TWI818623B - Vacuum assisted reflow oven with remote hot air pressure control and uniform radiant heat - Google Patents

Abstract

A vacuum reflow oven with remote hot air pressure control and uniform radiant heat includes an oven body, an in-oven heating device, a remote heating device, an reflection fan device and a vacuum system. A chamber is arranged in the oven body. A reflective layer and the reflection fan device are disposed in the chamber. The in-oven heating device which can generate radiant heat is disposed in the chamber. The remote heating device which can deliver hot air into the chamber is outside the chamber and connected with the chamber. The reflection fan device is set up inside the chamber of the oven body. The reflection fan device includes a motor and multi-reflection fan blades. The motor can drive the multi-reflection fan blades to rotate. The surface of the reflection fan blade is coated with high-reflection film. The infrared reflection fan device can reflect radiant heat, so that the radiant heat can be distributed uniformly. The vacuum system is connected to the chamber to vacuum the chamber. By using the reflective layer and the reflection fan device, the oven can efficiently eliminate the Shadow Effect of radiation to improve bonding effect.

Description

Vacuum reflow oven with remote hot air pressure control and even distribution of radiant heat

The invention relates to a reflow furnace, in particular to a vacuum reflow furnace with remote hot air pressure control and uniform distribution of radiant heat.

It is known that a reflow furnace is a heating furnace that can be used to heat an electronic substrate (PCB) to melt the solder, thereby welding the electronic substrate and electronic components. However, it is known that the radiant heat of a reflow furnace cannot be distributed evenly, and it is easy to produce a radiation shadow effect, resulting in poor reflow results.

The technical problem to be solved by the present invention is to provide a vacuum reflow oven with remote hot air pressure control and uniform distribution of radiant heat, which can eliminate the radiation shadow effect, increase the uniformity of radiant heating, and improve the reflow rate. welding effect.

In order to solve the above technical problems, the present invention provides a vacuum reflow furnace with remote hot air pressure control and uniform distribution of radiant heat. The heating process sequentially includes a heating section, a hot melting section, a heat preservation section and a cooling section. Cooling section, the vacuum reflow furnace includes: a furnace body, the interior of the furnace body is provided with a chamber, the inner wall of the chamber is provided with an inner wall reflective layer; an internal heating device, the internal heating device is provided in the cavity Indoor, radiant heat can be generated, and the internal heating device is used for heating the temperature rising section, the hot melt section and the heat preservation section; a remote heating device is arranged on the chamber. Externally, the remote heating device is connected to the chamber. The remote heating device imports hot air into the chamber along with inert gas, reactive gas or high-pressure air. The remote heating device is used for the heating section and the hot melt. section heating; a reflection fan device, the reflection fan device is arranged in the cavity of the furnace body, the reflection fan device includes a motor and a plurality of reflection fan blades, these reflection fan blades are connected to the motor, the motor can drive The reflective fan blades rotate, and the surfaces of the reflective fan blades are provided with reflective layers. The reflective fan device can reflect radiant heat and distribute the radiant heat evenly. The reflective fan blades can rotate and swing at the same time. The reflective fan device can control The rotation speed and swing frequency of the reflection fan device can be used to produce radiation reflection lines at different angles with the inner wall reflection layer of the chamber. When the reflection fan device is activated in the insulation section, it can reflect radiant heat in all directions. , to eliminate the radiation shadow effect, the reflection fan installed in the hot melt section can help stir the hot air in the furnace body, forming good convection heating; and a vacuuming equipment, the vacuuming equipment is connected to the chamber, and can The chamber is evacuated, and the vacuum equipment is used in the insulation section.

Preferably, the hot melt section and the heat preservation section last for about 1 to 3 minutes.

Preferably, the reflection fan blades are respectively connected to a driving device, the driving device is fixed to a rotating shaft of the motor, and the driving device can drive the reflection fan blades to swing.

Preferably, each of the reflection fan blades has a longitudinal axis, and the longitudinal axis is located at the longitudinal center of the reflection fan blade. The driving device can drive the reflection fan blade to repeatedly swing along the longitudinal axis, so that the reflection fan blade can swing repeatedly along the longitudinal axis. Some reflection fan blades can rotate and swing at the same time.

Preferably, the longitudinal axes of the reflection fan blades are arranged horizontally.

