CN116950894A - Scroll member, compression mechanism and scroll compressor - Google Patents

Abstract

The present invention provides a scroll member of a compression mechanism, comprising: an end plate and a scroll blade formed at one side of the end plate, the scroll blade extending from inside to outside in a line direction of a spiral shape from a substantially central position of the end plate, wherein the scroll blade includes a compression section and an extension section connected to each other, the compression section being located inside the extension section in the line direction, the compression section being adapted to construct a chamber for a compression operation, the radial thickness of the extension section being smaller than the radial thickness of the compression section, the extension section being formed with a material removal portion, the chamber constructed by the extension section being capable of communicating with a low pressure environment outside the compression mechanism through the material removal portion. The invention also provides a compression mechanism. The invention also provides a scroll compressor. The scroll member, the compression mechanism including the scroll member according to the present invention has improved fatigue resistance while the original displacement and pressure ratio remain unchanged.

Description

Scroll member, compression mechanism and scroll compressor

Technical Field

The present invention relates to a scroll member, and in particular, to a scroll member having high fatigue resistance. In addition, the invention also relates to a compression mechanism comprising the scroll component and a scroll compressor comprising the compression mechanism.

Background

Scroll compressors generally include a housing, a driving mechanism accommodated in the housing, a compression mechanism driven by the driving mechanism, a main bearing housing supporting the compression mechanism, and the like. Compression mechanisms generally include intermeshing orbiting and non-orbiting scrolls to form a series of compression chambers therebetween for compression. When the drive shaft of the drive mechanism rotates, the orbiting scroll can be driven via the crank pin of the drive shaft so that the orbiting scroll makes translational rotation with respect to the fixed scroll. In other words, the axis of the orbiting scroll orbits in a circular orbit relative to the axis of the non-orbiting scroll, but both the orbiting and non-orbiting scrolls themselves do not rotate about their respective axes.

In the process of translational motion of the orbiting scroll and the fixed scroll, the orbiting scroll blade and the fixed scroll blade are in contact seal in the radial direction and bear lateral contact force. The contact logarithm between the movable vortex blade and the fixed vortex blade varies between 4 pairs and 6 pairs in the process of one circle of movable vortex translation. Therefore, in the case where the total lateral contact force is substantially constant, when the contact pair number between the movable scroll blade and the fixed scroll blade is 4 pairs, the lateral contact force shared at each contact pair is the largest, and at this time, the scroll blade is liable to fail at the contact pair or even the scroll blade is completely broken. Particularly for large variable frequency compressors, the occurrence of vortex blade breakage is particularly easy when the rotational speed exceeds, for example, 6000 RPM.

Therefore, there is a need for a design that improves fatigue strength of scroll blades to address the problem of failure of scroll blades at higher rotational speeds in scroll compressors, particularly in large variable frequency scroll compressors.

Disclosure of Invention

The accompanying drawings are included to provide a general overview of the invention and are not intended to provide a complete disclosure of the full scope of the invention or all-character thereof.

It is an object of the present invention to provide a scroll member, a compression mechanism including the scroll member, and a scroll compressor including the compression mechanism, in which a scroll blade of the scroll member includes an extension section capable of making contact with a scroll blade of the scroll member, not only capable of increasing the number of contact pairs between two scroll blades of the scroll member, which are engaged with each other, thereby effectively reducing a radial load received at each contact pair, thereby improving fatigue resistance of the scroll member, reducing a failure risk of the scroll member, while substantially not affecting a displacement and a pressure ratio of the compression mechanism.

Another object of the present invention is to provide a scroll member, a compression mechanism including the same, and a scroll compressor including the compression mechanism, in which a scroll blade of the scroll member has not only high fatigue resistance but also no significant increase in power consumption of the scroll member.

It is still another object of the present invention to provide a scroll member, a compression mechanism including the same, and a scroll compressor including the compression mechanism, which are simple in structure, easy to manufacture and process, and inexpensive.

According to an aspect of the present invention, there is provided a scroll member of a compression mechanism, comprising: an end plate and a scroll blade formed at one side of the end plate, the scroll blade extending from inside to outside in a line direction of a spiral shape from a substantially central position of the end plate, wherein the scroll blade includes a compression section and an extension section connected to each other, the compression section being located inside the extension section in the line direction, the compression section being adapted to construct a chamber for a compression operation, the radial thickness of the extension section being smaller than the radial thickness of the compression section, the extension section being formed with a material removal portion, the chamber constructed by the extension section being capable of communicating with a low pressure environment outside the compression mechanism through the material removal portion.

Optionally, the scroll member is a non-orbiting scroll further comprising a peripheral wall disposed about the scroll blade, the extension section being disposed in close proximity to a radially inner surface of the peripheral wall.

Optionally, the extension section is provided in the region of the peripheral wall where the rigidity is greatest.

Optionally, a suction window for allowing the working fluid to enter the compression mechanism is formed on the outer peripheral wall, and the extension section extends in the line direction to the suction window, so that in a case where an innermost contact point of the scroll blade in the line direction has not been out of contact with the compression mechanism while the compression mechanism is in operation, an outermost contact point of the scroll blade in the line direction is already in contact with the scroll blade.

