A cooking liner structure, steaming and baking machine and residual water control method

Abstract

The present invention relates to a cooking liner structure and a steam-bake integrated machine and a residual water control method, comprising an liner and a heating plate, wherein the heating plate is embedded in an installation opening at the center of the bottom wall of the liner, and the inner bottom surface of the liner is tilted downward from the outside to the inside along the circumferential direction with the installation opening as the center, and the heating plate comprises a movable plate located in the center and a fixed ring located at the outer periphery of the movable plate and connected to the installation opening of the liner, the outer periphery of the movable plate and the inner periphery of the fixed ring are connected by a retractable seal, the movable plate can move up and down relative to the fixed ring, and in the initial state, the highest point of the upper surface of the movable plate is lower than the lowest point of the upper surface of the fixed ring, and a pressure sensor is installed at the bottom of the movable plate. The present invention can detect the amount of residual water in the liner and achieve zero residual water, and the heating plate only needs to be dry-burned once during the entire cooking process, which can effectively avoid the problems of residue sintering and shortened service life of the heating plate caused by dry-burning of the heating plate.

Description

Technical Field

[0001] The invention relates to the field of cooking equipment, and in particular to a cooking liner structure, a steaming and baking all-in-one machine, and a residual water control method. Background Art

[0002] At present, the following methods are generally used to solve the problem of residual water in the inner pot of steam cooking equipment such as steamers and steam-bake combination machines: (1) adding a heating plate at the bottom of the inner pot, sensing the bottom temperature through NTC to evaporate the residual water; (2) adding a heating tube at the bottom of the inner pot, using the heating tube to evaporate the residual water in the inner pot through empirical procedures or NTC sensing the bottom temperature; (3) adding a heating film at the bottom of the inner pot, and evaporating the residual water in the inner pot by controlling the on and off of the heating film through a thermostat; (4) adding a PTC heater at the bottom of the inner pot, and evaporating the residual water in the inner pot by controlling the on and off of the PTC through a thermostat; (5) using a water pump to pump back the residual water in the inner pot.

[0003] The first, second, third and fourth methods mentioned above all use a heater to heat and evaporate the residual water, which cannot accurately remove the residual water and achieve zero residual water. Moreover, if the power of the heater at the bottom of the inner pot is increased, although zero residual water can be achieved, on the one hand, long-term dry burning of the heater will affect the life of the heater, and on the other hand, dry burning will also cause sintering of sugar and other substances on the inner surface of the inner pot, making the inner surface of the inner pot difficult to clean. In addition, the continuous high-power operation of the heater will affect the temperature accuracy inside the inner pot under the working state. In addition, the control of the opening and closing of the heater by NTC or thermostat has a certain hysteresis. When using the fifth method mentioned above, if the residual water contains large impurities or food residues, it is easy to cause the water pump to be blocked. It can be seen that the existing method of removing residual water from the inner pot of steaming cooking equipment needs to be improved. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a cooking pot structure capable of detecting the amount of residual water in the pot in view of the prior art.

[0005] The second technical problem to be solved by the present invention is to provide a cooking pot structure capable of achieving zero residual water in the pot in view of the prior art.

[0006] The third technical problem to be solved by the present invention is to provide a steam-bake all-in-one machine with the above-mentioned cooking liner structure in view of the prior art.

[0007] The fourth technical problem to be solved by the present invention is to provide a residual water control method for the above-mentioned cooking inner pot structure that can achieve zero residual water in the inner pot in response to the prior art.

[0008] The fifth technical problem to be solved by the present invention is to provide a method for controlling residual water in the above-mentioned cooking pot structure, which can avoid repeated dry burning of the heating tube, in response to the prior art.

[0009] The technical solution adopted by the present invention to solve at least one of the above technical problems is: a cooking liner structure, including an liner and a heating plate arranged at the bottom of the liner, characterized in that the heating plate is embedded in the installation opening at the center of the bottom wall of the liner, and the inner bottom surface of the liner is inclined downward from the outside to the inside along the circumferential direction with the above-mentioned installation opening as the center, and the above-mentioned heating plate includes a movable plate located in the center and a fixed ring located at the outer periphery of the movable plate and connected to the installation opening of the liner, the outer peripheral edge of the movable plate and the inner peripheral edge of the fixed ring are connected by a retractable sealing member, the movable plate can move up and down relative to the fixed ring, and, in the initial state, the highest point of the upper surface of the movable plate is lower than the lowest point of the upper surface of the fixed ring, and a pressure sensor is installed at the bottom of the above-mentioned movable plate.

