Lunch box

Abstract

The utility model discloses a lunch box which comprises a cover body, a containing box and a base, fasteners are respectively arranged on two opposite sides of the cover body in a rotating mode, lock catch devices are respectively arranged on the other two opposite sides of the cover body in a rotating mode, an opening is formed in the top face of the containing box, a first lock catch portion is arranged on the periphery of the top of the containing box, and the cover body covers the top of the containing box. The locking device and the first locking part are locked, the cover body seals the opening, the cover body and the containing box are connected into a whole, a concave cavity is formed in the top of the base, a second locking part is arranged on the periphery of the top of the base, the cover body and the containing box are placed in the concave cavity together, the fastening piece and the second locking part are locked, and the containing box is fixed in the base through the cover body. The cover body can be fixedly connected with the containing box and the base at the same time, compared with the prior art, one cover body is omitted, the structure is simpler, and use and operation are more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to lunch box technical field. BACKGROUND

[0002] At present, the market heat preservation lunch box, through setting up heat preservation layer on heat preservation box body and heat preservation cover body respectively, and then ensuring that the food temperature in the cavity after heat preservation box body and heat preservation cover body cover is basically unchanged within a certain time. This kind of heat preservation lunch box is directly placed into the refrigerator, and the refrigerator cannot directly refrigerate the food in the cavity due to the interference of the heat preservation layer.

[0003] The heat preservation lunch box is improved, and a detachable fresh-keeping box is arranged in the cavity. The fresh-keeping box separately has a fresh-keeping box body and a fresh-keeping cover body. The heat preservation lunch box with the structure can take out the fresh-keeping box and place it in the refrigerator for refrigeration. However, the two cover bodies of the fresh-keeping cover body and the heat preservation cover body exist simultaneously, which increases the product mold manufacturing cost and is not convenient for user operation. Moreover, when a heating device is arranged in the heat preservation box body to improve the heat preservation effect, the gas in the fresh-keeping box body cannot be discharged due to the two cover bodies of the fresh-keeping cover body and the heat preservation cover body, the fresh-keeping cover body needs to be taken out, and the heat preservation cover body is also easy to contact the food. The fresh-keeping cover body and the heat preservation cover body need to be cleaned during use. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a lunch box which is simpler to operate and has fewer components.

[0005] The utility model achieves the purpose by the following means.

[0006] A lunch box comprises a cover body, a containing box and a base, two opposite sides of the cover body are respectively provided with buckling members, the other two opposite sides of the cover body are respectively provided with locking devices, the containing box is provided with an open top, the top of the containing box is provided with a first locking part, the cover body covers the top of the containing box, the locking devices and the first locking part are locked, the cover body closes the open top, the cover body and the containing box are connected into an integrated whole, the base is provided with a concave cavity on the top, the base is provided with a second locking part on the outer periphery of the top, the containing box is placed in the concave cavity, the cover body is seated on the top of the base, the buckling members and the second locking part are locked, and the cover body fixes the containing box in the base.

[0007] The cover body of the utility model can be connected and fixed with the containing box and the base at the same time, one cover body is reduced compared with the prior art, the structure is simpler, and the operation is more convenient.

[0008] Further, the cover bottom is provided with a boss, an annular groove is formed between the boss and the cover edge side wall, the lock catch device is provided with an unlocking portion on the cover top surface, the lock catch device is provided with a locking portion in the annular groove, the locking portion has a tendency to move towards the boss, the container box top portion is inserted into the annular groove, the locking portion limits the first lock catch portion in the clamping clamping position between the locking portion and the boss from the vertical and horizontal directions, when the unlocking portion drives the locking portion to move away from the boss, the locking portion is separated from the clamping clamping position, and the cover is separated from the container box.

[0009] The cover and the container box have simple connection structure and easy assembly and disassembly.

[0010] Further, the two lock catch devices are symmetrically arranged left and right, the lock catch device comprises a lock catch body and a spring, a sliding groove is arranged in the cover, the lock catch body is slidingly arranged in the sliding groove, the spring is arranged in the sliding groove, the outer end of the spring abuts against the sliding groove side wall, the inner end of the spring abuts against the lock catch body, the spring force of the spring drives the lock catch body to move towards the boss, the outer end of the lock catch body extends out of the locking portion, the locking portion is in the shape of a hook, the cover bottom is provided with a limiting groove in communication with the sliding groove, the top of the lock catch body is provided with the unlocking portion, and the unlocking portion moves in the limiting groove.

