Vacuum dehydroxy furnace fast cooling structure

Abstract

The utility model discloses a kind of vacuum dehydroxy furnace fast cooling structure, belong to heat treatment equipment technical field, the structure includes main body box and is arranged at its outside forced circulation cooling loop, the main body box defines furnace space and is equipped with gas outlet and gas inlet, the forced circulation cooling loop includes furnace body gas passage, heat exchanger, fast cooling fan and pipeline, the gas inlet end of furnace body gas passage connects the gas outlet of main body box, the gas inlet end of heat exchanger connects the gas outlet of furnace body gas passage, the gas inlet end of fast cooling fan connects the gas outlet of heat exchanger, pipeline is then connected the pressurizing end of fast cooling fan with the gas inlet of main body box. The utility model is directly transported back to furnace by establishing external forced convection circulation system, and workpiece is cooled, with the advantages of fast cooling speed, cooling uniform, product yield is high and structure is reasonable, easy to maintain.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment equipment technology, and in particular to a rapid cooling structure for a vacuum dehydroxylation furnace. Background Technology

[0002] Vacuum dehydroxylation furnaces, as a key heat treatment equipment, are widely used in high-temperature processing of materials such as quartz glass. In the complete process, after the workpiece is treated at high temperature, it must go through a cooling stage before it can be removed from the furnace and processed. Therefore, the duration of the cooling stage directly affects the efficiency of the entire production cycle.

[0003] Currently, conventional vacuum dehydroxylation furnaces primarily rely on indirect natural cooling during the cooling phase. Specifically, the heat from the high-temperature workpiece is first transferred to the furnace chamber and insulation layer inside the furnace body via thermal radiation, and then transferred layer by layer to the outermost cooling water jacket of the furnace body via thermal conduction, finally being carried away by circulating cooling water. The entire heat transfer path is long, and the efficiency of thermal radiation and natural conduction is relatively low.

[0004] Because the furnace chamber, insulation layer, and other internal components of the furnace have enormous heat capacity, the cooling rate of this indirect cooling method is entirely limited by the overall heat dissipation rate of the furnace itself. This results in an exceptionally slow cooling process for the workpiece, especially in the critical process range from high to medium temperatures. This slow cooling process has become a major bottleneck restricting the improvement of the production efficiency of vacuum dehydrogenation furnaces, not only significantly extending the cycle time of a single production run but also reducing the effective utilization rate of the equipment.

[0005] Therefore, this utility model proposes a rapid cooling structure for a vacuum dehydroxylation furnace to address the shortcomings of existing technologies. Utility Model Content

[0006] In view of the problems in the existing technology of vacuum dehydroxylation furnaces, the cooling process relies entirely on indirect heat dissipation of the furnace body itself, resulting in long heat transfer paths, slow cooling speed and excessively long production cycles. This utility model aims to provide a vacuum dehydroxylation furnace fast cooling structure with improved structure that can effectively solve the above problems.

[0007] This utility model provides a rapid cooling structure for a vacuum dehydroxylation furnace, comprising: a main body box; and a forced circulation cooling circuit disposed outside the main body box, the circuit including a furnace gas passage, a heat exchanger, a rapid cooling fan, and pipes.

[0008] The main box defines the furnace space for accommodating the quartz glass tube, and has gas outlets and gas inlets on its walls as interfaces for connecting with the external circuit.

[0009] Furthermore, the main casing, furnace gas passage, heat exchanger, rapid cooling fan, and pipelines are sequentially combined into a closed gas circulation loop through sealed and fixed connections. Specifically, the inlet end of the furnace gas passage is connected to the gas outlet of the main casing; the inlet end of the heat exchanger is connected to the outlet end of the furnace gas passage; the inlet end of the rapid cooling fan is connected to the outlet end of the heat exchanger; and the pipeline is connected between the pressurization end of the rapid cooling fan and the gas inlet of the main casing, thus connecting the entire loop end-to-end to form a complete system for forced delivery of inert gas for circulating cooling.

[0010] Preferably, the pipeline includes a first pipeline and a second pipeline. The first pipeline and the second pipeline are connected to the pressurization end of the rapid cooling fan by a three-way connector. As a further refinement of this scheme, the outlet end of the first pipeline extends into the furnace space defined by the main body box so as to directly transport the main part of the cooled gas to the vicinity of the high-temperature workpiece. The outlet end of the second pipeline is connected to the furnace gas channel to achieve auxiliary cooling of the furnace door and channel area, thereby ensuring the overall cooling coordination.

