CN114109817A

CN114109817A - Fixed scroll and scroll compressor having the same

Info

Publication number: CN114109817A
Application number: CN202010901176.XA
Authority: CN
Inventors: 林江波; 纪小坤
Original assignee: Danfoss Tianjin Ltd
Current assignee: Danfoss Tianjin Ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2022-03-01
Anticipated expiration: 2040-08-31
Also published as: CN114109817B

Abstract

The invention discloses a fixed scroll and a scroll compressor with the same. The fixed scroll includes: an end plate; a fixed scroll wrap projecting from one surface of the end plate; and an internal cavity formed in the end plate. By adopting the fixed scroll and the scroll compressor having the fixed scroll according to the embodiment of the present invention, for example, the weight of the scroll compressor can be reduced.

Description

Fixed scroll and scroll compressor having the same

Technical Field

Embodiments of the present invention relate to a fixed scroll and a scroll compressor having the same.

Background

The scroll compressor includes a fixed scroll and an orbiting scroll, which may be formed by casting.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a fixed scroll and a scroll compressor having the same, by which, for example, the weight of the scroll compressor can be reduced.

According to an embodiment of the present invention, there is provided a fixed scroll for a scroll compressor including: an end plate; a fixed scroll wrap projecting from one surface of the end plate; and an internal cavity formed in the end plate.

According to an embodiment of the invention, the inner cavity has two inner walls opposite in an axial direction of the end plate and two inner walls opposite in a radial direction of the end plate.

According to an embodiment of the present invention, the fixed scroll for a scroll compressor further includes: and a discharge hole formed in the end plate and communicating the internal cavity with the outside, for discharging the material from the internal cavity during the manufacturing process.

According to an embodiment of the invention, the internal cavity is a plurality of internal cavities arranged around the axis of the end plate.

According to an embodiment of the present invention, the fixed scroll for a scroll compressor further includes: a discharge hole formed in the end plate and communicating the plurality of internal cavities with the outside, for discharging a material from the plurality of internal cavities during a manufacturing process; and a port formed in the end plate, wherein the plurality of internal cavities includes two first internal cavities adjacent to the port and a plurality of second internal cavities between the two first internal cavities in a circumferential direction, and wherein the vent hole includes: first communicating holes respectively located between the adjacent first and second internal cavities and communicating the adjacent first and second internal cavities and located between the adjacent second internal cavities and communicating the adjacent second internal cavities; and a second communication hole communicating the two first internal cavities with the port.

According to an embodiment of the present invention, the port is at least one of a suction port and an injection port of the compressor or a dedicated port or ports.

According to an embodiment of the invention, the inner cavity has a circular, elliptical or polygonal cross-section in a plane perpendicular to the axial direction of the end plate.

According to an embodiment of the invention, the discharge orifice has a circular, elliptical or polygonal cross-section.

According to an embodiment of the invention, the end plate has: a plurality of reinforcing ribs spaced apart from the boss in a circumferential direction of the end plate; a plurality of first recesses formed between the plurality of reinforcing ribs; and a plurality of second recesses formed in the plurality of reinforcing ribs, respectively.

According to an embodiment of the present invention, the fixed scroll includes a plurality of the inner cavities arranged around an axis of the end plate, the plurality of the inner cavities are respectively opposed to the plurality of the reinforcing ribs in a radial direction of the end plate, and the plurality of the first recesses are respectively opposed to partition walls between adjacent two of the inner cavities in the radial direction of the end plate.

According to an embodiment of the invention, the end plate has a boss provided in the center of the other surface of the end plate, and the internal cavity is formed at least partially or entirely in the boss.

According to an embodiment of the present invention, the fixed scroll is formed by 3D printing.

There is also provided, in accordance with an embodiment of the present invention, a scroll compressor, including: the fixed scroll described above.

By adopting the fixed scroll and the scroll compressor having the fixed scroll according to the embodiment of the present invention, for example, the weight of the scroll compressor can be reduced.

