Pump body assembly and scroll compressor

Abstract

The utility model provides a kind of pump body assembly and scroll compressor, pump body assembly includes: crankshaft, including shaft part and eccentric part, shaft part is connected with motor part, shaft part includes first end, eccentric part is located the end face of first end and is eccentric relative to shaft part Setting;First support is equipped with cavity, at least a part of eccentric part is located in cavity;Among them, crankshaft is equipped with oil return channel, oil return channel includes oil inlet end and oil outlet end, oil inlet end penetrates the end face of first end and is communicated with cavity, and oil inlet end avoids eccentric part setting, oil outlet end is located shaft part and is communicated with oil pool, and oil outlet end is located the side of motor part away from first support.The utility model provides the pump body assembly, ensure the speed and oil return amount of lubricating oil backflow oil pool.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and more specifically, to a pump body assembly and a scroll compressor. Background Technology

[0002] Currently, in scroll compressors of related technologies, the oil return path is exposed inside the compressor casing. The high-speed flow of refrigerant and other fluids inside the casing will significantly disturb the oil flowing back along the casing wall. Furthermore, the rapid changes in pressure inside the casing will further interfere with the oil return process, and may even entrain some refrigeration oil, causing it to be discharged from the compressor with the fluid. This results in a slowdown in the oil return speed, an increase in the amount of oil discharged by the compressor, and ultimately affects the operational reliability of the compressor. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, the first aspect of this utility model provides a pump body assembly.

[0005] A second aspect of this invention also provides a scroll compressor.

[0006] In view of the above, the first aspect of this utility model provides a pump body assembly for use in a scroll compressor. The scroll compressor includes a motor section and an oil sump. The pump body assembly includes: a crankshaft, including a rotating shaft section and an eccentric section, the rotating shaft section being connected to the motor section, the rotating shaft section including a first end, the eccentric section being disposed on the end face of the first end and eccentrically disposed relative to the rotating shaft section; a first bracket, having a cavity, at least a portion of the eccentric section being disposed within the cavity; wherein the crankshaft has an oil return channel, the oil return channel including an oil inlet end and an oil outlet end, the oil inlet end penetrating through the end face of the first end and communicating with the cavity, and the oil inlet end being disposed to avoid the eccentric section, the oil outlet end being located on the rotating shaft section and communicating with the oil sump, and the oil outlet end being located on the side of the motor section away from the first bracket.

[0007] The pump assembly provided by this utility model includes a crankshaft and a first bracket. The crankshaft includes a rotating shaft portion and an eccentric portion. The rotating shaft portion is connected to a motor portion to transmit power. The eccentric portion is disposed on the end face of the first end of the rotating shaft portion and is eccentrically positioned relative to the central axis of the rotating shaft portion to drive the moving scroll of the pump assembly. The first bracket is a supporting structure for the pump assembly and has a cavity in which at least a portion of the eccentric portion is accommodated, thereby supporting the crankshaft. The crankshaft incorporates an internal oil return channel, comprising an inlet and an outlet. The inlet connects to the cavity, while the outlet connects to the oil sump. The inlet is positioned at the first end of the crankshaft, avoiding the eccentric portion, while the outlet is located on the side of the crankshaft opposite the first support. During pump assembly operation, lubricating oil, after being lubricated at the pump assembly, collects within the cavity of the first support. Under pressure or gravity, it enters the oil return channel from the inlet and returns to the oil sump from the outlet. This internal oil return channel reduces or eliminates the impact of pressure changes within the housing on lubricating oil return, ensuring both the speed and volume of lubricating oil returning to the oil sump. Furthermore, the outlet's location on the side of the motor opposite the first support allows the lubricating oil to flow directly back to the oil sump without passing through the outer surface or gaps of the motor, thus increasing the return speed and reducing the discharge volume. In other words, the pump assembly proposed in this application, by setting an oil return channel inside the crankshaft and placing the oil outlet end of the oil return channel below the motor section, can increase the amount and speed of lubricating oil return, reduce the amount of oil discharged, and thus improve the reliability of the scroll compressor.

[0008] In some embodiments, the pump body assembly may optionally include: a second bracket, the second bracket having a first shaft hole, the rotating shaft further including a second end, the second end being disposed in the first shaft hole, the second bracket being located on the side of the motor part away from the first bracket; a thrust plate, connected to the second bracket, located on the side of the second end away from the first end; wherein the oil outlet is located within the space enclosed by the second bracket and the thrust plate.

[0009] In this embodiment, the pump body assembly further includes a second bracket and a thrust plate. The second bracket has a first shaft hole, and the crankshaft's rotating shaft portion also includes a second end opposite to the first end. The second end is rotatably disposed within the first shaft hole and supported by the second bracket, which is located on the side of the motor portion away from the first bracket. The thrust plate is connected to the second bracket and is located on the side of the second end of the rotating shaft portion away from the first end, used to bear the axial force of the crankshaft. The oil outlet of the oil return channel is located within the space enclosed by the second bracket and the thrust plate. Thus, the lubricating oil flowing from the oil outlet directly enters this sealed or semi-sealed space and can then smoothly drain into the oil sump below. This provides collection and guidance for the oil return, further preventing lubricating oil splashing or disturbance from the fluid inside the casing, ensuring a smooth oil return path, improving oil return efficiency, and reducing oil discharge.

[0010] In some embodiments, optionally, the oil outlet end penetrates through the end face of the second end, the thrust plate is provided with an oil outlet channel, the oil outlet channel is connected to the oil pool, and the oil outlet end is connected to the oil outlet channel.

[0011] In this embodiment, the oil outlet end of the oil return channel directly penetrates the end face of the second end of the crankshaft's rotating shaft. Simultaneously, an oil outlet channel is provided on the thrust plate, connected to the oil outlet end and the oil sump. This allows the lubricating oil flowing from the oil return channel inside the crankshaft to directly enter the oil outlet channel of the thrust plate through the oil outlet end, and then be directly guided back to the oil sump via the oil outlet channel. This shortens the oil return path length, reduces the risk of oil spillage, and ensures the oil return rate. Furthermore, placing the oil return end on the end face of the second end, so that the oil return end and the oil inlet end are positioned opposite each other along the axial direction, helps reduce oil return resistance and facilitates the manufacturing of the oil return channel, reducing processing difficulty.

