Cooking appliance with multiple safety locking mechanisms

Abstract

A cooking appliance with a multiple safety locking mechanism, comprising a base, an inner pot disposed within the base, and a pot lid capable of covering the inner pot. The inner pot has a rigid pot rim protruding outward. The pot lid includes a lid body and a rigid member disposed below the lid body. The inner pot and the rigid member together form a cooking cavity. The tail of the pot lid is hinged to the base and can move in an opening and closing manner. An activatable latch is provided at the front of the pot lid, and a latch seat is provided on the base. The latch seat is configured to push the activatable latch to rotate when the pot lid is closed onto the base and to allow the activatable latch to be latched and locked onto the latch seat when the pot lid is fully closed onto the base, thereby achieving the latching of the pot lid and the base to form a first-level lock. The beneficial technical effect of the present invention is that the stop block can lock the activatable latch when the inner pot locking mechanism forms a second-level lock. After the activatable latch is locked, it cannot be disengaged from the latch seat, that is, the pot lid cannot be opened at this time.

Description

Technical Field

[0001] The invention relates to the technical field related to pressure cooking appliances, and in particular to a pressure cooker with multiple safety locking mechanisms. Background Art

[0002] Pressure cookers are common food cooking appliances in our daily lives. Pressure cookers heat water and food in a sealed inner pot. When the water and food are heated, a large amount of water vapor is generated. As the water vapor continues to increase, the pressure in the pressure cooker increases. Under the action of high temperature and high pressure, the pressure cooker can cook food quickly, greatly shortening the cooking time of food. However, the pressure in the inner pot of the pressure cooker is very high during cooking. In order to prevent the lid of the pressure cooker from accidentally opening and causing harm to the user under high temperature and high pressure cooking conditions, the lid and the inner pot need to be locked. People have invented a caliper-type locking method for the lid and the inner pot, and integrated this locking method into the reversible lid. For example, a Chinese invention patent with application number 201910526202.2 discloses a cooking utensil with a double safety locking structure, wherein the cooking utensil comprises a pot base, an inner pot placed on the pot base, and a pot cover hingedly connected to the rear end of the pot base in a flip manner, wherein the inner pot has a rigid pot rim protruding outward, and the pot cover comprises an outer cover and a rigid member installed under the outer cover, wherein the pot cover is used to cover the pot mouth of the inner pot based on a lid closing action; the cooking utensil also comprises a locking mechanism, wherein the locking mechanism is used to complete a double locking mechanism, wherein the double locking mechanism includes not only locking the rigid member with the rigid pot rim, but also locking one of the outer cover or the rigid member with the pot base when the pot base and the pot cover are closed; wherein the locking mechanism is used to automatically complete the double locking mechanism in response to a lid closing instruction action of the pot cover that allows the lid to be flipped and closed, thereby realizing a flip lid closing, and the locking mechanism is also used to automatically release the double locking mechanism in response to an allowed lid opening instruction, thereby realizing one-touch lid opening. The pot cover is also provided with a self-locking mechanism to prevent the pot cover from being opened when the inner pot is at high temperature and high pressure; further, the locking mechanism also includes an electric driver arranged on the outer cover, the electric driver is connected to the support frame in a transmission manner, and the electric driver is used to drive the support frame to move toward the center direction of the outer cover in response to the cover closing instruction action, and can also move toward the outer side direction of the outer cover in response to the cover opening instruction transmitted by the unlocking device. It is not difficult to understand from the technical content disclosed in this invention that the added electric driver is used to drive the support frame to move, although the convenience of the cooking utensil when the pot cover is opened and closed is improved, such a setting will make the action correlation of the double locking mechanism worse, and the anti-opening cover locking is mainly carried out by means of the self-locking mechanism arranged on the pot cover. When the self-locking mechanism does not work, when the pot cover is opened, the electric driver may not be able to open the locking mechanism due to the influence of the pressure in the pot, and the inner pot may be lifted by the pot cover to cause splashing injury. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a cooking appliance with a multiple safety locking mechanism, which includes a base, an inner pot disposed in the base, and a pot lid capable of covering the inner pot. The inner pot has a rigid pot rim protruding outward. The pot lid includes a lid body and a rigid member disposed under the lid body. The inner pot and the rigid member jointly form a cooking cavity. The tail of the pot lid is hinged to the base and can move in an opening and closing manner. An activatable lock is provided at the front of the pot lid, and a lock seat is provided on the base. When the pot lid is covered on the base, the lock seat is configured to push the activatable lock to rotate, and when the pot lid is completely covered on the base, the activatable lock is latched and locked on the lock seat to form a first locking between the pot lid and the base. It is characterized in that an inner pot locking mechanism is provided on the pot lid. The inner pot locking mechanism includes a bracket, a metal lock claw, and a driving member. The bracket is movably arranged on the lid body. The metal lock claw is installed on the bracket and can move with the bracket. The driving member can drive the bracket and the metal lock claw to move towards the center of the lid body, so as to lock the rigid member and the rigid pot rim of the inner pot through the metal lock claw to form a second locking. A stop block capable of moving synchronously with the bracket is further provided on the pot lid. When the inner pot locking mechanism forms the second locking, the stop block moves to a position where it can prevent the activatable lock from rotating, thereby realizing the locking of the activatable lock. When the inner pot locking mechanism releases the second locking, the stop block leaves the activatable lock to release the locking of the activatable lock, so that the activatable lock can rotate.

