Marine composite air pipe

Abstract

The utility model discloses a marine composite air duct in the technical field of composite air ducts, which comprises an outer air duct and a framework, the framework is spirally arranged and used for supporting the outer air duct, the framework comprises a bottom edge and two folded edges, a sliding cavity is formed between the bottom edge and the two folded edges, a sliding groove is formed between the end parts of the two folded edges, the framework is slidably connected with a locking component, and the locking component is connected with the outer air duct. The locking assembly comprises a lower plate body slidably connected into the sliding cavity, part of the outer air pipe is located between the lower plate body and the inner wall of the sliding cavity, and the lower plate body is in clearance fit with part of the outer air pipe. A fixing mechanism is arranged in the locking assembly and comprises a first fixing plate slidably connected into the lifting groove, two driving blocks are symmetrically arranged on the bottom face of the first fixing plate, translation blocks are slidably connected into the two translation cavities, the translation blocks are slidably connected with the driving blocks, and the translation blocks extend into the translation groove. And a spring is arranged between the side face, away from the second fixing plate, of the translation block and the side wall of the translation cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of composite air ducts, in particular to a composite air duct for ships. Background Art

[0002] The existing Chinese patent application number CN202221560571.7 discloses a composite air duct suitable for ships, which adopts "the skeleton is in an open U-shaped shape on the cross-section, and part of the external air duct is folded into the skeleton. A locking component is slidably provided in the skeleton, and the locking component includes a sliding body and a lifting ring body. The sliding body is partially arranged in the skeleton and protrudes to the outside of the external air duct. The lifting ring body is connected to the sliding body" to achieve the purpose of "meeting the space bending requirements, high acid and alkali resistance requirements, and convenient installation and fixation, and long service life".

[0003] During the implementation of the above technical solution, plate body 1 is connected to the external air duct in a sliding manner. Once the position of the hanging ring body is fixed, the position of plate body 1 is fixed. However, since plate body 1 is connected to the external air duct in a sliding manner, the position of the external air duct cannot be fixed, or the existing technology does not make corresponding treatment for the sliding of the external air duct. Once the external air duct is locally twisted during the sliding process, it will affect the flow of gas inside the external air duct, and may cause the external air duct to rupture due to excessive pressure. Utility Model Content

[0004] The purpose of the present utility model is to provide a composite air duct for a ship to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A marine composite air duct comprises an outer air duct and a frame, the frame being spirally arranged and used to support the outer air duct, the frame comprising a bottom edge and two folded edges, a sliding cavity being formed between the bottom edge and the two folded edges, a sliding groove being formed between the ends of the two folded edges, the sliding cavity and the sliding groove being vertically connected, the frame being slidably connected to a locking assembly, the locking assembly comprising a lower plate body slidably connected within the sliding cavity, a portion of the outer air duct being located between the lower plate body and the inner wall of the sliding cavity, the lower plate body being clearance-matched with a portion of the outer air duct;

[0007] The locking assembly is provided with a fixing mechanism, the upper surface of the lower plate body is vertically provided with a lifting slot, and the bottom end of the lifting slot is symmetrically and vertically provided with two first lifting cavities, and the two side surfaces of the lower plate body are symmetrically and horizontally provided with two translation slots, and the two translation cavities are symmetrically and horizontally provided in the two translation slots, and the two translation cavities are vertically connected to the two first lifting cavities. The fixing mechanism includes a first fixing plate slidably connected in the lifting slot, and two driving blocks are symmetrically provided on the bottom surface of the first fixing plate, and translation blocks are slidably connected in the two translation cavities, and the translation block is slidably connected to the driving block, and the translation block extends into the translation slot, and the end is fixedly connected to a second fixing plate slidably connected to the translation slot, and a spring is provided between the side of the translation block away from the second fixing plate and the side wall of the translation cavity.

[0008] As a further solution of the present invention: the driving block is vertically arranged on the bottom surface of the first fixed plate, the side of the first fixed plate away from the first fixed plate is provided with an inclined surface, and the surface of the translation block close to the driving block is provided with an inclined cavity that is slidingly connected to the inclined surface of the driving block. The driving block moves vertically downward, driving the translation block to move toward the direction of the spring.

