CN110547657B

CN110547657B - Cooking utensil

Info

Publication number: CN110547657B
Application number: CN201810535066.9A
Authority: CN
Inventors: 朱泽春; 邹凌风; 李青松
Original assignee: Joyoung Co Ltd
Current assignee: Joyoung Co Ltd
Priority date: 2018-05-30
Filing date: 2018-05-30
Publication date: 2021-02-02
Anticipated expiration: 2038-05-30
Also published as: CN110547657A

Abstract

The invention proposes a cooking appliance comprising: the cooking body comprises a pot cover, a pot body and an inner container, wherein the inner container is arranged on the pot body, and the pot cover is covered on the pot body; the vacuumizing device is used for forming negative pressure in the cooking cavity between the pot cover and the inner container; the check valve comprises a valve core and a valve body, a first air chamber is arranged in the valve body, the valve core is arranged in the first air chamber, a steam outlet hole and a vent hole which are communicated with the first air chamber are arranged on the valve body, and the steam outlet hole is connected with a vacuumizing device; the valve core can self-adaptively open or close the vent hole by means of the elastic force of the valve core. Compared with the traditional one-way valve operated by a driving mechanism, the mechanical one-way valve has the advantages of lower cost and good reliability, is favorable for protecting the vacuum pump and keeps the service life of the vacuum pump.

Description

Cooking utensil

Technical Field

The invention relates to the technical field of cooking appliances, in particular to a cooking appliance capable of being vacuumized.

Background

At present, the rice cooker sold on the market has the defects that the colloid inside the rice grains is difficult to absorb water, the rice grains are hard inside and soft outside, the taste is poor, the rice grains are difficult to digest and absorb by human bodies, and the food in the rice cooker is easy to oxidize and deteriorate when the rice cooker is kept warm for a long time. In order to solve the defects that the colloid in the rice grains is difficult to absorb water in the cooking process of the rice of the current electric cooker and the food in the cooker is easy to oxidize and deteriorate during long-time heat preservation, a vacuum pump can be added in the electric cooker to discharge the air from the cooker to form the vacuum low-pressure electric cooker. When the inner container is in a vacuum low-pressure state, the outside can generate a pressure to be applied to the vacuum pump, the service life of the vacuum pump is influenced, and therefore the check valve is needed, and the service life of the vacuum pump is prolonged. The one-way valve is opened when the vacuum pump works and closed when the vacuum pump does not work, the opening and closing action of the existing one-way valve is realized by depending on a driving mechanism, such as a motor, an electromagnetic valve and the like, when the inner container is maintained in a vacuum low-pressure state, if the one-way valve is forcibly opened by the driving mechanism at the moment, the vacuum pump cannot achieve the capacity of maintaining the current vacuum degree in a short time, the risk of pressure loss in the inner container exists, meanwhile, the valve core of the one-way valve is subjected to larger acting force by the pressure difference between the inside and the outside, the service life of the one-way valve is influenced by forcibly opening the one-way valve, the driving mechanism is complex in; in addition, during the pumping process, soup, bubbles, food materials and the like in the inner container can easily enter the one-way valve, which reduces the service life of the driving mechanism and the vacuum pump.

Disclosure of Invention

The invention aims to provide a cooking appliance to solve the technical problem that a check valve in the prior art is opened and loses pressure.

To this end, the invention proposes a cooking appliance comprising: the cooking body comprises a pot cover, a pot body and an inner container, wherein the inner container is arranged on the pot body, and the pot cover is covered on the pot body; the vacuumizing device is used for forming negative pressure in the cooking cavity between the pot cover and the inner container; the check valve comprises a valve core and a valve body, a first air chamber is formed in the valve body, the valve core is arranged in the first air chamber, a steam outlet and a vent hole which are communicated with the first air chamber are formed in the valve body, and the steam outlet is connected with the vacuumizing device; the valve core comprises a valve rod and a spring, and the valve core can adaptively open or close the vent hole by means of the self elastic force.

Preferably, the end of the valve rod for opening or closing the vent hole is provided with a sealing element.