[0004] Wherein, the tail and the front of the pot lid are in a relative positional relationship, which is not a specific limitation on a specific part of the pot lid. In a specific embodiment, the rear part of the pot lid is hinged to the base, then the hinged part of the pot lid to the base is defined as the tail of the pot lid. Correspondingly, the front part of the pot lid corresponding to the hinged position of the pot lid is defined as the front of the pot lid.

[0005] Wherein, the stop block is a component provided on the pot lid that can move synchronously with the movement of the bracket, and the stop block is used to realize or release the locking of the activatable lock.

[0006] In which, the stop block can move synchronously with the bracket, and the movement modes of the stop block are various, which can be moving, swinging, rotating or rolling, etc.; in one embodiment, the stop block is arranged on the intermediate connecting arm mentioned below, and one end of the intermediate connecting arm is transmission connected to the bracket. When the bracket moves toward the center direction of the cover body and drives the intermediate connecting arm to swing forward, the stop block follows the intermediate connecting arm to swing to a position that can hinder the rotation of the movable lock; on the contrary, when the bracket moves toward the outer edge direction of the cover body and drives the intermediate connecting arm to swing in the opposite direction, the stop block follows the intermediate connecting arm to swing away from the movable lock.

[0007] According to the above technical scheme, compared with the prior art, the beneficial technical effect of the present invention is that: the stop block can lock the movable lock buckle when the inner pot locking mechanism forms the second lock, and the movable lock buckle cannot be separated from the lock buckle seat after being locked, that is, the pot cover cannot be opened at this time; only after the inner pot locking mechanism releases the second lock, the stop block leaves the movable lock buckle to release the lock of the movable lock buckle, the movable lock buckle can be rotated and separated from the lock buckle seat, and the pot cover can be opened at this time; in this way, through the synchronous movement of the stop block and the bracket, it can be effectively ensured that the first lock cannot be released after the second lock is formed, and when opening the cover, the first lock can only be released by releasing the second lock first, which well ensures that the pot cover cannot be opened when the cooking utensil is performing high temperature and high pressure cooking, and avoids the pot cover lifting the inner pot to cause splashing damage when the pot cover is opened, thereby greatly improving the safety of the cooking utensil.

[0008] In order to facilitate opening the pot lid, a further technical solution may be that the pot lid is further provided with an opening button that is transmission-connected to the movable lock, and the opening button is used to push the movable lock to overcome the resistance of the movable lock spring and drive the movable lock to rotate and disengage from the lock seat, thereby releasing the first lock. The resistance of the movable lock spring refers to the force of the movable lock spring acting on the movable lock to hinder the rotation of the movable lock. In this way, when the stop block releases the lock of the movable lock, by pressing the opening button, the movable lock can be pushed to rotate to release the first lock, thereby conveniently opening the pot lid and realizing one-button opening.

[0009] The stop block can be set in various forms. A further technical solution can also be that an intermediate connecting arm is also provided on the pot cover, and the intermediate connecting arm is swingably arranged between the driving member and the bracket. The intermediate connecting arm includes a driving connecting end transmission-connected to the driving member, a bracket connecting end transmission-connected to the bracket, a stop end provided with the stop block, and a rotating shaft end. The driving member can drive the intermediate connecting arm to swing around the rotating shaft end through the driving connecting end. When the intermediate connecting arm swings forward, the bracket connecting end of the intermediate connecting arm drives the bracket to move toward the center direction of the cover body to achieve the second locking. The stop block can follow the stop end of the intermediate connecting arm to move to a position that can hinder the rotation of the movable lock buckle to achieve locking of the movable lock buckle; when the intermediate connecting arm swings reversely, the bracket connecting end of the intermediate connecting arm drives the bracket to move toward the outer edge direction of the cover body to release the second locking. The stop block can follow the stop end of the intermediate connecting arm to leave the movable lock buckle to release the locking of the movable lock buckle so that the movable lock buckle can rotate. The intermediate connecting arm is a component provided between the driving member and the bracket for transmission connection. When the intermediate connecting arm swings, it can simultaneously drive the bracket and the stop block to move so that the stop block can move synchronously with the bracket. There are various ways to set the stop block on the intermediate connecting arm. The stop block can be connected to the intermediate connecting arm or formed integrally with the intermediate connecting arm. In any case, the synchronous movement of the bracket and the stop block is well achieved through the intermediate connecting arm, which well ensures that the pot cover cannot be opened by driving the active lock to rotate when the cooking utensil is performing high-temperature and high-pressure cooking, thereby ensuring the safety of the cooking utensil.

