CN211511441U

CN211511441U - Pressure cooker with rigid frame

Info

Publication number: CN211511441U
Application number: CN201922334385.6U
Authority: CN
Inventors: 叶刚
Original assignee: Tuopu Jinggong Intelligent Manufacturing Shaoyang Co ltd
Current assignee: Tuopu Jinggong Intelligent Manufacturing Shaoyang Co ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-09-18
Anticipated expiration: 2029-12-24

Abstract

The pressure cooker with the rigid frame comprises a cooker base and a cooker cover which can cover the cooker base, wherein the rigid frame is arranged in the cooker cover, the rigid frame is in a frame shape and comprises a plate-shaped web plate and an outer frame surrounding the periphery of the web plate, and the outer frame and the web plate are integrally arranged; the space defined by the outer frame is also provided with a vacant part, and the web plate is at least the boundary of part of the vacant part; the frame is characterized in that all frames of the outer frame comprise concave-convex cavity walls so as to have concave-convex reinforcing rib structures, and at least part of edge positions of the web plate facing the vacant positions are provided with bent bulges so as to form plate-shaped reinforcing rib structures. The invention has the beneficial technical effects that: because all frames of the outer frame comprise concave-convex cavity walls and thus have concave-convex reinforcing rib structures, the structural strength of the outer frame is enhanced, and the deformation resistance of the outer frame is improved.

Description

Pressure cooker with rigid frame

Technical Field

The invention relates to the technical field of pressure cookers, in particular to a pressure cooker with a rigid frame.

Background

Pressure cookers are common pressurized food cooking devices, and generally include a lid and a base on which a cooking cavity is disposed. During cooking, an internal pressure greater than the external atmospheric pressure is generated in the cooking cavity, so that the pot base and the pot cover are subjected to a large outward expansion force. The pot cover is generally made of thermoplastic plastics, so that the pot cover can generate upward arched deformation under the action of pressure in the pot, after the pressure is raised for many times, the deformation of the pot cover can become irreversible plastic deformation, so that an uneven gap is formed between the pot cover and the pot base, the pressure in the containing cooking cavity cannot be stored and the temperature can not be raised, and the normal use of the pressure pot is seriously influenced. In order to guarantee the pot cover has sufficient structural strength in order to bear the ability of a kind of deep pot internal pressure, it is right the structure of pot cover has improved, and neotype pressure cooker lid is generally including outer pot cover, interior pot cover and setting up be in five metals frame between outer pot cover, the interior pot cover is as strengthening the pressure-bearing mechanism through five metals frame. For example, the electric rice cooker disclosed in chinese patent No. cn201020559895.x includes an upper cover assembly including a face cover, an inner cover, and a front reinforcing plate disposed between the face cover and the inner cover, wherein two opposite lateral sides adjacent to the front reinforcing plate are respectively designed as protruding beams, a groined-shaped reinforcing assembly is disposed between the front reinforcing plate and the inner cover, and the groined-shaped reinforcing assembly includes two lateral reinforcing rods and two longitudinal reinforcing rods. Therefore, under the cooperative reinforcing action of the front reinforcing plate and the groined reinforcing component, the bearing strength of the inner cover can be enhanced, and the deformation of the inner cover is reduced.

Disclosure of Invention

After research and experiments are carried out on the front reinforcing plate in the patent CN201020559895.X, the front reinforcing plate is found to be bulged and deformed in the middle position after being subjected to multiple pressure rising and pressure reducing processes, and the fact that the structural strength of the front reinforcing plate is still insufficient is proved, so that the pot cover still has deformation risk in the pressure rising process. In view of the above technical problems, the present invention provides a pressure cooker with a rigid frame, which includes a cooker base and a cooker cover capable of covering the cooker base, wherein the cooker cover is internally provided with the rigid frame, the rigid frame is in a frame shape and includes a plate-shaped web plate and an outer frame surrounding the periphery of the web plate, and the outer frame and the web plate are integrally arranged; a vacant part is further arranged in a space defined by the outer frame, and the web plate is at least a part of the boundary of the vacant part; the frame structure is characterized in that all frames of the outer frame comprise concave-convex cavity walls so as to have concave-convex reinforcing rib structures, and at least part of edge positions of the web plate facing the vacant positions are provided with bending protrusions so as to form plate-shaped reinforcing rib structures.

