Powder delivery device

Abstract

The application discloses a powder feeding device. The powder feeding device comprises a body, the body having an air inlet channel, an air outlet channel and a powder storage chamber, the air inlet channel having a first air inlet and a first air outlet, the air outlet channel having a second air outlet and a second air inlet; a first shielding member and / or a second shielding member, the first shielding member being arranged in the powder storage chamber, the first shielding member having a first cavity, an opening of the first cavity being adjacent to the second air inlet, an edge of the opening of the first cavity and an edge of the second air inlet forming an air inlet annular gap; the second shielding member being arranged in the powder storage chamber, the second shielding member having a second cavity, an opening of the second cavity being adjacent to the first air outlet, an edge of the opening of the second cavity and an edge of the first air outlet forming an air outlet annular gap. The powder feeding device has the advantages of long powder feeding time, high powder feeding uniformity, high integration, small volume, multiple powder feeding, and powder feeding in a microgravity environment.

Description

Technical Field

[0001] This invention relates to the field of powder conveying, and more specifically, to powder conveying devices. Background Technology

[0002] Powder feeding technology is widely used in various fields such as materials, energy, manufacturing, industry, and agriculture. One application, PIV (Pulse-Induced Flow) technology, serves as a means of flow field visualization, used to display flow states and measure flow velocity. The quality of powder feeding significantly impacts the quality of the results. Related powder feeding technologies suffer from problems such as uneven powder feeding and inability to achieve continuous powder feeding. These problems are particularly pronounced in microgravity environments. Furthermore, these technologies, which feed powder directly from the powder box, require a large fluidization space, resulting in a large powder feeding device. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art. To this end, the present invention proposes a powder feeding device.

[0004] The powder feeding device according to the present invention includes: a body having an air inlet channel, an air outlet channel, and a powder storage chamber; the air inlet channel having a first air inlet and a first air outlet communicating with the powder storage chamber; the air outlet channel having a second air outlet and a second air inlet communicating with the powder storage chamber; and a first shielding member and / or a second shielding member, the first shielding member being disposed in the powder storage chamber, the first shielding member having a first cavity, the opening of the first cavity being adjacent to the second air inlet, wherein the edge of the opening of the first cavity is located outside the edge of the second air inlet, and an air inlet ring is formed between the edge of the opening of the first cavity and the edge of the second air inlet; the second shielding member being disposed in the powder storage chamber, the second shielding member having a second cavity, the opening of the second cavity being adjacent to the first air outlet, wherein the edge of the opening of the second cavity is located outside the edge of the first air outlet, and an air outlet ring is formed between the edge of the opening of the second cavity and the edge of the first air outlet.

[0005] The powder feeding device of the present invention has the advantages of long powder feeding time, high powder feeding uniformity, and the ability to feed powder multiple times, and / or high uniformity of gas and powder mixing, high degree of integration, and small size, and can feed powder in a microgravity environment.

[0006] Optionally, the first air outlet and the second air inlet are arranged opposite to each other, and the opening of the first cavity and the second air inlet are located on the same plane; and / or the opening of the second cavity and the first air outlet are located on the same plane.

[0007] Optionally, the body further has a powder loading hole communicating with the powder storage chamber, the diameter of the powder loading hole being greater than or equal to a second preset value, and the powder feeding device further includes: a sealing screw, the powder loading hole having an internal thread, the sealing screw being threaded into the powder loading hole; and a sealing ring, the sealing ring being disposed between the sealing screw and the wall surface of the powder loading hole.

[0008] Optionally, the wall of the powder storage chamber includes a first arc-shaped surface, and the air outlet ring mates with the first arc-shaped surface to form a swirling flow.

[0009] Optionally, the air outlet direction of the air outlet ring is tangent to the portion of the first arc-shaped surface adjacent to the air outlet ring.

[0010] Optionally, the wall of the powder storage chamber further includes a second arc-shaped surface, and the air intake direction of the air inlet is tangent to the portion of the second arc-shaped surface adjacent to the air inlet.