[0009] As a further solution of the present invention: the size of the first fixed plate is the same as that of the lifting slot, the size of the second fixed plate is the same as that of the translation slot, when the second fixed plate is completely placed in the translation slot, the first fixed plate is completely placed in the lifting slot, and when the second fixed plate partially extends out of the translation slot, the first fixed plate partially extends out of the lifting slot.

[0010] As a further solution of the present invention: the locking assembly also includes a connecting block fixedly installed on the bottom surface of the lifting groove, the connecting block is inserted in the first fixed plate and is slidingly connected to the first fixed plate, the connecting block is located in the sliding groove, and part of the external air duct is located between the outer wall of the connecting block and the side wall of the sliding groove.

[0011] As a further solution of the present invention: two third lifting cavities are symmetrically and vertically opened in the connecting block, two second lifting cavities are symmetrically and horizontally opened at the bottom ends of both sides of the connecting block, the third lifting cavity is vertically connected to the second lifting cavity, and two connecting lifting blocks are vertically slidably connected in the two second lifting cavities, the connecting lifting block is fixedly connected to the first fixed plate, the height of the connecting lifting block is smaller than the second lifting cavity, and the upper surface of the connecting lifting block is fixedly connected to a lifting rod that vertically lifts and lowers along the third lifting cavity.

[0012] As a further scheme of the utility model: the end part of the connecting block away from the lower plate body is fixedly connected with the upper plate body, two fourth lifting cavities vertically arranged are formed in the upper plate body, the lifting rod passes through the fourth lifting cavity and lifts along the fourth lifting cavity, the upper plate body and the lower plate body are parallel to each other and all have an arc, the arc is matched with the framework, the upper plate body is above two folding edges, and part of the outer air pipe is between the upper plate body and the two folding edges.

[0013] As a further scheme of the utility model: the upper surface of the upper plate body is provided with a supporting block, the upper surface of the supporting block is provided with a lifting ring, a through hole for the locking piece to pass through is arranged on the lifting ring, a pressing cavity is formed below the through hole, and a pressing block is slidably connected in the pressing cavity.

[0014] As a further scheme of the utility model: two fifth lifting cavities are vertically formed in the supporting block, two sixth lifting cavities are vertically formed in the lifting ring, the two sixth lifting cavities are communicated with the pressing cavity, the lifting rod sequentially passes through the fifth lifting cavity and the sixth lifting cavity and extends into the pressing cavity, and the two lifting rods are fixedly connected with the bottom surface of the pressing block.

[0015] As a further scheme of the utility model: when the first fixed plate is completely placed in the lifting groove, the pressing block is located at the bottom of the pressing cavity, and when the first fixed plate is maximally extended out of the lifting groove, the pressing block does not extend out of the pressing cavity.

[0016] As a further scheme of the utility model: the framework is in the shape of an open mouth on the cross section, part of the outer air pipe is arranged in the framework, and the outer air pipe comprises an aluminum foil layer and a glass fiber cloth layer arranged in close contact.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] In the utility model, when the first fixed plate is completely placed in the lifting groove, the first fixed plate does not affect the sliding of the lower plate body relative to the outer air pipe, and when the first fixed plate is extended out of the lifting groove, the outer air pipe is pressed in the direction of the framework, the first fixed plate does not slide with the lower plate body due to the pressure, the relative static state of the lower plate body and the outer air pipe is realized, and the lower plate body does not slide relative to the outer air pipe.

[0019] In the utility model, when the second fixed plate is extended out of the translation groove, the outer air pipe is pressed in the direction of the framework, the second fixed plate does not slide with the lower plate body due to the pressure, the relative static state of the lower plate body and the outer air pipe is realized, and the lower plate body does not slide relative to the outer air pipe.

[0020] When the spring in the utility model pushes the translation block to slide in the opposite direction, the driving block moves vertically upward, and the driving block drives the first fixed plate to extend out of the lifting slot to squeeze the external air duct. At the same time, the translation block drives the second fixed plate to extend out of the translation slot to squeeze the external air duct. The first fixed plate and the second fixed plate cooperate with each other to jointly squeeze the external air duct toward the skeleton, so as to achieve relative stillness of the lower plate body and the external air duct, and the lower plate body will not slide relative to the external air duct. Once the position of the hanging ring is fixed and the position of the lower plate body is fixed, the external air duct will not slide relative to the locking assembly, the external air duct will not be locally twisted, and the flow of gas inside the external air duct will not be affected, and it is even more impossible to cause the external air duct to rupture. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the locking assembly in the present utility model;

[0023] Figure 3 It is a cross-sectional view of the frame combined with the locking assembly in the present invention;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0026] Figure 6 for Figure 3 Enlarged view of point C in the middle.

