Flue gas purification device of vacuum welding furnace

Abstract

The utility model discloses a flue gas purification device of a vacuum welding furnace and relates to the technical field of flue gas purification and separation. Comprising a shell, condensers are arranged in the shell, fins for flue gas to flow through are arranged in the condensers, a coil pipe passes through the fins in a reciprocating mode, installation openings corresponding to the condensers one to one are formed in the surface of the shell, front end openings of the condensers are fixed to the inner sides of the installation openings in the shell, and front end plates are detachably installed on the outer sides of the installation openings. An inlet and an outlet of the coil pipe extend to the inner end face of the front end plate, and circulating connectors corresponding to the inlet and the outlet of the coil pipe are further arranged on the surface of the front end plate. According to the flue gas purification device of the vacuum welding furnace, the flue gas is cooled through the condenser, the effect that welding flux in the flue gas is liquefied when encountering cold is improved, meanwhile, the connector of the coil pipe in the condenser extends to the front end plate, circulation pipeline arrangement is facilitated, and meanwhile later maintenance of the fins is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of fume purification and separation, in particular to a fume purification device for a vacuum welding furnace. Background Art

[0002] A vacuum soldering furnace is commonly used for soldering chip components (such as diodes and chip frames). Due to the special nature of the welded components, solder (such as flux or solder paste) often needs to be applied to the surface of the welded components before entering the vacuum soldering furnace. During the soldering process in the vacuum soldering furnace, the solder vaporizes due to heat. The vaporized solder mixes with the nitrogen circulating within the furnace and is discharged from the furnace as furnace fume. However, the vaporized solder is hazardous, so the fume must be purified before discharge.

[0003] However, unlike other industries, where flue gas contains high levels of dust, purifying the flue gas from vacuum welding furnaces is difficult to achieve through physical filtration (or pre-treatment). Traditional purification methods rely on high-voltage electrostatics. However, this method is not only energy-intensive, but some vacuum welding fumes contain reduced and oxidized hydrogen. When purified using electrostatics, this poses an explosion risk and presents a safety hazard. Currently, a safer method for purifying vacuum welding furnace fumes is to cool the vaporized solder to a liquid state for collection. This is exemplified by Solution 1, the technical solution described in Chinese Utility Model Patent No. 202322424209.8, filed on September 7, 2023, and entitled "A Purification Device for Vacuum Welding Furnaces." Solution 2, the technical solution described in Chinese Invention Patent No. 201710724229.3, filed on August 22, 2017, and entitled "A Purification Device for Metal Welding Fume Treatment." The defects of the above schemes are: Scheme 1 uses air cooling to cool the flue gas, and although Scheme 2 is a water cooling method, it arranges a condenser outside the smoke outlet. Therefore, Scheme 1 and Scheme 2 have limited cooling effects on the flue gas and it is difficult to achieve the expected purification effect.

[0004] The applicant of this application submitted a Chinese utility model patent (application number 201721897857.3) entitled "A Purification Device for a Vacuum Welding Furnace" on December 29, 2017, which describes a technical solution. In this technical solution, the flue gas is cooled by fins that are cooled by coils. Compared with the above-mentioned solutions 1 and 2, the cooling effect is improved. However, in actual use, this solution was found to have the following defects: (1) The coils and fins in this solution are arranged as a whole in the shell of the purification module, which increases the complexity of the internal circulation pipeline layout of the equipment. (2) After the solder in the flue gas is cooled and liquefied at the fins, it will adhere to the surface of the fins. Although the solder will continue to drip and be collected, there will always be solder attached to the surface of the fins. After long-term use, the gaps between the fins will be blocked. The arrangement of this solution makes the subsequent cleaning and maintenance more complicated. (3) This solution only has a single-stage fin structure, and its cooling effect is still difficult to achieve the expected effect. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to overcome the shortcomings of the existing technology, to provide a method for cooling the flue gas through a condenser, thereby improving the effect of liquefaction of the solder in the flue gas when it is cooled, and at the same time extending the interface of the coil in the condenser to the front end plate, which is convenient for the arrangement of the circulation pipeline and is also beneficial to the flue gas purification device of the vacuum welding furnace for the later maintenance of the fins.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the fume purification device of the vacuum welding furnace comprises a shell, a condenser is arranged in the shell, fins through which the flue gas flows are provided in the condenser, and the coil passes back and forth in the fins, and is characterized in that: mounting openings corresponding to the condensers are opened on the surface of the shell, the front end port of the condenser is docked and fixed with the corresponding mounting opening, a front end plate is detachably installed on the outer side of the mounting opening, the inlet and outlet of the coil extend to the inner end surface of the front end plate respectively, and a circulation joint corresponding to the inlet and outlet of the coil is also provided on the surface of the front end plate.

