CN212014754U - Lunch box - Google Patents

Abstract

The invention relates to the field of catering appliances, in particular to a heatable fresh-keeping lunch box. The inner-layer closed structure is similar to a sealed container in a steam box, and the outer-layer closed structure imitates the action of the steam box and provides a stable and continuous bacteriostatic environment. Proper amount of water is injected between the inner layer and the outer layer, and the water vapor is used for heat transfer through a heating device in the same principle as the steam box. Through the mode of thermal convection, the inlayer of more direct effective heating upper portion casing, the heat-conduction of rethread inlayer fully heats food and the air above the food, realizes disinfecting and kills alive. The device has simple structure, easy cleaning, portability and fresh-keeping and heating functions.

Description

Lunch box

Technical Field

The invention relates to the field of catering appliances, in particular to a heatable fresh-keeping lunch box

Background

The traditional lunch box is of a heat insulation structure or a water-proof heating structure. The existing other electronic intelligent heating lunch boxes have large volume and mass and are inconvenient to clean. Regarding fresh-keeping, the fresh-keeping is realized by refrigerating and adding ice. The inventor of the invention finds that the steam box is used for heating the sealed container, and food in the container can not go bad for a long time under the condition that the steam box is not opened after heating, thereby achieving the purpose of fresh-keeping unexpectedly. The principle is that heating creates a stable and continuous sterile environment. Meanwhile, it is important to heat the air layer above the food in the sealed container, which is one of the reasons why the microwave oven does not have the similar phenomenon. The inner-layer closed structure is similar to a sealed container in a steam box, and the outer-layer closed structure imitates the action of the steam box and provides a stable and continuous bacteriostatic environment. Proper amount of water is injected between the inner layer and the outer layer, and the water vapor is used for heat transfer through a heating device in the same principle as the steam box. Through the mode of thermal convection, the inlayer of more direct effective heating upper portion casing, the heat-conduction of rethread inlayer fully heats food and the air above the food, realizes disinfecting and kills alive. The specific heating device, the electric heating pipe, the lock catch, the buckle and the timer can refer to the conventional structure (201721292180.0) and the like, the vent hole can refer to the conventional structure (20161133767.7) and the like, the specific sealing, such as the sealing ring, the frosting and the tight embedding, can be easily realized by a person skilled in the art, and the invention is not repeated in detail if no additional beneficial effect is provided. When in actual use, the food preservation box can also be used as a snack preservation box, and long-term preservation can be realized.

Disclosure of Invention

The invention aims to provide a fresh-keeping heating lunch box which is simple in structure, easy to clean, portable and has fresh-keeping and heating functions.

In order to realize the advantages, the invention adopts the following technical scheme:

a lunch box is characterized by comprising a water filling port cover body, an upper shell, a lower shell and a heating system, wherein the upper shell and the lower shell are of double-layer structures, a second accommodating space is defined by an inner layer of the upper shell and an outer layer of the upper shell, and a third accommodating space is defined by an inner layer of the lower shell and an outer layer of the lower shell; when the upper shell and the lower shell are spliced, the inner layer of the upper shell and the inner layer of the lower shell are closed, the outer layer of the upper shell and the outer layer of the lower shell are closed, the inner layer of the upper shell and the inner layer of the lower shell enclose a first accommodating space, namely an inner accommodating space, the second accommodating space is communicated with the third accommodating space to form an outer accommodating space, the inner accommodating space is positioned in the outer accommodating space, and the inner accommodating space is not communicated with the outer accommodating space; the outer layer of the lunch box shell is provided with a water filling port which is communicated with the outer containing space and the external environment, and a cover body of the water filling port is matched with the water filling port; the heating system is positioned in the outer containing space;

optionally, the lunch box is characterized in that a water filling port of the lunch box is positioned on the outer layer of the upper shell; the heating system is positioned in the third accommodating space;

