CN217865535U - Packing carton, heating device and food package - Google Patents

Abstract

The utility model provides a packaging box, which comprises a box body, wherein the upper surface of the box body is provided with at least one containing groove for containing food, the upper surface of the box body is also provided with a first limiting bulge, the inner side surface of the first limiting bulge is a first limiting surface, and the first limiting surface and the upper surface form a limiting area in a surrounding way; when two box bodys stack together along vertical direction, the box body that is located the top is last box body, and the box body that is located the below is box body down, and the bottom surface of going up the box body lies in the spacing region of box body down, and the bottom surface of going up the box body and the upper surface of box body are laminated mutually down, and the first spacing arch of box body is used for limiting the bottom surface of box body down and shifts out the spacing region of box body down along the horizontal direction. The utility model provides a food heating's operating procedure can be simplified to the packing carton, saves heat time. Furthermore, the utility model also provides a heating device and food package.

Description

Packing carton, heating device and food package

Technical Field

The utility model relates to a food package technical field, in particular to packing carton, heating device and food package.

Background

The quick-frozen food enters China at the end of the last 90 years, and although the speed is increased by more than 20% every year, the gap is obvious compared with the industry starting in the last 50 years in Japan, europe, america and other countries. Since 2019, consumers slowly and more accept quick-frozen foods due to epidemic situations; in addition, office people or people with no desire for convenience in eating, fast food and convenience in operation also have new requirements.

According to market research, most of quick-frozen foods on the market at present, such as dumplings, rice dumplings, traditional rice and flour foods and the like, have the common heating mode: consumers need to take the food out of the instant-frozen packaging box and heat the food with a microwave oven or a steamer. When more food is needed, the food needs to be respectively put into a plurality of containers, and then the containers are put into a microwave oven or a steamer one by one to be sequentially heated, so that the heating time is increased for consumers, the operation is complicated, and the requirements of modern office people or lazy home people on simple meal and fast food are not met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems of complex operation and time consuming and longer existing heating quick-frozen food. The utility model provides a packing carton, heating device and food package can simplify the operating procedure of food heating, practices thrift the heat time.

The embodiment of the utility model provides a packaging box, which comprises a box body, wherein the upper surface of the box body is provided with at least one containing groove for containing food, the upper surface of the box body is also provided with a first limiting bulge, the inner side surface of the first limiting bulge is a first limiting surface, and the first limiting surface and the upper surface form a limiting area in a surrounding way;

when two box bodys stack together along vertical direction, the box body that is located the top is last box body, and the box body that is located the below is box body down, and the bottom surface of going up the box body lies in the spacing region of box body down, and the bottom surface of going up the box body and the upper surface of box body are laminated mutually down, and the first spacing arch of box body is used for limiting the bottom surface of box body down and shifts out the spacing region of box body down along the horizontal direction.

According to the utility model discloses a further embodiment, first spacing arch is the rectangle cyclic annular, holds the groove and locates within the rectangle region that first spacing arch encloses.

According to another embodiment of the present invention, the bottom of the box body is provided with a first protrusion protruding from the outer sidewall of the containing groove, and the side surface of the first protrusion, which is far away from the outer sidewall of the containing groove, is a second limiting surface;

when two box bodies are stacked together along the vertical direction, the first bulge of the upper box body is positioned in the limit area of the lower box body, and the second limit surface of the upper box body is attached to the first limit surface of the lower box body or has a set gap.

According to the utility model discloses a another embodiment, first bellied inside is equipped with the cavity, and the cavity communicates with holding the groove.

According to the utility model discloses a another embodiment, first bellied quantity is four, all is equipped with the spacing face of a second in each first arch, and the plane at the spacing face place of four seconds encloses into a rectangle region, and when two box bodys stacked together along vertical direction, the spacing face of four seconds of last box body set up with four first spacing faces of lower box body respectively relatively.

