PCB tunnel drying oven and exhaust switching device thereof
By designing the exhaust air adapter device, the problem of liquid oil reflux pollution in the PCB board tunnel oven is solved, a clean and efficient drying process is achieved, and maintenance costs are reduced.
Patent Information
- Application Number
- CN202421825408.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-31
AI Technical Summary
During the drying process of existing PCB board tunnel ovens, the liquid oil condensed on the inner wall of the aluminum foil tube is prone to reflow and contaminate the PCB board, and the cost of cleaning and replacing the aluminum foil tube is high.
An exhaust air adapter device is designed, including a transfer box and an oil junction box, which is connected to an aluminum foil tube through an exhaust pipe. The oil outlet covers the lower port of the exhaust pipe, and liquid oil drips into the oil junction box to prevent backflow into the PCB board tunnel oven.
Effectively prevent liquid oil from returning to contaminating PCB boards, reducing the frequency and cost of cleaning and replacing aluminum foil tubes.
Smart Images
Figure CN223142235U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of PCB board drying equipment, in particular to a PCB board tunnel oven and its exhaust air transfer device. Background Art
[0002] The PCB board tunnel oven plays a crucial role in modern electronic manufacturing, and is widely used in the low-temperature pre-baking, segmented drying, curing and other processes after the solder mask printing of the PCB board. The principle of the PCB board tunnel oven is roughly as follows: Let the conveying device drive the PCB board to move along the length direction of the PCB board tunnel oven, and send hot air into the PCB board tunnel oven, then the drying of the PCB board can be realized.
[0003] A plurality of exhaust air interfaces are arranged along the length direction at the top of the PCB board tunnel oven. The prior art generally directly connects the exhaust air interfaces with the main exhaust pipe through aluminum foil pipes, and the main exhaust pipe is adapted with an exhaust pump or an exhaust fan to extract the oil fume and waste gas generated during the drying process from the PCB board tunnel oven. During use, the oil fume will re-condense into liquid oil on the inner wall of the aluminum foil pipe; and the farther away from the exhaust air interface, the lower the temperature, and the more serious the condensation of the oil fume; after a long time, the liquid oil condensed on the inner wall of the aluminum foil pipe will flow back and drip into the PCB board tunnel oven, which is very easy to contaminate the PCB board. And it is very troublesome to disassemble, install and clean the aluminum foil pipe; replacing the new aluminum foil pipe will increase the production cost. Summary of the Invention
[0004] The purpose of the utility model is to provide an exhaust air transfer device, which is used to connect the exhaust air interface of the PCB board tunnel oven with the aluminum foil pipe, and can prevent the liquid oil flowing back along the inner wall of the aluminum foil pipe from dripping into the PCB board tunnel oven. Based on the same inventive concept, another purpose of the utility model is to provide a PCB board tunnel oven with the aforementioned exhaust air transfer device.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is:
[0006] The exhaust air transfer device includes: a transfer box; the transfer box includes: an exhaust cavity on the left and an intake cavity on the right; a exhaust pipe is arranged at the top of the exhaust cavity to form a connection with the aluminum foil pipe; an oil drain port is arranged at the bottom of the exhaust cavity, and an oil receiving box is detachably installed; the projection of the lower port of the exhaust pipe on the horizontal plane completely falls within the coverage range of the oil drain port; an intake pipe is arranged at the bottom of the intake cavity to form a connection with the exhaust air interface of the PCB board tunnel oven.
[0007] Optionally, the upper end surface of the intake pipe is higher than the upper surface of the bottom plate of the intake cavity; there is a gap between the outer wall of the part of the intake pipe located in the intake cavity and the inner side wall of the intake cavity.
[0008] Optionally, the oil drain port completely covers the bottom of the exhaust chamber; the bottom plate of the intake chamber is higher than the oil drain port of the exhaust chamber to guide the liquid oil to flow towards the oil drain port.