The beneficial effect of the present invention is that the remote hot air pressure controlled vacuum reflow furnace provided by the present invention can evenly distribute radiant heat, including a furnace body, an internal heating device, a remote heating device, and a reflection fan device. and a vacuuming equipment. There is a chamber inside the furnace body, and the chamber is equipped with an inner wall reflection layer and a reflection fan device. The internal heating device is installed in the chamber and can generate radiant heat. The internal heating device is used for heating the temperature rising section, the hot melt section and the heat preservation section. The remote heating device is installed in the cavity Outside the chamber, a remote heating device is connected to the chamber. The remote heating device can transport hot air into the chamber. The remote heating device is used to heat the heating section and the hot melt section. The reflection fan device is installed in the cavity of the furnace body. The reflection fan device includes a motor and a plurality of reflection fan blades. The motor can drive the reflection fan blades to rotate. The surfaces of the reflection fan blades are provided with a reflection layer. The reflection fan device can Reflect radiant heat to evenly distribute radiant heat. The vacuuming equipment is connected to the chamber and can evacuate the chamber. The vacuuming equipment is used in the heat preservation section. The present invention utilizes the inner wall reflective layer and the reflective fan device to eliminate the radiation shadow effect and improve the reflow effect. Furthermore, the remote heating device is installed outside the chamber. The remote heating device heats the gas outside the chamber of the furnace body, forms hot air, and then transports the hot air into the chamber. This can make the structure inside the chamber simple. The heat capacity is small and it is easy to heat and cool the heated object.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not used to limit the present invention.

1: Furnace body

11: Chamber

12:Transmission system

13:Inner wall reflective layer

14:Lower furnace body

15: Upper furnace body

16: Airtight parts

17:Lifting mechanism

18: Plasma reserved hole

2: Internal heating device

21:External heater

3: Remote heating device

4: Reflective fan device

41: Motor

411:Rotation axis

42: Reflector fan blades

421: Longitudinal axis

43: Reflective layer

44:Driving device

5: Vacuum equipment

100: Heated object

Figure 1 is a schematic diagram of a vacuum reflow oven with remote hot air pressure control and uniform distribution of radiant heat according to the present invention.

Figure 2 is a program diagram of the operation of the vacuum reflow furnace of the present invention.

Figure 3 is a schematic diagram of the operation of the reflective fan device of the present invention.

The following is a description of the relevant implementation modes disclosed in the present invention through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments. Various details in this specification can also be modified and modified based on different viewpoints and applications without departing from the concept of the present invention. change. In addition, the drawings of the present invention are only simple schematic illustrations and are not depictions based on actual dimensions, as is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of the present invention. In addition, the term "or" used in this article shall include any one or combination of more of the associated listed items depending on the actual situation.

[Example]

Please refer to Figures 1 and 2. The present invention provides a vacuum reflow oven with remote hot air pressure control and uniform distribution of radiant heat. The inner wall reflective layer and reflective fan device can eliminate the radiation shadow effect and improve the reflow effect. . The heating process, as shown in the program chart in Figure 2, sequentially includes a heating section, a hot melt section, a heat preservation section and a cooling section. The hot melt section and the heat preservation section take about 1 to 3 minutes in total to obtain better results. The reflow effect. The vacuum reflow furnace includes a furnace body 1, an internal heating device 2, a remote heating device 3, a reflection fan device 4 and a vacuum equipment 5.

The furnace body 1 is provided with a chamber 11 inside, and a transmission system 12 can be provided in the chamber 11. The transmission system 12 can be fixed, rotating or in-and-out, etc., and can quickly transport the heated object 100 to the chamber. In the room 11, in this embodiment, the transport system 12 is a track mechanism, and the heated object 100 is placed in the transport system 12 (track mechanism) to facilitate entry and exit. The heated object 100 can be an electronic substrate (PCB), etc., and is not limited thereto. The inner wall of the chamber 11 is provided with an inner wall reflective layer 13. The inner wall reflective layer 13 is made of a highly reflective material. The thickness of the inner wall reflective layer 13 is not limited. The inner wall reflective layer 13 can also be a reflective material. membrane. The furnace body 1 can be a continuous furnace or a single furnace body, and the type of the furnace body 1 is not limited.

In this embodiment, the furnace body 1 includes a lower furnace body 14 and an upper furnace body 15. The upper furnace body 15 is disposed above the lower furnace body 14. The upper furnace body 15 is disposed on the lower furnace body 14 so as to be lifted and lowered. , so that the upper furnace body 15 can be placed on the lower furnace body 14 to seal the chamber 11 between the lower furnace body 14 and the upper furnace body 15 . An airtight component 16 can be provided between the lower furnace body 14 and the upper furnace body 15 to increase airtightness. in reality In this embodiment, the upper furnace body 15 is connected to a lifting mechanism 17 , which can be a driving mechanism such as a cylinder or a motor. The lifting mechanism 17 can push the upper furnace body 15 up and down to open and close the furnace body 1 . In addition, the furnace body 1 may also be provided with a plasma reserved hole 18 so that plasma can be input through the plasma reserved hole 18 .

