JPS5944597A - Gun barrel with heat pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a gun barrel equipped with a hilted pipe.

Gun barrels attached to tanks and the like are constructed in a long cylindrical shape to improve the accuracy of a single bullet, but this shape poses a problem in that the gun barrel is easily affected by heat.

Fig. 1 is a schematic diagram of the tank, and Fig. 2 is an enlarged view of the gun barrel, where l is the tank body and 2 is the gun barrel. In such a structure, the temperature of the upper side of the gun barrel that receives sunlight increases greatly, while the temperature of the lower side that does not receive sunlight rises only slightly.As shown in Figure 3, the difference in thermal expansion causes a long gun barrel. 2 is bent (indicated by δ in the figure), which has the disadvantage that shooting accuracy deteriorates.

In addition, the firing efficiency (firing cycle and pattern) and rate of fire (number of bullets fired per unit time) are the determining factors for the lifespan of a gun barrel, but the inside of the gun barrel burns propellant each time it is fired. The flame temperature rises to 2500-30000K, pressure 2500-5000 atm, speed 800=
The gun barrel becomes hot due to the impact of the gas at 1600 m/s and the heat generated by the mechanical friction between the bullet and the bandolier inside the barrel cavity. This may affect the lifespan of the material, or the enlargement of the barrel diameter due to thermal expansion may create a gap between the bullet and the cavity, causing combustion gas to leak. In addition, this also induces abrasion of the inner surface of the cavity due to the gas.

Generally, the amount of heat transferred to the gun barrel is determined by the velocity of the gas inside the gun.

As a function of density and its flame temperature, 5 to 8 inches of propellant combustion energy is transferred to the ash barrel. However, since the heat transfer time for each shot is extremely short, only a very superficial layer of the inner surface of the barrel cavity is heated within this time. For this reason, the maximum temperature gradient reaches 10,000 degrees Celsius, and since heat conduction in the thickness direction is extremely slow, the maximum temperature on the inner surface of the cavity reaches 1100 degrees Celsius. The internal surface temperature of this cavity rapidly decreases to below 450°C after 10 seconds, for example, before the next bullet is fired, but this is the decisive factor for mechanical wear on the internal cavity surface and expansion of heat shock. ,
This temperature on the inner surface of the barrel just before the next bullet is fired is called the base temperature of the gun barrel (13ase temperature), and when continuous firing is performed, the temperature is determined by the bullet type and firing efficiency for each gun type, as shown by the broken line A in Figure 4. Draw a unique curve.

This curve is expressed as a function of n, the number of bullets fired in rapid succession, with Δt as the corner between shots, and the smaller Δt is and the larger n is, the steeper the slope of this curve becomes, which has a greater effect on the wear and deterioration of the gun barrel. Now, ignoring the speed of temperature change, the plastic limit temperature of steel (gun barrel material) of 450 to 550'C is reached at a thickness of 0.15-() and 2wax years from the inside of the cavity. In continuous firing, the base temperature increases [7, the entire gun barrel is overheated 1731
As a result, continuous shooting becomes impossible.

In this way, sunlight and heat generated during firing are concentrated particularly at the base and upper part of the gun barrel, so it is desirable to promote heat dissipation by equalizing the temperature of the entire gun barrel.

The present invention was made in view of these points.

The purpose of this invention is to provide a gun barrel equipped with a heat pipe that disperses and cools the heat generated by the rays 1, in order to eliminate the influence of heat caused by light and to uniformly heat the gun barrel.

According to the present invention, this objective is achieved by providing a plurality of annular and continuous axial grooves on the boundary between the U-shaped gun center and the barrel in the gun barrel, and interposing a wick.

Embodiments of the present invention will be described below based on the drawings. Fifth
6, a plurality of annular grooves 4 and continuous axial grooves 5 are provided directly on the gun barrel 3 itself, and the outer periphery thereof is surrounded by a wick 6, and furthermore, the outer periphery is covered with stainless steel 6'i, i, etc. The TJ 7 is covered with a sheathing tube 7 and both ends are welded or brazed 8 to achieve an airtight joint.
A hole to which a copper tube 9 is welded is provided in each jacket 7, and the pressure is reduced from this hole and a small amount of hydraulic fluid is sealed. For example, flow νIt -11, R-11
Use a refrigerant such as 4. After sealing the hydraulic fluid, by sealing the above-mentioned φ 9, a gun barrel having a working space for the hydraulic fluid, that is, a heat pipe is constructed.

7 and 8 show other embodiments of the present invention, for example, when a plurality of annular grooves 11 and a plurality of axial grooves 12 connected thereto are provided on the side of the sleeve 10 made of stainless steel (ν1). After installing the wick 13 on the inner circumference of the shell, the gun barrel 14
Insert the sleeve lO into the housing and attach it by welding or soldering 8.
As in the previous embodiment, a hole to which a copper tube 9 is welded is formed in a part of the sheath 1041J,
The pressure is reduced from this and a small amount of hydraulic fluid is sealed in the tank.

In the above embodiment, although it is possible to construct the jacket 7 and 10 by a single unit, due to manufacturing reasons, it is possible to construct the jacket 7 by a single unit.
Adjacent casings are welded or brazed to each other, and although the structure interposed between the gun barrel and the casing was described in the above embodiment, the present invention is not limited to this. For example, the wick may be inserted into a groove provided in the gun barrel or sleeve. Historically, it is not necessary to provide grooves on either the gun barrel or the casing; for example, a plurality of annular grooves may be provided on the gun barrel, and a plurality of axial grooves may be provided on the casing.

As is clear from the above description, according to the present invention.

Sun 3'e? ! When receiving Z, the side receiving sunlight becomes the heating side as a heat pipe, and the working fluid boils and moves at high speed in the groove as steam. As a result, the temperature rises on the side that is not exposed to sunlight, and the entire gun barrel remains at the same temperature, preventing the gun barrel from bending.In addition, the heat is dispersed and dissipated by the linear heat pipe in the axial direction, which prevents the barrel from bending. It also has the effect of accelerating the action, thereby improving the durability and lifespan of the gun.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the tank, Figure 2 is a cross-sectional view of the gun barrel, and Figure 3 is a schematic diagram of the tank.
The figure shows a side view simulating the state in which the gun barrel is exposed to sunlight and its axis, and Figure 4 shows the inner surface temperature of the gun barrel over time due to continuous firing.
A part of the present invention 71ζ when a groove is cut into the L gun seal itself
Figure 6a, + b is a partial IY cross-sectional view of Figure 5 showing BU, dog 11 (cross-sectional view and cross-sectional view, Figure 7M).
This is one example of the present invention when '(1') is provided on the f and ff sides.
Figure 7 shows a partially enlarged longitudinal view and a detailed cross-sectional view. 3.14 Gun barrel, 4.11... Groove 1, 5, 12
・In direction of i part)(”・J6.13...Wick, 7
．． 10・晟f:j） pierce 72 Figure 123 Figure-74 Mouth ○ resistant Tpu mouth 6 Figure 17 Mouth 8 Figure

Claims (1)

[Claims] A gun barrel equipped with a single dove, characterized in that the gun barrel is covered with a casing, and a plurality of annular and continuous axial grooves are provided at the boundary between the gun barrel and the casing, and a wick is interposed.