Oil supply structure of rotor type compressor

Abstract

The invention provides an oil supply structure of a rotor type compressor. The oil supply structure comprises a first oil supply groove, a second oil supply groove, a third oil supply groove and a fourth oil supply groove, the first oil supply groove is formed in one of the lower cylinder cover and the short shaft, and the second oil supply groove is formed in the other one of the lower cylinder cover and the short shaft; one end of one of the first oil supply grooves is communicated with the inner wall side of the piston; in the rotating process of the short shaft, the second oil supply groove is intermittently communicated with the first oil supply groove adjacent to the second oil supply groove, and the second oil supply groove or the other first oil supply groove in the first oil supply groove is communicated with the first low-pressure oil pool; the third oil supply groove is formed in one of the upper cylinder cover and the long shaft, and the fourth oil supply groove is formed in the other one of the upper cylinder cover and the long shaft; and in the rotating process of the long shaft, the fourth oil supply groove is intermittently communicated with the third oil supply groove adjacent to the fourth oil supply groove. According to the scheme, lubricating oil in the high-pressure oil pool is intermittently supplied to related friction positions of the short shaft and the long shaft, and therefore long-time continuous oil supply is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to an oil supply structure of a rotor type compressor. Background Art

[0002] There are three types of rotary compressors: the first is a high back-pressure compressor, in which the interior of the shell is a high-pressure chamber, and the motor, pump body and oil pool are arranged in the high pressure; the second is a low back-pressure compressor, in which the interior of the shell is a low-pressure chamber, and the motor, pump body and oil pool are arranged in the low pressure; the third is a motor low-pressure and pump body high-pressure, and the interior of the compressor includes two sealed chambers of high and low pressure. In most cases, the two sealed chambers use the upper cylinder head as the dividing interface, the motor side sealed chamber is the low-pressure chamber, and the pump body side sealed chamber is the high-pressure chamber, and the pump body and the high-pressure oil pool are arranged in the pump body side sealed chamber.

[0003] For the first and second types of compressors, an oil supply hole is usually set on the crankshaft. The oil supply hole includes a vertical section and a horizontal section. The vertical section is set along the axis of the crankshaft, and the horizontal section is vertically connected to the vertical section. The lubricating oil is sucked from one end of the vertical section. When the crankshaft rotates, the lubricating oil rises to the other end of the vertical section due to the action of centrifugal force, and then is discharged from one end of the horizontal section, thereby lubricating the friction positions related to the long shaft.

[0004] For the third type of compressor, if the third type of compressor also adopts the oil supply structure of the first and second types of compressors, since the motor side sealing chamber in the third type of compressor is a low-pressure chamber and the pump body side sealing chamber is a high-pressure chamber, the lubricating oil will be quickly pumped from the oil pool into the motor side sealing chamber under the action of the air pressure difference, and the pump body side oil pool will be short of oil. The oil supply structure cannot supply oil continuously for a long time, causing reliability problems of the compressor. Summary of the invention

[0005] The invention provides an oil supply structure for a rotary compressor to solve the technical problem that the existing oil supply structure cannot supply oil continuously for a long time.

[0006] In order to solve the above technical problems, the present invention provides an oil supply structure of a rotary compressor, the rotary compressor comprising a lower cylinder head, a cylinder, an upper cylinder head, a crankshaft, a piston, a high-pressure oil pool, a first low-pressure oil pool and a second low-pressure oil pool; the high-pressure oil pool is connected to the inner wall side of the piston through a through hole on the lower cylinder head and / or the upper cylinder head; the lower cylinder head is arranged between the cylinder and the first low-pressure oil pool; the upper cylinder head is arranged between the cylinder and the second low-pressure oil pool; the crankshaft comprises a short shaft and a long shaft;

[0007] The oil supply structure comprises a first oil supply groove, a second oil supply groove, a third oil supply groove and a fourth oil supply groove;

[0008] The first oil supply groove is arranged on one of the lower cylinder head and the short shaft, and the second oil supply groove is arranged on the other of the lower cylinder head and the short shaft; the number of the first oil supply grooves is more than one, and one end of one of the first oil supply grooves is connected to the inner wall side of the piston; during the rotation of the short shaft, the second oil supply groove is intermittently connected to the first oil supply groove adjacent thereto, and the second oil supply groove or the other of the first oil supply grooves is connected to the first low-pressure oil pool;

