High-sealing anti-frosting self-locking thermal insulation door for ship refrigerator

Abstract

This invention relates to the field of cold storage insulated doors, specifically disclosing a high-sealing, anti-frost self-locking insulated door for marine cold storage, comprising: a door frame, a labyrinth-type sealing groove, an insulated door, a sliding groove, and a storage groove. The inner wall of the door frame has a labyrinth-type sealing groove circumferentially formed, and the insulated door is rotatably mounted within the inner cavity of the door frame via hinges. This device fundamentally prevents cold air leakage to eliminate frost formation on the sealing surface, uses pneumatic pressure instead of rubber elasticity to achieve lifelong self-compensation of the sealing pressure, provides auxiliary self-locking and vibration damping effects through the interlocking of an inflatable sealing gasket and the labyrinth-type sealing groove, utilizes pressure difference drive to achieve automatic air replenishment compensation of the sealing pressure, and provides a purely mechanical visual monitoring method for the sealing status. It solves the prominent problems of frost formation on the sealing surface, aging and failure of the sealing strip, wear during closing, and lack of coordinated sealing and locking under vibration conditions in existing marine cold storage insulated doors.

Description

Technical Field

[0001] This invention relates to the field of cold storage insulation door technology, specifically a high-sealing, anti-frost self-locking insulation door for marine cold storage. Background Technology

[0002] Insulated doors for ship cold storage are key equipment in the ship's cold chain system. Installed at the entrance of the ship's cold storage, they are used to isolate the low-temperature environment inside the cold storage from the high-temperature and high-humidity environment outside, preventing the loss of cold energy and maintaining the stability of the internal temperature. Unlike land-based cold storage, ship cold storage is subjected to harsh conditions such as salt spray, humidity, hull vibration, and rolling during navigation. This places more stringent technical requirements on the sealing performance, durability, and operational reliability of the insulated doors. Ship cold storage insulated doors are usually composed of a door frame, an insulated door leaf, and rubber sealing strips arranged around the door leaf or door frame. When the door is closed, the sealing strips and the door frame are pressed together to form a sealing surface, blocking the exchange of gases between the inside and outside of the cold storage. However, existing ship cold storage insulated doors generally have the following problems in actual use; First, the problem of frost formation on the sealing surface is serious and difficult to eliminate. When the existing insulated door is closed, the sealing strip and the door frame rely on the elasticity of the rubber itself to form a contact seal. However, due to the unavoidable slight shape and position deviations between the door leaf and the door frame during manufacturing and installation, and the vibration and hull deflection during ship navigation, there are always tiny gaps that are difficult to detect with the naked eye between the sealing strip and the door frame. These tiny gaps become channels for cold air to leak out. The continuous leakage of cold air causes the temperature of the sealing surface in the gap area to drop significantly. When the hot and humid outside air comes into contact with this low-temperature sealing surface, water vapor quickly condenses into frost. Once frost forms, the frost layer will continue to thicken and gradually fill or even enlarge the gap, which not only further damages the sealing effect, but may also freeze the sealing strip to the door frame, making it difficult to open the door. This problem is particularly prominent in the frequent opening and closing operations of ship cold storage. Secondly, the loss of elasticity of the sealing strip leads to sealing failure. The existing sealing strips of insulated doors rely entirely on the elastic rebound force of the rubber material itself to maintain the contact pressure with the door frame. In the long-term use of ship cold storage, the sealing strips need to withstand the mechanical stress of closing and opening. In addition, the chemical corrosion of the rubber material by the salt spray environment will cause the rubber to gradually harden, lose elasticity and undergo permanent deformation. Once the elasticity of the sealing strip is lost, the contact pressure it applies to the door frame will decrease, the sealing surface will no longer fit tightly, the amount of cold air leakage will gradually increase, and eventually the seal will fail completely. At this time, the sealing strip must be replaced to restore the sealing performance of the insulated door. However, the replacement of the sealing strip is complicated to operate in the limited space of the ship and the maintenance cost is high. Third, there is a problem of wear on the sealing strip during the closing process. Some existing insulated doors designed to improve the sealing effect have adopted solutions such as increasing the cross-sectional size of the sealing strip or increasing the closing clamping force, so that the sealing strip makes a large interference squeeze contact with the door frame when closing. However, this design leads to severe friction contact between the sealing strip and the door frame during the closing process, resulting in high closing resistance and difficult operation. Moreover, the surface of the sealing strip is subjected to friction and wear with each closing. After long-term use, the surface of the sealing strip will show wear, cracks or even tears, which seriously shortens the service life of the sealing strip and reduces the reliability of the seal. Fourth, the dual deficiencies of sealing and locking under ship vibration conditions. Ship cold storage is subjected to continuous vibration and swaying during navigation. Although ordinary mechanical latches can prevent the door from opening by itself, they cannot prevent the door from making a small relative displacement between the door and the door frame under vibration excitation. This micro-movement will cause intermittent small gaps in the sealing surface, forming a breathing effect. That is, the hot and humid air from the outside is sucked into the gap of the sealing surface during the vibration negative pressure, which accelerates frost formation and reduces the sealing effect. The existing sealing structure and locking structure of insulated doors are usually two independent systems with a lack of functional integration, which cannot work together to cope with the unique vibration conditions of ships. In summary, existing ship cold storage insulated doors have significant technical deficiencies in areas such as preventing frost formation on the sealing surface, long-term durability of the sealing strips, wear during closing operations, and the coordination of sealing and locking under vibration conditions. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art, such as the sealing surface being prone to frost due to cold air leakage, the sealing strip's elasticity decay leading to sealing failure, severe friction and wear between the sealing strip and the door frame during the closing process, and the sealing and locking functions being independent and unable to work together under ship vibration conditions. The invention proposes a high-sealing, anti-frost self-locking insulated door for ship cold storage.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-sealing, anti-frost self-locking insulated door for marine cold storage, comprising: a door frame, a labyrinth-type sealing groove, an insulated door, a sliding groove, a storage groove, an inflatable sealing gasket, an inflation mechanism, and a leak detection mechanism. The inner wall of the door frame is provided with a labyrinth-type sealing groove along its circumference. The insulated door is rotatably mounted within the inner cavity of the door frame via hinges. Four sliding grooves are equidistantly spaced along the circumference on both the front and rear sides of the inner cavity of the insulated door. The outer wall of the insulated door is provided with a storage groove along its circumference, the position of which corresponds to the position of the labyrinth-type sealing groove. Sealing strips are provided on both the front and rear sides of the outer wall of the insulated door. The inflatable sealing gasket is located within the inner cavity of the storage groove. The inflation mechanism is located within the inner cavity of the insulated door. The leak detection mechanism is located on the front side of the insulated door.

