Burner for gas stove, gas stove and gas stove control method

Abstract

The present invention relates to a burner for a gas stove, comprising: a base having an inner cavity and an outer cavity; an inner ring flame cover; and a mixing plate having a plurality of concentrically spaced annular bodies, wherein at least some of the adjacent annular bodies form an upwardly open gas channel, and the gas channels are at least two and both are connected to the outer cavity; an outer ring flame cover, the number of which matches the number of gas channels formed on the mixing plate, each outer ring flame cover covering the corresponding gas channel opening to form an outer ring gas mixing chamber with the outer cavity, the outer ring flame cover having a second flame hole connected to the outer ring gas mixing chamber; and an outer ring flame cover lifting mechanism for driving at least one outer ring flame cover to independently rise and fall relative to the annular body. Also disclosed are a gas stove and a control method for the gas stove. The burner can provide flames of different heights for pots of different shapes, thereby maintaining good contact characteristics at all parts of the pot.

Description

Technical Field

[0001] The present invention relates to the technical field of household kitchen appliances, and in particular to a burner for a gas stove, a gas stove and a control method for the gas stove. Background Art

[0002] Gas stoves are commonly used in daily life, and burners are important components of gas stoves. In order to avoid the safety hazard caused by the occurrence of dry-burning of pots, existing burners are usually equipped with temperature sensors for detecting dry-burning of pots.

[0003] For example, the Chinese utility model patent with patent number CN202021868536.2 (application publication number:: CN213334367U) discloses an anti-dry burning stove burner, including a burner head, an ignition distributor seat, an inner ring fire cover, an outer ring fire cover and a telescopic temperature sensor. The telescopic temperature sensor includes a temperature sensing head and a rod, and also includes a gas guide device. The circular central gas cavity of the burner head is inserted into the central air inlet cavity of the ignition distributor seat, and the central external interface is inserted into the outer wall plate of the central air inlet cavity. The outer ring wall plate of the circular central gas cavity supports the lower end of the outer ring wall plate of the central air inlet cavity; the external interface is inserted into the outer ring air inlet pipe, and the outer ring gas cavity supports the lower end of the outer ring air inlet pipe; the gas guide device cooperates with the upper end of the outer ring air inlet pipe and the air outlet end of the gas guide cavity; the rod of the telescopic temperature sensor is fixed in the center hole of the circular central gas cavity, and is connected to the inner ring wall plate of the circular central gas cavity, and the head extends from the center hole of the inner ring fire cover.

[0004] When current burners are produced, the optimal operating distance between the flame and the bottom of the pot is usually designed according to the frying pan. The current mainstream burners adopt an inner and outer ring structure (for details, please refer to the above CN202021868536.2). The fire height of the inner and outer rings is basically the same. The fire characteristics of the same height enable the flame and the frying pan to have better contact. Therefore, the current burner temperature sensor is judged based on the temperature in the center of the frying pan to provide anti-dry burning protection.

[0005] However, the current burner has the following limitations: First, the flame of the current burner is only suitable for flat pans, but not for pots with different shapes (for example, concave, pointed pot (shallow), pointed pot (deep), etc.). The flame of the current burner is difficult to contact the bottom of the pointed pot at different heights, especially at the outer edge of the pointed pot (where the bottom is higher). The flame has poor contact characteristics with the structure of the pointed pot with a low center and high periphery (i.e., a cone-shaped structure), causing heat to dissipate to the surrounding area, resulting in a high temperature in the center of the pointed pot and a low temperature around the periphery. As a result, the food in the center of the pointed pot is easily cooked while the surrounding area is not, so it is necessary to stir-fry continuously to prevent the food in the center from burning; Second, due to the concave, Cookware with different shapes, such as flat bottoms, shallow pots, and deep pots, will cause the temperature sensor to be pressed down to different distances, and the length of the temperature sensor exposed to the burner will also vary. The more exposed part, the greater the interference from smoke, which can lead to inaccurate temperature measurement, false dry burn protection, or failure to perform dry burn protection when the temperature is too high. Therefore, the accuracy of existing temperature sensors is greatly affected by the shape of the cookware. However, the existing technology does not set different dry burn protection temperatures for different cookware, which affects the dry burn protection effect of the cookware. Third, when the user washes the pot or puts food in the pot during cooking, the temperature of the temperature sensor rises sharply, quickly reaching the protection temperature, and the fire goes out, affecting the user experience. Therefore, further improvement of the existing technology is needed. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a burner for a gas stove that provides flames of different heights for cookware of different shapes, so that good contact characteristics can be maintained at all parts of the cookware, in response to the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a burner for a gas stove that can automatically adjust the flame according to the shapes of different pots.

[0008] The third technical problem to be solved by the present invention is to provide a gas stove using the above-mentioned burner.

