An embedded combined gas seal applied to equal-diameter barrel projectiles

Abstract

The application discloses an embedded combined gas sealing ring applied to an equal-diameter barrel, which is a combined structure, and the gas sealing structure thereof is composed of a gas sealing ring and a pushing ring from front to back. A groove is formed in the rear end surface of the gas sealing ring, and the cross section of the groove is trapezoidal; the cross section of the pushing ring is also trapezoidal, and the waist angles of the two trapezoidal cross sections are equal; the gas sealing ring is sleeved on the bottom of a projectile, and the two are tightly matched; the front end of the pushing ring is embedded in the groove of the gas sealing ring, and a gap exists between the front end surface of the pushing ring and the front end surface of the groove of the gas sealing ring; the rear end surface of the pushing ring is positioned through a ring-shaped bottom plate; and the gas sealing ring, the pushing ring and the projectile are fixedly connected through a plurality of bolts arranged on the ring-shaped bottom plate. The application solves the problem of in-bore gas sealing in an equal-diameter barrel gun.

Description

Technical Field

[0001] This invention belongs to the field of high-pressure dynamic sealing, specifically relating to an embedded combined air-sealing ring applied to projectiles with equal diameter barrels. Background Technology

[0002] Currently, most artillery gas-sealing mechanisms employ a cartridge belt structure. Cartridges are suitable for rifled artillery. Since the diameter of the rifled propellant chamber is slightly larger than the diameter of the firing barrel, the cartridge belt's outer diameter is typically made larger than both the projectile and the firing barrel diameter during design. During firing, the cartridge belt is forced into the rifling of the barrel, ensuring gas sealing while simultaneously causing the projectile to spin, thus enhancing axial stability.

[0003] For smoothbore guns with barrels of equal diameter, since the chamber diameter is the same as the barrel diameter, using a cartridge band structure for sealing would be unsuitable because the outer diameter of the cartridge band is larger than the inner diameter of the barrel, making projectile loading difficult. For smoothbore guns with equal diameter barrels, a common gas-sealing structure for projectiles is the gas-sealing groove: several annular grooves are machined on the outside of the projectile. During firing, the high-pressure gas passes through the grooves, expanding and forming vortices, slowing its speed and reducing the amount of propellant gas escaping, thus sealing the propellant gases. However, gas-sealing grooves cannot completely reduce gas leakage; therefore, a more effective sealing structure is needed. Summary of the Invention

[0004] This invention proposes an embedded combined gas-sealing ring for use with projectiles of equal diameter barrels, in order to solve the problem of ensuring good gas-sealing performance in smoothbore artillery with high chamber pressure and a single barrel diameter.

[0005] The technical solution for achieving this invention is as follows: an embedded combined air-sealing ring for projectiles with equal diameter barrels, comprising an air-sealing ring and a pusher ring from front to back; a groove is formed on the rear end face of the air-sealing ring, and the cross-section of the groove is trapezoidal; the cross-section of the pusher ring is also trapezoidal, and the waist angles of the two trapezoidal cross-sections are equal; the air-sealing ring is fitted onto the bottom of the projectile, and the two fit tightly together; the front end of the pusher ring is embedded in the groove of the air-sealing ring, and there is a gap between the front end face of the pusher ring and the front end face of the groove of the air-sealing ring; the rear end face of the pusher ring is positioned by an annular base plate; the air-sealing ring, the pusher ring, and the projectile are fixedly connected by several bolts on the annular base plate.

[0006] Compared with the prior art, the significant advantages of this invention are:

[0007] (1) In the combined gas-sealing structure of the present invention, the outer diameter of the gas-sealing ring is the same as the outer diameter of the projectile, while the outer diameter of the push ring is less than or equal to the outer diameter of the projectile. Therefore, it can be easily installed in a cannon with a smoothbore barrel of the same diameter and can ensure a good gas-sealing effect.

