A gas stream classification device for superalloy powders

Abstract

The utility model discloses a high temperature alloy powder airflow grading device relates to powder metallurgy technical field, and this device includes the feed screen, feed screw conveyer, airflow breaker, baffle powder collector, cyclone powder collector and cloth bag dust catcher that connect gradually, the first port of cloth bag dust catcher air outlet connection three -way, the second port of three -way is connected through vacuum control valve rotatory blade vacuum pump, and the third port of three -way is connected through fan control valve fan, the utility model effectively solved the problem that oxygen nitrogen increases in traditional airflow grading device, powder impurity is difficult to control, and the quality of high temperature alloy powder has been improved significantly and reduced production cost.

Description

Technical Field

[0001] This utility model belongs to the field of powder metallurgy technology, specifically relating to a high-temperature alloy powder airflow classification device. Background Technology

[0002] High-temperature alloys, due to their excellent oxidation resistance, corrosion resistance, tensile and creep strength, fatigue performance, and long-term structural stability, have become key materials for high-temperature components in the aerospace field. Among them, powder metallurgy high-temperature alloys are the preferred materials for hot-end components of advanced aero-engines. Compared with traditional cast or wrought high-temperature alloys, powder metallurgy high-temperature alloys have significant advantages such as uniform microstructure, no macroscopic segregation, high yield strength, and good fatigue performance. Currently, airflow classification devices used for high-temperature alloy powder production are mostly derived from equipment in the biopharmaceutical industry. Because high-temperature alloys have extremely strict requirements for the content of oxygen, nitrogen, and impurity elements, existing devices are prone to oxygen and nitrogen enrichment in the powder, making it difficult to meet the production requirements of high-quality powders. Furthermore, the classification accuracy of existing devices is insufficient, making it difficult to effectively separate powders of different particle sizes, resulting in unstable particle size distribution in the product and affecting the final performance. Therefore, there is an urgent need for an efficient and reliable airflow classification device for high-temperature alloy powders to meet the requirements of high-quality production. Utility Model Content

[0003] This invention provides a high-temperature alloy powder airflow classification device to solve the problems mentioned above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-temperature alloy powder airflow classification device includes a feed screen, a feed screw conveyor, an airflow disperser, a baffle plate dust collector, a cyclone dust collector, and a bag filter dust collector connected in sequence; the outlet of the bag filter dust collector is connected to the first port of a tee; the second port of the tee is connected to a rotary vane vacuum pump through a vacuum control valve; and the third port of the tee is connected to a fan through a fan control valve.

[0006] Furthermore, the blower outlet is connected to the oil-free argon compressor inlet, and the oil-free argon compressor outlet is connected to the argon inlet of the airflow disperser and the baffle powder collector, respectively.

[0007] Furthermore, a baffle is provided on the upper part of the baffle powder collector. An airflow inlet is provided on one side of the cavity wall of the baffle, and an airflow outlet is provided on the other side of the cavity wall of the baffle, so as to extend the flow path of the powder.

[0008] Furthermore, the lower parts of the airflow disperser, baffle plate dust collector, cyclone dust collector, and bag dust collector are all cone-shaped structures, and the bottom of each cone-shaped structure is connected to a discharge valve.

[0009] Furthermore, the feeding screen includes a screen plate, the upper part of which is connected to the oversize powder collection tank, and the lower part of which is connected to the undersize powder collection tank. Both the oversize powder collection tank and the undersize powder collection tank are conical hopper structures, and the bottom of each conical hopper structure is connected to a discharge valve.

[0010] Furthermore, the discharge valve is a star-shaped discharge valve.

[0011] Furthermore, the feed screen plate has a mesh size of 5 mesh.

[0012] Furthermore, the upper cavity of the baffle dust collector has a cylindrical structure.

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

[0014] 1. This utility model uses an airflow disperser, a baffle plate powder collector, a cyclone powder collector, and a bag dust collector to collect powder in four stages, successively obtaining primary coarse powder, secondary coarse powder, fine powder, and ultrafine powder, effectively improving the classification efficiency and accuracy; the air outlet of the bag dust collector is connected to a three-way valve, and by vacuuming and purging with argon, the oxygen and nitrogen content in the system is reduced, thereby improving the quality of the high-temperature alloy powder.

