阅读说明：本技术 一种烧结毛细热管的制备工艺 (Preparation process of sintered capillary heat pipe ) 是由 韩飞 殷言康 于 2021-07-24 设计创作，主要内容包括：本发明提供的一种烧结毛细热管的制备工艺,包括如下步骤：将长管裁切成符合长度要求的管体,将管体的尾端通过旋压工艺进行平面封口,向管体内灌入聚乙烯醇溶液,将管体放入烧结炉进行烧结,在端盖靠近抽气管的一端插入焊环,通过高频焊接将端盖和抽气管焊接为一体,将端盖插入至管体的头部并进行钎焊,将液体从管体头部注入,用真空除气设备将管体内腔的空气抽出,用定长设备将抽气管进行剪切,将抽气管进行密封。本发明的热管制备工艺使用聚乙烯醇溶液不仅省去定制芯棒的成本且烧结毛细均匀分布在管体内壁,极大提高热管的使用性能；通过利用旋压工艺将管体的尾端进行封口,不仅制作过程简单且成本得到有效降低。(The invention provides a preparation process of a sintered capillary heat pipe, which comprises the following steps: the method comprises the following steps of cutting a long pipe into a pipe body meeting the length requirement, carrying out plane sealing on the tail end of the pipe body through a spinning process, pouring a polyvinyl alcohol solution into the pipe body, putting the pipe body into a sintering furnace for sintering, inserting a welding ring into one end, close to an exhaust pipe, of an end cover, welding the end cover and the exhaust pipe into a whole through high-frequency welding, inserting the end cover into the head of the pipe body and brazing, injecting liquid from the head of the pipe body, pumping air in an inner cavity of the pipe body out through vacuum degassing equipment, shearing the exhaust pipe through fixed-length equipment, and sealing the exhaust pipe. The heat pipe preparation process of the invention uses the polyvinyl alcohol solution, so that the cost of customizing the core rod is saved, the sintering capillaries are uniformly distributed on the inner wall of the pipe body, and the service performance of the heat pipe is greatly improved; the tail end of the pipe body is sealed by using a spinning process, so that the manufacturing process is simple and the cost is effectively reduced.)

1. A preparation process of a sintered capillary heat pipe is characterized by comprising the following steps: the method comprises the following steps:

1) cutting the long pipe into a pipe body meeting the length requirement;

2) carrying out plane sealing on the tail end of the pipe body through a spinning process;

3) pouring polyvinyl alcohol solution into the pipe body, pouring out the polyvinyl alcohol solution, and pouring copper powder into the pipe body, and pouring out the copper powder;

4) putting the pipe body adhered with the copper powder into a sintering furnace for sintering;

5) inserting a welding ring at one end of the end cover close to the exhaust pipe, and welding the end cover and the exhaust pipe into a whole through high-frequency welding;

6) coating a circle of solder at the joint of the end cover and the pipe body, inserting the end cover into the head of the pipe body and brazing;

7) injecting liquid into the inner cavity of the tube body from the exhaust tube;

8) pumping out air in the inner cavity of the tube body by using vacuum degassing equipment;

9) shearing the exhaust pipe by using fixed length equipment;

10) and sealing the sheared exhaust tube by argon arc welding.

2. The process according to claim 1, wherein the sintering step comprises the following steps: and in the step 2), degreasing and cleaning the spun pipe body.

3. The process according to claim 1, wherein the sintering step comprises the following steps: the preparation process of the polyvinyl alcohol solution in the step 3) is as follows: adding high-viscosity medical polyvinyl alcohol into distilled water at 100 ℃ for dissolving, wherein the mass ratio of the polyvinyl alcohol to the distilled water is 1: 100.

4. The process according to claim 1, wherein the sintering step comprises the following steps: in the step 4), the temperature in the sintering furnace is 950 ℃, and the sintering time is 3H.

5. The process according to claim 1, wherein the sintering step comprises the following steps: and in the step 5), annealing and reducing the end cover and the exhaust tube after high-frequency welding.

6. The process according to claim 1, wherein the sintering step comprises the following steps: in the step 5), the end cover and the exhaust pipe are made of oxygen-free copper materials.

7. The process according to claim 1, wherein the sintering step comprises the following steps: the brazing temperature in the step 6) is 650 ℃, and the welding time is 0.5H.

8. The process according to claim 1, wherein the sintering step comprises the following steps: and after the step 10), screwing the exposed exhaust pipe into the end cover.

Technical Field

The invention relates to a preparation process of a heat pipe, in particular to a preparation process of a sintered capillary heat pipe.

Background

A heat pipe, also called a heat pipe, is a heat transfer element with a rapid temperature equalization characteristic, and is generally used for LED heat transfer. The technical process for manufacturing the heat pipe in the current market is generally to weld and seal a pipe body and end covers through welding flux melting, the inner capillary is sintered by a core rod, the core rod needs to be customized according to different product requirements, the cost is high, dust is not uniformly distributed in the sintering process of the core rod, the sintered capillary is easily eccentric, and therefore the problems of poor performance, short service life and the like caused by nonuniform capillary are solved.

Disclosure of Invention

The invention aims to provide a preparation process of a sintered capillary heat pipe, which aims to solve the technical problems in the background technology.

