CN216724220U

CN216724220U - Steam valve and have its cooking utensil

Info

Publication number: CN216724220U
Application number: CN202121770801.8U
Authority: CN
Inventors: 张红乐
Original assignee: Zhejiang Supor Electrical Appliances Manufacturing Co Ltd
Current assignee: Zhejiang Supor Electrical Appliances Manufacturing Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-06-14
Anticipated expiration: 2031-07-30

Abstract

The utility model discloses a steam valve and a cooking utensil with the same, wherein the steam valve comprises a steam valve main body and a reflux valve, the steam valve main body comprises a bottom wall, the bottom wall is provided with a reflux port and a mounting hole, the reflux valve comprises a baffle and a positioning part, the baffle is positioned below the positioning part and connected with the positioning part, the positioning part is arranged in the mounting hole, the baffle is positioned below the reflux port to cover the reflux port, the center of the positioning part is spaced from the gravity center of the baffle, the baffle is movably arranged between an initial position and a movable position, the initial position and the movable position are inclined downwards relative to the reflux port, and the inclination of the baffle at the movable position is larger than that of the baffle at the initial position. According to the steam valve provided by the utility model, the backflow valve is arranged to be movable relative to the backflow port, so that the liquid can quickly flow back, secondary bubbles are prevented, the anti-overflow effect can be improved, the phenomenon of pot overflow is avoided, and the use experience of consumers is improved.

Description

Steam valve and have its cooking utensil

Technical Field

The utility model relates to the technical field of kitchen electrical appliances, in particular to a steam valve and a cooking appliance with the same.

Background

In the existing cooking appliances such as electric cookers and the like, because bubbles and a small amount of food are entrained in steam, when the bubbles are continuously accumulated in a steam valve to a certain amount, the bubbles can block the steam from being discharged outwards, so that the food overflows. Thus, the lid body is generally provided with a member or device having a bubble breaking function.

The existing bubble breaking parts or devices include two types, one is to break the bubble by mechanical power through arranging a movable part, and the other is to break the bubble in the steam flowing process through improving the structure of the steam channel. However, the steam channel with the bubble breaking function is generally vertical, and is also provided with an annular steam channel, and the channel structures can be provided with deformable blocking sheets at the backflow port, so that the blocking sheets are deformed by the gravity of liquid to enable the liquid to flow out of the backflow port. The backflow structure can cause liquid not to flow back in time, secondary bubbles are generated to cause overflowing, and the use experience of consumers is greatly influenced.

Therefore, a steam valve and a cooking appliance having the same are needed to at least partially solve the above problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content of the present invention is not intended to define key features or essential features of the claimed solution, nor is it intended to be used to limit the scope of the claimed solution.

To at least partially solve the above problems, the present invention provides a steam valve for a cooking appliance, the steam valve comprising:

the steam valve comprises a steam valve main body and a steam valve, wherein the steam valve main body comprises a bottom wall, and the bottom wall is provided with a backflow port and a mounting hole; and

the reflux valve comprises a baffle and a positioning part, the baffle is positioned below the positioning part and connected with the positioning part, the positioning part is arranged in the mounting hole, the baffle is positioned below the reflux opening to cover the reflux opening,

the center of the positioning part is spaced from the gravity center of the baffle, the baffle is movably arranged between an initial position and a movable position, the initial position and the movable position are inclined downwards relative to the backflow port, and the inclination of the baffle located at the movable position is larger than that of the baffle located at the initial position.

According to the scheme, the center of the positioning part is spaced from the gravity center of the baffle plate, so that the baffle plate can keep inclining under the action of self gravity, a smaller gap is formed between the baffle plate and the backflow port, and the backflow valve is kept in an opening state at an initial position at the moment. Therefore, liquid can be drained when the liquid at the backflow port is less, and compared with a conventional backflow valve, the backflow valve has a better liquid drainage effect.

Because the separation blade can move between the initial position of slope and the different positions that the inclination is bigger than the initial position promptly the active site for the separation blade can be automatically followed initial position downward sloping under the effect of a certain amount of liquid weight, moves to the active site, makes the clearance increase between separation blade and the backward flow mouth, and the backward flow valve keeps open state at the active site that the inclination is bigger this moment. From this, when there is the hydrops in return flow mouth department, the steam valve can be followed great clearance outflow easily to more liquid, and the handling capacity increase of backwash valve to can improve the flowing back effect of backwash valve. When the liquid is less or not present, the baffle automatically resets to the initial position.

The reflux valve provided by the utility model can be always kept in a normally open state and has two working states with different opening degrees. When the cooking appliance works, the reflux valve can be switched between two working states according to the liquid amount in the steam valve, and liquid can be drained controllably. From this, can realize the quick backward flow of liquid, prevent the production of secondary bubble to can improve the anti-overflow effect, avoid overflowing the emergence of pot phenomenon, promote consumer's use and experience.

Optionally, the backflow port is located on a side of the center of gravity of the baffle plate with respect to the mounting hole, and/or a center of the backflow port is located on a side opposite to the side of the mounting hole with respect to the center of gravity of the baffle plate.

According to this scheme, the position setting of backward flow mouth can make the gravity of liquid can act on the separation blade better, can make the separation blade produce bigger slope, and simultaneously, the position of backward flow mouth is more close to the clearance that forms between separation blade and the diapire behind the slope to the flowing back of better.

Optionally, the center of gravity of the flap coincides with the center of the flap, and/or the flap is a circular flap.

According to the scheme, the baffle plate has a geometric shape of specification, and is convenient to produce, manufacture and install.

Optionally, the bottom wall is provided with a downwardly extending annular limiting wall, and the baffle is located in the limiting wall.

According to the scheme, the movement of the blocking sheet in the horizontal direction can be limited, so that the reflux valve is kept stable in the working process, the phenomenon of shaking except the up-down tilting action is avoided, and the working performance of the reflux valve is improved.

Optionally, a minimum distance d1 is provided between the baffle plate at the initial position and the bottom wall, and a minimum distance d2 is provided between the side of the positioning part and the limiting wall, wherein d1 is more than or equal to 0.5mm, and d2 is more than or equal to 0.5 mm.

According to the scheme, a gap exists between the blocking piece and the bottom wall when the blocking piece is at the initial position, and a gap exists between the blocking piece and the bottom wall when the blocking piece is at the initial position, so that the blocking piece can move between the initial position and the movable position smoothly, and the movement of the blocking piece is not interfered.