[0010] In order to control the pressure in the cooking content cavity, a further technical solution may be that the pot cover is also provided with an exhaust valve, the exhaust valve includes a valve seat provided with an exhaust channel and a weight provided on the valve seat, the exhaust channel connects the cooking content cavity and the space outside the pot, the weight is used to block the air outlet of the exhaust channel to close the exhaust channel; the pot cover also includes a movably provided exhaust rod, the exhaust rod is used to push the weight away from the air outlet of the exhaust channel to open the exhaust channel. In this way, when the weight closes the exhaust channel, the pressure in the cooking content cavity can gradually increase with the cooking process; and when the exhaust rod pushes the weight to open the exhaust channel, the high-pressure steam in the cooking content cavity can be discharged from the exhaust channel to the space outside the pot to achieve the purpose of reducing the pressure in the cooking content cavity.

[0011] In order to further improve the safety of the cooking appliance, a further technical solution may also be that a locking mechanism capable of responding to the air pressure or temperature inside the inner pot is further provided on the pot lid. The locking mechanism includes a locking post, and an engaging portion cooperating with the locking post is provided on the intermediate connecting arm or the bracket. The locking post is configured to extend into the engaging portion when the air pressure or temperature inside the inner pot is higher than a threshold value, so that the intermediate connecting arm or the bracket cannot move, thereby realizing self-locking of the pot lid. Among them, the setting manner of the engaging portion cooperating with the locking post is diverse. The first implementation manner is that the engaging portion is provided on the intermediate connecting arm. When the locking post extends into the engaging portion provided on the intermediate connecting arm, the locking post can prevent the intermediate connecting arm from moving, so that the bracket cannot move towards the outer edge direction of the lid body, and the stop block provided on the intermediate connecting arm is also kept at a position that hinders the rotation of the movable lock catch, so that the movable lock catch cannot rotate, and the pot lid is self-locked. The second implementation manner is that the engaging portion is provided on the bracket. When the locking post extends into the engaging portion provided on the bracket, the locking post can prevent the bracket from moving towards the outer edge direction of the lid body, and the intermediate connecting arm is in transmission connection with the bracket. The intermediate connecting arm is restricted by the bracket and cannot swing, which also causes the stop block provided on the intermediate connecting arm to move away from the position that hinders the rotation of the movable lock catch, so that the movable lock catch cannot rotate, and the pot lid is self-locked. In this way, the safety of the cooking appliance is further improved through the locking mechanism.

[0012] When the pressure inside the cooking cavity is greater than the atmospheric pressure outside the pot, the rigid member will bear a relatively large pressure, and a great deal of force is required for the inner pot locking mechanism to unlock the second-stage lock. To ensure that the inner pot locking mechanism can simply and effectively unlock the second-stage lock, a further technical solution may be that a driving slider is also provided between the driving member and the intermediate connecting arm. The driving slider can move back and forth on the pot lid under the drive of the driving member. A driving arm and the exhaust rod are provided on the driving slider. The driving arm is in transmission connection with the intermediate connecting arm. When the driving slider moves forward under the action of the driving member, the driving arm follows the driving slider to move forward and drives the intermediate connecting arm to swing forward, and the intermediate connecting arm drives the bracket to move towards the center of the lid body to achieve the second-stage lock. At the same time, the exhaust rod follows the driving slider to move forward and moves away from the weight, and the weight plugs the air outlet of the exhaust passage under its own action; when the driving slider moves backward under the action of the driving member, the exhaust rod follows the driving slider to move backward and pushes the weight away from the air outlet of the exhaust passage; a bracket spring is also provided between the bracket and the lid body. The bracket spring is used to drive the bracket to move towards the outer edge of the pot lid to release the second-stage lock when the driving member drives the driving slider to move backward and the pressure inside the cooking cavity is basically balanced with the pressure outside the pot. At the same time, the bracket drives the intermediate connecting arm to swing in the reverse direction, and the stop block can follow the stop end of the intermediate connecting arm to leave the movable lock to release the locking of the movable lock so that the movable lock can rotate. Wherein, the exhaust rod can move away from or push the weight under the drive of the driving member to control the closing and opening of the exhaust passage; thus, before releasing the second-stage lock, the driving member is first used to drive the exhaust rod to open the exhaust passage for exhaust. When the pressure inside the cooking cavity is basically balanced with the pressure outside the pot, the bracket spring is used to drive the bracket to move towards the outer edge of the pot lid to release the second-stage lock.