Alternatively, the material removing portion is configured in a form in which a material is removed from an upper or lower portion of the extension section in the axial direction such that the scroll blade has a stepped shape in the axial direction.

Optionally, the extending section extends at an angle of 20 ° or more and less than 120 ° in the direction of the profile.

Optionally, the material removal portion is configured as one or more apertures penetrating the extension section in a thickness direction thereof, the apertures being aligned and communicating with through holes formed on the outer peripheral wall in direct communication with a low pressure environment external to the compression mechanism.

Alternatively, the apertures are arranged in the direction of the profile or in the axial direction, the apertures being a plurality of round holes or the apertures being a single elongate slot.

Optionally, the material removal portion is configured as an elongated slot extending through the extension section in the thickness direction of the extension section, the elongated slot extending in the profile direction up to the outer end of the extension section.

Alternatively, the elongated groove communicates with a communication groove formed on the outer peripheral wall, the communication groove extending outward from an outer side end of the elongated groove, a suction window for allowing the working fluid to enter the compression mechanism being formed on the outer peripheral wall, the communication groove being configured as a through hole in direct communication with a low pressure environment outside the compression mechanism or as a half groove recessed from a radially inner side surface of the outer peripheral wall in communication with the suction window.

According to another aspect of the present invention there is provided a compression mechanism comprising a non-orbiting scroll and an orbiting scroll engaged with each other to form a series of compression chambers between the non-orbiting and orbiting scrolls, wherein the non-orbiting or orbiting scrolls are configured as scroll members as described above.

Alternatively, an extension section of the wrap vane of one of the non-orbiting scroll and the orbiting scroll can be brought into contact with the other of the non-orbiting scroll and the orbiting scroll, but the extension section is not used to form a compression chamber.

According to yet another aspect of the present invention, there is provided a scroll compressor, wherein the scroll compressor includes the compression mechanism described above.

In general, the scroll member, the compression mechanism including the scroll member, and the scroll compressor including the compression mechanism according to the present invention bring about at least one of the following advantageous effects: since the scroll member has the scroll blade provided with the extension section which can increase the contact point between the scroll blade and the scroll blade engaged therewith, thereby improving the fatigue resistance of the scroll member, particularly for a large variable frequency compressor having a rotational speed exceeding 6000RPM, for example; the extension section of the scroll blade is provided with a material removing part, so that the extension section is prevented from participating in compression, and the influence on the displacement and the pressure ratio of the compression mechanism is reduced as much as possible; the extension section of the scroll blade is directly communicated with the external low-pressure environment of the compression mechanism through a material removing part (such as a hole or a groove), so that the increase of compression power consumption is avoided, and the efficiency of the compressor is further ensured; the vortex component with the extension section has the advantages of simple structure, easy processing and manufacturing, low production cost and wide application range.

Drawings

The features and advantages of one or more embodiments of the invention will become more readily apparent from the following description with reference to the accompanying drawings. The drawings provided herein are for illustration purposes only and are not intended to limit the scope of the present invention in any way. The figures are not drawn to scale, but rather some features may be exaggerated or minimized to show details of particular components. In the drawings:

FIG. 1a is a top perspective view of a non-orbiting scroll according to a first embodiment of the invention;

FIG. 1b is another angled top perspective view of a non-orbiting scroll according to a first embodiment of the invention;

FIG. 2 is a longitudinal cross-sectional view of a non-orbiting scroll according to a first embodiment of the present invention;

fig. 3a and 3b show radial cross-sectional views of a compression mechanism according to a first embodiment of the present invention at a time T1 immediately after start of discharge and at a time T2 rotated 180 ° after start of discharge, respectively;

fig. 4a and 4b show radial cross-sectional views of a compression mechanism in a comparative example at a time T1 immediately after start of exhaust and at a time T2 rotated 180 ° after start of exhaust, respectively;

FIG. 5 is a top perspective view of a non-orbiting scroll according to a second embodiment of the invention;

FIG. 6 is a radial cross-sectional view of a compression mechanism according to a second embodiment of the present invention;

FIG. 7 is a top perspective view of a non-orbiting scroll according to a third embodiment of the invention;

fig. 8a and 8b show radial cross-sectional views of a compression mechanism according to a third embodiment of the present invention at a time T1 immediately after start of discharge and at a time T2 rotated 180 ° after start of discharge, respectively;

FIG. 9 is a top perspective view of a non-orbiting scroll according to a fourth embodiment of the invention;

FIG. 10 is a top perspective view of a non-orbiting scroll according to a fifth embodiment of the invention;

FIG. 11a is a top perspective view of a non-orbiting scroll according to a sixth embodiment of the invention; and

fig. 11b is a radial cross-sectional view of a non-orbiting scroll according to a sixth embodiment of the present invention.

Detailed Description

The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings, which are merely exemplary and are not to be construed as limiting the invention and its application.

