A device for automatically shutting off gas when a fire breaks out in a kitchen

Abstract

The utility model relates to kitchen utensil technical field especially is kitchen utensil technical field, and especially discloses a device that can automatically close gas when kitchen fire, the upper surface of valve body is installed with the upper cover body through detachable connection, the upper cover body is fixed with electromagnet through the pressing ring, the electromagnet central fixed one end inserts the static iron core in the dynamic iron core upper end portion inner chamber, installs the return spring in the dynamic iron core upper end inner chamber, the valve body top is fixed with microprocessor and temperature sensor, temperature sensor, electromagnet and microprocessor electricity is connected. Advantageous effect lies in: through monitoring kitchen whole environment temperature, not partial pot bottom temperature, can identify the environmental abnormal temperature rise caused by dry burning, covers the fire scene that traditional scheme cannot detect, adopts pipeline series connection type installation, need not to transform stove head structure, solved the problem that the cost is high, the maintenance is difficult of traditional stove head built -in sensor need high temperature resistance, can be used as additional spare part to the existing old gas stove and carry out the reform.

Description

Technical Field

[0001] This utility model relates to the field of kitchenware technology, and in particular to a device that can automatically shut off the gas when a kitchen fire occurs. Background Technology

[0002] It's common to forget to turn off a gas stove while it's boiling water or cooking, leading to prolonged dry burning and even fires. Traditional anti-dry-burning gas stoves use thermistor sensors on the burner to detect the temperature of the pot bottom and automatically shut off the gas and flame when it exceeds a preset value; or they use a pre-set timer valve to force a timed shutdown to prevent dry burning. However, these methods have several drawbacks: thermistor sensors on the burner need to withstand extremely high temperatures in the flame, resulting in higher costs; and with forced timers, dry burning cannot be detected when unattended. Furthermore, repairing existing anti-dry-burning devices is inconvenient, and adding them to stoves that didn't come with them at the factory is also difficult. Utility Model Content

[0003] This invention provides a device that can automatically shut off the gas supply in the event of a kitchen fire in order to solve the above-mentioned problems.

[0004] The technical solution of this utility model is implemented as follows:

[0005] A device that automatically shuts off gas in the event of a kitchen fire includes a valve body. The valve body is internally divided into two chambers, A and B, by a partition. The partition has connecting holes for connecting the two chambers. Connecting pipes connecting the two chambers are installed on both sides of the valve body. A valve stem, corresponding to the position of the connecting holes, is vertically slidably installed on the upper part of the valve body. One end of the valve stem is inserted into chamber A and a plug for blocking the connecting holes is installed at the end. A movable iron core, which is slidably installed inside the upper part of the valve body, is fixed to the other end of the valve stem. A top cover is detachably connected to the upper surface of the valve body. An electromagnet is fixed to the top cover by a pressure ring. A stationary iron core, with one end inserted into the inner cavity of the upper part of the movable iron core, is fixed in the center of the electromagnet. A return spring is installed in the inner cavity of the upper part of the movable iron core. A microprocessor and a temperature sensor are fixed to the top of the valve body. The temperature sensor, the electromagnet, and the microprocessor are electrically connected.

[0006] Furthermore, the outer end of the connecting pipe is nested with an external hexagonal threaded connector, which is rotatably fitted to the connecting pipe, and a limiting ring is formed on the outer circle of the end of the connecting pipe that is fitted with the external hexagonal threaded connector.

[0007] Furthermore, an indicator light and an alarm are fixed at the top of the upper cover body, and a contact switch for controlling the power supply of the indicator light and the alarm is installed between the moving iron core and the valve body. A power supply module for supplying power to the indicator light and the alarm is fixed inside the valve body.

[0008] Furthermore, the electromagnet is slidably mounted inside the upper cover, and the pressure ring is threadedly mounted on the inner wall of the upper cover.

[0009] Furthermore, the alarm device can be either a sound alarm device or a wireless alarm device.

[0010] The beneficial effects of this utility model, achieved by adopting the above technical solution, are as follows: By monitoring the overall ambient temperature of the kitchen, rather than the temperature of a local pot bottom, it can identify abnormal temperature rises caused by dry burning, covering fire scenarios that traditional solutions cannot detect; the series-connected pipe installation eliminates the need to modify the stove structure, solving the problems of high cost and difficult maintenance caused by the high-temperature tolerance required for traditional stove built-in sensors; it can be used as an add-on to modify existing old gas stoves, making installation simple and convenient; the valve stem linkage contact switch triggers an audible and visual alarm, providing a clear indication of the valve status; the detachable design of the upper cover allows for quick replacement of core components such as the electromagnet and microprocessor, reducing maintenance costs. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a main sectional view of the present invention;

[0013] Figure 2 This is a perspective view of the present invention;

[0014] Figure 3 This is a top view of the present invention;

[0015] Figure 4 This is a side view of the present invention;

[0016] Figure 5 This is a circuit structure block diagram of this utility model.

