JPH0419477B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to an annular heat pipe that is attached to the gun barrel of a tank or the like and distributes solar radiation or localized heat generated by shooting to equalize and radiate heat.

[Prior art and its problems]

Figure 1 shows a schematic diagram of a tank, where 1 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 significantly, while the temperature of the lower side that is not exposed to sunlight increases only slightly.As shown in Figure 2, the difference in thermal expansion increases. As a result, the long gun barrel 2 having a length l bends downward at its tip as indicated by a dimension δ. This bending varies depending on weather conditions and other factors, and is a major factor in reducing shooting accuracy. In addition, each time the gun barrel is fired, it is subjected to gas impact from the combustion of the propellant, and heat is generated due to mechanical friction between the projectile and the inside of the barrel, resulting in high temperatures in the gun barrel and affecting the life of the material. or
As the gun barrel caliber expands due to thermal expansion, the contact resistance between the bullet and the gun barrel changes, which affects the initial velocity of the bullet and reduces shooting accuracy. This effect becomes especially large when bullets are fired continuously. Moreover, since this heat is concentrated at the base of the gun barrel and at the upper side of the gun barrel due to heat convection within the cavity, it is desirable to promote heat dissipation by equalizing the temperature of the entire gun barrel and dispersing the heat. As a countermeasure against this problem, as shown in Fig. 3, an annular heat pipe 3 is installed in close contact with the outer periphery of the gun barrel. It has already been proposed that heat is transferred between the lower region and the lower region, thereby efficiently dispersing the heat generated locally in the gun barrel over the entire region of the gun barrel, thereby achieving heat uniformity and heat dissipation. Note that 4 is a smoke evacuation device installed in the middle of the gun barrel. Next, a conventional annular heat pipe and its mounting structure are shown in FIGS. 4 and 5. In other words, each of the annular heat pipes 3 having an independent configuration divided into a plurality of parts along the longitudinal direction of the gun barrel 2 has an inner cover 31 and an outer cover 3 made of thin plates that are seal-welded to each other.
2. End plates 33 and 34 that span the inner and outer sheaths and close both end faces in the axial direction, and fastening flanges 3 provided on both sides of the axial slit-shaped notch.
5 and 36 constitute a sealed cylinder with a double inner and outer cylinder structure exhibiting a C-shaped cross section, and the heat pipe working fluid and the inner cover 31 and outer cover 32 are contained in the inner sealed space.
It has built-in wicks 37 and 38 that are placed in close contact with the inner wall surface. Note that the operation of the heat pipe is well known, and its explanation will be omitted here. In order to attach such an annular heat pipe 3 to the gun barrel 2, the aforementioned notch is widened to the left and right, and the outer periphery of the gun barrel is covered, and then the bolt 5 is inserted between the flanges 35 and 36.
Concluded. By the way, this type of gun barrel has a recoil of about
Impact acceleration of up to 350G is added. To this end, the conventional configuration, in which an annular heat pipe constructed as an independent component is attached to the gun barrel as described above, and the flanges of this heat pipe are fastened with bolts to fix it on the gun barrel, cannot Extremely high bolt tightening force is required to withstand large impacts, and if the bolts become loose, there is a risk that the heat pipe will shift on the gun barrel and become lopsided.
In addition, it is technically extremely difficult to make the inner jacket of the heat pipe completely adhere to the outer circumferential surface of the gun barrel over the entire area when attached to the gun barrel due to problems in processing accuracy and assembly. Therefore, the heat transfer between the gun barrel and the heat pipe was low, and the heat pipe had the disadvantage that the heat uniformity and heat dissipation effect of the gun barrel could not be sufficiently exerted.

[Purpose of the invention]

This invention was made in consideration of the above-mentioned points, and its purpose is to eliminate the drawbacks of the conventional art, and to create a uniform gun barrel that is highly impact resistant and exhibits excellent heat uniformity and heat dissipation performance. The purpose of the present invention is to provide an annular heat pipe for heat dissipation.

