Radiant heat recovery device for a baking oven

Abstract

The utility model relates to the technical field of energy -conserving, concretely provides a kind of baking oven radiant heat recovery device, including VC heat plate and integrated heat exchanger, the evaporation section of VC heat plate is closely attached in the outer wall high temperature area of baking oven, condensing section extends to the integrated heat exchanger end, integrated heat exchanger is equipped with medium circulation pipeline, medium circulation pipeline can drive heat exchange medium flow in integrated heat exchanger to further carry out heat exchange with VC heat plate;That is, the present scheme can recycle the radiant heat of baking oven using the " phase-change heat transfer " principle of VC heat pipe, integrated heat exchanger does not need to be directly contacted with the high-temperature gas discharged from baking oven, effectively solve the corrosion and dirt deposition phenomenon caused by integrated heat exchanger being influenced by high-temperature gas, thereby reduce the requirement to integrated heat exchanger material and maintenance cycle, improve the service life and reliability of recovery device;In addition, the recovery device structure and layout process are simple, convenient operation.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology, specifically a radiant heat recovery device for a baking oven. Background Technology

[0002] High-temperature baking of printed circuit boards, semiconductor chips, and photovoltaic modules is a core part of their production process. Currently, baking ovens are commonly used for high-temperature baking. To maintain the stringent process temperature uniformity and stability within the oven cavity, the equipment needs to continuously input energy far exceeding the actual heat absorbed by the workpiece. Moreover, the excess heat is directly discarded through two main pathways: First, the heat-rich process waste gas is directly or forcibly cooled and discharged into the atmosphere through high-temperature exhaust pipes; Second, the heat is continuously diffused into the production workshop through the huge walls of the baking oven in the form of thermal radiation and convection. These two heat energy treatment methods not only cause environmental pollution but also result in energy waste.

[0003] In response to this type of baking energy, the industry has also attempted to use relevant methods for energy recovery, but all of them have significant limitations. For example, attempts have been made to use ordinary shell-and-tube or plate heat exchangers to recover heat from exhaust air. However, trace amounts of organic matter, tin-lead fumes, or other process residues that may be volatilized during the baking process are very easy to condense, adhere to, and carbonize on the heat exchanger wall, forming a solid layer of fouling. This causes the heat exchange efficiency to decline sharply in the short term, and also causes an increase in air resistance, affecting the pressure balance inside the furnace. Frequent shutdowns for cleaning not only seriously disrupt continuous production, but also result in high maintenance costs. In addition, the corrosive components that may be present in the exhaust gas also pose a serious challenge to the materials of conventional heat exchangers.

[0004] Based on the above analysis, this solution proposes a radiant heat recovery device for a baking oven. Utility Model Content

[0005] The purpose of this invention is to provide a radiant heat recovery device for a baking oven. This device absorbs the radiant heat energy of the oven wall based on VC heat exchange plate technology. It does not need to be in direct contact with the high-temperature gas discharged from the oven, thus solving the shortcomings of existing heat exchange equipment, such as easy adhesion of dirt and easy corrosion caused by direct contact with high-temperature gas.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a radiant heat recovery device for a baking oven. The device includes a VC heat exchanger and an integrated heat exchanger. The VC heat exchanger comprises an evaporation section and a condensation section. The evaporation section is closely attached to the high-temperature zone of the outer wall of the baking oven. The condensation section extends to the end of the integrated heat exchanger. The integrated heat exchanger is provided with a medium circulation pipeline, which can drive the heat exchange medium to flow in the integrated heat exchanger and exchange heat with the VC heat exchanger.

[0007] As a preferred embodiment: The evaporation section of the VC heat spreader is an arc-shaped or clamp-shaped structure adapted to the curved surface of the oven wall, and it covers the outer wall of the oven.

