An underwater locking and closing device for an engine air intake and a cross-medium engine

Abstract

The present invention provides an underwater locking and sealing device for an engine air intake duct and a trans-medium engine, relating to the technical field of trans-medium aircraft. The underwater locking and sealing device for the engine air intake duct comprises an inner tube and an extrusion locking structure. The inner tube is used to connect to the air inlet of the engine air intake duct and is made of a shape-memory polymer composite material. The extrusion locking structure is disposed on the outer side of the inner tube. When the inner tube is in a soft state, the extrusion locking structure is used to squeeze the inner tube, causing the middle portion of the inner tube to be squeezed inward to close the air inlet. When the inner tube is in a soft state, the extrusion locking structure is used to release the squeeze on the inner tube, allowing the inner tube to recover its deformation and open the air inlet. This underwater locking and sealing device for the engine air intake duct can make the opening and closing of the air intake duct more convenient and effective, facilitating smooth switching of aircraft states.

Description

Technical Field

[0001] The present invention relates to the technical field of trans-medium aircraft, and in particular to an underwater locking and closing device for an engine air inlet and a trans-medium engine. Background Art

[0002] The cross-medium aircraft can enter the water to achieve stealth. When in the air, the air intake of its engine air intake duct needs to be open, and when diving in the water, the air intake of its engine air intake duct needs to be closed.

[0003] Currently, sealing structures are often designed in engines to achieve underwater closure of the air inlet duct. However, current sealing structures usually adopt complex mechanical structures. Complex structures are difficult to operate and control, which is not conducive to the effective opening and closing of the air inlet duct and affects the normal switching of the aircraft status. Summary of the Invention

[0004] The problem solved by the present invention is how to make the opening and closing of the air inlet more convenient and effective, so as to ensure the normal switching of the aircraft state.

[0005] In order to solve the above problems, the present invention provides an underwater locking and closing device for an engine air intake duct, comprising an inner tube and an extrusion locking structure; the inner tube is used to be connected to the air inlet of the engine air intake duct, and the material of the inner tube is a shape memory polymer composite material; the extrusion locking structure is arranged on the outside of the inner tube, and the extrusion locking structure is used to squeeze the inner tube when the inner tube is in a soft state so that the middle part of the inner tube is squeezed and gathered inward to close the air inlet, and is used to release the extrusion of the inner tube when the inner tube is in the soft state so that the inner tube can restore its deformation to open the air inlet.

[0006] Optionally, the extrusion locking structure includes a plurality of double-hinge structures arranged along the circumference of the inner tube, the double-hinge structure including a first hinged hinge and a second hinged hinge, one end of the first hinged hinge and the second hinged hinge being hinged, and the other ends of the first hinged hinge and the second hinged hinge can be close to or away from each other to make the double-hinge structure fold or unfold; when the plurality of double-hinge structures are folded respectively, the plurality of double-hinge structures jointly extrude the inner tube, and when the plurality of double-hinge structures are unfolded respectively, the plurality of double-hinge structures release the extrusion of the inner tube.

[0007] Optionally, it also includes a mounting tube, which is sleeved on the inner tube; a plurality of double-hinge structures are arranged between the mounting tube and the inner tube, in the double-hinge structure, a fixed block is provided at the end of the first hinged leaf away from the second hinged leaf, the fixed block is hinged to the first hinged leaf and fixed to the mounting tube, and a slider is provided at the end of the second hinged leaf away from the first hinged leaf, the slider is hinged to the second hinged leaf, and the slider is slidably installed on the mounting tube along the axial direction of the inner tube to drive the opposite ends of the first hinged leaf and the second hinged leaf to approach or move away from each other.

[0008] Optionally, the wall of the mounting cylinder is provided with an elongated hole extending axially along the inner tube; the fixing block is fixed to one end of the elongated hole; and the slider is slidably installed in the elongated hole along the extension direction of the elongated hole.

