Rapid cooling device for vacuum furnace

Abstract

The utility model relates to the technical field of vacuum furnaces, and particularly discloses a rapid cooling device for a vacuum furnace, which comprises a vacuum furnace body, a cooling cavity, a spiral cooling pipe, a cold liquid device and a cold air device, the cooling cavity is embedded in the inner wall of the vacuum furnace body, and the spiral cooling pipe is arranged in the cooling cavity; a spiral guide plate is arranged in the spiral cooling pipe in the axial direction and divides the spiral cooling pipe into a cold liquid medium channel and a cold air medium channel. The cold liquid device is communicated with the cold liquid medium channel through a pipeline and is used for circularly cooling a liquid medium; the cold air device is communicated with the cold air medium channel through a pipeline and is used for conveying a flowing gas medium into the cold air medium channel; a spiral guide plate is arranged in a spiral cooling pipe in the axial direction, and the spiral guide plate divides the spiral cooling pipe into a cold liquid medium channel and a cold air medium channel; rapid heat absorption of liquid and forced convection of gas are achieved, and the cooling speed is increased.

Description

Technical Field

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

[0002] A vacuum furnace is a furnace cavity that uses a vacuum system (composed of carefully assembled components such as vacuum pumps, vacuum measuring devices, and vacuum valves) to remove some of the material inside the furnace cavity, so that the pressure inside the furnace cavity is less than one standard atmosphere, thereby achieving a vacuum state inside the furnace cavity.

[0003] In vacuum heat treatment processes, the rapid cooling stage directly affects the microstructure and properties of the workpiece and production efficiency. Traditional vacuum furnace cooling technology has the following significant drawbacks:

[0004] Current solutions mostly use a single cooling medium (pure air cooling or pure liquid cooling): gas cooling is slow, while liquid cooling is prone to thermal stress cracks on the workpiece surface due to sudden cooling, making it difficult to balance efficiency and safety; cooling pipelines mostly adopt a straight or low helix angle design, with short medium flow paths and a high proportion of laminar flow, resulting in insufficient utilization of effective heat exchange area.

[0005] Therefore, there is an urgent need in this field for a rapid cooling device for vacuum furnaces that can achieve gas-liquid synergistic cooling, enhance heat exchange efficiency, reduce energy consumption, and have dynamic temperature control capabilities. Utility Model Content

[0006] This invention proposes a rapid cooling device for a vacuum furnace. Through gas-liquid dual-medium synergistic cooling and spiral guide plate enhanced heat exchange design, combined with a real-time dynamic temperature control system, it achieves high-speed and uniform cooling of the vacuum furnace while reducing energy consumption and medium loss, and has the advantages of high efficiency, energy saving and precise temperature control.

[0007] This invention is implemented as follows: a rapid cooling device for a vacuum furnace includes a vacuum furnace body, a cooling chamber, a spiral cooling pipe, a cold liquid device, and a cold gas device. The cooling chamber is embedded in the inner wall of the vacuum furnace body, and the spiral cooling pipe is disposed within the cooling chamber. A spiral guide plate is provided axially inside the spiral cooling pipe, dividing it into a cold liquid medium channel and a cold gas medium channel. The cold liquid device is connected to the cold liquid medium channel via a pipeline for circulating and cooling the liquid medium. The cold gas device is connected to the cold gas medium channel via a pipeline for supplying flowing gas medium into the cold gas medium channel.

[0008] As a preferred embodiment of the rapid cooling device for a vacuum furnace according to this utility model, the spiral guide plate has a spiral angle of 20°-45° and the cross-section of the spiral guide plate has a continuous wave-shaped or sawtooth structure.

[0009] As a preferred embodiment of the rapid cooling device for a vacuum furnace according to this utility model, the cooling liquid device includes a storage tank, a circulating pump, and a heat exchanger. The outlet of the storage tank is directly connected to the inlet of the circulating pump via a first liquid pipeline, and the outlet of the circulating pump is connected to the inlet of the cooling liquid medium channel. The outlet of the circulating pump is connected to the inlet of the cooling liquid medium channel via a second liquid pipeline. The outlet of the cooling liquid medium channel is connected to the hot-side inlet of the heat exchanger via a third liquid pipeline. The hot-side outlet of the heat exchanger returns to the top return port of the storage tank via a fourth pipeline, forming a closed-loop circulation. A shut-off valve is provided on the first liquid pipeline to control the on / off state and flow rate of the cooling liquid medium. A one-way valve is provided on the second liquid pipeline near the inlet of the cooling liquid medium channel to prevent backflow of the medium. The cold-side inlet of the heat exchanger is connected to a cooling water supply pipeline, and the cold-side outlet is connected to a cooling water discharge pipeline, for secondary cooling of the cooled liquid medium after heat absorption by external cooling water.

