Electromagnetic propulsion system

Abstract

Disclosed in the present invention is an electromagnetic propulsion system, comprising: a launch coil assembly and a magazine. A through-going coil cavity is formed at the center of the launch coil assembly; the magazine is used for accommodating projectiles; the projectiles are ferromagnetic; the magazine is adjacent to the launch coil assembly; an opening is formed at the side of the magazine close to the launch coil assembly; one end of the coil cavity is communicated with the interior of the magazine by means of the opening; each projectile has a ready position in the magazine; when the projectile is in the ready position in the magazine, the projectile is coaxial with the coil cavity, and a magnetic field generated by the launch coil assembly imparts an initial velocity to the stationary projectile in the ready position, such that the projectile passes through the opening and enters the coil cavity to be launched.

Description

Electromagnetic propulsion system TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic drive, in particular to an electromagnetic propulsion system. BACKGROUND

[0002] In the prior art, the projectile to be launched needs to first reach the barrel mouth, and then the projectile is given a thrust by other structures such as a push rod assembly, so that the projectile is displaced to drill into the effective acceleration area in the inner cavity of the launch coil, and then the projectile is accelerated and launched. In this way, the projectile cannot meet the optimal triggering conditions in the initial state, which affects the efficiency of launching, and components for applying force in the horizontal direction to make the projectile enter the launch area cannot be omitted.

[0003] The prior art CN211205046U discloses an electromagnetic projectile feeding device, which applies a thrust to the projectile by a power mechanism to make the projectile reach a position to be fired and wait for firing. The design of the power mechanism increases the complexity of the device, affects the launching efficiency, and is prone to failure.

[0004] The prior art CN106546127A discloses an open-loop electromagnetic launching device, which includes a launching device body in a cylindrical shape, and an opening is arranged on the circumferential wall of the launching device body along the axial direction, and the cross section of the opening is a sector, which is used for loading a projectile or a driving projectile into the inner cavity of the launching device body. The opening coil in this scheme may have problems such as low efficiency and large energy loss.

[0005] In view of the above technical problems, the present application is proposed.

[0006] SUMMARY

[0007] The main purpose of the present application is to provide an electromagnetic propulsion system to solve the problem that the projectile meets the launch condition in the initial state.

[0008] In order to achieve the above purpose, the present application provides an electromagnetic propulsion system, which comprises a launch coil assembly and a cartridge, the launch coil assembly has a coil cavity penetrating through the center, the cartridge is used for accommodating a projectile, the projectile has ferromagnetic property, the cartridge is adjacent to the launch coil assembly, the cartridge is provided with an opening on the side close to the launch coil assembly, and one end of the coil cavity is communicated with the inside of the cartridge through the opening.

[0009] The projectile has a preparation position in the cartridge, when the projectile is in the preparation position in the cartridge, the projectile is coaxial with the coil cavity, the magnetic field generated by the launch coil assembly can make the projectile in the preparation position obtain an initial speed from the static state, so that the projectile enters the coil cavity through the opening to be launched.

[0010] Further, the first coil and the coil skeleton are arranged at one end of the cartridge, the first coil is wrapped around the coil skeleton, the coil skeleton has a coil skeleton cavity, the coil skeleton cavity constitutes a coil cavity at one end of the cartridge, the bullet is located outside the coil skeleton cavity when the bullet is in the preparation position, and the magnetic field generated by the first coil enables the bullet to obtain an initial speed.

[0011] Further, when the bullet is in the preparation position, the distance d between the bullet head and the first coil in the axial direction of the bullet is in the range of 0.5-5 mm.

[0012] Further, the coil skeleton comprises a cylindrical portion and a side plate portion connected to each other, the center of the cylindrical portion forms the coil skeleton cavity, the side plate portion is located on the outer side of the cylindrical portion in the circumferential direction and extends in the direction perpendicular to the axis of the coil skeleton cavity, the first coil is in contact with both the cylindrical portion and the side plate portion, and when the bullet is in the preparation position, the distance d between the bullet head and the first coil and the minimum thickness t of the side plate portion satisfy t≤d<t+1 mm.

