A barrel chamber structure that makes the extraction resistance of long and short cartridge cases converge.

Abstract

This utility model relates to the field of barrel technology, specifically disclosing a barrel chamber structure that makes the extraction resistance of long and short cartridge cases more similar. This utility model adds several groove-shaped structures evenly distributed around the barrel axis to the inner wall of the original barrel chamber. The edges of the grooves are rounded to reduce stress concentration in the barrel. The starting end of the groove is located at the bevel of the chamber, extending beyond the front end of the long cartridge case, while the ending end is located at the front end of the short cartridge case within the chamber body. Compared with existing technologies, this design makes the extraction resistance of long and short cartridge cases more similar, resulting in similar extraction resistance after firing, improved extraction consistency, and a more consistent trajectory of the extracted cartridge case, thus achieving stable extraction in artillery.

Description

Technical Field

[0001] This utility model relates to the field of cartridge technology, specifically disclosing a cartridge chamber structure that makes the extraction resistance of long and short cartridges approach the same. Background Technology

[0002] The propellant chamber is the space where the propellant is placed and ensured to burn. The structure of the chamber depends on the loading method of the projectile, while its dimensions depend on the external dimensions of the propellant cartridge case. Most existing ammunition uses long metal cartridge cases, and the chamber design is able to meet the loading and extraction requirements of these long cartridge cases.

[0003] With the development of new semi-combustible cartridge (hereinafter referred to as short cartridge) ammunition, new equipment needs to be capable of firing both long and short cartridge ammunition. When using existing equipment to fire both long and short cartridge ammunition, on the one hand, after firing, the long and short cartridges expand and plastically deform under the action of high-temperature and high-pressure propellant gases, tightly adhering to the inner wall of the barrel. This results in a large compressive contact force between the cartridge and the inner wall, creating friction, i.e., extraction resistance. The contact area between the long and short cartridges and the inner wall differs significantly, leading to a large difference in extraction resistance. On the other hand, because the short cartridge is semi-combustible, after firing, incomplete combustion of the combustible portion leaves residue on the inner wall of the barrel. This residue has a certain stickiness. When firing a long cartridge after firing a short cartridge, the long cartridge, under the combined action of high-temperature and high-pressure propellant gases and residue, becomes "bonded" to the inner wall, generating even greater extraction resistance. When two types of ammunition, one with a long cartridge and the other with a short cartridge, are fired alternately, the combined effect of the two factors mentioned above results in a huge difference in extraction resistance between the long and short cartridges, leading to an unstable extraction state.

[0004] Therefore, it is necessary to design a barrel chamber structure that makes the extraction resistance of long and short cartridge cases similar, in order to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies and the problem of unstable extraction caused by the significant difference in extraction resistance resulting from the alternating use of long and short cartridge cases during artillery firing, a barrel chamber structure is proposed that brings the extraction resistance of long and short cartridge cases closer together.

[0006] This utility model is achieved through the following technical solution:

[0007] A barrel chamber structure that makes the extraction resistance of long and short cartridge cases similar includes a barrel 2, which has a hollow cartridge chamber. The inner wall of the barrel chamber has several evenly distributed groove-shaped structures 2-1, and the inner edges of the groove-shaped structures 2-1 are rounded to reduce stress concentration in the barrel. The starting end of the groove is located at the bevel of the cartridge chamber, and the starting position extends beyond the front end of the long cartridge case 1-1 used with it. The ending end of the groove is located at the body of the cartridge chamber, near the front end of the short cartridge case 1-2 used with it.

[0008] Preferably, the groove structure 2-1 has six grooves evenly distributed around the axis of the medicine chamber of the tube, with an interval of 60°.

[0009] Preferably, the distance from the starting position of the groove to the starting position of the rifling of the barrel 2 is a, where a is greater than 0 and less than the distance from the end face of the mouth of the long cartridge 1-1 to the starting position of the rifling of the barrel.

[0010] Preferably, the distance from the end of the groove to the end face of the short cartridge 1-2 is b, and the value of b is within ±20mm.

[0011] Furthermore, the value of b is 0.

[0012] Preferably, the short cartridges 1-2 are semi-flammable cartridges.

