WO2017198231A1

WO2017198231A1 - Cooking pot

Info

Publication number: WO2017198231A1
Application number: PCT/CN2017/085203
Authority: WO
Inventors: 李康; 曹达华; 杨玲; 李洪伟; 李宁
Original assignee: 佛山市顺德区美的电热电器制造有限公司; 美的集团股份有限公司
Priority date: 2016-05-20
Filing date: 2017-05-19
Publication date: 2017-11-23

Abstract

A cooking pot, comprising: a pot body inner shell (10); a pot body outer shell (20) sleeved over the outside of the pot body inner shell (10), and being welded to the pot body inner shell (10) to form a sealed hollow cavity (30), the hollow cavity (30) being a vacuum cavity; and a liquid state phase change working medium, positioned at the bottom of the hollow cavity (30); the inner wall surface of the pot body inner shell (10) is not a non-stick coating.

Description

Cookware

Technical field

The invention relates to the technical field of household appliances, in particular to a pot.

Background technique

In the related art, in order to slow down the excessive heating of the food, the appearance of the paste pan is provided, and the inner wall of the cookware is provided with a non-stick coating, but the non-stick coating has poor bonding force, poor scratch resistance and long service life. Limited, so the coating is easy to fall off and fail, and is often scratched.

The pot that loses the non-stick coating will have a paste pot phenomenon, and at the same time, since the non-stick coating is easily mixed into the food and ingested by the human body, it poses a safety hazard to the health of the consumer.

Summary of the invention

The present invention aims to solve at least one of the above technical problems in the prior art to some extent. Accordingly, it is an object of the present invention to provide a pan that has a good physical non-sticking effect and does not pose a safety hazard to the user's health.

The pot according to the present invention comprises: a pot body shell; a pot body sleeve sleeved on an outer side of the inner pot shell, and welded to the inner pot shell to form a closed hollow body, the hollow body being a vacuum a cavity; a porous foam metal member disposed on an outer side wall of the inner body of the pan and/or an inner side wall of the outer casing of the pan, and having a flow guiding gap between the adjacent porous metal foam members; and a liquid phase a variable working medium located at a bottom position of the hollow cavity and capable of volatilizing and condensing along a hole in the porous metal foam member; wherein the inner wall surface of the inner body of the pan has no non-stick coating.

Preferably, a plurality of said porous foam metal members are radially distributed to form said flow guiding gap between adjacent said porous foam metal members.

The pot provided by the above embodiment of the present invention is an uncoated physical non-stick pan adopting a double-layer structure, and a hollow hollow body is formed between the inner pot shell of the pot and the outer shell of the pot body, and the hollow cavity is close to the body. The upper part is provided with a radially distributed porous metal foam member, such as a porous foam metal member bonded to the outer wall surface of the inner body of the pot body, and a liquid phase change working medium (such as water, is injected at a position near the bottom of the hollow cavity body). Ammonia or n-hexane, etc., so that the bottom of the pot is heated. When the temperature at the bottom of the pot is increased to a certain temperature (such as temperature >100 ° C), the liquid working medium near the bottom of the hollow cavity will vaporize and volatilize. It is a gas, and is transmitted along the flow guiding gap between two adjacent porous foam metal members to the condensing end of the hollow body near the upper portion, and at the same time, with the effective conduction of heat, the position of the open end of the pot is added. Heat, and the cooled phase change working fluid is condensed and re-converted into liquid. The liquid is adsorbed in the pores in the porous foam metal piece and flows under the action of gravity along the porous foam metal piece to the bottom of the hollow cavity body, and then After re-heating and then evaporating, the heating and condensing process is continuously circulated and reciprocated, thereby ensuring that the temperature field of each part of the whole cookware is kept consistent after heating for several minutes (if the temperature difference can be controlled at ±4 ° C), that is, the entire pot is ensured. The temperature is evenly distributed, and finally the surface of the pot has a good physical non-stick effect during cooking; and the above-mentioned pot does not need to spray fluororesin or the like on the surface of the pot, thereby effectively avoiding the cause The non-stick coating has poor wear resistance, unsatisfactory bonding force, short life, easy to fall off, affecting the non-stick effect and service life of the cooking utensils during cooking, and effectively avoiding the non-stick coating being absorbed by the human body. It poses a safety hazard to the user's health.

