Scroll member, compression mechanism, and scroll compressor

Abstract

The present application provides a scroll component of a compression mechanism, comprising an end plate and scroll vanes formed on one side of the end plate, the scroll vanes extending from a substantially central position of the end plate to an outer side in a spiral profile direction, wherein the scroll vanes comprise a compression section and an extension section connected to each other, the compression section is located inward of the extension section in the profile direction, the compression section is adapted to form a chamber for compression operation, the radial thickness of the extension section is smaller than that of the compression section, the extension section is formed with a material removal portion, and a chamber formed by the extension section is capable of being communicated with a low-pressure environment outside the compression mechanism through the material removal portion. The present application also provides a compression mechanism. The present application also provides a scroll compressor. The scroll component, the compression mechanism comprising the scroll component and the scroll compressor according to the present application have improved fatigue strength while the original displacement and pressure ratio remain unchanged.

Description

Technical Field

[0001] This invention relates to a scroll component, and more particularly, to a scroll component with high fatigue strength. Furthermore, this invention also relates to a compression mechanism including the scroll component and a scroll compressor including the compression mechanism. Background Technology

[0002] A scroll compressor generally includes a housing, a drive mechanism housed within the housing, a compression mechanism driven by the drive mechanism, and a main bearing housing supporting the compression mechanism. The compression mechanism typically includes a moving scroll and a stationary scroll that mesh with each other, forming a series of compression chambers between them. When the drive shaft of the drive mechanism rotates, it drives the moving scroll via a crank pin on the drive shaft, causing the moving scroll to translate relative to the stationary scroll. In other words, the axis of the moving scroll revolves around a circular track relative to the axis of the stationary scroll, but neither the moving nor the stationary scroll rotates around its own axis.

[0003] During the translational motion of the moving scroll around the stationary scroll, the moving scroll blades and the stationary scroll blades make contact and seal in the radial direction, bearing lateral contact forces. During one complete translational revolution of the moving scroll, the number of contact pairs between the moving and stationary scroll blades varies between 4 and 6 pairs. Therefore, with a relatively constant total lateral contact force, when there are 4 contact pairs, the lateral contact force distributed at each contact pair is the greatest. At this point, the scroll blades are prone to failure at the contact pairs, or even complete breakage. This is especially true for high-frequency inverter compressors, where scroll blade breakage is particularly likely to occur when the speed exceeds, for example, 6000 RPM.

[0004] Therefore, a design is needed to improve the fatigue strength of scroll blades in order to solve the problem of scroll blade failure at high speeds in scroll compressors, especially high-frequency variable-frequency scroll compressors. Summary of the Invention

[0005] This section provides a general overview of the invention, rather than a full disclosure of the invention's complete scope or all its features.

[0006] One objective of this invention is to provide a scroll component, a compression mechanism including the scroll component, and a scroll compressor including the compression mechanism. The scroll blades of the scroll component include extended sections that can contact each other with the meshing scroll blades. This not only increases the number of contact pairs between the two meshing scroll blades, thereby effectively reducing the radial load borne at each contact pair, thus improving the fatigue strength of the scroll component and reducing the failure risk of the scroll component, but also has virtually no impact on the displacement and pressure ratio of the compression mechanism.

[0007] Another object of the present invention is to provide a scroll component, a compression mechanism including the scroll component, and a scroll compressor including the compression mechanism, wherein the scroll blades of the scroll component not only have high fatigue strength, but also the power consumption of the scroll component does not increase significantly.

[0008] Another object of the present invention is to provide a scroll component, a compression mechanism including the scroll component, and a scroll compressor including the compression mechanism. The scroll component has a simple structure, is easy to manufacture and process, and is inexpensive.

[0009] According to one aspect of the present invention, a scroll component of a compression mechanism is provided, comprising: an end plate and scroll blades, the scroll blades being formed on one side of the end plate, the scroll blades extending from the approximate center of the end plate along a helical profile direction from the inside to the outside, wherein the scroll blades include a compression section and an extension section connected to each other, the compression section being located inside the extension section in the profile direction, the compression section being adapted to construct a chamber for compression operation, the radial thickness of the extension section being less than the radial thickness of the compression section, the extension section having a material removal section, the chamber constructed by the extension section being able to communicate with a low-pressure environment outside the compression mechanism through the material removal section.

[0010] Optionally, the vortex component is a fixed vortex, which also includes an outer peripheral wall surrounding the vortex blades, and the extension section is configured to be close to the radially inner surface of the outer peripheral wall.

[0011] Optionally, the extension section is located in the region of greatest stiffness of the outer peripheral wall.

[0012] Optionally, an intake window is formed on the outer peripheral wall to allow working fluid to enter the compression mechanism. The extension section extends to the intake window along the profile direction, such that when the innermost contact point of the scroll blade along the profile direction has not yet left the contact state during the operation of the compression mechanism, the outermost contact point of the scroll blade along the profile direction is already in the contact state.

