Vacuum tube bundle brazing device

Abstract

The vacuum tube bundle brazing device comprises a heating temperature control system and a vacuum system connected with the heating temperature control system, a to-be-welded assembly is placed in the heating temperature control system, and the heating temperature control system comprises a lifting mechanism used for controlling the height of the to-be-welded assembly. According to the brazing device, the heating temperature control system and the lifting mechanism are adopted, so that the height of the to-be-welded assembly can be controlled, the heating temperature control system only heats and welds the to-be-welded part of the to-be-welded assembly, secondary heating of other parts is avoided, and the situation that primary welding of the to-be-welded assembly is not successful, and secondary melting and gas leakage of a welding spot are easily caused during repair welding is prevented; the method is suitable for the technical field of vacuum brazing and is used for brazing and repair welding of thin-wall pipe bundles.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum brazing, and in particular relates to a vacuum tube bundle brazing device. Background Art

[0002] Brazing refers to a welding technology that uses a brazing filler metal with a lower melting point than the welded parts, and connects the parent materials together through the molten brazing filler metal at a temperature lower than the solidus line of the parent materials but higher than the liquidus line of the brazing filler metal. Brazing can be divided into flame brazing, resistance brazing, induction brazing, arc brazing, vacuum brazing, etc. Among them, vacuum brazing refers to brazing performed by heating the workpiece in a vacuum chamber, and is mainly used for welding materials with high quality requirements or easily oxidized materials.

[0003] There are many kinds of workpieces that need vacuum brazing in the manufacturing and processing industries. Among them, the brazing of thin-walled pipe bundles with internal airtightness requirements such as gas purifiers and hydrogen purification devices is more difficult. The difficulty of brazing pipe bundles is that there are many and concentrated welding points. Usually at least two groups of head and tail must be welded, and some even have to be welded in multiple parts, which makes it difficult to weld and form in one go. If the welding is unsuccessful in one go, the overall welding during the repair welding is likely to cause secondary melting and leakage of the weld points, reducing reliability.

[0004] Therefore, there is an urgent need for a device that can improve the success rate of thin-walled pipe cluster brazing. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a vacuum tube bundle brazing device. The brazing device can control the height of the assembly to be welded by adopting a heating temperature control system and a lifting mechanism, so that the heating temperature control system only heats and welds the to-be-welded part of the assembly to be welded, avoiding secondary heating of other parts, and solving the problem of secondary melting and gas leakage of the weld point when the assembly to be welded is repaired.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a vacuum tube bundle brazing device, characterized in that it includes a heating temperature control system and a vacuum system connected to the heating temperature control system, a component to be welded is placed in the heating temperature control system, and the heating temperature control system includes a lifting mechanism for controlling the height of the component to be welded.

[0007] The above-mentioned vacuum tube bundle brazing device is characterized in that the heating temperature control system includes a tubular resistance furnace, a quartz glass furnace tube arranged in the tubular resistance furnace, and a temperature control system connected to the tubular resistance furnace, the top of the quartz glass furnace tube is vacuum-sealed with a first stainless steel flange, and the bottom of the quartz glass furnace tube is vacuum-sealed with a second stainless steel flange, the first stainless steel flange is provided with an interface for connecting to the vacuum system, the quartz glass furnace tube is used to place the components to be welded, and the heating zone of the tubular resistance furnace is provided with a thermocouple.

[0008] The above-mentioned vacuum tube bundle brazing device is characterized in that the temperature control system includes a temperature control meter and a thermocouple and a programmable controller electrically connected to the temperature control meter, and the programmable controller is electrically connected to the tubular resistance furnace and the thermocouple.

[0009] The above-mentioned vacuum tube bundle brazing device is characterized in that the quartz glass furnace tube is placed on the top of a lifting mechanism, and the lifting mechanism includes a lifting platform and a worm gear lifter fixedly connected to the bottom end of the lifting platform.

[0010] The above-mentioned vacuum tube bundle brazing device is characterized in that the observation system includes a camera and a display screen electrically connected to the camera, a bracket is fixedly connected to the camera, the bottom end of the bracket is matched with an annular bracket guide rail, and the annular bracket guide rail is fixedly connected to the top of the tubular resistance furnace.

[0011] The above-mentioned vacuum tube bundle brazing device is characterized in that the vacuum system includes a molecular pump and a mechanical pump, one end of the molecular pump is connected to the mechanical pump through a pipeline, and the other end is connected to the stainless steel flange at the top of the quartz glass furnace tube through a vacuum conduit.

