Cooker, and control device and control method for preventing dry boiling thereof

Abstract

The application discloses a stove and a dry burning prevention control device and a control method thereof. The control device comprises a detection module for obtaining static detection data and dynamic detection data of a to-be-detected pot; a driving assembly for driving the dry burning prevention module to move; and a control module connected with the detection module, the driving assembly and the dry burning prevention module, respectively, for issuing a driving control signal to the driving assembly according to the static detection data and the dynamic detection data, so that the driving assembly drives the dry burning prevention module to move in a direction towards or away from the to-be-detected pot, and / or adjusts the working state and the protection temperature threshold of the dry burning prevention module according to the static detection data and the dynamic detection data. The application automatically identifies the static and dynamic detection data of the pot, adjusts the position, the working state and the protection temperature threshold of the dry burning prevention module based on different detection data, improves the applicability of the dry burning prevention module to different pots, improves the dry burning prevention effect, and avoids the dry burning prevention module from being triggered or damaged by collision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range control, in particular to a range and a dry-burn prevention control device and control method thereof. BACKGROUND

[0002] The dry-burn prevention gas range is a kind of gas range with automatic detection of the temperature of the bottom of the pot and automatic cut-off of the gas source when the temperature is too high, which can prevent the dry-burn phenomenon caused by forgetting to turn off the fire or water evaporation during cooking, and avoid safety accidents such as fire.

[0003] In the prior art, the dry-burn prevention gas range usually increases a temperature sensing column in the middle of the burner, and the temperature sensing column senses the temperature of the bottom of the pot, and when the temperature of the bottom of the pot is too high, the gas supply of the burner is automatically cut off. The existing temperature measurement protection strategy has the following problems: different types of pots are used by users during cooking, such as non-metallic pots, aluminum pots, flat-bottomed pots or round-bottomed pots. For non-metallic pots, the temperature of the bottom of the pot detected by the temperature sensing column is too high during the timing work, which easily causes the phenomenon of high-temperature protection of the range to be extinguished in the middle of the way, affecting the use experience; for aluminum pots and other pots with easily deformed concave bottoms, the top of the temperature sensing column is not easy to contact, which easily causes the dry-burn prevention to be triggered; for the scene of frying and turning the pot, the temperature sensing column is easy to collide with the bottom of the pot and be damaged. SUMMARY

[0004] The present application provides a range and a dry-burn prevention control device and control method thereof, to solve the problem that the existing dry-burn prevention module is difficult to be compatible with different pots, which easily causes the dry-burn prevention protection to be triggered or the temperature measurement element to be damaged, and to improve the applicability of the dry-burn prevention module to different pots.

[0005] In a first aspect, the present application provides a dry-burn prevention control device of a range, the range comprising a pot rack, a water receiving tray, a burner and a dry-burn prevention module, the pot rack being used to support a to-be-tested pot, the control device comprising: a detection module, configured to acquire static detection data and dynamic detection data of the to-be-tested pot; a driving assembly, configured to drive the dry-burn prevention module to move; and a control module, connected with the detection module, the driving assembly and the dry-burn prevention module respectively, configured to issue a driving control signal to the driving assembly according to the static detection data and the dynamic detection data, so that the driving assembly drives the dry-burn prevention module to move in a direction towards or away from the to-be-tested pot, and / or adjust the working state and the protection temperature threshold of the dry-burn prevention module according to the static detection data and the dynamic detection data.

[0006] Optionally, the detection module comprises an action detection unit configured to collect dynamic detection data of the to-be-detected pot; the detection module further comprises at least one of the following: a material detection unit, a shape detection unit, and a type detection unit; the material detection unit is configured to obtain material detection data of the to-be-detected pot; the shape detection unit is configured to obtain shape detection data of the to-be-detected pot; and the pot type detection unit is configured to obtain type detection data of the to-be-detected pot; the control module is configured to determine the material of the pot according to the material detection data, and / or determine the shape of the pot according to the shape detection data, and / or determine the type of the pot according to the type detection data; the control module is further configured to identify the easy-to-deform pot cooking scene, the non-easy-to-deform pot cooking scene, or the pot flipping cooking according to at least one of the material of the pot, the shape of the pot, or the type of the pot, and the dynamic detection data, and match the corresponding driving control signal to the easy-to-deform pot cooking scene, the non-easy-to-deform pot cooking scene, or the pot flipping cooking.

[0007] Optionally, the material detection unit comprises at least one of the following: an electrical detection unit, an optical detection unit, and a heat conduction detection unit; the control module is further configured to determine the resistance-capacitance value of the to-be-detected pot according to the material detection data collected by the electrical detection unit, and determine the material of the pot according to the resistance-capacitance value; and / or determine the radiation coefficient of the to-be-detected pot according to the material detection data collected by the optical detection unit, and determine the material of the pot according to the radiation coefficient; and / or determine the thermal conductivity coefficient of the to-be-detected pot according to the material detection data collected by the heat conduction detection unit, and determine the material of the pot according to the thermal conductivity coefficient.

[0008] Optionally, the action detection unit is configured to identify at least one of the real-time distance from the bottom surface of the pot, the pressure borne by the pot rack, and the acceleration of the pot; the control module is further configured to determine the action of the pot and the shape of the pot according to at least one of the real-time distance from the bottom surface of the pot, the pressure borne by the pot rack, or the acceleration of the pot.

[0009] Optionally, the driving assembly comprises a driving motor connected to the control module, configured to receive the driving control signal and execute forward rotation or reverse rotation according to the driving control signal; a transmission mechanism provided with a crank portion and a connecting rod portion, the crank portion being connected to the driving motor, the first end of the connecting rod portion being hinged to the crank portion, and the second end of the connecting rod portion being hinged to the dry boiling prevention module; the crank portion rotates synchronously with the driving motor, and drives the dry boiling prevention module to move in the direction towards or away from the to-be-detected pot through the connecting rod portion; the control module is configured to obtain the crank radius and the connecting rod length of the transmission mechanism, determine the movement distance of the dry boiling prevention module according to the static detection data and the dynamic detection data, determine the crank rotation angle according to the movement distance, the crank radius, and the connecting rod length, and issue the driving control signal according to the crank rotation angle.

