Pump body assembly, rolling piston compressor, air conditioner

Abstract

The application provides a pump body assembly, a rolling rotor compressor and an air conditioner. The pump body assembly comprises an upper flange, a crankshaft, a crankshaft assembly hole formed on the upper flange, the crankshaft being rotatably assembled in the crankshaft assembly hole, the crankshaft having an eccentric part, the crankshaft having a central oil feeding blind hole extending along the axial direction of the crankshaft, a flexible groove in the form of a circular ring being formed on the end face of the first end, an oil storage ring groove being formed on the inner wall of the hole opening adjacent to the second end of the crankshaft assembly hole, an oil return groove being formed on the hole wall of the crankshaft assembly hole, a side oil hole being formed at the bottom of the central oil feeding blind hole, and the lubricating oil pumped in the central oil feeding blind hole being sequentially returned to the oil pool at least partially through the side oil hole, the oil storage ring groove and the oil return groove. The application can pump the lubricating oil in the oil pool to the bottom end of the crankshaft, and then guide the lubricating oil to return to the oil pool below through the oil return groove to realize the internal circulation of the lubricating oil. The lubricating oil in the oil return groove is in contact with the matched crankshaft section to realize sufficient lubrication, and there is no short circuit of multiple oil paths.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of compressor design, and particularly relates to a pump body assembly, a rolling rotor type compressor and an air conditioner. BACKGROUND

[0002] A conventional rolling rotor type compressor is mainly composed of a pump body assembly, a motor assembly, a distributor component, a shell assembly, an upper cover, a lower cover and the like. The shell assembly cooperates with the upper and lower covers to form a closed structure, and the inside of the shell is mainly composed of two parts of the pump body assembly and the motor assembly. The pump body assembly includes main components such as an upper flange, a cylinder, a crankshaft, a roller and a lower flange, and the components cooperate with each other to form a closed cavity. The motor assembly includes a stator assembly and a rotor assembly. The rotating compressor is driven by the electromagnetic force generated between the motor rotor assembly and the stator assembly, and the driving force is generated on the pump body crankshaft. Under the rotating driving action of the crankshaft, the volume of the pump body cavity changes periodically to periodically suck, compress and discharge air.

[0003] The lubrication between the friction pairs of the compressor pump body mainly relies on the oil passage in the pump body to pump lubricating oil to the contact surface of the moving part, thereby achieving the effects of lubrication, cooling and heat dissipation. The main and auxiliary bearing oil passage structure of the conventional rolling rotor type compressor is as follows: the crankshaft is provided with a central oil hole, the long and short shaft root portions of the crankshaft are respectively designed with side oil holes which are communicated with the central oil hole of the crankshaft, and the pump oil device is assembled in the central oil hole. The inner circular surface of the upper flange and the lower flange is respectively provided with an oil groove. A certain amount of lubricating oil is arranged in the lower part of the shell. When the compressor operates, the lubricating oil in the bottom oil pool is pumped into the central oil hole under the action of the pump oil device in the central oil hole of the crankshaft, and then pumped to the end of the inner circular surface of the lower flange and the upper flange through the side oil holes of the long and short shaft root portions of the crankshaft, respectively. Then, the lubricating oil is pumped to the surface of the friction pairs (main and auxiliary bearings) of the upper and lower flanges and the long and short shafts of the crankshaft through the oil grooves on the upper and lower flanges, respectively, thereby realizing the oil passage lubrication of the main and auxiliary bearings.

[0004] When the compressor operates at a high frequency, a large amount of heat energy is generated by the friction of the moving parts. If the oil pumping amount is insufficient, the heat dissipation is insufficient, the pump body is rapidly heated, the working cavity of the cylinder is heated, the volumetric efficiency is reduced, and at the same time, the exhaust temperature is rapidly increased, which reduces the efficiency of the motor and ultimately reduces the performance of the compressor. At the same time, under high frequency, the contact surfaces of the moving parts have higher requirements for lubrication, especially between the crankshaft and the upper flange, sufficient lubricating oil needs to be provided for lubrication.

[0005] In addition, when the compressor is running, the cavity is filled with oil droplets, one of the main sources of which is the lubricating oil passage of the pump body directly communicating with the lower cavity of the motor. Under the action of centrifugal force and gas force, the oil in the lubricating oil passage enters the upper cavity of the motor and is then discharged into the system, thereby causing the oil discharge rate of the compressor to be high during high-frequency operation, reducing the performance of the compressor, and increasing the risk of internal oil shortage of the compressor.

