A steam valve structure and a device having the same

Abstract

A steam valve structure and a device having the same provided by the present invention, wherein the steam valve structure comprises: a base assembly, on which a first exhaust passage adapted to communicate with a pot body is formed; an upper cover assembly, which is disposed on the base assembly in a liftable manner and has an initial position covering the base assembly and a raised position spaced from the base assembly. When the upper cover assembly is in the raised position, a gap between the upper cover assembly and the base assembly forms a second exhaust passage, and the second exhaust passage communicates with the first exhaust passage; a driving device for driving the upper cover assembly to perform a lifting motion. The outlet area of the second exhaust passage is adjustable. This steam valve structure can be applied to a rice cooker with a relatively large power and can adjust the outlet area according to different powers, thereby avoiding food overflow.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a steam valve structure and a device having the same. Background Art

[0002] Rice cookers usually have different functions such as cooking rice, porridge or soup, and different functions correspond to different powers. Since the outlet area of the steam valve structure of the current rice cooker is fixed and unchanged, the outlet area of the steam valve cannot be matched with the power. When using a function with a high power, due to the small outlet area of the steam valve, the air flow at the outlet is too fast, resulting in food overflow. To avoid food overflow, the power of the current rice cooker is not too high, and the food is heated slowly. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the steam valve structure of the rice cooker in the prior art is prone to food overflow, so as to provide a steam valve structure and a device having the same that can avoid food overflow.

[0004] To solve the above technical problem, a steam valve structure provided by the present invention includes:

[0005] A base assembly, on which a first exhaust passage adapted to communicate with the pot body is formed;

[0006] An upper cover assembly, which is arranged on the base assembly in a liftable manner, and has an initial position covering the base assembly and a raised position spaced from the base assembly. When the upper cover assembly is in the raised position, a gap between the upper cover assembly and the base assembly forms a second exhaust passage, and the second exhaust passage communicates with the first exhaust passage;

[0007] A driving device for driving the upper cover assembly to perform a lifting movement.

[0008] The driving device includes a power device and a transmission mechanism, and the transmission mechanism drives the upper cover assembly to perform a lifting movement under the drive of the power device.

[0009] The base assembly includes:

[0010] A base, on which the power device is provided;

[0011] A rotating member, which is rotatably arranged on the base and rotates under the drive of the power device.

[0012] The transmission mechanism includes:

[0013] A first motion conversion mechanism, which connects the power device and the rotating member and is adapted to drive the rotating member to rotate under the drive of the power device;

[0014] A second motion conversion mechanism for converting the rotation of the rotating member into the lifting motion of the upper cover assembly;

[0015] A limiting structure for restricting the circumferential movement of the upper cover assembly.

[0016] The first motion conversion mechanism includes:

[0017] A driving gear, connected to the power device and adapted to rotate under the drive of the power device;

[0018] Engaging teeth, provided on the rotating member and meshing with the driving gear.

[0019] The second motion conversion mechanism includes:

[0020] An inclined protrusion, provided on the outer peripheral wall of the rotating member;

[0021] An inclined groove, provided on the upper cover assembly and cooperating with the inclined protrusion.

[0022] The limiting structure includes:

[0023] A limiting post, provided on the upper cover assembly;

[0024] A limiting cavity, provided on the base assembly for restricting the rotation of the limiting post, and the limiting post is vertically movable in the limiting cavity.

[0025] The base assembly further includes an inner cover fixedly connected to the base. The inner cover includes a first annular body adapted to be supported on the base, and the limiting cavity is a limiting hole formed on the first annular body.

[0026] A sealing ring is provided in the limiting hole.

[0027] The inner cover further includes a second annular body extending downward from the lower end of the first annular body. A first through hole is provided on the base, and the second annular body is adapted to be embedded in the first through hole. A first exhaust passage is formed in the second annular body, and an installation cavity for installing the rotating member is formed between the outer peripheral wall of the second annular body and the base.

[0028] The upper cover assembly includes a support structure and an upper cover covering the support structure, and the limiting post is provided on the support structure.

