Commercial gas stove with flameout protection device and flameout protection method

Abstract

The present invention discloses a commercial gas stove with a flameout protection device and a flameout protection method, comprising a furnace body and a controller, a furnace head is arranged in a furnace cavity of the furnace body, the furnace head comprises a long-lit torch and a main burning torch, the long-lit torch is provided with a flame-spraying hole, an ignition switch is arranged on a first gas supply pipeline of the long-lit torch, the controller is electrically connected to the ignition switch, an ignition needle is arranged on one side of the flame-spraying hole of the long-lit torch, the ignition switch is electrically connected to the ignition needle, a first energy reflection sheet in an inverted cone shape is arranged between the long-lit torch and the main burning torch, a fire-spraying hole is arranged in the middle of the first energy reflection sheet, a heat isolation zone is formed in the lower space of the first energy reflection sheet, an induction needle is arranged in the heat isolation zone, the induction needle is located on one side of the flame-spraying hole, and the controller is electrically connected. Through the layered arrangement of the long-lit torch and the main burning torch, the first energy reflection sheet and the cooling component cool down the heat isolation zone to avoid excessive heat radiation to the induction needle causing damage.

Description

Technical Field

[0001] The invention relates to the field of safety protection of stoves, and in particular to a commercial gas stove with a flameout protection device and a flameout protection method. Background Art

[0002] The induction needle is a very important component of the gas stove. The quality of the induction needle is related to the ignition reaction time and ignition success rate of the gas stove. The induction needle is actually a temperature sensing element. It directly measures the temperature and converts the temperature signal into a thermoelectric potential signal. The induction needle is composed of two different alloy materials. Different alloy materials will produce different thermoelectric potentials under the action of temperature. The induction needle is made by using the different thermoelectric potentials generated by different alloy materials under the action of temperature. When the two ends of the conductors of two different components are connected to form a loop, when the temperature of the junction point is different, an electromotive force will be generated in the loop. This phenomenon is called the thermoelectric effect, and this electromotive force is called the thermoelectric potential. The induction needle uses this principle to measure temperature. Among them, the end directly used to measure the temperature of the medium is called the working end, and the other end is called the cold end; the cold end is connected to the display instrument or the matching instrument, and the display instrument will indicate the thermoelectric potential generated by the induction needle. The height of the induction needle should be basically the same as the height of the fire cover, and care should be taken to maintain the distance between the induction needle and the fire cover. The distance between the sensing needle and the fire cover cannot be too far. Generally, it is better to keep a distance of 4±0.5mm. If the installation position is too low, the sensing needle will not be heated enough, and the thermoelectric potential will not be enough to make the solenoid valve close. If the installation position is too high, the flame will be too large and the sensing needle will be easily burned. For the same reason, if it is too far, the thermoelectric potential will not be enough and the solenoid valve will not close.

[0003] At present, gas stoves are mostly divided into two types: commercial and household. Commercial gas stoves are widely used in crowded hotels, restaurants, food stalls, canteens, shopping malls and other places due to their high power and high cooking efficiency. The principle is to connect a medium-pressure valve or a high-pressure valve in the gas pipeline to make the gas pipeline output a large amount of fuel, and then provide more oxygen for combustion with a blower, which provides more heat for cooking. Due to its high power and long service time, the temperature in the central combustion area will be very high, which can easily burn the ignition needle and the induction needle on the burner, causing the ignition needle and the induction needle to lose the ignition and flameout protection function, and replacement is cumbersome. Therefore, most of the existing commercial gas stoves are not equipped with ignition needles and induction needles, but only a long-burning torch and a main torch are arranged on the burner, which are separately controlled by two gas valves. When in use, the long-burning torch is usually ignited manually by an extended igniter. After the pot is placed, the gas valve of the main torch is opened, and the torch fire of the long-burning torch ignites the main torch. However, this combustion mode without flameout protection poses serious safety hazards and does not meet the national mandatory management standards. Before the pilot flame is ignited, if the gas valve of the main torch is open, then after the pilot flame is ignited, the main flame will be ignited at the same time. Due to the large air volume of the main torch, it is very easy to cause deflagration, which poses a great safety hazard, especially for high-power commercial stoves.