[0027] In the figure: 1. External air duct; 2. Skeleton; 21. Bottom edge; 22. Folding edge; 23. Sliding cavity; 24. Sliding groove; 3. Locking assembly; 31. Lower plate; 311. Lifting groove; 312. First lifting cavity; 313. Translation cavity; 314. Translation groove; 32. Connecting block; 321. Second lifting cavity; 322. Third lifting cavity; 33. Upper plate; 331. Fourth lifting cavity; 34. Support block; 341. Fifth lifting cavity; 35. Lifting ring; 351. Sixth lifting cavity; 352. Pressing cavity; 4. Fixing mechanism; 41. First fixing plate; 42. Driving block; 43. Translation block; 44. Oblique cavity; 45. Second fixing plate; 46. Spring; 47. Connecting lifting block; 48. Lifting rod; 49. Pressing block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0029] A marine composite air duct, reference Figures 1-6 , including an external air duct 1 and a frame 2, the external air duct 1 includes an aluminum foil layer and a glass fiber cloth layer that are laminated together; the effect achieved by the above components is: the external air duct 1 is composed of an aluminum foil layer and a glass fiber cloth layer that are laminated together, the two are bonded together to form a pipe surface that is fireproof, soft and tough, acid and alkali resistant, high temperature and vibration resistant, and can achieve a long service life.

[0030] like Figures 1-6 As shown, in this embodiment: the skeleton 2 is arranged in a spiral shape and is used to support the external air duct 1. The skeleton 2 is in an open U-shape on the cross-section, and part of the external air duct 1 is folded into the skeleton 2. The skeleton 2 includes a bottom edge 21 and two folded edges 22. A sliding cavity 23 is formed between the bottom edge 21 and the two folded edges 22. A sliding groove 24 is formed between the ends of the two folded edges 22. The sliding cavity 23 and the sliding groove 24 are vertically connected. The external air duct 1 is bonded and fixed to the inner walls of the sliding cavity 23 and the sliding groove 24 by glue. The effect achieved by the above components is that a fixed connection between the external air duct 1 and the skeleton 2 can be achieved.

[0031] like Figures 1-6 As shown, in this embodiment: the frame 2 is slidably connected with a locking assembly 3, the locking assembly 3 includes a lower plate body 31 slidably connected in the sliding cavity 23, and a lifting groove 311 is vertically opened on the upper surface of the lower plate body 31, the locking assembly 3 also includes a connecting block 32 fixedly installed on the bottom of the lifting groove 311, the end of the connecting block 32 away from the lower plate body 31 is fixedly connected to the upper plate body 33, the upper surface of the upper plate body 33 is provided with a supporting block 34, and the upper surface of the supporting block 34 is provided with a lifting ring 35, and the lifting ring 35 is provided with a through hole for the locking member to pass through; the effect achieved by the above components is: the lifting ring 35 is fixedly connected to the upper plate body 33 through the supporting block 34, and the upper plate body 33 is fixedly connected to the lower plate body 31 through the connecting block 32; the through hole on the lifting ring 35 is for the locking member to pass through, and the locking member such as a latch, screw, etc. fixes the lifting ring 35 to the corresponding position of the installation space, thereby fixing the external air duct 1 and the frame 2.

[0032] like Figures 1-6When the handle 31 is in the closed position, the handle 31 is in the closed position, and the handle 31 is in the closed position, so that the handle 31 can move freely, and the handle 31 can move freely, and the handle 31 is in the open position, so that the handle 31 can move freely.

[0033] like Figures 1-6 As shown, in this embodiment: the connecting block 32 is located in the sliding groove 24, part of the external air duct 1 is located between the outer wall of the connecting block 32 and the side wall of the sliding groove 24, and the connecting block 32 and the external air duct 1 are clearance-matched; the effect achieved by the above components is: the connecting block 32 and the external air duct 1 are clearance-matched, so that the connecting block 32 can slide smoothly along the sliding groove 24.

