Vertical air path structure for tunnel type oven

Abstract

The utility model discloses a vertical type wind path structure for a tunnel type oven, which comprises a shell, a material channel is arranged on the shell, the front end and the rear end of the shell are communicated through the material channel, and a circulating fan and a punching plate are sequentially arranged above the material channel from top to bottom; an air inlet located in the bottom of the circulating fan and an air outlet located in the side face of the circulating fan are formed in the circulating fan. An air supply path and an air return path are arranged in the shell. The input end of the air supply path communicates with an air outlet of the circulating fan, and the output end of the air supply path communicates with the top of the material channel through the punched plate. The input end of the air return path communicates with the side face of the material channel, and the output end of the air return path communicates with an air inlet of the circulating fan. According to the vertical type air path structure for the tunnel type oven, smooth circulation of an air path is guaranteed, and meanwhile the service life of the conveying net is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of tunnel type oven, especially vertical air path structure for tunnel type oven. BACKGROUND

[0002] The conventional tunnel type oven is provided with vertical air path structure, the air supply opening is located above the conveying net, and the air suction structure is arranged on the lower side of the conveying net, the conveying net for conveying the PCB is supported by the supporting roller, the suction force generated by the air suction increases the friction force between the conveying net and the supporting roller, increases the loss of the conveying net, and shortens the service life of the conveying net. In addition, in order to ensure the air path loop, the conveying net used must have mesh holes to ensure air circulation, which can easily cause the generation of screen printing when baking the PCB. If the Teflon conveying net without mesh holes (for example, the Teflon net of 0*0 specification, that is, the Teflon net belt with mesh hole size performance) is used, although the Teflon conveying net can effectively prevent the PCB from leaving screen printing during baking, due to the mesh hole-free characteristic, the air path loop of the vertical air supply is blocked, and the friction force of the conveying net is increased, thereby reducing the service life of the conveying net. SUMMARY

[0003] The utility model aims at providing vertical air path structure for tunnel type oven, which ensures smooth circulation of the air path and is beneficial to prolonging the service life of the conveying net.

[0004] To achieve the above-mentioned purpose, the utility model provides vertical air path structure for tunnel type oven, which comprises a shell, the shell is provided with a material channel penetrating through the front and rear ends thereof, the upper side of the material channel is provided with a circulating fan and a punched plate arranged in sequence from top to bottom; the circulating fan is provided with an air inlet located at the bottom thereof and an air outlet located at the side thereof, the shell is provided with a supply air path and a return air path; the input end of the supply air path is communicated with the air outlet of the circulating fan, the output end of the supply air path is communicated with the top of the material channel through the punched plate; the input end of the return air path is communicated with the side of the material channel, and the output end of the return air path is communicated with the air inlet of the circulating fan.

[0005] As a further improvement of the utility model, the shell comprises an outer shell and an inner shell, the inner shell is located on the inner side of the outer shell, and the material channel penetrates through the outer shell and the inner shell; the upper side of the punched plate is provided with a return air shell, and the return air shell is provided with a return air cavity; the left outer side wall of the inner shell and the left inner side wall of the outer shell, and the right outer side wall of the inner shell and the right inner side wall of the outer shell are all arranged at intervals and form first return air sections, the left and right side walls of the inner shell are provided with air adjusting plates, the material channel is communicated with the lower end of the first return air sections through the air adjusting plates, and the upper ends of the left and right first return air sections are respectively communicated with the left and right ends of the return air cavity of the return air shell; the air inlet of the circulating fan is communicated with the top of the return air cavity, and the first return air sections and the return air cavity jointly constitute the return air path.

[0006] As a further improvement of the utility model, the circulating fan includes a linkage impeller and motor, the impeller is located above the air inlet, the air outlet of the circulating fan is located on the circumferential side of the impeller, the number of air outlets is two and is located on the top surface of the return air shell, the left and right sides of each air outlet is equipped with a first air baffle, the first air baffle, the outer top surface of the return air shell, the inner top surface of the shell form a first air supply section; the front outer side wall of the return air shell and the front inner side wall of the shell, the rear outer side wall of the return air shell (6) and the rear inner side wall of the shell are arranged at intervals and form a second air supply section, the outer bottom surface of the return air shell and the upper surface of the punched plate form a third air supply section, the first air supply section, the second air supply section and the third air supply section are sequentially communicated and form the air supply air path.