[0004] At present, there are two main reasons for removing the induction needle: first, due to the uneven mixing of gas and air and unstable combustion under the action of the blower and the medium pressure valve of the commercial gas stove, the induction needle misjudged the flameout; second, due to the short service life of the induction needle, it is easy to be damaged and cannot ignite normally, and it is time-consuming and laborious to remove and replace it. In summary, the existing induction structure needs to be further improved to solve the above problems. Summary of the invention

[0005] In view of the above difficulties, the present invention proposes a commercial gas stove with a flameout protection device and a flameout protection method. The sensing needle is not easily burned, the burning of the sensing needle is stable after ignition, and the signal is continuously transmitted to the controller, so that the commercial gas stove has good stability in use.

[0006] The present invention provides a commercial gas stove with a flameout protection device, comprising a furnace body and a controller. A furnace cavity of the furnace body is provided with a furnace head, the furnace head comprises a long-lit torch and a main torch, the long-lit torch is provided with a flame-spraying hole, an ignition switch is provided on a first gas supply pipeline of the long-lit torch, the controller is electrically connected to the ignition switch, an ignition needle is provided on one side of the flame-spraying hole of the long-lit torch, the ignition switch is electrically connected to the ignition needle, the main torch is arranged in a ring shape, the upper surface of the main torch is a circular array with a plurality of main flame holes, a manual-automatic valve is provided on the second gas supply pipeline of the main torch, the manual-automatic valve is electrically connected to the controller, the long-lit torch is arranged below the middle of the main torch, a first energy reflection sheet in the shape of an inverted cone is provided between the long-lit torch and the main torch, a fire-spreading hole is provided in the middle of the first energy reflection sheet, a heat isolation zone is formed in the lower space of the first energy reflection sheet, an induction needle is provided in the heat isolation zone, the induction needle is located on one side of the flame-spraying hole, and the induction needle is electrically connected to the controller.

[0007] Furthermore, the first energy reflection sheet comprises a surface reflection layer and a bottom heat insulation layer, the reflection layer is made of ceramic or metal material, and the heat insulation layer is made of aluminum silicate.

[0008] Furthermore, it also includes a cooling component and a heat exchange component, the cooling component is connected to the heat exchange component, and the cooling component is arranged in the heat isolation area.

[0009] Furthermore, the cooling component includes a cooling pipe, which is arranged in a ring shape in the heat isolation area and is located between the inner wall of the main torch and the sensing needle. The cooling component is a water pipe and a faucet. One end of the cooling pipe is connected to the water pipe, and the other end is connected to the faucet.

[0010] Furthermore, the cross-section of the cooling tube is circular or square, and the material is any one of a stainless steel tube, a copper tube, and an aluminum tube.

[0011] Preferably, the cooling tube is a square aluminum tube.

[0012] Furthermore, it also includes an air supply pipeline, on which a blower and an air volume regulating valve are provided, and a gas premixing chamber with a hollow structure is provided below the main torch, and the gas premixing chamber is connected to the air supply pipeline and the second gas supply pipeline.

[0013] Furthermore, a mixer for evenly mixing the gas and air is provided in the gas premixing chamber.

[0014] Further preferably, a spiral mixing blade is provided inside the mixer, and a diverter plate is provided above the mixer.

[0015] The flameout protection method of a commercial gas stove with a flameout protection device comprises the following steps:

[0016] S1. Place the first energy reflection sheet between the long-burning torch and the main burning torch, so that the induction needle is located in the heat isolation area of ​​the first energy reflection sheet. Manually control the ignition switch to ignite the long-burning torch through the ignition needle. The flame ejected from the flame hole is divided into a main flame and a side flame through the flame dividing hole. The main flame is used to ignite the main burning torch, and the side flame is used to burn the induction needle to generate induced electricity to the controller.

[0017] S2, flame detection. If the controller collects the induced electricity generated by the induction needle, keep the ignition switch open, manually open the manual-automatic valve, and ignite the main torch through the long-burning torch to cook. If the controller does not collect the induced electricity, the ignition switch is automatically turned off and the process goes to step S1 to re-ignite.

[0018] S3. During the cooking process, the controller continuously detects the flame. If the induction electricity generated by the induction needle is not collected, the controller automatically turns off the ignition switch and the manual-automatic valve.

