JPH0412385Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field to which the idea belongs]

This 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 lower side of the gun barrel, which is not exposed to sunlight, increases only slightly, so as shown in Figure 2, due to the difference in thermal expansion, the long gun barrel 2, which has a length l, has a length δ at its tip. This results in a downward bend as shown.
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, the interior of the gun barrel receives a gas shock 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 its material lifespan. or
The expansion of the gun barrel diameter due to thermal expansion creates a gap between the bullet and the cavity, causing combustion gas to leak. In addition, this also induces friction on the inner surface of the cavity due to the gas. Since this heat is concentrated particularly at the base of the gun barrel and the upper side of the gun barrel due to heat convection within the cavity, it is desirable to promote heat dissipation by uniformizing the temperature of the entire gun barrel. Generally, the amount of heat transferred to the gun barrel is a function of the velocity and density of the gas inside the gun and its flame temperature, and it is said that about 5 to 8% of the propellant combustion energy is transferred to the gun barrel. However, only the surface layer of the inner surface of the gun barrel is heated during this time. For this reason, during continuous firing, the base temperature (temperature inside the barrel cavity just before the next bullet is fired) rises, and the entire gun barrel becomes heated, making continuous firing impossible. As a countermeasure against this problem, as shown in Fig. 3, a heat jacket 3, which serves as an annular heat pipe, is installed on the outer periphery of the gun barrel in close contact with heat transfer, and the latent heat generated by the evaporation and condensation cycle of the working fluid in the heat pipe is installed. There has already been a system in which heat is transferred between high-temperature areas and low-temperature areas, thereby efficiently dispersing the heat generated locally in the gun barrel throughout the gun barrel for uniform heat dissipation and heat dissipation. Proposed. Note that 4 is a smoke evacuation device installed in the middle of the gun barrel. By the way, the gun barrel is made of special steel such as Ni-Cr-Mo steel, and its coefficient of thermal expansion is different from that of the heat pipe component material (generally stainless steel is used) as the heat jacket mentioned above. Further, as shown in the figure, the gun barrel is equipped with a smoke evacuation device 4 in the middle thereof, and the gun barrel as a whole is constructed so that the diameter of the gun barrel gradually becomes smaller from the base to the tip. For this reason, when attaching the heat jacket to the long gun barrel 2, the third
As shown in the figure, heat jackets 3, which are divided into a plurality of parts corresponding to the diameter of the gun barrel at the mounting position along the longitudinal direction of the gun barrel, are lined up and installed individually on the gun barrel, and thermal jackets 3 due to differences in thermal expansion are applied. The aim is to reduce the amount of wear and tear and make it easier to install. Next, a heat pipe type heat jacket and its mounting structure in a conventional device are shown in FIGS. 4 and 5.
In other words, each independent heat pipe type heat jacket 3 divided into a plurality of pieces along the longitudinal direction of the gun barrel 2 is
An inner sheath 31 and an outer sheath 32 are made of thin plates that are seal-welded to each other, end plates 33 and 34 that straddle the inner and outer sheaths and close both end faces in the axial direction, and a slit-shaped notch in the axial direction are sandwiched therebetween. The fastening flanges 35 and 36 provided on both sides constitute a sealed cylinder with a C-shaped cross section and an inner and outer double cylinder structure, and the heat pipe working fluid and the inner cover 3 are contained in the inner sealed space.
1. It has built-in wicks 37 and 38 that are closely disposed on the inner wall surface of the outer cover 32. Note that the operation of the heat pipe is well known, and its explanation will be omitted here. In order to attach such a heat jacket 3 to the gun barrel 2, the above-mentioned 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 receives a large recoil impact each time it fires, with a maximum acceleration of approximately 350G.
On the other hand, as mentioned above, the heat jacket 3 is individually fixed to the gun barrel by tightening bolts, but when such a large impact force is applied, the bolts may become slightly loosened during long-term use. The impact force overcomes the clamping force, which causes the heat jacket 3 to shift and shift over the gun barrel, causing the ends of the heat pipes to repeatedly collide with each other. For this reason, peeling occurs at the welded portion of the sealed cylinder, causing the airtightness inside the cylinder to be lost, and the heat pipe no longer functions as a heat pipe. Similar troubles can also occur due to large amounts of heat generated in the gun barrel during firing or heat cycles such as solar heat. In other words, the coefficient of linear expansion of a heat pipe made of stainless steel is higher than that of the special steel for the gun barrel mentioned above, and when the heat pipe generates the heat described above, the heat pipe is
If thermal stress is applied to the heat jacket 3 due to the difference in thermal expansion between the The cylinder 3 moves slightly over the gun barrel, and by repeating this process, the heat jacket cylinder shifts to one side, and the sealed cylinders of the heat pipes come into contact with each other. Furthermore, when the above-described heat cycle is applied in this state, thermal stress is repeatedly applied to the welded portion, eventually resulting in peeling of the welded portion. Another problem is that with the conventional structure, rainwater seeps into the small gap between the gun barrel 2 and the heat jacket 3, causing the gun barrel to corrode over a long period of time.