[0009] The third oil supply groove is arranged on one of the upper cylinder head and the long shaft, and the fourth oil supply groove is arranged on the other of the upper cylinder head and the long shaft; the number of the third oil supply grooves is more than one, and one end of one of the third oil supply grooves is connected to the inner wall side of the piston; during the rotation of the long shaft, the fourth oil supply groove and the third oil supply groove adjacent thereto are intermittently connected, and the fourth oil supply groove or the other of the third oil supply grooves is connected to the second low-pressure oil pool.

[0010] Optionally, the first oil supply groove is arranged on the lower cylinder head along the extension direction of the short shaft and is located on the surface where the lower cylinder head and the short shaft cooperate; the second oil supply groove is arranged on the outer surface of the short shaft along the circumference of the short shaft.

[0011] Optionally, the crankshaft includes more than one eccentric portion, and the opening direction of the second oil supply groove is the same as the protruding direction of the eccentric portion adjacent thereto.

[0012] Optionally, the crankshaft includes the long shaft, the upper eccentric part, the lower eccentric part and the short shaft connected in sequence, and the second oil supply groove is coaxial with the upper eccentric part.

[0013] Optionally, the circumferential length of the opening of the second oil supply groove along the short axis is L1, the diameter of the short axis is Φ1, 0.5Φ1<L1<0.8Φ1; the height of the lower cylinder head is H1, and the axial height of the second oil supply groove along the lower cylinder head is h1, 1 / 10H1≤h1≤1 / 3H1.

[0014] Optionally, the third oil supply groove is arranged on the upper cylinder cover along the extension direction of the long axis and is located on the surface where the upper cylinder cover matches the long axis; the fourth oil supply groove is arranged on the outer surface of the long axis along the circumference of the long axis.

[0015] Optionally, the crankshaft includes more than one eccentric portion, and the opening direction of the fourth oil supply groove is the same as the protruding direction of the eccentric portion adjacent thereto.

[0016] Optionally, the crankshaft includes the long shaft, the upper eccentric part, the lower eccentric part and the short shaft connected in sequence, and the fourth oil supply groove is coaxial with the lower eccentric part.

[0017] Optionally, the circumferential length of the opening of the fourth oil supply groove along the major axis is L2, the diameter of the major axis is Φ2, 0.5Φ2<L2<0.8Φ2; the height of the upper cylinder head is H2, and the axial height of the fourth oil supply groove along the upper cylinder head is h2, 1 / 10H2≤h2≤1 / 3H2.

[0018] Optionally, the second oil supply groove and the fourth oil supply groove have the same size.

[0019] The present invention provides an oil supply structure for a rotary compressor, which intermittently supplies lubricating oil in a high-pressure oil pool to the friction positions related to the short shaft and the long shaft through intermittent communication between the first oil supply groove and the second oil supply groove, and intermittent communication between the third oil supply groove and the fourth oil supply groove, thereby achieving long-term continuous oil supply, thereby improving the service life and performance of the compressor. At the same time, by arranging a second oil groove and a fourth oil groove on the crankshaft with the opening direction being in the same direction as the protruding direction of the adjacent eccentric part, the dynamic balance of the crankshaft is improved, the vibration generated when the crankshaft rotates at high speed is reduced, and the reliability of the compressor is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an oil supply structure of a rotary compressor provided in one embodiment of the present invention.

[0021] Figure 2 It is a structural schematic diagram of an oil supply structure of a rotary compressor provided in one embodiment of the present invention.

[0022] Figure 3 It is a structural schematic diagram of an upper cylinder cover provided by one embodiment of the present invention.

[0023] Figure 4 It is a schematic structural diagram of a crankshaft provided in one embodiment of the present invention.

[0024] Figure 5 yes Figure 4 VV cross-sectional view.

[0025] Figure 6 It is a schematic structural diagram of a crankshaft provided in one embodiment of the present invention.

[0026] Figure 7 yes Figure 6 UU cross-sectional view.

[0027] Figure 8 It is a schematic structural diagram of another crankshaft provided by one embodiment of the present invention.

