External air bag type combined load reduction device and method for high-speed water entry of navigation body

Abstract

The invention discloses an external air bag type combined load reduction device and method for high-speed water entry of a navigation body. The external air bag type combined load reduction device structurally and mainly comprises a telescopic load reduction rod, an air bag load reduction device and a buffer module. The telescopic load-reducing rod comprises a disc-shaped cavitator, a cylindrical rod and a base, the tail base is matched with the navigation body through a stepped hole, the air bag load-reducing device comprises a foldable air bag and an air generating device, the air bag is arranged on the side wall of the cylindrical rod, and the buffer module is arranged in the stepped hole. After the navigation body enters water at a high speed, the load reduction rod shrinks, the air bag is inflated and expanded, the load reduction module compresses and absorbs energy to reduce the impact load of the navigation body entering water, the load reduction rod shrinks completely after the air bag falls off, and the follow-up movement of the navigation body is not affected. Through an external airbag type combined load reduction mode, the high-speed water entry stability of the navigation body is improved, and safe water entry of the navigation body is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of load reduction when a navigation body enters water across a medium at high speed, and in particular to an external airbag-type combined load reduction device and method for a navigation body entering water at high speed. Background Art

[0002] When a vehicle enters the water at high speed, it will be subjected to a huge impact load due to the sudden change in medium density. This strong load will damage the structure of the vehicle, cause failure of internal components, and cause instability of the underwater trajectory, which will greatly damage its performance. Therefore, it is necessary to reduce the impact load that the vehicle is subjected to when entering the water at high speed.

[0003] The airbag load-reducing structure disclosed in the prior art can reduce the load of the navigation body to a certain extent during the water entry process through the buoyancy of the airbag after it is inflated, but the airbag load-reducing method still has limitations. If it is installed on the side wall of the navigation body, it cannot effectively reduce the load on the head; if it is installed on the end face of the head, it will not only affect the stability of the navigation body entering the water, but also cannot be separated in time, which will hinder the movement of the navigation body after entering the water. Therefore, it is necessary to optimize the design of the airbag load-reducing structure. Summary of the invention

[0004] The object of the present invention is to provide an external airbag combined load-reducing device and method for high-speed water entry of a navigation body, so as to make up for the problem that the existing airbag device has limited load-reducing capacity when the navigation body enters water.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] An external airbag-type combined load-reducing device for a navigation body entering water at high speed, comprising:

[0007] The disc cavitator is used as the contact part of the navigation body that contacts the water when entering the water;

[0008] A connecting rod, the two ends of which are respectively connected to the disc cavitator and the chassis, and are used to install the gas generating device, the control device and the electromagnet;

[0009] A foldable airbag is arranged between the outer wall of the connecting rod and the sleeve, and can be inflated and expanded to reduce the load when the gas generating device is activated;

[0010] A fixing module, used for connecting the foldable airbag, embedded in the connecting rod and directly provided with a separation module with the embedded connecting rod, and capable of limiting the position of the connecting rod after contraction;

[0011] The electromagnet is used to attract the fixing module under the action of magnetic force, so that the fixing module is connected to the connecting rod, and in the case of power failure, the fixing module is separated from the connecting rod through the separation module to achieve the separation of the multiple foldable airbags in the inflated state;

[0012] The sleeve is used to fix the foldable airbag, which is arranged between the disc cavitator and the end surface of the navigation body and can be broken under a certain pressure;

[0013] The chassis is arranged in the navigation body, can move axially relative to the navigation body, and a buffer module is provided between the chassis and the navigation body for compression energy absorption;

[0014] The pressure detection unit is used to monitor the water entry pressure of the disc cavitator. When the set value is reached, the control device controls the gas generating device and the electromagnet through timing, generates combustion gas through the gas generating device to inflate the foldable airbag, and controls the electromagnet to cut off power to achieve the separation of the foldable airbag in the inflated state.

[0015] An external airbag-type combined load-reducing device for a navigation body entering water at high speed, wherein the load-reducing method comprises:

[0016] Stage 1: The disc cavitator touches the water first, and under the axial force, it quickly shrinks into the navigation body and compresses the sleeve. At this time, the sleeve is crushed by pressure, and the disc cavitator transmits the axial force to the chassis through the connecting rod and compresses the buffer module. The buffer module compresses and absorbs energy. The pressure detection unit detects that the pressure signal reaches the set value and transmits the signal to the control device to inflate the foldable airbag; Stage 2: The sleeve is completely crushed under the action of the compression of the disc cavitator and the inflation of the foldable airbag. The foldable airbag is fully unfolded and contacts the liquid. At this moment, the fixed module is stuck at the disc cavitator and the end face of the navigation body, which plays an axial limiting role on the disc cavitator; Stage 3: The control device controls the fixed module to lose its magnetic attraction and lose its function. The disc cavitator contacts the front end face of the navigation body, the buffer module is compressed to the limit, and the navigation body enters the stable navigation stage.