[0008] As a preferred embodiment: The integrated heat exchanger is a coil or a heat exchange box. When it is a coil, the coil is arranged on the side of the condensation section and its two ends are connected to the medium circulation pipeline; When it is a heat exchange box, the condensation section of the VC heat exchange plate includes multiple tubes arranged in parallel. At the same time, the heat exchange box wall is provided with a tube sheet, and the heat exchange box is provided with inlet and outlet that communicate with the medium circulation pipeline. The tube sheet is provided with orifices corresponding to the number and position of the tubes. Multiple tubes can be inserted into and sealed in the corresponding orifices to achieve communication with the heat exchange box.

[0009] As a preferred embodiment: The tube sheet comprises two sets, which are respectively disposed at opposite ends of the heat exchange box, and can fix the beginning and end of the tube body.

[0010] As a preferred embodiment: When the integrated heat exchanger is a heat exchange box, the VC heat exchange plate comprises multiple plates arranged in parallel. These multiple VC heat exchange plates are arranged along the height direction of the baking oven and divide the heat exchange box into a medium inflow chamber and a medium outflow chamber.

[0011] As a preferred embodiment: The outer surface of the evaporation section of the VC heat spreader is provided with short fins, which are arranged perpendicular to the axial direction of the evaporation section.

[0012] As a preferred embodiment: The outlet section of the medium circulation pipeline is provided with a heat dissipation branch pipeline, which is connected to the outlet section through a three-way valve. The heat dissipation branch pipeline includes an air-cooled radiator.

[0013] As a preferred embodiment: The evaporation section is tightly attached to the outer wall of the baking oven by thermally conductive adhesive and / or mechanical clamps.

[0014] As a preferred embodiment: The thermally conductive adhesive is a silicone grease or ceramic with a high thermal conductivity.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This waste heat recovery device comprises a VC heat exchanger and an integrated heat exchanger. The VC heat exchanger is positioned between the baking oven and the integrated heat exchanger. Utilizing the "phase change heat transfer" principle of the VC heat exchanger, the radiant heat energy from the oven wall is transferred to the integrated heat exchanger to achieve waste heat recovery. In other words, this solution utilizes the "phase change heat transfer" principle of the VC heat exchanger to recover the radiant heat from the baking oven. The integrated heat exchanger does not need to directly contact the high-temperature gas discharged from the baking oven, effectively solving the problem of corrosion and fouling caused by high-temperature gas on the integrated heat exchanger. This reduces the requirements for the integrated heat exchanger's material and maintenance cycle, and improves the service life and reliability of the recovery device. Furthermore, this recovery device has a simple structure and layout process, is easy to operate, and especially meets the needs of small and medium-sized enterprises, possessing certain economic benefits and market value. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of a radiant heat recovery device for a baking oven provided by this utility model.

[0017] Figure 2 Provided by this utility model Figure 1 A top-view structural diagram.

[0018] Figure 3 Provided by this utility model Figure 1 A schematic diagram of the cross-sectional structure along the AA direction.

[0019] Figure 4 This is a front view structural schematic diagram of another baking oven radiant heat recovery device provided by this utility model.

[0020] Figure 5 Provided by this utility model Figure 4 A top-view structural diagram.

[0021] Figure Labels

[0022] 10 is the baking oven; 11 is the VC heat spreader; 12 is the integrated heat exchanger; 13 is the evaporation section; 14 is the condensation section; 15 is the medium circulation pipeline; 16 is the tube sheet; 17 is the short fins; 18 is the heat dissipation branch pipeline; 19 is the inlet; 20 is the outlet. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention.