[0009] The fourth technical problem to be solved by the present invention is to provide a control method for the above-mentioned gas stove, which can realize anti-dry burning protection for pots of different shapes and anti-dry burning protection in the empty burning state.

[0010] The technical solution adopted by the present invention to solve the first technical problem is: a burner for a gas stove, comprising:

[0011] The base comprises an inner cavity and an outer cavity provided on the periphery of the inner cavity, wherein both the inner cavity and the outer cavity are open upward;

[0012] An inner ring fire cover covers the opening of the inner cavity and forms an inner ring gas mixing chamber with the inner cavity, and a first fire hole communicating with the inner ring gas mixing chamber is opened on the inner ring fire cover;

[0013] It is characterized by: further comprising:

[0014] A gas mixing plate is provided on the periphery of the inner ring fire cover and covers the opening of the outer cavity. The gas mixing plate comprises a plurality of annular bodies arranged concentrically and spaced apart. An upwardly open gas channel is formed between at least some of the adjacent annular bodies. There are at least two gas channels, both of which are in communication with the outer cavity.

[0015] Outer ring fire covers, the number of which is consistent with the number of gas channels formed on the gas mixing disk, each outer ring fire cover covers the opening of the corresponding gas channel to form an outer ring gas mixing chamber with the outer cavity, and the outer ring fire cover is provided with a second fire hole connected to the outer ring gas mixing chamber;

[0016] The outer ring fire cover lifting mechanism is used to drive at least one outer ring fire cover to move up and down independently relative to the annular body.

[0017] In order to ensure air replenishment of the outer ring fire cover, an upwardly open secondary air channel is formed between at least part of two adjacent annular bodies, and the secondary air channel and the gas channel are arranged alternately.

[0018] In order to realize gas supply to the gas channel, the mixing disk also has a disk body covering the opening of the outer cavity. A through hole is opened on the upper surface of the disk body and extends from the position adjacent to the through hole to the bottom of the annular body to form a connecting chamber connected to the gas channel.

[0019] In order to enable the gas to pass into the outer ring fire cover, there are at least two through holes, which are arranged at intervals along the circumference of the disk body. The number of the connecting chambers is consistent with the number of the through holes. Each connecting chamber is formed by extending from the corresponding through hole to the bottom of the annular body. The gas channel above each connecting chamber is at least partially connected up and down, and the bottoms of the gas channels above two adjacent connecting chambers are closed so that the gas channel is connected to the outer cavity through the flow chamber.

[0020] In order to let in the secondary air, the bottom of the secondary air passage located above each of the communication chambers is closed, and the secondary air passages located above two adjacent communication chambers are at least partially connected vertically.

[0021] In order to realize the independent lifting and lowering of each outer ring fire cover, there are at least two outer ring fire cover lifting mechanisms, each outer ring fire cover lifting mechanism includes a base plate and a support plate constrained on the base plate so as to be able to lift and lower relative to the base plate. The number of support plates is consistent with the number of outer ring fire covers. Each support plate is correspondingly arranged in a gas channel, and the upper surface of each support plate is arranged below the outer ring fire cover, and can offset the outer ring fire cover when the support plate is lifted and lowered relative to the base plate.

[0022] In order to make the structure simpler, each outer ring fire cover lifting mechanism also includes a lifting rod located between the base plate and each support plate and a driving motor for driving each lifting rod to move up and down.

[0023] In order to prevent the cooker from drying out, the inner cavity is annular and includes an inner ring wall. A temperature probe is embedded in the center of the inner ring wall of the inner cavity. The temperature probe can be elastically moved up and down and extended above the inner ring fire cover.

[0024] In order to dissipate heat for the temperature sensing probe, reduce thermal damage to the temperature sensing probe, and facilitate the discharge of overflow liquid, the inner cavity also includes an outer ring wall arranged outside the inner ring wall, and multiple air inlet channels are formed between the outer ring wall and the inner ring wall.

[0025] In order to avoid the flames of the outer ring fire covers from interfering with each other and burning each other, the second fire holes are arranged at intervals in the circumferential direction on the upper surface of the outer ring fire cover.

[0026] In order to solve the second technical problem mentioned above, the present invention also includes:

[0027] A pot bottom shape detection module, used to detect the shape of the pot bottom; and

[0028] The controller is connected to the pot bottom shape detection module and the outer ring fire cover lifting mechanism, and is configured to control the outer ring fire cover lifting mechanism to perform corresponding actions according to the detection results of the pot bottom shape detection module, thereby driving the corresponding outer ring fire cover to perform independent lifting.

[0029] Preferably, there are at least two pot bottom shape detection modules, and each pot bottom shape detection module is arranged in one of the secondary air channels.

