Pot lid and cooking appliance

Abstract

The application provides a pot cover and a cooking appliance, wherein the pot cover comprises: a cover body; an exhaust pipe base arranged on the cover body, the exhaust pipe base being provided with an exhaust passage; an exhaust pipe provided with a pressure limiting passage and a pressure relief passage arranged at intervals; a pressure limiting valve arranged at an exhaust port of the pressure limiting passage; wherein the exhaust pipe is movable relative to the exhaust pipe base, the exhaust pipe has a pressure limiting position and a pressure relief position, when the exhaust pipe is located at the pressure limiting position, the pressure limiting passage is in communication with the exhaust passage, and the pressure relief passage is not in communication with the exhaust passage, when the exhaust pipe is located at the pressure relief position, the pressure relief passage is in communication with the exhaust passage; and a driving device in driving connection with the exhaust pipe. The technical scheme of the application effectively solves the problem of unsmooth pressure relief of the pressure cooking appliance in the related art when the electric rice cooker mode is used.

Description

Technical Field

[0001] This invention relates to the field of small household appliances, and more specifically, to a pot lid and a cooking utensil. Background Technology

[0002] Electric pressure cookers and rice cookers are two very common small household appliances. In order to fully meet their cooking needs, some families have purchased both electric pressure cookers and rice cookers, which has resulted in them taking up a lot of space in the kitchen.

[0003] In related technologies, to solve the above problems, an exhaust assembly is designed for electric pressure cookers, including an exhaust pipe and an exhaust pipe seat. The exhaust pipe has a through hole communicating with the outside atmosphere. The exhaust pipe is fitted onto the exhaust pipe seat, which has a protrusion, and the exhaust pipe has a groove. The exhaust pipe and the exhaust pipe seat are engaged through the protrusion and groove, so when the exhaust pipe seat rotates, the exhaust pipe also rotates synchronously. The exhaust pipe seat is fixed to the inner lid, and the exhaust pipe has external threads, which are threaded onto the liner through a fixing nut. When the rice cooker needs to be used, turning the handle rotates the inner lid, which in turn rotates the exhaust pipe seat, which in turn rotates the exhaust pipe. Because the exhaust pipe is threaded to the fixing nut, the threads guide the exhaust pipe, causing it to rise. Therefore, a flow gap is formed between the exhaust pipe and the exhaust pipe seat, and the inside of the pot communicates with the outside atmosphere through the flow gap and the through hole. At this time, the electric pressure cooker can be used as a rice cooker.

[0004] While the above structure can integrate the functions of a rice cooker and an electric pressure cooker into the same cooking appliance, the drawback of this method is that, due to the limited rotation angle of the inner lid, the angle at which the exhaust pipe seat drives the exhaust pipe to rotate is very small. This results in the exhaust pipe rising too low, forming a very small flow gap, which is not conducive to pressure relief and cannot achieve the pressureless cooking effect of the rice cooker. Summary of the Invention

[0005] The main objective of this invention is to provide a pot lid and a cooking appliance to solve the problem of unsmooth pressure release in pressure cooking appliances when using the rice cooker mode.

[0006] To achieve the above objectives, according to one aspect of the present invention, a pot lid is provided, comprising: a lid body; an exhaust pipe seat disposed on the lid body, the exhaust pipe seat having an exhaust channel and an exhaust pipe having pressure-limiting channels and pressure-relieving channels arranged at intervals; a pressure-limiting valve disposed at the exhaust port of the pressure-limiting channel, wherein the exhaust pipe is movable relative to the exhaust pipe seat, the exhaust pipe having a pressure-limiting position and a pressure-relieving position, when the exhaust pipe is in the pressure-limiting position, the pressure-limiting channel is connected to the exhaust channel, and the pressure-relieving channel is not connected to the exhaust channel; when the exhaust pipe is in the pressure-relieving position, the pressure-relieving channel is connected to the exhaust channel; and a driving device drivenly connected to the exhaust pipe.