According to the utility model discloses a further concrete implementation mode, the spacing face of second sets up for vertical direction slope, and the interval between two spacing faces of relative two second that set up from top to bottom reduces gradually.

According to another embodiment of the present invention, the bottom of the holding tank is provided with a first vent hole.

According to the utility model discloses a another embodiment, the middle part of box body is equipped with a convex part, and the quantity that holds the groove is two at least, respectively holds the groove and surrounds the convex part setting, is equipped with the upper surface and the lower surface second venthole that run through the box body on the convex part.

According to another embodiment of the present invention, the shape of the holding tank is circular, oval or polygonal.

According to another embodiment of the present invention, the box body is made of PP.

According to the utility model discloses a another embodiment still includes the flange, and the flange sets up around the side of box body, and the last border of flange links to each other with the upper surface of box body.

According to the utility model discloses a another embodiment, the outside of flange is equipped with a plurality of second archs, and each second arch sets up along the length direction or the equidistant interval of width direction of box body.

According to another embodiment of the present invention, the length and width of the box body are both less than 160mm.

According to the utility model discloses a further embodiment still includes the tray, and the tray is located the below of box body, uses as the collet, and perhaps, the top of box body is located to the tray, uses as the lid.

According to the utility model discloses a another embodiment is equipped with the first surface and the second surface that are parallel to each other and lie in the opposite both sides of tray on the tray, is equipped with the basin of depositing on the first surface, and the second is equipped with the recess on the surface.

The utility model discloses an embodiment still provides a heating device, including two at least aforementioned arbitrary kind of box bodys, each box body stacks the setting in proper order along vertical direction.

According to the utility model discloses a another embodiment still includes the tray, and the tray is located the bottom that is located the box body of below, or is located the top that is located the box body of top.

According to another embodiment of the present invention, the tray is provided with a first surface and a second surface parallel to each other, the first surface is provided with a water storage tank, and the second surface is provided with a groove.

According to another embodiment of the present invention, the tray is disposed at the bottom of the box body located at the bottom as a bottom support, or the tray is disposed above the box body located at the top as a lid.

According to the utility model discloses a another embodiment is equipped with the spacing arch of second on the first surface, and the spacing arch of second is used for the restriction to be located the box body of below and produces relative movement along the horizontal direction for the tray.

According to the utility model discloses a another embodiment, the tray is located the top of the box body that is located the top, and the second surface sets up upwards.

According to another embodiment of the present invention, the height of the box body is 38-50mm, and the number of the box bodies is 2-6.

According to the utility model discloses a another embodiment, along vertical direction, the interval sets for the distance between the projection of the spacing face of second of two adjacent box bodys.

The utility model discloses an embodiment still provides a food package, including aforementioned any kind of packing carton, still include the wrapping bag, the outside of packing carton is located to the wrapping bag cover.

Compared with the prior art the utility model discloses following beneficial effect has:

the utility model arranges the first limit bulge on the upper surface of the box body, so that the inner side surface of the first limit bulge and the upper surface can form a limit area; when the two box bodies are stacked together along the vertical direction, the bottom surface of the lower box body positioned below is attached to the upper surface of the upper box body positioned above, and the limiting area of the lower box body can limit the bottom surface of the upper box body from moving out of the limiting area along the horizontal direction, so that a plurality of box bodies can be stacked; when more food that needs the heating or need heat different types of food, only need to hold a plurality of box bodys that contain food and send into steamer or microwave oven after together and heat, can realize once only heating multiple food to practice thrift heat time, make things convenient for the consumer to use.

Drawings

Fig. 1 is a schematic diagram of a cartridge according to an embodiment of the present invention;

fig. 2 is a schematic view of a cartridge body provided by an embodiment of the present invention at another viewing angle;

fig. 3 is a schematic view of a heating device according to an embodiment of the present invention;

FIG. 4 shows a cross-sectional view of this FIG. 3;

fig. 5 shows a partially enlarged view of a portion a in fig. 4;

fig. 6 shows a partially enlarged view of a portion B in fig. 4;

fig. 7 is a schematic view of a cartridge provided by another embodiment of the present invention;

fig. 8 is a schematic view of a tray provided in an embodiment of the present invention;

FIG. 9 shows a cross-sectional view of FIG. 8;

fig. 10 shows a schematic view of a heating device according to another embodiment of the present invention.

