Cold area device for heating chamber of high-temperature vacuum furnace

Abstract

The utility model relates to the technical field of vacuum heating, and discloses a cold area device for a heating chamber of a high-temperature vacuum furnace, which comprises a vacuum furnace provided with a heating module and a vacuumizing module, a furnace cover hinged to the top of the vacuum furnace, and a circle of heat conducting partition plate arranged in the vacuum furnace along the circumferential direction and used for dividing the vacuum furnace into an inner cavity and an outer cavity which are sealed with each other; the air preheating bin is connected with the inner cavity of the vacuum furnace; the circulation air distribution structure comprises an air distribution bin and a cold air nozzle; the air distribution bin is fixedly connected to the vacuum furnace in a sleeving mode, one end of each cold air nozzle is connected with the air distribution bin, the other end of each cold air nozzle penetrates through the side wall of the vacuum furnace, and the multiple cold air nozzles are evenly arranged in the circumferential direction of the vacuum furnace and arranged in the tangential direction with the side wall of the vacuum furnace. The filter box is connected with the air distribution bin and the air preheating bin. Compared with the prior art, the vacuum furnace has the advantages that the vacuum furnace is divided into the inner cavity and the outer cavity through the heat conduction partition plate, cold air is prevented from making direct contact with workpieces, and the cooling effect is more uniform.

Description

Technical Field

[0001] This utility model relates to the field of vacuum heating technology, specifically to a cold zone device for the heating chamber of a high-temperature vacuum furnace. Background Technology

[0002] A high-temperature vacuum furnace heating chamber is a device used for heating in a vacuum environment, primarily in materials science, metallurgy, ceramics, and other fields. It operates under extremely low gas pressure, which facilitates uniform heating of materials and prevents oxidation. Simultaneously, it enables precise temperature control, ensuring the repeatability and accuracy of experimental results.

[0003] Existing high-temperature vacuum furnaces on the market often directly introduce clean external air after vacuum heating to cool the workpiece, thereby achieving heat treatment effects such as annealing. However, the workpiece temperature is high immediately after vacuum heating, while the temperature of the introduced air is low. Furthermore, the airflow generated during the introduction process is uneven in contact with the workpiece, which can easily lead to uneven cooling of the workpiece surface, resulting in a decrease or damage to product quality. At the same time, the cooling temperature is not easy to control and adjust, resulting in poor heat treatment effect and efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical difficulties and provide a cold zone device for the heating chamber of a high-temperature vacuum furnace. After the vacuum heating is completed, the internal cavity is divided and hot air and cold air are introduced into it respectively. The circulating cold air exchanges heat with the hot air around the workpiece, thereby uniformly and controllably cooling the workpiece.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A cold zone device for the heating chamber of a high-temperature vacuum furnace includes a vacuum furnace, equipped with a heating module and a vacuum extraction module, and a furnace cover hinged to the top. It also includes:

[0007] A heat-conducting baffle is arranged circumferentially inside the vacuum furnace, dividing the vacuum furnace into a sealed inner cavity and an outer cavity.

[0008] The air preheating chamber is connected to the inner cavity of the vacuum furnace via a hot air module;

[0009] The circulating air distribution structure includes an air distribution chamber and cold air nozzles. The air distribution chamber is sleeved and fixed on the vacuum furnace. One end of the cold air nozzle is connected to the air distribution chamber, and the other end is set through the side wall of the vacuum furnace. Multiple cold air nozzles are evenly arranged along the circumference of the vacuum furnace and are arranged tangentially with the side wall of the vacuum furnace.

[0010] The filter box is connected to the circulating air distribution structure via a cooling air module and to the air preheating chamber via a duct.

[0011] As improvement, the vacuum furnace bottom is provided with a partition sleeve, a lifting mold group is arranged in the partition sleeve, a heat-conducting partition is slidably arranged in the partition sleeve and connected with the lifting mold group at the bottom, a sealing ring is arranged on the furnace cover, the heat-conducting partition top is sealed after being inserted and matched with the sealing ring, and a stirring fan is rotatably arranged on the furnace cover inside the sealing ring.

[0012] As improvement, the lifting mold group comprises a lifting motor and a screw rod, the screw rod is vertically arranged, one end of the screw rod is rotatably arranged at the vacuum furnace bottom, the other end of the screw rod is connected with a driving shaft of the lifting motor, a threaded sleeve is threadedly sleeved on the screw rod, and the threaded sleeve is connected with the heat-conducting partition bottom.

[0013] As improvement, a tray is arranged in the vacuum furnace, an annular support frame is formed at the tray bottom, the annular support frame is connected with the vacuum furnace bottom wall and circumferentially provided with a plurality of hot air outlets, a hot air module air outlet is connected with the vacuum furnace bottom and arranged below the tray, and hot air in the air preheating bin enters the vacuum furnace through the hot air outlets after the hot air module is started.

