Scroll compressor and refrigeration cycle device

Abstract

To provide a scroll compressor and a refrigeration cycle device that can ensure high functionality and reliability of the compressor. [Solution] The scroll compressor includes a container for storing lubricating oil, an electric motor, a rotating shaft rotated by the electric motor and having a through hole and an eccentric portion through which the lubricating oil flows, a frame member having an insertion hole through which the rotating shaft passes, a fixed scroll having a first surface and a spiral-shaped fixed wrap in a recess formed in the first surface and supported by the frame member, and an orbiting scroll having a second surface and a spiral-shaped orbiting wrap protruding from the second surface, which fits with the eccentric portion of the rotating shaft and forms a compression chamber for compressing refrigerant between the fixed wrap and the orbiting wrap. The fixed scroll has an arc-shaped circumferential groove in its first surface, and the orbiting scroll has an oil supply path for supplying lubricating oil from the through hole to the first surface, and an oil supply hole in its second surface that intermittently communicates with a compression chamber formed on the inner peripheral side of the orbiting wrap.

Description

[Technical Field]

[0001] The present invention relates to a scroll compressor and a refrigeration cycle device including the scroll compressor. [Background technology]

[0002] A scroll compressor includes components such as a fixed scroll, an orbiting scroll, a rotating shaft, and bearings, and supplies lubricating oil to sliding parts such as between the rotating shaft and the bearings and between the fixed scroll and the orbiting scroll.

[0003] However, scroll compressors are prone to variations in the amount of oil supplied depending on the machining precision of parts and operating conditions. If the amount of oil supplied is too little, reliability and performance will decrease, and if the amount of oil supplied is too much, there is a concern that the amount of oil leakage will increase, so appropriate oil supply is necessary.

[0004] Therefore, a scroll compressor is known in which a movable-side oil groove that communicates with a fixed-side oil groove intermittently communicates with a wrap groove of the fixed scroll, thereby enabling high-pressure lubricating oil to be reliably supplied to the compression chamber on the outer line side (see Patent Document 1).Also known is a scroll compressor in which a circumferential groove intermittently communicates with a back pressure chamber, thereby increasing the amount of oil supplied to the back pressure chamber without particularly increasing the amount of oil supplied to the compression chamber, thereby promoting lubrication of each sliding part in the back pressure chamber (see Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-077616 [Patent Document 2] Japanese Patent Application Publication No. 2023-172727 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-mentioned conventional technology, there was no path that could reliably supply lubricating oil to the internal compression chamber, resulting in an unstable amount of lubricating oil supply, which could result in a decrease in the functionality and reliability of the compressor. [Means for solving the problem]

[0007] In view of the above problems, the present invention provides a lubricating oil storage container, an electric motor housed within the container; a rotating shaft that is rotated by an electric motor and has a through hole through which lubricating oil flows and an eccentric portion; a frame member having an insertion hole through which the rotation shaft is inserted; a fixed scroll having a first surface and a spiral-shaped fixed wrap within a recess formed in the first surface, the fixed scroll being supported by a frame member; an orbiting scroll having a second surface and a spiral orbiting wrap protruding from the second surface, the orbiting scroll being fitted to the eccentric portion of the rotary shaft and forming a compression chamber for compressing a refrigerant between the fixed wrap and the orbiting wrap; Including, the fixed scroll has a circumferential groove extending in an arc shape on a first surface; A scroll compressor is provided in which the orbiting scroll has an oil supply path that supplies lubricating oil from the through hole to the first surface, and an oil supply hole in the second surface that intermittently communicates with a compression chamber formed on the inner side of the orbiting wrap. [Effects of the Invention]

[0008] According to the present invention, it is possible to ensure high functionality and reliability of the compressor. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing an example of the configuration of an air conditioning apparatus as an example of a refrigeration cycle apparatus. [Figure 2] FIG. 1 is a diagram showing an example of the configuration of a scroll compressor used in an air conditioning apparatus. [Figure 3] FIG. 3 is an enlarged view of the compression mechanism shown in FIG. 2. [Figure 4]FIG. 4 is a diagram illustrating the trajectory of an opening at the outlet of a fuel supply path. [Figure 5] FIG. 1 is a view of the fixed scroll and the orbiting scroll from their joint surface. [Figure 6] A diagram showing the connection between the two oil drain grooves and oil supply holes. [Figure 7] A diagram showing the transition in the communication state between two oil drain grooves, oil supply hole, back pressure chamber, external line chamber, and internal line chamber. DETAILED DESCRIPTION OF THE INVENTION

