Air cooling system for horizontal vacuum high-pressure air quenching

[0022] The preferred specific implementation of the air-cooled system for horizontal vacuum high-pressure gas quenching of the present invention is:

[0023] Including fan, impeller, volute, air inlet pipe, air inlet duct, damper I, upper air duct, upper small heat shield, damper II, return air duct, heat exchanger, return air duct, lower air duct, lower air duct Heat shield

[0024] The impeller is a centrifugal impeller, which is connected with the output shaft of the fan and is installed in a volute, and the volute has an inlet and an outlet;

[0025] One end of the air inlet pipeline is connected with the outlet of the volute, and the other end is connected with the air inlet of the furnace shell;

[0026] The air inlet duct is enclosed by the enclosure, the damper I, and the inner wall of the furnace shell to form a cavity, and the cavity is connected with the air inlet pipeline, the upper air duct and the lower air duct;

[0027] The upper air duct is enclosed by a wall, the inner wall of the furnace shell, the furnace shell, and the upper heat shield to form a cavity, and both ends of the cavity are respectively connected with the air inlet duct and the return air duct;

[0028] The lower air duct is enclosed by a wall, the inner wall of the furnace shell, the furnace shell, and the lower heat shield to form a cavity, and both ends of the cavity are respectively connected with the air inlet duct and the return air duct;

[0029] The return air duct is surrounded by a wall, the damper II, and the inner wall of the furnace shell to form a cavity, and the cavity is connected with the return air duct, the upper air duct and the lower air duct;

[0030] One end of the return air pipeline is connected with the air outlet of the furnace shell, and the other end is connected with the inlet of the volute after the heat exchanger is connected in series.

[0031] The damper I is a translational structure, which is installed in the air inlet duct, is driven by a cylinder, and slides up and down along the guide rail to open the passage between the air inlet duct and the upper air duct/down air duct and connect it to the lower air duct/upwind The passage between the roads is closed, and the air inlet direction is switched through the movement of the damper I;

[0032] The damper II is a translational structure, which is installed in the return air duct, is driven by a cylinder, and slides up and down along the guide rail to open the passage between the return air duct and the lower air duct/up air duct and connect it with the upper air duct/downwind The passage between the roads is closed, and the return air direction is switched through the movement of the damper II.

[0033] The air door I and the air door II are switched according to a preset time, or according to the temperature difference between the upper and lower ends of the workpiece measured by the load thermocouple, so as to realize the alternating cooling of the workpiece by the cooling airflow.

[0034] The upper small heat shield and the lower small heat shield are of translational structure, which are driven by a cylinder, and the cylinder pushes out during the heating process, pushing the upper and lower heat shields to be closed with the outer wall of the furnace bladder , The upper air duct and the lower air duct are closed; the cylinder is retracted during the gas quenching process, and the upper and lower heat shields are pulled to separate the outer wall of the furnace bladder, and the upper air duct and the lower air duct are opened to provide a large-section cooling channel for the cooling airflow .

[0035] The heat exchanger is a tube-fin heat exchanger, which is installed inside the closed shell outside the furnace body and connected in series in the return air pipeline for cooling the gas after heat exchange.

[0036] In the air-cooling system for horizontal vacuum high-pressure gas quenching of the present invention, the heat exchanger is installed inside the closed shell outside the furnace body and connected in series in the return air pipeline; the upper small heat shield and the lower small heat shield It is a translational structure, driven by a cylinder, closed when heating, and opened when cooling; the air door I and the air door II are installed in the air inlet and return channels, respectively, are a translation structure, driven by the air cylinder. Through the movement of the air door I and the air door II, the air inlet duct can be connected with the upper/lower air duct, and the return air duct can be connected with the lower/upper air duct, thereby realizing the switching of the cooling air flow direction during the gas quenching process. It helps to improve the cooling uniformity of the gas quenching process, thereby improving the uniformity of the structure and performance of the workpiece, and reducing the deformation of the workpiece.

[0037] Specific embodiment:

[0038] figure 1 The heating process is shown. At this time, the driving cylinders of the upper small heat shield 8 and the lower small heat shield 14 are in the ejected state, and the ventilation holes on the upper and lower sides of the furnace bladder are closed. When heating in this case, since a closed shell is formed in the furnace, it has a good heat preservation and heat insulation effect.

[0039] figure 2 with image 3 Shown is the cooling process. In this process, first fill the furnace with high pressure gas and start the fan.

[0040] figure 2 Shown is a schematic diagram of airflow cooling from top to bottom. In the figure, the driving cylinders of the upper small heat shield 8, the lower small heat shield 14, and the damper II9 are in the retracted state, and the damper I6 driving cylinder is in the ejected state. At this time, the upper small heat shield 8 and the lower small heat shield 14 are separated from the furnace liner, and the ventilation holes on the upper and lower sides of the furnace liner are opened; the air door I6 in the air inlet duct 5 is at the lower end, making the air inlet duct 5 and the upper air duct 7 The passage between the air inlet duct 5 and the lower air duct 13 is closed; the damper II9 in the return air duct 10 is at the upper end, so that the passage between the return air duct 10 and the upper air duct 7 is closed, and the return duct 10 and the lower air duct are closed. The passage between 13 is open. When cooling in this state, the airflow flows out from the outlet of the volute 3, passes through the air inlet pipe 4, the air inlet duct 5, and the upper air duct 7, and blows through the workpiece inside the furnace from top to bottom, and performs forced heat exchange with the workpiece. The heated gas enters the return air duct 12 through the down air duct 13 and the return air duct 10. After the gas is cooled by the heat exchanger 11, it returns to the inlet of the volute 3 through the return air duct 12 to form a top-down cooling airflow. Close the loop.

[0041] image 3 Shown is a schematic diagram of airflow cooling from bottom to top. In the figure, the upper small heat shield 8, the lower small heat shield 14, and the driving cylinder of the damper I6 are in the retracted state, and the driving cylinder of the damper II9 is ​​in the ejected state. At this time, the upper small heat shield 8 and the lower small heat shield 14 are separated from the furnace shell, and the ventilation holes on the upper and lower sides of the furnace are opened; the damper I6 in the air inlet duct 5 is at the upper end, making the air inlet duct 5 and the upper air duct The passage between 7 is closed, and the passage between the inlet duct 5 and the lower air duct 13 is opened; the damper II9 in the return air duct 10 is at the lower end, so that the passage between the return duct 10 and the upper air duct 7 is opened, and the return duct 10 and the downwind The passage between road 13 is closed. When cooling in this state, the airflow flows out of the outlet of the volute 3, passes through the air inlet pipe 4, the air inlet duct 5, and the lower air duct 13, and blows through the workpiece inside the furnace from bottom to top, and performs forced heat exchange with the workpiece. The heated gas enters the return air duct 12 through the upper air duct 7 and the return air duct 10. After the gas is cooled by the heat exchanger 11, it returns to the inlet of the volute 3 through the return air duct 12 to form a bottom-up cooling airflow. Close the loop.

[0042] During the cooling process, by switching the air door I6 and the air door II9, the cooling air flow can alternately cool the workpiece from top to bottom and from bottom to top. The air door I6 and the air door II9 can be switched according to the preset time, or according to the temperature difference between the upper and lower ends of the workpiece measured by the load thermocouple. Through the cyclic reciprocation of the above process, the cooling uniformity of the workpiece in the gas quenching process is greatly improved.