[0009] Optionally, the sliding block includes a protrusion protruding from the side of the elongated hole away from the inner tube; a ring sleeve is provided on the movable sleeve of the mounting cylinder, and the ring sleeve is connected to the protrusion.

[0010] Optionally, a driving motor is further included, which is connected to the ring sleeve and is used to drive the ring sleeve to reciprocate along the axial direction of the inner tube relative to the mounting tube to drive the slider to slide in the elongated hole.

[0011] Optionally, the cross-section of the mounting tube is hexagonal; the first hinge leaf and the second hinge leaf are of the same size and are respectively triangular; when the opposite ends of the first hinge leaf and the second hinge leaf of each double-hinge structure approach each other, the projections of the multiple double-hinge structures on the cross-section of the inner tube fill the interior of the projection of the mounting tube on the cross-section of the inner tube.

[0012] Optionally, a heating structure is further included, which is connected to the inner tube and is used to adjust the temperature of the inner tube to a first temperature or a second temperature, wherein the first temperature is lower than the second temperature. When the inner tube is at the first temperature, the inner tube is in a rigid state, and when the inner tube is at the second temperature, the inner tube is in the soft state.

[0013] Optionally, the control method of the underwater locking and closing device of the engine air inlet includes an air inlet closing method and an air inlet opening method;

[0014] The air inlet sealing method includes: adjusting the temperature of the inner tube to the second temperature by the heating structure, so that the inner tube enters the soft state; squeezing the inner tube by the squeezing and locking structure so that the middle portion of the inner tube is squeezed and gathered inward to seal the air inlet; and adjusting the temperature of the inner tube to the first temperature by the heating structure, so that the inner tube enters the rigid state;

[0015] The air inlet opening method includes: adjusting the temperature of the inner tube to the second temperature through the heating structure so that the inner tube enters the soft state; releasing the extrusion of the inner tube through the extrusion locking structure so that the inner tube recovers its deformation to open the air inlet; and adjusting the temperature of the inner tube to the first temperature through the heating structure so that the inner tube enters the rigid state.

[0016] The present invention also provides a cross-media engine, comprising an engine air inlet and the engine air inlet underwater locking and closing device as described above, wherein the inner tube of the engine air inlet underwater locking and closing device is connected to the air inlet of the engine air inlet.

[0017] Compared with the prior art, the underwater locking and closing device for an engine air intake provided by the present invention has, but is not limited to, the following technical effects:

[0018] In the underwater locking and closing device for the engine air intake provided by the present invention, the inner tube is used to connect the air inlet of the engine air intake, and the shape memory polymer composite material of the inner tube can switch between a soft state and a rigid state. By arranging the extrusion locking structure on the outside of the inner tube, when the air intake needs to be sealed, the inner tube can be first stimulated by means such as heat, magnetism or infrared light to make the inner tube soft, and then the inner tube is squeezed by the extrusion locking structure so that the middle part of the inner tube gathers inward to close the air inlet, thereby achieving the sealing of the air intake. Conversely, when the air intake needs to be opened, the deformed inner tube can be first made soft, and then the extrusion locking structure can be used to release the squeezing of the inner tube so that the inner tube automatically restores its deformation, that is, the inner tube restores its original tubular shape, and then the air inlet can be opened, thereby achieving the opening of the air intake. In this way, the opening and closing of the air inlet can be achieved, with a simple structure and easy operation and control. At the same time, the shape memory polymer composite material is used as the inner tube, which can make the inner tube have stable and reliable deformation ability in a soft state, and the closing or opening of the air inlet is more effective. In this way, the opening and closing of the air inlet is more convenient and effective, which is conducive to the smooth switching of the aircraft state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an underwater locking and closing device for an engine air intake duct according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the underwater locking and sealing device of the engine air intake duct according to an embodiment of the present invention when it is in a closed state;

[0021] Figure 3 This is a schematic diagram of the underwater locking and sealing device of the engine air intake duct in an embodiment of the present invention when it is in an open state;

