Formic acid inflow control device for vacuum welding furnace

Abstract

The utility model discloses a formic acid inflow control device for a vacuum welding furnace, which relates to the field of vacuum welding furnaces and comprises a formic acid storage tank for storing formic acid liquid, a circulation pipeline for the formic acid liquid to flow out is arranged on the formic acid storage tank, and the outlet end of the circulation pipeline is connected with a gasifier. A gas supply pipeline for formic acid gas to flow is arranged at the gas outlet end of the gasifier, and a drainage structure is arranged at the outlet end of the gas supply pipeline. According to the utility model, formic acid gas generated by the operation of the gasifier can be diffused into the vacuum welding furnace after passing through the gas supply pipeline and the drainage structure, so that the consumed time is shorter. The nitrogen usage amount is reduced, and nitrogen resources are saved. The free stroke of formic acid molecules can be increased, contact with an oxidation film on the surface of a product is easier, and the reduction efficiency is improved. Meanwhile, in the process that the formic acid gas flows into the vacuum welding furnace, the formic acid gas can be quickly and comprehensively diffused to different positions in the vacuum welding furnace.

Description

Technical Field

[0001] The utility model relates to the field of vacuum welding furnaces, in particular to a formic acid inflow control device used for vacuum welding furnaces. Background Art

[0002] The operating principle of a vacuum welding furnace primarily involves welding in a vacuum environment to achieve efficient and high-quality welding results. Before welding begins, the furnace must be evacuated to create the required vacuum environment. A heating system is installed within the vacuum welding furnace to raise the temperature within the chamber to the required high temperature for welding. After the workpieces are heated to a certain temperature within the vacuum environment, a brazing filler metal is added to the joint. As the temperature rises, the brazing filler metal begins to melt and fills the gap in the joint. Under certain time and temperature conditions, the brazing filler metal reacts chemically with the workpiece surface, forming a strong bond.

[0003] Existing vacuum soldering furnaces can accommodate a variety of soldering processes by adding additional process conditions such as vacuum void removal, nitrogen atmosphere, and reducing atmosphere. Formic acid has been proven to be an effective reducing agent in reflow soldering, ensuring oxide film removal and maintaining wettability at lower temperatures than hydrogen, making it widely used in flux-free soldering processes.

[0004] The most widely used method for injecting formic acid gas into vacuum welding furnaces is the bubbling method. This method involves mixing nitrogen with liquid formic acid and injecting the nitrogen containing the formic acid into the vacuum welding furnace. This limits the upper limit of the formic acid concentration within the chamber. Consequently, the welding process often requires extended time to allow the formic acid to fully react. Furthermore, the nitrogen-carrying liquid formic acid into the vacuum welding furnace consumes a significant amount of nitrogen. This method reduces the vacuum welding furnace's welding efficiency and wastes nitrogen resources. Utility Model Content

[0005] In response to the above problems, the present application provides a formic acid inflow control device for a vacuum welding furnace.

[0006] To achieve the above-mentioned objectives, the present application provides the following technical solution: a formic acid inflow control device for a vacuum welding furnace, comprising a formic acid storage tank storing formic acid liquid, the formic acid storage tank being provided with a flow pipe for allowing the formic acid liquid to flow out, the outlet end of the flow pipe being connected to a vaporizer, the gas outlet end of the vaporizer being provided with a gas supply pipe for allowing formic acid gas to flow, the outlet end of the gas supply pipe being provided with a drainage structure, the formic acid gas generated by the operation of the vaporizer passing through the gas supply pipe and the drainage structure and then diffused into the interior of the vacuum welding furnace.

[0007] The circulation pipeline is provided with a valve, and one end of the circulation pipeline connected to the formic acid storage tank is provided with a pressure gauge for monitoring the flow of formic acid liquid.

[0008] Furthermore, the drainage structure includes a guide cover, the center position of which protrudes upward to form an inverted funnel-shaped plate, and a plurality of first diffusion channels equidistantly distributed along a circumferential trajectory are opened on the side surface of the guide cover.

[0009] Furthermore, a cover plate is provided at the lower opening position of the guide hood, the center position of the cover plate is recessed downward to form a funnel-shaped plate body, and a plurality of second diffusion channels equidistantly distributed along a circular trajectory are provided on the cover plate body, and the formic acid gas flowing into the guide hood from the air supply pipe can be discharged through the first diffusion channel and the second diffusion channel.

[0010] Furthermore, a rotating shaft is connected to the center of the cover plate through a bearing seat. The rotating shaft is opposite to the inner side of the guide cover, and a plurality of guide blades are arranged equidistantly along a circular trajectory on the rotating shaft. When the formic acid gas flows into the guide cover through the gas supply pipe, it contacts the guide blades in a rotating state until the formic acid gas is discharged into the vacuum welding furnace through the first diffusion channel and the second diffusion channel.