[0010] As a preferred embodiment of the rapid cooling device for a vacuum furnace according to this utility model, the cooling device includes a compressed gas source, a gas cooler, a flow regulating valve, and an external discharge pipeline. The outlet of the compressed gas source is connected to the inlet of the gas cooler through a first gas pipeline; the outlet of the gas cooler is connected to the inlet of the cooling gas medium channel through a second gas pipeline; the outlet of the cooling gas medium channel is connected to the inlet of the flow regulating valve through a third gas pipeline, and the outlet of the flow regulating valve is directly connected to the external discharge pipeline for discharging the heat-absorbing gas medium to the external environment or an independent waste gas treatment system; a pressure regulating valve is provided on the first gas pipeline for controlling the output gas pressure; a first temperature sensor is provided on the second gas pipeline for monitoring the gas temperature entering the cooling gas medium channel; and a silencer and a filter are provided in the external discharge pipeline for reducing exhaust noise and filtering impurities.

[0011] As a preferred embodiment of the rapid cooling device for a vacuum furnace according to this utility model, the inner wall of the furnace chamber of the vacuum furnace body is provided with a second temperature sensor. The second temperature sensor is connected to the control system signal of the cooling liquid device and the cooling gas device, and is used to dynamically adjust the flow rate and temperature of the cooling medium according to the temperature inside the furnace.

[0012] As a preferred embodiment of the rapid cooling device for a vacuum furnace according to this utility model, the spiral cooling tube is made of copper alloy or stainless steel, and a thermally conductive silicone grease layer is filled between the outer wall of the spiral cooling tube and the inner wall of the cooling chamber.

[0013] The beneficial effects of this utility model are:

[0014] 1. By providing a spiral guide plate along the axial direction inside the spiral cooling tube, the spiral guide plate divides the spiral cooling tube into a cool liquid medium channel and a cool gas medium channel; thus realizing rapid heat absorption of the liquid and forced convection of the gas, the cooling speed is improved.

[0015] 2. The spiral guide plate and the corrugated cross-section mechanism extend the flow path of the medium, while the corrugated cross-section mechanism increases the turbulence intensity, significantly improves the heat exchange efficiency, reduces flow resistance, and reduces pressure loss.

[0016] 3. The cooling medium is recycled, reducing the need for frequent replacement of the cooling medium. At the same time, the flow rate and temperature of the cooling medium are dynamically adjusted, reducing the dependence on high-power refrigeration equipment. The temperature sensor provides real-time feedback on the furnace temperature, enabling dynamic adjustment of the flow rate and temperature of the cooling medium and improving temperature control accuracy. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the flow regulating valve and external discharge pipeline of this utility model.

[0020] Figure 3 This is a cross-sectional view of the spiral cooling pipe of this utility model.

[0021] Figure 4 This is a schematic diagram of the spiral guide plate of this utility model.

[0022] The markings in the diagram are as follows: 1. Vacuum furnace body; 2. Cooling chamber; 3. Spiral cooling pipe; 4. Spiral guide plate; 5. Cooling liquid medium channel; 6. Cooling gas medium channel; 7. Storage tank; 8. Circulating pump; 9. Heat exchanger; 10. Shut-off valve; 11. Check valve; 12. Cooling water supply pipeline; 13. Cooling water discharge pipeline; 14. Compressed air source; 15. Gas cooler; 16. Flow regulating valve; 17. External discharge pipeline; 18. Pressure regulating valve; 19. First temperature sensor; 20. Silencer; 21. Filter device; 22. Second temperature sensor; 23. Thermal grease layer. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0024] Please see Figure 1-4A rapid cooling device for a vacuum furnace includes a vacuum furnace body 1, a cooling chamber 2, a spiral cooling pipe 3, a cold liquid device, and a cold gas device. The cooling chamber 2 is embedded in the inner wall of the vacuum furnace body 1, and the spiral cooling pipe 3 is disposed within the cooling chamber 2. A spiral guide plate 4 is provided axially inside the spiral cooling pipe 3, which divides the spiral cooling pipe 3 into a cold liquid medium channel 5 and a cold gas medium channel 6. The cold liquid device is connected to the cold liquid medium channel 5 through a pipeline for circulating and cooling the liquid medium. The cold gas device is connected to the cold gas medium channel 6 through a pipeline for supplying flowing gas medium into the cold gas medium channel 6.