[0012] The above-mentioned vacuum tube bundle brazing device is characterized in that a support frame is provided at the bottom end of the tubular resistance furnace, and a through hole for passing the quartz glass furnace tube is opened on the support frame.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. The present invention can control the height of the assembly to be welded by adopting a heating temperature control system and a lifting mechanism, so that the heating temperature control system only heats the to-be-welded part of the assembly to be welded, avoiding secondary heating of other parts, and will not cause secondary melting and leakage of the weld point and secondary heating to affect the overall strength of the assembly to be welded; at the same time, the height of the assembly to be welded can be adjusted by the lifting mechanism, and multiple sections of the same assembly to be welded can be brazed, which can be used for both overall welding and local repair welding.

[0015] 2. The present invention adopts a tubular resistance furnace as a heating mechanism and adds a temperature control system. Compared with the induction heating used in the prior art, the heating speed of the tubular resistance furnace is controllable, the heating temperature is more precise, and the components to be welded are heated evenly. This can avoid the situation where the center temperature is high and the outer edge temperature is low when the components to be welded are thin-walled tube bundle components, thereby avoiding leakage of the outer edge tube caused by the melting and spreading of the brazing material in the center area and insufficient melting of the brazing material in the outer edge area, or excessive flow of the brazing material caused by the melting and spreading of the brazing material in the outer edge area and the excessive temperature in the center area, resulting in poor welding quality of the tube bundle in the center area, thereby effectively improving the success rate of brazing of thin-walled tube bundle components.

[0016] 3. The present invention can observe the melting degree of the solder of the assembly to be welded in real time by setting an observation system. At the same time, by setting the camera on the annular bracket guide rail, the camera can be manually rotated to achieve 360° observation of the inside of the quartz glass furnace tube. After the solder is melted and spread, the heating is stopped immediately. By adjusting the lifting mechanism, the brazing part of the assembly to be welded leaves the heating zone and solidifies quickly, thereby further improving the success rate of brazing.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the brazing device of the present invention.

[0019] Figure 2 for Figure 1 A partial enlarged view of point A.

[0020] Figure 3 It is a structural block diagram of the temperature control system of the present invention.

[0021] Figure 4 It is a cross-sectional view of the bracket and the annular bracket guide rail of the present invention.

[0022] Description of reference numerals:

[0023] 1—Tube resistance furnace; 2—Quartz glass furnace tube; 2-1—First stainless steel flange;

[0024] 2-2—Second stainless steel flange; 3—Thermocouple; 4—Temperature controller;

[0025] 5—Programmable controller; 6—Lifting platform; 7—Worm gear lift;

[0026] 8—camera; 9—bracket; 10—annular bracket guide rail;

[0027] 11—display screen; 12—molecular pump; 13—mechanical pump;

[0028] 14—Pipeline; 15—Vacuum duct; 16—Support frame. DETAILED DESCRIPTION

[0029] Example 1

[0030] like Figure 1 As shown, the brazing device of this embodiment includes a heating temperature control system and a vacuum system connected to the heating temperature control system. The components to be welded are placed in the heating temperature control system, and the heating temperature control system includes a lifting mechanism for controlling the height of the components to be welded.

[0031] In actual use, in this embodiment, a heating temperature control system is provided to heat and melt the solder of the component to be welded, a vacuum system is provided to provide a vacuum environment for melting the solder, and a lifting mechanism is provided to control the height of the component to be welded, so that the heating temperature control system only heats and welds the to-be-welded parts of the component to be welded, avoiding secondary heating of other parts.

[0032] like Figure 1 As shown, further, in this embodiment, the heating temperature control system includes a tubular resistance furnace 1, a quartz glass furnace tube 2 running through the center of the tubular resistance furnace 1, and a temperature control system connected to the tubular resistance furnace 1, the top of the quartz glass furnace tube 2 is vacuum-sealed with a first stainless steel flange 2-1, and the bottom of the quartz glass furnace tube 2 is vacuum-sealed with a second stainless steel flange 2-2, the first stainless steel flange 2-1 is provided with an interface for connecting to the vacuum system, the quartz glass furnace tube 2 is used to place the components to be welded, and the heating zone of the tubular resistance furnace 1 is provided with a thermocouple 3.