[0010] Furthermore, the pressure sensor is arranged horizontally, and the top surface of the pressure sensor is arranged vertically parallel to the bottom surface of the movable disk, and the top surface of one end of the pressure sensor is fixed to the bottom surface of the movable disk through the upper pad. By reducing the contact area between the bottom surface of the movable disk and the top surface of the pressure sensor, the pressure signal transmitted to the pressure sensor by the gravity of the residual water on the upper surface of the movable disk is enlarged, so that the gravity of the residual water on the upper surface of the movable disk can be concentrated and transmitted to the pressure sensor through the upper pad, thereby improving the sensitivity and accuracy of the pressure sensor detection.

[0011] Furthermore, the upper pad includes a first upper pad and a second upper pad located above the first upper pad, the first upper pad is square in shape and the second upper pad is cylindrical and vertically arranged, the cross section of the first upper pad is larger than the second upper pad and the second upper pad is vertically fixed at the center of the top surface of the first upper pad, the free end of the first upper pad is fixed to the top surface of the pressure sensor and the free end of the second upper pad is fixed to the bottom surface of the movable disk. The first upper pad can achieve stable support for the movable disk, and the second upper pad can minimize the contact area between the bottom surface of the movable disk and the top surface of the pressure sensor, thereby further improving the sensitivity and accuracy of the pressure sensor detection.

[0012] Furthermore, the pressure sensor is square in shape and a support plate is horizontally arranged below it, and the bottom surface of the other end of the pressure sensor is fixed to the upper surface of the support plate through a lower pad. The force on both ends of the pressure sensor is balanced through the cooperation of the lower pad and the upper pad, thereby achieving a stable installation of the pressure sensor.

[0013] Furthermore, the horizontal projections of the upper and lower pads on the movable disk extend along the diameter direction of the movable disk and are symmetrically distributed on the outer periphery of the movable disk surface with the center of the movable disk as the center. On the one hand, the movable disk and the pressure sensor can be stably supported, and on the other hand, the gravity of the residual water on the movable disk can be evenly transferred to the pressure sensor, thereby further ensuring the accuracy of the detection result.

[0014] Furthermore, the lower pad includes a first lower pad and a second lower pad below the first lower pad, the first lower pad is square in shape and the second lower pad is cylindrical and vertically arranged, the cross section of the first lower pad is larger than that of the second lower pad and the second lower pad is vertically fixed at the center of the top surface of the first lower pad, the free end of the first upper pad is fixed to the bottom surface of the pressure sensor and the free end of the second upper pad is fixed to the top surface of the support plate, thereby further improving the stable support of the movable disk and the pressure sensor.

[0015] Furthermore, the retractable sealing member is a retractable sealing ring with a circular annular shape, the outer circumference of the movable disk is concave inwardly along the circumferential direction to form a first mounting ring groove, and the inner circumference of the fixed ring is concave outwardly along the circumferential direction to form a first mounting ring groove, and the inner circumference and outer circumference of the retractable sealing ring are respectively embedded and fixed in the first mounting ring groove and the second mounting ring groove along the circumferential direction. In this way, during the upward and downward movement of the movable disk, the sealing between the movable disk and the fixed ring can be always ensured by the expansion and contraction of the retractable sealing ring.

[0016] Furthermore, the upper surface of the movable plate is a horizontal plane, and the height of the upper surface of the fixing ring decreases from the outside to the inside along the circumferential direction, so that the remaining water on the inner bottom surface of the inner tank can be concentrated on the upper surface of the movable plate to the greatest extent.