Wherein the web is at least partially bounded by the void, the above feature defining that part or all of the boundaries of the void are bounded by edges of the web.

In one embodiment, the outer frame may include two frames, or three, four or more frames may be provided, and each frame may be connected end to form a closed loop, or a space may be provided between two adjacent frames.

The outer frame comprises a frame body, wherein all frames of the outer frame comprise concave-convex cavity walls so as to form concave-convex reinforcing rib structures; secondly, the above feature further defines that the frame of the outer frame includes a concave-convex cavity wall, the concave-convex cavity wall is used to form a concave-convex reinforcing rib structure, when viewed from one side of the rigid frame, the cavity wall protrudes from the web or other parts of the frame to form a convex shape, and when viewed from the other side of the rigid frame, the part corresponding to the cavity wall is arranged in a concave manner relative to the web or other parts of the frame to form a concave shape.

The bending bulge is arranged on at least part of the edge position of the web facing the vacant part, and the characteristic defines that the bending bulge is arranged on part or all of the edge position of the web facing the vacant part, so that the bending bulge can strengthen the deformation resistance of the web.

According to the technical scheme, compared with the prior art, the invention has the beneficial technical effects that: firstly, all frames of the outer frame comprise concave-convex cavity walls so as to have concave-convex reinforcing rib structures, so that the structural strength of the outer frame is enhanced, and the deformation resistance strength of the outer frame is improved; and then, at least part of the edge position of the web plate facing the vacant part is provided with a bending bulge to form a plate-shaped reinforcing rib structure, so that the structural strength of the web plate can be strengthened by utilizing the plate-shaped reinforcing rib structure, and the deformation resistance of the web plate is improved. So can strengthen in coordination through the above-mentioned concave-convex strengthening rib structure and platelike strengthening rib structure the peripheral position of rigidity frame and the structural strength of middle part position to can promote the overall structure intensity of rigidity frame can slow down rigidity frame is suffered to step up the degree that steps down the in-process and appear warping many times, thereby just also be favorable to slowing down the deformation degree of pot lid reduces the pressure loss in the pot, maintains the normal work of pressure cooker.

The technical scheme can be that the outer frame is rectangular and comprises a front frame and a rear frame which are arranged in the front and the rear direction, and a left frame and a right frame which are arranged in the left and the right direction, the front frame and the rear frame are respectively arranged between the left frame and the right frame, and gaps for avoiding are respectively arranged at the two ends of the concave-convex cavity wall of the front frame and the rear frame and the transition part between the left frame and the right frame. According to the technical scheme, the processing difficulty of the concave-convex cavity wall of the front frame and the concave-convex cavity wall of the rear frame in the stamping forming process is favorably reduced.

The left frame and the right frame respectively extend out of the front frame and the rear frame in the front and rear directions, connecting ear holes are respectively arranged on the extending parts at the front end and the rear end of the left frame and the right frame, and the central axes of the left connecting ear hole and the right connecting ear hole are overlapped and are vertical to the axes of the left frame and the right frame in the front and rear directions; the pot cover is hinged with the rear end of the pot base through a hinge mechanism, the hinge mechanism comprises a hinge shaft, and the connecting lug holes in the rear end extending parts of the left frame and the right frame are respectively sleeved on the hinge shaft; the pot cover and the front end of the pot base are locked through a cover locking mechanism, the cover locking mechanism comprises a combination rotating shaft, and the connecting lug holes in the front end extending parts of the left frame and the right frame are respectively sleeved on the combination rotating shaft. According to the technical scheme, the connection stability between the pot cover and the pot base after the pot cover is covered on the pot base is enhanced, the pot cover is not easy to be blown away under the action of pressure expansion in the pressure boosting process of the pressure cooker, and the use safety of the pressure cooker is improved.