[0019] Specifically, a cooling component is arranged in the heat isolation zone to further reduce the temperature in the heat isolation zone.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The side flame of the long-open torch burns the sensing needle through the flame-dividing hole. The side flame burns stably without deviation, so that the sensing needle generates a stable signal to the controller, thus preventing the controller from making misjudgments.

[0022] 2. Through the layered arrangement of the long-burning torch and the main burning torch, the first energy reflector and the cooling component cool down the heat isolation area to avoid excessive heat radiation to the induction needle and cause damage. At the same time, part of the heat energy is reflected to the bottom of the pot, thereby improving the utilization rate of heat energy. Compared with the induction needle of the traditional commercial stove, its service life is extended by more than 4 times.

[0023] 3. The air and gas of the pilot torch and the main torch are supplied separately, and the air and gas of the main torch are mixed and diverted evenly through the mixer and the diverter plate. The gas combustion of the pilot torch and the main torch is stable, reducing the probability of accidental flameout of the commercial stove due to air and gas supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a commercial gas stove with a flameout protection device;

[0025] Figure 2 This is a schematic diagram of the structure of the cooling tube in Example 1.

[0026] 1-furnace body, 2-controller, 3-burner head, 4-long torch, 5-main torch, 6-flame-spraying hole, 7-first gas supply pipeline, 8-ignition switch, 9-ignition needle, 10-main fire hole, 11-second gas supply pipeline, 12-manual and automatic valve, 13-first energy reflection sheet, 14-fire hole, 15-heat isolation area, 16-sensing needle, 17-cooling pipe, 18-furnace cavity, 19-cooling component, 20-heat exchange component, 21-tap pipe, 22-faucet, 23-air supply pipeline, 24-blower, 25-air volume regulating valve, 26-gas premixing chamber, 27-mixer, 28-mixing blade, 29-dividing plate, 30-cooker, 31-second energy reflection sheet. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1 , Figure 2 As shown, the present invention is a commercial gas stove with a flameout protection device, including a furnace body and a controller. A furnace head is provided in a furnace cavity of the furnace body, and the burner head includes a long-lit torch and a main torch. The long-lit torch is provided with a flame hole, and an ignition switch is provided on the first gas supply pipeline of the long-lit torch. The controller is electrically connected to the ignition switch, and an ignition needle is provided on one side of the flame hole of the long-lit torch, and the ignition switch is electrically connected to the ignition needle. The main torch is arranged in a ring shape, and the upper surface of the main torch is a circular array with a plurality of main flame holes. A manual-automatic valve is provided on the second gas supply pipeline of the main torch, and the manual-automatic valve is electrically connected to the controller. The long-lit torch is arranged below the middle of the main torch, and a first energy reflection sheet in the shape of an inverted cone is provided between the long-lit torch and the main torch, and a fire dividing hole is provided in the middle of the first energy reflection sheet. A heat isolation zone is formed in the lower space of the first energy reflection sheet, and an induction needle is provided in the heat isolation zone, which is located on one side of the flame hole, and the induction needle is electrically connected to the controller.

[0030] The fire separation hole is used to divide the flame burning in the flame hole of the long-burning torch into a main flame and a side flame. The main flame is higher and easily affected by the movement of the pot during cooking. After the flame is separated through the fire separation hole, the side flame is located at a lower position and is less affected, so it can continuously and stably burn the induction needle.

[0031] The first energy reflection sheet includes a surface reflection layer and a bottom insulation layer. The reflection layer is made of metal material, stainless steel in this embodiment, with a surface finish of no more than Ra1.6, and can reflect heat energy to the bottom of the cookware. The insulation layer is aluminum silicate and has good high temperature resistance and heat insulation properties.

[0032] It also includes a cooling component and a heat exchange component. The cooling component is connected to the heat exchange component, and the cooling component is arranged in the heat isolation area.

[0033] The cooling component described in this embodiment includes a cooling pipe, which is arranged in a ring shape in the heat isolation zone and is located between the inner wall of the main torch and the sensing needle. The cooling component is a tap water pipe and a faucet. One end of the cooling pipe is connected to the tap water pipe, and the other end is connected to the faucet. During the cooking process, water from the faucet can take away the heat energy in the heat isolation zone and reduce the temperature in the heat isolation zone. The cross-section of the cooling pipe is a circular stainless steel pipe with a wall thickness of 1 mm.