[0012] In some embodiments, the oil outlet channel is optionally a groove, which is provided on the side of the thrust plate facing the shaft portion, and extends from the middle of the thrust plate to the outer periphery of the thrust plate.

[0013] In this embodiment, the oil outlet channel on the thrust plate is a groove formed on the surface of the thrust plate facing the shaft portion. The groove starts from the middle region of the thrust plate and extends radially to the outer circumferential edge of the thrust plate, allowing the lubricating oil flowing out from the oil outlet end to be discharged from the outer periphery of the thrust plate along the groove and flow back to the oil sump of the scroll compressor. This grooved flow guiding structure avoids irregular overflow or accumulation of lubricating oil between the second end face of the thrust plate and the shaft portion, provides a flow path for the lubricating oil, helps reduce the amount of lubricating oil remaining on the surface of the thrust plate, and thus improves the oil return efficiency.

[0014] In some embodiments, optionally, the extension direction of the oil return channel is parallel to the axis of the crankshaft, or the extension direction of the oil return channel has a preset angle with the axis of the crankshaft, the preset angle being less than 5°.

[0015] In this embodiment, the extension direction of the oil return channel is configured to be parallel to the crankshaft axis, or to form a preset angle of less than 5° with the crankshaft axis, so that when the lubricating oil flows in the oil return channel, the flow direction is consistent with the rotation axis of the crankshaft. When the oil return channel is parallel to the crankshaft axis, the flow resistance of the lubricating oil is relatively small; while when there is a very small angle, it can avoid other internal bore systems of the crankshaft, such as oil supply channels or local structures.

[0016] In some embodiments, the oil return channel may optionally include: a first channel, with an oil inlet end located in the first channel, the first channel extending along the axial direction of the crankshaft; and a second channel connected to the first channel, with an oil outlet end located in the second channel, the second channel extending along the radial direction of the crankshaft, so that the oil outlet end is located on the outer peripheral wall of the rotating shaft portion and connected to the first shaft hole.

[0017] In this embodiment, the oil return channel includes a first channel and a second channel. The first channel extends along the axial direction of the crankshaft, and its oil inlet is located therein to receive lubricating oil collected from the cavity of the first bracket. The second channel is connected to the first channel and extends radially along the crankshaft, with an oil outlet at its end. This allows the lubricating oil to be discharged from the outlet located on the outer peripheral wall of the rotating shaft portion and connected to the first shaft hole area of ​​the second bracket. This arrangement reduces the difficulty of machining a single complex deep hole. The axial hole of the first channel and the radial hole of the second channel can be machined separately, which is beneficial to improving machining accuracy and manufacturing efficiency. Furthermore, by placing the oil outlet on the outer peripheral wall of the rotating shaft portion and connecting it to the first shaft hole, the discharged lubricating oil can directly lubricate the bearing mating surface between the first shaft hole of the second bracket and the crankshaft rotating shaft portion, achieving an organic combination of oil return and lubrication and improving lubrication efficiency.

[0018] In some embodiments, the pump body assembly may optionally include: a bearing disposed in a first shaft hole, the bearing being sleeved on the outside of the rotating shaft portion; wherein, along the axial direction, the second channel is located on the side of the bearing away from the motor portion.

[0019] In this embodiment, the pump assembly also includes a bearing disposed within the first shaft hole. The bearing is sleeved on the outside of the crankshaft's rotating portion to support the crankshaft's rotation. Along the crankshaft's axial direction, the second channel of the oil return passage is arranged on the side of the bearing furthest from the motor portion. This ensures that when the lubricating oil flowing from the first channel is discharged through the second channel, its outlet is located on the side of the bearing closer to the oil sump. This effectively avoids the main rolling area of ​​the bearing, allowing the lubricating oil flowing directly from the outlet to the oil sump, thus reducing the flow resistance of the lubricating oil and promoting rapid lubricating oil return.

[0020] In some embodiments, the ratio of the cross-sectional area of ​​the second channel to the cross-sectional area of ​​the first channel is greater than or equal to 0.7 and less than or equal to 2.

[0021] In this embodiment, the ratio of the cross-sectional area of ​​the second channel to the cross-sectional area of ​​the first channel is greater than or equal to 0.7 and less than or equal to 2. This avoids drastic changes in the flow rate and pressure of the lubricating oil caused by abrupt changes in the channel cross-section. It can effectively maintain the continuity of the lubricating oil flow when it turns from the axial first channel to the radial second channel, reduce local resistance loss, and thus help maintain the smoothness and stability of the return oil. This allows the lubricating oil to flow back to the oil sump at a reasonable speed, thereby avoiding the situation where the oil level in the oil sump is too low.

[0022] It is understandable that the cross-section of the second channel is the cross-section of the second channel perpendicular to the radial direction, and the cross-section of the first channel is the cross-section of the first channel perpendicular to the axial direction.

[0023] In some embodiments, the first bracket is optionally provided with a second shaft hole, and along the axial direction of the crankshaft, the cavity is located on the side of the second shaft hole away from the motor part and communicates with the second shaft hole, and the rotating shaft part passes through the second shaft hole.

[0024] In this embodiment, the first bracket is provided with a second shaft hole. Along the axial direction of the crankshaft, the cavity is located on the side of the second shaft hole away from the motor part and is interconnected with the second shaft hole. The rotating shaft part passes through the second shaft hole, thereby supporting the crankshaft through the first bracket and allowing the crankshaft to rotate relative to the first bracket.

[0025] In some embodiments, the crankshaft may optionally include an oil supply channel, which includes a third channel and a plurality of fourth channels connected to each other; the third channel extends along the axial direction; the fourth channel extends along the radial direction of the crankshaft, at least one fourth channel penetrates the outer peripheral wall of the rotating shaft portion and communicates with the second shaft hole, and at least one fourth channel penetrates the outer peripheral wall of the eccentric portion.