[0028] Fig. 9 It is a partial structural schematic diagram of an oil supply structure of a rotary compressor provided in one embodiment of the present invention.

[0029] Fig.10 It is a schematic structural diagram of another crankshaft provided by one embodiment of the present invention.

[0030] [Description of reference numerals is as follows]:

[0031] Lower cylinder head-1, cylinder-2, upper cylinder head-3, crankshaft-4, piston-5, high-pressure oil pool-6, first low-pressure oil pool-7, second low-pressure oil pool-8;

[0032] The first oil supply tank-11, the second oil supply tank-12, the third oil supply tank-13, the fourth oil supply tank-14, and the connecting line-15;

[0033] Short axis-41, long axis-42, eccentric portion-43, center line of long and short axis-44;

[0034] The center of mass corresponding to the second oil supply tank is -121, and the center of mass corresponding to the fourth oil supply tank is -141;

[0035] The upper eccentric part 431, the lower eccentric part 432, and the center of mass corresponding to the eccentric part 433. DETAILED DESCRIPTION

[0036] In order to make the purpose, advantages and features of the present invention clearer, the oil supply structure of a rotary compressor proposed by the present invention is further described in detail below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0037] In the description of the present invention, the terms "first", "second", etc. are added for the convenience of description and reference, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined by the terms "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0038] like Figure 1-Figure 7As shown, this embodiment provides an oil supply structure of a rotary compressor, the rotary compressor comprising a lower cylinder head 1, a cylinder 2, an upper cylinder head 3, a crankshaft 4, a piston 5, a high-pressure oil pool 6, a first low-pressure oil pool 7 and a second low-pressure oil pool 8; the high-pressure oil pool 6 is connected to the inner wall side of the piston 5 through a through hole on the lower cylinder head 1 and / or the upper cylinder head 3; the lower cylinder head 1 is arranged between the cylinder 2 and the first low-pressure oil pool 7; the upper cylinder head 3 is arranged between the cylinder 2 and the second low-pressure oil pool 8; the crankshaft 4 comprises a short shaft 41 and a long shaft 42; the oil supply structure comprises a first oil supply groove 11, a second oil supply groove 12, a third oil supply groove 13 and a fourth oil supply groove 14; the first oil supply groove 11 is arranged on one of the lower cylinder head 1 and the short shaft 41, and the second oil supply groove 12 is arranged on the other of the lower cylinder head 1 and the short shaft 41; the number of the first oil supply grooves 11 is more than one, and one of the first oil supply grooves 11 One end of the first oil supply groove 11 is connected to the inner wall side of the piston 5; during the rotation of the short shaft 41, the second oil supply groove 12 is intermittently connected to the first oil supply groove 11 adjacent thereto, and the second oil supply groove 12 or the other of the first oil supply grooves 11 is connected to the first low-pressure oil pool 7; the third oil supply groove 13 is arranged on one of the upper cylinder head 3 and the long shaft 42, and the fourth oil supply groove 14 is arranged on the other of the upper cylinder head 3 and the long shaft 42; the number of the third oil supply grooves 13 is more than one, and one end of one of the third oil supply grooves 13 is connected to the inner wall side of the piston 5; during the rotation of the long shaft 42, the fourth oil supply groove 14 is intermittently connected to the third oil supply groove 13 adjacent thereto, and the fourth oil supply groove 14 or the other of the third oil supply grooves 13 is connected to the second low-pressure oil pool 8.

