A powder vacuum screening device and method matching a vacuum bag

Abstract

The present invention relates to a powder vacuum screening device matching a vacuum bag, including a screening container, a coarse powder collecting device, a storage cylinder, a piston cover and a pressure-resistant pipe; the electromagnetic valve is opened, so that the high-pressure inert gas in the screening container rushes into the storage cylinder, and the high-pressure inert gas will carry the powder through the screen at the same time, the fine powder will be brought into the storage cylinder by the inert gas, the coarse powder will be blocked by the screen, the inert gas rushing into the storage cylinder will push the piston cover to slide upward, and reach pressure balance, close the electromagnetic valve, so that the fine powder is stored in the storage cylinder, and the storage cylinder is filled with inert gas to protect the fine powder from oxidation. The present invention can prevent the powder from contacting with the atmosphere during the screening and bag preparation process, significantly improve the surface quality of the powder, and reduce the degree of oxidation on the powder surface and the gas adsorption content.

Description

Technical Field

[0001] The present invention relates to the field of powder metallurgy, and in particular to a powder vacuum screening device matching a vacuum jacket and a method thereof. Background Art

[0002] With the continuous improvement of thrust-to-weight ratio and reliability requirements for aircraft engines, the requirements for the uniformity of structure and performance stability of nickel-based high-temperature alloy turbine disks are getting higher and higher, which requires finer powder particle size. High-temperature alloy powder is one of the key raw materials for advanced powder metallurgy technology. At present, there are two main methods for preparing high-temperature alloy powder: Plasma Rotating Electrode Process (PREP) and Argon Atomization (AA). Compared with the PREP method, the powder prepared by the AA method has the advantages of high fine powder yield, low cost, small average particle size and uniform microstructure. Therefore, the AA method has become the preferred technology for the preparation of fine powder.

[0003] The turbine disk prepared by fine powder has a series of advantages such as uniform organization and stable performance, which can significantly improve the long-term service performance of key hot end components such as turbine disks. However, due to the characteristics of high fine powder content, small average powder particle size and large specific surface area, the powder prepared by the AA method has the characteristics of high fine powder content, small average powder particle size and large specific surface area. Under the same storage and transportation and atmospheric exposure conditions, such as powder screening and package preparation, fine powder is more prone to surface oxidation and gas adsorption than coarse powder, which in turn has an adverse effect on the powder oxygen content and package quality, and ultimately affects the uniformity of the organization and performance stability of the powder high-temperature alloy turbine disk, for example, it will significantly increase the tendency of the formation of the prior particle boundary (PPB), and reduce the high-temperature long-term service performance of the material.

[0004] In summary, the turbine disks prepared from fine powders have good uniformity of organization and good performance stability, and thus are increasingly widely used in advanced manufacturing fields such as aircraft engine turbine disks. However, fine powders are very easy to oxidize during conventional atmospheric screening. Therefore, it is urgent to carry out research on powder vacuum screening technology with matching sleeves, improve the surface quality of high-temperature alloy powders, improve the uniformity of organization and performance stability of powder high-temperature alloy turbine disks, and accelerate the development of advanced aircraft engines in my country. Summary of the invention

[0005] The purpose of the invention is to solve the technical problem that powder is easily oxidized during screening, transfer and packaging preparation.

[0006] The technical solution of the present invention is:

[0007] Provided is a powder vacuum screening device matching a vacuum bag, comprising a screening container 1, a coarse powder collecting device 2, a material storage cylinder 3, a piston sealing cover 4 and a pressure-resistant tube 5;

[0008] The screening container is provided with a powder receiving port 6, an inert gas inlet 7, an inert gas outlet 8, a coarse powder outlet 9 and a fine powder outlet 10;

[0009] The powder receiving port is in sealed communication with a powder discharging port of a powder atomization preparation system, and the coarse powder outlet is in communication with a coarse powder collecting device;

[0010] The inert gas inlet is used to introduce inert gas, and a first switch valve 11 is provided at the inert gas inlet, and the first switch valve 11 can be controlled to open and close; the inert gas outlet is used to guide the inert gas, so that the inert atmosphere is maintained in the screening container and an inert gas circulation is formed;

[0011] The fine powder outlet is connected to the storage cylinder through a pressure-resistant pipe, and an opening 17 connected to the pressure-resistant pipe is provided at the bottom of the storage cylinder; the pressure-resistant pipe is provided with a solenoid valve 12, and the solenoid valve can be controlled to open and close;

[0012] The fine powder outlet is also provided with a screen 18, which allows the fine powder to pass through and blocks the coarse powder;

[0013] The bottom of the material storage cylinder is also provided with a discharge port 16, which can be in sealing communication with the vacuum jacket.