[0017] Furthermore, the fixing ring includes an inner ring and an outer ring surrounding the outer circumference of the inner ring, and the outer circumference of the inner ring is stacked up and down with the inner circumference of the outer ring, and the inner circumference of the outer ring is recessed outward to form a mounting opening, and fasteners corresponding to the mounting openings are fixed on the bottom surface of the outer circumference of the inner ring, and a mounting sealing ring matching its size is laid on the outer circumference of the upper ring surface of the outer ring, and when the heating plate and the inner pot are installed, the mounting sealing ring is sandwiched between the outer ring and the lower edge of the mounting opening, and each fastener passes through the corresponding mounting opening and is fixed to the lower edge of the mounting opening. In this way, on the one hand, the inner ring and the outer ring in the fixing ring can be stably installed, and on the other hand, the sealing installation between the heating plate and the mounting opening of the inner pot can be achieved.

[0018] Furthermore, a circular heating tube is fixed to the bottom of the inner ring and arranged concentrically therewith, so that the heating tube can evenly heat the water on the heating plate and can more accurately obtain the time required to heat the remaining water on the movable plate.

[0019] Furthermore, there are two heating tubes, one of which has a heating power of 1000W, and the other has a heating power of 800W, so that the heating power of the heating plate can be adjusted as needed.

[0020] Furthermore, an NTC for sensing the temperature of the heating plate is installed at the bottom of the heating plate, so that the heating temperature of the heating plate can be detected by the NTC.

[0021] The technical solution adopted to further solve the third technical problem mentioned above is: a steam-bake all-in-one machine having the cooking liner structure as described above.

[0022] The technical solution adopted to further solve the fourth and fifth technical problems is: a method for controlling residual water in the cooking pot structure as described above, characterized by comprising the following steps:

[0023] (1) Cooking starts, water is pumped into the inner pot through the water pump outside the inner pot, the water pump works for t1 seconds, the heating plate continues to work at high power, and the temperature of the inner pot continues to rise;

[0024] (2) When the temperature of the inner tank reaches 100°C, the heating plate switches to low-power intermittent operation, and the NTC temperature T1 at the bottom of the heating plate is recorded every t2 seconds. When the NTC sensing temperature jumps, that is, T2>T1+N, it is considered that all the remaining water in the inner tank has evaporated, and the pressure sensor value is reset to zero;

[0025] (3) After the pressure sensor value is reset, the water pump continues to pump water for t3 seconds, and the pressure sensor value m1 is recorded. The heating plate continues to heat intermittently at low power. When the pressure sensor detection value is less than m2, it is considered that the remaining water in the inner pot has evaporated. Among them, the m2 value should be as small as possible, and it should be ensured that the heating plate can avoid dry burning before the water pump fills with water next time;

[0026] (4) The water pump continues to pump water for t3 seconds. Based on m1-m2 and the time t4 required for the heating plate to evaporate the water during the heat preservation stage of the inner tank, the water consumption rate Q1 = (m1-m2) / t4 can be calculated;

[0027] (5) When the detection value of the pressure sensor is greater than m2 and the remaining cooking time is less than t5, it is considered that cooking is about to end, where t5>t4. At this time, based on the water consumption Q1 of the heating plate, the water intake m3 required at t5 and the water pump water intake time t6 are calculated. The water pump works according to the calculated water intake time. When cooking is completed, there is no residual water in the inner pot.

[0028] Compared with the prior art, the advantages of the present invention are as follows: the inner bottom surface of the inner pot in the present invention is inclined downward from the outside to the inside along the circumferential direction with the above-mentioned installation opening as the center, and the highest point of the upper surface of the movable plate is lower than the lowest point of the upper surface of the fixed ring, so that the residual water in the inner pot can be concentrated on the upper surface of the movable plate, and the movable plate can move up and down relative to the fixed ring, and a pressure sensor is installed at the bottom of the movable plate, so that the amount of residual water in the inner pot can be detected by the pressure sensor, and when the amount of residual water in the inner pot and the heating power of the heating plate are known, the water intake can be adjusted before the end of cooking, so as to achieve zero residual water in the inner pot after cooking, without the user wiping the inner pot after cooking, which greatly improves the user experience. In addition, during the entire process of the residual water control method of the present invention, the heating plate only needs to be dry-burned once, which can effectively avoid the problems of residue sintering and shortened service life of the heating plate caused by dry-burning of the heating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the cooking pot in an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0031] Figure 3 A schematic diagram of a partial structure of a cooking pot structure according to an embodiment of the present invention;