[0011] The lock catch device has reasonable structure design and stable and reliable operation.

[0012] Further, the boss is provided with a fixed groove on the side facing the annular groove, a first sealing ring is arranged in the fixed groove, the outer side of the first sealing ring extends into the annular groove, the locking portion abuts against the first sealing ring, the top of the container box is provided with a skirt, and the skirt forms the first lock catch portion; when the top of the container box is inserted into the clamping clamping position, the locking portion and the boss clamp the skirt, the locking portion hooks the bottom surface of the skirt, the boss and the first sealing ring are relatively inserted into the open mouth, and the boss abuts against the inner side wall of the container box through the first sealing ring.

[0013] The locking portion contacts the sealing ring, noise generated by the locking portion returning is reduced, and the locking portion and the locking portion are matched, so that the connection is firm.

[0014] Further, the locking portion is provided with a guide inclined surface corresponding to the clamping clamping position, the top surface of the skirt is provided with an ejection portion near the edge, the top surface edge of the skirt is provided with a lower concave portion, the bottom surface of the skirt is provided with a lower convex portion, the lower convex portion is provided with an arc abutting surface, the ejection portion is inserted between the locking portion and the first sealing ring, so that the spacing of the clamping clamping position is expanded, until the corner of the lower concave portion abuts against the guide inclined surface, the lower concave portion is continuously moved upwards to further expand the spacing of the clamping clamping position, until the locking portion contacts the arc abutting surface, and the locking portion slides over the arc abutting surface to support the bottom surface of the lower convex portion.

[0015] The skirt structure design facilitates the insertion of the skirt into the clamping clamping position and saves labor.

[0016] Further, the cover comprises an upper cover and a lower cover, the lower cover is fixed on the bottom surface of the upper cover, the lower cover forms the boss, and the lower cover is inserted into the container box.

[0017] Further, the upper cover and the lower cover form a hollow sealing interlayer, the cover body is provided with an air extraction valve corresponding to the sealing interlayer, the air in the sealing interlayer is extracted by the air extraction valve, the vacuum degree in the sealing interlayer is adjustable, and the cover body serves as a heat preservation cover body.

[0018] The cover body has a heat preservation function, the heat preservation effect after the cover body is connected with the base is improved, the cover body is used in cooperation with the containing box, and cold storage is realized by using the containing box.

[0019] Further, the air extraction valve comprises a pressing plug, a second sealing ring and a compression spring, the lower cover is provided with a fixing position and a limiting guide column on the top surface, the pressing plug is provided with a convex edge on the outer periphery, the convex edge is provided with a guide hole, the pressing plug is sleeved on the limiting guide column through the guide hole, the limiting guide column is provided with a limiting piece at the top to limit the pressing plug from being separated from the limiting guide column, the compression spring is abutted by the fixing position at the bottom, the compression spring is abutted by the bottom of the pressing plug at the top, the upper cover is provided with a gas guide hole, the bottom side of the gas guide hole is provided with a gas guide channel in communication with the sealing interlayer, the top of the pressing plug is inserted into the gas guide hole, the second sealing ring is arranged on the outer periphery of the top of the pressing plug, the pressing plug is pushed upward by the elastic force of the compression spring, the convex edge of the pressing plug is abutted by the limiting piece or the bottom surface of the gas guide hole, at this time, the second sealing ring is moved to above the gas guide channel, the second sealing ring and the gas guide hole are sealed to block the communication between the sealing interlayer and the outside, and when an external force presses the pressing plug until the second sealing ring is moved to below the gas guide channel, the sealing interlayer is communicated with the gas guide hole through the gas guide channel.

[0020] The compression spring avoids that the pressing plug is moved downward due to negative pressure and causes the sealing interlayer to take in air.

[0021] Further, the cover body is provided with a pressure relief valve, the lower cover is provided with a first pressure relief hole, the lower cover is provided with a third sealing ring around the first pressure relief hole, the bottom surface of the upper cover extends downward and is provided with an annular enclosing wall, the annular enclosing wall is provided with a second pressure relief hole, after the upper cover and the lower cover are connected, the annular enclosing wall is abutted and sealed by the third sealing ring, the first pressure relief hole and the second pressure relief hole are communicated, the pressure relief valve is movably arranged in the second pressure relief hole, and the bottom of the pressure relief valve is inserted into the first pressure relief hole.

