CN115875917A

CN115875917A - Air-tight device

Info

Publication number: CN115875917A
Application number: CN202111567734.4A
Authority: CN
Inventors: 陈家兴; 张秋琴; 简燕辉; 陈之瑞; 李镇修; 刘烜廷; 刘锦隆; 吴冠龙; 陈立修; 蔡文
Original assignee: Delta Electronics Inc
Current assignee: Delta Electronics Inc
Priority date: 2021-08-03
Filing date: 2021-12-21
Publication date: 2023-03-31
Also published as: CN115705082A; TWI800202B; CN115872295A; TWI792790B; TW202308495A; TW202306885A; TWI781868B; TW202307324A

Abstract

The airtight device comprises a container and an airtight cover, the airtight cover is arranged on the container, and the airtight cover comprises a fixing frame, a door body and a pressurizing handle. The fixing frame is provided with at least one through hole and at least one guide groove, wherein the through hole is communicated with the inner space of the container, the guide groove is provided with a first top surface and a second top surface which are adjacent, and the second top surface is higher than the first top surface. The door body selectively covers the through hole. The pressurizing handle is pivoted with the door body and comprises a first section, a second section and a rotating shaft center, the rotating shaft center is positioned between the first section and the second section, the first section and the second section rotate relative to each other, and the second section is configured to be stressed to drive the first section to move from the lower part of the second top surface to the lower part of the first top surface, so that the rotating shaft center pressurizes the door body.

Description

Air-tight device

Technical Field

The present invention relates to an airtight device, and more particularly to an airtight device which can be used for preserving objects.

Background

With the development and popularization of technology, preservation devices (such as refrigerators, freezers, or freezers) are used in large quantities to preserve food and medicine.

In the process of preserving food and medicines, the door body of the preserving device can generate gaps due to insufficient tightness of closing, so that the preserving effect is negatively influenced, and the preserving period of the food and medicines can also be influenced. Therefore, the food and medicine may be spoiled or overdue and cannot be eaten or taken, thereby causing a serious waste.

Therefore, it is an important subject to provide an airtight device that can tightly cover the door, thereby preventing air leakage and improving the storage effect.

Disclosure of Invention

In order to solve the above problems, the present invention provides an airtight device, which includes a container and an airtight cover. The airtight cover is arranged on the container and comprises a fixing frame, at least one door body and a pressurizing handle. The fixing frame is provided with at least one through hole and at least one guide groove, wherein the through hole is communicated with the inner space of the container, the guide groove is provided with a first top surface and a second top surface which are adjacent, and the second top surface is higher than the first top surface. The door body selectively covers the through hole. The pressurizing handle is pivotally connected to the door body and comprises a first section, a second section and a rotating shaft center, the rotating shaft center is located between the first section and the second section, the first section and the second section rotate relative to each other, and the second section is configured to be stressed to drive the first section to move from the lower portion of the second top surface to the lower portion of the first top surface, so that the rotating shaft center pressurizes the door body.

In some embodiments of the present invention, the fixing frame further includes a sliding rail, the door body has a boss inserted into the sliding rail, the sliding rail is higher than the through hole and a first portion of the sliding rail is gradually increased in height with respect to the through hole, and wherein the door body is configured to be toward or away from a lowest end of the first portion such that the door body is at a closed height or an open height.

In some embodiments of the invention, the height of the second portion of the sliding track relative to the through hole is constant, the second portion communicating with the higher end of the first portion.

In some embodiments of the invention, the door body has a bearing, and the bearing is provided to the boss portion.

In some embodiments of the invention, the airtight cover includes a connecting rod, the airtight cover includes a plurality of pressing handles, and the second sections of the plurality of pressing handles are rotatably connected to the connecting rod.

In some embodiments of the present invention, the airtight cover includes a fixing latch, at least a portion of which is disposed at a side edge of the door body, and the fixing latch is configured to move vertically to fix the door body to the fixing frame.

In some embodiments of the present invention, at least one of the door bodies includes two door bodies, each of the door bodies includes a slide rail and a slide block, and one of the two door bodies is configured to move above the other of the two door bodies, so that the slide block of one of the two door bodies is slidably connected to the slide rail of the other of the two door bodies.

