CN219331315U - Upper cover and cooking utensil with same - Google Patents

Abstract

The utility model provides an upper cover and a cooking utensil with the same, wherein the upper cover comprises: the cover body comprises a buckling cover and an inner cover positioned below the buckling cover, a space between the buckling cover and the inner cover forms an exhaust cavity, and the inner cover is provided with a backflow hole which is arranged in a penetrating manner; the exhaust assembly comprises an exhaust pipe and a pressure limiting valve, the exhaust pipe vertically penetrates through the buckling cover, the lower end of the exhaust pipe extends into the exhaust cavity, the upper end of the exhaust pipe penetrates out of the buckling cover, and the pressure limiting valve is floatably arranged above the exhaust pipe; the backflow valve is vertically movably arranged on the buckling cover and is provided with a backflow position for opening the backflow hole and a blocking position for blocking the backflow hole; the driving piece is arranged on the cover body and is in driving connection with the backflow valve so as to drive the backflow valve to move between the backflow position and the blocking position. Through the technical scheme that this application provided, can solve the thick liquid among the correlation technique and flow from the upper cover, influence user's use experience's problem.

Description

Upper cover and cooking utensil with same

Technical Field

The utility model relates to the technical field of small household appliances, in particular to an upper cover and a cooking appliance with the same.

Background

The electric pressure cooker can make water reach higher temperature without boiling by the principle that the boiling point of liquid is raised under higher air pressure so as to accelerate the efficiency of stewing food.

In the related art, the electric pressure cooker comprises a cooker body and an upper cover covered on the cooker body, and after the cooking process of the electric pressure cooker is finished, in order to realize quick cover opening, the air in the cooker body is exhausted manually by pressing an exhaust button, so that the air in the cooker body is exhausted through a pressure limiting valve.

However, after the electric pressure cooker in the related art is rapidly opened, since slurry may exist in the upper cover, the slurry may flow out of the upper cover when the upper cover is opened, which affects the use experience of a user.

Disclosure of Invention

The utility model provides an upper cover and a cooking utensil with the upper cover, and aims to solve the problem that slurry in the related technology flows out of the upper cover to influence the use experience of a user.

According to an aspect of the present utility model, there is provided an upper cover comprising: the cover body comprises a buckling cover and an inner cover positioned below the buckling cover, a space between the buckling cover and the inner cover forms an exhaust cavity, and the inner cover is provided with a backflow hole which is arranged in a penetrating manner; the exhaust assembly comprises an exhaust pipe and a pressure limiting valve, the exhaust pipe vertically penetrates through the buckling cover, the lower end of the exhaust pipe extends into the exhaust cavity, the upper end of the exhaust pipe penetrates out of the buckling cover, and the pressure limiting valve is floatably arranged above the exhaust pipe; the backflow valve is vertically movably arranged on the buckling cover and is provided with a backflow position for opening the backflow hole and a blocking position for blocking the backflow hole; the driving piece is arranged on the cover body and is in driving connection with the backflow valve so as to drive the backflow valve to move between the backflow position and the blocking position.

By applying the technical scheme of the utility model, the upper cover comprises the cover body, the exhaust assembly, the reflux valve and the driving piece, and before the upper cover is opened after cooking is finished, the reflux valve is driven by the driving piece to switch from the blocking position for blocking the reflux hole to the reflux position for opening the reflux hole, so that high-pressure steam in the cooking cavity enters the exhaust cavity between the buckling cover and the inner cover through the reflux hole, and the high-pressure steam in the exhaust cavity enters the exhaust pipe and is pushed to be discharged by the pressure limiting valve. And, the slurry following the high pressure steam into the exhaust chamber may be returned to the cooking chamber through the return hole so that there is no slurry in the exhaust chamber. Therefore, when the upper cover is opened, slurry does not remain in the cover body, and water does not flow out of the upper cover, so that the use experience of a user is enhanced.

Further, the upper cover further comprises a control piece and a detection piece for detecting the position of the backflow valve, and the control piece is respectively and electrically connected with the detection piece and the driving piece. The position state of the reflux valve can be detected by adopting the detection part, and the working state of the driving part is controlled by utilizing the control part according to the detected position of the reflux valve.

