A nitrogen filling system for the entire area of ​​a reflow oven

Abstract

The present invention relates to the technical field of reflow soldering furnaces, and specifically to a nitrogen filling system for the entire area of ​​a reflow soldering furnace, including a nitrogen filling port pipe for adjusting the number of nitrogen filling ports, the nitrogen filling port pipe including a mounting pipe, each mounting pipe being connected end to end, and the head end of the mounting pipe being fixedly connected to a plug-in pipe, the tail end of the mounting pipe being fixedly connected to a sealing pipe, and a connecting pipe arranged between the plug-in pipe and the sealing pipe. The present invention facilitates the increase or decrease of the number of nitrogen filling holes by docking the nitrogen filling port pipe, and the oxygen content can be guaranteed when the entire area is filled with nitrogen, thereby ensuring the qualified rate of the product; at the same time, the number of nitrogen filling holes can be arbitrarily selected according to customer requirements. The number of nitrogen filling ports can be increased under the guarantee of product requirements to reduce the amount of nitrogen used; the nitrogen filling method is flexible and changeable. This solves the problem in the prior art that when the number of nitrogen filling holes needs to be adjusted, it is not convenient to increase or decrease to ensure the amount of nitrogen used.

Description

Technical Field

[0001] The invention relates to the technical field of reflow soldering furnaces, and in particular to a full-area nitrogen filling system for a reflow soldering furnace. Background Art

[0002] Since the maximum working temperature of the reflow oven is around 230-250℃, nitrogen is usually added to the reflow oven. Nitrogen is one of the inert gases and it is not easy to produce compounds with metals. Then it can avoid the oxidation reaction caused by the contact between oxygen in the air and metal, thereby improving welding ability, enhancing solderability and reducing porosity.

[0003] The existing reflow oven is not convenient for arbitrarily selecting the number of nitrogen filling holes according to customer requirements during operation. When the number of nitrogen filling holes needs to be adjusted, it is not convenient to increase or decrease the number to ensure the nitrogen usage.

[0004] Therefore, it is necessary to invent a nitrogen filling system for the entire reflow oven to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a nitrogen filling system for the whole area of ​​a reflow soldering furnace. By docking the nitrogen filling port pipe, it is convenient to increase or decrease the number of nitrogen filling holes. When the whole area is filled with nitrogen, the oxygen content can be guaranteed, thereby ensuring the qualified rate of the product; at the same time, the number of nitrogen filling holes can be arbitrarily selected according to customer requirements. The number of nitrogen filling ports is increased under the guarantee of product requirements to reduce the amount of nitrogen used; the nitrogen filling method is flexible and changeable. This solves the problem in the prior art that when the number of nitrogen filling holes needs to be adjusted, it is not convenient to increase or decrease to ensure the amount of nitrogen used.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a nitrogen filling system for the whole area of ​​a reflow soldering furnace, comprising:

[0007] A nitrogen filling port pipe, used to adjust the number of nitrogen filling ports, the nitrogen filling port pipe comprises a mounting pipe, each mounting pipe is connected end to end, and the head end of the mounting pipe is fixedly connected to a plug-in pipe, the tail end of the mounting pipe is fixedly connected to a sealing pipe, and a connecting pipe arranged between the plug-in pipe and the sealing pipe;

[0008] A distribution pipe, arranged at the output end of the installation pipe, is used to evenly distribute the nitrogen, and includes two delivery pipes;

[0009] The dispersion chamber is arranged at the output end of the conveying pipe, and the dispersion chamber includes two distribution cavities, and the two distribution cavities are symmetrically distributed.

[0010] As a preferred solution of the present invention, a nitrogen compression bottle is provided at the input end of the nitrogen filling port pipe, and the nitrogen compression bottle is installed on the welding furnace assembly. The welding furnace assembly includes a base, and the base is used to support the device as a whole. A bracket is installed inside the top of the base, and a lower furnace is installed inside the bracket. An upper furnace is provided on the top of the lower furnace, and a conveying assembly for conveying materials is provided between the upper and lower furnaces, and the two distribution cavities in each group of the dispersion chambers are respectively installed inside the lower furnace and the upper furnace.