[0013] To enable the driving member provided inside the pot lid to operate normally, a further technical solution may be that an exhaust rod sealing ring is also provided on the pot lid. The exhaust rod sealing ring is arranged between the exhaust valve and the exhaust rod. The exhaust rod sealing ring is used to prevent the steam discharged from the exhaust valve from entering the pot lid along the exhaust rod. In this way, through the blockage of the exhaust rod sealing ring, the driving member is well protected from being wetted by the steam discharged from the exhaust valve, reducing the probability of the driving member malfunctioning.

[0014] In order to better achieve the snap - fit of the pot lid and the base to form the first - stage locking, a further technical solution may be that the latch seat is provided with a barb, the barb has an inclined surface, and the barb is used to make the movable latch slide along the inclined surface of the latch seat when the pot lid is closed onto the base and to make the movable latch snap - lock onto the barb of the latch seat when the pot lid is fully closed onto the base. In this way, through the inclined surface of the barb, the movable latch can slide and rotate easily, which not only reduces the resistance of the snap - fit between the pot lid and the base but also facilitates the snap - lock of the movable latch and the barb.

[0015] In order to enable the movable latch to snap - lock onto the barb, a further technical solution may be that the pot lid is also provided with a movable latch spring, and the movable latch spring is used to push the movable latch to reset and rotate when the pot lid is fully closed onto the base so as to realize the snap - lock of the movable latch onto the latch seat. In this way, under the action of the movable latch spring, the movable latch slides and rotates outward along the inclined surface of the barb and then can reset and rotate to snap - lock onto the barb, and can press the movable latch to snap - lock well onto the latch seat.

[0016] Since the present invention has the above characteristics and advantages, it can be applied to cooking appliances with a multi - stage safety locking mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic top - view structure diagram of the pot lid of a cooking appliance with a multi - stage safety locking mechanism, showing the internal structure of the pot lid;

[0018] Figure 2 is a schematic top - view structure diagram of a cooking appliance with a multi - stage safety locking mechanism;

[0019] Figure 3 is Figure 2 a schematic cross - sectional structure diagram in the A - A direction of

[0020] Figure 4 is Figure 3 a schematic enlarged partial - structure diagram at M in

[0021] Figure 5 is Figure 2 a schematic cross - sectional structure diagram in the B - B direction of DETAILED DESCRIPTION OF THE INVENTION

[0022] The following further describes a cooking appliance with a multi - stage safety locking mechanism applying the technical solution of the present invention in conjunction with the drawings.

[0023] As Figure 3 shown, the cooking appliance with a multiple safety locking mechanism proposed by the present invention includes a base 9, and the base 9 includes an inner pot 91 disposed within the base 9, a base housing 92 disposed outside the inner pot 91, and a base bracket 93 disposed on the housing 92 for supporting the housing 92. The inner pot 91 has a rigid pot rim 911 protruding outward. Above the base 9, there is a pot lid 1 that can be closed on the inner pot 91. The tail of the pot lid 1 is hinged to the base 9 through the rotating shaft 13 and can open and close. The pot lid 1 includes a lid body 11 and a rigid member 12 disposed below the lid body 11. The inner pot 91 is used to hold food. When the pot lid 1 is closed on the base 9, the inner pot 91 and the rigid member 12 together form a cooking content cavity 100. A heating device 14 is also disposed within the base 9, and the heating device 14 is used to heat the inner pot 91 so as to heat and cook the food within the inner pot 91. As Figure 1 shown in Figure 3 Figure, a movable latch 41 is disposed at the front of the pot lid 1. Seen from the cross-section, the movable latch 41 is in the shape of a "Γ". The movable latch 41 includes a vertical arm 411 extending downward from the pot lid 1, a horizontal arm 413 connected to the upper end of the vertical arm 411 and extending horizontally into the pot lid 1, and a movable latch rotating shaft 414. There is a movable space between the horizontal arm 413 and the lid body 11 for the movable latch 41 to rotate. At the lower end of the vertical arm 411, there is a movable latch arm 412 disposed perpendicular to the vertical arm 411 and extending in the direction of the interior of the pot lid 1. A latch seat 931 cooperating with the movable latch 41 is disposed on the base bracket 93. A barb 9311 is disposed on the latch seat 931, and the barb 9311 has an inclined surface 9312. When the pot lid 1 is closed on the base 9, the movable latch arm 412 slides along the inclined surface 9312 of the latch seat, and the latch seat 931 pushes the movable latch 41 to rotate around the movable latch rotating shaft 414. A movable latch spring 43 is also disposed on the pot lid 1. The movable latch spring 43 is disposed between the movable latch 41 and the lid body 11. The movable latch spring 43 is used to push the movable latch 41 to reset and rotate when the pot lid 1 is completely closed on the base 9, so as to lock the movable latch 41 on the latch seat 931, thereby forming a first-stage lock by latching the pot lid 1 and the base 9 together.

