Water jet load reduction device applied to water entry of navigation body

Abstract

The invention provides a water jet load reduction device applied to water entry of a navigation body, and relates to the technical field of cross-medium water entry load reduction of the navigation body, the water jet load reduction device comprises a navigation body main body component, a navigation body auxiliary connecting component and a navigation body auxiliary component, the navigation body main body component comprises a water passing bullet, a front water chamber, a piston I, a valve control system and a rear high-pressure air chamber, water is stored in the front water chamber, a piston I is arranged in the front water chamber, high-pressure gas is filled in the rear high-pressure gas chamber, and the valve control system is connected between the front water chamber and the rear high-pressure gas chamber and used for achieving internal communication of the front water chamber and the rear high-pressure gas chamber. The piston I is pushed by high-pressure gas to do rigid motion in the front water chamber, so that water flow is pushed to be ejected at a high speed through the water passing bullet. The controllable water jet is formed by actively releasing the liquid in the front water chamber, inlet water impact pressure is counteracted, meanwhile, structural weight increment and cavitation instability are avoided, and the problems that a traditional passive load reduction technology is low in efficiency and depends on environmental conditions can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of load reduction when a vehicle enters water across a medium, and in particular to a water jet load reduction device for a vehicle entering water. Background Art

[0002] When missiles, air-dropped torpedoes, and other vehicles enter water at high speed, the violent collision of the nose with the water surface triggers transient shock loads, with peak pressures reaching hundreds of MPa, leading to structural deformation, internal component damage, or trajectory instability. Traditional load reduction technologies primarily mitigate impact by optimizing the warhead shape or adding a buffer layer, but these methods have significant limitations: cavitators rely on the generation of natural cavitation bubbles to isolate the projectile from direct contact with the water. The stability of natural cavitation bubbles is significantly affected by the water entry speed, angle, and water quality, and cavitation collapse is prone to occur at low speeds or in complex water conditions, resulting in a sudden increase in load. While buffer materials can absorb some of the impact energy, they increase the vehicle's mass, reducing its payload carrying capacity. They are also prone to plastic deformation after repeated use, resulting in high maintenance costs. Furthermore, passive load reduction technologies cannot actively regulate the transient pressure distribution upon entry, making localized pressure concentration difficult to effectively suppress. Existing technologies have attempted to improve load shedding through active control methods, such as using gas jets or electromagnetically driven fluids. However, gas jets require fuel and present underwater ignition reliability issues, while electromagnetic drive systems are complex and power-hungry, making them difficult to meet the application requirements of miniaturized vehicles. Therefore, designing an efficient, lightweight, and environmentally adaptable active load shedding device has become a pressing technical challenge in this field. Summary of the Invention

[0003] In response to the technical problems raised above, a water jet load reduction device for use with a vehicle entering water is provided. This invention primarily utilizes high-pressure gas from the vehicle's internal air chamber to propel the vehicle. Upon entry, the pre-stored liquid in the chamber is released, spraying the water jet at high speed, creating a low-pressure zone isolated from the original hydrodynamic environment. This fluid momentum offsets the impact pressure wave. The device requires no external energy supply, achieves millisecond-level response through a mechanical trigger mechanism, and features a compact structure that can be integrated into the vehicle's head without adding additional mass, significantly improving load reduction efficiency and engineering applicability.

[0004] The technical means adopted in the present invention are as follows: A water jet load reduction device for use in water entry of a navigation body, comprising: a navigation body main component, a navigation body auxiliary connecting component and a navigation body auxiliary component connected in sequence from head to tail, the navigation body main component comprising a water-passing bullet, a front water chamber, a valve control system and a rear high-pressure air chamber connected in sequence from head to tail, the interior of the front water chamber storing water, the interior of the front water chamber being provided with a piston I, the interior of the rear high-pressure air chamber being filled with high-pressure gas, the valve control system being connected between the front water chamber and the rear high-pressure air chamber for achieving internal communication between the front water chamber and the rear high-pressure air chamber; the released high-pressure gas pushes the piston I to perform rigid body motion in the front water chamber, thereby pushing water to flow through the water-passing bullet and eject at high speed to form a water jet.

[0005] Furthermore, a one-way valve is connected to the rear end of the rear high-pressure air chamber, and the one-way valve is connected to the front end of the auxiliary connecting component of the navigation body.

