A rapid cooling device for a heat treatment furnace

Abstract

The utility model discloses a kind of quick cooling device for heat treatment furnace, specifically related to cooling device field, including rack, fixedly connected on the protection shell of rack, cover plate movably connected on the protection shell, fixedly connected in the heat preservation inner shell of protection shell, heater and fixedly connected in the air supply shell of heat preservation inner shell bottom, exhaust pipe is opened in cover plate, the bottom of heat preservation inner shell is opened with several circumferential arrangement's air jet, air supply pipeline is opened in air supply shell, air supply assembly is installed in air supply shell, flow guide assembly is installed on rack. The utility model is combined with the structure of bottom air supply and flow guide vane, simultaneously using flow guide assembly to drive flow guide vane to reciprocating swing synchronously, concentrated airflow is scattered and redistributed, eliminates the temperature gradient and cooling dead zone of each area in furnace, to significantly improve the quality problem such as deformation, cracking caused by uneven cooling, substantially improve product pass rate.

Description

Technical Field

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

[0002] Cooling devices for heat treatment furnaces are key equipment used to control the furnace temperature. Their core function is to prevent overheating of the equipment through efficient heat dissipation, ensuring the stability and safety of the heat treatment process. Common cooling devices include water cooling systems, air cooling systems, and shell and tube coolers. In addition, cooling devices can also recover waste heat, improve energy utilization, and extend equipment life. They are an indispensable supporting component in industrial heat treatment.

[0003] In the rapid cooling process of traditional pit-type heat treatment furnaces, fixed nozzles surrounding the furnace wall or single-axis fans are typically used for forced air cooling. This simple and crude airflow organization method makes it difficult to form a uniform and controllable flow field in the complex furnace space. In actual operation, the airflow tends to seek the path of least resistance, resulting in excessively high airflow velocities in some areas and "cooling dead zones" that are difficult to reach in other areas. At the same time, high-speed airflow is prone to "short-circuiting," failing to fully exchange heat with the entire furnace space before being quickly lost. This causes workpieces placed in different positions in the furnace to experience drastically different cooling processes. Workpieces located in the main airflow channel or near the nozzles cool rapidly, while workpieces in the central area, corners, or areas with dense material baskets cool slowly. This results in huge differences in cooling rates between different parts of the same batch of workpieces, and even between different workpieces. Ultimately, this leads to asynchronous microstructural transformation, uneven distribution of hardness and mechanical properties, and even uneven cooling can generate huge thermal and structural stresses inside the workpieces, which can easily cause difficult-to-correct warping deformation and even micro-cracks, resulting in a high product scrap rate.

[0004] In summary, in order to achieve uniform and rapid cooling of workpieces in the heat treatment furnace, it is necessary to solve the problems of simple cooling structure, chaotic airflow organization in the furnace, obvious cooling dead zones and airflow short circuits in traditional equipment, which can easily cause workpiece deformation, cracking and low yield. The goal is to enable the cooling device to accurately control the cooling rate and improve the uniformity of cooling. Utility Model Content

[0005] The present invention provides a rapid cooling device for a heat treatment furnace, which aims to solve the following problems: traditional equipment has a simple cooling structure, chaotic airflow organization inside the furnace, obvious cooling dead zones and airflow short circuits, which can easily cause workpiece deformation and cracking, resulting in low yield.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rapid cooling device for a heat treatment furnace, comprising a frame, a protective outer shell fixedly connected to the frame, a cover plate movably connected to the protective outer shell, an insulating inner shell fixedly connected to the protective outer shell, a heater fixedly connected to the insulating inner shell, and an air supply shell fixedly connected to the bottom of the insulating inner shell. An exhaust pipe is provided on the cover plate, and several air jet nozzles arranged in a circular pattern are provided at the bottom of the insulating inner shell. An air supply duct is provided on the air supply shell, and an air supply assembly is installed inside the air supply shell. A flow guiding assembly is installed on the frame, and several flow guiding blades are connected to the power output end of the flow guiding assembly. The flow guiding assembly is used to drive the several flow guiding blades to rotate synchronously.

[0007] In a preferred embodiment, the air supply assembly includes a first motor fixedly connected inside the air supply housing and a fan blade with one end fixedly connected to the output end of the first motor, and the other end of the fan blade rotatably connected to the air supply housing. The first motor is used to drive the fan blade to rotate.

[0008] In a preferred embodiment, the flow guiding assembly includes a drive module mounted on a frame and a transmission module mounted on the drive module. The output end of the transmission module is connected to several flow guiding blades. The drive module is used to drive the transmission module to rotate and drive the several flow guiding blades to rotate synchronously through the transmission module.