Another aspect of the present invention is to provide an airtight device, which includes a container and an airtight cover. The airtight cover is arranged on the container and comprises a fixing frame, a two-door body and a plurality of pressurizing handles. The fixing frame is provided with two through holes and a plurality of guide grooves, the through holes are communicated with the inner space of the container, each guide groove is provided with a first top surface and a second top surface which are adjacent, and the second top surface is higher than the first top surface. The two door bodies selectively cover the two through holes respectively. The plurality of pressurizing handles are pivotally connected with the two door bodies, wherein each pressurizing handle comprises a first section, a second section and a rotating shaft center, the rotating shaft center is positioned between the first section and the second section, the first section and the second section are configured to rotate relative to each other, and the second section is configured to be stressed to drive the first section to move from the second bottom surface to the first top surface, so that the rotating shaft center pressurizes the door bodies.

In some embodiments of the invention, the fixing frame further comprises sliding rails, each door body has a boss inserted into the sliding rail, the sliding rail is higher than the through hole and the two first portions of the sliding rail are gradually increased in height relative to the through hole, and the door body is configured to be toward or away from the lowest end of the first portion, so that the door body is at a closing height or an opening height.

In some embodiments of the present invention, a height of a second portion of the sliding rail with respect to the through hole is constant, the second portion communicating with a higher end of the second first portion and being located between the second first portions.

In some embodiments of the present invention, each door body has a boss portion inserted into the sliding rail and a bearing provided to the boss portion.

In some embodiments of the present invention, the airtight cover includes a fixing rod, the fixing rod is connected to the fixing frame, and the fixing rod is disposed between the two through holes, wherein the fixing rod has a T-shaped cross section and is used for fixing the two door bodies from the side and from above.

In some embodiments of the present invention, the two door bodies include a slide rail and a slide block, and one of the two door bodies is configured to move above the other of the two door bodies, such that the slide block of the one of the two door bodies is slidably connected to the slide rail of the other of the two door bodies.

In summary, the present invention provides a gas-tight apparatus having a container and a gas-tight cover covering the container and capable of preventing gas or liquid from moving into or out of the container, so that the stored articles (such as food or medicine) in the container can be isolated from the outside, and further prevent the stored articles from being spoiled and being eaten or not ingested due to gas leakage. In addition, the airtight cover is provided with the pressurizing handle, so that a user can simply rotate the pressurizing handle to enable the airtight cover to be in an airtight state or to be released from the airtight state.

The foregoing is merely illustrative of the problems to be solved, solutions to problems, and effects produced by the present invention, and specific details thereof are set forth in the following description and the related drawings.

Drawings

To the accomplishment of the foregoing and related ends, the principles briefly described above will be explained in more detail with reference to embodiments, illustrated in the accompanying drawings. The drawings are only for purposes of illustrating the invention and are not to be construed as limiting the scope of the invention. The principles of the present invention will be clearly explained with reference to the accompanying drawings, in which additional features and details are described in the following, and wherein:

FIG. 1 depicts a schematic view of a gas-tight device, according to some embodiments of the invention;

figure 2 depicts an exploded view of an airtight cover, according to some embodiments of the present invention;

figure 3 shows an enlarged view of a portion of the fixed frame of the airtight cover, according to some embodiments of the present invention;

FIG. 4 depicts an enlarged view of a portion of a door body of an air tight lid, according to some embodiments of the present invention;

FIG. 5 depicts a schematic view of the hermetic cover, wherein the hermetic cover is in a pressurized state, according to some embodiments of the invention;

FIG. 6 depicts a schematic view of the hermetic cover, wherein the hermetic cover is in a pressure-released state, according to some embodiments of the present invention;

FIG. 7 is an enlarged view of the dotted line box S3 in FIG. 5;

FIG. 8 is an enlarged view of the dotted line box S4 in FIG. 6;

fig. 9 is a schematic diagram illustrating an airtight cover according to some embodiments of the present invention, wherein the airtight cover is in an open state; and

fig. 10 is a sectional view of the fixing bar according to a sectional line X in fig. 2.

[ notation ] to show

10: air-tight device

100: container

110 opening of

200 air tight cover

210 fixing frame

211, through hole

213 guide groove

213a first top surface

213b second top surface

214 side wall

215 sliding track

215a first part

215b second part

230 door body

231 projecting part

233 bearing

234 handle

235 sliding rail

237 sliding block

250, a pressurizing handle

251 first stage

253 second stage

255 rotating axis center

270 fixing rod

280 fixed lock

281, rotating hook

281a C-shaped part

281b is a handle

281c rotating shaft

283 fixed hook

290: connecting rod

S1, S2, S3, S4 dotted line box

X is a section line

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, for the sake of simplifying the drawings, some conventional structures and elements are shown in the drawings in a simple schematic manner.

