Pump body assembly, rolling piston compressor, air conditioner

Abstract

The application provides a pump body assembly, a rolling rotor compressor and an air conditioner, wherein the pump body assembly comprises an upper flange, a crankshaft, a crankshaft assembly hole is formed on the upper flange, the crankshaft is rotatably assembled in the crankshaft assembly hole, the crankshaft has an eccentric part, the crankshaft has a central oil supply hole extending along the axial direction of the crankshaft, one end of the upper flange close to the eccentric part is a first end, one end of the upper flange away from the eccentric part is a second end, a falling oil groove with an opening facing one side of a bottom oil pool is formed on the end face of the first end, an oil return channel is further formed on the upper flange, and the lubricating oil pumped in the central oil supply hole can be transported to the falling oil groove through the oil return channel and then fall back to the bottom oil pool from the falling oil groove. The lubricating oil pumped in the oil return channel will not be scattered upward to the lower cavity space of the upper motor assembly under the impact of the lubricating oil and the groove wall of the falling oil groove, thereby effectively reducing the problem of high oil discharge rate caused by the scattering from the cavity space in the prior art.

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 each friction pair 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 a pump oil device is assembled in the central oil hole of the crankshaft. The inner circular surfaces of the upper flange and the lower flange are respectively provided with oil grooves. A certain amount of lubricating oil is installed in the lower part of the shell. When the compressor is running, 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 portions of the inner circular surfaces 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 surfaces of the main and auxiliary bearings (friction pairs of the long and short shafts of the crankshaft) through the oil grooves in the upper and lower flanges, respectively, thereby realizing the oil passage lubrication of the main and auxiliary bearings.

[0004] When the compressor is operated at a high frequency, a large amount of heat energy is generated by the friction of the moving parts. If the pump oil 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, the motor efficiency is reduced, and finally the performance of the compressor is reduced. 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 then is 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 compressor with it (Patent Application No. 2022211069000), by opening a crescent radial groove oil groove at the inner hole wall surface below the upper end face of the upper flange, setting a lower oil groove (also can be a straight groove) with opposite rotation to the upper spiral oil groove on the inner circular surface of the flange, setting an oil return hole in the flange plate, and the oil groove is communicated with the upper spiral oil groove and the lower oil groove respectively, the oil return hole is communicated with the lower oil groove and the upper flange hollow cavity (waist-shaped hole) respectively, and then communicated 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 rotating crankshaft 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, since the lubricating oil pumped out by the oil outlet horizontal hole is directly pumped out radially, it is easy to cause the lubricating oil to splash the hollow cavity wall and cause part of the lubricating oil to splash into the lower cavity of the motor with the exhaust flow, resulting in poor oil discharge rate improvement effect. SUMMARY

[0007] Therefore, the present application provides a kind of pump body assembly, rolling rotor type compressor, air conditioner, which can solve the technical problems that part of the lubricating oil splashes into the lower cavity of the motor with the exhaust flow due to the lubricating oil pumped out by the oil outlet horizontal hole of the upper flange of the pump body assembly in the prior art, resulting in high oil discharge rate.

[0008] To solve the above problems, the present application provides a kind of pump body assembly, comprising an upper flange and a crankshaft, the upper flange is provided with a crankshaft assembly hole, the crankshaft is rotatably assembled in the crankshaft assembly hole, the crankshaft has an eccentric part, the crankshaft has a central oil hole extending along its axial direction, one end of the upper flange close to the eccentric part is the first end, and the other end away from the eccentric part is the second end, an oil falling groove with an opening facing the bottom oil pool side is formed on the end face of the first end, and an oil return channel is further formed on the upper flange, the lubricating oil pumped up in the central oil hole can be transported to the oil falling groove through the oil return channel, and then falls back into the bottom oil pool from the oil falling groove.

[0009] In some embodiments, the oil falling groove is a blind hole.

[0010] In some embodiments, the pump body assembly further comprises a housing, the upper flange comprises a disc body, the housing is sleeved on the outer side edge of the disc body, and a plurality of hollow holes penetrating through the two end faces of the disc body are formed on the disc body.

[0011] In some embodiments, the upper flange further comprises a cylinder body on the side of the disc body away from the eccentric part, the oil return channel comprises an upper oil groove and a lower oil groove formed on the inner hole wall of the cylinder body and an oil return pipe formed in the disc body, the upper oil groove and the lower oil groove extend along the axial direction of the crankshaft, the top end of the central upper oil hole is communicated with the upper oil groove, the top end of the upper oil groove is communicated with the top end of the lower oil groove, the bottom end of the lower oil groove is communicated with the radially inner end of the oil return pipe, and the radially outer end of the oil return pipe is communicated with the oil falling groove.