[0029] The upper cover is detachably connected to the support structure.

[0030] The lower end of the upper cover is provided with an annular groove, and the support structure includes a third annular body, and the third annular body is adapted to be embedded in the annular groove.

[0031] The outer edge of the third annular body is provided with a snap button, and the upper cover is provided with a convex block that cooperates with the snap button.

[0032] The lower end of the upper cover extends downward with a first side plate.

[0033] The power device is a stepper motor.

[0034] The base is provided with a first limiting portion and a second limiting portion at intervals. A second side plate is provided on one side of the rotating member outside the meshing teeth. When the upper cover assembly is in the initial position, the second side plate contacts the first limiting portion. When the upper cover assembly is in the highest rising position, the side of the meshing teeth away from the second side plate abuts against the second limiting portion.

[0035] The base is provided with a first microswitch and a second microswitch that are linked with the driving motor at intervals. A second side plate is provided on one side of the rotating member outside the meshing teeth. When the upper cover assembly is in the initial position, the second side plate contacts the first microswitch. When the upper cover assembly is in the highest rising position, the side of the meshing teeth away from the second side plate contacts the second microswitch.

[0036] The present invention also provides a device with a steam valve structure, including the steam valve structure described above.

[0037] The device with the steam valve structure is an electric rice cooker.

[0038] The technical solution of the present invention has the following advantages:

[0039] 1. For the steam valve structure provided by the present invention, the driving device drives the upper cover assembly to perform a lifting motion, so that the distance between the upper cover assembly and the base assembly can be adjusted. The gap between the upper cover assembly and the base assembly forms a second exhaust passage. Therefore, the outlet area of the second exhaust passage can be adjusted. This steam valve structure can be applied to an electric rice cooker with a relatively large power, and can adjust the outlet area according to different powers, thus avoiding food overflow.

[0040] 2. For the steam valve structure provided by the present invention, the driving device includes a power device and a transmission mechanism. The transmission mechanism drives the upper cover assembly to perform a lifting motion under the drive of the power device. The steam valve structure is usually installed on the cooking lid of the electric rice cooker. With this setting, the power device can be arranged on the side of the exhaust passage, without affecting normal exhaust.

[0041] 3. The steam valve structure provided by the present invention, wherein the transmission mechanism includes: a first motion conversion mechanism, connecting the power device and the rotating member, and adapted to drive the rotating member to rotate under the drive of the power device; a second motion conversion mechanism, for converting the rotation of the rotating member into the lifting motion of the upper cover assembly; a limiting structure, for restricting the circumferential motion of the upper cover assembly, and neither the power device nor the transmission mechanism will affect the normal exhaust of the steam valve structure, and the exhaust process will not cause damage to the power device and the transmission mechanism.

[0042] 4. The steam valve structure provided by the present invention, wherein the second motion conversion mechanism includes: an inclined protrusion, provided on the outer peripheral wall of the rotating member; an inclined groove, provided on the upper cover assembly and cooperating with the inclined protrusion, and through the cooperation of the inclined protrusion and the inclined groove, the rotation of the rotating member is converted into the lifting movement of the upper cover assembly, and the structure is simple and compact.

[0043] 5. The steam valve structure provided by the present invention, wherein the limiting structure includes: a limiting post, provided on the upper cover assembly; a limiting cavity, provided on the base assembly, for restricting the rotation of the limiting post, and the limiting post is vertically movable in the limiting cavity. By adopting the limiting post, when the upper cover assembly is in the raised position, the gap between the upper cover assembly and the base assembly is the air outlet, and the area of the air outlet is relatively large.

[0044] 6. The steam valve structure provided by the present invention, wherein a sealing ring is provided in the limiting hole, which can prevent steam or foreign objects from entering the limiting cavity and ensure that the limiting post can move up and down in the limiting cavity.

