Cooling device for vacuum furnace

Abstract

The utility model belongs to the technical field of vacuum furnaces, and discloses a cooling device for a vacuum furnace, which comprises a furnace body connected with a furnace cover, supporting legs and a water cooling jacket, the water cooling jacket is connected with a water inlet pipe and a water outlet pipe, the water outlet pipe is connected with a filter, the filter is connected with a circulating water pipe, and the circulating water pipe is connected with a cooling-water machine. The furnace body is provided with a ventilation cavity, the furnace body is connected with an air inlet pipe and an air outlet pipe, the air inlet pipe is connected with an air blower, the air outlet pipe is connected with a heat exchanger, and the exhaust end of the heat exchanger is connected with a second communication pipe; the second communicating pipe is connected with the air inlet end of the air blower, the furnace body is connected with an air pipeline, the air pipeline is connected with an air outlet nozzle, and the air pipeline and the air outlet nozzle are both made of high-temperature-resistant materials. Heat in the furnace body can be taken away from different directions and ways, and the cooling speed is increased.

Description

Technical Field

[0001] This utility model relates to the field of vacuum furnace technology, and in particular to a cooling device for a vacuum furnace. Background Technology

[0002] A vacuum furnace is an industrial furnace that utilizes a vacuum system to achieve a certain degree of vacuum by keeping the pressure in the furnace chamber below one standard atmosphere. Because the furnace chamber can provide a vacuum environment, vacuum furnaces offer advantages such as being free of impurities, pollution, and energy consumption, and allowing for easy temperature control. They are connected to a high-vacuum pump system via pipes within a furnace chamber sealed by a metal casing or quartz glass cover.

[0003] A search of Chinese utility model patent (publication number CN219572689U) reveals a high-temperature vacuum furnace with a water-cooling structure, including a high-temperature furnace outer cylinder, a cooling water inlet, an inlet valve, a cooling water outlet, a high-temperature furnace inner cylinder, a cooling layer, a feed inlet, a flange connecting ring, and a discharge outlet. This allows for water cooling of the high-temperature furnace interior, resulting in better cooling performance and saving time.

[0004] However, practical application has revealed that this technical solution still has at least the following drawbacks:

[0005] The cooling layer is located outside the vacuum furnace. As heat is transferred from the center of the workpiece outwards within the furnace, a significant temperature gradient occurs. The workpiece near the inner wall cools rapidly, while the central area cools much slower. In the vacuum quenching process, this temperature gradient leads to uneven thermal stress within the workpiece. The portion near the inner wall experiences greater structural transformation stress due to rapid cooling, while the central region, due to slower cooling, suffers from delayed structural transformation. This can cause defects such as deformation and cracking, preventing the workpiece from achieving the expected hardness and toughness requirements. Utility Model Content

[0006] The present invention aims to provide a cooling device for a vacuum furnace to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A cooling device for a vacuum furnace includes a furnace body, a furnace cover connected to the furnace body, support legs connected to the furnace body, a water-cooling jacket connected to the furnace body, an inlet pipe and an outlet pipe connected to the water-cooling jacket, a filter connected to the outlet pipe, a circulating water pipe connected to the filter, a chiller connected to the circulating water pipe, a first connecting pipe connected to the outlet end of the chiller, a water pump connected to the first connecting pipe, the outlet end of the water pump connected to the inlet pipe, a ventilation cavity opened in the furnace body, an air inlet pipe and an air outlet pipe connected to the furnace body, a blower connected to the air inlet pipe, a heat exchanger connected to the outlet end of the heat exchanger, a second connecting pipe connected to the exhaust end of the heat exchanger, the second connecting pipe connected to the air inlet end of the blower, an air duct connected to the furnace body, and an air nozzle connected to the air duct, both the air duct and the air nozzle being made of high-temperature resistant material.

[0009] Preferably, the filter is connected to two sets of first flanges at both ends, and the outlet pipe and the circulating water pipe are connected to second flanges and third flanges respectively, with the two sets of first flanges connected to the second flanges and the third flanges respectively.

[0010] Preferably, the water-cooled jacket is connected to several sets of baffles, which are arranged alternately, and the baffles are connected to the furnace body.

[0011] Preferably, the furnace cover is connected to a temperature sensor.

[0012] Preferably, the furnace cover is connected to a heat insulation layer.