[0006] Furthermore, the valve control system includes a valve component, which includes an internal flow channel and an opening and closing mechanism. The two sides of the flow channel are respectively an air outlet and an air inlet. The air outlet is connected to the interior of the front water chamber, and the air inlet is connected to the interior of the rear high-pressure air chamber. The opening and closing mechanism is connected to the flow channel to realize the opening and closing of the flow channel.

[0007] Furthermore, the opening and closing mechanism includes a steel ball and a movable plug, the steel ball is connected to the top of the movable plug, a slide is opened on the valve member, the slide is connected to the flow channel, and the movable plug is slidably connected in the slide and the flow channel; In the initial state, the main component of the vehicle is located in the launching bay, the inner wall of the launching bay limits the steel balls, the steel balls and the movable plug are both in an extruded state, the steel balls are limited in the slide, the movable plug is limited in the slide and the flow channel, and the flow channel is in a closed state; in the post-launch state, the main component of the vehicle is ejected from the launching bay, the steel balls are quickly ejected, the movable plug moves outward, and the flow channel is in an open state.

[0008] Furthermore, an O-ring is provided at the bottom of the flow channel and is located directly below the slideway. A high-pressure gas adapter is provided at the bottom of the O-ring, and the high-pressure gas adapter is connected to the air inlet.

[0009] Furthermore, a fixing pin insertion hole is provided on the valve component, a fixing pin is inserted into the fixing pin insertion hole, and the fixing pin is used to limit the outward movement of the movable plug.

[0010] Furthermore, a fine thread II is provided inside the front end of the valve member, and a fine thread III is provided outside the rear end of the front water chamber, and the fine thread II is connected with the fine thread III in a cooperative manner; A coarse thread II is provided on the outside of the rear end of the valve component, and a coarse thread I is provided on the inside of the front end of the rear high-pressure gas chamber. The coarse thread II is connected with the coarse thread I.

[0011] Furthermore, the water-passing bullet (11) comprises a water-passing pipe, an adapter and a water outlet provided therein, the adapter being provided at the rear end of the water-passing pipe, and the water outlet being provided at the connection point between the adapter and the front water chamber.

[0012] Furthermore, a fine thread I is provided on the outside of the rear end of the rear high-pressure air chamber, a connecting thread I is provided on the inside of the navigation body auxiliary connecting component, a fine thread IV is provided on the outside of the front end of the navigation body auxiliary component, and a connecting thread II is provided on the inside of the rear end of the navigation body auxiliary component, the fine thread I is cooperated and connected with one side of the connecting thread I, and the fine thread IV is cooperated and connected with the other side of the connecting thread I.

[0013] The purpose of the present invention is achieved in this way: after the vehicle leaves the launch bay, the steel ball pops out due to the disappearance of resistance, and at the same time triggers the release of high-pressure gas in the rear high-pressure air chamber. The high-pressure gas enters the valve component through the air inlet, and then the high-pressure gas pushes the piston I to spray the liquid in the front water chamber at high speed to form a water jet. The sprayed liquid forms a local low-pressure area in front of the warhead, offsetting the pressure wave of the water impact. After the spray is completed, the one-way valve closes to maintain the sealing of the air chamber.

[0014] Compared with the prior art, the present invention has the following advantages: 1. Traditional load reduction technologies rely on natural cavitation or passive cushioning materials. Their load reduction efficiency is limited by environmental conditions and material properties, and it is difficult to actively control transient pressure distribution. The water jet load reduction device for water entry provided by the present invention actively releases high-pressure liquid from the water chamber inside the vehicle to form a directional water jet, creating a dynamic low-pressure zone in front of the projectile, directly offsetting the water entry shock pressure wave, significantly reducing the peak pressure, and is not affected by external factors such as water quality and water entry angle.

[0015] 2. The water jet load reduction device for the entry of a navigation body into water provided by the present invention has a rear high-pressure air chamber, a front water chamber, a valve component and a one-way valve that are highly integrated inside the navigation body. No external additional structure is required, thus avoiding the weight increase problem caused by traditional buffer materials and ensuring the load capacity and maneuverability of the navigation body.