[0007] As a further improvement of the utility model, the outer bottom surface of the return air shell is connected with an arc-shaped air distribution baffle in the middle.

[0008] As a further improvement of the utility model, the return air shell is provided with a second air baffle between the first return air section and the return air cavity.

[0009] As a further improvement of the utility model, the shell is provided with a third air baffle between the first air supply section and the second air supply section, and a fourth air baffle between the second air supply section and the third air supply section.

[0010] As a further improvement of the utility model, the shell is provided with an air inlet on one side of the air regulating plate; the return air shell is provided with an exhaust pipe, one end of the exhaust pipe is communicated with the return air cavity, and the other end extends out of the shell.

[0011] As a further improvement of the utility model, the shell is provided with an electric heating group mounting portion on one side of the air supply air path.

[0012] Beneficial effects

[0013] Compared with the prior art, the vertical air path structure for the tunnel oven has the following advantages:

[0014] 1. The circulating hot air in the oven passes out from the side of the material channel when returning, so that the circulating fan does not form a large pressure on the conveying net in the material channel when pumping air, thereby reducing the abrasion of the conveying net and prolonging the service life of the conveying net.

[0015] 2. The punched net makes the air distribution more uniform when supplying air, avoids the problem of local high temperature when conveying hot air, and ensures the uniformity of the oven.

[0016] 3. There are two air supply and return air paths, making airflow smoother during both. Combined with the air guide vanes, this reduces wind noise and minimizes energy loss.

[0017] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional diagram of the vertical airflow structure for a tunnel oven;

[0020] Figure 2 A top view of the vertical airflow structure for a tunnel oven;

[0021] Figure 3 One of the perspective views of the vertical airflow structure for a tunnel oven, excluding the outer shell;

[0022] Figure 4 The second perspective view of the vertical airflow structure for a tunnel oven, excluding the outer shell;

[0023] Figure 5 for Figure 2 AA view;

[0024] Figure 6 for Figure 2 BB view;

[0025] Figure 7 This is a side view of the air distribution baffle and return air casing;

[0026] Figure 8 A three-dimensional view of the internal structure of a vertical airflow system for a tunnel oven;

[0027] Figure 9 An internal perspective view of the vertical airflow structure for a tunnel oven. Detailed Implementation

[0028] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0029] Example

[0030] The specific embodiments of this utility model are as follows: Figures 1 to 9As shown, a vertical air path structure for a tunnel oven includes a housing, the housing is provided with a material passage 2 penetrating through the front and rear ends of the housing, the upper part of the material passage 2 is provided with a circulating fan and a punched plate 4 arranged from top to bottom, the punched plate 4 is parallel to the conveying net 9, and the punched plate 4 is provided with a plurality of air vents. The circulating fan is provided with an air inlet 61 at the bottom and an air outlet 62 at the side, and the housing is provided with a supply air path and a return air path. The input end of the supply air path is communicated with the air outlet 62 of the circulating fan, and the output end of the supply air path is communicated with the top of the material passage 2 through the punched plate 4. The input end of the return air path is communicated with the side of the material passage 2, and the output end of the return air path is communicated with the air inlet 61 of the circulating fan.

[0031] The housing is provided with an electric heating group mounting portion 8 on one side of the supply air path for mounting an electric heating group structure (not shown in the figure), and in this embodiment, the electric heating group mounting portion 8 is located above the first supply air section 91. The electric heating group structure heats the passing air by electrification, and the heated air bakes the PCB board on the conveying net 9. The conveying net 9 adopts a Teflon conveying net without mesh, and at least two supporting rollers 21 are connected in the housing, which are used to support the conveying net 9, and the conveying net 9 passes through the material passage 2.