Referring to fig. 1, fig. 1 is a schematic diagram of a hermetic device 10. In some embodiments of the present invention, the gas-tight device 10 can be an ice chest, a freezer, or a refrigerator, wherein the gas-tight device 10 comprises a container 100 and a gas-tight cover 200, the gas-tight cover 200 is closely disposed on the opening 110 of the container 100, and can completely cover the opening 110 and seal the container 100, thereby preventing gas and liquid from entering and exiting the container 100. Specifically, the container 100 may be a square or rectangular cabinet, and the container 100 may house various types of objects (e.g., food or medicine). In addition, the airtight cover 200 includes a fixing frame 210, a door body 230, and a plurality of pressing handles 250, wherein a user can rotate the pressing handles 250 and apply pressure to the door body 230, so that the airtight cover 200 is in an airtight state. Then, the user can further rotate the pressing handle 250 in the reverse direction and release the pressure to the door body 230, so that the airtight cover 200 is released from the airtight state. The detailed structure and related contents of the airtight cap 200 will be described in the following paragraphs. In some embodiments of the present invention, the airtight cover 200 includes only the door 230, and a user may abut the door 230 against the fixing frame 210 and press the door 230 using the pressing handle 250, so that the airtight cover 200 is in an airtight state.

Referring to fig. 1 to 3, fig. 2 is an exploded view of the airtight cover 200. Fig. 3 shows a partially enlarged view of the fixing frame 210 according to the dotted line frame S1 in fig. 2. In some embodiments of the present invention, the fixing frame 210 has two through holes 211 and a plurality of guide grooves 213, wherein the through holes 211 communicate with the inner space of the container 100, so that a user can take out an object received in the container 100 or place the object in the container 100 through the through holes 211 of the airtight cover 200. In addition, the user can selectively move the door 230 and make the door 230 cover the through hole 211 or be away from the through hole 211, the pressing handle 250 can be pivotally connected to the frame of the door 230, wherein the pressing handle 250 includes a first section 251, a second section 253 and a rotating shaft 255, the rotating shaft 255 is located between the first section 251 and the second section 253, and the first section 251 and the second section 253 rotate relative to each other. In addition, the guide groove 213 has a first top surface 213a and a second top surface 213b adjacent to each other, wherein the second top surface 213b is higher than the first top surface 213a, and the first top surface 213a and the second top surface 213b may be connected to each other as a plane, an inclined plane, or a curved plane, and the first top surface 213a and the second top surface 213b form an angle smaller than 90 degrees. In practical applications, the first segment 251 of the pressing handle 250 can be pushed to be inserted into the guiding groove 213, and when the first segment 251 moves from the second top surface 213b to the first top surface 213a, the first segment 251 pushes against the first top surface 213a and generates a reaction force to drive the rotating shaft 255 to press the door 230, so that the airtight cover 200 is in an airtight state (please refer to fig. 5 and 7 together, fig. 7 is an enlarged view of the dashed frame S3 in fig. 5). Next, when the first segment 251 is far away from the first top surface 213a (for example, when the pressing handle 250 is pushed and the first segment 251 moves along the first top surface 213a to the second top surface 213 b), the reaction force generated by the first top surface 213a on the first segment 251 disappears, so that the rotation axis 255 is released from the door 230 and the airtight cover 200 is released from the airtight state (refer to fig. 6 and 8, fig. 8 is an enlarged view of the dashed frame S4 in fig. 6).

Specifically, the fixing frame 210 may be made of a metal material, an alloy material, or a polymer material with high rigidity, such as steel, aluminum, an aluminum alloy, or plastic. In addition, the guide groove 213 of the fixing frame 210 can be manufactured by a cutting process or laser cutting, and the invention is not limited thereto. The shape of the door body 230 corresponds to the shape of the through hole 211 of the fixing frame 210, wherein the door body 230 may be square or rectangular, the through hole 211 may also be square or rectangular, and the door body 230 is slightly larger than the through hole 211, so that when the door body 230 covers the through hole 211, the door body 230 completely covers the through hole 211. In addition, the door 230 has an outer frame and a transparent sheet, wherein the outer frame surrounds the transparent sheet, so that a user can directly view the inner space of the container 100 through the door 230. In addition, the outer frame may include metal, alloy or polymer (e.g., steel, aluminum alloy or plastic with high rigidity), and the transparent sheet may include transparent glass or transparent polymer material, which is not limited by the invention.

