Leakage-proof door assembly, door box equipment and leakage-proof method of leakage-proof door assembly and door box equipment

Abstract

The invention relates to a leakage-proof door assembly, door box equipment and a leakage-proof method thereof, which can realize the front-back movement of an inner door plate so as to increase the fitting degree between the inner door plate and a sealing ring and effectively prevent water leakage, gas leakage and / or microwave leakage. The leakage-proof door assembly comprises a door body which comprises a door frame used for being connected with a box body frame in a hinged mode, an outer door plate fixedly arranged on the door frame and an inner door plate which is stacked on the rear side of the outer door plate at intervals and movably arranged on the door frame; and the linear driving mechanism is installed on the door frame and is in driving connection with the inner door plate, and the inner door plate is driven by the linear driving mechanism to move back and forth relative to the door frame so as to be close to or away from the outer door plate.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen equipment, and in particular to a leak-proof door assembly and door box equipment and a leak-proof method thereof. Background Art

[0002] With the improvement of people's living standards, door box equipment such as steamers, ovens, steam-bake-in-one machines or steam-bake-micro-in-one machines have become indispensable household appliances in modern kitchens. However, door box equipment is prone to water and air leakage during mass production, which will seriously affect the cooking performance of door box equipment, especially door box equipment with microwave function. Microwave leakage can also cause damage to the human body.

[0003] In order to solve the leakage problem, the existing solutions are mainly to design the corresponding door seal according to product requirements or to perform manual debugging during the assembly process. However, on the one hand, although the continuous updating of door seal products can prevent water leakage, air leakage and / or microwave leakage to a certain extent, the structure of each cooking machine will change, resulting in the door seal products being non-universal, high cost and low utilization rate; on the other hand, the manual debugging solution is also prone to undesirable phenomena such as looseness and leakage. In addition, even if the water leakage, air leakage and / or microwave leakage problems are solved by using new door seal products and / or manual debugging, the door seal products are prone to aging and deformation as the use time increases, so that the gap between the door glass and the door seal continues to increase, and water leakage, air leakage and / or microwave leakage problems will occur again. Summary of the invention

[0004] In view of the problem that existing door box equipment is prone to water leakage, air leakage and / or microwave leakage, the present application provides a leak-proof door assembly and door box equipment and a leak-proof method thereof, which can realize the forward and backward movement of the inner door panel to increase the fit between the inner door panel and the sealing ring, thereby effectively preventing water leakage, air leakage and / or microwave leakage.

[0005] According to one embodiment of the present application, the present invention provides a leak-proof door assembly, comprising:

[0006] The door body comprises a door frame for being hingedly connected to the box frame, an outer door panel fixedly mounted on the door frame, and an inner door panel overlapped at intervals on the rear side of the outer door panel and movably arranged on the door frame; and

[0007] A linear drive mechanism is installed on the door frame and is drivingly connected to the inner door panel. The inner door panel moves forward and backward relative to the door frame under the drive of the linear drive mechanism to approach or move away from the outer door panel.

[0008] In one embodiment of the present application, the linear drive mechanism includes a rotary motor mounted on the door frame, a transmission shaft fixedly connected to the output shaft of the rotary motor, a gear fixed to the transmission shaft, and a rack extending forward from the inner door panel and meshing with the gear.

[0009] In one embodiment of the present application, the rack has a polished rod segment fixedly connected to the inner door panel and a tooth segment extending forward from the polished rod segment and meshing with the gear.

[0010] In one embodiment of the present application, the linear drive mechanism also includes a fixed seat mounted on the door frame, wherein an end of the transmission shaft away from the rotating motor is rotatably connected to the fixed seat, and the gear is located between the rotating motor and the fixed seat.

[0011] In one embodiment of the present application, the door frame includes a frame body fixedly connected to the outer door panel, a pair of hinge fixing sleeves installed on the left and right sides of the frame body, and an annular mounting plate fixed inside the frame body; the annular mounting plate has a central through hole and a rear mounting groove arranged around the central through hole; the rotating motor is installed in the hinge fixing sleeve, the fixing seat is installed at the bottom of the rear mounting groove, the transmission shaft extends from the rotating motor into the rear mounting groove to be rotatably connected to the fixing seat, and the gear and the rack are located in the rear mounting groove to drive the rack to extend backward or retract forward into the rear mounting groove.