[0022] The gas in the containing box is easily discharged through the first pressure relief hole and the second pressure relief hole. The third sealing ring avoids that the gas enters the sealing interlayer through the first pressure relief hole and the second pressure relief hole.

[0023] Further, the base is provided with a heating device, when the containing box is placed in the recess, the heating device is used for heating the containing box, and the bottom surface of the skirt edge at the top of the containing box is higher than the top surface of the base.

[0024] The skirt edge is convenient for being connected and fixed with the cover body. The heating device improves the heat preservation effect of the base on the containing box.

[0025] Further, the top surface of the cover is provided with a U-shaped handle and a U-shaped groove, two ends of the U-shaped handle and the U-shaped groove are rotationally connected, the bottom of the U-shaped handle is provided with a recess, the U-shaped handle is upwardly rotated to abut against the U-shaped groove, the U-shaped handle is rearwardly inclined, and the recess and the middle part of the U-shaped groove form a mobile phone fixing position.

[0026] The cover can also be used as a mobile phone support.

[0027] Further, the top of the cover is provided with a tableware recess, and the cover is provided with a turnover cover corresponding to the tableware recess.

[0028] Tableware can be placed in the tableware recess, and the user can conveniently use the tableware.

[0029] Further, the fastening part is a U-shaped buckle ring, two ends of the U-shaped buckle ring are rotationally connected with the cover, the side surface of the base is provided with a convex buckle, the convex buckle forms the second locking part, and the U-shaped buckle ring is rotationally connected with the convex buckle through buckle connection.

[0030] The cover and the base are connected in a simple structure, and the disassembly and assembly operation is easy.

[0031] The cover of the utility model can be connected and fixed with the containing box or the base alone, or can be connected and fixed with the containing box and the base simultaneously, compared with the prior art, one cover is reduced, the structure is simpler, and the operation is more convenient. The cover is provided with a pressure relief valve, and the gas in the containing box can be directly discharged to the outside. The cover controls the vacuum degree of the sealed interlayer through the air extraction valve, and then adjusts the heat preservation effect of the cover. The cover also has the functions of tableware containing and mobile phone support. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic view of a mobile phone in a placing and using state of an embodiment one.

[0033] Figure 2 It is a top view of the embodiment one.

[0034] Figure 3 It is Figure 2 It is a sectional view of a part in the direction of A-A.

[0035] Figure 4 It is Figure 2 It is a sectional view of a part in the direction of B-B.

[0036] Figure 5 It is an exploded structural schematic view of the cover in the embodiment one.

[0037] Figure 6 It is a structural schematic view of the bottom of the cover in the embodiment one.

[0038] Figure 7 It is a sectional structural schematic view of the cover in the embodiment one.

[0039] Figure 8Figure 1 is a schematic view of the mounting structure of the cover and the container box in Example 1.

[0040] Figure 9 Figure 2 is a schematic view of the structure of the container box placed in the base in Example 1. DETAILED DESCRIPTION

[0041] The utility model will be further described in connection with the drawings and examples.

[0042] Example 1, referring to Figures 1-9 Figure 1 is a schematic view of the mounting structure of the cover and the container box in Example 1.

[0043] The cover 1 is rotatably provided with a fastening member 4 on each of the opposite sides, and the fastening member 4 is a N-shaped buckle 41, the two ends of which are rotatably connected to the cover 1 by a pivot. The cover 1 is provided with a locking device 5 on each of the other opposite sides. The two locking devices 5 are symmetrically arranged. The bottom surface of the cover 1 is provided with a boss 13, and an annular groove 15 is formed between the boss 13 and the edge side wall of the cover 1. The locking device 5 is provided with an unlocking portion 52 on the top surface of the cover 1, and the locking device 5 is provided with a locking portion 51 in the annular groove 15. The locking portion 51 has a tendency to move towards the boss 13, and a clamping stop 50 is formed between the locking portion 51 and the boss 13.