[0013] Optionally, the material removal section is configured such that material is removed from the upper or lower portion of the extended section in the axial direction, so that the vortex blade has a stepped shape in the axial direction.

[0014] Optionally, the extension segment extends at an angle greater than or equal to 20° and less than 120° along the profile direction.

[0015] Optionally, the material removal section is constructed as one or more orifices that penetrate the extension section in the thickness direction and are aligned and connected with through holes formed on the outer peripheral wall that are directly connected to the low-pressure environment outside the compression mechanism.

[0016] Optionally, the orifices are arranged along the profile direction or along the axial direction, and the orifices are multiple round holes or a single elongated groove.

[0017] Optionally, the material removal section is constructed as an elongated groove, which penetrates the extension section in the thickness direction and extends along the profile direction to the outer end of the extension section.

[0018] Optionally, the elongated groove communicates with a connecting groove formed on the outer peripheral wall. The connecting groove extends outward from the outer end of the elongated groove. An air intake window is formed on the outer peripheral wall to allow the working fluid to enter the compression mechanism. The connecting groove is configured as a through hole that directly communicates with the low-pressure environment outside the compression mechanism or as a semi-groove that is recessed from the radially inner surface of the outer peripheral wall and communicates with the air intake window.

[0019] According to another aspect of the invention, a compression mechanism is provided, comprising a fixed vortex and a moving vortex meshing with each other to form a series of compression cavities between the fixed vortex and the moving vortex, wherein the fixed vortex or the moving vortex is configured as the vortex component described above.

[0020] Optionally, the extension of the scroll blade of one of the fixed scroll and the moving scroll can make contact with the other of the fixed scroll and the moving scroll, but the extension is not used to form a compression cavity.

[0021] According to another aspect of the present invention, a scroll compressor is provided, wherein the scroll compressor includes the compression mechanism described above.

[0022] In general, the scroll component, the compression mechanism including the scroll component, and the scroll compressor including the compression mechanism according to the present invention bring at least one of the following beneficial effects: Since the scroll blades of the scroll component have extended sections, these extended sections increase the contact points between the scroll blades and the meshing scroll blades, thereby improving the fatigue strength of the scroll component, making it particularly suitable for high-speed variable frequency compressors with speeds exceeding, for example, 6000 RPM; the extended sections of the scroll blades have material removal sections, thereby preventing the extended sections from participating in compression and minimizing the impact on the displacement and pressure ratio of the compression mechanism; the extended sections of the scroll blades are directly connected to the external low-pressure environment of the compression mechanism through material removal sections (e.g., holes or slots), thereby avoiding increased compression power consumption and further ensuring the efficiency of the compressor; the scroll component with extended sections has a simple structure, is easy to manufacture, has low production costs, and a wide range of applications. Attached Figure Description

[0023] The features and advantages of one or more embodiments of the present invention will become more readily apparent from the following description with reference to the accompanying drawings. The drawings provided herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. The drawings are not drawn to scale and some features may be enlarged or reduced to show details of specific parts. In the drawings:

[0024] Figure 1a This is a top perspective view of a fixed vortex according to a first embodiment of the present invention;

[0025] Figure 1b This is a top perspective view of a fixed vortex according to a first embodiment of the present invention;

[0026] Figure 2 This is a longitudinal cross-sectional view of a fixed vortex according to the first embodiment of the present invention;

[0027] Figure 3a and Figure 3b Radial cross-sectional views of the compression mechanism according to the first embodiment of the present invention are shown at time T1 after the start of exhaust and at time T2 after the start of exhaust and 180° rotation.

[0028] Figure 4a and Figure 4b Radial cross-sectional views of the compression mechanism in the comparative example are shown at time T1 after the start of exhaust and at time T2 after the start of exhaust and 180° rotation.

[0029] Figure 5 This is a top perspective view of a fixed vortex according to a second embodiment of the present invention;

[0030] Figure 6 This is a radial cross-sectional view of the compression mechanism according to a second embodiment of the present invention;

[0031] Figure 7 This is a top perspective view of a fixed vortex according to a third embodiment of the present invention;

[0032] Figure 8a and Figure 8b Radial cross-sectional views of the compression mechanism according to the third embodiment of the present invention are shown at time T1 after the start of exhaust and at time T2 after the start of exhaust and 180° rotation.

[0033] Figure 9 This is a top perspective view of a fixed vortex according to the fourth embodiment of the present invention;

[0034] Figure 10 This is a top perspective view of a fixed vortex according to the fifth embodiment of the present invention;

[0035] Figure 11a This is a top perspective view of a fixed vortex according to a sixth embodiment of the present invention; and

[0036] Figure 11b This is a radial cross-sectional view of a fixed vortex according to the sixth embodiment of the present invention. Detailed Implementation

[0037] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. This description is merely exemplary and does not constitute a limitation on the present invention and its applications.