[0011] As a preferred solution of the present invention, a rotating block and an internal thread groove are provided on the inner side of the connecting tube, a rotating groove matching with the rotating block is provided on the outer side of the connecting tube, an external thread groove matching with the internal thread groove is provided on the outer side of the plug-in tube, the connecting tube is rotatably connected to the rotating groove, and the connecting tube is threadedly connected to the plug-in tube.

[0012] As a preferred solution of the present invention, the inner wall of the plug-in tube is fixedly connected with a fixing frame 1, the outer end of the fixing frame 1 is fixedly connected with an insert rod, the inner side of the connecting tube is fixedly connected with a bucket-shaped groove, the bucket-shaped groove is arranged in a funnel shape, a sealing plate is arranged on the inner side of the bucket-shaped groove, the outer end of the sealing plate is fixedly connected with a docking rod, and the inner end of the sealing plate is fixedly connected with a limiting rod, the outer side of the limiting rod is sleeved with a fixing frame 2, the fixing frame 2 is fixed to the inner side of the connecting tube, and the interior of the fixing frame 2 is provided with a plug-in hole matching the limiting rod.

[0013] As a preferred solution of the present invention, a fixing ring is fixedly connected to the inner side of the bucket-shaped groove, a sealing plug is fixedly connected to the outer side of the sealing plate, and the fixing ring and the sealing plug are both inclined and cooperate with each other, a sealing gasket is arranged between the fixing ring and the sealing plug, and the fixing ring and the sealing plug are magnetically attracted to each other, an elastic part is sleeved on the outer side of the limit rod, and the two ends of the elastic part are respectively fixedly connected to the sealing plate and the second fixing frame.

[0014] As a preferred solution of the present invention, the delivery pipe is connected to the installation pipe, an automatic solenoid valve is installed inside the delivery pipe, and a spare pipe is connected to the side of the delivery pipe, a manual valve is installed inside the spare pipe.

[0015] As a preferred solution of the present invention, the output end of the automatic solenoid valve is connected to a distribution chamber, a diverter plate is provided inside the distribution chamber at the entrance and exit, the diverter plate is configured to be V-shaped, the top of the distribution chamber is connected to a first nitrogen inlet pipe, and the bottom of the distribution chamber is connected to a second nitrogen inlet pipe.

[0016] As a preferred solution of the present invention, the output ends of the first nitrogen inlet pipe and the second nitrogen inlet pipe are both connected with a distribution cavity, the ends of the distribution cavity are fixedly connected with a square plate, the ends of the square plate are fixedly connected with baffles on both sides, the output end of the square plate is equipped with a plurality of spray holes arranged in a rectangular array, and the distribution cavity is arranged in a pyramid shape.

[0017] As a preferred solution of the present invention, the inner wall of the distribution cavity is fixedly connected with a plurality of fixed rods, the ends of the fixed rods are fixedly connected with fixed plates, the top of the fixed plate is fixedly connected with a conical block, the outer side of the fixed plate is rotatably connected with a rotating disk through a bearing, and the outer side of the rotating disk is fixedly connected with a plurality of fan blades.

[0018] In the above technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows:

[0019] 1. By docking the plug-in pipe end of the next installation pipe with the sealing pipe end of the previous installation pipe, the connecting pipe is rotated to make the sealing pipe dock and fit with the plug-in pipe, so that the entrance of the sealing pipe is connected with the bucket-shaped groove. When the number of installation pipes needs to be reduced, the user rotates the connecting pipe in the opposite direction to release the docking of the sealing pipe with the plug-in pipe. Since the bucket-shaped groove is funnel-shaped, and the fixing ring and the sealing plug are inclined, the gas can be prevented from being blocked. The sealing gasket can improve the sealing performance of the device, and the elastic member can facilitate the reset of the device. The sealing plate is tightly fitted with the bucket-shaped groove under the push of the elastic member and the action of magnetic attraction, so that the port of the sealing pipe is automatically blocked, which does not affect the delivery of nitrogen. It is not necessary to repair and modify the device and stop the operation when adding or reducing nitrogen filling holes, thereby improving continuity.