[0006] Based on the technical bottleneck problems existing in the conventional compressor oil passage structure under high-frequency working conditions, the applicant proposes a kind of oil return structure and a compressor with the same (patent application number 2022211069000). A crescent-shaped radial groove is formed in the inner hole wall surface below the upper end face of the flange, an oil groove with a rotation direction opposite to that of the upper spiral oil groove (which can also be a straight groove) is arranged on the inner circular surface of the flange, an oil return hole is arranged in the flange, and the oil storage groove is respectively connected with the upper spiral oil groove and the lower oil groove, and the oil return hole is respectively connected with the lower oil groove and the upper flange hollow cavity (waist-shaped hole), and then connected with the oil pool, realizing the circulation of the lubricating oil passage in the pump body, avoiding the centrifugal force and gas force of the crankshaft rotation to carry the lubricating oil into the upper and lower cavities of the motor, greatly reducing the oil content rate of the upper and lower cavities of the motor, thereby reducing the oil discharge rate of the compressor. However, due to the existence of the conventional compressor upper flange circular ring flexible groove structure, the pump body oil return innovation scheme has the problem of short circuit of multiple oil passages. Before the lubricating oil pumped out from the oil hole at the root side of the long shaft of the crankshaft enters the upper oil groove of the upper flange, a large amount of lubricating oil directly enters the oil return hole from the short circuit flow channel, returns to the oil pool through the upper flange hollow return, and then causes the pump oil of the upper oil groove of the upper flange to be greatly reduced, increases the lubrication deficiency and wear reliability risk between the contact surface of the upper flange and the long shaft friction pair of the crankshaft. To solve the above problems, in the aforementioned patent, the inventor further proposes to design the circular ring flexible groove as a local flexible groove structure (C-shaped structure), and the flexible groove structure is only arranged in the non-oil return structure area. Although this structure solves the problem of insufficient oil flow of the upper oil flow caused by the short circuit flow channel of the oil return structure, it greatly increases the contact stress between the inner circular lower end of the upper flange oil return structure area and the crankshaft root, which in turn increases the reliability problem of part wear caused by the increase of contact stress between the crankshaft and the upper flange. SUMMARY

[0007] Therefore, the present application provides a pump body assembly, a rolling rotor type compressor and an air conditioner, which can solve the technical problems of excessive contact stress between the inner circular lower end of the upper flange and the crankshaft root in the pump body assembly of the prior art based on the use of a local flexible groove to realize internal circulation of the pump body oil passage, which causes severe part wear and reduces the reliability of the pump body assembly.

[0008] To solve the above problems, the present application provides a pump body assembly, comprising an upper flange, a crankshaft, the upper flange being provided with a crankshaft assembly hole, the crankshaft being rotatably assembled in the crankshaft assembly hole, the crankshaft having an eccentric portion, the crankshaft having a central oil feeding blind hole extending along the axial direction, the upper flange having a first end near one end of the eccentric portion and a second end away from the eccentric portion, the first end being provided with a circular annular flexible groove on the end face, the crankshaft assembly hole being provided with an oil storage ring groove on the inner wall of the hole opening near the second end, the hole wall of the crankshaft assembly hole being provided with an oil return groove, the bottom of the central oil feeding blind hole being provided with a side oil hole, and the lubricating oil pumped in the central oil feeding blind hole being at least partially returned to the oil pool through the side oil hole, the oil storage ring groove and the oil return groove in sequence.

[0009] In some embodiments, the upper flange comprises a disc body and a cylinder body on the side of the disc body away from the eccentric portion, the oil return groove comprises a first groove section extending along the axial direction of the cylinder body and a second groove section extending along the radial direction of the disc body, the first end of the first groove section communicates with the oil storage ring groove, the second end of the first groove section communicates with the first end of the second groove section, and the opening of the second end of the second groove section faces the side of the oil pool.

[0010] In some embodiments, the first groove section is a spiral opening groove, and the spiral rotation direction of the spiral opening groove is opposite to the rotation direction of the crankshaft.

[0011] In some embodiments, the second groove section penetrates the flexible groove.

[0012] In some embodiments, the distance between the second end of the first groove section and the first end of the upper flange is a, the crankshaft further comprises an assembly section corresponding to the crankshaft assembly hole and a necked section between the assembly section and the eccentric portion, the distance between the end of the necked section away from the eccentric portion and the first end of the upper flange is b, and a≤b.