[0022] Figure 4 This is a partial structural diagram of an underwater locking and closing device for an engine air intake duct according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic structural diagram of an extrusion locking structure according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic structural diagram of a double hinge structure according to an embodiment of the present invention;

[0025] Figure 7 This is a left side view of the underwater locking and sealing device of the engine air intake duct (without the inner tube) in a closed state according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1-inner tube, 2-extrusion locking structure, 21-double hinge structure, 211-first hinge leaf, 2111-fixing block, 212-second hinge leaf, 2121-slider, 2121a-protrusion, 3-mounting cylinder, 31-long hole, 4-ring sleeve. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In this way, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, in the description of the present invention, the description of the term "embodiment" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present invention. In the present invention, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or implementations.

[0030] In the description of the present invention, it should be understood that if there are terms such as "up", "down", "front", "back", "left" and "right", the orientation or position relationship indicated by them is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0031] In addition, in the description of the present invention, the X-axis in the accompanying drawings represents the horizontal direction and is designated as the front-to-back position, and the positive direction of the X-axis represents the front, and accordingly, the reverse direction of the X-axis represents the rear; the Y-axis in the accompanying drawings represents the horizontal direction and is designated as the left-to-right position, and the positive direction of the Y-axis represents the left, and accordingly, the reverse direction of the Y-axis represents the right; the Z-axis in the accompanying drawings represents the vertical direction, that is, the up-down position, and the positive direction of the Z-axis represents the top, and accordingly, the reverse direction of the Z-axis represents the bottom. It should be noted that the aforementioned X-axis, Y-axis, and Z-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] Please refer to Figure 1 An embodiment of the present invention provides an underwater locking and closing device for an engine air intake duct, comprising an inner tube 1 and an extrusion locking structure 2; the inner tube 1 is used to be connected to the air inlet of the engine air intake duct, and the material of the inner tube 1 is a shape memory polymer composite material; the extrusion locking structure 2 is arranged on the outside of the inner tube 1, and the extrusion locking structure 2 is used to squeeze the inner tube 1 when the inner tube 1 is in a soft state so that the middle part of the inner tube 1 is squeezed and gathered inward to close the air inlet, and is used to release the squeezing of the inner tube 1 when the inner tube 1 is in the soft state so that the inner tube 1 recovers its deformation to open the air inlet.

[0033] It should be noted that shape memory polymer composite materials usually have a soft state and a rigid state, and can switch between the soft state and the rigid state. When in the soft state, the inner tube 1 can be deformed under the action of external force. At this time, the inner tube 1 is in a low modulus state and has low hardness. It can easily deform under external stimulation and can recover the deformation when the external stimulation stops; when in the rigid state, the inner tube 1 maintains a smooth tube wall. At this time, the inner tube 1 is in a high modulus state, has high hardness and has load-bearing characteristics.

[0034] In this embodiment, the inner tube 1 is used to connect to the air inlet of the engine intake duct, and the shape memory polymer composite material of the inner tube 1 can switch between a soft state and a rigid state. By arranging the extrusion locking structure 2 on the outside of the inner tube 1, when it is necessary to seal the air inlet duct, the inner tube 1 can be stimulated by means such as heat, magnetism or infrared light to make the inner tube 1 soft. Then, the extrusion locking structure 2 squeezes the inner tube so that the middle part of the inner tube 1 gathers inward to seal the air inlet (see Figure 2 The air intake duct is sealed. On the contrary, when the air intake duct needs to be opened, the deformed inner tube 1 can be softened first, and then the inner tube 1 is automatically restored to its original shape by squeezing the locking structure 2. The air intake duct can then be opened (see Figure 3 The air intake is opened and closed in this manner, achieving a simple structure and convenient operation and control. Furthermore, the shape memory polymer composite material used as the inner tube 1 enables the inner tube 1 to have stable and reliable deformation capabilities in a soft state, making the air intake opening and closing more effective. This makes the air intake opening and closing more convenient and effective, facilitating smooth switching of aircraft states.