as a further option, the structure is characterized in that the bottom of the outer layer of the upper shell and the bottom of the inner layer of the upper shell are connected into an integral structure, and the top of the outer layer of the lower shell and the top of the inner layer of the lower shell are connected into an integral structure; the second accommodating space is communicated with the third accommodating space through a through hole, the bottom of the outer layer of the upper shell is connected with the bottom of the inner layer of the upper shell, an upper shell through hole is formed at the closed overlapping position of the upper shell and the lower shell, the top of the outer layer of the lower shell is connected with the top of the inner layer of the lower shell, a lower shell through hole is formed at the closed overlapping position of the upper shell, the upper shell through hole and the lower shell through hole are corresponding to each other and are communicated with each other when being closed;

optionally, the lunch box is characterized in that a water filling port of the lunch box is positioned on the outer layer of the lower shell; the heating system is positioned in the second accommodating space; the upper shell is formed by an upper shell outer layer and an upper shell inner layer and can be spliced, and the lower shell is formed by a lower shell outer layer and a lower shell inner layer and can be spliced; the bottom of the inner layer of the upper shell extends to the bottom of the outer layer of the upper shell, the top of the inner layer of the lower shell extends to the top of the outer layer of the lower shell, the second accommodating space is communicated with the third accommodating space by a through hole, the extending part of the bottom of the inner layer of the upper shell is provided with an upper shell through hole, the extending part of the top of the inner layer of the lower shell is provided with a lower shell through hole, the upper shell through hole and the lower shell through hole are corresponding, and the upper shell through hole and the lower shell through hole are communicated when the shells are closed and are positioned in;

optionally, the lunch box is characterized in that a water storage baffle is arranged on the outer surface of the inner layer of the upper shell of the lunch box, and the height of the water storage baffle is smaller than the distance from the inner surface of the outer layer of the upper shell to the outer surface of the inner layer of the upper shell;

optionally, the upper housing outer layer and the upper housing inner layer are connected by a spring; when the outer layer of the upper shell and the outer layer of the lower shell are spliced, the spring is in a stable compression state, and stable and continuous pressure is provided for splicing the inner layer of the upper shell and the inner layer of the lower shell;

optionally, the inner layer of the upper shell is provided with an openable air hole which is communicated with the inner and outer accommodating spaces;

optionally, the upper shell has a pressure limiting valve on its inner layer to communicate the inner and outer containing spaces;

drawings

Fig. 1 is a drawing corresponding to embodiment 1, wherein the left one is a schematic structural diagram, the left two is a perspective view, in fig. 1, (101) is a water injection port, (102) is an upper shell outer layer, (103) is an upper shell inner layer, (104) is an upper shell through hole, (105) is a lower shell through hole, (106) is a lower shell outer layer, (107) is a lower shell inner layer, and (108) is a heating zone

Fig. 2 is a drawing corresponding to embodiment 2, in which the left one is an exploded perspective view, the left two is a combined perspective view, the left three is an exploded structural view, the left four is a combined structural view, and in fig. 2, (201) is a heating area, (202) is an upper shell outer layer, (203) is an upper shell inner layer, (204) is an upper shell inner layer through hole, (205) is a lower shell inner layer through hole, (206) is a lower shell inner layer, (207) is a lower shell outer layer, (208) is a water injection port, and (209) is a support leg

Fig. 3 is a drawing corresponding to embodiment 3, where fig. 3 is a schematic structural diagram at the left side and a gasket at the right side, and in fig. 3, (301) is a plug capable of opening and closing an air hole, (302) is a water injection port, (303) is a spring, (304) is an upper shell outer layer, (305) is an upper shell inner layer, (306) (310) is a baffle, (307) is a lower shell outer layer, (308) is a lower shell inner layer, (309) is a heating zone, and (311) is a water storage baffle

Detailed Description

The area enclosed by the inner layer of the upper shell and the outer layer of the upper shell is a second accommodating space, the area enclosed by the inner layer of the lower shell and the outer layer of the lower shell is a third accommodating space, and after the two parts are spliced, the second accommodating space and the third accommodating space are collectively called as an outer accommodating space; the area enclosed by the inner layer of the upper shell and the inner layer of the lower shell is a first containing space, namely an inner containing space.