In addition, the pot provided by the above embodiment of the present invention further has the following additional technical features:

In the above technical solution, preferably, the pot body of the pot body is provided with an outwardly bent first annular flange, and the pot body of the pot body is provided with a second ring bent outward. Flanging, the first annular flange is hermetically connected to the second annular flange to form a sealed hollow cavity between the inner body casing and the pan outer casing.

Preferably, the first annular flange and the second annular flange are welded together.

Through the sealing connection of the first annular flange and the second annular flange, the first annular flange on the inner shell of the pot and the second annular flange on the outer shell of the pot are welded and sealed by a welding process to ensure complete welds. Sealed without gaps, preferably, the surface of the weld is polished after welding, and a closed hollow cavity is formed between the inner body of the pot and the outer shell of the pot.

In the above technical solution, preferably, a connecting port is formed at an upper position of the outer wall surface of the pot body, and the connecting port is provided with a metal tube in close communication with the hollow body, and the metal tube is used for The liquid phase change medium is injected into the bottom of the hollow body, and air in the hollow body is discharged through the metal tube.

Opening a joint (such as a small hole with a diameter of about 3 mm) at a position near the upper part of the pot body, and then inserting a metal tube of the same diameter (such as a metal hollow copper tube), and then welding the contact position of the metal tube to the wall of the pot Sealing, the metal tube and the hollow cavity are tightly connected to each other, so that the liquid phase change working medium is injected into the bottom of the hollow cavity through the metal tube, and the air in the hollow cavity is removed, so that the hollow body is kept in a vacuum state.

In the above technical solution, preferably, the degree of vacuum in the hollow cavity is 10 ^-3 Pa to 10 ^-1 Pa.

The degree of vacuum in the hollow cavity is controlled to be 10 ^-3 Pa to 10 ^-1 Pa, so as to reduce the phase transition temperature of the liquid phase change working medium, and facilitate the circulation vaporization and condensation of the liquid phase change working medium, thereby further ensuring the bottom and upper portions of the pot. The temperature uniformity ensures the temperature uniformity of all parts of the whole pot. Of course, the degree of vacuum in the hollow cavity is not limited to the above specific numerical range, and can be designed according to actual conditions.

In the above technical solution, preferably, the inner pot shell and the outer pot shell are stamped and formed by using a stainless steel plate or an aluminum alloy plate, and the stainless steel plate or the aluminum alloy plate has a thickness ranging from 0.6 mm to 2.5 mm. .

The stainless steel plate or the aluminum alloy plate is used to stamp and form the inner body shell and the outer shell of the pot body, thereby ensuring the forming effect of the pot and ensuring the thermal conductivity of the pot; using a stainless steel plate or an aluminum alloy plate having a thickness ranging from 0.6 mm to 2.5 mm. Both guarantee pots The strength ensures the thermal conductivity of the pan.

In the above technical solution, preferably, the hollow cavity has a width ranging from 1.5 mm to 4 mm; wherein the hollow cavity has a width of an outer wall surface of the inner body shell and an inner side wall surface of the pan outer casing The gap width formed between.

Preferably, the gap width between the outer side wall surface of the inner body shell of the pan and the inner side wall surface of the pan outer casing remains substantially uniform.

In the above technical solution, preferably, the thickness of the porous foam metal member is adapted to the width of the hollow cavity, and the porous foam metal member has an average pore diameter of 0.2 mm to 0.4 mm and a porosity of 70%. ~90%.

Of course, the average pore diameter and porosity of the above porous metal foam member are not limited to the above specific limits, and may be selected according to actual conditions; preferably, the porous foam metal member is made of porous foamed copper or porous aluminum foam, and is cut into strips. to make.

In the above technical solution, preferably, the porous metal foam member is a porous foamed copper member or a porous aluminum foam member.

In the above technical solution, preferably, the liquid phase change working fluid is water, ammonia or n-hexane.

