A gas stove with automatic gas shut-off function

Abstract

This utility model discloses a gas stove with an automatic gas shut-off function, including a gas stove body. The gas stove body includes a controller with a timing function, an inner flame ring, a first thermocouple located at the flame of the inner flame ring and connected to the controller, an outer flame ring, and a gas supply mechanism controlled by the controller to supply gas to the two flame rings. A vertically downward extending mounting cylinder is provided in the center of the inner flame ring, and a pressure detection device and a temperature sensing device are installed inside the mounting cylinder. This application sets the mounting cylinder inside the inner flame ring and installs a second thermocouple that is supported by a spring and can be raised and lowered. A pressure sensor is also installed at the bottom of the spring. By sensing changes in spring pressure and cooperating with the controller with the timing function, the system accurately judges the placement, tossing, and removal of the cookware, providing an intelligent gas shut-off protection scheme and improving the safety of the gas stove.

Description

Technical Field

[0001] This utility model relates to gas stoves, and more particularly to a gas stove with an automatic gas shut-off function. Background Technology

[0002] A gas stove is a common kitchen appliance that converts the chemical energy of gaseous fuels such as liquefied petroleum gas (LPG), manufactured gas, or natural gas into heat energy, cooking food through direct flame heating. Its working principle is based on the combustion of gas to produce a high-temperature flame, thereby heating the food in the cookware. A gas stove typically consists of several key components, including a gas supply system, a combustion system, a control unit, and a casing.

[0003] To improve the intelligence and safety of gas stoves, some gas stoves are equipped with anti-dry-burning functions. For example, the patent application number CN201810080913.7 discloses an anti-dry-burning gas stove, which describes that "a temperature sensing device is set at the center of the burner head. The temperature sensing device includes a pressure cap, a base and a spring. The pressure cap is hollow and sleeved on the base. The spring supports the pressure cap between the pressure cap and the base. A thermocouple is set inside the pressure cap. The pressure cap and the base have a free reciprocating stroke of more than 10 mm."

[0004] Currently, automatic gas shut-off systems all use this type of structure. The principle is to use two probes to detect the flame temperature and the temperature of the pot bottom, respectively. When the flame temperature is present, the solenoid valve remains open. The pot bottom temperature is determined by the cooking temperature curve (temperature rises sharply) to determine whether dry burning has occurred. However, this mechanism has a problem: it can misjudge whether dry burning has occurred. For example, in the initial stage, the thermocouple at the flame point detects a high temperature while the thermocouple at the pot point detects a low temperature. When the pot is removed, the same situation will occur, with one thermocouple at a high temperature and the other at a low temperature. In addition, the same situation will occur when the pot is tossed. These three situations will make it impossible to accurately determine whether the gas shut-off has occurred. Utility Model Content

[0005] To address the shortcomings of existing gas stoves that cannot accurately determine whether they are burning dry, thus making it impossible to accurately determine whether to shut off the gas supply, this utility model provides a gas stove with an automatic gas shut-off function.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] A gas stove with an automatic gas shut-off function includes a gas stove body with an electronic timer. The gas stove body includes a controller with a timing function, an inner flame ring, a first thermocouple located at the flame of the inner flame ring and connected to the controller, an outer flame ring, and a gas supply mechanism controlled by the controller to supply gas to the two flame rings. The inner flame ring has a vertically downward extending mounting cylinder in the middle. The top of the mounting cylinder has an opening, and inside it, from top to bottom, are a spring, a ring-shaped pressure sensor, a cylindrical mounting base, and a second thermocouple. The second thermocouple is slidably disposed in the mounting base, and its heated end passes through the mounting base, the pressure sensor, and the spring and extends out from the top opening of the mounting cylinder. The top of the heated end has a stepped structure, and the top and bottom ends of the spring abut against the stepped structure and the top of the mounting base, respectively. When heated by cookware, the heated end of the second thermocouple is pressed downward and slides, compressing the spring. The spring applies elastic force to the pressure sensor. The timing of the removal of the cookware is determined by the characteristics of the applied elastic force, and the cookware is determined to be in a placed state, a tossed state, or a removed state, thereby controlling the gas supply mechanism to shut off the gas supply through the controller.

[0008] Preferably, the gas supply mechanism includes a push-to-turn ignition switch, which has a solenoid valve inside to control the gas supply, and the solenoid valve is connected to the controller.

[0009] As a preferred option, a pulse igniter is also provided at the inner ignition ring, and a micro switch is also provided inside the ignition switch to conduct the pulse igniter circuit.

[0010] Preferably, the outer fire ring includes an intake shell, an outer ring body, and multiple conductive parts. The intake shell is provided with a first intake pipe, and the outer wall of the outer ring body is provided with an exhaust vent. The inner wall of the outer ring body is connected and conductive to the intake shell through the conductive parts. The gas in the first intake pipe enters the intake shell body and enters the outer ring body through the multiple conductive parts, and is discharged and burned through the exhaust vent.