[0007] According to the technical solution of this invention, the pot lid includes a driving device, which is driven and connected to the exhaust pipe. When the electric pressure cooker mode is required, the driving device drives the exhaust pipe to the pressure-limiting position. At this time, the exhaust channel inside the exhaust pipe seat is connected to the pressure-limiting channel inside the exhaust pipe. When the gas pressure inside the pot is greater than a preset value, the gas is discharged to the outside atmosphere through the pressure-limiting channel, achieving pressurized cooking. When the rice cooker mode is required, the driving device can drive the exhaust pipe to the pressure-relief position. At this time, the exhaust channel inside the exhaust pipe seat is connected to the pressure-relief channel inside the exhaust pipe, and the gas inside the pot can be directly discharged to the outside atmosphere through the pressure-relief channel, achieving pressureless cooking. The above structure drives the exhaust pipe to move through the driving device, so that the process of moving the exhaust pipe to the pressure-relief position is not limited by the rotation angle of the inner lid mentioned in the background art. This allows the exhaust pipe to move a greater distance relative to the exhaust pipe seat, thereby increasing the flow area of ​​the flow gap, which is beneficial for the discharge (pressure relief) of the gas inside the pot, thus improving the effect of pressureless cooking.

[0008] Furthermore, a guide structure is provided on the exhaust pipe and the exhaust pipe seat. The drive device drives the exhaust pipe to rotate relative to the exhaust pipe seat, and the exhaust pipe moves up and down relative to the exhaust pipe seat under the guidance of the guide structure. The above structure makes the structure more compact, which is conducive to the miniaturization design of the pot lid.

[0009] Furthermore, the pot lid also includes a transmission structure, through which the drive device is connected to the exhaust pipe. In the above structure, the transmission structure connects the drive device and the exhaust pipe, which on the one hand allows for increased output speed as needed, thereby increasing the maximum upward displacement of the exhaust pipe and facilitating pressure relief; on the other hand, it allows for flexible placement of the drive device and exhaust pipe, enabling them to be arranged according to available space and facilitating miniaturization.

[0010] Furthermore, the transmission structure includes a first transmission gear and a second transmission gear that mesh with each other. The first transmission gear is mounted on the drive unit, and the second transmission gear is mounted on the exhaust pipe. The radius of the first transmission gear is larger than the radius of the second transmission gear. This structure increases the maximum upward displacement of the exhaust pipe relative to the exhaust pipe seat, thereby facilitating pressure relief. Simultaneously, gear transmission offers the advantage of stable transmission, ensuring a smooth operation and improving the user experience.

[0011] Furthermore, the guide structure is a threaded structure, and the exhaust pipe and exhaust pipe seat are connected by a threaded connection. In the above structure, when the drive device drives the exhaust pipe to rotate, the threaded teeth guide its up-and-down movement relative to the exhaust pipe seat. The threaded structure is easy to manufacture, and the threaded connection ensures that the exhaust pipe will not shift or wobble during its up-and-down movement, providing a stable connection.

[0012] Furthermore, the cover body includes a liner and an inner cover rotatably disposed below the liner. The exhaust pipe seat is fixed to the inner cover by a nut, and the thread direction of the guide structure is opposite to that of the nut. The above structure designs the thread direction of the nut to be opposite to that of the thread structure, so that the exhaust pipe seat tends to tighten with the nut, which can effectively prevent loosening between the nut and the exhaust pipe seat.

[0013] Furthermore, the driving device is a drive motor, or the pot lid also includes an opening handle, which forms the driving device. The above structure utilizes the existing opening handle as the driving device, eliminating the need for additional driving devices and thus reducing production costs.

