A steam heating cooking device with a titanium inner liner

Abstract

The application provides a steam heating cooking device with a titanium inner container and belongs to the technical field of daily necessities. The steam heating cooking device solves the technical problems of poor safety, complex structure and poor heat preservation effect in the prior art. The steam heating cooking device comprises a pot body, the pot body comprises an inner container made of titanium metal or titanium alloy, an outer shell one made of metal is arranged on the periphery of the inner container, and a vacuum cavity is arranged between the inner container and the outer shell one. The inner container made of titanium metal or titanium alloy can improve the cleanliness, avoid the penetration of harmful substances during cooking and improve the safety.

Description

Technical Field

[0001] This invention belongs to the field of daily necessities technology and relates to a steam heating cooking device with a titanium inner liner. Background Technology

[0002] Traditional cooking mainly involves direct heating, such as using a rice cooker. However, this method results in poor taste when cooking rice and other ingredients. To address this issue, some people use steam to heat food directly.

[0003] Steam-heated cooking appliances generally include steam rice cookers and similar devices. Steam rice cookers break through the traditional heating method by using pure steam to heat the rice. The 120-degree high-temperature steam generated is directly injected into the inner pot. The technologies used include steam heating technology, steam output control technology, 316 medical-grade piping, 304 stainless steel inner pot, and water level self-identification technology.

[0004] For example, Chinese patent 201721751411.X discloses a rice cooker that uses only steam heating, including a pot body and a frame for placing the pot body. A steam generator is installed inside the frame, and the steam generated by the steam generator enters the pot body to cook the food. It uses only steam for heating, ensuring even heating of the food placed in the pot body.

[0005] However, the aforementioned devices also have problems such as poor safety, complex structure, and poor heat preservation effect. Summary of the Invention

[0006] To address the aforementioned problems in existing technologies, this invention provides a steam heating cooking device with a titanium inner liner. The technical problem this invention aims to solve is: how to improve cooking safety and heat preservation effect.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A steam heating cooking device with a titanium inner liner includes a pot body, characterized in that the pot body includes an inner liner made of titanium metal or titanium alloy, and the outer shell made of metal is provided around the inner liner, and a vacuum cavity is provided between the inner liner and the outer shell.

[0009] The principle is as follows: This cooking device uses steam heating, introducing steam into the pot to heat the food. The inner pot, made of titanium or titanium alloy, improves cleanliness, preventing harmful substances from leaching out during cooking and enhancing safety. An outer shell, also made of metal, surrounds the inner pot, creating a vacuum cavity between them. This vacuum cavity improves heat retention; once cooked, heat loss is prevented through the vacuum cavity. Compared to ordinary rice cookers, this reduces energy consumption and provides better heat preservation.

[0010] As one option, the outer shell is made of titanium or titanium alloy. The upper edge of the inner liner is welded to the upper edge of the outer shell, and the lower part of the outer shell is self-sealing or the lower edge of the outer shell is welded to the bottom of the inner liner. Welding between titanium or titanium alloys is relatively strong. The sealing of the upper edge and lower part of the inner liner creates a vacuum cavity between the inner liner and the outer shell, improving insulation. The self-sealing of the outer shell is similar to the waterproof and airtight bottom of a typical container. However, the outer shell can also be sealed by welding its lower edge to the bottom of the inner liner. This sealing method allows for the design of through holes or other structures at the bottom of the outer shell.

[0011] As an alternative, the outer shell is made of stainless steel, and the upper edge of the inner liner and the upper edge of the outer shell are welded together using filler solder to create a seal. The lower part of the outer shell is self-sealing, or the lower edge of the outer shell is welded to the bottom of the inner liner for a seal. Using stainless steel for the outer shell saves costs while ensuring a sealed vacuum cavity with the inner liner, as stainless steel is less expensive than titanium or titanium alloys. Furthermore, stainless steel has good adhesion to silicone sealant, making it easier to create a vacuum structure on the stainless steel outer shell.

[0012] As a further preferred embodiment, the upper edge of the inner liner is bent to form a horizontal stepped surface and a vertical welded surface. The edges of the stepped surface and the welded surface are connected. The welded surface has an inwardly recessed annular cavity. The upper edge of the outer shell is bent to form a vertical welded surface. The upper edge of the welded surface is connected to a horizontal abutment surface. The welded surfaces are abutted and fixed by filling the annular cavity with solder. The abutment surface abuts against the stepped surface. The stepped surface is used for vertical positioning by abutting against the abutment surface. The welded surfaces are sealed and fixed by welding. The annular cavity is used to hold the solder. After the welded surfaces are abutted, the paste-like solder in the annular cavity is heated and filled along the gap between the welded surfaces under gravity. After cooling and fixing, a seal is formed. This results in a high degree of sealing, no gaps, and a strong connection.

