JP2017223150A - Compressor capable of limiting oil supply to bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of oil rise without greatly lowering a cost performance ratio, by effectively utilizing an oil which has finished lubrication of a bearing to other purposes.SOLUTION: A compressor includes: a casing having a low-pressure space and a high-pressure space; a compression element having a compression chamber 53; a crank shaft 30; a first bearing 41; a second bearing 42; an oil storage part; a first oil supply path 36; a second oil supply path 45; and a third oil supply path 90. The compression element discharges a high-pressure fluid to the high-pressure space. The crank shaft has: a main shaft part 31 supported by the first bearing 41; and an eccentric part 32 supported by the second bearing 42. The oil storage part stores an oil. The first oil supply path supplies the oil stored in the oil storage part to the second bearing. The second oil supply path allows one part of the oil supplied to the second bearing to reach the first bearing. The third oil supply path utilizes a pressure difference between the high-pressure space and the compression chamber and leads one part of the oil which has reached the first bearing to the compression chamber or to a thrust surface 54.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a compressor capable of limiting oil supply to a bearing.

  The compressor of an air conditioner has a bearing for supporting a rotating crankshaft. The crankshaft and the bearing are supplied with lubricating oil, that is, oil for lubricating the sliding portion in order to prevent seizure. Oil is pumped up from an oil reservoir at the bottom of the compressor, and is first supplied to a plain bearing installed above. The oil spilled from the lubrication of the slide bearing then lubricates the rolling bearing. Finally, the oil that has flowed out of the rolling bearing falls downward. At this time, a part of the oil is scattered by the rotor of the motor to become a splash and is mixed with the gas refrigerant swirling in the casing. This causes an undesirable phenomenon of “oil rise” in which oil is discharged out of the compressor together with the high-pressure refrigerant discharged from the compressor. Therefore, in the compressor disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2013-002350), a pipe is provided for dropping oil that has flowed out of the rolling bearing directly to the oil reservoir.

  The oil rise prevention measure that installs a large dedicated pipe just for the purpose of dropping the used oil has little contribution to the performance against the cost increase.

  An object of the present invention is to suppress the occurrence of oil rising without significantly reducing the cost-performance ratio by effectively using the oil whose bearing has been lubricated for other applications.

  A compressor according to a first aspect of the present invention includes a casing, a compression element, a crankshaft, a first bearing, a second bearing, an oil reservoir, a first oil supply path, and a second oil supply path. A third oil supply path. The casing has a low-pressure space in which low-pressure fluid is accommodated and a high-pressure space in which high-pressure fluid is accommodated. The compression element has a compression chamber, and discharges the high pressure fluid generated by compressing the low pressure fluid in the compression chamber to the high pressure space. The crankshaft is provided in the high-pressure space and has a main shaft portion and an eccentric portion that is eccentric from the main shaft portion. The first bearing is provided in the high-pressure space and supports the main shaft portion. The second bearing is provided in the high-pressure space and supports the eccentric portion. The oil reservoir is provided in the high-pressure space and stores oil. The first oil supply path supplies oil stored in the oil storage part to the second bearing. The second oil supply path causes a part of the oil supplied to the second bearing to reach the first bearing. The third oil supply path guides at least a part of the oil that has reached the first bearing to the compression chamber or the vicinity of the compression chamber by utilizing a pressure difference between the high-pressure space and the compression chamber.

  According to this configuration, the third oil supply path guides at least part of the oil reaching the first bearing to the compression chamber or the vicinity of the compression chamber. Therefore, since the oil that has finished the lubrication of the first bearing is used for the lubrication of the compression element, it is possible to suppress the occurrence of oil rise without significantly reducing the cost-performance ratio.

  The compressor which concerns on the 2nd viewpoint of this invention is a compressor which concerns on a 1st viewpoint, and is further provided with the oil holding | maintenance part provided under the 1st bearing.

  According to this configuration, the oil retaining portion is provided under the first bearing. Therefore, it is possible to hold the oil that has finished lubricating the first bearing.

  The compressor which concerns on the 3rd viewpoint of this invention is a compressor which concerns on a 2nd viewpoint. WHEREIN: An oil holding | maintenance part contains an oil recovery ring.