Reference numerals:

1. a box body; 11. a containing groove; 111. a first vent hole; 12. an upper surface; 13. a first limit projection; 131. a first limit surface; 14. a bottom surface; 15. a first protrusion; 151. a second limiting surface; 152. a cavity; 16. a convex portion; 161. a second vent hole; 17. blocking edges; 171. a second protrusion; 2. a tray; 21. a first surface; 22. a second surface; 23. a water storage tank; 24. a second limit bulge; 25. and (4) a groove.

Detailed Description

The following description is provided for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to only those embodiments. On the contrary, the intention of implementing the novel features described in connection with the embodiments is to cover alternatives or modifications as may be included in the appended claims. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Furthermore, some of the specific details are omitted from the description so as not to obscure or obscure the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

The heating mode of most of the quick-frozen foods on the market at present, such as boiled dumplings, rice dumplings, traditional rice and flour foods and the like, is generally as follows: consumers need to take the food out of the quick-frozen packaging box, put the food into a container, and then heat the food with a microwave oven or a steamer. When more food is needed, the food needs to be respectively put into a plurality of containers, and then the containers are put into a microwave oven or a steamer in batches to be sequentially heated, so that the heating time is increased for consumers, the operation is complicated, and the requirements of modern office people or lazy home people on simple meal and fast food are not met.

In order to solve the technical problem, the utility model provides a packing box, packing box are including the box body that is used for holding food, and this box body can realize placing a plurality of box body range upon range of through special structural design, when the more or need of food that needs the heating heat different types of food, only need to send into steamer or microwave oven after piling up a plurality of box bodies that contain food and heating together, can realize the multiple food of disposable heating to practice thrift heat time, make things convenient for the consumer to use.

In order to make the technical solutions and advantages of the present invention clearer, the following describes embodiments of the present invention in further detail.

Referring to fig. 1 and 2, an embodiment of the present invention provides a packing box, including a box body 1, wherein an upper surface 12 of the box body 1 is provided with at least one concave containing groove 11, the containing groove 11 is used for containing food, the upper surface 12 of the box body 1 is further provided with a first limiting protrusion 13, an inner side surface of the first limiting protrusion 13 is a first limiting surface 131, and the first limiting surface 131 and the upper surface 12 enclose a limiting area;

referring to fig. 3 to 5, when two cases 1 are stacked together in a vertical direction (X direction as shown in fig. 4), the case 1 located above is an upper case, the case 1 located below is a lower case, a bottom surface 14 of the upper case is located in a limit region of the lower case, the bottom surface 14 of the upper case is attached to an upper surface 12 of the lower case, and a first limit protrusion 13 of the lower case is used to limit the bottom surface 14 of the upper case from moving out of the limit region of the lower case in a horizontal direction (Y direction and Z direction as shown in fig. 3).

When the consumer needs to heat quick-frozen food, the packaging box provided by the utility model can be directly placed into a steamer or a microwave oven for heating, thereby enabling the consumer to heat food in the space (such as an office) lacking in a cooking tool. In the embodiment, the first limiting bulge 13 is arranged on the upper surface 12 of the box body 1, so that the inner side surface of the first limiting bulge 13 and the upper surface 12 can form a limiting area; when two box bodies 1 are stacked together along the vertical direction, the bottom surface 14 of the lower box body positioned below is attached to the upper surface 12 of the upper box body positioned above, and the limiting area of the lower box body can limit the bottom surface 14 of the upper box body to move out of the limiting area along the horizontal direction, so that a plurality of box bodies 1 can be stacked. When the food that needs the heating is more or heats different types of food, only need to fill 1 yards of a plurality of box bodys of food and send into steamer or microwave oven after together and heat, can realize the multiple food of disposable heating to practice thrift heat time, satisfy many people and gather meal or heat food when too much, the consumer is to swift, convenient demand, and can also strengthen the experience sense and the enjoyment of consumer at the heating food in-process.