[0032] Figure 4 A cross-sectional view of a cooking liner structure according to an embodiment of the present invention;

[0033] Figure 5 for Figure 4 A magnified view of a part in the middle;

[0034] Figure 6 It is a schematic diagram of the structure of a heating plate in an embodiment of the present invention;

[0035] Figure 7 for Figure 6 A schematic diagram of the structure in another direction;

[0036] Figure 8 Schematic diagram of the structure of the heating plate in the embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings.

[0038] like Figures 1 to 8As shown, a steam-bake integrated machine includes a cooking liner structure, the cooking liner structure includes an inner liner 1, a water tank 2 and a water pump 3 are respectively arranged above the inner liner 1, an upper heating tube 12 is installed on the inner top surface of the inner liner 1, a back heating tube 13 is installed on the back side, and a bottom heating tube (not shown) and a heating plate 4 are respectively installed on the bottom, wherein, in this embodiment, the heating power of the upper heating tube 12 is 1700W (1000W+700W), the heating power of the back heating tube 13 is 1400W, and the heating power of the lower heating tube is 700W, and the heating plate 4 includes two heating tubes 9, and the heating power of one heating tube 9 is 1000W, and the heating power of the other heating tube 9 is 800W, and the two heating tubes 9 can be controlled separately, that is, the high power of the heating plate 4 is 1800W, and the low power is 800W. In addition, an NTC (not shown) for sensing the temperature of the heating plate 4 is installed at the bottom of the heating plate 4. When the steam-bake machine is working (steaming function or steam-bake function), water in the water tank 2 is pumped into the inner pot 1 through the water pump 3, and is heated by the heating plate 4 to generate steam for cooking.

[0039] Furthermore, a circular mounting opening 11 is provided at the center of the bottom wall of the inner pot 1, the heating plate 4 is embedded in the mounting opening 11, and the inner bottom surface of the inner pot 1 is inclined downward from the outside to the inside along the circumferential direction with the mounting opening 11 as the center, the heating plate 4 includes a movable plate 41 located in the center and a fixed ring 42 located at the outer periphery of the movable plate 41 and connected to the mounting opening 11 of the inner pot 1, the outer peripheral edge of the movable plate 41 and the inner peripheral edge of the fixed ring 42 are connected by a retractable seal, the movable plate 41 can move up and down relative to the fixed ring 42, and, in the initial state, the highest point of the upper surface of the movable plate 41 is lower than the lowest point of the upper surface of the fixed ring 42, and a pressure sensor 5 is installed at the bottom of the movable plate 41. Since the inner bottom surface of the inner pot 1 is tilted downward from outside to inside along the circumferential direction with the above-mentioned installation opening 11 as the center, the highest point of the upper surface of the movable plate 41 is lower than the lowest point of the upper surface of the fixed ring 42, so that the residual water in the inner pot 1 can be concentrated on the upper surface of the movable plate 41, and the movable plate 41 can move up and down relative to the fixed ring 42, and a pressure sensor 5 is installed at the bottom of the movable plate 41, so that the residual water in the inner pot 1 can be detected by the pressure sensor 5, and when the residual water in the inner pot 1 and the heating power of the heating plate 4 are known, the water intake can be adjusted before the cooking is finished, so as to achieve zero residual water in the inner pot 1 after the cooking is finished, so that the user does not need to wipe the inner pot 1 after the cooking is finished, which greatly improves the user's experience. Preferably, in this embodiment, the upper surface of the movable plate 41 is a horizontal plane, and the height of the upper surface of the above-mentioned fixed ring 42 decreases from outside to inside along the circumferential direction, so that the residual water on the inner bottom surface of the inner pot 1 can be concentrated on the upper surface of the movable plate 41 to the greatest extent.