[0009] Optionally, the top plate of the intake chamber is inclined to guide the condensed liquid oil to flow towards the inner side wall of the intake chamber.
[0010] Optionally, the oil receiving box is connected to the exhaust chamber by a buckle.
[0011] Optionally, one of the intake pipe and the exhaust pipe is provided with a butterfly valve.
[0012] Optionally, the intake chamber is installed with a bracket to support it on the top of the PCB board tunnel oven.
[0013] Optionally, the bracket includes: a connecting member and a supporting member; the connecting member includes: a first earpiece, a second earpiece, and a connecting portion connecting the first earpiece and the second earpiece; the supporting member includes: a third earpiece extending in the horizontal direction and a vertical plate portion extending upward from the third earpiece; the first earpiece, the second earpiece, and the third earpiece are respectively provided with connecting holes; the vertical plate portion is provided with a strip-shaped hole extending in the up and down direction.
[0014] This application also provides a PCB board tunnel oven, which has the aforementioned exhaust air transfer device.
[0015] The working principle of the present utility model is as follows: Connect the lower end of the intake pipe to the exhaust air interface of the PCB board tunnel oven, connect the upper end of the exhaust pipe to the aluminum foil pipe, and connect the aluminum foil pipe to the main exhaust pipe, then the oil fume and waste gas generated during the drying process can be extracted from the PCB board tunnel oven. When the liquid oil condensed on the inner wall of the aluminum foil pipe flows back, since the projection of the lower port of the exhaust pipe on the horizontal plane completely falls within the coverage range of the oil drain port; therefore, the liquid oil flowing back along the inner wall of the aluminum foil pipe will finally drip into the oil receiving box installed at the oil drain port. Regularly remove the oil receiving box to clean the liquid oil in the oil receiving box.
[0016] It can be seen from this that the beneficial effect of the present utility model is that it can prevent the liquid oil flowing back along the inner wall of the aluminum foil pipe from dripping into the PCB board tunnel oven, thereby effectively avoiding the pollution of the PCB board during the drying process. Description of the Drawings
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0018] Figure 1 It is a schematic structural diagram of an exhaust air transfer device;
[0019] Figure 2 It is a schematic diagram of arranging an oil drain port in an exhaust cavity;
[0020] Figure 3 For Figure 2 A schematic diagram from another angle;
[0021] Figure 4 It is a schematic diagram of installing the exhaust air transfer device on a PCB board tunnel oven.
[0022] Reference numerals: 1, transfer box; 2, exhaust cavity; 3, intake cavity; 4, exhaust pipe; 5, oil drain port; 6, oil receiving box; 7, intake pipe; 8, locking buckle; 9, butterfly valve; 10, bracket; 11, connecting member; 12, supporting member; 13, first lug; 14, second lug; 15, connecting portion; 16, third lug; 17, vertical plate portion; 18, strip hole. Specific embodiments
[0023] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary in nature rather than restrictive.
[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the attached Figure 1 drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.
[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.
[0026] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0027] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model.
[0028] The following combines the attached Figure 1 ~attached Figure 4 to detail the embodiments of the present utility model.
[0029] The embodiment of the present utility model provides an exhaust air transfer device. The exhaust air transfer device includes: a transfer box 1. The transfer box 1 includes: an exhaust cavity 2 on the left and an intake cavity 3 on the right. A exhaust pipe 4 is provided at the top of the exhaust cavity 2 for connection with an aluminum foil pipe. It should be understood that the exhaust pipe 4 and the aluminum foil pipe can be connected by means such as a hoop, a flexible sleeve, etc. A drain port 5 is provided at the bottom of the exhaust cavity 2, and an oil receiving box 6 is detachably installed. The projection of the lower port of the exhaust pipe 4 on the horizontal plane completely falls within the coverage range of the drain port 5. An intake pipe 7 is provided at the bottom of the intake cavity 3 for connection with the exhaust air interface of a PCB board tunnel oven. It should be understood that the intake pipe 7 and the exhaust air interface of the PCB board tunnel oven can be connected by means such as a hoop, a flexible sleeve, etc.; in addition, the inner diameter of the intake pipe 7 can be made to match the outer diameter of the exhaust air interface, so that the intake pipe 7 can be directly sleeved on the exhaust air interface.