[0026] In this embodiment, the crankshaft also includes an oil supply channel. The oil supply channel consists of a third channel extending along the axial direction of the crankshaft and multiple fourth channels extending radially along the crankshaft, with the third channel communicating with each of the fourth channels. At least one fourth channel penetrates the outer peripheral wall of the crankshaft's rotating portion and communicates with the second shaft hole region of the first bracket to ensure lubrication of the bearing supporting the rotating portion; simultaneously, at least another fourth channel penetrates the outer peripheral wall of the crankshaft's eccentric portion to provide lubrication for components such as the moving scroll plate mounted on the eccentric portion.

[0027] In some embodiments, optionally, in a cross section perpendicular to the axial direction, the line connecting the center of the cross section of the oil return channel and the axis of the crankshaft is the first line, and the line connecting the center of the cross section of the fourth channel and the axis of the crankshaft is the second line, wherein the included angle between the first line and the second line is greater than or equal to 90° and less than or equal to 270°.

[0028] In this embodiment, within a cross-section perpendicular to the crankshaft axis, the center of the return oil passage cross-section forms a first line with the crankshaft axis, and the center of the fourth oil supply passage cross-section forms a second line with the crankshaft axis. The angle between the first and second lines is set to be greater than or equal to 90° and less than or equal to 270°. This angle range ensures that the two passages are arranged at a large angle within the crankshaft body, making the oil passages more dispersed in the circumferential direction. This effectively avoids the problem of excessively thin local material walls and weak structural areas in the crankshaft caused by the oil passages being too close together. This layout can significantly reduce the stress concentration at the edges of the oil passages when the crankshaft is subjected to rotational forces, thereby optimizing the stress distribution of the crankshaft and improving its fatigue strength and load-bearing reliability.

[0029] In some embodiments, the ratio of the cross-sectional area of ​​the return oil passage to the cross-sectional area of ​​the supply oil passage is greater than or equal to 0.7 and less than or equal to 2.

[0030] In this embodiment, the ratio of the cross-sectional area of ​​the oil return channel to the cross-sectional area of ​​the oil supply channel is greater than or equal to 0.7 and less than or equal to 2. This ratio range ensures that the flow cross-section does not change drastically when the lubricating oil flows from the oil supply channel to the oil return channel inside the crankshaft. This effectively maintains the smoothness and continuity of the lubricating oil flow within the channel, reducing local eddies, pressure fluctuations, and flow resistance losses caused by abrupt changes in the channel cross-section. This design helps ensure smooth oil return and improves oil return efficiency. It also plays a positive role in maintaining the necessary oil supply pressure in the oil supply channel, thus contributing to improved overall reliability by improving lubrication and reducing compressor oil discharge.

[0031] In some embodiments, the cross-sectional shape of the return oil channel may optionally be any of the following: circular, elliptical, trapezoidal, square, and triangular.

[0032] In this embodiment, the cross-sectional shape of the oil return channel can be any of the following: circular, elliptical, trapezoidal, square, or triangular. Different cross-sectional shapes provide flexibility in the design of the oil return channel to adapt to different processing techniques, strength requirements, or spatial layout needs. For example, a circular cross-section has the advantages of low flow resistance and ease of processing; an elliptical cross-section can provide a larger cross-sectional area in a specific direction; a trapezoidal cross-section can utilize its sloping walls to guide flow; and square and triangular cross-sections are more advantageous for arrangement within the limited space inside the crankshaft.

[0033] According to a second aspect of the present invention, a scroll compressor is also provided, comprising: a pump body assembly as described in any of the above embodiments.

[0034] The scroll compressor provided in the second aspect of this utility model, because it includes the pump body assembly proposed in any of the above embodiments, has all the beneficial effects of the pump body assembly.

[0035] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0036] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 One of the structural schematic diagrams of a scroll compressor in the related art is shown;

[0038] Figure 2 One of the structural schematic diagrams of a crankshaft in the related art is shown;

[0039] Figure 3 The second schematic diagram of the crankshaft structure in the related technology is shown;

[0040] Figure 4 The third schematic diagram of the crankshaft structure in the related technology is shown;

[0041] Figure 5 This shows one of the structural schematic diagrams of the first support in the related technology;

[0042] Figure 6 This is a second schematic diagram of the structure of the first support in the related technology;

[0043] Figure 7 It shows Figure 6 A sectional view along line AA of the first bracket in the illustrated embodiment;

[0044] Figure 8 A schematic diagram of the thrust plate in the related art is shown;

[0045] Figure 9 It shows Figure 8 A cross-sectional view of the thrust plate in the embodiment shown from the BB direction;

[0046] Figure 10 One of the structural schematic diagrams of a scroll compressor according to an embodiment of the present invention is shown;

[0047] Figure 11 One of the structural schematic diagrams of a crankshaft according to an embodiment of the present invention is shown;

[0048] Figure 12 A second schematic diagram of the crankshaft according to an embodiment of the present invention is shown;

[0049] Figure 13 The third schematic diagram shows the structure of a crankshaft according to an embodiment of the present invention;

[0050] Figure 14 The second schematic diagram shows the structure of a scroll compressor according to an embodiment of the present invention;

[0051] Figure 15 The fourth schematic diagram shows the structure of a crankshaft according to an embodiment of the present invention;

[0052] Figure 16 The fifth schematic diagram shows the structure of a crankshaft according to an embodiment of the present invention;

[0053] Figure 17 Sixth schematic diagram of the crankshaft structure according to an embodiment of the present invention is shown;

[0054] Figure 18 One of the structural schematic diagrams of the first bracket according to an embodiment of the present invention is shown;

[0055] Figure 19 A second schematic diagram of the structure of the first bracket according to an embodiment of the present invention is shown;

[0056] Figure 20 It shows Figure 19 A CC-direction sectional view of the first bracket in the illustrated embodiment;

[0057] Figure 21 A schematic diagram of the thrust plate according to an embodiment of the present invention is shown;

[0058] Figure 22 It shows Figure 21 A DD-direction sectional view of the thrust plate in the embodiment shown;

[0059] Figure 23 The third schematic diagram shows the structure of a scroll compressor according to an embodiment of the present invention;

[0060] Figure 24 The seventh schematic diagram shows the structure of a crankshaft according to an embodiment of the present invention;

[0061] Figure 25 The eighth schematic diagram shows the structure of a crankshaft according to an embodiment of the present invention.