[0035] Alternatively, see Figures 4 to 6 The extrusion locking structure 2 includes a plurality of double-hinge structures 21 arranged along the circumference of the inner tube 1, and the double-hinge structure 21 includes a first hinged leaf 211 and a second hinged leaf 212. One end of the first hinged leaf 211 and the second hinged leaf 212 are hinged, and the other ends of the first hinged leaf 211 and the second hinged leaf 212 can approach or move away from each other to make the double-hinge structure 21 fold or unfold; when the plurality of double-hinge structures 21 are folded respectively, the plurality of double-hinge structures 21 jointly squeeze the inner tube 1, and when the plurality of double-hinge structures 21 are unfolded respectively, the plurality of double-hinge structures 21 release the squeezing of the inner tube 1.

[0036] For details, please refer to Figure 5 , the number of double hinge structures 21 is six; please refer to Figure 6 The first hinge leaf 211 and the second hinge leaf 212 are arranged in sequence along the axial direction of the inner tube 1, and the rotation axis of the hinged connection between the first hinge leaf 211 and the second hinge leaf 212 is parallel to the radial direction of the inner tube 1.

[0037] In this embodiment, the extrusion locking structure 2 is provided as a plurality of double-hinge structures 21, and each double-hinge structure 21 includes a first hinged joint 211 and a second hinged joint 212 that are hingedly connected. Thus, when the plurality of double-hinge structures 21 are folded, the plurality of double-hinge structures 21 can jointly squeeze the inner tube 1, causing the middle portion of the inner tube 1 to gather inward and close the air inlet. When the plurality of double-hinge structures 21 are unfolded, the plurality of double-hinge structures 21 release the squeeze on the inner tube 1. In this way, the squeezing or releasing of the inner tube 1 is achieved, and the structure of the double-hinge structure 21 is simple, and is convenient for assembly and maintenance.

[0038] Alternatively, see Figure 1 and Figure 6 The underwater locking and closing device of the engine air intake duct also includes a mounting tube 3, which is sleeved on the inner tube 1; a plurality of double-hinge structures 21 are arranged between the mounting tube 3 and the inner tube 1, and in the double-hinge structure 21, a fixing block 2111 is provided at the end of the first hinged joint leaf 211 away from the second hinged joint leaf 212, and the fixing block 2111 is hinged to the first hinged joint leaf 211 and fixed to the mounting tube 3, and a slider 2121 is provided at the end of the second hinged joint leaf 212 away from the first hinged joint leaf 211, and the slider 2121 is hinged to the second hinged joint leaf 212, and the slider 2121 is slidably installed on the mounting tube 3 along the axial direction of the inner tube 1 to drive the opposite ends of the first hinged joint leaf 211 and the second hinged joint leaf 212 to move closer to or away from each other.

[0039] Specifically, the mounting cylinder 3 is used to be fixed on the engine.

[0040] In this embodiment, a mounting tube 3 is arranged outside the inner tube 1, and the end of the first hinge leaf 211 is fixed to the mounting tube 3 by a fixing block 2111, and the end of the second hinge leaf 212 is slidably mounted on the mounting tube 3 by a slider 2121. In this manner, by driving the slider 2121 to slide relative to the mounting tube 3, the second hinge leaf 212 and the first hinge leaf 211 can be driven to move relatively closer to or away from each other, thereby driving the double hinge structure 21 to fold or unfold.

[0041] Alternatively, see Figure 1 The wall of the mounting tube 3 is provided with an elongated hole 31 extending along the axial direction of the inner tube 1; the fixing block 2111 is fixed to one end of the elongated hole 31; the slider 2121 is slidably installed in the elongated hole 31 along the extension direction of the elongated hole 31.

[0042] In this embodiment, by setting an elongated hole 31 on the mounting tube 3 and sliding the slider 2121 in the elongated hole 31, the sliding installation of the slider 2121 on the mounting tube 3 is realized. It is only necessary to open the elongated hole 31 in the mounting tube 3, which helps to reduce the difficulty of processing and assembling the device.