[0014] Furthermore, the lid body includes a liner and an inner lid rotatably disposed below the liner. The lid also includes an opening handle, which is rotatably disposed on the liner and connected to the inner lid. An exhaust pipe seat is fixed to the inner lid. The liner has a clearance hole corresponding to the exhaust pipe seat, and the exhaust pipe passes through the clearance hole. The opening handle is drivenly connected to the portion of the exhaust pipe that extends through the clearance hole. In the above structure, the exhaust pipe passing through the clearance hole facilitates the engagement of the first transmission tooth on the opening handle with the second transmission tooth on the exhaust pipe.

[0015] Furthermore, a flow gap exists between the exhaust channel and the pressure relief channel. The cover body also includes a sealing structure disposed at the flow gap. When the exhaust pipe is in the pressure-limiting position, the sealing structure blocks the flow gap. When the exhaust pipe is in the pressure relief position, the height of the flow gap is greater than the thickness of the sealing structure. This sealing structure ensures that the flow gap is effectively blocked when the exhaust pipe is in the pressure-limiting position, preventing gas from escaping from the pressure relief channel when pressure is applied inside the pot.

[0016] Furthermore, the exhaust pipe includes a lower pipe section, an upper pipe section with an inner diameter smaller than that of the lower pipe section, and a connecting wall connecting the upper pipe section and the lower pipe section. The upper pipe section is provided with a first through hole, and the connecting wall is provided with a second through hole located circumferentially outside the first through hole. The first through hole forms a pressure limiting channel, and the second through hole forms a pressure relief channel. Part of the exhaust pipe seat extends into the lower pipe section, and a flow gap is formed between the top surface of the exhaust pipe seat and the bottom surface of the connecting wall. The sealing structure is a sealing ring provided at the top of the exhaust pipe.

[0017] According to another aspect of the present invention, a cooking appliance is provided, comprising: an appliance body; and a lid disposed on the appliance body, wherein the lid is the aforementioned lid. Since the lid has the advantage of quickly releasing pressure when switching to rice cooker mode, the cooking appliance using the aforementioned lid also possesses the aforementioned advantages. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 An exploded view of a portion of the structure of an embodiment of the pot lid according to the present invention is shown;

[0020] Figure 2 It shows Figure 1 A three-dimensional structural diagram of the vent pipe of the pot lid when it is in the pressure-limiting position;

[0021] Figure 3 It shows Figure 2 A schematic diagram of the longitudinal section of the pot lid;

[0022] Figure 4 It shows Figure 3 A magnified view of part A on the pot lid;

[0023] Figure 5 It shows Figure 1 A three-dimensional structural diagram of the vent pipe of the pot lid when it is in the pressure relief position;

[0024] Figure 6 It shows Figure 5 A longitudinal section diagram of the pot lid; and

[0025] Figure 7 It shows Figure 6 A magnified view of part B of the pot lid.

[0026] The above figures include the following reference numerals:

[0027] 10. Cover body; 11. Liner; 111. Clearance hole; 12. Inner cover; 20. Exhaust pipe seat; 21. Exhaust passage; 30. Exhaust pipe; 31. Pressure limiting passage; 32. Pressure relief passage; 33. Lower pipe section; 34. Upper pipe section; 35. Connecting wall; 40. Pressure limiting valve; 50. Drive device; 60. Guide structure; 70. Transmission structure; 71. First transmission gear; 72. Second transmission gear; 80. Nut; 91. Rotating seat; 92. Handle body; 100. Sealing structure; 1. Flow gap. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the pot lid of this embodiment includes: a lid body 10, an exhaust pipe seat 20, an exhaust pipe 30, a pressure limiting valve 40, and a driving device 50. The exhaust pipe seat 20 is disposed on the lid body 10 and has an exhaust channel 21 inside. The exhaust pipe 30 has a pressure limiting channel 31 and a pressure relief channel 32 arranged at intervals. The pressure limiting valve 40 is disposed at the exhaust port of the pressure limiting channel 31. The exhaust pipe 30 is movable relative to the exhaust pipe seat 20 and has a pressure limiting position and a pressure relief position. When the exhaust pipe 30 is in the pressure limiting position, the pressure limiting channel 31 is connected to the exhaust channel 21, and the pressure relief channel 32 is not connected to the exhaust channel 21. When the exhaust pipe 30 is in the pressure relief position, the pressure relief channel 32 is connected to the exhaust channel 21. The driving device 50 is drivenly connected to the exhaust pipe 30.