[0013] As a further preferred embodiment, the second welding surface has an annular rib protruding in the direction of the second welding surface, and the annular rib is partially located within the annular cavity. The purpose of designing the annular rib is to compress the solder within the annular cavity, making the solder more compacted and improving the sealing performance.

[0014] As an alternative, the upper edge of the inner liner is bent to form a vertical flange one, and the upper end of the outer shell one is bent inward to form a horizontal flange two and a vertical flange three. The outer surface of flange three has an inwardly recessed annular cavity. The lower end face of flange one abuts against flange two, and the inner surface of flange one abuts against the outer surface of flange three. The flanges are then welded together by filling the annular cavity with solder. Vertical positioning is achieved by the abutting of flange one and flange two. The annular cavity itself serves the same purpose as described above. Designing the annular cavity on the outer shell one simplifies the structure of the inner liner, especially if the outer shell one is made of inexpensive materials such as stainless steel, which facilitates processing and reduces costs. The welding method for flange one and flange three is as described above.

[0015] As a further preferred option, the solder is titanium solder paste or other fusible solder paste. Titanium solder paste can be heated into a paste and cooled to weld and fix titanium metals together or to other metals. Other solder pastes can be copper-based or aluminum-based, which are relatively low in cost.

[0016] Preferably, the cooking device further includes a second outer shell that surrounds the first outer shell. The upper edge of the second outer shell has an inwardly stepped surface, and the upper edge of the inner pot is bent to form a first abutment surface. The second stepped surface is located above the first abutment surface, and the two at least partially abut against each other. The function of the second outer shell is to protect the first outer shell and also to serve a decorative purpose. Generally, the second outer shell is made of non-metallic material. The second stepped surface and the first abutment surface abut against each other to form a positioning mechanism, allowing the second outer shell to be securely fastened to the inner pot with good connection strength.

[0017] Preferably, an annular receiving cavity is formed between the inner side of the upper part of the outer shell, the second stepped surface, and the outer side of the inner liner. An annular sealing ring is provided within the receiving cavity to seal the gap between the inner liner and the outer shell. The receiving cavity houses the sealing ring, which seals the gap between the outer shell and the inner liner to prevent water vapor and other substances from entering and causing rusting of components or bacterial growth.

[0018] Preferably, the bottom or side surface of the second outer shell has a through-hole recess II, and the bottom or side surface of the first outer shell has a through-hole recess I, with recess I and recess II corresponding in position; or the bottom or side surface of the first outer shell has a blind-hole-shaped groove, with recess II corresponding in position, and the bottom of the groove fitting against the outer wall of the inner pot. Recesses I and II facilitate the passage of a temperature probe. Generally, cooking appliances are equipped with temperature probes to monitor the temperature of the inner pot in order to automatically control the steam supply. The temperature probe can be located on the side or at the bottom. The first outer shell can also be made into a blind-hole-shaped groove, so that the lower part of the outer shell does not have a recess. The first outer shell and the inner pot fit together at this point to achieve heat transfer. The temperature probe can detect the temperature of the inner pot by contacting the first outer shell. This blind-hole-shaped groove structure is simple, easy to manufacture, and improves the sealing between the inner pot and the first outer shell.

[0019] Preferably, the bottom of the second outer casing is further provided with an elastic bushing. The outer surface of the bushing has an annular groove, which divides the bushing into an upper sealing part and a lower retaining edge. The upper sealing part can be inserted into the recess of the first outer casing and abuts against the first outer casing to form a seal. The edge of the recess of the second outer casing is inserted into the annular groove to form a tight fit. The lower retaining edge is located outside the recess and abuts against the outer surface of the second outer casing to form a positioning. The function of the bushing is to strengthen the fixation and sealing between the second and first outer casings. The function of the annular groove is to fit into the second outer casing. In this way, the temperature probe can be isolated from contact with the second outer casing by the bushing, which strengthens the temperature retention at that point and improves the detection accuracy of the temperature probe.