Preferably, the end portion includes a flange protruding from the valve stem, a lower end surface of the flange faces the vent hole, and an aperture area of the vent hole on a side of the flange is greater than or equal to an area of an upper end surface of the flange.

Preferably, the hole of the vent hole at one side of the flange is in an inverted cone shape or a cylindrical shape.

Preferably, a groove is formed in the valve body and used for arranging the flange, the groove is communicated with the vent hole, and the flange and the groove are sealed through a sealing piece.

Preferably, the depth of the groove is less than the thickness of the flange.

Preferably, the valve body comprises a valve cap and a valve seat, the valve cap is connected with the valve seat, and the vent hole is formed in the bottom of the valve seat.

Preferably, the valve further comprises a hook arranged on the valve cap and a buckle arranged on the valve seat, and the valve cap and the valve seat are buckled with each other.

Preferably, still include locate the holding ring on the valve cap with locate the constant head tank on the disk seat, the holding ring with the constant head tank cooperation is connected.

Preferably, the disk seat is equipped with the installation department, the installation department is used for fixed first sealing washer, be equipped with the second sealing washer between disk seat and the valve cap.

Compared with the prior art, the invention has the advantages that:

the one-way valve is not controlled by the driving mechanism any more, the vacuum pump is kept in a closed state under the action of the reset piece and the internal and external pressure difference within a short time when being started, and the one-way valve is opened when the vacuum pump has the capacity of overcoming the self elastic force of the valve core and the internal and external pressure difference, so that the pressure loss risk of the inner container is avoided, the safety coefficient of the cooking appliance in a vacuum low-pressure state is improved, and the injury to a user is avoided. Meanwhile, compared with the traditional one-way valve which acts through a driving mechanism, the mechanical one-way valve has the advantages of lower cost and good reliability, and is beneficial to protecting the vacuum pump and maintaining the service life of the vacuum pump.

Drawings

FIG. 1 is a schematic view of a cooking appliance according to an embodiment of the present invention;

FIG. 2 is a perspective view of a liner according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of the installation of a check valve according to an embodiment of the present invention;

FIG. 4 is an enlarged partial schematic view of a check valve according to an embodiment of the present invention in a closed position;

FIG. 5 is an enlarged partial schematic view of a check valve according to an embodiment of the present invention in an open state;

FIG. 6 is a schematic structural view of a bonnet in accordance with an embodiment of the invention;

FIG. 7 is a schematic perspective view of a valve cap according to an embodiment of the present invention;

FIG. 8 is a schematic illustration of the construction of a valve seat according to an embodiment of the present invention;

FIG. 9 is a schematic perspective view of a valve seat according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a first seal ring according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.

Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts, unless otherwise specified.

The embodiment provides a cooking appliance, which is used for cooking food materials and can be generally a pot type electric appliance, such as an electric cooker, an electric pressure cooker, a steam cooker and the like, as shown in fig. 1, a cooking main body of the pot type electric appliance comprises a pot cover 2, a pot body 1 and a liner 3, the liner 3 is arranged in the pot body 1, the pot cover 2 is covered on the pot body 1, and the pot cover 2 comprises a face cover 203, a liner 202 and an inner cover 201 which are sequentially arranged from top to bottom; as shown in fig. 2, in order to solve the defects that the colloid in the rice grains is difficult to absorb water during the cooking process of the rice of the current electric cooker and the food in the rice cooker is easy to oxidize and deteriorate during long-time heat preservation, a vacuum-pumping device is arranged on the inner liner 202 and used for forming negative pressure in the cooking cavity between the cooker cover 2 and the inner container 3, and the vacuum-pumping device is a vacuum pump 210.

Vacuum pump 210 passes through the exhaust port that silicone tube 211 connects respectively on check valve and the inside lining 202, and when vacuum pump 210 during operation, the air in the inner bag 3 will be taken out fast, forms vacuum low pressure state, and when vacuum pump 210 stopped working, the check valve can prevent the inside and external intercommunication of inner bag 3, maintains the vacuum low pressure state in the inner bag 3. As shown in fig. 3, in this embodiment, a one-way valve is provided on the liner 202.