[0016] 3. The water jet load reduction device for the entry of a navigation body into water provided by the present invention has a steel ball trigger mechanism that achieves millisecond-level precise response at the moment of entry into water through dynamic matching of the fixed bomb compartment and the water pressure, ensuring the synchronization of gas release and liquid injection. In addition, the structure can adapt to navigation bodies of different speeds by adjusting the air chamber pressure and liquid capacity, and has engineering scalability, and is suitable for multiple scenarios such as missiles, torpedoes and underwater detection equipment.

[0017] Based on the above reasons, the present invention can be widely promoted in the field of load reduction design of high-speed water-entering navigation bodies such as missiles and air-dropped torpedoes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a left view of the internal structure of the navigation body of the present invention before launch.

[0020] Figure 2 It is a left view of the internal structure of the navigation body of the present invention after launch.

[0021] Figure 3 It is a left view of the internal structure of the main component of the navigation body of the present invention.

[0022] Figure 4 It is a top view of the internal structure of the main component of the navigation body of the present invention.

[0023] Figure 5 It is a left view of the valve component of the navigation body of the present invention after launch.

[0024] Figure 6 It is a left view of the valve component of the navigation body of the present invention before launching.

[0025] Figure 7 Schematic diagram of the rear high-pressure air chamber of the navigation body of the present invention.

[0026] Figure 8 It is a schematic diagram of the front water chamber and water-passing warhead of the navigation body of the present invention.

[0027] Figure 9 It is a schematic diagram of the auxiliary connecting component of the navigation body of the present invention.

[0028] Figure 10 It is a schematic diagram of the auxiliary component of the navigation body of the present invention.

[0029] In the figure: 1. Main component of the navigation body; 2. Auxiliary connecting component of the navigation body; 3. Auxiliary component of the navigation body; 11. Water-passing bullet; 12. Front water chamber; 13. Piston I; 14. Valve member; 15. Rear high-pressure air chamber; 16. One-way valve; 111, fine thread Ⅰ; 112, coarse thread Ⅰ; 121. Steel ball; 122. Fixing pin; 123. Fixing pin socket; 124. Air outlet; 125. Fine thread II; 126. O-ring; 127. High-pressure gas adapter; 128. Movable plug; 129. Coarse thread II; 130. Air inlet; 151. Water pipe; 152. Adapter; 153. Water outlet; 154. Fine thread III; 161, connecting thread Ⅰ; 171. Fine thread IV; 172. Connecting thread II. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0035] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "above" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0036] The present invention provides a water jet load reduction device for use during high-speed water entry. This device, applied during high-speed water entry, actively releases liquid from a forward chamber to form a water jet, thereby reducing the impact pressure of water entry. This device is suitable for load reduction designs for high-speed water-entering vehicles, such as missiles and air-dropped torpedoes, and addresses the low efficiency and environmental dependence of traditional passive load reduction technologies. By actively releasing liquid from a forward chamber to form a controllable water jet, the device offsets the impact pressure of water entry while simultaneously avoiding structural weight gain and cavitation instability.

[0037] The present invention provides a water jet load reduction device for a navigation body entering water, comprising a navigation body main body component 1 and a navigation body auxiliary specific structure connected in sequence from the head to the tail, wherein the navigation body auxiliary specific structure comprises a navigation body auxiliary connecting component 2 and a navigation body auxiliary component 3. The navigation body main body component 1 comprises a water-passing warhead 11, a front water chamber 12, a valve component 14, a rear high-pressure air chamber 15 and a one-way valve 16 connected in sequence from the head end to the tail end. Water is stored in the front water chamber 12, a piston Ⅰ 13 is provided in the front water chamber 12, water is stored in the front water chamber 12 between the piston Ⅰ 13 and the water-passing warhead 11, and the rear high-pressure air chamber 15 is filled with high-pressure gas. The valve component 14 is connected between the front water chamber 12 and the rear high-pressure air chamber 15, and is used to achieve internal communication between the front water chamber 12 and the rear high-pressure air chamber 15.

