WO2018036381A1 - Movable scroll component, method for processing same, and scroll compressor - Google Patents

Abstract

A movable scroll component comprises an end plate (164), a scroll blade (166) formed at one side of the end plate (164), and a hub (162) formed at the other side of the end plate (164). The hub (162) comprises an approximately cylindrical wall portion (W) comprising an inner root portion (IR) at an inner side of the hub (162) and an outer root portion (OR) at an outer side of the hub (162). The other side of the end plate (164) comprises a thrust bearing surface (T) and a bottom surface (B) at the inner side of the hub (162). The inner root portion (IR) is offset by a predetermined distance (h1) in a longitudinal direction of the movable scroll component opposite to a side of the outer root portion (OR) facing the scroll blade (166). A method for processing the movable scroll component and a scroll compressor configured with the movable scroll component are further comprised. Since fatigue failure at the inner root portion of the movable scroll component is reduced, the movable scroll component has a long operational life, simple processing, and is low cost.

Description

Moving scroll component and processing method thereof, and scroll compressor

The present disclosure claims the priority of the Chinese Patent Application, filed on Aug. 23, 2016, the disclosure of which is hereby incorporated by reference.

Technical field

The present disclosure relates to an orbiting scroll member and a method of processing the same, and a scroll compressor including the same.

Background technique

The content of this section merely provides background information related to the present disclosure, which may not constitute prior art.

Scroll compressors typically include a compression mechanism comprised of a fixed scroll member and an orbiting scroll member. The orbiting scroll member engages with the fixed scroll member and is driven to rotate relative to the fixed scroll member under the drive of the drive shaft to effect compression of the working fluid.

When developing compressors of different capacities (especially for larger capacities), it is necessary to ensure that the components have sufficient strength. One of the considerations for an orbiting scroll component is to ensure the strength at the hub of the orbiting scroll component. For example, for a particular type of orbiting scroll component, the strength is sufficient when applied to a platform of smaller capacity, but when applied to a larger capacity platform, the hub of the orbiting scroll component is subjected to a larger drive. Some or even all of the fatigue damage may occur due to the load. Manufacturers of compressors expect to have as few models as possible to save cost and increase inventory efficiency. Therefore, it is desirable to have a better way to take advantage of existing models, rather than redesigning or even recreating new models.

Summary of the invention

It is an object of the present disclosure to provide an orbiting scroll member that improves fatigue damage.

Another object of the present disclosure is to improve the fatigue failure characteristics of existing moving scroll components by simple machining.

According to an aspect of an embodiment of the present disclosure, an orbiting scroll component is provided, comprising: An end plate; a scroll blade formed on one side of the end plate; and a hub formed on the other side of the end plate, the hub portion including a substantially cylindrical wall portion including the wall portion An inner root portion on an inner side of the hub and an outer root portion on an outer side of the hub portion, wherein the other side of the end plate includes a thrust surface and a bottom surface located inside the hub portion, and the inner root portion The longitudinal direction of the scroll member is offset by a predetermined distance from the outer root toward the side of the scroll blade.

According to another aspect of an embodiment of the present disclosure, there is provided a scroll compressor including an orbiting scroll member as described above.

According to still another aspect of an embodiment of the present disclosure, there is provided a method of processing an orbiting scroll member, comprising providing an orbiting scroll member, the orbiting scroll member comprising: an end plate, a vortex formed on one side of the end plate a rotary vane, and a hub formed on the other side of the end plate, the hub portion including a substantially cylindrical wall portion including an inner root portion located inside the hub portion and located at the hub portion An outer root portion of the outer side, the other side of the end plate including a thrust surface and a bottom surface located inside the hub portion; at least removing material in a region of the bottom surface adjacent to the hub portion The inner root portion is offset by a predetermined distance from a side of the outer scroll portion toward the scroll blade in a longitudinal direction of the orbiting scroll member.

With the present disclosure, the fatigue fracture characteristics at the inner root portion of the hub portion of the orbiting scroll member are improved, and the processing method is simple and low in cost, and it is not necessary to redesign or even re-create a new type of orbiting scroll member.

DRAWINGS

The features and advantages of one or more embodiments of the present disclosure will become more readily understood from

Figure 1 is a longitudinal sectional view of a conventional scroll compressor;

2 and 2A are a cross-sectional view and a partial enlarged view, respectively, of a conventional orbiting scroll member.