[0008] (2) The combined air-tight structure of the present invention includes an air-tight ring and a push ring. The cross-sectional shape of the push ring and the cross-sectional shape of the groove of the air-tight ring are both isosceles trapezoids, and the waist angles of the two trapezoids are equal. The rear end face of the push ring is subjected to the high-pressure gas in the barrel, and the front end of the push ring will be continuously squeezed into the groove of the air-tight ring, so that the outer wall of the air-tight ring expands outward in the radial direction until it is pressed against the inner wall of the tube, thereby achieving the air-tight effect.

[0009] (3) The area of ​​the rear end face of the push ring in the combined air-tight structure of the present invention is larger than the area of ​​the outer wall of the air-tight ring and the inner wall of the body tube. Therefore, the contact pressure between the outer wall of the air-tight ring and the inner wall of the body tube will be greater than the high pressure of the gas on the bottom surface of the push ring, so that the air-tight structure has a good sealing effect.

[0010] (4) The combined air-sealing structure of the present invention is embedded in the projectile, and the rear end face of the push ring is restricted within the rear end face of the projectile. Therefore, using this air-sealing structure will not cause the air-sealing structure to protrude from the bottom surface of the projectile. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0012] Figure 2 This is a cross-sectional view of the present invention.

[0013] Figure 3 This is a cross-sectional view of the combined air-sealing ring of the present invention.

[0014] Figure 4 This is a partial cross-sectional view of the present invention in the body tube. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0017] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0018] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible to those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0020] The following section will further introduce the specific implementation method, as well as the technical difficulties and inventive points of this invention, using this design example as an example.

[0021] Combination Figures 1-4 The present invention discloses an embedded combined gas-sealing ring for use with a constant-diameter barrel projectile, comprising a gas-sealing ring 3 and a pusher ring 4 from front to back. The rear end face of the gas-sealing ring 3 has a groove with a trapezoidal cross-section. The pusher ring 4 also has a trapezoidal cross-section, with equal waist angles on both trapezoidal sections. The gas-sealing ring 3 fits tightly around the bottom of the projectile 1. The front end of the pusher ring 4 is embedded in the groove of the gas-sealing ring 3, with a gap between the front end face of the pusher ring 4 and the front end face of the groove in the gas-sealing ring 3. The rear end face of the pusher ring 4 is positioned by an annular base plate 5. The gas-sealing ring 3, the pusher ring 4, and the projectile 1 are fixed together by bolts 2 on the annular base plate 5. After assembly, the entire assembly is inserted into a constant-diameter smoothbore barrel 6.

[0022] The annular base plate 5 has a limiting protrusion at the rear end of its outer circumference. The annular base plate 5 limits both the sealing ring 3 and the push ring 4. The outer diameter of the limiting protrusion of the annular base plate 5 must be smaller than the outer diameter of the push ring 4, so that the high-pressure gas in the chamber contacts the rear end face of the push ring 4 and pushes the push ring 4 into the groove of the sealing ring 3.

[0023] The outer diameter of the sealing ring 3 is the same as that of the projectile 1, and the outer diameter of the push ring 4 is less than or equal to that of the projectile 1. Therefore, this sealing structure is suitable for artillery with barrels of equal diameter.

[0024] Let the angle between the two sides of the trapezoidal cross-section of the air-sealing ring 3 and the push ring 4 be 2α, and establish the functional relationship:

[0025]

[0026] In the formula: R is the outer diameter of projectile 1; R c h is the distance between the centerline of the trapezoidal section of the groove on the air-sealing ring 3 and the centerline of the projectile 1. u The length of the upper base of the trapezoidal cross-section of the groove on the air-sealing ring 3; l u The height of the trapezoidal cross-section of the groove on the air-sealing ring 3.

[0027] Let the length of the upper base of the trapezoidal cross-section of push ring 4 be h. d Establish the functional relationship:

[0028] 2δc+h u <h d <h u +2l u tan(α)

[0029] In the formula: δ is the gap between the projectile 1 and the barrel 6; c is the length coefficient, which is taken as 1.5 to 3.

[0030] Let the height of the trapezoidal section of push ring 4 be l. d Establish the functional relationship:

[0031]

[0032] Let the height of the trapezoidal section of the groove on the air-sealing ring 3 be l. u Establish the functional relationship:

[0033]

[0034] In the formula: p is the gas pressure inside the barrel, and [σ] is the allowable stress of the sealing ring 3 material.