[0020] Preferably, the second outer casing is made of plastic or rubber. Plastic and rubber components are poor conductors of heat, thus protecting the internal components.

[0021] Preferably, the outer shell has a recessed evacuation cavity on its side or bottom. The bottom of the evacuation cavity has an evacuation hole that communicates with the vacuum chamber. The evacuation cavity is filled with a sealing material that seals the evacuation hole. Generally, the entire inner liner and outer shell are placed in a vacuum heating furnace and heated until the sealing material becomes a paste. After vacuuming and cooling, the sealing material solidifies and seals the evacuation hole.

[0022] Preferably, the sealing material is silicone sealant or titanium solder paste. Silicone sealant has a high bonding strength with stainless steel, while titanium solder paste can bond with both titanium and stainless steel.

[0023] Preferably, the cooking device further includes a lid that engages with the pot body. The inner side of the lid has a steam guide rod extending downwards into the pot body for transporting steam. The steam guide rod has a steam guide cavity along its length. The lower end face of the steam guide rod has a downward-facing steam outlet (or vent) and several side-opening steam outlets (or vents) on its side. Both steam outlets (or vents) are connected to the steam guide cavity. Steam enters from the upper end of the steam guide rod, is transported downwards along the steam guide cavity, and is injected into the inner pot through steam outlets (or vents) (or vents). The downward-facing steam outlets (or vents) and the side-opening steam outlets (or vents) (or vents) allow for more even steam distribution, resulting in better cooking of the food inside the inner pot.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] 1. The inner pot of this cooking appliance is made of titanium or titanium alloy, which can improve cleanliness, prevent harmful substances from seeping out during cooking, and improve safety.

[0026] 2. The vacuum chamber of this cooking device can improve heat preservation. After the food is cooked, the vacuum chamber can prevent heat loss. Compared with ordinary rice cookers, it reduces the use of electricity and has a better heat preservation effect. Attached Figure Description

[0027] Figure 1 This is a three-dimensional front view of the cooking device.

[0028] Figure 2 This is a three-dimensional diagram of the reverse side of this cooking device.

[0029] Figure 3 This is a front view schematic diagram of this cooking device.

[0030] Figure 4 yes Figure 3 AA section view in the image.

[0031] Figure 5 This is a combined sectional view of the inner liner and outer shell 1 and outer shell 2.

[0032] Figure 6 yes Figure 5 Enlarged view of part C in the middle.

[0033] Figure 7 This is a partial schematic diagram of Embodiment 2.

[0034] Figure 8 yes Figure 4 Enlarged view of part B in the image.

[0035] Figure 9 This is a partial schematic diagram of Embodiment 3.

[0036] In the diagram, 1 is the pot body; 2 is the inner liner; 3 is the outer shell I; 4 is the vacuum chamber; 5 is the stepped surface I; 6 is the welded surface I; 7 is the annular cavity; 8 is the welded surface II; 9 is the abutting surface II; 10 is the annular rib; 11 is the flange I; 12 is the flange II; 13 is the flange III; 14 is the outer shell II; 15 is the stepped surface II; 16 is the abutting surface I; 17 is the receiving cavity; 18 is the sealing ring; 19 is the notch II; 20 is the notch I; 21 is the groove; 22 is the bushing; 23 is the annular groove; 24 is the upper sealing part; 25 is the lower baffle; 26 is the suction cavity; 27 is the suction hole; 28 is the pot lid; 29 is the air guide rod; 30 is the air guide cavity; 31 is the air outlet I; 32 is the air outlet II. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0038] Example 1

[0039] like Figures 1-5 As shown, this steam heating cooking device includes a pot body 1, which includes an inner liner 2 made of titanium or titanium alloy. The inner liner 2 is surrounded by a metal outer shell 3, and a vacuum cavity 4 exists between the inner liner 2 and the outer shell 3. The cooking device also includes a lid 28, which is fastened to the pot body 1. The inner side of the lid 28 has a steam guide rod 29 extending downwards into the pot body 1 for conveying steam. The steam guide rod 29 has a steam guide cavity 30 along its length. The lower end face of the steam guide rod 29 has a downward-facing steam outlet 31, and the side of the lower end of the steam guide rod 29 has several side-opening steam outlets 32. Both the steam outlets 31 and 32 are connected to the steam guide cavity 30. Steam is input from the upper end of the air guide rod 29, and is transported downward along the air guide chamber 30 of the air guide rod 29, and is sprayed into the inner pot 2 through the air outlet 1 31 and the air outlet 2 32. The downward-facing air outlet 1 31 and the side-opening air outlet 2 32 can make the steam spray more even, and make the food in the inner pot 2 cook better.

