KR20000030135A - High quality heat transfer tube and its manufacturing method - Google Patents

Abstract

PURPOSE: A heat transfer tube is provided to improve the durability and to increase the optimum heat transfer speed and the amount of heat transfer. CONSTITUTION: A heat transfer tube is obtained by: welding an opening(22) of a particularly molded hemispherical-hole-shaped pipe(21) and forming a hemispherical-hole-shaped injection hole(23); maintaining the vacuum in the pipe about 10-14 torr by absorbing internal air with an air absorber through the injection hole; injecting a heat transfer composition into the pipe by employing a filling machine of a heat medium; pressurizing, sealing and cutting the injection hole; and sealing a pressurization part(24).

Description

High quality heat transfer tube and its manufacturing method {.}

The present invention relates to a heat transfer tube having a structure in which the heat transfer medium composition is sealed in a vacuum state and a method of manufacturing the same, and in particular, the heat transfer medium composition in the sealed structure can be loaded in a predetermined optimal state, The shape of the joint is hemispherical to avoid the pressure concentration of the vapor pressure of the internal heat transfer medium, and the inside of the pipe is kept in a vacuum state, and then the heat transfer medium is charged for durability and optimal heat transfer rate and high heat transfer amount. The invention of a high quality heat transfer tube and its manufacturing method is an object of the present invention.

Heat transfer tubes are made of copper and stainless steel or aluminum pipes in which the heat transfer medium (alcohols, distilled water, acetone, freon, etc.) suitable for the temperature of use is vacuum sealed in an appropriate amount of medium in the pipe by about 1 to 50% of the volume in the pipe. In the form of its operation, it is shown that when a heat source is provided on one side of a sealed heat transfer tube, a heat medium composition having a phase equilibrium in a gaseous liquid and gaseous state is vaporized by a heat source to a high medium pressure state. Heat is transferred rapidly to the non-heating portion (condensation) in the pipe at the speed of sound, and the heat-transfer medium vapor that has moved to this non-heating portion turns into a liquid phase, releasing the latent heat of the heat medium composition outside the pipe, and then gravity or wick It has the form of a continuous closed loop that circulates to the site of heat source again by capillary force. The enemy flew rooms are available in a variety of heat exchangers and components for electrical and electronic components cooled by a heat exchanger role with a fast rate of heat transfer.

Patents for such heat transfer tubes are described in Korean Patent Publication 93-5043. The prior art for such heat transfer tubes involves welding the end face in a flat form on both sides of the pipe, loading the transfer medium in an unstable state in the form of a normal syringe, and then operating the vacuum pump to keep the interior in vacuum while It is manufactured by welding the hole of the finishing plug with the small hole so that the vacuum can be removed.

This conventional technique cannot achieve an optimum degree of vacuum by charging a heat medium in a pipe and then operating a vacuum pump to reach the vacuum in the pipe, and the air in the pipe is sucked with the vapor of the heat transfer medium. It is not possible to quantify the thermal medium composition.

In addition, it is difficult to maintain a certain quality because the amount of the heat transfer medium is different by the ambient environment, such as temperature and humidity, and the sucked heat medium composition is sucked into the manufacturing apparatus and the vacuum pump, so there is a problem in durability of the manufacturing apparatus. The device is prematurely worn and the end cap of the pipe is flat, and the contact surface between the pipe and the end cap is large.There are many welding sites, so there is a possibility of air intake after welding and the contact angle of the pipe and the end plug is perpendicular. As the steam pressure is concentrated in this part and the use time becomes longer, there is a problem in that the vacuum is broken and the function as a heat transfer tube cannot be performed.

In addition, the conventional technology cannot obtain a high quality product by affecting the internal vacuum system due to the gas generated in the process of melting the electrode during welding by welding the injection hole portion in the vacuum state.

The present invention is to supplement the conventional technology, while the one end of the pipe to form a hemispherical pipe opening having a hole of 1 to 5 millimeters after the welding after finishing the molding and the other opening in the same way After making the hemispherical injection hole, insert the injection hole of the pipe into the air suction device to suck air to have a vacuum degree of 10 -4 Torr in the pipe, and then charge the prepared heat transfer composition using the filling device, and then The upper part of the ball is cut under pressure sealing using a press machine, and the cut part is welded under pressure again to obtain a final product.

