Circulating type baking device

Abstract

A circulating baking device comprises an oven, a heating unit and a fan unit. The oven comprises an inner shell, at least one outer shell surrounding the outer side of the inner shell and an outer oven body surrounding the outer shell, a baking space is defined by the inner shell, at least one flow guide space surrounding the outer side of the inner shell is defined by the inner shell and the outer shell jointly, a heat insulation layer is defined by the outer shell and the outer oven body jointly, and the heat insulation layer is arranged between the inner shell and the outer oven body. And the baking space is communicated with the flow guide space. And the heating unit is arranged in the oven. The fan unit is arranged at one end of the oven and used for driving gas to circularly flow in the baking space and the flow guide space, and the gas is heated when passing through the heating unit.

Description

Technical Field

[0001] The invention relates to a baking device, in particular to a circulating baking device. Background Art

[0002] Ovens are common machines and equipment in the semiconductor industry, such as packaging. They are mainly used to heat and cure an electronic product to be processed, solidify it into a shape, and remove bubbles in the electronic product. Curing applications include but are not limited to chip curing, die bonding curing, pre-baking, re-baking, flip chip curing, heat sink bonding curing, etc. However, existing ovens still have room for improvement. Summary of the invention

[0003] Therefore, an object of the present invention is to provide a circulating baking device that reduces the loss of gas heat energy.

[0004] Therefore, a circulation baking device proposed according to the present invention includes an oven, a heating unit, and a fan unit. The oven includes an inner shell, at least one outer shell surrounding the outer side of the inner shell, and an outer box surrounding the outer shell, the inner shell defines a baking space, the inner shell and the outer shell jointly define at least one guide space surrounding the outer side of the inner shell, the outer shell and the outer box jointly define a thermal insulation layer, and the baking space and the guide space are connected. The heating unit is disposed in the oven. The fan unit is disposed at one end of the oven, and is used to drive the gas to circulate in the baking space and the guide space, and the gas is heated and heated when passing through the heating unit.

[0005] In some embodiments, the thermal insulation layer is a thermal insulation space separated from the outer shell and the outer box.

[0006] In some embodiments, the inner shell has a plurality of return air plates, the return air plates together define the baking space, and each return air plate has a plurality of air guide holes.

[0007] In some embodiments, the heating unit includes a plurality of electric heating rods arranged in a circle in the flow guiding space.

[0008] In some embodiments, the inner shell also has a shell connected to the return air plate, and the circulating baking device includes a plurality of outer shells that are spaced apart from each other and surround the outer side of the inner shell. The outer shells, together with the return air plate and the shell, respectively define a plurality of guide spaces surrounding the outer side of the inner shell, and the heating unit includes a plurality of electric heating rods correspondingly arranged in the guide spaces.

[0009] In some embodiments, the inner shell further defines a heating space connected to the baking space, and the heating unit includes a heater disposed in the heating space.

[0010] In some embodiments, an air regulating plate is further included and is disposed between the fan unit and the baking space.

[0011] In some embodiments, a filter layer is further included and disposed between the fan unit and the air regulating plate.

[0012] In some embodiments, the inner shell has an air inlet connected to the baking space, and the circulating baking device further includes an air collecting ring arranged at the air inlet.

[0013] In some embodiments, the electric heating rod is fixed to the outer box.

[0014] The beneficial effects of the present invention are as follows: by arranging a heating unit in the oven, the gas is continuously heated by the heating unit during the process of circulating the gas from the guide space back to the baking space, and by jointly defining a thermal insulation layer between the outer shell and the outer box body, the heat energy in the gas is reduced from being lost from the outer shell and the outer box body through heat conduction, thereby improving the overall operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0016] Figure 1 is a schematic diagram, exemplarily illustrating a first embodiment of a circulating baking device according to an embodiment of the present invention;

[0017] Figure 2 This is an exemplary description of an embodiment of the present invention. Figure 1 a schematic cross-sectional view taken along line II-II in FIG. 1 ; and

[0018] Figure 3 2 is a cross-sectional schematic diagram, which exemplarily illustrates the second embodiment of the circulating baking device described in the embodiment of the present invention. DETAILED DESCRIPTION

[0019] Before the present invention is described in more detail, it should be noted that, where appropriate, reference numerals have been repeated among the drawings to indicate corresponding or similar components, which may have similar characteristics where appropriate.

