Heat preservation tank with high sealing performance

Abstract

The high-sealing-performance heat preservation tank comprises a tank body and a heat preservation cover, the heat preservation cover comprises an upper cover body, a sealing ring, an adjusting frame and a lower cover body, a trigger is arranged on the upper cover body, trigger connecting shafts are arranged on the two sides of the trigger, two connecting shaft holes are formed in the upper cover body, the trigger connecting shafts are rotationally connected with the connecting shaft holes, and two adjusting shafts are fixedly arranged on the upper end face of the adjusting frame; the adjusting shaft is rotatably connected with the trigger connecting shaft, the trigger connecting shaft is used for driving the adjusting shaft to move in the vertical direction, and the sealing ring is located between the upper cover body and the adjusting frame, the structure is reasonable, the trigger drives the adjusting frame to move upwards, the adjusting frame drives the lower end of the sealing ring to move upwards, and therefore the sealing ring is compressed; and one side of the sealing ring protrudes outwards, so that the sealing ring is clamped on the inner wall of the tank body, and the heat preservation cover and the tank body cannot be separated.

Description

Technical Field

[0001] The invention relates to the field of heat-insulating containers, in particular to a heat-insulating tank with high sealing performance. Background Art

[0002] As people pay more attention to their health, more and more people start to bring lunch boxes to work or school. In particular, parents pay more attention to their children's health and cook for their children to take to school. In order to ensure that the food in the lunch box can maintain a certain temperature when used, an insulated lunch box, that is, an insulated can, is often used.

[0003] The insulation cover and the tank body of the existing insulation tank are often fixed by threads, and the threaded fixation requires the provision of threads on both the insulation cover and the tank body. When cleaning the insulation tank, impurities in the thread gap will be difficult to clean, and after the temperature inside the insulation tank drops, the pressure difference between the inside and outside of the insulation tank will make it difficult to open the lid of the insulation tank. Therefore, how to design a new insulation tank structure is a problem that has been under research and development at this stage. In response to the above problems, a solution is proposed below. Summary of the invention

[0004] The purpose of the present invention is to provide a highly sealed heat-insulating can which has the advantages of being easy to open and having a good heat-insulating effect.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A highly airtight heat preservation tank, comprising a tank body and a heat preservation cover, the heat preservation cover comprising an upper cover body, a sealing ring, an adjustment frame and a lower cover body, the upper cover body being provided with a trigger, the two sides of the trigger being provided with a trigger coupling, the upper cover body being provided with two coupling holes, one end of the trigger coupling being located in the coupling hole and being rotatably connected with the coupling hole, the upper end surface of the adjustment frame being fixed with two adjustment shafts, the upper ends of the two adjustment shafts passing through the coupling hole and being rotatably connected with the trigger coupling, the trigger coupling comprising a connecting portion on the same horizontal plane as the trigger and a connecting portion perpendicular to the trigger The cam is used to pull the adjusting frame, and the adjusting frame is used to drive the adjusting frame to move in the vertical direction. The sealing ring is located between the upper cover body and the adjusting frame. The upper end of the sealing ring is plugged and fixed with the lower end surface of the upper cover body, and the lower end of the sealing ring is clamped and fixed with the upper end surface of the adjusting frame. The lower cover body is fixed to the lower end surface of the adjusting frame, and the lower cover body is clamped and matched with the inner wall of the tank body. The trigger is a cam structure, and the adjusting frame is pulled by the cam to make the sealing ring expand or slide, thereby locking the tank body.

[0007] Preferably, the upper cover body includes an upper cover plate and an upper protective plate, the upper protective plate is fixed to the lower end surface of the upper cover plate, the lower end surface of the upper cover plate is provided with an upper mounting groove, the outer edge of the upper protective plate protrudes upward and is snap-fitted into the upper mounting groove, the lower end surface of the upper protective plate is provided with an outer ring groove and an inner ring groove, the upper end of the tank body is plug-fitted with the outer ring groove, and the upper end of the sealing ring is plug-fitted with the inner ring groove.