[0038] Typically, a scroll compressor (sometimes referred to as a compressor below) includes a housing, a compression mechanism consisting of a stationary scroll and a moving scroll, a main bearing housing, and a drive shaft and motor for driving the compression mechanism. An eccentric crank pin is located at one end of the drive shaft adjacent to the moving scroll. The eccentric crank pin is inserted into the hub of the moving scroll. An unloading bushing can be provided between the eccentric crank pin and the hub to provide radial flexibility to the compression mechanism. Additionally, a drive bearing is located between the unloading bushing and the hub of the moving scroll. Driven by the motor, the drive shaft, via the eccentric crank pin, the unloading bushing, and the drive bearing, causes the moving scroll to perform a translational rotation relative to the stationary scroll (i.e., the central axis of the moving scroll moves around the central axis of the stationary scroll, but the moving scroll itself does not rotate around its own central axis) to compress the working fluid. This rotational motion is achieved through a cross-shaped slip ring.

[0039] The moving vortex includes an end plate, a hub formed on one side of the end plate, and helical vortex blades 90 formed on the other side of the end plate (see, for example, [reference needed]). Figure 3a See also Figure 1a and Figure 1b According to a first embodiment of the present invention, a fixed scroll 100 includes an end plate 12, helical scroll blades 10 formed on one side of the end plate 12, and an exhaust port 18 formed at approximately the center of the end plate 12. A series of chambers (hereinafter referred to as compression chambers) for compression operation are formed between the scroll blades 10 of the fixed scroll 100 and the scroll blades 90 of the moving scroll, with volumes gradually decreasing from the radially outer side to the radially inner side. The fixed scroll 100 also includes an outer peripheral wall 14 surrounding the scroll blades 10, and an intake window 16 is provided at the outer peripheral wall 14 and / or the end plate 12. Figure 1a In the process, the intake window 16 includes a portion formed on the outer peripheral wall 14 and a portion formed on the end plate 12, so that the working fluid enters the compression chamber through the intake window 16 and is discharged through the exhaust port 18 after being compressed in the compression chamber.

[0040] Specifically, see Figure 1a and Figure 1bThe scroll blade 10 extends from the approximate center of the end plate 12 along a helical profile from the inside to the outside. That is, the innermost end 11 of the scroll blade 10 is located at the approximate center of the end plate 12 (near the exhaust port 18), and the outermost end of the scroll blade 10, opposite to the innermost end 11, is located near the radial outer periphery of the end plate 12. In its profile direction, the scroll blade 10 includes a compression section 102 and an extension section 104 connected to each other, with the compression section 102 located inside the extension section 104. In this document, the compression section 102 refers to the section of the scroll blade adapted to construct a chamber for compression operation; that is, the compression section 102 engages with the rotating scroll blade 90 to form a compression chamber. The extension section 102 continues outward along the profile direction from the outermost end of the compression section 102. Therefore, the extension section 104 and a portion of the compression section 102 together constitute the outermost ring of the scroll blade 10. The outermost blade of the vortex blade 10 is surrounded by the outer peripheral wall 14.

[0041] like Figure 2 As shown, the extension section 104 is not configured to extend along the entire axial height of the compression section 102, but instead includes a material removal section 107. Specifically, the lower portion of the extension section 104 in the axial direction has material removed to form the material removal section 107, and the upper portion 105 of the extension section 104 in the axial direction extends from the compression section 102 to the intake window 16. That is, the extension section 104 has an axial step portion 103 in the axial direction. When the scroll blades 90 of the moving scroll engage with the extension section 104 (i.e., the upper portion 105 of the extension section 104) to form a chamber, this chamber remains in communication with the intake window 16 through the material removal section 107, thus preventing compression of the working fluid. Consequently, 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 are only related to the compression section), and no additional compression power consumption is generated. Preferably, the radial inner surface of the extension section 104 (i.e., the upper part 105 of the extension section 104) is flush with the radial inner surface of the compression section 102 and maintains the same machining accuracy, thereby ensuring the smooth rotation of the moving vortex relative to the fixed vortex and ensuring the radial support of the fixed vortex to the moving vortex.

[0042] like Figure 1a and Figure 1bAs shown, the thickness of the extension section 104 in the radial direction (i.e., the thickness of the upper portion 105 of the extension section 104) is less than the thickness of the compression section 102 in the radial direction, thereby forming a profiled step portion 13 at the junction of the radially outer surfaces of the extension section 104 and the compression section 102. Therefore, the extension section 104 can be configured to closely abut the radially inner surface of the outer peripheral wall 14 to provide radial support for the moving vortex 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 blade 90 of the moving vortex.

[0043] The following reference Figure 3a , Figure 3b and combined Figure 4a , Figure 4b The compression mechanism shown in the comparative example illustrates the operation and advantages of the compression mechanism according to the first embodiment of the present invention.