[0010] Optionally, the driving assembly further comprises a fixing part, the fixing part is hinged to the second end of the connecting rod part, and the outer periphery of the fixing part is in nested gap fit abutment with the side wall of the hollow part of the burner head, so as to lock and fix the dry burning prevention module, and the dry burning prevention module can move in the direction towards or away from the to-be-tested pot.

[0011] Optionally, the dry burning prevention module comprises a dry burning prevention probe and a supporting part, the dry burning prevention probe is arranged in the hollow part of the burner head, and the supporting part is locked and fixed to the fixing part.

[0012] Optionally, the stove dry burning prevention control device further comprises a timing module and / or an interactive module, the timing module is used for configuring a timing duration, and the interactive module is used for obtaining a working mode of the stove and displaying corresponding data according to the working mode, wherein the working mode comprises at least one of the following: a timing mode, a probe lifting display mode and a dry burning prevention triggering mode.

[0013] In the second aspect, the embodiments of the present application provide a stove dry burning prevention control method, the stove comprises a pot rack, a water receiving tray, a burner and a dry burning prevention module, the pot rack is used for supporting a to-be-tested pot, and the control method comprises the following steps: obtaining static detection data and dynamic detection data of the to-be-tested pot; according to the static detection data and the dynamic detection data, a driving control signal is issued to a driving assembly, so that the driving assembly drives the dry burning prevention module to move in the direction towards or away from the to-be-tested pot, and / or according to the static detection data and the dynamic detection data, the working state and the protection temperature threshold of the dry burning prevention module are adjusted.

[0014] In the third aspect, the embodiments of the present application provide a stove, which comprises a pot rack, a water receiving tray, a burner, a dry burning prevention module and a stove dry burning prevention control device.

[0015] The technical scheme of the embodiments of the present application sets the detection module, the driving assembly and the control module, automatically identifies the static and dynamic detection data of the pot through the detection module, controls the driving assembly to adjust the position of the dry burning prevention module according to different detection data, and adjusts the working state and the protection temperature threshold of the dry burning prevention module according to different detection data, solves the problem that the existing dry burning prevention module is difficult to be compatible with different pots, leading to the problem that the dry burning prevention protection is easily mis-triggered or the temperature measuring element is damaged by collision, improves the temperature measuring protection accuracy of the dry burning prevention module, reduces the misjudgment, improves the applicability of the dry burning prevention module to different pots, improves the dry burning prevention effect, avoids the mis-triggering or collision damage of the dry burning prevention module, improves the user experience and prolongs the service life.

[0016] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0018] Figure 1 A structural schematic diagram of a stove dry burning prevention control device provided by the embodiments of the present application is shown in the figure.

[0019] Figure 2 A structural schematic diagram of a stove with a dry burning prevention control device provided by the embodiments of the present application is shown in the figure.

[0020] Figure 3 An exploded view of a stove with a dry burning prevention control device provided by the embodiments of the present application is shown in the figure.

[0021] Figure 4 A structural schematic diagram of a driving assembly provided by the embodiments of the present application is shown in the figure.

[0022] Figure 5 A perspective view of a driving assembly provided by the embodiments of the present application is shown in the figure.

[0023] Figure 6 An exploded view of a driving assembly and a burner provided by the embodiments of the present application is shown in the figure.

[0024] Figure 7 A structural schematic diagram of a driving assembly and a burner provided by the embodiments of the present application is shown in the figure.

[0025] Figure 8 A structural schematic diagram of another stove dry burning prevention control device provided by the embodiments of the present application is shown in the figure.

[0026] Figure 9 A flow chart of a stove dry burning prevention control method provided by the embodiments of the present application is shown in the figure.

[0027] Figure 10 A flow chart of another stove dry burning prevention control method provided by the embodiments of the present application is shown in the figure.

[0028] Figure 11 A flow chart of still another stove dry burning prevention control method provided by the embodiments of the present application is shown in the figure.

[0029] Figure 12 A flow chart of still another stove dry burning prevention control method provided by the embodiments of the present application is shown in the figure.

[0030] Reference signs:

[0031] 1. Pot support; 2. Water tray; 3. Burner; 4. Stove head; 5. Chassis; 6. Drive motor; 7. Crankshaft; 8. Connecting rod; 9. Fixing part; 10. Hollow part of stove head; 11. Anti-dry burning module; 13. Panel; 14. Timer encoder; 15. Timer encoder knob; 16. Valve body; 100. Detection module; 300. Control module; 19. Timer module; 20. Interaction module; 21. Display panel; 22. Power module; 23. Flameout protection module; 24. Flame detection module; 111. Anti-dry burning probe; 112. Support part; 200. Drive assembly. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] Figure 1 This is a schematic diagram of a stove anti-dry-burning control device provided in an embodiment of the present invention. This embodiment is applicable to gas stoves equipped with anti-dry-burning function. Figure 2 This is a structural schematic diagram of a stove with an anti-dry-burning control device provided in an embodiment of the present invention. Figure 3 This is an exploded view of a stove with an anti-dry-burning control device provided in an embodiment of the present invention.

[0035] See Figure 2 and Figure 3As shown, the stove of this application includes a pot rack 1, a drip tray 2, a burner 3, an anti-dry-burning module 11, a burner head 4, a stove base 5, and a stove panel 13. The pot rack 1 supports the pot to be tested, with the bottom surface of the pot abutting against the upper surface of the pot rack 1. The pot rack 1 is placed above the drip tray 2, which supports and limits the pot rack. The upper part of the burner head 4, the lower part of the drip tray 2, and the stove panel 13 are fixedly connected by fasteners; the lower part of the burner head 4 is fixedly connected to the stove base 5 by fasteners. The anti-dry-burning module 11 includes an anti-dry-burning probe 111, which is disposed in the hollow part of the burner head of the burner 3. This anti-dry-burning probe 111 can use a temperature sensor and / or a thermistor to detect the bottom temperature of the pot to be tested. In this embodiment, according to the material, the cookware to be tested includes, but is not limited to, any of the following: non-metallic cookware and metal cookware, wherein non-metallic cookware includes, but is not limited to: earthenware pot, stone pot, ceramic pot or glass pot; metal pot includes, but is not limited to: aluminum pot, iron pot or stainless steel pot; according to the shape, the cookware to be tested includes, but is not limited to: flat-bottomed pot or round-bottomed pot; according to the function, the cookware to be tested includes, but is not limited to: wok, steamer or stew pot.