[0011] Optionally, the first shielding member is conical and the first cavity is conical, or the first shielding member is frustum-shaped and the first cavity is frustum-shaped, wherein the generatrix of the first cavity extends parallel to the tangential direction of the portion of the first arcuate surface adjacent to the air outlet; the second shielding member is conical and the second cavity is conical, or the second shielding member is frustum-shaped and the second cavity is frustum-shaped, wherein the generatrix of the second cavity extends parallel to the tangential direction of the portion of the second arcuate surface adjacent to the air inlet.

[0012] Optionally, the powder storage chamber includes: a first arc-shaped groove, the first arc-shaped groove surrounding the air outlet ring, the wall surface of the first arc-shaped groove forming the first arc-shaped surface, a first portion of the wall surface of the powder storage chamber located inside the first arc-shaped groove, a first air outlet opening on the first portion, the edge of the first portion located inside the edge of the opening of the second cavity, and the air outlet ring forming between the edge of the opening of the second cavity and the edge of the first portion; and / or a second arc-shaped groove, the second arc-shaped groove surrounding the air inlet ring, the wall surface of the second arc-shaped groove forming the second arc-shaped surface, a second portion of the wall surface of the powder storage chamber located inside the second arc-shaped groove, a second air inlet opening on the second portion, the edge of the second portion located inside the edge of the opening of the first cavity, and the air inlet ring forming between the edge of the opening of the first cavity and the edge of the second portion.

[0013] Optionally, the air intake channel includes a first air intake section, a first arc-shaped transition section, and a second air intake section connected in sequence. The free end of the first air intake section constitutes the first air inlet, and the free end of the second air intake section constitutes the first air outlet. The air outlet channel includes a first air outlet section, a second arc-shaped transition section, and a second air outlet section connected in sequence. The free end of the first air outlet section constitutes the second air inlet, and the free end of the second air outlet section constitutes the second air outlet. Each of the first air intake section and the second air outlet section extends along a first direction, and each of the second air intake section and the first air outlet section extends along a second direction, wherein the first direction is perpendicular to the second direction.

[0014] Optionally, the ratio of the cross-sectional area of ​​the outlet ring to the cross-sectional area of ​​the first inlet is 1:(0.7-1.3); and / or the radial dimension of the inlet ring in the second inlet is less than or equal to a first preset value. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the powder feeding device according to an embodiment of the present invention.

[0016] Figure 2 This is a cross-sectional view of a powder feeding device according to an embodiment of the present invention.

[0017] Figure 3 This is a cross-sectional view of a powder feeding device according to an embodiment of the present invention.

[0018] Figure 4 This is a partial cross-sectional schematic diagram of a powder feeding device according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the internal flow field of the powder feeding device according to an embodiment of the present invention.

[0020] Figures 6a-6c This is a schematic diagram of the structure of the first shielding member (second shielding member) of the powder feeding device according to an embodiment of the present invention.

[0021] Figure 7 This is a schematic diagram of a powder feeding device according to an embodiment of the present invention being 3D printed. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The powder feeding device 100 according to an embodiment of the present invention will now be described with reference to the accompanying drawings. Figures 1-6cAs shown, the powder feeding device 100 according to an embodiment of the present invention includes a body 1, and the powder feeding device 100 further includes a first blocking member 2 and / or a second blocking member 3. The body 1 has an air inlet channel 11, an air outlet channel 12, and a powder storage chamber 13. The air inlet channel 11 has a first air inlet 111 and a first air outlet 112, the first air outlet 112 communicating with the powder storage chamber 13. The air outlet channel 12 has a second air outlet 121 and a second air inlet 122, the second air inlet 122 communicating with the powder storage chamber 13.