[0024] This embodiment provides a radiant heat recovery device for a baking oven. The device includes a VC heat spreader 11 and an integrated heat exchanger 12. The VC heat spreader 11 is a conventional structure, consisting of a vacuum cavity with a metal outer wall. A medium and a reflux structure are provided within the vacuum cavity. The two ends of the VC heat spreader 11 are an evaporation section 13 and a condensation section 14, respectively. The evaporation section 13 is tightly fitted to the high-temperature zone of the outer wall of the baking oven 10. Preferably, in this embodiment, the evaporation section 13 is tightly fitted to the outer wall of the baking oven 10 using thermally conductive adhesive and mechanical clamps. The thermally conductive adhesive is a high thermal conductivity silicone grease or ceramic, thus ensuring that the evaporation section 13 is in close contact with the baking oven. The tightness of the fit improves heat exchange efficiency. The condensing section 14 extends to the end of the integrated heat exchanger 12. The integrated heat exchanger 12 is provided with a medium circulation pipe 15. The medium circulation pipe 15 can drive the heat exchange medium to flow in the integrated heat exchanger 12 and exchange heat with the VC heat exchange plate 11. It is understood that a circulation pump should be provided on the medium circulation pipe 15 as a power source. The specific model and type of the circulation pump can be selected according to actual needs. This embodiment does not limit it here. In addition, in this embodiment, the end of the medium circulation pipe 15 can be connected to a water storage tank or hot water application equipment for equipment preheating, daily use, etc.

[0025] Specifically, in this embodiment, a VC heat exchanger 11 is provided between the baking oven 10 and the integrated heat exchanger 12. The evaporation section 13 of the VC heat exchanger 11 is in close contact with the high-temperature zone wall of the baking oven 10, and the condensation section 14 is connected to the integrated heat exchanger 12. In use, the evaporation section 13 of the VC heat exchanger 11 can absorb the heat energy radiated from the outer wall of the baking oven 10 and cause the medium inside to evaporate and move to the condensation section 14. After reaching the condensation section 14, due to the low temperature at the end of the integrated heat exchanger 12, the heat energy is released and diffused into the integrated heat exchanger 12 through the metal outer wall for heat energy recovery using the heat exchange medium. At the same time, the condensed medium flows back to the evaporation section 13 through the reflux structure of the VC heat exchanger 11, and the cycle continues.

[0026] As can be seen, this embodiment utilizes the "phase change heat transfer" principle of the VC heat exchanger to recover the radiant heat of the baking oven 10. The integrated heat exchanger 12 does not need to directly contact the high-temperature gas discharged from the baking oven 10, effectively solving the problem of corrosion and fouling caused by the high-temperature gas affecting the integrated heat exchanger 12. This reduces the requirements for the material and maintenance cycle of the integrated heat exchanger 12, and improves the service life and reliability of the recovery device. In addition, the recovery device in this embodiment has a simple structure and layout process, is easy to operate, and especially meets the needs of small and medium-sized enterprises, thus having certain economic benefits and market value.

[0027] As a preferred embodiment, the evaporation section 13 of the VC heat spreader 11 is an arc or clamp shape adapted to the curved surface of the oven wall of the baking oven 10, and the condensation section 14 is a plate-like structure, such as... Figure 1-4As shown, the evaporation section 13 covers the outer wall of the baking oven 10. Understandably, the bending angle of the evaporation section 13 should ensure that it can be used normally.

[0028] As a preferred embodiment, the integrated heat exchanger 12 is a coil or a heat exchange box.

[0029] like Figure 1-2 As shown in the figure, the integrated heat exchanger 12 provided in this embodiment is a radiant heat recovery device for a baking oven with a heat exchange box. As can be seen from the figure, in this structure, the condensation section 14 of the VC heat exchange plate 11 includes multiple parallel-arranged tubes; that is, the condensation section 14 is a comb-shaped structure formed by multiple parallel tubes. Meanwhile, a tube sheet 16 is provided on the wall of the heat exchange box, and an inlet 19 and an outlet 20 connected to the medium circulation pipeline 15 are provided on the heat exchange box. The tube sheet 16 has orifices corresponding to the number and position of the tubes, such as... Figure 3 As shown, multiple tubes can be inserted and sealed into corresponding orifices to achieve communication with the heat exchange box. In this embodiment, by setting a tube sheet 16 on the wall of the heat exchange box, it is not necessary to have a separate opening on the wall, which simplifies the design structure. On the other hand, it can achieve a sealed insertion of the tubes, improving the sealing performance of the heat exchange box. It is understood that in order to avoid damaging the heat exchange box, the tube sheet 16 can preferably be welded to the opening of the heat exchange box. In addition, in this embodiment, the inlet 19 on the heat exchange box that is connected to the medium circulation pipeline 15 is preferably located at the top of the heat exchange box, and the outlet 20 is located at the bottom of the heat exchange box. The inlet 19 and the outlet 20 are not on the same side. This design can enhance the flow rate and residence time of the heat exchange medium in the heat exchange box and improve the heat exchange efficiency.