.

Hereinafter, the gist of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the structure of a conventional heat transfer tube.

Flat ends 3 and 4 are welded to both ends 2 and 3 of the pipe 1, and the heat transfer composition 6 is injected into the pipe through the injection hole 5 installed through the center of the upper stopper 3, and then the vacuum pump is applied through the injection hole 5. It is according to the prior art made by sealing the injection hole 7 while aspirated to make a vacuum state.

Figure 2 shows the structure of a heat transfer tube manufactured by the present invention, which welds one end 22 of a pipe 21 in the form of a specially shaped 1 to 5 mm hemispherical hole and finishes another side of the 1 to 5 mm hemispherical hole. The injection hole of the shape was formed and the air was drawn through the injection hole 23 through the injection hole to inject the heat transfer composition using the heating medium filling device into the pipe while maintaining the vacuum degree in the pipe of 10 -4 Torr. After cutting the pressure seal, the pressing part 24 is welded and sealed in a pressurized state to be completed. Referring to FIG.

Of the third degree

(A) shows the structure of the pipe 21 which cut out the cut pipe, and the hole part 23 of the lower surface is drawn to have an inner diameter of 1 to 5 mm, and the upper injection hole part is drawn to have an inner diameter of 1 to 5 mm. Molded.

In (B), the bottom hole 22 is formed of a complete weld seal 26 made of the same or similar material as the pipe.

In (c), the upper part of the pipe with the injection hole is heated between the air absorber and the heat medium injection primary valve 37 and the secondary valve 38 so that the heat medium injection device filled with the appropriate amount of heat transfer medium 39 is in communication with the guide tube 40. With the primary valve 37 closed, open the air suction valve 41 and start the vacuum unit with the vacuum pump to draw the internal air until the vacuum inside the pipe reaches 10 -4 Torr, then close the air suction valve 41 While maintaining the degree of vacuum, the appropriate amount of the selected heat transfer composition was maintained while the heat medium injection valve 38 was closed while the heat transfer valve 37 was closed. To make it flow.

In (d), the pipe 21 inserted by the guide tube 40 is pressurized by the upper end of the pipe injection hole by using the press machine 42 integrated with the air suction and heat medium injection device to form a seal 43, and then the air suction and heat medium The injection device guide tube 40 was separated.

(E) In the air, the upper end of the copper pipe injection hole formed by the pressing portion 43 is pressurized in the press machine 45 again in the air, and the press-cutting portion is made of the same or similar material as the pipe 46 using the welding flame 45. Weld seal 47 to obtain the desired high vacuum, high quality pipe.

The pressurization portion 43 formed here is intended to prevent the airtightness from being destroyed by refilling the pipe with the same or similar material by the welding flame.

.

Claims (4)

After the lower part is welded using a drawing pipe with minute holes at both ends, air is sucked out, and the upper hemispherical injection hole is brought into close contact with the heating medium injection device, and the air is sucked out so that the inside of the pipe is in a vacuum state of about 10 -4 torr. A heat pipe manufactured by charging a heat transfer composition in an appropriate amount by using a filling device and then welding under pressure using a press machine. Equipped with a press machine, the air suction device capable of drawing air at a degree of vacuum of about 10 -4 torr and the filling device that can quantitatively introduce liquid into the pipe in a vacuum state are fixed to the pipe to inject and press the heat transfer composition after air extraction. High quality heat transfer tube making machine which can be pressurized and sealed by machine. According to claim 1, wherein the foot pipe is formed in a hemispherical shape at one end of one end, and another opening at both ends has a minute hole of 1 to 5mm. The method of claim 2, wherein the filling device is secured to a portion of the air bleeding device having a passageway in communication with the filling port, thereby forming a seal in the heat transfer tube and the stop surface, and discharging the heat transfer tube through the filling port and passageway. Filling the selected heat medium through the passage and the charging port and closing the charging port.