[0030] Applying the technical solution of this embodiment, the pot lid includes a driving device 50, which is drivenly connected to the exhaust pipe 30. When the electric pressure cooker mode is required, the driving device 50 drives the exhaust pipe 30 to the pressure-limiting position. At this time, the exhaust channel 21 inside the exhaust pipe seat 20 is connected to the pressure-limiting channel 31 inside the exhaust pipe 30. When the gas pressure inside the pot is greater than a preset value, the gas is discharged to the outside atmosphere through the pressure-limiting channel 31. When the rice cooker mode is required, the driving device 50 can drive the exhaust pipe 30 to the pressure-relief position. At this time, the exhaust channel 21 inside the exhaust pipe seat 20 is connected to the pressure-relief channel 32 inside the exhaust pipe 30. The gas inside the pot can be directly discharged to the outside atmosphere through the pressure-relief channel, achieving pressureless cooking. The above structure drives the exhaust pipe 30 to move through the drive device 50, so that the process of moving the exhaust pipe 30 to the pressure relief position is not limited by the rotation angle of the inner cover mentioned in the background art. This allows the exhaust pipe 30 to move a greater distance relative to the exhaust pipe seat 20, thereby increasing the flow area of ​​the flow gap, which is conducive to the discharge (pressure relief) of gas in the pot, thus improving the effect of pressureless cooking.

[0031] like Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, a guide structure 60 is provided on the exhaust pipe 30 and the exhaust pipe seat 20. The driving device 50 drives the exhaust pipe 30 to rotate relative to the exhaust pipe seat 20, and the exhaust pipe 30 moves up and down relative to the exhaust pipe seat 20 under the guidance of the guide structure 60. In the above structure, the guide structure 60 can convert the tangential force on the exhaust pipe 30 into a force in the vertical direction, so that the exhaust pipe 30 can move relative to the exhaust pipe seat 20. The above structure makes the structure more compact, which is beneficial to the miniaturization design of the pot lid. Of course, in other embodiments not shown in the figure, the driving structure can also directly provide an upward pushing force to the exhaust pipe, so that the exhaust pipe can move relative to the exhaust pipe seat.

[0032] like Figures 1 to 5As shown, in this embodiment, the pot lid further includes a transmission structure 70, through which the drive device 50 is driven and connected to the exhaust pipe 30. In the above structure, the transmission structure 70 connects the drive device 50 and the exhaust pipe 30. On the one hand, this allows for increased output speed according to actual needs, thereby increasing the maximum upward displacement of the exhaust pipe, which facilitates pressure relief; on the other hand, it makes the placement of the drive device 50 and the exhaust pipe 30 flexible, allowing for arrangement according to actual space, which is beneficial for miniaturization design.

[0033] like Figures 2 to 6 As shown, in this embodiment, the transmission structure 70 includes a first transmission tooth 71 and a second transmission tooth 72 that mesh with each other. The first transmission tooth 71 is disposed on the driving device 50, and the second transmission tooth 72 is disposed on the exhaust pipe 30. The radius of the first transmission tooth 71 is larger than the radius of the second transmission tooth 72. In the above structure, the transmission structure 70 consists of a first transmission tooth 71 and a second transmission tooth 72 that mesh with each other. The first transmission tooth 71 is driven by the driving device 50, and the second transmission tooth 72 rotates synchronously with the exhaust pipe 30. Since the radius of the first transmission tooth is larger than that of the second transmission tooth, specifically, if the driving device 50 drives the first transmission tooth to rotate by an angle α, then the rotation angle β of the second transmission tooth meshing with the first transmission tooth will be greater than α. This increases the rotation angle of the exhaust pipe 30, thereby increasing the maximum upward displacement of the exhaust pipe 30 relative to the exhaust pipe seat 20, which is beneficial for pressure relief. Preferably, the radius of the first transmission tooth is four times the radius of the second transmission tooth, that is, when the first transmission tooth rotates 90°, the second transmission tooth rotates 360°. Of course, in embodiments not shown in the figure, the transmission structure may also be a first pulley, a second pulley, and a belt fitted on the first pulley and the second pulley.

