Positive and negative pressure control device and control method for electric cooker and electric cooker

Abstract

The invention relates to the technical field of electric rice cookers, in particular to a positive and negative pressure control device and method for an electric rice cooker and the electric rice cooker, and aims to solve the problems that when an existing electric rice cooker works, the pressure in a cooker body cannot be automatically controlled within a stable and appropriate range, food materials are heated unevenly, and the taste and quality of food are poor. In order to achieve the purpose, the positive and negative pressure control device for the electric cooker comprises a vacuumizing mechanism and a pressure relief mechanism; the vacuumizing mechanism and the pressure relief mechanism are both installed on the cooker cover and are both in communication connection with the controller, and the positive and negative pressure control for controlling the pressure in the cooker body to be discharged out of the cooker body is achieved. According to the positive and negative pressure control device for the electric cooker, the vacuumizing mechanism vacuumizes the cooker body to enable the cooker body to form a negative pressure state, the pressure relief mechanism controls the interior of the cooker body to be kept in a positive pressure state, the pressure in the cooker body can be automatically controlled within a stable and appropriate range, food materials are evenly heated, and then the taste and quality of food are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric rice cookers, and specifically provides a positive and negative pressure control device and a control method for the electric rice cooker, and the electric rice cooker. Background Art

[0002] The working principle of traditional rice cookers is mainly to convert electrical energy into thermal energy and heat it through a heating plate. There is a heating plate inside the rice cooker, and electric heating wires are hidden on the heating plate. These electric heating wires are controlled by an automatic switch. There is a temperature-sensitive soft magnet in the center of the heating plate, which is pressed upward against the bottom of the pot through a spring. When the switch button is pressed, the switch crossbar pushes the magnet upward against the temperature-sensitive soft magnet, and then the electric heating wire is connected and heating begins. During the cooking process, the water in the pot gradually decreases and the temperature rises. When the temperature reaches 103°C, the temperature-sensitive soft magnet loses its magnetism and is no longer attracted by the permanent magnet. At this time, the lever of the switch drops due to the elastic force of the spring and its own gravity, disconnecting the electric heating wire and stopping heating. At the same time, the insulation circuit is turned on to keep the temperature of the rice at around 70°C.

[0003] However, when the electric rice cooker is working, the internal pressure of the rice cooker body cannot be automatically controlled within a stable and appropriate range, resulting in uneven heating of the food, resulting in poor taste and quality of the food. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the internal pressure of the existing electric rice cooker cannot be automatically controlled within a stable and appropriate range when the rice cooker is working, resulting in uneven heating of food ingredients, resulting in poor taste and quality of the food.

[0005] In a first aspect, the present invention provides a positive and negative pressure control device for an electric rice cooker, the electric rice cooker comprising a cooker body, a cooker cover and a controller;

[0006] The pot cover is located above the pot body and is connected to the pot body in an openable and closable manner, and the controller is installed on the pot body;

[0007] The positive and negative pressure control device includes a vacuum pumping mechanism and a pressure relief mechanism;

[0008] The vacuum pumping mechanism and the pressure relief mechanism are both installed on the pot cover and are in communication connection with the controller, and are used to control the pressure discharge in the pot body to achieve positive and negative pressure control of the pot body.

[0009] In the preferred technical solution of the positive and negative pressure control device for an electric rice cooker, the cooker cover is provided with a first exhaust hole;

[0010] The vacuum pumping mechanism includes a pressure sensor and a vacuum pump;

[0011] The pressure sensor is installed on the pot cover and is in communication with the controller, and is used to obtain the pressure value inside the pot body;

[0012] The vacuum pump is installed on the pot cover and is connected to the controller and the first exhaust hole respectively, and is used to control the vacuum pump to extract the internal pressure of the pot body and discharge it through the first exhaust hole according to the pressure value, so that a negative pressure state is formed inside the pot body.

[0013] In the preferred technical solution of the positive and negative pressure control device for the electric rice cooker, the pressure relief mechanism includes a pressure relief structure, a mounting assembly, a flexible seal, a drive assembly and a power assembly;

[0014] The pressure relief structure is constructed inside the pot cover and is connected to the inside of the pot body and the outside of the pot cover respectively, so as to discharge the pressure;

[0015] The mounting assembly is arranged inside the pot cover and is used to mount the flexible seal and the driving assembly;

[0016] The flexible seal is arranged inside the pressure relief structure and mounted on the mounting assembly;

[0017] The driving assembly is disposed on the pot cover and mounted on the mounting assembly, and is connected to the flexible sealing member;

[0018] The power assembly is connected to the drive assembly and the controller respectively, and is used to drive the drive assembly to drive the flexible seal to retract or reset, so that the flexible seal can block or open the inner lower part of the pressure relief structure to control the pressure discharge.

[0019] In the preferred technical solution of the positive and negative pressure control device for the electric rice cooker, the pressure relief structure includes a pressure relief chamber and a pressure relief channel;

[0020] The pressure relief chamber is constructed inside the pot cover and has a third exhaust hole, and the third exhaust hole is communicated with the outside of the pot cover;

[0021] The pressure relief channel is constructed inside the pot cover and has an air inlet hole and a second air outlet hole. The air inlet hole is communicated with the inside of the pot body, and the second air outlet hole is communicated with the pressure relief chamber.

[0022] In the preferred technical solution of the positive and negative pressure control device for the electric rice cooker, the flexible sealing member comprises an inner cavity, an opening, a convex edge and a constriction;

[0023] The interior of the flexible seal is the inner cavity, the opening is formed at the upper end of the flexible seal and is connected to the inner cavity, the convex edge is arranged around the outer periphery of the opening and is integrally formed, and the lower part of the flexible seal is configured with a constriction that is tightened toward the inner cavity so as to divide the inner cavity into a connected upper inner cavity part and a lower inner cavity part.

[0024] In the preferred technical solution of the positive and negative pressure control device for the rice cooker, the mounting assembly includes an inner lining plate and a pressing plate;

[0025] The inner lining plate is installed inside the pot cover, and the inner lining plate has an inner lining plate through hole, a first annular protrusion, a second annular protrusion, a third annular protrusion and a mounting groove;

[0026] The inner lining plate through hole is opened on one side of the inner lining plate and is used for installing the flexible sealing member;

[0027] The first annular protrusion is formed on the upper surface of the inner lining plate and is arranged around the outer edge of the through hole of the inner lining plate and extends upwardly of the inner lining plate;

[0028] The second annular protrusion is formed on the upper surface of the inner lining plate and is arranged around the first annular protrusion and extends upwardly from the inner lining plate;

[0029] The gap between the first annular protrusion and the second annular protrusion is the mounting groove, which is used to mount the convex edge of the flexible seal;

[0030] The third annular protrusion is formed on the inner lining plate and is adjacent to the second annular protrusion;

[0031] The pressing plate has a first through hole of the pressing plate, a fourth annular protrusion, a fifth annular protrusion and a second through hole of the pressing plate;

[0032] The first through hole of the pressing plate is opened on one side of the pressing plate and corresponds to the middle of the through hole of the inner lining plate;

[0033] The fourth annular protrusion is formed on the bottom of the pressing plate and is arranged around the first through hole of the pressing plate, and extends toward the bottom of the pressing plate;

[0034] The fifth annular protrusion is formed below the pressing plate and surrounds the fourth annular protrusion, and extends downwardly from the pressing plate so that the lower end of the fifth annular protrusion abuts against the convex edge of the flexible seal to fix the convex edge;

[0035] The second through hole of the pressing plate is opened at one side of the pressing plate and is adjacent to the fifth annular protrusion, so that the third annular protrusion can be inserted into the second through hole of the pressing plate.