[0013] In some embodiments, the axial minimum distance between the side of the side oil hole away from the eccentric portion and the free end face of the cylinder body is c, the axial minimum distance between the side of the side oil hole near the eccentric portion and the groove wall of the oil storage ring groove away from the eccentric portion is d, and the axial width of the oil storage ring groove is e, c>0 and d≥0.5e.

[0014] In some embodiments, 0.01mm≤c≤0.5mm.

[0015] The present application also provides a rolling rotor compressor comprising the above pump body assembly.

[0016] The present invention also provides an air conditioner, comprising the above-mentioned rolling rotor compressor.

[0017] The present invention provides a pump body assembly, a rolling rotor compressor, and an air conditioner, wherein the upper oil hole is a blind hole structure, thereby preventing excessive lubricating oil from being pumped to the top end of the crankshaft, thereby increasing the oil discharge rate of the compressor under the action of the upper motor assembly. The central oiling blind hole can pump the lubricating oil in the oil pool to the bottom end of the crankshaft and then be guided back to the lower oil pool through the return oil groove to realize the internal circulation of the lubricating oil. The lubricating oil in the return oil groove contacts the matching crankshaft section to achieve sufficient lubrication of the contact and matching position between the crankshaft and the upper flange. Since there is no problem of short circuit of multiple oil paths being cross-connected, the technical solution adopts a circular flexible groove, which surrounds the entire circumference of the crankshaft, effectively reducing the wear of parts caused by excessive contact stress between the lower end of the inner circle of the upper flange and the root position of the crankshaft, thereby improving the reliability of the pump body assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the internal structure of the pump assembly of an embodiment of the present invention (partial), in which the arrows indicate the flow direction of the lubricating oil;

[0019] Figure 2 for Figure 1 A local enlarged view of M in FIG;

[0020] Figure 3 for Figure 1 A partial enlarged view of a pump assembly at position N in one embodiment;

[0021] Figure 4 for Figure 1 A partial enlarged view of position N of a pump assembly in another embodiment;

[0022] Figure 5 for Figure 1 A schematic diagram of a three-dimensional structure of the upper flange;

[0023] Figure 6 for Figure 1 Cross-sectional view of the upper flange in .

[0024] The reference numerals indicate:

[0025] 1. Upper flange; 11. Crankshaft assembly hole; 12. Flexible groove; 13. Oil storage ring groove; 14. Disc body; 15. Cylinder body; 161. First groove section; 162. Second groove section; 1621. Oil return hole; 17. Hollow hole; 2. Crankshaft; 21. Eccentric part; 22. Center oil blind hole; 221. Side oil hole; 100. Oil sump; 101. Oil guide plate; 102. Roller; 103. Cylinder; 104. Housing; 105. Lower flange. DETAILED DESCRIPTION

[0026] With reference to Figures 1 to 6 As shown, according to the embodiment of the present application, a pump body assembly is provided, comprising an upper flange 1, a crankshaft 2, the upper flange 1 is configured with a crankshaft assembly hole 11, the crankshaft 2 is rotatably assembled in the crankshaft assembly hole 11, the crankshaft 2 has an eccentric portion 21, a roller 102 is sleeved on the eccentric portion 21, and a cylinder 103 is further sleeved outside the roller 102, the upper flange 1 is sleeved on the top of the eccentric portion 21 of the crankshaft 2, and a lower flange 105 is sleeved on the bottom of the eccentric portion 21 of the crankshaft 2, so as to realize the clamping of the upper flange 1 and the lower flange 105 on the upper and lower end faces of the cylinder 103, the crankshaft 2 has a central oiling blind hole 22 extending in the axial direction thereof, one end of the upper flange 1 close to the eccentric portion 21 is a first end, and one end of the upper flange 1 away from the eccentric portion 21 is a second end, a circular ring-shaped flexible groove 12 is configured on the end face of the first end, an oil storage ring groove 13 is configured on the hole opening wall adjacent to the second end of the crankshaft assembly hole 11, an oil return groove is configured on the hole wall of the crankshaft assembly hole 11, a side oil hole 221 is configured at the hole bottom position of the central oiling blind hole 22, and the lubricating oil pumped in the central oiling blind hole 22 is at least partially returned to the oil pool 100 through the side oil hole 221, the oil storage ring groove 13 and the oil return groove in turn. For example, an oil guide sheet 101 can be arranged in the central oiling blind hole 22, the top end of the oil guide sheet 101 extends to the hole bottom position of the central oiling blind hole 22, and the side oil hole 221 can uniformly pump oil into the oil storage ring groove 13 within an angle range of 360° rotation of the crankshaft 2. In the technical solution, the oiling hole is a blind hole structure, thereby preventing excessive lubricating oil from being pumped to the top end position of the crankshaft to increase the compressor oil discharge rate under the action of the upper motor assembly, the central oiling blind hole 22 can pump the lubricating oil in the oil pool 100 to the bottom end position of the crankshaft 2, and then guide the lubricating oil to return to the lower oil pool 100 through the oil return groove to realize internal circulation of the lubricating oil, the lubricating oil in the oil return groove contacts the matched crankshaft section to realize sufficient lubrication of the contact matching position of the crankshaft 2 and the upper flange 1. Since there is no problem of short circuit of multiple oil paths intersecting and communicating, the circular ring-shaped flexible groove 12 is adopted in the technical solution, the circular ring-shaped flexible groove 12 surrounds the full circumference of the crankshaft 2, effectively reduces the excessive contact stress of the inner circle lower end of the upper flange 1 and the root position of the crankshaft 2, and improves the reliability of the pump body assembly.