[0034] like Figure 4 and Figure 7 As shown, in this embodiment, the guide structure 60 is a threaded structure, and the exhaust pipe 30 and the exhaust pipe seat 20 are connected by a threaded structure. In the above structure, when the driving device 50 drives the exhaust pipe 30 to rotate, the threaded teeth guide it to move up and down relative to the exhaust pipe seat 20. The threaded connection is stable and easy to process.

[0035] like Figure 3 and Figure 6As shown, in this embodiment, the cover body 10 includes a liner 11 and an inner cover 12 rotatably disposed below the liner 11. The exhaust pipe seat 20 is fixed to the inner cover 12 by a nut 80. The thread direction of the guide structure 60 is opposite to that of the nut 80. Since the exhaust pipe 30 and the exhaust pipe seat 20 are connected by a threaded structure, when the drive device 50 drives the exhaust pipe 30 to rotate, the exhaust pipe seat 20 and the exhaust pipe 30 have the same rotational tendency. If the thread direction of the nut 80 is the same as that of the guide structure, the exhaust pipe seat will also have a rotational tendency to separate from the nut 80. After long-term use, the exhaust pipe seat 20 and the nut 80 are prone to loosening. The above structure designs the thread direction of the nut 80 to be opposite to that of the guide structure, so that the exhaust pipe seat 20 has a tendency to tighten with the nut 80, which can effectively prevent the nut 80 and the exhaust pipe seat 20 from loosening.

[0036] Additionally, it should be noted that, as Figure 3 As shown, the nut 80 has vent holes, with more than four vent holes, preferably six, and the diameter of the vent holes is 2-3 mm. This ensures that when the exhaust pipe 30 is in the depressurization position, the gas inside the pot can enter the exhaust channel through the vent holes, allowing for smooth depressurization inside the pot.

[0037] like Figure 1 Figure 2 and Figure 5 As shown, in this embodiment, the pot lid further includes an opening handle, which forms a driving device 50. This structure utilizes the existing opening handle as the driving device 50, eliminating the need for additional driving devices and thus reducing production costs. Of course, in other embodiments not shown in the figure, the driving device can be a drive motor. In the above structure, the drive motor can drive the exhaust pipe to rotate, thereby freeing the exhaust pipe from the restriction of the inner lid's rotation. Furthermore, this structure eliminates the need for manual adjustment to switch modes, optimizing the user experience.

[0038] It should be noted that in this embodiment, the cover opening handle includes a rotating base 91 rotatably mounted on the cover 11 and a handle body 92 fixed on the rotating base. The rotating base 91 and the first transmission gear 71 are integrally formed, and the exhaust pipe 30 and the second transmission gear 72 are integrally formed. In the above structure, rotating the cover opening handle drives the first transmission gear 71 to rotate, and the first transmission gear 71 drives the second transmission gear 72 with a smaller radius to rotate, so that the cover opening handle can be rotated by a very small angle, while the exhaust pipe 30 can obtain a large movement space. The above structure makes the most of the original structure and reduces production costs.