The water filling port of the embodiment is in an outward convex type, the cover body of the water filling port is in a conventional structure diagram and is not shown, and a knob type structure, a bayonet type structure, an embedded type structure, a plug type structure and the like are in conventional structures, so that the sealing effect can be achieved; the water filling port can be replaced by an inward concave type, and the corresponding cover body of the water filling port is matched with conventional structures such as an inward spiral type and the like. The tight closing can be realized by the conventional means such as rubber gasket, frosting, embedding and the like; hinges, buckles, latches, snaps, etc. (see 201721292180.0 for example) may be added for securing and closing; the heating mode can be selected from resistance type, electric heating pipe, etc., and timer controlled heating, etc. (refer to 201721292180.0), or heating bag capable of releasing heat when meeting water for self-heating chafing dish, etc., which can be realized by the prior art; according to different heating modes, specific technologies such as whether the external accommodating space is communicated with the heating area or not, whether the external accommodating space is waterproof or not are judged, and the technical difficulties are avoided, such as that water can smoothly enter the heating bag, the resistance wire needs to be waterproof and the like; if the first containing space formed by the inner layers of the upper and lower shells is not provided with an open-close air hole, and the pressure limiting valve is communicated with the outer containing space, the tight closing of the inner layers of the upper and lower shells cannot be realized by a fixing mode such as a screw and the like, so as to prevent the explosion. Meanwhile, when the inner accommodating space is sealed and heated, the air pressure is larger than that of the outer accommodating space, the spring in the embodiment is compressed, the inner layer of the upper shell and the inner layer of the lower shell are separated to exhaust air, and or the rubber ring between the inner layer of the upper shell and the inner layer of the lower shell is deformed to realize air exhaust; if the inner and outer layers of embodiment 3 are connected by a spring and it is difficult to apply a force to separate the inner layer of the upper housing from the inner layer of the lower housing, then an opening/closing vent (see 201611133767.7, for example) and a pressure limiting valve are additionally installed to balance the difference between the pressure of the inner and outer air, and the first accommodating space can also serve to seal the inner and outer accommodating spaces when not heated. The shell can be made of materials which are resistant to water immersion, temperature, corrosion and rust; the inner layer can be made of a material with good heat conduction effect; the outer layer can be made of heat insulating materials; the inner and outer layers of the upper and lower shells should be made of materials which can resist 100 ℃ at least. In order to make the air current circulate better and have better heating effect, the water injection port and the heating area are not located in the second accommodating space, and the water injection port and the heating area are not located in the third accommodating space.

The heating time is 5-10min or more, most bacteria can be killed, and the pathogenic toxin of heat-resistant bacteria can be decomposed by heating at 85 deg.C for 5 min. The normal boiling sterilization is carried out at 100 deg.C for 15-30 min. When water is injected, a small amount of sodium bicarbonate is added to raise the boiling point of the solution to 105 ℃, so that rust prevention and decontamination are realized. During cleaning, a small amount of white vinegar is added to remove scale.

It is further speculated about the preservation principle that although the outer accommodating space is filled with water vapor, the air flow direction moves from the inner accommodating space to the outer accommodating space, and after cooling, the water activity Aw of the inner accommodating space detected by the activity meter is lower than that of a control group, so that the growth of microorganisms and bacteria is inhibited to a certain extent. In general, the temperature in the inner containing space does not reach the boiling point under the sealing pressure; after cooling, the inner containment volume is less air pressure than the outside, but one possible scenario. Generally, the first accommodating space is heated in a water bath, the highest temperature is slightly lower than 100 ℃, and because the first accommodating space is a closed space during heating, the air pressure is high, water in the first accommodating space does not continuously boil, and the possibility of overlarge pressure of the first accommodating space is low. Therefore, the openable air hole, the rubber ring between the inner layer of the upper shell and the inner layer of the lower shell (which can be sealed by technical means such as screw, frosting, spring, clamping groove and the like) and the like are optional and unnecessary technical characteristics.