[0005] Furthermore, the inflation mechanism includes a drive assembly, an execution assembly, and a braking assembly. The drive assembly is disposed on the rear side of the inner cavity of the heat preservation door, the execution assembly is disposed on the inner cavity of the drive assembly, and the braking assembly is disposed on the front side of the drive assembly. The braking assembly is used to drive the drive assembly to rotate and to fix the drive assembly.

[0006] Furthermore, the drive assembly includes: a mounting base, a limiting slide groove, a drive disk, and a drive slot. The mounting base is located in the middle of the rear side of the inner cavity of the heat preservation door. Four limiting slide grooves are equidistantly provided along the circumferential direction on the rear side of the inner cavity of the mounting base. The drive disk is rotatably disposed on the front side of the inner cavity of the mounting base via a bearing. Four drive slots are equidistantly provided along the circumferential direction on the front side of the drive disk. The four drive slots correspond one-to-one with the four limiting slide grooves.

[0007] Furthermore, the actuating component includes: a drive rod, a drive column, an air supply unit, a piston rod, a first piston, an air filling piston cylinder, and a first air pipe. There are four drive rods, each equidistantly and circumferentially fitted into the inner cavity of the mounting base. The positions of the four drive rods correspond one-to-one with the positions of four limiting slide grooves. The outer ends of the four drive rods can slidably extend out of the outer wall of the mounting base. There are eight drive columns, each located on the inner ends of the front and rear sides of the four drive rods. The eight drive columns can slidably and equidistantly fit into the inner cavities of the limiting slide grooves and drive grooves corresponding to their positions. The gas replenishment unit is located at the outer end of the drive rod, the piston rod is located at the outer end of the gas replenishment unit, the first piston is located at the outer end of the piston rod, and there are four gas-filled piston cylinders. The four gas-filled piston cylinders are equidistantly arranged circumferentially on the rear side of the inner cavity of the heat preservation door. The four first pistons are slidably fitted into the inner cavities of the four gas-filled piston cylinders. The outer side of the inner cavity of the gas-filled piston cylinders is filled with atmospheric pressure nitrogen. One end of the first gas pipe is located at the outer end of the gas-filled piston cylinder, and the inner cavity of the first gas pipe is connected to the inner cavity of the gas-filled piston cylinder. The other ends of the four first gas pipes are respectively located on the four sides of the inflatable sealing gasket.

[0008] Furthermore, the air replenishment unit includes: a pressure cylinder, a slider, an air nozzle, and a second piston. The pressure cylinder is disposed at the outer end of the drive rod. There are eight sliders, which are respectively disposed on the front and rear sides of the four pressure cylinders. The eight sliders are slidably fitted into the inner cavities of the eight sliding grooves. The air nozzle is disposed on the inner side of the pressure cylinder, and the inner cavity of the air nozzle is connected to the inner cavity of the pressure cylinder. The second piston is slidably fitted into the outer side of the inner cavity of the pressure cylinder. The inner end of the piston rod is disposed at the middle of the outer side of the second piston, and the outer end of the piston rod slidably extends out of the outer side of the pressure cylinder.

[0009] Furthermore, the inner cavity of the pressure cylinder is filled with high-pressure nitrogen gas.

[0010] Furthermore, the leak detection mechanism includes: a second air tube, a pressure piston cylinder, a third piston, a scale rod, scale lines, a second spring, and a scale ring. One end of the second air tube is disposed on the outer wall of the air nozzle, and the inner cavity of the second air tube is connected to the inner cavity of the air nozzle. The other end of the second air tube extends out from the front side of the heat preservation door. There are four pressure piston cylinders, which are equidistantly arranged circumferentially on the front side of the heat preservation door. The other end of the second air tube is disposed at the inner end of the pressure piston cylinder, and the inner cavity of the pressure piston cylinder is connected to the inner cavity of the second air tube. The third piston is slidable. The movable, compatible fitting is inserted into the inner cavity of the pressure piston cylinder. The scale rod is located at the middle of the outer side of the third piston. The outer end of the scale rod extends slidably out of the inner cavity of the pressure piston cylinder. The outer wall of the scale rod is provided with scale lines. The second spring is sleeved on the outer wall of the scale rod. One end of the second spring is engaged with the outer wall of the third piston, and the other end of the second spring is engaged with the inner wall of the pressure piston cylinder. There are four scale rings. The four scale rings are equidistantly arranged circumferentially on the front side of the heat preservation door. The four scale rings are slidably and compatiblely fitted to the outer walls of the four scale rods.

[0011] Furthermore, when the drive disc rotates, the drive groove pushes the drive column to slide radially outward or inward along the limiting slide groove, the drive column drives the drive rod to move radially, and the drive rod drives the first piston to slide inside the inflatable piston cylinder through the air replenishment unit and the piston rod, so as to realize the inflation or deflation of the inflatable sealing gasket.

[0012] Furthermore, when the gas pressure inside the inflatable sealing gasket decreases due to encountering cold air in the cold storage, the second piston slides outward along the inner cavity of the pressure cylinder under the action of pressure difference. The second piston pushes the first piston outward along the inner cavity of the inflatable piston cylinder through the piston rod. The first piston replenishes the inflatable sealing gasket with atmospheric pressure nitrogen outside the inner cavity of the inflatable piston cylinder through the first gas pipe, thereby achieving automatic compensation of sealing pressure.

[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) When the present invention is working, the operator only needs to close the heat preservation door and rotate the handwheel. The handwheel drives the drive plate to rotate through the rotating rod. The arc-shaped drive groove on the drive plate pushes the drive column to slide radially outward along the limiting slide groove. The drive column drives the drive rod, the air replenishment unit, the piston rod and the first piston to move outward synchronously. The atmospheric pressure nitrogen in the air-filled piston cylinder is pressed into the air-filled sealing gasket through the first air pipe, so that the air-filled sealing gasket expands and fills the labyrinth-type sealing groove of the door frame. This realizes the action sequence of closing the door first and then sealing. During the closing process, the sealing gasket is in a contracted state and has no frictional contact with the door frame. This eliminates the wear problem caused by the severe friction between the sealing strip and the door frame when the traditional heat preservation door is closed. At the same time, it reduces the resistance of closing operation and improves the ease of use.

[0014] (2) After the inflatable sealing gasket expands and fills the labyrinth sealing groove, the sealing gasket and the tortuous wall of the labyrinth sealing groove form a multi-fold sealing interface. The path of cold air leakage is greatly extended, and the leakage resistance is multiplied. The cold air leakage channel is blocked from the source, so that the sealing surface area cannot form a low temperature and high humidity environment, thereby effectively preventing the sealing surface from frosting. At the same time, the expansion driving force of the sealing gasket comes from the pneumatic pressure rather than the elasticity of the rubber itself. Even if the rubber material of the sealing gasket hardens or loses elasticity after long-term use, the pneumatic pressure can still continuously press it on the sealing surface, realizing the lifelong self-compensation of sealing pressure and extending the effective service life of the sealing gasket.