[0036] In the preferred technical solution of the positive and negative pressure control device for the electric rice cooker, the driving assembly includes a guide rod, a return spring, a driving plate, a mounting ear, a connecting shaft, a rotating shaft, a locking screw and a gasket;

[0037] The guide rod is inserted into the first through hole of the pressure plate and the through hole of the inner lining plate, and the lower end of the guide rod has a convex ring, which is inserted into the lower part of the inner cavity of the flexible seal and is limited by the shrinkage;

[0038] The return spring is sleeved on the guide rod, the upper end of the return spring abuts against the lower edge of the fourth annular protrusion, and the lower end of the return spring abuts against the protruding ring, so as to limit the return spring;

[0039] The driving plate has a driving plate through hole and a bending portion, wherein the driving plate through hole is opened at one end of the driving plate and corresponds to the first through hole of the pressing plate, and the driving plate is configured with the bending portion so that the other end of the driving plate is tilted;

[0040] The locking screw and the gasket are both installed in the through hole of the driving plate and the upper end of the guide rod;

[0041] The rotating shaft is inserted into the first through hole of the pressing plate and installed in the second through hole of the pressing plate, and the upper end of the rotating shaft has a transverse installation through hole;

[0042] The mounting ear is constructed below the middle of the driving plate and corresponds to the mounting through hole. The mounting ear and the mounting through hole are plugged in through the connecting shaft so that the driving plate moves with the rotating shaft as the axis and in the form of a lever.

[0043] In the preferred technical solution of the positive and negative pressure control device for an electric rice cooker, the power assembly includes a motor and a cam;

[0044] The motor is installed on the pot cover and connected to the controller;

[0045] The cam is located at the upper part of the other end of the driving plate and is connected to the power output shaft of the motor. The cam is used to press the other end of the driving plate to descend, so that one end of the driving plate is lifted to drive the guide rod to rise, and is used to lift the lower part of the inner cavity of the flexible seal to cause the flexible seal to bend, so that the bottom surface of the flexible seal and the second exhaust hole are separated, so that the pressure is discharged through the air inlet hole, the pressure relief channel, the second exhaust hole, the pressure relief chamber, and the third exhaust hole.

[0046] In the preferred technical solution of the positive and negative pressure control device for an electric rice cooker, the electric rice cooker further comprises a heating element, a first temperature sensor, a second temperature sensor and a sound generating unit;

[0047] The heating element is installed inside the pot body and is in communication connection with the controller, and is used to heat the pot body;

[0048] The first temperature sensor is installed on the pot cover and is in communication connection with the controller so as to obtain the temperature of the upper part of the pot body;

[0049] The second temperature sensor is installed inside the pot body and is in communication connection with the controller so as to obtain the temperature of the lower part of the pot body;

[0050] The sound-generating unit is installed on the pot body and is in communication connection with the controller so as to generate sound prompts.

[0051] When the above-mentioned technical scheme is adopted, the positive and negative pressure control device for the electric rice cooker of the present application first evacuates the cooker body through the vacuum pumping mechanism to make the cooker body form a negative pressure state, and then controls the inside of the cooker body to maintain a positive pressure state through the pressure relief mechanism. The vacuum mechanism or the pressure relief mechanism is controlled by the controller to work, so that the internal pressure of the cooker body can be automatically controlled within a stable and appropriate range, so that the food is heated evenly, thereby improving the taste and quality of the food.

[0052] In a second aspect, the present invention further provides a control method for the positive and negative pressure control device for an electric rice cooker according to the first aspect, the control method comprising the following steps:

[0053] The vacuuming mechanism is used to vacuum the pot body in the low-temperature water absorption stage, so that the interior of the pot body is kept in a negative pressure state;

[0054] The pressure relief mechanism is used to automatically relieve the pressure of the pot body during the rapid temperature rise phase, so that the interior of the pot body is kept in a positive pressure state;

[0055] Actively relieving the pressure of the pot body during the gelatinization stage by using the pressure relief mechanism, so that the interior of the pot body forms a pressure-free state;

[0056] The pressure relief mechanism is used to actively relieve pressure on the pot body during the temperature compensation stage, so that a low positive pressure state is formed inside the pot body.

[0057] In the preferred technical solution of the control method of the positive and negative pressure control device for the electric rice cooker, the vacuuming mechanism is used to vacuumize the cooker body in the low-temperature water absorption stage so that the interior of the cooker body is maintained in a negative pressure state, comprising the following steps:

[0058] The controller controls the heating element to heat the pot body;

[0059] Acquiring a first temperature value inside the pot body;

[0060] When the first temperature value reaches a first preset temperature value, the controller controls the pressure relief mechanism to be in a closed state and controls the vacuum pumping mechanism to vacuum the pot body;

[0061] Acquire a first negative pressure value of the pot body during the vacuuming process;

[0062] When the first negative pressure value reaches a first preset negative pressure value, the vacuum pumping mechanism temporarily stops vacuum pumping;

[0063] Obtaining a second negative pressure value of the pot body after temporarily stopping vacuuming;

[0064] When the second negative pressure value reaches a second preset negative pressure value, the controller controls the vacuum pumping mechanism to perform vacuum pumping so that the internal pressure of the pot body is between the first preset negative pressure value and the second negative pressure value.

[0065] In the preferred technical solution of the control method of the positive and negative pressure control device for the electric rice cooker, the method of using the pressure relief mechanism to automatically relieve pressure on the cooker body in the rapid temperature rise stage so that the interior of the cooker body is maintained in a positive pressure state comprises the following steps:

[0066] After the low-temperature water absorption stage, the controller controls the heating element to heat the pot body at full power, and controls the pressure relief mechanism to be in an open state;

[0067] Acquire a second temperature value and a third temperature value in the pot body;

[0068] When the second temperature value reaches a second preset temperature value and the third temperature value reaches a third preset temperature value, the controller controls the pressure relief mechanism to be in a closed state;

[0069] The controller controls the heating element to intermittently heat the pot body;

[0070] Acquiring a first positive pressure value of the pot body;

[0071] When the first positive pressure value reaches a first preset positive pressure value, the pressure relief mechanism automatically eliminates excess positive pressure, so that the pot body is kept within the first preset positive pressure value.

