Muzzle brake efficiency device

Abstract

The application discloses a muzzle brake and efficiency increasing device, a tubular body of the muzzle brake and efficiency increasing device is internally formed with a bullet channel, the outer circumferential side of the front end is uniformly distributed with a plurality of lugs corresponding to rotary sealing plates in the circumferential direction, and the rear end is fixedly connected with a muzzle brake or a barrel; a directional injection hole corresponding to the rotary sealing plate is formed in the side wall of the tubular body or the muzzle brake; the directional injection hole is used for providing a driving force for opening the rotary sealing plate; one rotary sealing plate is rotatably installed on each lug through a rotary pin shaft; an elastic damper is sleeved on each rotary pin shaft; the rotary sealing plate has a closed state of closing the bullet channel and an open state of opening the bullet channel. The muzzle brake and efficiency increasing device adopts gunpowder gas to realize self-adaptive opening of the rotary sealing plate during launching, can quickly and reliably close the muzzle, can cut off the gunpowder gas in front of the muzzle and impact the rotary sealing plate through directional flow guiding, and the effect of muzzle brake and efficiency increasing is maximally realized.

Description

Technical Field

[0001] The present invention relates to the technical field of artillery or firearm recoil reduction, and in particular to a muzzle recoil reduction and efficiency enhancement device. Background Art

[0002] A muzzle brake is a muzzle device installed at the front end of a gun or firearm barrel. It is mainly used in the field of firearms and artillery. When firing a projectile, it uses an oblique nozzle to deflect the gas flow backward to generate a reverse impulse or directly impact the front baffle to generate an impact recoil force in the direction of the muzzle to achieve the purpose of reducing recoil energy. Its significance is to reduce the impact force acting on personnel or gun mounts.

[0003] High recoil efficiency is a key indicator of muzzle brake effectiveness, as it directly reduces the speed of the recoil mechanism. Currently, muzzle brakes can be categorized into three types based on their structure and operating principle: impact-type, with a recoil efficiency of 60% or higher; reaction-type, with a recoil efficiency of less than 40%; and impact-reaction-type, with an efficiency somewhere in between.

[0004] Muzzle brakes are widely used due to their recoil advantages. Many literatures and patents focus on improving the recoil efficiency of muzzle brakes. A large number of parameter optimization studies have been carried out in terms of the shape and structural dimensions of the side holes of the muzzle brakes, the inclination angle and position dimensions of the impact baffles, and the diameter of the central bullet hole. As a result, the recoil efficiency has been improved to a certain extent compared with muzzle brakes with traditional structural forms. The recoil efficiency has increased by about 15% after comprehensive optimization. However, there is still a bottleneck in the recoil effect because the central bullet holes of the above-mentioned muzzle brakes are not closed during the launch process, and most of the gunpowder gas escapes forward from the muzzle and is not utilized for recoil.

[0005] The firing process of a gun approximately adheres to the law of conservation of momentum, primarily manifested in the fact that the sum of the momentum vectors of the gunpowder gases, the projectile, and the recoil portion connected to the barrel is zero. This means that the sum of the forward momentum of the projectile and the forward momentum of the gases escaping the muzzle equals the sum of the backward momentum of the recoil portion and the momentum of the gases deflected backward. This scientific discovery, based on the principle of conservation of momentum, suggests that by promptly closing the muzzle after the projectile exits the muzzle, intercepting the forward-escaping gunpowder gases and deflecting most of them backward or impacting the baffle as much as possible, muzzle brake efficiency will be significantly improved compared to a muzzle brake without a muzzle closure function. The specific magnitude of this improvement is related to comprehensive firing conditions such as the gun's caliber, internal ballistic performance, and muzzle pressure.

[0006] The prior art discloses a high-efficiency muzzle brake which comprises a brake pipe body fixedly arranged at a muzzle end, a fixed baffle arranged at an outer side end of the brake pipe body, a movable baffle cavity arranged outside the fixed baffle, a movable baffle arranged in the movable baffle cavity, and a driving device arranged on the upper side of the movable baffle and used for driving the movable baffle to deflect.