[0034] like Figures 1-6 As shown, in this embodiment: a fixing mechanism 4 is provided in the locking assembly 3, and a lifting groove 311 is vertically opened on the upper surface of the lower plate body 31, and the fixing mechanism 4 includes a first fixing plate 41 slidably connected to the lifting groove 311, and the size of the first fixing plate 41 is the same as the lifting groove 311; the effect achieved by the above components is: when the first fixing plate 41 is completely located in the lifting groove 311, the first fixing plate 41 will not affect the sliding of the lower plate body 31 relative to the external air duct 1; after the first fixing plate 41 extends out of the lifting groove 311, it will squeeze the external air duct 1 toward the frame 2. Due to the pressure, the first fixing plate 41 will not slide with the lower plate body 31, and accordingly, the relative stillness of the lower plate body 31 and the external air duct 1 will be achieved, and the lower plate body 31 will not slide relative to the external air duct 1.

[0035] like Figures 1-6 As shown, in this embodiment: two first lifting cavities 312 are symmetrically and vertically opened at the bottom end of the lifting groove 311, and two driving blocks 42 are symmetrically provided on the bottom surface of the first fixed plate 41. The driving blocks 42 are vertically arranged on the bottom surface of the first fixed plate 41, and the two driving blocks 42 are respectively slidably connected in the first lifting cavities 312; the effect achieved by the above components is that during the lifting and lowering process of the two driving blocks 42 along the two first lifting cavities 312, the first fixed plate 41 is driven to lift and lower along the lifting groove 311.

[0036] like Figures 1-6As shown, in this embodiment: two translation grooves 314 are symmetrically and horizontally provided on two side surfaces of the lower plate body 31, and two translation cavities 313 are symmetrically and horizontally provided in the two translation grooves 314. The two translation cavities 313 shown are vertically connected to the two first lifting cavities 312, and a translation block 43 is slidably connected in the two translation cavities 313, and the translation block 43 is slidably connected to the driving block 42. The first fixed plate 41 is provided with an inclined surface on the side away from the first fixed plate 41, and the translation block 43 is provided with an inclined cavity 44 slidably connected to the inclined surface of the driving block 42 on the surface close to the driving block 42; the effect achieved by the above components is: the two translation cavities 313 shown are vertically connected to the two first lifting cavities 312, so that the two driving blocks 42 are respectively positioned perpendicular to the two translation blocks 43; the inclined surface on the driving block 42 is slidably connected to the inclined cavity 44 on the translation block 43, so when the translation block 43 slides along the translation cavity 313, the driving block 42 slides along the first lifting cavity 312.

[0037] like Figures 1-6 As shown, in this embodiment: the translation block 43 extends into the translation slot 314, and the end is fixedly connected to a second fixed plate 45 that is slidably connected to the translation slot 314, and the size of the second fixed plate 45 is the same as the translation slot 314; the effect achieved by the above components is: when the second fixed plate 45 is completely located in the translation slot 314, the second fixed plate 45 will not affect the sliding of the lower plate body 31 relative to the external air duct 1; after the second fixed plate 45 extends out of the translation slot 314, it will squeeze the external air duct 1 toward the skeleton 2. Due to the pressure, the second fixed plate 45 will not slide with the lower plate body 31, and accordingly, the relative stillness of the lower plate body 31 and the external air duct 1 will be achieved, and the lower plate body 31 will not slide relative to the external air duct 1.

[0038] like Figures 1-6 As shown, in this embodiment: a spring 46 is provided between the side of the translation block 43 away from the second fixed plate 45 and the side wall of the translation cavity 313, and the driving block 42 moves vertically downward, driving the translation block 43 to move in the direction of the spring 46; the effect achieved by the above components is: the driving block 42 moves vertically downward, driving the translation block 43 to move in the direction of the spring 46; correspondingly, when the spring 46 pushes the translation block 43 to slide in the opposite direction, the driving block 42 moves vertically upward, and the driving block 42 drives the first fixed plate 41 to extend out of the lifting groove 311 to squeeze the external air duct 1, and at the same time the translation block 43 drives the second fixed plate 45 to extend out of the translation groove 314 to squeeze the external air duct 1. The first fixed plate 41 and the second fixed plate 45 cooperate with each other to squeeze the external air duct 1 toward the frame 2, so as to achieve relative stillness of the lower plate body 31 and the external air duct 1. The lower plate body 31 will not slide relative to the external air duct 1. Once the position of the hanging ring 35 is fixed and the position of the lower plate body 31 is fixed, the external air duct 1 will not slide relative to the locking assembly 3, the external air duct 1 will not be locally twisted, the flow of gas inside the external air duct 1 will not be affected, and it is even less likely to cause the external air duct 1 to rupture.