  According to this configuration, the oil holding portion includes the ring member. Therefore, by appropriately designing the inner diameter of the ring member, it is possible to limit the amount of oil falling from the oil holding portion.

  In the compressor according to the fourth aspect of the present invention, in the compressor according to the second aspect or the third aspect, the third oil supply path guides at least part of the oil from the oil holding portion to the compression chamber or the vicinity of the compression chamber. .

  According to this configuration, the third oil supply path guides the oil stored in the reservoir structure to the compression element. Therefore, the oil stored in the oil holding part can be used for lubricating the compression element.

  The compressor which concerns on the 5th viewpoint of this invention is a compressor which concerns on any one of a 1st viewpoint to the 4th viewpoint, and is further provided with the oil supply amount limiting member and the oil discharge path | route. The oil supply amount limiting member is provided in the second oil supply path in order to limit the amount of oil reaching the first bearing from the second bearing. The oil drainage path directs a part of the oil supplied to the second bearing toward the inner surface of the casing.

  According to this configuration, the oil flowing out from the second bearing branches into two paths, a second oil supply path leading to the first bearing and an oil drain path leading to the inner surface of the casing. In addition, the flow rate of the second oil supply path is limited by the oil supply amount limiting member. Therefore, the amount of oil flowing out from the first bearing can be reduced.

  The compressor which concerns on the 6th viewpoint of this invention is a compressor which concerns on a 5th viewpoint, The throttle member which gives resistance to oil is provided in the 3rd oil supply path | route.

  According to this configuration, the throttle member provides resistance to the oil in the third oil supply path. Therefore, the amount of oil supplied to the compression element can be optimized by appropriately designing the throttle member.

  A compressor according to a seventh aspect of the present invention is the compressor according to any one of the first to sixth aspects, wherein the compression element has a fixed scroll and a movable scroll. The fixed scroll is fixed to the casing. The movable scroll can move with respect to the fixed scroll. The compression chamber is defined by a fixed scroll and a movable scroll. The movable scroll is disposed on the thrust surface so as to be pressed against the fixed scroll. The third oil supply path supplies oil to the thrust surface.

  According to this configuration, oil is supplied to the thrust surface. Therefore, the sliding between the fixed scroll and the movable scroll is facilitated, and the sealing performance thereof is ensured.

  With the compressor according to the present invention, it is possible to suppress the occurrence of oil rising.

It is sectional drawing of the compressor 10 which concerns on one Embodiment of this invention. 2 is an enlarged cross-sectional view of the compressor 10. FIG.

  Hereinafter, embodiments of an air conditioner according to the present invention will be described with reference to the drawings. In addition, the specific structure of the air conditioning apparatus concerning this invention is not restricted to the following embodiment, In the range which does not deviate from the summary of invention, it can change suitably.

(1) Overall Configuration FIG. 1 shows a compressor 10 according to an embodiment of the present invention. The compressor 10 is mounted on a refrigerant circuit of an air conditioner, sucks and compresses a low-pressure refrigerant that is a fluid, and discharges the high-pressure refrigerant. The compressor 10 includes a casing 11, a motor 20, a crankshaft 30, a compression element 50, a first bearing 41, a second bearing 42, a third bearing 43, an upper support member 70, and a lower support member 79.

(2) Detailed configuration (2-1) Casing 11
The casing 11 accommodates the components of the compressor 10 and the refrigerant, and has a strength that can withstand the high pressure of the refrigerant. The casing 11 is provided with a suction pipe 15 for sucking low-pressure refrigerant and a discharge pipe 16 for discharging high-pressure refrigerant. An oil reservoir 18 is provided at the bottom of the casing 11 for storing lubricating oil, that is, oil used for lubrication of the sliding portion. The internal space of the casing 11 includes a low-pressure space 61 filled with a low-pressure refrigerant and a high-pressure space 62 filled with a high-pressure refrigerant. The low pressure space 61 and the high pressure space 62 are separated by a separating member 63.

(2-2) Motor 20
The motor 20 receives power supply and generates power for the compression element 50. The motor 20 has a stator 21 and a rotor 22. The stator 21 is fixed directly or indirectly to the casing 11. The rotor 22 can rotate by performing a magnetic interaction with the stator 21.