Optionally, the angle of inclination α of the blocking piece in the movable position is in the range of α ≦ 10 °.

According to the scheme, liquid can flow downwards rapidly along the upper surface of the baffle plate, and bubbles in steam can be prevented from entering the steam valve from a gap between the baffle plate and the bottom wall.

And/or the separation blade is a silica gel piece.

According to the scheme, the blocking piece can deform. When the hydrops of backward flow mouth department is more, the separation blade can take place deformation under the hydrops effect, and this can further increase the clearance between separation blade and the backward flow mouth. Therefore, the treatment capacity of the reflux valve can be improved, and the liquid drainage effect is better.

Optionally, the backflow valve further comprises a limiting portion, the limiting portion is connected with the top of the positioning portion, the periphery of the limiting portion protrudes out of the peripheral side surface of the positioning portion, and the periphery of the limiting portion is abutted to the upper surface of the bottom wall.

According to this scheme, the backward flow valve can block connect to the steam valve main part, makes things convenient for the installation and the dismantlement of backward flow valve to the simple structure of backward flow valve makes things convenient for manufacturing.

Optionally, the positioning part is rod-shaped, and the limiting part is conical.

According to the scheme, the conical surface of the limiting part is used as the guide surface, so that the limiting part can be easily and accurately and quickly inserted into the mounting hole, and the assembly efficiency is improved; and the return valve has simple structure and is convenient to produce and manufacture.

Optionally, the steam valve body further comprises:

an outer annular wall having an upstream end and a downstream end, the upstream end being spaced from the downstream end in a circumferential direction of the steam valve;

an outer extending wall connected to the upstream end; and

an inner extension wall connected to the downstream end and at least a portion of which is located inside the outer extension wall in a radial direction of the steam valve, the inner extension wall and the outer extension wall being located on the same side of a center of the steam valve body, an extension end of the inner extension wall having an end surface,

wherein the outer extending wall, the inner extending wall and the bottom wall define a bubble breaking channel provided with at least one air inlet.

According to the scheme, the bubbles can be quickly broken by means of the bubble breaking channel, and effective bubble breaking is achieved. The bubble-breaking channel forms an open outlet at the extended end of the inner extended wall, the steam can be rapidly expanded while changing the speed and pressure of the steam when flowing through the extended end of the inner extended wall, and the bubbles can be rapidly broken by the influence of the speed and pressure change.

Optionally, the outer annular wall, the inner extension wall and the bottom wall define a backflow cavity, the bottom wall of the backflow cavity being provided with the backflow port.

According to the scheme, the steam valve main body can form the backflow cavity with the top open and the bottom closed, and separated liquid can be gathered on the upper surface of the bottom wall and flows out from the backflow port; the space size of backward flow chamber is great, is favorable to the bubble to expand fast at the extension end of extending the wall in, and the pressure of steam can reduce fast.

Optionally, the inner surface of the outer extending wall and the outer surface of the inner extending wall face each other and are both planar.

According to the scheme, the bottom surface of the air inlet is not provided with a structure for blocking steam to enter, and the steam can uniformly enter the bubble breaking channel at the air inlet, so that the speed of the steam is not influenced, and a better bubble breaking effect is obtained.

And/or the at least one air inlet is located at an air inlet end of the bubble-breaking channel remote from the upstream end.

According to the present aspect, the steam entering from the air inlet can flow smoothly and uniformly in the bubble-breaking channel to expand rapidly at the extended end of the inner extension wall, further accelerating the breaking of the bubbles.

Optionally, the inner surface of the outer extension wall is tangential to the inner surface of the outer annular wall.

According to this scheme, the steam in the broken bubble passageway can follow the direction that is parallel with tangential direction and gets into backward flow chamber, and the extension that extends the wall when steam leaves broken bubble passageway is held easy inflation and easy breakage, gets into backward flow chamber through the direction with steam along being parallel with tangential direction, can guarantee that steam can smoothly and higher speed get into in this department, can take away more liquid, prevents to pile up too much liquid to obtain better broken bubble effect.

The outer extension wall is parallel to the inner extension wall or the inner extension wall is inclined toward a side of the center of the steam valve body with respect to the outer extension wall.

According to the scheme, in the scheme that the outer extension wall is parallel to the inner extension wall, the bubble breaking channel with the unchanged sectional area can be formed, and steam uniformly flows in the bubble breaking channel, so that the speed of the steam is not influenced, and a better bubble breaking effect is obtained. The steam valve of the embodiment has the advantages of neat and simple structure and convenience in production and manufacturing;

in the scheme that the inner extension wall is inclined relative to the outer extension wall, the cross section area of the formed bubble breaking channel is gradually increased along the direction far away from the air inlet, steam is gradually expanded in the bubble breaking channel, and the steam is rapidly expanded away from the bubble breaking channel, so that bubbles are broken.

Optionally, the bottom wall includes a backflow inclined wall disposed around the outer annular wall and a horizontal bottom wall located inside the backflow inclined wall and extending obliquely downward from the outer annular wall to the horizontal bottom wall, the backflow port and the mounting hole are both disposed in the horizontal bottom wall, the backflow inclined wall is disposed between the outer extension wall and the inner extension wall, and the backflow inclined wall extends obliquely downward from the outer extension wall to the inner extension wall.

According to this scheme, through the liquid that separates because of the centrifugal force that outer rampart produced can follow the backward flow mouth of outer ring wall to horizontal diapire fast along the oblique wall of backward flow, even if there is under the separated condition of a large amount of liquid, the phenomenon of liquid gathering can not take place yet to guarantee gas-liquid separation's effect, improved the backward flow efficiency of steam valve, further avoid the emergence of excessive pot phenomenon. Can assemble the liquid in the broken bubble passageway fast, the liquid after assembling flows to the backward flow chamber from broken bubble passageway, avoids hydrops in broken bubble passageway.

Optionally, the angle of inclination β of the return ramp wall is in the range of 8 ° ≦ β ≦ 45 °.

According to the scheme, not only can the liquid flow downwards rapidly, but also the gas-liquid separation effect can be ensured.

According to another aspect of the present invention, there is provided a cooking appliance comprising a lid and a pot body, the lid being openably and closably provided to the pot body, the lid comprising the steam valve according to any one of the above aspects.