[0017] Compared with the prior art, the present invention has the following significant advantages:

[0018] (1) The present invention provides an external airbag-type combined load-reducing device for a navigation body to enter water at high speed. The device is simple and reliable. The disc cavitator and the cylindrical rod of the retractable load-reducing rod are easy to disassemble and assemble, and it is convenient to replace the power supply and the reactants in the gas generator; the buffer module does not need to be frequently replaced and can be recycled many times; the foldable airbag can maintain the integrity of the structure under strong impact loads and give full play to the load-reducing capacity. After leaving the navigation body, it can float to the water surface due to the buoyancy and can be recycled together with the fixed module.

[0019] (2) The present invention overcomes the defects of the traditional airbag in that the load-reducing capacity of the head of the navigation body is limited, which affects the underwater ballistic stability of the navigation body and interferes with the normal trajectory of the navigation body. The axial force generated by the structure during the entry into the water is not directly transmitted to the navigation body, but is further reduced through the buffer module. The airbag load-reducing device is locked by the fixed module and unfolds on the side wall of the cylindrical rod to play a load-reducing role. The fixed module is indirectly controlled by the charging and discharging of the electromagnet to achieve controllable separation of the airbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the external airbag-type combined load-reducing structure of the navigation body entering the water at high speed;

[0021] Figure 2 It is a schematic diagram of the structure of a telescopic load-reducing rod;

[0022] Figure 3 It is a cross-sectional view of the external airbag-type combined load-reducing structure of the navigation body entering the water at a high speed;

[0023] Figure 4 It is a second cross-sectional view of the external airbag-type combined load-reducing structure of the navigation body entering the water at high speed;

[0024] Figure 5 yes Figure 4 Middle AA section cutaway view;

[0025] Figure 6 It is a three-section view of the external airbag-type combined load-reducing structure of the navigation body entering the water at high speed during the water entry phase. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, an external airbag-type combined load-reducing device for high-speed water entry of a navigation body in this embodiment mainly includes a retractable load-reducing rod 1, an airbag load-reducing device and a buffer module 9.

[0028] The retractable load-reducing rod 1 includes a disc cavitator 2, a cylindrical rod 3 and a chassis 4, wherein the disc cavitator 2 is detachably fixedly connected to the cylindrical rod 3, and the cylindrical rod 3 is connected to the chassis 4 through a thread 18. A pressure sensor 12 is installed at the bottom of the disc cavitator 2, and a cavity is provided inside the cylindrical rod 3 for installing an electromagnet 13, a power supply 11, a switch 10, a gas generator 15 and a gas control device 16. The power supply 11 is connected to the gas generator 15 and the gas control device 16, and is used to supply power to the gas generator 15 and the gas control device 16, and is connected to the electromagnet 13 through the switch 10, and the switch is in a normally closed state (electronic switch such as a relay), the electromagnet 13 is used for magnetically adsorbing the fixed module 6, and the gas control device 16 is used to control the gas generator 15 to generate high-pressure gas for inflating the foldable airbag 7, and controlling the open and closed state of the switch.

[0029] The airbag load reduction device includes a foldable airbag 7, a gas generator 15, an inflation pipe 14 and a sleeve 5. The foldable airbags 7 are made of strong nylon material and are arranged between the outer wall of the cylindrical rod 3 and the inner wall of the sleeve 5. The structure can be kept intact under strong impact loads. The foldable airbag 7 is fixed by a fixing module 6 embedded in the groove 17 of the cylindrical rod 3. A separation spring is arranged in the groove 17 of the cylindrical rod 3. The electromagnet 13 is connected to the foldable airbag 7. The separation spring is compressed and embedded in the groove 17 under the suction of the electromagnet 13. After the magnetic force of the electromagnet 13 disappears, the separation spring pushes the fixing module 6 out of the groove 17 and separates it from the cylindrical rod 3. The fixing module is two pieces of magnetized ultra-high strength steel.

[0030] The inflation pipe 14 connects the gas generator 15 and the foldable airbag 7, passes through the fixed module 6, and connects the two sections of the inflation pipe; the sleeve 5 is arranged on the surface of the foldable airbag 7, and its two ends are stuck between the bottom surface of the disc cavitator 2 and the end surface of the navigation body 8, and the material is a polyester resin-based composite material.

[0031] The buffer module 9 is filled in the stepped hole of the navigation body 8 and is in contact with the chassis 4. The chassis 4 can move axially inside the navigation body 8. The buffer module 9 is made of a carbon fiber corrugated honeycomb structure.