[0030] In this embodiment, the tube sheet 16 includes two sets, which are respectively arranged at opposite ends of the heat exchange box. They can fix the beginning and end of the tube body. Specifically, by setting the two sets of tube sheets 16 on the wall of the heat exchange box, both the front and rear parts of the tube body can be fixed, improving its stability and preventing it from loosening due to the impact of the heat exchange medium, thus affecting normal use.

[0031] In this embodiment, the VC heat exchanger 11 comprises multiple VC heat exchangers arranged in parallel. These multiple VC heat exchangers 11 are arranged along the height direction of the baking oven 10 and divide the heat exchange box into a medium inflow chamber and a medium outflow chamber. That is, the condensation section 14 of the VC heat exchanger 11 acts as a partition to divide the inner cavity of the heat exchange box into two independent chambers. It can be understood that the two independent chambers are connected by comb-shaped tubes. The medium inflow chamber is connected to the inflow section of the medium circulation pipeline 15 through the inlet 19, and the medium outflow chamber is connected to the outflow section of the medium circulation pipeline 15 through the outlet 20. The heat exchange medium enters the medium inflow chamber through the inflow section and then contacts the condensation section 14 for heat exchange. At the same time, it passes through the gap between the tubes and enters the medium outflow chamber. After completing the heat exchange, it is discharged through the outflow section of the medium circulation pipeline 15.

[0032] like Figure 4-5 As shown in the figure, the integrated heat exchanger 12 provided in this embodiment is a radiant heat recovery device for baking oven with a coil structure. As can be seen from the figure, the coil is U-shaped or S-shaped and is arranged on the side of the condensing section 14, with both ends connected to the medium circulation pipeline 15. In this embodiment, the coil can be fixed to the side of the condensing section 14 by pipe clamps or adhesive to absorb the heat energy released by the condensing section 14.

[0033] The above are two preferred structures of the integrated heat exchanger 12 in this embodiment. Under the guidance of this embodiment, other heat exchange structures based on the principle of VC heat exchange plate 11 are also within the protection scope of this embodiment.

[0034] As a preferred embodiment, in order to improve heat exchange efficiency, short fins 17 are preferably provided on the outer surface of the evaporation section 13 of the VC heat exchange plate 11. The short fins 17 are arranged perpendicular to the axial direction of the evaporation section 13. The fins and the VC heat exchange plate 11 can more effectively collect the radiant heat dissipated from the furnace wall into the air, realizing "double-sided heat collection".

[0035] As a preferred embodiment, the outflow section of the medium circulation pipeline 15 is provided with a heat dissipation branch pipeline 18, which is connected to the outflow section through a three-way valve. The heat dissipation branch pipeline 18 includes an air-cooled radiator. Specifically, under normal circumstances, the heat exchange medium flows into the water tank or hot water circulation system through the medium circulation pipeline 15. When the water tank or hot water circulation system is saturated, or when hot air is required, the heat dissipation branch pipeline 18 can be opened through the three-way valve to generate hot air using the air-cooled radiator to heat the required heating environment.