[0034] It also includes an air supply pipeline, on which a blower and an air volume regulating valve are provided, and a gas premixing chamber with a hollow structure is provided below the main torch, and the gas premixing chamber is connected to the air supply pipeline and the second gas supply pipeline. A mixer for uniformly mixing gas and air is provided in the gas premixing chamber, and a spiral mixing blade (i.e., SK type static mixer) is provided inside the mixer, and a diverter plate is provided above the mixer. As shown by the arrow in 1, after the gas and air are uniformly mixed in the mixer, they are diverted to the main fire holes in different directions for combustion through the diverter plate. Compared with the conventional method of mixing after diversion, the mixing uniformity of the present invention is better, the combustion is more complete, and the stability is better.

[0035] The flameout protection method of a commercial gas stove with a flameout protection device comprises the following steps:

[0036] S1. Place the first energy reflection sheet between the long-burning torch and the main burning torch, so that the induction needle is located in the heat isolation area of ​​the first energy reflection sheet. Manually control the ignition switch to ignite the long-burning torch through the ignition needle. The flame ejected from the flame hole is divided into a main flame and a side flame through the flame dividing hole. The main flame is used to ignite the main burning torch, and the side flame is used to burn the induction needle to generate induced electricity to the controller.

[0037] S2, flame detection. If the controller collects the induced electricity generated by the induction needle, keep the ignition switch open, manually open the manual-automatic valve and the air volume regulating valve, and make the gas and air ratio of the main torch reasonable. By observing the state of flame burning, the opening size of the manual-automatic valve and the air volume regulating valve is mastered, and the main torch is ignited by the long-burning torch for cooking. If the controller does not collect the induced electricity, the ignition switch is automatically turned off, and the process goes to step S1 to re-ignite.

[0038] S3. During the cooking process, the controller continuously detects the flame. If the induced electricity generated by the induction needle is not collected, the controller automatically turns off the ignition switch and the manual-automatic valve. A cooling component is provided in the heat isolation area to further reduce the temperature in the heat isolation area.

[0039] The control steps of the present invention follow the flameout protection principle of "if the pilot flame is not extinguished, the main flame cannot be extinguished; if the pilot flame is extinguished, the main flame must be extinguished".

[0040] Example 2

[0041] The present invention discloses a commercial gas stove with a flameout protection device, comprising a stove body and a controller. A stove head is arranged in a stove cavity of the stove body, and the stove head comprises a long-lit torch and a main burning torch. The long-lit torch is provided with a flame-spraying hole. An ignition switch is arranged on a first gas supply pipeline of the long-lit torch. The controller is electrically connected to the ignition switch. An ignition needle is arranged on one side of the flame-spraying hole of the long-lit torch. The ignition switch is electrically connected to the ignition needle. The air supply of the long-lit torch is the same as that of a traditional stove. After the air is mixed with the gas at the ignition switch, combustion is carried out at the flame-spraying hole. The long-lit torch is mainly used to ignite the main burning torch. The supply of gas and air is relatively small. The main torch is arranged in a ring shape, and the upper surface of the main torch is a circular array with multiple main fire holes. The second gas supply pipeline of the main torch is provided with a manual-automatic valve, that is, a manual-automatic electric actuator. The manual-automatic valve is electrically connected to the controller. The long-burning torch is arranged below the middle of the main torch, with a vertical drop distance of 30 mm. A first energy reflecting plate in an inverted cone shape is provided between the long-burning torch and the main torch, and a fire dividing hole is provided in the middle of the first energy reflecting plate. The lower space of the first energy reflecting plate forms a heat isolation zone, and a sensing needle is provided in the heat isolation zone, which is located on one side of the flame hole, and the sensing needle is electrically connected to the controller.

[0042] The first energy reflection sheet includes a surface reflection layer and a bottom insulation layer. The reflection layer is a ceramic material with a thickness of 5 mm, which can reflect heat energy to the bottom of the cookware. The insulation layer is an aluminum silicate with a thickness of 5 mm and has good insulation performance.

[0043] It also includes a cooling component and a heat exchange component, the cooling component is connected to the heat exchange component, and the cooling component is arranged in the heat isolation area. In this embodiment, the cooling component includes a cooling pipe, the heat exchange component is a water tank, and a water pump is arranged in the water tank. The water pump circulates the water in the water tank in the cooling pipe, and the cooling pipe is a square aluminum pipe with a wall thickness of 0.8 mm. In another embodiment, the cooling pipe is a square copper pipe.