[0008] Preferably, the adjustment frame includes an adjustment plate and a base plate, the base plate is clamped and fixed on the lower end surface of the adjustment plate, a central axis is provided at the center of the lower end surface of the adjustment plate, and a plurality of spoke edges and annular edges are also provided on the lower end surface of the adjustment plate, the plurality of spoke edges are arranged around the central axis, and one end of the spoke edge is connected to the central axis, and the other end of the spoke edge extends to the outer edge position of the adjustment plate, the diameter of the annular edge is larger than the diameter of the central axis, the annular edge connects all the spoke edges, the spoke edges and annular edges are used to increase the firmness of the adjustment frame, a downwardly recessed abutment groove is provided on the outer edge of the upper end surface of the adjustment plate, and a horizontally arranged abutment ring is fixed at the lower end of the sealing ring, and the abutment ring abuts against the upper end surface of the abutment groove.

[0009] Preferably, a sealing ring is provided on the lower end surface of the lower cover body, the outer side of the sealing ring is arc-shaped, the outermost diameter of the sealing ring is smaller than the outermost diameter of the lower cover body, and a plurality of reinforcing edges are fixed on the lower end surface of the lower cover body, and the reinforcing edges are used to increase the strength of the lower cover body.

[0010] Preferably, the tank body comprises an outer tank body and an inner tank body, the inner wall of the outer tank body is provided with two circles of inwardly protruding clamping edges, the two clamping edges are respectively an upper clamping edge and a lower clamping edge, the inner circle diameter of the lower clamping edge is smaller than the inner circle diameter of the upper clamping edge, the upper end of the inner tank body is provided with a retaining ring folded outward, the outer diameter of the retaining ring is smaller than the inner circle diameter of the upper clamping edge, and the outer diameter of the retaining ring is larger than the inner circle diameter of the lower clamping edge.

[0011] Preferably, the outer tank body includes an outer shell and an inner shell, a partition is provided between the outer shell and the inner shell, the upper clamping edge and the lower clamping edge are both arranged on the inner shell, and the upper end of the outer shell is provided with a platform recessed inward, the height of the platform is the same as the height of the upper clamping edge, and the distance between the outer shell and the inner shell located above the platform is smaller than the distance between the outer shell and the inner shell located below the platform.

[0012] Preferably, the portion of the outer tank body located above the abutment platform is an inserting portion, the inserting portion of the outer tank body is plug-fitted with the outer ring groove, and the outermost lower end surface of the upper cover body abuts against the abutment platform.

[0013] Preferably, a storage groove is provided on the upper end surface of the upper cover body, and the storage groove is used to place tableware. A storage cover is provided on the storage groove, one side of the storage cover is hinged to the storage groove, and the other side of the storage cover is clamped and fixed to the storage groove.

[0014] Preferably, the upper cover body is further provided with a lifting ring, and the lifting ring is hingedly connected to the upper cover body.

[0015] Preferably, an annular gasket is embedded in the lower end surface of the outer shell, and the annular gasket is fixedly connected to the outer shell, and the lowermost end of the annular gasket is lower than the lowermost end of the outer shell.

[0016] The beneficial effects of the present invention are:

[0017] The traditional threaded connection is replaced by a snap-on connection, which reduces the difficulty in opening the insulation cover due to the pressure difference between the inside and outside of the tank;

[0018] The fixing between the tank body and the heat preservation cover relies on the cooperation between the upper clamping edge of the inner wall of the tank body and the sealing ring. When the sealing ring is compressed, the middle part of the sealing ring protrudes outward, and the protruding part of the sealing ring is located below the upper clamping edge, so that the heat preservation cover cannot be removed from the tank body; when the sealing ring is not compressed, the outer wall of the sealing ring will not contact the upper clamping edge, so that the heat preservation cover can be easily removed from the tank body;

[0019] The state of the sealing ring is adjusted by the adjustment frame. When the adjustment frame moves upward, the sealing ring will be compressed. When the adjustment frame moves back downward, the sealing ring will stretch. When the trigger drives the adjustment shaft to move, it will drive the adjustment frame to move. The trigger itself drives the adjustment shaft through a lever structure, so that the trigger can adjust the state of the sealing ring with less force. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment;

[0021] Figure 2 is a cross-sectional view of an embodiment;

[0022] Figure 3 is a cross-sectional view of a tank body of an embodiment;

[0023] Figure 4 is a cross-sectional view of a thermal insulation cover of an embodiment;

[0024] Figure 5 It is a structural schematic diagram of the upper cover body and the trigger of the embodiment;

[0025] Figure 6 It is a structural diagram of the connection between the adjusting frame and the trigger of the embodiment;

[0026] Figure 7 is a schematic structural diagram of a sealing ring in an embodiment;

[0027] Figure 8 It is a schematic structural diagram of the lower cover body of the embodiment.