[0010] A refrigeration cycle device is a device that continuously cools or heats a fluid by circulating a refrigerant as a heat medium within a system while changing its pressure and state, and exchanging heat with the circulating refrigerant, and examples of such a device include refrigerators, chillers, air conditioners, etc. Hereinafter, the refrigeration cycle device will be described as an air conditioner, but is not limited to an air conditioner.

[0011] FIG. 1 is a diagram showing an example of the configuration of an air conditioner. The air conditioner 10 includes an indoor unit 11 installed in the space (indoors) to be air-conditioned, an outdoor unit 12 installed outdoors, and a controller operated by the user. The air conditioner 10 performs air conditioning by circulating a refrigerant between the indoor unit 11 and the outdoor unit 12 and exchanging heat with the indoor air, which is the fluid to be cooled or heated. For this reason, the indoor unit 11 and the outdoor unit 12 are connected by two refrigerant pipes for circulating the refrigerant.

[0012] The indoor unit 11 and the outdoor unit 12 may each be configured with two or more units, and two or more indoor units 11 may be connected to one outdoor unit 12. Hydrofluorocarbons (HFCs) and hydrofluoroolefins (HFOs) can be used as refrigerants. Examples of HFCs include R410A and R32. Examples of HFOs include R1234yf.

[0013] The indoor unit 11 communicates with the controller and receives various signals such as operation commands, stop commands, commands to change the set temperature, and commands to change the operation mode. The indoor unit 11 and the controller may be connected by a cable and communication may be performed wired, or wirelessly using infrared rays or the like. The indoor unit 11 is connected to the outdoor unit 12 via a communication line and works together with the outdoor unit 12 to condition the air in the room.

[0014] The indoor unit 11 starts up upon receiving an operation command from the controller, and instructs the outdoor unit 12 to start up. After starting up, the outdoor unit 12 adjusts the compressor rotation speed and the opening of the outdoor expansion valve, etc., and controls the amount of refrigerant circulating, etc., so that the indoor temperature becomes the set temperature.

[0015] The indoor unit 11 includes an indoor heat exchanger 20, an indoor fan 21, and an indoor fan motor 22 as a power device. The indoor fan 21 is driven by the indoor fan motor 22 to take in indoor air and send it to the indoor heat exchanger 20. The indoor heat exchanger 20 has heat transfer tubes through which a refrigerant flows, and is configured so that the sent air comes into contact with the surface of the heat transfer tubes to exchange heat. The air that has undergone heat exchange by the indoor heat exchanger 20 is discharged into the room.

[0016] The indoor unit 11 may also be equipped with various sensors for measuring the indoor temperature and the like, an indoor expansion valve, and the like.

[0017] The outdoor unit 12 includes a compressor 30, an accumulator 31, a four-way valve 32, an outdoor expansion valve 33, an outdoor heat exchanger 34, an outdoor fan 35, and an outdoor fan motor 36 as a power device. The compressor 30 is driven by a compressor motor, compresses low-pressure gas refrigerant, and discharges it as high-pressure gas refrigerant. The accumulator 31 separates gas and liquid to prevent liquid from entering the compressor 30.

[0018] The four-way valve 32 is a valve that switches the refrigerant flow path depending on the operating state (operating mode) of the air conditioner 10. The operating modes include cooling mode, heating mode, and fan mode. The outdoor expansion valve 33 is a valve that expands high-pressure refrigerant and adjusts the pressure and flow rate of the refrigerant. The outdoor fan 35 is driven by an outdoor fan motor 36, takes in outdoor air, and sends it to the outdoor heat exchanger 34. Like the indoor heat exchanger 20, the outdoor heat exchanger 34 has heat transfer tubes through which the refrigerant flows, and is configured so that the sent air comes into contact with the surface of the heat transfer tubes to exchange heat. The air that has undergone heat exchange by the outdoor heat exchanger 34 is discharged outdoors.