[0012] In some embodiments, the oil return pipe horizontally extends along the radial direction of the disc body, or the oil return pipe obliquely extends along the radial direction of the disc body, and the vertical height of the oil return pipe gradually decreases from inside to outside along the radial direction of the disc body.

[0013] In some embodiments, the crankshaft further has an upper flange fitting section matched with the crankshaft fitting hole, a necked section is arranged between the upper flange fitting section and the eccentric part, a side oil hole is formed on the necked section, the side oil hole extends along the radial direction of the crankshaft, one end of the side oil hole is communicated with the central upper oil hole, and the other end of the side oil hole is communicated with the upper oil groove; the upper oil groove is a spiral opening groove, and the spiral rotation direction of the spiral opening groove is the same as the rotation direction of the crankshaft; and the lower oil groove is a spiral opening groove, and the spiral rotation direction of the spiral opening groove is opposite to the rotation direction of the crankshaft.

[0014] In some embodiments, the pump body assembly further comprises a cylinder, when the oil falling groove is a blind hole, the blind hole is located in the region between the cylinder and the housing in any radial plane of the pump body assembly; and / or an included angle θ is formed between the hole center line of the blind hole and the axis of the crankshaft, x≤θ≤y.

[0015] In some embodiments, a circular ring-shaped flexible groove is further formed on the end face of the first end, and the flexible groove surrounds the crankshaft.

[0016] The application further provides a rolling rotor type compressor comprising the above pump body assembly.

[0017] The application further provides an air conditioner comprising the above rolling rotor type compressor.

[0018] The pump body assembly, the rolling rotor compressor and the air conditioner provided by the application have the following beneficial effects: the opening of the oil falling groove is oriented to one side of the bottom oil pool, the lubricating oil pumped in the oil return channel falls into the bottom oil pool from the opening, and will not be scattered upward to the lower cavity space of the upper motor assembly due to the impact of the lubricating oil on the wall of the oil falling groove, thereby effectively reducing the problem of high oil discharge rate caused by the scattering in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic view of the internal structure of the pump body assembly of an embodiment of the application (partially), in which the arrows show the flow direction of the lubricating oil;

[0020] Figure 2 FIG. 2 is a partial enlarged view of A in FIG. 1 in an embodiment; Figure 1

[0021] Figure 3 FIG. 3 is a schematic view of the upper flange of FIG. 1 in a perspective structure; Figure 2

[0022] Figure 4 FIG. 4 is a partial enlarged view of A in FIG. 1 in another embodiment; Figure 1

[0023] Figure 5 FIG. 5 is a schematic view of the internal structure of the pump body assembly of another embodiment of the application (partially), in which the arrows show the flow direction of the lubricating oil;

[0024] Figure 6 FIG. 6 is a partial enlarged view of B in FIG. 5; Figure 5

[0025] Figure 7 FIG. 7 is a sectional view of the upper flange in FIG. 5. Figure 5 The reference signs are as follows:

[0026] 1, upper flange; 11, crankshaft assembly hole; 12, oil falling groove; 13, oil storage ring groove; 14, disc body; 15, cylinder body; 16, flexible groove; 17, hollow hole; 2, crankshaft; 21, eccentric part; 22, central oil supply hole; 221, side oil hole; 23, upper flange matching section; 31, upper oil groove; 32, lower oil groove; 33, oil return pipe; 100, bottom oil pool; 101, oil guide piece; 102, roller; 103, cylinder; 104, shell; 105, lower flange.

[0027] DETAILED DESCRIPTION

[0028] For reference Figures 1 to 7 ​​​​​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 oil supply hole 22 extending in the axial direction thereof, and an oil guide sheet 101 or other oil pumping structure is arranged in the central oil supply hole 22, one end of the upper flange 1 close to the eccentric portion 21 is a first end, and the other end away from the eccentric portion 21 is a second end, an oil falling groove 12 with an opening facing one side of a bottom oil pool 100 is configured on the end face of the first end, and a return oil passage is further configured on the upper flange 1, the lubricating oil pumped in the central oil supply hole 22 can be transported to the oil falling groove 12 through the return oil passage and fall back to the bottom oil pool 100 from the oil falling groove 12. In the technical solution, the opening of the oil falling groove 12 faces one side of the bottom oil pool 100, the lubricating oil pumped in the return oil passage falls back to the bottom oil pool 100 from the opening, and will not be scattered upward to the lower cavity space of the upper motor assembly due to the impact of the lubricating oil on the groove wall of the oil falling groove 12, thereby effectively reducing the problem of high oil discharge rate caused by the scattering in the prior art.