The vacuum low-pressure state of the inner container 3 has different functions in different cooking states, and in the reservation state, the state is favorable for storing food materials, keeping the freshness of the food materials, inhibiting bacteria and preventing decay, so that long-time reservation is realized, and the method has important significance for intelligent and automatic cooking appliances; in the water absorption state, the inner container 3 is vacuumized, air remained in the rice-water mixture is separated out to form bubbles with extremely tiny sizes, and the small bubbles blast the surfaces of the rice grains, so that the swelling of the surfaces of the rice grains is accelerated, and the water absorption process is promoted; under the boiling cooking state, the vacuum low pressure state will accelerate the boiling of liquid to realize the stirring effect to the edible material, improve culinary art quality, accelerate the culinary art speed.

In the cooking process, the water is heated and evaporated to increase the internal pressure of the inner container 3, so that the vacuum low-pressure state is lost, and therefore, it is necessary to restart the vacuum pump 210 for vacuum pumping to maintain the vacuum state inside the inner container 3, and in order to avoid further pressure loss when the check valve is opened, the check valve of the embodiment can be opened and closed in a self-adaptive manner according to the pressure difference between the inside of the inner container 3 and the outside, specifically as follows:

the one-way valve comprises a valve core and a valve body, a first air chamber 212 is formed in the valve body, the valve core is arranged in the first air chamber 212, a steam outlet 2062 and a vent 2053 which are communicated with the first air chamber 212 are formed in the valve body, and the steam outlet 2062 is connected with the vacuumizing device; the vacuum pumping device in this embodiment is a vacuum pump 210, and the valve core adaptively opens or closes the vent hole by means of its own elastic force.

In this embodiment, the valve core includes a valve rod and a reset member, and the valve rod adaptively opens or closes the vent hole by means of the reset member. One end of the valve core abuts against the bottom of the first air chamber 212, the other end abuts against the top of the first air chamber, and the valve core adaptively opens or closes the vent hole 2053 by means of the self elastic force. As shown in fig. 2, the restoring element is a spring 208, the spring 208 is sleeved on the valve rod 207, and the valve rod 207 adaptively opens or closes the vent hole 2053 by means of the spring 208.

In some flexible embodiments of this embodiment, reset the piece and can also be other setting forms, if set up the reed in first air chamber, torsional spring etc. when adopting the piece that resets of other forms, can not establish on the valve rod by the cover, the both ends of case also can not lean on bottom and the top at first air chamber, the case also can not set up the valve rod, if directly reset the piece setting and be used for leaning on the tip of air vent, the main part is for resetting the piece this moment, to sum up, the structure of case as long as can accomplish the self-adaptation of case and open or close can.

As shown in fig. 4, the state of the check valve is the state when no vacuum is pumped, and at this time, the valve rod 207 of the valve core abuts against the vent hole 2053 under the action of the spring 208, so that the vent hole 2053 is closed; as shown in fig. 5, when the vacuum pump 210 is actuated, the pressure difference between the inside and the outside overcomes the self-weight of the spring 208 and the valve stem 207, and moves upward against the valve stem 207, so as to open the vent hole 2053, and the gas in the inner container 3 will enter the first air chamber 212 through the vent hole 2053.

The one-way valve is of a mechanical action structure, the action of the valve rod 207 is self-adaptively opened or closed by the spring 208, and compared with the traditional one-way valve which acts through a driving mechanism, the one-way valve can ensure that the vacuum pump 210 is started firstly and the one-way valve is started later; the actions of the traditional one-way valve and the vacuum pump 210 are controlled by the same electric control signal, so that the vacuum pump 210 and the one-way valve are opened simultaneously, and the vacuum pump 210 cannot reach the capacity of maintaining the vacuum degree in the current inner container 3 in a short time, so that the inner container 3 has the risk of pressure loss; the check valve of this embodiment no longer receives actuating mechanism's control, and the short time that vacuum pump 210 started is under spring 208 and inside and outside differential pressure's effect, will maintain the closure state, and when vacuum pump 210 had possessed the ability of overcoming spring 208 and inside and outside differential pressure, the check valve just opened, and this decompression risk of having avoided inner bag 3 improves cooking utensil's factor of safety under the vacuum low pressure state, avoids causing the injury to the user.