Further, the detection piece comprises a first limit switch and a second limit switch positioned above the first limit switch, the first limit switch and the second limit switch are both arranged on the buckling cover, when the reflux valve is positioned at the blocking position, the reflux valve is contacted with the first limit switch, and when the reflux valve is positioned at the reflux position, the reflux valve is contacted with the second limit switch. The detection piece adopting the first limit switch and the second limit switch has the advantages of simple detection structure and convenience in setting.

Further, the buckling cover is provided with a first limiting block and a second limiting block, the first limiting block and the second limiting block are arranged on the buckling cover, when the backflow valve is located at the plugging position, the backflow valve is in contact with the first limiting block, and when the backflow valve is located at the backflow position, the backflow valve is in contact with the second limiting block. The limiting mode that the first limiting block and the second limiting block are contacted with the reflux valve is utilized, and the limiting structure is simple and convenient to set.

Further, the driving member includes a driving motor, and an output shaft of the driving motor is in driving connection with the return valve. Through setting up the driving piece into driving motor, have drive simple structure, the advantage of being convenient for set up.

Further, the upper cover also comprises a transmission part, the transmission part comprises a lifting wheel connected with the reflux valve, the cover body is provided with a threaded hole which is penetrated, the side wall of the reflux valve is provided with external threads, the external threads are in threaded fit with the threaded hole, and the driving part is in driving connection with the lifting wheel to drive the lifting wheel to rotate. By adopting the structure, the rotary motion of the lifting wheel can be converted into the vertical motion of the reflux valve by utilizing the threaded fit, so that the reflux valve is switched between the blocking position and the reflux position.

Further, the transmission part further comprises a transmission wheel connected with the driving part, a first gear ring is arranged on the side wall of the transmission wheel, a second gear ring is arranged on the side wall of the lifting wheel, and the first gear ring is meshed with the second gear ring. The transmission structure with the lifting wheel meshed with the transmission wheel gear has the advantages of simple and reliable transmission structure.

Further, the thickness dimension of the driving wheel and/or the lifting wheel is greater than or equal to the movement stroke of the reflux valve between the blocking position and the reflux position. By adopting the structure, the lifting wheel can be kept in a meshed state with the driving wheel at any time in the vertical movement process, so that the reflux valve has enough travel to open the reflux hole.

Further, the cover body comprises a bracket arranged on the buckling cover, the threaded hole is arranged on the bracket, and the bracket is adopted, so that the processing of the threaded hole is facilitated; a sealing ring is clamped between the buckling cover and the bracket, the outer wall of the sealing ring is attached to the buckling cover, the inner wall of the sealing ring is attached to the side wall of the backflow valve, and the sealing ring is utilized to form a sealing effect, so that steam in the exhaust cavity cannot enter the buckling cover through a gap between the backflow valve and the buckling cover, and damage to components in the buckling cover is prevented; the cover body also comprises a shielding cover which is arranged above the buckling cover and connected with the buckling cover, the upper end of the exhaust pipe penetrates out of the shielding cover, the pressure limiting valve is positioned above the shielding cover, and the shielding cover is adopted to shield and protect components on the buckling cover so as to prevent damage to the components.

According to another aspect of the present utility model, there is provided a cooking appliance including: a pot body having a cooking cavity; the upper cover is arranged on the pot body in an openable and closable manner, the backflow valve of the upper cover is provided with a backflow position for opening the backflow hole to communicate the cooking cavity and the exhaust cavity and a blocking position for blocking the backflow hole to isolate the cooking cavity and the exhaust cavity, and the upper cover is provided with the upper cover. By adopting the cooking utensil, the backflow valve is driven by the driving piece to switch from the blocking position for blocking the backflow hole to the backflow position for opening the backflow hole, so that high-pressure steam in the cooking cavity enters the exhaust cavity between the buckling cover and the inner cover through the backflow hole, and the high-pressure steam in the exhaust cavity enters the exhaust pipe and is pushed to be discharged by the pressure limiting valve. And, the slurry following the high pressure steam into the exhaust chamber may be returned to the cooking chamber through the return hole so that there is no slurry in the exhaust chamber. Therefore, when the upper cover is opened, slurry does not remain in the cover body, and water does not flow out of the upper cover, so that the use experience of a user is enhanced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 illustrates a cross-sectional view of a cooking appliance provided by an embodiment of the present utility model;