[0062] Among them, 1' motor section, 2' oil sump, 3' crankshaft, 36' oil supply channel, 4' first bracket, 42' cavity, 44' oil outlet hole, 5' second bracket, 6' thrust plate, 8' moving scroll, 80' bearing section, 9' upper oil plate, 1 motor section, 2 oil sump, 3 crankshaft, 30 rotating shaft section, 300 first end, 302 second end, 32 eccentric section, 34 return oil channel, 340 oil inlet end, 342 oil outlet end, 344 first channel, 346 second channel, 36 oil supply channel, 360 third channel, 362 fourth channel, 4 first bracket, 40 second shaft hole, 42 cavity, 5 second bracket, 50 first shaft hole, 6 thrust plate, 60 oil outlet channel, 600 groove, 7 bearing, 8 moving scroll, 80 bearing section, 9 upper oil plate. Detailed Implementation

[0063] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0064] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0065] The following reference Figures 10 to 25 This invention describes a pump body assembly and a scroll compressor according to some embodiments of the present invention.

[0066] like Figures 10 to 17 ,as well as Figure 23 As shown, according to one embodiment of the present invention, the present invention proposes a pump body assembly for use in a scroll compressor. The scroll compressor includes a motor section 1 and an oil sump 2. The pump body assembly includes: a crankshaft 3, including a rotating shaft section 30 and an eccentric section 32. The rotating shaft section 30 is connected to the motor section 1. The rotating shaft section 30 includes a first end 300. The eccentric section 32 is disposed on the end face of the first end 300 and is eccentrically disposed relative to the rotating shaft section 30. A first support 4 is provided with a cavity 42. At least a portion of the eccentric section 32 is disposed in the cavity 42. The crankshaft 3 is provided with an oil return channel 34, which includes an oil inlet end 340 and an oil outlet end 342. The oil inlet end 340 penetrates the end face of the first end 300 and communicates with the cavity 42. The oil inlet end 340 is disposed to avoid the eccentric section 32. The oil outlet end 342 is located on the rotating shaft section 30 and communicates with the oil sump 2. The oil outlet end 342 is located on the side of the motor section 1 away from the first support 4.

[0067] The pump assembly provided by this utility model includes a crankshaft 3 and a first bracket 4. The crankshaft 3 includes a rotating shaft portion 30 and an eccentric portion 32. The rotating shaft portion 30 is connected to the motor portion 1 to transmit power. The eccentric portion 32 is disposed on the end face of the first end 300 of the rotating shaft portion 30, and the eccentric portion 32 is eccentrically disposed relative to the central axis L2 of the rotating shaft portion 30 to drive the moving scroll 8 of the pump assembly. The first bracket 4 is a supporting structure for the pump assembly, and the first bracket 4 is provided with a cavity 42. At least a portion of the eccentric portion 32 is accommodated in the cavity 42, thereby realizing the support of the crankshaft 3 by the first bracket 4. The crankshaft 3 is equipped with an oil return channel 34, which includes an oil inlet end 340 and an oil outlet end 342. The oil inlet end 340 is connected to the cavity 42, and the oil outlet end 342 is connected to the oil sump 2. The oil inlet end 340 is located at the end face of the first end 300 of the rotating shaft part 30, avoiding the eccentric part 32. The oil outlet end 342 is located on the rotating shaft part 30 and on the side of the motor part 1 away from the first bracket 4. In this way, when the pump body assembly is working, the lubricating oil is lubricated at the pump body assembly and then collects in the cavity 42 of the first bracket 4. Under the action of pressure or gravity, it enters the oil return channel 34 from the oil inlet end 340 and returns to the oil sump 2 from the oil outlet end 342 along the oil return channel 34. That is, the lubricating oil flows back to the oil sump 2 through the oil return channel 34 inside the crankshaft 3, thereby reducing or avoiding the influence of pressure changes in the housing on the lubricating oil return and ensuring the speed and amount of lubricating oil returning to the oil sump 2. Furthermore, the oil outlet 342 is located on the side of the motor unit 1 away from the first bracket 4, allowing the lubricating oil to flow directly back to the oil sump 2 after exiting from the oil outlet 342, without needing to flow back to the oil sump 2 through the outer surface or gap of the motor unit 1. This increases the oil return speed and reduces the oil discharge volume. In other words, the pump assembly proposed in this application, by providing an oil return channel 34 inside the crankshaft 3 and positioning the oil outlet 342 of the oil return channel 34 below the motor unit 1, can increase the oil return volume and speed of the lubricating oil, reduce the oil discharge volume, and thereby improve the reliability of the scroll compressor.

[0068] It is understandable that, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 and Figure 9As shown, in the related technology, the crankshaft 3' of the scroll compressor is supported in the housing by the first bracket 4' and the second bracket 5'. The motor part 1' drives the crankshaft 3' to rotate. The eccentric part of the crankshaft 3' is connected to the moving scroll 8', and the other end of the crankshaft 3' is provided with a thrust plate 6'. The crankshaft 3' has an axial oil supply channel 36', and an upper oil plate 9' is installed in the oil supply channel 36'. The outer circle of the crankshaft 3' has a radial hole, which communicates with the oil supply channel 36', the first bracket 4', the second bracket 5', and the bearing part 80' of the moving scroll 8'. The refrigerant oil in the oil sump 2' flows through the upper oil plate 9', the oil supply channel 36', and the radial hole into the bearing holes of the first bracket 4', the second bracket 5', and the moving scroll 8' under the action of the upper oil plate 9'. Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, the first support 4' has a cavity 42' above the bearing hole for receiving the refrigerant oil flowing out of the bearing holes of the first support 4' and the moving scroll 8'. The first support 4' has an oil outlet 44' in the radial direction, which communicates with the cavity 42'. After the refrigerant oil level rises to the oil outlet 44' of the cavity 42', it flows out from the oil outlet 44' and flows back to the oil sump 2' along the inner wall of the casing. Because there is a high-speed fluid flowing inside the casing, the pressure inside the casing changes rapidly, which disturbs the refrigerant oil return flow and also entrains some refrigerant oil, causing some refrigerant oil to be discharged from the scroll compressor with the fluid, affecting the oil return speed, increasing the oil discharge of the scroll compressor, and reducing the reliability of the scroll compressor. In the embodiment proposed in this application, by setting an oil return channel 34 on the crankshaft 3, the refrigerant oil return speed and oil return rate can be improved, and the refrigerant oil can be prevented from being entrained by the fluid, thus reducing the oil discharge of the scroll compressor.