Meanwhile, compared with the traditional one-way valve which acts through a driving mechanism, the mechanical one-way valve has the advantages of lower cost and good reliability, and is beneficial to protecting the vacuum pump and maintaining the service life of the vacuum pump.

As shown in fig. 6, a sealing member 2071 is disposed at an end of the valve rod 207 for opening or closing the vent hole 2053, the sealing member 2071 is made of silicon, and the shapes of the sealing member 2071 and the end can be various as long as the sealing member can seal the vent hole 2053; in this embodiment, the end portion includes a flange 2072 protruding from the valve rod 207, a lower end surface of the flange 2072 faces the vent hole 2053, and an aperture area of the vent hole 2053 on the flange 2072 side is equal to or larger than an area of an upper end surface of the flange 2072.

The flange 2072 can support the spring 208 and increase the force bearing area of the end; in this embodiment, one end of the spring 208 on the valve core abuts against the flange 2072, the other end of the spring 208 abuts against the valve body, the valve core can drive the spring 208 to compress during vacuum pumping, the vent hole 2053 is opened, the spring 208 can also abut against other positions on the flange 2072 instead of abutting against the flange 2072, under a vacuum low-pressure environment, the outside can generate a pressure to be applied to the upper end face of the flange 2072 of the valve rod 207, under a vacuum pumping state, the suction of the vacuum pump 210 can also generate a pressure to be applied to the lower end face of the flange 2072, when the aperture area of the vent hole 2053 on one side of the flange 2072 is larger than or equal to the area of the upper end face of the flange 2072, the resultant force of the three forces of the upper pressure, the spring 208 elasticity and the valve core gravity and the lower pressure can be balanced more quickly, the sensitivity of the valve core is.

The elastic force of the initial position of the spring 208 may be between 0.1N and 10N, and the elastic force of the initial position may be determined according to the elastic coefficient of the spring 208.

As shown in fig. 8, in order to make the force-bearing area of the lower end surface of the flange 2072 large enough, the vent 2055 of the vent 2053 of this embodiment, which is located on the side of the flange 2072, is in a shape of an inverted cone, or in some alternative embodiments, is in a shape of a cylinder, and the vent arranged in the shape of an inverted cone or a cylinder will be beneficial to increasing the force-bearing area of the lower end surface of the flange 2072, so that the valve core is more sensitive.

As shown in fig. 3 and 4, the valve body includes a bonnet 206 and a valve seat 205, the bonnet 206 is connected with the valve seat 205, the vent hole 2053 is opened at the bottom of the valve seat 205, the arrangement of the bonnet 206 and the valve body solves the installation problem of the valve core, a first air chamber 212 is left inside the valve core, the whole valve core is arranged inside the first air chamber 212 to satisfy the air tightness, the valve seat 205 and the bonnet 206 can solve the air tightness problem of the first air chamber 212, in order to solve the problem, as shown in fig. 4 and 6, a second sealing ring 209 is arranged between the bonnet 206 and the valve seat 205, the second sealing ring 209 is made of silica gel, and may be made of other materials, of; for better removal and attachment of the bonnet 206 to the valve seat 205, as shown in fig. 8 and 9, a retaining ring 2065 is provided on the bonnet 206 and a retaining groove 2054 is provided on the valve seat 205, the retaining ring 2065 being cooperatively engaged with the retaining groove 2054. As shown in fig. 6 and 7, the bonnet 206 is further provided with a hook 2061, the valve seat 205 is further provided with a buckle 2051, and the bonnet 206 is connected with the valve seat 205 in a buckling manner. The positioning of the bonnet 206 and the valve seat 205 can be rapidly realized through the positioning ring 2065 and the positioning groove 2054, and the hook 2061 and the buckle 2051 are accurately buckled together; a clearance 2052 is arranged below the buckle 2051, and when the clamping hook 2061 is buckled with the buckle 2051, the clamping hook 2061 can be matched with the clearance 2052.