In general, a scroll compressor (hereinafter, sometimes referred to as a compressor) includes a housing, a compression mechanism composed of a fixed scroll and an orbiting scroll, a main bearing housing, and a drive shaft and a motor for driving the compression mechanism, etc. An eccentric crank pin is provided at one end of the drive shaft adjacent the orbiting scroll. An eccentric crank pin is inserted into the boss of the orbiting scroll, an unloading bushing may be provided between the eccentric crank pin and the boss to provide radial flexibility to the compression mechanism, and a drive bearing may be provided between the unloading bushing and the boss of the orbiting scroll. By driving of the motor, the drive shaft makes the orbiting scroll perform translational movement (i.e., the central axis of the orbiting scroll moves around the central axis of the non-orbiting scroll, but the orbiting scroll itself does not rotate around the central axis of itself) with respect to the non-orbiting scroll via the eccentric crank pin, the unloading bushing, and the drive bearing to achieve compression of the working fluid. The above-mentioned orbiting motion is realized by a cross slip ring.

The orbiting scroll includes an end plate, a hub formed at one side of the end plate, and a spiral wrap vane 90 formed at the other side of the end plate (see, e.g., fig. 3 a). Referring to fig. 1a and 1b, a non-orbiting scroll 100 according to a first embodiment of the present invention includes an end plate 12, a spiral wrap vane 10 formed at one side of the end plate 12, and a discharge port 18 formed at a substantially central position of the end plate 12. A series of chambers for compression operation (hereinafter, simply referred to as compression chambers) whose volumes gradually decrease from the radially outer side to the radially inner side are formed between the scroll blade 10 of the fixed scroll 100 and the scroll blade 90 of the movable scroll. The fixed scroll 100 further includes an outer circumferential wall 14 provided around the scroll blade 10, and a suction window 16 is provided at the outer circumferential wall 14 and/or the end plate 12 (in fig. 1a, the suction window 16 includes a portion formed at the outer circumferential wall 14 and a portion formed at the end plate 12), so that a working fluid enters the compression chamber through the suction window 16 and is discharged through the discharge port 18 after being compressed by the compression chamber.

Specifically, referring to fig. 1a and 1b, the scroll blade 10 extends from the substantially central position of the end plate 12 from the inside toward the outside in the direction of the spiral-shaped line, that is, the innermost end 11 of the scroll blade 10 is located at the substantially central position of the end plate 12 (in the vicinity of the exhaust port 18), and the outermost end of the scroll blade 10 opposite to the innermost end 11 is located in the vicinity of the radially outer periphery of the end plate 12. In its line direction, scroll blade 10 includes compression section 102 and extension section 104 connected to each other, compression section 102 being located inside extension section 104. In this context, compression section 102 refers to a section of the scroll blade adapted to configure a chamber for a compression operation, i.e., compression section 102 meshes with orbiting scroll wrap 90 to form a compression chamber. The extension section 102 continues to extend outward in the line direction from the outermost end of the compression section 102 in the line direction, and thus the extension section 104 and a portion of the compression section 102 together constitute the outermost ring of the scroll blade 10. The outer peripheral wall 14 surrounds the outermost ring of blades of the scroll blade 10.

As shown in fig. 2, the extension section 104 is not configured to extend over the entire axial height of the compression section 102, but includes a material removal 107. Specifically, a lower portion of the extension section 104 in the axial direction is material-removed to form a material-removed portion 107, and an upper portion 105 of the extension section 104 in the axial direction extends from the compression section 102 to the suction window 16. That is, the extension section 104 has an axial step 103 in the axial direction. When orbiting scroll wrap vane 90 engages extension section 104 (i.e., upper portion 105 of extension section 104) to form a chamber, the chamber is maintained in communication with suction louver 16 by material removal 107 so as not to compress the working fluid, whereby the extension section does not affect the displacement and pressure ratio of the compression mechanism (i.e., the displacement and pressure ratio of the compression mechanism is associated with the compression section only) nor does it create additional compression power consumption. Preferably, the radially inner surface of the extension section 104 (i.e. the upper portion 105 of the extension section 104) is flush with the radially inner surface of the compression section 102 and maintains the same machining precision, thereby ensuring smooth orbiting of the orbiting scroll relative to the non-orbiting scroll and ensuring radial support of the non-orbiting scroll to the orbiting scroll.

As shown in fig. 1a and 1b, the thickness of the extension section 104 in the radial direction (i.e., the thickness of the upper side portion 105 of the extension section 104) is smaller than the thickness of the compression section 102 in the radial direction, so that a line-direction step 13 is formed at the junction of the extension section 104 and the radially outer surface of the compression section 102. Thus, the extension section 104 may be disposed against the radially inner surface of the outer peripheral wall 14 to provide radial support to the orbiting scroll when the radially inner surface of the extension section 104 (i.e., the upper portion 105 of the extension section 104) comes into contact with the radially outer surface of the orbiting scroll blade 90.

The operation and advantages of the compression mechanism according to the first embodiment of the present invention will be described below with reference to fig. 3a, 3b in combination with the compression mechanism of the comparative example shown in fig. 4a, 4 b.