[0028] 1. Insulation cover; 2. Outer tank body; 21. Upper clamping edge; 22. Lower clamping edge; 23. Outer shell; 24. Inner shell; 25. Butt platform; 26. Plug-in portion; 27. Annular pad; 3. Upper cover body; 31. Upper cover plate; 32. Upper protective plate; 33. Outer ring groove; 34. Inner ring groove; 35. Storage groove; 36. Storage cover; 37. Lifting ring; 4. Sealing ring; 41. Butt ring; 5. Adjustment frame; 51. Adjustment plate; 52. Bottom plate; 53. Adjustment shaft; 54. Center shaft; 55. Spoke edge; 56. Annular edge; 57. Butt groove; 6. Lower cover body; 61. Sealing ring; 62. Reinforcement edge; 7. Trigger; 71. Trigger coupling; 72. Coupling hole; 8. Inner tank body; 81. Retaining ring. DETAILED DESCRIPTION

[0029] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. The same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0030] like Figures 1 to 8 As shown, a highly sealed heat preservation can comprises a can body and a heat preservation cover 1. The can body comprises an outer can body 2 and an inner can body 8. The inner wall of the outer can body 2 is provided with two circles of clamping edges protruding inward, and the two clamping edges are respectively an upper clamping edge 21 and a lower clamping edge 22. The inner circle diameter of the lower clamping edge 22 is smaller than the inner circle diameter of the upper clamping edge 21. The upper end of the inner can body 8 is provided with a retaining ring 81 folded outward, and the outer diameter of the retaining ring 81 is smaller than the inner circle diameter of the upper clamping edge 21, and the outer diameter of the retaining ring 81 is larger than the inner circle diameter of the lower clamping edge 22. The inner can body 8 can pass through the upper clamping edge 21 and be clamped above the lower clamping edge 22. The inner can body 8 and the outer can body 2 can be used to store unused food.

[0031] The outer tank body 2 includes an outer shell 23 and an inner shell 24, and a partition is provided between the outer shell 23 and the inner shell 24. In this design, the partition is not filled with objects, but is an air layer, which can effectively reduce the overall weight of the outer tank body 2. Objects can also be filled in the partition as needed to increase the thermal insulation performance of the outer tank body 2.

[0032] An annular pad 27 is embedded in the lower end surface of the outer shell 23, and the lowermost end of the annular pad 27 is lower than the lowermost end of the outer shell 23. The annular pad 27 is made of a heat-insulating and elastic material, such as rubber, which can reduce the collision between the outer shell 23 and external objects such as the desktop, thereby extending the service life of the insulation tank.

[0033] The heat preservation cover 1 includes an upper cover body 3, a sealing ring 4, an adjustment frame 5 and a lower cover body 6. The upper cover body 3 includes an upper cover plate 31 and an upper protective plate 32. The lower end surface of the upper cover plate 31 is provided with an upper mounting groove. The outer edge of the upper protective plate 32 protrudes upward and is clamped in the upper mounting groove, so that the upper protective plate 32 is fixed to the upper cover plate 31. In order to enhance the connection firmness between the upper protective plate 32 and the upper cover plate 31, a plurality of clamping columns protruding downward are provided on the lower end surface of the upper cover plate 31, and a plurality of clamping holes are provided at corresponding positions of the upper protective plate 32. The plurality of clamping columns are respectively inserted into the plurality of clamping holes, and the clamping columns are fixed by being inserted into the clamping holes.

[0034] An outer annular groove 33 and an inner annular groove 34 are provided on the lower end surface of the upper protection plate 32 . The outer annular groove 33 is plug-fitted with the upper end of the tank body, and the upper end of the sealing ring 4 is plugged into the inner annular groove 34 .

[0035] The adjustment frame 5 includes an adjustment plate 51 and a bottom plate 52, and the bottom plate 52 is fixed to the lower end surface of the adjustment plate 51 by clamping. A central axis 54 is provided at the center of the lower end surface of the adjustment plate 51, and a plurality of spoke edges 55 and an annular edge 56 are also provided on the lower end surface of the adjustment plate 51. The plurality of spoke edges 55 are arranged around the central axis 54, and one end of the spoke edge 55 is connected to the central axis 54, and the other end of the spoke edge 55 extends to the outer edge position of the adjustment plate 51, and the annular edge 56 connects the plurality of spoke edges 55. The spoke edges 55 and the annular edge 56 can increase the firmness of the adjustment frame 5, and make a certain distance between the bottom plate 52 and the adjustment plate 51, so as to enhance the thermal insulation performance of the thermal insulation cover 1.