(2-3) Crankshaft 30
The crankshaft 30 transmits power generated by the motor 20 to drive the compression element 50. The crankshaft 30 is fixed to the rotor 22 and rotates together with the rotor 22. The crankshaft 30 has a main shaft portion 31 and an eccentric portion 32. The main shaft portion 31 has a cylindrical shape centering on the rotation axis of the crankshaft 30. The eccentric portion 32 is eccentric with respect to the rotation axis of the crankshaft 30.

  An oil lift mechanism 34 is provided on the crankshaft 30. The oil lift mechanism 34 supplies oil to each part of the compressor 10. The oil lift mechanism 34 includes an oil pumping mechanism 35 and a first oil supply path 36.

  The oil pumping mechanism 35 is provided below the crankshaft 30. The oil pumping mechanism 35 is a mechanism for pumping oil from the oil reservoir 18. The oil pumping mechanism 35 uses the rotation of the crankshaft 30 for pumping operation.

  The first oil supply path 36 is an oil passage formed inside the crankshaft 30. The oil pumped up by the oil pumping mechanism 35 rises through the first oil supply path 36.

(2-4) Compression element 50
The compression element 50 is a mechanism for compressing a fluid refrigerant. The compression element 50 has a fixed scroll 51 and a movable scroll 52. The fixed scroll 51 is fixed to the casing 11. The movable scroll 52 can revolve with respect to the fixed scroll.

  A compression chamber 53 is defined by the fixed scroll 51 and the movable scroll 52. As the movable scroll 52 revolves, the volume of the compression chamber 53 varies, and the refrigerant is compressed. The high-pressure refrigerant that has undergone the compression process is discharged from the compression element 50 to the high-pressure space 62.

(2-5) First bearing 41, upper support member 70
The first bearing 41 is a rolling bearing that supports the main shaft portion 31. The first bearing 41 is supported by the upper support member 70. The upper support member 70 is made of metal and is directly or indirectly fixed to the casing 11. The upper support member 70 supports the fixed scroll 51 directly or indirectly.

(2-6) Second bearing 42
The second bearing 42 is a slide bearing that pivotally supports the eccentric portion 32. The second bearing 42 is installed on the movable scroll 52. When the eccentric portion 32 rotates eccentrically while sliding with the second bearing 42, the movable scroll 52 can make a revolving motion.

(2-7) Third bearing 43, lower support member 79
Similar to the first bearing 41, the third bearing 43 is a rolling bearing that supports the main shaft portion 31. The third bearing 43 is supported by the lower support member 79. The lower support member 79 is made of metal and is fixed directly or indirectly to the casing 11.

(3) Oil Supply Path Group FIG. 2 is an enlarged cross-sectional view of the compressor 10 and shows an oil supply path group. The oil supply path group lubricates mechanical sliding portions existing at various locations of the compressor 10. The oil supply path group includes a first oil supply path 36, an oil supply amount limiting member 46, an oil discharge path 93, a second oil supply path 45, and a third oil supply path 90.

(3-1) First oil supply path 36
The first oil supply path 36 pumps oil from the oil reservoir 18 and supplies it to the second bearing 42.

(3-2) Oil supply amount limiting member 46
The oil supply amount limiting member 46 receives the oil that has finished lubricating the second bearing 42 and distributes the oil to the oil discharge path 93 and the second oil supply path 45 at a predetermined distribution ratio. The distribution ratio of the oil discharge path 93 and the second oil supply path 45 is, for example, 9 to 1.

  The oil supply amount limiting member 46 is a ring-shaped member that restricts the amount of oil traveling toward the second oil supply path 45. The outer diameter of the ring member is substantially in contact with the upper support member 70. The inner diameter of the ring member is set so as to create a gap allowing oil to pass between the ring member 30 and the crankshaft 30. By appropriately designing the inner diameter and the clearance, the amount of oil traveling from the oil holding portion to the first bearing 41 can be limited to a certain extent that is effective in suppressing oil rising.

(3-3) Oil drainage path 93
The oil discharge path 93 discharges unnecessary oil from the oil supply amount limiting member 46. Specifically, the oil discharge path 93 sends oil from the oil supply amount limiting member 46 to the inner surface of the casing 11. Thereafter, the oil descends to the oil reservoir 18 along the inner surface of the casing 11.

