Heat pipe sealing device utilizing heating power to vacuumize

Abstract

The utility model discloses a heat pipe sealing device utilizing heat power to vacuumize, and relates to a heat pipe sealing device. Comprising a resistance furnace, a thermocouple and a furnace temperature control cabinet, the thermocouple is inserted into a furnace core of the resistance furnace, the furnace temperature control cabinet is in control connection with the resistance furnace, the top of the resistance furnace clamps a heat pipe extending into the resistance furnace through a heat pipe clamping device, a heat pipe filling opening is formed in the top of the heat pipe, and a sealing bead is placed at the bottom in the heat pipe filling opening. A reverse thread connector is arranged on the outer wall of the top of the heat pipe filling opening and connected with a vacuum sealing device, a forward thread is further arranged in the reverse thread connector, and the vacuum sealing device is connected with a pressure monitoring device. According to the utility model, the working medium steam inside the heat pipe is utilized to extrude non-condensable air, and when the steam is condensed to generate vacuum, the low-temperature heat pipe which has low requirement on vacuum degree does not need a vacuum pump and matched vacuumizing equipment, but fully utilizes the test resistance furnace, so that the investment can be reduced, the cost is saved, and the operation is convenient, simple and practical.

Description

Technical Field

[0001] The utility model relates to a heat pipe sealing device, in particular to a heat pipe sealing device which utilizes thermal vacuum extraction. Background Art

[0002] As we all know, heat pipes are currently used in more and more fields as the most effective temperature-averaging elements. The vacuum sealing of heat pipes is the most important step in the manufacturing process of heat pipes. If it is not done well, the heat pipes will become scrap. Generally, heat pipes need to be inserted into vacuum equipment for vacuuming, and the sealing mechanism needs to seal the heat pipes under the vacuum equipment. Therefore, the interval between the vacuum end and the sealing end of the heat pipe is large, and the part after the sealing end of the heat pipe needs to be removed in the subsequent process, which will cause waste of pipes. In addition, the commonly used heat pipe sealing process generally uses cold welding pliers or molds to press the heat pipes tightly and then uses resistance welding or electrode welding for welding. The above sealing has certain defects: once the sealing fails, the heat pipe will become scrap and cannot be repaired again; the cold welding sealing method is extremely fragile and cannot withstand collision and impact; and once the pressure in the pipe is slightly higher, the pipe mouth may break. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model aims to provide a heat pipe sealing device that utilizes thermal vacuum extraction, utilizes the working medium steam inside the heat pipe to squeeze out non-condensable air, and generates a vacuum when the steam condenses. For low-temperature heat pipes that do not require high vacuum degree, there is no need for a vacuum pump and supporting vacuum extraction equipment, but instead full use is made of a test resistance furnace, which can reduce investment and save costs, and is convenient, simple and practical to operate.

[0004] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical scheme: a heat pipe sealing device using thermal vacuum extraction, including a resistance furnace, a thermocouple and a furnace temperature control cabinet, the thermocouple is inserted into the furnace core of the resistance furnace, the furnace temperature control cabinet is connected to the resistance furnace control, the top of the resistance furnace is clamped by a heat pipe clamping device for clamping the heat pipe extending into the resistance furnace, a heat pipe filling port is arranged on the top of the heat pipe, a sealing bead is placed at the bottom of the heat pipe filling port, a reverse wire joint is arranged on the outer wall of the top of the heat pipe filling port, the reverse wire joint is connected to the vacuum sealing device, a straight wire is also arranged in the reverse wire joint, and the vacuum sealing device is connected to a pressure monitoring device.

[0005] Preferably, the vacuum sealing device comprises a lower connecting pipe, a lower ball valve, an intermediate pipe, an upper ball valve and an exhaust pipe, wherein the lower connecting pipe is an inner reverse thread, and four clamping strips are welded on the upper part of the lower connecting pipe near the upper part of the inner reverse thread, and the clamping strips are clamped with the sealing screws, the upper end of the lower connecting pipe is connected to one end of the lower ball valve through an external thread, the other end of the lower ball valve is connected to the lower end of the intermediate pipe, the middle part of the intermediate pipe is connected to the pressure detection device through a tee, the upper part of the intermediate pipe is connected to the upper ball valve through an external thread, and the upper end of the upper ball valve is connected to the exhaust pipe.