Furthermore, the utility model discloses the embodiment provides a packing carton not only can be used for heating food, still can be used to cold-stored or freezing food, through 1 range upon range of refrigerator of putting into of a plurality of box bodys that will be equipped with food, can effectively practice thrift the space in the refrigerator.

Alternatively, referring to fig. 1 and 2, the first limiting protrusion 13 is in a shape of a rectangular ring, and the accommodating groove 11 is disposed in a rectangular area surrounded by the first limiting protrusion 13. The bottom of box body 1 is equipped with outstanding first arch 15 in the lateral wall that holds groove 11, and the side of keeping away from the lateral wall that holds groove 11 on first arch 15 is spacing face 151 of second. When the two box bodies 1 are stacked together along the vertical direction, the bottom of the first protrusion 15 of the upper box body is positioned in the limit area of the lower box body, and the second limit surface 151 of the upper box body is attached to the first limit surface 131 of the lower box body or has a set gap.

Optionally, referring to fig. 1, a cavity 152 is formed inside the first protrusion 15, and the cavity 152 is communicated with the containing groove 11. When the consumer needs to take the heated food out of the holding tank 11, the user can put fingers into the cavity 152 to contact with the food, so that the food can be taken out conveniently.

Optionally, the number of the first protrusions 15 is four, each first protrusion 15 is provided with a second limiting surface 151, a plane where the four second limiting surfaces 151 are located encloses a rectangular region, when the two box bodies 1 are stacked together along the vertical direction, the rectangular region enclosed by the four second limiting surfaces 151 of the upper box body falls into the limiting region of the lower box body, and the four second limiting surfaces 151 of the upper box body are respectively arranged opposite to the four first limiting surfaces 131 of the lower box body to limit the front and back (as shown in the Z direction in fig. 3) and the left and right (as shown in the Y direction in fig. 3) directions on the horizontal plane.

Alternatively, referring to fig. 4 and 5, the second limiting surfaces 151 are disposed obliquely with respect to the vertical direction, and the distance between two oppositely disposed second limiting surfaces 151 is gradually decreased from top to bottom (as shown in the X direction in fig. 4). Correspondingly, the outer side wall of the containing groove 11 can be inclined relative to the vertical direction, and the inclination angle is the same as the second limiting surface 151.

Optionally, the box bodies 1 are provided with vent holes, and when the box bodies 1 are put into a steamer or a microwave oven for heating, steam can enter between two adjacent box bodies 1 through the vent holes and contact with food. In order to make the position of the vent hole better known to those skilled in the art, the position of the vent hole is further described in detail by two embodiments.

Example one

Referring to fig. 1 and 2, the bottom of the containing tank 11 is provided with first vent holes 111, the number of the first vent holes 111 is not specifically limited in this embodiment, and each first vent hole 111 is uniformly distributed at the bottom of the containing tank 11. The first vent hole 111 is formed in the bottom of the receiving groove 11, so that the case 1 has a simple structure, thereby saving the processing cost of the case 1.

Example two

Referring to fig. 7, the case 1 is provided at the middle thereof with a protrusion 16, and the upper surface of the protrusion 16 is flush with the upper surface 12 of the case 1 or the upper surface of the protrusion 16 is lower than the upper surface 12 of the case 1. The number of the containing grooves 11 is at least two, each containing groove 11 is arranged around the convex part 16, and the convex part 16 is provided with a second vent hole 161 which penetrates through the upper surface 12 and the lower surface of the box body 1. By adopting the technical scheme, when the steam overflows from the second vent hole 161, the steam can form fan-shaped fluid like a shower head, and further uniformly contacts with food in each containing groove 11, so that the food is uniformly heated; in addition, the opening is made in the convex portion 16 in the middle of the case body 1, not in the bottom of the holding tank 11, and the soup of the food can be prevented from flowing out from the opening in the bottom of the holding tank 11.