Of course, the porous foam metal member may also be other foam metal parts, and the liquid phase change working medium may also be other liquid phase change working materials, as long as they do not deviate from the design concept of the present invention, and are within the protection scope of the present invention. .

DRAWINGS

1 is a cross-sectional structural view of a pan according to an embodiment of the present invention;

Figure 2 is a cross-sectional view showing the structure of the pot shown in Figure 1 taken along the line A-A;

3 is a schematic block diagram of a method for fabricating a pan according to an embodiment of the present invention;

4 is a schematic block diagram showing a method of fabricating a pan according to another embodiment of the present invention.

Wherein, the correspondence between the reference numerals and the component names in FIGS. 1 and 2 is:

10 pot body shell, 101 first circular flange, 20 pot body shell, 201 second ring flange, 30 hollow body, 40 porous foam metal parts, 50 flow gap, 60 metal tube.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation or position of indications such as "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of the description of the invention and the simplification of the description, and does not indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation, and thus It is not to be understood as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, can also be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.

A pot and a method of making the same according to some embodiments of the present invention are described below with reference to FIGS. 1 through 4.

As shown in FIG. 1 and FIG. 2, some embodiments of the present invention provide a pot comprising: a pot inner shell 10, a pot body shell 20, a porous foam metal member 40, and a liquid phase change working medium (not shown). Out).

The pot body shell 20 is sleeved on the outer side of the inner pot body 10 and welded with the inner pot shell 10 to form a closed hollow body 30. The hollow body 30 is a vacuum chamber; the porous foam metal member 40 is disposed in the inner body of the pot. The outer side wall surface of 10 and/or the inner side wall surface of the pot body casing 20, and a flow guiding gap 50 between adjacent two porous foam metal members 40; the liquid phase change working medium is located at the bottom position of the hollow body body 30, and It is capable of volatilizing and condensing along the holes in the porous foam metal member 40.

Preferably, as shown in FIG. 2, a plurality of porous foam metal members 40 are radially distributed to form a flow gap 50 between adjacent porous metal foam members 40.

The pot provided by the above embodiment of the present invention is an uncoated physical non-stick pot adopting a double-layer structure, and a hollow hollow body 30 forming a vacuum between the inner pot shell 10 of the pot and the pot body shell 20, hollow The position of the cavity 30 near the upper portion A porous foam metal member 40 is disposed at a radial distribution, such as a porous foam metal member 40 bonded to the outer wall surface of the inner body casing 10, and a liquid phase change working medium is injected at a position near the bottom portion of the hollow cavity body 30 ( Such as water, ammonia or n-hexane, etc., so that the bottom of the pot is heated. When the temperature at the bottom of the pot is increased to a certain temperature (such as temperature > 100 ° C), the liquid in the hollow body 30 near the bottom is liquid. The vaporization vaporizes to a gas and is transferred along the flow guiding gap 50 between the adjacent two porous foam metal members 40 toward the condensing end of the hollow cavity 30 near the upper portion, accompanied by effective conduction of heat. The position near the open end of the pot is heated, and the cooled phase change working medium is condensed and re-converted into a liquid, and the liquid is adsorbed in the pores in the porous foam metal member 40, and along the porous foam metal piece under the action of gravity 40 flows to the bottom of the hollow cavity 30, and then re-evaporates after being heated again. The heating and condensing process is continuously circulated and reciprocated, thereby ensuring that the temperature field of each part of the whole cookware is kept substantially the same after heating for several minutes (such as temperature difference energy). It can be controlled at ±4 °C), that is, the temperature of each part of the whole pot is evenly distributed, and finally the surface of the pot has good physical non-stick effect during cooking; and the above-mentioned pot does not need to be in the pot. The inner wall surface is sprayed with non-stick coating such as fluororesin, so that the wear resistance of the non-stick coating is poor, the bonding force is not ideal, the life is short, and it is easy to fall off, which affects the non-stick effect of the pot during cooking. And the service life, and effectively prevent the non-stick coating from being absorbed by the human body, posing a safety hazard to the user's health.