[0069] In addition, such as Figure 18 , Figure 19 and Figure 20 As shown, the pump assembly proposed in this embodiment does not require an oil outlet hole on the first bracket 4, thereby improving the strength of the first bracket 4.

[0070] like Figure 10 and Figure 14 As shown, in some embodiments, optionally, the pump body assembly further includes: a second bracket 5, the second bracket 5 having a first shaft hole 50, the rotating shaft 30 further including a second end 302, the second end 302 being disposed within the first shaft hole 50, the second bracket 5 being located on the side of the motor part 1 opposite to the first bracket 4; a thrust plate 6, connected to the second bracket 5, located on the side of the second end 302 opposite to the first end 300; wherein, the oil outlet end 342 is located within the space enclosed by the second bracket 5 and the thrust plate 6.

[0071] In this embodiment, the pump body assembly further includes a second bracket 5 and a thrust plate 6. The second bracket 5 has a first shaft hole 50. The crankshaft 3's rotating shaft portion 30 also includes a second end 302 opposite to the first end 300. The second end 302 is rotatably disposed within the first shaft hole 50 and is supported by the second bracket 5. The second bracket 5 is located on the side of the motor portion 1 opposite to the first bracket 4. The thrust plate 6 is connected to the second bracket 5 and is located on the side of the second end 302 of the rotating shaft portion 30 opposite to the first end 300, for bearing the axial force of the crankshaft 3. The oil outlet 342 of the oil return channel 34 is located in the space enclosed by the second bracket 5 and the thrust plate 6. In this way, the lubricating oil flowing out from the oil outlet 342 will directly enter the closed or semi-closed space and then smoothly flow into the oil sump 2 below. This provides a collection and guiding function for the return oil, which can further prevent the lubricating oil from splashing or being disturbed by the fluid inside the shell, ensuring the smoothness of the return oil path, which is conducive to improving the return oil efficiency and reducing the amount of oil discharged.

[0072] like Figure 11 , Figure 12 , Figure 13 , Figure 15 , Figure 16 and Figure 17 As shown, in some embodiments, optionally, the oil outlet end 342 penetrates the end face of the second end 302, the thrust plate 6 is provided with an oil outlet channel 60, the oil outlet channel 60 is connected to the oil pool 2, and the oil outlet end 342 is connected to the oil outlet channel 60.

[0073] In this embodiment, the oil outlet 342 of the oil return channel 34 directly penetrates the end face of the second end 302 of the crankshaft 3's rotating shaft portion 30. Simultaneously, the thrust plate 6 is provided with an oil outlet channel 60, which communicates with the oil outlet 342 and the oil sump 2. This allows the lubricating oil flowing from the oil return channel 34 inside the crankshaft 3 to directly enter the oil outlet channel 60 of the thrust plate 6 through the oil outlet 342, and then be directly guided back to the oil sump 2 via the oil outlet channel 60. This shortens the oil return path length, reduces the risk of oil spillage, and ensures the oil return rate. Furthermore, placing the oil return end on the end face of the second end 302, so that the oil return end and the oil inlet end 340 are positioned opposite each other along the axis L2, helps reduce oil return resistance and facilitates the manufacturing of the oil return channel 34, reducing processing difficulty.

[0074] like Figure 21 and Figure 22 As shown, in some embodiments, the oil outlet channel 60 is optionally a groove 600, which is provided on the side of the thrust plate 6 facing the rotating shaft portion 30, and the groove 600 extends from the middle of the thrust plate 6 to the outer periphery of the thrust plate 6.

[0075] In this embodiment, the oil outlet channel 60 on the thrust plate 6 is a groove 600 formed on the surface of the thrust plate 6 facing the shaft portion 30. The groove 600 starts from the middle region of the thrust plate 6 and extends radially to the outer circumferential edge of the thrust plate 6, so that the lubricating oil flowing out from the oil outlet end 342 can be discharged from the outer periphery of the thrust plate 6 along the groove 600 and flow back to the oil sump 2 of the scroll compressor. This groove 600-type flow guiding structure avoids the irregular overflow or accumulation of lubricating oil between the thrust plate 6 and the second end 302 end face of the shaft portion 30, provides a flow path for the lubricating oil, helps to reduce the amount of lubricating oil remaining on the surface of the thrust plate 6, thereby improving the oil return efficiency.

[0076] In some embodiments, the oil outlet channel 60 is optionally a through hole that extends through the thrust plate 6 along the axis L2.

[0077] In this embodiment, the oil outlet channel 60 of the thrust plate 6 is a through hole extending through the thrust plate 6 along the axis L2 of the crankshaft 3. The through hole allows the lubricating oil flowing from the return oil channel 34 of the crankshaft 3 to the thrust plate 6 to flow back to the oil sump 2 almost linearly and axially through the thrust plate 6, greatly shortening and simplifying the flow path of the lubricating oil at the end of the pump assembly. This design reduces the retention and accumulation of lubricating oil near the thrust plate 6, helping to accelerate the return oil speed. At the same time, the through hole structure is relatively simple to manufacture, which helps to control production costs.

[0078] In some embodiments, optionally, the extension direction L1 of the oil return channel 34 is parallel to the axis L2 of the crankshaft 3, or there is a preset angle between the extension direction L1 of the oil return channel 34 and the axis L2 of the crankshaft 3, wherein the preset angle is less than 5°.