[0072] In the preferred technical solution of the control method of the positive and negative pressure control device for the electric rice cooker, the process of using the pressure relief mechanism to actively relieve the pressure of the cooker body in the gelatinization stage so that the interior of the cooker body forms a pressure-free state comprises the following steps:

[0073] After the rapid heating stage, the controller controls the heating element to stop heating the pot body for a period of time, and then heats the pot body in an intermittent heating manner;

[0074] Acquiring a second positive pressure value inside the pot body;

[0075] When the second positive pressure value reaches a second preset positive pressure value, the controller controls the pressure relief mechanism to be in an open state, so as to actively relieve pressure on the pot body, so that a pressure-free state is formed inside the pot body.

[0076] In the preferred technical solution of the control method of the positive and negative pressure control device for the electric rice cooker, the process of using the pressure relief mechanism to actively relieve the pressure of the cooker body in the temperature compensation stage so that a low positive pressure state is formed inside the cooker body comprises the following steps:

[0077] After the gelatinization stage, the controller controls the heating element to stop heating the pot body for a period of time, and then heats the pot body in an intermittent heating manner;

[0078] The controller controls the pressure relief mechanism to be in an open state, so as to actively relieve pressure on the pot body;

[0079] Acquire a third positive pressure value of the pot body;

[0080] When the third positive pressure value reaches a third preset positive pressure value, the controller controls the generating unit to prompt that cooking is finished.

[0081] The control method of the positive and negative pressure control device applied to the electric rice cooker of the present invention performs vacuum treatment on the cooker body through a vacuum pumping mechanism, and the interior of the cooker body is kept in a negative pressure state; the pressure relief mechanism performs automatic pressure relief treatment on the cooker body, and the interior of the cooker body is kept in a positive pressure state; the pressure relief mechanism performs active pressure relief treatment on the cooker body, and the interior of the cooker body forms a pressure-free state; the pressure relief mechanism performs active pressure relief treatment on the cooker body, and the interior of the cooker body forms a low positive pressure state. The vacuum pumping mechanism or the pressure relief mechanism is controlled by a controller to work, so that the pressure inside the cooker body can be automatically controlled within a stable and appropriate range, so that the food is heated evenly, thereby improving the taste and quality of the food.

[0082] In a third aspect, the present invention further provides an electric rice cooker, comprising the positive and negative pressure control device for the electric rice cooker as described in any one of the above-mentioned first aspects.

[0083] The electric rice cooker of the present invention comprises the above-mentioned positive and negative pressure control device for the electric rice cooker, so it has all the technical effects of the above-mentioned positive and negative pressure control device for the electric rice cooker.

[0084] In a fourth aspect, the present invention further provides an electric rice cooker, comprising a controller, wherein the controller is used to execute the control method of the positive and negative pressure control device for the electric rice cooker described in the second aspect.

[0085] The electric rice cooker of the present invention comprises the control method of the positive and negative pressure control device for the electric rice cooker, so it has all the technical effects of the positive and negative pressure control device for the electric rice cooker. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0087] Figure 1 It is a front view of a positive and negative pressure control device for an electric rice cooker of the present invention arranged in the electric rice cooker;

[0088] Figure 2 yes Figure 1 A top view of a positive and negative pressure control device for an electric rice cooker provided on the middle pot cover;

[0089] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0090] Figure 4 yes Figure 2 A cross-sectional side view of the middle pot cover showing the pressure relief mechanism in a closed state;

[0091] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0092] Figure 6 yes Figure 2 A cross-sectional side view of the middle pot cover showing the pressure relief mechanism in an open state;

[0093] Figure 7 yes Figure 6 A partial enlarged view of point C in the middle;

[0094] Figure 8 It is a flow chart of a control method of a positive and negative pressure control device applied to an electric rice cooker of the present invention;

[0095] Fig. 9 It is a flow chart of a control method of a positive and negative pressure control device applied to an electric rice cooker of the present invention;

[0096] Fig.10 It is a flow chart of another control method of a positive and negative pressure control device applied to an electric rice cooker of the present invention;

[0097] Fig.11 It is a flow chart of another control method of a positive and negative pressure control device applied to an electric rice cooker of the present invention;

[0098] Fig.12 The present invention is another flow chart of a control method of a positive and negative pressure control device applied to an electric rice cooker.

[0099] List of markers in the figure:

[0100] 1. Rice cooker; 2. Cooker body; 3. Cooker cover; 4. Positive and negative pressure control device; 5. Water tank; 6. Pressure relief mechanism; 7. First exhaust hole; 8. Pressure relief structure; 9. Mounting assembly; 10. Flexible seal; 11. Drive assembly; 12. Power assembly; 13. Pressure relief chamber; 14. Pressure relief channel; 15. Third exhaust hole; 16. Air inlet; 17. Second exhaust hole; 18. Inner cavity; 19. Opening; 20. Convex edge; 21. Shrinkage; 22. Upper part of inner cavity; 23. Lower part of inner cavity; 24. Inner lining plate; 25. Press plate; 26. Inner lining plate through hole; 27. First Annular protrusion; 28, second annular protrusion; 29, third annular protrusion; 30, mounting groove; 31, first through hole of pressure plate; 32, fourth annular protrusion; 33, fifth annular protrusion; 34, second through hole of pressure plate; 35, guide rod; 36, return spring; 37, drive plate; 38, mounting ear; 39, connecting shaft; 40, rotating shaft; 41, locking screw; 42, gasket; 43, convex ring; 44, through hole of drive plate; 45, bending part; 46, motor; 47, cam; 48, inner cover; 49, first limit plate; 50, second limit plate; 51, cover opening button. DETAILED DESCRIPTION

[0101] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the positive and negative pressure control device, control method and rice cooker for electric cookers of the present invention, and are not intended to limit the scope of protection of the present invention.

[0102] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0103] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0104] According to the following Figure 1-Figure 12 The positive and negative pressure control device, control method and rice cooker of the present application are described in detail.

[0105] See also Figure 1 and Figure 5 The first aspect of the present application provides a positive and negative pressure control device for an electric rice cooker. The electric rice cooker 1 generally includes a rice cooker body 2, a rice cooker cover 3 and a controller (not shown in the figure). The rice cooker cover 3 is located above the rice cooker body 2 and is connected to the rice cooker body 2 in an openable and closable manner. The rice cooker cover 3 and the rice cooker body 2 are preferably connected in the form of a hinge. The controller is installed on the rice cooker body 2. The controller is preferably installed on the rice cooker body 2 in an embedded manner. A corresponding control program is implanted in the controller, and the control program includes an existing control program. The positive and negative pressure control device 4 generally includes a vacuum pumping mechanism and a pressure relief mechanism 6. The vacuum pumping mechanism (not shown in the figure) and the pressure relief mechanism 6 are both installed on the rice cooker cover 3 and are both connected to the controller for communication, and are used to control the pressure discharge in the rice cooker body 2 to achieve positive and negative pressure control of the rice cooker body 2.

