A gas guide structure for a pit carburizing process

Abstract

The utility model belongs to heat treatment equipment technical field especially relates to a gas flow guide structure for well type carburizing process, including well type carburizing furnace, support, hydraulic telescopic link, connecting seat, furnace top cover, motor, transmission shaft, impeller, air intake, air intake pipe, heating device. The gas flow guide structure for well type carburizing process, for optimizing the uniformity of gas distribution in carburizing process, especially set up conical air guide structure in air intake pipe inside. When the conical angle is accurately set to 45 DEG, can the gas concentration deviation of different areas in the furnace be reduced to the lowest, significantly improve carburizing treatment effect, the spiral flow guide groove of the air intake pipe inner wall is designed carefully and the conical air guide structure is complementary, the synergistic effect of both, can effectively guide gas to form the stable airflow of spiral rising in the air intake pipe, ensure that gas can be in the state of high uniformity from the air outlet to the workpiece surface, thereby realize the uniform carburizing of workpiece, guarantee the consistency and reliability of product quality.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment equipment technology, specifically a gas guiding structure for well-type carburizing process. Background Technology

[0002] In the booming development of modern manufacturing, surface treatment processes for metal materials have become a key link in improving product performance. Well-type carburizing, as a widely used heat treatment method, leverages its core technology of infiltrating carbon atoms into the surface of metal workpieces. This can increase surface hardness by 30%-50%, enhance wear resistance by 2-3 times, and significantly improve fatigue strength, playing an indispensable role in fields such as automotive engine gears and precision aerospace components. As the core equipment carrying out the well-type carburizing process, the uniform flow and efficient distribution of gas within the well-type carburizing furnace, much like the circulatory system in the human body supports vital activities, directly determines the quality of the carburizing effect and is crucial to the final performance and quality of the product.

[0003] However, traditional pit-type carburizing furnaces have long been hampered by technical bottlenecks in gas flow. Actual production data shows that uneven gas distribution within the furnace results in a carburized layer thickness error of up to ±0.2mm on the surface of the same batch of workpieces, severely impacting product quality stability and uniformity, and increasing the defect rate. Furthermore, low gas flow efficiency extends the carburizing process time by 20%-30% and increases energy costs by 15%-20%. In addition, existing flow structures are vulnerable to high-temperature corrosion, exhibiting significant deficiencies in high-temperature resistance and sealing. Frequent gas leaks reduce carburizing gas utilization by approximately 15%, not only wasting resources but also disrupting production continuity due to frequent component replacements, hindering the efficient and stable operation of the entire carburizing process. With the continuously increasing demands for metal material performance in high-end manufacturing, breaking through the technical constraints of traditional pit-type carburizing furnace gas flow structures and achieving efficient and uniform gas distribution has become a key breakthrough for improving the quality and efficiency of the carburizing process. Utility Model Content

[0004] The purpose of this invention is to provide a gas guiding structure for well-type carburizing processes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a gas guiding structure for a pit-type carburizing process, comprising a pit-type carburizing furnace and a support, wherein the support is fixedly connected to the side of the pit-type carburizing furnace, a hydraulic telescopic rod is provided inside the support, a connecting seat is connected to the top of the hydraulic telescopic rod, and a furnace top cover is connected to the other end of the connecting seat, a motor is provided above the furnace top cover, a drive shaft is connected to the bottom of the motor, an impeller is provided on the outer surface of the drive shaft, an air inlet is provided inside the drive shaft, an air inlet pipe is connected to the top of the furnace top cover, a heating device is provided inside the pit-type carburizing furnace, and an air guiding structure is provided inside the air inlet pipe.

[0006] Preferably, the air inlet duct is provided with a conical air guide structure, and the cone angle of the conical air guide structure is in the range of 30°-60°.

[0007] Preferably, the impeller is made of a high-temperature resistant alloy.

[0008] Preferably, the bottom of the pit-type carburizing furnace is provided with an air inlet, which is connected to an external gas supply device, and a flow regulating valve is provided at the air inlet.

[0009] Preferably, the upper end of the air inlet pipe is provided with an air outlet, which is connected to the workpiece placement area of ​​the pit-type carburizing furnace.