[0012] In one embodiment of the present application, the door body further includes a middle door panel installed on the front side of the annular mounting plate and blocking the central through hole, and an elastic member installed on the rear side of the annular mounting plate and located between the middle door panel and the inner door panel, the front end of the elastic member is fixedly connected to the annular mounting plate, and the rear end of the elastic member is fixedly connected to the inner door panel.

[0013] In one embodiment of the present application, the elastic member is a metal plate stacked between the annular mounting plate and the inner door panel; the metal plate includes a hollow plate body fixedly connected to the annular mounting plate and covering the central through hole, and a plurality of support arms extending obliquely backward from the periphery of the hollow plate body and fixedly connected to the inner door panel.

[0014] In one embodiment of the present application, the number of the linear drive mechanisms is two, and the two linear drive mechanisms are symmetrically arranged on the left and right sides of the door frame.

[0015] According to another aspect of the present application, an embodiment of the present application further provides a door box device, including:

[0016] A box assembly, comprising a box frame, an inner liner arranged in the box frame, and a sealing ring arranged in the inner liner and surrounding an opening of the inner liner; and

[0017] Any of the leak-proof door assemblies described above can be rotatably disposed on the box frame to open or block the opening of the inner container.

[0018] In one embodiment of the present application, the door box device further includes a limit sensor arranged on the box frame and used to detect the inner door panel of the leak-proof door assembly, and a controller communicatively connected to the limit sensor and the linear drive mechanism of the leak-proof door assembly.

[0019] According to another aspect of the present application, an embodiment of the present application further provides a method for preventing leakage of a door box device, comprising the steps of:

[0020] When the door box device is in a closed state, the linear drive mechanism of the leakproof door assembly starts to drive the inner door plate to move backward to approach a limit sensor disposed on the box frame of the box assembly; and

[0021] The distance between the inner door panel and the limit sensor is detected by the limit sensor, and when the detected distance is less than or equal to a set threshold, the linear drive mechanism is controlled to stop driving, so that the inner door panel presses against the sealing ring of the box assembly.

[0022] In summary, the inner door panel in the leak-proof door assembly of the present application can move forward and backward relative to the door frame under the drive of the linear drive mechanism. In this way, even if the sealing ring ages or undergoes irreversible deformation with the increase of usage time, the inner door panel can be driven by the linear drive mechanism to further move backward relative to the door frame to fit tightly against the sealing ring, thereby preventing the formation of a gap between the sealing ring and the inner door panel, and can always provide good water leakage prevention, air leakage prevention and / or microwave leakage prevention effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional schematic diagram of a door box device according to an embodiment of the present invention;

[0024] Figure 2 An exploded schematic diagram of a door box device according to the above embodiment of the present invention is shown;

[0025] Figure 3 A schematic structural diagram of a leak-proof door assembly in a door box device according to the above embodiment of the present invention is shown;

[0026] Figure 4 An exploded schematic diagram of a leak-proof door assembly according to the above embodiment of the present invention is shown;

[0027] Figure 5 A longitudinal cross-sectional schematic diagram of a leak-proof door assembly according to the above embodiment of the present invention is shown;

[0028] Figure 6 A schematic transverse cross-sectional view of a leak-proof door assembly according to the above embodiment of the present invention is shown;

[0029] Figure 7 An enlarged schematic diagram of a linear drive mechanism in a leak-proof door assembly according to the above embodiment of the present invention is shown;

[0030] Figure 8 The figure is a flow chart of a method for preventing leakage of a door box device according to an embodiment of the present invention.

[0031] Explanation of the main component symbols: 1. Door box equipment; 10. Leak-proof door assembly; 11. Door body; 111. Door frame; 1111. Frame body; 1112. Hinge fixing sleeve; 1113. Annular mounting plate; 11131. Middle through hole; 11132. Rear mounting groove; 112. Outer door panel; 113. Inner door panel; 114. Middle door panel; 115. Elastic member; 1150. Metal plate; 1151. Hollow plate body; 1152. Support arm; 12. Linear drive mechanism; 121. Rotating motor; 122. Transmission shaft; 123. Gear; 124. Rack; 1241. Bare rod section; 1242. Tooth section; 125. Fixed seat; 13. Handle; 20. Box assembly; 21. Box frame; 22. Inner liner; 23. Sealing ring; 24. Condensate sink; 30. Limit sensor.