Fig. 3a and 3b show radial cross-sectional views of a compression mechanism according to a first embodiment of the present invention at a time T1 immediately after start of discharge and at a time T2 rotated 180 ° after start of discharge, respectively. During the translational rotation of the orbiting scroll and the fixed scroll, contact occurs between the orbiting scroll wrap 90 and the fixed scroll wrap 10 of the fixed scroll 100, the number and position of contact points between the two are continuously changed along with the movement of the orbiting scroll, and the number of contact points between the two is generally in the range of 4 to 6. Obviously, with the compression mechanism operating conditions unchanged, the total lateral support force between orbiting scroll wrap 90 and non-orbiting scroll wrap 10 is substantially unchanged, and the smaller the number of contact points, the greater the radial load shared at a single contact point. When the number of contact points between the two is 4, the radial load shared by the single contact point is the largest, and the vortex component is most likely to fail at the moment. As at time T1 immediately after the start of the discharge of the compression mechanism shown in fig. 3a, the innermost contact point of the orbiting scroll wrap 90 with the non-orbiting scroll wrap 10 of the non-orbiting scroll wrap 100 is just separated, and the orbiting scroll wrap 90 with the non-orbiting scroll wrap 10 of the non-orbiting scroll wrap 100 has four contact points as shown by the circled portions in the figure, and the total lateral contact force between the orbiting and non-orbiting scrolls 100 is provided by these four contact points in common. As also shown in fig. 3b, at time T2 when the orbiting scroll is orbiting 180 ° after the compression mechanism starts exhausting, the orbiting scroll wrap 90 and the non-orbiting scroll wrap 10 of the non-orbiting scroll wrap 100 have five contact points as shown by the circled portions in the figure, wherein four contact points near the inner side between the orbiting scroll wrap 90 and the non-orbiting scroll wrap 10 of the non-orbiting scroll wrap 100 occur between the orbiting scroll wrap 90 and the compression section 102 of the non-orbiting scroll wrap 10 of the non-orbiting scroll wrap 100, and the outermost contact point (as shown by circle X in fig. 3 b) of the orbiting scroll wrap 90 and the non-orbiting scroll wrap 10 of the non-orbiting scroll wrap 100 is located in the extension section 104 of the non-orbiting scroll wrap 100 wrap 10. That is, at this point, the orbiting scroll wrap 90 is in contact with the upper portion 105 of the extension section 104 of the fixed scroll wrap 10, providing sufficient radial support for the orbiting scroll wrap 90 by the upper portion 105 and the peripheral wall 14 (which may also include the outer structure of the peripheral wall) against which it abuts.

In contrast, in the compression mechanism of the comparative example shown in fig. 4a and 4b, the scroll member, particularly the wrap blade 10 'of the non-orbiting scroll 100', is not provided with an extension section (i.e., includes only a compression section). At a time T1 immediately after the start of the discharge of the compression mechanism shown in fig. 4a, the innermost contact point of the scroll blade 90 'of the orbiting scroll with the scroll blade 10' of the non-orbiting scroll 100 'is just separated, and the scroll blade 90' of the orbiting scroll with the scroll blade 10 'of the non-orbiting scroll 100' has four contact points as shown by the circled portions in the figure, and the total lateral contact force between the orbiting scroll and the non-orbiting scroll 100 is commonly provided by these four contact points. The radial load distribution of the compression mechanism of the invention is now not significantly different from that shown in fig. 3 a. However, at time T2 when the orbiting scroll is made to orbit 180 ° after the compression mechanism starts to discharge as shown in fig. 4b, the orbiting scroll wrap 90 and the fixed scroll wrap 10' of the fixed scroll wrap 100' have only four contact points as shown by the solid circle portion in the drawing, wherein since the fixed scroll wrap 10' of the fixed scroll wrap 100' does not include an extension section, contact does not occur between the outermost ring of the orbiting scroll wrap 90 and the fixed scroll wrap 10 of the fixed scroll wrap 100, i.e., at a position where contact can occur in the compression mechanism according to the present invention as shown in fig. 3b (as shown by the broken line circle X ' in fig. 4 b). Therefore, with respect to this time T2, the contact point between the scroll blade 90 of the orbiting scroll and the scroll blade 10 of the non-orbiting scroll 100 according to the first embodiment of the present invention is increased by one as compared to the comparative example, thereby reducing the radial load shared at a single contact point, thereby improving the fatigue strength of the scroll blade, and effectively avoiding the failure of the scroll member.

According to the fixed scroll of the first embodiment of the invention, due to the design of the extension section, the moment that the radial contact points between the scroll blades of the fixed scroll and the scroll blades of the movable scroll are four can be effectively reduced, and the outer peripheral wall of the fixed scroll is utilized to provide radial support for the movable scroll blades, so that the fatigue strength of the scroll part is improved, and the failure risk of the scroll part is reduced as far as possible. Through experiments, the fatigue resistance of the non-orbiting scroll according to the first embodiment of the present invention was improved by 18%. On the other hand, since the extension section includes a material removal portion communicating with the suction window, the extension section does not affect the original displacement and pressure ratio of the compression mechanism, nor does it cause additional power consumption.

Preferably, in the first embodiment according to the present invention, the extension section 104 is provided in a region where the rigidity of the outer peripheral wall of the non-orbiting scroll is maximum, for example, the region where the rigidity of the outer peripheral wall of the non-orbiting scroll is maximum refers to a region where the radial thickness of the outer peripheral wall is maximum. In this region, the radial thickness of the peripheral wall is significantly greater than the radial thickness of the compression section 102 of the wrap of the non-orbiting scroll, so that the contact point between the extension section 104 and the orbiting scroll can take up more lateral support force than the other contact points between the compression section 102 and the orbiting scroll, thereby improving the fatigue resistance of the scroll.