[0039] like Figures 1-6 As shown, in this embodiment: when the second fixed plate 45 is completely placed in the translation groove 314, the first fixed plate 41 is completely placed in the lifting groove 311; when the second fixed plate 45 partially extends out of the translation groove 314, the first fixed plate 41 partially extends out of the lifting groove 311; the effect achieved by the above components is: the first fixed plate 41 and the second fixed plate 45 can be synchronized, without affecting the relative sliding of the lower plate body 31 and the external air duct 1, while limiting the relative sliding of the lower plate body 31 and the external air duct 1, and cooperating with each other.

[0040] like Figures 1-6 As shown, in this embodiment: the connecting block 32 is inserted into the first fixing plate 41 and is slidably connected to the first fixing plate 41; the effect achieved by the above components is: the connecting block 32 will not affect the sliding of the first fixing plate 41.

[0041] In the above technical solution, in order to ensure that the first fixing plate 41 and the second fixing plate 45 do not affect the relative sliding of the lower plate body 31 and the external air duct 1, external force is required. Since the first fixing plate 41 and the second fixing plate 45 are both located inside the external air duct 1, the fingers cannot push the first fixing plate 41 and the second fixing plate 45, so a subsequent technical solution is required.

[0042] like Figures 1-6 As shown, in this embodiment: two third lifting chambers 322 are symmetrically and vertically provided in the connecting block 32, and two second lifting chambers 321 are symmetrically and horizontally provided at the bottom ends of both sides of the connecting block 32, the third lifting chamber 322 is vertically connected to the second lifting chamber 321, and two connecting lifting blocks 47 are vertically slidably connected in the two second lifting chambers 321, the connecting lifting blocks 47 are fixedly connected to the first fixed plate 41, the height of the connecting lifting blocks 47 is smaller than the second lifting chamber 321, and the height of the second lifting chamber 321 is larger than the lifting slot 311; the effect achieved by the above components is: the two connecting lifting blocks 47 rise and fall along the second lifting chamber 321, which can drive the first fixed plate 41 to rise and fall along the lifting slot 311, extending out of the lifting slot 311 or completely entering the lifting slot 311; in the process of the first fixed plate 41 extending out of the lifting slot 311 or completely entering the lifting slot 311, the second fixed plate 45 synchronously extends out of the translation slot 314 or completely enters the translation slot 314.

[0043] like Figures 1-6As shown, in this embodiment: the upper surface of the connecting lifting block 47 is fixedly connected to a lifting rod 48 that vertically lifts along the third lifting chamber 322, two vertically arranged fourth lifting chambers 331 are provided in the upper plate body 33, the lifting rod 48 passes through the fourth lifting chamber 331, and is lifted and lowered along the fourth lifting chamber 331, two fifth lifting chambers 341 are vertically provided in the support block 34, and two sixth lifting chambers 351 are vertically provided in the hanging ring 35, the two sixth lifting chambers 351 are communicated with the pressing chamber 352, and the lifting rod 48 passes through the fifth lifting chamber 341 and the sixth lifting chamber 351 in sequence; the effect achieved by the above components is: the two lifting rods 48 are fixedly connected to the upper surface of the connecting lifting block 47, and are lifted and lowered along the third lifting chamber 322, the fourth lifting chamber 331, the fifth lifting chamber 341 and the sixth lifting chamber 351, so as to drive the connecting lifting block 47 to rise and fall along the second lifting chamber 321.