[0007] However, the high-efficiency muzzle brake has the following problems: the moment when the projectile exits the muzzle and the driving baffle closes the muzzle cannot be accurately determined, the response time of the motor driving and the time for the driving baffle to rotate and close the muzzle are long, the effect of using the gas flow to impact the muzzle closing plate to increase the recoil is not obvious because the gas flow pressure in the bore can be attenuated to the standard atmospheric pressure value within milliseconds after the projectile exits, and the driving load is very large because the baffle is subjected to the gas flow pressure (when the minimum bore pressure is estimated to be 60 MPa, the vertical force on the baffle is close to more than 100 tons), so a general small motor cannot drive the baffle to rotate. SUMMARY

[0008] To solve the above technical problems, the present application provides a muzzle recoil increasing device which cancels the driving motor, uses the propellant gas to realize the self-adaptive opening of the rotating baffle during firing, can quickly and reliably close the muzzle, can cut off the gas flow in front of the muzzle and impact the rotating baffle in a directional flow, maximizes the effect of muzzle recoil increasing, and further improves the recoil efficiency of the muzzle brake and eliminates the influence of muzzle shock wave and smoke on the projectile and the measurement of the initial velocity.

[0009] The present application adopts the following specific technical solutions:

[0010] A muzzle recoil increasing device comprises a tubular body, at least two rotating baffles, a rotating pin shaft, and an elastic damper.

[0011] The tubular body is internally formed with a projectile channel, the outer periphery of the front end is uniformly distributed with a plurality of lugs corresponding to the rotating baffles in a circumferential direction, and the rear end is used for fixedly connecting with a muzzle brake or a barrel; a directional jet hole corresponding to the rotating baffles is arranged in the sidewall of the tubular body or the muzzle brake; and the directional jet hole is used for directing and guiding the gas flow to provide a driving force for opening the rotating baffles.

[0012] A rotating sealing plate is rotatably mounted on each of the lug through the rotating pin shaft; the rotating sealing plate is provided with a plate-shaped end part opposite to the directional jet hole;

[0013] An elastic damper is sleeved on each of the rotating pin shafts;

[0014] The rotating sealing plate has a closed state for closing the bullet passage and an open state for opening the bullet passage;

[0015] In a natural state, the rotating sealing plate is attached to the front end surface of the tubular body under the damping force of the elastic damper and is in the closed state; when an external force is applied to the rotating sealing plate or the gas thrust of the directional jet hole sprayed to the plate-shaped end part is greater than the damping force of the elastic damper, the rotating sealing plate rotates around the rotating pin shaft into the open state; the rotating sealing plate realizes automatic opening by temporarily compressing the bullet front sealing space with bullet front dynamic pressure.

[0016] Further, an anti-disengagement pin shaft is further included;

[0017] One end of the rotating pin shaft is provided with a limiting hole penetrating in the radial direction thereof, and the other end is provided with an annular flange;

[0018] The anti-disengagement pin shaft is installed at the end of the rotating pin shaft by penetrating the limiting hole, for preventing the rotating sealing plate from disengaging from the lug.

[0019] Further, a long pin is further included;

[0020] Two first mounting holes for penetrating the rotating pin shaft and a first locking hole parallel to the first mounting hole are provided on each of the lugs;

[0021] A second mounting hole corresponding to the first mounting hole and a second locking hole corresponding to the first locking hole are provided on each of the rotating sealing plates;

[0022] The rotating pin shaft is penetrated in the first mounting hole and the second mounting hole, so that the rotating sealing plate is rotatably mounted on the lug;

[0023] The long pin is penetrated in the first locking hole and the second locking hole, for locking the rotating sealing plate on the lug.

[0024] Further, the first locking hole and the second locking hole are threaded holes;

[0025] The long pin is provided with external threads and is threadedly connected with the first locking hole and the second locking hole.

[0026] Further, a sealing gasket is further included;

[0027] The rotary sealing plate is provided with a sealing groove opposite to the front end surface of the tubular body;

[0028] The sealing gasket is installed in the sealing groove;

[0029] When the rotary sealing plate is in the closed state, the sealing gasket is sealed between the rotary sealing plate and the tubular body.

[0030] Further, the tubular body and the muzzle brake or the barrel are integrated.

[0031] Further, the tail end of the tubular body is provided with threads and is screwed with the muzzle brake.

[0032] Further, the elastic damper is a torsion spring, a coil spring or a disc spring.

[0033] Further, the opening torque M O and the closing torque M C of the A end of the rotary sealing plate need to meet the following conditions: M C ≥ M O .

[0034] Further, the rotary sealing plate further includes an arc-shaped sealing plate for abutting against the front end surface of the tubular body.