[0017] The annotations in the attached figures are explained as follows:

[0018] 1. Valve body; 2. Connecting pipe; 3. External hexagonal threaded connector; 4. Connecting hole; 5. Power module; 6. Plug core; 7. Valve stem; 8. Moving iron core; 9. Return spring; 10. Stationary iron core; 11. Electromagnet; 12. Upper cover; 13. Pressure ring; 14. Microprocessor; 15. Indicator light; 16. Alarm; 17. Temperature sensor; 18. Contact switch. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1-5 As shown, a device that automatically shuts off gas in the event of a kitchen fire includes a valve body 1. The valve body 1 is internally divided into two chambers, A and B, by a partition. The partition has connecting holes 4 that connect the two chambers. Connecting pipes 2, respectively connecting chambers A and B, are installed on both sides of the valve body 1. The connecting pipes 2 are threadedly assembled with the valve body 1. The connecting pipes 2 can be either a connector with an internal thread at one end and an external thread at the other, or a connector with external threads at both ends. A valve stem 7, corresponding to the position of the connecting hole 4, is vertically slidably installed on the upper part of the valve body 1. A guide sleeve is installed inside the valve body 1 to restrict the vertical movement of the valve stem 7. A sealing ring is installed on the surface of the guide sleeve that contacts the valve stem 7. One end of the valve stem 7 is inserted into cavity A and a plug 6 for blocking the connection hole 4 is installed at the end. The other end of the valve stem 7 is fixed with a moving iron core 8 that is slidably installed inside the upper end of the valve body 1. An upper cover 12 is detachably connected to the upper surface of the valve body 1. An electromagnet 11 is fixed to the upper cover 12 by a pressure ring 13. A stationary iron core 10 is fixed in the center of the electromagnet 11, with one end inserted into the inner cavity of the upper end of the moving iron core 8. The electromagnet 11 is a self-holding relay (Omron G5Q-1A4), with a coil voltage of 5VDC and a contact capacity of 10A. It only requires a pulse current to switch states. A return spring 9 is installed inside the upper cavity of the moving iron core 8. A microprocessor 14 and a temperature sensor 17 are fixed at the top inside the valve body 1. The temperature sensor 17, the electromagnet 11 and the microprocessor 14 are electrically connected (e.g., Figure 5 (b) As shown, the temperature sensor 17 uses an automotive-grade NTC thermistor (EPCOS B57861S0103F040), with an operating temperature of -40℃ to +250℃ and an accuracy of ±1%. It is resistant to high temperatures and oil stains and can be directly exposed in the kitchen environment without the need for an additional protective cover. The microprocessor 14 is an STM32F030C6T6 with a built-in high-precision ADC that can be directly connected to the thermistor. Its cost performance is better than that of the traditional 51 microcontroller.

[0021] In another preferred embodiment of this utility model, the microprocessor 14 is equipped with a temperature rise rate calculation unit, which calculates the temperature change rate with a period of 0.5s. When the temperature is detected to be ≥65℃ and the temperature rise rate is ≥4℃ / s for three consecutive cycles, the microprocessor 14 outputs a valve closing command. The electromagnet 11 is de-energized and cuts off the gas supply within 200ms after receiving the command. The microprocessor 14 determines the state of dry burning based on the following criteria: 1. Ambient temperature ≥T1 (50℃≤T1≤70℃); 2. Temperature rise rate ≥ΔT / Δt (≥3℃ / s); either condition needs to be met. In another preferred embodiment of this utility model, the outer end of the connecting pipe 2 is nested with an external hexagonal threaded connector 3. The external hexagonal threaded connector 3 is rotatably fitted with the connecting pipe 2. A limiting protrusion is formed on the outer circle of the end of the connecting pipe 2 that is fitted with the external hexagonal threaded connector 3. The external hexagonal threaded connector 3 can rotate 360° relative to the connecting pipe 2. When installing the pipeline, the sealing connection of the pipeline can be quickly completed after installing a gasket in the external hexagonal threaded connector 3. It is practical, simple and convenient.