[0040] Specifically, when the steaming function or the steaming and baking function of the steam-bake machine is started, the water pump 3 draws water from the water tank 2, enters the inner pot 1 through the water pipe (not shown), and flows toward the center of the inner bottom surface of the inner pot 1. Under the influence of the weight of the water, the upper surface of the movable plate 41 is subjected to pressure, and the entire movable plate 41 moves downward. The pressure sensor 5 detects and obtains the amount of water M1 at this time. When the pressure sensor 5 receives the pressure signal, it transmits the pressure signal to the controller (not shown). The controller controls the heating tube 9 in the heating plate 4 to start working, and stabilizes the set temperature in the inner pot 1 through the intermittent operation of the heating tube 9. As time goes by, the water is gradually evaporated, and the weight on the upper surface of the movable plate 41 gradually disappears and returns to the initial position. The weight M2 at this time and the consumed time t are recorded. Under the premise that the average power, M1, M2, and t required for the heating plate 4 to stabilize the temperature are known, the speed of evaporation of water under this power is calculated. Therefore, according to the set time, the water intake can be adjusted before the end of cooking to achieve zero residual water in the inner pot 1 after the end of cooking. It can be seen that, under the premise of ensuring the sealing performance of the inner tank 1, the present invention achieves zero residual water in the inner tank 1 through the coordinated cooperation among the heating plate 4, the pressure sensor 5 and the water pump 3.

[0041] Furthermore, the specific method for controlling the residual water in the above-mentioned steam-bake combination machine of the present invention is as follows:

[0042] (1) Cooking starts (steaming function or steam-bake function). Water is pumped into the inner pot 1 through the water pump 3 outside the inner pot 1. The working time of the water pump 3 is t1 seconds. The heating plate 4 continues to work at a high power (i.e., 1800 W), and the temperature of the inner pot 1 continues to rise.

[0043] (2) When the temperature of the inner tank 1 reaches 100°C, the heating plate 4 switches to low-power intermittent operation and records the NTC temperature T1 at the bottom of the heating plate 4 every t2 seconds. When the NTC sensing temperature jumps, that is, T2>T1+N, it is considered that all the remaining water in the inner tank 1 has evaporated. At this time, the value of the pressure sensor 5 is reset to zero, where N refers to a significant change in the values ​​of T2 and T1, and N can be T1 / 2).

[0044] (3) After the value of pressure sensor 5 is reset, water pump 3 continues to pump water for t3 seconds, and the value of pressure sensor 5 m1 is recorded. Heating plate 4 continues to heat intermittently at low power. When the detection value of pressure sensor 5 is less than m2, it is considered that the remaining water in inner pot 1 has evaporated. Among them, the value of m2 should be as small as possible, and at the same time, it should be ensured that heating plate 4 can avoid dry burning before water pump 3 fills water next time.

[0045] (4) The water pump 3 continues to pump water for t3 seconds. Based on m1-m2 and the time t4 required for the heating plate 4 to evaporate the water during the insulation stage of the inner pot 1, the water consumption rate Q1=(m1-m2) / t4 can be calculated.

[0046] (5) When the detection value of the pressure sensor 5 is greater than m2 and the remaining cooking time is less than t5, it is considered that the cooking is about to end, where t5>t4. At this time, according to the water consumption Q1 of the heating plate 4, the water intake m3 required for t5 and the water intake time t6 of the water pump 3 are calculated. The water pump 3 works according to the calculated water intake time. When cooking is completed, there is no residual water in the inner pot 1.

[0047] Furthermore, the value range of t2 is 2s to 4s, and the value range of m2 is 10g to 20g. The specific data of m2 needs to be calculated based on the water pipe diameter r, the water pipe length l, and the flow rate q of the water pump 3 to calculate the time required for the water pump 3 to go from absorbing water to entering water. And according to the above water consumption rate Q1, the value of m2 is accurately calculated as m=t2×Q1.

[0048] The residual water control method of the present invention can effectively achieve zero residual water in the inner pot 1, eliminating the need for the user to wipe the inner pot 1 after cooking. In the entire process, the heating plate 4 only needs to be dry-burned once, which can effectively avoid the problem of residue sintering caused by dry-burning of the heating plate 4 and shortened service life of the heating plate 4.