[0044] Figure 3a and Figure 3b Radial sectional views of the compression mechanism according to the first embodiment of the present invention are shown at time T1 after the start of exhaust and at time T2 after the start of exhaust and 180° rotation. During the translational rotation of the moving vortex around the stationary vortex, the scroll blades 90 of the moving vortex and the scroll blades 10 of the stationary vortex 100 come into contact. The number and position of the contact points between them change continuously with the movement of the moving vortex, and the number of contact points is usually in the range of 4 to 6. Obviously, under the unchanged operating conditions of the compression mechanism, the total lateral support force between the scroll blades 90 of the moving vortex and the scroll blades 10 of the stationary vortex 100 remains basically unchanged. Therefore, the smaller the number of contact points, the greater the radial load shared at each contact point. When the number of contact points is 4, the radial load shared at each contact point is the largest, and the vortex component is most likely to fail at this moment. Figure 3a At moment T1, immediately after the compression mechanism begins to exhaust gas, the innermost contact point of the scroll blade 90 of the moving scroll and the scroll blade 10 of the fixed scroll 100 has just separated. The scroll blades 90 of the moving scroll and 100 of the fixed scroll 100 have four contact points, as shown by the circles in the diagram. The total lateral contact force between the moving scroll and the fixed scroll 100 is provided by these four contact points. For example... Figure 3bAt time T2, after the compression mechanism begins to exhaust, the moving scroll rotates 180°. The scroll blades 90 and 10 of the fixed scroll 100 have five contact points, as shown by the circles in the figure. The four innermost contact points between the moving scroll blades 90 and 10 of the fixed scroll 100 occur between the compression sections 102 of the moving scroll blades 90 and 10 of the fixed scroll 100. The outermost contact point between the moving scroll blades 90 and 10 of the fixed scroll 100 (e.g., ...) Figure 3b (As shown by circle X in the diagram) is located in the extension section 104 of the scroll blade 10 of the fixed scroll 100. That is, at this moment, the scroll blade 90 of the moving scroll is in contact with the upper portion 105 of the extension section 104 of the scroll blade 10 of the fixed scroll 100, and the upper portion 105 and the outer peripheral wall 14 against which it rests (which may also include the outer structure of the outer peripheral wall) provide sufficient radial support for the scroll blade 90 of the moving scroll.

[0045] In comparison, in such Figure 4a and Figure 4b In the compression mechanism of the comparative example shown, the scroll component, particularly the scroll blades 10' of the fixed scroll 100', does not have an extension section (i.e., it only includes the compression section). Figure 4a At moment T1, immediately after the compression mechanism begins to exhaust gas, the innermost contact point of the moving scroll blade 90' ​​and the stationary scroll blade 10' has just separated. The moving scroll blade 90' ​​and the stationary scroll blade 10' have four contact points, as shown by the circles in the diagram. The total lateral contact force between the moving scroll and the stationary scroll 100 is provided by these four contact points. At this time... Figure 3a The radial load distribution of the compression mechanism of the present invention is not significantly different. However, as shown in the figure... Figure 4b At time T2, after the compression mechanism begins to exhaust, the moving scroll rotates 180°. At this point, the scroll blades 90 of the moving scroll and the scroll blades 10' of the stationary scroll 100' have only four contact points, as shown by the solid circles in the figure. Since the scroll blades 10' of the stationary scroll 100' do not include the extension section, the outermost blades of the moving scroll blade 90 do not contact the scroll blades 10' of the stationary scroll 100. That is, at... Figure 3b The compression mechanism according to the present invention is shown at the location where contact can occur (e.g. Figure 4b (As shown by the dashed circle X') No contact occurs. Therefore, for this moment T2, according to the first embodiment of the present invention, the contact point between the scroll blade 90 of the moving scroll and the scroll blade 10 of the fixed scroll 100 is increased by one 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 component.

[0046] According to the first embodiment of the present invention, the fixed scroll compressor, due to the design of its extension section, can effectively reduce the number of radial contact points between the scroll blades of the moving scroll and the scroll blades of the fixed scroll to four. By utilizing the outer peripheral wall of the fixed scroll to provide radial support for the moving scroll blades, the fatigue strength of the scroll component is improved, and the failure risk of the scroll component is minimized. Experiments have shown that the fatigue strength of the fixed scroll compressor according to the first embodiment of the present invention is improved by 18%. Furthermore, since the extension section includes a material removal section communicating with the intake window, the extension section does not affect the original displacement and pressure ratio of the compression mechanism, nor does it cause additional power consumption.

[0047] Preferably, in the first embodiment of the invention, the extension segment 104 is disposed in the region of greatest stiffness of the outer peripheral wall of the fixed vortex, for example, the region of greatest stiffness of the outer peripheral wall of the fixed vortex refers to the region of greatest radial thickness of the outer peripheral wall. In this region, the radial thickness of the outer peripheral wall is significantly greater than the radial thickness of the compression segment 102 of the vortex blade, thereby enabling the contact point between the extension segment 104 and the moving vortex blade to bear more lateral support force than other contact points between the compression segment 102 and the moving vortex blade, thereby improving the fatigue strength of the vortex component.