[0036] See Figure 1 As shown, the control device of this application includes: a detection module 100, a drive component 200, and a control module 300.

[0037] The detection module 100 is used to acquire static and dynamic detection data of the cookware under test. In this embodiment, the static detection data is the data fed back after performing static feature detection on the cookware under test, such as shape, material, or type. The dynamic detection data is the data fed back after detecting the motion state of the cookware under test. In this embodiment, different types of sensors or other detection elements can be set at the bottom surface of the cookware facing the cookware under test to collect detection data at the corresponding location. Typically, the detection module 100 includes, but is not limited to, at least one of the following: an image sensor, an ultrasonic sensor, a displacement sensor, a strain force detection sensor, an acceleration sensor, a capacitance sensor, a resistance sensor, or a magnetoelectric sensor.

[0038] A drive assembly 200 is used to drive the anti-dry-burning module 11 to move. In this embodiment, the drive assembly 200 is connected to the anti-dry-burning module 11 to drive the anti-dry-burning module 11 to move in a direction toward or away from the bottom surface of the cookware under test. For example, when the drive assembly 200 drives the anti-dry-burning module 11 to move in a direction toward the bottom surface of the cookware under test, if the anti-dry-burning probe 111 of the anti-dry-burning module 11 comes into contact with the bottom surface of the cookware, the drive assembly 200 stops driving; when the drive assembly 200 drives the anti-dry-burning module 11 to move in a direction away from the bottom surface of the cookware under test, the drive assembly 200 can increase the distance between the anti-dry-burning probe 111 and the bottom surface of the cookware according to calibration data, or directly drive the anti-dry-burning probe 111 to be hidden inside the burner.

[0039] The control module 300 is connected to the detection module 100, the drive component 200, and the anti-dry-burn module 11, respectively. It is used to send drive control signals to the drive component 200 based on static and dynamic detection data, causing the drive component 200 to drive the anti-dry-burn module 11 to move towards or away from the cookware under test, and / or to adjust the operating state and protection temperature threshold of the anti-dry-burn module 11 based on the static and dynamic detection data. The operating state includes, but is not limited to: turning off the anti-dry-burn module 11, and maintaining the anti-dry-burn module 11 to perform temperature measurement on the bottom of the cookware under test. The protection temperature threshold is the temperature set based on the temperature measurement data of the anti-dry-burn module 11 to trigger the anti-dry-burn protection action (such as power off).

[0040] In this embodiment, a drive control signal is sent to the drive component 200 based on static detection data and dynamic detection data, causing the drive component 200 to drive the anti-dry-burning module 11 to move in a direction toward or away from the pot to be tested. This includes: identifying the cooking scenario based on the static detection data and dynamic detection data, and determining the drive control signal based on the cooking scenario.

[0041] Specifically, during the cooking process, the detection module 100 feeds back static detection data and dynamic detection data to identify the cookware material, shape, or type, and identifies the cooking scenario based on at least one of the cookware material, shape, or type, as well as the dynamic detection data. If the current cooking scenario is a deformable cookware cooking scenario (e.g., an aluminum pot), the control drive component 200 drives the anti-dry-burn probe 111 to rise and contact the bottom of the cookware; if the type of cookware to be tested is a non-deformable cookware cooking scenario (e.g., a clay pot), the movement of the cookware is identified based on an ultrasonic sensor, displacement sensor, strain detection sensor, or acceleration sensor. When the type of cookware to be tested is a non-deformable cookware cooking scenario and the cookware to be tested has no continuous movement, the current cooking scenario is determined to be clay pot cooking, the control drive component 200 drives the anti-dry-burn probe 111 to contact the bottom of the cookware, and the protection temperature threshold of the anti-dry-burn module 11 is increased; when the type of cookware to be tested is a non-deformable cookware cooking scenario and the cookware to be tested has continuous movement, the current cooking scenario is determined to be tossing cooking, and the control drive component 200 drives the anti-dry-burn probe 111 to descend into the burner 3. By automatically identifying static and dynamic detection data of cookware, the position, working status, and protection temperature threshold of the anti-dry-burning module are adjusted based on different detection data. This solves the problem that existing anti-dry-burning modules are difficult to be compatible with different cookware, which can easily lead to false triggering of the anti-dry-burning protection or damage to the temperature sensing element due to collision. This improves the accuracy of the temperature sensing protection of the anti-dry-burning module, reduces false judgments, enhances the applicability of the anti-dry-burning module to different cookware, improves the anti-dry-burning effect, avoids false triggering or damage to the anti-dry-burning module due to collision, improves the user experience, and extends the service life.

[0042] Optionally, the control module 300 of the present invention is configured to adjust the working state and protection temperature threshold of the anti-dry-burning module according to at least one of the cookware material, cookware shape, or cookware type, and dynamic detection data, specifically including the following control strategies:

[0043] In some embodiments, the control module 300 is configured to: identify cooking scenarios based on material detection data, shape detection data, and dynamic detection data, and adjust the working state and protection temperature threshold of the anti-dry-burning module according to the cooking scenarios. Specifically, when the stove is working, the control module 300 can determine the material of the pot based on the material monitoring data. Since the bottom temperature of pots made of different materials varies during cooking, the control module 300 will adjust the anti-dry-burning protection temperature threshold according to the material of the pot. For example, if the material of the pot to be tested is detected to be non-metallic, the bottom temperature of the non-metallic pot will be higher during cooking due to its poor thermal conductivity, so the anti-dry-burning protection temperature threshold needs to be increased; while the thermal conductivity of the metal pot is better, and the temperature difference between the bottom temperature of the metal pot and the temperature of the food in the pot is smaller during cooking. If the material of the pot to be tested is detected to be metal, the anti-dry-burning protection temperature threshold needs to be lowered to avoid misjudgment by the anti-dry-burning module 11. Simultaneously, the control module 300 determines the shape of the cookware and whether it is moving based on shape monitoring data and dynamic detection data. If the cookware is moving, it determines that the user is moving the cookware, such as flipping or transferring it, and then deactivates the anti-dry-burning module 11 to prevent the cookware from colliding with the anti-dry-burning module 11 and damaging it. If the control module 300 determines that the cookware is stationary, the anti-dry-burning module 11 will activate and press against the bottom of the cookware to detect the temperature of the bottom of the cookware and prevent dry burning.