[0010] Preferably, a sealing ring is provided at the connection between the air inlet pipe and the furnace top cover, and the sealing ring is made of high-temperature resistant and elastic silicone rubber.

[0011] Preferably, the heating device includes a ring-shaped resistance heating wire and a heat-insulating ceramic sleeve wrapped around the resistance heating wire.

[0012] Preferably, the inner wall of the air inlet pipe is provided with a spiral guide groove, which cooperates with the conical air guide structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The gas guiding structure used in the well-type carburizing process has a conical air guiding structure inside the air inlet pipe with a cone angle in the range of 30°-60°. When the cone angle is 45°, it can control the gas concentration deviation at different positions in the furnace to a very small range, significantly improving the carburizing effect. The spiral guide groove on the inner wall of the air inlet pipe works in conjunction with the conical air guiding structure to guide the gas to form a spiral upward airflow in the air inlet pipe, so that the gas flows more evenly from the outlet to the workpiece, achieving uniform carburizing.

[0015] 2. The gas flow guiding structure used in the pit carburizing process has an air inlet at the bottom of the pit carburizing furnace connected to an external gas supply device, and a flow regulating valve is provided at the air inlet. The flow rate of the gas entering the furnace can be precisely adjusted according to different carburizing process requirements to meet the needs of different working conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the internal structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0019] In the diagram: 1. Pit-type carburizing furnace; 2. Support frame; 3. Hydraulic telescopic rod; 4. Connecting seat; 5. Furnace top cover; 6. Motor; 7. Drive shaft; 8. Impeller; 9. Air inlet; 10. Air inlet pipe; 11. Heating device. 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 Figures 1-3 This utility model provides a technical solution: a gas guiding structure for a pit-type carburizing process, including a pit-type carburizing furnace 1 and a support 2. The support 2 is fixedly connected to the side of the pit-type carburizing furnace 1. A hydraulic telescopic rod 3 is provided inside the support 2. A connecting seat 4 is connected to the top of the hydraulic telescopic rod 3. The other end of the connecting seat 4 is connected to a furnace top cover 5. A motor 6 is provided above the furnace top cover 5. A drive shaft 7 is connected to the bottom of the motor 6. An impeller 8 is provided on the outer surface of the drive shaft 7. An air inlet 9 is opened inside the drive shaft 7. An air inlet pipe 10 is connected to the top of the furnace top cover 5. A heating device 11 is provided inside the pit-type carburizing furnace 1. An air guiding structure is provided inside the air inlet pipe 10.

[0022] The air inlet pipe 10 is equipped with a conical air guide structure. The cone angle of the conical air guide structure is in the range of 30°-60°. When the cone angle is 45°, the gas concentration deviation at different positions in the furnace can be controlled within a very small range, which significantly improves the carburizing effect.

[0023] Impeller 8 is made of high-temperature resistant alloy, which has good strength and stability in high-temperature environments. It can withstand the high temperature in the pit carburizing furnace without deformation, ensuring the long-term stable operation of the flow guide structure.

[0024] The bottom of the pit-type carburizing furnace 1 is equipped with an air inlet, which is connected to an external gas supply device. The air inlet is also equipped with a flow regulating valve, which can precisely adjust the gas flow rate into the furnace according to different carburizing process requirements to meet the needs under different working conditions.

[0025] The upper end of the air inlet pipe 10 is provided with an air outlet, which is connected to the workpiece placement area of ​​the pit-type carburizing furnace 1. After the gas is guided by the air inlet pipe 10, it can flow evenly from the air outlet to the workpiece, thereby achieving uniform carburizing of the workpiece.

[0026] A sealing ring is provided at the connection between the air inlet pipe 10 and the furnace top cover 5. The sealing ring is made of high-temperature resistant and elastic silicone rubber to prevent carburizing gas from leaking from the connection gap between the air inlet pipe 10 and the furnace top cover 5. The sealing ring has a trapezoidal cross-sectional shape, which facilitates installation and enhances the sealing effect.