[0038] Specifically, the core function of the device of the present invention is to actively control the fluid dynamic load at the moment of entry into the water through the synergistic effect of multiple systems integrated in the head of the vehicle, effectively reducing the peak impact pressure. This function is achieved through the coordinated integration of the fluid guidance system, valve control system and gas-liquid injection system. The specific structural configuration is as follows: Figures 1 to 4 The detailed structure and functions of each system are described as follows: The fluid guidance system forms the sensing and transmission path for water impact pressure, consisting of the key flow paths of the water-passing projectile 11, the front water chamber 12, the valve member 14, and the rear high-pressure air chamber 15. The water-passing projectile 11 is located at the very front end of the projectile body. Its shell is precision-machined from a high-strength alloy. The front water chamber 12 is a hollow, high-strength alloy cylindrical structure that connects the water-passing projectile 11 and the valve member 14. It stores water, which is ejected at high speed through the adapter 152 and water pipe 151 inside the water-passing projectile 11 by piston I 13. This creates a new pressure field and ensures more stable water entry. The water-passing projectile 11 specifically includes an internal water pipe 151, an adapter 152, and a water outlet 153. The adapter 152 is located at the rear end of the water pipe 151, connecting the front water chamber 12 and the water-passing projectile 11. The water outlet 153 is located at the connection point between the adapter 152 and the front water chamber 12.

[0039] The valve control system is the switch and trigger of the device action. The specific structure configuration is as follows Figure 5 and Figure 6 As shown. The core components of the valve control system are the valve member 14 and its steel ball 121, fixed pin 122, fixed pin socket 123, air outlet 124, fine thread II 125, O-ring 126, high-pressure gas adapter 127, movable plug 128, coarse thread II 129, and air inlet 130. The main body of the valve member 14 is made of high-strength alloy steel. The valve member 14 has a flow channel inside, with air outlet 124 and air inlet 130 on either side of the flow channel. The air outlet 124 communicates with the interior of the front water chamber 12, and the air inlet 130 communicates with the interior of the rear high-pressure gas chamber 15. The valve member 14 has a slideway (a circular hole in the center of the valve member 14, with the steel ball 121 built in and limited by the fixed pin 122). The slideway is connected to the flow channel, and the movable plug 128 is slidably connected in the slideway and the flow channel and can move within the slideway and the flow channel. An O-ring 126 is installed at the bottom of the valve member 14 to protect the movable stopper 128 and high-pressure gas adapter 127 before launch, while also preventing leakage of high-pressure gas from the rear high-pressure gas chamber (rear high-pressure gas chamber 15). O-ring 126 is located at the bottom of the flow channel, directly below the slideway. High-pressure gas adapter 127 is located below O-ring 126 and connects to the air inlet 130. High-pressure gas adapter 127 is used to guide gas from the rear high-pressure gas chamber 15 into the valve member 14. The steel ball hole at the top of the valve member 14 (i.e., above the slideway) precisely matches the diameter of the steel ball 121 and expands in a stepped manner toward the rear to provide displacement space. The displaceable steel ball 121 is made of a precision sphere made of ultra-high-hardness, high-toughness alloy steel. The valve member 14 has a fine thread II 125 (internal thread) and a coarse thread II 129 (external thread) at the front and back of the valve member 14 for connecting the front water chamber 12 and the rear high-pressure air chamber 15. The fine thread III 154 (external thread) at the rear end of the front water chamber 12 cooperates with the fine thread II 125, and the coarse thread I 112 (internal thread) at the front end of the rear high-pressure air chamber 15 cooperates with the coarse thread II 129. At the same time, the valve member 14 has an air outlet 124 and an air inlet 130 inside. In the initial state, as Figure 6 As shown, since the vehicle is located in the launch chamber, its inner wall has the effect of blocking the steel ball 121 (the steel ball 121 is blocked by the chamber wall). When the steel ball 121 is squeezed, the movable plug 128 is in a squeezed state (the steel ball 121 is confined in the slideway, and the movable plug 128 is confined in the slideway and the flow channel, and the flow channel is in a closed state). At the same time, the movable plug 128 squeezes the O-ring 126, so that the high-pressure gas is sealed in the rear high-pressure gas chamber 15, blocking the front and rear passages. The entire vehicle is in a static state, and the valve member 14 is closed. In the state after launch, as shown in FIG. Figure 5As shown, when the vehicle is ejected from the launch bay, steel ball 121 is rapidly ejected, and movable plug 128 is secured by retaining pin 122 (retaining pin insertion hole 123 is provided on valve member 14, into which retaining pin 122 is inserted). This reduces the impact force during launch and prevents movable plug 128 from being ejected from the vehicle's main structure (vehicle main member 1). The core function is to prevent movable plug 128 from being ejected, reduce the impact force, and thus protect it.