[0014] As improvement, a filter element is arranged in the filter box, a one-way valve is arranged between the filter box and the cooling air module, and a one-way valve is arranged between the filter box and the air preheating bin, so that hot air in the air preheating bin is prevented from entering the air distribution bin or cold air in the air distribution bin is prevented from entering the air preheating bin.

[0015] The utility model has the advantages that compared with prior art, the utility model has the advantages that:

[0016] 1. The heat-conducting partition is arranged, after vacuum heating is finished, the internal cavity is divided into an inner cavity and an outer cavity which are sealed from each other by the heat-conducting partition, hot air and cold air are respectively introduced into the inner cavity and the outer cavity, the workpiece is cooled after heat exchange of the hot air, so that the cold air is prevented from directly contacting the workpiece, the cooling effect is more uniform and gentle, and the heat treatment effect of the workpiece is better.

[0017] 2. The cold air is circulated and rotated in the vacuum furnace by the circulating air distribution structure, and then is cooled, the cold air is more uniformly mixed, the temperature is more consistent, and the cooling effect is more uniform.

[0018] 3. The hot air contacts the workpiece, and the temperature of the hot air is controlled by the temperature sensor, so that the temperature of the hot air is kept within a certain range, the heat treatment control ability is stronger, and the utility model is more convenient to use. DRAWINGS

[0019] Figure 1 It is a structure schematic view of the utility model.

[0020] Figure 2 It is a cross section schematic view of the utility model.

[0021] Figure 3 is a cross section schematic view of the circulating air distribution structure of the utility model.

[0022] Figure 4 is a structure schematic view of the lifting module of the utility model.

[0023] Figure 5 is a structure schematic view of the filter box of the utility model.

[0024] As shown in the figure: 1, vacuum furnace; 2, furnace cover; 3, partition sleeve; 4, air preheating bin; 5, air distribution bin; 6, cold air spout; 7, filter box; 8, filter element; 9, check valve; 10, cold air fan; 11, cold air valve; 12, hot air valve; 13, hot air fan; 14, tray; 15, sealing ring; 16, heat-conducting partition; 17, screw rod; 18, threaded sleeve; 19, lifting motor; 20, stirring fan; 21, gas conveying pipe; 22, hot air outlet; 23, heater; 24, annular support frame. DETAILED DESCRIPTION

[0025] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more. In addition, the term "includes" and any variation thereof is intended to cover non-exclusive inclusion.

[0026] The utility model will be further described in detail below in combination with the drawings.

[0027] Embodiment 1

[0028] A cold zone device for heating chamber of high-temperature vacuum furnace, such as Figure 1 , Figure 2As shown, including vacuum furnace 1, which is provided with heating module and vacuum pumping module, and the corresponding pressure sensor and temperature sensor, and the top hinged with furnace cover 2, furnace cover 2 after sealing vacuum furnace 1, vacuum furnace 1 bottom is provided with a partition sleeve 3, the top of the partition sleeve 3 is formed with an annular groove, and the inner top of the furnace cover 2 corresponds to the partition sleeve 3 is provided with a sealing ring 15, the inner side of the sealing ring 15 on the furnace cover 2 is rotatably provided with a stirring fan 20, the stirring fan 20 is driven by the motor, the outer side of the sealing ring 15 on the furnace cover 2 is provided with an exhaust valve (exhaust valve is arranged in the outer cavity), also includes:

[0029] Heat-conducting partition plate 16 and lifting module; heat-conducting partition plate 16 is a vertical plate body provided with a circle in the circumferential direction in the vacuum furnace 1, which has excellent heat conductivity, and is slidably arranged in the partition sleeve 3, and the top is inserted and matched with the sealing ring 15, the lifting module is arranged in the inner side of the partition sleeve 3, including lifting motor 19 and screw rod 17; the screw rod 17 is vertically arranged, and one end is rotatably arranged at the bottom of the vacuum furnace 1, and the other end is connected with the driving shaft of the lifting motor 19; the screw rod 17 is threadedly sleeved with a threaded sleeve 18, and the threaded sleeve 18 is connected with the bottom of the heat-conducting partition plate 16; after the lifting motor 19 is started, the screw rod 17 rotates to drive the heat-conducting partition plate 16 to move upward, until the heat-conducting partition plate 16 is inserted and matched in the sealing ring 15, so that the vacuum furnace 1 is divided into an inner cavity and an outer cavity which are sealed from each other; the workpiece to be vacuum heated is placed in the inner cavity.