[0011] Preferably, the inner fire ring includes an inner air intake shell and an inner ring body. The inner air intake shell separates the space inside the outer air intake shell into an inner chamber and an outer chamber, and also includes a second air intake pipe. The second air intake pipe passes through the outer air intake shell and communicates with the inner chamber inside the inner air intake shell. The outer side wall of the inner ring body is provided with an inner air outlet. The top of the inner ring body is provided with an annular top plate, and the through hole in the middle of the top plate is the opening for mounting the top of the cylinder.

[0012] Preferably, the wiring of the second thermocouple and pressure sensor passes through the bottom surface of the intake inner housing and the intake outer housing and is connected to the control, and high-temperature resistant sealant is provided at the passage.

[0013] Preferably, the gas stove body also includes a stand, which includes an annular base and a support frame mounted on the annular base. The support frame includes a first horizontal section, an inclined section, and a second inclined section. In its natural state, the top surface of the heated end of the second thermocouple is higher than the height of the first horizontal section.

[0014] Compared with the prior art, the advantages of this utility model are as follows: This application sets up an installation cylinder inside the inner fire ring and installs a second thermocouple that is supported by a spring and can be raised and lowered. At the same time, a pressure sensor is set at the bottom of the spring. By sensing the change of spring pressure and cooperating with a controller with a timing function, the placement, tossing and removal states of the pot are accurately judged to provide an intelligent gas cut-off protection scheme and improve the safety of the gas stove. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0016] Figure 1 This is a perspective view of the present application;

[0017] Figure 2 A diagram showing the distribution of the gas supply pipeline for the fire ring;

[0018] Figure 3 This is a cross-sectional view of this application;

[0019] Figure 4 A 3D view of the two sensors at the inner fire ring;

[0020] In the diagram: 10, Gas stove body; 101, First gas inlet pipe; 102, Second gas inlet pipe; 103, Stand; 104, Outer burner ring; 105, Inner burner ring; 20, First thermocouple; 30, Second thermocouple; 301, Heated end; 40, Spring; 50, Pressure sensor; 60, Mounting base. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0022] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures. Example

[0023] This embodiment mainly describes the title of a gas stove with an automatic gas shut-off function, as follows:

[0024] A gas stove with automatic gas shut-off function, such as Figure 1-4 As shown, the gas stove body 10 includes an electronic timer. The gas stove body 10 includes a controller, an inner flame ring 105, a first thermocouple 20 located at the flame of the inner flame ring 105 and connected to the controller, an outer flame ring 104, and a gas supply mechanism controlled by the controller to supply gas to both flame rings. The inner flame ring 105 has a vertically downward-extending mounting cylinder in its center. The top of the mounting cylinder has an opening, and inside it, from top to bottom, are arranged a spring 40, a ring-shaped pressure sensor 50, a cylindrical mounting base 60 fixed inside the mounting cylinder, and a second thermocouple 30. The second thermocouple 30 is slidably mounted on the mounting base 60. The heating end 301 of the second thermocouple 30 passes through the mounting base 60, the pressure sensor 50 and the spring 40 and extends out from the top opening of the mounting cylinder. The top of the heating end 301 is provided with a stepped structure, and the top and bottom ends of the spring 40 abut against the stepped structure and the top of the mounting base 60, respectively. When heated by the cookware, the heating end 301 of the second thermocouple 30 is pressed down and slides to compress the spring 40. The spring 40 applies elastic force to the pressure sensor 50. The timing of the removal of the cookware is determined by the characteristics of the applied elastic force, and it is determined whether the cookware is in the placed state, the tossing state or the removed state, so as to control the gas supply mechanism to cut off the gas supply through the controller. This solution primarily addresses dry burning and empty burning. Dry burning prevention utilizes a second sensor to detect the pot bottom temperature at a specific frequency. Temperature change curves for different cookware during heating are pre-input into the controller. When the pot bottom temperature rises sharply and deviates significantly from the temperature change curve, the gas supply is cut off. Empty burning prevention is achieved through a combination of a second thermocouple 30 and a pressure sensor 50. The pressure sensor 50 determines whether a cookware is placed on the gas stove. Gas shut-off is not triggered when a cookware is on the stove unless the second thermocouple 30 detects an abnormal temperature rise curve. When the cookware is removed, two scenarios occur: tossing the pot or complete removal. These two states are identified by pressure changes detected by the pressure sensor 50 and the controller over a certain period. Because tossing the pot frequently places it on the stove, pressure values ​​are detected within a certain timeframe. After complete removal, the pressure value remains at its initial state. This allows for accurate assessment of various scenarios throughout the entire process, providing a more intelligent gas shut-off protection function. The first thermocouple 20 is used to send a feedback signal to the controller to cut off the gas supply in the event of an accidental flameout, such as when the flame is blown out by a strong wind, so as to prevent the gas supply from being maintained and thus avoiding danger.

[0025] Preferably, the gas supply mechanism includes a push-button rotary ignition switch, which contains a solenoid valve that controls the gas supply. The solenoid valve is connected to a controller. The gas flow is controlled by the ignition switch and the solenoid valve.