[0079] In this embodiment, the extension direction L1 of the oil return channel 34 is configured to be parallel to the axis L2 of the crankshaft 3, or to form a preset angle of less than 5° with the axis L2 of the crankshaft 3, so that when the lubricating oil flows in the oil return channel 34, the flow direction is consistent with the rotation axis L2 of the crankshaft 3. When the oil return channel 34 is parallel to the axis L2 of the crankshaft 3, the flow resistance of the lubricating oil is relatively small; while when there is a very small angle, it can avoid other hole systems inside the crankshaft 3, such as the oil supply channel 36 or local structures.

[0080] like Figure 23 , Figure 24 and Figure 25As shown, in some embodiments, optionally, the oil return channel 34 includes: a first channel 344, with an oil inlet end 340 disposed in the first channel 344, the first channel 344 extending along the axis L2 direction; a second channel 346 connected to the first channel 344, with an oil outlet end 342 disposed in the second channel 346, the second channel 346 extending along the radial direction of the crankshaft 3, so that the oil outlet end 342 is located on the outer peripheral wall of the rotating shaft portion 30 and connected to the first shaft hole 50.

[0081] In this embodiment, the oil return channel 34 includes a first channel 344 and a second channel 346. The first channel 344 extends along the axis L2 of the crankshaft 3, and an oil inlet 340 is disposed in the first channel 344 to receive lubricating oil collected from the cavity 42 of the first support 4. The second channel 346 communicates with the first channel 344 and extends radially along the crankshaft 3, with an oil outlet 342 at its end, so that the lubricating oil is finally discharged from the oil outlet 342 located on the outer peripheral wall of the rotating shaft portion 30 and communicates with the first shaft hole 50 area of ​​the second support 5. This arrangement can reduce the difficulty of machining a single complex deep hole, and the axial hole of the first channel 344 and the radial hole of the second channel 346 can be machined separately, which is beneficial to improving machining accuracy and manufacturing efficiency. In addition, by setting the oil outlet 342 on the outer peripheral wall of the rotating shaft 30 and connecting it with the first shaft hole 50, the discharged lubricating oil can directly lubricate the bearing 7 mating surface between the first shaft hole 50 of the second bracket 5 and the rotating shaft 30 of the crankshaft 3, thus realizing the organic combination of oil return and lubrication and improving lubrication efficiency.

[0082] In some embodiments, the pump body assembly may optionally include: a bearing 7 disposed in the first shaft hole 50, the bearing 7 being sleeved on the outside of the rotating shaft portion 30; wherein, along the axis L2 direction, the second channel 346 is located on the side of the bearing 7 away from the motor portion 1.

[0083] In this embodiment, the pump assembly also includes a bearing 7 disposed within the first shaft hole 50. The bearing 7 is sleeved on the outside of the rotating shaft portion 30 of the crankshaft 3 to support the rotation of the crankshaft 3. Along the axis L2 of the crankshaft 3, the second channel 346 of the oil return channel 34 is arranged on the side of the bearing 7 away from the motor portion 1. This ensures that when the lubricating oil flowing from the first channel 344 is discharged through the second channel 346, its outlet end 342 is located on the side of the bearing 7 closer to the oil sump 2. This effectively avoids the main rolling area of ​​the bearing 7, allowing the lubricating oil flowing directly from the outlet end 342 to the oil sump 2, thus reducing the flow resistance of the lubricating oil and promoting rapid return of the lubricating oil.

[0084] In some embodiments, the ratio of the area of ​​the cross-section of the second channel 346 to the area of ​​the cross-section of the first channel 344 is greater than or equal to 0.7 and less than or equal to 2.

[0085] In this embodiment, the ratio of the cross-sectional area of ​​the second channel 346 to the cross-sectional area of ​​the first channel 344 is greater than or equal to 0.7 and less than or equal to 2. This avoids drastic changes in the flow rate and pressure of the lubricating oil caused by abrupt changes in the channel cross-section. It can effectively maintain the continuity of the lubricating oil flow when it turns from the axial first channel 344 to the radial second channel 346, reduce local resistance loss, and thus help maintain the smoothness and stability of the return oil. This allows the lubricating oil to flow back to the oil sump 2 at a reasonable speed, thereby avoiding the situation where the oil level in the oil sump 2 is too low.

[0086] It is understandable that the cross-section of the second channel 346 is a cross-section of the second channel 346 perpendicular to the radial direction, and the cross-section of the first channel 344 is a cross-section of the first channel 344 perpendicular to the axis L2 direction.

[0087] In some embodiments, the first bracket 4 is optionally provided with a second shaft hole 40. Along the axial direction of the crankshaft 3, the cavity is located on the side of the second shaft hole 40 away from the motor part and is connected to the second shaft hole 40. The rotating shaft part 30 passes through the second shaft hole 40.

[0088] In this embodiment, the first bracket 4 is provided with a second shaft hole 40. Along the axial direction of the crankshaft 3, the cavity is located on the side of the second shaft hole 40 away from the motor part and is interconnected with the second shaft hole 40. The rotating shaft part 30 passes through the second shaft hole 40, thereby supporting the crankshaft 3 through the first bracket 4 and allowing the crankshaft 3 to rotate relative to the first bracket 4.

[0089] like Figure 10 , Figure 11 and Figure 14 As shown, in some embodiments, optionally, the crankshaft 3 is further provided with an oil supply channel 36, which includes a third channel 360 and a plurality of fourth channels 362 connected to each other; the third channel 360 extends along the axis L2 direction; the fourth channels 362 extend along the radial direction of the crankshaft 3, at least one fourth channel 362 penetrates the outer peripheral wall of the rotating shaft portion 30 and communicates with the second shaft hole 40, and at least one fourth channel 362 penetrates the outer peripheral wall of the eccentric portion 32.

