CN218983491U - Forced cooling device and vacuum reflow soldering furnace - Google Patents
Forced cooling device and vacuum reflow soldering furnace Download PDFInfo
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- CN218983491U CN218983491U CN202222987529.XU CN202222987529U CN218983491U CN 218983491 U CN218983491 U CN 218983491U CN 202222987529 U CN202222987529 U CN 202222987529U CN 218983491 U CN218983491 U CN 218983491U
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Abstract
The utility model relates to the technical field of forced cooling, in particular to a forced cooling device and a vacuum reflow soldering furnace. The forced cooling device has an inner casing with air outlet passage and air inducing mechanism set between the air inlet passage and the air outlet passage; an inner pressurizing plate is fixed in the air outlet duct; the inner pressurizing plate separates the air outlet duct into a first high-pressure area and a second high-pressure area; a refrigerating coil is fixed in the air outlet duct. A vacuum reflow oven is disclosed, comprising a forced cooling apparatus; the forced cooling device is arranged in the cooling area and is used for convection forced cooling. A vacuum reflow oven is disclosed, comprising a forced cooling apparatus; the forced cooling device is connected with the water cooling mechanism and/or the air cooling mechanism. The forced cooling device has high heat exchange efficiency and high cooling rate for the jig; the cooling rate can be adjusted through the refrigerating coil and/or the induced draft mechanism, and the adjustment is convenient and flexible. In addition, this forced cooling device simple structure, simple to operate washs the maintenance after convenient dismantlement. The forced cooling device can be used for the use or transformation of a cooling area of a vacuum reflow oven, and has good applicability.
Description
Technical Field
The utility model relates to the technical field of forced cooling, in particular to a forced cooling device and a vacuum reflow soldering furnace.
Background
Reflow ovens (Reflow ovens) are devices that allow surface mounted components and circuit boards to be reliably bonded together by a solder paste alloy by providing a heated environment that melts the solder paste. The nitrogen protection in the reflow oven prevents the materials which are easy to oxidize, such as soldering tin, silver and the like in the reflow area from being oxidized at a high temperature, so that the welding defect is avoided. With the development of the electronic industry to miniaturization and multiple specifications, the requirements on product quality are higher and higher, so that the vacuum reflow oven with the vacuum device is gradually and widely applied to meet the new demands of the market and reduce the product defects caused by welding. The vacuum device can effectively reduce the size and the number of solder cavities during the welding of the reflow oven, and improve the welding quality.
Vacuum reflow ovens are critical devices for surface mount technology in electronics manufacturing, whose quality and handling directly impact the quality of the final product, and once the soldering process is completed, it becomes very complex and costly to repair defective solder joints, components or circuit boards. The reflow zone has the effect of rapidly increasing the temperature to enable the solder paste to reach a molten state, and the liquid solder wets, diffuses, overflows or reflows the solder pads, component terminals and pins of the PCB to form solder joints. The peak solder reflow temperature varies depending on the solder paste used, and is typically 20-40 c plus the melting point temperature of the solder paste. This helps to promote faster wetting of the solder paste as the viscosity and surface tension of the solder paste decrease with increasing temperature. Thus, ideal reflow soldering is the best combination of peak temperature and solder paste melting time. The ideal temperature profile is the tip region exceeding the melting point of the solder paste, the covered area is minimum and bilateral symmetry, and the soldering time is generally 60-90s.
After the reflow zone, the product cools, solidifies the solder joint, and is ready for subsequent assembly. Controlling the cooling rate is critical, and cooling too quickly may damage the assembly, and cooling too slowly increases the time above the liquid TAL (Time Above Liquids), possibly creating fragile welds. The main point of control of the cooling zone is mainly the cooling rate.
The vacuum reflow oven is generally provided with a jig for passing through the oven, and the cooling rate in a cooling area is insufficient due to the fact that the specific heat capacity of the jig is too large, so that the tapping temperature of the jig is too high. The vacuum furnace needs to be matched with external water cooling, and the effect cannot be achieved by pure circulating air cooling. The water cooling is generally to draw out high-temperature hot air from between the reflux zone and the cooling zone, physically exchange heat with circulating cold water through an ice water machine (a water chiller), cool the hot air and return to the cooling zone. Therefore, rosin can be collected, N2 loss is prevented, and the jig can be cooled. The cooling zone has a similar air duct circulation device as the heating zone. Thus, cold air is mixed after being poured into the air duct device, and the jig is cooled. Because the air after the hot air is subjected to physical heat exchange is cooled, the temperature is not too low, and thus, the efficiency of a cooling area is not too high. If the cooling rate of 6-10 ℃/S is required and is aimed at a jig with large heat capacity, the vacuum reflow oven cannot meet the requirement. Also, since the length of the furnace cooling zone is fixed, the exit plate temperature can be too high (e.g., greater than 120 ℃) and can directly affect downstream processing.