Drawings

FIG. 1 is a schematic perspective view of a fixed scroll for a scroll compressor according to an embodiment of the present invention;

FIG. 2 is another schematic perspective view of a fixed scroll for a scroll compressor according to an embodiment of the present invention;

FIG. 3 is a schematic top view of the fixed scroll shown in FIG. 1;

FIG. 4 is a schematic side view of the fixed scroll shown in FIG. 1;

FIG. 5 is a schematic cross-sectional view of the fixed scroll taken along line AA in FIG. 3;

FIG. 6 is a schematic cross-sectional view of the fixed scroll taken along line BB in FIG. 4;

fig. 7 is a schematic enlarged view of a portion C shown in fig. 6: and

fig. 8 is a partially enlarged sectional view taken along a line DD in fig. 6.

Detailed Description

The invention is further described with reference to the following drawings and detailed description.

Referring to fig. 1 to 8, a fixed scroll 100 for a scroll compressor according to an embodiment of the present invention includes: an end plate 10; a fixed scroll wrap 20 protruding from one surface of the end plate 10; and an internal cavity 11 formed in the end plate 10. The internal cavity 11 has two inner walls 110 (see fig. 5) opposed in the axial direction of the end plate 10. The inner cavity 11 also has two inner walls 111 (see fig. 5, 6, 7) opposite in the radial direction of the end plate 10. The internal cavity 11 also has two inner walls 112 (see fig. 6) opposed in the circumferential direction of the end plate 10. The fixed scroll 100 may be formed by 3D printing, i.e. using an additive manufacturing method. The fixed scroll 100 may include a plurality of the inner cavities 11 spaced around the axis of the end plate 10. Alternatively, the fixed scroll 100 may include one inner cavity 11 arranged around the axis of the end plate 10, that is, the one inner cavity 11 is annular in a sectional view from a top view of the fixed scroll.

According to an embodiment of the present invention, referring to fig. 6, 7, 8, the fixed scroll 100 further includes a discharge hole 12 formed in the end plate 10 and communicating the inner cavity 11 with the outside, for discharging material, such as surplus manufacturing material, from the inner cavity 11 during the manufacturing process of the fixed scroll.

According to an embodiment of the present invention, referring to fig. 1 to 8, the fixed scroll 100 further includes: a discharge hole 12 (see fig. 6, 7) formed in the end plate 10 and communicating the inner cavity 11 with the outside, for discharging surplus manufacturing material from the inner cavity 11 in a manufacturing process of the fixed scroll; and a port formed in the end plate 10, which may be at least one of a suction port 15 and an injection port 16 (see fig. 6) of the compressor. Further, the port may also be one or more ports provided separately, i.e. dedicated one or more ports. Referring to fig. 6, a plurality of the internal cavities 11 includes: two first internal cavities 11A adjacent to the port and a plurality of second internal cavities 11B between the two first internal cavities 11A in the circumferential direction. The discharge hole 12 includes: first communication holes 121 respectively located between the adjacent first and second

internal cavities

11A and 11B and communicating the adjacent first and second

internal cavities

11A and 11B and located between the adjacent second internal cavities 11B and communicating the adjacent second internal cavities 11B; and a second communication hole 122 that communicates the two first internal cavities 11A with the ports. Excess manufacturing material is discharged from the internal cavity 11 through the port and the second communication hole 122. Although it is described in fig. 6 that the second communication hole 122 communicates with the suction port 15, the second communication hole 122 may communicate with the ejection port 16, or with one or more ports separately provided at any suitable position, as long as the excess manufacturing material can be discharged from the internal cavity 11 through the ports and the second communication hole 122. That is, when the ejection ports 16 are provided as ports, or separate ports are provided, the position of the second communication hole 122 is adjusted accordingly, ensuring that the second communication hole 122 communicates with the ejection ports 16, or with one or more ports separately provided at any suitable position.

According to an embodiment of the present invention, referring to fig. 6 and 7, the cross section of the internal cavity 11 in a plane perpendicular to the axial direction of the end plate 10 may be a cross section of a circle, an ellipse, a triangle, or a polygon (such as a diamond, a rectangle, a square, a regular pentagon, a hexagon), or any other suitable shape.

According to an embodiment of the present invention, referring to fig. 6 and 8, the cross-section of the discharge hole 12 may be a section of a circle, an ellipse, a triangle, or a polygon (such as a diamond, a rectangle, a square, a regular pentagon, a hexagon), or any other suitable shape.