[0039] The inner wall side of the piston 5 refers to the hollow position of the shaft of the piston 5. There is a gap between the inner wall of the piston 5 and the eccentric part 43 of the crankshaft 4. The high-pressure oil pool 6 is connected to the inner wall side of the piston 5 through the through hole on the lower cylinder head 1 and / or the upper cylinder head 3, so that the lubricating oil in the high-pressure oil pool 6 can enter the gap. The number of the first oil supply groove 11, the second oil supply groove 12, the third oil supply groove 13 and the fourth oil supply groove 14 can be one or more than two. Figure 1 and Figure 2 For example, the number of the first oil supply groove 11, the second oil supply groove 12, the third oil supply groove 13 and the fourth oil supply groove 14 are two, one, two and one respectively; the lubricating oil in the high-pressure oil pool 6 forms two paths under the action of air pressure, the first path is the high-pressure oil pool 6 (such as Figure 1 As shown), through holes on the lower cylinder head 1 and / or the upper cylinder head 3 (as shown Figure 1 As shown), the inner wall side of the piston 5 (as shown Figure 1 As shown), the first oil supply groove 11 above (as Figure 1 As shown), the second oil supply groove 12 (as Figure 1 As shown), the first oil supply groove 11 below (as shown Figure 2 As shown), the first low-pressure oil pool 7 (as Figure 2 The second path is the high pressure oil pool 6 (as shown); Figure 1 As shown), through holes on the lower cylinder head 1 and / or the upper cylinder head 3 (as shown Figure 1 As shown), the inner wall side of the piston 5 (as shown Figure 1 As shown), the third oil supply groove 13 below (as shown Figure 1 As shown), the fourth oil supply groove 14 (as shown Figure 1 As shown), the third oil supply groove 13 above (as Figure 2 As shown), the second low-pressure oil pool 8 (as Figure 2 As shown), the lubricating oil in the high-pressure oil pool 6 can intermittently enter the low-pressure side from the high-pressure side, thereby achieving long-term continuous oil supply. The oil supply structure provided in this embodiment is mainly used in a rotary compressor including a high-pressure chamber and a low-pressure chamber, and the rotary compressor can be a vertical, horizontal, single-cylinder or multi-cylinder compressor.

[0040] The present embodiment provides an oil supply structure for a rotary compressor, which intermittently supplies lubricating oil in a high-pressure oil pool 6 to friction positions related to a short shaft 41 and a long shaft 42 through intermittent communication between a first oil supply groove 11 and a second oil supply groove 12, and intermittent communication between a third oil supply groove 13 and a fourth oil supply groove 14, thereby achieving long-term continuous oil supply and thereby improving the service life and performance of the compressor.

[0041] Optional, such as Figure 1 and Figure 4 As shown, the first oil supply groove 11 is arranged on the lower cylinder head 1 along the extension direction of the short shaft 41 and is located on the surface of the lower cylinder head 1 that matches the short shaft 41; the second oil supply groove 12 is arranged on the outer surface of the short shaft 41 along the circumferential direction of the short shaft 41. This facilitates the processing of the first oil supply groove 11 and the second oil supply groove 12.

[0042] Optional, such as Figure 4 and Figure 8 As shown, the crankshaft 4 includes more than one eccentric portion 43, and the opening direction of the second oil supply groove 12 is the same as the protruding direction of the adjacent eccentric portion 43. When the opening direction of the second oil supply groove 12 is the same as the protruding direction of the adjacent eccentric portion 43, the line connecting the center of the second oil supply groove 12 and the center of the long and short shafts is collinear with the line connecting the eccentric portion 43 and the center of the long and short shafts (refer to Figure 5As shown by the connecting line 15 in the figure), the center of mass 121 corresponding to the second oil supply groove 12 and the center of mass 433 corresponding to the eccentric portion 43 are distributed on both sides of the major and minor axis center line 44, thereby making the center of mass of the crankshaft 4 close to the center of the crankshaft 4, improving the dynamic balance, and reducing the vibration generated when the crankshaft 4 rotates at high speed.

[0043] Optional, such as Figure 8 As shown, the crankshaft 4 includes the long shaft 42, the upper eccentric part 431, the lower eccentric part 432 and the short shaft 41 connected in sequence, and the second oil supply groove 12 is coaxial with the upper eccentric part 431. In this way, the second oil supply groove 12 and the upper eccentric part 431 can be processed at the same time, clamped at one time, and convenient for processing.

[0044] Optional, reference Figure 1 , Figure 7 and Fig. 9 As shown, the length of the opening of the second oil supply groove 12 along the circumferential direction of the short axis 41 is L1 (refer to Figure 7 L2), the diameter of the short axis 41 is Φ1 (reference Figure 7 Φ2), 0.5Φ1<L1<0.8Φ1; the height of the lower cylinder head 1 is H1 (reference Fig. 9 H2), the height of the second oil supply groove 12 along the axial direction of the lower cylinder head 1 is h1 (reference Fig. 9 h2), 1 / 10H1≤h1≤1 / 3H1. In this way, the oil storage capacity of the second oil supply groove 12 can be large, and the strength of the short shaft 41 can be maintained. The second oil supply groove 12 can be located within the middle 1 / 3 range of the total height H1 of the lower cylinder head 1, that is, the upper spacing a1≥1 / 3H1, the lower spacing b1≥1 / 3H1, a1 reference Fig. 9 A2, B1 reference Fig. 9 b2.