The technical scheme can be further that, when viewed from the cross sections of the left frame and the right frame, the concave-convex cavity walls of the left frame and the right frame are in a door frame shape, and more than 2 first installation through holes are arranged on the top walls of the concave-convex cavity walls of the left frame and the right frame at intervals; the pot cover is provided with a connecting wall capable of extending into the cavities of the left frame and the right frame, and a connecting screw penetrates through the first mounting through hole to connect the left frame and the right frame to the connecting wall. According to the technical scheme, the left frame and the right frame are used for storing the connecting wall, so that the mounting space occupied by the rigid frame on the pot cover can be reduced; in addition, the connecting wall can be combined with the left frame and the right frame to form a composite reinforcing structure, and the composite reinforcing structure can cooperatively resist the top pressure formed by the outward bulging of the cooker cover when the pressure cooker is boosted, so that the deformation degree of the cooker cover is reduced.

The technical scheme can also be that the frame comprises a left frame, a right frame and auxiliary reinforcing ribs, wherein the auxiliary reinforcing ribs are in a strip shape, and at least the frame top walls of the concave-convex cavity walls of the left frame and the right frame are covered with the auxiliary reinforcing ribs; the auxiliary reinforcing rib is provided with more than 2 second mounting through holes, and the connecting screws sequentially penetrate through the second mounting through holes and the first mounting through holes and then connect the auxiliary reinforcing rib to the left frame and the right frame. According to the technical scheme, the auxiliary reinforcing ribs are respectively combined with the left frame and the right frame to form a composite reinforcing structure, and the composite reinforcing structure is used for cooperatively resisting the top pressure formed by the outward bulging of the cooker cover when the pressure cooker is boosted, so that the deformation degree of the cooker cover is further reduced. In addition, the auxiliary reinforcing ribs may be only covered on the frame top walls of the left and right frames, or may be simultaneously covered on the frame top walls and the frame side walls of the left and right frames.

The technical scheme can be that the auxiliary reinforcing rib is in a door frame shape matched with the concave-convex cavity walls of the left frame and the right frame when viewed from the cross section of the auxiliary reinforcing rib, and the auxiliary reinforcing rib covers the concave-convex cavity walls of the left frame and the right frame. According to the technical scheme, the auxiliary reinforcing ribs in the shape of the door frame have better structural strength, are favorable for being better combined with the left frame and the right frame, and cooperatively resist the top pressure formed by the outward bulging of the pot cover when the pressure cooker is boosted, so that the deformation degree of the pot cover is further reduced.

The further technical scheme can also be that the concave-convex cavity walls of the front frame and the rear frame are arched when viewed from the cross sections of the front frame and the rear frame. Thus, the deformation resistance of the front frame and the rear frame can be enhanced.

The further technical scheme can also be that steel bars are arranged in the cavities of the front frame and the rear frame, and two ends of each steel bar respectively extend to the cavity wall positions of the left frame and the right frame. According to the technical scheme, the installation structure of the steel bars can be simplified, a composite reinforcing structure can be formed by combining the steel bars with the front frame and the rear frame, and the top pressure formed by outward bulging of the pot cover when the pressure cooker is boosted can be resisted in a cooperative mode, so that the deformation degree of the pot cover is further reduced.

The technical scheme can also be that a skirt edge is arranged on the outer side of the outer frame and is flatly attached to the pot cover. According to the technical scheme, the gap between the skirt edge and the cooker cover is very small or even zero, when the pressure cooker is pressurized, the cooker cover can be pressed on the skirt edge as long as slight outward bulging deformation occurs on the cooker cover, the pressing force caused by outward bulging of the cooker cover is transmitted to the rigid frame through the skirt edge, and the rigid frame is used for resisting the deformation of the cooker cover.

The pot cover further comprises an outer cover and an inner cover, and the rigid frame is arranged between the outer cover and the inner cover.

Due to the above features and advantages, the present invention may be applied to pressure cookers with rigid frames.

Drawings

FIG. 1 is a schematic diagram of an exploded structure of a pressure cooker with a rigid frame to which the present invention is applied;

FIG. 2 is a schematic structural view of a rigid frame according to the present invention;

fig. 3 is a schematic sectional structure view in the direction of a-a in fig. 2, showing the cross-sectional structure of the concavo-convex cavity walls (341, 331) of the front and rear frames 34, 33;

fig. 4 is a schematic sectional structure view in the direction B-B in fig. 2, showing the cross-sectional structure of the concavo-convex cavity walls (311, 321) of the left and right frames 31, 32;

fig. 5 is a schematic cross-sectional structure of the auxiliary reinforcing bead 2.