[0106] The positive and negative pressure control device for the electric rice cooker of the present application first evacuates the cooker body 2 through a vacuum pumping mechanism to form a negative pressure state in the cooker body 2, and then controls the inside of the cooker body 2 to maintain a positive pressure state through a pressure relief mechanism 6. The internal pressure of the cooker body 2 can be automatically controlled within a stable and appropriate range, so that the food is heated evenly, thereby improving the taste and quality of the food.

[0107] The pressure relief mechanism 6 of the present invention can ensure safety during the positive pressure control process, especially in a high pressure environment, and can respond to abnormal pressure conditions in a timely manner to ensure user safety.

[0108] See also Figure 1 In this embodiment, the rice cooker 1 further includes a water tank 5, a first temperature sensor (not shown in the figure), a second temperature sensor (not shown in the figure), an inner cover 48 (see Figure 5), a cover opening button 51, a heating element (not shown in the figure) and a sound unit (not shown in the figure). Among them, the water tank 5 is plugged into the pot body 2 to provide water to the pot body 2. The first temperature sensor is installed on the pot cover 3 by screws and is connected to the controller for communication, and is used to obtain the temperature of the upper part of the pot body 2 so as to control the electric rice cooker 1. The second temperature sensor is installed on the lower part of the pot body 2 by screws and is connected to the controller for communication, and is used to obtain the temperature of the lower part of the pot body 2 so as to control the electric rice cooker 1. The inner cover 48 is a part of the pot cover 3, which is connected to other parts of the pot cover 3 by a snap connection and a screw connection. The cover opening button 51 is installed on the pot body 2 and can be detachably snapped with the pot cover 3. The heating element is installed inside the pot body 2 by screws and is connected to the controller for communication, and is used to heat the pot body 2. The sound unit is installed on the pot body 2 and is connected to the controller for communication, so as to sound a prompt, and the sound unit can be a buzzer.

[0109] Continue reading Figure 1 In the preferred embodiment of the positive and negative pressure control device for the electric rice cooker, the pot cover 3 is provided with a first exhaust hole 7, and the first exhaust hole 7 can exhaust the pressure steam pressure inside the pot body 2. The vacuum pumping mechanism (not shown in the figure) generally includes a pressure sensor (not shown in the figure) and a vacuum pump (not shown in the figure). Among them, the pressure sensor is installed on the pot cover 3 and is connected to the controller for communication, and is used to obtain the pressure value inside the pot body 2. The vacuum pump is installed on the pot cover 3 and is connected to the controller and the first exhaust hole 7 respectively, and is used to control the vacuum pump to extract the pressure inside the pot body 2 according to the pressure value and discharge it through the first exhaust hole 7, so that a negative pressure state is formed inside the pot body 2. The pressure inside the pot body 2 is obtained by the pressure sensor, and the pressure value inside the pot body 2 is sent to the controller. The controller controls the vacuum pump to vacuum the pot body 2, so that the pot body 2 is in a negative pressure state.

[0110] In this embodiment, the pressure sensor is an existing pressure sensor, which is fixed in the pot cover 3 by screws, and its sensor head is exposed out of the pot cover 3 to obtain the pressure inside the pot body 2. The above-mentioned vacuum pump is an existing vacuum pump, which is fixed inside the pot cover 3 by screws.

[0111] See also Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7In the preferred embodiment of the positive and negative pressure control device for the rice cooker, the pressure relief mechanism 6 generally includes a pressure relief structure 8, a mounting assembly 9, a flexible seal 10, a drive assembly 11 and a power assembly 12. Among them, the pressure relief structure 8 is constructed inside the pot cover 3 and is respectively connected to the inside of the pot body 2 and the outside of the pot cover 3 for discharging pressure. The mounting assembly 9 is arranged inside the pot cover 3 for installing the flexible seal 10 and the drive assembly 11. The flexible seal 10 is arranged inside the pressure relief structure 8 and installed on the mounting assembly 9. The drive assembly 11 is arranged on the top of the pot cover 3 and installed on the mounting assembly 9, and is connected to the flexible seal 10. The power assembly 12 is respectively connected to the drive assembly 11 and the controller, and is used to drive the drive assembly 11 to drive the flexible seal 10 to retract and reset, so that the flexible seal 10 can block and conduct the inner lower part of the pressure relief structure 8 to control the pressure discharge. By providing a pressure relief structure 8, a mounting assembly 9, a flexible seal 10, a drive assembly 11 and a power assembly 12 that cooperate with each other, the pressure inside the pot body 2 can be automatically relieved or the pressure inside the pot body 2 can be relieved by a controller.

[0112] See also Figure 3 , Figure 4 and Figure 5 In the preferred embodiment of the positive and negative pressure control device for the rice cooker, the pressure relief structure 8 generally includes a pressure relief chamber 13 and a pressure relief channel 14. The pressure relief chamber 13 is constructed inside the cover 3 and has a third exhaust hole 15, and the third exhaust hole 15 is connected to the outside of the cover 3. The pressure relief channel 14 is constructed inside the cover 3 and has an air inlet 16 and a second exhaust hole 17, the air inlet 16 is connected to the inside of the cooker body 2, and the second exhaust hole 17 is connected to the pressure relief chamber 13. By setting the pressure relief chamber 13 and the pressure relief channel 14, the pressure inside the cooker body 2 can be discharged, and at the same time, the flexible seal 10 can be used to set the flexible seal 10, so that the flexible seal 10 can block the pressure relief channel 14 according to the needs to realize automatic pressure relief.

[0113] In this embodiment, the pressure relief channel 14 is located at one side of the lower portion of the pressure relief chamber 13 . The cross section of the pressure relief chamber 13 is L-shaped, and the cross section of the pressure relief channel 14 is circular.

[0114] See also Figure 4 and Figure 5In the preferred embodiment of the positive and negative pressure control device for the rice cooker, the flexible seal 10 generally includes an inner cavity 18, an opening 19, a convex edge 20 and a constriction 21. The interior of the flexible seal 10 is the inner cavity 18, the opening 19 is formed at the upper end of the flexible seal 10 and is connected to the inner cavity 18, the convex edge 20 is arranged around the outer periphery of the opening 19 and is integrally formed, and the lower part of the flexible seal 10 is configured with a constriction 21 that is tightened toward the inner cavity 18, so as to separate the inner cavity 18 into an inner cavity upper part 22 and an inner cavity lower part 23 that are connected. By processing the tightened constriction 21 at the lower part of the flexible seal 10, the lower inner cavity lower part 23 of the flexible seal 10 can be retracted under the action of the convex ring 43 of the guide rod 35 of the driving assembly 11.