The internal heating device 2 can be an infrared heater, that is, the internal heating device 2 can include one or more infrared heaters 21, preferably multiple external heaters 21. The infrared heaters 21 consume less power and have high thermal efficiency. , but the structure of the internal heating device 2 is not limited. The internal heating device 2 is disposed in the chamber 11 and can generate radiant heat. The internal heating device 2 is used for heating the temperature rising section, the hot melting section and the heat preservation section. It is turned on in the heating section and the hot melting section (as shown in Figure 2), and can assist the hot air from the remote heating device 3 to heat the solder of the heated object 100. When turned on in the heat preservation section, the solder hot melt temperature can be maintained.

The remote heating device 3 is arranged outside the chamber 11 and is connected to the chamber 11. The remote heating device 3 heats the gas outside the chamber 11 of the furnace body 1 to form hot air. The hot air is then delivered to the chamber 11. The remote heating device 3 is used for heating the temperature rise section and the hot melt section, as shown in the program diagram of Figure 2, and can also input inert gas, reactive gas or high-pressure air, etc. The mode of the remote heating device 3 is not limited, and may be various heating modes such as electric heating or gas heating. The number of the remote heating device 3 is not limited to one. For example, it can also be added to two, three or four as needed.

The reflection fan device 4 is arranged in the furnace body 1. Preferably, the reflection fan device 4 is arranged above the object to be heated 100. The internal heating device 2 can be located between the object to be heated 100 and the reflection fan device 4. Get better uniform heating effect. As shown in Figure 3, the reflection fan device 4 includes a motor 41 and a plurality of reflection fan blades 42. The reflection fan blades 42 are connected to the motor 41, that is, the reflection fan blades 42 can be connected to a rotation of the motor 41. The shaft 411, when the motor 41 is started, can drive the reflection fan blades 42 to rotate. The reflection fan blades 42 are arranged in the chamber 11. The reflective fan blades 42 are provided with a reflective layer 43 on their surface. The reflective layer 43 is made of a highly reflective material. The reflective layer 43 can be reflective paint. The thickness of the reflective layer 43 is not limited, and the reflective layer 43 may also be a reflective film.

As shown in Figure 3, preferably, the reflection fan blades 42 can be connected to a driving device 44 respectively. The driving device 44 can be a motor or a cylinder, and the driving device 44 is fixed to the rotating shaft 411 of the motor 41. The reflection fan blades 42 are respectively connected to the motor 41 through the driving device 44 . When the motor 41 is started, it can drive the reflection fan blades 42 to rotate, and the driving device 44 can be used to drive the reflection fan blades 42 to swing. That is, each of the reflection fan blades 42 has a longitudinal axis 421, and the longitudinal axis 421 is located at The driving device 44 can drive the reflection fan blade 42 to swing repeatedly along the longitudinal axis 421 according to the longitudinal center position of the reflection fan blade 42 . Preferably, the longitudinal axes 421 of the reflection fan blades 42 are arranged horizontally to reflect radiant heat in all directions.

These reflection fan blades 42 can rotate and swing at the same time (the rotation speed and swing frequency can be controlled). The reflection fan device 4 that can be changed at various angles can reflect radiant heat in all directions. This device is activated in the heat preservation section (infrared heating stage). , can produce radiation reflection lines at different angles, eliminate the radiation shadow effect, and increase the uniformity of radiation heating. In addition, the reflection fan device 4 in the hot melt section can help stir the hot air in the furnace body 1, form good convection heating, and reduce the temperature difference.

The vacuuming equipment 5 is connected to the chamber 11 and can evacuate the chamber 11 and extract air bubbles from the solder joints to prevent the solder from forming holes. The vacuum equipment 5 is shown in the program diagram of Figure 2 and is mainly used in the heat preservation section. At this time, the remote heating device 3 is turned off.

[Beneficial effects of the embodiment]

The beneficial effect of the present invention is that the remote hot air pressure controlled vacuum reflow furnace provided by the present invention can evenly distribute radiant heat, including a furnace body, an internal heating device, a remote heating device, and a reflection fan device. and a vacuuming equipment. There is a chamber inside the furnace body, and the chamber is equipped with an inner wall reflection layer and a reflection fan device. The internal heating device is installed in the chamber and can generate radiant heat. The internal heating device is used for heating the temperature rising section, the hot melt section and the heat preservation section. The remote heating device is installed outside the chamber and is connected to the chamber. The remote heating device can transport hot air into the chamber. The remote heating device is used for heating the temperature rising section and the hot melt section. The reflection fan device is installed in the cavity of the furnace body. The reflection fan device includes a motor and a plurality of reflection fan blades. The motor can drive the reflection fan blades to rotate. The surfaces of the reflection fan blades are provided with a reflection layer. The reflection fan device can Reflect radiant heat to evenly distribute radiant heat. The vacuuming equipment is connected to the chamber and can evacuate the chamber. The vacuuming equipment is used in the heat preservation section. The present invention uses the reflective fan device to eliminate the radiation shadow effect and improve the reflow effect. Furthermore, the remote heating device is installed outside the chamber. The remote heating device heats the gas outside the chamber of the furnace body, forms hot air, and then transports the hot air into the chamber. This can make the structure inside the chamber simple. The heat capacity is small and it is easy to heat and cool the heated object.