The non-stick property of the pot of the present invention is achieved by a two-layer structure and a liquid phase change working medium in the two-layer structure, and the temperature of the bottom wall and the peripheral wall of the pot is relatively uniform. There is no non-stick coating on the inner side wall of the inner casing 10 of the pot, so that the peeling phenomenon of the non-stick coating and the pot has insufficient binding force, and the non-stick coating does not enter the food by the consumer. Absorbing, avoiding the safety hazard to the user's body.

At the same time, the inner wall surface of the inner casing 10 of the present invention has no non-stick coating, which can reduce the production difficulty of the pan, simplify the production process of the pan, thereby improving the production efficiency of the pan and greatly reducing the manufacturing of the pan. cost.

In one embodiment of the present invention, as shown in FIG. 1, the first annular flange 101 is bent outwardly at the mouth of the inner body casing 10, and the pot body of the pot body 20 is outwardly bent. The second annular flange 201, the first annular flange 101 is hermetically connected to the second annular flange 201 to form a closed hollow cavity 30 between the inner body casing 10 and the pot outer casing 20.

Preferably, the first annular flange 101 and the second annular flange 201 are welded together.

The first annular flange 101 on the inner body casing 10 and the second annular flange 201 on the body casing 20 are welded and sealed by a sealing process of the first annular flange 101 and the second annular flange 201, such as by a welding process. It is ensured that the welds are completely sealed without gaps. Preferably, the weld surface is polished and polished after welding, and a closed hollow cavity 30 is formed between the inner casing 10 and the pot outer casing 20.

Further, as shown in FIG. 1 , a connection port is formed at an upper position of the outer wall surface of the pot body casing 20, and a metal pipe 60 is provided at the connection port in close communication with the hollow cavity 30, and the metal pipe 60 is used for the hollow cavity. The liquid phase change medium is injected into the bottom of the body 30 such that the liquid phase change medium is deposited at the bottom of the hollow body 30, and the air in the hollow body 30 is discharged through the metal tube 60.

A connection port (for example, a hole having a diameter of about 3 mm) is opened at a position near the upper portion of the pot body casing 20, and then a metal pipe 60 of the same diameter (such as a metal hollow copper pipe) is inserted, and then the metal pipe 60 is in contact with the wall of the pot. The position is welded and sealed to realize the closed communication between the metal tube 60 and the hollow body 30, so that the liquid phase change medium is injected into the bottom of the hollow body 30 through the metal tube 60, and the air in the hollow body 30 is removed to make the hollow The cavity 30 is maintained in a vacuum state.

Preferably, the degree of vacuum in the hollow cavity 30 is from 10 ^-3 Pa to 10 ^-1 Pa.

The degree of vacuum in the hollow cavity 30 is controlled to be 10 ^-3 Pa to 10 ^-1 Pa, so as to reduce the phase transition temperature of the liquid phase change working medium, and facilitate the circulation vaporization and condensation of the liquid phase change working medium, thereby further ensuring the bottom of the cookware And the temperature uniformity of the upper part, thus ensuring the temperature uniformity of all parts of the whole pot. Of course, the degree of vacuum in the hollow cavity 30 is not limited to the above specific numerical range, and can be designed according to actual conditions.

Preferably, the inner body shell 10 and the pot outer casing 20 are stamped and formed by a stainless steel plate or an aluminum alloy plate, and the thickness of the stainless steel plate or the aluminum alloy plate ranges from 0.6 mm to 2.5 mm.

The inner body shell 10 and the pot body shell 20 are stamped and formed by using a stainless steel plate or an aluminum alloy plate, thereby ensuring the forming effect of the pan and ensuring the thermal conductivity of the pan; using a stainless steel plate or an aluminum alloy having a thickness ranging from 0.6 mm to 2.5 mm. The board not only ensures the strength of the pot, but also ensures the thermal conductivity of the pot.

Preferably, as shown in FIG. 2, the width of the hollow cavity 30 ranges from 1.5 mm to 4 mm; wherein the width of the hollow cavity 30 is formed between the outer side wall surface of the inner casing 10 and the inner side wall surface of the pan outer casing 20. Gap width.