[0036] A downwardly recessed groove 57 is provided at the outer edge of the upper end surface of the adjustment plate 51 , and a horizontally arranged retaining ring 41 is fixed to the lower end of the sealing ring 4 , and the retaining ring 41 is tightly fitted in the retaining groove 57 .

[0037] The upper cover body 3 is provided with a trigger 7, and trigger 7 couplings are provided on both sides of the trigger 7. Two coupling holes 72 are provided on the upper cover body 3, and one end of the trigger 7 coupling is located in the coupling hole 72 and is rotatably connected to the coupling hole 72. Two adjustment shafts 53 are fixedly provided on the upper end surface of the adjustment frame 5, and the upper ends of the two adjustment shafts 53 pass through the coupling hole 72. A horizontally arranged cylinder is fixedly provided on the adjustment shaft 53, and a cylindrical groove is provided on the trigger 7 coupling. The cylinder on the adjustment shaft 53 is clamped in the cylindrical groove, so that the trigger 7 coupling and the adjustment shaft 53 are rotatably connected.

[0038] The trigger 7 is a cam structure. The trigger 7 pulls the adjustment frame 5 through the cam to expand or slide the sealing ring 4, thereby locking the tank body 1. The trigger 7 coupling includes a connecting portion on the same horizontal plane as the trigger 7 and a raised portion perpendicular to the trigger 7. The adjustment shaft 53 is connected to the intersection of the raised portion and the connecting portion of the trigger 7 coupling. When the trigger 7 is in a vertical state perpendicular to the heat preservation cover 1, it is in an open state; when the trigger 7 is in a horizontal state attached to the surface of the heat preservation cover 1, it is in a closed state. When the trigger 7 rotates from the open state to the closed state, the raised portion of the trigger 7 coupling will abut against the upper end surface of the upper cover body 3. During the continuous rotation of the trigger 7, the intersection of the raised portion and the connecting portion of the trigger 7 coupling will move upward until the trigger 7 is completely rotated to a state of being attached to the heat preservation cover 1. At this time, the intersection of the raised portion and the connecting portion of the trigger 7 coupling moves to the highest point, and the trigger 7 is transformed into a closed state.

[0039] When the trigger 7 changes from the open state to the closed state, the trigger 7 connecting shaft will drive the adjustment shaft 53 to move upward, and the adjustment shaft 53 will drive the adjustment frame 5 to move upward. After the adjustment frame 5 moves upward from the initial position, it will drive the lower end surface of the sealing ring 4 to move upward, and the upper end of the sealing ring 4 will not move, so the sealing ring 4 will be compressed. Since the lower end of the sealing ring 4 is inclined outward, when compressed, the sealing ring 4 will protrude outward, increasing the outermost diameter of the sealing ring 4. After the heat preservation cover 1 is covered on the tank body, the part of the sealing ring 4 exposed below the inner ring groove 34 is located below the upper clamping edge 21. When the sealing ring 4 is compressed, the part of the sealing ring 4 protruding outward is also located below the upper clamping edge 21 and is tightly attached to the lower side of the upper clamping edge 21. The outermost diameter of the compressed sealing ring 4 is larger than the inner diameter of the upper clamping edge 21, so the sealing ring 4 cannot pass through the upper clamping edge 21, thereby fixing the heat preservation cover 1 to the tank body.

[0040] When the heat preservation cover 1 needs to be removed from the tank body, the trigger 7 only needs to be turned to change the trigger 7 from the closed state to the open state. The sealing ring 4 in the open state will not be compressed, that is, it will not contact the upper clamping edge 21. In this design, the sealing ring 4 is made of silicone material, which can be used for a long time without aging and has good sealing performance.

[0041] The upper end of the outer shell 23 is provided with a buttress 25 that is recessed inward, and the height of the buttress 25 is the same as the height of the upper clamping edge 21. The portion of the outer tank 2 located above the buttress 25 is the plug-in portion 26, and the lateral width of the plug-in portion 26 is smaller than the lateral width of the rest of the outer tank 2, so that the plug-in portion 26 can be plugged into the outer ring groove 33, and the side wall of the outer ring groove 33, that is, the lower end surface of the outermost part of the upper cover plate 31, will butt against the buttress 25. The buttress 25 and the plug-in portion 26 of the outer shell 23 can both locate the relative position between the two after the thermal insulation cover 1 is covered on the tank body, so that the thermal insulation cover 1 can better achieve thermal insulation of the tank body.