[0044] In other embodiments, the control module 300 is configured to: identify the cooking scenario based on material detection data and dynamic detection data, and adjust the working state and protection temperature threshold of the anti-dry-burning module according to the cooking scenario. Specifically, when the stove is working, the control module 300 can determine the material of the pot based on the material monitoring data. Since the bottom temperature of pots made of different materials varies during cooking, the control module 300 will adjust the anti-dry-burning protection temperature threshold according to the material of the pot. For example, if the material of the pot to be tested is detected to be non-metallic, the bottom temperature of the non-metallic pot will be higher during cooking due to its poor thermal conductivity, so the anti-dry-burning protection temperature threshold needs to be increased. On the other hand, the thermal conductivity of the metal pot is better, and the temperature difference between the bottom temperature of the metal pot and the temperature of the food in the pot is smaller during cooking. If the material of the pot to be tested is detected to be metal, the anti-dry-burning protection temperature threshold needs to be lowered to avoid misjudgment by the anti-dry-burning module 11. At the same time, the control module 300 determines whether the pot is moving based on the dynamic detection data. If the cookware is in motion, the system determines that the user is moving the cookware, such as flipping or transferring it. In this case, the anti-dry-burning module 11 is deactivated to prevent the cookware from colliding with and damaging the anti-dry-burning module 11. If the control module 300 determines that the cookware is stationary, the anti-dry-burning module 11 will activate and press against the bottom of the cookware to detect the temperature of the bottom of the cookware and prevent dry burning.

[0045] In some embodiments, the control module 300 is configured to: identify cooking scenarios based on type detection data and dynamic detection data, and adjust the working state and protection temperature threshold of the anti-dry-burning module according to the cooking scenarios. Specifically, when the stove is working, the control module 300 can identify the material and shape of the pot based on the type monitoring data of the pot. Since the bottom temperature of pots made of different materials varies during cooking, the control module 300 will adjust the anti-dry-burning protection temperature threshold according to the material of the pot. For example, if the material of the pot to be tested is detected to be non-metallic, the bottom temperature of the non-metallic pot will be higher during cooking due to its poor thermal conductivity, so the anti-dry-burning protection temperature threshold needs to be increased; while the thermal conductivity of the metal pot is better, and the temperature difference between the bottom temperature of the metal pot and the temperature of the food in the pot is smaller during cooking. If the material of the pot to be tested is detected to be metal, the anti-dry-burning protection temperature threshold needs to be lowered to avoid misjudgment by the anti-dry-burning module 11. Simultaneously, the control module 300 determines the shape of the cookware and whether it is moving based on type monitoring data and dynamic detection data. If the cookware is moving, it determines that the user is moving the cookware, such as flipping or transferring it, and then deactivates the anti-dry-burning module 11 to prevent the cookware from colliding with and damaging the anti-dry-burning module 11. If the control module 300 determines that the cookware is stationary, the anti-dry-burning module 11 will activate and press against the bottom of the cookware to detect the temperature of the bottom of the cookware and prevent dry burning.

[0046] Optionally, the control module 300 of the present invention is further configured to: identify, based on at least one of the cookware material, cookware shape, or cookware type, and dynamic detection data, a cooking scenario involving easily deformable cookware, a cooking scenario involving non-easily deformable cookware, or a tossing cooking scenario; and match corresponding drive control signals to the cooking scenarios involving easily deformable cookware, the cooking scenarios involving non-easily deformable cookware, and the tossing cooking scenario, specifically including the following control strategies:

[0047] In some embodiments, the control module 300 is configured to: determine whether the cookware to be tested is a deformable cookware based on the cookware material or cookware type; and when the cookware to be tested is a deformable cookware, control the drive component 200 to drive the anti-dry-burning module 11 to move in the direction toward the cookware to be tested until the anti-dry-burning module 11 comes into contact with the bottom of the cookware to be tested; and / or, when the cookware type is a non-deformable cookware and continuous movement of the cookware is detected based on dynamic detection data, drive the anti-dry-burning module 11 to move in the direction away from the cookware to be tested.

[0048] Optionally, the detection module 100 includes: a motion detection unit for collecting dynamic detection data of the cookware under test; the detection module 100 also includes at least one of the following: a material detection unit, a shape detection unit, and a type detection unit. The material detection unit is used to acquire material detection data of the cookware under test; the shape detection unit is used to acquire shape detection data of the cookware under test; and the cookware type detection unit is used to acquire type detection data of the cookware under test.

[0049] Optionally, the shape detection unit includes, but is not limited to, ultrasonic sensors or image sensors. The number of ultrasonic sensors is greater than or equal to two. Preferably, three or four ultrasonic sensors are provided. Multiple ultrasonic sensors are evenly arranged on the surface of the drip tray facing the cookware, and the projection of the ultrasonic sensors onto the cookware panel falls within the inner circumferential range of the pot rack. The control module is configured to determine the shape of the cookware based on the shape detection data. Specifically, during cooking, the ultrasonic sensors emit ultrasonic waves, identify the real-time distance from the bottom surface of the cookware supported by the pot rack, and identify the shape of the cookware based on the distance and changes in distance at various points in space.

[0050] Optionally, the material testing unit includes at least one of the following: an electrical testing unit, an optical testing unit, and a thermal conductivity testing unit.

