JPH0535359B2 - - Google Patents

Description

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

The present invention relates to a heat pipe type heat envelope device that is attached to a gun barrel of a tank or the like and uniformizes and radiates heat from the gun barrel by dispersing solar radiation or localized heat generated by shooting.

[Prior art and its problems]

The temperature of gun barrels mounted on tanks, etc. increases significantly on the upper side, which is exposed to sunlight, while the temperature on the lower side, which is not exposed to sunlight, increases only slightly.
Due to the difference in thermal expansion caused by the temperature difference between the top and bottom, the long gun barrel bends slightly downward at its tip. The degree of this bending varies depending on weather conditions and other factors, and is a major cause of reduced shooting accuracy. In addition, each time a shell is fired, the inside of the gun barrel receives a gas shock from the combustion of the propellant, and heat is also generated due to mechanical friction between the projectile and the inside of the gun barrel. In addition to affecting the lifespan, the expansion of the gun barrel caliber due to thermal expansion changes the contact resistance between the bullet and the gun barrel, which affects the initial velocity of the bullet and reduces shooting accuracy. To this end, as a measure to improve shooting accuracy, an annular heat pipe type heat jacket is installed on the outer periphery of the gun barrel 2 protruding from the turret 1, as shown in Figure 4, in close thermal contact with the gun barrel 2. evaporation of liquid,
The latent heat associated with the condensation cycle quickly transfers heat between areas of higher temperature and areas of lower temperature.
In this way, the heat generated locally in the gun barrel is efficiently dispersed throughout the gun barrel for uniform heating and heat dissipation.
Already proposed by No. 7867. By the way, as shown in the figure, the gun barrel 2 is equipped with a smoke evacuation device 3 in the middle, and the gun barrel as a whole is configured in such a shape that the outer diameter of the gun barrel gradually becomes thinner from the base of the turret side to the tip. . For this reason, when attaching a heat pipe type heat jacket to the long gun barrel 2, the heat jacket must be divided into multiple pieces along the longitudinal direction of the gun barrel 2, as shown in Figure 4, and each piece must be attached separately. Separate heat pipe type heat jacket cylinders 4, which are independently constructed according to the diameter of the gun barrel at the position, are arranged and individually mounted on the gun barrel. This split mounting structure not only simplifies the production and installation of the heat jacket, but also prevents the heat pipe from losing its function even if a part of the heat pipe is damaged by being hit by a bullet. This has the advantage of preventing it from spreading. Next, the above-mentioned split type heat pipe type heat jacket 4
FIG. 5 shows the conventional structure of the . That is, each independent heat pipe type heat jacket 4 that is divided into a plurality of pieces along the longitudinal direction of the gun barrel 2 has an inner cylinder 5, an outer cylinder 6, and an inner and outer cylinder 5 each made of a thin plate that is seal-welded to each other. and a ring flange 7 having a U-shaped cross section that wraps around the inner and outer cylinders and closes both end faces in the axial direction, and a ring flange 7 that is welded to both sides of the inner and outer cylinders across the axial slit-shaped notch (not shown). The tightening flange constitutes a sealed cylinder with an inner and outer dual structure that has a C-shaped cross section as a whole, and furthermore, the heat pipe working fluid is disposed in the sealed space inside the cylinder in close contact with the inner wall surfaces of the inner cylinder 5 and the outer cylinder 6. It has a built-in pump 8, and an evaporation space 9 for the working fluid is formed inside thereof. The operation of the heat pipe is as described above, and heat generated locally due to the evaporation-condensation cycle of the working fluid sealed in the internal space is transferred between the high-temperature region and the low-temperature region. uniform heat distribution and heat dissipation throughout the entire circumference of the heat jacket. To attach such a heat pipe type heat jacket 4 to the gun barrel 2, widen the axial notch part described above and cover the outer periphery of the gun barrel, then tighten bolts at multiple locations between the tightening flanges, and attach the heat jacket to the gun barrel 2. is firmly fastened so that it is in close contact with the gun barrel around the entire circumference. In addition, a ring-shaped elastic body 10 as shown in the figure is inserted between the joints of the heat jackets 4 that are adjacent to each other on the gun barrel. It prevents the heat pipes from directly colliding with each other, and its buffering effect prevents excessive stress from being applied to the sealed envelope of the heat pipe, thereby protecting the safety of the heat pipe type heat jacket. By surrounding the gun barrel and equipping the outer periphery with a heat pipe-type heat jacket, it is possible to reduce the effects of solar heat and firing heat, thereby significantly improving shooting accuracy. However, with the conventional configuration, there is a limit to the heat uniformity and heat dissipation effect of the heat pipe type heat cladding, and since solar heat directly enters the heat cladding 4, its thermal influence is large. There is a drawback that sufficient results cannot be achieved in improving accuracy. Therefore, in order to further improve gun barrel shooting accuracy, it is desired to develop a heat pipe type heat jacket device with higher performance in terms of heat uniformity and heat dissipation effect.

[Purpose of the invention]

This invention has been made in consideration of the above points, and has improved the heat pipe type heat jacket of the conventional structure, and provides a uniform heating system that further improves the accuracy of shooting by equipping the heat jacket. The purpose of the present invention is to provide a heat pipe type heat envelope device with high heat dissipation performance.