[0009] In a preferred embodiment, the drive module includes a second motor fixedly connected to the frame, an active rod fixedly connected at one end to the output end of the second motor, and a first bevel gear fixedly connected to the active rod. The other end of the active rod is fixedly connected to the guide vane. The active rod is rotatably connected to the protective shell and the heat-insulating inner shell. The second motor is used to drive the active rod to rotate.

[0010] In a preferred embodiment, the transmission module includes a second bevel gear rotatably connected between the protective outer shell and the heat-insulating inner shell, a plurality of third bevel gears meshing with the second bevel gear, and a driven rod fixedly connected to the third bevel gear. The second bevel gear and the first bevel gear are meshed together, the driven rod is rotatably connected to the protective outer shell and the heat-insulating inner shell, and the end of the driven rod away from the protective outer shell is fixedly connected to the guide vane.

[0011] In a preferred embodiment, the guide vane is provided with a tapered hole, and a channel control component is installed in the tapered hole. The channel control component is used to control the opening and closing of the tapered hole.

[0012] In a preferred embodiment, the channel control assembly includes a connecting rod with one end fixedly connected to a tapered hole, a shape memory alloy spring with one end fixedly connected to the other end of the connecting rod, and a spherical plug fixedly connected to the other end of the shape memory alloy spring, the spherical plug being slidably connected to the tapered hole.

[0013] In a preferred embodiment, a connector is rotatably connected to the drive rod, and an air supply pipe is fixedly connected between the end of the connector and the end of the driven rod away from the heat-insulating inner shell and the air supply shell. An electric push rod is fixedly connected to the frame, and the output end of the electric push rod is fixedly connected to the cover plate. The electric push rod is used to drive the cover plate to move in a preset direction.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention combines bottom air supply with guide vanes, and uses the guide assembly to drive the guide vanes to reciprocate synchronously, continuously breaking the fixed flow field formed by the bottom nozzles, dispersing and redistributing the concentrated airflow, eliminating temperature gradients and cooling dead zones in different areas of the furnace, ensuring that workpieces in different positions can undergo a completely consistent cooling process, thereby significantly improving quality problems such as deformation and cracking caused by uneven cooling, and greatly improving the product qualification rate.

[0016] 2. This utility model, through an intelligent auxiliary injection system based on shape memory alloy, forms a unique temperature adaptive control mechanism, realizing fully automatic intelligent cooling adjustment. It provides targeted enhanced cooling for blind spots and areas with high thermal inertia that are difficult to cover by traditional airflow. No external commands are required, eliminating the need for wiring, sensors, and external actuators required by traditional control. This not only achieves extreme structural compactness but also completely avoids the failure problems that electronic components are prone to in high-temperature and harsh environments. It ensures the stability and service life of the system under long-term high-temperature conditions, while significantly reducing the maintenance complexity and operating costs of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the thermal insulation inner shell structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the flow guiding component structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the channel control component structure of this utility model.

[0022] Figure 6 This is a schematic diagram of the connector structure of this utility model.

[0023] Figure 7 This is a schematic diagram of the air supply component structure of this utility model.

[0024] The attached diagram is labeled as follows: 1. Frame; 2. Protective outer shell; 3. Cover plate; 301. Exhaust pipe; 4. Insulated inner shell; 401. Air nozzle; 5. Heater; 6. Air supply shell; 601. Air supply duct; 701. First motor; 702. Fan blade; 801. Second motor; 802. Drive rod; 803. First bevel gear; 804. Second bevel gear; 805. Third bevel gear; 806. Driven rod; 9. Guide vane; 901. Conical hole; 1001. Connecting rod; 1002. Memory alloy spring; 1003. Spherical plug; 11. Connector; 12. Air supply pipe; 13. Electric push rod. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Refer to the instruction manual appendix Figures 1 to 7 A rapid cooling device for a heat treatment furnace includes a frame 1, a protective shell 2 fixedly connected to the frame 1, a cover plate 3 movably connected to the protective shell 2, an insulating inner shell 4 fixedly connected to the protective shell 2, a heater 5 fixedly connected to the insulating inner shell 4, and an air supply shell 6 fixedly connected to the bottom of the insulating inner shell 4. An exhaust pipe 301 is provided on the cover plate 3, a plurality of air jet nozzles 401 arranged in a circular pattern are provided at the bottom of the insulating inner shell 4, an air supply duct 601 is provided on the air supply shell 6, an air supply assembly is installed inside the air supply shell 6, a flow guide assembly is installed on the frame 1, and a plurality of flow guide blades 9 are connected to the power output end of the flow guide assembly. The flow guide assembly is used to drive the plurality of flow guide blades 9 to rotate synchronously.