[0032] The above description of the main component symbols is combined with the accompanying drawings and specific implementation methods to further illustrate the present invention in detail. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] Considering that even if the existing door box equipment uses new door seal products and / or solves the water leakage, air leakage and / or microwave leakage problems after manual debugging, the door seal products are prone to aging and deformation as the use time increases, so that the gap between the door glass and the door seal continues to increase, and water leakage, air leakage and / or microwave leakage problems will occur again. Therefore, in order to solve the above problems, the present application provides a leak-proof door assembly and door box equipment and a leak-proof method thereof, which can realize the forward and backward movement of the inner door panel to increase the fit between the inner door panel and the sealing ring of the box assembly, and effectively prevent water leakage, air leakage and / or microwave leakage.

[0040] Specifically, Figure 1 and Figure 2 As shown, one embodiment of the present application provides a door box device 1, which may include a leakproof door assembly 10 and a box assembly 20, the box assembly 20 includes a box frame 21, an inner liner 22 disposed in the box frame 21, and a sealing ring 23 disposed in the inner liner 22 and arranged around the opening of the inner liner 22, the leakproof door assembly 10 is rotatably disposed on the box frame 21 to open or block the opening of the inner liner 22. It can be understood that the door box device mentioned in the present application may include, but is not limited to, systems such as a spray system, a heating system, or a blowing system to achieve specific functions, for example, the door box device 1 may be implemented as, but is not limited to, a steamer, an oven, a steam-bake-in-one machine, a steam-bake-in-one machine, or a dishwasher.

[0041] More specifically, if Figures 2 to 7 As shown, the leakproof door assembly 10 may include a door body 11 and a linear drive mechanism 12. The door body 11 includes a door frame 111 for being hingedly connected to the box frame 21, an outer door panel 112 fixed to the door frame 111, and an inner door panel 113 which is overlapped at intervals on the rear side of the outer door panel 112 and movably arranged on the door frame 111. The linear drive mechanism 12 is installed on the door frame 111 and is drivingly connected to the inner door panel 113. The inner door panel 113 moves forward and backward relative to the door frame 111 under the drive of the linear drive mechanism 12 to approach or move away from the outer door panel 112, so as to fit tightly with the sealing ring 23 of the box assembly 20 when the door is closed, so as to prevent problems such as water leakage, air leakage and / or microwave leakage.

[0042] It is worth noting that, in the existing door box equipment, the outer door plate and the inner door plate are fixed to the door frame, and the door frame is in contact with the box frame in the closed state, and the inner door plate is in contact with the sealing ring on the inner liner to block the opening of the inner liner; therefore, after long-term use, as the sealing ring ages or undergoes irreversible deformation, a large gap is easily formed between the inner door plate and the sealing ring, and water leakage, air leakage and / or microwave leakage will occur again. The inner door plate 113 in the leak-proof door assembly 10 of the present application can move forward and backward relative to the door frame 111 under the drive of the linear drive mechanism 12, so that even if the sealing ring 23 ages or undergoes irreversible deformation with the increase of the use time, the inner door plate 113 can be driven by the linear drive mechanism 12 to further move backward relative to the door frame 111 to fit tightly with the sealing ring 23, so as to prevent the formation of a gap between the sealing ring 23 and the inner door plate 113, and can always play a good role in preventing water leakage, air leakage and / or microwave leakage.

[0043] For example, Figures 5 to 7 As shown, the linear drive mechanism 12 may include a rotating motor 121 mounted on the door frame 111, a transmission shaft 122 fixedly connected to the output shaft of the rotating motor 121, a gear 123 fixed to the transmission shaft 122, and a rack 124 extending forward from the inner door panel 113 and meshing with the gear 123. In this way, when the rotating motor 121 drives the transmission shaft 122 to rotate forward, the gear 123 rotates forward along with the transmission shaft 122 to drive the rack 124 to move the inner door panel 113 backward, so that the inner door panel 113 extends toward the opening direction close to the inner liner 22 so as to fit tightly against the sealing ring 23; similarly, when the rotating motor 121 drives the transmission shaft 122 to rotate reversely, the gear 123 rotates reversely along with the transmission shaft 122 to drive the rack 124 to move forward, so that the inner door panel 113 retracts toward the opening direction away from the inner liner 22 so as to move away from the sealing ring 23, so as to match the height difference between the box frame and the inner liner opening in different door box devices.