[0030] In order to make the pot bottom shape detection more accurate, the pot bottom shape detection modules are divided into at least two groups and distributed circumferentially in each secondary air channel; each group of pot bottom shape detection modules includes at least two and is arranged along the radial direction of the annular body.

[0031] In order to detect the shape of the pot bottom, each pot bottom shape detection module includes a sleeve, an elastic member, a push rod and a distance measuring mechanism. The elastic member is arranged in the sleeve, and the push rod has a first end exposed in the sleeve and a second end constrained in the sleeve and abutted against one end of the elastic member. The elastic member is used to ensure that the push rod always has a tendency to contact the bottom of the cookware; the distance measuring mechanism is used to detect the compression amount of the elastic member to obtain the displacement of the push rod downward caused by the bottom of the cookware.

[0032] Preferably, the distance measuring mechanism is an infrared distance measuring sensor, comprising an infrared emitting terminal located between one end of the elastic member and the second end of the push rod, and an infrared receiving terminal located at the other end of the elastic member. Of course, other distance measuring methods commonly used in the prior art, such as a laser distance measuring mechanism, may also be used.

[0033] The technical solution adopted by the present invention to solve the third technical problem mentioned above is: a gas stove using the above-mentioned burner, including a stove panel and a pot rack arranged on the stove panel, characterized in that: the gas mixing plate is arranged on the stove panel, and the top of the pot bottom shape detection module is higher than the top of the pot rack.

[0034] The technical solution adopted by the present invention to solve the fourth technical problem is: a control method using the above-mentioned gas stove, characterized in that the number of groups of pot bottom shape detection modules is recorded as m, that is, the number of pot bottom shape detection modules arranged in the same circumferential direction along each secondary air channel is m, and the number of pot bottom shape detection modules arranged in each group along the radial direction of the annular body is recorded as n. The control method of the gas stove comprises the following steps:

[0035] Step 1: Start the pot bottom shape detection module;

[0036] Step 2: Obtain the displacement data of each push rod downward, calculate the average displacement of m push rods downward in the same circumference, and obtain the average displacement of the push rod downward in each secondary air channel circumference in turn and form it into the current displacement data set

[0037] in, is the average downward displacement of m push rods in the circumference of the current first secondary air channel, is the average downward displacement of m push rods in the circumference of the current second secondary air channel, is the average downward displacement of m ejector pins in the circumference of the current nth secondary air channel;

[0038] Step 3: Get the last displacement dataset is the average displacement of m push rods in the circumference of the first secondary air channel at the last time; l 2Bis the average downward displacement of m ejector pins in the circumference of the second secondary air channel last time; is the average downward displacement of m ejector pins on the circumference of the nth secondary air channel in the previous time;

[0039] Step 4: Calculate the deviation δ between the current displacement dataset A and the previous displacement dataset B. The calculation formula for the deviation δ is:

[0040]

[0041] Determine whether the deviation δ is greater than the preset value R. If so, proceed to step 5; if not, continue with step 2 above;

[0042] Step 5: Determine whether H is a preset threshold. If yes, it is determined that the current mode is empty burning, and the current outer ring fire covers are reset to the initial position; if no, it is determined that the current mode is cooking, and the process goes to step 6;

[0043] Step 6. Fit the shape curve of the bottom of the pot based on the current displacement data set A, determine the type of pot based on the shape curve of the bottom of the pot, and calculate the lifting value of each outer ring fire cover according to the different types of pots. In addition, start the outer ring fire cover lifting mechanism to keep the distance between each outer ring fire cover and the bottom of the pot consistent.

[0044] In order to determine the type of the cookware, the specific steps of fitting the shape curve of the cookware bottom and determining the type of the cookware in step 6 are as follows:

[0045] The distances between the top rod and the center axis of the inner ring fire cover in the same radial direction are r1, r2, ..., r n , several scattered points can be depicted on the plane coordinate system

[0046] Using the curve fitting method, discrete data points are fitted into a basically continuous curve, and the slope of each discrete point on the curve is calculated;

[0047] If the slopes α are all greater than 0, the current pot is determined to be a sharp pot;

[0048] If the slopes α are all less than 0, the current pot is determined to be a concave bottom pot;

[0049] If the slopes α are all equal to 0, it is determined that the current cookware is a frying pan.