[0020] 2. The nitrogen enters the distribution cavity through the delivery pipe. When the delivery pipe is accidentally blocked, the user can manually adjust the manual valve to improve the safety of the device. When the nitrogen enters the distribution cavity, the nitrogen is diverted through the diverter plate to prevent the uneven flow of nitrogen due to the different densities of nitrogen and air, so that the nitrogen can flow through the first nitrogen inlet pipe and the second nitrogen inlet pipe, which is convenient for uniform distribution of nitrogen. The nitrogen enters the distribution cavity through the second nitrogen inlet pipe or the second nitrogen inlet pipe. Since the interior of the distribution cavity has a certain space, it is convenient to evenly distribute the nitrogen and spray it out through the spray hole, so as to inertize, protect and purge the product;

[0021] 3. The side of the distribution cavity is also equipped with monitoring equipment to monitor the operating status and various parameters of the system in real time, including nitrogen pressure, flow, and temperature, and take corresponding measures to deal with it according to the internal situation to improve the intelligence of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the nitrogen filling port pipe and the dispersion chamber of the present invention;

[0025] Figure 3 It is a schematic diagram of the partial exploded structure of the nitrogen filling port pipe of the present invention;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the nitrogen filling port pipe of the present invention;

[0027] Figure 5 It is a schematic diagram of the connection structure between the bucket-shaped groove and the sealing plate of the present invention;

[0028] Figure 6 This is a schematic diagram of the distribution pipe structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the dispersion chamber structure of the present invention;

[0030] Figure 8 It is a schematic diagram of the internal structure of the dispersion chamber of the present invention;

[0031] Fig. 9 For the present invention Figure 8 Enlarged structural diagram at A in the middle.

[0032] Description of reference numerals:

[0033] 001, welding furnace assembly; 002, nitrogen filling port pipe; 003, distribution pipe; 004, dispersion chamber;

[0034] 101. base; 102. bracket; 103. lower furnace; 104. upper furnace; 105. conveying assembly; 106. nitrogen compression bottle;

[0035] 201, plug-in tube; 202, sealing tube; 203, connecting tube; 204, rotating block; 205, rotating groove; 206, internal thread groove; 207, external thread groove; 208, fixing frame 1; 209, plug-in rod; 210, bucket-shaped groove; 211, fixing ring; 212, sealing pad; 213, sealing plate; 214, sealing plug; 215, docking rod; 216, limiting rod; 217, elastic member; 218, fixing frame 2; 219, plug-in hole;

[0036] 301, delivery pipe; 302, automatic solenoid valve; 303, spare pipe; 304, manual valve; 305, distribution chamber; 306, splitter plate; 307, first nitrogen inlet pipe; 308, second nitrogen inlet pipe;

[0037] 401, distribution cavity; 402, square plate; 403, baffle; 404, spray hole; 405, fixing rod; 406, fixing plate; 407, conical block; 408, rotating disk; 409, fan blade. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] The present invention provides Figure 1-Figure 9 A nitrogen filling system for the entire area of ​​a reflow oven is shown, comprising

[0040] The nitrogen filling port pipe 002 is used to adjust the number of nitrogen filling ports. The nitrogen filling port pipe 002 includes a mounting pipe, each mounting pipe is connected end to end, and the head end of the mounting pipe is fixedly connected to the plug-in pipe 201, the tail end of the mounting pipe is fixedly connected to the sealing pipe 202, and a connecting pipe 203 is arranged between the plug-in pipe 201 and the sealing pipe 202;

[0041] The distribution pipe 003 is arranged at the output end of the installation pipe and is used to evenly distribute the nitrogen, and includes two delivery pipes 301;

[0042] The dispersion chamber 004 is disposed at the output end of the delivery pipe 301. The dispersion chamber 004 includes two distribution cavities 401, and the two distribution cavities 401 are symmetrically distributed;

[0043] When in use, the user can first install the nitrogen compression bottle 106 on the top of the base 101, and connect and fix the output end with the input end of the nitrogen filling port pipe 002, and then increase or decrease the number of installation pipes inside the nitrogen filling port pipe 002 as needed, and then install the distribution pipe 003 on the side of the nitrogen filling port pipe 002, wherein the dispersion chamber 004 is installed inside the conveying component 105 and the lower furnace 103, and is connected with the distribution pipe 003;

[0044] During actual welding, in order to avoid oxidation reaction caused by oxygen in the air contacting the metal, improve welding ability, enhance solderability and reduce porosity, the user can input nitrogen into the nitrogen filling port pipe 002 through the nitrogen compression bottle 106, and distribute the nitrogen through the distribution pipe 003. The distributed nitrogen passes through the dispersion chamber 004 and is evenly sprayed into the interior of the welding furnace. Since nitrogen is a kind of inert gas, it can reduce oxidation and improve the quality of welding.