If the pressure in the inner containing space is lower than the outside after cooling, the inner layer of the upper casing and the inner layer of the lower casing may be difficult to separate, and particularly in embodiment 3, the inner and outer layers are difficult to separate by the spring connection. Therefore, in example 3, an openable/closable air hole is provided in the inner layer of the upper case below the water inlet in the outer layer of the upper case, and is closed at ordinary times, and when the inner layer of the upper case and the inner layer of the lower case are difficult to separate from each other, the air hole is opened to balance the internal and external air pressures, and the inner layer of the upper case and the inner layer of the lower case are separated from each other. The air holes can be opened and closed by conventional opening and closing structures such as a button type, a plunger type, a knob type and the like; example 3 uses a plunger type, closed for freshness preservation and open for heating.

The external containing space is mainly used for containing gaseous, liquid and solid water; the inner containing space is mainly used for containing food. Meanwhile, the lunch box can be placed in a refrigerator for freezing storage under the states of adding water and not adding water, and the difference of the using methods is only, so that no new points are created and repeated.

The heating device can be additionally provided with a controller and a timer for realizing common effects of intermittent heating, timed heating and the like.

Example 1

The inner layer (103) of the upper shell and the bottom edge of the outer layer (102) of the upper shell are hermetically and closely connected to form an integrated inseparable structure, and an upper shell through hole (104) is formed at the joint; the top edges of the lower shell inner layer (107) and the lower shell outer layer (108) are tightly closed and connected to form an integrated inseparable structure, and a lower shell through hole (105) is formed at the joint; the upper shell through hole (104) and the lower shell through hole (105) are spliced on the outer layer (102) of the upper shell and the outer layer (108) of the lower shell, and the inner layer (103) of the upper shell is communicated with the inner layer (107) of the lower shell when being spliced; the water injection port (101) is positioned on the outer layer (102) of the shell at the upper part of the second accommodating space, the outer edge of the water injection port is provided with a screw, and a screw cap is matched with the water injection port (101) for use; the heating adopts resistance heating, the heating zone (108) is positioned in the third accommodating space, and the heating zone is waterproof and is not communicated with the third accommodating space; frosting is arranged in the splicing area of the joint of the inner layer and the outer layer of the upper shell and the joint of the inner layer and the outer layer of the lower shell. The using method comprises the following steps: after the cooked food and the lunch are placed in the inner containing space, the upper shell and the lower shell are spliced. And opening the screw cap to inject a proper amount of water from the water injection port, and enabling the water to enter the third accommodating space through the second accommodating space, wherein the water injection amount is less than the volume of the third accommodating space. The resistor is electrified to generate heat, and the water in the third accommodating space is heated. Rubber rings are arranged on the inner layer of the upper shell and the inner layer of the lower shell, so that the phenomenon that the inner containing space is too high in pressure and burst during heating is avoided. 5-10min later, after the water in the external containing space is substantially evaporated to dryness, the power supply is closed, the screw cap of the water filling port is screwed, and then the water is kept stand and cooled, so that the fresh-keeping and carrying can be realized. Before eating, water can be injected for heating.

Example 2

The inner layer (203) of the upper shell and the outer layer (202) of the upper shell can be tightly spliced, and a through hole (204) is formed in the bottom extension part of the inner layer (203) of the upper shell; the lower shell inner layer (206) and the lower shell outer layer (207) can be tightly spliced, and a through hole (205) is formed in the top extension part of the lower shell inner layer (206); the upper shell through hole (204) is communicated with the lower shell through hole (205) when the upper shell and the lower shell are spliced, and the upper shell through hole and the lower shell through hole are both positioned in the outer accommodating space; the water injection port (208) is positioned on the outer layer of the lower shell of the third accommodating space, and the water injection port and the cover body adopt a bayonet type; the heating adopts the heating package heating, and heating zone (201) are located the second accommodation space, and heating zone (201) inside has the through-hole to communicate with each other with the second accommodation space, not drawn in the figure, and heating zone (201) are on upper portion casing skin (202), have the open structure of apron cooperation heating zone (201) to use, can not leak when inverting. The using method comprises the following steps: after the cooked food is placed in the inner containing space, the outer layer (202) of the upper shell, the inner layer (203) of the upper shell, the inner layer (206) of the lower shell and the outer layer (207) of the lower shell are combined. The heating bag is placed into the heating area (201), the cover plate is closed, the whole lunch box is inverted, the screw cap is opened, a proper amount of water is injected from the water injection port (208), the water enters the second accommodating space through the third accommodating space, and the water injection amount is smaller than the volume of the second accommodating space. The heating bag reacts with water to release heat, and heats water in the second accommodating space. A rubber ring is arranged between the upper shell inner layer (203) and the lower shell inner layer (206), so that on one hand, the sealing is realized, and meanwhile, the explosion caused by the overlarge pressure of the inner containing space during heating is avoided. After the heating bag completely and fully reacts and releases heat, the cover body matched with the water injection port (208) is pressed, and then the heating bag is inverted for the second time and stands for cooling, so that the fresh-keeping and carrying can be realized. The food in the inner containing space and the air in the inner containing space can be changed by inverting for the second time, and the food and the residual heat of the inner layer are used for heating the air for sterilization. Before eating, water can be injected for heating. Compared with the embodiment 1, the inner layer and the outer layer can be decomposed when in use, and are convenient to clean and use. In addition, the conventional structures such as a hasp and the like can be arranged on the outer layer of the box body, and external force is applied to play a role in fixing and assisting in closing.

