Powder feeding device

Abstract

The utility model discloses a powder feeding device. The powder feeding device comprises a body, the body is provided with an air inlet channel, an air outlet channel and a powder storage cavity, the air inlet channel is provided with a first air inlet and a first air outlet, and the air outlet channel is provided with a second air outlet and a second air inlet; the first shielding piece is connected with the wall face of the powder storage cavity, the first shielding piece is provided with a first cavity, an opening of the first cavity is adjacent to the second air inlet, and an air inlet ring opening is formed between the edge of the opening of the first cavity and the edge of the second air inlet; the second shielding piece is connected with the wall face of the powder storage cavity and provided with a second cavity, an opening of the second cavity is adjacent to the first air outlet, and an air outlet ring opening is formed between the edge of the opening of the second cavity and the edge of the first air outlet. The powder feeding device has the advantages of being long in powder feeding time, high in powder feeding uniformity, high in integration, small in size, capable of feeding powder for multiple times and capable of feeding powder in a microgravity environment.

Description

Technical Field

[0001] The utility model relates to the field of powder conveying, in particular to a powder conveying device. Background Art

[0002] Powder feeding technology is widely used in various fields such as materials, energy, manufacturing, industry and agriculture. One of its applications, PIV technology, as a means of flow field visualization technology, can be used to display flow status and measure flow velocity. The quality of powder feeding will greatly affect the quality of the results. Related powder feeding technologies have problems such as uneven powder feeding and inability to achieve continuous powder feeding. Especially in a microgravity environment, the problems of uneven and discontinuous powder feeding are more prominent. Moreover, the related technology uses a method of directly feeding powder from the powder box, which requires reserving a large fluidization space, resulting in a larger volume of the powder feeding device. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the utility model proposes a powder feeding device.

[0004] According to the utility model, the powder feeding device includes: 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 connected to the powder storage chamber, the air outlet channel having a second air outlet and a second air inlet connected to the powder storage chamber; and a first shielding member and / or a second shielding member, the first shielding member is connected to the wall surface of 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 The edge of the opening 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 connected to the wall of the powder storage chamber, and the second shielding member has a second cavity, and the opening of the second cavity is 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 utility model has the advantages of long powder feeding time, high powder feeding uniformity, and the ability to feed powder multiple times, and / or the advantages of high gas and powder mixing uniformity, 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 in the same plane; and / or the opening of the second cavity and the first air outlet are located in the same plane.

[0007] Optionally, the main body also has a powder loading hole connected to the powder storage chamber, the diameter of the powder loading hole is greater than or equal to a second preset value, and the powder feeding device further includes: a sealing screw, the powder loading hole has an internal thread, and the sealing screw thread is engaged in the powder loading hole; and a sealing ring, which is arranged between the sealing screw and the wall of the powder loading hole.

[0008] Optionally, the wall surface 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 swirl.

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

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

[0011] Optionally, the first shielding member is conical and the first cavity is conical, or the first shielding member is truncated cone and the first cavity is truncated cone, wherein the extension direction of the generatrix of the first cavity is parallel to the tangent direction of the portion of the first arc surface adjacent to the air outlet ring port; the second shielding member is conical and the second cavity is conical, or the second shielding member is truncated cone and the second cavity is truncated cone, wherein the extension direction of the generatrix of the second cavity is parallel to the tangent direction of the portion of the second arc surface adjacent to the air inlet ring port.

[0012] Optionally, the powder storage chamber includes: a first arc-shaped groove, which is arranged around the air outlet ring, and the wall of the first arc-shaped groove constitutes the first arc-shaped surface, the first part of the wall of the powder storage chamber is located on the inner side of the first arc-shaped groove, the first air outlet is opened on the first part, the edge of the first part is located on the inner side of the edge of the opening of the second cavity, and the air outlet ring is formed between the edge of the opening of the second cavity and the edge of the first part; and / or a second arc-shaped groove, which is arranged around the air inlet ring, and the wall of the second arc-shaped groove constitutes the second arc-shaped surface, the second part of the wall of the powder storage chamber is located on the inner side of the second arc-shaped groove, the second air inlet is opened on the second part, the edge of the second part is located on the inner side of the edge of the opening of the first cavity, and the air inlet ring is formed between the edge of the opening of the first cavity and the edge of the second part.