[0043] Alternatively, see Figure 1 and Figure 5 The slider 2121 includes a protrusion 2121a protruding from the side of the elongated hole 31 away from the inner tube 1; a ring sleeve 4 is movably provided on the mounting tube 3, and the ring sleeve 4 is connected to the protrusion 2121a.

[0044] In this embodiment, the ring sleeve 4 movably sleeved on the mounting tube 3 is connected to the protrusion 2121a of the slider 2121. In this way, when the ring sleeve 4 moves along the outer wall of the mounting tube 3, it can drive the slider 2121 to slide along the elongated hole 31. The sleeve installation of the ring sleeve 4 on the mounting tube 3 can also guide the movement of the ring sleeve 4, thereby ensuring that the folding and unfolding actions of the double hinge structure 21 are more stable and reliable.

[0045] Optionally, the engine air intake underwater locking and closing device also includes a driving motor, which is driven by the ring sleeve 4 and is used to drive the ring sleeve 4 to reciprocate axially along the inner tube 1 relative to the mounting tube 3 to drive the slider 2121 to slide in the elongated hole 31.

[0046] Specifically, the driving motor is fixed on the mounting cylinder 3 .

[0047] In this embodiment, the driving motor can drive the ring sleeve 4 to reciprocate along the outer wall of the installation tube 3, thereby realizing automatic control of the movement of the double hinge structure 21.

[0048] Alternatively, see Figure 7 The cross-section of the mounting tube 3 is hexagonal; the first hinged leaf 211 and the second hinged leaf 212 are of the same size and are respectively triangular; when the opposite ends of the first hinged leaf 211 and the second hinged leaf 212 of each double-hinge structure 21 approach each other, the projections of the multiple double-hinge structures 21 on the cross-section of the inner tube 1 fill the interior of the projection of the mounting tube 3 on the cross-section of the inner tube 1.

[0049] It can be understood that when the two ends of the first hinge leaf 211 and the second hinge leaf 212 of each double-hinge structure 21 are close to each other, that is, the first hinge leaf 211 and the second hinge leaf 212 are in a state of mutual adhesion, at this time, the projection of the double-hinge structure 21 on the cross section of the inner tube 1, that is, the XOZ plane, is a triangular projection, and the projections of multiple double-hinge structures 21 constitute a hexagonal projection, which just fills the interior of the projection of the mounting tube 3.

[0050] In this embodiment, the projections of the multiple double-hinge structures 21 on the cross section of the inner tube 1 fill the interior of the projection of the mounting tube 3 on the cross section of the inner tube 1 when folded, so as to ensure that the multiple double-hinge structures 21 can fully squeeze and gather the inner tube 1, thereby improving the sealing effect of the air inlet.

[0051] Optionally, the underwater locking and closing device of the engine air intake duct also includes a heating structure, which is connected to the inner tube 1. The heating structure is used to adjust the temperature of the inner tube 1 to a first temperature or a second temperature, wherein the first temperature is lower than the second temperature. When the inner tube 1 is at the first temperature, the inner tube 1 is in a rigid state, and when the inner tube 1 is at the second temperature, the inner tube 1 is in the soft state.

[0052] It should be noted that the first temperature can be room temperature, and the second temperature can be a temperature value higher than room temperature after heating. After the heating structure heats and adjusts the temperature of the inner tube 1 to the second temperature, the inner tube 1 can enter a soft state to facilitate extrusion deformation; after the heating structure adjusts the temperature of the inner tube 1 to the first temperature, for example, by stopping the heating of the inner tube 1 to restore it to room temperature, the inner tube 1 can enter a rigid state.

[0053] In this embodiment, the heating structure is provided to facilitate the switching of the inner tube 1 between the soft state and the rigid state. Thus, after the extrusion locking structure 2 completes the extrusion of the inner tube, the temperature of the inner tube 1 can be immediately controlled to the first temperature, so that the inner tube 1 enters a rigid state with greater hardness, ensuring that the air inlet is stably closed. After the extrusion locking structure 2 releases the extrusion of the inner tube, the temperature of the inner tube 1 can also be immediately controlled to the first temperature, so that the inner tube 1 enters a rigid state with greater hardness, ensuring that the air inlet is stably opened.