[0035] The inner side of the arc-shaped sealing plate is provided with a parting surface, and the size of the parting surface is obtained by removing the maximum projectile diameter part at the designed maximum opening angle position of the arc-shaped sealing plate.

[0036] The plate-shaped end portion is a flat plate or an arc-shaped plate.

[0037] Compared with the prior art, the muzzle brake efficiency increasing device has the following beneficial effects:

[0038] 1. Flexible arrangement, convenient maintenance and replacement.

[0039] The tubular body of the muzzle brake efficiency increasing device can exist in an independent form to complete the upgrading of the existing muzzle brake, and can also be integrated with any structure of the muzzle brake or the barrel, and is processed into an integrated body. In addition, the sealing plate is externally mounted, the space arrangement is flexible, and the installation, maintenance and replacement are more convenient, thereby reducing the use risk.

[0040] 2. Daily closure for protecting the muzzle and instantaneous automatic opening during shooting.

[0041] The daily closing barrel can guarantee the cleaning of the barrel, and the instantaneous automatic opening of the rotating sealing plate during the shooting process is not limited by the high-low shooting angle, the propellant and the bullet type, and the instantaneous automatic opening of the sealing plate can be realized, and the flexible fitting with the bullet shape can be realized, so that the bullet can pass smoothly at high speed.

[0042] 3. Reliable use, obvious recoil increasing effect.

[0043] The rotating sealing plate is subjected to the action of high-speed combustion gas of 800 m / s, and the opening speed is fast, and the closing barrel is timely under the action of the elastic damper, and the closing position is uniquely and reliably limited by the mechanical hard limit of the barrel end face, in addition, the directional jet hole and the rotating sealing plate form an impact type muzzle brake with high recoil efficiency, and the combustion gas is effectively blocked and recoiled, and the numerical calculation evaluates that the muzzle brake increasing effect can reach more than 25%, and the specific amplitude is related to the muzzle pressure under different shooting conditions. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a connection position relation diagram of the muzzle brake increasing efficiency device of the application;

[0045] Figure 2 It is an explosion structure diagram of the muzzle brake increasing efficiency device of the application;

[0046] Figure 3 It is an axial side half-sectional view of the rotating sealing plate in a natural state;

[0047] Figure 4 It is a rotating sealing plate in a fully open state and a combustion gas flow direction diagram;

[0048] Figure 5 It is a rotating sealing plate closing self-locking stress half-sectional view;

[0049] Figure 6 It is a structure diagram of the rotating sealing plate. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0051] The embodiment provides a muzzle brake increasing efficiency device 03, as shown in the structure, in the embodiment, the muzzle brake increasing efficiency device 03 is fixedly connected with one end of the muzzle brake 02, and the other end of the muzzle brake 02 is fixedly connected with the barrel 01. Figure 1 The structure shown in the embodiment, in the embodiment, the muzzle brake increasing efficiency device 03 is fixedly connected with one end of the muzzle brake 02, and the other end of the muzzle brake 02 is fixedly connected with the barrel 01.

[0052] like Figure 2 As shown, the muzzle recoil enhancement device includes a tubular body 1, two rotary sealing plates 2, a rotary pin 5, an elastic damper 4, an anti-dropout pin 6, a long pin 7 and a sealing gasket 3; in the present embodiment, the muzzle recoil enhancement device adopts a left-right completely axially symmetrical structure, and is described by taking a muzzle recoil enhancement device with two rotary sealing plates 2 as an example. In actual use, three, four or more rotary sealing plates 2 can also be provided, and the number of support ears, directional spray holes 11, rotary pin 5, anti-dropout pin 6, long pin 7 and sealing gasket 3 corresponds to the number of rotary sealing plates 2, that is, each rotary sealing plate 2 requires a support ear, a directional spray hole 11, a rotary pin 5, an anti-dropout pin 6, a long pin 7 and a sealing gasket 3, and multiple rotary sealing plates 2 are evenly distributed along the circumference of the tubular body; wherein:

[0053] The tubular body 1 is open at both ends, and a projectile channel is formed inside. Two support ears are symmetrically provided on both sides of the front end. Two directional spray holes 11 are provided on the middle side wall that penetrates the wall thickness. The rear end is fixedly connected to the muzzle brake 02, and can also be directly fixedly connected to the barrel 01; the tubular body 1 and the muzzle brake 02 or the barrel 01 can be made into an integral structure or a split structure; when the tubular body 1 and the muzzle brake 02 are a split structure, the tail end of the tubular body 1 is provided with a thread, and is threadedly connected to the muzzle brake 02 through the thread; the directional spray hole 11 is used to directional guide the gas to provide a driving force for opening the rotary seal plate 2; the directional spray hole 11 can be set at an angle.

