Frying and baking machine

Abstract

The invention discloses a frying and baking machine, belongs to the field of life electric appliances, solves the problem that an existing frying and baking machine cannot balance between micro-pressure keeping and timely pressure relief, and adopts the technical scheme that an upper baking tray is provided with an annular rib extending downwards, the periphery of the annular rib is provided with a sealing ring, and the upper baking tray covers a lower baking tray to form a cooking cavity; a round corner transition face is arranged between the inner side wall and the top end face of the lower baking tray, a matching curved face is arranged on the outer surface of the sealing ring, and the matching curved face abuts against the round corner transition face in a line contact mode when the upper baking tray assembly covers the lower baking tray assembly, so that the cooking cavity has certain air tightness. The upper baking tray assembly is pushed upwards by water vapor pressure generated in the cooking cavity in the cooking process, so that the matched curved surface is separated from the fillet transition surface for safe pressure relief. The micro-pressure frying pan is mainly used for frying food materials, it is ensured that the cooking cavity can be kept in the micro-pressure state, and meanwhile pressure can be relieved in time when the pressure exceeds the micro-pressure state.

Description

Technical Field

[0001] The invention relates to a household appliance, in particular to a frying and roasting machine. Background Art

[0002] When making pancakes, the existing electric pancake rack or grilling machine will leak air at the joint surface of the upper and lower grills / upper and lower baking trays, which will cause the pancakes to dry out easily. In order to solve this problem, the prior art CN200966569Y discloses an electric pancake rack, which includes an upper grill and a lower grill connected by hinges, at least one side of the joint surface of the upper grill and the lower grill is provided with a sealing gasket, and a stepped oil guide groove 4 and a positioning convex edge 5 are also provided therein, which makes it difficult for the upper grill to open due to the increase of air pressure in the cavity between the upper grill and the lower grill, resulting in the air pressure in the cavity cannot be discharged in time, resulting in the air pressure being too high, and the effect of micro-pressure cooking cannot be achieved, which affects the cooking effect.

[0003] Prior art CN211484134U discloses a grilling pan assembly and a grilling machine, which specifically discloses that when the grilling pan assembly is used with the cover buckled, the food in the lower grilling pan assembly will undergo a certain height change due to the heat, pushing the grilling pan 2 upward, or the grilling pan assembly will float upward due to internal water pressure and other reasons. Since the water-locking ribs 114 are fully extended into the inner cavity of the lower grilling pan when buckled, when the grilling pan assembly floats upward, the water-locking ribs 114 can keep the cooking chamber basically closed within its height range, reducing the water loss of the food. However, in actual use, since no sealing ring is provided, the cooking chamber between the grilling pan assembly and the lower grilling pan assembly cannot maintain internal micro-pressure for a period of time, and it is difficult to achieve the effect of micro-pressure cooking.

[0004] Prior art CN216494932U discloses a frying and roasting machine, specifically comprising: a first baking tray; a second baking tray, the second baking tray is hinged to the first baking tray, the first baking tray and the second baking tray have a closed position and an open position; a sealing ring, at least one of the first baking tray and the second baking tray is provided with a sealing ring, when the first baking tray and the second baking tray are in the closed position, the first baking tray, the second baking tray and part of the sealing ring are surrounded to form a closed frying and roasting cavity. When the first baking tray and the second baking tray are in the closed position, the sealing ring is used to seal the frying and roasting cavity formed by the first baking tray and the second baking tray, so that when the frying and roasting machine is used to fry and roast food, the frying and roasting cavity forms a closed micro-pressure space, so that the food in the closed frying and roasting cavity is baked at a micro-pressure, which can reduce the water loss in the food, shorten the baking time, improve the taste of the baked food, make the baked food crispy on the outside and tender on the inside, save time and energy, and improve the practicality of the frying and roasting machine. In the grilling machine of the prior art, there are two sealing methods for the sealing ring. One is to rely on the weight of the first grilling tray to make the sealing ring contact with the end surface of the second grilling tray to complete the sealing. However, when a certain air pressure is generated in the grilling cavity, it is easy to cause a gap between the sealing member and the end surface of the second grilling tray, resulting in the failure to maintain a micro-pressure state in the grilling cavity. The second method is to make the sealing member contact with the inner side surface of the second grilling tray to complete the sealing. At this time, the sealing member is greatly deformed and fits tightly with the inner side surface of the second grilling tray. The air pressure in the grilling cavity cannot easily push the upper grilling tray to be lifted, resulting in the air pressure in the grilling cavity continuing to rise above the micro-pressure state. At this time, when the user opens the grilling cavity, splashing may occur, posing a certain safety hazard. Summary of the invention