[0006] Preferably, the pressure monitoring device comprises a stop valve, a pressure gauge, a safety valve and a connecting pipe, wherein the connecting pipe is connected to the intermediate pipe, and the stop valve, the pressure gauge and the safety valve are sequentially arranged on the connecting pipe.

[0007] Preferably, the bottom of the heat pipe filling port is a tapered hole structure.

[0008] The utility model resistance furnace is used to heat the vacuum heat pipe with added working fluid; the thermocouple probe is inserted into the furnace core to detect the real-time temperature of the resistance furnace; the furnace temperature control cabinet is used to control the temperature of the resistance furnace; the heat pipe clamping device is used to clamp the vacuum-filled and sealed heat pipe; the heat pipe filling port is processed from a hollow short tube, and the inside of the lower end of the short tube is processed into a tapered hole, which is larger at the top and smaller at the bottom, and has a smooth surface. The sealing bead is put in from the top and can fit well with the inner wall without falling out. The upper end of the short tube must be threaded inside and outside, the inside is straight thread for tightening the sealing screws, and the outside is reverse thread for connecting the filling vacuum device. The short tube passes through the center hole of the heat pipe end cover, and the middle part is firmly welded to the heat pipe end cover, and there will be no steam leakage under high pressure.

[0009] The sealing bead of the utility model is equivalent to a one-way valve during the vacuuming process. After the filling is completed, the sealing bead is screwed in and compressed by the stud, which is more tight than a simple thread seal. The sealing screw is used for the final sealing after the heat pipe is filled. Reverse thread joint: The reverse thread joint on the outer wall of the filling port is used to connect the filling vacuuming device. The purpose of making the reverse thread is to tighten the sealing screw while unscrewing the filling vacuuming device at the end.

[0010] The screw clamp of the utility model is used to clamp the sealing screw, and the screw is screwed into the filling port when the vacuum sealing port is screwed out in the reverse direction. The lower ball valve and the upper ball valve are used to block the gas flow in the heat pipe. The exhaust port is used to discharge the air and working fluid steam in the pipe. The stop valve is used to block the gas flow of the pressure measuring tube; the pressure gauge is used to monitor the pressure change of the working fluid in the pipe. The safety valve prevents the working fluid steam in the pipe from overpressure during the filling process.

[0011] The utility model has the following beneficial effects:

[0012] The utility model adopts a heat pipe vacuum sealing method of sealing screws and sealing beads, which mainly uses the sealing beads and the pressure difference between the inside and outside of the pipe to prevent air from entering the heat pipe, and the secondary sealing of the screw thread makes the heat pipe seal more firm and reliable. This can reduce the investment in equipment such as cold welding pliers, resistance welding or electrode welding, and at the same time is firm and reliable, without the risk of seal breaking and leakage, and can also reduce pipe waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is described in detail below with reference to the accompanying drawings and specific implementation methods;

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 for Figure 1 A magnified schematic diagram of part A. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0017] Reference Figure 1-2 The present specific implementation adopts the following technical scheme: a heat pipe sealing device using thermal vacuum pumping, comprising a resistance furnace 1, a thermocouple 2 and a furnace temperature control cabinet 3, the thermocouple 2 is inserted into the furnace core of the resistance furnace 1, the furnace temperature control cabinet 3 is controlled and connected with the resistance furnace 1, the top of the resistance furnace 1 is clamped by a heat pipe clamping device 4 for clamping a heat pipe 5 extending into the resistance furnace 1, the top of the heat pipe 5 is provided with a heat pipe filling port 6, a sealing bead 7 is placed at the bottom of the heat pipe filling port 6, a reverse wire joint 8 is provided on the outer wall of the top of the heat pipe filling port 6, the reverse wire joint 8 is connected to the vacuum sealing device, a straight wire is also arranged in the reverse wire joint 8, and the vacuum sealing device is connected to the pressure monitoring device.