[0030] Circulating air distribution structure, such as Figure 3 As shown, including air distribution bin 5 and cold air nozzle 6; air distribution bin 5 is sleeved and fixed on vacuum furnace 1, cold air nozzle 6 is connected with air distribution bin 5 at one end, and is arranged through the side wall of vacuum furnace 1 at the other end, and is arranged in three layers from top to bottom, and each layer of cold air nozzle 6 is uniformly provided with six cold air nozzles along the circumferential direction of vacuum furnace 1, and each cold air nozzle is arranged between the side wall of vacuum furnace 1 and the side wall of vacuum furnace 1 along the tangential direction. After the cold air enters the air distribution bin 5, it enters the outer cavity of the vacuum furnace 1 through the cold air nozzle 6, and forms a rotating cyclone in the outer cavity.

[0031] Air preheating bin 4 and hot air module, such as Figure 4As shown, the air preheating bin 4 is connected with the inner cavity of the vacuum furnace 1 through the hot air module, the air preheating bin 4 is arranged at the bottom of the baffle sleeve 3, and the top is connected with the bottom of the vacuum furnace 1 through the hot air module, a heater 23 is arranged in the air preheating bin 4 for heating air, a tray 14 is arranged in the vacuum furnace 1, an annular support frame 24 is formed at the bottom of the tray 14, the annular support frame 24 is connected to the bottom wall of the vacuum furnace 1, and a plurality of hot air outlets 22 are arranged in the circumferential direction, the hot air module includes a hot air valve 12 and a hot air fan 13, the two are connected through a pipeline, and the air inlet of the hot air fan 13 is connected with the air preheating bin 4 through a pipeline, the outlet of the hot air valve 12 is connected with the bottom of the vacuum furnace 1 and arranged directly below the tray 14, after the hot air fan 13 is started and the hot air valve 12 is opened, hot air in the air preheating bin 4 enters the inner cavity of the vacuum furnace 1 through the hot air outlets 22 to fill the inner cavity and restore the air pressure in the inner cavity through the heat exchange capacity of the inner cavity.

[0032] The filter box 7 and the cooling air module are as shown in the figure. Figure 5 As shown, the cooling air module includes a cooling fan 10 and a cooling valve 11, the two are connected through a pipeline, and the cooling valve 11 is arranged between the cooling fan 10 and the air distribution bin 5, the filter box 7 is provided with an air exchange groove on one side, and a replaceable filter element 8 is arranged inside, the top of the filter box 7 is connected with the air inlet of the air distribution bin 5 through the cooling air module, and a one-way valve 9 is arranged between the cooling air module, the bottom is connected with the air inlet of the air preheating bin 4 through a pipeline, and a one-way valve 9 is arranged between the air preheating bin 4, through the one-way valve 9, the air preheating bin 4 and the air distribution bin 5 can only draw in clean gas treated in the filter box 7.

[0033] In the specific implementation of the embodiment:

[0034] The workpiece to be processed is placed in the vacuum furnace 1 through the bracket, the furnace cover 2 is closed, it is checked whether each valve is normal, the vacuum pumping module is started, and the gas in the vacuum furnace 1 is pumped out to form a vacuum environment, and then the heating module is started to make the temperature in the vacuum furnace 1 rise to a specified temperature, and the workpiece is heated in the vacuum through heat radiation and the like.

[0035] Before the heating is completed, the heater 23 of the air preheating bin 4 is started to heat the clean air in the air preheating bin 4, so that the temperature of the clean air is close to the temperature in the vacuum furnace 1 or reaches a set temperature.

[0036] After the heating is finished, the lifting motor 19 is started, the screw rod 17 rotates to drive the heat-conducting partition plate 16 to move upwards until the heat-conducting partition plate 16 is inserted and matched in the sealing ring 15, so that the vacuum furnace 1 is divided into the inner cavity and the outer cavity which are sealed from each other. After the hot air fan 13 is started and the hot air valve 12 is opened, the hot air in the air preheating bin 4 enters the inner cavity of the vacuum furnace 1 through the hot air port 22 to fill the inner cavity, the air pressure in the inner cavity is recovered and the heat transfer capacity of the inner cavity part is increased, at the same time, the air entering the filter box 7 is filtered by the filter element 8 and then enters the air preheating bin 4 to be supplemented. The stirring fan 20 is opened to stir and mix the hot air in the inner cavity, so that the temperature distribution is more uniform. The cold air fan 10 and the cold air valve 11 are opened, and the air entering the filter box 7 is filtered by the filter element 8, then is largely drawn away and sent into the air distribution bin 5, and then enters the outer cavity of the vacuum furnace 1 through the cold air spout 6 to form a rotating cyclone in the outer cavity. Finally, the air is discharged through the exhaust valve on the furnace cover 2. In the process of rotating in the outer cavity, the rotating cyclone exchanges heat with the hot air in the inner cavity through the heat-conducting partition plate 16, so that the temperature of the hot air in the inner cavity is uniformly reduced, and the workpiece is cooled, thereby preventing the cold air from directly contacting the workpiece and enhancing the uniformity of the cooling of the surface of the workpiece.