As shown in fig. 7, the bonnet 206 is further provided with a mounting cross beam 2063, two fixing holes 2064 are provided at two ends of the mounting cross beam 2063, and after the bonnet 206 is fastened to the valve seat 205, as shown in fig. 4, the bonnet 206 can be fixed to the fixing post 2021 of the liner 202 by the mounting cross beam 2063, and the steam outlet 2062 is provided on the bonnet 206 and connected to the vacuum pump 210.

In some embodiments, in order to provide good sealing with the flange 2072, the vent holes 2053 disposed at the bottom of the valve seat 205 are further provided with grooves for providing the flange 2072, the grooves are communicated with the vent holes 2053, and the flange 2072 and the grooves are sealed by a sealing member 2071; with flange 2072 setting in the recess, only when the compression length of valve rod 207 exceeded the degree of depth of recess, flange 2072 could break away from the recess to open vent 2053, accomplish and bleed, consequently, set up like this and can increase the sealed effect of case and vent 2053, improve the reliability of case.

In the scheme of the flange 2072 in the groove, the vent 2053 may further be provided with an inverted conical orifice 2055 or a cylindrical orifice to increase the force-bearing area of the lower end surface of the flange 2072 in the groove, thereby improving the sensitivity of the valve core. Meanwhile, in order to improve the sensitivity of the valve core, the depth of the groove may be set to be smaller than the thickness of the flange 2072.

In addition, as shown in fig. 4, the second air chamber 213 is further provided in the embodiment, and the second air chamber 213 can prevent the soup, the bubbles, and the like from entering the vacuum pump 210, thereby prolonging the service life of the vacuum pump 210. Specifically, the second air chamber 213 is disposed at a lower side of the vent hole 2053, and communicates with the first air chamber 212 and the cooking cavity, for buffering air.

As shown in fig. 5, during air extraction, the gas needs to pass through the second air chamber 213 before entering the first air chamber 212, no valve core is arranged in the second air chamber 213, so that the gas entering the one-way valve can be buffered, and after the liquid in the inner container 3 enters the one-way valve, the liquid will not easily enter the first air chamber 212 due to the buffering of the second air chamber 213.

In this embodiment, a mounting hole is formed in the inner liner 202, an air inlet 2011 is formed in the inner cover 201, a first sealing ring 204 is arranged between the inner cover 201 and the inner liner 202, the check valve is arranged on the mounting hole, the second air chamber 213 is formed in the first sealing ring 204 between the inner cover 201 and the inner liner 202, and the air inlet 2011 is communicated with the cooking cavity.

The second air chamber 213 is disposed between the inner lid 201 and the liner 202, and the inner lid 201 is very convenient to disassemble, so that the second air chamber 213 can be cleaned conveniently by the above-mentioned arrangement method, and meanwhile, the liquid in the second air chamber 213 can be conveniently refluxed. When the inner container 3 is in a vacuum low-pressure state, the pressure difference between the inside and the outside will generate a pressure to be applied to the inner cover 201, the pressure will increase with the increase of the internal vacuum degree, and the area of the upper surface of the inner cover 201 is substantially equal to the cross-sectional area of the pot mouth of the inner container 3, so theoretically, when the internal vacuum degree reaches 60%, the force applied to the inner cover 201 is equal to an object of 100 plus 200Kg, therefore, the inner cover 201 will generate a larger deformation, based on which the second air chamber 213 is arranged between the inner cover 201 and the liner 202, the height of the second air chamber 213 will increase with the increase of the vacuum degree, and the buffer capacity of the second air chamber 213 will also increase.

As shown in fig. 4, an air inlet 2011 is formed at a position of the inner lid 201 corresponding to the second air chamber 213, and the air inlet 2011 and the air vent 2053 are axially offset, so that the distance of air flowing in the second air chamber 213 can be increased, and the buffering capacity of the second air chamber 213 can be improved. In some embodiments, a filter screen may also be provided at the air inlet 2011 to prevent solid particles from entering the second air chamber 213 and blocking the vent 2053.

The aperture of air vent 2053 is less than the aperture of air inlet 2011, and air inlet 2011 is less than the aperture of mounting hole, and specifically, the aperture size of air vent 2053 should set up a little bit, can make second air chamber 213 cushioning effect better from this.