[0044] The locking device 5 comprises a locking body 53 and a spring 54. The cover 1 is provided with a sliding groove 16, and the locking body 53 is slidingly arranged in the sliding groove 16. The spring 54 is arranged in the sliding groove 16, and the outer end of the spring 54 abuts against the side wall of the sliding groove 16, and the inner end of the spring 54 abuts against the locking body 53. The spring 54 pushes the locking body 53 to move towards the boss 13, and the outer end of the locking body 53 extends out of the locking portion 51, which is in the shape of a hook. The bottom surface of the cover 1 is provided with a limiting groove 17 communicating with the sliding groove 16, and the top of the locking body 53 extends out of the unlocking portion 52, which moves in the limiting groove 17. Preferably, a push button 56 is connected to the unlocking portion 52, which facilitates the user to move the unlocking portion 52. The length of the locking body 53 is greater than the length of the limiting groove 17, so as to avoid the locking body 53 from being separated from the limiting groove 17.

[0045] The boss is provided with a fixing groove 18 on the side facing the annular groove 15, and the fixing groove 18 is provided with a first sealing ring 19, which extends to the annular groove 15 on the outer side, and the locking portion 51 abuts against the first sealing ring 19. The locking portion 51 is provided with a guide inclined surface 55 corresponding to the clamping stop 50.

[0046] In the embodiment, the cover 1 comprises an upper cover 11 and a lower cover 12. The lower cover 12 is fixed on the bottom surface of the upper cover 11, and the lower cover 12 forms the boss 13 and is inserted into the accommodating box 2. The hollow sealing interlayer 14 is formed between the upper cover 11 and the lower cover 12, the cover 1 is provided with the air extraction valve 6 corresponding to the sealing interlayer 14, the air in the sealing interlayer 14 is extracted by the air extraction valve 6, the vacuum degree in the sealing interlayer 14 is adjustable, and the cover 1 serves as a heat preservation cover 1. The bottom of the upper cover 11 is provided with the sliding groove 16, and the lower cover 12 blocks part of the sliding groove 16 after being connected with the upper cover 11, so that the locking buckle device 5 is prevented from being separated from the sliding groove 16, and the locking part 51 extends from the space between the lower cover 12 and the upper cover 11.

[0047] The air extraction valve 6 comprises a pressing plug 61, a second sealing ring 62 and a compression spring 63. The top surface of the lower cover 12 is provided with a fixing position 121 and a limiting guide column 122. The outer periphery of the pressing plug 61 is provided with a convex edge 64, and the convex edge 64 is provided with a guide hole 65. The pressing plug 61 is sleeved on the limiting guide column 122 through the guide hole 65. The top of the limiting guide column 122 is provided with a limiting part 123 (such as a cap screw) for limiting the pressing plug 61 from being separated from the limiting guide column 122. The bottom of the compression spring 63 abuts against the fixing position 121, and the top of the compression spring 63 abuts against the bottom of the pressing plug 61. The upper cover 11 is provided with a gas guide hole 111. The side surface of the bottom of the gas guide hole 111 is provided with a gas guide channel 112 which is in communication with the sealing interlayer 14. The top of the pressing plug 61 is inserted into the gas guide hole 111. The second sealing ring 62 is arranged on the outer periphery of the top of the pressing plug 61. The pressing plug 61 is pushed upward by the elastic force of the compression spring 63, and the convex edge 64 of the pressing plug 61 abuts against the limiting part 123 or the bottom surface of the gas guide hole 111. At this time, the second sealing ring 62 is moved to above the gas guide channel 112, and the second sealing ring 62 and the gas guide hole 111 are sealed to block the communication between the sealing interlayer 14 and the outside. When the pressing plug 61 is pressed downward by an external force until the second sealing ring 62 is moved to below the gas guide channel 112, the sealing interlayer 14 is in communication with the gas guide hole 111 through the gas guide channel 112.

[0048] The cover body 1 is provided with a pressure relief valve 7, the lower cover 12 is provided with a first pressure relief hole 124, the lower cover 12 is provided with a third sealing ring 125 around the first pressure relief hole 124, the upper cover 11 is provided with an annular wall 113 extending downward from the bottom surface, the annular wall 113 is provided with a second pressure relief hole 114, the annular wall 113 and the third sealing ring 125 are in abutting sealing connection after the upper cover 11 and the lower cover 12 are connected, the first pressure relief hole 124 and the second pressure relief hole 114 are in communication, the pressure relief valve 7 is movably arranged in the second pressure relief hole 114, and the bottom of the pressure relief valve 7 is inserted into the first pressure relief hole 124. In the embodiment, the upper part of the pressure relief valve 7 is arranged in the second pressure relief hole 114, and a gap is left in the circumferential direction, the lower part of the pressure relief valve 7 includes two sections with different diameters, the first fitting section 71 is in radial interference fit with the first pressure relief hole 124, and the second fitting section 72 is in radial clearance fit with the first pressure relief hole 124, when the first fitting section 71 is in interference fit with the first pressure relief hole 124, the pressure relief valve 7 seals the second pressure relief hole 114, when the second fitting section 72 is in clearance fit with the first pressure relief hole 124, the pressure relief valve 7 and the second pressure relief hole 114 are in clearance exhaust. The pressure relief valve 7 is made of silica gel, the second fitting section 72 and the first pressure relief hole 124 are in radial elastic snap fit, and the pressure relief valve 7 is prevented from being separated from the cover body 1.