[0027] In some embodiments, the upper flange 1 comprises a disc body 14 and a cylinder body 15 on the side of the disc body 14 away from the eccentric portion 21, the oil return groove comprises a first groove section 161 extending along the axial direction of the cylinder body 15 and a second groove section 162 extending along the radial direction of the disc body 14, a first end of the first groove section 161 is in communication with the oil ring groove 13, a second end of the first groove section 161 is in communication with a first end of the second groove section 162, and an opening of a second end of the second groove section 162 faces the side of the oil pool 100. Specifically, the second groove section 162 extends along the radial direction of the disc body 14 from inside to outside, so that the outlet of the second groove section 162 can face the oil pool 100 below the pump body assembly, thereby enabling the lubricating oil flowing out of the second groove section 162 to fall back into the oil pool 100 under the action of gravity. The second groove section 162 is different from the opening groove structure of the first groove section 161, and is entirely within the disc body 14. In a specific embodiment, as shown in Figure 5 the disc body 14 has a plurality of hollow holes 17 passing through the upper and lower end faces of the disc body 14, so that the lubricating oil in the upper space of the upper flange 1 (the space where the motor assembly is located) can fall back into the oil pool 100 through the hollow holes 17. At this time, the second groove section 162 is in communication with one of the hollow holes 17 to form the falling back of the lubricating oil, and the original structure of the upper flange 1 is utilized without the need for separately constructing an oil falling hole, thereby simplifying the processing process. The position where the first groove section 161 and the second groove section 162 are in communication has an oil return hole 1621 which is constructed on the hole wall of the crankshaft assembly hole 11.

[0028] The first groove section 161 can be a straight line groove extending along the axial direction of the cylinder body 15. In a preferred embodiment, the first groove section 161 is a spiral opening groove, and the spiral rotation direction of the spiral opening groove is opposite to the rotation direction of the crankshaft 2. The spiral angle and pitch of the spiral opening groove can be reasonably selected according to the actual application requirements. The opposite arrangement of the spiral rotation direction of the spiral opening groove and the rotation direction of the crankshaft 2 enables the spiral opening groove to have the effect of pumping lubricating oil from top to bottom, thereby ensuring that there is sufficient lubricating oil in the oil return groove and achieving sufficient lubrication at the contact fitting position of the crankshaft 2.

[0029] Referring to Figure 2 the second groove section 162 is in communication with the flexible groove 12, that is, the second groove section 162 passes through the flexible groove 12 along the radial direction of the disc body 14.

[0030] Continuing to refer to Figure 2As shown, in some embodiments, the distance between the second end of the first groove segment 161 and the first end of the upper flange 1 is a, the crankshaft 2 further comprises a fitting segment corresponding to the crankshaft fitting hole 11 and a necking segment between the fitting segment and the eccentric portion 21, the distance between the end of the necking segment away from the eccentric portion 21 and the first end of the upper flange 1 is b, a≤b, which can ensure that the first groove segment 161 of the upper flange 1 can pump lubricating oil to any position of the lower end of the contact segment of the crankshaft 2 and the upper flange 1. When a>b, the lower position of the crankshaft and the fitting portion of the upper flange will cause a part of the contact length (length value a-b) to be a position that the oil groove 161 cannot reach, thereby causing the reliability risk of insufficient lubrication of this part and causing wear; when a≤b, the oil groove 161 can fully pump oil to the crankshaft and the fitting portion of the upper flange.