Claims

1. A flameout protection method based on a commercial gas stove with a flameout protection device, the commercial gas stove with the flameout protection device comprising a furnace body and a controller, a furnace cavity of the furnace body is provided with a burner, the burner comprises a long-light torch and a main torch, the long-light torch is provided with a flame hole, an ignition switch is provided on a first gas supply pipeline of the long-light torch, the controller is electrically connected to the ignition switch, an ignition needle is provided on one side of the flame hole of the long-light torch, the ignition switch is electrically connected to the ignition needle, the main torch is arranged in a ring shape, the upper surface of the main torch is a circular array with a plurality of main flame holes, characterized in that A manual-automatic valve is provided on the second gas supply pipeline of the main torch, and the manual-automatic valve is electrically connected to the controller. The long-burning torch is provided below the middle of the main torch, and a first energy reflection sheet in the shape of an inverted cone is provided between the long-burning torch and the main torch. A flame-dividing hole is provided in the middle of the first energy reflection sheet, and a heat isolation zone is formed in the lower space of the first energy reflection sheet. A sensing needle is provided in the heat isolation zone, and is located on one side of the flame-spraying hole, and the sensing needle is electrically connected to the controller; It is characterized by comprising the following steps: S1. Place the first energy reflection sheet between the long-burning torch and the main burning torch, so that the induction needle is located in the heat isolation area of ​​the first energy reflection sheet. Manually control the ignition switch to ignite the long-burning torch through the ignition needle. The flame ejected from the flame hole is divided into a main flame and a side flame through the flame dividing hole. The main flame is used to ignite the main burning torch, and the side flame is used to burn the induction needle to generate induced electricity to the controller. S2, flame detection. If the controller collects the induced electricity generated by the induction needle, keep the ignition switch open, manually open the manual-automatic valve, and ignite the main torch through the long-burning torch to cook. If the controller does not collect the induced electricity, the ignition switch is automatically turned off and the process goes to step S1 to re-ignite. S3. During the cooking process, the controller continuously detects the flame. If the induction electricity generated by the induction needle is not collected, the controller automatically turns off the ignition switch and the manual-automatic valve.

2. The flameout protection method for a commercial gas stove with a flameout protection device according to claim 1, characterized in that The first energy reflection sheet comprises a surface reflection layer and a bottom heat insulation layer, the reflection layer is made of ceramic or metal material, and the heat insulation layer is made of aluminum silicate.

3. The flameout protection method for a commercial gas stove with a flameout protection device according to claim 1 or 2, characterized in that It also includes a cooling component and a heat exchange component. The cooling component is connected to the heat exchange component, and the cooling component is arranged in the heat isolation area.

4. The flameout protection method for a commercial gas stove with a flameout protection device according to claim 3, characterized in that The cooling component includes a cooling pipe, which is arranged in a ring shape in the heat isolation area and is located between the inner wall of the main torch and the sensing needle. The cooling component is a tap water pipe and a faucet. One end of the cooling pipe is connected to the tap water pipe, and the other end is connected to the faucet.

5. The flameout protection method for a commercial gas stove with a flameout protection device according to claim 4, characterized in that The cross section of the cooling tube is circular or square, and the material is any one of a stainless steel tube, a copper tube, and an aluminum tube.

6. The flameout protection method for a commercial gas stove with a flameout protection device according to claim 5, characterized in that It also includes an air supply pipeline, on which a blower and an air volume regulating valve are provided. A gas premixing chamber with a hollow structure is provided below the main burner, and the gas premixing chamber is connected to the air supply pipeline and the second gas supply pipeline.

7. The flameout protection method for a commercial gas stove with a flameout protection device according to claim 6, characterized in that The gas premixing chamber is provided with a mixer for uniformly mixing the gas and air.

8. The flameout protection method for a commercial gas stove with a flameout protection device according to claim 7, characterized in that The mixer is provided with spiral mixing blades inside and a splitter plate is provided above the mixer.

9. The flameout protection method for a commercial gas stove with a flameout protection device according to claim 1, characterized in that: A cooling component is arranged in the heat isolation zone to further reduce the temperature in the heat isolation zone.

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