Detailed Description

The structure of the pressure cooker with rigid frame to which the technical solution of the present invention is applied will be further described with reference to the accompanying drawings.

As shown in fig. 1 to 4, the pressure cooker with a rigid frame includes a cooker base 200 and a cooker cover 100 capable of covering the cooker base 200, wherein the cooker cover 100 is provided with the rigid frame 300, the rigid frame 300 is shaped like a frame and includes a plate-shaped web 30 and an outer frame 3 surrounding the periphery of the web 30, and the outer frame 3 is integrally provided with the web 30; a vacant part 35 is arranged in the space defined by the outer frame 3, and the web 30 is at least partially the boundary of the vacant part 35; the outer frame 3 has a concave-convex rib structure by including concave-convex cavity walls (311, 312, 331, or 341) in all frames, and a plate-shaped rib structure is formed by providing bending protrusions 38 at least at a part of the edge of the web 30 facing the vacant part 35.

The above technical solution is further explained with reference to the accompanying drawings. As shown in fig. 1 to 3, the pressure cooker includes a cooker base 200 and a cooker cover 100 capable of covering the cooker base 200, and when the pressure cooker is normally heated and pressurized, the cooker cover 100 must cover the cooker base 200 to reduce the loss of gas and heat in the cooker, so as to increase the pressure in the cooker. The pot cover 100 comprises an outer cover 1, an inner cover 5 and a rigid frame 300 arranged between the outer cover 1 and the inner cover 5, when the pressure in the pot rises, the inner cover 5 can be arched upwards and deformed under the action of the pressure in the pot, if the pressure in the pot is borne by the inner cover 5 only, the inner cover 5 can form irreversible plastic deformation after being pressed and deformed for many times, so that the gap between the inner cover 5 and the pot base 200 is uneven, air leakage can be caused in serious conditions, and the pressure pot can not work normally under pressure. In this embodiment, a rigid frame 300 is further disposed between the outer lid 1 and the inner lid 5, and the rigid frame 300 receives the pressure in the cooker together with the inner lid 5. The rigid frame 300 is frame-shaped and includes a plate-shaped web 30 and an outer frame 3 surrounding the web 30, and the outer frame 3 and the web 30 are integrally provided. The outer frame 3 is rectangular and comprises a front frame 34 and a rear frame 33 which are arranged in front and at the back, and a left frame 31 and a right frame 32 which are arranged in left and right, wherein the front frame 34 and the rear frame 33 are respectively arranged between the left frame 31 and the right frame 32. The front frame 34 includes a concave-convex cavity wall 341, the rear frame 33 includes a concave-convex cavity wall 331, the left frame 31 includes a concave-convex cavity wall 311, and the right frame 32 includes a concave-convex cavity wall 321. Thus, the structural strength of the outer frame 3 is advantageously reinforced, and the deformation resistance of the outer frame 3 is improved. Gaps (36, 36 a) for avoidance are respectively arranged at the transition positions between the two ends of the concave-convex cavity wall 341 of the front frame 34 and the left frame 31 and the right frame 32, and gaps (37, 37 a) for avoidance are respectively arranged at the transition positions between the two ends of the concave-convex cavity wall 331 of the rear frame 33 and the left frame 31 and the right frame 32. This is advantageous for reducing the difficulty in processing the concave-convex cavity walls 341 of the front frame 34 and the concave-convex cavity walls 331 of the rear frame 33 in the press molding process.

