Uniform flow and temperature module, uniform flow and temperature heating module and furnace equipment

Abstract

The application relates to the technical field of reflow soldering furnaces, in particular to a uniform-flow and uniform-temperature module, a uniform-flow and uniform-temperature heating module and a furnace device. The uniform-flow and uniform-temperature module is characterized in that the air suction pipe is vertically fixed in the inner cavity; the uniform-flow plate is fixed in the shell assembly, and the uniform-flow plate is uniformly provided with through holes; the upper part of the uniform-flow plate forms a high-pressure area, and the high-pressure area is used for pressurizing the air flow to form a high-pressure air flow; the air blowing plate is fixed in the shell assembly, and the air blowing plate is uniformly provided with air flow outlets. The uniform-flow and uniform-temperature heating module is characterized in that the heating assembly for heating the air flow is arranged on the uniform-flow and uniform-temperature module. The furnace device comprises the above-mentioned uniform-flow and uniform-temperature module or the above-mentioned uniform-flow and uniform-temperature heating module. The air flow is sucked into the inner cavity by the air suction pipe and is pressurized in the high-pressure area to form a high-pressure air flow; the high-pressure air flow is uniformly dispersed through the through holes on the uniform-flow plate and is sprayed out from the air flow outlets of the air blowing plate. Since the air flow outlets are uniformly arranged, the high-pressure air flow can be uniformly sprayed out at both ends and the middle part of the air blowing plate, thereby achieving the effects of uniform heat flow and uniform temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reflow soldering furnace, in particular to a uniform flow and temperature uniformity module, a uniform flow and temperature uniformity heating module and a furnace equipment. BACKGROUND

[0002] The reflow soldering furnace is a device that provides a heating environment to make the solder paste melt, so that the surface-mounted components and circuit boards are reliably combined together through the solder paste alloy. The nitrogen protection in the reflow soldering furnace can prevent the soldering tin and silver materials prone to oxidation from being oxidized in the high-temperature state, and avoid producing welding defects.

[0003] It is well known that in the SMT (Surface Mounting Technology) production, various different electrical components are combined with the PCB board through the melting and solidification of the solder paste; the control of the welding process is very important during the whole heating and cooling stage of welding, especially the heating stage. With the development of surface mounting technology and process becoming more and more mature, new requirements are constantly put forward for the reflow soldering furnace, and with the development of 5G technology, the customer's product is also getting bigger and bigger, and the requirement for the reflow soldering furnace to complete the welding of components with high quality is more demanding, and new requirements are put forward for the equipment capacity, energy saving and consumption reduction and equipment maintenance, etc., and the maximization of economic benefits needs to be pursued.

[0004] Among them, the temperature non-uniformity, also known as the cross-direction temperature difference of the conveying belt ΔT, is an important indicator to characterize the performance of the reflow soldering equipment, which refers to the temperature difference at the working position of any cross section perpendicular to the PCB conveying direction in the furnace. Generally, the maximum width of the bare PCB that can be welded by the reflow soldering furnace is tested, and the maximum difference of the welding peak temperature of 3 test points is used to represent it. This indicator reflects the real temperature on the printed board, directly affects the welding quality of the product, and the current advanced indicator is less than ±2℃.

[0005] At present, in order to ensure the welding temperature uniformity and hot air convection stability of large product size, the arrangement mode of blowing and suction of the heating module is unreasonable, and the heating module is relatively long. Due to the problem of wind concentration, the heating of the area close to the suction is greatly affected, while the blowing area is weakly affected, which directly affects the heat balance in the whole heating area and the stability of the hot air circulation airflow, and easily causes high temperature far from the suction port and low temperature close to the suction port. Moreover, due to the weak control of the air volume in the middle area of the heating module, the stability of the airflow of the single heating module itself is directly affected, causing airflow drift, resulting in temperature difference and nitrogen consumption, especially causing performance problems such as cross-direction temperature difference exceeding the standard. SUMMARY

[0006] The present application aims to provide a uniform flow and temperature uniformity module, a uniform flow and temperature uniformity heating module and a furnace device to solve the above technical problems of poor soldering temperature uniformity and hot air convection stability in the reflow soldering furnace in the prior art.