Disclosure of Invention
The utility model aims to provide a forced cooling device and a vacuum reflow soldering furnace so as to solve the technical problem that the cooling effect is poor in the prior art.
In order to achieve the above purpose, on one hand, the technical scheme adopted by the utility model is as follows:
a forced cooling apparatus comprising: an air inlet duct formed between the inner shell and the outer shell; the inner shell is provided with an air outlet air duct communicated with the air inlet air duct, and an air inducing mechanism is arranged between the air inlet air duct and the air outlet air duct; an inner pressurizing plate is fixed in the air outlet duct, and a plurality of holes are formed in the inner pressurizing plate; the inner pressurizing plate separates the air outlet duct into a first high-pressure area and a second high-pressure area; the first high-pressure area is used for uniformly dispersing airflow; and a refrigerating coil is fixed in the air outlet duct.
Preferably, an air inlet of the air inlet duct is connected with an air inlet plate; the air inlets are arranged at two sides of the air outlet and are symmetrical relative to the air outlet; the air inlet plate is provided with a plurality of holes.
Preferably, the air inducing mechanism comprises a fan fixed on the shell; the fan is in transmission connection with an impeller extending into the air inlet channel and/or the first high-pressure area.
Preferably, an air outlet of the air outlet duct is connected with an air blowing plate, and a plurality of holes are formed in the air blowing plate.
Preferably, the refrigeration coil comprises a winding frame and a coil body; the coil body is wound on the winding frame.
Preferably, the coil body has a first waterway connector and a second waterway connector; the first waterway joint is connected with an ice water machine and is used for accessing cold water; the second waterway joint is used for backwater.
Preferably, the coil body is an Ω coil.
On the other hand, the utility model adopts the technical scheme that:
a vacuum reflow oven having a cooling zone; the forced cooling device according to any one of the above; the forced cooling device is arranged in the cooling area and is used for convection forced cooling.
Preferably, a jig is arranged in the vacuum reflow oven.
In yet another aspect, the present utility model adopts the following technical scheme:
a vacuum reflow oven having a hearth; the forced cooling device according to any one of the above; the forced cooling device is fixed at the lower side of the hearth; the forced cooling device is connected with the water cooling mechanism and/or the air cooling mechanism.
The utility model has the beneficial effects that:
the forced cooling device has high heat exchange efficiency and high cooling rate for the jig; the cooling rate can be adjusted through the refrigerating coil and/or the induced draft mechanism, and the adjustment is convenient and flexible. In addition, this forced cooling device simple structure, simple to operate washs the maintenance after convenient dismantlement. The forced cooling device can be used for the use or transformation of a cooling area of a vacuum reflow oven, and has good applicability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is a schematic cross-sectional view (taken along line A-A in FIG. 2) of a forced cooling apparatus according to one embodiment of the present utility model;
FIG. 2 is a schematic top view of FIG. 1;
FIG. 3 is a schematic perspective view of FIG. 1;
FIG. 4 is a schematic perspective view of a refrigeration coil or heat exchanger according to one embodiment;
FIG. 5 is a schematic front view of FIG. 4;
FIG. 6 is a schematic top view of FIG. 4;
fig. 7 is a schematic diagram of the structure of an omega coil in one embodiment.
Reference numerals:
1-a housing; 2-an inner shell; 3-retroverted impellers; 4-a fan; 5-a refrigeration coil; 6-an air inlet plate; 7-blowing the air plate; 8-an inner pressurizing plate; 9-waterway interfaces; 10-self-sealing valved joint; 11-waterway joint; 12-an air inlet duct; 13-an air outlet duct; 14-a first high-voltage zone; 15-a second high-voltage zone; 16-an induced draft mechanism; 21-coil body; 22-rear mounting angle iron; 23-front mounting angle iron; 24-winding the frame.
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.
Please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.