3 and 3A are respectively a cross-sectional view and a partial enlarged view of an orbiting scroll member according to a first embodiment of the present disclosure;

4 and 4A are respectively a cross-sectional view and a partial enlarged view of a movable scroll member according to a second embodiment of the present disclosure;

5 and 5A are respectively a cross-sectional view of an orbiting scroll member according to a third embodiment of the present disclosure. Partial enlarged view;

6 and 6A are respectively a cross-sectional view and a partial enlarged view of an orbiting scroll member according to a fourth embodiment of the present disclosure;

Fig. 7 is a view showing a comparison of fatigue strength factors of the orbiting scroll member of the first embodiment of the present disclosure with respect to the orbiting scroll member shown in Fig. 2.

detailed description

The description of the various embodiments of the present disclosure is merely exemplary, and is not a limitation of the disclosure and its application or usage. The same reference numerals are used in the respective drawings to refer to the same components, and thus the construction of the same components will not be repeatedly described.

The overall configuration and operating principle of the scroll compressor will first be described with reference to FIG. As shown in FIG. 1, a scroll compressor 100 (hereinafter sometimes referred to as a compressor) generally includes a housing 110, a top cover 112 disposed at one end of the housing 110, and a bottom cover 114 disposed at the other end of the housing 110. And a partition 116 disposed between the top cover 112 and the housing 110 to partition the internal space of the compressor into a high pressure side and a low pressure side. The space between the partition 116 and the top cover 112 constitutes a high pressure side, and the space between the partition 116, the housing 110 and the bottom cover 114 constitutes a low pressure side. An intake joint 118 for sucking a fluid is provided on the low pressure side, and an exhaust joint 119 for discharging the compressed fluid is provided on the high pressure side. A motor 120 composed of a stator 122 and a rotor 124 is disposed in the housing 110. A drive shaft 130 is provided in the rotor 124 to drive a compression mechanism composed of the fixed scroll member 150 and the movable scroll member 160. The movable scroll member 160 includes an end plate 164, a hub portion 162 formed on one side of the end plate, and a spiral blade 166 formed on the other side of the end plate. The fixed scroll member 150 includes an end plate 154, a spiral blade 156 formed on one side of the end plate, and an exhaust port 152 formed at a substantially central position of the end plate. A series of compression chambers C1, C2, and C3 whose volume gradually decreases from the radially outer side to the radially inner side are formed between the spiral blade 156 of the fixed scroll 150 and the spiral blade 166 of the movable scroll 160. Wherein, the radially outermost compression chamber C1 is at the suction pressure, and the radially innermost compression chamber C3 is at the exhaust pressure. The intermediate compression chamber C2 is between the suction pressure and the discharge pressure, and is also referred to as a medium pressure chamber.

One side of the movable scroll member 160 is supported by an upper portion (i.e., a support portion) of the main bearing housing 140, and one end of the drive shaft 130 is supported by a main bearing 144 provided in the main bearing housing 140. One end of the drive shaft 130 is provided with an eccentric crank pin 132. A drive bearing DU (see Fig. 2) is usually provided inside the hub portion 162. An unloading bushing 142 is disposed between the eccentric crank pin 132 and the drive bearing DU. The eccentric crank pin 132 of the drive shaft 130 passes through the unloading bushing 142 and the drive shaft The DB drives the hub 162 of the orbiting scroll member 160 such that the orbiting scroll member 160 rotates relative to the fixed scroll member 150 (i.e., the central axis of the orbiting scroll member 160 wraps around the central axis of the scroll member 150). Rotation, but the orbiting scroll member 160 itself does not rotate about its central axis to achieve compression of the fluid. The above translational rotation is achieved by the cross slip ring 190 disposed between the fixed scroll member 150 and the movable scroll member 160. The fluid compressed by the fixed scroll member 150 and the orbiting scroll member 160 is discharged to the high pressure side through the exhaust port 152. In order to prevent the fluid on the high pressure side from flowing back to the low pressure side via the exhaust port 152 under certain circumstances, a check valve or exhaust valve 170 may be provided at the exhaust port 152.

Referring to FIGS. 2 and 2A, in the prior art orbiting scroll member 160, the hub portion 162 generally includes a substantially cylindrical wall portion W, and includes a root portion (hereinafter referred to as an inner root portion) located inside the wall portion W. IR and a root (hereinafter referred to as an outer root) OR located outside the wall portion W. The end plate 164 of the movable scroll member 160 includes a thrust surface T formed on one side of the hub portion 162 and a bottom surface B located inside the hub portion 162. 2 and 2A, the outer root portion OR is transitioned to the outer surface of the thrust surface T and the wall portion W by chamfering, and the inner root portion IR is transitioned to the inner side surface of the wall portion W by chamfering. The thrust surface T and the bottom surface B are in the same plane. When the orbiting scroll member shown in FIGS. 2 and 3 is applied to a larger capacity compressor platform, the driving load generated by the drive shaft 130 and the load generated by the press-fit of the bearing DU in the hub are under the action of the hub. Fatigue damage often occurs at the roots of the parts, especially at the inner root IR.