[0049] The top surface of the upper cover 11 is provided with a U-shaped handle 8 and a U-shaped groove 115, the two ends of the U-shaped handle 8 are rotatably connected with the two ends of the U-shaped groove 115, the bottom of the U-shaped handle 8 is provided with a recess 81, the U-shaped handle 8 is upwardly rotated to abut against the connection angle between the U-shaped groove 115 and the top surface of the upper cover 11, the U-shaped handle 8 is rearwardly inclined, and the recess 81 and the middle part of the U-shaped groove 115 constitute a mobile phone fixing position 121.

[0050] The top surface of the upper cover 11 is provided with a tableware recess 116, and the cover body 1 is provided with a turnover cover 117 corresponding to the tableware recess 116.

[0051] The top surface of the accommodating box 2 is provided with an open hole, and the top portion of the accommodating box 2 is provided with a first locking portion. Specifically, the top portion of the accommodating box 2 is outwardly provided with a skirt 20, and the skirt 20 constitutes the first locking portion. In the embodiment, the accommodating box 2 is made of glass, ceramic or metal. Preferably, the accommodating box 2 is made of stainless steel. The top surface of the skirt 20 is provided with an ejection portion 21 near the edge, the edge of the top surface of the skirt 20 is provided with a lower recess 22, the bottom surface of the skirt 20 is provided with a lower protrusion 23, and the lower protrusion 23 is provided with an arc-shaped abutting surface 24. The skirt 20 is formed on the top surface of the accommodating box 2 by stamping and bending.

[0052] When the top of the container 2 is inserted into the annular groove 15, that is, the top of the container 2 is inserted into the clamping stop 50, the locking portion 51 and the boss 13 clamp the skirt 20, and the locking portion 51 hooks the bottom surface of the skirt 20, the boss 13 and the first sealing ring 19 are inserted into the open mouth, and the boss 13 abuts against the inner side wall of the container 2 through the first sealing ring 19. Specifically, the ejection portion 21 is inserted between the locking portion 51 and the first sealing ring 19, so as to expand the spacing of the clamping stop 50, until the lower recess 22 corner abuts against the guide inclined surface 55, the lower recess 22 continues to expand the spacing of the clamping stop 50, until the locking portion 51 contacts the arc abutting surface 24, and the locking portion 51 slides through the arc abutting surface 24 to support the bottom surface of the lower convex portion 23. In this way, the locking portion 51 limits the first locking portion in the clamping stop 50 between the locking portion 51 and the boss 13 from two directions of vertical and horizontal directions, and when the unlocking portion 52 drives the locking portion 51 to move away from the boss 13, the locking portion 51 is separated from the clamping stop 50, and the cover 1 is separated from the container 2.

[0053] When the cover 1 is covered on the top of the container 2, the locking device 5 and the first locking portion are locked, the cover 1 seals the open mouth, the cover 1 and the container 2 are connected into an integrated body, and the cover 1 and the container 2 can be used as a fresh-keeping box by being matched separately, that is, the cover 1 and the container 2 can be directly placed in a refrigerator for refrigeration or freezing, and mainly heat conduction is performed through the container 2. The cover 1 adjusts the heat conduction effect according to whether the cover 1 is vacuumized, that is, the better the heat conduction effect is, the worse the heat preservation effect is, and vice versa.