[0045] 7. The steam valve structure provided by the present invention, wherein the inner cover further includes a second annular body extending downward from the lower end of the first annular body, a first through hole is provided on the base, and the second annular body is adapted to be embedded in the first through hole. The first exhaust passage is formed inside the second annular body, and an installation cavity for installing the rotating member is formed between the outer peripheral wall of the second annular body and the base. Such a setting can prevent steam from damaging the rotating member and ensure the normal operation of the rotating member.

[0046] 8. The steam valve structure provided by the present invention, wherein the upper cover assembly includes a support structure and an upper cover covering the support structure, the limiting post is provided on the support structure, and the upper cover can prevent foreign objects from entering the first exhaust passage.

[0047] 9. The steam valve structure provided by the present invention, wherein the upper cover is detachably connected to the support structure, which is convenient for disassembling the upper cover for cleaning.

[0048] 10. The steam valve structure provided by the present invention, a snap is provided on the outer edge of the third annular body, and a bump matching with the snap is provided on the upper cover. The upper cover and the support structure are connected by a rotary snap-fastening method, with stable connection and convenient disassembly.

[0049] 11. The steam valve structure provided by the present invention, a first side plate extends downward from the lower end of the upper cover. When the steam valve structure is in use, the first side plate can block the overflow of steam towards the direction where the display board is provided.

[0050] 12. The steam valve structure provided by the present invention, the power device is a stepper motor, which is convenient for precisely controlling the lifting height of the upper cover assembly to match the power of the rice cooker.

[0051] 13. The steam valve structure provided by the present invention, a first limiting portion and a second limiting portion are provided on the base at intervals. A second side plate is provided on the outer side of the rotating member at one side of the meshing teeth. When the upper cover assembly is in the initial position, the second side plate contacts the first limiting portion. When the upper cover assembly is in the highest rising position, the side of the meshing teeth away from the second side plate abuts against the second limiting portion, which can prevent the rotating member from rotating to a position where it disengages from the meshing with the driving gear and ensure normal operation.

[0052] 14. The steam valve structure provided by the present invention, a first microswitch and a second microswitch linked with the driving motor are provided on the base at intervals. A second side plate is provided on the outer side of the rotating member at one side of the meshing teeth. When the upper cover assembly is in the initial position, the second side plate contacts the first microswitch. When the upper cover assembly is in the highest rising position, the side of the meshing teeth away from the second side plate contacts the second microswitch, which can control the highest rising position of the upper cover assembly, prevent the rotating member from rotating to a position where it disengages from the meshing with the driving gear and ensure normal operation.

[0053] 15. The device with a steam valve structure provided by the present invention includes the steam valve structure described above. This device can adjust the size of the air outlet to match the power, and there will be no phenomenon of food overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0055] Figure 1 It is a schematic structural diagram of the steam valve structure provided in Embodiment 1 of the present invention;

[0056] Figure 2 The Figure 1 exploded view of the steam valve structure shown;

[0057] Figure 3 The Figure 2 structural schematic diagram of the upper cover shown;

[0058] Figure 4 The Figure 2 structural schematic diagram of the support structure shown;

[0059] Figure 5 The Figure 2 structural schematic diagram of the inner cover shown;

[0060] Figure 6 The Figure 2 structural schematic diagram of the rotating member shown;

[0061] Figure 7 The Figure 2 structural schematic diagram of the base shown;

[0062] Figure 8 The Figure 1 structural schematic diagram of the steam valve structure installed on the pot cover shown;

[0063] Explanation of reference numerals:

[0064] 1 - Base; 11 - Screw hole; 12 - First limiting part; 13 - Second limiting part; 14 - Installation groove; 2 - Rotating member; 21 - Meshing teeth; 22 - Inclined protruding part; 23 - Second side plate; 3 - Inner cover; 31 - Limiting hole; 32 - Screw post; 33 - First annular body; 34 - Second annular body; 4 - Support structure; 41 - Inclined groove; 42 - Limiting post; 43 - Third annular body; 44 - Buckle; 5 - Upper cover; 51 - First side plate; 52 - Annular groove; 53 - Protrusion; 6 - Power device; 7 - Driving gear; 8 - Sealing ring; 9 - Pot cover. Detailed implementation manners

[0065] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0066] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0068] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0069] Embodiment 1

[0070] This embodiment provides a specific implementation manner of a steam valve structure, as Figures 1 to 8 shown. The steam valve structure is suitable for being installed on a rice cooker or a pressure cooker, and includes a base assembly, an upper cover assembly, and a driving device.