As shown in fig. 4, the concave-convex cavity walls (311, 321) of the left and right frames 31, 32 are in a shape of a door frame when viewed from the cross section of the left and right frames 31, 32. The concave-convex cavity wall 311 includes a frame top wall 3111 and frame side walls (3112, 3113) disposed on the left and right sides of the frame top wall 3111, the concave-convex cavity wall 321 includes a frame top wall 3211 and frame side walls (3212, 3213) disposed on the left and right sides of the frame top wall 3211, and at least 2 first mounting through holes (3110, 3210) are respectively disposed on the frame top wall 3111 of the concave-convex cavity wall 311 and the frame top wall 3211 of the concave-convex cavity wall 321 at intervals. The inner cover 5 is provided with connecting walls (51, 52) which can be inserted into the cavities of the left and right frames 31, 32, and connecting screws pass through the first mounting through holes (3110, 3210) to connect the left and right frames 31, 32 to the connecting walls (51, 52), respectively. Such an installation has at least two benefits: on the first hand, the connecting walls (51, 52) are collected by the left frame 31 and the right frame 32, so that the installation space occupied by the rigid frame 300 on the pot cover 100 can be reduced; in a second aspect, the connecting walls (51, 52) can be combined with the left and right frames 31, 32 to form a composite reinforcing structure, and cooperatively resist the top pressure force generated by the outward bulging of the inner cover 5 when the pressure of the pressure cooker is increased, so as to reduce the deformation degree of the inner cover 5.

As shown in fig. 1 and 5, the utility model also comprises an auxiliary reinforcing rib (2, 2 a) which is long. The auxiliary reinforcing ribs (2, 2 a) have similar cross-sectional structures when viewed from the cross sections of the auxiliary reinforcing ribs (2, 2 a), and are in door frame shapes matched with the concave-convex cavity walls (311, 321) of the left frame 31 and the right frame 32 respectively. Taking the auxiliary reinforcing rib 2 as an example for description, the auxiliary reinforcing rib 2 includes a rib top wall 21 and rib side walls (22, 23) disposed on left and right sides of the rib top wall 21. The rib top wall 21 is provided with 2 or more second mounting through holes 210. The auxiliary reinforcing ribs (2, 2 a) cover the concave-convex cavity walls (311, 321) of the left frame 31 and the right frame 32 respectively. The connecting screws sequentially penetrate through the second mounting through holes (210, 210 a) and the first mounting through holes (3110, 3210) and then connect the auxiliary reinforcing ribs (2, 2 a) to the left frame 31 and the right frame 32 respectively. According to the technical scheme, the auxiliary reinforcing ribs (2, 2 a) are respectively combined with the left frame 31 and the right frame 32 to form a composite reinforcing structure, and the composite reinforcing structure is used for cooperatively resisting the top pressure formed by the outward bulging of the inner cover 5 when the pressure of the pressure cooker is increased, so that the deformation degree of the inner cover 5 is further reduced. In another embodiment, the auxiliary beads (2, 2 a) may be plate-shaped and cover only the frame top walls (3111, 3211) of the left and right frames 31, 32.

As shown in fig. 1, the pot base 200 includes a seat body 13, the support ring 11 disposed at a top position of the seat body 13 in a ring shape, and a reinforcing plate 12 disposed inside the support ring 11. The reinforcing plate 12 is attached to the support ring 11 by screws. In the front and rear direction, the left frame 31 and the right frame 32 extend out of the front frame 34 and the rear frame 33, respectively, and connection ear holes (3114, 3115, 3214, 3215) are respectively arranged on the extension parts of the front and rear ends of the left frame 31 and the right frame 32, and the central axes of the two corresponding left and right connection ear holes (3114 and 3214, 3115 and 3215) are overlapped and perpendicular to the central axes of the left frame 31 and the right frame 32 in the front and rear direction. The pot cover 100 is hinged with the rear end of the pot base 200 through a hinge mechanism 9, the hinge mechanism 9 comprises a hinge seat 91 and a hinge shaft 92, and the hinge seat 91 comprises a hinge seat main body 910 and hinge connection lugs (911, 912) arranged on the left side and the right side of the hinge seat main body 910. The screws are in turn connected to the reinforcing plate 12 through the hinge base body 910, the upstanding wall 111 on the support ring 11. The left and right ends of the hinge shaft 92 are respectively sleeved on the connecting ear holes (3115, 3215) on the rear end extension parts of the left and right frames 31, 32 and the through holes of the hinge connecting ears (911, 912). The cover 100 and the front end of the pan base 200 are locked together by a cover locking mechanism 6, the cover locking mechanism 6 includes an upper cover locking device 61, a lower cover locking device 62 and a combining rotating shaft 63, wherein the upper cover locking device 61 includes a lock catch main body 611 and lock catch engaging lugs (612, 613) arranged on the left and right sides of the lock catch main body 611, the upper cover locking device 61 is arranged on the cover 100, and the left and right ends of the combining rotating shaft 63 are respectively sleeved in the through holes of the engaging lug holes (3114, 3214) on the front end extension parts of the left and right frames 31, 32 and the lock catch engaging lugs (612, 613) of the upper cover locking device 61. The lower locking cover 62 is disposed on the pot base 200, and screws are connected to the support ring 11 and the reinforcing plate 12 through the lower locking cover 62. When the upper cover locking device 61 and the lower cover locking device 62 are locked together, the pot cover 100 can be covered on the pot base 200. According to the above technical solution, after the cooker lid 100 is covered on the cooker base 200, the upper cover locking device 61 is fastened to the lower cover locking device 62, the rigid frame 300 and the front and rear ends of the reinforcing plate 12 are respectively connected to the hinge mechanism 9 through the cover locking mechanism 6, and during the pressure rising process of the pressure cooker, the pressure borne by the cooker lid 100 can be simultaneously transmitted to the rigid frame 300 and the reinforcing plate 12 through the hinge mechanism 9 and the cover locking mechanism 6, so that the reinforcing plate 12 and the support ring 11 cooperatively resist the pressure generated during the pressure rising process of the pressure cooker, thereby effectively slowing down the deformation of the inner lid 5 and the support ring 11, enabling the gap between the cooker lid 100 and the cooker base 200 to be uniformly maintained for a long time, reducing the pressure loss in the cooker, and ensuring the normal operation of the pressure cooker.