FIG. 2 shows a partial enlarged view at A in FIG. 1;

fig. 3 is a schematic structural view of a back flow valve of an upper cover in a blocking position according to an embodiment of the present utility model;

FIG. 4 is a schematic view showing a structure of a return valve of an upper cover in a return position according to an embodiment of the present utility model;

FIG. 5 shows an exploded view of the return valve and lift wheel of the upper cover provided by an embodiment of the present utility model;

FIG. 6 shows a top view of a snap-on cover for an upper cover provided by an embodiment of the present utility model;

fig. 7 shows a schematic structural diagram of a snap-fit cover of an upper cover according to an embodiment of the present utility model.

Wherein the above figures include the following reference numerals:

10. a cover body; 11. a buckling cover; 111. a threaded hole; 12. an inner cover; 121. a reflow hole; 13. an exhaust chamber; 14. a bracket; 15. a seal ring;

20. an exhaust assembly; 21. a pressure limiting valve;

30. a return valve;

40. a driving member; 41. A drive motor;

50. a detecting member; 51. A first limit switch; 52. A second limit switch;

60. a transmission member; 61. A lifting wheel; 62. A driving wheel;

70. a pot body; 71. a cooking chamber.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 7, the embodiment of the present utility model provides an upper cover, which includes a cover body 10, an exhaust assembly 20, a backflow valve 30 and a driving member 40, wherein the cover body 10 includes a fastening cover 11 and an inner cover 12 positioned below the fastening cover 11, a space between the fastening cover 11 and the inner cover 12 forms an exhaust chamber 13, and the inner cover 12 has a backflow hole 121 penetrating therethrough; the exhaust assembly 20 comprises an exhaust pipe and a pressure limiting valve 21, the exhaust pipe vertically penetrates through the buckling cover 11, the lower end of the exhaust pipe extends into the exhaust cavity 13, the upper end of the exhaust pipe penetrates out of the buckling cover 11, and the pressure limiting valve 21 is floatably arranged above the exhaust pipe; the reflux valve 30 is vertically movably arranged on the buckling cover 11, and the reflux valve 30 is provided with a reflux position for opening the reflux hole 121 and a blocking position for blocking the reflux hole 121; a driving member 40 is provided on the cover body 10, and the driving member 40 is in driving connection with the backflow valve 30 to drive the backflow valve 30 to move between the backflow position and the blocking position.

By applying the technical scheme of the utility model, the upper cover comprises the cover body 10, the exhaust assembly 20, the reflux valve 30 and the driving piece 40, and before the upper cover is opened after cooking, the reflux valve 30 is driven by the driving piece 40 to switch from the blocking position for blocking the reflux hole 121 to the reflux position for opening the reflux hole 121, so that high-pressure steam in the cooking cavity 71 enters the exhaust cavity 13 between the buckling cover 11 and the inner cover 12 through the reflux hole 121, and the high-pressure steam in the exhaust cavity 13 enters the exhaust pipe and pushes the pressure limiting valve 21 to be discharged. And, the slurry following the high pressure steam into the exhaust chamber 13 may flow back into the cooking chamber 71 through the return hole 121 so that there is no slurry in the exhaust chamber 13. Therefore, when the upper cover is opened, no slurry remains in the cover body 10, and no water flows out of the upper cover, so that the use experience of a user is enhanced.

In other embodiments, a communication hole for communicating the exhaust chamber 13 and the cooking chamber 71 may be provided in the inner cover 12, and pressurized steam in the cooking chamber 71 enters the exhaust chamber 13 through the communication hole, and slurry in the exhaust chamber 13 flows back into the cooking chamber 71 through the return hole 121. Wherein, in order to maintain the tightness of the cooking cavity 71 of the pot body 70, a stop valve is arranged at the communication hole, when the cooking appliance is in a cooking state, the stop valve seals the communication hole, the cooking cavity 71 forms a closed cavity to finish pressure cooking, and after the cooking is finished, the communication hole is opened, so that high-pressure steam in the cooking cavity 71 enters the exhaust cavity 13 through the communication hole.