[0040] like Figure 4As shown, the cooking apparatus also includes a second outer shell 14 that encloses the outer shell 3. The upper edge of the second outer shell 14 has an inwardly recessed stepped surface 15. The upper edge of the inner pot 2 is bent to form a first abutment surface 16. The stepped surface 15 is located above the first abutment surface 16, and the two at least partially abut against each other. The function of the second outer shell 14 is to protect the outer shell 3 and to serve a decorative purpose. Generally, the second outer shell 14 is made of non-metallic material. The stepped surface 15 and the first abutment surface 16 abut against each other to form a positioning, so that the second outer shell 14 is fixed to the inner pot 2 with good connection. An annular receiving cavity 17 is formed between the upper inner side of the second outer shell 14, the stepped surface 15, and the outer side of the inner pot 2. An annular sealing ring 18 is provided in the receiving cavity 17. The sealing ring 18 is used to seal the gap between the inner pot 2 and the second outer shell 14. The cavity 17 is used to house the sealing ring 18. The function of the sealing ring 18 is to seal the gap between the outer shell 14 and the inner liner 2 to prevent water vapor and other substances from entering and causing the components to rust or bacteria to grow.

[0041] like Figure 4 and Figure 8 As shown, the bottom or side surface of the outer shell 3 has a blind-hole-shaped groove 21, and the position of the recess 19 corresponds to that of the groove 21. The bottom of the groove 21 fits against the outer wall of the inner pot 2. Generally, cooking appliances are equipped with a temperature probe to monitor the temperature of the inner pot 2 in order to automatically control the steam supply. The temperature probe can be set on the side or at the bottom. The outer shell 3 can also be made into a blind-hole-shaped groove 21, so that the lower part of the outer shell 3 does not have a recess. The outer shell 3 and the inner pot 2 fit together at this point to achieve heat transfer. The temperature probe can detect the temperature of the inner pot 2 by contacting the outer shell 3. This blind-hole-shaped groove 21 has a simple structure, is easy to process, and improves the sealing between the inner pot 2 and the outer shell 3.

[0042] like Figure 8 As shown, the bottom of the second outer casing 14 is also provided with a flexible bushing 22. The outer side of the bushing 22 has an annular groove 23, which divides the bushing 22 into an upper sealing part 24 and a lower retaining edge 25. The upper sealing part 24 can be inserted into the recess 20 of the first outer casing 3 and abuts against the first outer casing 3 to form a seal. The edge of the recess 19 of the second outer casing 14 is inserted into the annular groove 23 to form a tight fit. The lower retaining edge 25 is located outside the recess 19 and abuts against the outer surface of the second outer casing 14 to form a positioning. The function of the bushing 22 is to strengthen the fixation and sealing between the second outer casing 14 and the first outer casing 3. The function of the annular groove 23 is to fit into the second outer casing 14, so that the temperature probe can be isolated from the contact between the second outer casing 14 and the temperature at that point by the bushing 22, thereby strengthening the temperature retention and improving the detection accuracy of the temperature probe. The second outer casing 14 is made of plastic or rubber. Plastic and rubber parts are not good heat conductors and can protect the internal components.

[0043] like Figure 4As shown, a concave evacuation cavity 26 is provided on the side or bottom of the outer shell 3. The bottom of the evacuation cavity 26 has an evacuation hole 27 that communicates with the vacuum chamber 4. The evacuation cavity 26 is filled with a sealing material that seals the evacuation hole 27. Generally, the entire inner liner 2 and the outer shell 3 are placed in a vacuum heating furnace and heated so that the sealing material becomes a paste. After vacuuming and cooling, the sealing material solidifies and seals the evacuation hole 27.

[0044] The sealing material is either silicone sealant or titanium solder paste. Silicone sealant has a high bonding strength with stainless steel, while titanium solder paste can bond with both titanium and stainless steel.