[0115] In this embodiment, the flexible sealing member 10 is generally made of rubber and is shaped like a bowl.

[0116] Continue reading Figure 4 and Figure 5 In the preferred embodiment of the positive and negative pressure control device for the rice cooker, the mounting assembly 9 may generally include an inner lining plate 24 and a pressing plate 25. The inner lining plate 24 is mounted inside the cover 3, and the inner lining plate 24 has an inner lining plate through hole 26, a first annular protrusion 27, a second annular protrusion 28, a third annular protrusion 29 and a mounting groove 30. The inner lining plate through hole 26 is provided on one side of the inner lining plate 24 for mounting the flexible seal 10. The first annular protrusion 27 is formed on the upper surface of the inner lining plate 24 and is arranged around the outer edge of the inner lining plate through hole 26, and extends toward the upper side of the inner lining plate 24. The second annular protrusion 28 is formed on the upper surface of the inner lining plate 24 and is arranged around the first annular protrusion 27, and extends toward the upper side of the inner lining plate 24. The gap between the first annular protrusion 27 and the second annular protrusion 28 is a mounting groove 30 for mounting the flange 20 of the flexible seal 10. The third annular protrusion 29 is formed on the upper surface of the inner lining plate 24 and is adjacent to the second annular protrusion 28. The pressing plate 25 has a first through hole 31, a fourth annular protrusion 32, a fifth annular protrusion 33 and a second through hole 34. The first through hole 31 is formed on one side of the pressing plate 25 and corresponds to the middle of the inner lining plate through hole 26. The fourth annular protrusion 32 is formed on the lower surface of the pressing plate 25 and surrounds the first through hole 31 and extends downwardly from the pressing plate 25. The fifth annular protrusion 33 is formed on the lower surface of the pressing plate 25 and surrounds the fourth annular protrusion 32 and extends downwardly from the pressing plate 25 so that the lower end of the fifth annular protrusion 33 abuts against the flange 20 of the flexible seal 10 to fix the flange 20. The second through hole 34 is formed on one side of the pressing plate 25 and is adjacent to the fifth annular protrusion 33 so that the third annular protrusion 29 is inserted into the second through hole 34. The inner lining plate 24 and the pressing plate 25 are provided to install the flexible seal 10 and the driving assembly 11 , which is convenient and quick to install and has a reasonable structure.

[0117] Continue reading Figure 4 and Figure 5 In this embodiment, the inner lining plate 24 is mounted inside the pot cover 3 by means of a snap connection and a screw connection, and is placed above the inner cover 48. The first annular protrusion 27, the second annular protrusion 28, and the third annular protrusion 29 are all integrally constructed on the upper surface of the inner lining plate 24. The diameter of the second annular protrusion 28 is larger than that of the first annular protrusion 27. The two are arranged in the form of a ferrule. The diameter of the third annular protrusion 29 is smaller. It is located on one side of the second annular protrusion 28 and close to the middle of the pot body 2. The height of the second annular protrusion 28 is slightly higher than that of the first annular protrusion 27, so that the fifth annular protrusion 33 can be limited after being inserted into the installation groove 30.

[0118] In this embodiment, the mounting groove 30 is in a circular ring shape so that the flange 20 can be pressed into the mounting groove 30 in an adaptive manner for mounting the flexible sealing member 10 .

[0119] In this embodiment, the fourth annular protrusion 32 and the fifth annular protrusion 33 are both cylindrical in shape, the diameter of the fifth annular protrusion 33 is larger than the diameter of the fourth annular protrusion 32, and the length of the fifth annular protrusion 33 is slightly larger than the length of the fourth annular protrusion 32, so that the lower end of the fifth annular protrusion 33 is inserted into the mounting groove 30.

[0120] See also Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7In the preferred embodiment of the positive and negative pressure control device for the rice cooker, the driving assembly 11 generally includes a guide rod 35, a reset spring 36, a driving plate 37, a mounting ear 38, a connecting shaft 39, a rotating shaft 40, a locking screw 41 and a gasket 42. The guide rod 35 is inserted into the first through hole 31 of the pressure plate and the through hole 26 of the inner lining plate, and the lower end of the guide rod 35 has a convex ring 43, which is inserted into the lower part 23 of the inner cavity of the flexible seal 10 and is limited by the constriction 21. The convex ring 43 and the constriction 21 are connected in the form of an interference fit, so that when the guide rod 35 rises, the lower part of the flexible seal 10 can be retracted upward, and then the bottom surface of the flexible seal 10 and the upper end of the second exhaust hole 17 are separated, so that the pressure relief channel 14 and the pressure relief chamber 13 are connected, otherwise they are blocked. The guide rod 35 and the convex ring 43 are integrally formed to improve firmness. The return spring 36 is sleeved on the guide rod 35, the upper end of the return spring 36 abuts against the lower edge of the fourth annular protrusion 32, and the lower end of the return spring 36 abuts against the convex ring 43, which is used to limit the return spring 36. The return spring 36 is used to provide elastic driving force to the guide rod 35. The drive plate 37 has a drive plate through hole 44 and a bending portion 45. The drive plate through hole 44 is opened at one end of the drive plate 37 and corresponds to the first through hole 31 of the pressure plate. The drive plate 37 is configured with a bending portion 45 so that the other end of the drive plate 37 is tilted. The locking screw 41 and the gasket 42 are both installed in the threads of the drive plate through hole 44 and the upper end of the guide rod 35, so that the guide rod 35 and the drive plate 37 are connected, so that the drive plate 37 drives the guide rod 35 to rise or fall. The rotating shaft 40 is inserted into the first through hole 31 of the pressure plate and is installed in the second through hole 34 of the pressure plate in the form of a thread. The upper end of the rotating shaft 40 has a transverse mounting through hole (not shown in the figure). The mounting ear 38 is integrally constructed below the middle of the driving plate 37 and corresponds to the mounting through hole. The mounting ear 38 and the mounting through hole are plugged in through the connecting shaft 39 so that the driving plate 37 moves with the rotating shaft 40 as the axis and in the form of a lever, such as a seesaw.

[0121] See also Figure 3 , Figure 4 and Figure 5 In the preferred embodiment of the positive and negative pressure control device for the rice cooker, the power assembly 12 generally includes a motor 46 and a cam 47. The motor 46 is mounted on the cover 3 by screws and is connected to the controller by communication, so as to control the operation of the motor 46. The cam 47 is located on the upper part of the other end of the driving plate 37 and is clamped, welded or screwed to the power output shaft of the motor 46, so that the cam 47 presses the other end of the driving plate 37 to descend, so that one end of the driving plate 37 is raised, so as to drive the guide rod 35 to rise, so as to promote the bending of the flexible seal 10, and then the lower part 23 of the inner cavity of the flexible seal 10 is retracted, so that the bottom surface of the flexible seal 10 is separated from the second exhaust hole 17, so that the pressure is discharged through the air inlet 16, the pressure relief channel 14, the second exhaust hole 17, the pressure relief chamber 13, and the third exhaust hole 15.