[0040] The gas-liquid jet system stores energy and generates a high-speed gas-liquid jet when triggered. It consists of a rear high-pressure gas chamber 15 and a one-way valve 16. The rear high-pressure gas chamber 15 is a high-pressure-resistant cylindrical container, its front end sealed and connected to the rear end of the valve member 14 via threads. It is pre-filled with high-pressure dry nitrogen (high-pressure gas). The high-pressure gas serves as the jet's power source, and its expansion also creates an air cushion effect. The one-way valve 16 is installed at the rear outlet of the rear high-pressure gas chamber 15 and is connected to the front end of the auxiliary connecting member 2 of the vehicle. The one-way valve 16 allows one-way fluid flow. When the valve member 14 is opened, high-pressure gas rapidly flows through the air inlet 130 and into the valve member 14. The high-pressure gas then enters the air outlet 124 and then into the front water chamber 12, pushing piston I 13. Finally, piston I 13 performs rigid body motion within the front water chamber 12, pushing the water flow and causing the water-passing bullet 11 to continuously spray water. At the same time, once the spraying ends or the external water pressure exceeds the limit, the one-way valve 16 quickly resets and closes, tightly blocking the backflow of external water and protecting the interior of the air chamber. It should be noted that the water in the front water chamber 12 is not full, and in the initial state, the liquid level in the front water chamber 12 is lower than the water pipe 151, and will not flow into the water pipe 151 of the water-passing bullet 11.

[0041] The specific structural configuration of the navigation body is as follows: Figure 9 and Figure 10 As shown, the auxiliary connecting member 2 and the auxiliary connecting member 3 are connected by fine thread I 111, connecting thread I 161, and fine thread IV 171, respectively. The auxiliary connecting member 2 is used to connect the main member 1 and the auxiliary connecting member 3. The auxiliary connecting member 3 is primarily used to attach various sensors and counterweights, primarily to monitor the state of the vehicle during motion. The rear end of the auxiliary connecting member 3 is provided with connecting thread II 172.

[0042] Installation and use process of the present invention: In actual application, the volume of the rear high-pressure air chamber 15 is selected according to the diameter of the vehicle and the designed water entry speed, and the high-pressure nitrogen and water capacity of the front water chamber 12 are pre-filled. After the front water chamber 12 is connected to the valve component 14, it is assembled as a whole to the front end of the rear high-pressure air chamber 15; nitrogen is filled into the rear high-pressure air chamber 15; then the one-way valve 16 is installed to the tail of the rear high-pressure air chamber 15, and the vehicle auxiliary device (the vehicle auxiliary connecting component 2 and the vehicle auxiliary component 3) is connected. Finally, the steel ball 121 is installed in the steel ball hole of the valve component 14, and the vehicle is placed in the launch bay to fix the steel ball 121; the entire vehicle is placed in a stable state, and the device integration is completed.

[0043] The operation process of the present invention is as follows: when the vehicle is ejected from the launch bay (after leaving the launch bay), the steel ball 121 loses resistance, and the steel ball 121 is quickly ejected, and the movable plug 128 is in a free state. At the same time, the movable plug 128 is fixed by the fixing pin 122 to reduce the impact force during the launch of the vehicle and prevent the movable plug 128 from being ejected from the main structure of the vehicle. At the same time, the high-pressure gas in the rear high-pressure air chamber 15 is released, and the high-pressure nitrogen expands and rushes toward the air inlet 130. At this time, the valve component 14 is opened, and its movable plug 128 is in a free state. The high-pressure gas enters the valve component 14 through the air inlet 130, and the high-pressure gas pushes the piston Ⅰ13 through the air outlet 124 to form a high-speed jet of liquid in the front water chamber 12, which is rapidly ejected through the water-passing bullet 11, forming a water jet in front of the water-passing bullet 11; the water jet interacts with the original water impact pressure wave to form a local low-pressure area; after the injection continues for 50-100ms, the pressure in the rear high-pressure air chamber 15 drops below the threshold, and the one-way valve 16 closes to prevent backflow, completing the load reduction process.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water jet load reduction device for a navigation body entering water, characterized in that: include: A navigation body main component (1), a navigation body auxiliary connection component (2) and a navigation body auxiliary component (3) are sequentially connected from the beginning to the end. The navigation body main component (1) includes a water-passing bullet (11), a front water chamber (12), a valve control system and a rear high-pressure air chamber (15) which are sequentially connected from the beginning to the end. The front water chamber (12) stores water inside, a piston I (13) is provided inside the front water chamber (12), and the rear high-pressure air chamber (15) is filled with high-pressure gas. The valve control system is connected between the front water chamber (12) and the rear high-pressure air chamber (15) to achieve internal communication between the front water chamber (12) and the rear high-pressure air chamber (15); the released high-pressure gas pushes the piston I (13) to perform rigid body motion in the front water chamber (12), thereby pushing water to flow through the water-passing bullet (11) and eject at high speed to form a water jet.

