An oil supply structure for a rotary compressor

Abstract

This invention provides an oil supply structure for a rotary compressor, including 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 located on one of the lower cylinder head and the short shaft, and the second oil supply groove is located on the other of the lower cylinder head and the short shaft. One end of one of the first oil supply grooves is connected to the inner wall of the piston. During the rotation of the short shaft, the second oil supply groove and its adjacent first oil supply groove are intermittently connected, and either the second oil supply groove or the other of the first oil supply grooves is connected to a first low-pressure oil sump. The third oil supply groove is located on one of the upper cylinder head and the long shaft, and the fourth oil supply groove is located on the other of the upper cylinder head and the long shaft. During the rotation of the long shaft, the fourth oil supply groove and its adjacent third oil supply groove are intermittently connected. This design allows the lubricating oil in the high-pressure oil sump to intermittently supply oil to the friction positions related to the short and long shafts, thereby achieving long-term continuous oil supply.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to an oil supply structure for a rotary compressor. Background Technology

[0002] Rotary compressors include three types: the first type is a high back pressure compressor, where the casing is a high-pressure chamber and the motor, pump body, and oil sump are located in the high-pressure chamber; the second type is a low back pressure compressor, where the casing is a low-pressure chamber and the motor, pump body, and oil sump are located in the low-pressure chamber; the third type is a compressor with a low-pressure motor and a high-pressure pump body, where the compressor's interior includes two sealed chambers, one high-pressure and one low-pressure chamber. In most cases, the upper cylinder head is the dividing point between the two sealed chambers. The sealed chamber on the motor side is the low-pressure chamber, and the sealed chamber on the pump body side is the high-pressure chamber. The pump body and the high-pressure oil sump are located in the sealed chamber on the pump body side.

[0003] For the first and second types of compressors, oil supply holes are usually set on the crankshaft. The oil supply holes include a vertical section and a horizontal section. The vertical section is set along the axis of the crankshaft, and the horizontal section is perpendicularly connected to the vertical section. Lubricating oil is drawn in from one end of the vertical section. When the crankshaft rotates, the lubricating oil rises to the other end of the vertical section by 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 type of compressor, since the motor side sealing cavity in the third type of compressor is a low-pressure cavity and the pump body side sealing cavity is a high-pressure cavity, the lubricating oil will be quickly pumped from the oil sump into the motor side sealing cavity under the action of air pressure difference. The oil sump on the pump body side will be short of oil, and the oil supply structure cannot supply oil continuously for a long time, causing the compressor reliability problem. Summary of the Invention

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

[0006] To solve the above-mentioned technical problems, the present invention provides an oil supply structure for 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 sump, a first low-pressure oil sump, and a second low-pressure oil sump; the high-pressure oil sump communicates with the inner wall of the piston through a through hole on the lower cylinder head and / or the upper cylinder head; the lower cylinder head is disposed between the cylinder and the first low-pressure oil sump; the upper cylinder head is disposed between the cylinder and the second low-pressure oil sump; the crankshaft comprises a short shaft and a long shaft;

[0007] The oil supply structure includes a first oil supply tank, a second oil supply tank, a third oil supply tank, and a fourth oil supply tank;

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

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

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

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

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

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

[0014] Optionally, the third oil supply groove is disposed on the upper cylinder head along the extension direction of the long axis and is located on the surface of the upper cylinder head that mates with the long axis; the fourth oil supply groove is disposed on the outer surface of the long axis along the circumference of the long axis.

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

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

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

[0018] Optionally, the second oil supply tank and the fourth oil supply tank are the same size.

[0019] This invention provides an oil supply structure for a rotary compressor. Through intermittent communication between the first and second oil supply grooves, and between the third and fourth oil supply grooves, lubricating oil from the high-pressure oil sump is intermittently supplied to the friction points related to the short and long shafts, thereby achieving long-term continuous oil supply and improving the compressor's service life and performance. Simultaneously, by providing the second and fourth oil grooves on the crankshaft with their opening directions aligned with the protruding directions of their adjacent eccentric portions, the dynamic balance of the crankshaft is improved, reducing vibrations generated during high-speed crankshaft rotation and further enhancing the compressor's reliability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the oil supply structure of a rotary compressor according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the oil supply structure of a rotary compressor according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of an upper cylinder head provided in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of a crankshaft provided in an embodiment of the present invention.