[0054] A rotary sealing plate 2 is rotatably mounted on each support ear via a rotary pin 5; the two rotary sealing plates 2 are axially symmetrically distributed with the central axis of the tubular body 1 as the axis of symmetry; the rotary sealing plate 2 is provided with a plate-like end portion arranged opposite to the directional spray hole 11; the plate-like end portion can be composed of a flat plate or an arc-shaped plate.

[0055] An elastic damper 4 is sleeved on each rotary pin shaft 5, and the elastic damper 4 is used to ensure that the rotary sealing plate 2 always has a tendency to close the muzzle; the elastic damper 4 can be a torsion spring, a coil spring or a disc spring; the elastic damper 4 can also maintain the initial position and drive the rotary sealing plate to close after the projectile flies out of the muzzle through electromagnetic attraction.

[0056] like Figure 6 As shown, the rotary sealing plate 2 has a closed state for sealing the projectile passage and an open state for opening the projectile passage; Figure 3 As shown, in the natural state, the rotary sealing plate 2 is in contact with the front end surface of the tubular body 1 under the damping force of the elastic damper 4, and is in a closed state. The two rotary sealing plates 2 are butted together to close the chamber mouth; Figure 4As shown, when external force is applied to the rotary sealing plate 2 or the thrust of the gas sprayed from the directional nozzle 11 to the plate-shaped end is greater than the damping force of the elastic damper 4, the rotary sealing plate 2 rotates around the rotary pin 5 and enters the open state; the rotary sealing plate 2 uses the dynamic pressure in front of the bullet to instantaneously compress the closed space in front of the bullet to achieve automatic opening; the rotary sealing plate 2 includes an arc-shaped sealing plate for fitting with the front end surface of the tubular body 1 and a plate-shaped end for facing the directional nozzle 11; the arc-shaped sealing plate is provided with a parting surface 21, and the parting surface size is obtained by removing the maximum projectile diameter part at the designed maximum opening angle position of the arc-shaped sealing plate; the front end of the rotary sealing plate 2 is end A, and the rear end is end B, that is: the end of the rotary sealing plate 2 used to close the opening of the tubular body 1 is end A, and the end of the rotary sealing plate 2 opposite to the directional nozzle 11 is end B.

[0057] One end of the rotary pin 5 is provided with a limiting hole passing through it radially, and the other end is provided with an annular flange; the anti-slip pin 6 is installed on the end of the rotary pin 5 through the limiting hole to prevent the rotary sealing plate 2 from detaching from the support ear; the rotary pin 5 is used to realize the rotary pair connection between the tubular body 1 and the rotary sealing plate 2; the axial constraint of the rotary pin 5 is completed by the anti-slip pin 6.

[0058] Each support lug is provided with two first mounting holes for inserting the rotary pin 5 and a first locking hole arranged parallel to the first mounting holes; each rotary sealing plate 2 is provided with a second mounting hole corresponding one-to-one to the first mounting hole and a second locking hole corresponding to the first locking hole; the rotary pin 5 is inserted into the first mounting hole and the second mounting hole, so that the rotary sealing plate 2 is rotatably installed on the support lug; the long pin 7 is inserted into the first locking hole and the second locking hole, so as to lock the rotary sealing plate 2 to the support lug. The first locking hole and the second locking hole can both be threaded holes; the long pin 7 is provided with an external thread and is threadedly connected to the first locking hole and the second locking hole; the threaded connection between the long pin 7 and the locking hole can prevent the long pin 7 from falling.

[0059] The rotary sealing plate 2 is provided with a semi-annular sealing groove opposite the front end of the tubular body 1. A sealing gasket 3 is installed in the sealing groove. When the rotary sealing plate 2 is in the closed state, the sealing gasket 3 seals between the rotary sealing plate 2 and the tubular body 1. The sealing gasket 3 can be made of an ablation-resistant material such as polytetrafluoroethylene and is fixed to the sealing groove using high-temperature resistant adhesive.