[0045] Optional, such as Figure 1 and Figure 4 As shown, the third oil supply groove 13 is arranged on the upper cylinder head 3 along the extending direction of the long axis 42, and is located on the surface of the upper cylinder head 3 that matches the long axis 42; the fourth oil supply groove 14 is arranged on the outer surface of the long axis 42 along the circumferential direction of the long axis 42. This facilitates the processing of the third oil supply groove 13 and the fourth oil supply groove 14.

[0046] Optional, such as Figure 4 and Figure 8 As shown, the crankshaft 4 includes more than one eccentric portion 43, and the opening direction of the fourth oil supply groove 14 is the same as the protruding direction of the adjacent eccentric portion 43. When the opening direction of the fourth oil supply groove 14 is the same as the protruding direction of the adjacent eccentric portion 43, the line connecting the center of the fourth oil supply groove 14 and the center of the long and short shafts is collinear with the line connecting the eccentric portion 43 and the center of the long and short shafts (such as Figure 5 As shown by the connecting line 15 in the figure), the center of mass 141 corresponding to the fourth oil supply groove 14 and the center of mass 433 corresponding to the eccentric portion 43 are distributed on both sides of the major and minor axis center line 44, thereby making the center of mass of the crankshaft 4 close to the center of the crankshaft 4, improving the dynamic balance, and reducing the vibration generated when the crankshaft 4 rotates at high speed.

[0047] Optional, such as Figure 8 As shown, the crankshaft 4 includes the long shaft 42, the upper eccentric part 431, the lower eccentric part 432 and the short shaft 41 connected in sequence, and the fourth oil supply groove 14 is coaxial with the lower eccentric part 432. In this way, the fourth oil supply groove 14 and the lower eccentric part 432 can be processed at the same time, clamped at one time, and convenient for processing.

[0048] Optional, such as Figure 1 , Figure 7 and Fig. 9 As shown, the length of the opening of the fourth oil supply groove 14 along the circumferential direction of the major axis 42 is L2, the diameter of the major axis 42 is Φ2, 0.5Φ2<L2<0.8Φ2; the height of the upper cylinder head 3 is H2, the height of the fourth oil supply groove 14 along the axial direction of the upper cylinder head 3 is h2, 1 / 10H2≤h2≤1 / 3H2. In this way, the oil storage capacity of the fourth oil supply groove 14 can be large, and the strength of the major axis 42 can be maintained. The fourth oil supply groove 14 can be located within the middle 1 / 3 range of the total height H2 of the upper cylinder head 3, that is, the upper spacing a2≥1 / 3H2, and the lower spacing b2≥1 / 3H2.

[0049] Optional, such as Figure 1 and Figure 4 As shown, the second oil supply groove 12 and the fourth oil supply groove 14 have the same size, which makes it easier to process the second oil supply groove 12 and the fourth oil supply groove 14.

[0050] Optional, such as Fig.10 As shown, there are multiple second oil supply grooves 12. Multiple second oil supply grooves 12 can be arranged in parallel. The oil supply amount can be changed by changing the number and volume of the second oil supply grooves 12.

[0051] Optional, such as Fig.10 As shown, there are multiple fourth oil supply grooves 14. Multiple fourth oil supply grooves 14 can be arranged in parallel. The amount of oil supply can be changed by changing the number and volume of the fourth oil supply grooves 14.

[0052] In summary, the oil supply structure of a rotary compressor provided by the present invention enables the lubricating oil in the high-pressure oil pool 6 to intermittently supply oil to the friction positions related to the short shaft 41 and the long shaft 42 through the intermittent connection between the first oil supply groove 11 and the second oil supply groove 12, and the intermittent connection between the third oil supply groove 13 and the fourth oil supply groove 14, thereby achieving long-term continuous oil supply, thereby improving the service life and performance of the compressor.