According to an embodiment of the invention, with reference to fig. 1, 3, 5, the end plate 10 has: a boss 30 provided at the center of the other surface of the end plate 10; a plurality of reinforcing ribs 40 provided at intervals in the circumferential direction of the end plate 10 around the boss 30; a plurality of first recesses 41 formed between the plurality of reinforcing ribs 40; and a plurality of second recesses 42 respectively formed in the plurality of reinforcing ribs 40. As can be seen from fig. 5, the surface of the end plate 10 provided with the boss 30 is opposite to the other surface of the end plate 10 from which the fixed scroll lap 20 protrudes, that is: the boss 30 and the fixed scroll wrap 20 are respectively located on both sides in the axial direction of the fixed scroll 100. A plurality of first recesses 41 are provided at intervals in the circumferential direction of the end plate 10 around the boss 30, and a plurality of second recesses 42 are provided at intervals in the circumferential direction of the end plate 10 around the boss 30. Referring to fig. 1, 3 and 5, the internal cavity 11 is at least partially or entirely formed in the boss 30. The fixed scroll 100 further includes a discharge port 31 of the compressor formed in the boss 30. The boss 30 is used for connection to a discharge valve of the compressor.

According to an embodiment of the present invention, referring to fig. 1, 6, the plurality of internal cavities 11 are respectively opposed to the plurality of reinforcing ribs 40 in the radial direction of the end plate 10. The plurality of first recesses 41 are opposed to the partition walls 50 between the adjacent two inner cavities 11, respectively, in the radial direction of the end plate 10.

A scroll compressor according to an embodiment of the present invention includes: the fixed scroll 100 and the orbiting scroll described above. The movable scroll plate is provided with a movable scroll roll, and the movable scroll roll and the fixed scroll roll are matched to form a compression cavity for compressing a medium. Further, the scroll compressor 100 may further include: the device comprises a shell and a bracket arranged in the shell. A fixed scroll is fixed within the housing, and an orbiting scroll is rotatably supported on the bracket and engaged with the fixed scroll. The scroll compressor further comprises a driving mechanism which is fixed at the lower end of the shell and connected with the movable scroll plate to drive the movable scroll plate to rotate.

One example of a 3D printing method of a fixed scroll of a scroll compressor of the present invention is described below.

Establishing a 3D model of the fixed scroll in CAD software, heating and melting metal powder through a high-energy laser beam in a 3D printer, solidifying the molten metal powder, and constructing a complete fixed scroll layer by layer, wherein the specific additive manufacturing process comprises the following steps:

1. establishing a 3D model of the fixed scroll on a computer through CAD software, converting the model into a printable STL format, and sending the format to a control computer of a 3D printer for slicing and layering;

2. starting the 3D printer, and coating a layer of thermally fusible powder in the part building chamber;

3. scanning each layer of powder by a high-energy laser beam, enabling the temperature of the powder to reach a melting point by the action of the laser beam on the powder, so that the melted powder particles form a solid of the cross section of the fixed scroll, and the intensity of the laser beam is adjusted to only melt the area defined by the geometric figure of the part, and the surrounding powder is kept in loose powder shape and plays a natural supporting role;

4. when the cross section of the fixed scroll is completely scanned, the forming table surface is descended by a layer thickness distance, a layer of new powder is laid, next sintering is carried out, and the scanning process is repeated until the forming of the part is finished at last;

5. and taking out the printing piece, removing powder around the part, and discharging the powder inside the fixed scroll through the designed discharge hole. Specifically, the device is designed by a structure specially aiming at the discharge hole of the fixed scroll, and is inserted into the discharge hole of the fixed scroll, so that the device has elasticity and can be in seamless connection with the discharge hole, and the metal powder in the fixed scroll can be completely cleaned.

The additive manufacturing method may be selected from one of the following methods: direct metal additive manufacturing methods, direct metal laser sintering methods, Selective Laser Sintering (SLS), selective laser melt molding (SLM), electron beam melt molding (EBM), arc additive manufacturing techniques (WAAM), laser cladding techniques (LENS), nanoparticle spraying (NPJ), multi-jet Melting (MJF), stereolithography, stacked entity manufacturing methods, melt location modeling methods, and combinations thereof.