Example 1
Referring to fig. 1-7, the present utility model provides a forced cooling device, comprising: an air inlet duct 12 formed between the inner case 2 and the outer case 1; the inner shell 2 is provided with an air outlet duct 13 communicated with the air inlet duct 12, and an air inducing mechanism 16 is arranged between the air inlet duct 12 and the air outlet duct 13; an inner pressurizing plate 8 is fixed in the air outlet duct 13, and a plurality of holes are formed in the inner pressurizing plate 8; the inner pressurizing plate 8 separates an air outlet duct 13 into a first high-pressure area 14 and a second high-pressure area 15; the first high pressure zone 14 is used to uniformly disperse the gas flow; a refrigeration coil 5 is fixed in the air outlet duct 13, and preferably, the refrigeration coil 5 is fixed in the second high-pressure area 15.
The induced air mechanism 16 works, and air flow enters from the air inlet duct 12, flows through the induced air mechanism 16 and then enters the first high-pressure area 14 to uniformly disperse the air flow, so that dead zones of wind speed are eliminated. The uniform air flow enters the second high-pressure area 15, and the air flow and the refrigeration coil 5 (circulating cold water is introduced into the refrigeration coil 5) perform full heat exchange, so that the temperature of the air flow is reduced and the air flow is blown out. And blowing out the cooled air flow, and performing forced convection heat exchange with the jig. The air flow is continuously circulated and reciprocated, thereby achieving the effect of forced cooling.
The external transmission mechanism in the vacuum high-temperature occasion is further improved as follows:
in one embodiment, an air inlet of the air inlet duct 12 is connected with an air inlet plate 6; the air inlets are arranged at two sides of the air outlet and are symmetrical relative to the air outlet; the air inlet plate 6 is provided with a plurality of holes. Preferably, the air inlet plate 6 is provided with 2, and the air inlet plate 6 is provided with a filter screen.
In one embodiment, the air induction mechanism 16 comprises a fan 4 fixed on the housing 1; the fan 4 is in transmission connection with an impeller which extends into the air inlet channel and/or the first high-pressure zone 14. The rotating speed of the fan 4 is regulated by a frequency converter, and the impeller is driven by the fan 4 to generate circulating wind. Preferably, the impeller is set as a retroverted impeller 3.
In one embodiment, the air outlet of the air outlet duct 13 is connected with a blower plate 7, and a plurality of holes are formed in the blower plate 7. And uniform cold air is blown out from the air blowing plate 7 for forced cooling.
In one embodiment, the refrigeration coil 5 includes a winding frame 24 and a coil body 21; the coil body 21 is wound on a winding frame 24. Preferably, the coil body 21 has a first waterway connector and a second waterway connector; the first waterway joint is connected with an ice water machine and is used for receiving cold water, and the cold water circularly refrigerates the air flow flowing through the refrigeration coil 5; the second waterway joint is used for backwater. Preferably, the coil body 21 is an Ω coil. The heat exchange efficiency of the omega coil is higher.
It is generally intuitive that the temperature should be slowly lowered to counteract thermal shock of the components and pads. However, slow cooling of solder paste reflow soldering forms more coarse grains, generating larger Ag in the interface layer and the interior of the solder joint 3 Sn、Cu 6 Sn 5 Inter-metallic compound particles. Reducing the mechanical strength of the welding spotsDegree and thermal cycle life, and may cause a dull, low gloss or even a matt spot. Conclusion from many solder laboratory studies: the rapid cooling is beneficial to obtaining stable and reliable welding spots.
The forced cooling device can achieve a better forced cooling effect. And the rapid cooling can form smooth, uniform and thin intermetallic compounds, and form fine tin-rich dendrites and fine grains dispersed in a tin matrix, so that the mechanical property and reliability of the welding spot are obviously improved.
It should be noted that in production applications, it is not the larger the cooling rate, the better. Consideration is given to the cooling capacity of the reflow soldering apparatus, and the thermal shock that the board, components and pads can withstand. A balance should be struck between the board and the components while ensuring solder joint quality. The minimum cooling rate should be above 2.5 deg.c/S and the optimum cooling rate above 3 deg.c/S. Considering the thermal shock that components and PCBs can withstand, the maximum cooling rate should be controlled at 6-10 c/S. When the factory selects equipment, it is preferable to select reflow soldering with water cooling function to obtain a strong cooling capacity reserve.
Example two
Referring to fig. 1-7, the present utility model provides a forced cooling device, and the technical solution thereof is systematically described below from another aspect, so as to facilitate a comprehensive understanding of the present technology. The contents of this second embodiment can be used together with the embodiments to supplement the description.