[0122] See also Figure 3 In this embodiment, the power assembly 12 further includes a first limit plate 49 and a second limit plate 50. The first limit plate 49 is mounted on the pot cover 3 by screws and is located above the cam 47 for limiting position. The second limit plate 50 is mounted on the pot cover 3 by screws and is located on one side of the cam 47 for limiting position.

[0123] See also Figure 8 In a second aspect, the present invention further provides a control method for a positive and negative pressure control device applied to an electric rice cooker, the control method comprising the following steps:

[0124] Step S01: using a vacuuming mechanism to vacuumize the pot body 1 in the low-temperature water absorption stage, so that the interior of the pot body 1 is maintained in a negative pressure state;

[0125] Step S02: using the pressure relief mechanism 6 to automatically relieve pressure on the pot body 1 during the rapid temperature rise phase, so that the interior of the pot body 1 is maintained in a positive pressure state;

[0126] Step S03: using the pressure relief mechanism 6 to actively relieve pressure on the pot body 1 in the gelatinization stage, so that the interior of the pot body 1 forms a pressure-free state;

[0127] Step S04: using the pressure relief mechanism 6 to actively relieve pressure on the pot body 1 during the temperature compensation stage, so that a low positive pressure state is formed inside the pot body 1 .

[0128] The control method of the positive and negative pressure control device applied to the electric rice cooker of the present invention performs vacuum treatment on the pot body 1 through the vacuum pumping mechanism, and the interior of the pot body 1 is kept in a negative pressure state. The pressure relief mechanism 6 automatically performs pressure relief treatment on the pot body 1, and the interior of the pot body 1 is kept in a positive pressure state. The pressure relief mechanism 6 performs active pressure relief treatment on the pot body 1, and the interior of the pot body 1 forms a pressure-free state. The pressure relief mechanism 6 performs active pressure relief treatment on the pot body 1, and the interior of the pot body 1 forms a low positive pressure state. The internal pressure of the pot body 1 can be automatically controlled within a stable and appropriate range, so that the food is heated evenly, thereby improving the taste and quality of the food.

[0129] In this embodiment, when the motor 46 drives the cam 47 to rotate counterclockwise, the cam 47 is arranged horizontally, and the cam 47 does not press against the driving plate 37, and this working condition is the closed state of the pressure relief mechanism 66. When the motor 46 drives the cam 47 to rotate clockwise, the cam 47 is arranged vertically, and the cam 47 presses against the driving plate 37, and this working condition is the open state of the pressure relief mechanism 66.

[0130] See also Fig. 9In the preferred embodiment of the control method of the positive and negative pressure control device applied to the electric rice cooker, in step S01: using a vacuum pumping mechanism to vacuum the cooker body 1 in the low-temperature water absorption stage so that the interior of the cooker body 1 is maintained in a negative pressure state, comprising the following steps:

[0131] Step S011: the controller controls the heating element to heat the pot body 1;

[0132] Step S012: obtaining a first temperature value inside the pot body 1;

[0133] Step S013: When the first temperature value reaches the first preset temperature value, the controller controls the pressure relief mechanism 6 to be in a closed state and controls the vacuum mechanism to vacuum the pot body 1;

[0134] Step S014: obtaining a first negative pressure value of the pot body 1 during the vacuuming process;

[0135] Step S015: When the first negative pressure value reaches the first preset negative pressure value, the vacuum pumping mechanism temporarily stops vacuum pumping;

[0136] Step S016: obtaining a second negative pressure value of the pot body 1 after temporarily stopping vacuuming;

[0137] Step S017: When the second negative pressure value reaches the second preset negative pressure value, the controller controls the vacuum pumping mechanism to perform vacuum pumping, so that the internal pressure of the pot body 1 is between the first preset negative pressure value and the second negative pressure value.

[0138] In this embodiment, during the low-temperature water absorption stage of the pot body 1, the heating temperature of the pot body 1, i.e., the first temperature value, is obtained in real time. The first temperature value can be 40° or 45°, and the first preset temperature value is preferably 50°. When the first temperature value reaches 50°, the pressure relief mechanism 6 is closed and the vacuum mechanism is started to vacuum the pot body 1. During the vacuuming process, the negative pressure value inside the pot body 1, i.e., the first negative pressure value, is obtained in real time. The first negative pressure value can be -10kpa or -20kpa, and the first preset negative pressure value is preferably -40kpa. When the first negative pressure value reaches -40kpa, the vacuum mechanism temporarily stops vacuuming. The negative pressure value inside the pot body 1 after temporarily stopping the vacuuming, i.e., the second negative pressure value, is obtained in real time. The second negative pressure value can be -15kpa or -20kpa. The second preset negative pressure value is preferably -30kpa. When the second negative pressure value reaches -30kpa, the vacuuming mechanism performs vacuuming again, and repeats this process 2-10 times. The time is generally 15-25 minutes, preferably 20 minutes.

[0139] See also Fig.10In the preferred embodiment of the control method of the positive and negative pressure control device applied to the rice cooker, in step S02: the pressure relief mechanism 6 is used to automatically relieve the pressure of the cooker body 1 in the rapid temperature rise stage so that the inside of the cooker body 1 is kept in a positive pressure state, comprising the following steps:

[0140] Step S021: After the low-temperature water absorption stage, the controller controls the heating element to heat the pot body 1 at full power, and controls the pressure relief mechanism 6 to be in an open state;

[0141] Step S022: obtaining the second temperature value and the third temperature value in the pot body 1;

[0142] Step S023: when the second temperature value reaches the second preset temperature value and the third temperature value reaches the third preset temperature value, the controller controls the pressure relief mechanism 6 to be in a closed state;

[0143] Step S024: the controller controls the heating element to intermittently heat the pot body 1;

[0144] Step S025: obtaining a first positive pressure value of the pot body 1;

[0145] Step S026: When the first positive pressure value reaches the first preset positive pressure value, the pressure relief mechanism 6 automatically eliminates the excess positive pressure, so that the pot body 1 is maintained within the first preset positive pressure value.