[0036] The specific operating principle of this embodiment includes: A VC heat exchanger plate 11 is installed in the high-temperature zone of the outer wall of the baking oven 10, and the condensation section 14 of the VC heat exchanger plate 11 is extended to the end of the integrated heat exchanger 12. In this embodiment, the integrated heat exchanger 12 is preferably a heat exchange box. During use, the evaporation section 13 of the VC heat exchanger plate 11 absorbs the radiant heat energy diffused from the outer wall of the baking oven 10, and transfers the heat energy to the heat exchange box based on the "phase change heat transfer" principle of the VC heat exchanger plate 11. Energy is recovered through the heat exchange medium flowing through the heat exchange box. The entire heat exchange process does not require direct contact with the high-temperature gas discharged from the baking oven 10, avoiding damage to the heat exchange box and the medium circulation pipeline 15 by residues or harmful substances in the high-temperature gas. This reduces the requirements for the material and maintenance cycle of the integrated heat exchanger 12, and improves the service life and reliability of the recovery device. In addition, the recovery device in this embodiment has a simple structure and layout process, is easy to operate, not only solves the shortcomings of the existing technology, but also meets the needs of small and medium-sized enterprises, and has certain economic benefits and market value.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A radiant heat recovery device for a baking oven, characterized in that: The device includes a VC heat exchanger and an integrated heat exchanger. The VC heat exchanger comprises an evaporation section and a condensation section. The evaporation section is closely attached to the high-temperature zone of the outer wall of the baking oven. The condensation section extends to the end of the integrated heat exchanger. The integrated heat exchanger is provided with a medium circulation pipeline, which can drive the heat exchange medium to flow in the integrated heat exchanger and exchange heat with the VC heat exchanger.

2. The radiant heat recovery device for a baking oven according to claim 1, characterized in that: The evaporation section of the VC heat spreader is an arc-shaped or clamp-shaped structure adapted to the curved surface of the oven wall, and it covers the outer wall of the oven.

3. The radiant heat recovery device for a baking oven according to claim 1, characterized in that: The integrated heat exchanger is a coil or a heat exchange box. When it is a coil, the coil is arranged on the side of the condensation section and its two ends are connected to the medium circulation pipeline; When it is a heat exchange box, the condensation section of the VC heat exchange plate includes multiple tubes arranged in parallel. At the same time, the heat exchange box wall is provided with a tube sheet, and the heat exchange box is provided with inlet and outlet that communicate with the medium circulation pipeline. The tube sheet is provided with orifices corresponding to the number and position of the tubes. Multiple tubes can be inserted into and sealed in the corresponding orifices to achieve communication with the heat exchange box.

4. The radiant heat recovery device for a baking oven according to claim 3, characterized in that: The tube sheet comprises two sets, which are respectively disposed at opposite ends of the heat exchange box, and can fix the beginning and end of the tube body.

5. The radiant heat recovery device for a baking oven according to claim 3, characterized in that: When the integrated heat exchanger is a heat exchange box, the VC heat exchange plate comprises multiple plates arranged in parallel. These multiple VC heat exchange plates are arranged along the height direction of the baking oven and divide the heat exchange box into a medium inflow chamber and a medium outflow chamber.

6. The radiant heat recovery device for a baking oven according to claim 1, characterized in that: The outer surface of the evaporation section of the VC heat spreader is provided with short fins, which are arranged perpendicular to the axial direction of the evaporation section.

7. The radiant heat recovery device for a baking oven according to claim 1, characterized in that: The outlet section of the medium circulation pipeline is provided with a heat dissipation branch pipeline, which is connected to the outlet section through a three-way valve. The heat dissipation branch pipeline includes an air-cooled radiator.

8. The radiant heat recovery device for a baking oven according to claim 1, characterized in that: The evaporation section is tightly attached to the outer wall of the baking oven by thermally conductive adhesive and / or mechanical clamps.

9. The radiant heat recovery device for a baking oven according to claim 8, characterized in that: The thermally conductive adhesive is a silicone grease or ceramic with a high thermal conductivity.

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