[0024] A first shielding member 2 is disposed within the powder storage chamber 13. The first shielding member 2 has a first cavity 21, the opening 22 of which is adjacent to the second air inlet 122. The edge 221 of the opening 22 of the first cavity 21 is located outside the edge 1221 of the second air inlet 122, that is, the opening 22 of the first cavity 21 and the second air inlet 122 are arranged opposite to each other in the opening direction of the second air inlet 122. An air inlet ring 23 is formed between the edge 221 of the opening 22 of the first cavity 21 and the edge 1221 of the second air inlet 122.

[0025] Since the opening 22 of the first cavity 21 is adjacent to and opposite to the second air inlet 122, and the edge 221 of the opening 22 of the first cavity 21 is located outside the edge 1221 of the second air inlet 122, the first shielding member 2 substantially covers the second air inlet 122, that is, the first shielding member 2 shields the second air inlet 122 in the opening direction of the second air inlet 122.

[0026] As a result, the gas carrying the powder (hereinafter referred to as the powder-containing gas) cannot enter the second air inlet 122 along the opening direction of the second air inlet 122. As a result, most of the powder-containing gas flowing toward the second air inlet 122 is blocked by the first shielding member 2 and cannot enter the second air inlet 122. A small part of the powder-containing gas enters the second air inlet 122 through the air inlet ring 23 and is then discharged from the powder feeding device 100.

[0027] The powder-containing gas blocked by the first shielding member 2 flows towards the second air inlet 122 again, and only a small portion of the powder-containing gas enters the second air inlet 122 through the air inlet ring 23. This prevents the powder-containing gas from entering the outlet channel 12 all at once and then rushing out of the powder feeding device 100 all at once, thereby effectively extending the powder feeding time of the powder feeding device 100, meeting the requirements of multiple powder feedings, and improving the uniformity of powder feeding.

[0028] The second shielding member 3 is disposed within the powder storage chamber 13. The second shielding member 3 has a second cavity 31, the opening 32 of which is adjacent to the first air outlet 112. The edge 321 of the opening 32 of the second cavity 31 is located outside the edge 1121 of the first air outlet 112, that is, the opening 32 of the second cavity 31 and the first air outlet 112 are arranged opposite to each other in the opening direction of the first air outlet 112. An air outlet ring 33 is formed between the edge 321 of the opening 32 of the second cavity 31 and the edge 1121 of the first air outlet 112.

[0029] Since the opening 32 of the second cavity 31 is adjacent to and opposite to the first air outlet 112, and the edge 321 of the opening 32 of the second cavity 31 is located outside the edge 1121 of the first air outlet 112, the second shielding member 3 substantially covers the first air outlet 112, that is, the second shielding member 3 blocks the gas ejected from the first air outlet 112 in the opening direction of the first air outlet 112.

[0030] The gas ejected from the first outlet 112 is blocked by the second baffle 3, preventing it from continuing to flow along the opening direction of the first outlet 112. The gas can only flow from the outlet ring 33. This allows the gas to flow in different directions, thereby not only creating a certain degree of swirling flow to more thoroughly mix the gas with the powder in the powder storage chamber 13 and effectively improving the uniformity of the gas-powder mixture, but also enabling the powder feeding device 100 to feed powder in a microgravity environment.

[0031] Since the second shielding member 3 can create a certain degree of swirling flow in the gas entering the powder storage chamber 13, the powder can be fluidized in the powder storage chamber 13. As a result, the powder feeding device 100 can integrate multiple functions such as powder storage, fluidization and powder feeding, thereby reducing the volume of the powder feeding device 100, that is, the powder feeding device 100 occupies a small space.

[0032] like Figures 1-6c As shown, the powder feeding device 100 according to an embodiment of the present invention includes a body 1, a first shielding member 2, and a second shielding member 3. The body 1 has an air inlet channel 11, an air outlet channel 12, and a powder storage chamber 13. The air inlet channel 11 has a first air inlet 111 and a first air outlet 112, the first air outlet 112 being connected to the powder storage chamber 13. The air outlet channel 12 has a second air outlet 121 and a second air inlet 122, the second air inlet 122 being connected to the powder storage chamber 13.