[0050] In order to calculate the lifting amount of each outer ring fire cover, the specific steps of calculating the lifting value and lifting of each outer ring fire cover in step 6 are as follows:

[0051] The initial position of each outer ring fire cover is: the upper surface of each outer ring fire cover is lower than the plane where the top of the pot rack is located, and the distance between the upper surface of each outer ring fire cover and the plane where the top of the pot rack is located is Z;

[0052] The rise and fall value T of the kth outer ring fire cover k The calculation formula is:

[0053]

[0054] Where, k∈{1, 2, …K}, K is the total number of outer ring fire covers; are the average downward displacements of the current m push rods in the two circumferential directions adjacent to the kth outer ring fire cover;

[0055] And T k Compare with 0;

[0056] When T k > 0, then lower the kth outer ring fire cover |T k |;

[0057] When T k <0, then raise the kth outer ring fire cover |T k |;

[0058] When T k =0, the outer ring fire cover is in the current position and does not move.

[0059] In order to protect the cookware from being burned out, a temperature control module is also included. When it is determined in step 5 that the cookware is in the burn-out mode, a signal is given to the temperature control module to set the burn-out threshold.

[0060] In order to protect the pot from dry burning during the cooking process, when it is determined in step 5 that the cooking mode is selected, a signal is given to the temperature control module to set different dry burning protection temperature thresholds according to different pot types.

[0061] Compared with the prior art, the advantages of the present invention are that an upwardly open gas channel and a plurality of outer ring fire covers covering the opening of the gas channel are formed between at least part of two adjacent annular bodies on the mixing plate, and each outer ring fire cover can be independently raised and lowered relative to the annular body, so that each outer ring fire cover can match the fire shape according to different types of cookware, so that good contact characteristics can be maintained at all parts of the cookware, thereby improving energy efficiency and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 This is a schematic structural diagram of a gas stove according to an embodiment of the present invention;

[0063] Figure 2This is a schematic structural diagram of a gas stove from another perspective in an embodiment of the present invention;

[0064] Figure 3 for Figure 1 Exploded view of

[0065] Figure 4 for Figure 1 sectional view of

[0066] Figure 5 for Figure 1 A cross-sectional view in another direction;

[0067] Figure 6 for Figure 1 Schematic diagram of the structure of the burner;

[0068] Figure 7 for Figure 1 Schematic diagram of the structure of the middle base;

[0069] Figure 8 for Figure 1 Schematic diagram of the structure of the central mixing plate;

[0070] Figure 9 for Figure 1 Schematic diagram of the structure of the central mixing plate from another perspective;

[0071] Figure 10 for Figure 9 sectional view of

[0072] Figure 11 for Figure 1 Cross-sectional view of the pot bottom shape detection module;

[0073] Figure 12 for Figure 1 Schematic diagram of the structure of the inner and outer ring fire cover lifting mechanism. DETAILED DESCRIPTION

[0074] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0075] like Figure 1 and Figure 2 As shown, the gas stove in this embodiment includes a stove panel 8 , a pot rack 9 arranged on the stove panel 8 , and a burner, and at least a portion of the burner is placed on the stove panel 8 .

[0076] like Figures 1 to 12 As shown, the burner in this embodiment includes a base 1, an inner ring fire cover 2, an air mixing plate 3, an outer ring fire cover 4 and an outer ring fire cover lifting mechanism 6.

[0077] The base 1 has an inner cavity 11 and an outer cavity 12 arranged outside the inner cavity 11. The inner cavity 11 and the outer cavity 12 are both open upward. The inner cavity 11 is connected to an inner ejection tube 13, and the outer cavity 12 is connected to an outer ejection tube 14. Figure 7 As shown, the inner cavity 11 is annular and includes an inner ring wall 111. A temperature probe 7 is also embedded in the center of the inner ring wall 111 of the inner cavity 11. The temperature probe 7 can be elastically moved up and down and extended above the inner ring fire cover 2. The specific structure of the temperature probe 7 can refer to the existing technology and will not be elaborated again; the inner cavity 11 also includes an outer ring wall 112 arranged on the outer periphery of the inner ring wall 111, and a plurality of air intake channels 110 are formed between the outer ring wall 112 and the inner ring wall 111.

[0078] like Figure 4 and Figure 5 As shown, the inner ring fire cover 2 covers the opening of the inner cavity 11 and forms an inner ring gas mixing chamber 110 with the inner cavity 11 . A first fire hole 21 communicating with the inner ring gas mixing chamber 110 is opened on the inner ring fire cover 2 .

[0079] like Figure 4 and Figure 5 As shown, the mixing plate 3 is arranged on the periphery of the inner ring fire cover 2 and covers the opening of the outer cavity 12. The mixing plate 3 has a plurality of annular bodies 31 arranged concentrically and spaced apart. A gas channel 310 open upward is formed between at least two adjacent annular bodies 31. There are at least two gas channels 310 and both are connected to the outer cavity 12; an upwardly open secondary air channel 311 is formed between at least two adjacent annular bodies 31. The secondary air channels 311 and the gas channels 310 are arranged alternately.