[0014] Furthermore, the inert gas inlet is connected to an air intake pump 13, and the air intake pump is used to pressurize the screening container. The inert gas is introduced into the screening container under the action of the air intake pump.

[0015] Furthermore, the inert gas outlet is provided with a second switch valve 14.

[0016] Furthermore, a third switch valve 15 is provided at the coarse powder outlet.

[0017] Furthermore, a fourth switch valve 19 is provided at the discharge port of the storage cylinder.

[0018] Furthermore, the inert gas outlet is connected to an air outlet pump, and the air outlet pump is used to drive the inert gas to circulate in a non-pressurized state. This helps the powder in the atomization chamber to quickly enter the screening container. Preferably, the inert gas outlet is located at the top of the screening container, and the inert gas inlet is located in the middle or lower part of the screening container. More preferably, the inert gas inlet and the screen are located on both sides of the screening container and are opposite to each other.

[0019] Furthermore, the bottom of the storage cylinder is a slope or a cone, and the position of the discharge port is lower than the opening connected to the pressure-resistant pipe, so that the fine powder can enter the bag conveniently.

[0020] A method for screening fine powder and storing it by using the powder vacuum screening device is provided:

[0021] Step 1, keep introducing inert gas through the inert gas inlet so that the inert gas fills the screening container, and at the same time receive the powder input from the powder atomization preparation system through the powder receiving port;

[0022] Step 2, closing the powder receiving port, the inert gas outlet, the coarse powder outlet and the fine powder outlet, continuing to introduce the inert gas (for example, using a booster pump to input the inert gas), increasing the pressure in the screening container to reach the target value, and then closing the first switch valve;

[0023] Step 3, open the solenoid valve, so that the high-pressure inert gas in the screening container rushes into the storage cylinder, and the high-pressure inert gas will carry the powder through the screen at the same time, the fine powder will be brought into the storage cylinder by the inert gas, and the coarse powder will be blocked by the screen. The inert gas rushing into the storage cylinder will push the piston cover to slide upward and reach pressure balance, close the solenoid valve, so that the fine powder and the inert gas are stored in the storage cylinder, and the inert gas filled in the storage cylinder protects the fine powder from being oxidized.

[0024] Furthermore, the target value in step 2 is between 0.6 and 0.8 MPa.

[0025] Furthermore, the amount of powder entering the screening container from the atomizing chamber at one time is 5 to 20 kg.

[0026] The advantages of the present invention are: the present invention can prevent the powder from contacting the atmosphere during the screening and encapsulation preparation process, significantly improve the surface quality of the powder, and reduce the degree of oxidation on the powder surface and the gas adsorption content. Thus, a nickel-based high-temperature alloy powder with a lower oxygen content is obtained, the PPB content in the microstructure of the turbine disk is effectively reduced, and the organizational uniformity and performance stability of the powder high-temperature alloy turbine disk parts are significantly improved, which helps the rapid development of nickel-based high-temperature alloy powders for advanced powder metallurgy technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a system principle diagram of the present invention;

[0028] Among them: screening container 1, coarse powder collecting device 2, storage cylinder 3, piston cover 4, pressure-resistant tube 5, powder receiving port 6, inert gas inlet 7, inert gas outlet 8, coarse powder outlet 9, fine powder outlet 10, first switch valve 11, solenoid valve 12, air intake pump 13, second switch valve 14, third switch valve 15, discharge port 16, opening 17, screen 18, fourth switch valve 19, air outlet pump 20, bag cover 21, powder atomization preparation system 22. DETAILED DESCRIPTION