[0013] The beneficial effects of this technical solution compared to existing technologies are as follows:

[0014] (1) This technical solution enables air cooling inside the furnace body by setting up a blower, ventilation cavity, air duct, and air outlet, allowing air cooling to be carried out simultaneously with water cooling outside the furnace body. This allows heat to be removed from different directions and through different pathways, improving the cooling rate. Water cooling mainly acts on the outside of the furnace body, quickly absorbing and removing heat from the furnace surface; while air cooling acts directly on the inside of the furnace body, cooling the high-temperature areas inside. This helps to achieve a more uniform cooling effect, further balancing the temperature difference. Uniform cooling can reduce the thermal stress on the workpieces inside the vacuum furnace caused by the temperature gradient, preventing deformation or cracking of the workpieces due to excessive differences in cooling rates between the inside and outside. The synergistic effect of air cooling and water cooling can better control the temperature change of the furnace body, reduce the impact of thermal expansion on the internal structural precision of the equipment, thereby ensuring that the equipment can maintain good performance when processing precision workpieces and improving product quality. Different vacuum furnace processes have different requirements for cooling rate and temperature uniformity. The simultaneous implementation of air cooling and water cooling can flexibly adjust the cooling method according to the specific process.

[0015] (2) By setting the first flange, second flange and third flange, the filter can be disassembled and replaced. Maintenance personnel can quickly remove the clogged filter and replace it with a new one, shortening maintenance time. By replacing the clogged filter in a timely manner, it can be ensured that the cooling water can circulate in the cooling system at a normal flow rate and speed, ensuring that the furnace temperature is effectively controlled and avoiding overheating of the equipment due to insufficient cooling, thereby maintaining the stable operation of the vacuum furnace.

[0016] (3) By setting baffles, the path of cooling water can be changed, the flow path of cooling water becomes longer, the contact time with the furnace body increases, thereby removing more heat and improving cooling efficiency.

[0017] (4) By setting a temperature sensor, the temperature change inside the furnace can be sensed in real time, so the flow rate of the cooling medium can be adjusted according to actual needs.

[0018] (5) By setting up an insulation layer, heat transfer can be effectively blocked, reducing the surface temperature of the furnace cover to a range that is tolerable to the human body, reducing the risk of burns to staff and ensuring the safety of personnel. Attached Figure Description

[0019] Figure 1 This is a frontal sectional view of the present invention;

[0020] Reference numerals in the attached drawings: 1. Furnace body; 2. Water-cooled jacket; 3. Insulation layer; 4. Temperature sensor; 5. Furnace cover; 6. Water outlet pipe; 7. Second flange; 8. First flange; 9. Filter; 10. Third flange; 11. Circulating water pipe; 12. Chiller; 13. First connecting pipe; 14. Water pump; 15. Inlet pipe; 16. Outlet pipe; 17. Heat exchanger; 18. Second connecting pipe; 19. Blower; 20. Air inlet pipe; 21. Ventilation cavity; 22. Support leg; 23. Air outlet nozzle; 24. Air duct; 25. Baffle plate. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0022] like Figure 1The cooling device for a vacuum furnace shown includes a furnace body 1, a furnace cover 5 detachably connected to the top of the furnace body 1, support legs 22 connected to the bottom of the furnace body 1, a water-cooled jacket 2 connected to the outer wall of the furnace body 1, an inlet pipe 15 connected to the lower side wall of the water-cooled jacket 2, an outlet pipe 6 connected to the upper side wall of the water-cooled jacket 2, a second flange 7 connected to the other end of the outlet pipe 6, a filter 9 with first flanges 8 connected to both ends, a third flange 10 at one end of a circulating water pipe 11, two sets of first flanges 8 connected to the second flange 7 and the third flange 10 respectively by bolts, a chiller connected to the other end of the circulating water pipe 11, a first connecting pipe 13 connected to the outlet of the chiller, the first connecting pipe 13 connected to the inlet of a water pump 14, and the outlet of the water pump 14 connected to the inlet pipe 15. The water-cooled jacket 2 is connected to several sets of baffles 25, which are staggered and fitted around the furnace body 1 and fixedly connected to the outer wall of the furnace body 1. Cooling water enters the water pump 14 from the chiller through the first connecting pipe 13, and is then pumped into the water-cooled jacket 2 through the inlet pipe 15. The cooling water flows through a channel composed of several sets of staggered baffles 25, fully contacting the outer wall of the furnace body 1 for heat exchange. After heat exchange, the cooled water, now at a higher temperature, is discharged from the water-cooled jacket 2 through the outlet pipe 6. It then flows through the filter 9, which removes impurities carried away from the water-cooled jacket 2, preventing them from entering the chiller and affecting its operation. The cooled water after heat exchange enters the chiller through the circulating water pipe 11, is cooled by the chiller, and then re-enters the water-cooled jacket 2 for heat exchange, forming a cooling water circulation.

