Container provided with airtight door

Abstract

According to the present invention, the bottom of a container is formed as a bent steel base to prevent outside air from entering the container, and a door is formed as an airtight door to prevent outside air from entering, and thus the humidity inside the container is maintained at or below a certain level. To this end, an airtight door structure comprises: a rear frame provided on the rear surface of a main body of a container; a mounting groove recessed inward from the surface of the rear frame; a quadrilateral airtight frame mounted in the mounting groove; a door mounted on the rear surface of the container; and a sealing member that is provided on the inner surface of the door, has a quadrilateral frame shape corresponding to the shape of the airtight frame, and is made of a rubber material. When the door is closed, the sealing member comes into contact with the airtight frame and seals the inside of the container from the outside.

Description

Container with airtight door

[0001] The present invention relates to a container equipped with an airtight door, and to an airtight door structure of a non-powered container that prevents outside air from entering through the container door and maintains the humidity inside the container below a certain level without separate power.

[0002] Typically, containers are used to transport a variety of cargo. Large cargo that cannot fit inside a container or cargo requiring refrigerated or frozen transport is packaged specially, and numerous specialized containers have been developed and are in use for this purpose.

[0003] For example, for large cargo that is difficult to accommodate inside a container, special packaging is done using a flat rack container with the ceiling and side walls removed or an open top container with the ceiling open.

[0004] In addition, in the case of frozen or refrigerated cargo, transportation is carried out through reefer containers equipped with an insulated interior space and a refrigerator, and the transport is carried out with the power connected to maintain cold air.

[0005] On the other hand, transportation of general cargo, excluding special containers such as the above, is mainly carried out by general containers called dry containers.

[0006] The above dry container is a welded-steel structure in which each part forming the internal space is individually assembled to provide structural strength and protection against corrosion and external impact.

[0007] The floor of the above dry container is applied with a wooden floor because wood has good elasticity and is easy to repair, and can be easily secured by nailing to the wood in case cargo of various shapes is accommodated.

[0008] However, in the case of wooden floors, if the thick nails driven into the wood are removed after the cargo is transported, large nail holes will be created in the floor, and outside air can enter through these holes. As the wood absorbs and then releases moisture, the cargo stored inside is exposed to moisture, which can easily cause damage to the cargo.

[0009] Meanwhile, technologies have been developed to construct container floors out of steel floors to address the problem of wooden floors having low strength and being prone to defects such as breakage.

[0010] For example, Chinese Utility Model Publication No. CN 2008-20044621 Y “Container base frame structure” discloses a steel floor that is detachably installed on a frame body using corrugated steel plates. That is, in the prior art document CN 2008-20044621 Y, the steel floor that is fixed to the frame body is connected with nails, bolts, or pins, and has a structure in which a sealant is filled in the connection area, so that it can be replaced and installed when necessary.

[0011] However, if fastening is done with nails, bolts, pins, etc. as described above, dehumidification inside the container becomes impossible as outside air may flow into the fastening area.

[0012] In addition, if you want to fix the position of cargo loaded inside, you can fix the cargo by driving nails into the wooden floor of a dry container with a wooden floor, but if it is made of a steel floor, there is the problem that it is difficult to drive nails.

[0013] Meanwhile, a European patent (EP3642064B1) describes a container refreezing unit (specifically, a curtain track sealing adapter) for maintaining airtightness within a container. This device maintains airtightness by injecting nitrogen gas to prevent leakage to keep vegetables fresh inside the container. Injecting nitrogen gas stops the fruits and vegetables from respiration, effectively extending their storage life by three to four times. The purpose of this invention is to prevent nitrogen gas from leaking outside. However, to prevent nitrogen gas from leaking inside the container, a curtain track unit requires separate installation work at the cargo loading site, and a separate tool must be used to insert plastic to complete the airtightness, which is cumbersome. The European patent relates to a separate airtightness unit (track, plastic curtain, and tool for inserting the plastic curtain), and the separate tool required is inconvenient to use.