[0013] Optionally, the air inlet passage comprises a first air inlet section, a first arc-shaped transition section, and a second air inlet section connected in sequence, the free end of the first air inlet section constitutes the first air inlet, and the free end of the second air inlet section constitutes the first air outlet; the air outlet passage comprises 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, wherein 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, and the first direction is perpendicular to the second direction.

[0014] Optionally, the ratio of the cross-sectional area of ​​the air outlet ring opening to the cross-sectional area of ​​the first air inlet opening is 1:(0.7-1.3); and / or the radial dimension of the air inlet ring opening of the second air inlet opening is less than or equal to a first preset value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a powder feeding device according to an embodiment of the utility model.

[0016] Figure 2 It is a cross-sectional view of a powder feeding device according to an embodiment of the utility model.

[0017] Figure 3 It is a cross-sectional view of a powder feeding device according to an embodiment of the utility model.

[0018] Figure 4 It is a partial cross-sectional schematic diagram of a powder feeding device according to an embodiment of the utility model.

[0019] Figure 5 It is a schematic diagram of the internal flow field of the powder feeding device according to an embodiment of the utility model.

[0020] Figure 6a-6c It is a schematic structural diagram of a first shielding member (second shielding member) of a powder feeding device according to an embodiment of the utility model.

[0021] Figure 7 It is a schematic diagram of 3D printing processing of a powder feeding device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0023] The powder feeding device 100 according to an embodiment of the present utility model is described below with reference to the accompanying drawings. Figure 1-Figure 6cAs shown, the powder feeding device 100 according to the embodiment of the utility model includes a body 1, and the powder feeding device 100 also includes a first shielding member 2 and / or 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, and the first air outlet 112 is connected to the powder storage chamber 13. The air outlet channel 12 has a second air outlet 121 and a second air inlet 122, and the second air inlet 122 is connected to the powder storage chamber 13.

[0024] The first shielding member 2 is connected to the wall surface of the powder storage chamber 13, and has a first cavity 21, and the opening 22 of the first cavity 21 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 covering member 2 generally covers the second air inlet 122, that is, the first covering member 2 blocks 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 powder-containing gas) cannot enter the second air inlet 122 along the opening direction of the second air inlet 122, so that 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 toward 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 can prevent the powder-containing gas from entering the air outlet channel 12 at one time and then rushing out of the powder feeding device 100 at one time, thereby effectively extending the powder feeding time of the powder feeding device 100, meeting the requirements of multiple powder feeding, and improving the uniformity of powder feeding.

[0028] The second shielding member 3 is connected to the wall surface of the powder storage chamber 13, and has a second cavity 31, and the opening 32 of the second cavity 31 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 covering member 3 generally covers the first air outlet 112, that is, the second covering 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 gas outlet 112 is blocked by the second shielding member 3 and cannot continue to flow along the opening direction of the first gas outlet 112, and the gas can only flow from the gas outlet ring 33. In this way, the gas can flow in different directions, so that not only can the gas form a certain degree of swirl, so that the gas and the powder in the powder storage chamber 13 are more fully mixed, effectively improving the uniformity of the gas and powder mixing, but also the powder feeding device 100 can deliver powder in a microgravity environment.

[0031] Since the second shielding member 3 can make the gas entering the powder storage chamber 13 form a certain degree of swirl, the powder can be fluidized in the powder storage chamber 13. In this way, the powder feeding device 100 can integrate multiple functions of 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 Figure 1-Figure 6c As shown, the powder feeding device 100 according to the embodiment of the utility model 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, and the first air outlet 112 is connected to the powder storage chamber 13. The air outlet channel 12 has a second air outlet 121 and a second air inlet 122, and the second air inlet 122 is connected to the powder storage chamber 13.