[0053] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. An oil supply structure for a rotary compressor, characterized in that: The rotary compressor comprises a lower cylinder head, a cylinder, an upper cylinder head, a crankshaft, a piston, a high-pressure oil pool, a first low-pressure oil pool and a second low-pressure oil pool; the high-pressure oil pool is connected to the inner wall side of the piston through a through hole on the lower cylinder head and / or the upper cylinder head; the lower cylinder head is arranged between the cylinder and the first low-pressure oil pool; the upper cylinder head is arranged between the cylinder and the second low-pressure oil pool; the crankshaft comprises a short shaft and a long shaft; The oil supply structure comprises a first oil supply groove, a second oil supply groove, a third oil supply groove and a fourth oil supply groove; The first oil supply groove is arranged on one of the lower cylinder head and the short shaft, and the second oil supply groove is arranged on the other of the lower cylinder head and the short shaft; the number of the first oil supply grooves is more than one, and one end of one of the first oil supply grooves is connected to the inner wall side of the piston; during the rotation of the short shaft, the second oil supply groove is intermittently connected to the first oil supply groove adjacent thereto, and the second oil supply groove or the other of the first oil supply grooves is connected to the first low-pressure oil pool; The third oil supply groove is arranged on one of the upper cylinder head and the long shaft, and the fourth oil supply groove is arranged on the other of the upper cylinder head and the long shaft; the number of the third oil supply grooves is more than one, and one end of one of the third oil supply grooves is connected to the inner wall side of the piston; during the rotation of the long shaft, the fourth oil supply groove and the third oil supply groove adjacent thereto are intermittently connected, and the fourth oil supply groove or the other of the third oil supply grooves is connected to the second low-pressure oil pool.

2. The oil supply structure of a rotary compressor according to claim 1, characterized in that: The first oil supply groove is arranged on the lower cylinder cover along the extension direction of the short shaft and is located on the surface where the lower cylinder cover matches the short shaft; the second oil supply groove is arranged on the outer surface of the short shaft along the circumference of the short shaft.

3. The oil supply structure of a rotary compressor according to claim 2, characterized in that: The crankshaft includes more than one eccentric portion, and the opening direction of the second oil supply groove is the same as the protruding direction of the eccentric portion adjacent thereto.

4. The oil supply structure of a rotary compressor according to claim 3, characterized in that: The crankshaft includes the long shaft, the upper eccentric part, the lower eccentric part and the short shaft which are connected in sequence, and the second oil supply groove is coaxial with the upper eccentric part.

5. The oil supply structure of a rotary compressor according to claim 2, characterized in that: The circumferential length of the opening of the second oil supply groove along the short axis is L1, the diameter of the short axis is Φ1, 0.5Φ1<L1<0.8Φ1; the height of the lower cylinder head is H1, and the axial height of the second oil supply groove along the lower cylinder head is h1, 1 / 10H1≤h1≤1 / 3H1.

6. The oil supply structure of a rotary compressor according to claim 1, characterized in that: The third oil supply groove is arranged on the upper cylinder cover along the extension direction of the long axis and is located on the surface of the upper cylinder cover matching the long axis; the fourth oil supply groove is arranged on the outer surface of the long axis along the circumferential direction of the long axis.

7. The oil supply structure of a rotary compressor according to claim 6, characterized in that: The crankshaft includes more than one eccentric portion, and the opening direction of the fourth oil supply groove is the same as the protruding direction of the eccentric portion adjacent thereto.

8. The oil supply structure of a rotary compressor according to claim 7, characterized in that: The crankshaft includes the long shaft, the upper eccentric part, the lower eccentric part and the short shaft which are connected in sequence, and the fourth oil supply groove is coaxial with the lower eccentric part.

9. The oil supply structure of a rotary compressor according to claim 6, characterized in that: The circumferential length of the opening of the fourth oil supply groove along the major axis is L2, the diameter of the major axis is Φ2, 0.5Φ2<L2<0.8Φ2; the height of the upper cylinder head is H2, the axial height of the fourth oil supply groove along the upper cylinder head is h2, 1 / 10H2≤h2≤1 / 3H2.

10. The oil supply structure of a rotary compressor according to claim 1, characterized in that: The second oil supply groove and the fourth oil supply groove have the same size.

Images