open.

The distance between the valve element 24 and the valve seat 23 determines the flow rate of the supplied gas, and determines the size of the flames of the burners 11 and 12. This distance can be adjusted by the user by turning the control knob 26 counterclockwise for decrement and clockwise in the subsequent stages for increment. The gas furnace is designed such that in any case, when the distance is the smallest or the largest, the fires of the burners 11 and 12 are correspondingly the smallest or the largest, and the thermocouples 18 and 19 are heated to a sufficient temperature during operation to ensure that the valve element 24 leaves the valve seat 23 to keep the gas valve 14 in an open state.

It will be understood that when the two burners 11 and 12 intended to be used with the gas furnace 10 are accidentally extinguished, for example by wind or liquids above the gas furnace 10 blown out or splashed out, the thermocouples 17 and 18 are no longer heated. Cause the electromagnetic attraction force between the electromagnet 28 of gas valve 14 and the soft iron part 27 to disappear like this. As a result, the gas valve 14 returns to the closed position under the action of the bias spring 29, thereby cutting off the supply of gas for safety. The same happens when only the inner burner 11 is used, the outer burner 12 is turned off intentionally with the button 34 and the inner burner goes out accidentally.

For example, when a pot is placed on the top part 13 of the gas stove 10, it is unlikely that one (but not both) of the intended burners 11 and 12 will go out accidentally, because the burner under the pot In a confined space, a burner 11 or 12 that is extinguished is almost certainly re-ignited by another burner 12 or 11 that is still burning.

Figure 2 shows a second embodiment of a gas burner 36 of the present invention modified to provide an independent gas supply shutoff function associated with each burner. The structure of the gas furnace 36 is similar to the structure of the gas furnace 10, and (unless otherwise specified) the same parts are represented by the same figure numbers, but the gas supply of the burners 12 and 11 is controlled respectively with two gas valves 14 and 14 '. Gas valve 14 is the same as 14 ′, only gas valve 14 ′ is smaller than gas valve 14 . The design of the air inlet 21' of the gas valve 14' is not suitable for direct connection with external gas supply, but is indirectly supplied through the casing 20 of the gas valve 14, as shown in the figure.

Thermocouples 18 and 19 are connected to gas valves 14' and 14, respectively, so that each thermocouple detects the presence or absence of flame in the associated burner 11 or 12, respectively. It should be understood that the rating of each thermocouple 18 or 19 is correlated with the strength of the bias spring of the corresponding gas valve 14' or 14, so that the electromagnetic force generated by each thermocouple through the corresponding electromagnet is sufficient to overcome the corresponding bias spring reaction force.

During work, when the intended burner or each burner 11 or 12 goes out accidentally, no matter what the state of another burner 12 or 11 is, the gas supply will be cut off automatically to ensure safety.

Figure 3 shows a third embodiment of a gas burner 37 according to the invention which uses only a single gas valve 38, although no pan is placed on the burner 37 and only one of the two burners intended to be used is extinguished , it still has the function of automatically cutting off the gas supply.

The structure of the gas stove 37 is similar to the gas stove 10, and the same parts (unless otherwise specified) are represented by the same figure numbers, only the gas valve 38 and the gas supply cavity 39 are improved. The cavity 39 is divided into two upper sub-chambers 40 and 41, which supply gas to the burners 11 and 12, respectively. The gas valve 38 has a housing 42, the housing 42 has an outlet 43, divided into two side holes 44 and 45, communicating with the corresponding compartments 40 and 41.

The gas valve 38 has a valve element 46 fixed on a valve actuating shaft 48 and a valve seat 47 in the form of a plate with two holes 50 and 51 . A valve seat 47 is behind the outlet 43 , remains last in contact with the outlet 43 , and is rotatable by a shaft 48 .

Referring to Figures 4A to 4C, the holes 50 and 51 of the valve seat plate 47 are arranged to align sequentially with the corresponding outlet holes 44 and 45, as shown. Engagement of valve element 46 with valve seat plate 47 closes gas valve 38 regardless of the adjustment of holes 44, 45, 50 and 51.

The gas valve 38 has a platform part 52 in addition, surrounds the shaft 48 behind the valve element 46, and the coil spring 53 is coaxially arranged on the shaft 48, and cooperates between the platform part 52 and the valve element 46 to make the valve element 46 Pressed to contact with the valve seat 47, the gas valve 38 is closed. The platform part 52 has an annular support 54 fixed in the gas valve casing 42, and a nut 55 is supported in the annular support 54, which can slide but not rotate. The nut 55 is threaded on the threaded portion of the shaft 48 so that when the shaft 48 rotates, the nut 55 can move relative to the shaft 48 in one direction or in the opposite direction.