[0045] As a further optimization of the present invention, a nitrogen compression bottle 106 is provided at the input end of the nitrogen filling port pipe 002, and the nitrogen compression bottle 106 is installed on the welding furnace assembly 001. The welding furnace assembly 001 includes a base 101, and the base 101 is used to support the entire device. A bracket 102 is installed inside the top of the base 101, and a lower furnace 103 is installed inside the bracket 102. An upper furnace 104 is provided on the top of the lower furnace 103, and a conveying assembly 105 for conveying materials is provided between the upper furnace 104 and the lower furnace 103. This is the prior art and will not be repeated here. The two distribution cavities 401 in each group of dispersion chambers 004 are respectively installed inside the lower furnace 103 and the upper furnace 104.

[0046] Furthermore, a rotating block 204 and an internal thread groove 206 are provided on the inner side of the connecting tube 203, a rotating groove 205 matching with the rotating block 204 is provided on the outer side of the connecting tube 203, an external thread groove 207 matching with the internal thread groove 206 is provided on the outer side of the plug-in tube 201, the connecting tube 203 is rotatably connected with the rotating groove 205, and the connecting tube 203 is threadedly connected with the plug-in tube 201;

[0047] When increasing the number of installation tubes, the user can dock the plug-in tube 201 end of the next installation tube with the sealing tube 202 end of the previous installation tube, and rotate the connecting tube 203 on the outside of the sealing tube 202 so that the connecting tube 203 is threadedly connected to the outside of the plug-in tube 201, and rotate the connecting tube 203 so that the sealing tube 202 and the plug-in tube 201 are docked and fit.

[0048] Among them, the inner wall of the plug-in tube 201 is fixedly connected with a fixing frame 1 208, the outer end of the fixing frame 1 208 is fixedly connected with an insertion rod 209, the inner side of the connecting tube 203 is fixedly connected with a bucket-shaped groove 210, the bucket-shaped groove 210 is arranged in a funnel shape, the inner side of the bucket-shaped groove 210 is provided with a sealing plate 213, the outer end of the sealing plate 213 is fixedly connected with a docking rod 215, and the inner end of the sealing plate 213 is fixedly connected with a limiting rod 216, the outer side of the limiting rod 216 is sleeved with a fixing frame 218, the fixing frame 218 is fixed to the inner side of the connecting tube 203, and the fixing frame 218 is provided with a plug hole 219 matching the limiting rod 216 inside;

[0049] During the docking process, the insertion rod 209 passes through the bucket-shaped groove 210 and abuts against the docking rod 215. The sealing plate 213 is pushed by the docking rod 215 to make the limit rod 216 slide inside the plug hole 219, so that the sealing plate 213 moves closer to the fixing frame 218 and away from the bucket-shaped groove 210, so that the entrance of the sealing tube 202 is connected with the bucket-shaped groove 210. When the number of installation tubes needs to be reduced, the user rotates the connecting tube 203 in the opposite direction to release the docking of the sealing tube 202 with the plug-in tube 201. The sealing plate 213 is tightly fitted with the bucket-shaped groove 210 under the push of the elastic member 217 and the action of magnetic attraction, so that the port of the sealing tube 202 is automatically blocked, which does not affect the delivery of nitrogen and does not need to stop the device, thereby improving continuity.

[0050] In the above structure, a fixing ring 211 is fixedly connected to the inner side of the bucket-shaped groove 210, a sealing plug 214 is fixedly connected to the outer side of the sealing plate 213, and the fixing ring 211 and the sealing plug 214 are both inclined and matched with each other, a sealing gasket 212 is arranged between the fixing ring 211 and the sealing plug 214, and the fixing ring 211 and the sealing plug 214 are magnetically attracted to each other, and an elastic member 217 is sleeved on the outer side of the limiting rod 216, and the two ends of the elastic member 217 are fixedly connected to the sealing plate 213 and the second fixing frame 218 respectively;

[0051] When nitrogen is being transported, the funnel-shaped groove 210 and the inclined arrangement of the fixing ring 211 and the sealing plug 214 can prevent the gas from being blocked, wherein the sealing gasket 212 can improve the sealing performance of the device, and the elastic member 217 can facilitate the resetting of the device.