[Purpose of invention]

This idea was developed in consideration of the above points, and its purpose was to skillfully absorb and absorb the recoil impact caused by firing and the thermal expansion caused by heat generation, and the heat pipe type heat jackets installed in parallel on the gun barrel. To provide a heat pipe type heat envelope device which prevents heat jackets from directly colliding with each other.

[Key points of the idea]

In order to achieve the above purpose, this invention inserts an elastic buffer member between heat pipe-type heat jackets installed side by side on the gun barrel, so that the recoil impact force or heat cycle during firing can prevent the adjoining It prevents matching heat jackets from directly colliding with each other, and its buffering effect prevents excessive stress from being applied to the sealed tube of the heat pipe, thereby safely protecting the heat pipe type heat jacket. It is.

[Example of idea]

6 and 7 show an embodiment of this invention, in which rubber tubes are sandwiched between independent heat pipe type heat jackets 3 mounted in parallel on the outer periphery of the gun barrel 2. An elastic ring 6 as an elastic buffer member made of an elastic material such as the like is inserted.
This elastic ring 6 also serves as a sealing member for sealing the gap between the heat jackets 3, and is disposed in close contact with the left and right end plates 33, 34 of the heat jacket 3. According to the above configuration, even if the recoil impact force due to shooting acts on the heat jacket 3, the heat jackets do not directly collide with each other, and the impact force is buffered and absorbed by the elastic ring 6. Therefore, an excessive concentrated load is not applied to the heat jacket 3, and its welded parts etc. can be safely protected. Similarly, even if a difference in thermal expansion occurs between the gun barrel 2 and the heat jacket 3 due to heat generation such as firing heat or solar heat, this thermal expansion is absorbed by the elastic length and the heat jackets are directly connected to each other. They do not come into contact with each other, and the concentration of thermal stress on the weld is avoided. Furthermore, the bullet ring 6
acts as a seal, so rainwater, etc.
There is no risk of it entering the gap between the gun and the gun barrel 2,
This prevents corrosion of the gun barrel.

[Effect of the idea]

As mentioned above, according to this invention, by inserting an elastic buffer member between the independent heat pipe type heat jackets mounted side by side on the gun barrel, the heat pipe type heat jackets can There is no direct contact with each other due to the recoil impact force caused by the shot, or thermal expansion due to heat generated by shooting heat, solar heat, etc., and the cushioning effect of the elastic cushioning member prevents excessive force on the welded heat pipe sealed cylinder. It is possible to safely protect the heat pipe type heat jacket and improve its reliability, such as by preventing the concentration of heat.

[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 side view and a partially sectional end view showing the structure of a heat pipe type heat jacket, FIG. 6 is a cross-sectional view of the structure of an embodiment of this invention showing how it is attached to a gun barrel, and FIG. 7 is a detailed enlarged sectional view of the main part in FIG. 6; 2... Gun barrel, 3... Heat pipe type heat jacket, 6
...An elastic ring as an elastic buffer member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A heat pipe-type heat cladding tube with a plurality of independent configurations divided into a plurality of pieces along the longitudinal direction of the gun barrel is installed side by side on the outer periphery of the gun barrel to uniformize and dissipate heat from the gun barrel. What is claimed is: 1. A heat pipe type heat casing device, characterized in that an elastic buffer member is inserted between adjacent heat casings. (2) A heat pipe type heat casing device according to claim 1 of the utility model registration claim, characterized in that the elastic buffer member is an elastic ring that also serves as a gap seal between the heat casings. Device.