[0071] A first exhaust passage adapted to communicate with the pot body is formed on the base assembly. The base assembly of this embodiment includes a base 1, a rotating member 2, and an inner cover 3.

[0072] The upper cover assembly is disposed on the base assembly in a liftable manner, and has an initial position covering the base assembly and a raised position spaced from the base assembly. When the upper cover assembly is in the raised position, a gap between the upper cover assembly and the base assembly forms a second exhaust passage, and the second exhaust passage communicates with the first exhaust passage. The upper cover assembly of this embodiment includes an upper cover 5 and a support structure 4.

[0073] The driving device is used to drive the upper cover assembly to perform a lifting motion.

[0074] As a preferred embodiment, the driving device includes a power device 6 and a transmission mechanism. The transmission mechanism drives the upper cover assembly to move up and down under the drive of the power device 6. In other alternative embodiments, the driving device only includes the power device 6, and the power device 6 is directly connected to the upper cover assembly to drive the upper cover assembly to move up and down. The power device 6 can adopt a cylinder, but in this embodiment, the power device 6 needs to occupy a part of the exhaust passage.

[0075] A power device 6 is provided on the base 1. The power device 6 in this embodiment is a stepper motor. As Figure 7 shown, an installation groove 14 is provided on the base 1, and the stepper motor is installed in the installation groove 14. In other alternative embodiments, an installation space for the power device 6 can be provided on the cooking pot lid 9 of the rice cooker.

[0076] The rotating member 2 is rotatably provided on the base 1 and rotates under the drive of the power device 6.

[0077] The transmission mechanism includes a first motion conversion mechanism, a second motion conversion mechanism and a limiting structure. The first motion conversion mechanism connects the power device 6 and the rotating member 2 and is adapted to drive the rotating member 2 to rotate under the drive of the power device 6; the second motion conversion mechanism is used to convert the rotation of the rotating member 2 into the up and down movement of the upper cover assembly; the limiting structure restricts the circumferential movement of the upper cover assembly.

[0078] Specifically, the first motion conversion mechanism includes a driving gear 7 connected to the power device 6 and a meshing tooth 21 provided on the rotating member 2. The driving gear 7 is adapted to rotate under the drive of the power device 6, and the meshing tooth 21 meshes with the driving gear 7. In other alternative embodiments, the first motion conversion mechanism may include a rack connected to the power device 6, and the rack meshes with the meshing tooth 21 on the rotating member 2.

[0079] The second motion conversion mechanism includes an inclined protrusion 22 provided on the outer peripheral wall of the rotating member 2 and an inclined groove 41 provided on the upper cover assembly. The inclined protrusion 22 is embedded in the inclined groove 41, and the two cooperate with each other.

[0080] The limiting structure includes a limiting column 42 provided on the upper cover assembly and a limiting cavity provided on the base assembly. The limiting cavity is used to restrict the rotation of the limiting column 42, and the limiting column 42 is vertically movably provided in the limiting cavity. The limiting cavity in this embodiment is a limiting hole 31 formed on the inner lid 3, and the limiting column 42 is vertically movably inserted into the limiting hole 31. By adopting the limiting column 42, when the upper cover assembly is in the raised position, the gap between the upper cover assembly and the base assembly is the air outlet. Assuming that the edge of the upper cover assembly is a circle and extends downward to form a cylinder, the cylinder is located between the upper cover assembly and the base assembly. Since the volume of the limiting column is very small, the area of the circumferential surface of the cylinder can be equivalent to the area of the air outlet, and the area of the air outlet is large.