[0090] In this embodiment, the crankshaft 3 is also provided with an oil supply channel 36. The oil supply channel 36 consists of a third channel 360 extending along the axis L2 of the crankshaft 3 and a plurality of fourth channels 362 extending along the radial direction of the crankshaft 3, and the third channel 360 and each of the fourth channels 362 are interconnected. At least one fourth channel 362 penetrates the outer peripheral wall of the rotating shaft portion 30 of the crankshaft 3 and communicates with the second shaft hole 40 area of ​​the first bracket 4 to ensure lubrication of the bearing supporting the rotating shaft portion 30; at the same time, at least another fourth channel 362 penetrates the outer peripheral wall of the eccentric portion 32 of the crankshaft 3 to provide lubrication for components such as the moving scroll plate sleeved on the eccentric portion 32.

[0091] like Figure 13 As shown, in some embodiments, optionally, in a cross section perpendicular to the axis L2, the line connecting the center of the cross section of the oil return channel 34 and the axis L2 of the crankshaft 3 is the first connecting line L3, and the line connecting the center of the cross section of the fourth channel 362 and the axis L2 of the crankshaft 3 is the second connecting line L4. The included angle between the first connecting line L3 and the second connecting line L4 is greater than or equal to 90° and less than or equal to 270°.

[0092] In this embodiment, within a cross-section perpendicular to the axis L2 of the crankshaft 3, the center of the cross-section of the oil return channel 34 is connected to the axis L2 of the crankshaft 3 to form a first line L3, and the center of the cross-section of the fourth channel 362 of the oil supply channel 36 is connected to the axis L2 of the crankshaft 3 to form a second line L4. The angle between the first line L3 and the second line L4 is set to be greater than or equal to 90° and less than or equal to 270°. This angle range ensures that the two channels are arranged at a large angle within the crankshaft 3 body, making the oil passages more dispersed in the circumferential distribution. This effectively avoids the problem of excessively thin local material walls and weak structural areas in the crankshaft 3 caused by the oil passages being too close together. This layout can significantly reduce the stress concentration at the edges of the oil passages when the crankshaft 3 is subjected to rotational forces, thereby optimizing the stress distribution of the crankshaft 3 and improving the fatigue strength and load-bearing reliability of the crankshaft 3.

[0093] It is understandable that by setting the angle between the first connection L3 and the second connection L4 to be greater than or equal to 90° and less than or equal to 270°, the oil return channel 34 can be arranged in a region with high strength of the crankshaft 3, thereby ensuring the overall reliability of the crankshaft 3.

[0094] In some embodiments, the ratio of the cross-sectional area of ​​the return oil channel 34 to the cross-sectional area of ​​the supply oil channel 36 is greater than or equal to 0.7 and less than or equal to 2.

[0095] In this embodiment, the ratio of the cross-sectional area of ​​the oil return channel 34 to the cross-sectional area of ​​the oil supply channel 36 is greater than or equal to 0.7 and less than or equal to 2. This ratio range ensures that when the lubricating oil flows inside the crankshaft 3, the flow cross-section does not change drastically during the transition from the oil supply channel 36 to the oil return channel 34. This effectively maintains the smoothness and continuity of the lubricating oil flow within the channel, reducing local eddies, pressure fluctuations, and flow resistance losses caused by abrupt changes in the channel cross-section. This design helps ensure smooth oil return and improves oil return efficiency. It also plays a positive role in maintaining the necessary oil supply pressure in the oil supply channel 36, thus contributing to improved overall reliability by improving lubrication and reducing compressor oil discharge.

[0096] In some embodiments, the cross-sectional shape of the return oil channel 34 may be any of the following: circular, elliptical, trapezoidal, square, and triangular.

[0097] In this embodiment, the cross-sectional shape of the oil return channel 34 can be any one of circular, elliptical, trapezoidal, square, or triangular. Different cross-sectional shapes provide flexibility in the design of the oil return channel 34 to adapt to different processing techniques, strength requirements, or spatial layout needs. For example, a circular cross-section has the advantages of low flow resistance and ease of processing; an elliptical cross-section can provide a larger cross-sectional area in a specific direction; a trapezoidal cross-section can utilize its sloping walls to guide flow; and square and triangular cross-sections are more advantageous for arrangement within the limited space inside the crankshaft 3.

[0098] According to one embodiment of the present invention, a scroll compressor is also provided, comprising: a pump body assembly as described in any of the above embodiments.

[0099] The scroll compressor provided by this utility model, because it includes the pump body assembly proposed in any of the above embodiments, has all the beneficial effects of the pump body assembly.

[0100] In some embodiments, optionally, this application eliminates the original oil return path from the side of the first bracket 4 by adding an oil return channel 34 on the crankshaft 3, thereby avoiding the disturbance of the lubricating oil return process by the fluid in the housing, increasing the oil return speed, reducing the oil discharge of the scroll compressor, and improving the reliability of the scroll compressor.

[0101] Optionally, such as Figures 10 to 22As shown, the scroll compressor includes: a crankshaft 3, an upper oil plate 9, a thrust plate 6, a moving scroll 8, a second bracket 5, an oil sump 2, and a first bracket 4. The crankshaft 3 is divided into an upper eccentric section 32 and a lower rotating shaft section 30. The rotating shaft section 30 includes a main shaft, a secondary shaft, and a rotor section. The oil supply channel 36 inside the crankshaft 3 extends through the crankshaft 3 along the axis L2. The upper oil plate 9 is installed on the thrust surface of the oil supply channel 36 near the bottom of the crankshaft 3. The outer circle of the crankshaft 3 has radial holes at positions that mate with the second shaft hole 40 of the first bracket 4, the first shaft hole 50 of the second bracket 5, and the third shaft hole of the moving scroll 8. These radial holes communicate with the oil supply channel 36. The crankshaft 3 also has axially penetrating oil return channels 34 in the main shaft, secondary shaft, and rotor section.