The height of the second air chamber 213 is 2-15mm, which is the distance from the air inlet 2011 at the bottom to the vent 2053 at the top, and can be set according to practical situations, specifically, the height of the second air chamber 213 should be set to be a little higher, which will improve the buffering effect of the second air chamber 213.

As shown in fig. 10, the first sealing ring 204 includes a connecting portion 2041, the connecting portion 2041 extends downward to form a sealing ring main body 2042, a first lip 2044 and a second lip are disposed at the end of the sealing ring main body 2042, the connecting portion 2041 is disposed on the valve seat 205 and the liner 202, the first lip 2044 and the second lip 2043 abut against the inner lid 201 to achieve a sealing effect, one lip is used for sealing the first air chamber 212 with the outside during vacuum pumping, and the other lip is used for sealing after low pressure is formed inside the cooking cavity.

In some embodiments, the second air chamber 213 is not disposed between the liner 202 and the inner lid 201, but is disposed integrally with the check valve, and is directly formed on the check valve, referring to fig. 4, if the second air chamber 213 is directly formed on the check valve, the bottom of the valve seat 205 is disposed with a downwardly extending sidewall to form a cavity, at this time, the bottom of the valve seat 205 disposed with the vent hole 2053 is a partition plate, the upper side of the partition plate is the first air chamber 212, the lower side of the partition plate is the second air chamber 213, and the bottom of the second air chamber is disposed with an air inlet hole communicated with the cooking cavity; at this time, the height of the second air chamber 213 is not changed by the deformation of the inner lid 201, and therefore, an air passage may be formed on the sidewall or the bottom lid of the second air chamber 213 to prolong the flowing time of the air in the second air chamber 213, thereby improving the buffering effect.

In the description of the present invention, it is to be understood that the terms "center", "horizontal", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature.

While there has been described and illustrated what are considered to be example embodiments of the present invention, it will be understood by those skilled in the art that various changes and substitutions may be made therein without departing from the spirit of the invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the present invention without departing from the central concept described herein. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments and equivalents falling within the scope of the invention.

Claims

1. A cooking appliance, comprising:

the cooking body comprises a pot cover, a pot body and an inner container, wherein the inner container is arranged on the pot body, and the pot cover is covered on the pot body;

the vacuumizing device is used for forming negative pressure in the cooking cavity between the pot cover and the inner container;

the check valve comprises a valve core and a valve body, a first air chamber is formed in the valve body, the valve core is arranged in the first air chamber, a steam outlet and a vent hole which are communicated with the first air chamber are formed in the valve body, and the steam outlet is connected with the vacuumizing device;

the valve core acts on the vent hole by means of self elastic force, and the one-way valve closes the vent hole under the action of the elastic force when the vacuum pumping is not performed.

2. The cooking appliance according to claim 1, wherein the end of the valve core for opening or closing the vent hole is provided with a sealing member.

3. The cooking appliance of claim 2 wherein said end portion includes a flange projecting from said valve stem, said flange having a lower end surface facing said vent aperture, said vent aperture having an aperture area on a side of said flange equal to or greater than an area of an upper end surface of said flange.

4. The cooking appliance according to claim 3, wherein the vent hole has an inverted cone shape or a cylindrical shape at an opening thereof on a side of the flange.

5. The cooking appliance of claim 3 wherein said valve body defines a recess for receiving said flange, said recess communicating with said vent, said flange and said recess being sealed by a seal.

6. The cooking appliance of claim 5 wherein the depth of said recess is less than the thickness of said flange.

7. The cooking appliance of claim 1, wherein said valve body comprises a valve cap and a valve seat, said valve cap being connected to said valve seat, said vent opening in a bottom of said valve seat.

8. The cooking appliance according to claim 7, further comprising a hook provided on said bonnet and a catch provided on said valve seat, said bonnet and said valve seat being snap-fitted to each other.

9. The cooking appliance according to claim 7, further comprising a retaining ring disposed on said valve cap and a retaining groove disposed on said valve seat, said retaining ring being cooperatively engaged with said retaining groove.

10. The cooking appliance of claim 7, wherein the valve seat has a mounting portion for securing a first sealing ring, and a second sealing ring is disposed between the valve seat and the valve cap.