[0051] The electrical detection unit is used to detect the conductivity of the cookware under test. Typically, the electrical detection unit includes, but is not limited to, a capacitance sensor, a resistance sensor, or a magnetoelectric sensor. For example, taking a capacitance sensor as an example, the capacitance sensor is located at the probe head of the anti-dry-burning module 11. The capacitance sensor and the bottom surface of the cookware under test can form a capacitor plate. The capacitance calculation formula is C = εS / (4πkd), where ε represents the dielectric constant (for a parallel plate capacitor, ε is the dielectric constant of the medium between the plates), S represents the area of ​​the capacitor plates facing each other, d represents the distance from the capacitor plate (i.e., the bottom surface of the cookware), and k represents the electrostatic constant. The control module of this application is also configured to: determine the resistance and capacitance values ​​of the cookware under test based on the material detection data collected by the electrical detection unit, and determine the cookware material based on the resistance and capacitance values. Specifically, the presence or absence of capacitance can be used to determine whether the cookware is made of metal (capacitance detected) or non-metallic material (capacitance not detected). Furthermore, the specific metallic material (such as aluminum alloy or iron alloy) can be determined by the magnitude of the detected capacitance value.

[0052] An optical detection unit is used to detect the emissivity of the cookware under test for a specific light wave. Typically, the optical detection unit includes, but is not limited to, a radiometer or an infrared radiation detection unit. For example, taking an infrared radiation detection unit as an example, the infrared radiation detection module is positioned on the outer periphery of the pot rack 1, abutting against the upper surface of the drip tray 2 or the panel 13, and detects the emissivity of the bottom surface of the pot. The control module 300 is also configured to: determine the emissivity of the cookware under test based on the material detection data collected by the optical detection unit, and determine the material of the cookware based on the emissivity. Specifically, the optical detection module can be positioned on the outer periphery of the pot rack 1, abutting against the upper surface of the drip tray 2 or the panel 13, and the material of the cookware can be determined by receiving and analyzing the magnitude of the emissivity of the bottom surface of the pot. For example, when the emissivity of the bottom surface of the cookware under test is less than the emissivity threshold (e.g., 0.6), the cookware under test is determined to be a non-metallic pot; when the emissivity of the bottom surface of the cookware under test is greater than or equal to the emissivity threshold (e.g., 0.6), the cookware under test is determined to be a metallic pot.

[0053] The thermal conductivity detection unit is used to detect the temperature change of the bottom of the cookware. Typically, the thermal conductivity detection unit includes, but is not limited to, a temperature sensor, a thermocouple sensor, or a thermistor sensor. For example, taking a temperature sensor as an example, the temperature sensor is positioned on the outer periphery of the pot rack 1, abutting against the water tray 2 or the upper surface of the panel 13, to detect the temperature change of the bottom of the pot. The control module 300 is also configured to: determine the thermal conductivity of the cookware under test based on the material detection data collected by the thermal conductivity detection unit, and determine the material of the cookware based on the thermal conductivity. Specifically, the thermal conductivity detection unit measures the temperature change of the bottom of the cookware using a temperature probe, then analyzes the temperature change to determine the thermal conductivity of the cookware, thereby determining the material of the cookware. For example, when the thermal conductivity is less than a critical value, the cookware under test is determined to be a non-metallic cookware; when the thermal conductivity is greater than or equal to the critical value, the cookware under test is determined to be a metallic cookware.

[0054] Optionally, the motion detection unit includes at least one of the following: an ultrasonic sensor, a displacement sensor, a strain detection sensor, or an acceleration sensor. The motion detection unit can identify at least one of the following: the real-time distance from the bottom surface of the pot supported by the pot rack, the pressure exerted on the pot rack 1, and the acceleration of the pot, and based on at least one of the following: the real-time distance from the bottom surface of the pot supported by the pot rack, the pressure exerted on the pot rack 1, and the acceleration of the pot, the motion of the pot and the shape of the pot.

[0055] The system employs one or more ultrasonic sensors. When the number of ultrasonic sensors is two or more, multiple ultrasonic sensors are evenly arranged within the inner circumferential range of the pot rack 1 to identify the real-time distance between the bottom of the pot and the transmitting end of the ultrasonic sensor. The control module is also configured to determine the pot's movement and shape based on the real-time distances collected by at least two ultrasonic sensors. Specifically, during the detection process, the ultrasonic sensors emit ultrasonic waves to identify the real-time distance from the bottom surface of the pot supported by the pot rack, and identify the pot's movement and shape based on the distance and changes at various points in space. For example, if the real-time distance between the bottom surface of the pot and the ultrasonic sensor continuously changes, it is determined that the pot is moving; if the real-time distance between the bottom surface of the pot and the ultrasonic sensor does not change for a long time (e.g., within 2 seconds), it is determined that the pot is stationary.

[0056] Displacement sensors are used to detect the displacement of the bottom of the cookware. The displacement sensors are located at the contact point between the feet of the cookware support 1 and the drip tray 2, and the number of displacement sensors matches the number of feet on the cookware support 1. The control module 300 is also used to determine the cookware's movement based on the real-time displacement collected by the displacement sensors, and to determine the cooking scenario based on the cookware's movement. Specifically, during the detection process, the displacement sensors identify the real-time displacement of the cookware's bottom surface and identify the cookware's movement based on this real-time displacement. For example, if the bottom surface of the cookware under test continuously moves back and forth, it is determined that the user is tossing the cookware.

[0057] A strain gauge sensor is used to detect the pressure exerted on the cookware by the pot rack 1. The pressure exerted on the strain gauge sensor by the pot rack 1 can indirectly reflect the movement of the cookware. The strain gauge sensor is located at the contact point between the foot piece of the pot rack 1 and the drip tray 2, and the number of strain gauge sensors is consistent with the number of foot pieces of the pot rack 1. The control module 300 is also used to determine the movement of the cookware based on the pressure data collected by the strain gauge sensor, and to determine the cooking scenario based on the movement of the cookware. Specifically, during the detection process, the strain gauge sensor detects the pressure exerted on the strain gauge sensor by the pot rack 1, and identifies the movement of the cookware based on changes in the pressure data. For example, if the pressure exerted on the strain gauge sensor is greater than the weight of the pot rack 1, and the pressure remains constant for a long time, it is determined that the cookware is placed on the pot rack 1 and is stationary; if the pressure exerted on the strain gauge sensor is equal to the weight of the pot rack 1, it is determined that there is no cookware on the pot rack 1.