[0005] The purpose of the present invention is to provide a grilling machine to solve the problem of the existing grilling machine that the balance between maintaining micro-pressure and timely pressure relief cannot be achieved, so as to ensure that the cooking cavity can maintain a micro-pressure state and can release the pressure in time when the pressure exceeds the micro-pressure state.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a frying and grilling machine comprises a lower baking tray assembly and an upper baking tray assembly, the lower baking tray assembly comprises a lower baking tray, the upper baking tray assembly comprises an upper baking tray, the upper baking tray is provided with an annular rib extending downward, the outer periphery of the annular rib is provided with a sealing ring, the upper baking tray covers the lower baking tray to form a cooking cavity, a fillet transition surface is provided between the inner side wall and the top end surface of the lower baking tray, the outer surface of the sealing ring is provided with a matching curved surface, the matching curved surface is in linear contact and abutment with the fillet transition surface when the upper baking tray assembly covers the lower baking tray assembly, so that the cooking cavity has a certain airtightness, and the upper baking tray assembly is pushed upward by the water vapor pressure generated in the cooking cavity during the cooking process, so that the matching curved surface is separated from the fillet transition surface for safe pressure relief.

[0007] After adopting the above technical scheme, the present invention has the following advantages: when the upper baking tray assembly covers the lower baking tray assembly, the matching curved surface and the rounded transition surface are in line contact with each other, so that the contact uniformity and fit between the matching curved surface and the rounded transition surface are better, so that the cooking cavity can maintain a micro-pressure state within a certain pressure range. When the air pressure in the cooking cavity continues to increase, the upper baking tray will be pushed up by the air pressure and the matching curved surface and the rounded transition surface will gradually separate. As the pressure in the cooking cavity increases, the upper baking tray assembly moves upward faster until the upper baking tray assembly reaches the lower baking tray assembly. The sealing ring is completely separated from the rounded transition surface, and the high-pressure steam in the cooking cavity will be discharged from the cooking cavity, thereby achieving timely pressure relief. When the air pressure in the cooking cavity drops to a certain level, the upper baking tray assembly is re-covered on the lower baking tray assembly, so that the matching curved surface of the sealing ring can fit with the rounded transition surface again, which not only ensures that the cooking cavity can maintain a micro-pressure state, but also can relieve pressure in time when the pressure exceeds the micro-pressure state, and realizes that the cooking cavity can dynamically maintain a micro-pressure state, making the prepared food more fluffy, tender and juicy, improving the taste of food and increasing the safety of user use.

[0008] Furthermore, when the upper baking tray assembly is covered with the lower baking tray assembly, the matching curved surface is deformed from line contact to surface contact with the fillet transition surface. With the aforementioned technical solution, the matching curved surface and the fillet transition surface are deformed from line contact to surface contact, and the extrusion force of the sealing ring on the lower baking tray will gradually increase, and finally the matching curved surface and the fillet transition surface are completely fitted. At this time, the friction resistance between the matching curved surface and the fillet transition surface can ensure that the sealing ring will not easily separate from the lower baking tray, and ensure that the cooking cavity can increase the pressure value of the micro-pressure state within a certain pressure range. Moreover, the matching curved surface abuts against the fillet transition surface and changes from line contact to surface contact, which can make the sealing relationship between the two more uniform and stable, thereby improving the sealing effect on the cooking cavity.

[0009] Furthermore, the cross section of the matching curved surface and the sealing ring intersects to form an arc. With the above technical solution, the surface formed by the arc on the sealing ring is the matching curved surface, and the matching curved surface is set as an annular curved surface, so that the matching curved surface and the fillet transition surface can be better tangent to each other, and the arc surface is subjected to force, so that the matching curved surface is more likely to deform and fit the fillet transition surface, thereby ensuring the sealing stability of the sealing ring.