[0033] like Figure 2 , Figure 3 and Figure 5As shown, the air inlet channel 11 includes a first air inlet section 113, a first arc-shaped transition section 114 and a second air inlet section 115 which are connected in sequence. The free end of the first air inlet section 113 constitutes a first air inlet 111, and the free end of the second air inlet section 115 constitutes a first air outlet 112. The first air inlet 111 is provided on the outer surface of the body 1, and the first air outlet 112 is provided on the wall surface 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 constitutes a second air inlet 122, and the free end of the second air outlet section 125 constitutes a second air outlet 121. The second air inlet 122 is opened on the wall surface of the powder storage chamber 13, and the second air outlet 121 is opened on the outer surface of the body 1.

[0035] Each of the first air inlet section 113 and the second air outlet section 125 extends along a first direction, and each of the second air inlet section 115 and the first air outlet section 123 extends along a second direction, and the first direction is perpendicular to the second direction. The diameter of the first air inlet section 113 may remain unchanged, and the diameter of the first air inlet section 113 may also gradually decrease in a direction adjacent to the first arc-shaped transition section 114 (the flow direction of the gas).

[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 the 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 Figure 1-Figure 5 As shown, the body 1 also has a powder loading hole 14 connected to the powder storage chamber 13, and the powder can be put into the powder storage chamber 13 through the powder loading hole 14. 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, and the sealing screw 41 is threadedly engaged in the powder loading hole 14. The sealing ring 42 is arranged between the sealing screw 41 and the wall surface of the powder loading hole 14. In this way, air leakage at the powder loading hole 14 can be avoided, thereby improving the air tightness of the powder feeding device 100.

[0038] Optionally, the diameter of the powder loading hole 14 is greater than or equal to the second preset value, thereby facilitating 3D printing of a small-sized powder feeding device 100 and making it easier to perform fine processing through the powder loading hole 14 .

[0039] The second shielding member 3 is disposed in the powder storage chamber 13, and has a second cavity 31, and an opening 32 of the second cavity 31 is adjacent to the first gas outlet 112. Optionally, the opening 32 of the second cavity 31 is located in the same plane as the first gas outlet 112. Thus, the second shielding member 3 can better block the gas ejected from the first gas outlet 112, so as to more effectively form a swirl of the gas.

[0040] The edge 321 of the opening 32 of the second cavity 31 is located outside the edge 1121 of the first gas outlet 112, and 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 gas outlet 112. Optionally, the ratio of the cross-sectional area of ​​the air outlet ring 33 to the cross-sectional area of ​​the first gas inlet 111 is 1:(0.7-1.3). In this way, the flow rate of the gas entering the powder storage chamber 13 can be guaranteed.

[0041] The first shielding member 2 is disposed in the powder storage chamber 13, and has a first cavity 21, and an opening 22 of the first cavity 21 is adjacent to the second air inlet 122. An edge 221 of the opening 22 of the first cavity 21 is located outside an 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 in the same plane. Thus, the first shielding member 2 can more effectively shield 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 times and powder feeding uniformity.

[0043] Optionally, the radial dimension of the air inlet ring 23 at the second air inlet 122 (the opening 22 of the first cavity 21) is less than or equal to a first preset value. In other words, 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 at the second air inlet 122 is less than or equal to a first preset value. In this way, the first shielding member 2 can more effectively shield 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 number of powder feedings and the uniformity of powder feeding.

[0044] like Figure 2 , Figure 3 , Figure 5 as well as Figure 6a-6c As shown, the second shielding member 3 is conical, and the second cavity 31 is conical. In addition, the second shielding member 3 and the second cavity 31 can both be truncated cone-shaped. Figure 2-6c As shown, the first shielding member 2 is conical, and the first cavity 21 is conical. In addition, both the first shielding member 2 and the first cavity 21 can be truncated cone-shaped.