[0015] (3) After inflation is completed, the ratchet and pawl on the rotating rod automatically engage and lock under the action of the first spring, preventing the drive disc from rotating in the opposite direction, thereby maintaining the expansion state of the inflatable sealing gasket. The mechanical self-locking of the ratchet and pawl and the auxiliary locking force generated after the inflatable sealing gasket is embedded in the labyrinth sealing groove work together to prevent the door leaf from loosening due to ship vibration, and absorb vibration energy through the flexible damping effect of the air-expanded sealing gasket, effectively suppressing the breathing effect of intermittent small gaps in the sealing surface under vibration conditions. The sealing and locking functions are integrated and coordinated.

[0016] (4) When the nitrogen in the gas-filled sealing gasket shrinks due to contact with the low temperature environment of the cold storage, resulting in a drop in sealing pressure, the high-pressure nitrogen pre-filled in the pressure cylinder of the gas replenishment unit automatically forms a pressure difference with the sealing gasket pipeline. This pressure difference pushes the second piston to slide outward, and through the piston rod, it further pushes the first piston to move outward in the gas-filled piston cylinder, automatically replenishing nitrogen into the gas-filled sealing gasket until the sealing pressure is restored to balance. This automatic gas replenishment process is entirely driven by the pressure difference, without the need for manual intervention or any electronic components, ensuring that the gas-filled sealing gasket maintains a stable sealing pressure during long-term operation and temperature fluctuations in the ship's cold storage, eliminating the hidden danger of sealing pressure decay caused by gas shrinkage.

[0017] (5) In this invention, the operator can intuitively judge whether the sealing pressure in the gas-filled sealing gasket is within the normal range by observing the relative position of the scale line on the scale rod and the scale ring in the gas leakage detection mechanism on the front side of the heat-insulating door. The scale rod is driven by the third piston to overcome the elastic force of the second spring under the action of sealing pressure. Any change in sealing pressure can be reflected in real time by the displacement of the scale line, providing the operator with a simple, reliable, and electronically-free pure mechanical means of monitoring the sealing status, which is convenient for daily inspection and timely maintenance.

[0018] (6) When the door needs to be opened, the operator releases the self-locking by disengaging the pawl, rotates the handwheel in the opposite direction, the drive disc rotates in the opposite direction, and the drive groove pulls the drive column radially inward along the limiting slide groove, driving the drive rod, the air replenishment unit, the piston rod and the first piston to move inward synchronously. The nitrogen in the inflatable sealing gasket is drawn back to the inflatable piston cylinder through the first air pipe. The inflatable sealing gasket deflates and collapses and is returned to the storage groove, completely disengaging from the labyrinth sealing groove. The heat preservation door is free again, and the operator can easily open the door. The entire degassing process is also completed in one go by rotating the handwheel in the opposite direction, making the operation smooth and convenient.

[0019] In summary, this device fundamentally blocks cold air leakage to eliminate the conditions for frost formation on the sealing surface. It uses pneumatic pressure instead of rubber elasticity to achieve lifelong self-compensation of sealing pressure. The interlocking of the inflatable sealing gasket and the labyrinth sealing groove provides auxiliary self-locking and vibration damping effects. It utilizes pressure difference drive to achieve automatic air replenishment compensation of sealing pressure and provides a purely mechanical means of visual monitoring of the sealing status. It comprehensively solves the prominent problems of frost formation on the sealing surface of existing ship cold storage insulated doors, aging and failure of sealing strips, wear when closing the door, and lack of coordination in sealing and locking under vibration conditions. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 An exploded view of a leak detection facility; Figure 4 A diagram showing the scale rod of a leak detection mechanism; Figure 5 This is a schematic diagram of the inflation mechanism; Figure 6 An exploded view of the inflation mechanism; Figure 7 for Figure 6 Enlarged view of point A; Figure 8 for Figure 6 Enlarged view of point B.

[0022] The components represented by each number in the diagram are listed below: 1. Door frame; 2. Labyrinth seal groove; 3. Insulated door; 4. Slide groove; 5. Storage groove; 6. Inflatable sealing gasket; 7. Inflating mechanism; 71. Drive assembly; 711. Mounting base; 712. Limiting slide groove; 713. Drive disc; 714. Drive groove; 72. Actuation assembly; 721. Drive rod; 722. Drive column; 723. Air supply unit; 7231. Pressure cylinder; 7232. Slider; 7233. Air nozzle; 7234. 724. Second piston; 725. Piston rod; 726. First piston; 727. Inflatable piston cylinder; 728. First air pipe; 73. Braking assembly; 731. Rotating rod; 732. Ratchet; 733. Connecting rod; 734. Pawl; 735. Baffle; 736. First spring; 737. Handwheel; 8. Leakage detection mechanism; 81. Second air pipe; 82. Pressure piston cylinder; 83. Third piston; 84. Scale rod; 85. Scale line; 86. Second spring; 87. Scale ring. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Reference Figures 1-8A high-sealing, anti-frost self-locking insulated door for marine cold storage includes: a door frame 1, a labyrinth-type sealing groove 2, an insulated door 3, a sliding groove 4, a storage groove 5, an inflatable sealing gasket 6, an inflation mechanism 7, and a leak detection mechanism 8. The inner wall of the door frame 1 has a labyrinth-type sealing groove 2 circumferentially formed. The door frame 1 is existing technology and will not be described in detail here. The door frame 1 is fixedly installed at the entrance of the marine cold storage, serving as the installation base for the insulated door 3. Its inner wall has a labyrinth-type sealing groove 2 circumferentially formed, which interlocks with the inflatable sealing gasket 6 after inflation, forming a multi-fold labyrinth-type sealing interface. The labyrinth-type sealing groove 2 has a trapezoidal cross-section with a narrow opening and a wide bottom. When the inflatable sealing gasket 6 is inflated, it fills the... During operation, the expanding sealing gasket forms an inverted wedge shape within the groove, and the groove opening secures the sealing gasket, ensuring a tighter fit between the gasket and the groove as the internal air pressure increases. This also extends the path for cold air leakage, increasing leakage resistance. The insulated door 3 is rotatably mounted within the door frame 1 via hinges. Four circumferentially spaced sliding grooves 4 are provided on both the front and rear sides of the inner cavity of the insulated door 3. A circumferentially spaced storage groove 5 is provided on the outer wall of the insulated door 3, with the positions of the storage grooves 5 corresponding to the positions of the labyrinthine sealing grooves 2. Sealing strips are provided on both the front and rear sides of the outer wall of the insulated door 3. The insulated door 3 is existing technology and will not be described in detail here. The insulated door 3 can accommodate an inflation mechanism 7, a leak detection mechanism 8, and an inflatable sealing mechanism. The gasket 6 provides installation and storage space. Four equidistant sliding grooves 4 are formed on both the front and rear sides of the inner cavity of the insulated door 3, guiding the radial sliding of the air replenishment unit 723. A storage groove 5 is formed on the outer wall of the insulated door 3, used to store the inflatable sealing gasket 6 when not inflated, preventing frictional contact between the gasket and the door frame 1 during closing. The inflatable sealing gasket 6 is located within the storage groove 5 and is made of flexible, airtight rubber material. When not inflated, it contracts within the storage groove 5; when inflated, it expands and bulges out, filling the labyrinthine sealing groove 2 of the door frame 1, tightly fitting against the curved wall surface of the labyrinthine sealing groove 2 to form a labyrinthine sealing structure, blocking the cold storage from entering or leaving the room. The gas exchange channel includes an inflation mechanism 7 located inside the insulation door 3. The inflation mechanism 7 converts the rotational motion of the operator's handwheel 737 into the radial linear motion of the drive rod 721, thereby driving the first piston 725 to slide within the inflation piston cylinder 726, thus enabling the inflation or deflation of the inflatable sealing gasket 6. The deflation detection mechanism 8 is located on the front side of the insulation door 3. The deflation detection mechanism 8 can transmit the gas pressure inside the inflatable sealing gasket 6 to the pressure piston cylinder 82, driving the third piston 83 and the scale rod 84 to move. The operator can determine whether the sealing pressure is within the normal range by observing the relative position of the scale line 85 and the scale ring 87 on the scale rod 84.