[0010] Furthermore, the cross section of the sealing ring is circular and has a radius of R. The upper baking tray has an upper end face facing the top end face of the lower baking tray. After the upper baking tray assembly covers the lower baking tray assembly, the distance between the upper end face and the top end face of the lower baking tray is h, 0<h<2R. With the above technical solution, h<2R, when the upper baking tray assembly covers the lower baking tray assembly, the sealing ring has a sufficient deformation amplitude to play a buffering and separation effect, and 0<h, so that there is always a gap between the top end face of the lower baking tray and the upper end face of the upper baking tray, ensuring that the upper end face of the upper baking tray and the top end face of the lower baking tray will not be in hard contact, preventing the coating from being damaged, extending the service life, and also reducing the noise when covering.

[0011] Furthermore, after the upper baking tray assembly covers the lower baking tray assembly, the center of the cross section of the sealing ring is higher than the top surface of the lower baking tray and the height difference is H, and the radius of the rounded transition surface is r, H<r. The above technical solution is adopted to ensure, on the one hand, the stability of the fit between the sealing ring and the rounded transition surface. The smaller H is, the tighter the fit between the sealing ring and the rounded transition surface is. At the same time, it plays a limiting role to prevent the upper and lower baking trays from shaking relative to each other. On the other hand, the deformation position of the sealing ring is controlled below the center of the cross section of the sealing ring, and excessive deformation will not occur, ensuring timely pressure relief.

[0012] Furthermore, the cross section of the sealing ring is a rectangle with an arc chamfer, and the arc chamfer forms a matching curved surface. With the above technical solution, the sealing ring can be fixed more stably on the upper baking tray by using a rectangular structure, is not easy to flip, has a stable position of the matching curved surface, has a good deformation effect, better fit with the rounded transition surface, and has a strong sealing effect.

[0013] Furthermore, the center of the cross section of the sealing ring is higher than the top surface of the lower baking tray after the upper baking tray assembly is covered on the lower baking tray assembly. With the above technical solution, the sealing ring plays a buffering and separating role, so that the upper surface of the upper baking tray and the top surface of the lower baking tray will not be in hard contact, thus preventing the coating on the baking tray from being damaged, extending the service life, and reducing the noise when covering.

[0014] Furthermore, the outer periphery of the annular rib is provided with an annular groove for positioning the sealing ring. With the above technical solution, the sealing ring is sleeved in the annular groove, which ensures the connection stability between the sealing ring and the upper baking tray and can also position the sealing ring.

[0015] Furthermore, the sealing ring is embedded in the annular groove and a part of its surface is in contact with the inner wall of the annular groove; or, there is a gap between the sealing ring and the annular groove. With the above-mentioned technical solution, the sealing ring is embedded in the annular groove, and the sealing ring has good contact with the annular groove, so that the force on the sealing ring is more uniform and the connection stability is high. At the same time, it plays a positioning role for the sealing ring, avoiding the sealing ring from flipping during the deformation process, ensuring that the matching curved surface can be stably in contact with the fillet transition surface; or, there is a gap between the sealing ring and the annular groove, so that the sealing ring has space for deformation after thermal expansion, avoiding excessive compression with the inner wall of the annular groove to affect the sealing performance.

[0016] Furthermore, the inner wall of the lower baking tray, the inner wall of the upper baking tray and / or the outer surface of the sealing ring are provided with a zinc oxide coating. With the above technical solution, the zinc oxide coating can inhibit the growth of bacteria, improve the hygienic safety of use, and is more suitable for the space capsule environment, meeting the needs of the national space kitchen project. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of a grilling machine of the present invention (I);

[0019] Figure 2 For the present invention Figure 1 The enlarged schematic diagram of point A in the middle;

[0020] Figure 3 It is a schematic diagram of the surface contact between the sealing ring and the fillet transition surface of the present invention;

[0021] Figure 4 This is a structural schematic diagram of a grilling machine of the present invention (II);

[0022] Figure 5 For the present invention Figure 4 The enlarged schematic diagram of point B in the middle;

[0023] Figure 6 It is a structural schematic diagram of a grilling machine of the present invention (III);

[0024] Figure 7 For the present invention Figure 6 The enlarged schematic diagram of the center C;

[0025] Figure 8 It is a schematic diagram of the bevel transition surface used in the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein.