Although shown in fig. 1a and 1b as extending section 104 extending from the outermost end of compression section 102 in a molded line direction up to suction louver 16, extending section 104 may extend a predetermined distance in a molded line direction spaced apart from suction louver 16. Preferably, in the first embodiment according to the present invention, the angle at which the extension section 104 extends in the direction of the line is 20 ° or more and 120 ° or less, preferably 24 ° or more, and more preferably 60 ° or more, so as to ensure that the moment at which fatigue failure of the scroll blade occurs (i.e., the moment at which the contact pair between the scroll blade of the orbiting scroll and the scroll blade of the fixed scroll is 4) is minimized.

The material removing portion of the extension section of the scroll blade may be located at a lower side of the extension section in the axial direction or may be located at an upper side of the extension section in the axial direction. Fig. 5 and 6 show a non-orbiting scroll 200 and a compression mechanism including the orbiting scroll and the non-orbiting scroll 200, respectively, according to a second embodiment of the present invention. Therein, similar to the first embodiment according to the present invention, the fixed scroll 200 includes an end plate 22, a spiral wrap blade 20 formed at one side of the end plate 22, and an outer peripheral wall 24 provided around the wrap blade 20. Scroll blade 20 extends from the substantially central position of end plate 22 from the inside toward the outside in the direction of the spiral-shaped line, and in the extending direction of the line thereof, scroll blade 20 includes compression section 202 and extension section 204 connected to each other. Unlike the first embodiment according to the present invention, the upper portion of the extension section 204 in the axial direction is removed of material to form a material removal portion 207, and the lower portion 205 of the extension section 204 in the axial direction extends from the compression section 202 to the suction window at the outer peripheral wall 24. That is, the extension section 204 has an axial step 203 in the axial direction.

In the second embodiment according to the present invention, the non-orbiting scroll 200 has an extension section designed to increase contact between the orbiting scroll wrap and the orbiting scroll wrap by the lower portion 205 on the one hand, thereby providing more radial support to the orbiting scroll wrap and effectively reducing the risk of failure of the scroll member, and on the other hand, to communicate with the suction window by the material removal portion 207, avoiding the extension section from affecting the original displacement and pressure ratio of the compression mechanism, and avoiding the generation of additional power consumption. That is, the second embodiment according to the present invention has advantages and effects similar to those of the first embodiment.

In addition, preferably, referring to fig. 6, in the case where the extension section 204 of the fixed scroll 200 extends from the outermost end of the compression section 202 in the line direction for a long distance, particularly, up to the suction window, the innermost contact points A1, A2 in the line direction of the scroll blades of the fixed scroll 200 and the scroll blades 90 of the movable scroll have not been separated from the separated state, and the outermost contact points B in the line direction of the two have been in the contact state. Thus, more contact points can be generated between the wrap blades 20 of the fixed scroll 200 and the wrap blades 90 of the movable scroll during the orbiting motion of the movable scroll, thereby further reducing radial load at a single contact point and improving fatigue strength of the scroll member.

Fig. 7 shows a non-orbiting scroll 300 according to a third embodiment of the present invention, wherein, similar to the first embodiment of the present invention, the non-orbiting scroll 300 includes an end plate 32, a spiral wrap 30 formed at one side of the end plate 32, and a peripheral wall 34 disposed around the wrap 30, and a suction window is provided at the peripheral wall 34 and/or the end plate 32. The scroll blade 30 extends from the substantially central position of the end plate 32 from the inner side toward the outer side in the direction of the spiral-shaped line, and in the extending direction of the line thereof, the scroll blade 30 includes a compression section 302 and an extension section 304 connected to each other. The thickness of the extension section 304 in the radial direction is smaller than the thickness of the compression section 302, so that a line-direction step 33 is formed at the junction of the extension section 304 and the radially outer surface of the compression section 302. Thus, the extension segment 304 may be disposed against the radially inner surface of the peripheral wall 34 to provide radial support when the extension segment 304 is brought into contact with the orbiting scroll blade 90.

Unlike the first embodiment according to the invention, the extension section 304 is configured to extend over the entire height of the compression section 302, i.e. the extension section 304 is flush with the compression section 302 and has the same axial dimensions, the radially inner surface of the extension section 304 and the radially inner surface of the compression section 302 have the same machining precision, both together constituting a smooth surface extending in the profile direction. The extension section 304 comprises one or more apertures 306 extending through the entire extension section 304 in its thickness direction, for example three apertures 306 shown in fig. 7 as being arranged along the extension direction of the profile. These apertures 304 constitute material removal portions of the extension sections 304. The aperture 306 is aligned with and communicates with a through hole formed in the peripheral wall 34. When orbiting scroll wrap vane 90 engages extension segment 304 to form a chamber (see, e.g., FIG. 8 a), the chamber is in direct communication with the low pressure environment external to the compression mechanism by passing through aperture 306 at extension segment 304 and a through hole formed at peripheral wall 34. In other words, the aperture 306 at the extension section 304 and the through-hole formed at the outer peripheral wall 34 together form a communication channel that communicates the chamber configured by the extension section 304 with the external environment of the compression mechanism. Thus, the chambers configured by extension section 304 do not compress the working fluid, thereby not affecting the displacement and pressure ratio of the compression mechanism (i.e., the displacement and pressure ratio of the compression mechanism is associated with the compression section only) nor generating additional compression power consumption.