[Key points of the invention]

In order to achieve the above object, the present invention uses the gun barrel itself as a component of a heat pipe, and a metal jacket is hermetically fixed to the outer circumferential area of the heat pipe by welding or the like. In addition to defining the working space for the liquid, the annular heat pipe is integrated with the gun barrel by disposing heat pipes on the outer circumferential surface of the gun barrel and the inner wall surface of the jacket. The aim is to improve heat conductivity, reduce the weight of the heat pipe, and improve impact resistance.

[Embodiments of the invention]

FIG. 6 and FIG. 7 show an embodiment of the present invention. That is, ring-shaped partition walls 21 are provided on the outer circumferential side of the gun barrel 2 and stand up from the circumferential surface at appropriate intervals along the longitudinal direction. A cylindrical metal jacket 6 surrounding the outer periphery is hermetically welded or brazed. As a result, the heat pipe working fluid evaporates between the jacket 6 and the outer surface of the gun barrel 2.
An annular closed working space 7 is defined in which condensation takes place. In addition, for each section, wicks 8 and 9 for holding hydraulic fluid are provided on the outer peripheral surface of the gun barrel 2 and the inner wall surface of the casing 6, respectively, and are fixed to the gun barrel and casing sides by spot welding, for example, overlapping them with a wire mesh. ing. If necessary, a wick support 10 made of, for example, a wire mesh formed into a corrugated shape is interposed between the wicks 8 and 9. The action of the heat pipe with the above configuration is the same as that of conventional ones; the working space is depressurized and a small amount of the heat pipe working fluid sealed there is evaporated and condensed to achieve uniform heating of the gun barrel and heat dissipation. .
In this case, unlike the conventional structure, the gun barrel 2 itself is configured to also serve as the inner jacket of the annular heat pipe 3, so the hydraulic fluid comes into direct contact with the outer surface of the gun barrel 2, and heat is not exchanged between the two. It will be done. Therefore gun barrel 2
This results in high heat transfer between the two. Further, the jacket 6 is integrated with the gun barrel 2 by welding or brazing, so that it will not shift in the axial direction even if a shock associated with firing is applied. Furthermore, since the inner cover is omitted compared to the conventional structure, the heat pipe 3 becomes lighter and smaller. As shown in the example, the heat pipe is divided into multiple sections along the length of the gun barrel and each section is configured independently, so that if one section is damaged by a bullet etc., the heat pipe will not lose its function. You can prevent it from spreading to the whole by stopping it in that category.

[Effects of the Invention] As described above, according to the present invention, a metal jacket is sealed and attached around the gun barrel while leaving a gap between the outer peripheral surface of the gun barrel and the working space for the hydraulic fluid. fixed,
In addition, by installing heat pipes on the outer circumferential surface of the gun barrel and the inner wall surface of the casing, and integrating the annular heat pipe with the gun barrel, it has high impact resistance and improves heat transfer between it and the gun barrel. It is possible to provide a high-performance annular heat pipe for heat uniformity and heat dissipation of gun barrels that can maximize heat uniformity and heat dissipation effects.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the tank, Figure 2 is a side view of the gun barrel simulating sunlight exposure, Figure 3 is a partial cross-sectional side view of the gun barrel with a heat jacket attached, and Figure 4 5 is a longitudinal sectional side view and a partially cutaway end view of a conventional heat jacket showing how it is attached to a gun barrel, FIG. 6 is a partially sectional side view of an embodiment of the present invention, and FIG. 6 is a sectional view taken in the direction of arrows in FIG. 6. FIG. 2... Gun barrel, 3... Annular heat pipe, 6...
Covering, 7... working space, 8, 9... wick.

Claims (1)

[Scope of Claims] 1. An annular heat pipe that is attached to the outer periphery of the gun barrel to uniformly heat and radiate heat from the gun barrel, which maintains a gap between it and the outer periphery of the gun barrel that serves as a working space for the heat pipe working fluid. A gun barrel for equalizing heat, characterized in that a metal jacket is sealed and fixed around the gun barrel, and wicks are provided on the outer circumferential surface of the gun barrel and on the inner wall of the jacket, respectively. Annular heat pipe for heat dissipation. 2. In the heat pipe according to claim 1, the jacket is divided into a plurality of sections along the longitudinal direction of the gun barrel, and is attached to the gun barrel so that each section defines an independent sealed working space. An annular heat pipe for equalizing and dissipating gun barrel heat, which is characterized by being fixed.