The contents disclosed above are only preferred and feasible embodiments of the present invention, and do not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

1: Furnace body

11: Chamber

12:Transmission system

13:Inner wall reflective layer

14:Lower furnace body

15: Upper furnace body

16: Airtight parts

17:Lifting mechanism

18: Plasma reserved hole

2: Internal heating device

21:External heater

3: Remote heating device

4: Reflective fan device

41: Motor

42: Reflector fan blades

43: Reflective layer

5: Vacuum equipment

100: Heated object

Claims (8)

A vacuum reflow furnace with remote hot air pressure control and uniform distribution of radiant heat. The heating process includes a heating section, a hot melting section, a heat preservation section and a cooling section. The hot melt section and the heat preservation section are The vacuum reflow furnace includes: a furnace body, the interior of the furnace body is provided with a chamber, the inner wall of the chamber is provided with an inner wall reflective layer; an internal heating device, the internal heating device Disposed in the chamber, capable of generating radiant heat, the internal heating device is used for heating the temperature rising section, the hot melt section and the heat preservation section; a remote heating device, the remote heating device is arranged outside the chamber, The remote heating device is connected to the chamber. The remote heating device imports hot air into the chamber along with inert gas, reactive gas or high-pressure air. The remote heating device is used for the heating section and the hot melt section. Heating; a reflection fan device, the reflection device is arranged in the cavity of the furnace body, the reflection fan device includes a motor and a plurality of reflection fan blades, the reflection fan blades are connected to the motor, the motor can drive the reflection fans The fan blades rotate, and the surfaces of the reflective fan blades are provided with reflective layers. The reflective fan device can reflect radiant heat and distribute the radiant heat evenly. The reflective fan blades can rotate and swing at the same time. The reflective fan device can control the rotation speed and swing. Frequency, using the rotation speed and swing frequency of the reflection fan device, combined with the inner wall reflection layer of the chamber, can produce radiation reflection lines at different angles. When the reflection fan device is activated in the insulation section, it can reflect radiant heat in all directions and eliminate radiation. Shadow effect, the reflection fan installed in the hot melt section can help stir the hot air in the furnace body to form good convection heating; and a vacuum equipment, the vacuum equipment is connected to the chamber and can vacuum the chamber , the vacuum equipment is used in the insulation section. The vacuum reflow furnace with remote hot air pressure control and uniform distribution of radiant heat as described in claim 1, wherein the furnace body includes a lower furnace body and an upper furnace body, and the upper furnace body is arranged on the lower furnace body. Above, the upper furnace body is connected to a lifting mechanism, which can push the upper furnace body up and down to open and close the furnace body. The vacuum reflow oven with remote hot air pressure control and uniform distribution of radiant heat as described in claim 1, wherein the internal heating device is an infrared heater. A remote hot air pressure controlled vacuum reflow furnace capable of evenly distributing radiant heat as described in claim 1, wherein the reflection fan blades are respectively connected to a driving device, and the driving device is fixed to a rotating shaft of the motor, The driving device can drive the reflection fan blades to swing, and when the motor is started, it can drive the reflection fan blades to rotate. The vacuum reflow furnace with remote hot air pressure control and uniform distribution of radiant heat as described in claim 4, wherein each of the reflective fan blades has a longitudinal axis located at the longitudinal center of the reflective fan blade. position, the driving device can drive the reflection fan blade to swing repeatedly along the longitudinal axis. As claimed in claim 5, a vacuum reflow oven with remote hot air pressure control and uniform distribution of radiant heat is provided, in which the longitudinal axes of the reflective fan blades are arranged horizontally. A remote hot air pressure-controlled vacuum reflow oven capable of evenly distributing radiant heat as described in claim 1, wherein the chamber is provided with a transmission system capable of transporting heated objects into the chamber. The vacuum reflow oven with remote hot air pressure control and uniform distribution of radiant heat as described in claim 7, wherein the internal heating device is located between the heated object and the reflection fan device.

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