[0080] like Figures 8-10 As shown, in this embodiment, the mixing disc 3 further comprises a disc body 32 that covers the open outer cavity 12. A through hole 321 is formed on the upper surface of the disc body 32. A communication chamber 322 extends from adjacent through holes 321 toward the bottom of the annular body 31, forming communication chambers 322 that communicate with the gas channel 310. There are at least two through holes 321, spaced apart along the circumference of the disc body 32. The number of communication chambers 322 matches the number of through holes 321. Each communication chamber 322 extends from a corresponding through hole 321 toward the bottom of the annular body 31. The gas channel 310 above each communication chamber 322 at least partially extends vertically through it. The gas channels 310 above two adjacent communication chambers 322 are both sealed at their bottoms, allowing the gas channels 310 to communicate with the outer cavity 12 through the flow chamber 322. The secondary air channel 311 above each communication chamber 322 is also sealed at its bottom. The secondary air channel 311 above two adjacent communication chambers 322 at least partially extends vertically through it.

[0081] The number of the outer ring fire covers 4 is consistent with the number of the gas channels 310 formed on the gas mixing plate 3. Each outer ring fire cover 4 covers the opening of the corresponding gas channel 310 and forms an outer ring gas mixing chamber 120 with the outer cavity 12. The outer ring fire cover 4 is provided with a second fire hole 41 connected to the outer ring gas mixing chamber 120. Figure 1 and Figure 2 As shown, the second fire holes 41 in this embodiment are arranged at circumferential intervals on the upper surface of the outer ring fire cover 4.

[0082] The outer ring fire cover lifting mechanism 6 is used to drive at least one outer ring fire cover 4 to independently move up and down relative to the annular body 31. In this embodiment, there are at least two outer ring fire cover lifting mechanisms 6, such as Figure 12 As shown, each outer ring fire cover lifting mechanism 6 includes a base plate 61 and a support plate 62 constrained on the base plate 61 so as to be able to rise and fall relative to the base plate 61. The number of support plates 62 is consistent with the number of outer ring fire covers 4. Each support plate 62 is correspondingly arranged in a gas channel 310, and the upper surface of each support plate 62 is arranged below the outer ring fire cover 4. When the support plate 62 is lifted upward relative to the base plate 61, it can abut against the outer ring fire cover 4. In addition, each outer ring fire cover lifting mechanism 6 also includes a lifting rod 63 located between the base plate 61 and each support plate 62, and a drive motor for driving each lifting rod 63 to rise and fall.

[0083] In order to automatically adjust the lifting and lowering of the outer ring fire cover according to different types of cookware, this embodiment also includes a pot bottom shape detection module 5 and a controller. The pot bottom shape detection module 5 is used to detect the shape of the bottom of the cookware. The controller is connected to the pot bottom shape detection module 5 and the outer ring fire cover lifting mechanism 6, and is configured to control the outer ring fire cover lifting mechanism 6 to perform corresponding actions according to the detection results of the pot bottom shape detection module 5, thereby driving the corresponding outer ring fire cover 4 to perform independent lifting and lowering.

[0084] like Figure 1 、 2 As shown in Figures 4, 5 and 6, in this embodiment, there are at least two pot bottom shape detection modules 5, each of which is located in one of the secondary air passages 311; the pot bottom shape detection modules 5 are divided into at least two groups and are circumferentially spaced and distributed in each of the secondary air passages 311; each group of pot bottom shape detection modules 5 includes at least two and is arranged along the radial direction of the annular body 31. Figure 1 As shown, the pot bottom shape detection modules 5 are divided into three groups, each group including four probes. The top of each pot bottom shape detection module 5 is higher than the top of the pot rack 9, so as to ensure that the pot can be detected by each pot bottom shape detection module 5 when placed on the pot rack 9.

[0085] like Figure 11As shown, each pot bottom shape detection module 5 in this embodiment includes a sleeve 51, an elastic member 52, a push rod 53, and a distance measuring mechanism. The elastic member 52 is disposed within the sleeve 51. The push rod 53 has a first end 531 exposed within the sleeve 51 and a second end 532 constrained within the sleeve 51 and abutting against one end of the elastic member 52. The elastic member 52 ensures that the push rod 53 always tends to contact the bottom of the pot. The distance measuring mechanism is used to detect the compression of the elastic member 52 to determine the downward displacement of the push rod 53 caused by the pot bottom. The distance measuring mechanism is an infrared distance measuring sensor, comprising an infrared emitting terminal 541 located between one end of the elastic member 52 and the second end 532 of the push rod 53, and an infrared receiving terminal 542 located at the other end of the elastic member 52. Of course, other existing distance measuring mechanisms, such as magnetic inductive elements or laser distance measuring mechanisms, can also be substituted according to actual needs.