[0029] The disclosed examples will be more fully described with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0030] See attached Figure 1 The present invention provides a powder vacuum screening device matching a vacuum bag, comprising a screening container 1, a coarse powder collecting device 2, a storage cylinder 3, a piston cover 4 and a pressure-resistant tube 5;

[0031] The screening container is provided with a powder receiving port 6, an inert gas inlet 7, an inert gas outlet 8, a coarse powder outlet 9 and a fine powder outlet 10;

[0032] The powder receiving port is in sealed communication with a powder discharging port of a powder atomization preparation system, and the coarse powder outlet is in communication with a coarse powder collecting device;

[0033] The inert gas inlet is used to introduce inert gas, and a first switch valve 11 is provided at the inert gas inlet, and the first switch valve 11 can be controlled to open and close; the inert gas outlet is used to guide the inert gas, so that the inert atmosphere is maintained in the screening container and an inert gas circulation is formed;

[0034] The fine powder outlet is connected to the storage cylinder through a pressure-resistant pipe, and an opening 17 connected to the pressure-resistant pipe is provided at the bottom of the storage cylinder; the pressure-resistant pipe is provided with a solenoid valve 12, and the solenoid valve can be controlled to open and close;

[0035] The fine powder outlet is also provided with a screen 18, which allows the fine powder to pass through and blocks the coarse powder;

[0036] The bottom of the material storage cylinder is also provided with a discharge port 16, which can be in sealing communication with the vacuum jacket.

[0037] The inert gas inlet is connected to an air intake pump 13, and the air intake pump is used to pressurize the screening container. The inert gas is passed into the screening container under the action of the air intake pump.

[0038] The inert gas outlet is provided with a second switch valve 14 .

[0039] A third on-off valve 15 is provided at the coarse powder outlet.

[0040] A fourth switch valve 19 is provided at the discharge port of the storage cylinder.

[0041] The inert gas outlet is connected to an air outlet pump, and the air outlet pump is used to drive the inert gas to circulate in a non-pressurized state. This helps the powder in the atomization chamber to quickly enter the screening container. Preferably, the inert gas outlet is located at the top of the screening container, and the inert gas inlet is located in the middle or lower part of the screening container. More preferably, the inert gas inlet and the screen are located on both sides of the screening container and are opposite to each other.

[0042] The bottom of the storage cylinder is a slope or a cone, and the position of the discharge port is lower than the opening connected to the pressure-resistant pipe, so that the fine powder can enter the bag conveniently.

[0043] A method for screening fine powder and storing it by using the powder vacuum screening device is provided:

[0044] Step 1, keep introducing inert gas through the inert gas inlet so that the inert gas fills the screening container, and at the same time receive the powder input from the powder atomization preparation system through the powder receiving port;

[0045] Step 2, closing the powder receiving port, the inert gas outlet, the coarse powder outlet and the fine powder outlet, continuing to introduce the inert gas, increasing the pressure in the screening container to reach the target value, and then closing the first switch valve;

[0046] Step 3, open the solenoid valve, so that the high-pressure inert gas in the screening container rushes into the storage cylinder, and the high-pressure inert gas will carry the powder through the screen at the same time, the fine powder will be brought into the storage cylinder by the inert gas, and the coarse powder will be blocked by the screen. The inert gas rushing into the storage cylinder will push the piston cover to slide upward and reach pressure balance, close the solenoid valve, so that the fine powder and the inert gas are stored in the storage cylinder, and the inert gas filled in the storage cylinder protects the fine powder from being oxidized.

[0047] The target value in step 2 is 0.6-0.8 MPa.

[0048] The amount of powder entering the screening container from the atomization chamber at one time is 5 to 20 kg.

[0049] The description of different advantageous arrangements has been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples may describe different advantages over other advantageous examples. The selected example or examples are chosen and described in order to best illustrate the principles of the examples, the practical application, and to enable those of ordinary skill in the art to understand the disclosure with various examples with various modifications suitable for the particular use contemplated.