[0024] The pot cover 1 is also provided with a cover opening button 42 which is transmission-connected with the movable lock 41, and the cover opening button 42 is movably arranged on the pot cover 1, and the cover opening button 42 includes a button cover 421 which is partially exposed outside the pot cover 1 and a button push rod 422 which is connected with the button cover 421 and extends toward the movable lock. When the cover opening button 42 is pressed, the button push rod 422 pushes the cross arm 413 of the movable lock to overcome the resistance of the movable lock spring 43 and drive the cross arm 413 of the movable lock to rotate downward, and the movable lock arm 412 rotates with the cross arm 413 of the movable lock to disengage from the lock seat 931, and the first locking is released.

[0025] like Figure 1 As shown, the pot cover 1 is provided with an inner pot locking mechanism, and the inner pot locking mechanism comprises a bracket (21, 21a), a hardware locking claw (22, 22a) and a driving member 23. In this embodiment, a pair of the brackets (21, 21a) are arranged on the cover body 11 in a left-right manner, and the brackets (21, 21a) are also arranged on the left-right manner and can move on the cover body 11. The hardware locking claws (22, 22a) are respectively installed on the brackets (21, 21a) and can move with the brackets (21, 21a). The driving member 23 can drive the brackets (21, 21a) and the hardware locking claws to move. The locking claws (22, 22a) move toward the center direction of the cover body 11 so that the rigid part 12 and the steel pot edge 911 of the inner pot can be locked by the hardware locking claws (22, 22a) to form a second locking; the pot cover 1 is also provided with a stop block (35, 35a), and the stop block (35, 35a) can move synchronously with the bracket (21, 21a). When the inner pot locking mechanism forms the second locking, the stop block (35, 35a) moves to a position that can prevent the active lock buckle 41 from rotating, thereby locking the active lock buckle 41. Figure 4As shown, the stop blocks (35, 35a) move to the space below the cross arm 413 of the movable latch 41, and the stop blocks (35, 35a) can hinder the rotation of the movable latch 41. When the inner pot locking mechanism releases the second-stage locking, the stop blocks (35, 35a) leave the movable latch 41 to release the locking of the movable latch 41, so that the movable latch 41 can rotate. In this embodiment, the stop blocks (35, 35a) move away from the space below the cross arm 413 of the movable latch 41, and the movable latch 41 can rotate. In this way, through the synchronous movement of the stop blocks (35, 35a) and the brackets (21, 21a), it can be effectively ensured that the first-stage locking cannot be released after the second-stage locking is formed. When opening the lid, only by releasing the second-stage locking first can the first-stage locking be released, which can well ensure that the lid 1 cannot be opened when the cooking appliance is performing high-temperature and high-pressure cooking, and avoid splashing injuries caused by the lid lifting the inner pot when the lid is opened, thereby greatly improving the use safety of the cooking appliance.