[0028] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0029] It should be understood that in the present invention, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0030] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0031] like Figure 1 to Figure 2As shown, the present invention provides a grilling machine, including a lower grilling plate assembly and an upper grilling plate assembly, wherein the lower grilling plate assembly includes a lower grilling plate 2, and the upper grilling plate assembly includes an upper grilling plate 1, wherein the upper grilling plate 1 is provided with an annular rib 11 extending downward, and a sealing ring 12 is provided on the outer periphery of the annular rib 11. In this embodiment, the upper grilling plate 1 and the lower grilling plate 2 are connected by a hinge, and the upper grilling plate 1 is turned over to realize the switching between the covered state and the open state, wherein the upper grilling plate 1 is covered with the lower grilling plate 2 to form a cooking cavity 3, and the inner side wall 201 and the top of the lower grilling plate 2 are provided with a sealing ring 12. A rounded transition surface 22 is provided between the surfaces 202, and the rounded transition surface 22 is formed by arc chamfering between the inner wall 201 and the top end surface 202 of the lower baking tray 2. A matching curved surface 121 is provided on the outer surface of the sealing ring 12. When the upper baking tray assembly is covered on the lower baking tray assembly, the matching curved surface is in linear contact with the rounded transition surface to make the cooking cavity have a certain airtightness. During the cooking process, the upper baking tray assembly is pushed upward by the water vapor pressure generated in the cooking cavity, so that the matching curved surface is separated from the rounded transition surface 22 for safe pressure relief.

[0032] In the above embodiment, when the upper baking tray assembly covers the lower baking tray assembly, the matching curved surface and the rounded transition surface 22 are in line contact with each other, so that the contact uniformity and fit between the matching curved surface and the rounded transition surface 22 are better, so that the cooking cavity can maintain a micro-pressure state within a certain pressure range. When the air pressure in the cooking cavity continues to increase, the upper baking tray will be pushed upward by the air pressure. At this time, the matching curved surface and the rounded transition surface 22 will gradually separate. As the pressure in the cooking cavity rises, the upper baking tray assembly moves upward faster until the sealing ring is completely separated from the rounded transition surface 22, and the high-pressure steam in the cooking cavity will be discharged from the cooking cavity, thereby achieving timely pressure relief. When the air pressure in the cooking cavity drops to a certain level, the upper baking tray assembly is covered on the lower baking tray assembly again, so that the matching curved surface of the sealing ring can be fit with the rounded transition surface 22 again, so that the cooking cavity can dynamically maintain a micro-pressure state, making the prepared food more fluffy, tender and juicy, and improving the taste of the food. The annular ribs can be used to prevent oil and / or juice in the cooking cavity from splashing outwards.

[0033] In one embodiment, in order to keep the matching curved surface in line contact with the rounded transition surface 22, a support member can be provided between the lower baking tray assembly and the upper baking tray assembly to keep the matching curved surface in line contact with the rounded transition surface 22. When the lower baking tray assembly is closed, its gravity is borne by the support member and will not act on the sealing ring, which can ensure that the matching curved surface and the rounded transition surface 22 can maintain line contact, and a balance can be achieved between the two states of micro-pressure cooking and timely pressure relief. The support member can be a convex ring of the upper baking tray or the lower baking tray, or a separately provided ring body, which is placed between the upper baking tray and the lower baking tray. The height of the support member is just enough to keep the matching curved surface in line contact with the rounded transition surface 22.

[0034] In some applications, micro-pressure cooking may require a higher pressure environment. In order to increase the pressure value of the micro-pressure state and ensure the fit stability between the matching curved surface 121 and the rounded transition surface 22 and improve the sealing effect, the matching curved surface 121 can be deformed from line contact to surface contact with the rounded transition surface 22 when the upper baking tray assembly is covered on the lower baking tray assembly. Figure 3 , and the squeezing force of the sealing ring 12 on the lower baking tray 2 will gradually increase, and finally the matching curved surface 121 and the rounded transition surface 22 are completely fitted. At this time, the friction resistance between the matching curved surface 121 and the rounded transition surface 22 can ensure that the sealing ring 12 will not be easily separated from the lower baking tray 2, and ensure that the cooking cavity 3 can maintain a micro-pressure state within a certain pressure range. In addition, the matching curved surface 121 and the rounded transition surface 22 are in contact and transformed from line contact to surface contact, which can make the sealing relationship between the two more uniform and stable, thereby improving the sealing effect on the cooking cavity 3. When the upper baking tray assembly and the lower baking tray assembly are covered, the matching curved surface 121 of the sealing ring 12 and the rounded transition surface 22 will be transformed from line contact to surface contact. During the transformation process, there is friction resistance between the matching curved surface 121 of the sealing ring 12 and the rounded transition surface 22. The friction resistance can play a buffering and noise reduction effect on the covering of the upper baking tray 1 and the lower baking tray 2, and also avoid hard contact between the upper baking tray 1 and the lower baking tray 2, which is beneficial to protecting the coating on the upper and lower baking trays.