[0054] The base 3 is provided with a convex buckle 31 on both sides, and the convex buckle 31 constitutes the second locking portion. The base 3 is provided with a concave cavity 30 on the top, and the base 3 is provided with a heating device corresponding to the concave cavity 30, which is used for heating the container 2 when the container 2 is placed in the concave cavity 30, and the bottom surface of the skirt 20 on the top of the container 2 is higher than the top surface of the base 3. The base 3 is provided with a battery and a control circuit, and the battery, the control circuit and the heating device are electrically connected, so that the heating device 32 can heat the container 2 to realize cooking or improve the heat preservation effect. Preferably, the base 3 is provided with a heat preservation layer corresponding to the heating device 32 and the concave cavity 30, so as to improve the heat preservation effect.

[0055] The cover 1 and the container 2 are placed in the concave cavity 30 together, that is, the cover 1 is seated on the top of the base 3, the convex buckle 31 is buckled and connected by rotating the U-shaped buckle ring 41, that is, the fastening piece 4 and the second locking portion are locked, and the cover 1 fixes the container 2 in the base 3. After the cover 1 is vacuumized through the air extraction device and the air extraction valve 6, the cover 1 and the base 3 constitute a heat preservation box. The heating device 32 can improve the heat preservation effect of the container 2. During the heating process, the air pressure in the container 2 rises, and the air can be directly discharged to the outside through the pressure relief valve 7.

[0056] In the present utility model, the terms such as first, second, etc. are used, which do not represent any order, quantity or importance, but are only used for distinction.

[0057] As used in the present application, the terms "one", "a", "an", etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced object.

[0058] As used in the present application, the terms indicating orientation or position, such as front end, rear end, top, bottom, side, longitudinal, transverse, middle, center, outer, inner, horizontal, vertical, left, right, upper, lower, etc., mean reflecting relative position, not absolute position.

[0059] As used in the present application, the terms "approximately", "substantially", "about", "near", etc. are used to indicate a limitation of a defined term to allow for a certain degree of deviation. The amount of deviation allowed can vary depending on the particular context.

Claims

1. A lunch box comprising a cover, a container and a base, characterized in that, The cover body is provided with fastening members on two opposite sides, and is provided with locking devices on the other two opposite sides, The top of the accommodating box is provided with an open port, and the outer periphery of the top of the accommodating box is provided with a first locking portion, the cover body is covered on the top of the accommodating box, the locking device and the first locking portion are locked, the cover body closes the open port, and the cover body and the accommodating box are connected into an integrated whole, The top of the base is provided with a concave cavity, and the outer periphery of the top of the base is provided with a second locking portion, the accommodating box is placed in the concave cavity, the cover body is seated on the top of the base, the fastening member and the second locking portion are locked, and the cover body fixes the accommodating box in the base.

2. The lunch box according to claim 1, characterized by The bottom surface of the cover body is provided with a boss, an annular groove is formed between the boss and the edge side wall of the cover body, the locking device is provided with an unlocking portion on the top surface of the cover body, the locking device is provided with a locking portion in the annular groove, the locking portion has a tendency to move towards the boss, the top of the accommodating box is inserted into the annular groove, the locking portion limits the first locking portion in a clamping clamping position between the locking portion and the boss from two directions of vertical and horizontal, when the unlocking portion drives the locking portion to move away from the boss, the locking portion is separated from the clamping clamping position, and the cover body is separated from the accommodating box.

3. The lunch box according to claim 2, characterized by The two locking devices are symmetrically arranged left and right, the locking device comprises a locking body and a spring, a sliding groove is arranged in the cover body, the locking body is slidingly arranged in the sliding groove, the spring is arranged in the sliding groove, the outer end of the spring abuts against the side wall of the sliding groove, the inner end of the spring abuts against the locking body, the spring pushes the locking body to move towards the boss by the elastic force, the outer end of the locking body extends out of the locking portion, the locking portion is in the shape of a hook, the bottom surface of the cover body is provided with a limiting groove in communication with the sliding groove, the top of the locking body is provided with the unlocking portion, and the unlocking portion moves in the limiting groove.

4. The lunch box according to claim 2, characterized by The boss is provided with a fixing groove on the side facing the annular groove, the fixing groove is provided with a first sealing ring, the outer side of the first sealing ring extends into the annular groove, the locking portion abuts against the first sealing ring, the top of the accommodating box is provided with a skirt, and the skirt forms the first locking portion, when the top of the accommodating box is inserted into the clamping clamping position, the locking portion and the boss clamp the skirt, the locking portion hooks the bottom surface of the skirt, the boss and the first sealing ring are inserted into the open port in opposition, and the boss abuts against the inner side wall of the accommodating box through the first sealing ring.

