Circulating gas cooled vacuum furnace

Abstract

This utility model discloses a circulating air-cooled vacuum furnace, including a furnace body, an internal support frame, a heating component at the rear end of the support frame, a workpiece tray slidably connected to the middle of the support frame, a vacuum pipe on the rear side wall of the furnace body, and a cooling component. The cooling component includes an air inlet pipe, a lower pipe, jet holes, a coolant pipe, and a vacuum extraction pipe. The air inlet pipe is fixedly connected to the upper left side of the furnace body, and its lower end is located at the middle left end of the support frame. The lower right side wall of the air inlet pipe has evenly distributed jet holes. The lower pipe is fixedly connected to the branch port at the lower end of the air inlet pipe. The lower pipe works in conjunction with the workpiece tray. This circulating air-cooled vacuum furnace, through an integrated cooling design of bidirectional air supply, pre-cooling, and circulating vacuum extraction, achieves synchronous and uniform cooling of the workpiece and the workpiece tray, significantly improving cooling efficiency and uniformity.

Description

Technical Field

[0001] This utility model relates to the field of vacuum furnace technology, specifically a circulating gas-cooled vacuum furnace. Background Technology

[0002] In modern industrial production, vacuum heat treatment technology is widely used in high-end fields such as aerospace, automobile manufacturing, and precision machinery because it can reduce workpiece oxidation and decarburization, and ensure processing accuracy and performance stability. With the continuous improvement of material performance requirements for industrial products, vacuum furnaces, as core heat treatment equipment, directly affect the final quality and production efficiency of workpieces due to their key indicators such as heating efficiency, temperature control accuracy, and cooling rate. This has become an important direction for technological upgrading in the industry. Currently, vacuum furnaces on the market mainly consist of a furnace body, heating system, vacuum system, and cooling system. Their working process typically involves first using a vacuuming device to... Air is extracted from the furnace to create a vacuum environment. The heating system is then activated to heat the workpiece inside the furnace. During this process, the temperature inside the furnace is monitored by a temperature sensor to ensure that the heating process meets the process requirements. After the workpiece has completed the heating process, the cooling system, such as air cooling, is activated to reduce the temperature inside the furnace, thus completing the entire heat treatment process. Existing vacuum furnace cooling systems have some problems. The cooling gas is mostly blown in one direction, which makes it difficult to achieve rapid cooling of the workpiece and cannot simultaneously cool the tray holding the workpiece. This causes the tray to continuously conduct heat, indirectly reducing the cooling efficiency of the workpiece. Therefore, we propose a circulating gas-cooled vacuum furnace. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a circulating air-cooled vacuum furnace. Through the integrated cooling design of bidirectional air supply, pre-cooling and circulating air extraction, the workpiece and the tray are cooled synchronously and uniformly, which greatly improves the cooling efficiency and cooling uniformity and can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a circulating gas-cooled vacuum furnace, comprising a furnace body, an internal support frame, a heating component at the rear end of the support frame, a tray slidably connected to the middle of the support frame, a vacuum tube on the rear side wall of the furnace body, and a cooling component.

[0005] Cooling assembly: It includes an air inlet pipe, a lower pipe, jet nozzles, a coolant pipe, and an exhaust pipe. The air inlet pipe is fixedly connected to the upper left side of the furnace body, and its lower end is located at the middle left end of the support frame. The lower right side wall of the air inlet pipe has evenly distributed jet nozzles. The lower pipe is fixedly connected to the branch port at the lower end of the air inlet pipe and is used in conjunction with the workpiece tray. The left and right side walls of the support frame have openings that are used in conjunction with the lower pipe. The exhaust pipe is fixedly connected to the upper right side of the furnace body, and its lower end is located at the middle right end of the support frame. The coolant pipe is located inside the air inlet pipe, and its upper and lower left ends both penetrate the left end of the furnace body. Through the integrated cooling design of bidirectional air supply, pre-cooling, and circulating exhaust, the workpiece and workpiece tray are cooled synchronously and uniformly, greatly improving cooling efficiency and cooling uniformity.

[0006] Furthermore, a controller is provided at the right end of the furnace body, and the input terminal of the controller is electrically connected to an external power source for stable control.

[0007] Furthermore, a limiting baffle is fixedly connected to the upper end of the support frame, and the rear end of the item tray contacts the front side of the limiting baffle to limit the extreme position of the item tray's backward movement.