Optionally, the cover body comprises a surface cover and a heat preservation member located below the surface cover, a steam valve sealing ring of the steam valve is clamped between the surface cover and the heat preservation member, the heat preservation member is provided with a through hole, the steam valve sealing ring is arranged at the through hole, the steam valve main body is also arranged at the through hole, and the outer annular wall and the outer extension wall are abutted against the lower surface of the heat preservation member.

According to this scheme, can easily with steam valve detachably install in the lid to the piece that keeps warm is located the upper end of steam valve main part, and partly can enclose into broken bubble passageway and backward flow chamber with the steam valve main part of keeping warm.

Optionally, the inner extension wall is entirely abutted against the heat insulating member, or

The steam valve sealing ring is provided with an annular wall with a part positioned in the through hole, and the inner extension wall is completely abutted against the annular wall or is simultaneously abutted against the annular wall and the heat preservation piece.

According to the scheme, in the scheme that the inner extension wall is completely abutted against the heat preservation piece, the heat preservation piece is formed into the top of the bubble breaking channel; in the scheme that the inner extension wall is abutted to the steam valve sealing ring, the steam valve sealing ring and the heat preservation piece form the top of the foam breaking channel; in the two schemes, the periphery of the bubble breaking channel is separated, and steam can only enter the bubble breaking channel from the air inlet.

Drawings

The following drawings of the utility model are included to provide a further understanding of the utility model. The drawings illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model.

In the drawings:

FIG. 1 is an exploded perspective view of a cover according to the present invention;

FIG. 2 is a schematic cross-sectional view of the cover shown in FIG. 1;

fig. 3 is an enlarged view of a portion a in fig. 2;

FIG. 4 is a schematic bottom view of the face cover shown in FIG. 1;

FIG. 5 is a schematic perspective view of the steam valve body shown in FIG. 1;

FIG. 6 is a schematic cross-sectional view of the steam valve body shown in FIG. 1;

FIG. 7 is a schematic top view of the steam valve body shown in FIG. 1;

FIG. 8 is a partial view of the steam valve body shown in FIG. 1;

FIG. 9 is a perspective view of the backflow valve shown in FIG. 1;

FIG. 10 is a schematic cross-sectional view of a steam valve body with a return valve in an initial position;

fig. 11 is a schematic cross-sectional view of a steam valve body with a return valve in an active position.

Description of reference numerals:

10 cover 11 lining

12 faces cover 13 air outlet

14 steam channel wall 15 insulation

16 through hole 17 flanging

18 pot mouth sealing ring 100 steam valve

110 steam valve body 111 outer ring wall

112 outer extension wall 113 inner extension wall

114 upstream end 115 downstream end

116 extended end 117 bottom wall

118 boss 121 air inlet

122 reflow port 123 mounting hole

130 support part 131 first buckle

140 steam valve sealing ring 141 upper groove

142 lower groove 143 second catch

150 reflux valve 151 baffle

152 positioning part 153 limiting part

161 return inclined wall 162 horizontal bottom wall

163 limit wall

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.

In the following description, a detailed description will be given in order to thoroughly understand the present invention. It is apparent that the implementation of the embodiments of the utility model is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

It is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for purposes of illustration only and are not limiting.

Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.

The present invention provides a cooking appliance comprising a pot body and a lid 10 (as shown in fig. 1). The pot body has a cylindrical inner pot accommodating portion. The inner pot can be fixedly arranged at the inner pot containing part, or can be freely put into the inner pot containing part or taken out from the inner pot containing part, so that the inner pot can be conveniently cleaned. The inner pot is generally made of a metal material and has a circular opening on an upper surface for containing a material to be heated, such as rice, soup, etc. The cooker body comprises a heating device for heating the inner pot, such as a heating plate, so as to heat the inner pot.

It is understood that the cooking appliance according to the present invention may be an electric rice cooker, an electric pressure cooker or other cooking appliances, and the cooking appliance may have various functions such as cooking porridge, etc. in addition to the function of cooking rice.

The lid body 10 has a shape substantially corresponding to the pot body. The lid body 10 is openably and closably provided on the pot body, and specifically, it is pivotally connected to the pot body by a pivot shaft, and can be freely pivoted about the pivot axis where the pivot shaft is located between a closed position and an open position with respect to the pot body, so as to facilitate the closing and opening of the pot body. When the cover 10 is closed on the cooker body, it covers the inner pot and forms a cooking space with the inner pot. The lid body 10 also typically has a rim seal 18 (fig. 1), which rim seal 18 may be made of, for example, a rubber material, disposed between the lid body 10 and the inner pan for sealing the cooking space when the lid body 10 is in the closed position.

As shown in fig. 1 and 2, the cover body 10 may include a liner 11, a cover 12 positioned above the liner 11, and a heat insulating member 15 positioned below the liner 11. The face cover 12 can cover the liner 11, and the face cover 12 can be mounted to the liner 11 by snapping, fastening with fasteners such as screws, plugging, or any other suitable means. Similarly, insulation 15 may be attached to liner 11 by snapping, fastening with fasteners such as screws, plugging, or any other suitable means.

It should be noted that directional terms used herein to describe various components, portions, etc. of the cover 10, such as "upper," "lower," "above," "below," "upward," "downward," etc., are relative to the cover 10 when it is in a horizontally disposed and closed position.

In the illustrated embodiment, the face cover 12 is configured as a cover body having a receiving space in which a portion of the liner 11 is located. The periphery of the face cover 12 is engaged with the liner 11. The heat insulating member 15 is configured in a plate shape. The periphery of the heat preservation piece 15 is provided with a clamping pin, correspondingly, the lining 11 is provided with a jack corresponding to the position of the clamping pin. The clamping pin penetrates through the insertion hole and then is bent so as to fix the heat preservation piece 15. The pot mouth sealing ring 18 is arranged on the heat preservation piece 15.

The cover 10 may further include a steam valve 100. A steam passage is provided in the steam valve 100. The face cover 12 may be provided with an air outlet 13 communicating with the steam valve 100. The steam flowing in the steam valve 100 can be discharged to the external environment through the air outlet 13. The steam valve 100 includes a steam valve body 110, a steam valve packing 140, and a return valve 150. The steam valve main body 110 can be installed in the cover 10 by the steam valve packing 140. The backflow valve 150 is disposed at the bottom of the steam valve body 110, and can control backflow of the liquid in the steam valve 100, specifically, backflow into the inner pot.