[0044] like Figures 1-6 As shown, in this embodiment: a pressing cavity 352 is opened below the through hole, and a pressing block 49 is slidably connected in the pressing cavity 352, the height of the pressing block 49 is smaller than the pressing cavity 352, and two lifting rods 48 extend into the pressing cavity 352, and the two lifting rods 48 are fixedly connected to the bottom surface of the pressing block 49; the effect achieved by the above components is: when the finger presses down on the pressing block 49 at the same time, the pressing block 49 can be driven to slide down along the pressing cavity 352, and the pressing block 49 drives the lifting rod 48 to slide down, and the transmission is in sequence, so that the first fixed plate 41 and the second fixed plate 45 are respectively completely entered into the lifting groove 311 and the translation groove 314.

[0045] like Figures 1-6 As shown, in this embodiment: when the first fixed plate 41 is completely placed in the lifting groove 311, the pressing block 49 is located at the bottom of the pressing cavity 352; when the first fixed plate 41 extends out of the lifting groove 311 to the maximum extent, the pressing block 49 does not extend out of the pressing cavity 352; the effect achieved by the above components is: to limit the movement range of the pressing block 49, and prevent the pressing block 49 from affecting the locking piece from passing through the through hole on the hanging ring 35.

[0046] The operating principle of the present invention is as follows: when the locking assembly 3 needs to be moved, the pressing block 49 is first pressed downward, and the pressing block 49 drives the lifting rod 48 to slide down. The lifting rod 48 drives the first fixed plate 41 to move down along the lifting groove 311 by connecting the lifting block 47 until it completely enters the lifting groove 311. During this process, the first fixed plate 41 drives the driving block 42 to descend along the second lifting cavity 321. The driving block 42 drives the translation block 43 to move along the translation cavity 313 toward the spring 46 through the inclined surface. While the translation block 43 compresses the spring 46, it drives the second fixed plate 45 to completely enter the translation groove 314. Then, the locking assembly 3 can be moved smoothly.

[0047] When the lifting ring 35 is moved to the appropriate position, the pressing block 49 is released, the spring 46 pushes the translation block 43 to slide reversely, the translation block 43 drives the second fixed plate 45 to extend out of the translation slot 314 and extrude the outer air pipe 1, at the same time, the translation block 43 drives the driving block 42 to move vertically upward, the driving block 42 drives the first fixed plate 41 to extend out of the lifting slot 311 and extrude the outer air pipe 1, the first fixed plate 41 and the second fixed plate 45 cooperate with each other to extrude the outer air pipe 1 to the skeleton 2 direction, the position of the outer air pipe 1 and the locking assembly 3 is fixed, finally, the locking piece is inserted into the through hole on the lifting ring 35 and fixed at the corresponding position in the installation space, thus the outer air pipe 1 and the skeleton 2 are fixed.

[0048] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A composite air duct for a ship, comprising an outer air duct (1) and a frame (2), wherein the frame (2) is arranged in a spiral shape and is used to support the outer air duct (1), and is characterized in that: The frame (2) includes a bottom edge (21) and two folded edges (22), a sliding cavity (23) is formed between the bottom edge (21) and the two folded edges (22), a sliding groove (24) is formed between the ends of the two folded edges (22), the sliding cavity (23) and the sliding groove (24) are vertically connected, the frame (2) is slidably connected to a locking assembly (3), the locking assembly (3) includes a lower plate (31) slidably connected in the sliding cavity (23), a portion of the external air duct (1) is located between the lower plate (31) and the inner wall of the sliding cavity (23), and the lower plate (31) and a portion of the external air duct (1) are clearance-matched; The locking assembly (3) is provided with a fixing mechanism (4), the upper surface of the lower plate (31) is vertically provided with a lifting groove (311), the bottom end of the lifting groove (311) is symmetrically provided with two first lifting cavities (312), the two sides of the lower plate (31) are symmetrically provided with two translation grooves (314) horizontally, the two translation grooves (314) are symmetrically provided with two translation cavities (313) horizontally, the two translation cavities (313) are vertically connected with the two first lifting cavities (312), the fixing mechanism (4) includes a sliding connection in the lifting groove ( 311), two driving blocks (42) are symmetrically provided on the bottom surface of the first fixing plate (41), translation blocks (43) are slidably connected in the two translation cavities (313), the translation blocks (43) are slidably connected to the driving blocks (42), the translation block (43) extends into the translation slot (314), and the end portion is fixedly connected to a second fixing plate (45) slidably connected to the translation slot (314), and a spring (46) is provided between the side of the translation block (43) away from the second fixing plate (45) and the side wall of the translation cavity (313).