[0023] like Figure 1 As shown, a ventilation cavity 21 is provided on the bottom wall of the furnace body 1. An air inlet pipe 20 and an air outlet pipe 16 are connected to the bottom wall of the furnace body 1. Both the air inlet pipe 20 and the air outlet pipe 16 are equipped with valves. One end of the air inlet pipe 20 is connected to the ventilation cavity 21, and the other end of the air inlet pipe 20 is connected to a blower 19. The other end of the air outlet pipe 16 is connected to a heat exchanger 17. The exhaust end of the heat exchanger 17 is connected to a second connecting pipe 18, which is connected to the air inlet end of the blower 19. An air duct 24 is connected to the upper surface of the bottom wall of the furnace body 1. Four sets of air ducts 24 are arranged in a circular array. All four sets of air ducts 24 are connected to the ventilation cavity 21. Several sets of air outlets 23 are connected to the air ducts 24. The several sets of air outlets 23 are arranged in parallel. Both the air ducts 24 and the air outlets 23 are made of high-temperature resistant materials. The high-temperature gas inside the furnace body 1 enters the heat exchanger 17 through the gas outlet pipe 16, where it exchanges heat with the cooling medium inside the heat exchanger 17. The cooled gas then enters the blower 19 through the second connecting pipe 18, is discharged by the blower 19, enters the ventilation chamber 21 through the air inlet pipe 20, enters the air duct 24 through the ventilation chamber 21, and then enters the furnace body 1 through the air outlet 23, cooling the interior of the furnace body 1 and forming a gas circulation.

[0024] Two sets of temperature sensors 4 are connected to the center and edge of the bottom wall of the furnace cover 5, respectively. These two sets of temperature sensors 4 determine the temperature at the edge and center of the furnace body 1, thereby adjusting the power of the water pump 14 and the blower 19 to control the furnace temperature. A heat insulation layer 3 is connected to the top and side walls of the furnace cover 5.

[0025] The specific implementation process is as follows:

[0026] In operation, open the furnace cover 5, place the workpiece to be processed into the furnace body 1, and then heat it. For cooling, start the chiller and water pump 14 to circulate cooling water through the water-cooled jacket 2. Open the valves of the exhaust pipe 16 and the inlet pipe 20, and start the blower 19 to draw the gas inside the furnace body 1 into the heat exchanger 17 for cooling. Then, discharge the cooled gas back into the furnace body 1 to further cool it. Observe the signal transmitted by the temperature sensor 4 and control the cooling rate inside the furnace body 1 by adjusting the power of the water pump 14 and the blower 19.

[0027] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A cooling device for a vacuum furnace, characterized in that: The system includes a furnace body (1), a furnace cover (5) connected to the furnace body (1), support legs (22) connected to the furnace body (1), a water-cooling jacket (2) connected to the furnace body (1), an inlet pipe (15) and an outlet pipe (6) connected to the water-cooling jacket (2), a filter (9) connected to the outlet pipe (6), a circulating water pipe (11) connected to the filter (9), a chiller (12) connected to the circulating water pipe (11), a first connecting pipe (13) connected to the outlet of the chiller (12), a water pump (14) connected to the first connecting pipe (13), and the outlet of the water pump (14) connected to the inlet pipe. (15) Connection, the furnace body (1) is provided with a ventilation cavity (21), the furnace body (1) is connected with an air inlet pipe (20) and an air outlet pipe (16), the air inlet pipe (20) is connected with a blower (19), the air outlet pipe (16) is connected with a heat exchanger (17), the exhaust end of the heat exchanger (17) is connected with a second connecting pipe (18), the second connecting pipe (18) is connected with the air inlet end of the blower (19), the furnace body (1) is connected with an air duct (24), the air duct (24) is connected with an air nozzle (23), the air duct (24) and the air nozzle (23) are both made of high temperature resistant material.

2. The cooling device for a vacuum furnace as described in claim 1, characterized in that: The filter (9) is connected to two sets of first flanges (8) at both ends. The outlet pipe (6) and the circulating water pipe (11) are connected to the second flange (7) and the third flange (10) respectively. The two sets of first flanges (8) are connected to the second flange (7) and the third flange (10) respectively.

3. The cooling device for a vacuum furnace as described in claim 1, characterized in that: The water-cooled jacket (2) is connected to several sets of baffles (25), which are arranged alternately and are connected to the furnace body (1).

4. The cooling device for a vacuum furnace as described in claim 1, characterized in that: The furnace cover (5) is connected to a temperature sensor (4).

5. A cooling device for a vacuum furnace as described in claim 1, characterized in that: The furnace cover (5) is connected to a heat insulation layer (3).

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