[0042] The lower cover 6 is fixed to the lower end surface of the adjustment frame 5 by snap connection. The lower end surface of the lower cover 6 is fixed with a plurality of reinforcing edges 62, which can increase the strength of the lower cover 6. The lower end surface of the lower cover 6 is provided with a circle of sealing ring 61, the outer side of the sealing ring 61 is arc-shaped, and the outermost diameter of the sealing ring 61 is smaller than the outermost diameter of the lower cover 6. The sealing ring 61 can be inserted into the inner tank 8, and the lower cover 6 will abut against the upper end surface of the inner tank 8 to prevent the food in the inner tank 8 from mixing with the food in the outer tank 2.

[0043] In order to prevent the tank body from being damaged due to excessive air pressure inside the tank body, an overpressure protection structure can be further arranged on the central axis 54 of the adjusting frame 5, which is similar to the pressure relief valve of a pressure cooker. A through hole is opened on the central axis 54, and a block is arranged in the through hole. When the air pressure inside the tank body is too high, the air pressure inside the tank body will push the block to move upward, so that the gas inside the tank body can pass through the through hole and flow out from the connection between the sealing ring 4 and the inner ring groove 34 to relieve the pressure.

[0044] A storage groove 35 is provided on the upper end surface of the upper cover body 3, and the storage groove 35 can be used to place tableware or small snacks, etc. A storage cover 36 is provided on the storage groove 35, one side of the storage cover 36 is hinged to the storage groove 35, and the other side of the storage cover 36 is clamped and fixed to the storage groove 35. When the storage cover 36 covers the storage groove 35, it can prevent objects in the storage groove 35 from falling.

[0045] The upper cover body 3 is also provided with a lifting ring 37, which is hingedly connected to the upper cover body 3. After the lifting ring 37 is erected, the insulation can can be carried in a lifting manner, making the insulation can more convenient to carry.

[0046] Each structure in the present invention can be completely separated, and each part of the heat preservation cover can be disassembled for cleaning.

[0047] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly airtight heat-insulating tank, comprising a tank body and a heat-insulating cover (1), characterized in that: The heat-insulating cover (1) comprises an upper cover body (3), a sealing ring (4), an adjustment frame (5) and a lower cover body (6); a trigger (7) is provided on the upper cover body (3); trigger (7) couplings are provided on both sides of the trigger (7); two coupling holes (72) are provided on the upper cover body (3); one end of the trigger (7) coupling is located in the coupling hole (72) and is rotatably connected to the coupling hole (72); two adjustment shafts (53) are fixedly provided on the upper end surface of the adjustment frame (5); the upper ends of the two adjustment shafts (53) pass through the coupling hole (72) and are rotatably connected to the trigger (7) coupling; the trigger (7) coupling comprises a connecting portion on the same horizontal plane as the trigger (7) and a protrusion perpendicular to the trigger (7). The adjusting shaft (53) is connected to the intersection of the raised part and the connecting part of the trigger (7) connecting shaft. The trigger (7) connecting shaft is used to drive the adjusting shaft (53) to move in the vertical direction. The sealing ring (4) is located between the upper cover body (3) and the adjusting frame (5). The upper end of the sealing ring (4) is plugged and fixed to the lower end surface of the upper cover body (3). The lower end of the sealing ring (4) is snap-fitted and fixed to the upper end surface of the adjusting frame (5). The lower cover body (6) is fixed to the lower end surface of the adjusting frame (5). The lower cover body (6) is snap-fitted with the inner wall of the tank body. The trigger (7) is a cam structure. The trigger (7) pulls the adjusting frame (5) through the cam to make the sealing ring (4) expand or slide, thereby locking the tank body (1).

2. A highly airtight heat preservation tank according to claim 1, characterized in that: The upper cover body (3) comprises an upper cover plate (31) and an upper protective plate (32); the upper protective plate (32) is fixed to the lower end surface of the upper cover plate (31); the lower end surface of the upper cover plate (31) is provided with an upper mounting groove; the outer edge of the upper protective plate (32) protrudes upward and is snap-fitted into the upper mounting groove; the lower end surface of the upper protective plate (32) is provided with an outer ring groove (33) and an inner ring groove (34); the upper end of the tank body is plug-fitted with the outer ring groove (33); and the upper end of the sealing ring (4) is plug-fitted with the inner ring groove (34).