[0014] Therefore, a container manufacturing technology that does not require additional work while maintaining container confidentiality is needed, and a container technology that has an airtight function in the door and allows airtight work to be completed simply by closing the door is needed.

[0015] Among the global container traffic, dry containers transported for long periods of time by sea account for an overwhelmingly high proportion. However, due to the structure, 100% perfect sealing is not achieved, so a phenomenon called container rain occurs on the inner walls of the container and the cargo, causing fatal damage to the loaded cargo, such as mold, corrosion, oxidation, and warping.

[0016] In particular, expensive machinery equipment made of metal, iron, processed goods, and other iron raw materials are exported and imported through standardized dry containers. Since the surface temperature of such cargo is relatively lower than the temperature of the air inside the container due to its relatively high heat capacity, there is a very high possibility of condensation occurring directly on the surface of the cargo. If air containing salt causes surface condensation during maritime transport, the possibility of oxidation or corrosion of the cargo increases further.

[0017] Therefore, in order to prevent the occurrence of the above condensation phenomenon, one or more packaging methods are used in the logistics field, including vacuum packaging of the product itself, anti-corrosion coating, and injection of anti-mold preservatives.

[0018] However, the anti-corrosion coating presents the problem of requiring additional work to remove the anti-corrosion coating after transport. Furthermore, the use of anti-corrosion agents does not fundamentally address condensation. Furthermore, the associated packaging and disassembly costs are ultimately passed on to the end consumer, driving up the price of purchased goods.

[0019] The purpose of the present invention is to provide a dehumidifying container structure that prevents internal condensation by blocking the inflow of air from outside the container, securing a sealing performance of the internal space, and maintaining the internal humidity of the container below a certain level.

[0020] The purpose of the present invention is to provide a container door structure that prevents external air from entering by improving the door structure and sealing it to maintain humidity inside the container.

[0021] The present invention blocks external air from entering the interior of the container by configuring the bottom of the container with a steel base in a bent shape, and also blocks external air from entering by configuring the door as an airtight door, thereby maintaining the humidity inside the container below a certain level.

[0022] Looking at the airtight door structure for this, it includes a rear frame provided on the rear of the container body; a mounting groove formed by recessing inwardly on the surface of the rear frame; a square frame-shaped airtight frame mounted on the mounting groove; a door mounted on the rear of the container; and a sealing member provided on the inner surface of the door, having a square frame shape corresponding to the shape of the airtight frame and made of a rubber material; and when the door is closed, the sealing member comes into contact with the airtight frame to seal the interior of the container from the outside.

[0023] The above-mentioned airtight frame is made of a material with a smooth surface, preferably aluminum, and the sealing member is formed with at least one protrusion protruding toward the airtight frame to ensure airtight performance when the door is closed.

[0024] The above door is composed of two left and right doors that open to both sides, and the sealing member may be formed in a T-shape facing each other on the inner side of each of the left and right doors, or the sealing member may be formed in a M-shape on the inner side of each of the left and right doors. In addition, an additional second sealing member may be provided on the central surface where the left and right doors come into contact when closed.

[0025] The present invention has the advantageous effect of preventing the humidity inside the container from increasing by blocking outside air from entering the container through the above-mentioned airtight door structure, thereby enabling the humidity inside the container to be maintained at a certain level.

[0026] Figure 1 is an overall view of a container according to the present invention.

[0027] Figure 2 is a longitudinal cross-sectional view of a container according to the present invention.

[0028] Figures 3 to 5 show the airtight door structure of a container according to the present invention.

[0029] Figures 6 and 7 show the container according to the present invention with the door closed, as viewed from inside the container.

[0030] Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings.

[0031] When adding reference signs to components of each drawing, identical components are described with the same signs as much as possible even if they are shown on different drawings.

[0032] In addition, in the description of the embodiments, if it is determined that a specific description of a related known configuration or function hinders the understanding of the embodiments of the present invention, the description is simplified or omitted, and if it is described that a certain component is “equipped with” or “connected to” another component, it should be understood that the component may be directly equipped with or connected to the other component, but another component may also be “equipped with” or “connected” between each component.