[0035] In order to make the sealing ring 12 and the lower baking tray 2 have better uniform contact, the cross section of the matching curved surface 121 and the sealing ring 12 intersects to form an arc, that is, the matching curved surface 121 is set as an annular arc surface, so that the tangency between the matching curved surface 121 and the rounded transition surface 22 is smoother and more stable, and the arc surface is subjected to force, so that the matching curved surface 121 is more likely to deform and fit the rounded transition surface 22, ensuring the sealing stability of the sealing ring 12. Figure 2 and Figure 3 As shown, in one embodiment, an O-ring is taken as an example, that is, the cross section of the sealing ring 12 is circular and the radius is R, the upper baking tray has an upper end surface 101 facing the top end surface 202 of the lower baking tray, and the distance between the upper end surface 101 and the top end surface of the lower baking tray after the upper baking tray assembly is covered on the lower baking tray assembly is h, 0<h<2R, wherein, h<2R, when the upper baking tray assembly and the lower baking tray assembly are covered, the sealing ring has sufficient deformation amplitude to play a buffering and separating effect, 0<h, then the top end surface of the lower baking tray and the upper end surface of the upper baking tray are always spaced apart, ensuring that the upper end surface of the upper baking tray and the top end surface of the lower baking tray will not be in hard contact, thereby preventing the coating from being damaged, extending the service life, and reducing the noise when covering.

[0036] After the upper baking tray assembly is covered on the lower baking tray assembly, the center of the cross section of the sealing ring 12 is higher than the top surface of the lower baking tray and the height difference is H. The radius of the rounded transition surface is r, and H can be selected to be less than r. On the one hand, the stability of the fit between the sealing ring 12 and the rounded transition surface 22 is ensured. The smaller H is, the larger the fitting surface between the sealing ring 12 and the rounded transition surface 22 is, and the tighter the fit is. At the same time, it plays a limiting role to prevent the upper and lower baking trays from shaking relative to each other. On the other hand, the deformation position of the sealing ring 12 is controlled below the center of the cross section of the sealing ring 12, and excessive deformation will not occur, ensuring timely pressure relief.

[0037] In addition to using an O-ring, in another embodiment, a sealing ring with a rectangular cross-section may be used, such as Figure 4 and Figure 5 As shown, the cross section of the sealing ring 12 is a rectangle with an arc chamfer, and the arc chamfer forms a matching curved surface 121. The sealing ring 12 with a rectangular cross section can be fixed more stably on the upper baking tray 1, the rectangular structure is not easy to flip, and the position of the matching curved surface 121 is stable, so that the upper baking tray assembly and the lower baking tray assembly can be covered more firmly. On this basis, the center of the cross section of the sealing ring can also be selected to be higher than the top surface of the lower baking tray after the upper baking tray assembly is covered on the lower baking tray assembly, so that the sealing ring can play a buffering and separating effect, so that the upper end surface of the upper baking tray and the top surface of the lower baking tray will not be in hard contact, thereby preventing the coating on the baking tray from being damaged, extending the service life, and reducing the noise during the covering.

[0038] It can be understood that, in addition to O-shaped and rectangular cross-sectional sealing rings, sealing rings with other cross-sectional shapes may also be used.

