Heating structure in reflow soldering closed working cavity
By setting up a multi-gradient temperature heating structure in the sealed working chamber of the vacuum reflow oven, the problem of unstable temperature during the conveying process of conventional reflow ovens is solved, which improves welding efficiency and temperature uniformity and reduces costs.
Patent Information
- Application Number
- CN202422895511.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Conventional vacuum reflux furnaces require the chamber to be opened during the conveying process, which affects temperature stability and is costly, and cannot achieve precise adjustment of multiple temperature gradients.
A multi-gradient temperature heating structure is set up in the sealed working chamber, including heat source components, heat exchange plates and support rods, using graphite plates and ceramic plates to provide a multi-gradient temperature environment, ensuring that the welded parts do not need to move between multiple chambers.
It achieves multi-gradient temperature regulation within a sealed working chamber, improving welding efficiency and temperature uniformity while reducing costs.
Smart Images
Figure CN223544286U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vacuum reflow welding furnace technology, and in particular to a heating structure for a closed working chamber in reflow welding. Background Technology
[0002] A conventional vacuum reflow oven has multiple heating and cooling stations. Its working principle is as follows: the workpiece to be welded is input into the reflow oven from one side, heated to the expected temperature at one of the heating stations in the reflow oven, and then conveyed to the next heating station until the heating and welding are completed; it continues to be conveyed to the next station, at which point it has entered the cooling station. Multiple cooling stations can be set up, and the temperature decreases sequentially.
[0003] This conventional reflow oven structure has the following drawbacks:
[0004] 1. During the transport process, the chamber needs to be opened, which can easily affect the internal temperature.
[0005] 2. Due to structural limitations, welding a set of workpieces requires multiple heating systems, resulting in higher costs. Utility Model Content
[0006] In response to the shortcomings of the existing production technology, the applicant provides a reasonably structured reflow soldering closed working chamber heating structure that can adjust multiple temperature gradients within a single working chamber, eliminating the need for the workpiece to be soldered to move between multiple working chambers and thus ensuring the accuracy of each processing temperature gradient.
[0007] The technical solution adopted in this utility model is as follows:
[0008] A heating structure for a closed working chamber in reflow soldering provides a multi-gradient temperature environment while maintaining a sealed state throughout the cooling process of a batch of parts to be welded.
[0009] The heating structure includes:
[0010] The heat source assembly is built into the working chamber.
[0011] A heat exchange plate covers the heat source assembly; the workpiece to be welded is placed on the heat exchange plate.
[0012] The support rod is fixedly installed in the working chamber to support the heat source assembly and heat exchange plate.
[0013] The distance between the heat source component and the bottom wall of the working chamber is set.
[0014] As a further improvement to the above technical solution:
[0015] The heat source component includes:
[0016] The heat source plate is electrically connected to the outside environment and serves as an electric heating plate.
[0017] An insulating support plate rests beneath the heat source plate.
[0018] An insulating cover is placed over the heat source plate.
[0019] The insulating tray and insulating cover are fastened together to form a space for accommodating the heat source plate.
[0020] The fastening points between the insulating tray and the insulating cover are evenly distributed throughout the entire heat source assembly.
[0021] The thickness of the insulating tray is greater than the thickness of the insulating cover plate.
[0022] Multiple heat source components are installed in each working chamber, with gaps between adjacent heat source components, and support rods are embedded in these gaps.
[0023] The heat source plate is made of graphite.
[0024] The heat source plate has a serpentine heating structure with reserved space for the fastening points to pass through.
[0025] The insulating tray and insulating cover are made of ceramic plate.
[0026] The insulating tray has a flange, and the opening at the flange forms a conductive through hole.
[0027] The beneficial effects of this utility model are as follows:
[0028] This utility model has a compact and reasonable structure and is easy to operate. It can provide corresponding stepped heating temperatures for the parts to be welded on the same tooling. The graphite surface heating inside each working chamber replaces the linear heating, which improves the heating rate and thus improves the welding efficiency.
[0029] In each working chamber, the hot plate is equipped with a support rod for support. Because the hot plate heats evenly and has a large heating area, the effective heating area is larger than that of conventional linear heating during operation. Furthermore, the edges of the heated surface will not be unheated or have low temperatures. The area of the hot plate is the effective area. Compared with linear heating, which is prone to local heat transfer and temperature differences, the three-stage electric heating of this invention has a higher temperature and more uniform heating. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the open structure of the working chamber of this utility model, and a heating structure is provided inside the working chamber.
[0031] Figure 2 This is a cross-sectional view of the working cavity and its internal heating structure of this utility model.
[0032] Figure 3 This is an exploded view of the heating structure of this utility model.
[0033] Figure 4 This is an exploded view of the heating structure of this utility model from another perspective.
[0034] Among them: 1. Heat source components; 2. Heat exchange plates;
[0035] 101. Support rod; 102. Heat source plate; 103. Insulating support plate; 104. Insulating cover plate; 105. Fastening point; 106. Flanged edge; 107. Conductive through hole. Detailed Implementation
[0036] The specific embodiments of this utility model are described below with reference to the accompanying drawings.
[0037] like Figures 1-4 As shown in the figure, the reflow soldering sealed working chamber heating structure of this embodiment ensures that the working chamber remains sealed throughout the welding and cooling process of a batch of parts to be welded, and the heating structure provides a multi-gradient temperature environment.
[0038] The heating structure includes:
[0039] Heat source component 1 is built into the working chamber.