Claims

1. A method for storing fine powder by screening a powder vacuum screening device, the method matching a vacuum-encapsulated powder vacuum screening device, characterized in that: The vacuum-encapsulated powder vacuum screening device comprises a screening container (1), a coarse powder collecting device (2), a material storage cylinder (3), a piston sealing cover (4) and a pressure-resistant pipe (5); The screening container is provided with a powder receiving port (6), an inert gas inlet (7), an inert gas outlet (8), a coarse powder outlet (9) and a fine powder outlet (10); the powder receiving port is sealedly connected to a powder discharge port of a powder atomization preparation system, and the coarse powder outlet is connected to a coarse powder collecting device; The inert gas inlet is used to introduce inert gas, and a first switch valve (11) is provided at the inert gas inlet, and the first switch valve (11) can be controlled to open and close; the inert gas outlet is used to guide the inert gas out, so that an inert atmosphere is maintained in the screening container and an inert gas circulation is formed; The fine powder outlet is connected to the storage cylinder through a pressure-resistant pipe, and the bottom of the storage cylinder is provided with an opening (17) connected to the pressure-resistant pipe; the pressure-resistant pipe is provided with a solenoid valve (12), and the solenoid valve can be controlled to open and close; the fine powder outlet is also provided with a screen (18), and the screen can allow fine powder to pass through and block coarse powder; the bottom of the storage cylinder is also provided with a discharge port (16), and the discharge port can be sealed and connected to the vacuum bag; The method comprises the following steps: Step 1, keep introducing inert gas through the inert gas inlet so that the inert gas fills the screening container, and at the same time receive the powder input from the powder atomization preparation system through the powder receiving port; Step 2, closing the powder receiving port, the inert gas outlet, the coarse powder outlet and the fine powder outlet, continuing to introduce the inert gas, inputting the inert gas with a booster pump, increasing the pressure in the screening container to reach the target value, and then closing the first switch valve; Step 3, open the solenoid valve, so that the high-pressure inert gas in the screening container rushes into the storage cylinder, and the high-pressure inert gas will carry the powder through the screen at the same time, the fine powder will be brought into the storage cylinder by the inert gas, and the coarse powder will be blocked by the screen. The inert gas rushing into the storage cylinder will push the piston cover to slide upward and reach pressure balance, close the solenoid valve, so that the fine powder and the inert gas are stored in the storage cylinder, and the inert gas filled in the storage cylinder protects the fine powder from being oxidized.

2. The method for storing fine powder by screening the powder vacuum screening device according to claim 1, characterized in that: The inert gas inlet is connected to an air intake pump (13), and the air intake pump is used to pressurize the screening container. The inert gas is introduced into the screening container under the action of the air intake pump.

3. The method for storing fine powder by screening the powder vacuum screening device according to claim 1, characterized in that: The inert gas outlet is provided with a second switch valve (14).

4. The method for storing fine powder by screening the powder vacuum screening device according to claim 1, characterized in that: The coarse powder outlet is provided with a third on-off valve (15).

5. The method for storing fine powder by screening the powder vacuum screening device according to claim 1, characterized in that: The material outlet of the material storage cylinder is provided with a fourth switch valve (19).

6. The method for storing fine powder by screening the powder vacuum screening device according to claim 1, characterized in that: The inert gas outlet is connected to an air outlet pump, which is used to drive the inert gas to circulate under non-pressurized conditions. The inert gas outlet is located at the top of the screening container, and the inert gas inlet is located in the middle or lower part of the screening container. The inert gas inlet and the screen are located on both sides of the screening container and are opposite to each other.

7. The method for storing fine powder by screening the powder vacuum screening device according to claim 1, characterized in that: The bottom of the material storage cylinder is a sloped surface or a conical surface, and the position of the discharge port is lower than the opening connected to the pressure-resistant pipe.

8. The method for storing fine powder by screening the powder vacuum screening device according to claim 1, characterized in that: The target value in step 2 is 0.6-0.8 MPa.

9. The method for storing fine powder by screening the powder vacuum screening device according to claim 1, characterized in that: The amount of powder entering the screening container from the atomization chamber at one time is 5 to 20 kg.

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