[0020] See also Figure 1 , exemplarily illustrating a first embodiment of a circulating baking device 100 according to an embodiment of the present invention, comprising an oven 1, a fan unit 2, a heating unit 3, an air collecting ring 4, and an air regulating plate 5.

[0021] The oven 1 includes an inner shell 11, a plurality of outer shells 12 that surround the outer side of the inner shell 11 at intervals, an outer box body 13 that surrounds the outer side of the outer shell 12, and a door 14 disposed at one end of the outer box body 13. In this embodiment, the inner shell 11 has four return air plates 111, a shell 112 connected to the side of the return air plates 111 that is farther away from the door 14, and an air inlet 113 formed in the shell 112 and away from the door 14. Each return air plate 111 has a plurality of air guide holes. In this embodiment, two of the return air plates 111 are spaced apart in a vertical direction D1, and the other two return air plates 111 are spaced apart in a left-right direction D2 to surround and jointly define a baking space 114. The shell 112 defines a heating space 115 that is connected to the baking space 114. In a variation of implementation, the number of the return air plates 111 is not limited to four, and the arrangement is not limited to the above.

[0022] In this embodiment, the outer shell 12 is four in number, and together with the return air plate 111 and the shell 112, defines four guide spaces 15 surrounding the outer side of the inner shell 11. The guide space 15 is connected to the baking space 114 through the air guide hole and the air inlet 113. In a variant implementation, the outer shell 12 can also be only one in number and surround the outer side of the inner shell 11, and together with the inner shell 11, defines a guide space 15 surrounding the outer side of the inner shell 11.

[0023] refer to Figure 2 The outer box 13 and the housing 12 are spaced apart to define a thermal insulation layer 16, and the thermal insulation layer 16 is a hollow thermal insulation space in this embodiment. In a variant implementation, the thermal insulation layer 16 can also be made of a material or process gas with a thermal conductivity lower than 50 W / mK.

[0024] The fan unit 2 is disposed at one end of the oven 1 and is used to drive the gas to circulate in the baking space 114 and the guide space 15. Specifically, the fan unit 2 is disposed at one end of the outer box 13 opposite to the door 14, and includes a driving motor 21, a transmission shaft 22 connected to the driving motor 21, and a wind wheel 23 connected to the transmission shaft 22 and located between the air inlet 113 and the heating space 115. The driving motor 21 is used to drive the transmission shaft 22, so that the wind wheel 23 is driven by the transmission shaft 22 to rotate, and the gas in the oven 1 passes through the heating space 115, the baking space 114, and the guide space 15 in sequence and then circulates back to the air inlet 113.

[0025] The heating unit 3 is arranged in the oven 1. Specifically, the heating unit 3 includes a plurality of electric heating rods 31 and a heater 32. The electric heating rods 31 are arranged in the guide space 15. Specifically, in this embodiment, three electric heating rods 31 are arranged in each guide space 15, and the electric heating rods 31 are fixed to the outer box 13. When the gas passes through the guide space 15, the gas is heated by the electric heating rods 31, so that when the gas circulates into the baking space 114, it can bake the items to be baked placed in the baking space 114 (not shown). In a variant implementation, when there is only one outer shell 12 and it surrounds the outer side of the inner shell 11, and defines a guide space 15 surrounding the outer side of the inner shell 11 together with the inner shell 11, the electric heating rod 31 is arranged in the guide space 15. The heater 32 is arranged in the heating space 115. In this embodiment, the heater 32 includes a plurality of heating rods arranged in an array and adjacent to the wind wheel 23. The heating rods are used to heat the gas in the oven 1, so that the gas passes through the air inlet 113 from the flow guide space 15 and is reheated before entering the baking space 114, thereby raising the gas to a predetermined temperature more quickly. In addition, the heating rods are arranged in an array, which also helps to evenly heat the gas. In a variant implementation, the arrangement of the heating rods is not limited to an array arrangement.