An orbiting scroll member according to a first embodiment of the present disclosure will be described below with reference to FIGS. 3 and 3A. The movable scroll member 160A includes an end plate 164, a hub portion 162 formed on one side of the end plate, and a spiral blade 166 formed on the other side of the end plate. The hub portion 162 generally includes a generally cylindrical wall portion W, and the wall portion W includes an inner root portion IR located inside the hub portion and an outer root portion OR located outside the hub portion. The end plate 164 of the movable scroll member 160A includes a thrust surface T formed on one side of the hub portion 162 and a corresponding thrust surface of the main bearing housing 140 and a bottom surface B located inside the hub portion 162. Viewed from the cross-sectional views of Figures 3 and 3A, the outer root OR preferably transitions to the outer surface of the thrust surface T and the wall portion W by chamfering, while the inner root portion IR preferably transitions to the inner side of the wall portion W by chamfering. . In the present embodiment, the inner root portion IR is designed to be offset by a predetermined distance h1 with respect to the side of the outer root portion OR toward the scroll blade in the longitudinal direction X-X of the orbiting scroll member. Preferably, the inner root portion IR is offset relative to the outer root portion OR by removing the material of the entire bottom surface B such that the height difference between the bottom surface B and the thrust surface T is equal to the predetermined distance h1, that is, the thrust surface T and the bottom surface B are at Different planes. In other words, the entire bottom surface B is recessed toward the side of the scroll blade 166 with respect to the thrust surface T, for example, by a predetermined height h1. Such a recess can perform any machining such as turning on the bottom surface B of the movable scroll member of the specific model shown in Fig. 2 to remove a certain amount of material from the end plate 164. Now. For a different type of orbiting scroll member, the predetermined height h1 of the recess may be changed according to a specific situation, for example, the predetermined height h1 may be set to be 1/10 to 1/5 of the thickness h2 of the end plate 164. In the example shown in FIG. 3, the predetermined height is set to 3 mm.

Referring to FIG. 3A, by shifting the position of the inner root portion IR from the original position P1 of the same level as the thrust surface T to the current position P2 (between the position P1 and the position P2 corresponding to the height h1), the inner portion can be effectively lowered. Stress distribution of fatigue failure at the root IR. Through numerical simulation, the inner root IR is usually subjected to tensile stress, while the outer root OR is usually subjected to compressive stress. Due to the above change in the position of the inner root portion IR, the tensile stress at the inner root portion IR which causes fatigue fracture is effectively lowered, and the compressive stress at the outer root portion OR is slightly increased, but the fatigue of the metal material for manufacturing the orbiting scroll member This is still very advantageous in terms of damage characteristics.

Figure 7 illustrates an improvement in the fatigue failure strength of the embodiment of Figure 3 relative to the particular example of Figure 2. The dotted line Goodman FRF=1 in the figure indicates a judgment line in which the fatigue strength factor is equal to 1, and the broken line Goodman FRF=1.2 indicates a judgment line in which the fatigue strength factor is equal to 1.2. In the figure, the horizontal axis represents the average stress (= (maximum stress + minimum stress) / 2), and the vertical axis represents the stress amplitude (= (maximum stress - minimum stress) / 2). The black triangle indicates the fatigue strength factor at the inner root of Fig. 2, and the black diamond indicates the fatigue strength factor at the inner root of Fig. 3. The gray triangle indicates the fatigue strength factor at the outer root of Fig. 2, and the gray diamond indicates the fatigue strength factor at the outer root of Fig. 3. As can be seen from FIG. 7, the fatigue strength factor (approximately 1.28) at the inner root of the orbiting scroll member according to an embodiment of the present disclosure is relative to the fatigue strength factor at the inner root of the orbiting scroll member of FIG. 2 (approximately 1.05) ) A large shift toward the direction in which the fatigue strength factor is larger (approximately 21.9% improvement), that is, fatigue damage is less likely to occur. In contrast, the fatigue strength factor at the outer root portion of the orbiting scroll member of the embodiment of the present disclosure does not significantly change, and satisfactory fatigue fracture strength can still be ensured.

The principle of the embodiments of the present disclosure is to optimize the stress distribution of the entire hub by removing the material to change the position of the inner root of the hub, thereby satisfying the strength requirement of the movable scroll component, rather than increasing the material in the conventional design (for example, increasing The thickness of the hub, etc., to meet the strength requirements of the orbiting scroll component, so that the machining is simple and cost-effective in actual operation, and there is no need to redesign or manufacture a new type of orbiting scroll component, thereby reducing the required spare parts for stock. Quantity.