[0031] In some embodiments, the axial minimum distance between the side oil hole 221 on the side away from the eccentric portion 21 and the free end face of the cylinder body 15 is c, the axial minimum distance between the side of the side oil hole 221 close to the eccentric portion 21 and the groove wall on the side away from the eccentric portion 21 of the oil storage ring groove 13 is d, and the axial width of the oil storage ring groove 13 is e, c>0, d≥0.5e, which can ensure that the oil can be fully pumped from the side oil hole 221 to the oil storage ring groove 13, and at the same time, the oil pumping resistance is not too large, the lubricating oil supply between the friction surface of the crankshaft 2 and the upper flange 1 above the oil storage ring groove 13 is fully lubricated, and the risk of wear caused by insufficient local oil supply is reduced.

[0032] In some embodiments, 0.01mm≤c≤0.5mm, which ensures that the crankshaft fitting segment above the oil storage ring groove 13 of the upper flange 1 can be fully lubricated as much as possible to avoid local wear caused by insufficient lubrication of the fitting segment.

[0033] According to the embodiments of the present application, a rolling rotor type compressor is also provided, which comprises the above-mentioned pump body assembly, in particular, a single-cylinder, double-cylinder or multi-cylinder rotor type compressor, which can also be a rotary cylinder compressor, etc.

[0034] According to the embodiments of the present application, an air conditioner is also provided, which comprises the above-mentioned rolling rotor type compressor.

[0035] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0036] The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pump body assembly comprising an upper flange (1) having a crank shaft fitting hole (11) formed therein, and a crank shaft (2) rotatably fitted in the crank shaft fitting hole (11), the crank shaft (2) having an eccentric portion (21), characterized in that, The crankshaft (2) has a central upper oil blind hole (22) extending along the axial direction thereof, the upper flange (1) has a first end near the eccentric part (21) and a second end away from the eccentric part (21), a circular annular flexible groove (12) is arranged on the end face of the first end, an oil storage ring groove (13) is arranged on the inner wall of the hole opening of the crankshaft assembly hole (11) adjacent to the second end, an oil return groove is arranged on the hole wall of the crankshaft assembly hole (11), and a side oil hole (221) is arranged at the hole bottom position of the central upper oil blind hole (22); lubricating oil pumped in the central upper oil blind hole (22) flows back to the oil pool (100) at least partially through the side oil hole (221), the oil storage ring groove (13) and the oil return groove in sequence; the upper flange (1) comprises a disc body (14) and a cylinder body (15) on the side of the disc body (14) away from the eccentric part (21), the oil return groove comprises a first groove section (161) extending along the axial direction of the cylinder body (15); the distance between the second end of the first groove section (161) and the first end of the upper flange (1) is a, and the crankshaft (2) further comprises an assembly section corresponding to the crankshaft assembly hole (11) and a necked section between the assembly section and the eccentric part (21), the distance between the first end of the upper flange (1) and the end of the necked section away from the eccentric part (21) is b, and a≤b.

2. The pump body assembly of claim 1, wherein, The oil return groove further comprises a second groove section (162) extending along the radial direction of the disc body (14), the first end of the first groove section (161) communicates with the oil storage ring groove (13), the second end of the first groove section (161) communicates with the first end of the second groove section (162), and the opening of the second end of the second groove section (162) faces the oil pool (100).

3. The pump body assembly of claim 2, wherein, The first groove section (161) is a spiral opening groove, and the spiral rotation direction of the spiral opening groove is opposite to the rotation direction of the crankshaft (2).

4. The pump body assembly of claim 2, wherein, The second groove section (162) penetrates the flexible groove (12).

5. The pump body assembly of claim 2, wherein, The axial minimum distance between the side of the side oil hole (221) away from the eccentric part (21) and the free end face of the cylinder body (15) is c, the axial minimum distance between the side of the side oil hole (221) near the eccentric part (21) and the groove wall of the oil storage ring groove (13) away from the eccentric part (21) is d, and the axial width of the oil storage ring groove (13) is e, c>0 and d≥0.5e.

6. The pump body assembly of claim 5, wherein, 0.01mm≤c≤0.5mm.

7. A rolling piston compressor, characterized by A pump body assembly comprising any one of claims 1 to 6.

8. An air conditioner characterized by comprising: A rolling piston compressor comprising the claim 7.

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