[0032] The specific implementation process is as follows: the process of the navigation body entering the water at high speed can be divided into three stages: Stage 1: Figure 3 As shown, the disc cavitator 2 first touches the water, and under the axial force, it quickly shrinks into the navigation body 8 and compresses the sleeve 5. At this time, the sleeve 5 is crushed by pressure, and the disc cavitator 2 transmits the axial force to the chassis 4 through the cylindrical rod 3 and compresses the buffer module 9. The buffer module 9 is compressed to absorb energy. The pressure sensor 12 detects that the pressure signal reaches the set value and transmits the signal to the gas control device 16. Then the gas generator 15 acts to generate a large amount of high-temperature and high-pressure gas, which is inflated to the foldable airbag 7 through the inflation pipe 14; Stage 2: As shown in FIG. Figure 4 As shown, the sleeve 5 is completely broken under the action of the compression of the disc cavitator 2 and the inflation of the foldable airbag 7, and the foldable airbag 7 is fully unfolded and in contact with the liquid. At this moment, the fixing module 6 is stuck at the end surface of the disc cavitator 2 and the navigation body 8, which plays an axial limiting role on the load reduction rod 1. The load reduction rod 1 cannot be retracted, and the foldable airbag 7 can fully play its role; Stage three: as shown in FIG. Figure 6 As shown, the electromagnet 13 receives the control instruction of the gas control device 16 and cuts off the power, the fixing module 6 loses the magnetic attraction and becomes ineffective, the airbag 7 is in a ring shape and is affected by buoyancy, and the navigation body is affected by inertia and the two begin to separate, the load-reducing rod 1 continues to be compressed until the disc cavitator 2 contacts the front end surface of the navigation body 8, the buffer module 9 is compressed to the limit, and the navigation body enters the stable navigation stage.

[0033] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. An external airbag-type combined load-reducing device for high-speed water entry of a navigation body, characterized in that: include: The disc cavitator is used as the contact part of the navigation body contacting with the water when entering the water; A connecting rod, the two ends of which are respectively connected to the disc cavitator and the chassis, and are used to install the gas generating device, the control device and the electromagnet; A foldable airbag is arranged between the outer wall of the connecting rod and the sleeve, and can be inflated and expanded to reduce the load when the gas generating device is activated; A fixing module, used for connecting the foldable airbag, embedded in the connecting rod and directly provided with a separation module with the embedded connecting rod, and capable of limiting the position of the connecting rod after contraction; The electromagnet is used to attract the fixing module under the action of magnetic force, so that the fixing module is connected to the connecting rod, and in the case of power failure, the fixing module is separated from the connecting rod through the separation module to achieve the separation of the multiple foldable airbags in the inflated state; The sleeve is used to fix the foldable airbag, which is arranged between the disc cavitator and the end surface of the navigation body and can be broken under a certain pressure; The chassis is arranged in the navigation body, can move axially relative to the navigation body, and a buffer module is provided between the chassis and the navigation body for compression energy absorption; The pressure detection unit is used to monitor the water entry pressure of the disc cavitator. When the set value is reached, the control device controls the gas generating device and the electromagnet through timing, generates combustion gas through the gas generating device to inflate the foldable airbag, and controls the electromagnet to cut off power to achieve the separation of the foldable airbag in the inflated state.

2. The external airbag-type combined load-reducing device for high-speed water entry of a navigation body according to claim 1 is characterized in that: The fixing module is embedded in the groove of the connecting rod. A separation spring is provided in the groove of the connecting rod as the separation module. The separation spring is compressed and embedded in the groove under the action of the electromagnet suction force. After the magnetic force of the electromagnet disappears, the separation spring pushes the fixing module out of the groove and separates it from the connecting rod.

3. The external airbag-type combined load-reducing device for high-speed water entry of a navigation body according to claim 1 is characterized in that: The control device is connected to the electromagnet via a switch, and the switch is in a normally closed state.

4. The external airbag-type combined load-reducing device for high-speed water entry of a navigation body according to claim 1 is characterized in that: The gas generating device comprises a gas generator and an inflation pipe; the inflation pipe connects the gas generator and the foldable airbag.

5. The external airbag-type combined load-reducing device for high-speed water entry of a navigation body according to claim 1 is characterized in that: A pressure sensor is installed at the bottom of the disc cavitator as a pressure checking unit.

6. The external airbag-type combined load-reducing device for high-speed water entry of a navigation body according to claim 1 is characterized in that: The connecting rod is a cylindrical rod structure.

7. The external airbag-type combined load-reducing device for high-speed water entry of a navigation body according to claim 1 is characterized in that: The cylindrical rod and the chassis are connected via threads.

8. The external airbag combined load-reducing device for high-speed water entry of a navigation body according to any one of claims 1 to 7, characterized in that: The load reduction methods include: Stage 1: The disc cavitator touches the water first, and under the axial force, it quickly shrinks into the navigation body and compresses the sleeve. At this time, the sleeve is crushed by pressure, and the disc cavitator transmits the axial force to the chassis through the connecting rod and compresses the buffer module. The buffer module compresses and absorbs energy. The pressure detection unit detects that the pressure signal reaches the set value and transmits the signal to the control device to inflate the foldable airbag; Stage 2: The sleeve is completely crushed under the action of the compression of the disc cavitator and the inflation of the foldable airbag. The foldable airbag is fully unfolded and contacts the liquid. At this moment, the fixed module is stuck at the disc cavitator and the end face of the navigation body, which plays an axial limiting role on the disc cavitator; Stage 3: The control device controls the fixed module to lose its magnetic attraction and lose its function. The disc cavitator contacts the front end face of the navigation body, the buffer module is compressed to the limit, and the navigation body enters the stable navigation stage.

Images