[Key points of the invention]

In order to achieve the above object, the present invention covers the outer periphery of each heat pipe type heat cladding for heat pipe type heat claddings arranged side by side on the gun barrel, so that air is allowed to flow between the outer periphery of the heat cladding and the circumferential surface of the heat cladding. By providing a sunshade cover that forms a space that serves as a convection path, the sunshade cover prevents direct solar radiation from being applied to the heat casing, minimizing the intrusion of solar heat, and thereby preventing the heat casing from reaching the gun barrel. In addition to improving the heat uniformity effect, on the other hand, the space between the sunshade cover and the heat jacket is used as a natural convection path for air, and the air flow that flows through this space further enhances the heat dissipation effect of the heat generated by shooting. This is what I did.

[Embodiments of the invention]

Fig. 1 is a partially cutaway side view of a heat pipe type heat jacket according to an embodiment of the present invention, Fig. 2 is a sectional view of Fig. 1, and Figure 3 is an attachment of the heat pipe type heat jacket to the gun barrel. This is a diagram showing the state, and the same members as in FIGS. 4 and 5 are given the same reference numerals. That is, the inner cylinder 5, the outer cylinder 6, the ring flange 7,
Tension flanges 11 are welded to both sides of the heat pipe type heat jacket 4, which has a C-shaped cross section and is made up of heat jackets 8 and the like, across the notch on the lower surface side of the heat jacket 4, and is inserted into this flange 11. The heat jacket 4 is firmly fixed to the gun barrel 2 by tightening the tension rods 12 through the disc spring 13 and the fastening bolt 14. According to the present invention, a sunshade cover designated by reference numeral 15 is attached to the heat pipe type heat jacket 4 so as to cover the outer peripheral area of the heat jacket. The sunshade cover 15 is made of a lightweight thin metal plate, plastic, or cloth, and is covered with a space 16 that serves as an air convection passage between the heat cover 4 and the outer peripheral surface of the heat jacket 4. and a ventilation hole 1 on its circumferential surface that communicates between the inside and outside.
7 are opened in large numbers in a dispersed manner. In the illustrated example, the sunshade cover 15 is made of metal and is integrally welded and fixed onto the circumferential surface of the heat jacket 4, covering the circumferential area except for the above-mentioned tension flange 11.
The ventilation hole 17 is formed by locally cutting the cover 15 and pressing the cut member so that it bulges toward the inner circumference. Further, the bulging portion 18 formed by this press work serves as a spacer for forming a space serving as an air convection passage between the bulge portion 18 and the outer circumferential surface of the heat jacket 4, as will be described later. Note that 19 is an independent sunshade cover that covers the outer periphery of the base portion of the gun barrel 2. According to the above configuration, first, the heat jacket 4 does not receive direct solar radiation, and the solar heat is received by the sunshade cover 15 and then transferred to the heat jacket 4 via the air layer. Therefore, the solar heat reaching the heat jacket 4 is attenuated to less than half, and the heat is uniformized in the surrounding area. As a result, the thermal influence of solar heat on the gun barrel 2 is significantly improved compared to the conventional structure. On the other hand, even if the temperature of the gun barrel increases due to continuous shooting, etc., the heat pipe type heat jacket 4
On the outer circumferential surface of the gun barrel side, the space 16 between it and the sunshade cover 15 is used as an air convection path, and low-temperature outside air flows through the vent hole 17 due to the chimney effect as shown by the arrow P here. It takes the generated heat and radiates it to the outside. Therefore, a sufficient heat dissipation effect can be obtained. As a result, the uniform heat effect of the heat jacket 4 and the above-mentioned heat dissipation effect work together to further reduce the temperature rise of the gun barrel 2 itself and the temperature difference in the circumferential direction, thereby reducing the thermal effects of solar heat and firing heat. By eliminating them, you will be able to greatly improve your shooting accuracy.

【Effect of the invention】

As described above, according to the present invention, each heat pipe type heat casing is provided with a sunshade cover that covers the outer periphery of the heat casing and forms a space between it and the circumferential surface of the heat casing to serve as an air convection passage. This prevents solar heat from directly entering the heat pipe type heat casing, while at the same time using the space between the heat casing and the sunshade cover as an air convection path, which allows the airflow flowing through this space to absorb the heat generated by the shot. It is now possible to effectively reduce the temperature rise of the gun barrel and the heat pipe type heat casing by dissipating heat outward, thus improving the heat uniformity and heat dissipation performance of the heat pipe type heat casing, and reducing solar heat and firing heat. It is possible to further improve the shooting accuracy of the gun barrel by reducing the effects of such factors.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing the structure of a heat pipe type heat jacket according to an embodiment of the present invention, FIG. 2 is a sectional view taken in the direction of arrows in FIG. 1, and FIG. FIG. 4 is a conventional configuration diagram corresponding to FIG. 3, and FIG. 5 is a partially enlarged sectional view showing the detailed structure of the heat jacket in FIG. 4. It is. In the figure, 2... Gun barrel, 4... Heat pipe type heat jacket, 1
5... Sunshade cover, 16... Space, 17... Ventilation hole.

Claims (1)

[Claims] 1. A heat pipe type heat cladding device that equalizes the temperature of the gun barrel and radiates heat by aligning heat pipe type heat cladding tubes divided into a plurality of pieces along the longitudinal direction of the gun barrel around the outer periphery of the gun barrel. The heat pipe type heat casing is characterized in that each heat pipe type heat casing is provided with a sunshade cover that covers the outer periphery of the heat casing and forms a space between it and the circumferential surface of the heat casing to serve as an air convection passage. Covering device. 2. A heat pipe type heat casing device according to claim 1, characterized in that vent holes communicating between the inside and outside of the sunshade cover are distributed on the circumferential surface of the sunshade cover. .