[0102] The thrust plate 6 has a groove 600 on its surface. The thrust plate 6 is installed on the lower end face of the second bracket 5, and the surface of the thrust plate 6 with the groove 600 mates with the thrust surface of the crankshaft 3 to support the crankshaft 3. The lower part of the thrust plate 6 and the second bracket 5 is immersed in the oil bath 2. The lower part of the moving scroll 8 is a bearing part 80, and the third shaft hole of the bearing part 80 is clearance-fitted with the eccentric part 32 of the crankshaft 3. The upper part of the second shaft hole 40 is provided with a cavity 42, in which the eccentric part 32 of the crankshaft 3 and the bearing part 80 of the moving scroll 8 are located. The cavity 42 can accommodate the refrigerant oil discharged from the bearing of the first bracket 4 and the shaft hole of the moving scroll 8. When the scroll compressor is running, the refrigerant oil enters the oil supply channel 36 of the crankshaft 3 through the upper oil plate 9, and enters the second shaft hole 40 of the first bracket 4, the first shaft hole 50 of the second bracket 5, and the third shaft hole of the moving scroll 8 through the aforementioned radial holes. The refrigerant oil discharged from the second shaft hole 40 of the first bracket 4 and the third shaft hole of the moving scroll 8 enters the cavity 42 of the first bracket 4. The cavity 42 is connected to the oil return channel 34 of the crankshaft 3, so that the refrigerant oil flows to the thrust plate 6 through the oil return channel 34. In addition, during the rotation of the crankshaft 3, the oil return channel 34 will connect with the groove 600 of the thrust plate 6, so that the refrigerant oil flows back to the oil sump 2.

[0103] like Figures 10 to 13 As shown, in some embodiments, the oil return channel 34 of the crankshaft 3 is a single cylindrical shape, with its centerline parallel to the axis L2 of the crankshaft 3.

[0104] like Figures 14 to 17 As shown, in some embodiments, the cross-section of the oil return channel 34 of the crankshaft 3 can be waist-shaped or other shapes, and the center line is parallel to the axis L2 of the crankshaft 3.

[0105] In some embodiments, the oil return channel 34 of the crankshaft 3 can be a combination type, for example, the oil return channel 34 has multiple channel segments, and the center lines of each channel segment may not coincide.

[0106] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0107] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0108] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pump body assembly, characterized in that, The pump assembly is used in a scroll compressor, the scroll compressor including a motor unit and an oil sump, and the pump assembly includes: A crankshaft includes a shaft portion and an eccentric portion. The shaft portion is connected to the motor portion. The shaft portion includes a first end. The eccentric portion is disposed on the end face of the first end and is eccentrically disposed relative to the shaft portion. The first support has a cavity, and at least a portion of the eccentric portion is disposed within the cavity; The crankshaft is provided with an oil return channel, which includes an oil inlet end and an oil outlet end. The oil inlet end passes through the end face of the first end and is connected to the cavity. The oil inlet end is arranged to avoid the eccentric part. The oil outlet end is located in the rotating shaft part and is connected to the oil sump. The oil outlet end is located on the side of the motor part away from the first bracket.

2. The pump body assembly according to claim 1, characterized in that, Also includes: The second bracket has a first shaft hole, and the rotating shaft also includes a second end, which is disposed in the first shaft hole. The second bracket is located on the side of the motor part away from the first bracket. A thrust plate, connected to the second bracket, is located on the side of the second end opposite to the first end; The oil outlet is located within the space formed by the second bracket and the thrust plate.

3. The pump body assembly according to claim 2, characterized in that, The oil outlet end penetrates the end face of the second end, the thrust plate is provided with an oil outlet channel, the oil outlet channel is connected to the oil pool, and the oil outlet end is connected to the oil outlet channel.

4. The pump body assembly according to claim 3, characterized in that, The oil outlet channel is a groove, which is located on the side of the thrust plate facing the rotating shaft, and extends from the middle of the thrust plate to the outer periphery of the thrust plate.

5. The pump body assembly according to claim 3, characterized in that, The extension direction of the oil return channel is parallel to the axis of the crankshaft, or the extension direction of the oil return channel has a preset angle with the axis of the crankshaft, wherein the preset angle is less than 5°.

6. The pump body assembly according to claim 2, characterized in that, The oil return channel includes: The first channel, wherein the oil inlet is located in the first channel, and the first channel extends along the axial direction of the crankshaft; The second channel is connected to the first channel, and the oil outlet is located in the second channel. The second channel extends in the radial direction of the crankshaft so that the oil outlet is located on the outer peripheral wall of the rotating shaft and is connected to the first shaft hole.

7. The pump body assembly according to claim 6, characterized in that, Also includes: A bearing is disposed in the first shaft hole, and the bearing is sleeved on the outside of the rotating shaft portion; Along the axial direction, the second channel is located on the side of the bearing away from the motor section.

8. The pump body assembly according to claim 6, characterized in that, The ratio of the cross-sectional area of ​​the second channel to the cross-sectional area of ​​the first channel is greater than or equal to 0.7 and less than or equal to 2.

9. The pump body assembly according to any one of claims 1 to 8, characterized in that, The first bracket is provided with a second shaft hole; Along the axial direction of the crankshaft, the cavity is located on the side of the second shaft hole away from the motor part and is connected to the second shaft hole, and the rotating shaft part passes through the second shaft hole.

10. The pump body assembly according to claim 9, characterized in that, The crankshaft is also provided with an oil supply channel, which includes a third channel and multiple fourth channels that are connected to each other. The third channel extends along the axis direction; The fourth channel extends along the radial direction of the crankshaft, at least one of the fourth channels penetrates the outer peripheral wall of the rotating shaft portion and communicates with the second shaft hole, and at least one of the fourth channels penetrates the outer peripheral wall of the eccentric portion.

11. The pump body assembly according to claim 10, characterized in that, In a cross section perpendicular to the axis, the line connecting the center of the oil return channel cross section to the axis of the crankshaft is the first line, and the line connecting the center of the fourth channel cross section to the axis of the crankshaft is the second line. The angle between the first line and the second line is greater than or equal to 90° and less than or equal to 270°.

12. The pump body assembly according to claim 10, characterized in that, The ratio of the cross-sectional area of ​​the return oil channel to the cross-sectional area of ​​the supply oil channel is greater than or equal to 0.7 and less than or equal to 2.

13. The pump body assembly according to any one of claims 1 to 8, characterized in that, The cross-sectional shape of the oil return channel is any of the following: Circles, ovals, trapezoids, squares, and triangles.

14. A scroll compressor, characterized in that, include: The pump body assembly as described in any one of claims 1 to 13.

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