[0027] It should be noted that the cover plate 3 has a sealing ring on the contact surface with the furnace body to prevent air leakage. The heat-insulating inner shell 4 forms a direct working chamber. Its inner wall withstands high temperatures and has good heat insulation performance. The power is precisely controlled by the external temperature control system of the heater 5 to achieve the heating curve and heat preservation temperature required by the process. Several guide vanes 9 are evenly distributed in the internal space of the heat-insulating inner shell 4 and are located on the side of the workpiece area. The shape of the vanes is airfoil-shaped to reduce airflow resistance and guide the airflow in the furnace.

[0028] Another embodiment based on the jet nozzle 401: The ordinary jet nozzle 401 is improved into a Venturi nozzle, which utilizes its unique streamlined structure (contraction section-throat-expansion section). When the high-pressure gas flows through the throat (the narrowest part), the flow velocity will increase sharply. In the expansion section, the static pressure of this high-speed airflow will be partially restored, but the average velocity of the final ejected airflow is much higher than that of the jet nozzle 401. The higher airflow velocity can more effectively blow away the heated static gas film attached to the workpiece surface, so that the cold gas can come into full contact with the workpiece surface, thereby achieving faster cooling.

[0029] Refer to the instruction manual appendix Figure 7 The air supply assembly includes a first motor 701 fixedly connected inside the air supply housing 6 and a fan blade 702 fixedly connected at one end to the output end of the first motor 701. The other end of the fan blade 702 is rotatably connected to the air supply housing 6. The first motor 701 is used to drive the fan blade 702 to rotate.

[0030] It should be noted that the first motor 701 is installed inside the air supply housing 6, driving the fan blade 702 to rotate at high speed. A negative pressure is formed at the connection between the air supply housing 6 and the air supply duct 601, continuously drawing in external cooling gas (such as nitrogen), which is accelerated by the fan blade 702 to form a high-pressure airflow that is blown into the furnace.

[0031] Refer to the instruction manual appendix Figure 4 The flow guiding assembly includes a drive module mounted on the frame 1 and a transmission module mounted on the drive module. The output end of the transmission module is connected to several flow guiding blades 9. The drive module is used to drive the transmission module to rotate and drive the several flow guiding blades 9 to rotate synchronously through the transmission module.

[0032] It should be noted that the drive module provides the original and controllable rotational power for the entire flow guiding system, and then the transmission module transmits and distributes the single rotational motion provided by the drive module synchronously and precisely to all the flow guiding blades 9 to ensure that they move in unison.

[0033] Refer to the instruction manual appendix Figure 4 The drive module includes a second motor 801 fixedly connected to the frame 1, an active rod 802 fixedly connected to the output end of the second motor 801 at one end, and a first bevel gear 803 fixedly connected to the active rod 802. The other end of the active rod 802 is fixedly connected to the guide vane 9. The active rod 802 is rotatably connected to the protective shell 2 and the heat-insulating inner shell 4. The second motor 801 is used to drive the active rod 802 to rotate.

[0034] It should be noted that the second motor 801 is mounted on the frame 1 and drives the first bevel gear 803 to rotate through the drive rod 802. The first bevel gear 803 is located between the protective shell 2 and the heat-insulating inner shell 4. While being limited, it avoids the high temperature from affecting the first bevel gear 803.

[0035] Refer to the instruction manual appendix Figure 4 The transmission module includes a second bevel gear 804 rotatably connected between the protective shell 2 and the heat-insulating inner shell 4, several third bevel gears 805 meshing with the second bevel gear 804, and a driven rod 806 fixedly connected to the third bevel gear 805. The second bevel gear 804 and the first bevel gear 803 are meshed together. The driven rod 806 is rotatably connected to the protective shell 2 and the heat-insulating inner shell 4. The end of the driven rod 806 away from the protective shell 2 is fixedly connected to the guide vane 9.

[0036] It should be noted that when the first bevel gear 803 rotates, the belt passes through the second bevel gear 804, the third bevel gear 805, and the driven rod 806 to realize the rotation of the guide vane 9. The second bevel gear 804 is a large bevel gear, while the first bevel gear 803 and the multiple second bevel gears 804 are of the same size and are small bevel gears. The first bevel gear 803 and the multiple second bevel gears 804 are evenly distributed around the second bevel gear 804 and correspond one-to-one with the guide vane 9 to achieve stable power transmission.