Preferably, as shown in FIG. 1, the gap width between the outer side wall surface of the inner body casing 10 and the inner side wall surface of the pan outer casing 20 remains substantially the same.

Further preferably, the thickness of the porous foam metal member 40 is adapted to the width of the hollow cavity 30, and the porous foam metal member 40 has an average pore diameter of 0.2 mm to 0.4 mm and a porosity of 70% to 90%.

Of course, the average pore diameter and porosity of the porous foam metal member 40 are not limited to the above specific limits, and may be selected according to actual conditions; preferably, the porous foam metal member 40 is made of porous foamed copper or porous aluminum foam, and is cut into strips. to make.

The pot provided by the above embodiment of the present invention can be made by the following manufacturing method, as shown in FIG. 3 and FIG. 4, including the following steps:

Step S10, making the inner body shell 10 and the pot body casing 20;

Step S20, on the outer side wall of the inner body shell 10 and / or the inner side wall of the pot body shell 20 is provided with a porous foam metal member 40;

Step S30, the pot body shell 20 is sleeved on the outside of the pot body shell 10, and sealed with the pot body shell 10 to form a hollow body 30;

In step S40, the liquid phase change working medium is injected into the hollow cavity body 30, so that the liquid phase change working medium is deposited on the bottom of the hollow cavity body 30, and the vacuum degree in the hollow cavity body 30 is lowered to a preset value.

The above-mentioned manufacturing method can produce a two-layer structure uncoated physical non-stick pan, which can be vaporized and condensed through the circulation of the liquid working medium at the bottom of the hollow cavity 30 when the bottom of the pan is heated. Effectively transfer the heat from the bottom of the pot to the upper part of the pot, thus ensuring that the temperature field of each part of the whole pot is kept consistent after heating for a few minutes, and finally the surface of the pot has a good physical non-stick effect during cooking. And the pot does not pose a safety hazard to the user's health.

Further, as shown in FIG. 4, the step S40 specifically includes:

Step S402, a connection port is opened at an upper position of the outer wall surface of the pot body casing 20, and a metal pipe 60 is hermetically connected at the connection port;

Step S404, injecting a liquid phase change working medium into the hollow cavity 30 through the metal pipe 60, and then heating the bottom of the pan body casing 20 to vaporize and volatilize the liquid phase change working medium to remove the air in the hollow cavity body 30;

Step S406, using a vacuum pump through the metal tube 60, continue to reduce the degree of vacuum in the hollow body 30 to a preset value;

In step S408, the outer port of the metal tube 60 is sealed in a vacuum environment.

Preferably, the preset value is 10 ^-3 Pa to 10 ^-1 Pa.

In the process of vacuuming the hollow cavity 30, the bottom portion of the pan is heated and vaporized, so that part of the liquid phase change working medium in the pan is vaporized and volatilized, thereby the inner cavity 30 of the pan and the porous foam metal. The air in the member 40 is gradually removed, so that the hollow body 30 reaches a low pressure state (for example, 10 ¹ Pa to 10 ² Pa); then the residual air in the hollow body 30 of the cookware is continuously pumped through the metal pipe 60 by a vacuum pump. The treatment further increases the low vacuum condition inside the pores to ensure an approximate vacuum environment (for example, 10 ^-3 Pa to 10 ^-1 Pa) in the hollow body 30 of the entire pot, and the pot body 20 is in a vacuum environment. The outer end of the upper metal tube 60 is sealed, such as a welded seal, thereby ensuring that the hollow body 30 of the entire pot maintains an approximate vacuum environment, such as 10 ^-3 Pa to 10 ^-1 Pa, to reduce the phase of the liquid phase change working medium. The temperature is changed to facilitate the circulation vaporization and condensation of the liquid phase change working medium, thereby further ensuring the temperature uniformity of the bottom and the upper part of the pot, thereby ensuring the temperature uniformity of each part of the whole pot.