As shown in fig. 3, when viewed in cross section of the front frame 34 and the rear frame 33, the concave-convex cavity walls (341, 331) of the front frame 34 and the rear frame 33 are arched. In this way, the deformation resistance of the front frame 34 and the rear frame 33 can be enhanced. Further, steel bars (41, 42) are respectively arranged in the cavities of the front frame 34 and the rear frame 33, and two ends of the steel bars (41, 42) respectively extend to the positions of cavity walls (311, 312) of the left frame 31 and the right frame 32. According to the technical scheme, the installation structure of the steel bars (41, 42) can be simplified by utilizing the cavities of the front frame 34 and the rear frame 33 to store the steel bars (41, 42), a composite reinforcing structure can be formed by utilizing the combination of the steel bars (41, 42) and the front frame 34 and the rear frame 33, and the deformation degree of the inner cover 5 is further reduced by cooperatively resisting the jacking pressure formed by the outward bulge of the inner cover 5 when the pressure cooker is boosted.

As shown in fig. 2 and 3, a vacant part 35 is further disposed in the space defined by the outer frame 3, and the web 30 is at least partially bound by the vacant part 35. At least a part of the edge of the web 30 facing the gap 35 is provided with a bent projection 38 to form a plate-like reinforcing rib structure. In the present embodiment, the web 30 is a boundary of the entire empty portion 35, and the bending protrusion 38 is disposed at a partial edge position of the web 30 facing the empty portion 35 and is disposed opposite to the hinged end side of the pot lid 100 and the pot base 200, that is, the bending protrusion 38 is disposed at a front end position of the pot lid 100. The structural strength of the web 30 can be reinforced by the plate-shaped reinforcing rib structure, and the deformation resistance of the web is improved. Further, a skirt (312, 322, 332, 342) is further disposed at the outer side of the outer frame 3, and the skirt (312, 322, 332, 342) is flatly attached to the inner lid 5. According to the above technical solution, the clearance between the skirt (312, 322, 332, 342) and the inner cover 5 is very small, even zero, when the pressure of the pressure cooker is increased, the inner cover 5 can be pressed against the skirt (312, 322, 332, 342) as long as the skirt is slightly bulged outwards, and the pressing force caused by the bulging-out of the inner cover 5 is transmitted to the rigid frame 300 through the skirt (312, 322, 332, 342), so that the deformation of the inner cover 5 is resisted by the rigid frame 300.

According to the above technical scheme, can strengthen in coordination through the rib structure of above-mentioned unsmooth form and platelike rib structure the peripheral position of rigidity frame 300 and the structural strength of middle part position, thereby can promote the overall structure intensity of rigidity frame 300 can slow down rigidity frame 300 is suffering the degree that the step-up step-down in-process appears and is out of shape many times, thereby also be favorable to slowing down the deformation degree of pot cover 100 is favorable to letting pot cover 100 with the clearance between the pot base 200 maintains evenly in long-time, reduces the pressure loss in the pot, maintains the normal work of pressure cooker.