Specifically, as shown in fig. 3, steam valve body 110 may be coupled, e.g., snapped, to steam valve seal 140. As shown in fig. 4, the face cover 12 may be provided with a downwardly extending steam channel wall 14, and the steam channel wall 14 may enclose an annular area. The air outlet 13 is located in an annular region enclosed by the wall 14 of the steam channel. The steam channel wall 14 forms an upper part of the steam channel and the steam valve body 110 forms a lower part of the steam channel. The thermal insulation 15 may be provided with a through hole 16. A portion of the steam valve 100 is located in the through hole 16, and particularly, a portion of the steam valve sealing ring 140 is located in the through hole 16. A steam valve sealing ring 140 is located between the steam channel wall 14 and the insulation 15. In the illustrated embodiment, the steam valve sealing ring 140 may be sandwiched between the steam channel wall 14 and the insulating member 15. Steam valve seal 140 is provided with an upper notch 141 facing upwardly and a lower notch 142 facing downwardly. The steam channel wall 14 can be located in the upper groove 141. The thermal insulation member 15 may be provided with an upward turned-over edge 17 at the through hole 16. The cuff 17 can be located in the lower groove 142. Thus, by means of the upper groove 141 and the lower groove 142, the steam valve sealing ring 140 is fixed.

The steam valve 100 of the present invention will be described in detail with reference to fig. 3, 5 to 9.

As shown in fig. 5 and 6, the steam valve body 110 can be configured such that the steam valve body 110 includes an outer annular wall 111, an outer extended wall 112, and an inner extended wall 113. It is understood that the outer annular wall 111 is a wall body having an annular shape, particularly a wall body having an annular shape around the circumferential direction of the steam valve 100; the outer extension wall 112 may be a straight wall, i.e. a wall having a flat plate shape, and the inner extension wall 113 may similarly be a straight wall, i.e. a wall having a flat plate shape, i.e. the outer extension wall 112 and the inner extension wall 113 are flat as a whole in the circumferential direction of the steam valve 100. The outer annular wall 111 can have an upstream end 114 and a downstream end 115. It will be appreciated that the downstream end 115 is downstream of the upstream end 114. The upstream end 114 can be spaced from the downstream end 115 in a circumferential direction of the steam valve 100, that is, the outer annular wall 111 is shaped as an open ring.

An outer extended wall 112 can be connected to the upstream end 114, and the outer extended wall 112 and the outer annular wall 111 form an outer wall of the steam valve main body 110. The inner extension wall 113 can be connected to the downstream end 115. And at least a portion of the inner extension wall 113 is located inside the outer extension wall 112 in the radial direction of the steam valve 100, and a portion of the inner extension wall 113 constitutes an inner wall body of the steam valve main body 110. The inner extending wall 113 and the outer extending wall 112 are located on the same side of the center of the steam valve body 110. The extension end 116 of the inner extension wall 113 can have an end surface F. Further, the extended end 116 of the inner extension wall 113 is not connected to other portions in the horizontal direction.

Wherein the outer extension wall 112 and the inner extension wall 113 define a bubble breaking channel G1 therebetween. The air inlet end of the bubble breaking channel G1, which is remote from the upstream end, can be provided with at least one air inlet 121, the outlet of the bubble breaking channel G1 being formed at the extended end 116 of the inner extending wall 113. Vapor entrained with the bubbles can enter the bubble breaking channel G1 from the gas inlet 121.

In this embodiment, by providing additional bubble breaking channels G1 within the steam valve body 110, steam may be directed more centrally and in a more orderly manner. The bubble-breaking passage G1 forms an open outlet at the extended end of the inner extended wall 113, and the steam can be rapidly expanded while changing the speed and pressure of the steam by flowing through the extended end of the inner extended wall 113, and the bubbles can be rapidly broken by the influence of the speed and pressure change.

The cross-sectional area of the at least one air inlet 121 may be smaller than the smallest cross-sectional area of the bubble-breaking channel G1 except at the air inlet 121. It is understood that when two or more of the gas inlets 121 are provided, the sectional area refers to the total sectional area of the two or more gas inlets 121.

In this embodiment, by changing the size relationship of the air inlet 121 and the bubble-breaking channel G1, and changing the velocity and pressure of the steam, the bubbles can be broken quickly by the influence of the velocity and pressure changes. Specifically, the steam accelerates to flow at the air inlet 121, and the pressure of the steam rapidly decreases when flowing out of the air inlet 121, the steam rapidly expands, causing the bubbles to rapidly collapse, enabling more effective bubble breaking.

Therefore, compared with a mode of increasing the volume and the length of the channel, the steam valve 100 of the embodiment has an excellent bubble breaking effect and a quick pressure reduction effect, so that an anti-overflow effect can be improved, and the use experience of consumers is improved; and the structure of the steam valve 100 can be simplified, the production and manufacture of the steam valve 100 are facilitated, and the miniaturization of the steam valve 100 is facilitated.

Steam valve body 110 also includes a bottom wall 117. The bottom wall 117 can be connected to both the outer extending wall 112 and the inner extending wall 113, the bottom wall 117, the outer extending wall 112 and the inner extending wall 113 defining a bubble-breaking channel. The outer extension wall 112 can abut against the lower surface of the thermal insulating member 15. Thus, the steam valve body 110 may form the open-topped and closed-bottomed bubble breaking channel G1, and a portion of the lower surface of the heat insulating member 15 forms the top surface of the bubble breaking channel G1, that is, the heat insulating member 15 is located at the upper end of the steam valve body 110, and a portion of the heat insulating member 15 and the steam valve body 110 enclose the bubble breaking channel G1. The liquid of vapor formed by the breaking of the bubbles can pool on the upper surface of the bottom wall 117; and the formed bubble breaking channel G1 has simple structure, can simplify the structure of the steam valve 100 and is convenient for production and manufacture.

The outer annular wall 111, the inner extending wall 113, and the bottom wall 117 define the backflow chamber G2 such that the backflow chamber G2 formed may directly communicate with the bubble breaking channel G1. The bottom wall 117 of the return chamber G2 may be provided with a return port 122. The outer annular wall 111 can abut against the lower surface of the heat retainer 15. Thus, the steam valve body 110 may form an open-topped, closed-bottomed return chamber G2, and a portion of the lower surface of the heat retainer 15 forms the top surface of the return chamber G2, that is, a portion of the heat retainer 15 encloses the return chamber G2 with the steam valve body 110. The separated liquid can pool on the upper surface of the bottom wall 117 and flow out of the return port 122. The larger size of the return chamber G2 facilitates the rapid expansion of the bubbles at the extended end 116 of the inner extension wall 113 and the rapid reduction in vapor pressure. The steam flowing out of the bubble breaking channel G1 enters the return cavity G2, gas-liquid separation is carried out in the return cavity G2, and the separated liquid flows out of the return opening 122, specifically flows out of the inner pot. Because the return cavity G2 has annular outer rampart 111 for steam can flow along the circumferential direction, so that steam carries out gas-liquid separation under the effect of centrifugal force, and the separation is effectual and efficient.