[0035] The physical quantities in the above functional relationship can be referred to Figure 4 The annotation.

[0036] Working principle:

[0037] When the projectile 1 with the gas-sealing structure is placed inside the barrel, during firing, when the high-pressure propellant gases in the chamber contact the pusher ring 4, the rear end face of the pusher ring 4 is subjected to gas pressure, and the front end of the pusher ring 4 moves into the groove of the gas-sealing ring 3. As the pusher ring 4 is continuously pushed into the groove of the gas-sealing ring 3, the outer wall surface of the gas-sealing ring 3 will expand radially outward until it is tightly fitted with the inner wall surface of the barrel 6. Since the rear end face area of ​​the pusher ring 4 is larger than the area of ​​the part where the outer wall surface of the gas-sealing ring 3 is tightly fitted with the inner wall surface of the barrel 6, the contact pressure between the outer wall surface of the gas-sealing ring 3 and the inner wall surface of the barrel 6 will be greater than the pressure of the high-pressure gases in the chamber. The high-pressure gases in the chamber are difficult to leak through the tightly fitted part between the gas-sealing ring 3 and the barrel 6, so that the combined gas-sealing mechanism has a good sealing effect.

Claims

1. An embedded composite gas-sealing ring for use with projectiles of equal diameter barrels, characterized in that: From front to back, there are a sealing ring (3) and a push ring (4); the rear end face of the sealing ring (3) has a groove, and the cross-section of the groove is trapezoidal; the cross-section of the push ring (4) is also trapezoidal, and the waist angles of the two trapezoidal cross-sections are equal; the sealing ring (3) is fitted on the bottom of the projectile (1), and the two fit tightly together; the front end of the push ring (4) is embedded in the groove of the sealing ring (3), and there is a gap between the front end face of the push ring (4) and the front end face of the groove of the sealing ring (3); the rear end face of the push ring (4) is positioned by the annular base plate (5); the sealing ring (3), the push ring (4) and the projectile (1) are fixedly connected by several bolts on the annular base plate (5); The outer diameter of the air-sealing ring (3) is equal to the outer diameter of the projectile (1), and the outer diameter of the push ring 3 is less than or equal to the outer diameter of the projectile (1); Let the included angle between the two sides of the trapezoidal cross section be . Establish the functional relationship: ， In the formula: R is the outer diameter of the projectile (1); R c h is the distance between the centerline of the trapezoidal section of the groove on the air-sealing ring (3) and the centerline of the projectile (1); u The length of the upper base of the trapezoidal cross-section of the groove on the air-sealing ring (3); l u The height of the trapezoidal cross section of the groove on the air-sealing ring (3) is given.

2. The embedded combined gas-sealing ring for projectiles with equal diameter barrels as described in claim 1, characterized in that: Let the length of the upper base of the trapezoidal cross-section of the push ring (4) be h. d Establish the functional relationship: ， In the formula: δ is the gap between the projectile (1) and the barrel (6); c is a constant term, which is 1.5~3.

3. The embedded combined gas-sealing ring for projectiles with equal diameter barrels as described in claim 2, characterized in that: Let the height of the trapezoidal section of the push ring (4) be l. d Establish the functional relationship: ， In the formula: R is the outer diameter of the projectile (1).

4. The embedded combined gas-sealing ring for projectiles with equal diameter barrels as described in claim 3, characterized in that: Let the height of the trapezoidal section of the groove on the air-sealing ring (3) be l. u Establish the functional relationship: ， In the formula: The pressure of the gas inside the barrel. The allowable stress of the material for the air-sealing ring (3) is given.

5. The embedded combined gas-sealing ring for projectiles with equal diameter barrels as described in claim 1, characterized in that: The annular base plate (5) has a limiting protrusion at the rear end of its circumferential outer wall. The annular base plate (5) limits both the air-sealing ring (3) and the push ring (4). The outer diameter of the limiting protrusion of the annular base plate (5) must be smaller than the outer diameter of the push ring (4), so that the high-pressure gas in the chamber contacts the bottom surface of the push ring (4) and pushes the push ring (4) into the groove of the air-sealing ring (3).

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