[0022] In another preferred embodiment of this utility model, an indicator light 15 and an alarm 16 are fixedly installed on the top of the upper cover 12. A contact switch 18 for controlling the power supply of the indicator light 15 and the alarm 16 is installed between the moving iron core 8 and the valve body 1. A light-transmitting hole is formed on the upper cover 12 corresponding to the position of the indicator light 15, and a sound-transmitting hole is formed corresponding to the position of the alarm 16. A power module 5 for supplying power to the indicator light 15 and the alarm 16 is fixed inside the valve body 1. The indicator light 15 is a light-emitting diode, and the alarm 16 is a wireless alarm with a model number ESP-01S Wi-Fi module, which is low-power and can push alarm information to a mobile APP. The power module 5 can be a dry cell battery (e.g., a battery with a capacity of 1000 kcal / 5 ... Figure 5 (as shown in (a)) Alternatively, the power supply module 5 can be omitted, and the direct power supply that powers the microprocessor 14 can be used for power supply.

[0023] In another preferred embodiment of this utility model, the electromagnet 11 is slidably installed inside the upper cover 12, and the pressure ring 13 is threadedly installed on the inner wall of the upper cover 12, which facilitates the disassembly and replacement of damaged parts and reduces maintenance costs.

[0024] The working principle of this utility model is as follows: In use, the device can be installed between the gas pipeline and the gas stove. A hole can be made on the end face of the gas stove so that the upper cover 12 protrudes from the gas stove. An external power supply is used to power the electromagnet 11, the temperature sensor 17, and the microprocessor 14. After the electromagnet 11 is powered, it generates an attraction force that causes the moving iron core 8 to approach the stationary iron core 10. At this time, the connection hole 4 is in the open state. The temperature sensor 17 monitors the ambient temperature in the kitchen. When the ambient temperature in the kitchen reaches the set value due to dry burning, the temperature sensor 17 sends a signal to the microprocessor 14. The microprocessor 14 controls the electromagnet 11 to be de-energized. After the electromagnet 11 is de-energized, the magnetic force is small, and the reset spring 9 pushes the moving iron core 8 away from the stationary iron core 10. At the same time, the valve stem 7 drives the plug 6 to block the connection hole 4, thereby blocking the gas supply and extinguishing the gas stove. When the plug 6 blocks the connection hole 4, the moving iron core 8 drives the contact switch 18 to the closed state. At this time, the indicator light 15 and the alarm 16 are energized and issue an alarm prompt, while also reminding the user that the connection hole 4 is in the closed state.

[0025] The circuit connection involved in this utility model is a common method used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. It belongs to the widely used prior art.

[0026] Components not described in detail in this article are existing technologies.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device that automatically shuts off gas in the event of a kitchen fire, comprising a valve body (1), wherein the valve body (1) is internally divided into two chambers, A and B, by a partition, and the partition has a connecting hole (4) forming a connection between the two chambers A and B; connecting pipes (2) connecting the two chambers A and B are respectively installed on both sides of the valve body (1); a valve stem (7) corresponding to the position of the connecting hole (4) is vertically slidably installed on the upper part of the valve body (1); one end of the valve stem (7) is inserted into the A chamber and a plug (6) for blocking the connecting hole (4) is installed on the end; and a movable iron core (8) is fixedly installed on the upper part of the valve body (1) at the other end of the valve stem (7), characterized in that: The valve body (1) has an upper cover (12) detachably connected to the upper surface. The upper cover (12) is fixed with an electromagnet (11) by a pressure ring (13). The electromagnet (11) has a stationary iron core (10) fixed in the center, with one end inserted into the inner cavity of the upper end of the moving iron core (8). A reset spring (9) is installed in the inner cavity of the upper end of the moving iron core (8). The valve body (1) has a microprocessor (14) and a temperature sensor (17) fixed at the top. The temperature sensor (17), the electromagnet (11) and the microprocessor (14) are electrically connected.

2. The device for automatically shutting off gas in the event of a kitchen fire, as described in claim 1, is characterized in that: The outer end of the connecting pipe (2) is nested with an external hexagonal threaded connector (3). The external hexagonal threaded connector (3) is rotatably fitted with the connecting pipe (2). A limiting ring is formed on the outer circle of the end of the connecting pipe (2) that is fitted with the external hexagonal threaded connector (3).

3. The device for automatically shutting off gas in the event of a kitchen fire, as described in claim 1, is characterized in that: An indicator light (15) and an alarm (16) are fixed inside the top of the upper cover (12). A contact switch (18) for controlling the power supply of the indicator light (15) and the alarm (16) is installed between the moving iron core (8) and the valve body (1). A power supply module (5) for supplying power to the indicator light (15) and the alarm (16) is fixed inside the valve body (1).

4. The device for automatically shutting off gas in the event of a kitchen fire, as described in claim 1, is characterized in that: The electromagnet (11) is installed inside the upper cover (12) by sliding fit, and the pressure ring (13) is installed on the inner wall of the upper cover (12) by threaded connection.

5. A device for automatically shutting off gas in the event of a kitchen fire, as described in claim 3, characterized in that: The alarm (16) is either a sound alarm (16) or a wireless alarm (16).

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