[0039] like Figures 1 to 6As shown, in this embodiment, the lid body 10 includes a liner 11 and an inner lid 12 rotatably disposed below the liner 11. The lid also includes an opening handle, which is rotatably disposed on the liner 11 and connected to the inner lid 12. An exhaust pipe seat 20 is fixed to the inner lid 12. The liner 11 is provided with a clearance hole 111 corresponding to the exhaust pipe seat 20. An exhaust pipe 30 passes through the clearance hole 111, and the opening handle is driven to connect with the portion of the exhaust pipe 30 that passes through the clearance hole 111. In the above structure, the exhaust pipe 30 passes through the clearance hole 111, which facilitates the engagement of the first transmission tooth 71 on the opening handle with the second transmission tooth 72 on the exhaust pipe 30.

[0040] like Figure 4 and Figure 7 As shown, in this embodiment, there is a flow gap 1 between the exhaust channel 21 and the pressure relief channel 32. The cover body 10 also includes a sealing structure 100 disposed at the flow gap 1. When the exhaust pipe 30 is in the pressure-limiting position, the sealing structure 100 blocks the flow gap 1. When the exhaust pipe 30 is in the pressure relief position, the height of the flow gap 1 is greater than the thickness of the sealing structure 100. In the above structure, when the exhaust pipe 30 is in the pressure-limiting position, the exhaust pipe 30 presses down to press the sealing structure 100. At this time, the flow gap 1 between the exhaust channel 21 in the exhaust pipe seat 20 and the pressure relief channel 32 in the exhaust pipe 30 is blocked by the sealing structure 100, so that gas can only enter the pressure-limiting channel 31. The top of the pressure-limiting channel has a pressure-limiting valve 40 to ensure normal pressure build-up inside the pot. The sealing structure 100 ensures that when the exhaust pipe 30 is in the pressure-limiting position, the flow gap 1 can be effectively blocked, ensuring that gas will not escape from the pressure relief channel 32 when the pressure inside the pot is increased.

[0041] like Figure 4 and Figure 7 As shown, in this embodiment, the exhaust pipe 30 includes a lower pipe section 33, an upper pipe section 34 with an inner diameter smaller than that of the lower pipe section 33, and a connecting wall 35 connecting the upper pipe section 34 and the lower pipe section 33. The upper pipe section 34 has a first through hole, and the connecting wall 35 has a second through hole located circumferentially outside the first through hole. The first through hole forms a pressure-limiting channel 31, and the second through hole forms a pressure-relieving channel 32. A portion of the exhaust pipe seat 20 extends into the lower pipe section 33, and a flow gap 1 is formed between the top surface of the exhaust pipe seat 20 and the bottom surface of the connecting wall 35. The sealing structure 100 is a sealing ring disposed at the top of the exhaust pipe. Specifically, when the exhaust pipe 30 is in the pressure-limiting position, the gas inside the pot enters the first through hole of the exhaust pipe 30 after passing through the exhaust pipe seat 20 and is blocked by the pressure-limiting valve, allowing normal pressure build-up inside the pot and achieving pressurized cooking. When the exhaust pipe 30 is in the pressure relief position, the gas inside the pot can be directly discharged to the outside atmosphere through the second through hole of the exhaust pipe 30 after passing through the exhaust pipe seat 20, thus achieving pressureless cooking.