[0086] The number of pot bottom shape detection modules is denoted as m, that is, the number of pot bottom shape detection modules arranged in the same circumferential direction along each secondary air channel is m, and the number of pot bottom shape detection modules arranged in each group along the radial direction of the annular body is denoted as n. The above-mentioned gas stove control method includes the following steps:

[0087] Step 1: Start the pot bottom shape detection module;

[0088] Step 2: Obtain the displacement data of each push rod downward, calculate the average displacement of m push rods downward in the same circumference, and obtain the average displacement of the push rod downward in each secondary air channel circumference in turn and form it into the current displacement data set

[0089] in, is the average downward displacement of m push rods in the circumference of the current first secondary air channel, is the average downward displacement of m push rods in the circumference of the current second secondary air channel, is the average downward displacement of m ejector pins in the circumference of the current nth secondary air channel;

[0090] Step 3: Get the last displacement dataset is the average displacement of m push rods in the circumference of the first secondary air channel at the last time; l 2B is the average downward displacement of m ejector pins in the circumference of the second secondary air channel last time; is the average downward displacement of m ejector pins on the circumference of the nth secondary air channel in the previous time;

[0091] Step 4: Calculate the deviation δ between the current displacement dataset A and the previous displacement dataset B. The calculation formula for the deviation δ is:

[0092]

[0093] Determine whether the deviation δ is greater than a preset value R. If so, proceed to step 5; if not, continue with step 2 above. In this embodiment, the new mode is triggered when the pot is placed on the stove and then lifted, when the pot is empty and then placed on the stove, or when the pot is changed.

[0094] Step 5: Determine whether H is a preset threshold. If yes, it is determined that the current mode is empty burning, and the current outer ring fire covers are reset to the initial position; if no, it is determined that the current mode is cooking, and the process goes to step 6;

[0095] In this embodiment, when it is determined to be the dry-burning mode, a signal is given to the temperature control module (i.e., the above-mentioned temperature sensor) to set the dry-burning threshold; when it is determined to be the cooking mode, a signal is given to the temperature control module to set different anti-dry-burning temperature thresholds according to different pot types.

[0096] Step 6. Fit the shape curve of the bottom of the pot based on the current displacement data set A, determine the type of pot based on the shape curve of the bottom of the pot, and calculate the lifting value of each outer ring fire cover according to the different types of pots. In addition, start the outer ring fire cover lifting mechanism to keep the distance between each outer ring fire cover and the bottom of the pot consistent.

[0097] The specific steps for fitting the shape curve of the bottom of the cookware and determining the type of the cookware are as follows:

[0098] The distances between the top rod and the center axis of the inner ring fire cover in the same radial direction are r1, r2, ..., r n , several scattered points can be depicted on the plane coordinate system

[0099] Using the curve fitting method, discrete data points are fitted into a basically continuous curve, and the slope of each discrete point on the curve is calculated;

[0100] If the slopes α are all greater than 0, the current pot is determined to be a sharp pot;

[0101] If the slopes α are all less than 0, the current pot is determined to be a concave bottom pot;

[0102] If the slopes α are all equal to 0, it is determined that the current cookware is a frying pan.

[0103] The specific steps for calculating and raising the lifting value of each outer ring fire cover in step 6 are as follows:

[0104] The initial position of each outer ring fire cover is: the upper surface of each outer ring fire cover is lower than the plane where the top of the pot rack is located, and the distance between the upper surface of each outer ring fire cover and the plane where the top of the pot rack is located is Z;

[0105] The rise and fall value T of the kth outer ring fire cover kThe calculation formula is:

[0106]

[0107] Where, k∈{1, 2, …K}, K is the total number of outer ring fire covers; are the average downward displacements of the current m push rods in the two circumferential directions adjacent to the kth outer ring fire cover;

[0108] And T k Compare with 0;

[0109] When T k > 0, then lower the kth outer ring fire cover |T k |;

[0110] When T k <0, then raise the kth outer ring fire cover |T k |;

[0111] When T k =0, the outer ring fire cover is in the current position and does not move.