[0013] The principle of this invention is as follows: When this structure is adopted, when the artillery fires a long-cartridge projectile, part of the generated high-speed, high-pressure propellant gas acts on the inner wall of the cartridge case, causing it to expand and deform outwards. The other part enters the evenly distributed grooved structure on the inner wall of the barrel's propellant chamber, generating a uniform counter-expansion force around the barrel's axis on the outer wall of the cartridge case, reducing the compressive contact force with the inner wall of the barrel. Simultaneously, because the pressure drop of the propellant gas inside the cartridge case after the shell leaves the barrel is faster than the pressure drop of the propellant gas entering the grooved structure, a pressure difference is generated on the inner and outer sides of the cartridge case wall, causing a certain degree of contraction. These processes reduce the extraction resistance of the long cartridge case. When firing a short-cartridge projectile, since it is a semi-combustible cartridge case, the non-combustible part of the cartridge case does not contact the grooved structure on the inner wall of the barrel's propellant chamber, and the extraction resistance is no different from that under the original barrel's propellant chamber structure. Therefore, by adding a grooved structure to the inner wall of the barrel's propellant chamber and optimizing the relevant structural parameters, the difference in extraction resistance between long and short cartridge cases can be reduced and brought to converge.

[0014] The beneficial effects of this utility model are reflected in:

[0015] Compared with the prior art, this utility model can make the extraction resistance of long and short cartridge cases more similar, thus making the extraction resistance of long and short cartridge cases similar after firing, improving the consistency of extraction state, ensuring that the movement trajectory of the cartridge case after extraction is similar and consistent, and achieving the effect of stable extraction of artillery cartridge cases. Attached Figure Description

[0016] Figure 1 This is a partial structural diagram of the original drug chamber;

[0017] Figure 2 This is a structural diagram of the drug chamber portion involved in the present invention;

[0018] Figure 3 A schematic diagram of the barrel being closed;

[0019] Figure 4 This is a schematic diagram of the short cartridge case being closed. Detailed Implementation

[0020] To better illustrate the purpose, technical solution, and advantages of this utility model, further explanation is provided below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only used to illustrate the technical effects of this utility model and are not intended to limit the scope of protection of this utility model.

[0021] Example 1

[0022] like Figures 1-4 As shown, a barrel chamber structure that minimizes the extraction resistance of long and short cartridge cases includes a barrel 2 with a hollow chamber. The inner wall of the barrel chamber has several evenly distributed groove-shaped structures 2-1, with rounded edges to reduce stress concentration. Six groove-shaped structures 2-1 are evenly distributed around the barrel chamber axis, spaced at 60° intervals. The starting end of the groove is located in the beveled section before the cartridge case mouth (with the muzzle pointing forward) and after the starting point of the barrel rifling, extending beyond the front end of the long cartridge case 1-1 used in conjunction, and positioned midway between the mouth face of the long cartridge case 1-1 and the starting point of the barrel rifling. The ending end of the groove is located in the chamber body, at the front end of the short cartridge case 1-2 used in conjunction. The short cartridge case 1-2 is a semi-combustible cartridge case.

[0023] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A barrel chamber structure that makes the extraction resistance of long and short cartridge cases approach the same, characterized in that, Includes a barrel (2), which has a hollow medicine chamber; the inner wall of the medicine chamber of the barrel has a number of evenly distributed groove-shaped structures (2-1), the inner edges of the groove-shaped structures (2-1) are rounded to reduce stress concentration in the barrel; the starting end of the groove is located at the slope of the medicine chamber, and the starting position exceeds the front end of the long medicine cartridge (1-1) used in conjunction; the ending end of the groove is located at the body of the medicine chamber, near the front end of the short medicine cartridge (1-2) used in conjunction.

2. The barrel chamber structure according to claim 1, which makes the extraction resistance of long and short cartridge cases approach the same, is characterized in that, The groove-shaped structure (2-1) has six evenly distributed grooves around the axis of the medicine chamber of the tube, with an interval of 60°.

3. The barrel chamber structure according to claim 1, which makes the extraction resistance of long and short cartridge cases approach the same, is characterized in that, The distance from the starting position of the groove to the starting position of the rifling of the barrel (2) is a, where a is greater than 0 and less than the distance from the end face of the mouth of the long cartridge (1-1) to the starting position of the rifling of the barrel.

4. The barrel chamber structure according to claim 1, which makes the extraction resistance of long and short cartridge cases approach the same, is characterized in that, The distance from the end of the groove to the end face of the short cartridge (1-2) is b, and the value of b is within ±20mm.

5. The barrel chamber structure according to claim 4, which makes the extraction resistance of long and short cartridge cases approach the same, is characterized in that, The value of b is 0.

6. The barrel chamber structure according to claim 1, which makes the extraction resistance of long and short cartridge cases approach the same, is characterized in that, The short cartridge (1-2) is a semi-flammable cartridge.

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