Specifically, since the exhaust chamber 13 is provided, slurry is left on the inner lid 12 when pressure steam in the cooking chamber 71 enters the exhaust chamber 13. If the slurry remaining on the inner lid 12 is not handled in time, the slurry flows out from the inside of the upper lid when the upper lid is opened. By providing the return hole 121, the slurry can be returned into the pan body 70.

As shown in fig. 3, 4 and 6, the upper cover further includes a check member 50 for detecting the position of the return valve 30 and a check member electrically connected to the check member 50 and the driving member 40, respectively. With the detecting member 50, the position state of the return valve 30 can be detected, and the operating state of the driving member 40 can be controlled by the control member according to the detected position of the return valve 30.

As shown in fig. 3 and 4, the detecting member 50 includes a first limit switch 51 and a second limit switch 52 located above the first limit switch 51, the first limit switch 51 and the second limit switch 52 are both disposed on the buckling cover 11, when the backflow valve 30 is located at the blocking position, the backflow valve 30 is in contact with the first limit switch 51, and when the backflow valve 30 is located at the backflow position, the backflow valve 30 is in contact with the second limit switch 52. The detection piece 50 adopting the first limit switch 51 and the second limit switch 52 has the advantages of simple detection structure and convenient arrangement.

In this embodiment, when the cooking apparatus is in the cooking state, the first limit switch 51 can detect whether the backflow valve 30 is located at the blocking position, and if the backflow valve 30 is not located at the blocking position, the control member can be used to drive the driving member 40, so that the driving member 40 drives the backflow valve 30 to move to the blocking position, so that the cooking cavity 71 is a closed cavity, and can be quickly pressed. If the return valve 30 is in the blocking position, no action is required.

Specifically, when the return valve 30 moves upward to the return position, the return valve 30 contacts the second limit switch 52, and at this time, the control member controls the driving member 40 to stop operating. When the return valve 30 moves down to the blocking position, the return valve 30 contacts the first limit switch 51, and at this time, the control member controls the driving member 40 to stop working.

In other embodiments, the buckling cover 11 is provided with a first limiting block and a second limiting block, both of which are disposed on the buckling cover 11, when the backflow valve 30 is located at the plugging position, the backflow valve 30 is in contact with the first limiting block, and when the backflow valve 30 is located at the backflow position, the backflow valve 30 is in contact with the second limiting block. The limiting mode of contacting the reflux valve 30 by the first limiting block and the second limiting block has the advantages of simple limiting structure and convenient setting.

In this embodiment, when the backflow valve 30 moves to contact with the first limit block or the second limit block, a limit fit is formed, at this time, since friction force is generated between the backflow valve 30 and the first limit block or the second limit block, the current of the driving motor changes, and the control member can control the working state according to the current change of the driving motor 41.

As shown in fig. 6, the driving member 40 includes a driving motor 41, and an output shaft of the driving motor 41 is drivingly connected to the return valve 30. By providing the driving member 40 as the driving motor 41, there is an advantage in that the driving structure is simple and the setting is facilitated.

As shown in fig. 1, 2 and 6, the upper cover further includes a transmission member 60, the transmission member 60 includes a lifting wheel 61 connected to the backflow valve 30, the cover 10 has a threaded hole 111 penetrating through it, the sidewall of the backflow valve 30 is provided with external threads, the external threads are in threaded engagement with the threaded hole 111, and the driving member 40 is in driving connection with the lifting wheel 61 to drive the lifting wheel 61 to rotate. With the above-described structure, the rotational movement of the lifting wheel 61 can be converted into the vertical movement of the return valve 30 by screw engagement, so that the return valve 30 is switched between the blocking position and the return position.

In the present embodiment, the lifting wheel 61 is fixedly connected to the return valve 30, and the lifting wheel 61 is vertically moved while rotating.

As shown in fig. 1, 2 and 6, the transmission member 60 further includes a transmission wheel 62 connected to the driving member 40, a first gear ring is disposed on a sidewall of the transmission wheel 62, and a second gear ring is disposed on a sidewall of the lifting wheel 61, where the first gear ring is engaged with the second gear ring. The transmission structure of gear engagement of the lifting wheel 61 and the transmission wheel 62 has the advantages of simple and reliable transmission structure.