[0045] Optionally, the second shielding member 3 is connected to the wall of the powder storage chamber 13 through a plurality of second supporting members 52, and the first shielding member 2 is connected to the wall of the powder storage chamber 13 through a plurality of first supporting members 51. The plurality of second supporting members 52 are arranged at equal intervals along the circumference of the first air outlet 112 (second cavity 31), and the plurality of first supporting 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 surface of the powder storage chamber 13 includes a first arc surface 131, and the air outlet ring 33 cooperates with the first arc surface 131 to form a swirl. Thus, the gas ejected from the air outlet ring 33 is more effectively formed into a swirl, so that the gas and the powder in the powder storage chamber 13 are more fully mixed, further improving the uniformity of the mixing of the gas and the powder, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0047] Optionally, the outlet direction of the air outlet ring 33 is tangent to the portion 1311 of the first arc-shaped surface 131 adjacent to the air outlet ring 33. Thus, the gas ejected from the air outlet ring 33 is more effectively formed into a swirl, so that the gas and the powder in the powder storage chamber 13 are more fully mixed, the uniformity of the mixing of the gas and the powder is further improved, and the fluidization degree of the powder in the powder storage chamber 13 is further improved.

[0048] like Figure 2 , Figure 3 and Figure 5 As shown, the wall surface of the powder storage chamber 13 further includes a second arc surface 132, and the air intake direction of the air intake ring 23 is tangent to a portion 1321 of the second arc surface 132 adjacent to the air intake ring 23. Thus, the gas is more effectively swirl-formed in the entire powder storage chamber 13, so that the gas and the powder in the powder storage chamber 13 are more fully mixed, further improving the uniformity of the mixing of the gas and the powder, 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 arcuate groove 151 and a second arcuate groove 152. The first arcuate groove 151 is arranged around the air outlet ring 33, that is, the first arcuate groove 151 is annular. The wall surface of the first arcuate groove 151 constitutes the first arcuate surface 131. In this way, the gas ejected from the air outlet ring 33 is more effectively formed into a swirl, so that the gas and the powder in the powder storage chamber 13 are more fully mixed, further improving the uniformity of the mixing of the gas and the powder, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0050] The second arc groove 152 is arranged around the air inlet ring 23, that is, the second arc groove 152 is annular. The wall surface of the second arc groove 152 constitutes the second arc surface 132. In this way, the gas is more effectively swirled in the entire powder storage chamber 13, so that the gas and the powder in the powder storage chamber 13 are more fully mixed, further improving the uniformity of the mixing of the gas and the powder, 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 is arranged around 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 is arranged around 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 extension direction of the generatrix of the first cavity 21 is parallel to the tangent direction of the portion 1311 of the first arc-shaped surface 131 adjacent to the air outlet ring 33. The gas ejected from the first air outlet 112 enters the first cavity 21, and then flows along the wall surface of the first cavity 21, that is, flows along the extension direction of the generatrix of the first cavity 21. By making the extension direction of the generatrix of the first cavity 21 parallel to the tangent direction of the portion 1311, the gas ejected from the air outlet ring 33 is more effectively formed into a swirl flow, so that the gas is more fully mixed with the powder in the powder storage chamber 13, further improving the uniformity of the mixing of the gas and the powder, and further improving the fluidization degree of the powder in the powder storage chamber 13.

[0054] The extension direction of the generatrix of the second cavity 31 is parallel to the tangent direction of the portion 1321 of the second arc surface 132 adjacent to the air inlet ring 23. Thus, the powder-containing gas passing through the air inlet ring 23 can enter the second air inlet 122 more smoothly, and then be discharged from the powder feeding device 100 more smoothly.

[0055] Optionally, the first air outlet 112 and the second air inlet 122 are symmetrically arranged relative to a first plane, and the first plane is perpendicular to the opening direction of the first air outlet 112 (the 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 relative to the first plane. This makes it easier for the gas to form a swirl in the powder storage chamber 13.