[0054] Optionally, the control method of the underwater locking and sealing device of the engine air intake duct includes an air intake closing method and an air intake opening method. The air intake closing method includes: adjusting the temperature of the inner tube to the second temperature by the heating structure, so that the inner tube enters the soft state; squeezing the inner tube by the extrusion locking structure so that the middle part of the inner tube is squeezed and gathered inward to close the air intake; adjusting the temperature of the inner tube to the first temperature by the heating structure, so that the inner tube enters the rigid state. The air intake opening method includes: adjusting the temperature of the inner tube to the second temperature by the heating structure, so that the inner tube enters the soft state; releasing the squeezing of the inner tube by the extrusion locking structure so that the inner tube recovers its deformation to open the air intake; adjusting the temperature of the inner tube to the first temperature by the heating structure, so that the inner tube enters the rigid state.

[0055] In this embodiment, the air inlet closing method is used to control the air inlet closing, that is, to achieve the sealing of the air inlet duct; the air inlet opening method is used to control the air inlet opening, that is, to achieve the opening of the air inlet duct, which is convenient to control and the opening and closing of the air inlet duct is stable and reliable.

[0056] Of course, in other embodiments, the state change of the inner tube 1 can also be controlled by magnetism, infrared light, etc.

[0057] An embodiment of the present invention further provides a cross-medium engine, which includes an engine air intake and the underwater locking and closing device for the engine air intake as described above, wherein the inner tube 1 of the underwater locking and closing device for the engine air intake is connected to the air inlet of the engine air intake.

[0058] In this embodiment, since the cross-medium engine adopts all the technical solutions of all the embodiments of the above-mentioned engine air inlet underwater locking and closing device, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0059] Optionally, the inner tube 1 is integrally formed with the air intake end of the engine air intake duct so that the inner tube 1 constitutes a part of the engine air intake duct. This arrangement ensures the sealing performance of the connection between the inner tube 1 and the engine air intake duct, thereby improving the underwater sealing performance of the engine air intake duct.

[0060] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An underwater locking and closing device for an engine air intake, characterized in that: The invention comprises an inner tube (1) and an extrusion locking structure (2); the inner tube (1) is used to be connected to the air inlet of the engine air inlet duct, and the material of the inner tube (1) is a shape memory polymer composite material; the extrusion locking structure (2) is arranged on the outside of the inner tube (1), and the extrusion locking structure (2) is used to squeeze the inner tube (1) when the inner tube (1) is in a soft state so that the middle part of the inner tube (1) is squeezed and gathered inward to close the air inlet, and is used to release the squeezing of the inner tube (1) when the inner tube (1) is in the soft state so that the inner tube (1) recovers its deformation to open the air inlet; the extrusion locking structure (2) comprises a plurality of holes along the inner tube (1) and a plurality of holes. A plurality of double-hinge structures (21) are arranged circumferentially, the double-hinge structures (21) comprising a first hinged leaf (211) and a second hinged leaf (212), one end of the first hinged leaf (211) and the second hinged leaf (212) being hinged, and the other ends of the first hinged leaf (211) and the second hinged leaf (212) can move closer to or farther from each other to allow the double-hinge structure (21) to be folded or unfolded; when the plurality of double-hinge structures (21) are folded, the plurality of double-hinge structures (21) jointly squeeze the inner tube (1), and when the plurality of double-hinge structures (21) are unfolded, the plurality of double-hinge structures (21) release the squeezing of the inner tube (1).