[0008] Furthermore, the heating assembly includes a mounting bracket and heating tubes. The mounting bracket is fixedly connected to the upper middle part of the support frame. The front side of the mounting bracket is equipped with evenly distributed heating tubes. The input ends of the heating tubes are electrically connected to the output end of the controller for stable heating.

[0009] Furthermore, the heating assembly also includes an aluminum foil reflector and an angled aluminum foil reflector. The aluminum foil reflector is fixedly connected to the front side of the mounting frame, and the angled aluminum foil reflector is fixedly connected to the upper end of the mounting frame for reflecting heat.

[0010] Furthermore, an infrared temperature sensor is installed at the upper interior of the furnace body. The infrared temperature sensor is bidirectionally electrically connected to the controller to detect the temperature in real time.

[0011] Furthermore, a vacuum pressure gauge is installed at the upper end of the furnace body. The probe of the vacuum pressure gauge extends into the interior of the furnace body. The vacuum pressure gauge is bidirectionally electrically connected to the controller to detect the vacuum level inside the furnace body.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This circulating gas-cooled vacuum furnace has the following advantages:

[0013] The cooling assembly pre-cools the cooling gas through the coolant pipe inside the air intake pipe. Combined with the bidirectional air supply design of the upper jet hole and the lower pipe, it can blow air from the top and bottom of the workpiece. With the synchronous air extraction of the exhaust pipe, it forms a highly efficient cooling cycle, which greatly improves the cooling speed. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the left end of the furnace body of this utility model;

[0016] Figure 3 This is a schematic diagram of the front plane of the furnace body of this utility model;

[0017] Figure 4 This is a partial structural schematic diagram of the air intake pipe of this utility model;

[0018] Figure 5 This is a schematic diagram of the rear end of this utility model.

[0019] In the diagram: 1 Furnace body, 2 Cooling components, 21 Air inlet pipe, 22 Lower pipe, 23 Jet nozzle, 24 Coolant pipe, 25 Extraction pipe, 3 Heating components, 31 Mounting bracket, 32 Heating tube, 33 Aluminum foil reflector, 34 Slanted aluminum foil reflector, 4 Infrared temperature sensor, 5 Support frame, 6 Opening, 7 Vacuum pressure gauge, 8 Vacuum extraction tube, 9 Controller, 10 Item tray, 11 Limiting baffle. 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 see Figure 1-5 This embodiment provides a technical solution: a circulating gas-cooled vacuum furnace, including a furnace body 1. A controller 9 is provided at the right end of the furnace body 1. The input end of the controller 9 is electrically connected to an external power source. A furnace door is rotatably connected to the front right side of the furnace body 1. A ceramic sealing gasket is provided at the edge of the furnace door. A door lock is provided between the left end of the furnace door and the furnace body 1. The door lock is a manual lock commonly used in vacuum furnaces. The manual lock is usually installed on the outer edge of the furnace door or at the corresponding door frame position of the furnace body 1. When the furnace door is fitted into the furnace body 1 and fits against the sealing surface of the furnace body 1, the internal screw is driven to tighten and tighten the circumferentially distributed locking bolts by rotating the door handle, or the linkage buckle is engaged, and uniform pressure is applied from the outside of the furnace door towards the furnace body 1 to press the furnace door tightly against the sealing element, thereby achieving locking and vacuum sealing.

[0022] The furnace body 1 is equipped with a support frame 5 inside, and a heating component 3 is provided at the rear end of the support frame 5. A work tray 10 is slidably connected to the middle of the support frame 5. A limit baffle 11 is fixedly connected to the upper end of the support frame 5. The rear end of the work tray 10 contacts the front side of the limit baffle 11. A vacuum tube 8 is provided on the rear side wall of the furnace body 1. A vacuum pressure gauge 7 is installed at the upper end of the furnace body 1. The probe of the vacuum pressure gauge 7 extends into the interior of the furnace body 1. The vacuum pressure gauge 7 is bidirectionally electrically connected to the controller 9.

[0023] First, open the furnace door and place the workpiece to be heat-treated on the workpiece tray 10. The workpiece tray 10 can slide along the support frame 5 to facilitate the movement of the workpiece to the heating area. The limit baffle 11 prevents the workpiece from shifting due to excessive sliding of the tray. Then, close the furnace door and connect an external vacuum pump through the vacuum pipe 8 on the rear side wall of the furnace body 1 to extract the air in the furnace and form the vacuum environment required for processing. The vacuum pressure gauge 7 monitors the vacuum level in the furnace in real time and transmits the data to the controller 9 so that the operator can keep track of the vacuum status. The furnace also includes a cooling component 2.