[0015] 2. The blower outlet is connected to an oil-free argon compressor to achieve closed-loop recycling of argon, significantly reducing production costs;

[0016] 3. A baffle is installed at the top of the baffle plate powder collector to increase the flow path of the powder and improve the recovery efficiency of coarse powder;

[0017] 4. The lower part of the airflow disperser, baffle plate dust collector, cyclone dust collector and bag dust collector adopts a cone structure, and the bottom end is connected to the discharge valve to facilitate the discharge of powder and improve production efficiency.

[0018] 5. The feed screen, combined with the oversize and undersize powder collection tanks, completes the initial particle size screening and impurity removal.

[0019] 6. The discharge valve adopts a star-shaped discharge valve, which can more effectively control the amount of powder discharged and improve the accuracy of discharge.

[0020] 7. The feed sieve has a 5-mesh aperture, which can effectively remove impurities and large particles from the powder, thus improving the grading efficiency.

[0021] 8. The upper part of the baffle dust collector has a cylindrical structure, which can make the airflow diffuse evenly, reduce turbulence and powder deposition, and improve classification accuracy and dust collection efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] In the attached image:

[0024] 1. Feed screen; 2. Oversize powder collection tank; 3. Undersize powder collection tank; 4. Rotary rotary valve; 5. Feed screw conveyor; 6. Airflow disperser; 7. Baffle plate powder collector; 8. Cyclone powder collector; 9. Bag dust collector; 10. Vacuum control valve; 11. Fan control valve; 12. Rotary vane vacuum pump; 13. Fan; 14. Oil-free argon compressor; 15. T-junction; 16. Airflow inlet; 17. Airflow outlet. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, an airflow classification device suitable for producing high-temperature alloy powder includes a feed screen 1, a feed screw conveyor 5, an airflow disperser 6, a baffle plate dust collector 7, a cyclone dust collector 8, and a bag filter dust collector 9 connected in sequence; the outlet of the bag filter dust collector 9 is connected to the first port of a three-way valve 15; the second port of the three-way valve 15 is connected to a rotary vane vacuum pump 12 through a vacuum control valve 10; and the third port of the three-way valve 15 is connected to a fan 13 through a fan control valve 11.

[0027] High-temperature alloy powder is slowly added to the feed sieve 1 to remove impurities and large particles in advance. The oversize material enters the oversize collection tank 2, and the undersize material enters the undersize collection tank 3. Both the oversize collection tank 2 and the undersize collection tank 3 are conical structures, and each conical structure is connected to a discharge valve at its bottom. The discharge valve is preferably a star-shaped discharge valve. The bottom of the undersize collection tank 3 is connected to the star-shaped discharge valve 4. The high-temperature alloy powder enters the feed screw conveyor 5 through the star-shaped discharge valve 4 and is horizontally conveyed to the airflow disperser 6. The airflow disperser 6 has no impeller inside to avoid the powder being broken or its sphericity being damaged by the high-speed rotating impeller. Argon gas is introduced into the airflow disperser 6 to fluidize the powder. Fine powder is conveyed to the upper part of the airflow disperser 6 by the rising airflow, while coarse powder settles into the lower conical hopper of the airflow disperser 6 due to gravity being greater than the argon blowing force. Fine powder is carried by the argon gas flow into the baffle plate dust collector 7. The baffle plate dust collector 7 is cylindrical at the top and conical at the bottom. A baffle is installed inside the upper cylindrical part. One side of the baffle has an airflow inlet 16, and the other side has an airflow outlet 17, forming an annular airflow channel. This increases the powder travel distance and further recovers coarse powder whose gravity is greater than the argon blowing force. The coarse powder is collected in the lower conical hopper of the baffle plate dust collector 7, while the fine powder enters the cyclone dust collector 8 with the argon gas flow. In the cyclone dust collector 8, ultrafine powder enters the lower-stage bag filter dust collector 9 due to its low centrifugal force, while fine powder is collected in the lower conical hopper of the cyclone dust collector 8 due to its high centrifugal force. After four stages of dust collection—airflow disperser 6, baffle plate dust collector 7, cyclone dust collector 8, and bag filter dust collector 9—first-stage coarse powder, second-stage coarse powder, fine powder, and ultrafine powder are collected sequentially.