Claims

1. A burner for a gas stove, comprising: The base (1) comprises an inner cavity (11) and an outer cavity (12) arranged on the periphery of the inner cavity (11), wherein both the inner cavity (11) and the outer cavity (12) are open upwards; An inner ring fire cover (2) covers the opening of the inner cavity (11) and forms an inner ring gas mixing chamber (110) with the inner cavity (11), and a first fire hole (21) communicating with the inner ring gas mixing chamber (110) is provided on the inner ring fire cover (2); It is characterized by: further comprising: A gas mixing plate (3) is arranged on the periphery of the inner ring fire cover (2) and covers the opening of the outer cavity (12). The gas mixing plate (3) has a plurality of annular bodies (31) arranged concentrically and spaced apart. An upwardly open gas channel (310) is formed between at least two adjacent annular bodies (31). There are at least two gas channels (310) and both are connected to the outer cavity (12). Outer ring fire covers (4), the number of the outer ring fire covers (4) being consistent with the number of the gas channels (310) formed on the gas mixing disk (3), each outer ring fire cover (4) covering the opening of the corresponding gas channel (310) to form an outer ring gas mixing chamber (120) with the outer cavity (12), and a second fire hole (41) communicating with the outer ring gas mixing chamber (120) is provided on the outer ring fire cover (4); An outer ring fire cover lifting mechanism (6) is used to drive at least one outer ring fire cover (4) to independently lift up and down relative to the annular body (31); A pot bottom shape detection module (5) for detecting the shape of the pot bottom; and The controller is connected to the pot bottom shape detection module (5) and the outer ring fire cover lifting mechanism (6), and is configured to control the outer ring fire cover lifting mechanism (6) to perform corresponding actions according to the detection result of the pot bottom shape detection module (5), thereby driving the corresponding outer ring fire cover (4) to be independently lifted and lowered.

2. The burner according to claim 1, characterized in that: An upwardly open secondary air passage (311) is formed between at least two adjacent annular bodies (31), and the secondary air passage (311) and the gas passage (310) are alternately arranged.

3. The burner according to claim 2, characterized in that: The mixing disc (3) further comprises a disc body (32) covering the opening of the outer cavity (12); a through hole (321) is provided on the upper surface of the disc body (32) and a connecting chamber (322) is formed from a position adjacent to the through hole (321) toward the bottom of the annular body (31) and connected to the gas channel (310).

4. The burner according to claim 3, characterized in that: There are at least two through holes (321) arranged at intervals along the circumference of the disk body (32). The number of the communication chambers (322) is consistent with the number of the through holes (321). Each communication chamber (322) is formed by extending from the corresponding through hole (321) to the bottom of the annular body (31). The gas channel (310) located above each communication chamber (322) is at least partially connected vertically. The bottoms of the gas channels (310) located above two adjacent communication chambers (322) are both closed, so that the gas channel (310) is connected to the outer cavity (12) through the communication chamber (322).

5. The burner according to claim 4, characterized in that: The bottom of the secondary air passage (311) located above each of the communication chambers (322) is closed, and the secondary air passages (311) located above two adjacent communication chambers (322) are at least partially connected vertically.

6. The burner according to any one of claims 1 to 5, characterized in that: There are at least two outer ring fire cover lifting mechanisms (6), each outer ring fire cover lifting mechanism (6) includes a bottom plate (61) and a support plate (62) constrained on the bottom plate (61) so as to be able to be lifted up and down relative to the bottom plate (61), the number of the support plates (62) is consistent with the number of the outer ring fire covers (4), each support plate (62) is correspondingly arranged in a gas channel (310), and the upper surface of each support plate (62) is arranged below the outer ring fire cover (4), and can be against the outer ring fire cover (4) when the support plate (62) is lifted up relative to the bottom plate (61).

7. The burner according to claim 6, characterized in that: Each outer ring fire cover lifting mechanism (6) further comprises a lifting rod (63) located between the bottom plate (61) and each support plate (62) and a driving motor for driving each lifting rod (63) to move up and down.

8. The burner according to any one of claims 1 to 5, characterized in that: The inner cavity (11) is annular and includes an inner ring wall (111). A temperature sensing probe (7) is embedded in the center of the inner ring wall (111) of the inner cavity (11). The temperature sensing probe (7) can be elastically moved up and down and extended above the inner ring fire cover (2).

9. The burner according to claim 8, characterized in that: The inner cavity (11) further comprises an outer annular wall (112) arranged on the periphery of the inner annular wall (111), and a plurality of air inlet channels are formed between the outer annular wall (112) and the inner annular wall (111).

10. The burner according to claim 9, characterized in that: The second fire holes (41) are arranged at circumferential intervals on the upper surface of the outer ring fire cover (4).

11. The burner according to claim 1, characterized in that: There are at least two pot bottom shape detection modules (5), and each pot bottom shape detection module (5) is arranged in one of the secondary air channels (311).

12. The burner according to claim 11, characterized in that: The pot bottom shape detection modules (5) are divided into at least two groups and are circumferentially spaced and distributed in each secondary air channel (311); each group of pot bottom shape detection modules (5) includes at least two and are arranged along the radial direction of the annular body (31).

13. The burner according to claim 12, characterized in that: Each pot bottom shape detection module (5) comprises a sleeve (51), an elastic member (52), a push rod (53) and a distance measuring mechanism, wherein the elastic member (52) is arranged in the sleeve (51), and the push rod (53) has a first end (531) exposed in the sleeve (51) and a second end (532) constrained in the sleeve (51) and abutting against one end of the elastic member (52), and the elastic member (52) is configured to ensure that the push rod (53) always has a tendency to contact the pot bottom of the pot; The distance measuring mechanism is used to detect the compression amount of the elastic member (52) to obtain the displacement of the bottom of the pot causing the top rod (53) to move downward.