[0025] Specifically, the inflation mechanism 7 includes a drive assembly 71, an execution assembly 72, and a braking assembly 73. The drive assembly 71 is located on the rear side of the inner cavity of the insulation door 3. The drive assembly 71 is the core drive unit of the entire insulation door, responsible for converting the rotational motion of the operator's manual rotation of the handwheel 737 into the radial linear motion of the drive rod 721, thereby driving the first piston 725 to slide within the inflation piston cylinder 726, realizing the inflation or deflation operation of the inflatable sealing gasket 6, and relying on the braking assembly 73 to mechanically lock the inflation state. The execution assembly 72 is located in the inner cavity of the drive assembly 71. The execution assembly 72 is used to receive the radial driving force transmitted by the drive assembly 71. The execution assembly 72 drives the air replenishment unit 723, the piston rod 724, and the first piston 725 through the drive rod 721. 5. Slides within the inflation piston cylinder 726 to compress or draw in the atmospheric pressure nitrogen gas within the inflation piston cylinder 726, thereby inflating or deflating the inflatable sealing gasket 6. It also has an automatic gas replenishment function when the sealing pressure decreases due to gas contraction. The braking assembly 73 is located on the front side of the drive assembly 71. The braking assembly 73 is used to drive the drive assembly 71 to rotate and to fix the drive assembly 71. The operator rotates the handwheel 737 to drive the drive disc 713 to rotate. The ratchet 732 and pawl 734 in the braking assembly 73 form a one-way locking mechanism under the action of the first spring 736. When the handwheel 737 is rotated to the position, it automatically locks the rotation angle of the drive disc 713 to prevent the drive disc 713 from rotating in the opposite direction, thereby continuously maintaining the expansion and sealing state of the inflatable sealing gasket 6.

[0026] Specifically, the drive assembly 71 includes: a mounting base 711, limiting slide grooves 712, a drive disc 713, and a drive groove 714. The mounting base 711 is located in the middle of the rear side of the inner cavity of the heat preservation door 3. Four limiting slide grooves 712 are equidistantly provided along the circumferential direction on the rear side of the inner cavity of the mounting base 711. The mounting base 711 is the basic load-bearing structure of the drive assembly 71. The mounting base 711 provides bearing mounting support for the drive disc 713, and at the same time provides radial sliding space for the drive rod 721 and the drive column 722. The four limiting slide grooves 712 are equidistantly provided along the circumferential direction on the rear side of its inner cavity. 12 is used to constrain the movement direction of the drive column 722. The drive disk 713 is rotatably mounted on the front side of the inner cavity of the mounting base 711 via a bearing. The front side of the drive disk 713 has four drive grooves 714 equidistantly spaced along the circumference. The four drive grooves 714 correspond one-to-one with the four limiting slide grooves 712. The drive disk 713 is driven to rotate by the rotating rod 731 in the braking assembly 73. When the drive disk 713 rotates, the arc-shaped contour of the drive groove 714 exerts a pushing force on the drive column 722. It is a key component for realizing the conversion of rotational motion to radial linear motion.

[0027] Specifically, the actuation component 72 includes: drive rods 721, drive columns 722, air supply unit 723, piston rod 724, first piston 725, air filling piston cylinder 726, and first air pipe 727. There are four drive rods 721, which are equidistantly inserted into the inner cavity of the mounting base 711 along the circumferential direction. The positions of the four drive rods 721 correspond one-to-one with the positions of the four limiting slide grooves 712. The outer ends of the four drive rods 721 can slidably extend out of the outer wall of the mounting base 711. The drive rods 721 are the main force transmission components in the actuation component 72. There are eight drive columns 722, which are respectively located on the inner ends of the front and rear sides of the four drive rods 721. The eight drive columns 722 can slidably extend out of the outer wall of the mounting base 711. The corresponding limiting groove 712 and driving groove 714 are fitted into the inner cavity of the corresponding position. The driving column 722 is the motion transmission hub between the driving disk 713 and the driving rod 721. Under the combined action of the arc-shaped surface of the driving groove 714 and the linear constraint of the limiting groove 712, the driving column 722 converts the rotational motion of the driving disk 713 into the radial linear motion of the driving rod 721. The air replenishment unit 723 is set at the outer end of the driving rod 721. When the gas in the inflatable sealing gasket 6 causes the sealing pressure to drop due to cold contraction, the air replenishment unit 723 uses the pressure difference between the high-pressure nitrogen in the pressure cylinder 7231 and the sealing gasket pipeline to automatically push the second piston 7234 and the piston rod 724 to replenish the gas and maintain the stability of the sealing pressure. The piston rod 7234... 4. Located at the outer end of the gas replenishment unit 723, the piston rod 724 transmits the radial movement of the drive rod 721 and the gas replenishment unit 723 to the first piston 725, driving the first piston 725 to slide within the inflation piston cylinder 726 to perform inflation or deflation operations. The first piston 725 is located at the outer end of the piston rod 724. When the first piston 725 slides outward under the push of the piston rod 724, it compresses the atmospheric pressure nitrogen gas in the inflation piston cylinder 726, forcing the nitrogen gas through the first gas pipe 727 into the inflation-type sealing gasket 6 to expand it. When the first piston 725 slides inward, it draws the nitrogen gas in the inflation-type sealing gasket 6 back into the inflation piston cylinder 726, causing the sealing gasket to collapse. There are four inflation piston cylinders 726, which are equidistant from each other along the circumference. Located on the rear side of the inner cavity of the insulation door 3, four first pistons 725 are slidably and compatiblely inserted into the inner cavities of four inflatable piston cylinders 726. The outer side of the inner cavity of the inflatable piston cylinders 726 is filled with atmospheric pressure nitrogen. The inflatable piston cylinders 726 serve as the gas source for inflating the inflatable sealing gasket 6 and as a gas recovery chamber during deflating. The outer end of the inflatable piston cylinders 726 is connected to the inflatable sealing gasket 6 via first air pipes 727. One end of the first air pipe 727 is located at the outer end of the inflatable piston cylinder 726, and the inner cavity of the first air pipe 727 is connected to the inner cavity of the inflatable piston cylinder 726. The other ends of the four first air pipes 727 are respectively located on the four sides of the inflatable sealing gasket 6. The first air pipes 727 serve as gas delivery channels between the inflatable piston cylinders 726 and the inflatable sealing gasket 6.During inflation, atmospheric pressure nitrogen is supplied to each side of the inflatable sealing gasket 6; during deflation, nitrogen is drawn back from the inflatable sealing gasket 6 to the inflation piston cylinder 726.