[0007] To achieve the above-mentioned purposes, on the one hand, the technical scheme adopted by the present application is:

[0008] The uniform flow and temperature uniformity module comprises:

[0009] A housing assembly; the housing assembly has an inner cavity, the inner cavity penetrates the bottom of the housing assembly and forms an opening;

[0010] An air suction pipe; the air suction pipe is provided with a plurality of air suction pipes and is vertically fixed in the inner cavity; the air suction pipe is used for attracting air;

[0011] A uniform flow plate; the uniform flow plate is fixed in the housing assembly, the uniform flow plate is uniformly provided with through holes for uniformly dispersing the air; the upper part of the uniform flow plate forms a high pressure area, the high pressure area is used for pressurizing the air to form a high pressure air flow;

[0012] A blowing plate; the blowing plate is fixed in the housing assembly, and the blowing plate is uniformly provided with air outlets, the air outlets are used for the ejection of the high pressure air flow;

[0013] Further comprising a fan assembly fixed on the housing assembly for generating the air.

[0014] On the other hand, the technical scheme adopted by the present application is:

[0015] The uniform flow and temperature uniformity heating module comprises:

[0016] A housing assembly; the housing assembly has an inner cavity, the inner cavity penetrates the bottom of the housing assembly and forms an opening;

[0017] An air suction pipe; the air suction pipe is provided with a plurality of air suction pipes and is vertically fixed in the inner cavity; the air suction pipe is used for attracting air;

[0018] A uniform flow plate; the uniform flow plate is fixed in the housing assembly, the uniform flow plate is uniformly provided with through holes for uniformly dispersing the air; the upper part of the uniform flow plate forms a high pressure area, the high pressure area is used for pressurizing the air to form a high pressure air flow;

[0019] A blowing plate; the blowing plate is fixed in the housing assembly, and the blowing plate is uniformly provided with air outlets, the air outlets are used for the ejection of the high pressure air flow;

[0020] Further comprising a fan assembly fixed on the housing assembly for generating the air and a heating assembly fixed in the inner cavity; the heating assembly is used for heating the air.

[0021] Preferably, the uniform flow plate is provided with two layers, and the high pressure area is provided with two.

[0022] Preferably, the air flow outlet covers the whole blowing plane of the blowing plate; the air flow outlet comprises:

[0023] a blowing pipe; the blowing pipe is arranged at two ends of the blowing plate;

[0024] a blowing nozzle; the blowing nozzle is arranged at the middle part of the blowing plate.

[0025] Preferably, the air flow outflow speed of the blowing pipe is equal to the air flow outflow speed of the blowing nozzle.

[0026] Preferably, the air suction pipe at two ends of the inner cavity is coaxially arranged with the blowing pipe, and the air suction end of the air suction pipe is inserted into the blowing pipe; an annular gap is formed between the air suction end and the blowing pipe, and the annular gap is used for the high pressure air flow to be sprayed outwards.

[0027] Preferably, the air suction pipe at two ends of the inner cavity is arranged in a staggered manner with the blowing pipe.

[0028] In another aspect, another technical scheme adopted by the present application is:

[0029] a furnace device comprising the uniform flow and temperature uniformization module as described above or the uniform flow and temperature uniformization heating module as described in any one of the above.

[0030] Preferably, the furnace device is an air furnace or a vacuum reflow soldering furnace.

[0031] Preferably, the heating area of the vacuum reflow soldering furnace is fixed with the uniform flow and temperature uniformization heating module, and / or the cooling area of the vacuum reflow soldering furnace is fixed with the uniform flow and temperature uniformization module.

[0032] Advantages of the present application:

[0033] Regarding the uniform flow and temperature uniformization module, when the fan assembly works, the wind force outside the uniform flow and temperature uniformization module is sucked into the inner cavity of the shell assembly by the air suction pipe. The wind force is continuously sucked and pressurized in the high pressure area to form a high pressure air flow; the high pressure air flow is uniformly dispersed through the through holes on the uniform flow plate and sprayed from the air flow outlet of the blowing plate. Due to the uniform arrangement of the air flow outlet, the high pressure air flow can be uniformly sprayed at two ends and the middle part of the blowing plate, thereby achieving the effect of uniform heat flow and uniform temperature.