[0049] Furthermore, the pressure sensor 5 is arranged horizontally, and the top surface of the pressure sensor 5 is arranged parallel to the bottom surface of the movable disk 41, and the top surface of one end of the pressure sensor 5 is fixed to the bottom surface of the movable disk 41 through the upper pad 6. By reducing the contact area between the bottom surface of the movable disk 41 and the top surface of the pressure sensor 5, the pressure signal applied to the pressure sensor 5 by the gravity of the residual water on the upper surface of the movable disk 41 is enlarged, so that the gravity of the residual water on the upper surface of the movable disk 41 can be concentrated and transmitted to the pressure sensor 5 through the upper pad 6, thereby improving the sensitivity and accuracy of the pressure sensor 5 detection. The pressure sensor 5 is square in shape and a support plate 8 is arranged horizontally below it. The bottom surface of the other end of the pressure sensor 5 is fixed to the upper surface of the support plate 8 through the lower pad 7, so that the force balance at both ends of the pressure sensor 5 is achieved through the cooperation of the lower pad 7 and the upper pad 6, thereby achieving a stable installation of the pressure sensor 5.

[0050] In this embodiment, the horizontal projections of the upper pad 6 and the lower pad 7 on the movable disk 41 extend along the diameter direction of the movable disk 41 and are symmetrically distributed on the outer periphery of the movable disk 41 with the center of the circle of the movable disk 41 as the center. On the one hand, the movable disk 41 and the pressure sensor 5 are stably supported, and on the other hand, the gravity of the residual water on the movable disk 41 can be evenly transferred to the pressure sensor 5, thereby further ensuring the accuracy of the detection result. Specifically, the upper pad 6 includes a first upper pad 61 and a second upper pad 62 located above the first upper pad 61, the first upper pad 61 is square in shape and the second upper pad 62 is cylindrical and vertically arranged, the cross section of the first upper pad 61 is larger than the second upper pad 62 and the second upper pad 62 is vertically fixed at the center of the top surface of the first upper pad 61, the free end of the first upper pad 61 is fixed to the top surface of the pressure sensor 5 and the free end of the second upper pad 62 is fixed to the bottom surface of the movable disk 41. The first upper pad 61 can realize stable support for the movable disk 41, and the second upper pad 62 can minimize the contact area between the bottom surface of the movable disk 41 and the top surface of the pressure sensor 5, thereby further improving the sensitivity and accuracy of the pressure sensor 5 detection. The lower pad 7 includes a first lower pad 71 and a second lower pad 72 located below the first lower pad 71. The first lower pad 71 is square in shape and the second lower pad 72 is cylindrical and vertically arranged. The cross section of the first lower pad 71 is larger than that of the second lower pad 72 and the second lower pad 72 is vertically fixed at the center of the top surface of the first lower pad 71. The free end of the first upper pad 61 is fixed to the bottom surface of the pressure sensor 5 and the free end of the second upper pad 62 is fixed to the top surface of the support plate 8. Thus, the stable support for the movable disk 41 and the pressure sensor 5 is further improved.

[0051] In this embodiment, the retractable sealing member is a retractable sealing ring 43 in the shape of a circular ring. The outer circumference of the movable disk 41 is concave inwardly along the circumferential direction to form a first mounting ring groove 411, and the inner circumference of the fixed ring 42 is concave outwardly along the circumferential direction to form a second mounting ring groove 4211. The inner circumference and outer circumference of the retractable sealing ring 43 are respectively embedded and fixed in the first mounting ring groove 411 and the second mounting ring groove 4211 along the circumferential direction. In this way, during the upward and downward movement of the movable disk 41, the sealing between the movable disk 41 and the fixed ring 42 can be always ensured by the expansion and contraction of the retractable sealing ring 43.