[0033] In actual use, in this embodiment, by passing the quartz glass furnace tube 2 on which the component to be welded is placed through the center of the tubular resistance furnace 1, the tubular resistance furnace 1 can perform surrounding heating on the solder of the component to be welded; and compared with induction heating, the tubular resistance furnace 1 has more accurate temperature control, which can make the solder evenly heated as a whole, and the temperature accuracy is further improved in combination with the temperature control system; by vacuum-sealing stainless steel flanges at both ends of the quartz glass furnace tube 2, and at the same time providing an interface for connecting the vacuum system on the first stainless steel flange 2-1, the quartz glass furnace tube 2 can be evacuated to form a vacuum welding environment; by arranging the thermocouple 3 in the heating zone of the tubular resistance furnace 1, it is used to detect the heating temperature of the tubular resistance furnace 1.

[0034] It should be noted that, in this embodiment, the quartz glass furnace tube 2 can be moved up and down in the center of the tubular resistance furnace 1 by utilizing a lifting mechanism.

[0035] like Figure 1 and Figure 3 As shown, further, in this embodiment, the temperature control system includes a temperature control meter 4 and a thermocouple and a programmable controller 5 electrically connected to the temperature control meter 4, and the programmable controller 5 is electrically connected to the tubular resistance furnace 1 and the thermocouple 3.

[0036] In actual use, in this embodiment, by electrically connecting the temperature control meter 4 with the programmable controller 5 and the thermocouple 3, and electrically connecting the programmable controller 5 with the tubular resistance furnace 1 and the thermocouple 3, the heating temperature, heating rate and other parameters of the tubular resistance furnace 1 can be set by the programmable controller 5, and the corresponding temperature can be measured and displayed by the thermocouple 3 and the temperature control meter 4, so that the welding temperature and heating rate can be accurately controlled, thereby improving the success rate of welding.

[0037] Preferably, the programmable controller 5 in this embodiment adopts a MIZP-028A programmable controller.

[0038] like Figure 1 As shown, further, in this embodiment, the quartz glass furnace tube 2 is placed on the top of a lifting mechanism, and the lifting mechanism includes a lifting platform 6 and a worm gear lift 7 fixedly connected to the bottom end of the lifting platform 6.

[0039] In actual use, in this embodiment, by placing the quartz glass furnace tube 2 on the top of the lifting mechanism, the height of the lifting mechanism can be controlled, and then the height of the assembly to be welded in the quartz glass furnace tube 2 can be controlled, so that the part to be welded is placed in the tubular resistance furnace 1 for centralized heating; by providing a lifting platform 6 and adopting a worm gear lift 7, the stability of the quartz glass furnace tube 2 can be improved to avoid the position deviation of the assembly to be welded.

[0040] like Figure 2 and Figure 4 As shown, further, in this embodiment, the observation system includes a camera 8 and a display screen 11 electrically connected to the camera 8, a bracket 9 is fixedly connected to the camera 8, a ring bracket guide rail 10 is matched and connected to the bottom end of the bracket 9, and the ring bracket guide rail 10 is fixedly connected to the top of the tubular resistance furnace 1.

[0041] In actual use, in this embodiment, a camera 8 is provided to photograph the melting of the solder of the assembly to be welded, and the camera 8 is electrically connected to the display screen 11, so that the picture taken by the camera 8 can be played in real time; by fixedly connecting the camera 8 to the bracket 9 and matching the bracket 9 to the annular bracket guide rail 10 at the top of the tubular resistance furnace 1, the camera 8 can be manually moved to perform 360° surround photography of the internal situation of the quartz glass furnace tube 2.

[0042] It should be noted that, in this embodiment, the camera 8 is manually moved on the annular support guide rail 10 to photograph the complete welding situation in the quartz glass furnace tube 2. In this embodiment, the display screen 11 has a USB interface, and the display screen 11 is connected to the camera 8 via a USB cable.

[0043] like Figure 1 As shown, further, in this embodiment, the vacuum system includes a molecular pump 12 and a mechanical pump 13, one end of the molecular pump 12 is connected to the mechanical pump 13 through a pipe 14, and the other end is connected to the stainless steel flange 2-1 at the top of the quartz glass furnace tube 2 through a vacuum conduit 15.

[0044] In actual use, in this embodiment, by connecting the molecular pump 12 and the mechanical pump 13 through the pipeline 14, and connecting the molecular pump 12 with the stainless steel flange 2-1 at the top of the quartz glass furnace tube 2 through the vacuum conduit 15, the interior of the quartz glass furnace tube 2 can be evacuated, so that the solder is melted in a vacuum environment to avoid oxidation of the solder.

[0045] Preferably, the molecular pump 12 in this embodiment adopts a FF-100 / 150 molecular pump.

[0046] It should be noted that the vacuum system in this embodiment also includes a resistance vacuum gauge and an ionization vacuum gauge for monitoring the vacuum degree.