[0033] like Figure 2 , Figure 3 and Figure 5As shown, the air intake channel 11 includes a first air intake section 113, a first arc-shaped transition section 114, and a second air intake section 115 connected in sequence. The free end of the first air intake section 113 forms a first air inlet 111, and the free end of the second air intake section 115 forms a first air outlet 112. The first air inlet 111 is located on the outer surface of the main body 1, and the first air outlet 112 is located on the wall of the powder storage chamber 13.

[0034] The air outlet channel 12 includes a first air outlet section 123, a second arc-shaped transition section 124, and a second air outlet section 125 connected in sequence. The free end of the first air outlet section 123 forms a second air inlet 122, and the free end of the second air outlet section 125 forms a second air outlet 121. The second air inlet 122 is located on the wall of the powder storage chamber 13, and the second air outlet 121 is located on the outer surface of the main body 1.

[0035] Each of the first intake section 113 and the second exhaust section 125 extends along a first direction, and each of the second intake section 115 and the first exhaust section 123 extends along a second direction, the first direction being perpendicular to the second direction. The diameter of the first intake section 113 may remain constant, or the diameter of the first intake section 113 may gradually decrease along the direction adjacent to the first arc-shaped transition section 114 (the direction of gas flow).

[0036] like Figure 2 , Figure 3 and Figure 5 As shown, the first air outlet 112 and the second air inlet 122 are arranged opposite to each other. In other words, the first air outlet 112 and the second air inlet 122 are arranged opposite to each other in this second direction, that is, the opening direction of the first air outlet 112 is opposite to the opening direction of the second air inlet 122. Optionally, the second air inlet section 115 and the first air outlet section 123 are arranged coaxially.

[0037] like Figures 1-5 As shown, the main body 1 also has a powder loading hole 14 communicating with the powder storage chamber 13, through which powder can be placed into the powder storage chamber 13. The powder feeding device 100 further includes a sealing screw 41 and a sealing ring 42. The powder loading hole 14 has an internal thread, the sealing screw 41 is threaded into the powder loading hole 14, and the sealing ring 42 is disposed between the sealing screw 41 and the wall surface of the powder loading hole 14. This can prevent air leakage at the powder loading hole 14, thereby improving the airtightness of the powder feeding device 100.

[0038] Optionally, the diameter of the powder loading hole 14 is greater than or equal to a second preset value. This facilitates the 3D printing of a small-sized powder feeding device 100 and allows for finishing through the powder loading hole 14.

[0039] The second shielding member 3 is disposed within the powder storage chamber 13. The second shielding member 3 has a second cavity 31, the opening 32 of which is adjacent to the first air outlet 112. Optionally, the opening 32 of the second cavity 31 and the first air outlet 112 are located on the same plane. Thus, the second shielding member 3 can better block the gas ejected from the first air outlet 112, thereby more effectively forming a swirling flow of gas.

[0040] The edge 321 of the opening 32 of the second cavity 31 is located outside the edge 1121 of the first air outlet 112, and an air outlet annular opening 33 is formed between the edge 321 of the opening 32 of the second cavity 31 and the edge 1121 of the first air outlet 112. Optionally, the ratio of the cross-sectional area of ​​the air outlet annular opening 33 to the cross-sectional area of ​​the first air inlet 111 is 1:(0.7-1.3). This ensures the flow rate of the gas entering the powder storage chamber 13.

[0041] A first shielding member 2 is disposed within the powder storage chamber 13. The first shielding member 2 has a first cavity 21, the opening 22 of which is adjacent to the second air inlet 122. The edge 221 of the opening 22 of the first cavity 21 is located outside the edge 1221 of the second air inlet 122. An air inlet ring 23 is formed between the edge 221 of the opening 22 of the first cavity 21 and the edge 1221 of the second air inlet 122.