A second embodiment according to the present disclosure will be described below with reference to FIGS. 4 and 4A. Unlike the first embodiment, the inner root portion IR is offset relative to the outer root portion OR by removing material in the region of the bottom surface B adjacent to the hub portion 162. Thereby, the removed portion of the bottom surface B forms an annular groove C having a horizontal bottom CA. The lowest point of the annular groove C (i.e., the horizontal bottom CA of the annular groove) may be offset from the outer root OR by the predetermined distance h1 in the longitudinal direction. Similarly, In the third embodiment according to the present disclosure described in FIGS. 5 and 5A, the annular groove C has an inclined bottom portion CB. In the fourth embodiment according to the present disclosure described in FIGS. 6 and 6A, the annular groove C has a bottom CC which is curved (for example, arcuate). Since it is from the example shown in FIG. 2, the unremoved portion of the bottom surface B can still be in the same plane as the thrust surface T.

In addition to the advantageous effects of the first embodiment, the second to fourth embodiments have the following additional advantageous effects. Since only a part of the material of the bottom surface B is removed, the processing can be made simpler. Since the material of the substantially central portion of the bottom surface B is maintained, the strength of the portion is retained. Particularly for the fourth embodiment, since the curved bottom portion CC is employed, the stress distribution at the inner root portion IR is more optimized, and fatigue damage is less likely to occur.

Although the invention has been described above with reference to an orbiting scroll component applied to a low pressure side scroll compressor, those skilled in the art will appreciate that the principles of the present invention can also be applied to an orbiting scroll component of a high pressure side scroll compressor and obtained The same beneficial effect.

Although the processing method performed on the example shown in FIG. 2 has been described above, that is, at least the material in the region of the bottom surface B adjacent to the hub portion 162 is removed such that the inner root portion IR is relatively opposed to the longitudinal direction XX of the movable scroll member. The outer root OR is offset from the side of the scroll blade by a predetermined distance h1, but it will be understood by those skilled in the art that, based on the method taught by the present disclosure, the movable scroll member can also be designed and manufactured when the orbiting scroll member is designed and manufactured. The inner root of the hub is designed and manufactured to be offset by a predetermined distance h1 from the longitudinal direction of the orbiting scroll member with respect to the outer root toward the scroll blade, thereby making the orbiting scroll member thus designed and manufactured more resistant Fatigue damage performance can be applied not only to the capacity it was originally designed for, but also to larger capacity compressors.

Although the various embodiments of the present invention have been described in detail herein, it is understood that the invention The skilled person implements other variations and variants. All such variations and modifications are intended to fall within the scope of the invention. Moreover, all of the components described herein can be replaced by other technically equivalent components.

Claims (10)

1. An orbiting scroll component (160A, 160B, 160C, 160D) comprising:

   End plate (164),

   a scroll blade (166) formed on one side of the end plate, and

   a hub portion (162) formed on the other side of the end plate, the hub portion including a substantially cylindrical wall portion (W) including an inner root portion (IR) located inside the hub portion and An outer root (OR) located outside the hub,

   Wherein the other side of the end plate includes a thrust surface (T) and a bottom surface (B) located inside the hub portion, and

   The inner root portion is offset by a predetermined distance (h1) along a longitudinal direction (X-X) of the orbiting scroll member with respect to a side of the outer root portion facing the scroll blade.
2. The movable scroll member according to claim 1, wherein said predetermined distance is 1/10 to 1/5 of said end plate thickness (h2).
3. The orbiting scroll member according to claim 1, wherein said predetermined distance is 3 mm.
4. The orbiting scroll member according to any one of claims 1 to 3, wherein the inner root portion is offset with respect to the outer root portion by removing material of the entire bottom surface, such that the bottom surface and the thrust The height difference between the faces is equal to the predetermined distance.
5. The orbiting scroll member according to any one of claims 1 to 3, wherein the inner root portion is offset from the outer root portion by removing material in a region of the bottom surface adjacent to the hub portion The removed portion of the bottom surface forms an annular groove (C) whose lowest point is offset by the predetermined distance relative to the outer root in the longitudinal direction.
6. The orbiting scroll member according to claim 5, wherein the annular groove is formed to have a horizontal bottom (CA), a sloped bottom (CB), or a curved bottom (CC).
7. The movable scroll member according to claim 5, wherein the unremoved portion of the bottom surface and the thrust surface are in the same plane.
8. A scroll compressor comprising the orbiting scroll member according to any one of claims 1-7.
9. A method of processing an orbiting scroll component, including

   Providing an orbiting scroll member, the orbiting scroll member comprising: an end plate, a scroll blade formed on one side of the end plate, and a hub formed on the other side of the end plate, the hub portion including a cylindrical wall portion including an inner root portion located inside the hub portion and an outer root portion located outside the hub portion, the other side of the end plate including a thrust surface and located at the The bottom surface of the inside of the hub,

   Removing at least a material in a region of the bottom surface adjacent to the hub such that the inner root portion is offset from a side of the scroll portion toward the scroll blade in a longitudinal direction of the orbiting scroll member Move the predetermined distance.
10. The processing method according to claim 9, wherein the material of the bottom surface is removed by machining.

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