[0058] An accelerometer is used to detect the acceleration of the cookware. The accelerometer is positioned at the point where the feet of the pot support 1 contact the drip tray 2, and the number of accelerometers matches the number of feet on the pot support 1. The control module 300 is also used to determine the pot's movement based on its acceleration and to determine the cooking scenario based on the pot's movement. Specifically, during the detection process, the accelerometer detects the acceleration of the pot, and the control module 300 identifies the pot's movement based on the acceleration. For example, if the accelerometer detects a continuous change in the pot's acceleration, it determines that the user is tossing the pot.

[0059] Optionally, the type detection unit may be a radio frequency (RF) detection unit. The control module of the present invention is configured to determine the cookware type based on the type detection data. Specifically, the RF detection unit includes an identification unit and an editable identification unit; the editable identification unit is disposed on the cookware to be tested and is used to store at least one of the cookware material, cookware shape, or cookware type, and the stored data is editable data; the identification unit is communicatively connected to the control module 300, or integrated with the control module 300. The editable identification unit includes a near-field radio frequency identification (NFC) tag, which may be disposed on the cookware handle, pot handle, or auxiliary lug; the identification unit includes a NFC reader, which can identify at least one of the cookware material, cookware shape, or cookware type information based on the NFC tag.

[0060] Figure 4 This is a schematic diagram of the structure of a driving component provided in an embodiment of the present invention. Figure 5 This is an exploded view of a driving component provided in an embodiment of the present invention. See also... Figure 4 and Figure 5 As shown, the drive assembly 200 includes a drive motor 6 and a transmission mechanism. The drive motor 6 is connected to the control module 18 and is used to receive drive control signals issued by the control module 18 and perform forward or reverse rotation according to the drive control signals. The transmission mechanism has a crank part 7 and a connecting rod part 8. The crank part 7 is connected to the drive motor 6. The first end of the connecting rod part 8 is hinged to the crank part 7, and the second end of the connecting rod part 8 is hinged to the anti-dry-burning module 11. The crank part 7 rotates synchronously with the drive motor 6 and drives the anti-dry-burning module 11 to move in the direction toward or away from the pot to be tested via the connecting rod part 8. The control module 18 is configured to: acquire the crank radius and connecting rod length of the transmission mechanism, determine the moving distance of the anti-dry-burning module 11 based on static detection data and dynamic detection data, determine the crank angle based on the moving distance, crank radius and connecting rod length, and issue drive control signals based on the crank angle.

[0061] Specifically, see Figure 4 and Figure 5As shown, when the drive motor 6 rotates forward or reverse, it drives the crank part 7 and the connecting rod part 8 to move, thereby achieving displacement of the anti-dry-burning probe 11 in the direction toward or away from the cookware (e.g., vertical direction). The formula for calculating the displacement of the anti-dry-burning probe 11 is:

[0062] x=R(1-cosα)+Rλ(1-cos2α) / 4

[0063] Where x represents the displacement of the probe, R is the crank radius, α is the crank angle, and λ is the ratio of the crank radius R to the connecting rod length L (R / L). The crank radius is the distance from the connection point between the crank part 7 and the drive motor 6 to the connection point between the crank part 7 and the connecting rod part 8. The control module 18 can determine the distance that the anti-dry-burning module 11 needs to move based on static and dynamic detection data, and control the drive motor 6 according to the above formula to move the anti-dry-burning module 11 to a specific position.

[0064] See Figure 4 and Figure 5 As shown, the drive assembly 200 also includes a fixing part 9, which is hinged to the second end of the connecting rod part 8. The outer periphery of the fixing part 9 forms a nested gap with the side wall of the hollow part of the burner head 3 to lock and fix the anti-dry-burning module 11, so that the anti-dry-burning module 11 can move in a direction toward or away from the pot to be tested. In this embodiment, the fixing part 9 includes two cover plates arranged opposite to each other, and the anti-dry-burning module 11 is fixed in the fixing hole formed by the engagement of the two cover plates.

[0065] Figure 6 This is an exploded view of the drive assembly and furnace head provided in an embodiment of the present invention. Figure 7 This is a schematic diagram illustrating the structural arrangement of the drive assembly and the furnace head provided in an embodiment of the present invention. (Combined with...) Figures 4 to 7 As shown, the fixing part 9 is hinged to the second end of the connecting rod part 8 and locked to fix the anti-dry-burning module 11, so that the anti-dry-burning module 11 can be moved upward or downward by the connecting rod part 8. The fixing part 9 includes a fixing hole and several fixing feet. The fixing hole is used to fix the anti-dry-burning module 11. The fixing feet are arranged radially on the outside of the fixing hole and form a nested gap fit with the side wall of the hollow part 10 of the burner head, thereby ensuring that the anti-dry-burning module 11 will not shift horizontally while moving up and down.

[0066] See Figures 4 to 7 The anti-dry-burning module 11 also includes a support part 112, which is locked and fixed to the fixing part 9, so that the anti-dry-burning probe 111 is placed in the hollow part 10 of the burner head. Specifically, the fixing part 9 is formed by two cover plates to form a fixing hole, the size of which is interference-fitted with the support part 112, so that the support part 112 is locked and fixed in the fixing part 9.

[0067] Figure 8This is a schematic diagram of another stove anti-dry-burning control device provided in an embodiment of the present invention.

[0068] refer to Figure 8 As shown, the stove anti-dry-burning control device of this application further includes: a timer module 19 and / or an interaction module 20. The timer module 19 is used to configure the timer duration, wherein the timer duration represents the cooking time of the stove; the interaction module 20 is used to obtain the working mode of the stove and display the corresponding data according to the working module. The working mode includes at least one of the following: timer mode, probe lifting and display mode, and anti-dry-burning trigger mode.

[0069] refer to Figure 8 The control module 300 is connected to the timing module 19 and the interaction module 20. The timing module 19 configures the timing duration, and the control module 300 obtains the timing duration and controls the stove to turn off according to the timing duration. The control module 300 outputs the stove's working mode information to the interaction module 20, and the interaction module 20 displays the stove's working mode according to the working mode information.