[0013] Further, the side plate portion has a uniform thickness, and the thickness t of the side plate portion is in the range of 1-4 mm.

[0014] Further, the inner diameter of the coil skeleton cavity at the side close to the cartridge is b1, the inner diameter of the coil skeleton cavity at the side away from the cartridge is b2, b1>b2, and the change in the inner diameter of the coil skeleton cavity is a smooth transition.

[0015] Further, the relationship between b1, b2 and the maximum diameter a of the bullet satisfies the following relationship: a+0.05 mm≤b1≤a+0.4 mm, and a+0.2 mm≤b2≤a+4 mm.

[0016] Further, the wall surface of the coil skeleton cavity has one or a combination of the following materials: polyoxymethylene, polyamide and polyether ether ketone.

[0017] Further, a spring is arranged in the cartridge, the cartridge can accommodate a plurality of bullets, the preparation position in the cartridge is located at the inner top of the cartridge, the plurality of bullets are arranged in the vertical direction above the spring, and when the cartridge retains the bullets, the relationship between the spring force F of the spring and the total mass M of the bullets retained in the cartridge satisfies F≥1.1 Mg.

[0018] Further, an arc-shaped slope is arranged on the inner top wall surface of the cartridge away from the opening, the arc-shaped slope is matched with the shape of the tail of the bullet, and the arc-shaped slope enables the bullet in the preparation position to be closer to the launch coil assembly than the bullets in other positions.

[0019] The technical scheme of the application at least achieves the following beneficial effects:

[0020] 1. The electromagnetic propulsion system of the present application, by designing the connection combination between the cartridge and the launch coil assembly, makes the preparation position of the projectile in the cartridge meet the launch conditions, without other mechanisms to exert force on the projectile to make it obtain initial velocity from the static state to reach the launch area, thereby eliminating the component that gives the projectile horizontal force to enter the optimal launch area, reducing the complexity of the system.

[0021] 2. The electromagnetic propulsion system of the present application, by further designing the distance between the projectile and the first coil, the thickness of the side plate, etc., ensures that the projectile can be attracted into the coil cavity by the magnetic attraction of the first coil and reach the optimal launch area without affecting the efficiency of the launch coil assembly, improving the launch efficiency.

[0022] 3. The electromagnetic propulsion system of the present application, by designing the change of the inner diameter of the coil skeleton cavity, when the trajectory of the projectile deviates, it can also correct the trajectory direction under the guidance of the special structure in the coil skeleton cavity, and smoothly enter the launch cylinder.

[0023] 4. The electromagnetic propulsion system of the present application, by designing the structure in the cartridge and the spring parameters, the force of the top end of the cartridge on the projectile in the preparation position is as small as possible under various conditions, thereby reducing the resistance of the projectile and ensuring the launch efficiency.

[0024] 5. The electromagnetic propulsion system of the present application, by designing the wall of the coil skeleton cavity with special materials, the coil skeleton cavity has high strength, high temperature resistance and self-lubricating effect, so that the electromagnetic propulsion system has stable performance, long service life and ensures high efficiency and continuous ammunition supply.

[0025] 6. The electromagnetic propulsion system of the present application, by designing the arc slope of the top of the cartridge and the slope of the opening, the projectile can further reach a position closer to the first coil through structural design to meet the better distance parameters between the projectile and the first coil. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 shows a schematic diagram of an electromagnetic propulsion system of an embodiment;

[0028] Figure 2 shows a front view of an electromagnetic propulsion system of an embodiment;

[0029] Figure 3 shows a schematic diagram of a cartridge and multiple projectiles of an embodiment;

[0030] Figure 4 shows a schematic diagram of the position of the first coil, the projectile and the spring of an embodiment.