[0081] The inner cover 3 is fixedly connected to the base 1. Specifically, screw posts 32 are provided on the inner cover 3, and screw holes 11 are provided on the base 1. The inner cover 3 and the base 1 are connected by screws. The inner cover 3 includes a first annular body 33 and a second annular body 34 extending downward from the lower end of the first annular body 33. The first annular body 33 is adapted to be supported on the base 1, and a limiting cavity is formed on the first annular body 33. A first through hole is provided on the base 1, and the second annular body 34 is adapted to be embedded in the first through hole. A first exhaust passage is formed inside the second annular body 34, and an installation cavity for installing the rotating member 2 is formed between the outer peripheral wall of the second annular body 34 and the base 1.

[0082] As a preferred embodiment, a sealing ring 8 is provided in the limiting hole 31. It can prevent steam or foreign objects from entering the limiting cavity and ensure that the limiting post 42 can move up and down in the limiting cavity.

[0083] The upper cover 5 is covered on the support structure 4, which can prevent foreign objects from entering the first exhaust passage.

[0084] For the convenience of disassembling the upper cover 5 for cleaning, the upper cover 5 and the support structure 4 are detachably connected.

[0085] Specifically, an annular groove 52 is provided at the lower end of the upper cover 5, and the support structure 4 includes a third annular body 43, and the third annular body 43 is adapted to be embedded in the annular groove 52.

[0086] A snap button 44 is provided at the outer edge of the third annular body 43, and a convex block 53 is provided on the upper cover 5 and is matched with the snap button 44. The snap button 44 includes a first groove and a second groove. The first groove runs through the entire outer edge of the third annular body 43, and the second groove is only provided in the lower half of the outer edge of the third annular body 43. The first groove and the second groove form an L shape. The convex block 53 is provided on the upper cover 5 and has a gap with the upper cover body, so that the convex block 53 can first be stuck into the first groove and then be stuck into the second groove by rotation. Of course, in other alternative embodiments, the snap button 44 can also be provided on the upper cover 5 and the convex block 53 can be provided on the support structure 4.

[0087] To prevent steam from overflowing towards the direction where the display board is located, a first side plate 51 extends downward from the lower end of the upper cover 5.

[0088] The power device 6 is a stepping motor, which is convenient for precisely controlling the lifting height of the upper cover assembly to match the power of the rice cooker.

[0089] In this embodiment, the base 1 is provided with a first limiting portion 12 and a second limiting portion 13 at intervals. A second side plate 23 is provided on the outer side of the rotating member 2 on the side of the meshing teeth 21. When the upper cover assembly is in the initial position, the second side plate 23 contacts the first limiting portion 12. When the upper cover assembly is in the highest rising position, the side of the meshing teeth 21 away from the second side plate 23 abuts against the second limiting portion 13.

[0090] The initial position of this steam valve structure is defined as the position where the upper cover assembly covers the base assembly. At this time, the second exhaust passage is closed, the second side plate 23 contacts the first limiting portion 12, and the inclined groove 41 is stuck at the lowest end of the inclined protrusion 22. When work is required, the rising height of the upper cover assembly is adjusted correspondingly according to the required power, and the power device 6 is controlled to start. The power device 6 drives the driving gear 7 to rotate. The driving gear 7 drives the rotating member 2 to rotate through meshing with the meshing teeth 21. The limiting column 42 rises along the inclined protrusion 22, thereby driving the upper cover assembly to move upward. When the required height is reached, the power device 6 stops working. When the required power is the largest, the upper cover assembly needs to rise to the highest position. Correspondingly, the meshing teeth 21 rotate to the position contacting the second limiting portion 13 and cannot continue to rotate, preventing the rotating member 2 from rotating to a position where it disengages from the driving gear 7 and ensuring normal operation. This steam valve structure can be applied to rice cookers with relatively large power, shortening the time for cooking rice and porridge. Moreover, it can adjust the area of the air outlet according to different powers, thereby preventing food from overflowing. Specifically, the maximum rising height that the upper cover assembly can reach is 15 mm, and the area of the corresponding air outlet can reach 3000 mm 2 .