[0070] refer to Figure 2 The timing module 19 includes a timing encoder 14 and a timing encoder knob 15. The timing encoder 14 is sleeved on the valve body 16 and located below the panel 13, while the timing encoder knob 15 is sleeved on the upper part of the timing encoder 14 and located above the panel 13. The power knob is inserted into the top of the valve stem of the valve body 16 and located above the timing encoder knob 15. Both the valve body 16 and the timing encoder 14 are connected to the control module 300. The interaction module 20 includes a display panel 21, which abuts against the panel 13 and is connected to the control module 300. The upper surface of the display panel 21 is provided with a display screen. The display screen on the display panel 21 can display different data according to different modes. In the timing mode, the display panel 21 is used to display the remaining time in minutes, and the remaining time is displayed in seconds within 1 minute. In the probe lifting display mode, the display panel 21 can be used to display the height of the anti-dry burning probe 11 relative to the reference point, as well as the reminder display of the highest and lowest positions. In the anti-dry burning trigger mode, the display panel 21 can be used to display anti-dry burning trigger warning information (such as graphic warnings or light warnings).

[0071] refer to Figure 8 As shown, the stove anti-dry-burning control device of this application also includes: a power module 22, which is used to supply power to the control module 300 and the drive motor 6.

[0072] refer to Figure 8As shown, the stove anti-dry-burning control device of this application further includes: a flameout protection module 23 and a flame detection module 24. The flameout protection module 23 and the flame detection module 24 are respectively connected to the control module 300. Under the control of the control module 300, the flameout protection module 23 performs flameout protection on the stove; the flame detection module 24 is used to detect the flame detection data of the stove and send the flame detection data to the control module 300. The control module 300 can determine whether ignition is successful or whether flameout is successful based on the flame detection data.

[0073] Based on the inventive concept of any of the above embodiments, this invention also provides a stove anti-dry-burning control method, which is implemented based on the above stove anti-dry-burning control device.

[0074] See Figure 2 and Figure 3 As shown, the stove of this application includes a pot rack 1, a water tray 2, a burner 3 and an anti-dry-burning module 11. The pot rack 1 is used to support the pot to be tested.

[0075] Figure 9 This is a flowchart illustrating a method for preventing dry burning in a stove, as provided in an embodiment of the present invention. Figure 9 As shown, the stove anti-dry-burning control method of this application specifically includes the following steps:

[0076] S1: Obtain static and dynamic test data of the cookware to be tested.

[0077] S2: Based on static and dynamic detection data, send drive control signals to the drive component to drive the anti-dry-burning module to move in a direction toward or away from the pot to be tested, and / or adjust the working state and protection temperature threshold of the anti-dry-burning module based on static and dynamic detection data.

[0078] Figure 10 A flowchart illustrating another method for preventing dry burning in a stove, provided in an embodiment of the present invention. (See reference) Figure 10 The user rotates the fire control knob to ignite the stove. A thermocouple checks if ignition is successful, and the anti-dry-burn mode is activated by default upon successful ignition. Next, the heat conduction detection unit and ultrasonic sensor determine the material, shape, and movement of the cookware. If the cookware moves continuously, the anti-dry-burn probe 111 descends into the burner 3. If the cookware does not move continuously and is non-metallic, the anti-dry-burn protection temperature threshold is increased by Δt. If the cookware does not move continuously and is metallic, the drive motor 6 moves the anti-dry-burn probe 111 to contact the bottom of the cookware. For round-bottomed cookware, the anti-dry-burn probe 111 does not need to move; for flat-bottomed cookware, the probe 111 needs to rise to contact the bottom. If the anti-dry-burn high-temperature protection is triggered, the stove shuts off; if it is not triggered, the stove shuts off when the timer ends.

[0079] Figure 11 A flowchart illustrating another method for preventing dry burning in a stove, provided as an embodiment of the present invention. (See reference) Figure 11 The user rotates the flame knob to ignite the stove. A thermocouple checks if ignition is successful, and the anti-dry-burn mode is activated by default upon successful ignition. Next, the electrical detection unit and displacement sensor determine the cookware material and its movement. If the cookware is aluminum, the drive motor 6 moves the anti-dry-burn probe 111 to contact the bottom of the cookware. If the cookware moves continuously and is not aluminum, the anti-dry-burn probe 111 descends into the burner 3. If the cookware does not move continuously and is non-metallic, the anti-dry-burn protection temperature threshold is increased by Δt. If the cookware does not move continuously and is a metal other than aluminum, the drive motor 6 moves the anti-dry-burn probe 111 to contact the bottom of the cookware. If the anti-dry-burn high-temperature protection is triggered, the stove shuts off; if it is not triggered, the stove shuts off when the timer ends.

[0080] Figure 12 A flowchart illustrating another method for preventing dry burning in a stove, provided as an embodiment of the present invention. (See reference) Figure 12 The user rotates the fire control knob to ignite the stove. A thermocouple checks if ignition is successful, and the anti-dry-burn mode is activated by default upon successful ignition. Next, the near-field radio frequency identification (RFID) device and accelerometer determine the type of cookware and the cooking action. If the cookware is a flat-bottomed aluminum pot, the drive motor 6 raises the anti-dry-burn probe 111 to contact the bottom of the pot. If the cookware is not flat-bottomed aluminum and there is continuous movement, the anti-dry-burn probe 111 descends into the burner 3. If the cookware has no continuous movement and is a round-bottomed iron pot, the drive motor 6 raises the anti-dry-burn probe 111 to contact the bottom of the pot, and the anti-dry-burn module 11 operates normally. If the cookware has no continuous movement and is a clay pot, the anti-dry-burn protection temperature threshold is increased by Δt. If the anti-dry-burn high-temperature protection is triggered, the stove shuts off; if the anti-dry-burn high-temperature protection is not triggered, the stove shuts off when the timer ends.

[0081] This invention also provides a stove, including the stove anti-dry-burning control device described above, which has the corresponding functional modules and beneficial effects of the stove anti-dry-burning control device described above, and the same parts will not be described again.