Claims

1. The pressure cooker with the rigid frame comprises a cooker base and a cooker cover capable of covering the cooker base, wherein the rigid frame is arranged in the cooker cover, the rigid frame is in a frame shape and comprises a plate-shaped web plate and an outer frame surrounding the periphery of the web plate, and the outer frame and the web plate are integrally arranged; a vacant part is further arranged in a space defined by the outer frame, and the web plate is at least a part of the boundary of the vacant part; the frame structure is characterized in that all frames of the outer frame comprise concave-convex cavity walls so as to have concave-convex reinforcing rib structures, and at least part of edge positions of the web plate facing the vacant positions are provided with bending protrusions so as to form plate-shaped reinforcing rib structures.

2. The pressure cooker with rigid frame as claimed in claim 1, wherein said outer frame is rectangular and comprises a front frame and a rear frame arranged in front and rear directions and a left frame and a right frame arranged in left and right directions, said front frame and said rear frame are respectively interposed between said left frame and said right frame, and the transition portions between the two ends of the concave-convex cavity wall of said front frame and said rear frame and said left frame and said right frame are respectively provided with a clearance for avoiding.

3. The pressure cooker with rigid frame as claimed in claim 2, wherein said left and right frames extend out of said front and rear frames in front and rear directions, respectively, and connecting ear holes are provided on the extending portions of the front and rear ends of said left and right frames, respectively, the central axes of the two corresponding left and right connecting ear holes are overlapped and perpendicular to the axes of said left and right frames in front and rear directions; the pot cover is hinged with the rear end of the pot base through a hinge mechanism, the hinge mechanism comprises a hinge shaft, and the connecting lug holes in the rear end extending parts of the left frame and the right frame are respectively sleeved on the hinge shaft; the pot cover and the front end of the pot base are locked through a cover locking mechanism, the cover locking mechanism comprises a combination rotating shaft, and the connecting lug holes in the front end extending parts of the left frame and the right frame are respectively sleeved on the combination rotating shaft.

4. The pressure cooker with rigid frame as claimed in claim 2, wherein the left and right frames have concave-convex walls in a door frame shape when viewed from their cross sections, and wherein the left and right frames have at least 2 first mounting holes spaced from each other on the top walls of the concave-convex walls; the pot cover is provided with a connecting wall capable of extending into the cavities of the left frame and the right frame, and a connecting screw penetrates through the first mounting through hole to connect the left frame and the right frame to the connecting wall.

5. The pressure cooker with rigid frame as claimed in claim 4, further comprising an elongated auxiliary reinforcement bar, wherein the auxiliary reinforcement bar covers at least the top wall of the concave-convex chamber walls of the left and right frames; the auxiliary reinforcing rib is provided with more than 2 second mounting through holes, and the connecting screws sequentially penetrate through the second mounting through holes and the first mounting through holes and then connect the auxiliary reinforcing rib to the left frame and the right frame.

6. The pressure cooker with rigid frame as claimed in claim 5, wherein the auxiliary reinforcement rib is shaped like a door frame fitting the concave-convex cavity walls of the left and right frames when viewed from the cross section of the auxiliary reinforcement rib, and the auxiliary reinforcement rib cover covers the concave-convex cavity walls of the left and right frames.

7. Pressure cooker with rigid frame according to claim 2, characterized in that the concave-convex shaped cavity walls of the front and rear frame are arched, seen in cross section.

8. The pressure cooker with rigid frame as claimed in claim 7, wherein steel bars are disposed in the cavities of the front and rear frames, and both ends of the steel bars extend to the cavity wall positions of the left and right frames, respectively.

9. The pressure cooker with rigid frame as claimed in any one of claims 1 to 8, wherein a skirt is further provided at the outer side of the outer rim, and the skirt is flatly attached to the lid.

10. Pressure cooker with rigid frame according to one of claims 1 to 8, characterized in that the lid comprises an outer lid and an inner lid, the rigid frame being arranged between the outer lid and the inner lid.