[0026] As Figure 1As shown, an intermediate connecting arm (30, 30a) is further provided on the pot lid 1. A pair of the intermediate connecting arms (30, 30a) are arranged left and right on the lid body 11. The intermediate connecting arms (30, 30a) are swingably arranged between the driving member 23 and the brackets (21, 21a). The intermediate connecting arms (30, 30a) include a driving connection end (32, 32a) in transmission connection with the driving member 23, a bracket connection end (31, 31a) in transmission connection with the brackets (21, 21a), a stop end (33, 33a) provided with the stop block (35, 35a), and a rotating shaft end (34, 34a). The driving member 23 can drive the intermediate connecting arms (30, 30a) to swing around the rotating shaft end (34, 34a) through the driving connection end (32, 32a). The stop block (35, 35a) can swing synchronously with the stop end (33, 33a). When the intermediate connecting arms (30, 30a) swing forward, the bracket connection ends (31, 31a) of the intermediate connecting arms drive the brackets (21, 21a) to move towards the center direction of the lid body 11 so as to achieve the second-stage locking. The stop block (35, 35a) can move with the stop end (33, 33a) of the intermediate connecting arms to a position where it can prevent the movable latch 41 from rotating, thereby achieving the locking of the movable latch 41. When the intermediate connecting arms (30, 30a) swing backward, the bracket connection ends (31, 31a) of the intermediate connecting arms can drive the brackets (21, 21a) to move towards the outer edge direction of the lid body 11 so as to release the second-stage locking. The stop block (35, 35a) can leave the movable latch 41 with the stop end (33, 33a) of the intermediate connecting arms to release the locking of the movable latch 41, so that the movable latch 41 can rotate. In this way, the synchronous movement of the brackets (21, 21a) and the stop block (35, 35a) is well achieved through the intermediate connecting arms (30, 30a), and it is well ensured that the pot lid 1 cannot be opened by driving the movable latch to rotate when the cooking appliance is performing high-temperature and high-pressure cooking, ensuring the use safety of the cooking appliance.

[0027] To facilitate the control of the pressure in the cooking cavity 100, as Figure 3As shown, an exhaust valve 7 is further provided on the pot lid 1. The exhaust valve 7 includes a valve seat 72 provided with an exhaust passage 721 and a weight 71 disposed on the valve seat 72. The exhaust passage 721 communicates with the cooking cavity 100 and the outside space of the pot. The exhaust passage 72 is provided with an air outlet 722. The weight 71 is used to block and press the air outlet 722 of the exhaust passage to close the exhaust passage 721. When the exhaust passage 721 is closed, the heating device 14 heats the food in the inner pot 91, and the temperature and air pressure in the cooking cavity 100 increase accordingly. The pot lid 1 further includes a movably provided exhaust rod 52. The exhaust rod 52 is used to push the weight 71 away from the air outlet 722 of the exhaust passage to open the exhaust passage 72. When the exhaust passage 72 is opened, the high-temperature steam in the cooking cavity 100 is discharged to the outside space of the pot through the air outlet 722, thereby achieving the purpose of reducing the pressure in the cooking cavity 100.

[0028] When the pressure in the cooking cavity 100 is greater than the atmospheric pressure in the outside space of the pot, the rigid member 12 will bear a large pressure, and a large force is required for the inner pot locking mechanism to unlock the second-stage locking. To ensure that the inner pot locking mechanism can simply and effectively unlock the second-stage locking, as Figure 1 and Figure 3As shown, a further technical solution may also be that a driving slider 50 is further provided between the driving member 23 and the intermediate connecting arm (30, 30a). The driving slider 50 can move back and forth on the pot lid 1 under the drive of the driving member 23. A driving arm 51 and the exhaust rod 52 are provided on the driving slider 50. The driving arm 51 is in transmission connection with the intermediate connecting arm (30, 30a). When the driving slider 50 moves forward under the action of the driving member 23, the driving arm 51 follows the driving slider 50 to move forward and drives the intermediate connecting arm (30, 30a) to swing forward, and the intermediate connecting arm (30, 30a) drives the bracket (21, 21a) to move towards the center direction of the cover body 11 to achieve the second-stage locking. At the same time, the exhaust rod 52 follows the driving slider 50 to move forward and moves away from the weight 71, and the weight 71 plugs the air outlet 722 of the exhaust passage under its own action to close the exhaust passage 721. When the driving slider 50 moves backward under the action of the driving member 23, the exhaust rod 52 follows the driving slider 50 to move backward and pushes the weight 71 away from the air outlet 722 of the exhaust passage to open the exhaust passage 721, and the high-temperature steam in the cooking cavity 100 is discharged from the exhaust passage 721 to reduce the pressure in the cooking cavity 100 until the pressure in the cooking cavity 100 is basically balanced with the pressure in the space outside the pot. A bracket spring 28 is further provided between the bracket (21, 21a) and the cover body 11. The bracket spring 28 is used to drive the bracket (21, 21a) to move towards the outer edge direction of the pot lid 1 to release the second-stage locking. At the same time, the bracket (21, 21a) drives the intermediate connecting arm (30, 30a) to swing in the reverse direction, and the stop block (35, 35a) can follow the stop end (33, 33a) of the intermediate connecting arm to leave the movable lock 41 to release the locking of the movable lock 41 so that the movable lock 41 can rotate. In this way, before releasing the second-stage locking, the driving member 23 is first used to drive the exhaust rod 52 to open the exhaust passage for exhausting. When the pressure in the cooking cavity 100 is basically balanced with the pressure in the space outside the pot, the bracket spring 28 is used to drive the bracket (21, 21a) to move towards the outer edge direction of the cover body 11 to release the second-stage locking,