[0044] Alternatively, if Figure 5 and Figure 7As shown, the rack 124 has a polished rod section 1241 fixedly connected to the inner door panel 113 and a tooth section 1242 extending forward from the polished rod section 1241 and meshing with the gear 123. In this way, when the rotary motor 121 drives the transmission shaft 122 to rotate in the opposite direction, the gear 123 rotates in the opposite direction with the transmission shaft 122 to drive the rack 124 to move forward with the inner door panel 113, so that the inner door panel 113 retracts toward the opening direction away from the inner liner 22; at the same time, when the rack 124 moves further forward to make the gear 123 move from the tooth section 1242 to the polished rod section 1241, the gear 123 is disengaged from the rack 124, so as to prevent the inner door panel 113 from being driven further forward and prevent the inner door panel 113 from being damaged due to excessive forward movement.

[0045] Alternatively, if Figures 5 to 7 As shown, the linear drive mechanism 12 also includes a fixed seat 125 installed on the door frame 111, wherein the end of the transmission shaft 122 away from the rotating motor 121 is rotatably connected to the fixed seat 125, and the gear 123 is located between the rotating motor 121 and the fixed seat 125, so as to better support the gear 123 and improve the overall stability of the linear drive mechanism 12.

[0046] It is worth noting that in other examples of the present application, the linear drive mechanism 12 can also be implemented as a linear motor, an electric push rod, a hydraulic rod or a cylinder, as long as it can drive the inner door panel 113 to move backward to fit closely against the sealing ring 23. This application will not go into details.

[0047] In addition, in the above-mentioned embodiment of the present application, the number of the linear drive mechanism 12 can be one or more. Figure 3 and Figure 6 As shown, two linear drive mechanisms 12 are symmetrically arranged on the left and right sides of the door frame 111 so as to symmetrically apply thrust or pull to the inner door panel 113, which helps to ensure that the inner door panel 113 can be evenly close to the sealing ring 23 to achieve a better sealing effect.

[0048] According to the above embodiments of the present application, Figures 4 to 6As shown, the door frame 111 in the leak-proof door assembly 10 may include a frame body 1111 fixedly connected to the outer door panel 112, a pair of hinge fixing sleeves 1112 installed on the left and right sides of the frame body 1111, and an annular mounting plate 1113 fixed inside the frame body 1111; the annular mounting plate 1113 has a central through hole 11131 and a rear mounting groove 11132 arranged around the central through hole 11131. The rotating motor 121 is installed on the hinge fixing sleeve 1112, and the fixing seat 125 is installed at the bottom of the rearward mounting groove 11132. The transmission shaft 122 extends from the rotating motor 121 into the rearward mounting groove 11132 to be rotatably connected to the fixing seat 125; the gear 123 and the rack 124 are located in the rearward mounting groove 11132 to drive the rack 124 to extend backward or retract forward into the rearward mounting groove 11132, so as to provide sufficient installation space and improve the structural compactness of the door assembly.

[0049] Alternatively, if Figures 4 to 6 As shown, the door body 11 further includes a middle door plate 114 installed on the front side of the annular mounting plate 1113 and blocking the middle through hole 11131, so as to form an air barrier between the outer door plate 112 and the middle door plate 114, so as to increase the heat preservation effect of the door body 11. It can be understood that the outer door plate 112, the inner door plate 113 and the middle door plate 114 mentioned in the present application can all be implemented as door glass, so that the user can see the cooking status inside the inner pot 22 through the door body 11.

[0050] Alternatively, if Figures 4 to 6 As shown, the door body 11 further includes an elastic member 115 installed on the rear side of the annular mounting plate 1113 and located between the middle door plate 114 and the inner door plate 113, the front end of the elastic member 115 is fixedly connected to the annular mounting plate 1113, and the rear end of the elastic member 115 is fixedly connected to the inner door plate 113, so that the inner door plate 113 can be movably installed on the rear side of the annular mounting plate 1113, ensuring that the inner door plate 113 can be driven by the linear drive mechanism 12 to move forward and backward relative to the outer door plate 112. It can be understood that in other examples of the present application, the door body 11 may not be additionally provided with the elastic member 115, but the inner door plate 113 is directly fixedly installed on the annular mounting plate 1113, so as to utilize the deformation ability of the annular mounting plate 1113 itself to ensure that the inner door plate 113 can be driven by the linear drive mechanism 12 to move forward and backward relative to the outer door plate 112.