In some embodiments of the present invention, the fixing frame 210 further includes two sidewalls 214 and two sliding rails 215, the two sidewalls 214 are respectively disposed at two corresponding sides of the through hole 211 and extend from the upper surface of the fixing frame 210, the guide groove 213 and the sliding rail 215 are at least disposed at one side of the sidewall 214 facing the through hole 211, and the door 230 is disposed between the two sidewalls 214 and slidably connected between the two sliding rails 215. In other embodiments of the present invention, the guide groove 213 and the sliding rail 215 may also extend from the front surface of the side wall 214 facing the through hole 211 to the rear surface of the side wall 214, so that the pressing handle 250 can be smoothly forced to rotate after the first segment 251 is inserted into the guide groove 213, but the present invention is not limited thereto.

Please refer to fig. 4. Fig. 4 is a partially enlarged view of the door 230 according to a dashed box S2 in fig. 2. In some embodiments of the present invention, the door body 230 has a protrusion 231, and the protrusion 231 is inserted into the sliding rail 215 so that the door body 230 moves relative to the sliding rail 215. Further, the door body 230 further includes a bearing 233 (bearing), and the bearing 233 is disposed on the boss 231 and configured to roll in the sliding rail 215. In practical applications, the protruding portion 231 and the bearing 233 facilitate the door 230 to move close to the fixing frame 210.

In some embodiments of the present invention, the door body 230 further includes a handle 234, wherein the handle 234 and the protrusion 231 are disposed on opposite sides of the door body 230, and the user can operate the handle 234 and lift or move the door body 230, wherein when the user moves the door body 230 or rotates the door body 230 relative to the protrusion 231, the sliding rail 215 simultaneously supports the protrusion 231, such that the protrusion 231 serves as a supporting point of the door body 230, and thus the user can move or rotate the door body 230 with less effort.

Specifically, the sliding rail 215 is substantially in an inverted U shape, and the sliding rail 215 is higher than the upper surface of the fixing frame 210 and the through hole 211, wherein the heights of the two first portions 215a of the sliding rail 215 with respect to the upper surface of the fixing frame 210 and the through hole 211 are gradually increased toward the center of the sliding rail 215, and thus the first portions 215a are higher than the fixing frame 210 and extend obliquely to the upper surface of the fixing frame 210. In addition, the height of the second portion 215b of the sliding rail 215 with respect to the through hole 211 is constant, wherein the second portion 215b communicates with the higher ends of the second portions 215a and is located between the second portions 215a, so that the height of the first portions 215a with respect to the upper surface of the fixing frame 210 and the through hole 211 increases toward the second portion 215 b. In addition, the door 230 can move obliquely (including horizontal movement and vertical movement) along the first portion 215a of the sliding track 215, and the door 230 can also move horizontally along the second portion 215b of the sliding track 215, wherein the door 230 can also be pushed to move between the first portion 215a and the second portion 215 b.

In practical applications, the door 230 is toward or away from the lowest end of the first portion 215a, so that the air-tight cover 200 is in the closed state or the open state, and the door 230 can move toward the through hole 211 along the first portion 215a and cover or be away from the through hole 211. Referring to fig. 5 or fig. 6, the door 230 is located at the lowest end of the first portion 215a, and at this time, the door 230 is located at the closing height, so that the airtight cover 200 is in the closed state. Referring to fig. 9, the door 230 can move along the first portion 215a away from the through hole 211 and expose the through hole 211, the door 230 is located at the highest end or the second portion 215b of the first portion 215a, and at this time, the door 230 is located at an opening height, so that the airtight cover 200 is in an open state. In addition, the opening height of the door 230 is greater than the thickness of the other door 230, so that one of the two doors 230 can move to a position above the other of the two doors 230 along the sliding rail 215 at the opening height, so that the two doors 230 are partially overlapped when viewed from above, and the two doors 230 can be substantially parallel to each other at the closing height and the opening height of the two doors 230, so that the space required for opening the doors 230 or closing the two doors 230 is very small.