[0031] Wherein, the above-mentioned drawings include the following reference signs: 1, a launch coil assembly; 2, a magazine; 3, a first coil; 4, a coil skeleton; 5, a bullet; 6, a coil skeleton cavity; 7, a side plate part; 8, a cylindrical part; 9, a spring; 10, an arc slope; 11, a first inclined surface part; 12, a second inclined surface part; 13, a launch cylinder. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0033] The present application will be further described in detail below in combination with specific embodiments, which cannot be understood as limiting the scope of the present application. The term “comprising” indicates the presence of a feature when used, but does not exclude the presence or addition of one or more other features; the terms “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; in addition, the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In the description, it should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting” should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, the meaning of “multiple” is two or more.

[0035] Embodiment:

[0036] The present embodiment proposes an electromagnetic propulsion system, as shown in FIG. 1, which includes a launch coil assembly 1 and a magazine 2, the launch coil assembly 1 has a coil cavity through the center, and the magazine 2 is used to accommodate the bullet 5.

[0037] The magazine 2 is adjacent to the launch coil assembly 1, and the magazine 2 is provided with an opening on the side close to the launch coil assembly 1, and one end of the coil cavity is communicated with the inside of the magazine 2 through the opening. There is an optimal launch area in the coil cavity, the bullet 5 is a ferromagnetic bullet, and the bullet 5 in the magazine 2 enters the optimal launch area in the coil cavity, and is pushed out by the electromagnetic force generated by the launch coil assembly 1.

[0038] In the present application, the projectile 5 has a ready position in the magazine 2, when the projectile 5 is in the ready position in the magazine 2, the projectile 5 is coaxial with the coil cavity. The magnetic field generated by the launch coil assembly 1 can make the projectile 5 in the ready position obtain an initial speed from the static state, so that the projectile 5 enters the optimal launch area in the coil cavity through the opening to be launched.

[0039] This design makes the ready position of the projectile in the magazine meet the launch condition, and other mechanisms are not needed to apply force to the projectile to make it obtain an initial speed from the static state to reach the launch area, thereby eliminating the component that gives the projectile a horizontal force to enter the optimal launch area, and reducing the complexity of the system.

[0040] Specifically, as shown in FIGS. 1 and 2, the launch coil assembly 1 near one end of the magazine 2 includes a first coil 3 and a coil skeleton 4, and the first coil 3 is wrapped around the coil skeleton 4. The coil skeleton 4 has a coil skeleton cavity 6, which constitutes one end of the coil cavity. When the projectile 5 is in the ready position, it is located outside the coil skeleton cavity 6. By designing the distance between the projectile 5 and the first coil 3 at this time, the attractive force generated by the first coil 3 on the projectile 5 makes the projectile 5 obtain an initial speed to enter the coil skeleton cavity 6. Preferably, when the projectile 5 is in the ready position, the distance d between the bullet of the projectile 5 and the first coil 3 in the axial direction of the projectile 5 is in the range of 0.5-5 mm.

[0041] Preferably, the launch coil assembly 1 further includes a plurality of launch coils and a launch cylinder 13, and the launch cylinder 13 is connected to the side of the coil skeleton 4 away from the magazine 2, and the plurality of launch coils are wrapped around the outer side of the launch cylinder 13 in the circumferential direction. The inner wall of the launch cylinder 13 forms a launch cylinder cavity, thereby constituting the other end of the coil cavity away from the magazine 2. After the projectile 5 enters the coil skeleton cavity 6, it is further accelerated by the plurality of launch coils and is launched from the launch cylinder 13.