[0037] In another embodiment based on the first bevel gear 803, the second bevel gear 804, and the third bevel gear 805, the ordinary-shaped first bevel gear 803, the second bevel gear 804, and the third bevel gear 805 are replaced with helical bevel gears. When the first bevel gear 803, the second bevel gear 804, and the third bevel gear 805 mesh, the teeth make line contact and suddenly contact and separate along the entire tooth width. This "collision-type" meshing will generate greater impact, vibration, and noise. However, the helical bevel gear has a curved, helical tooth shape. When meshing, the teeth gradually contact from the root to the tip, and more teeth participate in the meshing. This "rolling" progressive meshing makes the transmission process very smooth, greatly reducing impact and vibration, thereby significantly reducing operating noise.

[0038] Refer to the instruction manual appendix Figure 5 The guide vane 9 has a tapered hole 901 inside, and a channel control component is installed inside the tapered hole 901. The channel control component is used to control the opening and closing of the tapered hole 901.

[0039] It should be noted that the conical hole 901 serves as a controllable auxiliary airflow channel within the guide vane. Through the channel control component, the channel inside the vane can be dynamically opened or closed at different stages of the cooling process, thereby enabling flexible switching of the cooling mode and precise fine-tuning of the airflow field inside the furnace. The inlet of the conical hole 901 is located at one end of the connecting rod 802 or the driven rod 806, and the outlet is located at the leading edge of the vane.

[0040] Refer to the instruction manual appendix Figure 5The channel control assembly includes a connecting rod 1001 with one end fixedly connected to a tapered hole 901, a memory alloy spring 1002 with one end fixedly connected to the other end of the connecting rod 1001, and a spherical plug 1003 fixedly connected to the other end of the memory alloy spring 1002. The spherical plug 1003 is slidably connected to the tapered hole 901.

[0041] It should be noted that the connecting rod 1001 is installed inside the conical hole 901, with its axis coinciding with the axis of the conical hole 901. The memory alloy spring 1002 has a special phase change characteristic. At lower temperatures, it is softer and more easily deformed. When the temperature rises to a certain critical point, it will completely recover its previously memorized shape and generate a huge restoring force. Therefore, when forced cooling begins in the furnace and the temperature drops, the spring is in a softer state, easily compressed, and shorter in length. The spherical plug 1003 opens the conical hole 901. When the furnace is at a high temperature, the spring is heated and will elongate, attempting to recover its memorized length. The spherical plug 1003 closes the conical hole 901, realizing the auxiliary jet function that is activated only during cooling, enhancing the uniformity and efficiency of cooling.

[0042] Refer to the instruction manual appendix Figure 6 A connector 11 is rotatably connected to the active rod 802. The end of the connector 11 and the driven rod 806 away from the heat-insulating inner shell 4 are both fixedly connected to the air supply shell 6 by an air supply pipe 12. An electric push rod 13 is fixedly connected to the frame 1. The output end of the electric push rod 13 is fixedly connected to the cover plate 3. The electric push rod 13 is used to drive the cover plate 3 to move along a preset direction.

[0043] It should be noted that both the active rod 802 and the driven rod 806 have gas delivery channels inside that are connected to the conical holes 901 of the guide vanes 9. The air supply housing 6, the gas delivery pipe 12, the driven rod 806 (connector 11, active rod 802), the guide vanes 9 and the furnace space are connected in sequence to form a complete auxiliary gas passage.

[0044] Working principle: After the device is started, the heater 5 operates, heating the working chamber inside the insulation inner shell 4 to the process temperature and maintaining the temperature. When rapid cooling is required, the first motor 701 drives the fan blade 702 to rotate at high speed, drawing in and pressurizing the cooling gas through the air supply pipe 601. The resulting high-pressure airflow is transported through the air supply shell 6 and finally ejected upwards through the nozzle 401 of the insulation inner shell 4 to cool the workpiece. At the same time, the second motor 801 drives the drive rod 802 to rotate, which in turn drives the first bevel gear 803 to rotate. The first bevel gear 803 meshes with the second bevel gear 804, driving the second bevel gear 804 to rotate. The second bevel gear 804 drives several third bevel gears 805 that mesh with it to rotate synchronously, causing the guide vanes 9 on the driven rod 806 and the drive rod 802 to deflect synchronously, guiding the airflow in the furnace to form a uniform flow. Turbulence enhances the cooling effect. During the cooling process, when the temperature is high, the shape memory alloy spring 1002 expands due to heat, pushing the spherical plug 1003 to move towards the throat in the conical hole 901 and seal it, closing the auxiliary air passage. When the temperature drops to the set value, the shape memory alloy spring 1002 contracts, and the spherical plug 1003 retracts under the pressure of airflow or the spring rebound, opening the conical hole 901. This allows some cooling gas to be transported from the air supply housing 6 through the air supply pipe 12 to the air supply channels inside the active rod 802 and the driven rod 806, and finally ejected through the conical hole 901 outlet at the leading edge of the guide vane 9, achieving directional auxiliary cooling. In addition, the electric push rod 13 can drive the cover plate 3 to move along a preset direction to open and close the working chamber, while the exhaust pipe 301 is used to discharge hot exhaust gas, together completing an efficient and controllable rapid cooling process.