[0028] Specifically, the gas replenishment unit 723 includes: a pressure cylinder 7231, a slider 7232, a gas nozzle 7233, and a second piston 7234. The pressure cylinder 7231 is located at the outer end of the drive rod 721. The inner cavity of the pressure cylinder 7231 is filled with high-pressure nitrogen gas, and the pressure cylinder 7231 serves as the driving gas source for automatic gas replenishment. The outer cavity accommodates the sliding of the second piston 7234. When the pressure inside the inflatable sealing gasket 6 drops below the high-pressure nitrogen gas pressure due to gas contraction, the high-pressure nitrogen gas in the pressure cylinder 7231 pushes the second piston 7234 to slide outward. The system drives the air replenishment action. Eight sliders 7232 are positioned on the front and rear sides of the four pressure cylinders 7231, respectively. Each slider 7232 is slidably and compatiblely inserted into the inner cavity of one of the eight sliding grooves 4. The sliders 7232 provide sliding guidance and support for the air replenishment unit 723 as it moves radially with the drive rod 721, ensuring accurate and stable movement of the pressure cylinders 7231 and preventing movement jamming due to ship vibration or door deformation. The air nozzle 7233 is located inside the pressure cylinder 7231. The inner cavity of the air nozzle 7233 is connected to the inner cavity of the pressure cylinder 7231. The air nozzle 7233 is used to transmit the gas pressure in the inner cavity of the pressure cylinder 7231 to the leakage detection mechanism 8 through the second air pipe 81, providing a pressure transmission interface for the visual monitoring of the sealing pressure. The second piston 7234 is slidably fitted and inserted into the outer side of the inner cavity of the pressure cylinder 7231. The inner end of the piston rod 724 is located at the middle of the outer side of the second piston 7234, and the outer end of the piston rod 724 slidably extends out of the outer side of the pressure cylinder 7231. The inner side of piston 34 bears the pressure of high-pressure nitrogen in pressure cylinder 7231, and the outer side bears the pressure of the inflatable sealing gasket 6 pipeline transmitted through nozzle 7233 and piston rod 724. When the pressure inside the inflatable sealing gasket 6 decreases due to cold contraction, the pressure difference balance on both sides of the second piston 7234 is broken. High-pressure nitrogen pushes the second piston 7234 to slide outward, and pushes the first piston 725 to automatically replenish gas through piston rod 724. When the sealing pressure is restored to balance with the high-pressure nitrogen pressure, the second piston 7234 stops moving, and the gas replenishment ends automatically.

[0029] Specifically, the braking assembly 73 includes: a rotating rod 731, a ratchet 732, a connecting rod 733, a pawl 734, a baffle 735, a first spring 736, and a handwheel 737. The rotating rod 731 is located at the center of the front side of the drive disc 713, and the front end of the rotating rod 731 rotatably extends out of the front side of the heat preservation door 3. The rotating rod 731 is used to transmit the rotational motion of the handwheel 737 to the drive disc 713, and is the core transmission shaft for transmitting the manual driving force of the operator to the interior of the inflation mechanism 7. The ratchet 732 is sleeved on the outer wall of the rotating rod 731 and locked by a set screw. The outer periphery of the ratchet 732... The device features a one-way toothed groove that engages with the pawl 734 to form a one-way locking mechanism. When the handwheel 737 rotates clockwise to drive the drive disc 713 to complete the inflation operation, the ratchet 732 is engaged by the pawl 734, preventing the rotating rod 731 and the drive disc 713 from rotating in the opposite direction, thereby locking the inflatable sealing gasket 6 in its expanded state. The connecting rod 733 is rotatably mounted on the front side of the insulation door 3 via a bearing. The connecting rod 733 provides mounting support for the pawl 734, allowing it to swing around its own axis, so that the pawl 734 can slide across the tooth surface of the ratchet 732 or engage with the toothed groove under the action of the first spring 736. Pawl 734 is fixedly sleeved on the outer wall of connecting rod 733. Pawl 734 and ratchet 732 are matched. Under the elastic force of first spring 736, pawl 734 is pressed against the tooth surface of ratchet 732. When ratchet 732 rotates counterclockwise, pawl 734 slides across the tooth surface to allow rotation. When ratchet 732 has a tendency to rotate clockwise, pawl 734 engages in the tooth groove to prevent rotation, realizing a one-way locking function. Baffle 735 is set on the front side of heat preservation door 3. Baffle 735 is located below pawl 734 and is used to limit the swing range of pawl 734. One end of first spring 736... The first spring 736 is attached to the front side of the heat preservation door 3. The other end of the first spring 736 is attached to the bottom end of the pawl 734. The first spring 736 is a rotary spring. It undergoes elastic deformation after being squeezed or stretched by external force. After the external force is removed, it returns to its initial state. The first spring 736 is used to provide the pawl 734 with a continuous elastic force pressing against the tooth surface of the ratchet 732, so that the pawl 734 always maintains close contact with the tooth surface of the ratchet 732 when it is not manually opened, ensuring the automatic execution of the one-way locking function. The handwheel 737 is set at the front end of the connecting rod 733. The handwheel 737 is used for the operator to manually hold and rotate it.