Example 3

An inner layer (305) of the upper shell and an outer layer (304) of the upper shell are connected through a spring; the inner layer (308) of the lower shell and the outer layer (307) of the lower shell are connected by a spring; the water injection port (302) is positioned on the outer layer (304) of the shell at the upper part of the second accommodating space, the outer edge of the water injection port (302) is provided with a slot bayonet, and the plug type cover body is matched with the water injection port (302) for use; an openable air hole is arranged on the inner layer (304) of the upper shell below the water filling port (302), and a plug body (301) is arranged on the air hole for matching use to control opening and closing and balance internal and external pressure difference; an upper shell inner layer (305) positioned below the upper shell outer layer water injection port (302) and provided with an annular water storage baffle plate (311); the heating adopts a heater for heating, and the heating area is positioned in the third accommodating space. The length and the stiffness coefficient of the spring are such that after the food is placed in the first accommodating space and compressed, the spring can still be further compressed to provide pressure for the close closing of the inner layers of the upper and lower shells. The using method comprises the following steps: after food is placed in the inner accommodating space, the upper shell inner layer (305) and the lower shell inner layer (308) are spliced, and the upper shell outer layer (304) and the lower shell outer layer (307) are spliced at the same time. The screw cap is opened to inject a proper amount of water from the water injection port (302), a certain amount of water is stored on the annular water storage baffle plate (311), overflowed water enters the third accommodating space through the second accommodating space, and the water injection amount is smaller than the volume of the third accommodating space. The earlier stage of water in the annular water storage baffle plate is used for cooling the inner layer of the upper shell, so that the vapor in the first accommodating space is condensed and refluxed without generating overlarge air pressure too early, and the temperature is stably increased; the temperature of the first accommodating space can be stabilized to a certain extent by the heat absorption of the gasification of the first accommodating space when the temperature of the first accommodating space rises at the later stage. The specific effects refer to the overflow prevention pot with water injected into the cast iron pot cover, but the overflow prevention pot has different beneficial effects: 1) the internal environment temperature of the first accommodating space can be continuously and stably increased, and a better sterilization effect is obtained; 2) the outer containing space is arranged outside the first containing space, although the water injection port is communicated with the atmosphere of the external environment during heating, the water vapor content is far higher than that of the natural environment outside the cast iron pot, the cast iron pot is mainly used for stewing, and the water activity Aw of the food material is extremely high without considering the factor; therefore, when the temperature approaches 100 ℃, the internal space which is originally continuously deflated is intermittently ejected by absorbing heat through the evaporation of water in the annular water storage baffle; even if the selected spring has stronger elasticity and proper pressure, no gas can be discharged from the interior, and the residual heat exchange is realized by evaporating and absorbing heat of water in the annular water storage baffle. Not only the food at the bottom in the first accommodation space in earlier stage has been guaranteed can not dried, has guaranteed again that the later stage can not be too moist, and food water activity Aw is too big. The resistor is electrified to generate heat, and the water in the third accommodating space is heated. An upper housing inner layer (305) and a lower housing inner layer (308). 5-10min later, after the water in the external accommodating space is substantially evaporated to dryness, the power supply is closed, and the heating controllable switch is automatically powered off. After being inserted into a cover body matched with the water filling port (302), the water filling port is kept stand and cooled, and the fresh-keeping and carrying can be realized. Before eating, water can be injected for heating. Besides heating and preservation, the scheme of the embodiment also has the advantages of shock resistance and difficult splashing. The baffle plate (310) is used when containing food, and prevents soup from dripping into the third containing space. The spring has an antirust coating.