[0018] It is worth noting that the vacuum sealing device includes a lower connecting pipe 9, a lower ball valve 10, an intermediate pipe 11, an upper ball valve 12 and an exhaust pipe 13. The lower connecting pipe 9 is an inner reverse thread. Four clamping strips 14 are welded near the upper part of the inner reverse thread of the lower connecting pipe 9. The clamping strips 14 are clamped with the sealing screws 15. The upper end of the lower connecting pipe 9 is connected to one end of the lower ball valve 10 through an outer thread. The other end of the lower ball valve 10 is connected to the lower end of the intermediate pipe 11. The middle of the intermediate pipe 11 is connected to the pressure detection device through a tee. The upper part of the intermediate pipe 11 is connected to the upper ball valve 12 through an outer thread. The upper end of the upper ball valve 12 is connected to the exhaust pipe 13. Before formal use, after the vacuum sealing device is assembled and installed, it is necessary to use standard unified external hexagonal sealing screws for repeated testing to ensure that it can smoothly pass through the two ball valves of the vacuum sealing device and be clamped into the screw clamping strip without too much gap to meet the use standard.

[0019] It is worth noting that the pressure monitoring device includes a stop valve 16, a pressure gauge 17, a safety valve 18 and a connecting pipe 19. The connecting pipe 19 is connected to the intermediate pipe 11, and the stop valve 16, the pressure gauge 17 and the safety valve 18 are arranged on the connecting pipe 19 in sequence. The stop valve is used to block the working fluid gas from entering the pressure measuring tube. The pressure gauge is used to monitor the pressure change during the heating process of the heat pipe working fluid. The safety valve is used as a pressure safety protection during the vacuum sealing process. When the set pressure is exceeded, it can automatically open the exhaust pressure relief to prevent overpressure. The connecting pipe connects the heat pipe gas to the pressure monitoring device and connects the stop valve, pressure gauge and safety valve.

[0020] In addition, the bottom of the heat pipe filling port 6 is a tapered hole structure.

[0021] The resistance furnace of this specific embodiment mainly uses the heat energy generated by the electric current passing through the resistance material to heat the working fluid in the heat pipe to generate working fluid steam. Different working fluids have different vaporization temperatures, so it is necessary to add a thermocouple to monitor the temperature in the furnace, and the furnace temperature controller compares the feedback temperature in the furnace measured by the thermocouple with the set target temperature to control the start and stop of the resistance furnace heating source or adjust the heating power so that the furnace temperature always fluctuates within the set temperature range. The size of the resistance furnace and its matching furnace temperature controller design can be determined according to the size of the heat pipe to be produced.

[0022] The heat pipe clamping device is composed of two arc-shaped clamping blocks and a bracket. The heat pipe with a diameter of 5mm-89mm can be clamped by replacing the clamping blocks. It is mainly used to fix the heat pipe during the filling and vacuuming process.

[0023] Embodiment 1: The implementation process of this embodiment is as follows: First, install the heat pipe that needs to be filled and vacuum-sealed and has welded the filling port on the heat pipe clamping device according to the designed height and clamp it, meter the treated liquid working medium and inject it into the heat pipe, then install the sealing ball into the filling port, install the vacuum sealing device and tighten it counterclockwise. Then open the lower ball valve and upper ball valve of the vacuum sealing device, and open the stop valve of the pressure monitoring device.

[0024] After the preparation work is completed, set the target temperature of the resistance furnace, turn on the resistance furnace to heat up, and when the temperature rises to the vaporization temperature of the working fluid in the heat pipe, the working fluid changes from liquid to vapor. Because the density of the steam generated by the vaporization of the working fluid is greater than the density of the non-condensable air, the generated working fluid steam will lift up the sealing ball and gradually squeeze the non-condensable air out of the tube. As the working fluid temperature gets higher and higher, the working fluid vaporization will become more and more intense, and the remaining air in the tube will become less and less. After exhausting steam for 5-8 seconds, turn off the resistance furnace and close the upper ball valve, and use the residual heat in the furnace to maintain the working fluid pressure in the tube (the specific pressure holding value is related to the type of working fluid, the size of the tube diameter, etc.).