2. The marine composite air duct according to claim 1, characterized in that: The driving block (42) is vertically arranged on the bottom surface of the first fixed plate (41); a slope is provided on the side of the first fixed plate (41) away from the first fixed plate (41); an inclined cavity (44) is provided on the surface of the translation block (43) close to the driving block (42) and is slidably connected to the slope of the driving block (42); the driving block (42) moves vertically downward, driving the translation block (43) to move toward the spring (46).

3. The marine composite air duct according to claim 2, characterized in that: The first fixing plate (41) has the same size as the lifting slot (311), and the second fixing plate (45) has the same size as the translation slot (314). When the second fixing plate (45) is completely placed in the translation slot (314), the first fixing plate (41) is completely placed in the lifting slot (311). When the second fixing plate (45) partially extends out of the translation slot (314), the first fixing plate (41) partially extends out of the lifting slot (311).

4. The marine composite air duct according to claim 3, characterized in that: The locking assembly (3) further comprises a connecting block (32) fixedly mounted on the bottom surface of the lifting groove (311), the connecting block (32) being inserted into the first fixing plate (41) and slidably connected to the first fixing plate (41), the connecting block (32) being located in the sliding groove (24), and a portion of the external air duct (1) being located between the outer wall of the connecting block (32) and the side wall of the sliding groove (24).

5. The marine composite air duct according to claim 4, characterized in that: Two third lifting chambers (322) are symmetrically and vertically opened in the connecting block (32), and two second lifting chambers (321) are symmetrically and horizontally opened at the bottom ends of both sides of the connecting block (32). The third lifting chamber (322) is vertically connected to the second lifting chamber (321), and two connecting lifting blocks (47) are vertically slidably connected in the two second lifting chambers (321). The connecting lifting blocks (47) are fixedly connected to the first fixed plate (41), and the height of the connecting lifting blocks (47) is smaller than that of the second lifting chamber (321). The upper surface of the connecting lifting block (47) is fixedly connected to a lifting rod (48) that is vertically lifted and lowered along the third lifting chamber (322).

6. The marine composite air duct according to claim 5, characterized in that: The end of the connecting block (32) away from the lower plate (31) is fixedly connected to the upper plate (33), and two vertically arranged fourth lifting chambers (331) are provided in the upper plate (33). The lifting rod (48) passes through the fourth lifting chamber (331) and is lifted and lowered along the fourth lifting chamber (331). The upper plate (33) and the lower plate (31) are parallel to each other and both have an arc, and the arc matches the frame (2). The upper plate (33) is located above the two folded edges (22), and part of the external air duct (1) is located between the upper plate (33) and the two folded edges (22).

7. The marine composite air duct according to claim 6, characterized in that: A support block (34) is provided on the upper surface of the upper plate body (33), a hanging ring (35) is provided on the upper surface of the support block (34), a through hole for the locking member to pass through is provided on the hanging ring (35), a pressing cavity (352) is provided below the through hole, a pressing block (49) is slidably connected in the pressing cavity (352), and the height of the pressing block (49) is smaller than the pressing cavity (352).

8. The marine composite air duct according to claim 7, characterized in that: Two fifth lifting chambers (341) are vertically provided in the support block (34), and two sixth lifting chambers (351) are vertically provided in the hanging ring (35). The two sixth lifting chambers (351) are connected with the pressing chamber (352). The lifting rod (48) passes through the fifth lifting chamber (341) and the sixth lifting chamber (351) in sequence and extends into the pressing chamber (352). The two lifting rods (48) are fixedly connected to the bottom surface of the pressing block (49).

9. The marine composite air duct according to claim 8, characterized in that: When the first fixing plate (41) is completely placed in the lifting groove (311), the pressing block (49) is located at the bottom of the pressing cavity (352); when the first fixing plate (41) is extended out of the lifting groove (311) to the maximum extent, the pressing block (49) does not extend out of the pressing cavity (352).

10. The marine composite air duct according to claim 9, characterized in that: The frame (2) is in an open U-shaped shape on a cross-section, and a portion of the external air duct (1) is folded into the frame (2). The external air duct (1) comprises an aluminum foil layer and a glass fiber cloth layer that are laminated together.

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