JPS61223500A - Heat pipe type heat coated cylinder device - 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] [Technical field to which the invention pertains]

The present invention relates to a heat pipe type heat covering 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]

For gun barrels mounted on tanks, etc., the temperature on the upper side, which receives sunlight, increases significantly, while the temperature on the lower side, which is not exposed to sunlight, increases only slightly. Due to the difference in thermal expansion, the longer barrel bends slightly downward at its tip. The degree of this bending varies depending on weather conditions and other factors, which 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. Therefore, as a measure to improve shooting accuracy, as shown in Fig. 4, an annular heat pipe heat-forming jacket is installed on the outer periphery of the gun barrel 2 protruding from the turret 1 in close contact with it for heat transfer. Evaporation of liquid. The latent heat associated with the condensation cycle quickly transfers heat between high-temperature areas and low-temperature areas, and as a result, heat generated locally in the gun barrel is efficiently dispersed throughout the gun barrel for uniform heating and heat dissipation. A similar method has already been proposed by the same applicant as the present invention, for example, in U.S. Pat. No. 59-7867. 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 outer diameter of the gun barrel as a whole is configured so that it gradually becomes narrower 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 is divided into a plurality of pieces along the longitudinal direction of the gun barrel 2 in advance as shown in Fig. 4.
In addition, each of these is mounted by arranging split heat pipe type heat jacket cylinders 4, which are independently constructed according to the diameter of the gun barrel at the position, and mounting them individually on the gun barrel. This split mounting configuration not only simplifies the production and installation of the heat jacket, but also prevents the loss of the heat vibrating function in only one part of the heat pipe, 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, FIG. 5 shows a conventional structure of the above-mentioned split heat pipe heat-forming jacket 4. As shown in FIG. That is, each of the independent heat pipe type heat jacket tubes 4 divided into a plurality of pieces along the longitudinal direction of the gun barrel 2 has an inner tube 5. A ring flange 7 with a U-shaped cross section that wraps around the outer cylinder 6° and the inner and outer cylinders 5 and 6 and closes both end faces in the axial direction.
Although not shown, the clamps welded and joined on both sides of the axial slit-shaped notch of the inner and outer cylinders and the flanges form a sealed cylinder with a dual structure of an inner and outer structure having a C-shaped cross section as a whole. At the same time, the heat pipe working fluid and the inner cylinder 5. It has a built-in pipe 8 that is closely disposed on the inner wall surface of the outer cylinder 6, and forms an evaporation space 9 for the working fluid inside. 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. In order to attach such a heat pipe heat-forming jacket 4 to the gun barrel 2, the above-mentioned axial notch is widened and the outer periphery of the gun barrel is covered, and then bolts are tightened at multiple locations between the flanges to tighten the heat pipe. The jacket is tightly fastened so that it is in close contact with the gun barrel on its 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 arranged adjacent to each other on the gun barrel, so that the adjacent heat jackets can be bonded together by the recoil impact or heat cycle during firing. Direct collision is prevented, and the buffering effect prevents excessive stress from being applied to the sealed envelope of the heat pipe, thereby protecting the safety of the heat pipe heating 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 heat jacket, and since solar heat directly enters the heat jacket 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 effects.

[Purpose of the Invention] The present invention has been made in consideration of the above points, and is intended to improve the heat pipe heat-forming jacket of the conventional configuration, and to further improve the results of improving shooting accuracy by equipping the heat jacket. The purpose of the present invention is to provide a heat pipe type heat envelope device with high uniformity of heat and heat dissipation performance. Summary of the Invention In order to achieve the above object, the present invention provides heat pipe heating jackets that are arranged side by side on the gun barrel, and the outer periphery of each heat pipe heating jacket is covered and the circumferential surface of the heating jacket is By installing a sunshade cover that forms a space between the gun barrel and the air convection passage, the sunshade cover prevents direct solar radiation from being applied to the heat cladding and minimizes the intrusion of solar heat. At the same time, the space between the sunshade cover and the heat jacket is used as a natural convection path for air, and the air flow passing through this space improves the heat dissipation effect of the heat generated by shooting. This is to make it even higher.

[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 Fig. 3 is a mounting of the heat pipe heat jacket on the gun barrel. It is a diagram showing the state, and the same members as in FIGS. 4 and 5 are given the same reference numerals. In other words, the inner cylinder 5. Outer cylinder 6. A heat pipe heating jacket 4 with a C-shaped cross section, consisting of a ring flange 7°, a wick 8, etc.
On the other hand, a tensile flange 11 is welded to both sides of the notch on the lower surface side, and a disc spring 1 is inserted between the tensile iron 12 inserted into this flange 11.
3 and fastening bolts 14,
The heat jacket 4 is firmly fixed to the gun barrel 2. According to the present invention, a sunshade cover indicated 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. Moreover, a large number of ventilation holes 17 that communicate between the inside and outside are distributed and opened on the circumferential surface thereof. 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 tensile flange 11. Air vent 1
7 is formed by locally cutting the cover 15 and press-working the cut portion to bulge inward. 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 of the gun barrel, etc., the outer peripheral surface of the heat pipe heating jacket 4 uses the space 16 between it and the sunshade cover 15 described above as an air convection path. Vent hole 17 as shown at P
Low-temperature outside air flows through the barrel due to the chimney effect, absorbing the heat generated by the gun barrel and radiating the heat outward. 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 its 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, a sunshade cover is provided for each heat pipe heating jacket that covers the outer periphery of the heat jacket and forms a space between it and the circumferential surface of the heat jacket that serves as an air convection passage. This prevents solar heat from directly entering the heat pipe heating jacket, while at the same time using the space between the heat jacket and the sunshade cover as an air convection path to absorb the heat generated by the shot. It is now possible to effectively reduce the temperature rise of the gun barrel and heat pipe heat jacket by dissipating heat outward, thus improving the uniformity and heat dissipation performance of the heat pipe type heat jacket, 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 heating jacket according to an embodiment of the present invention, and FIG.
-n sectional view, Fig. 3 is a side view showing the state in which the heat jacket shown in Fig. 1 is mounted on the gun barrel, Fig. 4 is a conventional configuration diagram corresponding to Fig. 3, and Fig. 5 is a In Figure 0, which is a partially enlarged sectional view showing the detailed structure of the heat jacket in the figure, 2: Gun barrel, 4: Heat pipe type heat jacket, 15: Sunshade cover, 16: Space, 17: Ventilation hole. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] 1) A heat pipe type heat casing that is divided into a plurality of pieces along the longitudinal direction of the gun barrel and is mounted side by side on the outer periphery of the gun barrel to equalize the temperature of the gun barrel and dissipate heat. In the device,
A heat pipe type heat cladding characterized in that each heat pipe type heat cladding is provided with a sunshade cover that covers the outer periphery of the heat cladding and forms a space serving as an air convection passage between the heat cladding and the circumferential surface of the heatpipe type heat cladding. Device. 2) In the heat envelope device according to claim 1,
A heat pipe type thermal envelope device characterized in that ventilation holes communicating between the inside and outside of the sunshade cover are distributed on the circumferential surface of the sunshade cover.