In this embodiment, the driving motor 41 drives the driving wheel 62 to rotate, the first gear ring on the driving wheel 62 drives the second gear ring meshed with the driving wheel 62 to rotate, so that the lifting wheel 61 rotates, and through the threaded fit of the remaining threaded hole 111 of the lifting wheel 61, the rotary motion of the lifting wheel 61 can be converted into the vertical motion of the reflux valve 30, so that the reflux valve 30 is switched between the blocking position and the reflux position.

Wherein the thickness dimension of the driving wheel 62 and/or the lifting wheel 61 is greater than or equal to the travel of the return valve 30 between the blocking position and the return position. With the above structure, the lifting wheel 61 can be kept engaged with the driving wheel 62 at any time during the vertical movement, so that the return valve 30 has a sufficient stroke to open the return hole 121.

In the present embodiment, the thickness dimension of the lifting wheel 61 is larger than the moving stroke of the backflow valve 30 between the blocking position and the backflow position, and with the above structure, the thickness dimension of the driving wheel 62 can be reduced, and thus the occupied space of the driving wheel 62 can be reduced.

As shown in fig. 1 and 2, the cover body 10 includes a bracket 14 provided on the snap-fit cover 11, and the screw hole 111 is provided on the bracket 14, and the bracket 14 is adopted, which has an advantage of facilitating processing of the screw hole 111.

In this embodiment, a sealing ring 15 is clamped between the buckling cover 11 and the bracket 14, the outer wall of the sealing ring 15 is attached to the buckling cover 11, the inner wall of the sealing ring 15 is attached to the side wall of the backflow valve 30, and a sealing effect can be formed by using the sealing ring 15, so that steam in the exhaust cavity 13 can not enter the buckling cover 11 through a gap between the backflow valve 30 and the buckling cover 11, and damage to components in the buckling cover 11 is prevented.

In this embodiment, the lower end of the backflow valve 30 is sleeved with an orifice sealing ring, and when the backflow valve 30 is located at the blocking position, the lower surface of the orifice sealing ring is attached to the orifice of the backflow hole 121. With the orifice sealing ring, the sealing performance of the return orifice 121 can be enhanced, so that the cooking appliance can be rapidly pressed up during pressure cooking.

The cover body 10 further comprises a shielding cover arranged above the buckling cover 11 and connected with the buckling cover 11, the upper end of the exhaust pipe penetrates out of the shielding cover, and the pressure limiting valve 21 is arranged above the shielding cover. The shielding cover can shield and protect the components on the fastening cover 11 so as to prevent the damage of the components.

Yet another embodiment of the present utility model provides a cooking appliance including a pot 70 and an upper cover, the pot 70 having a cooking cavity 71; the upper cover is openably and closably provided on the pot body 70, and the return valve 30 of the upper cover has a return position to open the return hole 121 to communicate the cooking cavity 71 and the exhaust cavity 13 and a blocking position to block the return hole 121 to isolate the cooking cavity 71 and the exhaust cavity 13, and is provided as described above. With this cooking appliance, the return valve 30 is driven by the driving member 40 to switch from the blocking position for blocking the return hole 121 to the return position for opening the return hole 121, so that the high-pressure steam in the cooking cavity 71 enters the exhaust cavity 13 between the fastening cover 11 and the inner cover 12 through the return hole 121, and the high-pressure steam in the exhaust cavity 13 enters the exhaust pipe and pushes the pressure limiting valve 21 to be discharged. And, the slurry following the high pressure steam into the exhaust chamber 13 may flow back into the cooking chamber 71 through the return hole 121 so that there is no slurry in the exhaust chamber 13. Therefore, when the upper cover is opened, no slurry remains in the cover body 10, and no water flows out of the upper cover, so that the use experience of a user is enhanced.

Specifically, a pot sealing ring is provided between the inner lid 12 and the pot 70, and when the upper lid is provided on the pot 70, the inner lid 12 and the pot 70 are sealed by the pot sealing ring to form a closed cooking cavity 71.