[0032] In this embodiment, the housing includes an outer shell 1 and an inner shell 7, the inner shell 7 is located inside the outer shell 1 and is fixedly connected with the outer shell 1, and the material passage 2 is horizontally arranged and penetrates through the outer shell 1 and the inner shell 7. The upper part of the punched plate 4 is provided with a square return air housing 6, and the return air housing 6 is provided with a return air cavity 60. The left and right ends of the return air housing 6 are fixedly connected with the inner shell 7, and the punched plate 4 is also fixedly connected with the inner shell 7. The left outer side wall of the inner shell 7 and the left inner side wall of the outer shell 1 are arranged at intervals and form a first return air section 10, the left and right side walls of the inner shell 7 are provided with air adjusting plates 5, the left and right sides of the material passage 2 are communicated with the lower ends of the first return air sections 10 on the left and right sides through the air adjusting plates 5, and the upper ends of the first return air sections 10 on the left and right sides are communicated with the left and right ends of the return air cavity 60 of the return air housing 6. The air inlet 61 of the circulating fan is communicated with the top of the return air cavity 60, and the first return air section 10 and the return air cavity 60 jointly constitute a return air path.

[0033] The circulating fan comprises a linkage impeller 30 and a motor 3, the motor 3 is installed on the shell 1, and the rotating shaft of the impeller 30 is vertically arranged. The impeller 30 is located above the air inlet 61, and the air outlet 62 of the circulating fan is located on the circumferential side of the impeller 30, the number of the air outlet 62 is two, and the air outlet 62 is located on the top surface of the return air shell 6 on the front and rear sides, and the first air deflector 63 is arranged on the left and right sides of each air outlet 62, and the included angle between the left and right first air deflectors 63 is obtuse, and the circulating air is diffused through the action of the first air deflectors 63 on the left and right sides when the circulating air is sprayed from the air outlet 62, and the distribution is more uniform. The first air deflector 63, the outer top surface of the return air shell 6 and the inner top surface of the shell form a first air supply section 91. The front outer side wall of the return air shell 6 and the front inner side wall of the shell 1 are spaced apart and form a second air supply section 92, and the outer bottom surface of the return air shell 6 and the upper surface of the punched plate 4 form a third air supply section 93, and the first air supply section 91, the second air supply section 92 and the third air supply section 93 are sequentially communicated and form an air supply air path.

[0034] The outer bottom surface of the return air shell 6 is connected with an arc-shaped air distribution baffle 65, the air distribution baffle 65 separates the left and right air supply air paths, and the air distribution baffle 65 is symmetrically arranged and has an arc surface with an included angle of 90 degrees.

[0035] The return air shell 6 is provided with a second air deflector 71 located between the first return air section 10 and the return air cavity 60. The shell is provided with a third air deflector 72 located between the first air supply section 91 and the second air supply section 92, and a fourth air deflector 73 located between the second air supply section 92 and the third air supply section 93. The second air deflector 71, the third air deflector 72 and the fourth air deflector 73 are all arc-shaped and have an arc surface with an included angle of 90 degrees, and each air deflector plays a guiding role when the circulating air needs to flow in a direction.

[0036] The air regulating plate 5 is provided with a plurality of air vents, each air vent is provided with a shielding plate, and the air volume of the air regulating plate 5 can be adjusted by adjusting the opening degree of the shielding plate.

[0037] The shell 1 is provided with an air inlet 11 located on one side of the air regulating plate 5, so that fresh air from the outside can enter the air supply air path. The return air shell 6 is provided with an exhaust pipe 64, one end of the exhaust pipe 64 is communicated with the return air cavity 60, and the other end of the exhaust pipe 64 extends out of the shell. The exhaust pipe 64 ensures that the pressure in the return air path is maintained within a proper range through exhaust.

[0038] The PCB carried on the conveying net 9 enters the material passage 2 with the conveying net 9, hot air is sprayed from the punching plate 4 and blown on the PCB, the PCB is baked, then the hot air enters the first return air section 10 from the air adjusting plate 5 on the left and right sides of the material passage 2, enters the return air cavity 60 upwards, and enters the circulating fan from the air inlet 61. The circulating air is accelerated by the impeller 30 of the circulating fan, sprayed from the air outlet 62 and enters the first air supply section 91, heated again by the electric heating group, sprayed again from the punching plate 4 through the second air supply section 92 and the third air supply section 93, and the circulation of the hot air is realized.