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

[0025] Figure 6 This is a schematic diagram of a crankshaft provided in an embodiment of the present invention.

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

[0027] Figure 8 This is a schematic diagram of another crankshaft structure provided in an embodiment of the present invention.

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

[0029] Figure 10 This is a schematic diagram of another crankshaft structure provided in an embodiment of the present invention.

[0030] [The annotations in the attached figures are explained below]:

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

[0032] First oil supply tank-11, second oil supply tank-12, third oil supply tank-13, fourth oil supply tank-14, connecting line-15;

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

[0034] The centroid of the second oil supply tank is -121, and the centroid of the fourth oil supply tank is -141.

[0035] Upper eccentric part -431, lower eccentric part -432, center of mass corresponding to the eccentric part -433. Detailed Implementation

[0036] To make the objectives, advantages, and features of the present invention clearer, the oil supply structure of a rotary compressor proposed in this invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the explanation of the embodiments of the present invention.

[0037] In the description of this invention, the terms "first," "second," and other qualifiers are added for convenience of description and reference, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with qualifiers such as "first" and "second" may explicitly or implicitly include one or more of that feature.

[0038] like Figures 1-7As shown, this embodiment provides an oil supply structure for a rotary compressor. The rotary compressor includes a lower cylinder head 1, a cylinder 2, an upper cylinder head 3, a crankshaft 4, a piston 5, a high-pressure oil sump 6, a first low-pressure oil sump 7, and a second low-pressure oil sump 8. The high-pressure oil sump 6 communicates with the inner wall 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 disposed between the cylinder 2 and the first low-pressure oil sump 7. The upper cylinder head 3 is disposed between the cylinder 2 and the second low-pressure oil sump 8. The crankshaft 4 includes a short shaft 41 and a long shaft 42. The oil supply structure includes 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 disposed on one of the lower cylinder head 1 and the short shaft 41, and the second oil supply groove 12 is disposed on the other of the lower cylinder head 1 and the short shaft 41. The number of 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 of the piston 5; during the rotation of the short shaft 41, the second oil supply groove 12 and the adjacent first oil supply groove 11 are intermittently connected, and the second oil supply groove 12 or the other first oil supply groove 11 is connected to the first low-pressure oil sump 7; the third oil supply groove 13 is provided on one of the upper cylinder head 3 and the long shaft 42, and the fourth oil supply groove 14 is provided on the other of the upper cylinder head 3 and the long shaft 42; there is more than one third oil supply groove 13, and one end of the third oil supply groove 13 is connected to the inner wall of the piston 5; during the rotation of the long shaft 42, the fourth oil supply groove 14 and the adjacent third oil supply groove 13 are intermittently connected, and the fourth oil supply groove 14 or the other third oil supply groove 13 is connected to the second low-pressure oil sump 8.