Further, in one example, the inner extension wall 113 may all abut the insulating member 15. This results in the insulating element 15 forming the top of the bubble-breaking channel, a portion of the insulating element 15, the inner extension wall 113, the bottom wall between the inner extension wall 113 and the outer extension wall 114, and the outer extension wall 114 enclosing the bubble-breaking channel spaced around, and steam can only enter the bubble-breaking channel from the air inlet.

In another example, steam valve seal ring 140 may have an annular wall with a portion located within throughbore 16. The inner extension wall 113 may all abut the annular wall. Or the inner extension wall 113 may abut both the annular wall and the insulating member 15. This results in the insulating member 15 and the steam valve sealing ring 140 forming the top of the bubble-breaking channel, a portion of the insulating member 15, a portion of the steam valve sealing ring 140, the inner extension wall 113, the bottom wall between the inner extension wall 113 and the outer extension wall 114, and the outer extension wall 114 enclosing the bubble-breaking channel spaced around, and steam can only enter the bubble-breaking channel from the air inlet.

The inner surface of the outer extension wall 112 and the outer surface of the inner extension wall 113 face each other and are both planar. There is no structure for blocking the steam from entering the outer extension wall 112 and the inner extension wall 113, and the steam can enter the bubble breaking channel G1 without blocking and can circulate in the bubble breaking channel G1 without blocking, so as to prevent the excessive accumulation of steam and liquid in the bubble breaking channel G1, thereby ensuring that the speed and pressure of the steam are not affected, and obtaining better bubble breaking effect.

As shown in fig. 7, the outer extension wall 112 may extend from the upstream end 114 in a tangential direction of the outer annular wall 111. I.e., the outer extending wall 112 is parallel to the tangential direction at the upstream end 114. Or more specifically, the inner surface of the outer extension wall 112 is tangent to the inner surface of the outer annular wall 111. As shown by the flow line with the arrow in fig. 7, the steam in the bubble breaking channel G1 can enter the return cavity G2 along the direction parallel to the tangential direction, and when the steam leaves the bubble breaking channel G1, the extension end 116 of the inner extension wall 113 is easy to expand and break, and the steam enters the return cavity G2 along the direction parallel to the tangential direction, so that the steam can smoothly enter the position and enter at a higher speed, more liquid can be taken away, and excessive liquid is prevented from being accumulated, thereby obtaining a better bubble breaking effect.

The air inlet 121 may be perpendicular to the outer extension wall 112. Therefore, steam can enter the bubble breaking channel G1 along the direction parallel to the outer extension wall 112, the influence of the change of the flow direction when the steam enters on the bubble breaking is avoided, and the bubble breaking effect at the air inlet 121 can be improved.

In the illustrated embodiment, the bottom wall 117 is provided with an upwardly projecting boss 118. The boss 118 can connect the outer extension wall 112 and the inner extension wall 113. The three of the outer extending wall 112, the inner extending wall 113 and the boss 118 of the bottom wall 117 may form an air inlet 121 at the air inlet end. The bottom surface of the gas inlet 121 may be higher than the upper surface of the bottom wall 117 of the bubble-breaking channel G1. In this embodiment, the sectional area of the gas inlet 121 can be smaller than the minimum sectional area of the bubble breaking channel G1 except at the gas inlet 121.

In an embodiment not shown, three of the outer extending wall 112, the inner extending wall 113 and the bottom wall 117 may form an air inlet 121 at the air inlet end. The bottom surface of the air inlet 121 may be flush with the upper surface of the bottom wall 117 of the bubble-breaking channel G1. In this embodiment, the sectional area of the gas inlet 121 is equal to the smallest sectional area of the bubble breaking channel G1 excluding the gas inlet 121.

According to the two embodiments provided with one air inlet 121, the bottom wall 117 of the bubble breaking channel G1 is lower than or flush with the bottom surface of the air inlet 121, so that the bottom surface of the bubble breaking channel G1 has no structure for blocking the steam from entering, the steam can more smoothly and quickly pass through the bubble breaking channel G1, and excessive steam and liquid are prevented from accumulating in the bubble breaking channel G1, so that the speed and pressure of the steam are not affected, and a better bubble breaking effect is obtained.

Optionally, the bottom surface of the gas inlet 121 is planar. Therefore, no structure for blocking the steam from entering is arranged on the bottom surface of the air inlet 121, and the steam can enter the bubble breaking channel G1 uniformly at the air inlet 121, so that the speed of the steam is not affected, and a better bubble breaking effect is obtained.

In the illustrated embodiment, the outer extension wall 112 may be parallel to the inner extension wall 113. Therefore, the bubble breaking channel G1 with a constant sectional area can be formed, and steam flows uniformly in the bubble breaking channel G1, so that the speed of the steam is not influenced, and a better bubble breaking effect is obtained. The steam valve 100 of this embodiment has a neat and simple structure, and is convenient to manufacture.

In an embodiment not shown, the inner extension wall 113 may be inclined toward the side of the center line of the outer annular wall 111 with respect to the outer extension wall 112. That is, the inner extension wall 113 is disposed at an angle to the outer extension wall 112. Here, the center line of the outer annular wall 111, that is, the axial center line of the outer annular wall 111, in the illustrated embodiment, the center line of the outer annular wall 111 is collinear with the center of the steam valve body 110, and the inner extension wall 113 may be inclined toward the side of the center of the steam valve body 110 with respect to the outer extension wall 112. Accordingly, the sectional area of the formed bubble breaking passage G1 gradually increases in a direction away from the air inlet 121, and the steam gradually expands in the bubble breaking passage G1 and rapidly expands away from the bubble breaking passage G1 to break the bubble.