In some embodiments of the present invention, the plurality of guide grooves 213 are lower than the second portion 215b of the sliding rail 215, and the plurality of guide grooves 213 are disposed between the two first portions 215a, so that when the door body 230 is located at the second portion 215b and covers the through hole 211 at the closing height, the pressing handle 250 pushes against the guide grooves 213 to press the door body 230, thereby avoiding interference of the door body 230 when the pressing handle 250 rotates, but the present invention is not limited thereto.

In some embodiments of the present invention, the door body 230 includes two sliding rails 235 and two sliding blocks 237 extending in parallel, wherein the sliding rails 235 are disposed on the upper surface of the door body 230, the sliding blocks 237 are disposed on the lower surface of the door body 230, and the sliding rails 235 extend from one edge of the door body 230 to another corresponding edge of the door body 230 (for example, two opposite edges of the door body 230), so that the sliding rails 235 can reinforce the door body 230 and improve the mechanical strength of the door body 230. Referring to fig. 6 and 9, one of the two door bodies 230 may move above the other of the two door bodies 230 along the sliding rail 215, so that the sliding block 237 of one of the two door bodies 230 is slidably connected to the sliding rail 235 of the other of the two door bodies 230, and thus the two door bodies 230 may be stacked up and down to support each other, which is beneficial for the two door bodies 230 to move horizontally relative to each other. Specifically, the sliding block 237 may be provided with a roller mechanism, so that the sliding block 237 moves on the sliding rail 235 via a roller.

Referring to fig. 10, fig. 10 is a cross-sectional view of the fixing rod 270 according to the cross-sectional line X in fig. 2. In some embodiments of the present invention, the airtight cover 200 includes a fixing rod 270, the fixing rod 270 is detachably connected to the fixing frame 210, and the fixing rod 270 is configured to be fixed between the two through holes 211 and cross two opposite sides of the through holes 211, wherein the fixing rod 270 has a T-shaped cross section and can fix the two door bodies 230 to the fixing frame 210 from a lateral direction and from above. In addition, the pressing handle 250 may be disposed on the fixing rod 270 and presses the fixing rod 270, and then the pressing handle 250 presses the door 230 through the fixing rod 270, so that the airtight cover 200 may further provide an excellent airtight function and enhance the overall mechanical strength through the combination of the pressing handle 250 and the fixing rod 270.

Please refer to fig. 2 and fig. 3. In some embodiments of the present invention, the airtight cover 200 includes a fixing latch 280, at least a portion of the fixing latch 280 is disposed at a side of the door 230 and configured to move vertically to fix the door 230 to the fixing frame 210, wherein the fixing latch 280 includes a rotating hook 281 and a fixing hook 283, the rotating hook 281 is configured to selectively fix the fixing hook 283, the rotating hook 281 is disposed at a side of the door 230, and the fixing hook 283 is disposed on the fixing frame 210 and adjacent to an edge of the through hole 211. Specifically, the rotating hook 281 comprises a C-shaped portion 281a, a handle 281b and a rotating shaft 281c, the C-shaped portion 281a is rotatably connected to the rotating shaft 281C, and the handle 281b is disposed at an end of the C-shaped portion 281a, wherein the handle 281b is configured to be pushed to drive the C-shaped portion 281a to rotate relative to the rotating shaft 281C, so that the C-shaped portion 281a is further fixed to or separated from the fixing hook 283, and the door 230 can be fixed to or detached from the fixing frame 210. Therefore, the user can simply rotate the fixing latch 280 along the vertical plane to lock the door 230 to the fixing frame 210. Compared with the conventional fixing structure, the rotating hook 281 of the fixing lock 280 can only rotate along the vertical plane and hook the fixing hook 283, so that the fixing lock 280 has a substantially space-saving function.

In other embodiments of the present invention, the airtight cover 200 does not include the side wall 214 and the sliding rail 215, wherein the door body 230 is detachably fixed to the fixing frame 210. Therefore, the user can place the door 230 separated from the fixing frame 210 on the fixing frame 210, and then fix the fixing frame 210 and the door 230 to each other through the fixing lock 280. Then, the user applies pressure to the door 230 by using the pressing handle 250, so that the airtight cover 200 is in an airtight state. In addition, after the user releases the airtight state of the airtight cover 200 through the pressing handle 250, the user may further unlock the fixing latch 280, so that the door 230 is in a state of being detachable from the fixing frame 210, and the user may conveniently remove the door 230 from the fixing frame 210.