[0029] It should be noted that the groove bottom wall of the oil falling groove 12 is a solid structure, which can be a solid structure part of the upper flange 1, or can be formed by plugging the top opening of a through hole structure configured on the upper flange 1. The shape of the oil falling groove 12 can be various, such as Figure 7 As shown, it can be a long waist shape, and in a specific embodiment, the oil falling groove 12 is a blind hole, specifically a circular blind hole, which can simplify the processing technology.

[0030] The upper flange 1 comprises a disc body 14, a shell 104 is sleeved on the outer side edge of the disc body 14, and the shell 104 is sleeved on the outer side edge of the disc body 14 in an interference fit, that is, the outer side edge of the disc body 14 is in close contact with the inner wall of the shell 104 without gap, thereby ensuring the reliable stability of the positional relationship between the disc body 14 and the shell 104, and a plurality of hollow holes 17 are configured on the disc body 14 and pass 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.

[0031] The upper flange 1 further comprises a cylinder 15 on the side of the disc body 14 away from the eccentric part 21, which forms a through fit with the crankshaft 2. The oil return channel comprises an upper oil groove 31 and a lower oil groove 32 formed on the inner hole wall of the cylinder 15, and an oil return pipe 33 formed in the disc body 14. The upper oil groove 31 and the lower oil groove 32 extend along the axial direction of the crankshaft 2. The top end of the central oil hole 22 is in communication with the upper oil groove 31. The top end of the upper oil groove 31 is in communication with the top end of the lower oil groove 32. The bottom end of the lower oil groove 32 is in communication with the radially inner end of the oil return pipe 33. The radially outer end of the oil return pipe 33 is in communication with the oil return groove 12. It can be understood that the upper oil groove 31 and the lower oil groove 32 in the technical solution are both open grooves with openings facing the side of the crankshaft 2, so as to be able to form sufficient lubrication for the rotating crankshaft 2. The oil return pipe 33 is a pipe structure formed in the disc body 14, so as to form an internal circulation of oil return, thereby preventing excessive lubricating oil from being pumped to the top end position of the crankshaft to increase the oil discharge rate of the compressor under the action of the upper motor assembly. The upper oil groove 31 is a spiral open groove, and the spiral rotation direction of the spiral open groove is the same as the rotation direction of the crankshaft 2. The lower oil groove 32 is a spiral open groove, and the spiral rotation direction of the spiral open groove is opposite to the rotation direction of the crankshaft 2, so as to realize the upward or downward pumping of the lubricating oil during the rotation of the crankshaft 2, thereby ensuring that there is sufficient lubricating oil in the oil return groove and realizing sufficient lubrication at the contact fit position of the crankshaft 2. Referring to Figure 1 As shown in the figure, the top end of the upper oil groove 31 is in communication with the top end of the lower oil groove 32 through the oil storage ring groove 13.

[0032] Referring to Figure 2 Or Figure 4 As shown in the figure, in some embodiments, the oil return pipe 33 extends horizontally along the radial direction of the disc body 14, which can reduce the processing difficulty of the oil return pipe 33. For example, the oil return pipe 33 can be obtained by drilling from the outer circumferential wall of the disc body 14 inwards along the radial direction of the disc body 14; or, referring to Figure 6 As shown in the figure, the oil return pipe 33 extends obliquely along the radial direction of the disc body 14, and the vertical height of the oil return pipe 33 becomes lower and lower from inside to outside along the radial direction of the disc body 14. The obliquely extending oil return pipe 33 can avoid the flexible groove 16, and prevent the oil return hole from being in communication with the flexible groove 16 due to the straight hole structure of the oil return pipe 33. Since the flexible groove 16 is in communication with the crankshaft side oil hole 1302, if the oil return hole is in communication with the flexible groove, the lubricating oil pumped out of the crankshaft side oil hole will directly enter the oil pool through the flexible groove 16 and the oil return hole, thereby greatly reducing the oil pumping amount of the oil way and causing the problem of oil shortage wear.