[0052] Furthermore, the delivery pipe 301 is connected to the installation pipe, an automatic solenoid valve 302 is installed inside the delivery pipe 301, a spare pipe 303 is connected to the side of the delivery pipe 301, and a manual valve 304 is installed inside the spare pipe 303;

[0053] Nitrogen enters the distribution chamber 305 through the delivery pipe 301. When the delivery pipe 301 is accidentally blocked, the user can manually adjust the manual valve 304 to improve the safety of the device.

[0054] The output end of the automatic solenoid valve 302 is connected to a distribution chamber 305, a diverter plate 306 is provided at the inlet and outlet of the distribution chamber 305, and the diverter plate 306 is configured in a V-shape. The top of the distribution chamber 305 is connected to a first nitrogen inlet pipe 307, and the bottom of the distribution chamber 305 is connected to a second nitrogen inlet pipe 308.

[0055] When the nitrogen enters the distribution chamber 305 , the nitrogen is diverted by the diverter plate 306 to prevent the nitrogen from flowing unevenly due to the different densities between nitrogen and air, so that the nitrogen flows through the first nitrogen inlet pipe 307 and the second nitrogen inlet pipe 308 .

[0056] In the above structure, the output ends of the first nitrogen inlet pipe 307 and the second nitrogen inlet pipe 308 are both connected to the distribution cavity 401, the end of the distribution cavity 401 is fixedly connected to the square plate 402, the ends of the square plate 402 are fixedly connected to the baffles 403, the output end of the square plate 402 is installed with a plurality of spray holes 404 arranged in a rectangular array, and the distribution cavity 401 is arranged in a pyramid shape;

[0057] The side of the distribution cavity 401 is also equipped with monitoring equipment for real-time monitoring of the system's operating status and various parameters, including nitrogen pressure, flow, and temperature. Once an abnormal situation is found, the system will immediately issue an alarm and take appropriate measures to deal with it.

[0058] Nitrogen enters the distribution cavity 401 through the second nitrogen inlet pipe 308 or the second nitrogen inlet pipe 308. Since the distribution cavity 401 has a certain space inside, it is convenient to evenly distribute the nitrogen and spray it out through the spray hole 404, so as to inert, protect and purge the product.

[0059] The inner wall of the distribution cavity 401 is fixedly connected with a plurality of fixing rods 405, the ends of the fixing rods 405 are fixedly connected with fixing plates 406, the tops of the fixing plates 406 are fixedly connected with conical blocks 407, the outer sides of the fixing plates 406 are rotatably connected with a rotating disk 408 through bearings, and the outer sides of the rotating disk 408 are fixedly connected with a plurality of fan blades 409;

[0060] When nitrogen is blown in, the nitrogen blows toward the conical block 407, and is blown onto the fan blades 409 through the conical block 407, driving the fan blades 409 and the rotating disk 408 to rotate, wherein the fixed plate 406 is fixed inside the distribution cavity 401 through the fixed rod 405, and the fan blades 409 facilitate further uniform distribution of the nitrogen.

[0061] A heating wire may be disposed inside the distribution cavity 401 to heat the nitrogen.