[0048] Despite Figure 1a and Figure 1b The diagram shows an extension segment 104 extending from the outermost end of the compression segment 102 along the profile direction to the intake window 16. However, the extension segment 104 may also extend a predetermined distance along the profile direction and be spaced apart from the intake window 16. Preferably, in the first embodiment of the invention, the angle at which the extension segment 104 extends along the profile direction is greater than or equal to 20° and less than 120°, preferably greater than or equal to 24°, and more preferably greater than or equal to 60°, thereby minimizing the time when fatigue failure of the scroll blades is likely to occur (i.e., the time when there are 4 contact pairs between the scroll blades of the moving scroll and the scroll blades of the stationary scroll).

[0049] The material removal section of the extension segment of the vortex blade can be located on the lower side of the extension segment along the axial direction or on the upper side of the extension segment along the axial direction. Figure 5 and Figure 6A fixed scroll 200 according to a second embodiment of the present invention and a compression mechanism including a moving scroll and a fixed scroll 200 are shown respectively. Similar to the first embodiment of the present invention, the fixed scroll 200 includes an end plate 22, a helical scroll blade 20 formed on one side of the end plate 22, and an outer peripheral wall 24 surrounding the scroll blade 20. The scroll blade 20 extends from the approximate center position of the end plate 22 along a helical profile direction from the inside to the outside. In the direction of its profile extension, the scroll blade 20 includes a compression section 202 and an extension section 204 connected to each other. Unlike the first embodiment of the present invention, the upper portion of the extension section 204 in the axial direction has material removed to form a material removal section 207, and the lower portion 205 of the extension section 204 in the axial direction extends from the compression section 202 to an air intake window at the outer peripheral wall 24. That is, the extension section 204 has an axial step portion 203 in the axial direction.

[0050] In the second embodiment of the present invention, the fixed scroll 200, due to the design of its extension section, increases the contact between the scroll blades of the fixed scroll and the scroll blades of the moving scroll through the lower portion 205, thereby providing more radial support for the scroll blades of the moving scroll and effectively reducing the failure risk of the scroll components. Furthermore, the extension section communicates with the intake window through the material removal section 207, avoiding any impact on the original displacement and pressure ratio of the compression mechanism, and also preventing additional power consumption. In other words, the second embodiment of the present invention has similar advantages and effects to the first embodiment.

[0051] Additionally, preferably, see Figure 6 When the extension section 204 of the fixed scroll 200 extends a considerable distance along the profile direction from the outermost end of the compression section 202, especially extending to the intake window, the innermost contact points A1 and A2 of the scroll blades of the fixed scroll 200 and the scroll blades 90 of the moving scroll along the profile direction are still in a state of separation, while the outermost contact point B of the two along the profile direction is already in contact. Therefore, during the rotational motion of the moving scroll, more contact points can be generated between the scroll blades 20 of the fixed scroll 200 and the scroll blades 90 of the moving scroll, thereby further reducing the radial load at a single contact point and improving the fatigue strength of the scroll component.

[0052] Figure 7A fixed vortex 300 according to a third embodiment of the present invention is shown, wherein, similar to the first embodiment of the present invention, the fixed vortex 300 includes an end plate 32, a helical vortex blade 30 formed on one side of the end plate 32, and an outer peripheral wall 34 disposed around the vortex blade 30, wherein an air intake window is provided at the outer peripheral wall 34 and / or the end plate 32. The vortex blade 30 extends from the interior to the exterior along a helical profile direction from approximately the center of the end plate 32, and in the extension direction of its profile, the vortex 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 less than the thickness of the compression section 302, thereby forming a profile-directed step portion 33 at the junction of the radially outer surfaces of the extension section 304 and the compression section 302. Thus, the extension section 304 can be configured to be close to the radially inner surface of the outer peripheral wall 34 to provide radial support when the extension section 304 comes into contact with the blade 90 of the moving vortex.

[0053] Unlike the first embodiment according to the invention, the extension segment 304 is configured to extend along the entire height direction of the compression segment 302, i.e., the extension segment 304 is flush with the compression segment 302 and has the same axial dimension. The radially inner surface of the extension segment 304 has the same machining precision as the radially inner surface of the compression segment 302, and together they form a smooth surface extending along the profile direction. The extension segment 304 includes one or more orifices 306 extending through the entire extension segment 304 in its thickness direction, for example in... Figure 7 The diagram shows three orifices 306 arranged along the extension direction of the profile. These orifices 304 constitute the material removal section of the extension segment 304. The orifices 306 are aligned with and communicate with through holes formed on the outer peripheral wall 34. When the rotating vortex blades 90 engage with the extension segment 304 to form a chamber (see, for example, [reference needed]). Figure 8a The chamber is directly connected to the low-pressure environment outside the compression mechanism through the orifice 306 at the extension section 304 and the through hole formed at the outer peripheral wall 34. In other words, the orifice 306 at the extension section 304 and the through hole formed at the outer peripheral wall 34 together form a communication channel connecting the chamber constructed by the extension section 304 with the external environment of the compression mechanism. Therefore, the chamber constructed by the extension section 304 does not compress the working fluid, thus not affecting the displacement and pressure ratio of the compression mechanism (i.e., the displacement and pressure ratio of the compression mechanism are only related to the compression section), and does not generate additional compression power consumption.