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

[0040] This embodiment provides an oil supply structure for a rotary compressor. Through intermittent communication between the first oil supply tank 11 and the second oil supply tank 12, and between the third oil supply tank 13 and the fourth oil supply tank 14, the lubricating oil in the high-pressure oil sump 6 is intermittently supplied to the friction positions related to the short shaft 41 and the long shaft 42, thereby achieving long-term continuous oil supply and 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 disposed on the lower cylinder head 1 along the extending direction of the short shaft 41, and is located on the surface of the lower cylinder head 1 that mates with the short shaft 41; the second oil supply groove 12 is disposed on the outer surface of the short shaft 41 along its circumference. This facilitates the machining 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 one or more eccentric portions 43. The opening direction of the second oil supply groove 12 is the same as the protrusion direction of the adjacent eccentric portion 43. When the opening direction of the second oil supply groove 12 is the same as the protrusion direction of the adjacent eccentric portion 43, the line connecting the center of the second oil supply groove 12 and the center of the major and minor shafts is collinear with the line connecting the eccentric portion 43 and the center of the major and minor shafts (reference). Figure 5As shown in line 15 in the diagram, this allows the center of mass 121 corresponding to the second oil supply groove 12 and the center of mass 433 corresponding to the eccentric part 43 to be distributed on both sides of the center line 44 of the long and short shafts, thereby making the center of mass of the crankshaft 4 move closer to the center of the crankshaft 4, improving 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 portion 431, the lower eccentric portion 432, and the short shaft 41 connected in sequence. The second oil supply groove 12 is coaxial with the upper eccentric portion 431. This allows the second oil supply groove 12 and the upper eccentric portion 431 to be machined simultaneously in a single setup, making machining convenient.

[0044] Optional, see reference Figure 1 , Figure 7 and Figure 9 As shown, the length of the opening of the second oil supply groove 12 along the circumferential direction of the minor axis 41 is L1 (reference). 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). Figure 9 The height of the second oil supply groove 12 along the axial direction of the lower cylinder head 1 is h1 (reference H2). Figure 9 h2), 1 / 10H1≤h1≤1 / 3H1. This allows for a larger oil storage capacity in the second oil supply groove 12 while maintaining the strength of the short shaft 41. 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, i.e., the upper spacing a1≥1 / 3H1, the lower spacing b1≥1 / 3H1, and a1 is referenced. Figure 9 a2, b1 reference Figure 9 b2.

[0045] Optional, such as Figure 1 and Figure 4 As shown, the third oil supply groove 13 is disposed 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 mates with the long axis 42; the fourth oil supply groove 14 is disposed on the outer surface of the long axis 42 along its circumference. This facilitates the machining 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 one or more eccentric portions 43, and the opening direction of the fourth oil supply groove 14 is the same as the protrusion direction of the adjacent eccentric portion 43. When the opening direction of the fourth oil supply groove 14 is the same as the protrusion direction of the adjacent eccentric portion 43, the line connecting the center of the fourth oil supply groove 14 and the center of the major and minor shafts is collinear with the line connecting the eccentric portion 43 and the center of the major and minor shafts (e.g., ...). Figure 5 As shown in line 15 in the diagram, this allows the center of mass 141 corresponding to the fourth oil supply groove 14 and the center of mass 433 corresponding to the eccentric part 43 to be distributed on both sides of the center line 44 of the long and short shafts, thereby making the center of mass of the crankshaft 4 move closer to the center of the crankshaft 4, improving 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 portion 431, the lower eccentric portion 432, and the short shaft 41 connected in sequence. The fourth oil supply groove 14 is coaxial with the lower eccentric portion 432. This allows the fourth oil supply groove 14 and the lower eccentric portion 432 to be machined simultaneously in a single setup, making machining convenient.

[0048] Optional, such as Figure 1 , Figure 7 and Figure 9 As shown, the opening of the fourth oil supply groove 14 has a circumferential length of L2 along the major axis 42, and the diameter of the major axis 42 is Φ2, where 0.5Φ2 < L2 < 0.8Φ2; the height of the upper cylinder head 3 is H2, and the axial height of the fourth oil supply groove 14 along the upper cylinder head 3 is h2, where 1 / 10H2 ≤ h2 ≤ 1 / 3H2. This allows for a larger oil storage capacity in the fourth oil supply groove 14 while maintaining the strength of the major axis 42. 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, i.e., 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 are the same size. This facilitates the machining of the second oil supply groove 12 and the fourth oil supply groove 14.

[0050] Optional, such as Figure 10 As shown, there are multiple second oil supply tanks 12. These multiple second oil supply tanks 12 can be arranged in parallel. The oil supply volume can be changed by altering the number and volume of the second oil supply tanks 12.