[0039] In one embodiment, in order to improve the reliability of fixing the sealing ring 12 and prevent the sealing ring 12 from falling off the upper baking tray 1 when the upper baking tray 1 is opened and closed, the sealing ring 12 can be fixed to the upper baking tray 1 as follows: Figure 3 , Figure 5 and Figure 7 As shown, an annular groove 111 for positioning the sealing ring 12 is provided on the outer periphery of the annular rib 11. The sealing ring 12 is sleeved in the annular groove 111 to ensure the connection stability of the sealing ring 12 fixed to the upper baking tray 1 and to position the sealing ring. The sealing ring is embedded in the annular groove and a part of its surface is in contact with the inner wall of the annular groove, for example Figure 5 and Figure 7 As shown, the cross-sectional shape of the annular groove is adapted to the cross-sectional shape of the sealing ring 12, and the sealing ring is embedded in the annular groove. The sealing ring and the annular groove have good fit, so that the force on the sealing ring is more uniform, the connection stability is high, and at the same time, it plays a positioning role for the sealing ring to prevent the sealing ring from turning over during the deformation process, ensuring that the matching curved surface can fit stably with the rounded transition surface. In addition, it can also be as Figure 3As shown, there is a gap between the sealing ring and the annular groove, which allows the sealing ring to have space to deform after thermal expansion, thereby avoiding excessive squeezing with the inner wall of the annular groove and affecting the sealing performance.

[0040] In one embodiment, a zinc oxide coating can be optionally provided on the inner wall of the lower baking tray, the inner wall of the upper baking tray and / or the outer surface of the sealing ring. The zinc oxide coating can inhibit bacterial growth, improve the hygiene and safety of use, and is more suitable for the space capsule environment, meeting the needs of the national space kitchen project.

[0041] In addition to the rounded transition surface 22, the rounded transition surface may also be an angled transition surface 23, where the angled transition surface 23 is formed by chamfering the inner side wall 201 and the top surface of the lower baking tray 2, and the matching curved surface may also be in line contact with the angled transition surface 23, or further changed from line contact to surface contact, such as Figure 8 shown.

[0042] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A grilling machine, comprising a lower grilling plate assembly and an upper grilling plate assembly, wherein the lower grilling plate assembly comprises a lower grilling plate, the upper grilling plate assembly comprises an upper grilling plate, the upper grilling plate is provided with an annular rib extending downward, a sealing ring is provided on the outer periphery of the annular rib, the upper grilling plate covers the lower grilling plate to form a cooking cavity, It is characterized in that A rounded transition surface is provided between the inner side wall and the top end surface of the lower baking tray, and a matching curved surface is provided on the outer surface of the sealing ring. When the upper baking tray assembly covers the lower baking tray assembly, the matching curved surface is in linear contact with the rounded transition surface to abut against it, so that the cooking cavity has a certain airtightness. During the cooking process, the upper baking tray assembly is pushed upward by the water vapor pressure generated in the cooking cavity, so that the matching curved surface is separated from the rounded transition surface for safe pressure relief.

2. The grilling machine according to claim 1, It is characterized in that When the upper baking tray assembly covers the lower baking tray assembly, the matching curved surface is deformed from line contact to surface contact with the fillet transition surface.

3. The grilling machine according to claim 1, It is characterized in that The matching curved surface intersects with the cross section of the sealing ring to form an arc.

4. The grilling machine according to claim 3, It is characterized in that The cross section of the sealing ring is circular with a radius of R. The upper baking tray has an upper end surface facing the top end surface of the lower baking tray. After the upper baking tray assembly covers the lower baking tray assembly, the distance between the upper end surface and the top end surface of the lower baking tray is h, 0<h<2R.

5. The grilling machine according to claim 3, It is characterized in that After the upper baking tray assembly covers the lower baking tray assembly, the center of the cross section of the sealing ring is higher than the top surface of the lower baking tray with a height difference of H, and the radius of the fillet transition surface is r, H<r.

6. The grilling machine according to claim 1, It is characterized in that The cross section of the sealing ring is a rectangle with an arc chamfer, and the arc chamfer forms a matching curved surface.

7. The grilling machine according to claim 6, It is characterized in that The center of the cross section of the sealing ring is higher than the top surface of the lower baking tray after the upper baking tray assembly is covered on the lower baking tray assembly.

8. The grilling machine according to claim 1, It is characterized in that An annular groove for positioning the sealing ring is arranged on the outer periphery of the annular rib.

9. The grilling machine according to claim 8, It is characterized in that The sealing ring is embedded in the annular groove and a part of its surface is in contact with the inner wall of the annular groove; or, there is a gap between the sealing ring and the annular groove.

10. The grilling machine according to claim 1, It is characterized in that The inner wall of the lower baking pan, the inner wall of the upper baking pan and / or the outer surface of the sealing ring are provided with a zinc oxide coating.

Images