[0011] Furthermore, the guide cover is provided with a plurality of extension rods equidistantly distributed along a circular trajectory, the extension rods all extend to the bottom of the cover plate, and the bottom ends of the plurality of extension rods are connected by a accommodating sleeve, and the accommodating sleeve is provided with a drive motor that can control the synchronous rotation of the rotating shaft and the guide blades.

[0012] Furthermore, a docking sleeve is provided at the top end of the guide cover, and the docking sleeve is provided on the outer surface of the air supply pipe. The outlet end of the air supply pipe passes through the docking sleeve and extends to the inside of the guide cover.

[0013] In summary, the technical effects and advantages of the utility model are:

[0014] This utility model allows formic acid gas generated by the vaporizer to diffuse into the interior of the vacuum welding furnace after passing through the gas supply pipe and drainage structure, reducing the time required. This reduces nitrogen usage and conserves nitrogen resources. It also increases the free travel of formic acid molecules, making it easier for them to contact the oxide film on the product surface, thereby improving reduction efficiency. Furthermore, as the formic acid gas flows into the vacuum welding furnace, it can be rapidly and comprehensively diffused to various locations within the furnace, rapidly achieving a high concentration of formic acid within the vacuum chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0017] Figure 2 This is a schematic structural diagram of the utility model from a second viewing angle.

[0018] Figure 3 This is a front view structural diagram of the utility model.

[0019] Figure 4 This is a schematic diagram of the guide cover and cover structure of the utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the guide cover and cover plate after being cut open.

[0021] In the figure: 1. Formic acid storage tank; 2. Circulation pipeline; 21. Valve; 22. Pressure gauge; 3. Vaporizer; 4. Air supply pipeline; 5. Guide cover; 51. Docking sleeve; 52. First diffusion channel; 53. Extension rod; 54. Accommodation sleeve; 6. Cover plate; 61. Second diffusion channel; 62. Bearing seat; 7. Rotating shaft; 8. Guide vane; 9. Drive motor. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example: Reference Figure 1-3 The formic acid inflow control device shown is for a vacuum welding furnace, comprising a formic acid storage tank 1 storing formic acid liquid, a flow pipe 2 provided on the formic acid storage tank 1 for allowing the formic acid liquid to flow out, the outlet end of the flow pipe 2 being connected to a vaporizer 3, the gas outlet end of the vaporizer 3 being provided with a gas supply pipe 4 for allowing formic acid gas to flow, and a drainage structure provided at the outlet end of the gas supply pipe 4. The formic acid gas generated by the operation of the vaporizer 3 passes through the gas supply pipe 4 and the drainage structure and diffuses into the interior of the vacuum welding furnace.

[0024] Compared to the bubbling method, direct vaporization of liquid formic acid into the vacuum welding furnace reduces the time required. Furthermore, direct vaporization of formic acid eliminates the need for nitrogen carryover, reducing nitrogen usage and conserving nitrogen resources. Once the formic acid gas enters the vacuum welding furnace, only formic acid molecules remain in the vacuum chamber. This increases the free travel of the formic acid molecules, making them more likely to contact the oxide film on the product surface, thus improving reduction efficiency.

[0025] Specifically, a valve 21 is provided on the circulation pipe 2 to control the on / off state of the circulation pipe 2. To facilitate workers to monitor the amount of formic acid liquid used in real time, a pressure gauge 22 is provided at one end of the circulation pipe 2 connected to the formic acid storage tank 1 to monitor the formic acid liquid flow rate.

[0026] like Figure 4 、 Figure 5 As shown, the drainage structure includes a guide hood 5, the center of which protrudes upward to form an inverted funnel-shaped plate. The side surface of the guide hood 5 is provided with a plurality of first diffusion channels 52, spaced evenly along a circumferential path. Because the guide hood 5 is inverted funnel-shaped, the formic acid gas ejected through the gas supply pipe 4 is directed to the first diffusion channels 52 and discharged therethrough.

[0027] A cover plate 6 is provided at the lower opening of the guide hood 5. The center of the cover plate 6 is recessed downward to form a funnel-shaped plate body, and a plurality of second diffusion channels 61 are provided on the plate body of the cover plate 6 and are equidistantly distributed along a circular trajectory. The formic acid gas flowing into the guide hood 5 from the gas supply pipe 4 can be discharged through the first diffusion channel 52 and the second diffusion channel 61. Since the cover plate 6 is a funnel structure, the second diffusion channel 61 can have a certain inclination. The gas flowing out through the first diffusion channel 52 and the second diffusion channel 61 covers a wider range, so that the formic acid gas can be quickly and comprehensively diffused to different positions in the vacuum welding furnace.