Embodiment 1:

Step S10, using a stainless steel sheet having a thickness of 1 mm, stamping and forming in the mold 1 and the mold 2, respectively, as the pot inner shell 10 and the pot body casing 20 of the pot, wherein the inner pot body 10 and the pot body shell 20 have An epitaxial annular flange, and when the inner body shell 10 and the pot body casing 20 are assembled, a hollow body 30 of 2.5 mm to 3 mm can be maintained between the two;

Step S20, cutting a porous foamed copper mesh having an average pore diameter of about 0.2 mm to 0.4 mm, a three-dimensional interconnected space network, and a porosity of 70 to 80% and a thickness of about 3 mm, into a strip structure. , is adhered to the outer surface of the inner body shell 10 in an array arrangement, and a certain flow gap 50 is left between each two strips of porous metal copper mesh, and the bottom of the pot continues to maintain the cavity state. ;

In step S30, the inner body shell 10 is fitted into the pot body casing 20, and the porous foam copper mesh adhered to the outer surface of the inner body shell 10 can be attached to the inner surface of the pot body casing 20, and then The top flange of the two is welded into one Body and polishing and polishing the surface of the weld;

Step S402, drilling a small hole with a diameter of 3 mm at a position close to the top of the pot body casing 20 and corresponding to the hollow cavity body 30, and inserting a metal hollow copper tube of the same diameter, and then welding the contact position of the copper tube with the pot wall. seal;

Step S404, injecting an appropriate amount of liquid phase change working medium (such as water or ammonia gas) into the hollow cavity 30 through a metal hollow copper tube, and heating the bottom of the pot to vaporize and volatilize part of the liquid phase change working medium, and hollow the pot. The air in the cavity 30 and the porous foam copper mesh is gradually removed to a certain low pressure state (about 10 ¹ - 10 ² Pa), and the metal hollow copper tube is sealed;

Step S406, using a vacuum pump through the metal hollow copper tube, continue to draw the inside of the hollow body 30 of the pot into a low vacuum environment (about 10 ^-3 Pa);

Step S408, in a vacuum environment, the metal housing pan on the hollow copper tube 20 seals the outer end of the welding, to ensure that the entire hollow cavity 30 in the pot to maintain an approximate vacuum (about 10 ^-3 Pa), so as to complete the The production of double-layer structure soaking pots.

Embodiment 2:

Step S10, using an aluminum alloy sheet having a thickness of 2 mm, stamping and forming in the mold 1 and the mold 2, respectively, as the inner pot shell 10 and the pot body casing 20 of the pot, wherein the inner pot shell 10 and the pot body shell 20 are both With an epitaxial annular flange, and the inner body shell 10 and the pot body shell 20 are assembled, a hollow body 30 of 2.5 mm to 3 mm can be maintained between the two;

Step S20, cutting a porous aluminum foam mesh having an open pore structure composed of a three-dimensional interconnected space network having an average pore diameter of about 0.3 mm to 0.4 mm and having a porosity of 70 to 90% and a thickness of about 3 mm, into a strip structure. , adhered to the outer surface of the inner body shell 10 in an array arrangement, and a certain flow gap 50 is left between each two strips of porous metal aluminum mesh, and the bottom of the pot continues to maintain the cavity state. ;

In step S30, the inner body shell 10 is assembled into the pot body casing 20, and the porous aluminum foam net bonded to the outer surface of the inner body shell 10 can be attached to the inner surface of the pot body casing 20, and then The annular flanging at the top of the two is welded together, and the surface of the weld is polished and polished;

Step S402, drilling a small hole with a diameter of 3 mm at a position near the top of the pot body casing 20 corresponding to the hollow cavity body 30, and inserting a metal hollow aluminum tube of the same diameter, and then welding the contact position of the aluminum tube with the pot wall. seal;

Step S404, injecting an appropriate amount of liquid phase change working medium (such as n-hexane) into the hollow cavity through a metal hollow aluminum tube, and heating the bottom of the pot to vaporize and volatilize part of the liquid phase change working medium, and the cavity in the pot is evaporated. The air in the body 30 and the porous aluminum foam mesh is gradually removed to a certain low pressure state (about 10 ¹ to 10 ² Pa), and the metal hollow aluminum tube is sealed;

In step S406, the vacuum air pump is used to pass through the metal hollow tube, and the residual air inside the hollow body 30 in the pot is continuously evacuated, and the interior of the hollow body 30 is evacuated into a low vacuum environment (about 10 ^-2 Pa).