[0082] In this embodiment, the cooktop includes, but is not limited to: gas cooktops, integrated cooktops, and other cooking appliances with burners.

[0083] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0084] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A stove anti-dry-burning control device, the stove comprising a pot rack, a drip tray, a burner, and an anti-dry-burning module, wherein the pot rack is used to support the pot to be tested, characterized in that, The control device includes: The detection module is used to acquire static and dynamic detection data of the cookware under test; A driving component is used to drive the anti-dry-burning module to move; The control module is connected to the detection module, the drive component, and the anti-dry-burning module respectively. It is used to send drive control signals to the drive component according to the static detection data and the dynamic detection data, so that the drive component drives the anti-dry-burning module to move in a direction toward or away from the pot to be tested, and / or adjust the working state and protection temperature threshold of the anti-dry-burning module according to the static detection data and the dynamic detection data. The detection module includes: a motion detection unit for collecting dynamic detection data of the cookware under test; the detection module also includes at least one of the following: a material detection unit, a shape detection unit, and a type detection unit; the control module is further configured to: identify a cooking scenario for easily deformable cookware based on at least one of the cookware material, cookware shape, or cookware type, and the dynamic detection data, and match the corresponding drive control signal to the cooking scenario for easily deformable cookware; if the current cooking scenario is the cooking scenario for easily deformable cookware, then control the drive component to drive the anti-dry-burning module to rise and abut against the bottom of the cookware.

2. The stove anti-dry-burning control device according to claim 1, characterized in that, The material detection unit is used to acquire the material detection data of the cookware to be tested; the shape detection unit is used to acquire the shape detection data of the cookware to be tested; the cookware type detection unit is used to acquire the type detection data of the cookware to be tested. The control module is configured to: determine the cookware material based on the material detection data, and / or determine the cookware shape based on the shape detection data, and / or determine the cookware type based on the type detection data; The control module is further configured to: identify a non-deformable cookware cooking scenario or a tossing cooking scenario based on at least one of the cookware material, the cookware shape, or the cookware type, and the dynamic detection data, and match the corresponding drive control signal to the non-deformable cookware cooking scenario and the tossing cooking scenario.

3. The stove anti-dry-burning control device according to claim 2, characterized in that, The material detection unit includes at least one of the following: an electrical detection unit, an optical detection unit, and a thermal conductivity detection unit; The control module is further configured to: determine the resistance and capacitance value of the cookware under test based on the material detection data collected by the electrical detection unit, and determine the material of the cookware based on the resistance and capacitance value; And / or, The emissivity of the cookware under test is determined based on the material detection data collected by the optical detection unit, and the material of the cookware is determined based on the emissivity. And / or, The thermal conductivity of the cookware to be tested is determined based on the material detection data collected by the thermal conductivity detection unit, and the material of the cookware is determined based on the thermal conductivity.

4. The stove anti-dry-burning control device according to claim 2, characterized in that, The motion detection unit is configured to identify at least one of the following: the real-time distance from the bottom of the cookware, the pressure exerted on the cookware support, and the acceleration of the cookware. The control module is also configured to determine the movement and shape of the cookware based on at least one of the real-time distance from the bottom surface of the cookware, the pressure borne by the cookware support, or the acceleration of the cookware.

5. The stove anti-dry-burning control device according to claim 1, characterized in that, The driving component includes: A drive motor, connected to the control module, is used to receive the drive control signal and perform forward or reverse rotation according to the drive control signal; The transmission mechanism includes a crank portion and a connecting rod portion. The crank portion is connected to the drive motor. The first end of the connecting rod portion is hinged to the crank portion, and the second end of the connecting rod portion is hinged to the anti-dry-burning module. The crank portion rotates synchronously with the drive motor, and the connecting rod portion drives the anti-dry-burning module to move in a direction toward or away from the pot to be tested. The control module is configured to: acquire the crank radius and connecting rod length of the transmission mechanism; determine the moving distance of the anti-dry-burning module based on the static detection data and the dynamic detection data; determine the crank angle based on the moving distance, the crank radius, and the connecting rod length; and send the drive control signal based on the crank angle.

6. The stove anti-dry-burning control device according to claim 5, characterized in that, The drive assembly also includes a fixing part, which is hinged to the second end of the connecting rod part, and the outer periphery of the fixing part forms a nested gap fit with the side wall of the hollow part of the burner head to lock and fix the anti-dry burning module, so that the anti-dry burning module can move in the direction toward or away from the pot to be tested.

7. The stove anti-dry-burning control device according to claim 6, characterized in that, The anti-dry-burning module includes: an anti-dry-burning probe and a support; The anti-dry-burning probe is installed in the hollow part of the burner head; The support portion is locked and fixed to the fixing portion.

8. The stove anti-dry-burning control device according to any one of claims 1-7, characterized in that, Also includes: Timed module and / or interactive module; The timing module is used to configure the timing duration; The interaction module is used to obtain the working mode of the stove and display the corresponding data according to the working mode; The operating modes include at least one of the following: timed mode, probe lifting and display mode, and anti-dry burning trigger mode.

9. A method for controlling dry burning in a cooker, the cooker comprising a pot rack, a drip tray, a burner, and an anti-dry burning module, wherein the pot rack is used to support the pot to be tested, characterized in that... The control method includes: Obtain static and dynamic detection data of the cookware under test; Based on the static detection data and the dynamic detection data, a drive control signal is sent to the drive component to drive the anti-dry-burning module to move in a direction toward or away from the pot to be tested, and / or, based on the static detection data and the dynamic detection data, the working state and protection temperature threshold of the anti-dry-burning module are adjusted. Based on at least one of the cookware material, cookware shape, or cookware type, and the dynamic detection data, identify the cooking scenario of the easily deformable cookware, and match the corresponding drive control signal to the cooking scenario of the easily deformable cookware; If the current cooking scenario is the easily deformable cookware cooking scenario, then control the drive component to drive the anti-dry-burning module to rise and abut against the bottom of the cookware.

10. A stove, characterized in that, include: A pot rack, a drip tray, a burner, an anti-dry-burning module, and a stove anti-dry-burning control device according to any one of claims 1 to 8.

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