The side of the extended end 116 of the inner extended wall 113 near the outer extended wall 112 may be provided with a flow guide surface F1, the flow guide surface F1 being inclined or curved. By means of the deflector surface F1, rapid expansion of the steam at the extension end 116 of the inner extension wall 113 is facilitated, which increases the diffusion efficiency and accelerates the breaking of the bubbles. In the illustrated embodiment, the deflector surface F1 is a circular arc, and in particular, the extension end 116 may be configured in a semi-cylindrical shape and the deflector surface F1 is a semi-cylindrical surface.

The outer extension wall 112 has a connection point with the outer annular wall 111. The portion of the inner extension wall 113 excluding the flow guide surface F1 may not exceed a straight line Li (see fig. 7) from the connection point to the center line of the outer annular wall 111. The connection point is here understood to be the connection location, the straight line Li being the reference line in the design process. Thereby, the extended position of the inner extension wall 113 and thus the extended length of the bubble breaking channel G1 is determined, which facilitates the manufacturing.

As shown in fig. 8, the extended length L of the bubble-breaking channel G1 is greater than or equal to 5 mm. For example, the extension length L may be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, or the like. The minimum distance D between the outer extension wall 112 and the inner extension wall 113 may be less than or equal to 2mm to 10 mm. For example, the minimum distance D may be 2mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and the like.

Referring back to fig. 3 and 5, a support 130 may be disposed within the backflow chamber G2. The support 130 extends upwardly from the bottom wall 117 of the return chamber G2. The top of support 130 can be connected to the inside of steam valve seal 140.

The supporting portions 130 may be provided at least two at intervals. The steam can be circulated between the at least two supporting parts 130, which is beneficial to breaking bubbles and refluxing; such an arrangement may further increase the spatial size of return chamber G2. In the illustrated embodiment, two support portions 130 are provided, and the two support portions 130 are disposed to face each other. The top of support 130 may be connected to steam valve sealing ring 140 by a snap fit structure. The top of the support 130 is provided with a first buckle 131, and the first buckle 131 is located on one side of the support 130 facing away from the center line of the steam valve main body 110. The first latch 131 may protrude from the surface of the supporting portion 130. The steam valve sealing ring 140 is provided with a second catch 143, and the second catch 143 is located at an inner surface facing the center of the steam valve sealing ring 140. The second latch 143 may protrude from an inner surface of the steam valve sealing ring 140. The second catch 143 may be shaped as a ring. The first catch 131 can be snapped to the second catch 143.

The extension end 116 of the inner extension wall 113 may be spaced apart from the support portion 130 in the circumferential direction. Therefore, the supporting portions 130 are far from the extending ends 116, the steam flowing out of the bubble breaking channel G1 can flow into the area where the center line of the steam valve main body 110 is located from the space between the adjacent supporting portions 130, and the supporting portions 130 do not affect the rapid expansion of the steam at the extending ends 116 of the inner extending walls 113, so that the bubble breaking effect and the rapid pressure reduction effect are ensured.

The support 130 is configured in a circular arc shape, and the support 130 may be concentric with the outer annular wall 111. That is, the support portion 130 extends in the circumferential direction with respect to the center line of the outer annular wall 111. Such a portion of the steam may flow in a circumferential direction between the support 130 and the outer annular wall 111 to achieve gas-liquid separation of the steam by means of centrifugal motion. The total size of the support portions 130 in the circumferential direction may be less than or equal to 40% of the circumference of the circle on which the support portions 130 are located. The total size of the support 130 in the circumferential direction may be 40%, 35%, 30%, 25%, 20%, etc. of the circumference of the circle on which the support 130 is located. Therefore, the reflux cavity G2 has a larger space, which is beneficial to improving the effect of gas-liquid separation, and the installation stability of the steam valve main body 110 can be ensured. The dimension of the first catch 131 in the circumferential direction is equal to or less than 50%, 45%, 40%, 35%, 30%, etc. of the dimension of the support 130 in the circumferential direction. Therefore, the installation stability of the steam valve main body 110 can be ensured, and the steam valve main body can be conveniently disassembled and assembled.

In an embodiment not shown, the inner extension wall 113 may be a segment of an annular wall, i.e., an inner annular wall. In this embodiment, the inner annular wall does not extend beyond the line Li from the point of connection to the centerline of the outer annular wall 111. The centerline of the inner annular wall may be collinear with the centerline of the outer annular wall 111.

As shown in fig. 9, the backflow valve 150 may include a stopper 151, a positioning portion 152, and a stopper 153. The blocking plate 151 is located below the positioning portion 152 and connected to the positioning portion 152. The stopper 153 is connected to the top of the positioning part 152. Steam valve body 110 is provided with mounting hole 123, and specifically bottom wall 117 is provided with mounting hole 123. The positioning portion 152 is disposed in the mounting hole 123, and the blocking sheet 151 is located below the reflow opening 122 to cover the reflow opening 122.

The periphery of the stopper 153 can protrude from the circumferential surface of the positioning portion 152, and the periphery of the stopper 153 abuts against the upper surface of the bottom wall 117 at the hole edge of the mounting hole 123. Therefore, the reflux valve 150 can be clamped to the steam valve main body 110, and the reflux valve 150 is convenient to mount and dismount.

The positioning portion 152 may be rod-shaped, for example, the positioning portion 152 is a cylindrical rod. The stopper 153 may be tapered, for example, conical. The tapered surface of the stopper 153 serves as a guide surface, and thus, the stopper 153 can be easily and accurately and quickly inserted into the mounting hole 123, and the positioning portion 152 can be positioned in the mounting hole 123.

The bottom wall 117 may include a return sloped wall 161 and a horizontal bottom wall 162. The horizontal bottom wall 162 is located inside the return inclined wall 161, and further, the return inclined wall 161 is located between the outer annular wall 111 and the horizontal bottom wall 162. The return sloped wall 161 can be disposed around the outer annular wall 111, forming an annular return sloped wall 161. The illustrated embodiment shows the horizontal bottom wall 162 as being circular in shape and the outer annular wall 111 as being circular in shape, with the center line of the outer annular wall 111 being collinear with the center of the horizontal bottom wall 162. Whereby the return inclined wall 161 is circular in shape.