The operation and advantages of the compression mechanism according to the third embodiment of the present invention will be described with reference to fig. 8a and 8 b.

Fig. 8a and 8b show radial cross-sectional views of a compression mechanism according to a third embodiment of the present invention at a time T1 immediately after start of discharge and at a time T2 rotated 180 ° after start of discharge, respectively. During the translational rotation of the orbiting scroll and the fixed scroll, contact occurs between the orbiting scroll wrap 90 and the fixed scroll wrap 30 of the fixed scroll 300, the number and position of contact points between the two are continuously changed along with the movement of the orbiting scroll, and the number of contact points between the two is generally in the range of 4 to 6. As at time T1 immediately after the start of the discharge of the compression mechanism shown in fig. 8a, the innermost contact point of the orbiting scroll wrap 90 with the non-orbiting scroll wrap 30 of the non-orbiting scroll 300 is just separated, and the orbiting scroll wrap 90 with the non-orbiting scroll wrap 30 of the non-orbiting scroll 300 has four contact points as shown by the circled portions in the figure, and the total lateral contact force between the orbiting and non-orbiting scrolls 300 is provided by these four contact points in common. As also shown in fig. 8b, at time T2 when the orbiting scroll is orbiting 180 ° after the compression mechanism starts exhausting, the orbiting scroll wrap 90 and the non-orbiting scroll wrap 30 of the non-orbiting scroll 300 have five contact points as shown by the circled portions in the figure, wherein four contact points near the inner side of the orbiting scroll wrap 90 and the non-orbiting scroll wrap 30 of the non-orbiting scroll 300 occur between the compression sections 302 of the orbiting scroll wrap 90 and the non-orbiting scroll wrap 30, and the outermost contact point of the orbiting scroll wrap 90 and the non-orbiting scroll wrap 30 of the non-orbiting scroll 300 (as shown by the circle X in fig. 8 b) is located in the extension section 304 of the non-orbiting scroll wrap 300 wrap 30. That is, at this point, the orbiting scroll wrap 90 is in contact with the radially inner side surface of the extension section 304 of the wrap 30 of the non-orbiting scroll 300, providing sufficient radial support for the orbiting scroll wrap 90 through the extension section 304 and the outer peripheral wall 34 against which the extension section 304 abuts. At the same time, the chamber formed between the extension section 304 of the non-orbiting scroll and the orbiting scroll wrap 90 communicates with the external low pressure environment of the compression mechanism by traversing the aperture 306 of the extension section 304 and the through holes in the peripheral wall 34 in the thickness direction of the extension section 304, thereby avoiding additional compression of the working fluid by the chamber.

According to the fixed scroll of the third embodiment of the invention, due to the design of the extension section, the time when four contact points between the movable scroll and the fixed scroll are provided can be effectively reduced, and radial support is provided for the movable scroll blade by utilizing the peripheral wall and the outer side structure of the fixed scroll, so that the fatigue strength of the scroll part is improved, and the failure risk of the scroll part is reduced as far as possible. On the other hand, since the extension section includes a material removal portion that is in direct communication with the external environment of the compression mechanism, the extension section does not affect the displacement and pressure ratio that would otherwise be the case for the compression mechanism. In addition, since the extension section extends in the entire height direction of the compression section, the contact area between the wrap vane of the orbiting scroll and the wrap vane of the non-orbiting scroll in the extension section is increased, thereby providing more sufficient radial support of the wrap vane of the orbiting scroll. In a third embodiment of the invention, the contact point at the extension section is able to share 40% of the total lateral support force. Through experiments, the fatigue resistance of the non-orbiting scroll according to the third embodiment of the present invention was improved by 20%.

Preferably, in the third embodiment of the present invention, the extension section 304 of the non-orbiting scroll 300 does not extend to the suction window but is spaced apart from the suction window by a certain distance. In this embodiment, the angle at which the extension section 304 extends in the direction of the profile is 20 ° or more and less than 120 °, preferably the angle at which the extension section 304 extends in the direction of the profile is less than the angle at which the extension section 104 extends in the direction of the profile in the first embodiment of the present invention, for example 24 ° or more and less than 60 °, so as to minimize additional power consumption caused by the extension section while minimizing the time at which fatigue failure of the scroll blade is likely to occur.

Although the material removal portion of the extension section 304 is shown in fig. 7 as three circular apertures 306 distributed along the line direction, it will be appreciated by those skilled in the art that the number, location and shape of the apertures may be designed as desired.