[0030] Specifically, the leak detection mechanism 8 includes: a second air pipe 81, a pressure piston cylinder 82, a third piston 83, a scale rod 84, a scale line 85, a second spring 86, and a scale ring 87. One end of the second air pipe 81 is located on the outer wall of the air nozzle 7233, and the inner cavity of the second air pipe 81 is connected to the inner cavity of the air nozzle 7233. The other end of the second air pipe 81 extends out of the front side of the insulation door 3. The second air pipe 81 is a pressure transmission channel, transmitting the gas pressure in the inner cavity of the pressure cylinder 7231 in the air replenishment unit 723 and the gas pressure in the inflatable sealing gasket 6 pipeline to the leak detection mechanism 8. There are four pressure piston cylinders 82, which are equidistantly arranged circumferentially on the front of the insulation door 3. On the other side, the other end of the second air pipe 81 is located inside the pressure piston cylinder 82. The inner cavity of the pressure piston cylinder 82 is connected to the inner cavity of the second air pipe 81. The pressure piston cylinder 82 is used to provide a sliding cavity for the third piston 83. The gas pressure transmitted through the second air pipe 81 is applied to the inner side of the third piston 83, pushing the third piston 83 to slide outward against the elastic force of the second spring 86. The third piston 83 is slidably and appropriately inserted into the inner cavity of the pressure piston cylinder 82. The inner side of the third piston 83 bears the gas pressure of the sealed pipeline transmitted through the second air pipe 81, and the outer side bears the elastic force of the second spring 86. When the sealing pressure is normal, the gas pressure pushes the third piston 83 to move outward to the equilibrium position.When the sealing pressure decreases, the elastic force of the second spring 86 pushes the third piston 83 inward to a new equilibrium position. The displacement of the third piston 83 reflects the change in sealing pressure. The scale rod 84 is located on the outer middle of the third piston 83, and its outer end extends slidably out of the inner cavity of the pressure piston cylinder 82. The outer wall of the scale rod 84 is provided with scale lines 85. The scale rod 84 moves synchronously with the third piston 83, and its outer wall is provided with scale lines 85, converting the displacement of the third piston 83 into a visible scale indication for the operator to directly read the sealing pressure status. The second spring 86 is sleeved on the outer wall of the scale rod 84. One end of the second spring 86 is engaged with the outer wall of the third piston 83, and the other end of the second spring 86 is engaged with the inner wall of the pressure piston cylinder 82. The second spring 86 is a rotary spring, which undergoes elastic deformation after being compressed or stretched by external force. After the external force is removed, the system returns to its initial state. The second spring 86 provides a reset force to the third piston 83 in the opposite direction to the gas pressure. When the gas pressure in the sealing pipeline and the force of the second spring 86 reach force balance, the third piston 83 stops at the corresponding position. The scale rod 84 indicates the current sealing pressure status. There are four scale rings 87, which are equidistantly arranged on the front side of the insulation door 3 along the circumference. The four scale rings 87 are slidably and appropriately matched to the outer wall of the four scale rods 84. The scale rings 87 serve as the reference for the scale line 85, and their fixed positions indicate the normal range of sealing pressure. By observing the relative positions of the scale line 85 and the scale rings 87, the operator can intuitively determine whether the sealing pressure on the four sides of the inflatable sealing gasket 6 is within the normal range, thus achieving simple and reliable purely mechanical sealing status monitoring.

[0031] Specifically, when the drive disc 713 rotates, the drive groove 714 pushes the drive column 722 to slide radially outward or inward along the limiting slide groove 712. The drive column 722 drives the drive rod 721 to move radially. The drive rod 721 drives the first piston 725 to slide in the inflation piston cylinder 726 through the air replenishment unit 723 and the piston rod 724, so as to realize the inflation or deflation of the inflatable sealing gasket 6.

[0032] Specifically, when the gas pressure inside the inflatable sealing gasket 6 drops due to the cold air inside the cold storage, the second piston 7234 slides outward along the inner cavity of the pressure cylinder 7231 under the action of pressure difference. The second piston 7234 pushes the first piston 725 outward along the inner cavity of the inflatable piston cylinder 726 through the piston rod 724. The first piston 725 replenishes the atmospheric pressure nitrogen outside the inner cavity of the inflatable piston cylinder 726 into the inflatable sealing gasket 6 through the first gas pipe 727, thereby achieving automatic compensation of sealing pressure.