The return inclined wall 161 extends obliquely downward from the outer annular wall 111 to the horizontal bottom wall 162. The backflow inclined wall 161 may be connected to a lower end of the outer annular wall 111 and to a peripheral edge of the horizontal bottom wall 162. The return opening 122 and the mounting hole 123 are both disposed in the horizontal bottom wall 162. With the backflow inclined wall 161, the liquid separated by the centrifugal force generated by the outer annular wall 111 can rapidly flow from the outer annular wall 111 to the backflow port 122 of the horizontal bottom wall 162 along the backflow inclined wall 161, and even in the case where a large amount of liquid is separated, the phenomenon of liquid accumulation does not occur, thereby ensuring the effect of gas-liquid separation, improving the backflow efficiency of the steam valve 100, and further avoiding the occurrence of the overflow phenomenon.

The return inclined wall 161 may also be disposed between the outer extension wall 112 and the inner extension wall 113, and the return inclined wall 161 extends obliquely downward from the outer extension wall 112 to the inner extension wall 113. The return inclined wall 161 may be connected to the straight lower end of the outer ring and to the lower end of the inner extension wall 113. Therefore, liquid in the bubble breaking channel G1 can be quickly gathered, the gathered liquid flows out of the bubble breaking channel G1 to the backflow cavity G2, and liquid accumulation in the bubble breaking channel G1 is avoided.

The inclination angle β of the backflow inclined wall 161 may range from 8 ° ≦ β ≦ 45 °, for example, the inclination angle β may be 8 °, 10 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, and the like. Specifically, the inclined angle β is the angle between the horizontal plane in which the return inclined wall 161 and the bottom wall 117 are located. The backflow inclined wall 161 having an inclination angle within the above range not only enables the liquid to flow downward rapidly, but also ensures the gas-liquid separation effect.

As shown in fig. 10 and 11, the return valve 150 is movably, in particular rotatably, arranged with respect to the return port 122. Specifically, the center of the positioning portion 152 can be spaced apart from the center of gravity of the flap 151. The flap 151 is movably disposed between an initial position (fig. 10) inclined downward relative to the return port 122 and an active position (fig. 11). Wherein, the inclination of the blocking piece 151 at the active position is greater than that of the blocking piece 151 at the initial position. The initial position is the position that the flap 151 naturally assumes after the reflux valve 150 is installed to the steam valve body 110. Since the center of gravity of the flap 151 is deviated from the installation position of the return valve 150, the flap 151 is inclined downward with respect to the return port 122 with the installation position as a base point by its own weight. The active position is a position that is at a different slope than the initial position, and the flap 151 is further tilted downward from the initial position relative to the return port 122 by the force of gravity of the liquid in the vapor valve 100.

It will be appreciated that the active position is not a fixed position, and that a plurality of active positions may be formed by varying the degree of rotation of the blocking plate 151. Wherein the plurality of active positions includes a position having a maximum slope. When the blocking piece 151 is in the maximum slope active position, the blocking piece 151 can abut against the bottom wall 117 to keep the blocking piece 151 in the active position. Specifically, the edge of the blocking piece 151 on the side where the positioning portion 152 is located can abut against the lower surface of the bottom wall 117, and the edge of the limiting portion 153 close to the center of gravity of the blocking piece 151 can abut against the upper surface of the bottom wall 117.

In this embodiment, since the center of the positioning portion 152 is spaced apart from the center of gravity of the blocking plate 151, the blocking plate 151 may be kept inclined by its own weight, so that a small gap is formed between the blocking plate 151 and the backflow port 122, and the backflow valve 150 is kept in an open state at an initial position. Therefore, the liquid can be discharged when the liquid at the return opening 122 is less, and the liquid discharging effect of the return valve 150 of the scheme is better compared with that of a conventional return valve.

Since the flap 151 can move between the initial position of inclination and the active position, which is a different position having a larger inclination than the initial position, the flap 151 can automatically incline downward from the initial position under the action of the gravity of a certain amount of liquid, and move to the active position, so that the gap between the flap 151 and the return opening 122 is increased, and at this time, the return valve 150 is kept in the open state at the active position having a larger inclination. Thus, when there is liquid accumulation in the return port 122, a large amount of liquid can easily flow out of the steam valve 100 through a large gap, and the throughput of the return valve 150 is increased, thereby improving the liquid discharge effect of the return valve 150. When there is little or no liquid, the flap 151 automatically rebounds to return to the initial position.

The reflux valve 150 provided by the utility model can be always kept in a normally open state and has two working states with different opening degrees. When the cooking appliance is in operation, the return valve 150 can be switched between two operating states to controllably drain the liquid based on the amount of liquid in the steam valve. Therefore, the liquid can quickly flow back, secondary bubbles are prevented from being generated, the anti-overflow effect can be improved, the phenomenon of pot overflow is avoided, and the use experience of consumers is improved; and the structure of the steam valve 100 can be simplified, making the production and manufacture of the steam valve 100 easier.

The blocking piece 151 may be a silicone member. The flap 151 itself is deformable. When the hydrops of backward flow mouth 122 department is more, separation blade 151 can take place deformation under the hydrops effect, and this can further increase the clearance between separation blade 151 and the backward flow mouth 122. Therefore, the treatment capacity of the reflux valve 150 can be improved, and the liquid discharge effect is better. As an example, when the blocking piece 151 is in the maximum slope active position, the blocking piece 151 may be deformed by the liquid loading, and at this time, the gap between the deformed blocking piece 151 and the return opening 122 is larger than that of the blocking piece 151 in the maximum slope active position, so that more liquid can be discharged.

The inclination angle α of the blocking piece 151 located at the movable position may range from α ≦ 10 °, for example, the inclination angle α may be 10 °, 9 °, 8 °, 7 °, 6 °, 5 °, and the like. Specifically, the inclination angle α is an included angle between the blocking piece 151 located at the movable position and a horizontal plane where the bottom wall 117 is located. The blocking piece 151 can be inclined to be less than or equal to 10 degrees, so that not only can the liquid flow downwards rapidly along the upper surface of the blocking piece 151, but also bubbles in the steam can be prevented from entering the steam valve 100 from a gap between the blocking piece 151 and the bottom wall 117.

The bottom wall 117, in particular the horizontal bottom wall 162, may be provided with a downwardly extending annular stop wall 163, the flap 151 being located within the stop wall 163. By means of the annular limiting wall 163, the movement of the blocking piece 151 in the horizontal direction can be limited, so that the backflow valve 150 can be kept stable in the working process, the shaking except the up-and-down tilting action is avoided, and the working performance of the backflow valve 150 is improved.