[0056] like Figure 2 , Figure 3 and Figure 5 As shown, the wall surface of the powder storage chamber 13 also includes a cylindrical surface 133, and the cylindrical surface 133 is located between the first curved surface 131 and the second curved surface 132 in the opening direction of the first gas outlet 112 (the second gas inlet 122), and the cylindrical surface 133 is connected to each of the first curved surface 131 and the second curved surface 132. In this way, the gas is more effectively swirl-formed in the entire powder storage chamber 13, so that the gas and the powder in the powder storage chamber 13 are more fully mixed, the uniformity of the mixing of the gas and the powder is further improved, and the fluidization degree of the powder in the powder storage chamber 13 is further improved.

[0057] The powder feeding device 100 can be manufactured by 3D printing. Figure 7 As shown, during the 3D printing process, the extension direction of the powder loading hole 14 is placed at 45° to the horizontal plane, which is to add support during the printing process so as to support the second shielding member 3 to achieve layer-by-layer printing. The external support is directly removed after the printing is completed, and the internal support can be removed through the powder loading hole 14.

[0058] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A powder feeding device, characterized in that: include: 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 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; as well as A first shielding member and / or a second shielding member, wherein the first shielding member is connected to a wall surface of 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 an edge of the opening of the first cavity is located outside an 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 connected to the wall of the powder storage chamber, and the second shielding member has a second cavity, the opening of the second cavity is 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.

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 in the same plane; and / or The opening of the second cavity and the first air outlet are located in the same plane.

3. The powder feeding device according to claim 1, characterized in that: The body further comprises a powder loading hole connected to the powder storage chamber, the diameter of the powder loading hole is greater than or equal to a second preset value, and the powder feeding device further comprises: A sealing screw, the powder loading hole having an internal thread, the sealing screw thread being fitted in the powder loading hole; A sealing ring is arranged between the sealing screw and the wall surface of the powder loading hole.

4. The powder feeding device according to claim 1, characterized in that: The wall surface 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 swirl 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 a portion of the first arc surface adjacent to the air outlet ring.

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

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 truncated cone and the first cavity is truncated cone, wherein the extension direction of the generatrix of the first cavity is parallel to the tangent direction of the portion of the first arc surface adjacent to the air outlet ring; The second shielding member is conical and the second cavity is conical, or the second shielding member is truncated cone and the second cavity is truncated cone, wherein the extension direction of the generatrix of the second cavity is parallel to the tangent direction of the portion of the second arc surface adjacent to the air inlet ring.

8. The powder feeding device according to claim 6, characterized in that: The powder storage chamber comprises: a first arc-shaped groove, wherein the first arc-shaped groove is arranged around the air outlet ring, the wall surface of the first arc-shaped groove constitutes the first arc-shaped surface, the first part of the wall surface of the powder storage chamber is located on the inner side of the first arc-shaped groove, the first air outlet is opened on the first part, the edge of the first part is located on the inner side of the edge of the opening of the second cavity, and the air outlet ring is formed between the edge of the opening of the second cavity and the edge of the first part; and / or A second arc-shaped groove, the second arc-shaped groove is arranged around the air inlet ring, the wall of the second arc-shaped groove constitutes the second arc-shaped surface, the second part of the wall of the powder storage chamber is located on the inner side of the second arc-shaped groove, the second air inlet is opened on the second part, the edge of the second part is located on the inner side of the edge of the opening of the first cavity, and 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 inlet passage comprises a first air inlet section, a first arc-shaped transition section and a second air inlet section which are connected in sequence, the free end of the first air inlet section forming the first air inlet, and the free end of the second air inlet section forming 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, wherein 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, and 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 air outlet ring to the cross-sectional area of ​​the first air inlet is 1:(0.7-1.3); and / or A dimension of the air inlet ring in the radial direction of the second air inlet is less than or equal to a first preset value.

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