[0026] Preferably, a pulse igniter is also provided at the inner ignition ring 105, and the ignition switch also contains a micro switch for turning on the pulse igniter circuit. The micro switch is used to control the opening and closing of the pulse igniter.

[0027] Preferably, the outer flame ring 104 includes an intake shell, an outer ring, and multiple conductive parts. The intake shell is provided with a first intake pipe 101, and the outer wall of the outer ring is provided with an exhaust vent. The inner wall of the outer ring is connected to the intake shell through the conductive parts and is in communication with it. The gas in the first intake pipe 101 enters the intake shell and enters the outer ring through the multiple conductive parts, and is discharged from the exhaust vent and burned.

[0028] Preferably, the inner fire ring 105 includes an air intake inner shell and an inner ring body. The air intake inner shell isolates the space inside the air intake outer shell into an inner chamber and an outer chamber, and also includes a second air intake pipe. The second air intake pipe 102 passes through the air intake outer shell and communicates with the inner chamber inside the air intake inner shell. The outer side wall of the inner ring body is provided with an inner air outlet. The top of the inner ring body is provided with an annular top plate, and the through hole in the middle of the top plate is the opening for mounting the top of the cylinder.

[0029] Preferably, the wiring of the second thermocouple 30 and the pressure sensor 50 passes through the bottom surface of the intake inner housing and the intake outer housing and is connected to the control, and high-temperature resistant sealant is provided at the passage.

[0030] Preferably, the gas stove body 10 also includes a frame 103, which includes an annular base and a support mounted on the annular base. The support includes a first horizontal section, an inclined section and a second inclined section in sequence. In its natural state, the top surface of the heated end 301 of the second thermocouple 30 is higher than the height of the first horizontal section.

[0031] The above provides a detailed description of a gas stove with an automatic gas shut-off function provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A gas stove with an automatic gas shut-off function, comprising a gas stove body with an electronic timer, the gas stove body including a controller, an inner flame ring, a first thermocouple disposed at the flame of the inner flame ring and connected to the controller, an outer flame ring, and a gas supply mechanism controlled by the controller to supply gas to the two flame rings, characterized in that, The inner fire ring has a vertically downward extending mounting cylinder in the middle. The top of the mounting cylinder has an opening, and inside it, from top to bottom, are a spring, a ring-shaped pressure sensor, a cylindrical mounting base, and a second thermocouple. The second thermocouple is slidably disposed in the mounting base, and its heated end passes through the mounting base, the pressure sensor, and the spring and extends out from the top opening of the mounting cylinder. The top of the heated end has a stepped structure, and the top and bottom ends of the spring abut against the stepped structure and the top of the mounting base, respectively. When heated by cookware, the heated end of the second thermocouple is pressed downward and slides, compressing the spring. The spring applies elastic force to the pressure sensor. The characteristics of the applied elastic force are used to determine the time characteristics of the cookware being removed and to determine whether the cookware is in a placed state, a tossing state, or a removed state, thereby controlling the gas supply mechanism to cut off the gas supply through the controller.

2. A gas stove with automatic gas shut-off function according to claim 1, characterized in that, The gas supply mechanism includes a push-to-turn ignition switch, which contains a solenoid valve that controls the gas supply. The solenoid valve is connected to the controller.

3. A gas stove with automatic gas shut-off function according to claim 2, characterized in that, The inner ignition ring is also equipped with a pulse igniter, and the ignition switch is also equipped with a micro switch for turning on the pulse igniter circuit.

4. A gas stove with automatic gas shut-off function according to claim 1, characterized in that, The outer fire ring includes an intake shell, an outer ring body, and multiple conductive parts. The intake shell is provided with a first intake pipe, and the outer wall of the outer ring body is provided with an exhaust vent. The inner wall of the outer ring body is connected and connected to the intake shell through the conductive parts. The combustion gas in the first intake pipe enters the intake shell body and enters the outer ring body through the multiple conductive parts, and is discharged and burned through the exhaust vent.

5. A gas stove with automatic gas shut-off function according to claim 4, characterized in that, The inner fire ring includes an inner air intake shell and an inner ring body. The inner air intake shell separates the space inside the outer air intake shell into an inner chamber and an outer chamber, and also includes a second air intake pipe. The second air intake pipe passes through the outer air intake shell and communicates with the inner chamber inside the inner air intake shell. The outer side wall of the inner ring body is provided with an inner air outlet. The top of the inner ring body is provided with an annular top plate, and the through hole in the middle of the top plate is the opening for mounting the top of the cylinder.

6. A gas stove with automatic gas shut-off function according to claim 5, characterized in that, The wiring of the second thermocouple and pressure sensor passes through the bottom surface of the intake inner housing and the intake outer housing and is connected to the control, with high-temperature resistant sealant provided at the passage.

7. A gas stove with automatic gas shut-off function according to any one of claims 1-6, characterized in that, The gas stove body also includes a stand, which includes a ring-shaped base and a support frame mounted on the ring-shaped base. The support frame includes a first horizontal section, an inclined section and a second inclined section in sequence. In its natural state, the top surface of the heated end of the second thermocouple is higher than the height of the first horizontal section.

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