Step S408, in the vacuum environment, the outer end of the metal hollow aluminum tube on the pot body casing 20 is welded and sealed, thereby ensuring an approximate vacuum environment (about 10 ^-2 Pa) in the hollow body 30 of the entire pot, thereby completing the whole. The production of double-layer structure soaking pots.

In summary, the pot provided by the present invention is an uncoated physical non-stick pan with a double-layer structure, a hollow hollow body formed between the inner body shell of the pot and the outer shell of the pot body, and a hollow cavity A porous foam metal member is arranged radially adjacent to the upper portion of the body, and a liquid phase change working medium is injected at a position near the bottom of the hollow body, so that when the bottom portion of the cookware is heated, it can pass through the hollow body. The circulating liquidification and condensation of the liquid working fluid at the bottom is effective to transfer the heat at the bottom of the pan to the upper part of the pan, thereby ensuring that the temperature field of each part of the whole pan is kept consistent after heating for several minutes, and finally the surface of the pan is realized. It has a good physical non-stick effect when cooking, and the pot does not pose a safety hazard to the user's health.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Further, various embodiments or examples described in this specification can be joined and combined by those skilled in the art.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A pot appliance characterized by comprising:

Pot body shell;

a pot body sleeve is sleeved on the outer side of the inner pot shell and welded to the inner pot shell to form a closed hollow cavity, the hollow cavity body being a vacuum cavity body;

a liquid phase change working medium at a bottom position of the hollow cavity;

Wherein, the inner wall surface of the inner body of the pot has no non-stick coating.
A pan according to claim 1, further comprising: a porous foam metal member disposed on an outer side wall of said inner body casing and/or an inner side wall of said pan outer casing, said liquid phase transition The working fluid is capable of volatilizing and condensing along the pores in the porous foam metal member.
The pot according to claim 2, wherein a flow guiding gap is provided between adjacent ones of said porous foam metal members.
The pot according to claim 1, wherein

a first annular flange that is bent outward is disposed at a mouth of the inner body of the pot body, and a second annular flange that is outwardly bent is disposed at a mouth of the pot body shell, and the first annular turn The second annular flange is hermetically connected to form a closed hollow cavity between the inner body casing and the outer casing of the pan.
The pot according to claim 4, wherein

The first annular flange and the second annular flange are welded together.
The pot according to claim 1, wherein

a connecting port is formed at an upper position of the outer wall surface of the pot body, and the connecting port is provided with a metal tube in sealing communication with the hollow body, and the metal tube is used for injecting into the bottom of the hollow body The liquid phase changes the working medium and allows air in the hollow cavity to be discharged through the metal tube.
The pot according to claim 1, wherein

The degree of vacuum in the hollow cavity is 10 -3 Pa to 10 -1 Pa.
A pot according to any one of claims 1 to 7, wherein

The inner pot shell and the outer pot shell are stamped and formed by a stainless steel plate or an aluminum alloy plate; the stainless steel plate or the aluminum alloy plate has a thickness ranging from 0.6 mm to 2.5 mm.
A pot according to any one of claims 1 to 7, wherein

The hollow body has a width ranging from 1.5 mm to 4 mm;

Wherein, the width of the hollow cavity is a gap width formed between an outer wall surface of the inner casing of the pan and an inner sidewall surface of the pan outer casing.
The pot according to claim 2, wherein

The thickness of the porous foam metal member is adapted to the width of the hollow cavity metal member, and the porous foam metal member has an average pore diameter of 0.2 mm to 0.4 mm and a porosity of 70% to 90%.
The pot according to claim 2, wherein

The porous foam metal member is a porous foamed copper member or a porous aluminum foam member.
A pot according to any one of claims 1 to 7, wherein

The liquid phase change working fluid is water, ammonia or n-hexane.