5. The lunch box according to claim 3, wherein The locking portion is provided with a guide inclined surface corresponding to the clamping clamping position, the top surface of the skirt is provided with an ejection portion near the edge, the edge of the top surface of the skirt is provided with a lower concave portion, the bottom surface of the skirt is provided with a lower convex portion, the lower convex portion is provided with an arc abutting surface, the ejection portion is inserted between the locking portion and the first sealing ring, the spacing of the clamping clamping position is expanded, until the corner of the lower concave portion abuts against the guide inclined surface, the lower concave portion is continuously moved upwards to further expand the spacing of the clamping clamping position, until the locking portion contacts the arc abutting surface, and the locking portion slides over the arc abutting surface to support the bottom surface of the lower convex portion.

6. The lunch box according to claim 2, wherein The cover body comprises an upper cover and a lower cover, the lower cover is fixed on the bottom surface of the upper cover, and the lower cover forms the boss, and the lower cover is inserted into the accommodating box.

7. The lunch box according to claim 6, characterized by The upper cover and the lower cover form a hollow sealing layer therebetween, the cover body is provided with an air extraction valve corresponding to the sealing layer, air in the sealing layer is extracted by the air extraction valve, the vacuum degree in the sealing layer is adjustable, and the cover body serves as a heat preservation cover.

8. The lunch box according to claim 7, characterized by The air extraction valve comprises a pressing plug, a second sealing ring and a compression spring, the top surface of the lower cover is provided with a fixing position and a limiting guide column, the outer periphery of the pressing plug is provided with a convex edge, the convex edge is provided with a guide hole, the pressing plug is sleeved on the limiting guide column through the guide hole, the top of the limiting guide column is provided with a limiting piece for limiting the pressing plug from being separated from the limiting guide column, the bottom of the compression spring is abutted against the fixing position, the top of the compression spring is abutted against the bottom of the pressing plug, the upper cover is provided with a gas guide hole, the side surface of the bottom of the gas guide hole is provided with a gas guide channel which is communicated with the sealing interlayer, the top of the pressing plug is inserted into the gas guide hole, the second sealing ring is arranged on the outer periphery of the top of the pressing plug, the pressing plug is pushed upward by the elastic force of the compression spring, the convex edge of the pressing plug is abutted against the limiting piece or the bottom surface of the gas guide hole, at this time, the second sealing ring is moved to above the gas guide channel, the second sealing ring and the gas guide hole are sealed to block the communication between the sealing interlayer and the outside, when an external force presses the pressing plug downward until the second sealing ring is moved to below the gas guide channel, the sealing interlayer is communicated with the gas guide hole through the gas guide channel.

9. The lunch box according to claim 7, characterized by The cover body is provided with a pressure relief valve, the lower cover is provided with a first pressure relief hole, the lower cover is provided with a third sealing ring around the first pressure relief hole, the bottom surface of the upper cover extends downward and is provided with an annular wall, the annular wall is provided with a second pressure relief hole, after the upper cover and the lower cover are connected, the annular wall is abutted against and sealed by the third sealing ring, the first pressure relief hole and the second pressure relief hole are communicated, the pressure relief valve is movably arranged in the second pressure relief hole, and the bottom of the pressure relief valve is inserted into the first pressure relief hole.

10. The lunch box according to claim 1, characterized by The bottom seat is provided with a heating device, when the containing box is placed in the concave cavity, the heating device is used for heating the containing box, the bottom surface of the skirt of the top of the containing box is higher than the top surface of the bottom seat, the fastening piece is a N-shaped buckle, the two ends of the N-shaped buckle are rotationally connected with the cover body, the side surface of the bottom seat is provided with a convex buckle, the convex buckle constitutes the second locking part, and the N-shaped buckle is rotationally connected with the convex buckle through buckling.

11. The lunch box according to claim 1, characterized by The top surface of the cover body is provided with an N-shaped handle and an N-shaped groove, the two ends of the N-shaped handle and the two ends of the N-shaped groove are rotationally connected, the bottom of the N-shaped handle is provided with a recess, the N-shaped handle is upwardly rotated to abut against the N-shaped groove, the N-shaped handle is backwardly inclined, and the recess and the middle part of the N-shaped groove constitute a mobile phone fixing position.

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