[0060] After the shot is fired, the outer shape of the projectile 04 and the inner surface of the chamber form an instantaneous closed space. At the same time, before the projectile 04 hits the rotary sealing plate 2, the high-speed movement of the projectile 04 will generate a dynamic pressure of about 4 standard atmospheric pressures. The dynamic pressure is used to automatically and instantaneously complete the accompanying opening of the rotary sealing plate 2. After the projectile 04 breaks away from the flexible constraint of the rotary sealing plate 2, the gas flow is ejected from the directional nozzles 11 on both sides of the tubular body 1, completing the closing drive of the rotary sealing plate 2. At the same time, the force on the rotary sealing plate 2 just reaches dynamic balance, and it is always in a closed chamber state of dynamic balance during the attenuation of the gas in the chamber. During the whole process, the opening and closing of the rotary sealing plate 2 are automatically mechanically sensed by the movement of the position, and the rotary sealing plate 2 is in a closed and self-locking state during the attenuation. Another working mode is that during daily peek or rub operations, the rotary sealing plate 2 is opened by external force and rotated to a fixed position, and then the rotary sealing plate 2 is fixed to the tubular body 1 by the long pin 7. Before firing, be sure to withdraw the long pin 7 so that the rotary seal plate 2 is in its initial working position close to the muzzle. The functional design of the automatic opening, closing and closed self-locking of the rotary seal plate 2 above needs to be designed in accordance with the calculation steps in the specific implementation plan to meet the use requirements.

[0061] The above-mentioned muzzle recoil enhancement device utilizes the dynamic pressure in front of the projectile to instantaneously compress the closed space in front of the projectile, thereby realizing the principle of automatic opening of the rotary seal plate. The above-mentioned muzzle recoil enhancement device also utilizes the diversion and distribution of the gas to do work, thereby realizing the principle of automatic and timely closing of the rotary seal plate and being in a closed and self-locking state. At the same time, the conditions for the closed and self-locking of the rotary seal plate are only related to the structural dimensions of the directional nozzle that balances the rotational torque of the rotary seal plate, and have nothing to do with the pressure near the muzzle during the launch process. The external shape of the B end of the rotary seal plate is not limited to a flat plate, but can also be an arc or other shapes. The internal profile of the rotary seal plate is obtained by removing the maximum projectile diameter portion at the designed maximum opening angle of the seal plate. If the designed opening angle can completely clear the projectile channel, the parting surface may not be provided.

[0062] like Figure 5 As shown, the inner diameter of the muzzle is d, the outer diameter is D, the angle between the end A of the rotary sealing plate 2 and the center line of the muzzle is θ, the angle between the end B of the rotary sealing plate 2 and the center line of the muzzle is α, and the mass of a single sealing plate is m b , the gravity acceleration is g, the distance between its center of mass and the axis of the rotating pin 5 is l, and the horizontal distance between the center line of the directional nozzle 11 and the end face of the muzzle is L k , the diameter of the directional nozzle 11 is d k The angle between the axis of the directional nozzle 11 and the center line of the bore is β, and the distance between the cross section of the front cylindrical section of the projectile with a diameter of d and the projectile tip is L d .

[0063] With the muzzle center as the coordinate origin O, the projectile flight direction is the positive direction of the X axis, and the vertical X axis upward is the positive direction of the Y axis, then the coordinate of the center point of the rotary pin 5 is selected as O z(-x0, y0), and x0 ≥ 0, while rotating the sealing plate 2 to the initial angle Greater than the maximum opening angle In order to meet the requirement of non-interference of the turning structure of the rotary sealing plate 2.

[0064] 1. When the directional spray hole 11 is closed, the rotary sealing plate 2 automatically opens.

[0065] Assume that a closed space is formed immediately before the projectile tip hits the rotary sealing plate 2, then

[0066]

[0067] The dynamic pressure generated at the moment when the projectile hits the rotary sealing plate 2 is P v ,but:

[0068] P v =ρv0 2 / 2;

[0069] Among them, ρ is the air density, v0 is the initial velocity of the projectile;

[0070] Approximate calculation, the dynamic pressure P v Acting directly on the rotary sealing plate 2, its rotary arm L1 is:

[0071]

[0072] In order to ensure that the rotary sealing plate 2 is normally closed and the front end of the projectile is about to hit the rotary sealing plate 2, the initial torque M provided by the elastic damper 4 is required. t The following conditions are met:

[0073]

[0074] Within this range, a smaller value is preferred. Generally, by using external weighting, the center of mass of the rotary sealing plate 2 should be located above the axis of the rotary pin 5, so that the gravity moment of the rotary sealing plate 2 is reduced to 0. In addition, the selection of external dimensions is determined only by the size of the rotary pin 5 that meets the rigidity requirements, while also meeting the principle of minimizing the structural dimensions.