[0042] Optionally, the opening 22 of the first cavity 21 and the second air inlet 122 are located on the same plane. This allows the first shielding member 2 to more effectively block the second air inlet 122 in the opening direction of the second air inlet 122, thereby preventing more powder-containing gas from entering the second air inlet 122, so as to further extend the powder feeding time of the powder feeding device 100 and further improve the powder feeding frequency and powder feeding uniformity.

[0043] Optionally, the radial dimension of the air inlet ring 23 in the second air inlet 122 (the opening 22 of the first cavity 21) is less than or equal to a first preset value. That is, the radial distance between the edge 221 of the opening 22 of the first cavity 21 and the edge 1221 of the second air inlet 122 in the second air inlet 122 is less than or equal to the first preset value. This allows the first blocking member 2 to more effectively block the second air inlet 122 in the opening direction of the second air inlet 122, thereby preventing more powder-containing gas from entering the second air inlet 122, so as to further extend the powder feeding time of the powder feeding device 100 and further improve the powder feeding frequency and powder feeding uniformity.

[0044] like Figure 2 , Figure 3 , Figure 5 as well as Figures 6a-6c As shown, the second blocking member 3 is conical, and the second cavity 31 is conical. Furthermore, both the second blocking member 3 and the second cavity 31 can be frustum-shaped. Figures 2-6c As shown, the first blocking member 2 is conical, and the first cavity 21 is conical. Furthermore, both the first blocking member 2 and the first cavity 21 can be frustum-shaped.

[0045] Optionally, the second shielding member 3 is connected to the wall of the powder storage chamber 13 via multiple second support members 52, and the first shielding member 2 is connected to the wall of the powder storage chamber 13 via multiple first support members 51. The multiple second support members 52 are arranged at equal intervals along the circumference of the first air outlet 112 (second cavity 31), and the multiple first support members 51 are arranged at equal intervals along the circumference of the second air inlet 122 (first cavity 21).

[0046] like Figure 2 , Figure 3 and Figure 5 As shown, the wall of the powder storage chamber 13 includes a first arcuate surface 131, and the air outlet 33 cooperates with the first arcuate surface 131 to form a swirling flow. This more effectively forms a swirling flow with the gas ejected from the air outlet 33, thereby making the gas and powder in the powder storage chamber 13 more fully mixed, further improving the uniformity of gas-powder mixing, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0047] Optionally, the outlet direction of the outlet ring 33 is tangent to the portion 1311 of the first arcuate surface 131 adjacent to the outlet ring 33. This more effectively forms a swirling flow of gas ejected from the outlet ring 33, thereby making the gas more thoroughly mixed with the powder in the powder storage chamber 13, further improving the uniformity of gas-powder mixing, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0048] like Figure 2 , Figure 3 and Figure 5 As shown, the wall of the powder storage chamber 13 also includes a second arc-shaped surface 132, and the air intake direction of the air inlet 23 is tangent to the portion 1321 of the second arc-shaped surface 132 adjacent to the air inlet 23. This more effectively forms a swirling flow of gas throughout the powder storage chamber 13, thereby making the gas and powder in the powder storage chamber 13 more thoroughly mixed, further improving the uniformity of gas and powder mixing, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0049] like Figure 2 , Figure 3 and Figure 5As shown, the powder storage chamber 13 includes a first arc-shaped groove 151 and a second arc-shaped groove 152. The first arc-shaped groove 151 is arranged around the air outlet ring 33, that is, the first arc-shaped groove 151 is annular. The wall surface of the first arc-shaped groove 151 forms a first arc-shaped surface 131. This more effectively causes the gas ejected from the air outlet ring 33 to form a swirling flow, thereby making the gas and powder in the powder storage chamber 13 more fully mixed, further improving the uniformity of gas and powder mixing, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0050] The second arc-shaped groove 152 is arranged around the air inlet ring 23, that is, the second arc-shaped groove 152 is annular. The wall surface of the second arc-shaped groove 152 forms the second arc-shaped surface 132. This more effectively causes the gas to form a swirling flow throughout the powder storage chamber 13, thereby making the gas and powder in the powder storage chamber 13 more fully mixed, further improving the uniformity of gas and powder mixing, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0051] The first portion 134 of the wall of the powder storage chamber 13 is located inside the first arc-shaped groove 151, that is, the first arc-shaped groove 151 surrounds the first portion 134. The first air outlet 112 is opened on the first portion 134. The edge of the first portion 134 is located inside the edge 321 of the opening 32 of the second cavity 31, and an air outlet ring 33 is formed between the edge 321 of the opening 32 of the second cavity 31 and the edge of the first portion 134.