[0033] Step 1: When using this invention, the operator closes the insulated door 3 axially around the hinge, so that the insulated door 3 fits against the door frame 1. At this time, the inflatable sealing gasket 6 is in a contracted state without inflation and is stored in the storage groove 5 on the outer wall of the insulated door 3. It is directly opposite to the labyrinth-type sealing groove 2 on the inner wall of the door frame 1 but does not contact it. There is no resistance during the closing process. After the door is closed, the insulated door 3 is locked by the locking mechanism set on the insulated door 3 and the door frame 1, thereby preventing the insulated door 3 from being opened in a non-human state. Step 2: The operator rotates the handwheel 737 located counterclockwise on the front side of the insulation door 3. The handwheel 737 drives the ratchet 732 and the drive disc 713 to rotate synchronously via the rotating rod 731. Since the ratchet 732 rotates counterclockwise, the pawl 734 will not obstruct the ratchet 732 from rotating counterclockwise with the rotating rod 731. The rotation of the drive disc 713 will drive the four arc-shaped drive grooves 714 on its front side to rotate together with the drive disc 713. When the drive grooves 714 rotate counterclockwise, their arc-shaped contours exert a pushing force on the drive post 722 inserted into them. Since the drive post 722 is also inserted into the limiting slide groove 712 on the rear side of the mounting base 711, the limiting... The slide groove 712 is a radial straight groove. Therefore, under the combined action of the arc-shaped surface of the drive groove 714 and the linear constraint of the limiting slide groove 712, the drive column 722 can only slide outward along the radial direction of the limiting slide groove 712. When the drive column 722 moves outward, it drives the drive rod 721, which is fixedly connected to it, to slide outward along the radial direction of the mounting base 711. The outer end of the drive rod 721 pushes the air replenishment unit 723 to move outward as a whole. The sliders 7232 on both sides of the air replenishment unit 723 slide outward in the slide groove 4 inside the cavity of the heat preservation door 3, providing radial guidance for the air replenishment unit 723. Since the inner cavity of the pressure cylinder 7231 is filled with high-pressure nitrogen, the air replenishment unit 723 moves outward. During movement, the piston rod 724 pushes the first piston 725 to slide outward within the cavity of the inflatable piston cylinder 726. The first piston 725, sliding outward within the inflatable piston cylinder 726, compresses the atmospheric pressure nitrogen gas pre-filled on the outer side of the cavity. The compressed nitrogen gas is discharged through the first air pipe 727 located at the outer end of the inflatable piston cylinder 726. The four first air pipes 727 respectively deliver nitrogen gas to the four sides of the inflatable sealing gasket 6. After receiving the nitrogen gas, the inflatable sealing gasket 6 expands, bulging out of the receiving groove 5 and filling the labyrinthine sealing groove 2 on the inner wall of the door frame 1. The expanded inflatable sealing gasket 6 tightly adheres to the tortuous wall surface of the labyrinthine sealing groove 2, forming a labyrinthine... The sealing structure blocks the gas exchange channel between the inside and outside of the cold storage. As the first piston 725 gradually slides outward along the inner cavity of the inflatable piston cylinder 726, the pressure in the inner cavity of the inflatable sealing gasket 6 will gradually increase. When the pressure in the inner cavity of the inflatable sealing gasket 6 increases to a level greater than the pressure inside the inner cavity of the pressure cylinder 7231, the drive rod 721 continues to drive the pressure cylinder 7231 to move outward. Under the action of air pressure, the second piston 7234 will move inward along the inner cavity of the pressure cylinder 7231. At this time, the positions of the second piston 7234, piston rod 724 and first piston 725 do not change until the inner cavity of the inflatable sealing gasket 6 is filled to a suitable pressure. Step 3: After the handwheel 737 is rotated to the position, the ratchet 732 fixed on the rotating rod 731 rotates to the corresponding angle. Under the elastic force of the first spring 736, the pawl 734 engages in the tooth groove of the ratchet 732, preventing the ratchet 732 from rotating in the opposite direction. After the ratchet 732 is locked, the rotating rod 731 and the drive disc 713 cannot rotate. The positions of the drive rod 721 and the first piston 725 are fixed. The inflatable sealing gasket 6 continues to maintain an expanded sealing state. At the same time, after the expanded inflatable sealing gasket 6 is embedded in the labyrinth sealing groove 2, it generates mechanical resistance that prevents the heat preservation door 3 from being directly pulled open, thus playing an auxiliary self-locking role. Step 4: When the nitrogen in the inflatable sealing gasket 6 contracts due to contact with the low temperature environment inside the cold storage, causing a drop in sealing pressure, the gas pressure inside the inflatable sealing gasket 6 is lower than the pressure of the high-pressure nitrogen filling the inner cavity of the pressure cylinder 7231. This pressure difference pushes the second piston 7234 to slide outward along the inner cavity of the pressure cylinder 7231. When the second piston 7234 moves outward, it pushes the first piston 725 to continue moving outward in the inflatable piston cylinder 726 through the piston rod 724 connected to it. This replenishes the nitrogen outside the inner cavity of the inflatable piston cylinder 726 into the inflatable sealing gasket 6 through the first gas pipe 727. When the pressure inside the inflatable sealing gasket 6 returns to equilibrium with the high-pressure nitrogen pressure in the pressure cylinder 7231, the second piston 7234 stops moving, and the gas replenishment ends automatically. This automatic gas replenishment process is driven entirely by the pressure difference between the pressure cylinder 7231 and the inflatable sealing gasket 6, without the need for manual intervention. Step 5: The gas pressure at the air nozzle 7233 in the air replenishment unit 723 is transmitted to the inner cavity of the pressure piston cylinder 82 on the front side of the insulation door 3 through the second air pipe 81. This pressure pushes the third piston 83 to slide outward inside the pressure piston cylinder 82. The third piston 83 overcomes the elastic force of the second spring 86 and pushes the scale rod 84 outward. The operator can visually judge whether the sealing pressure in the inflatable sealing gasket 6 is within the normal range by observing the relative position of the scale line 85 and the scale ring 87 on the scale rod 84. When the sealing pressure is normal, a specific area of ​​the scale line 85 is aligned with the scale ring 87. After the door is closed and the inflation is completed, if the pressure cylinder 7231... If the pressure inside the cavity does not rise, the pressure inside the pressure piston cylinder 82 will not rise either. At this time, the position of the scale rod 84 will not change. It can be determined that there is a leak between the inflatable sealing gasket 6 and the pressure cylinder 7231. When the pressure inside the pressure cylinder 7231 drops under normal conditions or after the valve is closed and inflation is completed, the pressure inside the pressure piston cylinder 82 will drop. The third piston 83 will retract under the restoring force of the second spring 86, the scale rod 84 will retract, and the position of the scale line 85 will change. At this time, it can be determined that there is a leak between the pressure cylinder 7231 and the pressure piston cylinder 82, prompting the operator to perform maintenance. Step Six: When the door needs to be opened, the operator first releases the pawl 734 to unlock the ratchet 732, and then rotates the handwheel 737 clockwise. The handwheel 737 drives the drive disc 713 to rotate clockwise via the rotating rod 731. The drive groove 714 on the drive disc 713 rotates clockwise, and its arc-shaped contour surface pulls the drive column 722 radially inward along the limiting slide groove 712. The drive column 722 drives the drive rod 721 to slide radially inward. The drive rod 721 pulls the first piston 725 inward within the inflation piston cylinder 726 via the air replenishment unit 723 and the piston rod 724. When the first piston 725 slides inward, the nitrogen in the inflation sealing gasket 6 is drawn back into the inflation piston cylinder 726 through the first air pipe 727. After the inflation sealing gasket 6 deflates, it collapses and retracts into the storage groove 5, disengaging from the labyrinth sealing groove 2. The heat preservation door 3 regains its freedom, and the operator can easily open the heat preservation door 3.

[0034] This device fundamentally blocks cold air leakage to eliminate the conditions for frost formation on the sealing surface. It uses pneumatic pressure instead of rubber elasticity to achieve lifelong self-compensation of sealing pressure. The interlocking of the inflatable sealing gasket and the labyrinth sealing groove provides auxiliary self-locking and vibration damping effects. It uses pressure difference drive to achieve automatic air replenishment compensation of sealing pressure and provides a purely mechanical means of visual monitoring of sealing status. It comprehensively solves the prominent problems of frost formation on the sealing surface of existing ship cold storage insulated doors, aging and failure of sealing strips, wear when closing the door, and lack of coordination in sealing and locking under vibration conditions.

[0035] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-sealing, anti-frost self-locking insulated door for marine cold storage, characterized in that, include: Door frame (1), the inner wall of the door frame (1) is provided with a labyrinth-type sealing groove (2) along the circumferential direction. The heat-insulating door (3) is rotatably installed in the inner cavity of the door frame (1) via a hinge. Four sliding grooves (4) are equidistantly provided on both the front and rear sides of the inner cavity of the heat-insulating door (3). A storage groove (5) is provided on the outer wall of the heat-insulating door (3) along the circumference. The position of the storage groove (5) corresponds to the position of the labyrinth-type sealing groove (2). Sealing strips are provided on both the front and rear sides of the outer wall of the heat-insulating door (3). An inflatable sealing gasket (6) is disposed in the inner cavity of the receiving groove (5); An inflation mechanism (7) is provided in the inner cavity of the heat preservation door (3); A leak detection mechanism (8) is provided on the front side of the heat preservation door (3); The inflation mechanism (7) includes: A drive assembly (71) is disposed on the rear side of the inner cavity of the heat-insulating door (3); An execution component (72) is disposed within the cavity of the drive component (71); Braking assembly (73) is disposed on the front side of drive assembly (71). Braking assembly (73) is used to drive drive assembly (71) to rotate and to fix drive assembly (71).