Claims (8)

1. A lunch box is characterized by comprising a water filling port cover body, an upper shell, a lower shell and a heating system, wherein the upper shell and the lower shell are of double-layer structures, a second accommodating space is defined by an inner layer of the upper shell and an outer layer of the upper shell, and a third accommodating space is defined by an inner layer of the lower shell and an outer layer of the lower shell; when the upper shell and the lower shell are spliced, the inner layer of the upper shell is closed with the inner layer of the lower shell, the outer layer of the upper shell is closed with the outer layer of the lower shell, a first accommodating space, namely an inner accommodating space, is defined by the inner layer of the upper shell and the inner layer of the lower shell, the second accommodating space is communicated with the third accommodating space to form an outer accommodating space, the inner accommodating space is positioned in the outer accommodating space, and the inner accommodating space is not communicated with the outer accommodating space; the outer layer of the lunch box shell is provided with a water filling port which is communicated with the outer containing space and the external environment, and a cover body of the water filling port is matched with the water filling port; the heating system is located within the outer containment space.

2. The lunchbox of claim 1, wherein the fill port of the lunchbox is located in an upper shell outer layer; the heating system is located in the third accommodating space.

3. The lunch box according to claim 1 or 2, wherein the bottom of the outer layer of the upper shell and the bottom of the inner layer of the upper shell are connected into a whole structure, and the top of the outer layer of the lower shell and the top of the inner layer of the lower shell are connected into a whole structure; the second accommodating space is communicated with the third accommodating space through a through hole, the bottom of the outer layer of the upper shell is connected with the bottom of the inner layer of the upper shell, an upper shell through hole is formed in a closed overlapping position of the upper shell and the lower shell, the top of the outer layer of the lower shell is connected with the top of the inner layer of the lower shell, a lower shell through hole is formed in a closed overlapping position of the upper shell and the lower shell, and the upper shell through hole and the lower shell through hole correspond to each other and are communicated with each other.

4. The lunch box according to claim 1, wherein the water filling port of the lunch box is positioned at the outer layer of the lower shell; the heating system is positioned in the second accommodating space; the upper shell is formed by an upper shell outer layer and an upper shell inner layer and can be spliced, and the lower shell is formed by a lower shell outer layer and a lower shell inner layer and can be spliced; the upper portion casing inlayer bottom is extended to upper portion casing outer bottom, and lower part casing inlayer top is extended to the outer top of lower part casing, communicating of second accommodation space and third accommodation space to the through-hole realizes, and upper portion casing bottom extension part has upper portion casing through-hole, and lower part casing inlayer top extension part has lower part casing through-hole, and upper portion casing through-hole, lower part casing through-hole are corresponding, and upper portion casing through-hole, lower part casing through-hole communicate with each other when the casing is closed, are located outer accommodation space.

5. The lunchbox of claim 1, wherein the exterior surface of the interior upper shell of the lunchbox has a water barrier, the water barrier having a height less than the distance from the interior surface of the exterior upper shell to the exterior surface of the interior upper shell.

6. The lunchbox of claim 1, wherein the upper housing outer layer and the upper housing inner layer are connected by a spring; when the outer layer of the upper shell is spliced with the outer layer of the lower shell, the spring is in a compression deformation state.

7. The lunch box according to claim 1, wherein the upper case inner layer has an openable/closable air hole communicating the inner and outer containing spaces.

8. The lunch box of claim 1, wherein the upper housing has a pressure limiting valve on an inner layer thereof to communicate the inner and outer containing spaces.

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