2. The water jet load reduction device for a navigation body entering water according to claim 1 is characterized in that: The rear end of the rear high-pressure air chamber (15) is connected to a one-way valve (16), and the one-way valve (16) is connected to the front end of the auxiliary connecting component (2) of the navigation body.

3. The water jet load reduction device for a navigation body entering water according to claim 1 is characterized in that: The valve control system includes a valve component (14), and the valve component (14) includes a flow channel and an opening and closing mechanism provided therein. The two sides of the flow channel are respectively an air outlet (124) and an air inlet (130). The air outlet (124) is communicated with the interior of the front water chamber (12), and the air inlet (130) is communicated with the interior of the rear high-pressure air chamber (15). The opening and closing mechanism is connected to the flow channel and is used to realize opening and closing of the flow channel.

4. The water jet load reduction device for a navigation body entering water according to claim 3 is characterized in that: The opening and closing mechanism comprises a steel ball (121) and a movable plug (128), wherein the steel ball (121) is connected to the top of the movable plug (128), a slideway is provided on the valve member (14), the slideway is communicated with the flow channel, and the movable plug (128) is slidably connected in the slideway and the flow channel; In the initial state, the main component (1) of the navigation body is located in the launch chamber, the inner wall of the launch chamber limits the steel ball (121), the steel ball (121) and the movable plug (128) are both in an extruded state, the steel ball (121) is limited in the slide, the movable plug (128) is limited in the slide and the flow channel, and the flow channel is in a closed state; in the post-launch state, the main component (1) of the navigation body is ejected from the launch chamber, the steel ball (121) is quickly ejected, the movable plug (128) moves outward, and the flow channel is in an open state.

5. The water jet load reduction device for a navigation body entering water according to claim 4 is characterized in that: An O-ring (126) is provided at the bottom of the flow channel and is located directly below the slideway. A high-pressure gas adapter (127) is provided at the bottom of the O-ring (126). The high-pressure gas adapter (127) is connected to the air inlet (130).

6. The water jet load reduction device for a navigation body entering water according to claim 4 is characterized in that: The valve component (14) is provided with a fixing pin insertion hole (123), into which a fixing pin (122) is inserted, and the fixing pin (122) is used to limit the outward movement of the movable plug (128).

7. The water jet load reduction device for a navigation body entering water according to claim 3 is characterized in that: A fine thread II (125) is provided inside the front end of the valve member (14), and a fine thread III (154) is provided outside the rear end of the front water chamber (12), wherein the fine thread II (125) is cooperatively connected with the fine thread III (154); A coarse thread II (129) is provided on the outside of the rear end of the valve component (14), and a coarse thread I (112) is provided on the inside of the front end of the rear high-pressure gas chamber (15), wherein the coarse thread II (129) is connected in a cooperative manner with the coarse thread I (112).

8. The water jet load reduction device for a navigation body entering water according to claim 1 is characterized in that: The water-passing bullet (11) comprises a water-passing pipe (151), an adapter (152), and a water outlet (153) provided therein. The adapter (152) is provided at the rear end of the water-passing pipe (151), and the water outlet (153) is provided at the connection point between the adapter (152) and the front water chamber (12).

9. The water jet load reduction device for a navigation body entering water according to claim 1 is characterized in that: The rear end of the rear high-pressure air chamber (15) is provided with a fine thread I (111) on the outside, the navigation body auxiliary connecting component (2) is provided with a connecting thread I (161) on the inside, the front end of the navigation body auxiliary component (3) is provided with a fine thread IV (171) on the outside, the rear end of the navigation body auxiliary component (3) is provided with a connecting thread II (172) on the inside, the fine thread I (111) is connected to one side of the connecting thread I (161), and the fine thread IV (171) is connected to the other side of the connecting thread I (161).

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