[0045] like Figure 4 As shown, the outer shell 3 is made of stainless steel. The upper edge of the inner liner 2 and the upper edge of the outer shell 3 are welded and sealed together by filler solder. The lower part of the outer shell 3 is self-sealing, or the lower edge of the outer shell 3 is welded and sealed to the bottom of the inner liner 2. Using stainless steel for the outer shell 3 can save costs while ensuring that a sealed vacuum cavity 4 can be formed with the inner liner 2, because the cost of stainless steel is lower than that of titanium or titanium alloys. In addition, stainless steel has a good adhesion to glass glue, which makes it easy to create a vacuum structure on the stainless steel outer shell 3.

[0046] As a further preferred embodiment, the upper edge of the inner liner 2 is bent to form a horizontal stepped surface 5 and a vertical welding surface 6. The edges of the stepped surface 5 and the welding surface 6 are connected. The welding surface 6 has an inwardly recessed annular cavity 7. The upper edge of the outer shell 3 is bent to form a vertical welding surface 8. The upper edge of the welding surface 8 is connected to a horizontal abutment surface 9. The welding surfaces 6 and 8 abut against each other and are fixed by welding with solder filled into the annular cavity 7. The abutment surface 9 abuts against the stepped surface 5. The stepped surface 5 is used for vertical positioning by abutting against the abutment surface 9. The welding surfaces 6 and 8 are fixed by welding and sealing. The annular cavity 7 is used to contain the solder. After the welding surfaces 6 and 8 abut against each other, the paste-like solder in the annular cavity 7 is heated and filled along the gap between the welding surfaces 6 and 8 under the action of gravity. After cooling and fixing, a seal is formed. This results in a high degree of sealing, no gaps, and a strong connection. As a further preferred embodiment, the welding surface 8 has an annular rib 10 protruding towards the welding surface 8, and part of the annular rib 10 is located within the annular cavity 7. The function of the annular rib 10 is to compress the solder within the annular cavity 7, making the solder more compact and improving the sealing performance.

[0047] In this embodiment, the solder is titanium solder paste or other fusible solder paste. Titanium solder paste can be heated into a paste and cooled to weld and fix titanium metals together or to other metals. Other solder pastes can be copper-based or aluminum-based, which are relatively low in cost.

[0048] This cooking appliance uses steam heating, directing steam into the pot body 1 to heat the food. The inner pot 2, made of titanium or titanium alloy, improves cleanliness, preventing the leaching of harmful substances during cooking and enhancing safety. An outer shell 3, also made of metal, surrounds the inner pot 2, creating a vacuum cavity 4 between them. This vacuum cavity 4 improves heat retention; once the food is cooked, heat loss is prevented, reducing energy consumption compared to a regular rice cooker and providing better heat preservation.

[0049] Example 2

[0050] like Figure 7 As shown, the general content of this embodiment is the same as that of Embodiment 1. The difference is that, as another solution, the upper edge of the inner liner 2 is bent to form a vertical flange 11, and the upper end of the outer shell 3 is bent inward to form a horizontal flange 2 12 and a vertical flange 3 13. The outer surface of flange 3 13 has an inwardly recessed annular cavity 7. The lower end face of flange 11 abuts against flange 2 12, and the inner surface of flange 11 abuts against the outer surface of flange 3 13. The flanges are fixed by welding by filling the annular cavity 7 with solder. Vertical positioning is achieved by the abutting of flange 11 and flange 2 12. The function of the annular cavity 7 is the same as described above. Designing the annular cavity 7 on the outer shell 3 simplifies the structure of the inner liner 2. In particular, if the outer shell 3 is made of inexpensive materials such as stainless steel, it can facilitate processing and reduce costs. The abutting welding method of flange 11 and flange 3 13 is the same as described above.

[0051] Example 3

[0052] like Figure 9 As shown, the general content of this embodiment is the same as that of Embodiment 1, except that, as another option, the bottom or side surface of the outer shell 2 14 has a through-hole recess 2 19, and the bottom or side surface of the outer shell 1 3 has a through-hole recess 20. The positions of recess 20 and recess 2 19 are corresponding; recess 20 and recess 2 19 facilitate the passage of the temperature probe.

[0053] Example 4

[0054] This embodiment is largely the same as Embodiment 1, except that, as an alternative, the outer shell 3 is made of titanium or titanium alloy. The upper edge of the inner liner 2 is welded to the upper edge of the outer shell 3, and the lower part of the outer shell 3 is self-sealing or the lower edge of the outer shell 3 is welded to the bottom of the inner liner 2. Welding between titanium or titanium alloys is relatively strong. The sealing of the upper and lower edges of the inner liner 2 creates a vacuum cavity 4 between the inner liner 2 and the outer shell 3, improving insulation. The self-sealing of the outer shell 3 is similar to the waterproof and airtight bottom of a typical container. However, the outer shell 3 can also be sealed by welding its lower edge to the bottom of the inner liner 2. This sealing method allows for the design of through holes or other structures at the bottom of the outer shell 3.