[0025] In this embodiment: the rapid cooling device for the vacuum furnace utilizes a cooling chamber 2 embedded in the inner wall of the vacuum furnace body 1, with a spiral cooling pipe 3 installed within the cooling chamber 2. The spiral cooling pipe 3 is divided into a liquid cooling medium channel 5 and a gas cooling medium channel 6 by a spiral guide plate 4. The spiral guide plate 4 extends the flow path of the medium, increases the turbulence intensity, and significantly improves the heat exchange efficiency. The liquid cooling device circulates the liquid cooling medium in the liquid cooling medium channel 5, while the gas cooling device delivers flowing gas medium to the gas cooling medium channel 6. Through the joint heat exchange of the liquid and gas cooling media, rapid cooling of the vacuum furnace is achieved. Simultaneously, a second temperature sensor 22 monitors the furnace temperature in real time and feeds the signal back to the control systems of the liquid cooling device and the gas cooling device to dynamically adjust the flow rate and temperature of the cooling medium.

[0026] As a technical optimization of this utility model, the spiral guide plate 4 has a spiral angle of 20°-45°, and the cross-section of the spiral guide plate 4 has a continuous wave-shaped or sawtooth structure.

[0027] In this embodiment, the spiral guide plate 4 has a spiral angle and a wavy cross section to enhance turbulent heat transfer and reduce pressure loss.

[0028] As an optimized technical solution of this utility model, the cold liquid device includes a storage tank 7, a circulating pump 8, and a heat exchanger 9. The outlet of the storage tank 7 is directly connected to the inlet of the circulating pump 8 through a first liquid pipeline, and the outlet of the circulating pump 8 is connected to the inlet of the cold liquid medium channel 5. The outlet of the circulating pump 8 is connected to the inlet of the cold liquid medium channel 5 through a second liquid pipeline. The outlet of the cold liquid medium channel 5 is connected to the hot side inlet of the heat exchanger 9 through a third liquid pipeline. The hot side outlet of the heat exchanger 9 returns to the top return port of the storage tank 7 through a fourth pipeline, forming a closed loop. A shut-off valve 10 is provided on the first liquid pipeline to control the on / off of the cold liquid medium and regulate its flow. A one-way valve 11 is provided on the second liquid pipeline near the inlet of the cold liquid medium channel 5 to prevent backflow of the medium. The cold side inlet of the heat exchanger 9 is connected to a cooling water supply pipeline 12, and the cold side outlet is connected to a cooling water discharge pipeline 13, for secondary cooling of the heat-absorbing cold liquid medium by external cooling water.

[0029] In this embodiment: the circulating pump 8 provides the power for the flow of the cold liquid medium, ensuring that the medium maintains a set flow rate in the channel; the heat exchanger 9 performs heat exchange on the high-temperature cold liquid medium after heat absorption, and reduces its temperature to the initial set value through cooling water or refrigerant; the storage tank 7 stores and stabilizes the temperature and pressure of the cold liquid medium, and an exhaust valve can be installed on the top to remove air bubbles generated during circulation; a temperature regulating valve is installed on the cooling water supply pipeline 12 to adjust the cooling water flow rate according to the temperature feedback of the cold liquid medium; the shut-off valve 10 and the check valve 11 prevent backflow of the medium during shutdown, which could damage the pump body; the first temperature sensor 19 is installed on the third pipeline to monitor the outlet temperature of the cold liquid medium in real time and is linked to the cooling water supply of the heat exchanger 9 for control; the cold liquid medium is continuously transported to the cold liquid medium channel 5 through forced circulation, absorbs heat from the furnace, is cooled down by the heat exchanger 9, and returns to the storage tank 7 for recycling, ensuring the reliability of the cold liquid circulation; the cold liquid (such as water or oil).

[0030] As a technical optimization of this utility model, the air conditioning device includes a compressed air source 14, a gas cooler 15, a flow regulating valve 16, and an external discharge pipeline 17. The outlet of the compressed air source 14 is connected to the inlet of the gas cooler 15 through a first gas pipeline; the outlet of the gas cooler 15 is connected to the inlet of the air conditioning medium channel 6 through a second gas pipeline; the outlet of the air conditioning medium channel 6 is connected to the inlet of the flow regulating valve 16 through a third gas pipeline, and the outlet of the flow regulating valve 16 is directly connected to the external discharge pipeline 17 for discharging the heat-absorbing gas medium to the external environment or an independent waste gas treatment system; a pressure regulating valve 18 is provided on the first gas pipeline for controlling the output gas pressure; a first temperature sensor 19 is provided on the second gas pipeline for monitoring the gas temperature entering the air conditioning medium channel 6; a silencer 20 and a filter device 21 are provided in the external discharge pipeline 17 for reducing exhaust noise and filtering impurities.