[0007] Preferably, a plurality of condensers are arranged side by side in the shell, and the plurality of condensers are connected in series via intermediate connecting pipes.

[0008] Preferably, a bracket is provided at the lower part of the condenser, a collecting pot is installed at the bottom of the bracket, a drain port is provided at the bottom of the condenser, and the drain port is connected to the collecting pot at the bottom of the corresponding bracket.

[0009] Preferably, a fan is provided in the shell, the inlet of the fan is connected to the outlet of the end condenser among the multiple condensers connected in series through a pipeline, and the outlet of the fan is connected to the exhaust port on the top of the shell through an exhaust pipe; the inlet of the first condenser among the multiple condensers connected in series is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the fume outlet of the vacuum welding furnace.

[0010] Preferably, a filter pot is connected to the pipeline between the terminal condenser and the fan in the plurality of condensers connected in series, and the filter pot is fixed on the outer wall of the shell.

[0011] Preferably, the lower portion of the condenser is a tapered opening that is wider at the top and narrower at the bottom, and the drain port is located at the bottom of the tapered opening.

[0012] Preferably, a cabinet door is provided at the lower portion of the shell, and the cabinet door faces the collection pot in the shell.

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

[0014] In the flue gas purification device of the vacuum welding furnace of the present application, the flue gas is cooled by a condenser, which improves the effect of the solder in the flue gas being liquefied when cooled. At the same time, the interface of the coil in the condenser is extended to the front end plate, which is convenient for the layout of the circulation pipeline and is also beneficial for the later maintenance of the fins.

[0015] All condensers are connected in series through pipelines in the shell to achieve multi-stage condensation of the flue gas, further improving the purification effect of the vaporized solder in the flue gas.

[0016] A filter pot is provided on the outside of the shell, which is beneficial to the removal of water-soluble impurities in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the axonometric view of the fume purification device of the vacuum welding furnace.

[0018] Figure 2 This is the front view of the fume purification device of the vacuum welding furnace.

[0019] Figure 3 for Figure 2 Left view of .

[0020] Figure 4 for Figure 3 Middle AA section view.

[0021] Figure 5 for Figure 3 Middle BB section view.

[0022] Figure 6 This is an axonometric diagram of the condensation mechanism in the fume purification device of a vacuum welding furnace.

[0023] Figure 7 This is a front view of the condensation mechanism in the fume purification device of the vacuum welding furnace.

[0024] Figure 8 for Figure 7 Partial cross-sectional view along CC direction.

[0025] Among them: 1. Exhaust port; 2. Shell; 3. Condensation assembly; 4. Filter pot; 5. Inlet pipe; 6. Condenser; 7. Intermediate connecting pipe; 8. Filter inlet pipe; 9. Exhaust pipe; 10. Filter exhaust pipe; 11. Fan; 12. Condensation exhaust pipe; 13. Front end plate; 14. Circulation joint; 15. Drain port; 16. Collection pot; 17. Bracket; 18. Condensation inlet; 19. Fins; 20. Coil. DETAILED DESCRIPTION

[0026] Figures 1 to 8 This is the best embodiment of the present invention, Figures 1 to 8 The utility model is further described.