[0054] The following reference Figure 8a , Figure 8b The operation and advantages of the compression mechanism according to the third embodiment of the present invention will be described.

[0055] Figure 8a and Figure 8bRadial sectional views of the compression mechanism according to the third embodiment of the present invention are shown at time T1 after the start of exhaust and at time T2 after the start of exhaust and 180° rotation. During the translational rotation of the moving vortex around the fixed vortex, the scroll blades 90 of the moving vortex and the scroll blades 30 of the fixed vortex come into contact. The number and position of the contact points between them change continuously with the movement of the moving vortex, and the number of contact points is usually in the range of 4 to 6. Figure 8a At moment T1, immediately after the compression mechanism begins to exhaust gas, the innermost contact point of the moving scroll blade 90 and the stationary scroll blade 30 has just separated. The moving scroll blade 90 and the stationary scroll blade 30 have four contact points, as shown by the circles in the diagram. The total lateral contact force between the moving scroll and the stationary scroll 300 is provided by these four contact points. For example... Figure 8b At time T2, after the compression mechanism begins to exhaust, the moving vortex rotates 180°. The moving vortex blade 90 and the stationary vortex blade 30 have five contact points, as shown by the circles in the diagram. The four innermost contact points between the moving vortex blade 90 and the stationary vortex blade 30 occur between the compression sections 302 of the moving and stationary vortex blades. The outermost contact point between the moving vortex blade 90 and the stationary vortex blade 30 (e.g., ...) is... Figure 8b (As shown by circle X in the diagram) is located in the extension section 304 of the scroll blade 30 of the fixed scroll 300. That is, at this moment, the scroll blade 90 of the moving scroll is in contact with the radially inner surface of the extension section 304 of the scroll blade 30 of the fixed scroll 300, and the extension section 304 and the outer peripheral wall 34 against which the extension section 304 abuts provide sufficient radial support for the scroll blade 90 of the moving scroll. At the same time, the cavity formed between the extension section 304 of the fixed scroll and the scroll blade 90 of the moving scroll is connected to the external low-pressure environment of the compression mechanism through the orifice 306 that runs through the extension section 304 along the thickness direction of the extension section 304 and the through hole on the outer peripheral wall 34, thereby preventing the cavity from performing additional compression on the working fluid.

[0056] According to the third embodiment of the present invention, the fixed scroll, due to the design of its extension section, can effectively reduce the number of contact points between the moving scroll and the fixed scroll to four. The outer peripheral wall and outer structure of the fixed scroll provide radial support to the moving scroll blades, thereby improving the fatigue strength of the scroll component and minimizing the risk of scroll component failure. On the other hand, since the extension section includes a material removal section that directly communicates with the external environment of the compression mechanism, the extension section does not affect the original displacement and pressure ratio of the compression mechanism. Furthermore, since the extension section extends along the entire height direction of the compression section, it increases the contact area between the scroll blades of the moving scroll and the scroll blades of the fixed scroll in the extension section, thereby providing more adequate radial support to the scroll blades of the moving scroll. In the third embodiment of the present invention, the contact points located in the extension section can share 40% of the total lateral support force. Experiments have shown that the fatigue strength of the fixed scroll according to the third embodiment of the present invention is improved by 20%.

[0057] Preferably, in the third embodiment of the present invention, the extension segment 304 of the fixed vortex 300 does not extend to the intake window but is spaced a certain distance from it. In this embodiment, the extension segment 304 extends at an angle greater than or equal to 20° and less than 120° along the profile direction. Preferably, the extension segment 304 extends at an angle less than the extension segment 104 in the first embodiment of the present invention, for example, greater than or equal to 24° and less than 60°, thereby minimizing the time when fatigue failure of the vortex blade is likely to occur while minimizing the additional power consumption caused by the extension segment.

[0058] Despite Figure 7 The material removal section of the extension segment 304 shown is constructed as three circular orifices 306 distributed along the profile direction. However, those skilled in the art will understand that the number, distribution position, and shape of the orifices can be designed as needed.

[0059] For example, Figure 9A fixed vortex 400 according to a fourth embodiment of the present invention is shown. Similar to the third embodiment, the fixed vortex 400 includes an end plate 42, a helical vortex blade 40 formed on one side of the end plate 42, and an outer peripheral wall 44 surrounding the vortex blade 40. The vortex blade 40 extends from the interior to the exterior along a helical profile direction from approximately the center of the end plate 42. In the direction of its profile extension, the vortex blade 40 includes a compression section 402 and an extension section 404 connected to each other. Unlike the third embodiment, three orifices 406 configured as material removal sections in the extension section 404 are arranged axially. In this case, except for the smaller area where the orifices 40 are arranged, most of the area of ​​the extension section 404 has the same radially inner surface as the compression section 402, thus further increasing the contact area between the moving vortex blade and the fixed vortex blade in the extension section, thereby providing more adequate radial support for the moving vortex blade.