The above embodiments are further detailed descriptions of the positions where the ventilation holes are provided, and it cannot be assumed that the specific positions where the ventilation holes are provided are limited to these descriptions. All equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present patent.

It should be noted that it is not necessary that the box body 1 is provided with the vent hole, for example, when a microwave oven is used for heating food, since the microwave oven utilizes the heating principle of molecular collision, the food can be heated even if steam is not introduced into the containing groove 11, and the vent hole is provided to enable the steam to contact with the food, so that the food can be moistened, thereby effectively avoiding the influence of the dryness of the food on the taste. For another example, some food items are provided with their own soup and they need to be cooked rather than steamed, so that the box 1 for containing such food items may not be provided with vent holes. When it should be noted that, if the box body 1 with the vent hole and the box body 1 without the vent hole are stacked together for heating, as shown in fig. 3, the box body 1 without the vent hole is placed on the upper side, and the box body 1 with the vent hole is placed on the lower side, so that the steam can be introduced into the containing groove 11 from the bottom to the top.

Optionally, the shape of the containing grooves 11 depends on the type of food contained therein, and the shape of each containing groove 11 on the same box body may be the same or different. Illustratively, the holding tank 11 may be circular, oval or polygonal. When the shape of the holding tank 11 is a polygon, there is a transition arc between adjacent edges of the polygon. For example, as shown in fig. 1 and 2, the number of the holding grooves 11 is 4, the 4 holding grooves 11 are divided into two rows which are uniformly distributed in the box body 1, the holding grooves 11 are square, a transition arc is arranged between two adjacent edges of the square, and a first protrusion 15 is arranged on the outer side wall of each holding groove 11. For another example, as shown in fig. 3, the number of the holding grooves 11 is 2, 2 holding grooves are arranged in the box body 1 side by side, the holding grooves 11 are rectangular, a transition arc is arranged between two adjacent edges of the rectangle, and each holding groove 11 is provided with two first protrusions 15.

Optionally, the material of the box body 1 is PP. The PP material can be heated in a microwave oven or a steamer and also can be frozen at a low temperature of 18 ℃ below zero.

Optionally, a rib 17 is further included, the rib 17 is disposed around the side surface of the box body 1, and the upper edge of the rib 17 is connected to the upper surface 12 of the box body 1. A plurality of second protrusions 171 are formed on the outer side of the rib 17, and the second protrusions 171 are disposed at equal intervals in the longitudinal direction or the width direction of the case 1. By providing the second protrusion 171, the heat dissipation area of the case 1 can be increased; moreover, when the consumer takes the heated box body 1, the hand of the consumer contacts only the second protrusion 171, so that the contact area of the flange 17 and the hand can be reduced, and the user is prevented from burning the hand; in addition, the second protrusion 171 may also enhance the aesthetic appearance of the case 1.

Optionally, the length and width of the cassette 1 are both less than 160mm. The packaging of most of the quick-frozen foods in the current market is mainly large, and after the packaging is opened, if the food is not eaten completely, waste is generated. This embodiment sets up the length and the width of box 1 to be less than 160mm, the weight of the splendid attire food in reducible packing carton to make the consumer eat food when time and finish, reduce extravagantly.

Optionally, the packaging box provided by this embodiment further includes a tray 2, and a consumer can set the tray 2 below the box body 1 according to his own needs, as a bottom support, as shown in fig. 4; the tray 2 may be provided above the case 1 as a cover, as shown in fig. 10. Specifically, referring to fig. 8 and 9, the tray 2 is provided with a first surface 21 and a second surface 22 which are parallel to each other and located on two opposite sides of the tray 2, the first surface 21 is provided with a water storage tank 23, and the second surface 22 is provided with a groove 25.