The operation of the gas valve 38 will now be described with reference to FIGS. 5A and 5B. When the two burners 11 and 12 are ignited, the control knob 26 drives the shaft 48 to rotate clockwise until the holes 50 and 51 of the valve seat plate 49 are aligned with the holes 44 and 45 of the outlet 43 (Figure 4C), so that the gas is pressed The maximum flow rate is supplied to burners 11 and 12 while ignition is performed by a piezoelectric igniter (not shown) associated with control knob 26 . This light-off state is shown in FIG. 5A. At this time, the nut 55 is in the position closest to the valve element 46 in the annular support 54, so the spring 53 is in the maximum tension working state. On the other hand, the thermocouples 18 and 19 are all heated, and the generated operating current generates the maximum electromagnetic force through the electromagnet, which is enough to overcome the active force of the spring 53 and keep the valve element 46 away from the valve seat plate 47. The ratings of the thermocouples 18 and 19 are that under the above conditions, two thermocouples 18 and 19 are required to overcome the force of the spring 53. When one of the burners 11 and 12 goes out unexpectedly, only one thermocouple is not enough to overcome the force of the spring 53. The force of the spring 53.

When closing the outer burner 12, turn the control knob 26 counterclockwise, and the relative position of the valve element 46 and the valve seat plate 47 is shown in Figure 4B. At this time, the holes 50 and 44 are still aligned, and the holes 51 and 45 are misaligned. , thus cutting off the gas supply to the outer burner 12. In this case, as shown in FIG. 5B , the nut 55 is in the working position furthest from the valve element in the annular support 54 , so that the spring 53 is in the working state of the lowest tension. This minimum tension force is very small, and can be overcome by the electromagnetic force produced by the electromagnet 28 and the thermocouple 18 of the internal burner 11, thereby maintaining the gas supply to the internal burner 11. Therefore if at any time when the internal burner 11 goes out accidentally, the gas valve 38 automatically cuts off the gas supply of the internal burner 11 under the effect of the spring 53 .

As an alternative to automatic adjustment of gas valve spring tension, the same function can be achieved by automatically adjusting the operating current of the thermocouple according to the operating state of the gas furnace, ie if one or two burners are being used.

The fourth embodiment of the gas stove 56 of the present invention is shown in Figure 6, similar to the gas stove 37, the same parts are represented by the same figure number (unless otherwise specified), only the tension of the gas valve spring 53 can not be automatically adjusted. In addition, a variable resistance element 57 is connected in series with the thermocouples 18 and 19 in the circuit. The manipulating member 58 of the resistor 57 is mechanically connected with the control knob 26 by a known method, so that when the control knob 26 is rotated, the manipulator 58 is automatically changed, and the resistance value of the resistor 57 is adjusted accordingly. In this particular arrangement, where there are two galvanic couples of substantially the same rating, the resistive element 57 is designed to switch between a specific resistance value (high value) and half that resistance value (low value).

When using the burners 11 and 12 at the same time, the resistor 57 is set to a high resistance value; when only one of the burners 11 or 12 is used, it is adjusted to a low resistance value. It should be understood that in any of the above-mentioned working states of the gas furnace 56 , the value of the generated current passing through the electromagnet 28 in the gas valve 14 is substantially constant, and its value is sufficient to overcome the biasing force of the gas valve spring 53 .

It should be understood that the same current control measures could be used on the gas furnace 10 to enable the automatic gas shutoff system to determine when only one burner is intended, or when two burners are intended and one of them goes out for any reason. To this end, the resistor is mechanically connected to the button 34 .

It should also be understood that resistive element 57 may be replaced by an equivalent device such as a transistor circuit.

The gas stoves 36, 37 and 56 are safer than the gas stove 10 because, for example, when there is no pan on the gas stove 36 and only one of the burners 11 and 12 is accidentally extinguished, the gas supply cut-off function is automatically performed. Whether the function of automatic gas cut-off is realized or not depends on the cut-off speed relative to the re-ignition speed in the case of a cooker placed on the gas hob 36, 37 or 56 and only one of the burners 11 and 12 goes out accidentally. Response speed of gas function. In order to maintain or restore the original flame state, delay elements such as sensors can be connected in series in the thermocouple circuit or each thermocouple circuit to reduce the response speed of the automatic gas supply cut-off function, for example, delay for half a second .