[0028] The outlet of the baghouse dust collector 9 is connected to a three-way valve 15. The first path connects to a rotary vane vacuum pump 12, controlled by a vacuum control valve 10. The second path connects to a blower 13, controlled by a blower control valve 11. Before starting the device, close the blower control valve 11, start the rotary vane vacuum pump 12, and open the vacuum control valve 10 to evacuate the entire airflow classification system to a vacuum level of 100 Pa. After closing the vacuum control valve 10, fill the airflow classification system with argon gas through an argon source until the gauge pressure reaches 0 Pa, ensuring that the airflow classification is carried out in an argon atmosphere to reduce oxygen and nitrogen content. At this point, the entire airflow classification system is filled with argon gas. Maintaining the argon atmosphere in the system, start the blower 13 and open the blower control valve 11 to begin feeding and production. The outlet of the blower 13 is connected to the inlet of the oil-free argon compressor 14. The argon gas discharged from the blower is compressed and then sent back to the argon inlet of the airflow disperser 6 and the baffle dust collector 7, realizing the recycling of argon gas and reducing production costs.

[0029] In summary, by optimizing the structure and connection method of each component, this utility model effectively solves the problems of nitrogen and oxygen enrichment and high impurity content in high-temperature alloy powder after treatment by airflow classification device in the prior art, thereby improving the quality of high-temperature alloy powder and reducing production costs. Therefore, this device has good practicality.

Claims

1. A high-temperature alloy powder airflow classification device, characterized in that... The system includes a feed screen (1), a feed screw conveyor (5), an airflow disperser (6), a baffle plate dust collector (7), a cyclone dust collector (8), and a bag dust collector (9) connected in sequence. The outlet of the bag dust collector (9) is connected to the first port of a tee (15). The second port of the tee (15) is connected to a rotary vane vacuum pump (12) through a vacuum control valve (10). The third port of the tee (15) is connected to a fan (13) through a fan control valve (11).

2. The high-temperature alloy powder airflow classification device according to claim 1, characterized in that: The outlet of the blower (13) is connected to the inlet of the oil-free argon compressor (14), and the outlet of the oil-free argon compressor (14) is connected to the argon inlet of the airflow disperser (6) and the baffle powder collector (7).

3. The high-temperature alloy powder airflow classification device according to claim 1, characterized in that: The baffle plate powder collector (7) is provided with a baffle plate on the upper part. One side of the baffle plate cavity wall is provided with an airflow inlet (16) and the other side of the baffle plate cavity wall is provided with an airflow outlet (17) to extend the flow path of the powder.

4. The high-temperature alloy powder airflow classification device according to claim 1, characterized in that: The lower part of the airflow disperser (6), the baffle plate dust collector (7), the cyclone dust collector (8) and the bag dust collector (9) are all cone-shaped structures, and the bottom of the cone-shaped structure is connected to a discharge valve.

5. The high-temperature alloy powder airflow classification device according to claim 1, characterized in that: The feeding screen (1) includes a screen plate, the upper part of which is connected to the oversize powder collection tank (2), and the lower part of which is connected to the undersize powder collection tank (3). Both the oversize powder collection tank (2) and the undersize powder collection tank (3) are cone-shaped structures, and the bottom of each cone-shaped structure is connected to a discharge valve.

6. A high-temperature alloy powder airflow classification device according to claim 4 or 5, characterized in that: The discharge valve is a star-shaped discharge valve (4).

7. The high-temperature alloy powder airflow classification device according to claim 1, characterized in that: The feed sieve (1) has a sieve plate aperture of 5 mesh.

8. The high-temperature alloy powder airflow classification device according to claim 1, characterized in that: The upper cavity of the baffle dust collector (7) is cylindrical.

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