Specifically, the position of tray 2 is relevant with the heating environment, when needs put into the microwave oven with food and steams, because do not have the household utensils that can contain water in the microwave oven, consequently can regard tray 2 as the collet to use, pours water into water storage tank 23, places box body 1 above tray 2's first surface 21, and in the heating process, water in the water storage tank 23 can provide steam to food. When food is put into the steamer to be steamed, the steamer can hold water, so that the tray 2 does not need to be arranged below the box body 1 to hold water, the tray 2 can be buckled above the box body 1 as a cover at the moment, the second surface 22 is placed upwards, and fingers of a consumer can stretch into the groove 25 to take the tray 2. The design of this embodiment to tray 2 can make the consumer use in different scenes according to self demand, and is convenient nimble.

Referring to fig. 3, the present invention further provides a heating device, which includes at least two of the above-mentioned box bodies 1, and each box body 1 is stacked in sequence along the vertical direction. Specifically, the types of food contained in the respective cases 1 may be the same or different. The box bodies 1 are stacked together and then sent into a steamer or a microwave oven to be heated, so that various foods can be heated at one time, the heating time is saved, and the use by consumers is facilitated.

Optionally, referring to fig. 4 and 10, a tray 2 is further included, and the tray 2 is disposed at the bottom of the lowermost box 1 or above the uppermost box 1. Specifically, referring to fig. 8 and 9, the tray 2 is provided with a first surface 21 and a second surface 22 which are parallel to each other, the first surface 21 is provided with a water storage tank 23 and a second limiting protrusion 24, and the second surface 22 is provided with a groove 25.

When the tray 2 is disposed at the bottom of the lowermost box 1, as shown in fig. 4 and 6, the water storage tank 23 is used for storing water, the first surface 21 is attached to the bottom of the lowermost box 1, and the second limiting protrusion 24 can limit the relative movement of the lowermost box 1 with respect to the tray 2 in the horizontal direction. When the tray 2 is disposed above the uppermost box 1, as shown in fig. 10, the second surface 22 is disposed upward, and the fingers of the consumer can extend into the grooves 25 to take the tray 2.

Optionally, the height of the box body 1 is 38-50mm, and the number of the box bodies 1 is 2-6.

Alternatively, the projections of the first protrusions 15 of two adjacent box bodies 1 do not coincide in the vertical direction, that is, the projections of the second limiting surfaces 151 of two adjacent box bodies 1 are spaced apart by a set distance in the vertical direction. In the time of in-service use, in two adjacent box bodys 1, the bottom surface 14 of the first arch 15 of last box body contacts with the upper surface 12 of box body down to realize that two adjacent box bodys 1 are spacing along vertical direction, adopt above-mentioned technical scheme, through the setting of staggering along vertical direction with the first arch 15 of two adjacent box bodys 1, can prevent that the first arch 15 of last box body from dropping in the cavity 152 of the first arch 15 of box body down.

The utility model discloses an embodiment still provides a food package, including any kind of aforementioned packing carton, still include the wrapping bag, the outside of packing carton is located to the wrapping bag cover.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the invention, and it is not intended to limit the invention to the specific embodiments described. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (24)

1. The packaging box comprises a box body, wherein at least one containing groove is formed in the upper surface of the box body and used for containing food, and the packaging box is characterized in that a first limiting protrusion is further formed in the upper surface of the box body, the inner side surface of the first limiting protrusion is a first limiting surface, and a limiting area is defined by the first limiting surface and the upper surface;

when two the box body stacks together along vertical direction, be located the top the box body is last box body, is located the below the box body is box body down, the bottom surface of going up the box body is located down the box body in the spacing region, just go up the bottom surface of box body with the upper surface of box body is laminated mutually down, down the box body first spacing arch is used for the restriction the bottom surface of going up the box body shifts out along the horizontal direction box body down spacing region.