[0029] Further, as Figure 3As shown, the pot cover is also provided with an exhaust rod sealing ring 73, which is arranged between the exhaust valve 7 and the exhaust rod 52, and is used to prevent the steam exhausted by the exhaust valve 7 from entering the pot cover 1 along the exhaust rod 52. In this way, through the obstruction of the exhaust rod sealing ring 73, the driving member 23 is well protected from being wetted by the steam exhausted by the exhaust valve 7, the probability of the driving member 23 malfunctioning is reduced, and the service life of the driving member 23 is extended.

[0030] The pot cover 1 is also provided with a locking mechanism that can respond to the air pressure or temperature in the inner pot 91. The locking mechanism includes a locking column 6. The intermediate connecting arm (30, 30a) or the bracket (21, 21a) is provided with a joint (36, 36a) that cooperates with the locking column 6. The locking column 6 is used to extend into the joint (36, 36a) when the air pressure or temperature in the inner pot 91 is higher than a threshold value, so that the intermediate connecting arm (30, 30a) or the bracket (21, 21a) cannot move, thereby realizing the self-locking of the pot cover 1. Among them, the arrangement of the joint (36, 36a) that cooperates with the locking column 6 is various. The first embodiment is as follows: Figure 1 As shown, the engaging portion (36, 36a) is arranged on the middle connecting arm (30, 30a), and when the locking column 6 extends into the engaging portion (36, 36a) arranged on the middle connecting arm (30, 30a), the locking column 6 can prevent the middle connecting arm (30, 30a) from moving, thereby preventing the bracket (21, 21a) from moving toward the outer edge of the cover body 1, and also allowing the stop block (35, 35a) arranged on the middle connecting arm (30, 30a) to remain in a position that hinders the rotation of the movable lock buckle 41, thereby preventing the movable lock buckle 41 from rotating, and the pot cover is self-locking. A second embodiment is that the engaging portion (36', 36a') (not shown in the figure) is arranged on the bracket (21, 21a), and when the locking column 6' (not shown in the figure) extends into the engaging portion (36', 36a') arranged on the bracket (21, 21a), the locking column 6' can prevent the bracket (21, 21a) from moving toward the outer edge of the cover body 1, and the intermediate connecting arm (30, 30a) is transmission-connected with the bracket (21, 21a), and the intermediate connecting arm (30, 30a) is restricted by the bracket (21, 21a) and cannot swing, which also keeps the stop block (35, 35a) arranged on the intermediate connecting arm (30, 30a) at a position that hinders the rotation of the movable lock buckle 41, thereby preventing the movable lock buckle 41 from rotating, and the pot cover 1 is self-locking.

Claims

1. A cooking appliance with a multiple safety locking mechanism, comprising a base, an inner pot disposed within the base, and a lid capable of covering the inner pot. The inner pot has a rigid pot rim protruding outward. The lid includes a lid body and a rigid member disposed below the lid body. The inner pot and the rigid member together form a cooking cavity. The tail of the lid is hinged to the base and can move in an opening and closing manner. An activatable latch is provided at the front of the lid, and a latch seat is provided on the base. The latch seat is configured to push the activatable latch to rotate when the lid covers the base and to allow the activatable latch to be latched and locked onto the latch seat when the lid is fully covered on the base, thereby achieving the latching of the lid and the base to form a first-level locking. It is characterized in that, The pot cover is provided with an inner pot locking mechanism, the inner pot locking mechanism comprises a bracket, a hardware locking claw and a driving member, the bracket is movably arranged on the cover body, the hardware locking claw is installed on the bracket and can move with the bracket, the driving member can drive the bracket and the hardware locking claw to move toward the center direction of the cover body, so that the rigid member and the rigid pot edge of the inner pot can be locked by the hardware locking claw to form a second locking; the pot cover is also provided with a stop block that can move synchronously with the bracket, when the inner pot locking mechanism forms the second locking, the stop block moves to a position that can hinder the rotation of the movable lock buckle to achieve the locking of the movable lock buckle, when the inner pot locking mechanism releases the second locking, the stop block leaves the movable lock buckle to release the locking of the movable lock buckle so that the movable lock buckle can rotate; The pot cover is also provided with a cover opening button which is transmission-connected with the movable lock, and the cover opening button is used to push the movable lock to overcome the resistance of the movable lock spring and drive the movable lock to rotate and disengage from the lock seat, thereby releasing the first locking; The pot cover is also provided with an intermediate connecting arm, which is swingably arranged between the driving member and the bracket. The intermediate connecting arm includes a driving connecting end that is transmission-connected to the driving member, a bracket connecting end that is transmission-connected to the bracket, a stop end that is provided with the stop block, and a rotating shaft end. The driving member can drive the intermediate connecting arm to swing around the rotating shaft end through the driving connecting end. When the intermediate connecting arm swings forward, the bracket connecting end of the intermediate connecting arm drives the bracket to move toward the center direction of the cover body to achieve the second locking. The stop block can follow the stop end of the intermediate connecting arm to move to a position that can hinder the rotation of the movable lock buckle to achieve the locking of the movable lock buckle; when the intermediate connecting arm swings reversely, the bracket connecting end of the intermediate connecting arm drives the bracket to move toward the outer edge direction of the cover body to release the second locking. The stop block can follow the stop end of the intermediate connecting arm to leave the movable lock buckle to release the locking of the movable lock buckle so that the movable lock buckle can rotate.