[0019] The outdoor unit 12 is further equipped with a control device 37. The control device 37 is connected to the compressor 30, the four-way valve 32, the outdoor expansion valve 33, the indoor fan motor 22, and the outdoor fan motor 36 and controls these. Specifically, it controls the rotation speed of the compressor motor, the opening of the outdoor expansion valve 33, and the rotation speeds of the indoor fan motor 22 and the outdoor fan motor 36. To control these, various sensors are also attached to the outdoor unit 12. The control device 37 controls these based on information detected by the various sensors. The control device 37 is not limited to being provided in the outdoor unit 12, but may also be provided in the indoor unit 11, or its functions may be divided into two and provided in the indoor unit 11 and the outdoor unit 12, respectively. Alternatively, the control device 37 may not be mounted inside the indoor unit 11 or the outdoor unit 12 but may be a separate device located separately from the indoor unit 11 or the outdoor unit 12.

[0020] During cooling operation, the indoor heat exchanger 20 is used as an evaporator, and the outdoor heat exchanger 34 is used as a condenser. For this reason, the control device 37 circulates the refrigerant sealed in the system in the following order, as shown by the arrows: compressor 30, four-way valve 32, outdoor heat exchanger 34, outdoor expansion valve 33, indoor heat exchanger 20, four-way valve 32, accumulator 31, and compressor 30.

[0021] The compressor 30 compresses a low-temperature, low-pressure refrigerant (refrigerant gas) in a gaseous state and discharges it as a high-temperature, high-pressure refrigerant gas. The outdoor heat exchanger 34 exchanges heat with outdoor air, cooling and condensing the refrigerant gas. The outdoor expansion valve 33 expands the refrigerant and adjusts the pressure of the refrigerant flowing to the evaporator, and also adjusts the flow rate of the refrigerant to maintain a constant degree of superheat at the evaporator outlet. The degree of superheat indicates how many degrees higher than the saturation temperature, and is an index of the degree of superheat.

[0022] The indoor heat exchanger 20 exchanges heat with the indoor air and returns the refrigerant gas heated to the above-mentioned superheat degree to the outdoor unit 12. The refrigerant gas returned from the indoor heat exchanger 20 is sent to the accumulator 31 through the four-way valve 32 and returned to the compressor 30.

[0023] During heating operation, the process is the opposite of that during cooling operation, with the indoor heat exchanger 20 used as a condenser and the outdoor heat exchanger 34 used as an evaporator, and the refrigerant sealed in the system circulates in the following order: compressor 30, four-way valve 32, indoor heat exchanger 20, outdoor expansion valve 33, outdoor heat exchanger 34, four-way valve 32, accumulator 31, and compressor 30.

[0024] A highly efficient, low-vibration, low-noise rotary compressor, scroll compressor, or the like is used as the compressor 30. Although the compressor 30 may be a rotary compressor, the following description will be given assuming that it is a scroll compressor.

[0025] 2 is a diagram showing an example of the configuration of a scroll compressor used in an air conditioner. Compressor 30 includes a container 40, a compression mechanism 41, a rotating shaft 42, an electric motor 43, a main bearing 44, and an orbiting bearing 45. The scroll compressor also includes an Oldham ring, a balance weight, a power terminal 46, legs 47, etc.

[0026] Container 40 is a sealed container that houses compression mechanism 41, shaft 42, motor 43, etc., and stores lubricating oil at the bottom as oil reservoir 48 to lubricate sliding parts (sliding parts) such as compression mechanism 41, main bearing 44, and slewing bearing 45. Container 40 is composed of a hollow cylindrical chamber, a lid chamber that closes the upper side of the cylindrical chamber, and a bottom chamber that closes the lower side of the cylindrical chamber.

[0027] A suction pipe 49 for sucking in a refrigerant is inserted and fixed into the lid chamber of the container 40. The suction pipe 49 is a pipe that guides the refrigerant to the suction port of the compression mechanism 41. A discharge pipe for discharging the refrigerant is inserted and fixed into the cylindrical chamber of the container 40. The discharge pipe is a pipe that guides the refrigerant compressed by the compression mechanism 41 to the outside of the scroll compressor.