[0011] Preferably, the main body box has an inner furnace chamber coaxially arranged inside, and the upper and lower parts of the inner furnace chamber are provided with ventilation holes for uniform airflow. This structure design helps to effectively buffer and disperse the cooling gas that enters the furnace chamber at high speed from the first pipe, so that it can be more evenly distributed in all corners of the furnace chamber and the entire surface of the workpiece, avoiding thermal stress caused by local overcooling due to direct gas impact.

[0012] Preferably, the main body box includes a furnace body and a furnace door. The specific location of the gas channel of the furnace body is arranged in the joint gap between the furnace body and the furnace door. This layout cleverly utilizes the original structural space of the equipment, making the arrangement of external pipelines more compact and reasonable, and reducing additional space occupation.

[0013] Preferably, there are two rapid cooling fans, and these two rapid cooling fans are symmetrically fixedly installed on the outer surface of the furnace door of the main body box. The symmetrical arrangement of the two fans can not only provide a stronger and more stable gas circulation power, ensuring sufficient gas flow even in a negative pressure environment, but also improve the reliability of the system.

[0014] Preferably, the structure further includes a first bracket and a second bracket. The heat exchanger is fixedly installed in a preset position via the first bracket, while the fast-cooling fan is fixedly installed in a preset position via the second bracket. These two brackets provide a stable and reliable installation foundation for the core components of the circulation loop located outside the furnace body, ensuring the structural stability and safety of the equipment during long-term operation.

[0015] This utility model has the following beneficial effects: 1. This utility model solves the problems of long heat transfer path, low cooling efficiency and long production cycle caused by the indirect cooling method in the prior art by setting a forced circulation cooling circuit consisting of a fast cooling fan, heat exchanger and pipeline outside the furnace body, and directly transporting the cooled inert gas into the furnace to contact the high temperature workpiece. It achieves the technical effect of improving the cooling speed and effectively shortening the process time.

[0016] 2. This utility model, by setting up a diversion pipe and opening a vent hole on the inner furnace, guides and evenly distributes the cooled inert gas, which solves the problem that natural cooling in the prior art may lead to excessive temperature difference and uneven cooling in different parts of the workpiece, thereby generating thermal stress or even causing the workpiece to crack. It achieves the technical effect of making the temperature of the workpiece surface and the inside of the furnace drop evenly and improving the product yield.

[0017] 3. This utility model, by modularly setting core cooling components such as heat exchangers and fast-cooling fans outside the main body and using brackets for independent support and fixation, solves the problem in the prior art where the cooling device is integrated inside the furnace body or has complex connections, resulting in difficult installation and inconvenient maintenance and repair. It achieves the technical effect of reasonable and compact overall structural layout, convenient installation, and easy maintenance and repair. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of a rapid cooling structure for a vacuum dehydroxylation furnace proposed in this utility model; Figure 2 This is a schematic diagram of the heat exchanger of a vacuum dehydroxylation furnace rapid cooling structure proposed in this utility model; Figure 3 This is a schematic diagram of the quartz glass tube of the vacuum dehydroxylation furnace rapid cooling structure proposed in this utility model; Figure 4 This is a schematic diagram of the rapid cooling fan for a vacuum dehydroxylation furnace rapid cooling structure proposed in this utility model.

[0019] Legend: 1. Heat exchanger; 2. Fast cooling fan; 3. Furnace body gas passage; 4. Quartz glass tube; 5. Vent hole; 6. Main body box; 7. First support; 8. Second support; 9. First pipe; 10. Second pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please refer to Figures 1 to 4 This utility model provides a rapid cooling structure for a vacuum dehydroxylation furnace, which aims to solve the problems in the prior art where the cooling of workpieces in a vacuum furnace relies on indirect heat transfer, resulting in slow cooling speed and long production cycle.

[0022] like Figure 1 As shown, the rapid cooling structure of the vacuum dehydroxylation furnace includes a main body box 6 and a forced circulation cooling loop located outside the main body box 6. The main body box 6 defines the furnace space for accommodating the quartz glass tube 4, and the wall of the main body box 6 is provided with a gas outlet and a gas inlet as interfaces for connecting with the forced circulation cooling loop. The forced circulation cooling loop is sealed and fixedly connected to the gas outlet and gas inlet by flanges and gaskets respectively. The forced circulation cooling loop as a whole constitutes a closed-loop system for forcibly guiding inert gas to circulate and cool. The loop specifically includes a furnace gas channel 3, a heat exchanger 1, a rapid cooling fan 2, and pipes. During operation, the high-temperature inert gas flows out from the gas outlet of the main body box 6, passes through the furnace gas channel 3, the heat exchanger 1, the rapid cooling fan 2, and the pipes in sequence, and finally returns to the furnace space through the gas inlet of the main body box 6, forming a complete and controlled closed-loop flow path.