[0042] This application also includes a cooking appliance, an embodiment of which (not shown in the figures) includes: an appliance body and a lid; the lid is disposed on the appliance body, and the lid is the aforementioned lid. Since the lid has the advantage of quickly releasing pressure when switching to rice cooker mode, the cooking appliance using the aforementioned lid also has the aforementioned advantages.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pot lid, characterized in that, include: Cover body (10); An exhaust pipe seat (20) is disposed on the cover body (10), and the exhaust pipe seat (20) has an exhaust channel (21). The exhaust pipe (30) has a pressure limiting channel (31) and a pressure relief channel (32) arranged at intervals, and there is a flow gap (1) between the exhaust channel (21) and the pressure relief channel (32). A pressure limiting valve (40) is provided at the exhaust port of the pressure limiting channel (31). The exhaust pipe (30) is movable relative to the exhaust pipe seat (20). The exhaust pipe (30) has a pressure limiting position and a pressure relief position. When the exhaust pipe (30) is in the pressure limiting position, the pressure limiting channel (31) is connected to the exhaust channel (21). The pressure relief channel (32) is not connected to the exhaust channel (21). When the exhaust pipe (30) is in the pressure relief position, the pressure relief channel (32) is connected to the exhaust channel (21). A drive unit (50) is driven to connect with the exhaust pipe (30); The transmission structure (70) is used to drive the drive device (50) to the exhaust pipe (30), thereby increasing the maximum upward displacement of the exhaust pipe (30) and thus increasing the area of ​​the flow gap (1). The cover body (10) also includes a sealing structure (100), which is disposed at the flow gap (1). When the exhaust pipe (30) is in the pressure limiting position, the sealing structure (100) blocks the flow gap (1). When the exhaust pipe (30) is in the pressure relief position, the height of the flow gap (1) is greater than the thickness of the sealing structure (100).

2. The pot lid according to claim 1, characterized in that, The exhaust pipe (30) and the exhaust pipe seat (20) are provided with a guide structure (60). The driving device (50) drives the exhaust pipe (30) to rotate relative to the exhaust pipe seat (20). Under the guidance of the guide structure (60), the exhaust pipe (30) moves up and down relative to the exhaust pipe seat (20).

3. The pot lid according to claim 1, characterized in that, The transmission structure (70) includes a first transmission tooth (71) and a second transmission tooth (72) that mesh with each other. The first transmission tooth (71) is disposed on the drive device (50), and the second transmission tooth (72) is disposed on the exhaust pipe (30). The radius of the first transmission tooth (71) is greater than the radius of the second transmission tooth (72).

4. The pot lid according to claim 2, characterized in that, The guide structure (60) is a threaded structure, and the exhaust pipe (30) and the exhaust pipe seat (20) are connected by the threaded structure.

5. The pot lid according to claim 4, characterized in that, The cover body (10) includes a liner (11) and an inner cover (12) rotatably disposed below the liner (11). The exhaust pipe seat (20) is fixed to the inner cover (12) by a nut (80). The thread direction of the guide structure (60) is opposite to that of the thread direction of the nut (80).

6. The pot lid according to claim 1, characterized in that, The driving device (50) is a drive motor, or the pot lid further includes: The cover handle forms the drive device (50).

7. The pot lid according to claim 6, characterized in that, The lid body (10) includes a liner (11) and an inner lid (12) rotatably connected and disposed below the liner (11). The lid also includes an opening handle, which is rotatably disposed on the liner (11) and connected to the inner lid (12). The exhaust pipe seat (20) is fixed on the inner lid (12). The liner (11) is provided with a clearance hole (111) corresponding to the exhaust pipe seat (20). The exhaust pipe (30) passes through the clearance hole (111). The opening handle is driven to be connected to the part of the exhaust pipe (30) that passes through the clearance hole (111).

8. The pot lid according to claim 1, characterized in that, The exhaust pipe (30) includes a lower pipe section (33), an upper pipe section (34) with an inner diameter smaller than that of the lower pipe section (33), and a connecting wall (35) connecting the upper pipe section (34) and the lower pipe section (33). The upper pipe section (34) is provided with a first through hole, and the connecting wall (35) is provided with a second through hole located circumferentially outside the first through hole. The first through hole forms the pressure limiting channel (31), and the second through hole forms the pressure relief channel (32). Part of the exhaust pipe seat (20) extends into the lower pipe section (33). The top surface of the exhaust pipe seat (20) and the bottom surface of the connecting wall (35) form the flow gap (1). The sealing structure (100) is a sealing ring provided on the top of the exhaust pipe (30).

9. A cooking utensil, comprising: The body of the appliance; A pot lid, which is placed on the body of the utensil, is characterized in that the pot lid is the pot lid according to any one of claims 1 to 8.

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