[0060] For example, Figure 10 A fixed vortex 500 according to a fifth embodiment of the present invention is shown. Similar to the third embodiment of the present invention, the fixed vortex 500 includes an end plate 52, a helical vortex blade 50 formed on one side of the end plate 52, and an outer peripheral wall 54 surrounding the vortex blade 50. The vortex blade 50 extends from the interior to the exterior along a helical profile direction from approximately the center of the end plate 52. In the extension direction of its profile, the vortex blade 50 includes a compression section 502 and an extension section 504 connected to each other. Unlike the third embodiment of the present invention, the orifice in the extension section 504, which is configured as a material removal section, is formed as an elongated groove 506. The elongated groove 506 extends through the entire extension section 504 in the thickness direction. The elongated groove 506 may be configured to be located in the middle region of the extension section 504 in the axial direction and extend outward along the profile direction from the connection between the compression section 502 and the extension section 504 (i.e., at the profile direction step 53). Correspondingly, the through hole on the outer peripheral wall 54 aligned with the elongated groove 506 can also be constructed as a groove. In this case, the cross-sectional area of ​​the passage formed by the elongated groove 506 and the through hole on the outer peripheral wall 54 aligned with it, which connects the chamber between the extension section 504 of the stationary vortex and the vortex blade 90 of the moving vortex and the external low-pressure environment of the compression mechanism, is larger, which is particularly advantageous in preventing the chamber from performing additional compression on the working fluid.

[0061] In addition, although in Figure 10The elongated groove 506 shown in the figure extends along the profile direction but does not reach the total extension length of the extension section 504. That is, in the profile direction, the outer end of the elongated groove 506 does not reach the outer end of the extension section 504. However, those skilled in the art will understand that the elongated groove can also extend to the outer end of the extension section or even beyond the outer end of the extension section.

[0062] exist Figure 11a The fixed vortex 600 shown in the sixth embodiment of the present invention is similar to that of the fifth embodiment of the present invention. The fixed vortex 600 includes an end plate 62, a helical vortex blade 60 formed on one side of the end plate 62, and an outer peripheral wall 64 surrounding the vortex blade 60. The vortex blade 60 extends from the approximate center of the end plate 62 along a helical profile direction from the inside to the outside. In the extension direction of its profile, the vortex blade 60 includes a compression section 602 and an extension section 604 connected to each other. Unlike the fifth embodiment of the present invention, the extension section 604 includes an elongated groove 606 configured as a material removal section, which extends through the entire extension section 604 in the thickness direction. The elongated groove 606 may be positioned in the middle region of the extension section 604 in the axial direction and extend along the profile direction from the connection point between 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. In other words, the outer end of the extension segment 604 is constructed as an open, non-closed structure to form the outer end of the elongated groove 602. Correspondingly, the outer peripheral wall 64 can be formed with a slot-shaped through hole that is aligned with and substantially the same in shape as the elongated groove 602, similar to the fifth embodiment of the invention, thereby directly connecting the chamber formed between the extension segment 604 of the fixed vortex and the scroll blade 90 of the moving vortex to the external low-pressure environment of the compression mechanism, so as to avoid additional compression of the working fluid by the chamber.

[0063] Alternatively, such as Figure 11a and Figure 11b As shown, unlike the fifth embodiment of the present invention, the outer peripheral wall 64 may also have a communicating groove 646, which extends outward along the profile direction from the outer end of the elongated groove 602. The elongated groove 602 communicates with the communicating groove 646 at its outer end. The communicating groove 646 may be formed as a through hole penetrating the outer peripheral wall 64 along the thickness direction of the outer peripheral wall 64, thereby allowing the elongated groove 602 to communicate with the external environment of the compression mechanism through the communicating groove 646, such as... Figure 11b As shown. Alternatively, the connecting groove 646 may also be formed as a semi-groove that is recessed from the radially inner surface of the outer peripheral wall 64 without penetrating the outer peripheral wall 64 in the thickness direction, so that the elongated groove 602 communicates with the intake window through the connecting groove 646 and with the external environment of the compression mechanism via the intake window.

[0064] In the fifth embodiment of the present invention, the fixed vortex 600, due to the design of its extension section, on the one hand, increases the contact between the scroll blades of the fixed vortex and the scroll blades of the moving vortex through the extension section, thereby providing more radial support for the scroll blades of the moving vortex and effectively reducing the failure risk of the scroll components. On the other hand, it maintains constant communication with the external low-pressure environment of the compression mechanism through the elongated groove 606, which not only avoids the influence of the extension section on the original displacement and pressure ratio of the compression mechanism, but also does not generate additional power consumption, and is simple to process and easy to manufacture.