[0028] like Figure 4 、 Figure 5 As shown, the center of the cover plate 6 is connected to a rotating shaft 7 via a bearing seat 62. The rotating shaft 7 is directly opposite the inner side of the guide cover 5 and is equipped with multiple guide blades 8 arranged equidistantly along a circular trajectory. When formic acid gas flows into the guide cover 5 through the gas supply pipe 4, it contacts the rotating guide blades 8 until the formic acid gas is discharged into the vacuum welding furnace through the first diffusion channel 52 and the second diffusion channel 61. During the rotation of the guide blades 8, the formic acid gas flow rate is accelerated, allowing the formic acid gas to be quickly discharged through the first diffusion channel 52 and the second diffusion channel 61 and diffused within the vacuum welding furnace. In welding processes requiring high formic acid concentration, high formic acid concentration can be quickly achieved within the vacuum chamber, further improving the processing quality within the vacuum welding furnace.

[0029] like Figure 4 As shown, the guide cover 5 is equipped with a plurality of extension rods 53 distributed equidistantly along a circular trajectory. The extension rods 53 all extend below the cover plate 6. The bottom ends of the extension rods 53 are connected by a housing 54. The housing 54 is equipped with a drive motor 9 that controls the synchronous rotation of the rotating shaft 7 and the guide blades 8. The drive motor 9 provides operating power for the rotating shaft 7 and the guide blades 8. The combination of the housing 54 and the extension rods 53 maintains the stability of the drive motor 9 during operation.

[0030] like Figure 4 As shown, to ensure a tight connection between the guide hood 5 and the air supply pipe 4, a docking sleeve 51 is provided at the top of the guide hood 5. The docking sleeve 51 is provided on the outer surface of the air supply pipe 4, and the outlet end of the air supply pipe 4 extends through the docking sleeve 51 into the interior of the guide hood 5. The connection between the docking sleeve 51 and the air supply pipe 4 maintains the stability of the connection between the air supply pipe 4 and the guide hood 5, preventing the escape of formic acid gas.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A formic acid inflow control device for a vacuum welding furnace, comprising a formic acid storage tank (1) storing formic acid liquid, characterized in that: The formic acid storage tank (1) is provided with a circulation pipe (2) for formic acid liquid to flow out, the outlet end of the circulation pipe (2) is connected to a vaporizer (3), the gas outlet end of the vaporizer (3) is provided with a gas supply pipe (4) for formic acid gas to flow, and the outlet end of the gas supply pipe (4) is provided with a drainage structure. The formic acid gas generated by the operation of the vaporizer (3) passes through the gas supply pipe (4) and the drainage structure and diffuses into the interior of the vacuum welding furnace; The circulation pipe (2) is provided with a valve (21), and one end of the circulation pipe (2) connected to the formic acid storage tank (1) is provided with a pressure gauge (22) for monitoring the flow rate of the formic acid liquid.

2. The formic acid inflow control device for a vacuum welding furnace according to claim 1, characterized in that: The drainage structure comprises a guide cover (5), the center of which protrudes upward to form an inverted funnel-shaped plate body, and a plurality of first diffusion channels (52) equidistantly distributed along a circumferential trajectory are provided on the side surface of the guide cover (5).

3. The formic acid inflow control device for a vacuum welding furnace according to claim 2, characterized in that: A cover plate (6) is provided at the lower opening of the guide cover (5). The center of the cover plate (6) is recessed downward to form a funnel-shaped plate body. A plurality of second diffusion channels (61) equidistantly distributed along a circumferential trajectory are provided on the plate body of the cover plate (6). Formic acid gas flowing into the guide cover (5) from the gas supply pipe (4) can be discharged through the first diffusion channel (52) and the second diffusion channel (61).

4. The formic acid inflow control device for a vacuum welding furnace according to claim 3, characterized in that: The center of the cover plate (6) is connected to a rotating shaft (7) via a bearing seat (62). The rotating shaft (7) is directly opposite to the inner side of the guide cover (5). The rotating shaft (7) is provided with a plurality of guide blades (8) arranged equidistantly along a circumferential track. When the formic acid gas flows into the guide cover (5) through the gas supply pipe (4), it contacts the guide blades (8) in a rotating state until the formic acid gas is discharged into the vacuum welding furnace through the first diffusion channel (52) and the second diffusion channel (61).

5. The formic acid inflow control device for a vacuum welding furnace according to claim 4, characterized in that: The guide cover (5) is provided with a plurality of extension rods (53) equidistantly distributed along a circular track, the extension rods (53) all extending to the bottom of the cover plate (6), and the bottom ends of the plurality of extension rods (53) are connected via a receiving sleeve (54), and the receiving sleeve (54) is provided with a driving motor (9) capable of controlling the synchronous rotation of the rotating shaft (7) and the guide blades (8).

6. The formic acid inflow control device for a vacuum welding furnace according to claim 2, characterized in that: A docking sleeve (51) is provided at the top end of the guide cover (5), and the docking sleeve (51) is provided on the outer surface of the air supply pipe (4). The outlet end of the air supply pipe (4) passes through the docking sleeve (51) and extends to the inside of the guide cover (5).

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