For example, fig. 9 shows a non-orbiting scroll 400 according to a fourth embodiment of the present invention, and similar to the third embodiment of the present invention, the non-orbiting scroll 400 includes an end plate 42, a spiral wrap vane 40 formed at one side of the end plate 42, and an outer circumferential wall 44 provided around the wrap vane 40. Scroll blade 40 extends from the substantially central position of end plate 42 from the inside toward the outside in the direction of the spiral-shaped line, and in the extending direction of the line thereof, scroll blade 40 includes compression section 402 and extension section 404 connected to each other. Unlike the third embodiment according to the invention, three apertures 406 in the extension section 404 configured as material removal are arranged in the axial direction. In this case, most of the area of the extension section 404 has the same radial inner side surface as the compression section 402 except for the smaller area where the orifice 40 is arranged, thus further increasing the contact area between the wrap blades of the orbiting scroll and the wrap blades of the non-orbiting scroll in the extension section, thereby providing more sufficient radial support of the wrap blades of the orbiting scroll.

For another example, fig. 10 shows a fixed scroll 500 according to a fifth embodiment of the present invention, and similar to the third embodiment of the present invention, the fixed scroll 500 includes an end plate 52, a spiral wrap vane 50 formed at one side of the end plate 52, and an outer peripheral wall 54 provided around the wrap vane 50. The scroll blade 50 extends from the substantially central position of the end plate 52 from the inner side toward the outer side in the direction of the spiral-shaped line, and in the extending direction of the line thereof, the scroll blade 50 includes a compression section 502 and an extension section 504 connected to each other. Unlike the third embodiment according to the present invention, the aperture in the extension section 504 configured as a material removal is formed as an elongated slot 506. The elongated groove 506 extends through the entire extension section 504 in the thickness direction of the extension section 504. The elongated groove 506 may be provided at a middle region of the extension section 504 in the axial direction and extend outward in the molded line direction from a junction of the compression section 502 and the extension section 504 (i.e., at the molded line direction step 53). Accordingly, the through-holes in the peripheral wall 54 that align with the elongated slots 506 may also be configured as slots. In this case, the passage cross section of the communication passage for communicating the chamber formed between the extension section 504 of the fixed scroll and the scroll blade 90 of the movable scroll with the external low pressure environment of the compression mechanism, which is constituted by the elongated groove 506 and the through hole on the outer peripheral wall 54 aligned therewith, is larger, so that it is particularly advantageous to avoid additional compression of the working fluid by the chamber.

In addition, although the length of the elongated slot 506 extending along the profile direction is shown in fig. 10 as not reaching the total extension length of the extension section 504, i.e., the outer end of the elongated slot 506 does not reach the outer end of the extension section 504 in the profile direction, it will be appreciated by those skilled in the art that the elongated slot may extend as far as the outer end of the extension section or even beyond the outer end of the extension section.

The non-orbiting scroll 600 according to the sixth embodiment of the present invention shown in fig. 11a includes an end plate 62, a spiral wrap blade 60 formed at one side of the end plate 62, and an outer circumferential wall 64 disposed around the wrap blade 60, similar to the fifth embodiment of the present invention. The scroll blade 60 extends from the substantially central position of the end plate 62 from the inner side toward the outer side in the direction of the spiral-shaped line, and in the extending direction of the line thereof, the scroll blade 60 includes a compression section 602 and an extension section 604 connected to each other. Unlike the fifth embodiment according to the present invention, the extension section 604 includes an elongated groove 606 configured as a material removing portion, the elongated groove 606 extending through the entire extension section 604 in the thickness direction of the extension section 604. The elongated slot 606 may be disposed axially in a middle region of the extension section 604 and extend in the profile direction from the junction of the compression section 602 and the extension section 604 (i.e., at the profile direction step 63) to the outer end of the extension section 604. That is, the outer end of extension section 604 is configured in a non-closed open form to form the outer end of elongated slot 602. Accordingly, peripheral wall 64 may be formed with a slotted through bore aligned with and substantially the same shape as elongate slot 602, similar to the fifth embodiment of the present invention, thereby directly communicating the chamber formed between extension section 604 of the non-orbiting scroll and orbiting scroll wrap 90 with the external low pressure environment of the compression mechanism to avoid additional compression of the working fluid by the chamber.

Alternatively, as shown in fig. 11a and 11b, unlike the fifth embodiment according to the present invention, the outer peripheral wall 64 may also be formed with a communication groove 646, the communication groove 646 extending outward in the line direction from the outer end of the elongated groove 602. The elongated groove 602 communicates at its outer end with the communication groove 646. The communication groove 646 may be formed as a through hole penetrating the outer circumferential wall 64 in the thickness direction of the outer circumferential wall 64, so that the elongated groove 602 communicates with the external environment of the compression mechanism through the communication groove 646, as shown in fig. 11 b. Alternatively, the communication groove 646 may also be formed in a half-groove form recessed from the radially inner side surface of the outer peripheral wall 64 without penetrating the outer peripheral wall 64 in the thickness direction, so that the long groove 602 communicates with the suction window through the communication groove 646 and with the external environment of the compression mechanism via the suction window.

In the fifth embodiment of the present invention, the non-orbiting scroll 600 has the design of the extension section, so that on one hand, the contact between the scroll blade of the non-orbiting scroll and the scroll blade of the orbiting scroll is increased through the extension section, thereby providing more radial support for the scroll blade of the orbiting scroll, effectively reducing the failure risk of the scroll component, and on the other hand, the extension section is kept in communication with the external low pressure environment of the compression mechanism all the time through the long groove 606, thereby not only avoiding the influence of the extension section on the original displacement and pressure ratio of the compression mechanism, but also avoiding additional power consumption, and having simple processing and easy manufacturing.