[0051] Alternatively, if Figures 4 to 6As shown, the elastic member 115 is implemented as a metal plate 1150, which is stacked between the annular mounting plate 1113 and the inner door plate 113 to provide an elastic space while covering the opening of the inner tank 22 in the closed state, thereby achieving an electromagnetic shielding effect and preventing microwave leakage.

[0052] Alternatively, if Figure 5 and Figure 6 As shown, the metal plate 1150 includes a hollow plate body 1151 fixedly connected to the annular mounting plate 1113 and covering the central through hole 11131, and a plurality of support arms 1152 extending obliquely backward from the periphery of the hollow plate body 1151 and fixedly connected to the inner door panel 113, so that while utilizing the hollow plate body 1151 to provide a better electromagnetic shielding effect, the plurality of obliquely extending support arms 1152 can be used to stably support the inner door panel 113 and provide sufficient movement space for the inner door panel 113.

[0053] Alternatively, if Figures 2 to 6 As shown, the leak-proof door assembly 10 further includes a handle 13 protruding from the outer door plate 112 so that a user can hold the handle 13 to open or close the door.

[0054] It is worth noting that for different types of door box equipment, the installation depth of the liner in the box frame often varies greatly, that is, the height difference between the opening of the liner and the box frame varies greatly, and the same door seal (such as sealing ring) cannot meet the needs of different types of door box equipment. In order to solve this problem, Figure 2 As shown, the door box device 1 of the present application may further include a limit sensor 30 disposed on the box frame 21 and used to detect the inner door panel 113, and a controller (not shown in the figure) communicatively connected to the limit sensor 30 and the linear drive mechanism 12. In this way, when the door box device 1 is in a closed state, the controller controls the linear drive mechanism 12 to start driving the inner door panel 113 to move backward to approach the limit sensor 30; when the limit sensor 30 detects that the distance between the inner door panel 113 and the limit sensor 30 is less than or equal to a set threshold, the controller controls the linear drive mechanism 12 to stop driving, so that the inner door panel 113 presses against the sealing ring 23 of the box assembly 20 to fit tightly, thereby preventing air leakage, water leakage and / or microwave leakage.

[0055] It can be understood that the set threshold mentioned in the present application can be pre-set based on different types of door box equipment, such as by performing threshold detection on the inner door panels and sealing rings of all door box equipment products, and selecting the minimum value as the set threshold, so as to obtain a universal value for all products, which is applicable to all product series.

[0056] Optionally, the set threshold is equal to the recognition distance of the limit sensor 30, so that when the limit sensor 30 recognizes the inner door panel 113, it is ensured that the distance between the inner door panel 113 and the limit sensor 30 is less than or equal to the set threshold. At this time, the limit sensor 30 sends an identification signal to the controller, so that the controller sends a control signal to the linear drive mechanism 12 to control the rotating motor 121 of the linear drive mechanism 12 to stop rotating.

[0057] Optionally, the automatic recognition distance of the limit sensor 30 is implemented as 0.5 mm, that is, the set threshold value can be implemented as 0.5 mm.

[0058] Alternatively, if Figure 2 As shown, the limit sensor 30 is installed in the hinge groove on the box frame 21 to prevent the limit sensor 30 from protruding from the box frame 21 and interfering with the closing of the door, ensuring that when the limit sensor 30 identifies the inner door panel 113, the distance between the inner door panel 113 and the sealing ring 23 is further compressed to fit tightly.

[0059] According to the above embodiments of the present application, Figure 2 As shown, the box assembly 20 further includes a condensation water tank 24 disposed at the lower part of the box frame 21. The condensation water tank 24 is located below the door body 11 when the door is closed to collect condensation water flowing down through the door body 11. In this way, the user can judge whether there is air leakage or water leakage by observing the water drop phenomenon of the condensation water tank 24 and the middle door plate 114.