The cooking utensil comprises an electric cooker or an electric pressure cooker or a multifunctional heating cooker with the functions of baking, cooking and cooking.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An upper cover, characterized in that the upper cover comprises:

the cover body (10) comprises a buckling cover (11) and an inner cover (12) positioned below the buckling cover (11), a space between the buckling cover (11) and the inner cover (12) forms an exhaust cavity (13), and the inner cover (12) is provided with a backflow hole (121) which is arranged in a penetrating manner;

the exhaust assembly (20) comprises an exhaust pipe and a pressure limiting valve (21), the exhaust pipe vertically penetrates through the buckling cover (11), the lower end of the exhaust pipe extends into the exhaust cavity (13), the upper end of the exhaust pipe penetrates out of the buckling cover (11), and the pressure limiting valve (21) is floatably arranged above the exhaust pipe;

a reflux valve (30) which is vertically movably arranged on the buckling cover (11), wherein the reflux valve (30) is provided with a reflux position for opening the reflux hole (121) and a blocking position for blocking the reflux hole (121);

the driving piece (40) is arranged on the cover body (10), and the driving piece (40) is in driving connection with the backflow valve (30) so as to drive the backflow valve (30) to move between the backflow position and the blocking position.

2. The upper cover according to claim 1, characterized in that it further comprises a control element and a detection element (50) for detecting the position of the return valve (30), said control element being electrically connected to the detection element (50) and to the driving element (40), respectively.

3. The upper cover according to claim 2, wherein the detecting member (50) comprises a first limit switch (51) and a second limit switch (52) located above the first limit switch (51), the first limit switch (51) and the second limit switch (52) are both disposed on the snap-fit cover (11), when the backflow valve (30) is located at the blocking position, the backflow valve (30) is in contact with the first limit switch (51), and when the backflow valve (30) is located at the backflow position, the backflow valve (30) is in contact with the second limit switch (52).

4. The upper cover according to claim 1, wherein a first stopper and a second stopper are provided on the snap cover (11), the first stopper and the second stopper are both provided on the snap cover (11), the return valve (30) is in contact with the first stopper when the return valve (30) is in the blocking position, and the return valve (30) is in contact with the second stopper when the return valve (30) is in the return position.

5. Upper cover according to claim 1, characterized in that the drive member (40) comprises a drive motor (41), the output shaft of the drive motor (41) being in driving connection with the return valve (30).

6. The upper cover according to any one of claims 1 to 5, further comprising a transmission member (60), wherein the transmission member (60) comprises a lifting wheel (61) connected with the backflow valve (30), the cover body (10) is provided with a threaded hole (111) penetrating through the cover body, the side wall of the backflow valve (30) is provided with external threads, the external threads are in threaded fit with the threaded hole (111), and the driving member (40) is in driving connection with the lifting wheel (61) to drive the lifting wheel (61) to rotate.

7. The upper cover according to claim 6, wherein the transmission member (60) further comprises a transmission wheel (62) connected with the driving member (40), a first gear ring is arranged on the side wall of the transmission wheel (62), a second gear ring is arranged on the side wall of the lifting wheel (61), and the first gear ring is meshed with the second gear ring.

8. Upper cover according to claim 7, characterized in that the thickness dimension of the driving wheel (62) and/or the lifting wheel (61) is greater than or equal to the travel of the return valve (30) between the blocking position and the return position.

9. The upper cover according to claim 6, wherein,

the cover body (10) comprises a bracket (14) arranged on the buckling cover (11), and the threaded hole (111) is arranged on the bracket (14);

a sealing ring (15) is clamped between the buckling cover (11) and the bracket (14), the outer wall of the sealing ring (15) is attached to the buckling cover (11), and the inner wall of the sealing ring (15) is attached to the side wall of the backflow valve (30);

the cover body (10) further comprises a shielding cover which is arranged above the buckling cover (11) and connected with the buckling cover (11), the upper end of the exhaust pipe penetrates out of the shielding cover, and the pressure limiting valve (21) is arranged above the shielding cover.

10. A cooking appliance, the cooking appliance comprising:

a pan body (70) having a cooking cavity (71);

an upper cover which is openably and closably provided on the pan body (70), the backflow valve (30) of which has a backflow position to open a backflow hole (121) to communicate the cooking chamber (71) and the exhaust chamber (13) and a blocking position to block the backflow hole (121) to isolate the cooking chamber (71) and the exhaust chamber (13), the upper cover being the upper cover according to any one of claims 1 to 9.

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