[0030] The following elaborates on the specific implementation manner of the present utility model: Connect the lower end of the intake pipe 7 to the exhaust air interface of the PCB board tunnel oven, connect the upper end of the exhaust pipe 4 to the aluminum foil pipe, and connect the aluminum foil pipe to the main exhaust pipe, then the oil fume and waste gas generated during the drying process can be extracted from the PCB board tunnel oven. When the liquid oil condensed on the inner wall of the aluminum foil pipe flows back, since the projection of the lower port of the exhaust pipe 4 on the horizontal plane completely falls within the coverage range of the drain port 5; therefore, the liquid oil flowing back along the inner wall of the aluminum foil pipe will finally drip into the oil receiving box 6 installed at the drain port 5. Regularly remove the oil receiving box 6, and the liquid oil in the oil receiving box 6 can be cleaned. The present utility model can prevent the liquid oil flowing back along the inner wall of the aluminum foil pipe from dripping into the PCB board tunnel oven, thereby effectively avoiding the pollution of the PCB board during the drying process.
[0031] Furthermore, the upper end surface of the intake pipe 7 is higher than the upper surface of the bottom plate of the intake chamber 3; there is a gap between the outer wall of the part of the intake pipe 7 located inside the intake chamber 3 and the inner wall of the intake chamber 3. It should be understood that the outer wall of the intake chamber 3 is in contact with the outside air, and it is inevitable that a small amount of oil fume will condense on the inner wall of the intake chamber 3; over time, liquid oil may also flow back on the inner wall of the intake chamber 3. By making the upper end surface of the intake pipe 7 higher than the upper surface of the bottom plate of the intake chamber 3; and by making there be a gap between the outer wall of the part of the intake pipe 7 located inside the intake chamber 3 and the inner wall of the intake chamber 3; in this way, the liquid oil flowing back along the inner wall of the intake chamber 3 can be effectively prevented from dropping onto the PCB board in the tunnel oven.
[0032] Furthermore, the oil drain port 5 completely covers the bottom of the exhaust chamber 2; the bottom plate of the intake chamber 3 is higher than the oil drain port 5 of the exhaust chamber 2 to guide the liquid oil to flow towards the oil drain port 5. It should be understood that the bottom plate of the intake chamber 3 being higher than the oil drain port 5 of the exhaust chamber 2 can effectively guide the liquid oil accumulated on the bottom plate of the intake chamber 3 to flow towards the oil drain port 5.
[0033] Furthermore, the top plate of the intake chamber 3 is inclined to guide the condensed liquid oil to flow towards the inner wall of the intake chamber 3. It should be understood that this can prevent the liquid oil condensed on the top plate of the intake chamber 3 from dropping into the intake pipe 7.
[0034] Furthermore, the oil receiving box 6 is connected to the exhaust chamber 2 by a buckle 8.
[0035] Furthermore, one of the intake pipe 7 and the exhaust pipe 4 is provided with a butterfly valve 9. It should be understood that the flow rate of the suction air flow can be controlled by the butterfly valve 9.
[0036] Furthermore, the intake chamber 3 is installed with a bracket 10 to support it on the top of the PCB board tunnel oven.