Please refer to fig. 5 to 8. In some embodiments of the present invention, the airtight cover 200 includes a connecting rod 290, and the second segment 253 of the plurality of pressure handles 250 is rotatably connected to the connecting rod 290, so that a user can push the connecting rod 290 to simultaneously move the plurality of pressure handles 250 and pressurize or release the pressure to the door 230, thereby efficiently keeping the airtight cover 200 in an airtight state and preventing air leakage.

While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. Many modifications may be made to the disclosed embodiments in light of the disclosure herein without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments.

Claims

1. An airtight device, comprising:

a container; and

an airtight cover disposed on the container, wherein the airtight cover includes:

the fixing frame is provided with at least one through hole and at least one guide groove, wherein the through hole is communicated with the inner space of the container, the guide groove is provided with a first top surface and a second top surface which are adjacent, and the second top surface is higher than the first top surface;

at least one door body selectively covering the through hole; and

the pressurizing handle is pivotally connected to the door body and comprises a first section, a second section and a rotating shaft center, the rotating shaft center is located between the first section and the second section, the first section and the second section are configured to rotate relative to each other, and the second section is configured to be stressed to drive the first section to move from the lower part of the second top surface to the lower part of the first top surface, so that the rotating shaft center pressurizes the door body.

2. The airtight device as claimed in claim 1, wherein the fixing frame further comprises a sliding rail, the door body has a protrusion inserted into the sliding rail, the sliding rail is higher than the through hole and the first portion of the sliding rail is tapered with respect to the height of the through hole, and wherein the door body is configured to be toward or away from the lowest end of the first portion such that the door body is at a closing height or an opening height.

3. The airtight device according to claim 2, wherein a second portion of the sliding rail is constant in height with respect to the through hole, the second portion communicating with a higher end of the first portion.

4. The door seal of claim 2, wherein the door bearing is disposed on the boss.

5. The airtight device according to claim 1, wherein the airtight cap includes a connecting rod, the airtight cap includes a plurality of the pressurizing handles, and the second sections of the pressurizing handles are rotatably connected to the connecting rod.

6. The airtight device of claim 1, wherein the airtight cover includes a fixing latch, at least a portion of which is disposed at a side of the door body and configured to move vertically to fix the door body to the fixing frame.

7. The door as claimed in claim 1, wherein the at least one door comprises two doors, each door comprising a track and a slider, and wherein one of the two doors is configured to move over the other door such that the slider of the one door is slidably coupled to the track of the other door.

8. An airtight device, comprising:

a container; and

the airtight lid sets up on this container, and wherein this airtight lid includes:

the fixing frame is provided with two through holes and a plurality of guide grooves, the through holes are communicated with the inner space of the container, each guide groove is provided with a first top surface and a second top surface which are adjacent, and the second top surface is higher than the first top surface;

the two door bodies selectively and respectively cover the two through holes; and

and the second section is configured to be stressed to drive the first section to move from the second bottom surface to the first top surface so that the rotating shaft core presses one of the two door bodies.

9. The airtight device according to claim 8, wherein the fixing frame further comprises sliding rails, each of the two doors has a boss inserted into the sliding rail, the sliding rail is higher than the through hole and the two first portions of the sliding rail have increasing heights with respect to the through hole, and wherein the two doors are used to be toward or away from the lowest ends of the two first portions such that the two doors are at a closed height or an open height.

10. The airtight device according to claim 9, wherein a second portion of the sliding rail, which communicates with a higher end of the first portions and is located between the first portions, has a constant height with respect to the through hole.

11. The airtight device according to claim 9, wherein each of said two door bodies has a bearing provided to said boss portion.

12. The airtight device according to claim 8, wherein the airtight cover comprises a fixing rod connected to the fixing frame and disposed between the through holes, wherein the fixing rod has a T-shaped cross section and is used to fix the two door bodies from the side and above.

13. The door as claimed in claim 8, wherein the airtight cover comprises a fixing latch, at least a portion of which is disposed at a side of the door body, and the fixing latch is configured to move vertically to fix the door body to the fixing frame.

14. The door-sealing apparatus of claim 8, wherein each of the two door bodies comprises a slide rail and a slider, and wherein one of the two door bodies is configured to move over the other of the two door bodies such that the slider of the one of the two door bodies is slidably coupled to the slide rail of the other of the two door bodies.