[0033] The container according to the present invention uses steel members throughout its floor structure instead of the conventional wood. That is, the container floor of the present invention is formed of a steel base structure having a bent shape, and since it is formed entirely of a single steel plate, the inflow of external air through the floor is blocked, thereby providing an internal space with secured airtightness. This prevents the inflow of moisture due to the inflow of external air, thereby maintaining the humidity inside the container below a certain level. Although not shown, in order to seal the interior of the container, the door on the rear side that opens and closes the inside and outside of the container is provided with a sealing member on the edge, or an air curtain or the like is used so that when the door is closed, the inflow of air through the door edge is completely blocked.

[0034] And, in order to maintain the pressure in the space inside the container, a separate inlet passage for external air flowing into the container is formed, and a dehumidifying means is provided to remove moisture contained in the external air flowing into this inlet passage, and the biggest feature of the present invention is that the humidity inside the container can always be maintained below a certain level without a separate power supply.

[0035] Fig. 1 is an overall view of a container according to the present invention, and Fig. 2 is a longitudinal cross-sectional view of the container of the present invention, showing a structure in which the lower floor is made of a steel base, enabling the interior of the container to be sealed.

[0036] Referring to these drawings, a container (100) according to the present invention is formed with a front surface (120), an upper surface (140), and both side surfaces (160) formed of metal plates, and a rear surface formed to be openable and closable by a door (180). In addition, the bottom surface of the container is formed of a steel material and is formed with a steel base (hereinafter referred to as a 'steel base (200)') having a bending portion to block air from entering through the inner bottom. The container of the present invention has a structure in which the entire body is sealed since there is no passage for air to enter the top surface, bottom surface, side walls, etc. In the drawings, 170 is a frame member located at the rear of the container body, which is a portion of the container body that faces when the door (180) is closed, and is a square-shaped frame, which is referred to as a 'rear frame' for convenience in the following description.

[0037] In addition, the container door structure is improved to ensure internal airtightness so that the interior space of the container is sealed from the outside air when the door (180) is closed (as described below in FIG. 3). In addition, the steel base of the lower floor of the container is structured so that a corrugated steel plate of a certain width is welded on the side, so that the interior space is completely sealed.

[0038] The metal plates forming the front (120), upper surface (140) and both side surfaces (160) of the above-mentioned internal space are each welded to the frame and integrated, and the lower portions (160) of the both side surfaces are mutually connected using the edges and bends of the steel base (200).

[0039] To this end, side beams (162) are positioned at the lower portions of the two side surfaces (160), and the side beams (162) are formed by bending to have a step (163) at the upper portion. In addition, a bendable joint (212) for joining is provided at the side end portions of the steel base (200). The joints (212) of the steel base (200) secured to the lower portions of the two side surfaces (160) and the step (163) are welded together and integrated, so that the inflow of outside air through the edge of the steel base (200) can be prevented. The steel base (200) according to the present invention does not form holes such as nails or rivets that can communicate with outside air, but is formed integrally by welding using the step (163) and the joints (212), thereby completely blocking the inside and the outside, thereby blocking the inflow of outside air.

[0040] The present invention maintains internal humidity below a certain level by blocking external air from entering the container by configuring the container floor with a steel base in a bent shape. That is, since the floor constituting the internal space of a container was previously made of wood, external air could enter through the wood, making it difficult to control the humidity in the internal space of the container. The present invention fundamentally blocks the inflow of external air through the container floor by constructing the floor with a steel base made of a steel material.

[0041] Figures 3 to 5 are views showing the airtight door structure of a container according to the present invention, and the structure is such that the interior space of the container is sealed from the outside air when the door (180) is closed.

[0042] A door (180) is provided on the rear of the container body, and the square frame portion of the body facing the door when the door is closed is called a rear frame (170). A square mounting groove (175) is formed along the perimeter on the outer surface of the rear frame (170). The mounting groove (175) is a groove formed by recessing inward from the surface of the rear frame (170), and is a portion where an airtight frame (178) to be described below is mounted.