[0091] As the first alternative embodiment of the above embodiment, the inner cover 3 may not be provided. The inner wall of the rotating member 2 forms a first exhaust passage, and a plurality of limiting cavities are formed on the bottom cover to limit the rotation of the upper cover assembly so that it can only move up and down. The limiting cavity can be an annular tube vertically extending on the base 1, and a columnar structure inserted into the annular tube is provided on the upper cover assembly.

[0092] As the second alternative embodiment of the above embodiment, the second motion conversion mechanism includes an inclined surface provided on the outer peripheral wall of the rotating member 2, and the lower end of the limiting column 42 abuts against the inclined surface.

[0093] As a third alternative embodiment of the above-described embodiment, a first microswitch and a second microswitch linked to the drive motor are spaced apart on the base 1. A second side plate 23 is provided outside the rotating member 2 on one side of the meshing teeth 21. When the upper cover assembly is in the initial position, the second side plate 23 contacts the first microswitch. When the upper cover assembly is in the highest rising position, the side of the meshing teeth 21 away from the second side plate 23 contacts the second microswitch. In this embodiment, when the rotating member 2 rotates to a position where the second side plate 23 contacts the first microswitch or the meshing teeth 21 contact the second microswitch, the power device 6 will be prompted to stop working.

[0094] Embodiment 2

[0095] This embodiment provides a device with a steam valve structure, including the steam valve structure provided in the above embodiment. This device can adjust the size of the air outlet to match the power, and there will be no phenomenon of food overflow.

[0096] Specifically, the device with the steam valve structure is a rice cooker. As Figure 8 shown, the steam valve structure is installed on the lid 9 of the rice cooker.

[0097] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A steam valve structure, characterized in that, Comprising: A base assembly on which a first exhaust passage adapted to communicate with a pot body is formed; An upper cover assembly which is liftably arranged on the base assembly and has an initial position covering the base assembly and a raised position spaced from the base assembly. When the upper cover assembly is in the raised position, a gap between the upper cover assembly and the base assembly forms a second exhaust passage, and the second exhaust passage communicates with the first exhaust passage; A driving device for driving the upper cover assembly to perform a lifting motion. The driving device includes a power device (6) and a transmission mechanism, and the transmission mechanism drives the upper cover assembly to perform a lifting motion under the drive of the power device (6); The base assembly includes: A base (1) on which the power device (6) is provided; A rotating member (2) which is rotatably arranged on the base (1) and rotates under the drive of the power device (6); The transmission mechanism includes: A first motion conversion mechanism connecting the power device (6) and the rotating member (2) and adapted to drive the rotating member (2) to rotate under the drive of the power device (6). The first motion conversion mechanism includes: a driving gear (7) connected to the power device (6) and adapted to rotate under the drive of the power device (6); a meshing tooth (21) provided on the rotating member (2) and meshing with the driving gear (7); A second motion conversion mechanism for converting the rotation of the rotating member (2) into the lifting motion of the upper cover assembly; A limiting structure for restricting the circumferential motion of the upper cover assembly; the second motion conversion mechanism includes: an inclined protrusion (22) provided on the outer peripheral wall of the rotating member (2); an inclined groove (41) provided on the upper cover assembly and cooperating with the inclined protrusion (22); The base (1) is provided with a first limiting portion (12) and a second limiting portion (13) at intervals. A second side plate (23) is provided on the outer side of the rotating member (2) on the side of the meshing tooth (21). When the upper cover assembly is in the initial position, the second side plate (23) contacts the first limiting portion (12). When the upper cover assembly is in the highest raised position, the side of the meshing tooth (21) away from the second side plate (23) abuts against the second limiting portion (13).