A forced cooling device adopts the following structure:
an air channel is formed between the outer shell 1 and the inner shell 2 (an opening at the impeller), and an air suction port is formed at the position of 2 air inlet plates 6 (holes and a filter screen are arranged on the air inlet plates);
the air blowing plate 7 (with holes on it) is an air outlet;
a first high-pressure area 14 is generated between the inner pressurizing plate 8 (with holes on the inner surface) and the inner shell 2, so that the air flow is convenient to be uniformly dispersed, and the dead zone of wind speed is eliminated;
a second high-pressure area 15 is formed between the inner pressurizing plate 8 and the blowing plate 7, the air flow and the refrigerating coil 5 perform full heat exchange, and the air flow is blown out after the temperature of the air flow is reduced; the cooled air flow is blown out and subjected to forced convection heat exchange with the jig, and the air flow is continuously circulated and reciprocated, so that the product is cooled;
the self-sealing valve joint 10 is formed by combining a male head and a female head, wherein the male head is connected with the refrigeration coil 5, and the female head is connected with the waterway interface 9; the self-sealing joint 10 with a valve is connected with a waterway when combined, and the waterway is disconnected and is sealed in two directions when disconnected, so that water is not sprayed out; the self-sealing valved fitting 10 may be a quick fitting of the Misumi brand type qpfc 3; it will be appreciated that the present self-sealing valved fitting 10 may be provided as a valve, possibly with the valve being more convenient in operation than the self-sealing valved fitting 10;
the refrigerating coil 5 and the waterway connector 9 are connected through the self-sealing valve-carrying joint 10, so that the refrigerating coil 5 can be quickly combined or separated by hand, and the refrigerating coil 5 can be conveniently taken out for cleaning and then is restored;
the waterway joint 11 is provided with 2 waterways, 1 waterway joint is connected with cold water pumped out by the ice water machine through a hose, and 1 waterway joint is used for backwater;
the impeller is driven by a fan 4 to generate circulating wind;
the rotating speed of the fan 4 is regulated by a frequency converter;
the refrigeration coil 5 has a coil body 21, rear mounting angle irons 22, front mounting angle irons 23 and a winding frame 24; the winding frame 24 is a welding frame, 4 steel pipes are supported and positioned, and winding guide grooves are formed in the upper part and the lower part of each 3 plates, so that the coil pipe body 21 can be wound conveniently; the coil pipe entering and exiting the winding frame 24 is tightly tied by steel wires or Teflon bands and the like to prevent loosening; the rear mounting angle iron 22 and the front mounting angle iron 23 are provided with waist-shaped holes, so that the positions between the rear mounting angle iron and the front mounting angle iron can be adjusted conveniently, and the rear mounting angle iron and the front mounting angle iron are mounted to the outer shell 1/the inner shell 2 conveniently; the tail end of the coil pipe body 21 is welded with a joint, so that the coil pipe body is convenient to connect with a male joint of the self-sealing valved joint 10; wherein, the coil body 21 is a stainless steel pipe which is subjected to special treatment, has thin wall thickness, 1.6MPa pressure resistance and high pressure resistance, and cannot burst; the coiled pipe is not rebounded after winding, the stress is small, and the shaping is convenient; the wall thickness is thin so as to be convenient for heat exchange; the material is 316L stainless steel, and is corrosion-resistant.
In the technical scheme, the omega coil pipe can be wound for a plurality of times to be used as a heat exchanger (the heat exchanger can be understood as a refrigeration coil pipe 5); the interface of the heat exchanger is self-sealed and provided with a valve, so that the heat exchanger is convenient to detach, does not need tools, and is convenient to clean and install; circulating water is arranged in the heat exchanger, and the external ice water machine cools the circulating water; the water outlet temperature of the ice water machine is adjustable; the motor speed of the fan 4 is regulated by a frequency converter.
The utility model aims to solve the problems in the prior art, can adopt 3 sets of heat exchanger devices in the form of omega coil pipes to perform direct physical forced heat exchange cooling, and can meet the requirement of a process curve by adjusting the water temperature of water entering the heat exchanger and the rotating speed of a fan 4 (combining the physical characteristics of a jig), so that the cooling rate of the jig is adjustable and controllable, and the process treatment range of a vacuum furnace is enlarged. Typically, the water outlet temperature of the water chiller is generally adjustable between 6 ℃ and 25 ℃, and cold water circulates in the coil body 21; the fan 4 blows out high-speed air flow, and cold air is directly blown onto the jig to perform physical heat exchange and cooling. Wherein the heat exchanger in the form of an omega coil is replaced by a heat exchanger in other forms; the self-sealing valved fitting 10 may be replaced with other types of fittings. The omega coil heat exchanger is internally provided with a cooling module, the air outlet is high-speed and continuous and uniform, no air blowing dead angle exists, and the cooling efficiency is improved. The omega coil heat exchanger is adopted, no fins are arranged, and the cleaning is convenient.