[0033] In some embodiments, the crankshaft 2 further has an upper flange matching section 23 matched with the crankshaft assembly hole 11, and a necked section between the eccentric part 21 and the upper flange matching section 23, and a side oil hole 221 is formed on the necked section and extends along the radial direction of the crankshaft 2, one end of the side oil hole 221 is communicated with the central upper oil hole 22, and the other end of the side oil hole 221 can be communicated with the upper oil groove 31, and the side oil hole 221 is arranged at the position with smaller diameter, so that part of the lubricating oil in the central upper oil hole 22 can flow along the circumferential direction at this position, thereby fully lubricating the contact part between the upper flange 1 and the crankshaft 2.

[0034] Referring to Figure 4 As shown in the drawings, in some embodiments, when the oil falling groove 12 is a blind hole, the blind hole is located in the area between the cylinder 103 and the shell 104 in any radial plane of the pump body assembly.

[0035] In some embodiments, a circular ring-shaped flexible groove 16 is further formed on the end face of the first end, and the flexible groove 16 surrounds the crankshaft 2, and the circular ring-shaped flexible groove 16 surrounds the full circumference of the crankshaft 2, which effectively reduces the part wear caused by excessive contact stress between the inner lower end of the upper flange 1 and the root position of the crankshaft 2, and improves the reliability of the pump body assembly.

[0036] According to the embodiments of the present application, a rolling rotor type compressor is further provided, which comprises the above pump body assembly.

[0037] According to the embodiments of the present application, an air conditioner is further provided, which comprises the above rolling rotor type compressor, in particular, a single-cylinder, double-cylinder or multi-cylinder rotor type compressor, or a rotary cylinder compressor, etc.

[0038] It is easy for those skilled in the art to understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0039] The above is only the preferred embodiment of the present application, and should not be used to limit the present application, 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 is only the preferred embodiment of the present application, and should not be used to limit the present application, 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 hole (22) extending along the axial direction thereof, the upper flange (1) has a first end near the eccentric portion (21) and a second end away from the eccentric portion (21), an oil falling groove (12) is formed on the end face of the first end and opens towards the bottom oil pool (100) side, and an oil return channel is further formed on the upper flange (1), lubricating oil pumped up in the central upper oil hole (22) can be transported to the oil falling groove (12) through the oil return channel and then falls back to the bottom oil pool (100) from the oil falling groove (12); the pump body assembly further comprises a shell (104), the upper flange (1) comprises a disc body (14), the shell (104) is sleeved on the outer side edge of the disc body (14), and a plurality of hollow holes (17) penetrating through the two end faces of the disc body (14) are formed on the disc body (14); the upper flange (1) further comprises a cylinder body (15) on the side of the disc body (14) away from the eccentric portion (21), the oil return channel comprises an upper oil groove (31) and a lower oil groove (32) formed on the inner hole wall of the cylinder body (15) and an oil return pipe (33) formed in the disc body (14), the upper oil groove (31) and the lower oil groove (32) extend along the axial direction of the crankshaft (2), the top end of the central upper oil hole (22) is communicated with the upper oil groove (31), the top end of the upper oil groove (31) is communicated with the top end of the lower oil groove (32), the bottom end of the lower oil groove (32) is communicated with the radially inner end of the oil return pipe (33), and the radially outer end of the oil return pipe (33) is communicated with the oil falling groove (12); the oil return pipe (33) extends radially and obliquely along the disc body (14), and the vertical height of the oil return pipe (33) is lower and lower from inside to outside along the radial direction of the disc body (14).

2. The pump body assembly of claim 1, wherein, The oil falling groove (12) is a blind hole.

3. The pump body assembly of claim 1, wherein, The crankshaft (2) further has an upper flange matching section (23) matched with the crankshaft assembly hole (11), a necked section is arranged between the upper flange matching section (23) and the eccentric portion (21), a side oil hole (221) is formed on the necked section, the side oil hole (221) extends along the radial direction of the crankshaft (2), one end of the side oil hole (221) is communicated with the central upper oil hole (22), and the other end of the side oil hole (221) can be communicated with the upper oil groove (31); and / or, the upper oil groove (31) is a spiral opening groove, and the spiral rotation direction of the spiral opening groove is the same as the rotation direction of the crankshaft (2); the lower oil groove (32) 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 1, wherein, The pump body assembly further comprises a cylinder (103), when the oil falling groove (12) is a blind hole, the blind hole is located in the region between the cylinder (103) and the shell (104) in any radial plane of the pump body assembly.

5. The pump body assembly of claim 1, wherein, A circular ring-shaped flexible groove (16) is further configured on the end face of the first end, and the flexible groove (16) surrounds the crankshaft (2).

6. A rolling piston compressor, characterized by The pump body assembly of any one of claims 1 to 5.

7. An air conditioner characterized by comprising: The rolling piston compressor of claim 6.

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