[0023] To solve the above-mentioned technical problems, the core of the technical solution of this embodiment is that the forced circulation cooling circuit forms an efficient and stable closed-loop gas circulation path through the specific connection relationship between the components.

[0024] Please refer to the following carefully. Figure 1 , Figure 2 and Figure 4 The core structure will be described in detail below: The inlet end of the furnace gas channel 3 is sealed and fixedly connected to the gas outlet of the main body box 6 to guide the high-temperature inert gas extracted from the main body box 6. The heat exchanger 1 is provided with an inlet end and an outlet end. Its inlet end is sealed and fixedly connected to the outlet end of the furnace gas channel 3 through a flange. The high-temperature inert gas enters the heat exchanger 1 and exchanges heat with the internal cooling coil to cool down. The fast cooling fan 2 has an inlet end with negative pressure suction and a pressurizing end for pressurization. Its inlet end is sealed and fixedly connected to the outlet end of the heat exchanger 1 by direct welding of a pipe. The pipeline is used to extract and transport gas. One end of the pipeline is sealed and fixedly connected to the pressurization end of the rapid cooling fan 2, and the other end is sealed and fixedly connected to the gas inlet of the main body box 6. Thus, the main body box 6, the furnace gas channel 3, the heat exchanger 1 and the rapid cooling fan 2 are connected in sequence to form a complete closed gas circulation loop. This structure ensures that the inert gas can be forced and circulated in an orderly manner under negative pressure, realizing a continuous process of extraction from the furnace, external cooling and repressurization and return, thereby directly and efficiently cooling the quartz glass tube 4 in the furnace space.

[0025] Based on the above embodiments, the present invention may further include the following preferred technical solutions: In a preferred embodiment, the pipeline includes a first pipeline 9 and a second pipeline 10. The first pipeline 9 and the second pipeline 10 are connected to the pressurizing end of the fast cooling fan 2 via a tee connector. The outlet end of the first pipeline 9 extends into the furnace space defined by the main body box 6, and is used to directly transport most of the cooled gas to the vicinity of the workpiece. The outlet end of the second pipeline 10 is connected to the furnace gas channel 3, and is used to transport some gas to assist in cooling the furnace door and channel area.

[0026] As a further preferred embodiment, the main body box 6 is coaxially provided with an inner furnace chamber. The upper and lower parts of the inner furnace chamber are provided with ventilation holes 5 for uniformly distributing airflow. These ventilation holes 5 help to guide and disperse the cooling gas entering from the first pipe 9, ensuring that the gas can act evenly on the entire outer surface of the quartz glass tube 4 and the internal space of the furnace chamber.

[0027] As a further preferred embodiment, the main body box 6 includes a furnace body and a furnace door. The specific location of the furnace body gas channel 3 is arranged in the joint gap between the furnace body and the furnace door. This arrangement utilizes the inherent space between the furnace body structures, making the pipeline layout more compact.

[0028] As a further preferred embodiment, there are two rapid cooling fans 2, and the two rapid cooling fans 2 are symmetrically fixedly installed on the outer surface of the furnace door of the main body box 6. The dual-fan configuration provides stronger gas circulation power and system redundancy.

[0029] As a further preferred embodiment, the structure also includes a first bracket 7 and a second bracket 8 for support and fixation. The heat exchanger 1 is fixedly installed in a preset position via the first bracket 7, and the fast-cooling fan 2 is fixedly installed in a preset position via the second bracket 8. The first bracket 7 and the second bracket 8 provide a reliable physical basis for the stable operation of the entire external circulation loop.