[0027] The heating device 11 includes a ring-shaped resistance heating wire and a heat-insulating ceramic sleeve wrapped around the resistance heating wire. The heat-insulating ceramic sleeve can effectively reduce heat loss and improve heating efficiency. The resistance heating wire is connected to an external power supply through a temperature control system, and the heating temperature can be precisely adjusted according to the requirements of the carburizing process.

[0028] The inner wall of the air inlet duct 10 is provided with a spiral guide groove. The spiral guide groove works in conjunction with the conical air guide structure to further guide the gas to form a spiral upward airflow in the air inlet duct 10, so that the gas flows more evenly from the air outlet to the workpiece. The pitch and depth of the spiral guide groove are optimized according to the pipe diameter and gas flow rate of the air inlet duct 10.

[0029] Working Principle: During operation, the external gas supply device introduces gas into the furnace through the bottom inlet. A flow regulating valve at the inlet allows for precise adjustment of the gas flow rate. Motor 6 drives the transmission shaft 7, which in turn rotates the impeller 8. Gas enters through the inlet pipe 10. The 30°-60° conical air guide structure and spiral guide grooves inside the inlet pipe 10 work together to guide the gas into a spiral upward airflow, ensuring uniform gas flow from the top outlet to the workpiece placement area, achieving uniform carburization. The resistance heating wire of the furnace heating device 11 is powered by an external power source under the control of the temperature control system. A heat-insulating ceramic sleeve surrounding the wire reduces heat loss, ensuring the furnace reaches the appropriate carburizing temperature. The impeller 8 is made of high-temperature resistant alloy, ensuring stable operation in high-temperature environments. A trapezoidal cross-section silicone rubber sealing ring at the connection between the inlet pipe 10 and the furnace top cover 5 prevents carburizing gas leakage, ensuring the smooth progress of the carburizing process.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A gas guiding structure for a pit-type carburizing process, comprising a pit-type carburizing furnace (1) and a support (2), characterized in that: The bracket (2) is fixedly connected to the side of the pit-type carburizing furnace (1). The bracket (2) is equipped with a hydraulic telescopic rod (3). The top of the hydraulic telescopic rod (3) is connected to a connecting seat (4). The other end of the connecting seat (4) is connected to a furnace top cover (5). A motor (6) is installed above the furnace top cover (5). A drive shaft (7) is connected to the bottom of the motor (6). An impeller (8) is installed on the outer surface of the drive shaft (7). An air inlet (9) is opened inside the drive shaft (7). An air inlet pipe (10) is connected to the top of the furnace top cover (5). A heating device (11) is installed inside the pit-type carburizing furnace (1). An air guide structure is installed inside the air inlet pipe (10).

2. The gas guiding structure for well-type carburizing process according to claim 1, characterized in that: The air inlet pipe (10) is provided with a conical air guide structure inside, and the cone angle of the conical air guide structure is in the range of 30°-60°.

3. The gas guiding structure for well-type carburizing process according to claim 1, characterized in that: The impeller (8) is made of a high-temperature resistant alloy.

4. A gas guiding structure for well-type carburizing process according to claim 1, characterized in that: The bottom of the pit-type carburizing furnace (1) is provided with an air inlet, which is connected to an external gas supply device, and a flow regulating valve is provided at the air inlet.

5. A gas guiding structure for well-type carburizing process according to claim 1, characterized in that: The upper end of the air inlet pipe (10) is provided with an air outlet, which is connected to the workpiece placement area of ​​the pit carburizing furnace (1).

6. A gas guiding structure for well-type carburizing process according to claim 1, characterized in that: A sealing ring is provided at the connection between the air inlet pipe (10) and the furnace top cover (5). The sealing ring is made of high-temperature resistant and elastic silicone rubber.

7. A gas guiding structure for well-type carburizing process according to claim 1, characterized in that: The heating device (11) includes a ring-shaped resistance heating wire and a heat-insulating ceramic sleeve wrapped around the resistance heating wire.

8. A gas guiding structure for well-type carburizing process according to claim 1, characterized in that: The inner wall of the air inlet pipe (10) is provided with a spiral guide groove.

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