[0037] By controlling the temperature of the hot air in the air preheating bin 4, the temperature of the hot air in the inner cavity of the vacuum furnace 1 can be stabilized within a certain range, so that other heat treatment operations can be performed. After complete cooling, the furnace cover 2 is opened and the workpiece is taken out.

[0038] Example 2

[0039] Based on example 1, a gas conveying pipe 21 is further provided, which is provided with a valve and connected with the air preheating bin 4 at one end and connected with a nitrogen tank at the other end. An exhaust valve is arranged on the air preheating bin 4, and a gas content detector is arranged in the air preheating bin 4.

[0040] In the specific implementation of this example:

[0041] The air preheating bin 4 exhaust valve and the gas conveying pipe 21 valve are opened, so that nitrogen enters the air preheating bin 4 and the original air in the air preheating bin 4 is discharged. The nitrogen content in the air preheating bin 4 is detected by the gas content detector, and when the nitrogen content reaches a set value, the air preheating bin 4 heater 23 is started to heat the nitrogen in the air preheating bin 4 to a temperature close to that in the vacuum furnace 1 or to a set temperature, and then the heated nitrogen is sent into the vacuum furnace 1 through the hot air module to prevent the workpiece in the vacuum furnace 1 from being oxidized at high temperature.

[0042] The above has described the utility model and its implementation mode, which is not restrictive, and the drawings only show one of the implementation modes of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. A cold zone device for a heating chamber of a high-temperature vacuum furnace, comprising a vacuum furnace (1) provided with a heating module and a vacuum pumping module, and having a furnace cover (2) hinged to the top, characterized in that, Also include: Thermal baffle (16) is arranged circumferentially in a ring in the vacuum furnace (1), and separates the inner cavity and the outer cavity of the vacuum furnace (1) into each other; Air preheating bin (4) is connected with the inner cavity of the vacuum furnace (1) through the hot air module; The circulating air distribution structure includes air distribution bin (5) and cold air nozzle (6); the air distribution bin (5) is fixedly sleeved on the vacuum furnace (1), one end of the cold air nozzle (6) is connected with the air distribution bin (5), the other end of the cold air nozzle (6) is arranged through the side wall of the vacuum furnace (1), and the cold air nozzle (6) is uniformly arranged in multiple along the circumferential direction of the vacuum furnace (1) and is arranged along the tangential direction between the side wall of the vacuum furnace (1). The filter box (7) is connected with the circulating air distribution structure through the cooling air module and is connected with the air preheating bin (4) through the pipeline.

2. A cold zone device for a high-temperature vacuum furnace heating chamber according to claim 1, characterized in that: The bottom of the vacuum furnace (1) is provided with a baffle sleeve (3), the inner side of the baffle sleeve (3) is provided with a lifting module, the thermal baffle (16) is slidably arranged in the baffle sleeve (3) and is connected with the lifting module at the bottom, and the furnace cover (2) is provided with a sealing ring (15), and the top of the thermal baffle (16) is sealingly connected with the sealing ring (15) after being inserted and matched.

3. A cold zone device for a high-temperature vacuum furnace heating chamber according to claim 2, characterized in that: The lifting module includes a lifting motor (19) and a screw rod (17); the screw rod (17) is vertically arranged, one end of the screw rod (17) is rotatably arranged at the bottom of the vacuum furnace (1), the other end of the screw rod (17) is connected with the driving shaft of the lifting motor (19), the screw rod (17) is threadedly sleeved with a threaded sleeve (18), and the threaded sleeve (18) is connected with the bottom of the thermal baffle (16).

4. The cold zone device for a heating chamber of a high-temperature vacuum furnace according to claim 2, characterized in that: Also include stirring fan (20); the furnace cover (2) is rotatably arranged on the inner side of the sealing ring (15).

5. A cold zone device for a high-temperature vacuum furnace heating chamber according to claim 1, characterized in that: The vacuum furnace (1) is provided with a tray (14), the bottom of the tray (14) is formed with an annular support frame (24), the annular support frame (24) is connected to the bottom wall of the vacuum furnace (1), and a plurality of hot air outlets (22) are arranged along the circumferential direction, the outlet of the hot air module is connected with the bottom of the vacuum furnace (1) and is arranged below the tray (14).

6. A cold zone device for a high-temperature vacuum furnace heating chamber according to claim 1, characterized in that: The filter box (7) is provided with a filter element (8), and a one-way valve (9) is arranged between the filter box (7) and the cooling air module and between the filter box (7) and the air preheating bin (4).

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