[0060] It is worth mentioning that according to another aspect of the present application, Figure 8 As shown, an embodiment of the present application further provides a method for preventing leakage of a door box device, which may include the steps of:

[0061] S100: when the door box device is in a closed state, the linear drive mechanism of the leakproof door assembly is controlled to start driving the inner door panel to move backward to approach a limit sensor disposed on a box frame of the box assembly; and

[0062] S200: Detect the distance between the inner door panel and the limit sensor through the limit sensor, and when the detected distance is less than or equal to a set threshold, control the linear drive mechanism to stop driving, so that the inner door panel presses against the sealing ring of the box assembly.

[0063] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A leak-proof door assembly, characterized in that: include: The door body comprises a door frame for being hingedly connected to the box frame, an outer door panel fixedly mounted on the door frame, and an inner door panel overlapped at intervals on the rear side of the outer door panel and movably arranged on the door frame; and A linear drive mechanism is installed on the door frame and is drivingly connected to the inner door panel. The inner door panel moves forward and backward relative to the door frame under the drive of the linear drive mechanism to approach or move away from the outer door panel.

2. The leak-proof door assembly according to claim 1, characterized in that: The linear drive mechanism includes a rotary motor mounted on the door frame, a transmission shaft fixedly connected to the output shaft of the rotary motor, a gear fixed to the transmission shaft, and a rack extending forward from the inner door panel and meshing with the gear.

3. The leak-proof door assembly according to claim 2, characterized in that: The rack comprises a polished rod section fixedly connected to the inner door panel and a tooth section extending forward from the polished rod section and meshing with the gear.

4. The leakproof door assembly according to claim 2 or 3, characterized in that: The linear drive mechanism further comprises a fixing seat mounted on the door frame, wherein an end of the transmission shaft away from the rotating motor is rotatably connected to the fixing seat, and the gear is located between the rotating motor and the fixing seat.

5. The leak-proof door assembly according to claim 4, characterized in that: The door frame includes a frame body fixedly connected to the outer door panel, a pair of hinge fixing sleeves installed on the left and right sides of the frame body, and an annular mounting plate fixed inside the frame body; the annular mounting plate has a central through hole and a rearward mounting groove arranged around the central through hole; the rotating motor is installed in the hinge fixing sleeve, the fixing seat is installed at the bottom of the rearward mounting groove, the transmission shaft extends from the rotating motor into the rearward mounting groove to be rotatably connected to the fixing seat, and the gear and the rack are located in the rearward mounting groove to drive the rack to extend backward or retract forward into the rearward mounting groove.

6. The leak-proof door assembly according to claim 5, characterized in that: The door body further includes a middle door plate installed on the front side of the annular mounting plate and blocking the central through hole, and an elastic member installed on the rear side of the annular mounting plate and located between the middle door plate and the inner door plate, the front end of the elastic member is fixedly connected to the annular mounting plate, and the rear end of the elastic member is fixedly connected to the inner door plate.

7. The leakproof door assembly according to claim 6, characterized in that: The elastic member is a metal plate stacked between the annular mounting plate and the inner door panel; the metal plate includes a hollow plate body fixedly connected to the annular mounting plate and covering the central through hole, and a plurality of support arms extending obliquely backward from the periphery of the hollow plate body and fixedly connected to the inner door panel.

8. The leakproof door assembly according to any one of claims 1 to 3, characterized in that: The number of the linear drive mechanisms is two, and the two linear drive mechanisms are symmetrically arranged on the left and right sides of the door frame.

9. Door box equipment, characterized in that, include: A box assembly, comprising a box frame, an inner liner arranged in the box frame, and a sealing ring arranged in the inner liner and surrounding an opening of the inner liner; and The leak-proof door assembly as described in any one of claims 1 to 8 is rotatably arranged on the box frame to open or block the opening of the inner container.

10. The door box device according to claim 9, characterized in that: The door box device further includes a limit sensor disposed on the box frame and used to detect the inner door plate of the leak-proof door assembly, and a controller communicatively connected to the limit sensor and the linear drive mechanism of the leak-proof door assembly.

11. A method for preventing leakage of door box equipment, characterized in that: Includes steps: When the door box device is in a closed state, the linear drive mechanism of the leakproof door assembly starts to drive the inner door plate to move backward to approach a limit sensor disposed on the box frame of the box assembly; and The distance between the inner door panel and the limit sensor is detected by the limit sensor, and when the detected distance is less than or equal to a set threshold, the linear drive mechanism is controlled to stop driving, so that the inner door panel presses against the sealing ring of the box assembly.

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