[0146] In this embodiment, when the pot body 1 is in the rapid heating stage, the temperature value of the upper part of the pot body 1, that is, the second temperature value, is obtained in real time. The second temperature value can be 40° or 55°. The temperature value of the lower part of the pot body 1, that is, the third temperature value, is obtained in real time. The third temperature value can be 60° or 65°. The second preset temperature value is preferably 59 degrees, and the third preset temperature value is preferably 70 degrees. The pressure relief mechanism 6 is in a closed state, and the first positive pressure value of the pot body 1 is obtained in real time. The first positive pressure value can be 10kpa or 15kpa. The first preset positive pressure value is preferably 18kpa. When the first positive pressure value reaches 18kpa, the excess pressure will be automatically discharged through the pressure relief mechanism 6, so that the pot body 1 is always kept below 18kpa.

[0147] See also Fig.11 In the preferred embodiment of the control method of the positive and negative pressure control device applied to the rice cooker, in step S03: using the pressure relief mechanism 6 to actively relieve the pressure of the rice cooker body 1 in the gelatinization stage, so that the inside of the rice cooker body 1 forms a pressure-free state, comprising the following steps:

[0148] Step S031: After the rapid heating stage, the controller controls the heating element to stop heating the pot body 1 for a period of time, and then heats the pot body 1 in an intermittent heating manner;

[0149] Step S032: obtaining a second positive pressure value inside the pot body 1;

[0150] Step S033: When the second positive pressure value reaches the second preset positive pressure value, the controller controls the pressure relief mechanism 6 to be in an open state, so as to actively relieve pressure on the pot body 1 so as to form a pressure-free state inside the pot body 1.

[0151] In this embodiment, during the gelatinization stage, intermittent heating of the pot body 1 generally refers to heating at full power for 8 seconds and stopping for 8 seconds. The second positive pressure value inside the pot body 1 obtained in real time can be 10kpa or 8kpa. The second preset positive pressure value is preferably 5kpa. When the second positive pressure value reaches 5kpa, the pressure relief mechanism 6 is in an open state and actively relieves pressure until a pressure-free state is formed inside the pot body 1.

[0152] See also Fig.12 In the preferred embodiment of the control method of the positive and negative pressure control device applied to the electric rice cooker, in step 04: using the pressure relief mechanism 6 to actively relieve the pressure of the cooker body 1 in the temperature compensation stage, so that the inside of the cooker body 1 forms a low positive pressure state, comprising the following steps:

[0153] Step 041: After the gelatinization stage, the controller controls the heating element to stop heating the pot body 1 for a period of time, and then heats the pot body 1 in an intermittent heating manner;

[0154] Step 042: The controller controls the pressure relief mechanism 6 to be in an open state, so as to actively relieve pressure on the pot body 1;

[0155] Step 043: Obtain the third positive pressure value of the pot body 1;

[0156] Step 044: When the third positive pressure value reaches the third preset positive pressure value, the controller controls the generating unit to prompt that cooking is finished.

[0157] In this embodiment, when the pot body 1 is in the warming stage, intermittent heating generally refers to heating for 4 seconds and stopping for 13 seconds. The third positive pressure value inside the pot body 1 obtained in real time can be 5kpa or 4kpa. The third preset positive pressure value is preferably 2kpa. When the third positive pressure value is 2kpa, the generating unit prompts that cooking is over.

[0158] In a third aspect, the present invention further provides an electric rice cooker, the electric rice cooker 1 comprising the positive and negative pressure control device for the electric rice cooker of the first aspect. Therefore, it has all the technical effects of the positive and negative pressure control device for the electric rice cooker, and this embodiment will not be repeated.

[0159] In a fourth aspect, the present invention also provides an electric rice cooker, the electric rice cooker 1 comprises a controller, and the controller is used to execute the control method of the positive and negative pressure control device for the electric rice cooker described in the second aspect. Therefore, it has all the technical effects of the control method of the positive and negative pressure control device for the electric rice cooker, and this embodiment will not be repeated.

[0160] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0161] It should be noted that although the detailed steps of the method of the present application are described in detail above, without departing from the basic principles of the present application, technical personnel in this field can combine, split and change the order of the above steps. The modified technical solution does not change the basic concept of the present application and therefore falls within the scope of protection of the present application.

[0162] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A positive and negative pressure control device for an electric rice cooker, characterized in that: The electric rice cooker (1) comprises a cooker body (2), a cooker cover (3) and a controller; The pot cover (3) is located above the pot body (2) and is connected to the pot body (2) in an openable and closable manner, and the controller is installed on the pot body (2); The positive and negative pressure control device (4) comprises a vacuum pumping mechanism and a pressure relief mechanism (6); The vacuum extraction mechanism and the pressure relief mechanism (6) are both installed on the pot cover (3) and are both connected to the controller for communication, and are used to control the pressure discharge in the pot body (2) to achieve positive and negative pressure control of the pot body (2).

2. The positive and negative pressure control device for an electric rice cooker according to claim 1, characterized in that: The pot cover (3) is provided with a first exhaust hole (7); The vacuum pumping mechanism includes a pressure sensor and a vacuum pump; The pressure sensor is installed on the pot cover (3) and is in communication connection with the controller, and is used to obtain the pressure value inside the pot body (2); The vacuum pump is mounted on the pot cover (3) and is respectively connected to the controller and the first exhaust hole (7), and is used to control the vacuum pump according to the pressure value to extract the internal pressure of the pot body (2) and discharge it through the first exhaust hole (7), so that a negative pressure state is formed inside the pot body (2).

3. The positive and negative pressure control device for an electric rice cooker according to claim 1, characterized in that: The pressure relief mechanism (6) comprises a pressure relief structure (8), a mounting assembly (9), a flexible sealing element (10), a driving assembly (11) and a power assembly (12); The pressure relief structure (8) is constructed inside the pot cover (3) and is respectively connected to the inside of the pot body (2) and the outside of the pot cover (3) for discharging the pressure; The mounting assembly (9) is arranged inside the pot cover (3) and is used to mount the flexible sealing member (10) and the driving assembly (11); The flexible sealing member (10) is arranged inside the pressure relief structure (8) and mounted on the mounting assembly (9); The driving component (11) is arranged on the upper surface of the pot cover (3) and mounted on the mounting component (9), and is connected to the flexible sealing component (10); The power component (12) is connected to the drive component (11) and the controller respectively, and is used to drive the drive component (11) to drive the flexible seal (10) to retract or reset, so that the flexible seal (10) can block or open the inner lower part of the pressure relief structure (8) to control the pressure discharge.

4. The positive and negative pressure control device for an electric rice cooker according to claim 3, characterized in that: The pressure relief structure (8) comprises a pressure relief chamber (13) and a pressure relief channel (14); The pressure relief chamber (13) is constructed inside the pot cover (3) and has a third exhaust hole (15), and the third exhaust hole (15) is connected to the outside of the pot cover (3); The pressure relief channel (14) is constructed inside the pot cover (3) and has an air inlet hole (16) and a second air outlet hole, the air inlet hole (16) is connected to the inside of the pot body (2), and the second air outlet hole is connected to the pressure relief chamber (13).