[0043] The above-mentioned confidential frame (178) is a square frame made of aluminum and has a smooth surface. It is preferable that the confidential frame (178) be mounted using screws in the mounting groove (175). An appropriate number of screw grooves are formed on the square frame edge of the confidential frame for screw attachment. However, the shape of the screw grooves is omitted in the drawing for convenience.

[0044] On the inner surface of the door (180), a rubber sealing member (190) is attached at a position corresponding to the airtight frame (178). When the door (180) is closed, the sealing member (190) seals the inside of the container by contacting the outer surface of the airtight frame. At this time, the sealing member secures airtightness by contacting the airtight frame and the square frame as a whole. In order to increase airtightness, it is preferable that the sealing member (190) be formed with a protrusion (195) that protrudes toward the airtight frame (178). More than one protrusion (195) may be formed, and for convenience, FIG. 4 illustrates a state in which two protrusions are formed. When the door is closed in this state, the iron plate of the door itself presses the rubber sealing member, thereby maintaining the airtightness of the inside of the container. And, in order to more effectively secure internal airtightness when the door is closed, it is preferable that the sealing member (190) be formed to be longer downward by a certain length (t in FIG. 5) than the door (180).

[0045] The above sealing member (190) is formed to have a square frame shape like a sealing frame shape on the inner side of the door (180). Since the door (180) is open on both sides, it can have a shape like that of Fig. 6 or Fig. 7. Fig. 6 and Fig. 7 show the door in a closed state as viewed from the inside of the container.

[0046] In Fig. 6, considering that the door (180) opens to both sides, the sealing members (192, 194) can be configured in a T-shape on the inner surface of each of the left and right doors (182, 184). Alternatively, as in Fig. 7, the sealing members (192, 194) can be configured in a M-shape on the inner surface of each of the left and right doors (182, 184). In Fig. 7, the sealing function can be secured even at the central vertical portion where the two sealing members (192, 194) on the left and right meet and make contact, which is advantageous. In Figs. 6 and 7, a separate sealing member made of rubber may be additionally provided on the central vertical surface where the left and right doors make contact when closed, and this is referred to as a second sealing member to distinguish it.

[0047] The present invention utilizes a steel base for the container floor and an airtight structure for the door, thereby completely sealing the interior of the container and preventing moisture from entering due to external airflow, thereby maintaining the humidity inside the container below a required level. In particular, the present invention is a non-powered dehumidifying container capable of dehumidifying without using a power source for dehumidification, such as a dehumidifying device for dehumidifying the interior of the container. A dehumidifying agent may also be appropriately placed in the required locations within the container for dehumidification.

[0048] The present invention prevents outside air from entering the interior of the container through the door by forming a container door with an airtight door structure, thereby controlling the humidity inside the container to a certain level or lower.

Claims

1. Rear frame provided on the rear of the container body; A mounting groove formed by recessing inwardly on the surface of the rear frame; A square-shaped airtight frame mounted in the above mounting groove; a door mounted on the rear of the container; and A sealing member is provided on the inner side of the door, has a square frame shape corresponding to the shape of the airtight frame, and is made of rubber; A container having an airtight door, characterized in that when the door is closed, the sealing member comes into contact with the airtight frame to seal the inside of the container from the outside.

2. In paragraph 1, A container having an airtight door, wherein the airtight frame is made of a material with a smooth surface.

3. In paragraph 2, A container equipped with an airtight door, characterized in that the sealing member has at least one protrusion formed toward the airtight frame to ensure airtight performance when the door is closed.

4. In paragraph 3, The above door consists of two left and right doors that open on both sides, The above sealing member is formed in a ㄷ shape facing each other on the inner side of each of the left and right doors. A container equipped with an airtight door, characterized in that an additional second sealing member is provided on the central surface where the left and right doors contact each other when closed.

5. In paragraph 3, The above door consists of two left and right doors that open on both sides, The above sealing member is formed in a square shape on the inner side of each of the left and right doors. A container equipped with an airtight door, characterized in that an additional second sealing member is provided on the central surface where the left and right doors contact each other when closed.

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