(3-4) Second oil supply path 45
The second oil supply path 45 guides oil from the oil supply amount limiting member 46 to the first bearing 41.

(3-5) Third oil supply path 90
The third oil supply path 90 receives the oil that has finished lubricating the first bearing 41 and moves it to the compression element 50. The third oil supply path 90 includes an oil holding part 91 and an oil supply mechanism 80 subsequent thereto.

(3-5-1) Oil holding part 91
The oil holding unit 91 holds a certain amount of oil. The oil holding unit 91 is a member that limits the amount of oil that falls from the oil holding unit 91. The oil holding capacity of the oil holding portion 91 is sufficiently large to be effective for suppressing oil rising.

(3-5-2) Oil supply mechanism 80
The oil supply mechanism 80 includes an oil supply path 81 and a throttle member 82.

  The oil supply passage 81 is a passage for moving the oil held in the oil holding portion 91 to the compression element 50. The oil supply passage 81 includes a support member passage 75 provided in the upper support member 70 and a fixed scroll passage 55 provided in the fixed scroll 51. The support member passage 75 and the fixed scroll passage 55 communicate with each other.

  A throttle member 82 is provided in the fixed scroll passage 55. The throttle member 82 is a member that determines the magnitude of resistance acting on the oil flowing through the oil supply passage 81. The throttle member 82 is, for example, a spiral shaft, that is, a member having a generally elongated cylindrical shape and having a spiral groove formed on the surface thereof. Since the cross-sectional area of the spiral groove is small, the oil passing through the spiral groove is subjected to resistance. A desired resistance can be realized by appropriately designing the length of the throttle member 82, the thickness of the spiral groove, and the like.

(4) Oil supply operation Oil is supplied to each part by the following operation.

(4-1) Oil Lift from Oil Storage Unit 18 The oil is pumped up from the oil storage unit 18 by the oil pumping mechanism 35 shown in FIG. As shown in FIG. 2, the oil reaches the upper end of the crankshaft 30 and moves toward the outer periphery of the eccentric portion 32.

(4-2) Lubrication of the second bearing 42 The oil falls while lubricating the second bearing 42.

(4-3) Branching Oil is temporarily stored in the oil supply amount limiting member 46. Thereafter, the oil branches into two paths, a second oil supply path 45 and an oil discharge path 93. The oil that enters the oil drainage path 93 goes to the inner surface of the casing 11, and then travels down the inner surface of the casing 11 and falls to the oil reservoir 18.

(4-5) Lubrication of the first bearing 41 The oil that enters the second oil supply path 45 from the oil supply amount limiting member 46 goes to the first bearing 41. Thereafter, the oil descends while lubricating the first bearing 41.

(4-6) Holding The oil descending from the first bearing 41 is temporarily held in the oil holding portion 91 and then enters the support member passage 75 which is one end of the third oil supply path 90. The upper limit holding amount of oil in the oil holding portion 91 is a size that is effective for suppressing oil rising. However, when there is an inflow of oil that exceeds the upper limit holding amount of the oil holding portion 91, the oil falls downward.

(4-7) Lubrication of the compression element 50 The upper support member 70 is disposed in the high-pressure space 62. The pressure of the refrigerant in the compression chamber 53 is generally lower than the pressure of the refrigerant in the high pressure space 62. Therefore, when oil is present in the support member passage 75, the oil passes through the third oil supply path 90 due to a pressure difference between the high pressure space 62 and the compression chamber 53, and the thrust surface in the vicinity of the compression chamber 53. 54, where the compression element 50 is lubricated.

(5) Features (5-1)
The third oil supply path 90 guides at least a part of the oil reaching the first bearing 41 to the compression chamber 53 or the thrust surface 54 in the vicinity thereof. Therefore, since the oil that has finished the lubrication of the first bearing 41 is used for the lubrication of the compression element 50, it is possible to suppress the occurrence of the oil rise without significantly reducing the cost performance ratio.

(5-2)
An oil holding portion 91 is provided below the first bearing 41. Therefore, the oil that has finished the lubrication of the first bearing 41 can be retained.

(5-3)
The oil holding part 91 includes a ring member. Therefore, by appropriately designing the inner diameter of the ring member, the amount of oil falling from the oil holding portion 91 can be limited.