5. The positive and negative pressure control device for an electric rice cooker according to claim 4, characterized in that: The flexible sealing member (10) comprises an inner cavity (18), an opening (19), a convex edge (20) and a constricted opening (21); The interior of the flexible seal (10) is the inner cavity (18), the opening (19) is formed at the upper end of the flexible seal (10) and is connected to the inner cavity (18), the convex edge (20) is arranged around the outer periphery of the opening (19) and is integrally formed, and the lower part of the flexible seal (10) is configured with the constriction (21) that is tightened toward the inner cavity (18) so as to separate the inner cavity (18) into an upper inner cavity part (23) and a lower inner cavity part (24) that are connected.

6. The positive and negative pressure control device for an electric rice cooker according to claim 5, characterized in that: The mounting assembly (9) comprises an inner lining plate (24) and a pressing plate (25); The inner lining plate (24) is installed inside the pot cover (3), and the inner lining plate (24) has an inner lining plate through hole (26), a first annular protrusion (27), a second annular protrusion (28), a third annular protrusion (29) and a mounting groove (30); The inner lining plate through hole (26) is opened on one side of the inner lining plate (24) and is used for installing the flexible sealing member (10); The first annular protrusion (27) is formed on the upper surface of the inner lining plate (24) and is arranged around the outer edge of the inner lining plate through hole (26), and extends upwardly from the inner lining plate (24); The second annular protrusion (28) is formed on the upper surface of the inner lining plate (24) and is arranged around the first annular protrusion (27), and extends upwardly from the inner lining plate (24); The gap between the first annular protrusion (27) and the second annular protrusion (28) is the mounting groove (30) for mounting the flange (20) of the flexible seal (10); The third annular protrusion (29) is formed on the upper surface of the inner lining plate (24) and is adjacent to the second annular protrusion (28); The pressing plate (25) has a first pressing plate through hole (31), a fourth annular protrusion (32), a fifth annular protrusion (33) and a second pressing plate through hole (34); The first through hole (31) of the pressing plate is opened on one side of the pressing plate (25) and corresponds to the middle of the through hole (26) of the inner lining plate; The fourth annular protrusion (32) is formed on the bottom of the pressing plate (25) and is arranged around the first through hole (31) of the pressing plate, and extends toward the bottom of the pressing plate (25); The fifth annular protrusion (33) is formed below the pressing plate (25) and is arranged around the fourth annular protrusion (32), and extends downwardly from the pressing plate (25), so that the lower end of the fifth annular protrusion (33) abuts against the convex edge (20) of the flexible sealing member (10) to fix the convex edge (20); The second through hole (34) of the pressing plate is opened on one side of the pressing plate (25) and is adjacent to the fifth annular protrusion (3), so that the third annular protrusion (29) can be inserted into the second through hole (34) of the pressing plate.

7. The positive and negative pressure control device for an electric rice cooker according to claim 6, characterized in that: The driving assembly (11) comprises a guide rod (35), a return spring (36), a driving plate (37), a mounting ear (38), a connecting shaft (39), a rotating shaft (40), a locking screw (41) and a gasket (42); The guide rod (35) is inserted into the first through hole (31) of the pressure plate and the through hole (26) of the inner lining plate, and the lower end of the guide rod (35) has a convex ring (43), and the convex ring (43) is inserted into the lower part (23) of the inner cavity of the flexible sealing member (10) and is limited by the constriction (21); The return spring sleeve (36) is mounted on the guide rod (35), the upper end of the return spring (36) abuts against the lower edge of the fourth annular protrusion (32), and the lower end of the return spring (36) abuts against the protruding ring (32), so as to limit the return spring (36); The driving plate (37) has a driving plate through hole (44) and a bending portion (45), wherein the driving plate through hole (44) is opened at one end of the driving plate (37) and corresponds to the first through hole (31) of the pressing plate, and the driving plate (37) is configured with the bending portion (45) so that the other end of the driving plate (37) is tilted; The locking screw (41) and the gasket (42) are both installed on the driving plate through hole (44) and the upper end of the guide rod (35); The rotating shaft (40) is inserted into the first through hole (31) of the pressing plate and installed in the second through hole (34) of the pressing plate, and the upper end of the rotating shaft (40) has a transverse installation through hole; The mounting ear (38) is constructed below the middle of the driving plate (37) and corresponds to the mounting through hole. The mounting ear (38) and the mounting through hole are plugged into each other via the connecting shaft (39), so that the driving plate (37) moves in the form of a lever with the rotating shaft (40) as the axis.

8. The positive and negative pressure control device for an electric rice cooker according to claim 7, characterized in that: The power assembly (12) comprises a motor (46) and a cam (47); The motor (46) is mounted on the pot cover (3) and connected to the controller; The cam (47) is located at the upper part of the other end of the driving plate (37) and is connected to the power output shaft of the motor (46). The cam (47) is used to press the other end of the driving plate (37) to descend, so that one end of the driving plate (37) is lifted to drive the guide rod (35) to rise, and is used to lift the lower part (23) of the inner cavity of the flexible seal (10) to cause the flexible seal (10) to bend, so that the bottom surface of the flexible seal (10) and the second exhaust hole (17) are separated, so that the pressure is discharged through the air inlet hole (16), the pressure relief channel (14), the second exhaust hole (17), the pressure relief chamber (13), and the third exhaust hole (15).

9. The positive and negative pressure control device for an electric rice cooker according to claim 1, characterized in that: The electric rice cooker (1) further comprises a heating element, a first temperature sensor, a second temperature sensor and a sound generating unit; The heating element is installed inside the pot body (2) and is in communication connection with the controller, and is used to heat the pot body (2); The first temperature sensor is mounted on the pot cover (3) and is in communication connection with the controller so as to obtain the temperature of the upper part of the pot body (2); The second temperature sensor is installed inside the pot body (2) and is in communication connection with the controller so as to obtain the temperature of the lower part of the pot body (2); The sound-generating unit is installed on the pot body (2) and is in communication connection with the controller so as to generate sound prompts.

10. A control method for a positive and negative pressure control device for an electric rice cooker applied to any one of claims 1 to 9, characterized in that: The control method comprises the following steps: Using the vacuum pumping mechanism to perform vacuum pumping on the pot body (2) in the low-temperature water absorption stage, so that the interior of the pot body (2) is maintained in a negative pressure state; The pressure relief mechanism (6) is used to automatically relieve pressure on the pot body (2) during the rapid temperature rise phase, so that the interior of the pot body (2) is maintained in a positive pressure state; Actively relieving the pressure of the pot body (2) during the gelatinization stage by using the pressure relief mechanism (6) so that the interior of the pot body (2) forms a pressure-free state; The pressure relief mechanism (6) is used to actively relieve pressure on the pot body (2) during the temperature compensation stage, so that a low positive pressure state is formed inside the pot body (2).

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