[0051] Optional, such as Figure 10 As shown, there are multiple fourth oil supply tanks 14. These multiple fourth oil supply tanks 14 can be arranged in parallel. The oil supply volume can be changed by altering the number and volume of the fourth oil supply tanks 14.

[0052] In summary, the oil supply structure of the rotary compressor provided by the present invention, 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, allows the lubricating oil in the high-pressure oil sump 6 to intermittently supply oil to the friction positions related to the short shaft 41 and the long shaft 42, thereby achieving long-term continuous oil supply and improving the service life and performance of the compressor.

[0053] The above description is only a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those 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 of a rotary compressor, characterized by comprising: The rotor compressor comprises a lower cylinder cover, a cylinder, an upper cylinder cover, 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 communicated with the inner wall side of the piston through a through hole on the lower cylinder cover and / or the upper cylinder cover; the lower cylinder cover is arranged between the cylinder and the first low-pressure oil pool; the upper cylinder cover 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 number of the first oil supply grooves is more than one, one of the first oil supply grooves is communicated with the inner wall side of the piston at one end, and the second oil supply groove and the first oil supply groove adjacent to the second oil supply groove are intermittently communicated during the rotation of the short shaft, and the second oil supply groove or another of the first oil supply grooves is communicated with the first low-pressure oil pool. The third oil supply groove is arranged on one of the upper cylinder cover and the long shaft, and the fourth oil supply groove is arranged on the other of the upper cylinder cover and the long shaft; the number of the third oil supply grooves is more than one, one of the third oil supply grooves is communicated with the inner wall side of the piston at one end, and the fourth oil supply groove and the third oil supply groove adjacent to the fourth oil supply groove are intermittently communicated during the rotation of the long shaft, and the fourth oil supply groove or another of the third oil supply grooves is communicated with the second low-pressure oil pool. 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 of the lower cylinder cover matched with the short shaft; and the second oil supply groove is arranged on the outer surface of the short shaft along the circumferential direction of the short shaft. The crankshaft comprises more than one eccentric part, the opening direction of the second oil supply groove is the same as the protruding direction of the eccentric part adjacent to the second oil supply groove; and the line connecting the center of the second oil supply groove and the center of the long and short shafts is collinear with the line connecting the eccentric part and the center of the long and short shafts.

2. The oil supply structure of a rotary compressor according to claim 1, wherein The crankshaft comprises the long shaft, an upper eccentric part, a lower eccentric part and the short shaft connected in sequence, and the second oil supply groove is coaxial with the upper eccentric part.

3. The oil supply structure of a rotary compressor according to claim 1, wherein The length of the opening of the second oil supply groove along the circumferential direction of the short shaft is L1, the diameter of the short shaft is Φ1, and 0.5Φ1 4. The oil supply structure of a rotary compressor according to claim 1, wherein The third oil supply groove is arranged on the upper cylinder cover along the extension direction of the long shaft and is located on the surface of the upper cylinder cover matched with the long shaft; and the fourth oil supply groove is arranged on the outer surface of the long shaft along the circumferential direction of the long shaft.

5. The oil supply structure of a rotary compressor according to claim 4, wherein The crankshaft comprises more than one eccentric part, the opening direction of the fourth oil supply groove is the same as the protruding direction of the eccentric part adjacent to the fourth oil supply groove.

6. The oil supply structure of a rotary compressor according to claim 5, wherein The crankshaft comprises the long shaft, an upper eccentric part, a lower eccentric part and the short shaft connected in sequence, and the fourth oil supply groove is coaxial with the lower eccentric part.

7. The oil supply structure of a rotary compressor according to claim 4, wherein The length of the opening of the fourth oil supply groove along the circumference of the long axis is L2, the diameter of the long axis is Φ2, and 0.5Φ2 8. The oil supply structure of a rotary compressor according to claim 1, wherein The height of the upper cylinder cover is H2, and the height of the fourth oil supply groove along the axial direction of the upper cylinder cover is h2, and 1 / 10H2≤h2≤1 / 3H2. The second oil supply groove and the fourth oil supply groove are of the same size.

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