[0052] In addition, the fixing ring 42 includes an inner ring 421 and an outer ring 422 arranged around the outer circumference of the inner ring 421, and the outer circumferential edge of the inner ring 421 is overlapped with the inner circumferential edge of the outer ring 422, and the inner circumferential edge of the outer ring 422 is recessed outward to form an installation opening 4221, and fasteners 45 corresponding to the above-mentioned installation openings 4221 are fixed on the bottom surface of the outer circumferential edge of the above-mentioned inner ring 421 (the fasteners 45 in this embodiment are bolts), and an installation sealing ring 44 matching its size is laid on the outer circumference of the upper ring surface of the above-mentioned outer ring 422 (the installation sealing ring 44 and the outer ring 422 are an integral part in this embodiment). When the heating plate 4 and the inner tank 1 are installed, the above-mentioned installation sealing ring 44 is clamped between the outer ring 422 and the lower edge of the above-mentioned installation opening 11, and each fastener 45 passes through the corresponding installation opening 4221 and is fixed to the lower edge of the installation opening 11. In this way, on the one hand, the inner ring 421 and the outer ring 422 in the fixed ring 42 can be stably installed, and on the other hand, the heating plate 4 can be sealed with the installation opening 11 of the inner pot 1. The above-mentioned heating tubes 9 are annular in shape and are fixed to the bottom of the inner ring 421, and are respectively concentrically arranged with the inner ring 421, so that the heating tubes 9 can evenly heat the water on the heating plate 4, and the time required to heat the residual water on the movable plate 41 can be obtained more accurately.

Claims

1. A method for controlling residual water in a cooking liner structure, the cooking liner structure comprising an liner (1) and a heating plate (4) arranged at the bottom of the liner (1), characterized in that: The heating plate (4) is embedded in the installation opening (11) at the center of the bottom wall of the inner pot (1), and the inner bottom surface of the inner pot (1) is inclined downward from the outside to the inside along the circumferential direction with the installation opening (11) as the center. The heating plate (4) includes a movable plate (41) located at the center and a fixed ring (42) located at the outer periphery of the movable plate (41) and connected to the installation opening (11) of the inner pot (1). The outer periphery of the movable plate (41) and the inner periphery of the fixed ring (42) are connected by a retractable sealing member. The movable plate (41) can move up and down relative to the fixed ring (42), and in an initial state, the highest point of the upper surface of the movable plate (41) is lower than the lowest point of the upper surface of the fixed ring (42), and a pressure sensor (5) is installed at the bottom of the movable plate (41); The residual water control method comprises the following steps: (1) Cooking starts, water is introduced into the inner pot (1) through a water pump (3) outside the inner pot (1), the water pump (3) works for t1 seconds, the heating plate (4) works continuously at high power, and the temperature of the inner pot (1) continues to rise; (2) When the temperature of the inner pot (1) reaches 100°C, the heating plate (4) switches to low-power intermittent operation, and records the NTC temperature T1 at the bottom of the heating plate (4) every t2 seconds. When the NTC sensing temperature jumps, that is, T2>T1+N, it is considered that all the remaining water in the inner pot (1) has evaporated, and the value of the pressure sensor (5) is reset to zero; (3) After the value of the pressure sensor (5) is reset to zero, the water pump (3) continues to pump water for t3 seconds, and the value m1 of the pressure sensor (5) is recorded. The heating plate (4) continues to heat intermittently at a low power. When the detection value of the pressure sensor (5) is less than m2, it is considered that the remaining water in the inner pot (1) has evaporated. The value m2 should be as small as possible, and it should be ensured that the heating plate (4) can be prevented from drying out before the water pump (3) is filled with water next time. (4) The water pump (3) continues to pump water for t3 seconds. Based on m1-m2 and the time t4 required for the heating plate (4) to evaporate the water during the heat preservation stage of the inner pot (1), the water consumption rate Q1=(m1-m2) / t4 can be calculated; (5) When the detection value of the pressure sensor (5) is greater than m2 and the remaining cooking time is less than t5, it is considered that the cooking is about to end, wherein t5>t4. At this time, according to the water consumption Q1 of the heating plate (4), the water intake volume m3 required for t5 and the water intake time t6 of the water pump (3) are calculated. The water pump (3) works according to the calculated water intake time. When cooking is finished, zero residual water is achieved in the inner pot (1).

2. The residual water control method according to claim 1, characterized in that: The pressure sensor (5) is arranged horizontally, and the top surface of the pressure sensor (5) is arranged parallel to the bottom surface of the movable disk (41) in the vertical direction, and the top surface of one end of the pressure sensor (5) is fixed to the bottom surface of the movable disk (41) through an upper pad (6).