14. The burner according to claim 13, characterized in that: The distance measuring mechanism is an infrared distance measuring sensor, comprising an infrared emitting end (541) located between one end of the elastic member (52) and the second end (532) of the top rod (53), and an infrared receiving end (542) located at the other end of the elastic member (52).

15. A gas stove using the burner according to claim 13 or 14, comprising a stove panel (8) and a pot rack (9) provided on the stove panel (8), characterized in that: The gas mixing plate (3) is arranged on the stove panel (8), and the top of the pot bottom shape detection module (5) is higher than the top of the pot rack (9).

16. A method for controlling a gas stove according to claim 15, characterized in that: The number of pot bottom shape detection modules is denoted as m, that is, the number of pot bottom shape detection modules arranged in the same circumferential direction along each secondary air channel is m, and the number of pot bottom shape detection modules arranged in each group along the radial direction of the annular body is denoted as n. The above-mentioned gas stove control method includes the following steps: Step 1: Start the pot bottom shape detection module; Step 2: Obtain the displacement data of each push rod downward, calculate the average displacement of m push rods downward in the same circumference, and obtain the average displacement of the push rod downward in each secondary air channel circumference in turn and form it into the current displacement data set in, is the average downward displacement of m push rods in the circumference of the current first secondary air channel, is the average downward displacement of m push rods in the circumference of the current second secondary air channel, is the average downward displacement of m ejector pins in the circumference of the current nth secondary air channel; Step 3: Get the last displacement dataset is the average displacement of m push rods in the circumference of the first secondary air channel at the last time; l 2B is the average downward displacement of m ejector pins in the circumference of the second secondary air channel last time; is the average downward displacement of m ejector pins on the circumference of the nth secondary air channel in the previous time; Step 4: Calculate the deviation δ between the current displacement dataset A and the previous displacement dataset B. The calculation formula for the deviation δ is: Determine whether the deviation δ is greater than the preset value R. If so, proceed to step 5; if not, continue with step 2 above; Step 5: Determine whether H is a preset threshold. If yes, it is determined that the current mode is empty burning, and the current outer ring fire covers are reset to the initial position; if no, it is determined that the current mode is cooking, and the process goes to step 6; Step 6. Fit the shape curve of the bottom of the pot based on the current displacement data set A, determine the type of pot based on the shape curve of the bottom of the pot, and calculate the lifting value of each outer ring fire cover according to the different types of pots. In addition, start the outer ring fire cover lifting mechanism to keep the distance between each outer ring fire cover and the bottom of the pot consistent.

17. The control method according to claim 16, characterized in that: The specific steps of fitting the shape curve of the bottom of the cookware and determining the type of the cookware in step 6 are as follows: The distances between the top rod and the center axis of the inner ring fire cover in the same radial direction are r1, r2, ..., r n , several scattered points can be depicted on the plane coordinate system Using the curve fitting method, discrete data points are fitted into a basically continuous curve, and the slope of each discrete point on the curve is calculated; If the slopes α are all greater than 0, the current pot is determined to be a sharp pot; If the slopes α are all less than 0, the current pot is determined to be a concave bottom pot; If the slopes α are all equal to 0, it is determined that the current cookware is a frying pan.

18. The control method according to claim 17, characterized in that: The specific steps for calculating and raising the lifting value of each outer ring fire cover in step 6 are as follows: The initial position of each outer ring fire cover is: the upper surface of each outer ring fire cover is lower than the plane where the top of the pot rack is located, and the distance between the upper surface of each outer ring fire cover and the plane where the top of the pot rack is located is Z; The rise and fall value T of the kth outer ring fire cover k The calculation formula is: Where, k∈{1, 2, …K}, K is the total number of outer ring fire covers; are the average downward displacements of the current m push rods in the two circumferential directions adjacent to the kth outer ring fire cover; And T k Compare with 0; When T k > 0, then lower the kth outer ring fire cover |T k |; When T k <0, then raise the kth outer ring fire cover |T k |; When T k =0, the outer ring fire cover is in the current position and does not move.

19. The control method according to claim 17 or 18, characterized in that: A temperature control module is also included. When it is determined in step 5 that the empty burning mode is in progress, a signal is given to the temperature control module to set an empty burning threshold.

20. The control method according to claim 19, characterized in that: When it is determined in step 5 that the cooking mode is selected, a signal is sent to the temperature control module to set different anti-dry-burning temperature thresholds according to different cookware types.

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