[0042] Preferably, the coil skeleton 4 includes a cylindrical portion 8 and a side plate portion 7 connected to each other, the center of the cylindrical portion 8 forms the coil skeleton cavity 6, and the side plate portion 7 is located on the outer side of the cylindrical portion 8 in the circumferential direction and extends in a direction perpendicular to the axis of the coil skeleton cavity 6. The first coil 3 is in contact with both the cylindrical portion 8 and the side plate portion 7. The thickness of the side plate portion 7 can be non-uniform, and when the projectile 5 is in the ready position, the distance d between the bullet of the projectile 5 and the first coil 3 and the minimum thickness t of the side plate portion 7 satisfy the following condition: t≤d<t+1 mm. That is, the bullet end of the projectile 5 can be in the same plane as the outer wall surface of the thinnest part of the side plate portion 7, or within 1 mm of the outer wall surface.

[0043] In other embodiments, the coil frame 4 and the side plate portion 7 can also be designed in other shapes and structures, allowing the bullet head to extend into the cavity formed by the side plate portion 7. The distance d between the bullet head and the first coil 3 is slightly smaller than the thickness t of the side plate portion 7. By further designing the distance between the bullet and the first coil, the thickness of the side plate portion, and other parameters, it is ensured that the bullet can be attracted into the coil cavity by the magnetic force of the first coil and reach the optimal launch area, without affecting the efficiency of the launch coil assembly, thereby improving the launch efficiency.

[0044] Preferably, the side plate portion 7 has a uniform thickness t, and the thickness t of the side plate portion 7 is in the range of 1mm to 4mm, and further preferably 2mm. The diameter a of the bullet 5 is selected in the range of 9mm to 15mm, and preferably in the range of 11mm to 13mm, and most preferably 11.8mm. The distance d between the bullet head and the first coil 3 is preferably in the range of 2mm to 3mm.

[0045] As shown in FIG. 1 and FIG. 2, the inner diameter of the coil frame cavity 6 near the side of the magazine 2 is b1, and the inner diameter of the coil frame cavity 6 away from the side of the magazine 2 is b2, b1>b2, and the inner diameter of the coil frame cavity 6 changes smoothly. Preferably, the coil frame cavity 6 is designed to be trumpet-shaped. When the trajectory of the bullet deviates, it can also be corrected under the guidance of the special structure in the coil frame cavity and smoothly enter the launch barrel.

[0046] Further preferably, the relationship between b1, b2 and the maximum diameter a of the bullet 5 satisfies the following relationship: a+0.05mm≤b1≤a+0.4mm, a+0.2mm≤b2≤a+4mm

[0047] In this embodiment, when the diameter of the bullet 5 is most preferably 11.8mm, then 12mm<b1≤12.2mm, and 11.9mm≤b2≤12.1mm. The inner wall diameter of the launch barrel 13 is 12mm.

[0048] Preferably, the wall surface of the coil frame cavity 6 is made of one or a combination of the following materials: polyformaldehyde, polyamide, polyether ether ketone. The material of the bullet 5 is iron, and the outer surface of the bullet 5 is plated with chromium or nickel, and the surface roughness Ra of the bullet 5 is less than 6.3 microns.

[0049] The wall surface of the coil frame cavity is made of special materials, which has the effects of high strength, high temperature resistance, and self-lubrication, so that the electromagnetic propulsion system has stable performance, long service life, and ensures high efficiency and continuous ammunition supply. The material design of the bullet further improves the above effects.

[0050] As shown in FIG. 3 and FIG. 4, the spring 9 is arranged in the cartridge 2, and the ready position in the cartridge 2 is located at the inner top of the cartridge 2, and the spring 9 provides the elastic force to the bullet 5 in the cartridge 2.

[0051] Preferably, the cartridge 2 can accommodate a plurality of bullets 5, the plurality of bullets 5 are arranged in the vertical direction above the spring 9, and the central axes of the plurality of bullets are in the same plane as the axis of the coil framework cavity.

[0052] Preferably, by designing the spring parameters, when the cartridge 2 retains the bullet 5, the relationship between the elastic force F of the spring 9 and the total mass M of the bullet 5 retained in the cartridge 2 is F≥1.1Mg. This makes the bullet in the ready position receive the force from the top of the cartridge as small as possible in various cases, thereby reducing the resistance received by the bullet and ensuring the launching efficiency.