[0027] like Figures 1 to 3 As shown, a fume purification device for a vacuum welding furnace comprises a housing 2. Multiple condensation assemblies 3 are arranged side by side at the front end of the housing 2, and a filter pot 4 is provided on the side of the housing 2. An air inlet pipe 5 is provided below the side of the housing 2. One end of the air inlet pipe 5 is connected to the fume outlet of the vacuum welding furnace, and the other end of the air inlet pipe 5 is connected to the interior of the housing 2. After entering the housing 2, the fume exhausted from the vacuum welding furnace is purified by the condensation assemblies 3 and the filter pot 4, and then discharged from the exhaust port 1 at the top of the housing 2.

[0028] Combine Figure 4~Figure 5 The condensation assembly 3 includes condensers 6. The condensers 6 in each group of condensation assemblies 3 are arranged side by side inside the shell 2. The inlet of the condenser 6 is located at its lower part, and the outlet of the condenser 6 is located at its top. After entering the shell 2, the air inlet pipe 5 is connected to the inlet of the lower part of the first end condenser 6. The two adjacent condensers 6 are connected in sequence through the intermediate connecting pipe 7. The outlet at the top of the condenser 6 at the end is connected to the filtered air inlet pipe 8. The filtered air inlet pipe 8 passes through the shell wall of the shell 2 and extends to the inlet of the filter pot 4. The outlet of the filter pot 4 is connected to the filtered exhaust pipe 10.

[0029] A fan 11 is provided at the bottom of the shell 2. The filtered exhaust pipe 10 passes through the shell wall of the shell 2 again and enters the interior of the shell 2. It is connected to the air inlet of the fan 11. The exhaust pipe 9 is connected to the air outlet of the fan 11. The exhaust pipe 9 is connected to the exhaust port 1 at the top of the shell 2.

[0030] like Figure 6-7 As shown, the condensation assembly 3 further includes a bracket 17. The condenser 6 in each group of condensation assemblies 3 is located on the upper part of the corresponding bracket 17, and a collection pot 16 is fixed to the bottom of each bracket 17. The bottom of the condenser 6 is a tapered opening, and a drain port 15 is provided at the bottom of the tapered opening. A drain pipe is provided at the drain port 15, and the drain pipe is connected to the collection pot 16 at the bottom of the bracket 17.

[0031] A condenser exhaust pipe 12 is provided at the top of the condenser 6. This pipe is used to connect to the intermediate connecting pipe 7 to connect to the next-stage condenser 6, or to connect to the filtered air inlet pipe 8. Condensation air inlets 18 are provided on both sides of the bottom sidewall of the condenser 6. These inlets 18 are used to connect to the air inlet pipe 5, or to connect to the intermediate connecting pipe 7 to connect to the previous-stage condenser 6. When in use, one of the two condensation air inlets 18 is selected as the inlet port of the condenser 6, depending on the access direction of the air inlet pipe 5, and the other condensation air inlet 18 is closed.

[0032] Combine Figure 8 Fins 19 are provided inside the condenser 6. A coil 20 is also provided inside the condenser 6. The coil 20 is reciprocatingly arranged inside the condenser 6, and the coil 20 passes through the fins 19 during the reciprocating arrangement. A coolant circulates inside the coil 20, and while circulating inside the coil 20, the coolant cools the fins 19.

[0033] An opening is provided at the front face of the housing 2, corresponding one-to-one with the condenser 6. The front end of the condenser 6 corresponds to the opening at the front face of the housing 2, and the condenser 6 is fixed to the inner wall of the front face of the housing 2. A front end plate 13 is also provided at the opening at the front face of the housing 2, and the front end plate 13 is fixed to the front end of the housing 2 from the outside of the housing 2.

[0034] After being secured, front plate 13 seals the front port of condenser 6 while also assisting in the circulation of coolant within coil 20. Specifically, after being reciprocated within condenser 6, the inlet and outlet of coil 20 extend to the upper and lower portions of the inner wall of front plate 13, respectively. Two circulation connectors 14 are provided on the outer end face of front plate 13. The inner port of one circulation connector 14 is connected to the inlet of coil 20, and the inner port of the other circulation connector 14 is connected to the outlet of coil 20.