In order to achieve the above purpose, the invention provides a preparation process of a sintered capillary heat pipe, which comprises the following steps:

1) cutting the long pipe into a pipe body meeting the length requirement;

2) carrying out plane sealing on the tail end of the pipe body through a spinning process;

3) pouring polyvinyl alcohol solution into the pipe body, pouring out the polyvinyl alcohol solution, and pouring copper powder into the pipe body, and pouring out the copper powder;

4) putting the pipe body with the copper powder adhered to the inner wall into a sintering furnace for sintering;

5) inserting a welding ring at one end of the end cover close to the exhaust pipe, and welding the end cover and the exhaust pipe into a whole through high-frequency welding;

6) coating a circle of solder at the joint of the end cover and the pipe body, inserting the end cover into the head of the pipe body and brazing;

7) injecting liquid into the inner cavity of the tube body from the head part of the tube body;

8) pumping out air in the inner cavity of the tube body by using vacuum degassing equipment;

9) shearing the exhaust pipe by using fixed length equipment;

10) and sealing the sheared exhaust tube by argon arc welding.

Further, in the step 2), the spinning pipe body is subjected to oil removal cleaning.

Further, the preparation process of the polyvinyl alcohol solution in the step 3) comprises: adding high-viscosity medical polyvinyl alcohol into distilled water at 100 ℃ for dissolving, wherein the mass ratio of the polyvinyl alcohol to the distilled water is 1: 100.

Further, in the step 4), the temperature in the sintering furnace is 950 ℃, and the sintering time is 3H.

Further, in the step 5), annealing reduction treatment is performed on the end cover and the exhaust tube after high-frequency welding.

Further, in the step 5), the end cover and the exhaust pipe are made of oxygen-free copper materials.

Further, the brazing temperature in the step 6) is 650 ℃, and the welding time is 0.5H.

Further, after the step 10), screwing the exposed exhaust tube into the end cover.

Compared with the prior art, the heat pipe preparation process is different from the conventional heat pipe preparation process on the market, copper powder is adhered to the inner wall of the pipe body by utilizing the viscosity of the polyvinyl alcohol solution, the polyvinyl alcohol solution is evaporated after high-temperature sintering, and the copper powder is uniformly distributed on the inner wall of the pipe body at the moment; the tail end of the pipe body is sealed by using a spinning process, so that the manufacturing process is simple and the cost is effectively reduced compared with the conventional method of welding end covers at two ends of the pipe body; the exposed exhaust pipe is screwed into the end cover, so that interference during product assembly can be effectively avoided.

Drawings

FIG. 1: the preparation process flow chart of the invention;

FIG. 2: the end cover of the invention has a structural schematic diagram;

FIG. 3: the final finished product of the heat pipe is shown.

Reference numerals:

1. a pipe body; 2. an end cap; 3. an air exhaust pipe; 4. and (7) welding a ring.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-3, the present invention is a manufacturing process of a sintered capillary heat pipe, including the following steps:

1) cutting the long pipe into a pipe body 1 meeting the length requirement according to the actual use requirement;

2) the tail end of the cut pipe body 1 is subjected to plane sealing through a spinning process, and the spun pipe body 1 is subjected to oil removal cleaning, so that the product cleanliness can be improved, and the brazing operation in the step 6) is facilitated;

3) adding high-viscosity medical polyvinyl alcohol into distilled water at 100 ℃ for dissolving, wherein the mass ratio of the polyvinyl alcohol to the distilled water is 1:100, pouring a polyvinyl alcohol solution into the tube body 1 due to the high viscosity of the polyvinyl alcohol solution, pouring the polyvinyl alcohol solution out, pouring copper powder into the tube body 1, and sticking a powder layer by the polyvinyl alcohol solution in the tube body 1;

4) sintering the pipe body 1 adhered with the copper powder in a sintering furnace, wherein the temperature in the sintering furnace is 950 ℃, the sintering time is 3H, the polyvinyl alcohol solution is evaporated after the high-temperature sintering, and the copper powder is uniformly distributed on the inner wall of the pipe body 1;

5) the end cover 2 and the exhaust tube 3 are made of oxygen-free copper materials, a welding ring 4 is inserted into one end, close to the exhaust tube 3, of the end cover 2, the end cover 2 and the exhaust tube 3 are welded into a whole through high-frequency welding, and due to the fact that the surface of a product can be oxidized and blackened after the high-frequency welding, the end cover 2 and the exhaust tube 3 after the high-frequency welding are subjected to annealing reduction treatment, ductility and toughness can be improved, and meanwhile the attractive appearance can be guaranteed;

6) coating a circle of solder at the joint of the end cover 2 and the pipe body 1, inserting the end cover 2 into the head of the pipe body 1 and brazing, wherein the brazing temperature is 650 ℃, the welding time is 0.5H, taking out a product after the temperature is reduced after the brazing is finished, and at the moment, welding the end cover 2, the exhaust pipe 3 and the pipe body 1 into a whole;

7) calculating the liquid injection amount according to the capillary in the pipe body 1, and injecting the liquid into the inner cavity of the pipe body 1 from the head of the pipe body 1;

8) pumping out air in the inner cavity of the tube body 1 by using vacuum degassing equipment;

9) shearing the exhaust tube 3 by using fixed length equipment;

10) and sealing the sheared exhaust tube 3 through argon arc welding, and screwing the exposed exhaust tube 3 into the end cover 2.

Compared with the prior art, the heat pipe preparation process is different from the conventional heat pipe preparation process on the market, copper powder is adhered to the inner wall of the pipe body by utilizing the viscosity of the polyvinyl alcohol solution, the polyvinyl alcohol solution is evaporated after high-temperature sintering, and the copper powder is uniformly distributed on the inner wall of the pipe body at the moment; the tail end of the pipe body is sealed by using a spinning process, so that the manufacturing process is simple and the cost is effectively reduced compared with the conventional method of welding end covers at two ends of the pipe body; the exposed exhaust pipe is screwed into the end cover, so that interference during product assembly can be effectively avoided.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.