[0031] In this embodiment: the compressed gas source 14 provides high-pressure gas (such as nitrogen or air), and the output pressure is adjustable to ensure that the gas flows at high speed in the cold gas medium channel 6; the gas cooler 15 precools the high-temperature compressed gas (for example, by using a plate heat exchanger) to reduce the initial temperature of the gas (such as below the ambient temperature) and improve the heat absorption capacity; the flow regulating valve 16 adjusts the gas flow rate at the outlet of the cold gas medium channel 6 according to the temperature or pressure feedback in the furnace, and dynamically controls the cooling intensity; the high-pressure gas is used to force convection to absorb heat in the furnace, the precooled gas enhances the heat absorption efficiency, and the gas is directly discharged after cooling; the gas provided by the compressed gas source 14 flows to the gas cooler 15, the cold gas medium channel 6, and the flow regulating valve 16, and is finally discharged to the external environment or an independent waste gas treatment system through the external discharge pipeline 17, while the cold gas flows at high speed in the cold gas medium channel 6, and heat dissipation is assisted by convection and radiation, ensuring the rationality of cold gas supply and discharge;

[0032] The compressed air source 14 is a screw air compressor; the shell of the silencer 20 is made of 316L stainless steel and lined with a ceramic fiber heat insulation layer (the specific structure of the silencer 20 and the filter device 21 is not shown in the figure). The silencer 20 is equipped with a sintered metal filter screen at the inlet end, which has both noise reduction and pre-filtration functions; the filter device 21 includes three-stage filtration: coalescing filter element, precision filter element, and activated carbon layer.

[0033] As a technical optimization of this utility model, the inner wall of the furnace chamber of the vacuum furnace body 1 is provided with a second temperature sensor 22. The second temperature sensor 22 is connected to the control system signal of the cooling liquid device and the cooling gas device, and is used to dynamically adjust the flow rate and temperature of the cooling medium according to the temperature inside the furnace.

[0034] In this embodiment, the second temperature sensor 22 is installed on the inner wall of the furnace chamber of the vacuum furnace body 1 to monitor the furnace temperature in real time and feed the signal back to the control system of the cooling liquid device and the cooling gas device, thereby realizing real-time monitoring of the furnace temperature and dynamic adjustment of the flow rate and temperature of the cooling medium, and improving the temperature control accuracy.

[0035] As a technical optimization of this utility model, the spiral cooling pipe 3 is made of copper alloy or stainless steel, and a thermally conductive silicone grease layer 23 is filled between the outer wall of the spiral cooling pipe 3 and the inner wall of the cooling cavity 2.

[0036] In this embodiment, copper alloy / stainless steel materials and thermal grease are used to improve thermal conductivity and prevent structural deformation caused by thermal expansion.

[0037] Working principle and usage process of this utility model:

[0038] The cooling liquid device and the cooling gas device are turned on. In the cooling liquid device, the cooling liquid medium in the storage tank 7 flows into the circulation pump 8 through the first liquid pipeline, and the circulation pump 8 delivers it to the inlet of the cooling liquid medium channel 5. In the cooling gas device, the gas from the compressed gas source 14 enters the gas cooler 15 through the first gas pipeline, is cooled, and then is delivered to the inlet of the cooling gas medium channel 6 through the second gas pipeline. The cooling liquid medium flows in the cooling liquid medium channel 5, and the flowing gas medium flows in the cooling gas medium channel 6. The two media exchange heat with the heat in the vacuum furnace body 1 through the spiral cooling pipe 3, absorbing heat. After heat exchange, the cooling liquid medium enters the hot side of the heat exchanger 9 through the third liquid pipeline, is cooled in the heat exchanger 9, and then flows back to the storage tank through the fourth pipeline. Liquid tank 7; the gaseous medium after heat exchange enters the flow regulating valve 16 through the third gas pipeline, and is discharged to the external environment or independent waste gas treatment system through the external discharge pipeline 17; the second temperature sensor 22 monitors the temperature inside the vacuum furnace body 1 in real time and feeds back the temperature signal to the control system of the cooling liquid device and the cooling gas device; the control system dynamically adjusts the flow rate and temperature of the cooling medium according to the temperature inside the furnace. If the temperature inside the furnace is too high, the flow rate of the cooling medium is increased or the temperature of the cooling medium is decreased; if the temperature inside the furnace is too low, the flow rate of the cooling medium is decreased or the temperature of the cooling medium is increased; the cooling liquid device and the cooling gas device work continuously, and the cooling medium circulates continuously until the temperature inside the vacuum furnace body 1 reaches the set value, completing the cooling process.