[0053] The elastic coefficient k of the spring 9 can be selected in the range of 38-96 N / m. Preferably, the spring 9 with the elastic coefficient k of 48-60 N / m is selected, and the specific calculation process is as follows: in the embodiment, the launching frequency is selected as 600 shots per minute, the single bullet is about 20 g, the diameter of the bullet is about 12 mm, and when the last bullet in the launching cartridge is launched, the bullet needs to rise by 12 mm in 0.1 second, and according to the formula, the rising acceleration a of the bullet is greater than 2.4 m / s 2 . Therefore, the elastic force F of the spring needs to be greater than 0.048 N. In the environment without considering gravity and jolt, the elastic coefficient k of the spring is at least 8 N / m, and in the environment considering gravity acceleration and jolt, the elastic coefficient k of the spring is at least 48 N / m.

[0054] Preferably, as shown in FIG. 2, the inner top wall of the cartridge 2 away from the opening side is provided with an arc-shaped slope 10, the arc-shaped slope 10 is matched with the tail shape of the bullet 5, and the arc-shaped slope 10 makes the bullet 5 in the ready position closer to the launching coil assembly 1 than the bullet 5 in other positions.

[0055] Preferably, as shown in FIG. 1, the first inclined surface 11 is arranged below the opening of the cartridge 2, the lower edge of the side plate 7 is provided with the second inclined surface 12, and the first inclined surface 11 and the second inclined surface 12 are matched with each other.

[0056] The electromagnetic propulsion system of the present application cooperates the arc-shaped slope of the inner top of the cartridge and the inclined surface of the opening, and through the structural design, the bullet can further reach a position closer to the first coil, so as to meet the better distance parameter between the bullet and the first coil.

[0057] In summary, from the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0058] 1. The electromagnetic propulsion system of the present application combines the connection between the cartridge and the launch coil assembly, so that the bullet in the preparation position in the cartridge can meet the launch condition, without other mechanism to force the bullet to obtain initial speed from the static state to reach the launch area, thereby saving the component that gives the bullet horizontal force to enter the optimal launch area, reducing the complexity of the system.

[0059] 2. The electromagnetic propulsion system of the present application further designs the distance between the bullet and the first coil, the thickness of the side plate, etc. to ensure that the bullet can be attracted into the coil cavity by the magnetic force of the first coil and reach the optimal launch area without affecting the efficiency of the launch coil assembly, improving the launch efficiency.

[0060] 3. The electromagnetic propulsion system of the present application designs the change of the inner diameter of the coil skeleton cavity, so that when the trajectory of the bullet deviates, it can also correct the trajectory direction under the guidance of the special structure in the coil skeleton cavity and smoothly enter the launch barrel.

[0061] 4. The electromagnetic propulsion system of the present application designs the structure in the cartridge and the spring parameters, so that the bullet in the preparation position receives the force from the top end of the cartridge as small as possible under various conditions, thereby reducing the resistance of the bullet and ensuring the launch efficiency.

[0062] 5. The electromagnetic propulsion system of the present application designs the wall of the coil skeleton cavity with special materials, so that the coil skeleton cavity has high strength, high temperature resistance and self-lubricating effect, making the electromagnetic propulsion system stable in performance, long in service life and ensuring high efficiency and continuous ammunition supply.

[0063] 6. The electromagnetic propulsion system of the present application designs the arc slope on the top of the cartridge and the slope at the opening, so that the bullet can further reach a position closer to the first coil through structural design to meet the better distance parameter between the bullet and the first coil.