The drawings illustrate only six exemplary embodiments under the concept of the invention. Those skilled in the art will appreciate that the invention is not limited to the exemplary embodiments described above, but also includes variations or combinations of the various examples described above. For example, the material removing portion may be formed in a hole-groove combination, and the shape thereof may be designed as needed. In addition, although in the exemplary embodiment of the present invention, the scroll member is implemented as a fixed scroll, it will be understood by those skilled in the art that the scroll member may also be implemented as an orbiting scroll, particularly for the case where the material removing portion is configured as an upper side section or a lower side section of the extension section in the axial direction from which material is removed and the case where the material removing portion is configured as an elongated groove extending up to an outer end of the extension section.

Although various embodiments of the present invention have been described in detail herein, it is to be understood that the invention is not limited to those precise embodiments described and shown herein, and that other modifications and variations may be effected by one skilled in the art without departing from the spirit or scope of the invention. All such modifications and variations are intended to be within the scope of the present invention. Moreover, all the components described herein may be replaced by other technically equivalent elements.

Claims (13)

1. A scroll member of a compression mechanism comprising:

end plates (12, 22, 32, 42, 52, 62);

scroll blades (10, 20, 30, 40, 50, 60) formed on one side of the end plate, extending from the inner side to the outer side in a spiral-shaped line direction from a substantially central position of the end plate,

characterized in that the scroll blade comprises a compression section (102, 202, 302, 402, 502, 602) and an extension section (104, 204, 304, 404, 504) connected to each other, the compression section being located inside the extension section in the direction of the profile, the compression section being adapted to configure a chamber for a compression operation,

the radial thickness of the extension section is smaller than the radial thickness of the compression section, the extension section is formed with a material removal portion, and the chamber configured by the extension section can communicate with a low pressure environment outside the compression mechanism through the material removal portion.

2. The scroll member of a compression mechanism of claim 1, wherein said scroll member is a non-orbiting scroll (100, 200, 300, 400, 500, 600) further comprising a peripheral wall (14, 24, 34, 44, 54, 64) disposed about said scroll blade, said extension section being disposed in close proximity to a radially inner surface of said peripheral wall.

3. The scroll component of a compression mechanism of claim 2, wherein the extension section is disposed in a region of greatest rigidity of the peripheral wall.

4. A scroll member of a compression mechanism according to claim 2, wherein said peripheral wall has a suction window formed therein for allowing working fluid to enter said compression mechanism, said extension section extending in said line direction to said suction window such that an innermost contact point of said scroll blade in said line direction is already in a contact state in a case where said contact point of said scroll blade in said line direction has not been out of contact when said compression mechanism is operated.

5. The scroll member of a compression mechanism according to any one of claims 1 to 4, wherein said material removing portion (107, 207) is configured in a form in which an upper or lower portion of said extension section (104, 204) in an axial direction is removed of material, such that said scroll blade has a stepped shape in said axial direction.

6. The scroll component of a compression mechanism according to any one of claims 1 to 4, wherein the extension section (104, 204) extends in the direction of the profile at an angle of 20 ° or more and less than 120 °.

7. A scroll member of a compression mechanism as claimed in claim 2 or 3, wherein the material removal portion is configured as one or more apertures (306, 406, 506) extending through the extension section (304, 504, 604) in the thickness direction thereof, the apertures being aligned with and communicating with through holes formed in the peripheral wall (34, 44, 54) in direct communication with a low pressure environment external to the compression mechanism.

8. The scroll member of a compression mechanism according to claim 7, wherein said ports are disposed in said profile direction or in an axial direction,

the orifice is a plurality of round holes or a single elongated slot.

9. The scroll component of a compression mechanism according to any one of claims 2 to 4, wherein the material removal portion is configured as an elongated slot (606) penetrating the extension section (604) in a thickness direction thereof, the elongated slot (606) extending in the profile direction up to an outer end of the extension section (604).

10. The scroll member of a compression mechanism according to claim 9, wherein said elongated groove (606) communicates with a communication groove (646) formed on said peripheral wall (64), said communication groove (646) extending outwardly from an outer end of said elongated groove (606), said peripheral wall being formed with a suction window for allowing a working fluid to enter said compression mechanism, said communication groove (646) being configured as a through hole in direct communication with a low pressure environment outside said compression mechanism or as a half groove recessed from a radially inner surface of said peripheral wall in communication with said suction window.

11. A compression mechanism comprising a non-orbiting scroll and an orbiting scroll engaged with each other to form a series of compression chambers between the non-orbiting and orbiting scrolls, wherein the non-orbiting or orbiting scroll is configured as a scroll member as claimed in any one of claims 1 to 10.

12. The compression mechanism of claim 11, wherein an extension section of a wrap vane of one of the non-orbiting scroll and the orbiting scroll is configured to make contact with the other of the non-orbiting scroll and the orbiting scroll, but the extension section is not used to form the compression chamber.

13. A scroll compressor comprising a compression mechanism according to claim 11 or 12.