[0030] The working principle of the rapid cooling structure of the vacuum dehydroxylation furnace of this utility model is as follows: When cooling the quartz glass tube 4 inside the main chamber 6, high-purity inert gas is first introduced into the main chamber 6 and kept under negative pressure. It should be noted that the cooling method used is not a completely new structure; its core principle is the same as the original cooling method, which accelerates the cooling of the quartz glass tube through the flow of inert gas. The original cooling structure utilized the inner furnace chamber of the main chamber 6 and vents located above and below the furnace chamber to conduct inert gas, which then gradually transferred the cooling effect from the surface of the quartz glass tube to the interior. The optimized structure further enhances the gas circulation efficiency. Additionally, the main chamber 6 itself and the furnace door are designed with inert gas channels (the relevant structure is not specifically described in the existing description), providing a foundation for smooth gas flow. Subsequently, two rapid cooling fans 2, fixedly installed on the outside of the furnace door of the main chamber 6, are started. Considering the actual flow direction of the inert gas, the inlet of the rapid cooling fans 2 first draws in inert gas from inside the main chamber 6. This gas, upon contact with the high-temperature quartz glass tube 4... The gas, heated to a high-temperature inert gas, is then guided through pipe 9 to the inlet of heat exchanger 1. Upon entering heat exchanger 1, the high-temperature inert gas undergoes efficient heat exchange with the cooling medium, resulting in a significant temperature reduction and transformation into a low-temperature inert gas. The cooled gas flows out from the outlet of heat exchanger 1 and is immediately drawn into the inlet of rapid cooling fan 2. Inside the rapid cooling fan 2, the low-temperature inert gas is pressurized at its pressurization end, increasing both its pressure and flow rate. The pressurized low-temperature gas is discharged from the pressurized end of the fast-cooling fan 2, enters the pipeline system, and is split through the tee connector. Finally, it is sent into the main body box 6 through the pipeline 10. Most of the low-temperature inert gas, with the assistance of the ventilation holes 5 (including the ventilation holes above and below the furnace in the original structure), directly and evenly washes the surface of the high-temperature quartz glass tube 4, quickly removing its heat. The other part of the gas can assist in cooling the relevant areas of the furnace body. The whole process forms a continuous closed-loop forced convection circulation. Through the direct contact between the low-temperature inert gas and the high-temperature workpiece, the cooling rate is further improved on the basis of continuing the cooling logic of the original structure.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rapid cooling structure for a vacuum dehydroxylation furnace, comprising: The main body box (6) defines a furnace space for accommodating the quartz glass tube (4), and the main body box (6) has a gas outlet and a gas inlet on its wall. The structure is characterized in that it further includes a forced circulation cooling circuit disposed outside the main body box (6), the forced circulation cooling circuit comprising: Furnace body gas channel (3), the gas inlet end of the furnace body gas channel (3) is sealed and fixedly connected to the gas outlet of the main body box (6); Heat exchanger (1), the heat exchanger (1) is provided with an inlet end and an outlet end, the inlet end of which is sealed and fixedly connected to the outlet end of the gas channel (3) of the furnace body; The fast cooling fan (2) has an air inlet with negative pressure suction and a pressurizing end for pressurization. Its air inlet is sealed and fixedly connected to the air outlet of the heat exchanger (1). The pipeline has one end sealed and fixedly connected to the pressurization end of the fast cooling fan (2), and the other end sealed and fixedly connected to the gas inlet of the main body box (6), thereby connecting the main body box (6), furnace gas channel (3), heat exchanger (1) and fast cooling fan (2) in sequence to form a closed gas circulation loop.

2. The rapid cooling structure of the vacuum dehydroxylation furnace according to claim 1, characterized in that, The pipeline includes a first pipeline (9) and a second pipeline (10), which are connected to the pressurization end of the fast-cooling fan (2) via a tee connector.

3. The rapid cooling structure of the vacuum dehydroxylation furnace according to claim 2, characterized in that, The outlet end of the first pipe (9) extends into the furnace space defined by the main body box (6).

4. The rapid cooling structure of the vacuum dehydroxylation furnace according to claim 2, characterized in that, The outlet end of the second pipe (10) is connected to the gas passage (3) of the furnace body.

5. The rapid cooling structure of the vacuum dehydroxylation furnace according to claim 1, characterized in that, The main body box (6) has an inner furnace chamber coaxially arranged inside, and the upper and lower parts of the inner furnace chamber are provided with ventilation holes (5) for uniformly distributing airflow.

6. The rapid cooling structure of the vacuum dehydroxylation furnace according to claim 1, characterized in that, The main body box (6) includes a furnace body and a furnace door. The specific location of the furnace body gas channel (3) is located at the joint gap between the furnace body and the furnace door.

7. The rapid cooling structure of the vacuum dehydroxylation furnace according to claim 1, characterized in that, The number of the fast cooling fans (2) is two, and the two fast cooling fans (2) are symmetrically fixedly installed on the outer surface of the furnace door of the main body box (6).

8. The rapid cooling structure of the vacuum dehydroxylation furnace according to claim 1, characterized in that, The structure also includes a first bracket (7) and a second bracket (8) for support and fixation. The heat exchanger (1) is fixedly installed in a preset position by the first bracket (7), and the fast-cooling fan (2) is fixedly installed in a preset position by the second bracket (8).

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