2. The packaging box according to claim 1, wherein the first limiting protrusion is in a shape of a rectangular ring, and the containing groove is formed in a rectangular area surrounded by the first limiting protrusion.

3. The packaging box according to claim 2, wherein the bottom of the box body is provided with a first bulge protruding from the outer side wall of the containing groove, and the side surface of the first bulge, which is far away from the outer side wall of the containing groove, is a second limiting surface;

when two box bodies are stacked together along the vertical direction, the first bulge of the upper box body is positioned in the limit area of the lower box body, and the second limit surface of the upper box body is attached to the first limit surface of the lower box body or has a set gap.

4. A packing box according to claim 3, wherein a cavity is formed inside the first projection, and the cavity is communicated with the containing groove.

5. The packaging box according to claim 3, wherein the number of the first protrusions is four, each of the first protrusions is provided with one of the second position-limiting surfaces, the planes of the four second position-limiting surfaces enclose a rectangular area, and when two box bodies are stacked together in the vertical direction, the four second position-limiting surfaces of the upper box body are respectively arranged opposite to the four first position-limiting surfaces of the lower box body.

6. The packaging box according to claim 5, wherein the second limiting surfaces are arranged obliquely relative to the vertical direction, and the distance between two oppositely arranged second limiting surfaces is gradually reduced from top to bottom.

7. A pack according to any of claims 1 to 6 wherein the bottom of the receptacle is provided with a first vent hole.

8. The packing box according to any one of claims 1 to 6, wherein a convex portion is provided in the middle of the box body, the number of the containing grooves is at least two, each containing groove is provided around the convex portion, and the convex portion is provided with a second vent hole penetrating the upper surface and the lower surface of the box body.

9. A pack according to any of claims 1 to 6 wherein the receptacle is circular, oval or polygonal in shape.

10. A pack as claimed in any one of claims 1 to 6, wherein the casing is of PP.

11. A pack according to any one of claims 1 to 6, further comprising a rib provided around a side of the body, an upper edge of the rib being connected to an upper surface of the body.

12. The packing box according to claim 11, wherein a plurality of second protrusions are provided on an outer side of the rib, and the second protrusions are provided at equal intervals in a length direction or a width direction of the box body.

13. A pack according to any of claims 1 to 6 wherein the packet has a length and width of less than 160mm.

14. A pack according to any one of claims 1 to 6, further comprising a tray provided below the body as a base or above the body as a lid.

15. The package of claim 14, wherein the tray has a first surface and a second surface parallel to each other and located on opposite sides of the tray, the first surface having a water reservoir therein and the second surface having a groove therein.

16. A heating device comprising at least two packs according to any one of claims 1 to 13, each of said packs being arranged one above the other in a vertical orientation.

17. The heating apparatus as claimed in claim 16, further comprising a tray provided at a bottom of the lowermost box body as a bottom tray or provided above the uppermost box body as a lid tray.

18. The heating apparatus as claimed in claim 17, wherein the tray has a first surface and a second surface parallel to each other, the first surface has a water reservoir, and the second surface has a groove.

19. The heating device of claim 18, wherein the tray is disposed at a bottom of the lowermost box, and the first surface is attached to the bottom of the lowermost box.

20. The heating apparatus as claimed in claim 18, wherein the first surface is provided with a second limiting protrusion for limiting the relative movement of the lowermost cartridge with respect to the tray in the horizontal direction.

21. The heating apparatus as claimed in claim 18, wherein the tray is disposed above the uppermost cartridge body, and the second surface is disposed upward.

22. The heating apparatus as claimed in claim 16, wherein the height of the cartridges is 38-50mm, and the number of cartridges is 2-6.

23. The heating device according to claim 16, wherein a set distance is provided between projections of the second limiting surfaces of two adjacent box bodies in the vertical direction.

24. A food package comprising the package according to any one of claims 1 to 15, and further comprising a packaging bag which is fitted around the exterior of the package.

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