(5-4)
The third oil supply path 90 guides at least part of the oil from the oil holding portion 91 to the compression chamber 53 or the thrust surface 54 in the vicinity thereof. Therefore, the oil stored in the oil holding portion 91 can be used for lubricating the compression element 50.

(5-5)
The oil flowing out from the second bearing 42 branches into two paths, a second oil supply path 45 leading to the first bearing 41 and a drain oil path 93 leading to the inner surface of the casing 11. In addition, the flow rate of the second oil supply path 45 is limited by the oil supply amount limiting member 46. Therefore, the amount of oil flowing out from the first bearing 41 can be reduced.

(5-6)
In the third oil supply path 90, the throttle member 82 provides resistance to the oil. Therefore, the amount of oil supplied to the compression element 50 can be optimized by appropriately designing the throttle member 82.

(5-7)
Oil is supplied to the thrust surface 54. Therefore, the sliding between the fixed scroll 51 and the movable scroll 52 is smoothed, and the sealing performance thereof is ensured.

DESCRIPTION OF SYMBOLS 10 Compressor 11 Casing 15 Intake pipe 16 Discharge pipe 18 Oil storage part 20 Motor 21 Stator 22 Rotor 30 Crankshaft 31 Main shaft part 32 Eccentric part 34 Oil lift mechanism 35 Oil pumping mechanism 36 1st oil supply path 41 1st bearing (rolling bearing) )
42 Second bearing (slide bearing)
43 Third bearing (rolling bearing)
45 Second oil supply path 46 Oil supply amount limiting member 50 Compression element 51 Fixed scroll 52 Movable scroll 53 Compression chamber 54 Thrust surface 55 Fixed scroll passage 61 Low pressure space 62 High pressure space 63 Separation member 70 Upper support member 75 Support member passage 79 Lower support Member 80 Oil supply mechanism 81 Third oil supply path 82 Drawing member 91 Oil holding part 93 Oil discharge path

JP 2013-002350 A

Claims (7)

A casing (11) having therein a low-pressure space (61) in which low-pressure fluid is accommodated and a high-pressure space (62) in which high-pressure fluid is accommodated;
A compression element (50) having a compression chamber (53) and discharging the high-pressure fluid generated by compressing the low-pressure fluid in the compression chamber to the high-pressure space;
A crankshaft (30) provided in the high-pressure space and having a main shaft portion (31) and an eccentric portion (32) eccentric from the main shaft portion;
A first bearing (41) provided in the high-pressure space and supporting the main shaft portion;
A second bearing (42) provided in the high-pressure space and supporting the eccentric portion;
An oil reservoir (18) that is provided in the high-pressure space and stores oil;
A first oil supply path (36) for supplying the oil stored in the oil storage part to the second bearing;
A second oil supply path (45) for allowing a part of the oil supplied to the second bearing to reach the first bearing;
A third oil supply path (81) for guiding at least a part of the oil reaching the first bearing to the compression chamber or the vicinity (54) of the compression chamber using a pressure difference between the high-pressure space and the compression chamber When,
A compressor (10). An oil retaining portion (91) provided under the first bearing;
Further comprising
The compressor according to claim 1. The oil retaining portion includes a ring member;
The compressor according to claim 2. The third oil supply path guides the at least part of the oil from the oil holding portion to the compression chamber or the vicinity of the compression chamber.
The compressor according to claim 2 or claim 3. An oil supply amount limiting member (46) provided in the second oil supply path for limiting the amount of the oil reaching the first bearing from the second bearing;
An oil discharge path (93) for directing a part of the oil supplied to the second bearing toward the inner surface of the casing;
Further comprising
The compressor according to any one of claims 1 to 4. The third oil supply path is provided with a throttle member (82) that provides resistance to the oil.
The compressor according to claim 5. The compression element is
A fixed scroll (51) fixed to the casing;
A movable scroll (52) movable relative to the fixed scroll;
Have
The compression chamber is defined by the fixed scroll and the movable scroll;
The movable scroll is disposed on the thrust surface (54) so as to be pressed against the fixed scroll,
The third oil supply path supplies the oil to the thrust surface;
The compressor according to any one of claims 1 to 6.

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