[0040] Heat exchange plate 2 covers heat source assembly 1; the workpiece to be welded is placed on heat exchange plate 2.
[0041] Support rod 101 is fixedly installed in the working chamber to support heat source assembly 1 and heat exchange plate 2.
[0042] The distance between the heat source component 1 and the bottom wall of the working chamber is set.
[0043] Heat source component 1 includes:
[0044] Heat source plate 102 is electrically connected to the outside environment and is an electric heating plate.
[0045] The insulating support plate 103 is placed below the heat source plate 102.
[0046] Insulating cover 104 is affixed over the heat source plate 102.
[0047] The insulating tray 103 and the insulating cover 104 are fastened together to form a space for accommodating the heat source plate 102.
[0048] The fastening points 105 between the insulating support plate 103 and the insulating cover plate 104 are evenly distributed on the entire heat source assembly 1.
[0049] The thickness of the insulating support plate 103 is greater than the thickness of the insulating cover plate 104.
[0050] Multiple sets of heat source components 1 are installed in each working chamber, with gaps between adjacent heat source components 1, and support rods 101 are embedded in these gaps.
[0051] The heat source plate 102 is made of graphite.
[0052] The heating structure of the heat source plate 102 is serpentine, with reserved positions for the fastening point 105 to pass through.
[0053] The insulating tray 103 and the insulating cover 104 are made of ceramic plates.
[0054] The insulating tray 103 has a flange 106, and an opening at the flange 106 forms a conductive through hole 107.
[0055] The specific structure and heating principle of this utility model are as follows:
[0056] like Figure 1 As shown, the heating structure is built into the working chamber, in conjunction with the reference. Figure 2 and Figure 3 It can be seen that the heating structure includes a heat source component 1 and a heat exchange plate 2. A gap is reserved between the heat source component 1 and the bottom wall of the working chamber to prevent excessive heat from being conducted to the working chamber wall due to the close distance; the heat exchange plate 2 is placed on the heat source component 1, and the subsequent parts to be welded are placed on the heat exchange plate 2 for heating and welding.
[0057] Therefore, the position of the heat source assembly 1 needs to be fixed. In one embodiment of this application, a support rod 101 is provided inside the working chamber. The support rod 101 is fixedly connected to two opposing chamber walls, and the heat source assembly 1 is supported and limited by the support rod 101. If necessary, an additional support rod 101 or support block can be added below the heat source assembly 1 to strengthen the support effect.
[0058] like Figure 3 and Figure 4 As shown in the exploded view, the heat source plate 102 is a serpentine graphite plate. Insulating support plates 103 and insulating cover plates 104 are provided on the upper and lower sides of the heat source plate 102 to wrap around it. Conductive through holes 107 are opened at the flanges 106 of the insulating support plates 103. The ends of the serpentine heat source plate 102 extend out of the conductive through holes 107 and connect to external wires. After conducting electricity, it begins to generate heat.
[0059] In use, the fixture fully loaded with the parts to be welded is placed into the working chamber. After the chamber is closed, it is energized and heated. Multiple progressively increasing heating temperatures are provided over various time periods, according to process requirements. After welding is completed, the workpiece is cooled to the furnace opening temperature and then removed.
[0060] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.
Claims
1. A heating structure for a closed working chamber in reflow soldering, characterized in that: During the welding and cooling process of a batch of parts to be welded, the working chamber remains sealed throughout, and the heating structure provides a multi-gradient temperature environment. The heating structure includes: Heat source assembly (1), built into the working chamber, A heat exchange plate (2) covers the heat source assembly (1); the workpiece to be welded is placed on the heat exchange plate (2), and a support rod (101) is fixedly set in the working chamber to support the heat source assembly (1) and the heat exchange plate (2). The distance between the heat source assembly (1) and the bottom wall of the working chamber is set.
2. The reflow soldering sealed working chamber heating structure as described in claim 1, characterized in that: The heat source component (1) includes: The heat source plate (102) is electrically connected to the outside environment and is an electric heating plate. An insulating support plate (103) is placed below the heat source plate (102). An insulating cover (104) is placed over the heat source plate (102). The insulating tray (103) and the insulating cover (104) are fastened together to form a space for accommodating the heat source plate (102).
3. The reflow soldering sealed working chamber heating structure as described in claim 2, characterized in that: The fastening points (105) between the insulating tray (103) and the insulating cover (104) are evenly distributed on the entire heat source assembly (1).
4. The reflow soldering sealed working chamber heating structure as described in claim 2, characterized in that: The thickness of the insulating tray (103) is greater than the thickness of the insulating cover plate (104).
5. The reflow soldering sealed working chamber heating structure as described in claim 1, characterized in that: Multiple heat source components (1) are set in each working chamber, and the gaps between adjacent heat source components (1) are set, with the support rod (101) embedded in the gaps.
6. The reflow soldering sealed working chamber heating structure as described in claim 3, characterized in that: The heat source plate (102) is made of graphite.
7. The reflow soldering sealed working chamber heating structure as described in claim 6, characterized in that: The heating structure of the heat source plate (102) is serpentine, with reserved positions for the fastening point (105) to pass through.
8. The reflow soldering sealed working chamber heating structure as described in claim 2, characterized in that: The insulating tray (103) and the insulating cover (104) are made of ceramic plates.
9. The reflow soldering sealed working chamber heating structure as described in claim 8, characterized in that: The insulating tray (103) has a flange (106), and an opening at the flange (106) forms a conductive through hole (107).