Example III
Referring to fig. 1-7, the present utility model provides a vacuum reflow oven having a cooling zone; the forced cooling device according to any one of the above; the forced cooling device is arranged in the cooling area and is used for convection forced cooling. In general, a jig is provided in the vacuum reflow oven. The forced air cooling device works to forcedly blow and cool the jig, so that products on the jig are cooled.
Example IV
Referring to fig. 1-7, the present utility model provides a vacuum reflow oven having a hearth; the forced cooling device according to any one of the above; the forced cooling device is fixed at the lower side of the hearth; the forced cooling device is connected with the water cooling mechanism and/or the air cooling mechanism. The forced cooling device combines the existing water cooling mechanism and air cooling mechanism, the forced cooling effect is better, and the resource utilization rate is higher.
Specifically, the forced cooling device is arranged at the lower side of the hearth, and can be combined with the existing water cooling or air cooling mode at the upper side of the hearth to force convection to blow cold air for circulation, so that the cooling efficiency of the vacuum furnace is further enhanced. The heat exchanger (refrigeration coil 5) is convenient and detachable; when the heat exchanger is cleaned, the hearth is opened, and the self-sealing joint 10 with the valve can be taken out by loosening the self-sealing joint with the valve by hand; and (5) mounting the same. The outer surface of the coil body 21 is smooth, fins are not arranged, and the cleaning is convenient.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. A forced cooling apparatus, comprising: an air inlet duct formed between the inner shell and the outer shell; the inner shell is provided with an air outlet air duct communicated with the air inlet air duct, and an air inducing mechanism is arranged between the air inlet air duct and the air outlet air duct; an inner pressurizing plate is fixed in the air outlet duct, and a plurality of holes are formed in the inner pressurizing plate; the inner pressurizing plate separates the air outlet duct into a first high-pressure area and a second high-pressure area; the first high-pressure area is used for uniformly dispersing airflow; and a refrigerating coil is fixed in the air outlet duct.
2. The forced cooling device of claim 1, wherein the air inlet of the air inlet duct is connected with an air inlet plate; the air inlets are arranged at two sides of the air outlet and are symmetrical relative to the air outlet; the air inlet plate is provided with a plurality of holes.
3. The forced cooling apparatus of claim 1 wherein the induced draft mechanism includes a blower secured to the housing; the fan is in transmission connection with an impeller extending into the air inlet channel and/or the first high-pressure area.
4. A forced cooling apparatus according to any one of claims 1-3, wherein the outlet of the outlet duct is connected to a blowing plate, and the blowing plate is provided with a plurality of holes.
5. The forced cooling apparatus of claim 1 wherein the refrigeration coil includes a winding frame and a coil body; the coil body is wound on the winding frame.
6. The forced cooling apparatus of claim 5 wherein the coil body has a first waterway connector and a second waterway connector; the first waterway joint is connected with an ice water machine and is used for accessing cold water; the second waterway joint is used for backwater.
7. A forced cooling apparatus according to claim 5 or 6, wherein the coil body is provided as an Ω coil.
8. A vacuum reflow oven having a cooling zone; -further comprising a forced cooling device according to any one of claims 1-7; the forced cooling device is arranged in the cooling area and is used for convection forced cooling.
9. The vacuum reflow oven of claim 8, wherein a jig is disposed in the vacuum reflow oven.
10. A vacuum reflow oven having a hearth; -further comprising a forced cooling device according to any one of claims 1-7; the forced cooling device is fixed at the lower side of the hearth; the forced cooling device is connected with the water cooling mechanism and/or the air cooling mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222987529.XU CN218983491U (en) | 2022-11-10 | 2022-11-10 | Forced cooling device and vacuum reflow soldering furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222987529.XU CN218983491U (en) | 2022-11-10 | 2022-11-10 | Forced cooling device and vacuum reflow soldering furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218983491U true CN218983491U (en) | 2023-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222987529.XU Active CN218983491U (en) | 2022-11-10 | 2022-11-10 | Forced cooling device and vacuum reflow soldering furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218983491U (en) |
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2022
- 2022-11-10 CN CN202222987529.XU patent/CN218983491U/en active Active
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