[0052] The second portion 135 of the wall of the powder storage chamber 13 is located inside the second arc-shaped groove 152, that is, the second arc-shaped groove 152 surrounds the second portion 135. The second air inlet 122 is opened on the second portion 135. The edge of the second portion 135 is located inside the edge 221 of the opening 22 of the first cavity 21, and an air inlet ring 23 is formed between the edge 221 of the opening 22 of the first cavity 21 and the edge of the second portion 135.

[0053] Optionally, the generatrix of the first cavity 21 extends parallel to the tangential direction of the portion 1311 adjacent to the outlet annulus 33 of the first arcuate surface 131. Gas ejected from the first outlet 112 enters the first cavity 21 and flows along the wall of the first cavity 21, i.e., along the extending direction of the generatrix of the first cavity 21. By making the extending direction of the generatrix of the first cavity 21 parallel to the tangential direction of the portion 1311, the gas ejected from the outlet annulus 33 is more effectively made to form a swirling flow, so that the gas and powder in the powder storage chamber 13 are more thoroughly mixed, further improving the uniformity of gas-powder mixing and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0054] The generatrix of the second cavity 31 extends parallel to the tangent of the portion 1321 of the second arcuate surface 132 adjacent to the air inlet ring 23. This allows the powder-containing gas passing through the air inlet ring 23 to enter the second air inlet 122 more smoothly, and then to be discharged from the powder delivery device 100 more smoothly.

[0055] Optionally, the first air outlet 112 and the second air inlet 122 are symmetrically arranged with respect to a first plane, which is perpendicular to the opening direction of the first air outlet 112 (second air inlet 122). For example, the first plane is perpendicular to the second direction. The second shielding member 3 and the first shielding member 2 are symmetrically arranged with respect to the first plane. This makes it easier for the gas to form a swirling flow within the powder storage chamber 13.

[0056] like Figure 2 , Figure 3 and Figure 5 As shown, the wall of the powder storage chamber 13 also includes a cylindrical surface 133. The cylindrical surface 133 is located between the first arcuate surface 131 and the second arcuate surface 132 in the opening direction of the first air outlet 112 (second air inlet 122). The cylindrical surface 133 is connected to each of the first arcuate surface 131 and the second arcuate surface 132. This more effectively creates a swirling flow of gas throughout the powder storage chamber 13, thereby making the gas and powder in the powder storage chamber 13 more thoroughly mixed, further improving the uniformity of gas-powder mixing, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0057] The powder feeding device 100 can be manufactured using 3D printing. For example... Figure 7 As shown, during the 3D printing process, the powder loading hole 14 extends at a 45° angle to the horizontal plane. This is to provide support during printing to hold the second shielding member 3, allowing for layer-by-layer printing. The external support is removed directly after printing, while the internal support can be removed through the powder loading hole 14.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A powder feeding device, characterized in that, include: The main body has an air inlet channel, an air outlet channel, and a powder storage chamber. The air inlet channel has a first air inlet and a first air outlet communicating with the powder storage chamber. The air outlet channel has a second air outlet and a second air inlet communicating with the powder storage chamber. as well as A first shielding member and / or a second shielding member, wherein the first shielding member is disposed in the powder storage chamber, the first shielding member has a first cavity, the opening of the first cavity is adjacent to the second air inlet, wherein the edge of the opening of the first cavity is located outside the edge of the second air inlet, and an air inlet ring is formed between the edge of the opening of the first cavity and the edge of the second air inlet. The second shielding member is disposed in the powder storage chamber. The second shielding member has a second cavity. The opening of the second cavity is adjacent to the first air outlet. The edge of the opening of the second cavity is located outside the edge of the first air outlet. An air outlet ring is formed between the edge of the opening of the second cavity and the edge of the first air outlet.