2. The cooking appliance with a multiple safety locking mechanism according to claim 1, wherein The pot cover is also provided with an exhaust valve, which includes a valve seat provided with an exhaust channel and a weight provided on the valve seat, the exhaust channel is connected to the cooking content cavity and the space outside the pot, the weight is used to block the air outlet of the exhaust channel to close the exhaust channel; the pot cover also includes a movably arranged exhaust rod, the exhaust rod is used to push the weight to leave the air outlet of the exhaust channel to open the exhaust channel.

3. The cooking appliance with a multiple safety locking mechanism according to claim 2, wherein, The lid is further provided with a locking mechanism capable of responding to the air pressure or temperature inside the inner pot. The locking mechanism includes a locking post, and a joint portion cooperating with the locking post is provided on the middle connecting arm or the bracket. The locking post is configured to extend into the joint portion when the air pressure or temperature inside the inner pot is higher than a threshold value, so that the middle connecting arm or the bracket cannot move, thereby realizing self-locking of the lid.

4. The cooking appliance with a multiple safety locking mechanism according to claim 2 or 3, characterized in that, A driving slider is further provided between the driving member and the middle connecting arm. The driving slider can move back and forth on the lid under the drive of the driving member. A driving arm and the exhaust rod are provided on the driving slider. The driving arm is in transmission connection with the middle connecting arm. When the driving slider moves forward under the action of the driving member, the driving arm follows the driving slider to move forward and drives the middle connecting arm to swing forward, and the middle connecting arm drives the bracket to move towards the center of the lid body to realize secondary locking. At the same time, the exhaust rod follows the driving slider to move forward and away from the weight, and the weight plugs the air outlet of the exhaust passage under its own action; when the driving slider moves backward under the action of the driving member, the exhaust rod follows the driving slider to move backward and pushes the weight away from the air outlet of the exhaust passage; a bracket spring is further provided between the bracket and the lid body. The bracket spring is configured to drive the bracket to move towards the outer edge of the lid to release the secondary locking when the driving member drives the driving slider to move backward and the pressure in the cooking cavity is substantially balanced with the pressure in the space outside the pot. At the same time, the bracket drives the middle connecting arm to swing in the reverse direction, and the stop block can follow the stop end of the middle connecting arm to leave the movable lock to release the locking of the movable lock, so that the movable lock can rotate.

5. The cooking appliance with a multiple safety locking mechanism according to claim 4, characterized in that, An exhaust rod sealing ring is further provided on the lid. The exhaust rod sealing ring is arranged between the exhaust valve and the exhaust rod. The exhaust rod sealing ring is used to prevent the steam discharged by the exhaust valve from entering the lid along the exhaust rod.

6. The cooking appliance with a multiple safety locking mechanism according to claim 5, characterized in that, The latch seat is provided with a barb. The barb has an inclined surface. The barb is used to allow the movable lock to slide along the inclined surface of the latch seat when the lid is closed on the base, and to lock the movable lock on the barb of the latch seat when the lid is completely closed on the base.

7. The cooking appliance with a multiple safety locking mechanism according to claim 6, characterized in that, An active lock spring is further provided on the lid. The active lock spring is used to push the active lock to reset and rotate when the lid is completely closed on the base, so as to realize the locking of the active lock on the latch seat.

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