[0075] In summary, when L k 、M t When the above conditions are met at the same time, a closed space is formed between the projectile body and the rotating sealing plate 2 before the projectile tip hits the rotating sealing plate 2, the dynamic pressure before the projectile is sufficient to overcome the initial torque of the elastic damper 4, and before the projectile flies away from the rotating sealing plate 2, the A-end surface of the rotating sealing plate 2 flexibly and adaptively fits the projectile body.

[0076] 2. Under the action of gunpowder gas, the rotary sealing plate 2 is quickly closed and self-locked.

[0077] After the projectile flies away from the A end of the rotary seal plate 2, the gunpowder gas is blown from the directional nozzle 11 to the B end of the rotary seal plate 2, forming a torque arm L2:

[0078]

[0079] Since the distance between the directional spray hole 11 and the A end of the rotary sealing plate 2 is not much different, the pressure at the two locations is approximated by the average pressure in theoretical calculation, and both are p≤ the bottom pressure p d , then the opening torque M of the A end of the single-side rotary sealing plate 2 O and closing torque M at end B C for:

[0080]

[0081] Determine d k ,α,β values, to ensure that M C ≥M O , that is, the gas flow torque on the rotary sealing plate 2 must satisfy the requirement that the torque value generated at the directional nozzle hole is greater than the torque value generated at the muzzle end face.

[0082] The overall installation form of the above-mentioned muzzle brake enhancement device is: the tubular body 1 can be directly connected to the barrel 01 through a thread, or be connected to the barrel 01 through a transition of the muzzle brake 02, or be integrated with a muzzle brake 02 of any structural form such as impact type, reaction type and impact-reaction type, and be processed into one piece.

[0083] The position of the directional nozzle 11 in the above-mentioned muzzle brake efficiency enhancement device is: the directional nozzle 11 on both sides of the tubular body 1 is key to the directional conduction of the gas, which is used to provide the driving force for the rotation of the rotary seal plate 2. Its position can be set on the tubular body 1, or a side hole of the muzzle brake 02 can be used to complete the directional conduction.

[0084] Number of directional spray holes 11: The rotary sealing plate 2 is placed on the outside. The number of rotary sealing plates 2 is not limited to 2. Several rotary sealing plates may be arranged equidistantly along the circumferential direction of the muzzle, and the same number of directional spray holes 11 may be set accordingly. At the same time, the initial state of the rotary sealing plate 2 may also be either open or closed.

[0085] The opening angle and closed shape of the rotary sealing plate 2: The shape of the B end of the rotary sealing plate 2 is not limited to a flat plate, it can also be an arc or other shapes. The internal surface size of the rotary sealing plate 2 is obtained by removing the maximum projectile diameter part at the designed maximum opening angle position of the sealing plate. If the designed opening angle can completely make way for the projectile channel, the parting surface can also be omitted.