[0047] like Figure 1 As shown, further, in this embodiment, a support frame 16 is provided at the bottom end of the tubular resistance furnace 1, and a through hole for passing the quartz glass furnace tube 2 is opened on the support frame 16.

[0048] In actual use, in this embodiment, a support frame 16 is provided at the bottom end of the tubular resistance furnace 1 to allow the tubular resistance furnace 1 to have a fixed height, leaving space for adjusting the height of the quartz glass furnace tube 2; a through hole is provided on the support frame 16 to allow the quartz glass furnace tube 2 to pass through, and the height can be adjusted along with the lifting mechanism.

[0049] The method for using the brazing device of the present invention comprises the following steps:

[0050] Step 1: Place the assembled components to be welded into the quartz glass furnace tube 2, and seal the first stainless steel flange 2-1 and the second stainless steel flange 2-2 at both ends of the quartz glass furnace tube 2, connect the first stainless steel flange 2-1 at the top to the vacuum conduit 15, and then pass the quartz glass furnace tube 2 through the tubular resistance furnace 1 and place it on the top of the lifting platform 6;

[0051] Step 2: The operator controls the start and stop of the worm gear elevator 7 and adjusts the height of the quartz glass furnace tube 2 so that the welding part of the assembly to be welded enters the heating zone of the tubular resistance furnace 1;

[0052] Step 3: Setting the heating rate and heating temperature of the tubular resistance furnace 1 through the programmable controller 5;

[0053] Step 4: start the vacuum system to evacuate the inside of the quartz glass furnace tube 2;

[0054] Step 5: Turn on the tubular resistance furnace 1 to heat the solder at the part to be welded. When the set heating temperature is reached, observe the melting of the solder through the observation system. When the solder is spread, immediately control the worm gear elevator 7 to move the part to be welded away from the tubular resistance furnace 1.

[0055] Step 6: After the solder spread in step 5 solidifies, control the worm gear elevator 7 to make another part of the assembly to be welded reach the heating zone of the tubular resistance furnace 1, and repeat step 5 until all parts of the assembly to be welded are welded.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A vacuum tube bundle brazing device, characterized in that: It comprises a heating temperature control system and a vacuum system connected to the heating temperature control system. The components to be welded are placed in the heating temperature control system. The heating temperature control system comprises a lifting mechanism for controlling the height of the components to be welded.

2. A vacuum tube bundle brazing device according to claim 1, characterized in that: The heating temperature control system comprises a tubular resistance furnace (1), a quartz glass furnace tube (2) running through the center of the tubular resistance furnace (1), and a temperature control system connected to the tubular resistance furnace (1); the top of the quartz glass furnace tube (2) is vacuum-sealed with a first stainless steel flange (2-1), and the bottom of the quartz glass furnace tube (2) is vacuum-sealed with a second stainless steel flange (2-2); an interface for connecting to a vacuum system is provided on the first stainless steel flange (2-1); the quartz glass furnace tube (2) is used to place components to be welded; and a thermocouple (3) is provided in the heating zone of the tubular resistance furnace (1).

3. A vacuum tube bundle brazing device according to claim 2, characterized in that: The temperature control system comprises a temperature control meter (4), a thermocouple (3) and a programmable controller (5) electrically connected to the temperature control meter (4); the programmable controller (5) is electrically connected to the tubular resistance furnace (1) and the thermocouple (3).

4. A vacuum tube bundle brazing device according to claim 2, characterized in that: The quartz glass furnace tube (2) is placed on the top of a lifting mechanism, and the lifting mechanism comprises a lifting platform (6) and a worm gear lift (7) fixedly connected to the bottom end of the lifting platform (6).

5. A vacuum tube bundle brazing device according to claim 1, characterized in that: The heating temperature control system also includes an observation system, which includes a camera (8) and a display screen (11) electrically connected to the camera (8); a bracket (9) is fixedly connected to the camera (8); the bottom end of the bracket (9) is matched with an annular bracket guide rail (10); and the annular bracket guide rail (10) is fixedly connected to the top of the tubular resistance furnace (1).

6. A vacuum tube bundle brazing device according to claim 1, characterized in that: The vacuum system comprises a molecular pump (12) and a mechanical pump (13); one end of the molecular pump (12) is connected to the mechanical pump (13) via a pipeline (14), and the other end is connected to a stainless steel flange (2-1) at the top of the quartz glass furnace tube (2) via a vacuum conduit (15).

7. A vacuum tube bundle brazing device according to claim 2, characterized in that: A support frame (16) is provided at the bottom end of the tubular resistance furnace (1), and a through hole for passing the quartz glass furnace tube (2) is provided on the support frame (16).

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