[0034] On the basis of the above-mentioned uniform flow temperature uniformity module, a heating assembly for heating the air flow is added. The heat absorption area (the area where the heating assembly is located) and the air blowing area (the area where the uniform flow plate and the air blowing plate are located) are effectively mixed to form a uniform flow temperature uniformity heating module. The air flow speed of the entire air blowing surface is consistent, so the air flow temperature is also consistent, effectively improving the temperature difference. When the uniform flow temperature uniformity heating module is installed in a vacuum reflow soldering furnace, the transverse temperature difference ΔT of the vacuum reflow soldering furnace is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The illustrations are given for the purpose of explaining the application and are not intended to limit the application in any manner. In the drawings:

[0036] Figure 1 is a schematic diagram of the perspective structure of the uniform flow temperature uniformity heating module in an embodiment;

[0037] Figure 2 is a schematic diagram of the bottom view of the uniform flow temperature uniformity heating module; Figure 1

[0038] Figure 3 is a schematic diagram of the A-A section of the uniform flow temperature uniformity heating module; Figure 2

[0039] Figure 4 is a schematic diagram of the cooperation of the air suction pipe and the air blowing pipe and the air blowing nozzle;

[0040] Figure 5 is a schematic diagram of the perspective structure of the shell assembly in an embodiment;

[0041] Figure 6 is a schematic diagram of the bottom view of the shell assembly; Figure 5

[0042] Figure 7 is a schematic diagram of the A-A section of the shell assembly; Figure 6

[0043] is a schematic diagram of the perspective structure of the air blowing plate in an embodiment; Figure 8

[0044] is a schematic diagram of the bottom view of the air blowing plate; Figure 9 Figure 8

[0045] is a schematic diagram of the A-A section of the air blowing plate; Figure 10 Figure 9 is a schematic diagram of the working principle of the uniform flow temperature uniformity heating module in an embodiment.

[0046] Figure 11

[0047] ​​​​​​Reference numerals: 1 - housing assembly; 2 - flow uniformizing plate; 3 - blowing plate; 4 - fan assembly; 5 - gypsum board; 6 - thermocouple interface; 7 - heating wire; 8 - power supply interface; 21 - housing; 22 - suction housing; 23 - suction pipe; 24 - thermocouple mounting pipe; 25 - motor mounting column; 26 - flow uniformizing plate mounting angle iron; 27 - outer mounting bracket; 28 - blowing plate mounting bracket; 29 - blowing plate sealing strip; 31 - blowing plate body; 32 - blowing pipe; 33 - blowing nozzle. DETAILED DESCRIPTION

[0048] The present application will be described by way of specific embodiments, and those skilled in the art will readily understand other advantages and purposes of the present application from the disclosure of the present application.

[0049] Reference should be made to the drawings attached hereto. It should be noted that the structures, proportions, sizes, etc. shown in the drawings for the purpose of illustrating the disclosed content of the present application are merely intended to facilitate the understanding and reading of the present application by those skilled in the art, and are not intended to limit the defined conditions under which the present application can be implemented, and therefore do not have technical significance. Any modification of the structures, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the disclosed technical content of the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and "one" used in the present specification are merely intended to facilitate the understanding of the description, and are not intended to limit the scope of the present application, and the change or adjustment of the relative relationship, without substantially changing the technical content, should also be considered as the scope of the present application.