[0024] Cooling assembly 2 includes an air inlet pipe 21, a lower pipe 22, jet nozzles 23, a coolant pipe 24, and an exhaust pipe 25. The air inlet pipe 21 is fixedly connected to the upper left side of the furnace body 1, and its lower end is located at the middle left end of the support frame 5. Evenly distributed jet nozzles 23 are provided on the lower right side wall of the air inlet pipe 21. The lower pipe 22 is fixedly connected to the branch openings at the lower end of the air inlet pipe 21 and is used in conjunction with the work tray 10. Openings 6 are provided on both the left and right side walls of the support frame 5 and are used in conjunction with the lower pipe 22. The exhaust pipe 25 is fixedly connected to the upper right side of the furnace body 1, and its lower end is located at the middle right end of the support frame 5. The coolant pipe 24 is located inside the air inlet pipe 21. The upper and lower left sides of the furnace body 1 are both penetrating the left end. During cooling, the cooling gas draws in external air through the fan installed at the upper end of the air inlet pipe 21 and enters through the air inlet pipe 21. Coolant is introduced into the coolant pipe 24 through the upper end of the coolant pipe 24. The air entering the air inlet pipe 21 passes through the coolant pipe 24 and exchanges heat with the coolant pipe 24 for pre-cooling. Part of the pre-cooled gas is blown directly onto the workpiece through the jet hole 23 at the lower end of the air inlet pipe 21, and the other part passes through the opening 6 of the support frame 5 through the lower pipe 22 and blows towards the bottom of the workpiece tray 10, achieving all-round cooling of the workpiece. During this process, the negative pressure fan connected to the upper end of the exhaust pipe 25 works synchronously. The gas that has absorbed heat is discharged through the exhaust pipe 25, completing the cooling cycle and quickly reducing the temperature of the workpiece.

[0025] The heating assembly 3 includes a mounting bracket 31 and heating tubes 32. The mounting bracket 31 is fixedly connected to the upper middle part of the support frame 5. The heating tubes 32 are evenly distributed on the front side of the mounting bracket 31. The input ends of the heating tubes 32 are electrically connected to the output ends of the controller 9. The controller 9 starts the heating assembly 3. After the heating tubes 32 are powered on, they generate heat to provide the workpiece with the temperature required for processing.

[0026] The heating assembly 3 also includes an aluminum foil reflector 33 and an oblique aluminum foil reflector 34. The aluminum foil reflector 33 is fixedly connected to the front side of the mounting frame 31, and the oblique aluminum foil reflector 34 is fixedly connected to the upper end of the mounting frame 31. When the workpiece is heated, the aluminum foil reflector 33 reflects the heat from the heating tube 32 to the workpiece direction, and the oblique aluminum foil reflector 34 further concentrates the heat, reduces heat loss, and improves heating efficiency.

[0027] An infrared temperature sensor 4 is installed at the upper part of the furnace body 1. The infrared temperature sensor 4 is bidirectionally electrically connected to the controller 9. The installation position of the infrared temperature sensor 4 can detect the temperature of the workpiece area in the furnace in real time and feed it back to the controller 9 to provide feedback on the temperature of the workpiece during heating and cooling.

[0028] The working principle of the circulating air-cooled vacuum furnace provided by this utility model is as follows: First, open the furnace door and place the workpiece to be heat-treated on the workpiece tray 10. The workpiece tray 10 can slide along the support frame 5 to facilitate the movement of the workpiece to the heating area. The limiting baffle 11 prevents the workpiece from shifting due to excessive sliding of the tray. Then, close the furnace door and connect an external vacuum pump through the vacuum pipe 8 on the rear side wall of the furnace body 1 to extract the air inside the furnace and form the vacuum environment required for processing. The vacuum pressure gauge 7 monitors the vacuum level inside the furnace in real time, and the data is transmitted to the controller 9 so that the operator can monitor the vacuum status. The controller 9 starts the heating component 3. After the heating tube 32 is powered on, it generates heat to provide the workpiece with the temperature required for processing. The aluminum foil reflector 33 reflects the heat of the heating tube 32 to the workpiece direction, and the oblique aluminum foil reflector 34 further concentrates the heat, reduces heat loss, and improves heating efficiency. During cooling, the cooling gas... The air intake duct 21 draws in external air through a fan installed at the top. Coolant is introduced into the coolant pipe 24 through the top. The air entering the intake duct 21 passes through the coolant pipe 24 and undergoes heat exchange with it for pre-cooling. Part of the pre-cooled air is blown directly onto the workpiece through the jet hole 23 at the bottom of the intake duct 21, while the other part passes through the lower pipe 22 through the opening 6 of the support frame 5 and is blown towards the area below the workpiece tray 10, achieving all-round cooling of the workpiece. During this process, the negative pressure fan connected to the top of the exhaust duct 25 works synchronously. The heat-absorbing air is discharged through the exhaust duct 25, completing the cooling cycle and rapidly reducing the workpiece temperature. During this process, the infrared temperature sensor 4 can detect the temperature of the workpiece area in the furnace in real time and feed it back to the controller 9, providing feedback on the workpiece temperature during heating and cooling.