[0037] Further, the bracket 10 includes: a connecting member 11 and a supporting member 12; the connecting member 11 includes: a first lug 13, a second lug 14, and a connecting portion 15 connecting the first lug 13 and the second lug 14; the supporting member 12 includes: a third lug 16 extending in the horizontal direction and a vertical plate portion 17 extending upward from the third lug 16; the first lug 13, the second lug 14, and the third lug 16 are respectively provided with connecting holes; the vertical plate portion 17 is provided with a strip-shaped hole 18 extending in the up-and-down direction. It should be understood that by attaching the first lug 13 to the outer wall of the intake cavity 3 and screwing a bolt into the connecting hole of the first lug 13, the connecting member 11 can be installed on the intake cavity 3. By attaching the third lug 16 to the top of the PCB board tunnel oven and screwing a bolt into the connecting hole of the third lug 16, the supporting member 12 can be installed on the top of the PCB board tunnel oven. By aligning the connecting hole of the second lug 14 with the strip-shaped hole 18 and screwing on a bolt, the connection between the connecting member 11 and the supporting member 12 can be completed. The provision of the strip-shaped hole 18 extending in the up-and-down direction in the vertical plate portion 17 facilitates the adjustment of the height of the docking oil box 6, and further facilitates the connection or disconnection of the exhaust air transfer device with the exhaust air interfaces of the aluminum foil tube and the PCB board tunnel oven.
[0038] An embodiment of the present invention further provides a PCB board tunnel oven, which has the aforementioned exhaust air transfer device.
[0039] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that without departing from the principles and essence of the present invention, various changes or modifications can be made to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. Exhaust air transfer device, characterized in that: It includes: A transfer box (1); The transfer box (1) includes: an exhaust chamber (2) on the left and an intake chamber (3) on the right; The top of the exhaust chamber (2) is provided with an exhaust pipe (4) for connection with an aluminum foil pipe; The bottom of the exhaust chamber (2) is provided with an oil drain port (5), and an oil receiving box (6) is detachably installed; The projection of the lower port of the exhaust pipe (4) on the horizontal plane completely falls within the coverage of the oil drain port (5); The bottom of the intake chamber (3) is provided with an intake pipe (7) for connection with the exhaust interface of the PCB board tunnel oven.
2. The exhaust air transfer device according to claim 1, characterized in that: The upper end surface of the intake pipe (7) is higher than the upper surface of the bottom plate of the intake chamber (3); There is a gap between the outer wall of the part of the intake pipe (7) located in the intake chamber (3) and the inner wall of the intake chamber (3).
3. The exhaust air transfer device according to claim 1, characterized in that: The oil drain port (5) completely covers the bottom of the exhaust chamber (2); The bottom plate of the intake chamber (3) is higher than the oil drain port (5) of the exhaust chamber (2) to guide the liquid oil to flow towards the oil drain port (5).
4. The exhaust air transfer device according to any one of claims 1 to 3, characterized in that: The top plate of the intake chamber (3) is inclined to guide the condensed liquid oil to flow towards the inner wall of the intake chamber (3).
5. The exhaust air transfer device according to any one of claims 1 to 3, characterized in that: The oil receiving box (6) is connected to the exhaust chamber (2) through a buckle (8).
6. The exhaust air transfer device according to any one of claims 1 to 3, characterized in that: One of the intake pipe (7) and the exhaust pipe (4) is provided with a butterfly valve (9).
7. The exhaust air transfer device according to any one of claims 1 to 3, characterized in that: The intake chamber (3) is installed with a bracket (10) to support it on the top of the PCB board tunnel oven.
8. The exhaust air transfer device according to claim 7, characterized in that: The bracket (10) includes: a connecting member (11) and a supporting member (12); The connecting member (11) includes: a first ear piece (13), a second ear piece (14), and a connecting portion (15) connecting the first ear piece (13) and the second ear piece (14); The supporting member (12) includes: a third ear piece (16) extending in the horizontal direction and a vertical plate portion (17) extending upward from the third ear piece (16); The first ear piece (13), the second ear piece (14), and the third ear piece (16) are respectively provided with connecting holes; The vertical plate portion (17) is provided with a strip hole (18) extending in the up and down direction.
9. PCB board tunnel oven, characterized in that: It has the exhaust air transfer device according to any one of claims 1 to 8.