2. The high-sealing, anti-frost, self-locking insulated door for ship cold storage according to claim 1, characterized in that, The driving component (71) includes: Mounting seat (711), the mounting seat (711) is located in the middle of the rear side of the inner cavity of the heat preservation door (3), and four limiting grooves (712) are provided equidistantly along the circumferential direction on the rear side of the inner cavity of the mounting seat (711). The drive disk (713) is rotatably disposed on the front side of the inner cavity of the mounting base (711) via a bearing. The front side of the drive disk (713) has four drive grooves (714) equidistantly spaced along the circumference. The four drive grooves (714) correspond one-to-one with the four limiting slide grooves (712).

3. The high-sealing, anti-frost, self-locking insulated door for ship cold storage according to claim 2, characterized in that, The execution component (72) includes: The number of drive rods (721) is four. The four drive rods (721) are respectively equidistantly inserted into the inner cavity of the mounting base (711) along the circumferential direction. The positions of the four drive rods (721) correspond one-to-one with the positions of the four limiting slide grooves (712). The outer ends of the four drive rods (721) can slide out of the outer wall of the mounting base (711). The number of drive columns (722) is eight. The eight drive columns (722) are respectively disposed on the inner ends of the front and rear sides of the four drive rods (721). The eight drive columns (722) are respectively slidably adapted to be inserted into the inner cavity of the limiting slide groove (712) and the drive groove (714) corresponding to their positions. An air supply unit (723) is disposed at the outer end of the drive rod (721); Piston rod (724), the piston rod (724) is disposed at the outer end of the air supply unit (723); The first piston (725) is disposed at the outer end of the piston rod (724); The number of the four inflatable piston cylinders (726) is four. The four inflatable piston cylinders (726) are respectively arranged equidistantly in the circumferential direction on the rear side of the inner cavity of the heat preservation door (3). The four first pistons (725) are respectively slidably adapted to be inserted into the inner side of the inner cavity of the four inflatable piston cylinders (726). The first air tube (727) has one end located at the outer end of the inflatable piston cylinder (726), and the inner cavity of the first air tube (727) is connected to the inner cavity of the inflatable piston cylinder (726). The other ends of the four first air tubes (727) are respectively located on the four sides of the inflatable sealing gasket (6).

4. The high-sealing, anti-frost, self-locking insulated door for ship cold storage according to claim 3, characterized in that, The inner cavity of the gas-filled piston cylinder (726) is filled with atmospheric pressure nitrogen gas on the outer side.

5. A high-sealing, anti-frost, self-locking insulated door for ship cold storage according to claim 4, characterized in that, The gas replenishment unit (723) includes: Pressure cylinder (7231), the pressure cylinder (7231) is disposed at the outer end of the drive rod (721); The slider (7232) has eight sliders (7232), which are respectively arranged on the front and rear sides of the four pressure cylinders (7231). The eight sliders (7232) are respectively slidably and compatiblely inserted into the inner cavity of the eight slide grooves (4). An air nozzle (7233) is disposed inside the pressure cylinder (7231), and the inner cavity of the air nozzle (7233) is connected to the inner cavity of the pressure cylinder (7231). The second piston (7234) is slidably fitted into the outer side of the inner cavity of the pressure cylinder (7231). The inner end of the piston rod (724) is located in the middle of the outer side of the second piston (7234), and the outer end of the piston rod (724) extends slidably out of the outer side of the pressure cylinder (7231).

6. A high-sealing, anti-frost, self-locking insulated door for ship cold storage according to claim 5, characterized in that, The inner cavity of the pressure cylinder (7231) is filled with high-pressure nitrogen.

7. A high-sealing, anti-frost, self-locking insulated door for ship cold storage according to claim 6, characterized in that, The leak detection mechanism (8) includes: The second air tube (81) has one end located on the outer wall of the air nozzle (7233), the inner cavity of the second air tube (81) is connected to the inner cavity of the air nozzle (7233), and the other end of the second air tube (81) extends out of the front side of the heat preservation door (3). The pressure piston cylinder (82) has four parts. The four pressure piston cylinders (82) are respectively arranged equidistantly along the circumference on the front side of the heat preservation door (3). The other end of the second air pipe (81) is located at the inner end of the pressure piston cylinder (82). The inner cavity of the pressure piston cylinder (82) and the inner cavity of the second air pipe (81) are connected. The third piston (83) is slidably adapted to be inserted into the inner cavity of the pressure piston cylinder (82); A scale rod (84) is located at the middle of the outer side of the third piston (83). The outer end of the scale rod (84) extends slidably out of the inner cavity of the pressure piston cylinder (82). The outer wall of the scale rod (84) is provided with scale lines (85). The second spring (86) is sleeved on the outer wall of the scale rod (84), one end of the second spring (86) is engaged with the outer wall of the third piston (83), and the other end of the second spring (86) is engaged with the inner wall of the pressure piston cylinder (82); The scale rings (87) are four in number. The four scale rings (87) are equidistantly arranged on the front side of the heat preservation door (3) along the circumference. The four scale rings (87) are slidably matched with the outer wall of the four scale rods (84).

8. A high-sealing, anti-frost, self-locking insulated door for ship cold storage according to claim 7, characterized in that, When the drive disc (713) rotates, the drive groove (714) pushes the drive column (722) to slide radially outward or inward along the limiting slide groove (712). The drive column (722) drives the drive rod (721) to move radially. The drive rod (721) drives the first piston (725) to slide in the inflation piston cylinder (726) through the air replenishment unit (723) and the piston rod (724) to realize the inflation or deflation of the inflatable sealing gasket (6).

9. A high-sealing, anti-frost, self-locking insulated door for ship cold storage according to claim 8, characterized in that, When the gas pressure inside the inflatable sealing gasket (6) drops due to the cold air in the cold storage, the second piston (7234) slides outward along the inner cavity of the pressure cylinder (7231) under the action of pressure difference. The second piston (7234) pushes the first piston (725) to move outward along the inner cavity of the inflatable piston cylinder (726) through the piston rod (724). The first piston (725) replenishes the atmospheric pressure nitrogen outside the inner cavity of the inflatable piston cylinder (726) into the inflatable sealing gasket (6) through the first gas pipe (727), thereby realizing automatic compensation of sealing pressure.

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