[0039] The utility model has been described above in combination with the best embodiment, but the utility model is not limited to the above disclosed embodiments, and should cover various modifications, equivalent combinations according to the essence of the utility model.

Claims

1. A vertical air path structure for a tunnel type oven comprising a housing, characterized by, The shell is provided with a material channel (2) penetrating through the front and rear ends thereof, and an upper portion of the material channel (2) is provided with a circulating fan and a punching plate (4) arranged in sequence from top to bottom; the circulating fan is provided with an air inlet (61) located at a bottom portion thereof and an air outlet (62) located at a side surface thereof, and the shell is provided with a supply air wind path and a return air wind path; an input end of the supply air wind path is communicated with the air outlet (62) of the circulating fan, an output end of the supply air wind path is communicated with a top portion of the material channel (2) through the punching plate (4), and an input end of the return air wind path is communicated with a side surface of the material channel (2), and an output end of the return air wind path is communicated with the air inlet (61) of the circulating fan.

2. The vertical air flow structure for a tunnel type oven according to claim 1, wherein The shell comprises an outer shell (1) and an inner shell (7), the inner shell (7) is located at an inner side of the outer shell (1), and the material channel (2) penetrates through the outer shell (1) and the inner shell (7) simultaneously; an upper portion of the punching plate (4) is provided with a return air shell (6), the return air shell (6) is provided with a return air cavity (60) therein; first return air sections (10) are arranged at intervals between a left outer side wall of the inner shell (7) and a left inner side wall of the outer shell (1) and between a right outer side wall of the inner shell (7) and a right inner side wall of the outer shell (1), air adjusting plates (5) are arranged on the left and right side walls of the inner shell (7), the material channel (2) is communicated with lower ends of the first return air sections (10) through the air adjusting plates (5), upper ends of the left and right first return air sections (10) are communicated with left and right ends of the return air cavity (60) of the return air shell (6) respectively, and the air inlet (61) of the circulating fan is communicated with a top portion of the return air cavity (60), the first return air sections (10) and the return air cavity (60) jointly constitute the return air wind path.

3. The vertical air flow structure for a tunnel type oven according to claim 2, wherein The circulating fan comprises a linkage of an impeller (30) and a motor (3), the impeller (30) is located above the air inlet (61), the air outlet (62) of the circulating fan is located at a circumferential side of the impeller (30), the number of the air outlets (62) is two, and the air outlets (62) are located above top surfaces of the front and rear sides of the return air shell (6), first air guide plates (63) are arranged on left and right sides of each air outlet (62), the first air guide plates (63), an outer top surface of the return air shell (6) and an inner top surface of the shell constitute a first supply air section (91), second supply air sections (92) are arranged at intervals between a front outer side wall of the return air shell (6) and a front inner side wall of the shell and between a rear outer side wall of the return air shell (6) and a rear inner side wall of the shell, a third supply air section (93) is formed between an outer bottom surface of the return air shell (6) and an upper surface of the punching plate (4), the first supply air section (91), the second supply air sections (92) and the third supply air section (93) are communicated in sequence and constitute the supply air wind path.

4. The vertical air flow structure for a tunnel type oven according to claim 3, wherein A curved air distribution partition plate (65) is connected to a middle portion of the outer bottom surface of the return air shell (6), and the air distribution partition plate (65) separates the left and right supply air wind paths.

5. The vertical air flow structure for a tunnel type oven according to claim 2, wherein The return air shell (6) is provided with second air guide plates (71) located between the first return air sections (10) and the return air cavity (60).

6. The vertical air flow structure for a tunnel type oven according to claim 3, wherein The shell is internally provided with a third air deflector (72) between the first air supply section (91) and the second air supply section (92), and is further provided with a fourth air deflector (73) between the second air supply section (92) and the third air supply section (93).

7. The vertical air flow structure for a tunnel type oven according to claim 2, wherein The shell (1) is provided with an air inlet (11) on one side of the air register (5); the return air shell (6) is provided with an exhaust pipe (64), one end of which communicates with the return air cavity (60), and the other end extends out of the shell.

8. The vertical air flow structure for a tunnel type oven according to claim 1, wherein The shell is provided with an electric heating group mounting portion (8) on one side of the air supply air path.

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