[0062] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A nitrogen filling system for the entire area of ​​a reflow oven, characterized in that: include: A nitrogen filling port pipe (002) is used to adjust the number of nitrogen filling ports, the nitrogen filling port pipe (002) comprising a mounting pipe, each mounting pipe being connected end to end, and the head end of the mounting pipe being fixedly connected to a plug-in pipe (201), the tail end of the mounting pipe being fixedly connected to a sealing pipe (202), and a connecting pipe (203) arranged between the plug-in pipe (201) and the sealing pipe (202); A distribution pipe (003), arranged at the output end of the installation pipe, is used to evenly distribute the nitrogen, and includes two delivery pipes (301); A dispersion chamber (004) is arranged at the output end of the delivery pipe (301), wherein the dispersion chamber (004) includes two distribution cavities (401), and the two distribution cavities (401) are symmetrically distributed; The inner wall of the plug-in tube (201) is fixedly connected with a fixing frame 1 (208), the outer end of the fixing frame 1 (208) is fixedly connected with an insert rod (209), the inner side of the connecting tube (203) is fixedly connected with a bucket-shaped groove (210), the bucket-shaped groove (210) is arranged in a funnel shape, a sealing plate (213) is arranged on the inner side of the bucket-shaped groove (210), the outer end of the sealing plate (213) is fixedly connected with a docking rod (215), and the inner end of the sealing plate (213) is fixedly connected with a limiting rod (216), the outer side of the limiting rod (216) is sleeved with a fixing frame 2 (218), the fixing frame 2 (218) is fixed on the inner side of the connecting tube (203), and a plug-in hole (219) matching with the limiting rod (216) is provided inside the fixing frame 2 (218); A fixing ring (211) is fixedly connected to the inner side of the bucket-shaped groove (210), a sealing plug (214) is fixedly connected to the outer side of the sealing plate (213), and the fixing ring (211) and the sealing plug (214) are both arranged obliquely and cooperate with each other, a sealing gasket (212) is arranged between the fixing ring (211) and the sealing plug (214), and the fixing ring (211) and the sealing plug (214) are magnetically attracted to each other, an elastic member (217) is sleeved on the outer side of the limiting rod (216), and two ends of the elastic member (217) are fixedly connected to the sealing plate (213) and the second fixing frame (218) respectively; The delivery pipe (301) is connected to the installation pipe, an automatic solenoid valve (302) is installed inside the delivery pipe (301), a side of the delivery pipe (301) is connected to a spare pipe (303), and a manual valve (304) is installed inside the spare pipe (303); The output end of the automatic solenoid valve (302) is connected to a distribution chamber (305), a diverter plate (306) is arranged at the inlet and outlet of the distribution chamber (305), and the diverter plate (306) is arranged in a V-shape. The top of the distribution chamber (305) is connected to a first nitrogen inlet pipe (307), and the bottom of the distribution chamber (305) is connected to a second nitrogen inlet pipe (308); The output ends of the first nitrogen inlet pipe (307) and the second nitrogen inlet pipe (308) are both connected to a distribution cavity (401); a square plate (402) is fixedly connected to the end of the distribution cavity (401); baffles (403) are fixedly connected to both sides of the end of the square plate (402); a plurality of spray holes (404) arranged in a rectangular array are installed at the output end of the square plate (402); and the distribution cavity (401) is arranged in a pyramid shape; The inner wall of the distribution cavity (401) is fixedly connected to a plurality of fixed rods (405), the ends of the fixed rods (405) are fixedly connected to a fixed plate (406), the top of the fixed plate (406) is fixedly connected to a conical block (407), the outer side of the fixed plate (406) is rotatably connected to a rotating disk (408) via a bearing, and the outer side of the rotating disk (408) is fixedly connected to a plurality of fan blades (409).

2. A nitrogen filling system for the entire reflow oven according to claim 1, characterized in that: A nitrogen compression bottle (106) is provided at the input end of the nitrogen filling port pipe (002), and the nitrogen compression bottle (106) is installed on the welding furnace assembly (001). The welding furnace assembly (001) includes a base (101), and the base (101) is used to support the device as a whole. A bracket (102) is installed inside the top of the base (101), and a lower furnace (103) is installed inside the bracket (102). An upper furnace (104) is provided on the top of the lower furnace (103). A conveying assembly (105) for conveying materials is provided between the upper furnace (104) and the lower furnace (103). The two distribution cavities (401) in each group of the dispersion chambers (004) are respectively installed inside the lower furnace (103) and the upper furnace (104).

3. A nitrogen filling system for the entire reflow oven according to claim 1, characterized in that: The inner side of the connecting tube (203) is provided with a rotating block (204) and an internal thread groove (206); the outer side of the connecting tube (203) is provided with a rotating groove (205) matched with the rotating block (204); the outer side of the plug-in tube (201) is provided with an external thread groove (207) matched with the internal thread groove (206); the connecting tube (203) is rotatably connected to the rotating groove (205); and the connecting tube (203) is threadably connected to the plug-in tube (201).

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