[0039] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A rapid cooling device for a vacuum furnace, characterized by: The application relates to a vacuum furnace, which comprises a vacuum furnace body (1), a cooling cavity (2), a spiral cooling pipe (3), a cold liquid device and a cold gas device; the cooling cavity (2) is embedded in the inner wall of the vacuum furnace body (1), and the spiral cooling pipe (3) is arranged in the cooling cavity (2); a spiral guide plate (4) is arranged in the spiral cooling pipe (3) in the axial direction; the spiral guide plate (4) divides the spiral cooling pipe (3) into a cold liquid medium channel (5) and a cold gas medium channel (6); the cold liquid device is connected with the cold liquid medium channel (5) through a pipeline and is used for circulating a cooling liquid medium; and the cold gas device is connected with the cold gas medium channel (6) through a pipeline and is used for conveying flowing gas medium into the cold gas medium channel (6).

2. The rapid cooling device for a vacuum furnace according to claim 1, characterized by: The spiral angle of the spiral guide plate (4) is 20-45 degrees, and the cross section of the spiral guide plate (4) is in a continuous wave shape or a sawtooth shape.

3. The rapid cooling device for a vacuum furnace according to claim 1, characterized by: The cold liquid device comprises a liquid storage tank (7), a circulating pump (8) and a heat exchanger (9); the outlet of the liquid storage tank (7) is directly connected with the inlet of the circulating pump (8) through a first liquid pipeline; the outlet of the circulating pump (8) is connected with the inlet of the cold liquid medium channel (5); the outlet of the circulating pump (8) is connected with the inlet of the cold liquid medium channel (5) through a second liquid pipeline; the outlet of the cold liquid medium channel (5) is connected with the hot side inlet of the heat exchanger (9) through a third liquid pipeline; the hot side outlet of the heat exchanger (9) returns to the top backflow port of the liquid storage tank (7) through a fourth pipeline, thereby forming a closed loop circulation; a stop valve (10) is arranged on the first liquid pipeline and is used for controlling the on-off and flow regulation of the cold liquid medium; a one-way valve (11) is arranged on the second liquid pipeline close to the inlet of the cold liquid medium channel (5) and is used for preventing medium backflow; the cold side inlet of the heat exchanger (9) is connected with a cooling water supply pipeline (12), and the cold side outlet is connected with a cooling water discharge pipeline (13), so that the cold liquid medium after heat absorption is secondarily cooled by external cooling water.

4. The rapid cooling device for a vacuum furnace according to claim 1, characterized by: The cold gas device comprises a compressed gas source (14), a gas cooler (15), a flow regulating valve (16) and an external discharge pipeline (17); the outlet of the compressed gas source (14) is connected with the inlet of the gas cooler (15) through a first gas pipeline; the outlet of the gas cooler (15) is connected with the inlet of the cold gas medium channel (6) through a second gas pipeline; the outlet of the cold gas medium channel (6) is connected with the inlet of the flow regulating valve (16) through a third gas pipeline; the outlet of the flow regulating valve (16) is directly connected with the external discharge pipeline (17) and is used for discharging the gas medium after heat absorption to the external environment or an independent waste gas treatment system; a pressure regulating valve (18) is arranged on the first gas pipeline and is used for controlling the output gas pressure; a first temperature sensor (19) is arranged on the second gas pipeline and is used for monitoring the gas temperature entering the cold gas medium channel (6); a silencer (20) and a filtering device (21) are arranged in the external discharge pipeline (17) and are used for reducing the exhaust noise and filtering impurities.

5. The rapid cooling device for a vacuum furnace according to claim 1, characterized by: The inner wall of the furnace of the vacuum furnace body (1) is provided with a second temperature sensor (22), which is signal connected with the control system of the cold liquid device and the cold gas device, and is used for dynamically adjusting the flow and temperature of the cooling medium according to the temperature in the furnace.

6. The rapid cooling device for a vacuum furnace according to claim 1, characterized by: The material of the spiral cooling pipe (3) is copper alloy or stainless steel, and a heat-conducting silicone grease layer (23) is filled between the outer wall of the spiral cooling pipe (3) and the inner wall of the cooling cavity (2).

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