[0064] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An electromagnetic propulsion system comprising a launching coil assembly (1) having a coil cavity through the center thereof and a cartridge (2) for accommodating a projectile (5) having ferromagnetic property in the cartridge (2), characterized in that: the cartridge (2) is adjacent to the launching coil assembly (1), and the cartridge (2) is provided with an opening on the side close to the launching coil assembly (1), and one end of the coil cavity communicates with the inside of the cartridge (2) through the opening; the projectile (5) has a preparation position in the cartridge (2), and when the projectile (5) is in the preparation position in the cartridge (2), the projectile (5) is coaxial with the coil cavity, and the magnetic field generated by the launching coil assembly (1) can make the projectile (5) in the preparation position obtain an initial velocity from a static state, so that the projectile (5) enters the coil cavity through the opening to be launched. the launching coil assembly (1) comprises a first coil (3) and a coil former (4) at one end close to the cartridge (2), the first coil (3) is wrapped on the coil former (4), the coil former (4) has a coil former cavity (6) thereon, the coil former cavity (6) constitutes one end of the coil cavity close to the cartridge (2), and the projectile (5) is located outside the coil former cavity (6) when the projectile (5) is in the preparation position, and the magnetic field generated by the first coil (3) makes the projectile (5) obtain an initial velocity. When the projectile (5) is in the preparation position, the distance d between the bullet of the projectile (5) and the first coil (3) in the axial direction of the projectile (5) is in the range of 0.5-5mm.

2. The electromagnetic propulsion system of claim 1, wherein: The coil former (4) comprises a cylindrical portion (8) and a side plate portion (7) connected to each other, the center of the cylindrical portion (8) forms the coil former cavity (6), the side plate portion (7) is located on the circumferential outside of the cylindrical portion (8) and extends in a direction perpendicular to the axis of the coil former cavity (6), the first coil (3) is in contact with both the cylindrical portion (8) and the side plate portion (7), and when the projectile (5) is in the preparation position, the distance d between the bullet of the projectile (5) and the first coil (3) and the minimum thickness t of the side plate portion (7) satisfy the relationship t≤d<t+1mm.

3. The electromagnetic propulsion system of claim 2, wherein: The side plate portion (7) has a uniform thickness, and the thickness t of the side plate portion (7) is in the range of 1-4mm.

4. The electromagnetic propulsion system of claim 3, wherein: The inner diameter of the coil former cavity (6) close to the cartridge (2) is b1, and the inner diameter of the coil former cavity (6) away from the cartridge (2) is b2, b1>b2, and the change of the inner diameter of the coil former cavity (6) is smooth transition.

5. The electromagnetic propulsion system of claim 4, wherein: The relationship between b1, b2 and the maximum diameter a of the projectile (5) satisfies the following relationship: a+0.05mm≤b1≤a+0.4mm, a+0.2mm≤b2≤a+4mm.

6. The electromagnetic propulsion system of any one of claims 2-5, wherein: ​ 7. The electromagnetic propulsion system of claim 6, wherein: ​ 8. The electromagnetic propulsion system of any one of claims 2-7, wherein: The wall of the coil former cavity (6) is made of one or a combination of the following materials: polyoxymethylene, polyamide, polyether ether ketone.

9. The electromagnetic propulsion system of any one of claims 1-8, wherein: A spring (9) is arranged in the cartridge (2), the cartridge (2) can contain a plurality of the bullet body (5), the preparation position in the cartridge (2) is located at the inner top of the cartridge (2), a plurality of the bullet body (5) are arranged in the vertical direction above the spring (9), when the cartridge (2) contains the bullet body (5), the relationship between the spring force F of the spring (9) and the total mass M of the bullet body (5) in the cartridge (2) is F≥1.1Mg.

10. The electromagnetic propulsion system of claim 9, wherein: The inner top wall of the cartridge (2) is provided with an arc-shaped slope (10) away from the opening side, the arc-shaped slope (10) is matched with the tail shape of the bullet body (5), and the arc-shaped slope (10) makes the bullet body (5) in the preparation position closer to the launch coil assembly (1) than the bullet body (5) in other positions.

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