[0050] Example 1

[0051] Reference should be made to Figures 1-11Wherein, ignore the heating wire 7 shown in the figure. The present application provides a uniform flow and temperature uniform heating module, comprising: a housing assembly 1, a suction pipe 23, a uniform flow plate 2, a blowing plate 3. The housing assembly 1 has a cavity, the cavity through the bottom of the housing assembly 1 and form an opening; the suction pipe 23 is provided with a plurality of and vertical fixed in the cavity; the suction pipe 23 for suction wind; the uniform flow plate 2 is fixed in the housing assembly 1, the uniform flow plate 2 is evenly provided with a through hole for uniform dispersion of the wind force; the upper of the uniform flow plate 2 forms a high pressure area, the high pressure area for pressurized wind power to form a high pressure airflow; the blowing plate 3 is fixed in the housing assembly 1, and the blowing plate 3 is uniformly arranged with an airflow outlet for the high pressure airflow to the opening. The wind power outside the uniform flow and temperature uniform heating module is sucked into the cavity of the housing assembly 1 by the suction pipe 23. The wind power is continuously sucked in, and is pressurized to form a high pressure airflow in the high pressure area; the high pressure airflow is uniformly dispersed through the through hole on the uniform flow plate 2 and then sprayed from the airflow outlet of the blowing plate 3. Because the airflow outlet is uniformly arranged, the high pressure airflow can be uniformly sprayed at both ends and the middle of the blowing plate 3, thereby achieving the effect of uniform heat flow and uniform temperature.

[0052] In addition, the uniform flow and temperature uniform heating module further comprises a fan assembly 4 fixed on the housing assembly 1 for generating the wind power.

[0053] Example two

[0054] Please refer to Figures 1-11 The present application provides a uniform flow and temperature uniform heating module, comprising: a housing assembly 1, a suction pipe 23, a uniform flow plate 2, a blowing plate 3. The housing assembly 1 has a cavity, the cavity through the bottom of the housing assembly 1 and form an opening; the suction pipe 23 is provided with a plurality of and vertical fixed in the cavity; the suction pipe 23 for suction wind; the uniform flow plate 2 is fixed in the housing assembly 1, the uniform flow plate 2 is evenly provided with a through hole for uniform dispersion of the wind force; the upper of the uniform flow plate 2 forms a high pressure area, the high pressure area for pressurized wind power to form a high pressure airflow; the blowing plate 3 is fixed in the housing assembly 1, and the blowing plate 3 is uniformly arranged with an airflow outlet for the high pressure airflow to the opening. The uniform flow and temperature uniform heating module further comprises a fan assembly 4 fixed on the housing assembly 1 for generating the wind power and a heating assembly fixed in the cavity; the heating assembly is used for heating the wind power entering the cavity.

[0055] Wherein, the fan assembly 4 forms the airflow movement. In this example, the rear inclined impeller, the motor shaft with nitrogen blowing interface, prevent the motor shaft at the leakage of nitrogen.

[0056] The uniform flow and temperature uniform heating module is further improved as follows:

[0057] The uniform flow plate 2 is provided with two layers, and the high pressure area is provided with two. It is convenient to pressurize the airflow to uniformly disperse and eliminate the wind speed dead zone. Moreover, the airflow outlet covers the entire blowing plane of the blowing plate 3; the airflow outlet includes: blowing pipe 32 and blowing nozzle. Among them, the blowing pipe 32 is arranged at both ends of the blowing plate 3; the blowing nozzle 33 is arranged in the middle of the blowing plate 3. After the airflow is sucked into the inner cavity from the suction pipe 23, it can be heated by the heating assembly. Then the heated high pressure airflow can be uniformly sprayed out from the blowing pipe 32 and the blowing nozzle 33, which has the effect of uniform flow and uniform temperature.

[0058] Specifically, the heating assembly includes heating wire 7 and is provided with thermocouple interface 6. The thermocouple interface 6 is used for air-tight sealing when the K-type thermocouple passes through the sealing plate (not shown in the figure). At the same time, the heating wire 7 is arranged in two groups in parallel, and the heating effect of the heating wire 7 is better.

[0059] Further, as Figure 4 , Figures 8-10 , the airflow outflow speed of the blowing pipe 32 is equal to the airflow outflow speed of the blowing nozzle 33. The effective cross-sectional area of the blowing nozzle 33 is smaller than that of the blowing pipe 32. The cross-sectional area of the middle blowing nozzle 33 can be optimized by computer simulation to keep the airflow speed of each blowing nozzle 33 in the middle and the blowing pipe 32 at the suction pipe 23 consistent, so that uniform airflow, consistent wind speed and consistent temperature are obtained on the entire blowing plate 3. Specifically, the suction pipe 23 at both ends of the inner cavity can be coaxially arranged with the blowing pipe 32, and the suction end of the suction pipe 23 is inserted into the blowing pipe 32, and an annular gap is formed between the suction end and the blowing pipe 32, which is used for the high pressure airflow to spray out, as Figure 4 . The suction pipe 23 at both ends of the inner cavity can also be arranged in a staggered manner with the blowing pipe 32.