[0029] It is worth noting that the heating tube 32 disclosed in the above embodiments can be model GH4080, the infrared temperature sensor 4 can be model OS137-1, the vacuum pressure gauge 7 can be model CMR261, and the controller 9 can be model S7-1200. The controller 9 controls the operation of the heating tube 32, the infrared temperature sensor 4 and the vacuum pressure gauge 7 using methods commonly used in the prior art.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A circulating gas-cooled vacuum furnace, comprising a furnace body (1), wherein a support frame (5) is provided inside the furnace body (1), a heating component (3) is provided at the rear end of the support frame (5), a tray (10) is slidably connected to the middle of the support frame (5), and a vacuum tube (8) is provided on the rear side wall of the furnace body (1), characterized in that: It also includes a cooling component (2); Cooling assembly (2): It includes an air inlet pipe (21), a lower pipe (22), jet holes (23), a coolant pipe (24), and an exhaust pipe (25). The air inlet pipe (21) is fixedly connected to the upper left side of the furnace body (1). The lower end of the air inlet pipe (21) is located at the middle left end of the support frame (5). The lower right side wall of the air inlet pipe (21) is provided with evenly distributed jet holes (23). The lower pipe (22) is fixedly connected to the branches at the lower end of the air inlet pipe (21). Inside the opening, the lower pipe (22) is used in conjunction with the item tray (10). The left and right side walls of the support frame (5) are provided with openings (6) and are used in conjunction with the lower pipe (22). The exhaust pipe (25) is fixedly connected to the upper right side of the furnace body (1). The lower end of the exhaust pipe (25) is located at the middle right end of the support frame (5). The coolant pipe (24) is set inside the air inlet pipe (21). The upper and lower left ends of the coolant pipe (24) penetrate the left end of the furnace body (1).

2. A circulating gas-cooled vacuum furnace according to claim 1, characterized in that: The right end of the furnace body (1) is provided with a controller (9), and the input end of the controller (9) is electrically connected to an external power source.

3. A circulating gas-cooled vacuum furnace as claimed in claim 1, characterized in that: The upper end of the support frame (5) is fixedly connected to a limiting baffle (11), and the rear end of the item tray (10) is in contact with the front side of the limiting baffle (11).

4. A circulating gas-cooled vacuum furnace as claimed in claim 2, characterized in that: The heating component (3) includes a mounting bracket (31) and heating tubes (32). The mounting bracket (31) is fixedly connected to the upper middle part of the support frame (5). The front side of the mounting bracket (31) is equipped with evenly distributed heating tubes (32). The input end of the heating tubes (32) is electrically connected to the output end of the controller (9).

5. A circulating gas-cooled vacuum furnace according to claim 4, characterized in that: The heating assembly (3) also includes an aluminum foil reflector (33) and an oblique aluminum foil reflector (34). The aluminum foil reflector (33) is fixedly connected to the front side of the mounting frame (31), and the oblique aluminum foil reflector (34) is fixedly connected to the upper end of the mounting frame (31).

6. A circulating gas-cooled vacuum furnace as claimed in claim 2, characterized in that: An infrared temperature sensor (4) is installed at the upper part of the furnace body (1), and the infrared temperature sensor (4) is bidirectionally electrically connected to the controller (9).

7. A circulating gas-cooled vacuum furnace as claimed in claim 2, characterized in that: A vacuum pressure gauge (7) is installed at the upper end of the furnace body (1). The probe of the vacuum pressure gauge (7) extends into the interior of the furnace body (1). The vacuum pressure gauge (7) is bidirectionally electrically connected to the controller (9).

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