3. A highly airtight heat preservation tank according to claim 2, characterized in that: The adjustment frame (5) comprises an adjustment plate (51) and a bottom plate (52), wherein the bottom plate (52) is clamped and fixed to the lower end surface of the adjustment plate (51), a central axis (54) is provided at the center of the lower end surface of the adjustment plate (51), and a plurality of spoke edges (55) and annular edges (56) are also provided on the lower end surface of the adjustment plate (51), wherein the plurality of spoke edges (55) are arranged around the central axis (54), and one end of the spoke edge (55) is connected to the central axis (54), and the other end of the spoke edge (55) extends At the outer edge of the adjustment plate (51), the diameter of the annular ridge (56) is greater than the diameter of the central axis (54), the annular ridge (56) connects all the spoke ridges (55), the spoke ridges (55) and the annular ridge (56) are used to increase the firmness of the adjustment frame (5), the outer edge of the upper end surface of the adjustment plate (51) is provided with a downwardly recessed abutment groove (57), the lower end of the sealing ring (4) is fixedly provided with a horizontally arranged abutment ring (41), and the abutment ring (41) abuts against the upper end surface of the abutment groove (57).

4. A highly airtight heat preservation tank according to claim 3, characterized in that: The lower end surface of the lower cover body (6) is provided with a circle of sealing ring (61), the outer side of the sealing ring (61) is arc-shaped, the outermost diameter of the sealing ring (61) is smaller than the outermost diameter of the lower cover body (6), and the lower end surface of the lower cover body (6) is fixedly provided with a plurality of reinforcing edges (62), and the reinforcing edges (62) are used to increase the strength of the lower cover body (6).

5. A highly airtight heat preservation tank according to claim 4, characterized in that: The tank body comprises an outer tank body (2) and an inner tank body (8). The inner wall of the outer tank body (2) is provided with two circles of inwardly protruding clamping edges, the two clamping edges being respectively an upper clamping edge (21) and a lower clamping edge (22). The inner circle diameter of the lower clamping edge (22) is smaller than the inner circle diameter of the upper clamping edge (21). The upper end of the inner tank body (8) is provided with a retaining ring (81) folded outwardly. The outer diameter of the retaining ring (81) is smaller than the inner circle diameter of the upper clamping edge (21), and the outer diameter of the retaining ring (81) is larger than the inner circle diameter of the lower clamping edge (22).

6. A highly airtight heat preservation tank according to claim 5, characterized in that: The outer tank body (2) comprises an outer shell (23) and an inner shell (24), a partition is provided between the outer shell (23) and the inner shell (24), the upper clamping edge (21) and the lower clamping edge (22) are both arranged on the inner shell (24), the upper end of the outer shell (23) is provided with a stop (25) recessed inwardly, the height of the stop (25) is the same as the height of the upper clamping edge (21), and the distance between the outer shell (23) located above the stop (25) and the inner shell (24) is smaller than the distance between the outer shell (23) and the inner shell (24) located below the stop (25).

7. A highly airtight heat preservation tank according to claim 6, characterized in that: The portion of the outer tank body (2) located above the abutment platform (25) is the insertion portion (26), the insertion portion (26) of the outer tank body (2) is plugged into and matched with the outer ring groove (33), and the outermost lower end surface of the upper cover body (3) abuts against the abutment platform (25).

8. The highly airtight heat preservation tank according to claim 1, characterized in that: The upper end surface of the upper cover body (3) is provided with a storage groove (35), the storage groove (35) is used to place tableware, and the storage groove (35) is provided with a storage cover (36), one side of the storage cover (36) is hinged to the storage groove (35), and the other side of the storage cover (36) is clamped and fixed to the storage groove (35).

9. The highly airtight heat preservation tank according to claim 1, characterized in that: The upper cover body (3) is also provided with a lifting ring (37), and the lifting ring (37) is hingedly connected to the upper cover body (3).

10. The highly airtight heat preservation tank according to claim 5, characterized in that: An annular gasket (27) is embedded in the lower end surface of the outer shell (23), and the annular gasket (27) is fixedly connected to the outer shell (23), and the lowermost end of the annular gasket (27) is lower than the lowermost end of the outer shell (23).

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