Referring back to fig. 7, the return port 122 may be located on the side of the center of gravity of the flap 151 with respect to the mounting hole 123. The center of the return port 122 may be located on the side opposite to the side where the mounting hole 123 is located with respect to the center of gravity of the baffle plate 151. Therefore, the gravity of the liquid can better act on the baffle sheet 151 by arranging the position of the backflow port 122, the baffle sheet 151 can be inclined more greatly, and meanwhile, the center of the backflow port 122 can be closer to a gap formed between the inclined baffle sheet 151 and the bottom wall 117 so as to drain liquid better.

Alternatively, the center of gravity of the blocking piece 151 may coincide with the center of the blocking piece 151. The flap 151 has a standard geometry for ease of manufacture and installation. The shape of the blocking piece 151 corresponds to the shape of the return opening 122, for example, the return opening 122 has any suitable shape such as a circle or a square, and the blocking piece 151 has any suitable shape such as a circle or a square. As an example, the blocking piece 151 is a circular blocking piece.

The flap 151 in the initial position may have a spacing d1 from the bottom wall 117. d1 is 0.5mm or more, for example, the distance d1 may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or the like. The blocking piece 151 has a gap from the bottom wall 117 in the initial position so that the blocking piece 151 is smoothly inclined downward. The flap 151 in the initial position has a spacing d2 from the stopper wall 163. d2 is 0.5mm or more, for example, the distance d2 may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. A gap is formed between the blocking piece 151 and the bottom wall 117 when the blocking piece 151 is in the initial position, so that the blocking piece 151 can move smoothly between the initial position and the movable position without interference.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the utility model to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A steam valve for a cooking appliance, characterized in that the steam valve (100) comprises:

a steam valve body (110), the steam valve body (110) comprising a bottom wall (117) provided with a return port (122) and a mounting hole (123); and

a reflux valve (150) which comprises a baffle plate (151) and a positioning part (152), wherein the baffle plate is positioned below the positioning part and connected with the positioning part, the positioning part is arranged in the mounting hole, the baffle plate is positioned below the reflux opening to cover the reflux opening,

wherein the center of the positioning portion (152) is spaced apart from the center of gravity of the flap, the flap is movably disposed between an initial position inclined downward with respect to the return port and an active position, and the inclination of the flap at the active position is greater than the inclination of the flap at the initial position.

2. The steam valve of claim 1, wherein the return port is located on a side of the center of gravity of the flap relative to the mounting hole, and/or a center of the return port is located on an opposite side of the center of gravity of the flap relative to the mounting hole.

3. The steam valve of claim 1, wherein the center of gravity of the flap coincides with a center of the flap, and/or the flap is a circular flap.

4. The steam valve of claim 1, wherein the bottom wall is provided with a downwardly extending annular stop wall (163), the flap being located within the stop wall.

5. The steam valve as claimed in claim 4, wherein the flap in the initial position has a minimum distance d1 from the bottom wall, and the flap in the initial position has a minimum distance d2 between the side of the positioning portion and the limiting wall, wherein d1 is 0.5mm or more, and d2 is 0.5mm or more.

6. The steam valve as recited in claim 1, wherein the angle of inclination α of the flap in the active position is in the range α ≦ 10 ° and/or the flap is a silicone piece.

7. The steam valve of claim 1, further comprising a limiting portion (153) connected to the top of the positioning portion, wherein a periphery of the limiting portion protrudes from a peripheral side surface of the positioning portion, and wherein the periphery of the limiting portion abuts against an upper surface of the bottom wall.

8. The steam valve of claim 7, wherein the positioning portion is rod-shaped and the limiting portion is tapered.

9. The steam valve of any of claims 1 to 8, wherein the steam valve body further comprises:

an outer annular wall (111) having an upstream end (114) and a downstream end (115), the upstream end being spaced from the downstream end in a circumferential direction of the steam valve;

an outer extending wall (112) connected to the upstream end; and

an inner extension wall (113) connected to the downstream end and at least a portion of which is located inside the outer extension wall in a radial direction of the steam valve, the inner extension wall and the outer extension wall being located on a same side of a center of the steam valve body, an extension end (116) of the inner extension wall having an end surface (F),

wherein the outer extending wall, the inner extending wall and the bottom wall define a bubble breaking channel (G1) provided with at least one air inlet (121).

10. The steam valve of claim 9, wherein the outer annular wall, the inner extending wall and the bottom wall define a return chamber (G2), the bottom wall of the return chamber being provided with the return port.

11. The steam valve of claim 9, wherein the inner surface of the outer extending wall and the outer surface of the inner extending wall face each other and are both planar, and/or the at least one air inlet is located at an air inlet end of the bubble breaking channel distal from the upstream end.

12. The steam valve of claim 9, wherein an inner surface of the outer extended wall is tangent to an inner surface of the outer annular wall, the outer extended wall is parallel to the inner extended wall or the inner extended wall is inclined with respect to the outer extended wall toward a side of a center of the steam valve body.

13. The steam valve of claim 9, wherein the bottom wall includes a return sloped wall (161) disposed around the outer annular wall (111) and a horizontal bottom wall (162) located inside the return sloped wall and extending obliquely downward from the outer annular wall (111) to the horizontal bottom wall, the return port and the mounting hole are both disposed at the horizontal bottom wall, the return sloped wall (161) is disposed between the outer and inner extending walls, and the return sloped wall (161) extends obliquely downward from the outer extending wall (112) to the inner extending wall (113).

14. A steam valve according to claim 13, characterized in that the angle of inclination β of the return sloping wall (161) is in the range 8 ° ≦ β ≦ 45 °.

15. A cooking appliance, characterized by comprising a lid (10) and a pot body, the lid being openably and closably provided to the pot body, the lid comprising a steam valve according to any one of claims 1 to 14.

16. The cooking appliance of claim 15, wherein the cover includes a lid (12) and a heat retaining member (15) positioned below the lid, wherein a steam valve seal of the steam valve is sandwiched between the lid and the heat retaining member, wherein the heat retaining member (15) is provided with a through hole (16) at which the steam valve seal is disposed, wherein the steam valve body is also disposed at the through hole and wherein an outer annular wall and an outer extended wall of the steam valve body abut a lower surface of the heat retaining member.

17. The cooking appliance of claim 16,

the inner extension wall of the steam valve main body is completely abutted against the heat preservation part, or

The steam valve sealing ring is provided with an annular wall with a part positioned in the through hole, and the inner extension wall of the steam valve main body is completely abutted against the annular wall or is simultaneously abutted against the annular wall and the heat preservation piece.