[0055] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0056] Although the above terms have been used extensively in this document, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would be contrary to the spirit of the invention.

Claims

1. A steam heating cooking device with a titanium inner liner, comprising a pot body (1), characterized in that, The pot body (1) includes an inner liner (2) made of titanium metal or titanium alloy, and an outer shell (3) made of metal is provided around the inner liner (2). A vacuum cavity (4) is provided between the inner liner (2) and the outer shell (3). The outer shell (3) is made of stainless steel. The upper edge of the inner liner (2) and the upper edge of the outer shell (3) are welded and sealed by filler solder. The upper edge of the inner liner (2) is bent to form a horizontal step surface (5) and a vertical welded surface (6). The edge of the step surface (5) and the edge of the welded surface (6) are connected. The welded surface (6) has an inwardly recessed annular cavity (7). The upper edge of the outer shell (3) is bent to form a vertical... A straight welding surface two (8) is provided, and a horizontal abutment surface two (9) is connected to the upper edge of the welding surface two (8). The welding surface one (6) and the welding surface two (8) abut against each other and are fixed by welding by filling the annular cavity (7) with solder. The abutment surface two (9) abuts against the step surface one (5). The welding surface two (8) has an annular rib (10) protruding in the direction of the welding surface two (8). The annular rib (10) is partially located in the annular cavity (7).

2. The steam heating cooking device with a titanium inner liner according to claim 1, characterized in that, The cooking device also includes a second outer shell (14) that wraps around the outer shell (3). The upper edge of the second outer shell (14) has an inwardly folded stepped surface (15). The upper edge of the inner pot (2) is bent to form a first abutting surface (16). The second stepped surface (15) is located above the first abutting surface (16) and the two at least partially abut against each other. An annular receiving cavity (17) is formed between the inner side of the upper part of the second outer shell (14), the second stepped surface (15), and the outer side of the inner pot (2). An annular sealing ring (18) is provided in the receiving cavity (17).

3. A steam heating cooking device with a titanium inner liner according to claim 2, characterized in that, The bottom or side surface of the second outer shell (14) has a through recess (19), and the bottom or side surface of the first outer shell (3) has a through recess (20), with the first recess (20) and the second recess (19) corresponding to each other; or the bottom or side surface of the first outer shell (3) has a blind hole-shaped groove (21), with the second recess (19) and the groove (21) corresponding to each other, and the bottom of the groove (21) fitting against the outer wall of the inner liner (2); the bottom of the second outer shell (14) is also provided with an elastic bushing (22), and the outer side of the bushing (22) The surface has an annular groove (23), which divides the bushing (22) into an upper sealing part (24) and a lower stop edge (25). The upper sealing part (24) can be inserted into the recess (20) of the outer shell (3) and abuts against the outer shell (3) to form a seal. The edge of the recess (19) of the outer shell (24) is inserted into the annular groove (23) and forms a tight fit. The lower stop edge (25) is located outside the recess (19) and abuts against the outer surface of the outer shell (24) to form a positioning. The outer shell (24) is a plastic part or a rubber part.

4. A steam heating cooking device with a titanium inner liner according to claim 1 or 2, characterized in that, The outer shell (3) has a recessed air extraction cavity (26) on its side or bottom. The bottom of the air extraction cavity (26) has an air extraction hole (27) that communicates with the vacuum chamber (4). The air extraction cavity (26) is filled with a sealing material that seals the air extraction hole (27).

5. A steam heating cooking device with a titanium inner liner according to claim 1 or 2, characterized in that, The cooking device also includes a pot lid (28), which is fastened to the pot body (1). The inner side of the pot lid (28) has a steam guide rod (29) extending downward into the pot body (1) for conveying steam. The steam guide rod (29) has a steam guide cavity (30) along its length. The lower end face of the steam guide rod (29) has a downward-facing steam outlet hole (31). The side of the lower end of the steam guide rod (29) has several side-opening steam outlet holes (32). Both the steam outlet hole (31) and the steam outlet hole (32) are connected to the steam guide cavity (30).

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