[0060] In this example, the airflow is sucked from multiple suction pipes 23, accelerated by the impeller of the fan assembly 4, and forms a high pressure airflow in the first and second pressure areas. Due to the resistance of the uniform flow plate 2, the airflow is pressurized after heat exchange of the heating assembly, and the left and right parts of the airflow are blown out through the blowing pipe 32 on the blowing plate 3, and the middle part is directly blown out from the middle blowing nozzle 33.

[0061] Embodiment three

[0062] Please refer to Figures 1-11 , the uniform flow and temperature heating module in embodiment two can be described from another aspect to clearly and comprehensively set forth its technical solutions.

[0063] As Figures 1-3 , the uniform flow and temperature heating module comprises:

[0064] The shell assembly 1 has an air duct suction port on the shell assembly 1.

[0065] The uniform flow plate 2 has two layers, and small holes (i.e. through holes, with an opening rate of 33%) are uniformly distributed on the upper layer, so that two high-pressure areas are formed to facilitate pressurization and uniform dispersion of the airflow and eliminate dead zones of wind speed.

[0066] The air blowing plate 3 has an airflow outlet covering the entire air blowing plane.

[0067] The fan assembly 4 is used to form airflow movement, and in this case, it is a backward-inclined impeller, and the motor shaft is provided with a nitrogen blowing interface to prevent nitrogen leakage at the motor shaft.

[0068] The gypsum board 5 is heat-insulating and can prevent the fan assembly 4 from being damaged by heat.

[0069] The thermocouple interface 6 is used for air-tight sealing when the K-type thermocouple passes through the sealing plate (not shown in the figure).

[0070] The heating wire 7 is in parallel connection in two groups, and in this case, it is used for air blowing and heating, which can heat the air in the inner cavity.

[0071] The power supply interface 8 is used for air-tight sealing when the power supply line passes through the sealing plate (not shown in the figure), and at the same time, it has a nitrogen charging interface, which can charge nitrogen into the furnace.

[0072] Among them, regarding the shell assembly 1, as Figures 5-7 The shell assembly 1 includes:

[0073] The shell 21.

[0074] The air suction shell 22 is riveted to the shell body 21.

[0075] The air suction pipe 23 is welded to the air suction shell 22 to form an air suction channel.

[0076] The thermocouple mounting pipe 24 is used to mount the thermocouple support.

[0077] The motor mounting column 25 is used to mount the motor impeller assembly.

[0078] The uniform flow plate mounting angle iron 26 is used to mount the first uniform flow plate 2; the second uniform flow plate 2 is directly mounted on the shell 21.

[0079] The external mounting bracket 27 is used to mount the uniform flow and temperature heating module on the vacuum reflow soldering furnace.

[0080] The air blowing plate mounting bracket 28 is used to mount the air blowing plate 3.

[0081] Blow plate sealing strip 29 is used for sealing of blow plate 3, preventing blow nozzle wind speed loss.

[0082] Regarding the blow plate 3, as Figures 8-10 , the blow plate 3 comprises a blow plate body 31. The blow pipe 32 at both ends and the blow nozzle 33 in the middle are welded on the blow plate body 31. The effective cross-sectional area of the blow nozzle 33 is smaller than that of the blow pipe 32.

[0083] The working principle of the uniform flow and temperature heating module is that Figure 11 , the airflow is sucked from multiple suction pipes 23, accelerated by the impeller, and forms a high-pressure airflow in the first and second pressure zones. Due to the resistance of the uniform flow plate 2, the airflow is heated and pressurized. The left and right parts of the airflow are blown out through the blow pipe 32 on the blow plate 3, and the middle part is blown out directly from the middle blow nozzle 33, as Figure 4 .