2. The powder feeding device according to claim 1, characterized in that, The first air outlet and the second air inlet are arranged opposite to each other, wherein The opening of the first cavity and the second air inlet are located on the same plane; and / or The opening of the second cavity is located on the same plane as the first air outlet.

3. The powder feeding device according to claim 1, characterized in that, The main body also has a powder loading hole communicating with the powder storage chamber, the diameter of the powder loading hole being greater than or equal to a second preset value, and the powder feeding device further includes: A sealing screw, wherein the powder filling hole has an internal thread, and the sealing screw is threaded into the powder filling hole; A sealing ring is disposed between the sealing screw and the wall surface of the powder filling hole.

4. The powder feeding device according to claim 1, characterized in that, The wall of the powder storage chamber includes a first arc-shaped surface, and the air outlet ring cooperates with the first arc-shaped surface to form a swirling flow.

5. The powder feeding device according to claim 4, characterized in that, The air outlet direction of the air outlet ring is tangent to the portion of the first arc-shaped surface adjacent to the air outlet ring.

6. The powder feeding device according to claim 4, characterized in that, The wall of the powder storage chamber also includes a second arc-shaped surface, and the air intake direction of the air intake ring is tangent to the portion of the second arc-shaped surface adjacent to the air intake ring.

7. The powder feeding device according to claim 6, characterized in that, The first shielding member is conical and the first cavity is conical, or the first shielding member is frustum-shaped and the first cavity is frustum-shaped, wherein the generatrix of the first cavity extends in a direction parallel to the tangential direction of the portion of the first arcuate surface adjacent to the air outlet. The second shield is conical and the second cavity is conical, or the second shield is frustum-shaped and the second cavity is frustum-shaped, wherein the generatrix of the second cavity extends in a direction parallel to the tangential direction of the portion of the second arcuate surface adjacent to the air intake ring.

8. The powder feeding device according to claim 6, characterized in that, The powder storage chamber includes: A first arc-shaped groove surrounds the air outlet ring. The wall surface of the first arc-shaped groove forms the first arc-shaped surface. A first portion of the wall surface of the powder storage chamber is located inside the first arc-shaped groove. The first air outlet is opened on the first portion. The edge of the first portion is located inside the edge of the opening of the second cavity. The air outlet ring is formed between the edge of the opening of the second cavity and the edge of the first portion; and / or The second arc-shaped groove surrounds the air inlet ring. The wall of the second arc-shaped groove forms the second arc-shaped surface. The second part of the wall of the powder storage chamber is located inside the second arc-shaped groove. The second air inlet is opened on the second part. The edge of the second part is located inside the edge of the opening of the first cavity. An air inlet ring is formed between the edge of the opening of the first cavity and the edge of the second part.

9. The powder feeding device according to claim 1, characterized in that, The air intake channel includes a first air intake section, a first arc-shaped transition section and a second air intake section connected in sequence. The free end of the first air intake section constitutes the first air intake port and the free end of the second air intake section constitutes the first air outlet. The air outlet channel includes a first air outlet section, a second arc-shaped transition section, and a second air outlet section connected in sequence. The free end of the first air outlet section constitutes the second air inlet, and the free end of the second air outlet section constitutes the second air outlet. Each of the first air inlet section and the second air outlet section extends along a first direction, and each of the second air inlet section and the first air outlet section extends along a second direction. The first direction is perpendicular to the second direction.

10. The powder feeding device according to claim 1, characterized in that, The ratio of the cross-sectional area of ​​the exhaust ring to the cross-sectional area of ​​the first intake port is 1:(0.7-1.3); and / or The radial dimension of the air intake ring in the second air intake is less than or equal to a first preset value.

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