[0065] The accompanying drawings illustrate only six exemplary embodiments within the framework of this invention. Those skilled in the art will understand 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 removal section can be constructed as a combination of holes and grooves, and its shape can be designed as needed. Furthermore, although the vortex component is implemented as a fixed vortex in the exemplary embodiments of the invention, those skilled in the art will understand that the vortex component can also be implemented as a moving vortex, particularly for cases where the material removal section is constructed such that material is removed from the upper or lower portion of the extended section in the axial direction, and for cases where the material removal section is constructed as an elongated groove extending to the outer end of the extended section.

[0066] Although various embodiments of the invention have been described in detail herein, it should be understood that the invention is not limited to the specific embodiments described and shown herein, and other modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention. All such modifications and variations fall within the scope of the invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A scroll member of a compression mechanism, comprising: an end plate (12, 22, 32, 42, 52, 62); a scroll blade (10, 20, 30, 40, 50, 60) formed on one side of the end plate, the scroll blade extending from a substantially central position of the end plate to an outer side thereof in a spiral curve direction, characterized in that the scroll blade includes 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 inward of the extension section in the curve direction, the compression section being adapted to configure a chamber for a compression operation, the extension section being capable of increasing a contact point between the scroll blade and another scroll blade engaged therewith during operation of the compression mechanism, a radial thickness of the extension section being smaller than a radial thickness of the compression section, the extension section being formed with a material removal portion, a chamber configured by the extension section being capable of communicating with a low-pressure environment outside the compression mechanism through the material removal portion.

2. The scroll member of a compression mechanism according to claim 1, wherein the scroll member being a fixed scroll (100, 200, 300, 400, 500, 600), the fixed scroll further including an outer peripheral wall (14, 24, 34, 44, 54, 64) disposed around the scroll blade, the extension section being disposed in close proximity to a radially inner side surface of the outer peripheral wall.

3. The scroll member of a compression mechanism according to claim 2, wherein the extension section is disposed in a region of the outer peripheral wall where a rigidity is the largest.

4. The scroll member of a compression mechanism according to claim 2, wherein an intake window for allowing a working fluid to enter the compression mechanism is formed in the outer peripheral wall, the extension section extending to the intake window in the curve direction such that, when the compression mechanism is operated, an innermost contact point of the scroll blade in the curve direction is not yet out of contact while an outermost contact point of the scroll blade in the curve direction is already in contact.

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

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

7. The scroll member of the compression mechanism according to claim 2 or 3, wherein the material removal portion is configured in one or more apertures (306, 406, 506) that penetrate the extension section (304, 504, 604) in a thickness direction thereof, the apertures being aligned with and communicating with through-holes formed in the outer peripheral wall (34, 44, 54) that directly communicate with a low-pressure environment outside the compression mechanism.

8. The scroll member of a compression mechanism according to claim 7, wherein the apertures are arranged in the curve direction or arranged in an axial direction, the apertures are a plurality of circular apertures or the apertures are a single elongated slot.

9. The scroll member of a compression mechanism according to any one of claims 2 to 3, wherein The material removal portion is configured as an elongated groove (606) that penetrates the extension section (604) in the thickness direction of the extension section, the elongated groove (606) extending in the contour direction to an outer side end of the extension section (604).

10. The scroll member of a compression mechanism according to claim 4, wherein The material removal portion is configured as an elongated groove (606) that penetrates the extension section (604) in the thickness direction of the extension section, the elongated groove (606) extending in the contour direction to an outer side end of the extension section (604).

11. The scroll member of a compression mechanism according to claim 9, wherein The elongated groove (606) communicates with a communication groove (646) formed on the outer peripheral wall (64), the communication groove (646) extending outward from the outer side end of the elongated groove (606), the outer peripheral wall having an intake window formed therein for allowing working fluid to enter the compression mechanism, the communication groove (646) being configured as a through-hole that directly communicates with a low-pressure environment outside the compression mechanism or as a half-groove that is recessed from a radially inner side surface of the outer peripheral wall and communicates with the intake window.

12. The scroll member of a compression mechanism according to claim 10, wherein, The elongated groove (606) communicates with a communication groove (646) formed on the outer peripheral wall (64), the communication groove (646) extending outward from the outer side end of the elongated groove (606), the communication groove (646) being configured as a through-hole that directly communicates with a low-pressure environment outside the compression mechanism or as a half-groove that is recessed from a radially inner side surface of the outer peripheral wall and communicates with the intake window.

13. A compression mechanism comprising a fixed scroll and an orbiting scroll meshing with one another to form a series of compression pockets between the fixed scroll and the orbiting scroll, characterized in that, The fixed scroll or the orbiting scroll is configured as the scroll member according to any one of claims 1 to 12.

14. The compression mechanism of claim 13, wherein, An extension section of the wrap blade of one of the fixed scroll and the orbiting scroll is capable of coming into contact with the other of the fixed scroll and the orbiting scroll, but the extension section is not used to form the compression chamber.

15. A scroll compressor characterized by, The scroll compressor includes the compression mechanism according to claim 13 or 14.

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