2. A steam valve structure, characterized in that, Comprising: A base assembly on which a first exhaust passage adapted to communicate with a pot body is formed; An upper cover assembly which is liftably arranged on the base assembly and has an initial position covering the base assembly and a raised position spaced from the base assembly. When the upper cover assembly is in the raised position, a gap between the upper cover assembly and the base assembly forms a second exhaust passage, and the second exhaust passage communicates with the first exhaust passage; A driving device for driving the upper cover assembly to perform a lifting motion. The driving device includes a power device (6) and a transmission mechanism, and the transmission mechanism drives the upper cover assembly to perform a lifting motion under the drive of the power device (6); The base assembly includes: Base (1) provided with the power device (6) thereon; Rotating member (2) rotatably provided on the base (1) and rotating under the drive of the power device (6); The transmission mechanism includes: First motion conversion mechanism connecting the power device (6) and the rotating member (2) and adapted to drive the rotating member (2) to rotate under the drive of the power device (6). The first motion conversion mechanism includes: a driving gear (7) connected to the power device (6) and adapted to rotate under the drive of the power device (6); meshing teeth (21) provided on the rotating member (2) and meshing with the driving gear (7); Second motion conversion mechanism for converting the rotation of the rotating member (2) into the lifting motion of the upper cover assembly; Limiting structure for restricting the circumferential motion of the upper cover assembly; the second motion conversion mechanism includes: an inclined protrusion (22) provided on the outer peripheral wall of the rotating member (2); an inclined groove (41) provided on the upper cover assembly and cooperating with the inclined protrusion (22); The base (1) is provided with a first microswitch and a second microswitch linked to the power device at intervals. A second side plate (23) is provided outside the rotating member (2) on one side of the meshing teeth (21). When the upper cover assembly is in the initial position, the second side plate (23) contacts the first microswitch. When the upper cover assembly is in the highest rising position, the side of the meshing teeth (21) away from the second side plate (23) contacts the second microswitch.

3. The steam valve structure according to claim 1 or 2, characterized in that, The limiting structure includes: Limiting posts (42) provided on the upper cover assembly; Limiting cavity provided on the base assembly for restricting the rotation of the limiting posts (42), and the limiting posts (42) are vertically movable in the limiting cavity.

4. The steam valve structure according to claim 3, wherein, The base assembly further includes an inner cover (3) fixedly connected to the base (1). The inner cover (3) includes a first annular body (33) adapted to be supported on the base (1), and the limiting cavity is a limiting hole (31) formed on the first annular body (33).

5. The steam valve structure according to claim 4, characterized in that A sealing ring (8) is provided in the limiting hole (31).

6. The steam valve structure according to claim 4, characterized in that, The inner cover (3) further includes a second annular body (34) extending downward from the lower end of the first annular body (33). The base (1) is provided with a first through hole, and the second annular body (34) is adapted to be embedded in the first through hole. A first exhaust passage is formed in the second annular body (34), and an installation cavity for installing the rotating member (2) is formed between the second annular body (34) and the outer peripheral wall of the base (1).

7. The steam valve structure according to claim 3, characterized in that, The upper cover assembly includes a support structure (4) and an upper cover (5) covering the support structure (4), and the limiting posts (42) are provided on the support structure (4).

8. The steam valve structure according to claim 7, characterized in that, The upper cover (5) is detachably connected to the support structure (4).

9. The steam valve structure according to claim 7, characterized in that, The lower end of the upper cover (5) is provided with an annular groove (52), and the support structure (4) includes a third annular body (43), and the third annular body (43) is adapted to be embedded in the annular groove (52).

10. The steam valve structure according to claim 9, wherein, The outer edge of the third annular body (43) is provided with a snap button (44), and the upper cover (5) is provided with a convex block (53) that cooperates with the snap button (44).

11. The steam valve structure according to claim 7, characterized in that, A first side plate (51) extends downward from the lower end of the upper cover (5).

12. The steam valve structure according to any one of claims 1-2, characterized in that, The power device (6) is a stepper motor.

13. A device with a steam valve structure, characterized in that, It includes the steam valve structure according to any one of claims 1-12.

14. The device with a steam valve structure according to claim 13, characterized in that, The device with the steam valve structure is an electric rice cooker.

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