[0084] The cross-sectional area of the middle blow nozzle 33 can be optimized by computer simulation to keep the airflow velocity of each hole in the middle and the blow pipe 32 at the suction pipe 23 consistent, so that uniform airflow, consistent wind speed and temperature are obtained on the entire blow plate 3, achieving the effect of uniform flow and temperature heating and small transverse temperature difference ΔT of the conveying belt.

[0085] The characteristics of the present application are:

[0086] 1. Two layers of pressure zones are set, and there is no blow-off dead angle.

[0087] 2. The airflow velocity of the entire blow plate 3 is uniform.

[0088] 3. The suction pipe 23 and the blow pipe 32 are coaxial and located higher than the outlet of the blow pipe 32, and the outlet airflow velocity is uniform; the cross section of the blow pipe 32 is optimized in size.

[0089] 4. The cross-sectional area of the middle blow nozzle 33 is smaller than that of the blow pipe 32, so that the wind speed of each blow port on the entire blow plate 3 is consistent.

[0090] 5. The suction pipe 23 is a multi-pipe hidden structure.

[0091] The above technical solutions can be further improved as follows:

[0092] 1. The blow plate 3 adopts other shapes;

[0093] 2. The suction pipe 23 adopts other styles or arrangement methods;

[0094] 3. The suction pipe 23 and the blow pipe 32 are not coaxial and are staggered;

[0095] 4. Instead of blow heating, suction heating is used;

[0096] 5. The heating wire 7 can adopt other shapes, such as semicircular, rectangular, circular, etc.

[0097] 6. The heating wire 7 can adopt other patterns, such as armoring.

[0098] Finally, it should be noted that the uniform flow and temperature heating module can be used in other reflow ovens, such as air ovens, vacuum reflow soldering ovens. Specifically, the uniform flow and temperature heating module is used in the heating area or cooling area of the vacuum reflow soldering oven (when used in the cooling area, generally no heating wire 7).

[0099] The above embodiments only illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present application should be covered by the protection scope of the present application.

Claims

1. A uniform flow and temperature heating module, characterized in that, include: Housing components; The housing assembly has an inner cavity that extends through the bottom of the housing assembly and forms an opening; The suction pipes are provided in multiple sections and are vertically fixed in the inner cavity; the suction pipes are used to draw in air. A flow equalizer; the flow equalizer is fixed in the outer shell assembly, and the flow equalizer is evenly provided with through holes for evenly dispersing the wind force; a high-pressure zone is formed above the flow equalizer, and the high-pressure zone is used to pressurize the wind force to form a high-pressure airflow; A blower plate; the blower plate is fixed in the housing assembly, and the blower plate has evenly arranged airflow outlets, the airflow outlets being used for the ejection of high-pressure airflow; the airflow outlets cover the entire blowing plane of the blower plate; the airflow outlets include: Air blowing pipe; the air blowing pipe is arranged at both ends of the air blowing plate; A blower nozzle; the blower nozzle is located in the middle of the blower plate; The effective cross-sectional area of ​​the blower nozzle is smaller than that of the blower tube, and the airflow velocity of the blower tube is equal to that of the blower nozzle. It also includes a fan assembly fixed to the housing assembly for generating the wind force and a heating assembly fixed in the inner cavity; the heating assembly is used to heat the wind force. The suction pipes at both ends of the inner cavity are coaxially arranged with the blowing pipe and are positioned higher than the outlet of the blowing pipe. The suction end of the suction pipe is inserted into the blowing pipe. An annular gap is formed between the suction end and the blowing pipe, and the annular gap is used for the high-pressure airflow to be ejected outward.

2. The uniform flow and temperature heating module according to claim 1, characterized in that, The flow equalization plate has two layers, and the high-voltage zone has two layers.

3. Furnace equipment, characterized in that, Includes the uniform flow and temperature heating module as described in claim 1.

4. The furnace equipment according to claim 3, characterized in that, The furnace equipment is an air furnace or a vacuum reflow oven.

5. The furnace equipment according to claim 4, characterized in that, The heating zone of the vacuum reflow oven is equipped with a uniform flow and temperature heating module, and / or the cooling zone of the vacuum reflow oven is equipped with a uniform flow and temperature module.

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