3. The residual water control method according to claim 2, characterized in that: The upper pad (6) comprises a first upper pad (61) and a second upper pad (62) located above the first upper pad (61); the first upper pad (61) is square in shape and the second upper pad (62) is cylindrical in shape and is vertically arranged; the cross section of the first upper pad (61) is larger than that of the second upper pad (62) and the second upper pad (62) is vertically fixed at the center of the top surface of the first upper pad (61); the free end of the first upper pad (61) is fixed to the top surface of the pressure sensor (5) and the free end of the second upper pad (62) is fixed to the bottom surface of the movable disk (41).

4. The residual water control method according to claim 2, characterized in that: The pressure sensor (5) has a square shape and a support plate (8) is horizontally arranged below it. The bottom surface of the other end of the pressure sensor (5) is fixed to the upper surface of the support plate (8) via a lower pad (7).

5. The residual water control method according to claim 4, characterized in that: The horizontal projections of the upper pad (6) and the lower pad (7) on the movable disk (41) extend along the diameter direction of the movable disk (41) and are symmetrically distributed on the outer periphery of the movable disk (41) with the center of the movable disk (41) as the center.

6. The residual water control method according to claim 4, characterized in that: The lower pad (7) comprises a first lower pad (71) and a second lower pad (72) located below the first lower pad (71); the first lower pad (71) is square in shape and the second lower pad (72) is cylindrical in shape and is vertically arranged; the cross section of the first lower pad (71) is larger than that of the second lower pad (72) and the second lower pad (72) is vertically fixed at the center of the top surface of the first lower pad (71); the free end of the first upper pad (61) is fixed to the bottom surface of the pressure sensor (5) and the free end of the second upper pad (62) is fixed to the top surface of the support plate (8).

7. The residual water control method according to any one of claims 1 to 6, characterized in that: The retractable sealing component is a retractable sealing ring (43) having a circular ring shape. The outer peripheral edge of the movable disk (41) is recessed inwardly along the circumferential direction to form a first mounting ring groove (411), and the inner peripheral edge of the fixed ring (42) is recessed outwardly along the circumferential direction to form a second mounting ring groove (4211). The inner peripheral edge and outer peripheral edge of the retractable sealing ring (43) are respectively embedded and fixed in the first mounting ring groove (411) and the second mounting ring groove (4211) along the circumferential direction.

8. The residual water control method according to any one of claims 1 to 6, characterized in that: The upper surface of the movable disk (41) is a horizontal plane, and the height of the upper surface of the fixed ring (42) decreases from the outside to the inside along the circumferential direction.

9. The residual water control method according to any one of claims 1 to 6, characterized in that: The fixing ring (42) comprises an inner ring (421) and an outer ring (422) arranged around the outer circumference of the inner ring (421), and the outer circumference of the inner ring (421) is stacked up and down with the inner circumference of the outer ring (422), and the inner circumference of the outer ring (422) is recessed outward to form a mounting opening (4221), and fasteners (45) corresponding to the mounting openings (4221) are fixed on the bottom surface of the outer circumference of the inner ring (421), and a mounting sealing ring (44) of a size matching the outer ring (422) is laid on the outer circumference of the upper ring surface of the outer ring (422), and when the heating plate (4) and the inner pot (1) are in the installed state, the mounting sealing ring (44) is sandwiched between the outer ring (422) and the lower edge of the mounting opening (11), and each fastener (45) passes through the corresponding mounting opening (4221) and is fixed to the lower edge of the mounting opening (11).

10. The residual water control method according to claim 9, characterized in that: A circular heating tube (9) arranged concentrically therewith is fixed at the bottom of the inner ring (421).

11. The residual water control method according to claim 10, characterized in that: There are two heating tubes (9), the heating power of one heating tube (9) is 1000W, and the heating power of the other heating tube (9) is 800W.

12. The residual water control method according to any one of claims 1 to 6, characterized in that: An NTC for sensing the temperature of the heating plate (4) is installed at the bottom of the heating plate (4).

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