[0025] After closing the upper ball valve, observe the pressure gauge. When the pressure rises very slowly, close the lower ball valve and open the upper ball valve. When the pressure in the pipe is exhausted, quickly insert the sealing screw (thread facing down, cap facing up) from the exhaust port and close the upper ball valve. Then slowly open the lower ball valve, so that the screw passes through the lower ball valve and falls into the lower connecting pipe of the vacuum sealing device. The outer hexagonal cap of the screw will just fit into the screw clamping strip of the lower connecting pipe, and the thread is just aligned with the filling port. At this time, slowly turn the vacuum sealing device clockwise. When it is screwed to the half-thread position, in order to ensure safety, open the upper ball valve to discharge the residual pressure in the pipe, and finally quickly unscrew the vacuum sealing device clockwise (that is, tighten the sealing screw), and then use a wrench to check the sealing screw and tighten it completely without leaking. In this way, the entire vacuum sealing process is completed.

[0026] The above is the first embodiment of the utility model. Appropriate changes can be made on the basis of this embodiment to achieve the same effect. For example, a bypass valve is added to the middle tube of the vacuum sealing device, and an external vacuum pump is connected to the vacuum pump, instead of using the thermal method described in the new invention to draw the vacuum, which is also within the scope of protection of the utility model.

[0027] It should be noted that the heat pipe sealing device using thermal vacuum extraction in the utility model is only applicable to heat pipes whose working fluid is non-toxic, harmless, non-flammable and non-explosive. Other working fluids may cause dangerous accidents.

[0028] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A heat pipe sealing device utilizing thermal vacuuming, characterized in that: The invention comprises a resistance furnace (1), a thermocouple (2) and a furnace temperature control cabinet (3), wherein the thermocouple (2) is inserted into the furnace core of the resistance furnace (1), the furnace temperature control cabinet (3) is connected to the resistance furnace (1) by control, the top of the resistance furnace (1) clamps a heat pipe (5) extending into the resistance furnace (1) through a heat pipe clamping device (4), the top of the heat pipe (5) is provided with a heat pipe filling port (6), the bottom of the heat pipe filling port (6) is provided with a sealing bead (7), the top outer wall of the heat pipe filling port (6) is provided with a reverse wire joint (8), the reverse wire joint (8) is connected to a vacuum sealing device, a parallel wire is also provided in the reverse wire joint (8), and the vacuum sealing device is connected to a pressure monitoring device.

2. The heat pipe sealing device using thermal vacuuming according to claim 1, characterized in that: The vacuum sealing device comprises a lower connecting pipe (9), a lower ball valve (10), an intermediate pipe (11), an upper ball valve (12) and an exhaust pipe (13). The lower connecting pipe (9) is an inner reverse thread. Four clamping strips (14) are welded near the upper part of the inner reverse thread of the lower connecting pipe (9). The clamping strips (14) are clamped with a sealing screw (15). The upper end of the lower connecting pipe (9) is connected to one end of the lower ball valve (10) through an external thread. The other end of the lower ball valve (10) is connected to the lower end of the intermediate pipe (11). The middle part of the intermediate pipe (11) is connected to a pressure detection device through a tee. The upper part of the intermediate pipe (11) is connected to the upper ball valve (12) through an external thread. The upper end of the upper ball valve (12) is connected to the exhaust pipe (13).

3. The heat pipe sealing device using thermal vacuuming according to claim 2, characterized in that: The pressure monitoring device comprises a stop valve (16), a pressure gauge (17), a safety valve (18) and a connecting pipe (19); the connecting pipe (19) is connected to the intermediate pipe (11); and the stop valve (16), the pressure gauge (17) and the safety valve (18) are arranged in sequence on the connecting pipe (19).

4. The heat pipe sealing device using thermal vacuuming according to claim 1, characterized in that: The bottom of the heat pipe filling port (6) is a tapered hole structure.

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