[0086] It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the spirit and scope of the application. Thus, it is intended that the present application cover the modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A muzzle brake efficiency enhancement device, characterized in that: It includes a tubular body, at least two rotary sealing plates, a rotary pin and an elastic damper; A projectile passage is formed inside the tubular body, and lugs corresponding to the rotary seal plates are evenly distributed along the circumference on the outer circumference of the front end, and the rear end is used to be fixedly connected to the muzzle brake; directional spray holes corresponding to the rotary seal plates are opened on the side walls of the tubular body or the muzzle brake; the directional spray holes are used to directional guide the gas to provide the driving force for closing the rotary seal plates; A rotary sealing plate is rotatably mounted on each of the support ears via the rotary pin shaft; the rotary sealing plate is provided with a plate-shaped end portion arranged opposite to the directional spray hole; An elastic damper is sleeved on each of the rotary pins; The rotary sealing plate has a closed state for sealing the projectile passage and an open state for opening the projectile passage; In a natural state, the rotary sealing plate is in contact with the front end surface of the tubular body under the damping force of the elastic damper and is in a closed state; when an external force is applied to the rotary sealing plate, the rotary sealing plate rotates around the rotary pin shaft and enters an open state; the rotary sealing plate automatically opens by instantaneously compressing the closed space in front of the spring using the dynamic pressure in front of the spring; The bore diameter is d , the front end of the rotary sealing plate is end A, and the rear end is end B; A The angle between the end and the center line of the bore is θ , the mass of a single sealing plate is m b , the gravitational acceleration is g The distance between its center of mass and the axis of the rotary pin is l The horizontal distance between the center line of the directional nozzle and the end face of the muzzle is L k , the diameter of the directional nozzle is d k The angle between the axis of the directional nozzle and the center line of the bore is β , the diameter of the cylindrical section at the front of the projectile is d The distance between the cross section and the bullet tip is L d , take the muzzle center as the coordinate origin O, the projectile flight direction is the positive direction of the X axis, the vertical X axis upward is the positive direction of the Y axis, then the coordinate of the center point of the rotary pin is selected as O z (- x 0, y 0), and x 0≥0; Assume that a closed space is formed immediately before the projectile tip hits the rotating sealing plate. ； The dynamic pressure generated at the moment when the projectile hits the rotating seal is P v ,but: P v = ρv 0 2 / 2； in, ρ is the air density, v 0 is the initial velocity of the projectile; Approximate calculation, considering the dynamic pressure P v Acting directly on the rotary sealing plate, its rotary force arm L 1 is: ； In order to ensure that the rotary seal is normally closed and the front end of the projectile is about to hit the rotary seal, the initial torque provided by the elastic damper is required. M t The following conditions must be met: ； Within this range, take the smaller value; through external counterweight, make the center of mass of the rotary sealing plate above the axis of the rotary pin shaft, so that the gravity moment of the rotary sealing plate is reduced to 0.

2. The muzzle brake enhancement device according to claim 1, characterized in that: Also includes an anti-drop pin shaft; One end of the rotary pin is provided with a limiting hole extending radially therethrough, and the other end is provided with an annular flange; The anti-slip pin passes through the limiting hole and is installed at the end of the rotary pin to prevent the rotary sealing plate from being detached from the support ear.

3. The muzzle brake enhancement device according to claim 2, characterized in that: Also includes long pins; Two first mounting holes for passing the swivel pin shaft and a first locking hole arranged parallel to the first mounting holes are provided on each of the support ears; A second mounting hole corresponding to each of the first mounting holes and a second locking hole corresponding to the first locking hole are provided on each of the rotary sealing plates; The rotary pin is inserted into the first mounting hole and the second mounting hole, so that the rotary sealing plate is rotatably mounted on the support ear; The long pin is inserted into the first locking hole and the second locking hole, and is used to lock the rotary sealing plate to the support ear.

4. The muzzle brake enhancement device according to claim 3, characterized in that: The first locking hole and the second locking hole are threaded holes; The long pin is provided with an external thread and is threadedly connected to the first locking hole and the second locking hole.

5. The muzzle brake enhancement device according to claim 1, characterized in that: Also includes a gasket; The rotary sealing plate is provided with a sealing groove opposite to the front end surface of the tubular body; The sealing gasket is installed in the sealing groove; When the rotary sealing plate is in a closed state, the sealing gasket is sealed between the rotary sealing plate and the tubular body.

6. The muzzle brake enhancement device according to claim 1, characterized in that: The tubular body and the muzzle brake are an integral structure.

7. The muzzle brake enhancement device according to claim 1, characterized in that: The tail end of the tubular body is provided with a thread and is threadedly connected to the muzzle brake via the thread.

8. The muzzle brake enhancement device according to claim 1, characterized in that: The elastic damper is a torsion spring, a coil spring or a disc spring.

9. The muzzle brake enhancement device according to any one of claims 1 to 8, characterized in that: The opening torque of the A end of the rotary sealing plate M O and closing torque at end B M C Need to meet: M C ≥ M O .

10. The muzzle brake enhancement device according to claim 9, characterized in that: The rotary sealing plate further comprises an arc-shaped sealing plate for fitting with the front end surface of the tubular body; A parting surface is provided on the inner side of the arc-shaped sealing plate, and the size of the parting surface is obtained by removing the maximum projectile diameter portion at the designed maximum opening angle position of the arc-shaped sealing plate; The plate-shaped end portion is a flat plate or an arc-shaped plate.

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