When the static scroll is produced by using the additive manufacturing method, the metal material can be selected from one of, but not limited to, the following materials: iron-based alloys, titanium and titanium-based alloys, nickel-based alloys, cobalt-chromium alloys, aluminum alloys, copper alloys, noble metals, and the like.

By adopting the fixed scroll and the scroll compressor having the fixed scroll according to the embodiment of the present invention, for example, the weight of the scroll compressor can be reduced. For example, the fixed scroll according to an embodiment of the present invention may be reduced in weight by about 30% while maintaining the strength as compared to the fixed scroll of a conventional scroll compressor.

According to an embodiment of the present invention, the solid reinforcement of the exterior of the fixed scroll of the conventional scroll compressor is replaced with the hollow reinforcing rib, and the solid boss of the fixed scroll of the conventional scroll compressor is replaced with the boss with the internal cavity, thereby reducing the weight of the fixed scroll of the scroll compressor while maintaining the strength of the fixed scroll.

Further, by providing the discharge hole 12, metal powder at the time of additive manufacturing of the fixed scroll can be discharged.

Claims

1. A stationary scroll for a scroll compressor, comprising:

end plate;

a fixed scroll extending from one surface of the end plate; and

Internal cavity formed in the end plate.

2. The fixed scroll for a scroll compressor according to claim 1, wherein:

The inner cavity has two opposite inner walls in the axial direction of the end plate and two opposite inner walls in the radial direction of the end plate.

3. The stationary scroll for a scroll compressor according to claim 1, further comprising:

Drain holes are formed in the end plates and communicate the interior cavity with the exterior for draining material from the interior cavity during the manufacturing process.

4. The stationary scroll for a scroll compressor of claim 1, wherein:

The inner cavity is a plurality of inner cavities arranged about the axis of the end plate.

5. The stationary scroll for a scroll compressor according to claim 4, further comprising:

a drain hole formed in the end plate and communicating the plurality of interior cavities with the exterior for draining material from the plurality of interior cavities during the manufacturing process; and

ports formed in the end plates,

wherein the plurality of interior cavities include two first interior cavities adjacent to the ports and a plurality of second interior cavities in the circumferential direction between the two first interior cavities, and

Wherein the discharge hole includes:

They are respectively located between the adjacent first inner cavities and second inner cavities and make the adjacent first inner cavities and second inner cavities communicate with each other and between the adjacent second inner cavities and make the same phase. a first communication hole that communicates with the adjacent second inner cavities; and a second communication hole that communicates the two first inner cavities with the port.

6. The fixed scroll for a scroll compressor of claim 5, wherein:

The port is at least one of a suction port and an injection port of the compressor or a dedicated port or ports.

7. The stationary scroll for a scroll compressor according to claim 1 or 4, wherein:

In a plane perpendicular to the axial direction of the end plate, the inner cavity has a circular, elliptical or polygonal cross-section.

8. The stationary scroll for a scroll compressor according to claim 3 or 5, wherein:

The discharge hole has a circular, elliptical or polygonal cross-section.

9. The fixed scroll for a scroll compressor of claim 1, wherein:

The end plate has:

a plurality of reinforcing ribs spaced apart in the circumferential direction of the end plate;

a plurality of first recesses formed between the plurality of reinforcing ribs; and

A plurality of second recesses are respectively formed in the plurality of reinforcing ribs.

10. The fixed scroll for a scroll compressor of claim 9, wherein:

The stationary scroll includes a plurality of the interior cavities arranged about the axis of the end plate,

a plurality of the inner cavities are respectively opposite to the plurality of the reinforcing ribs in the radial direction of the end plate, and

The plurality of first recesses are respectively opposite to the partition walls between two adjacent inner cavities in the radial direction of the end plate.

11. The stationary scroll for a scroll compressor according to any one of claims 1-6 and 9-10, wherein:

The end plate has a boss provided in the center of the other surface of the end plate, and at least a part or the whole of the inner cavity is formed in the boss.

12. The fixed scroll for a scroll compressor of claim 1, wherein:

The stationary scroll is formed by 3D printing.

13. A scroll compressor, comprising:

The fixed scroll of claim 1.