[0045] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A rapid cooling device for a heat treatment furnace, characterized in that: The device includes a frame (1), a protective shell (2) fixedly connected to the frame (1), a cover plate (3) movably connected to the protective shell (2), an insulation inner shell (4) fixedly connected to the protective shell (2), a heater (5) fixedly connected to the insulation inner shell (4), and an air supply shell (6) fixedly connected to the bottom of the insulation inner shell (4). An exhaust pipe (301) is provided on the cover plate (3), and several jet nozzles (401) arranged in a circular pattern are provided at the bottom of the insulation inner shell (4). An air supply duct (601) is provided on the air supply shell (6), and an air supply assembly is installed inside the air supply shell (6). A flow guide assembly is installed on the frame (1), and several flow guide blades (9) are connected to the power output end of the flow guide assembly. The flow guide assembly is used to drive several flow guide blades (9) to rotate synchronously.

2. The rapid cooling device for a heat treatment furnace according to claim 1, characterized in that: The air supply assembly includes a first motor (701) fixedly connected inside the air supply housing (6) and a fan blade (702) fixedly connected at one end to the output end of the first motor (701). The other end of the fan blade (702) is rotatably connected to the air supply housing (6). The first motor (701) is used to drive the fan blade (702) to rotate.

3. The rapid cooling device for a heat treatment furnace according to claim 1, characterized in that: The flow guiding assembly includes a drive module mounted on the frame (1) and a transmission module mounted on the drive module. The output end of the transmission module is connected to several flow guiding blades (9). The drive module is used to drive the transmission module to rotate and drive the several flow guiding blades (9) to rotate synchronously through the transmission module.

4. A rapid cooling device for a heat treatment furnace according to claim 3, characterized in that: The drive module includes a second motor (801) fixedly connected to the frame (1), an active rod (802) fixedly connected to the output end of the second motor (801) at one end, and a first bevel gear (803) fixedly connected to the active rod (802). The other end of the active rod (802) is fixedly connected to the guide vane (9). The active rod (802) is rotatably connected to the protective shell (2) and the heat-insulating inner shell (4). The second motor (801) is used to drive the active rod (802) to rotate.

5. A rapid cooling device for a heat treatment furnace according to claim 4, characterized in that: The transmission module includes a second bevel gear (804) rotatably connected between the protective shell (2) and the heat-insulating inner shell (4), several third bevel gears (805) meshing with the second bevel gear (804), and a driven rod (806) fixedly connected to the third bevel gear (805). The second bevel gear (804) meshes with the first bevel gear (803), the driven rod (806) is rotatably connected to the protective shell (2) and the heat-insulating inner shell (4), and the end of the driven rod (806) away from the protective shell (2) is fixedly connected to the guide vane (9).

6. A rapid cooling device for a heat treatment furnace according to claim 1, characterized in that: The guide vane (9) has a conical hole (901) inside, and a channel control component is installed inside the conical hole (901). The channel control component is used to control the opening and closing of the conical hole (901).

7. A rapid cooling device for a heat treatment furnace according to claim 6, characterized in that: The channel control assembly includes a connecting rod (1001) with one end fixedly connected to a tapered hole (901), a memory alloy spring (1002) with one end fixedly connected to the other end of the connecting rod (1001), and a ball plug (1003) fixedly connected to the other end of the memory alloy spring (1002). The ball plug (1003) is slidably connected to the tapered hole (901).

8. A rapid cooling device for a heat treatment furnace according to claim 5, characterized in that: A connector (11) is rotatably connected to the active rod (802). The end of the connector (11) and the driven rod (806) away from the heat-insulating inner shell (4) are both fixedly connected to the air supply shell (6) by an air supply pipe (12). An electric push rod (13) is fixedly connected to the frame (1). The output end of the electric push rod (13) is fixedly connected to the cover plate (3). The electric push rod (13) is used to drive the cover plate (3) to move in a preset direction.

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