[0026] The air collecting ring 4 is a ring body with a gradually decreasing radius and is disposed at the air inlet 113, and is used to guide the air in the oven 1 to enter the heating space 115 through the air inlet 113. The air regulating plate 5 is disposed between the wind wheel 23 and the baking space 114, and has a plurality of air regulating holes arranged in an array. The air regulating holes are used to evenly blow the air generated by the wind wheel 23 to the baking space 114, so that the items to be baked in the baking space 114 can be evenly baked.

[0027] The path of gas diversion is described below. When the fan unit 2 is started, the gas is driven by the wind wheel 23 and enters the heating space 115 through the air inlet 113. After being heated by the heating rod, the gas enters the baking space 114 through the air regulating hole, and then enters the diversion space 15 through the air guide hole of the return air plate 111. After being heated by the electric heating rod 31, the gas returns to the air inlet 113, and the cycle is continuously repeated to quickly heat up and bake the items to be baked. It should be particularly noted that when the gas passes through the diversion space 15, since the outer side of the diversion space 15 is surrounded by the thermal insulation layer 16, the heat energy of the gas is less likely to be lost due to heat conduction, thereby being able to heat the gas in the oven 1 to the required temperature more quickly.

[0028] See also Figure 3A second embodiment of the circulating baking device 100 of the present invention is substantially the same as the first embodiment, with the difference that a filter layer 6 is disposed between the wind wheel 23 and the air regulating plate 5 in the second embodiment, and the filter layer 6 is specifically a HEPA filter, which is used to prevent the dust generated when the wind wheel 23 is running from being blown into the baking space 114 and affecting the cleanliness of the baking space 114.

[0029] In summary, the circulating baking device 100 of the present invention arranges a plurality of electric heating rods 31 in the flow guide space 15 so that when the gas circulates from the flow guide space 15 back to the baking space 114, the gas is continuously heated by the electric heating rods 31, and by defining a thermal insulation layer 16 together between the outer shell 12 and the outer box body 13, the heat energy in the gas is reduced from being lost from the outer shell 12 and the outer box body 13 through heat conduction, thereby improving the overall operating efficiency, so that the purpose of the present invention can be achieved.

[0030] However, what is described above is only an embodiment of the present invention and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A circulating baking device, characterized in that: The circulating baking device comprises: An oven, comprising an inner shell, at least one outer shell surrounding the outer shell, and an outer box surrounding the outer shell, wherein the inner shell defines a baking space, the inner shell and the outer shell jointly define at least one flow guiding space surrounding the outer shell, the outer shell and the outer box jointly define a heat insulation layer, and the baking space and the flow guiding space are connected; A heating unit, disposed in the oven; and The fan unit is arranged at one end of the oven and is used to drive the gas to circulate in the baking space and the guide space, and the gas is heated when passing through the heating unit.

2. The circulating baking device according to claim 1, characterized in that: The thermal insulation layer is a thermal insulation space separated from the outer shell and the outer box.

3. The circulating baking device according to claim 1, characterized in that: The inner shell has a plurality of return air plates, which together define the baking space, and each return air plate has a plurality of air guide holes.

4. The circulating baking device according to claim 1, characterized in that: The heating unit comprises a plurality of electric heating rods arranged in a circle in the flow guiding space.

5. The circulating baking device according to claim 3, characterized in that: The inner shell also has a shell body connected to the return air plate. The circulating baking device includes a plurality of outer shells that are spaced apart from each other and surround the outer side of the inner shell. The outer shells, together with the return air plate and the shell body, respectively define a plurality of guide spaces surrounding the outer side of the inner shell. The heating unit includes a plurality of electric heating rods correspondingly arranged in the guide spaces.

6. The circulating baking device according to claim 1, characterized in that: The inner shell further defines a heating space communicating with the baking space, and the heating unit includes a heater disposed in the heating space.

7. The circulating baking device according to claim 1, characterized in that: The circulating baking device further comprises an air regulating plate arranged between the fan unit and the baking space.

8. The circulating baking device according to claim 7, characterized in that: The circulating baking device further comprises a filter layer arranged between the fan unit and the air regulating plate.

9. The circulating baking device according to claim 1, characterized in that: The inner shell has an air inlet connected to the baking space, and the circulating baking device further includes an air collecting ring arranged at the air inlet.

10. The circulating baking device according to claim 4 or 5, characterized in that: The electric heating rod is fixed to the outer box.

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