2. The underwater locking and sealing device for the engine air intake according to claim 1, characterized in that: The invention also includes a mounting tube (3), wherein the mounting tube (3) is sleeved on the inner tube (1); a plurality of double-hinge structures (21) are arranged between the mounting tube (3) and the inner tube (1); in the double-hinge structure (21), a fixing block (2111) is provided at the end of the first hinged joint leaf (211) away from the second hinged joint leaf (212); the fixing block (2111) is hinged to the first hinged joint leaf (211) and fixed to the mounting tube (3); a slider (2121) is provided at the end of the second hinged joint leaf (212) away from the first hinged joint leaf (211); the slider (2121) is hinged to the second hinged joint leaf (212); the slider (2121) is slidably mounted on the mounting tube (3) along the axial direction of the inner tube (1) to drive the ends of the first hinged joint leaf (211) and the second hinged joint leaf (212) that are away from each other to move closer to or away from each other.

3. The underwater locking and sealing device for the engine air intake according to claim 2, characterized in that: The wall of the mounting cylinder (3) is provided with an elongated hole (31) extending in the axial direction of the inner tube (1); the fixing block (2111) is fixed to one end of the elongated hole (31); and the sliding block (2121) is slidably installed in the elongated hole (31) along the extending direction of the elongated hole (31).

4. The underwater locking and sealing device for the engine air intake according to claim 3, characterized in that: The slider (2121) comprises a protruding portion (2121a) protruding from the side of the elongated hole (31) facing away from the inner tube (1); a ring sleeve (4) is movably provided on the mounting cylinder (3), and the ring sleeve (4) is connected to the protruding portion (2121a).

5. The underwater locking and sealing device for the engine air intake according to claim 4, characterized in that: It also includes a driving motor, which is connected to the ring sleeve (4) and is used to drive the ring sleeve (4) to reciprocate along the axial direction of the inner tube (1) relative to the mounting tube (3) to drive the slider (2121) to slide in the elongated hole (31).

6. The underwater locking and sealing device for the engine air intake according to claim 2, characterized in that: The cross section of the installation tube (3) is hexagonal; the first hinged joint leaf (211) and the second hinged joint leaf (212) are of the same size and are respectively triangular; when the two opposite ends of the first hinged joint leaf (211) and the second hinged joint leaf (212) of each double hinge structure (21) approach each other, the projections of the multiple double hinge structures (21) on the cross section of the inner tube (1) fill the interior of the projection of the installation tube (3) on the cross section of the inner tube (1).

7. The underwater locking and sealing device for an engine air intake according to claim 1, characterized in that: The invention also includes a heating structure, wherein the heating structure is connected to the inner tube (1), and the heating structure is used to adjust the temperature of the inner tube (1) to a first temperature or a second temperature, wherein the first temperature is lower than the second temperature. When the inner tube (1) is at the first temperature, the inner tube (1) is in a rigid state, and when the inner tube (1) is at the second temperature, the inner tube (1) is in the soft state.

8. The underwater locking and sealing device for the engine air intake according to claim 7, characterized in that: The control method of the underwater locking and closing device of the engine air intake includes an air intake closing method and an air intake opening method; The air inlet sealing method comprises: adjusting the temperature of the inner tube (1) to the second temperature by the heating structure, so that the inner tube (1) enters the soft state; squeezing the inner tube (1) by the squeezing and locking structure (2) so that the middle part of the inner tube (1) is squeezed and gathered inwards, so as to seal the air inlet; adjusting the temperature of the inner tube (1) to the first temperature by the heating structure, so that the inner tube (1) enters the rigid state; The air inlet opening method comprises: adjusting the temperature of the inner tube (1) to the second temperature by the heating structure, so that the inner tube (1) enters the soft state; releasing the squeezing of the inner tube (1) by the squeezing locking structure (2) so that the inner tube (1) recovers its deformation, thereby opening the air inlet; and adjusting the temperature of the inner tube (1) to the first temperature by the heating structure, so that the inner tube (1) enters the rigid state.

9. A cross-medium engine, characterized in that: It comprises an engine air intake duct and an underwater locking and sealing device for the engine air intake duct as claimed in any one of claims 1 to 8, wherein the inner tube (1) of the underwater locking and sealing device for the engine air intake duct is connected to the air inlet of the engine air intake duct.

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