[0035] All the coolant input and output connections 14 on the front end plate 13 are combined into a single pipe, serving as the coolant inlet pipe. Simultaneously, all the coolant output connections 14 on the front end plate 13 are combined into another pipe, serving as the coolant outlet pipe. The coolant inlet and outlet pipes are connected to an external cooling device. To ensure coolant circulation, a circulating pump is installed in either pipe to power the coolant.

[0036] The specific working process and working principle are as follows:

[0037] Fume exhausted from the vacuum welding furnace enters housing 2 through intake pipe 5. Fan 11 is activated to circulate the flue gas. Driven by fan 11, the flue gas sequentially passes through condensers 6 in each condensing assembly 3. Simultaneously, external coolant is constantly circulating. As the coolant flows through coils 20, it cools the corresponding fins 19.

[0038] As the flue gas flows through the condenser 6, the vaporized solder in the flue gas is cooled and liquefied on the surface of the fins 19, and adheres to the surface of the fins 19. When the solder accumulates to a certain level on the surface of the fins 19, it falls down and falls into the collection pot 16 through the drain port 15 for collection. A cabinet door facing the collection pot 16 is also provided at the lower part of the front end of the housing 2, so that the collection pot 16 can be handled immediately.

[0039] After passing through each stage of the condenser 6 in sequence, the flue gas finally enters the filter pot 4 through the filter inlet pipe 8 for secondary filtration to eliminate the remaining water-soluble impurities in the flue gas, and is finally discharged through the exhaust port 1.

[0040] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modification, equivalent variation, or modification of the above embodiment that does not depart from the technical content of the present invention and is based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A fume purification device for a vacuum welding furnace, comprising a housing (2), a condenser (6) arranged in the housing (2), fins (19) for the fume to flow through provided in the condenser (6), a coil (20) passing back and forth in the fins (19), and characterized in that: A mounting opening corresponding to the condenser (6) is provided on the surface of the shell (2), and the front end of the condenser (6) is fixedly docked with the corresponding mounting opening. A front end plate (13) is detachably mounted on the outer side of the mounting opening. The inlet and outlet of the coil (20) extend to the inner end surface of the front end plate (13) respectively. A circulation joint (14) corresponding to the inlet and outlet of the coil (20) is also provided on the surface of the front end plate (13).

2. The fume purification device for a vacuum welding furnace according to claim 1, characterized in that: A plurality of condensers (6) are arranged side by side in the shell (2), and the plurality of condensers (6) are connected in series via an intermediate connecting pipe (7).

3. The fume purification device for a vacuum welding furnace according to claim 1 or 2, characterized in that: A bracket (17) is provided at the lower portion of the condenser (6), a collecting pot (16) is installed at the bottom of the bracket (17), a drain port (15) is provided at the bottom of the condenser (6), and the drain port (15) is connected to the collecting pot (16) at the bottom of the corresponding bracket (17).

4. The fume purification device for a vacuum welding furnace according to claim 2, characterized in that: A fan (11) is provided in the shell (2), the inlet of the fan (11) is connected to the outlet of the terminal condenser (6) among the multiple condensers (6) connected in series through a pipeline, and the outlet of the fan (11) is connected to the exhaust port (1) at the top of the shell (2) through an exhaust pipe (9); the inlet of the first condenser (6) among the multiple condensers (6) connected in series is connected to one end of the air inlet pipe (5), and the other end of the air inlet pipe (5) is connected to the fume outlet of the vacuum welding furnace.

5. The fume purification device for a vacuum welding furnace according to claim 4, characterized in that: A filter pot (4) is further connected to the pipeline between the terminal condenser (6) and the fan (11) among the multiple condensers (6) connected in series, and the filter pot (4) is fixed on the outer wall of the shell (2).

6. The fume purification device for a vacuum welding furnace according to claim 3, characterized in that: The lower portion of the condenser (6) is a tapered opening that is wider at the top and narrower at the bottom, and the drain port (15) is located at the bottom of the tapered opening.

7. The fume purification device for a vacuum welding furnace according to claim 1, characterized in that: A cabinet door is provided at the lower portion of the housing (2), and the cabinet door faces the collection pot (16) in the housing (2).

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