It should be understood that those skilled in the art can make modifications and/or changes to the above solutions without departing from the scope of the invention defined in the claims below.

Claims (16)

1. gas furnace device, comprise two burners, the gas valve of combustion gas is supplied with in a control to burner, a control knob of handling gas valve, with two respectively with the thermocouple of the adjacent setting of burner, detect burner and have or not flame, it is provided with the corresponding thermocouple of response and detects the no flame status of one or two burner and gas valve is closed, it is characterized in that, described burner is inside and outside burner, described gas furnace device comprises one second gas valve, and this gas valve is by the control knob control identical with control first gas valve; Each gas valve is arranged to control the fuel gas supply of corresponding burner, and related with corresponding this thermocouple, thereby each gas valve responds the no flame status of the detected related burner of corresponding thermocouple and respectively each gas valve closed.

2. gas furnace as claimed in claim 1, it is characterized in that gas valve has a valve seat and a valve element, the valve element is by a spring bias voltage, make it to contact with valve seat, gas valve is closed, or overcome the effect of spring by the electromagnet of this thermocouple excitation, make the valve element be separated from valve seat, thereby open gas valve.

3. gas furnace device as claimed in claim 1 or 2 is characterized in that in the device, and gas valve only responds two all aphlogistic states of burner and gas valve is closed.

4. gas furnace device as claimed in claim 3 is characterized in that device also comprises an assisted gas valve, is located in the fuel gas supply pipeline of one of them burner, is used to make this burner to extinguish.

5. gas furnace device as claimed in claim 4 is characterized in that the assisted gas valve has a control button.

6. gas furnace device as claimed in claim 5 is characterized in that device is provided with button, and when control knob was manually fallen back on off position, button just fell back on off position automatically, and two off positions all are equivalent to cut off fuel gas supply.

7. gas furnace device as claimed in claim 1 is characterized in that device also is provided with an assisted gas valve, is located in the fuel gas supply pipeline of one of them burner, is used to make this burner to extinguish.

8. gas furnace device as claimed in claim 7 is characterized in that this assisted gas valve has a control button.

9. gas furnace device as claimed in claim 8 is characterized in that device also is provided with button, and when control knob was manually fallen back on off position, button just fell back on off position automatically, and two off positions all are equivalent to cut off fuel gas supply.

10. gas furnace device as claimed in claim 1 or 2 is characterized in that it being gas valve in the device, the no flame status of predetermined two burners that use of response or one of them burner and gas valve is closed.

11. gas furnace device as claimed in claim 10, it is characterized in that gas furnace also comprises when the manual control control knob, automatically regulate the device of the rate of tension of gas valve spring, thereby when predetermined when using corresponding one or two burner, available electromagnet and one or two thermocouple keep gas valve to open, but during two burners of predetermined use, then only keep gas valve to open with a thermocouple without electromagnet.

12. gas furnace as claimed in claim 11, it is characterized in that gas valve comprises a control lever shaft that can be rotated by control knob, spring is a disc spring, is provided with axle is concentric on axle, and this device has a retainer, spring is placed on the acting in conjunction between the platform of leaning on retainer and the axle, gas valve is pressed onto on the closed position, when rotation axle retainer can move axially and can not rotate, therefore when axle rotates, because retainer and the variable in distance of leaning on interstation, the just rate of tension of automatic adjuster spring.

13. gas furnace as claimed in claim 10, it is characterized in that comprising: the device of when with the hand operated control knob, regulating the electric current of one or two thermocouple generation automatically, thereby when predetermined when using corresponding one or two burner, can keep gas valve to be in opening by electromagnet and one or two thermocouple, during two burners of predetermined use, then only use a thermocouple without electromagnet.

14. gas furnace as claimed in claim 13, it is characterized in that this device has two variable resistor spares, it is connected in series in corresponding thermocouple circuit, when gas furnace is switched to one or two burner, use the hand operated control knob, just this resistance unit can be adjusted to low-resistance value or high resistance automatically respectively.

15. gas furnace as claimed in claim 14 is characterized in that two thermocouples have essentially identical rated value, resistance unit can be handled, and reaches essentially identical resistance value, and each resistance unit can be regulated between half in specific resistance and this resistance.

16. gas furnace as claimed in claim 1 or 2 is characterized in that also comprising a delay cell that connects in each thermocouple circuit, when corresponding burner extinguished, speed was encouraged in the mistake of lowering corresponding thermocouple.

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