[0028] The compression mechanism 41 is a mechanism that compresses the refrigerant by the rotation of the shaft 42, and includes a fixed scroll 50, an orbiting scroll 51, and a frame 52 as a frame member. The compression mechanism 41 is disposed in the upper space of the container 40, i.e., the space on the lid chamber side.

[0029] The fixed scroll 50 is supported by a frame 52 and has a spiral-shaped fixed wrap 61 in a recess 60 of a predetermined depth formed in a first surface. The fixed scroll 50 has a thick base plate 62 that is circular in plan view, and one circular surface of the base plate 62 is a first surface (end plate surface) 63. When the cover chamber side of the fixed scroll 50 is considered the upper side, the end plate surface 63 is the lower surface (bottom surface) of the base plate 62, and is formed as a region recessed upward from the bottom surface. The fixed wrap 61 has a spiral shape and extends downward in the recess 60, with the tooth tips, which are the tips of the downwardly extending ends, being approximately flush with the end plate surface 63 of the base plate. The base plate 62 is provided with a suction port that is continuous with the suction pipe 49, and refrigerant drawn into the suction pipe 49 is guided to the suction port.

[0030] The orbiting scroll 51 is fitted with the eccentric portion 42a of the shaft 42 and has a spiral-shaped orbiting wrap 70 protruding from the second surface. The orbiting scroll 51 has an end plate 71 that is circular in plan view, one circular surface (end plate surface) of the end plate 71 is the second surface, and the spiral-shaped protrusion protruding from the second surface is the orbiting wrap 70. The end plate 71 is a part that slides against the end plate surface 63 of the fixed scroll 50. The first surface on the outer circumferential direction of the fixed wrap 61 and the second surface on the outer circumferential direction of the orbiting wrap 70 are arranged adjacent to each other.

[0031] The orbiting scroll 51 has a boss portion 72. The boss portion 72 is a cylindrical portion that fits onto the eccentric portion 42a of the shaft 42. The boss portion 72 extends downward from the end plate 71.

[0032] The orbiting wrap 70 extends upward from the end plate 71 and, together with the fixed wrap 61 extending downward from the bottom of the recess 60 in the base plate 62 of the fixed scroll 50, forms a compression chamber that compresses the refrigerant. The compression chamber is a space closed on the front, rear, left, and right sides by the fixed wrap 61 and the orbiting wrap 70, with the upper side closed by the base plate 62 and the lower side closed by the end plate 71, and is formed between the fixed wrap 61 and the orbiting wrap 70 as the fixed wrap 61 and the orbiting wrap 70 mesh with each other. Compression chambers are formed on the inner and outer peripheral sides of the orbiting wrap 70, and the compression chamber formed on the inner peripheral side of the orbiting wrap 70 is the inner compression chamber, and the compression chamber formed on the outer peripheral side of the orbiting wrap 70 is the outer compression chamber.

[0033] A discharge port is provided near the center of the recess 60 in the base plate 62 of the fixed scroll 50. The discharge port is an opening that guides the refrigerant compressed in the compression chamber to the outside of the compression mechanism unit 41, i.e., to the space between the compression mechanism unit 41 and the lid chamber.

[0034] The frame 52 has a generally rotationally symmetrical shape and is fixed to the inner peripheral wall of the cylindrical chamber. The frame 52 has an insertion hole through which the shaft 42 is inserted.

[0035] A back pressure chamber 53 is provided between the orbiting scroll 51 and the frame 52. The refrigerant is compressed by reducing the volume of the compression chamber, which generates a downward force that moves the orbiting scroll 51 away from the fixed scroll 50. This causes refrigerant to leak from the gap between the separated fixed scroll 50 and the orbiting scroll 51. To address this issue, the back pressure chamber 53 is provided, and the pressure in the back pressure chamber 53 pushes the orbiting scroll 51 upward toward the fixed scroll 50. The back pressure chamber 53 is normally maintained at a pressure intermediate between the suction pressure and discharge pressure of the scroll compressor. The back pressure chamber 53 is connected to a groove provided in the end plate surface 63 of the fixed scroll 50 via the outer periphery of the orbiting scroll 51. Hereinafter, this groove and the passage communicating with this groove will be referred to as being included in the back pressure chamber 53.

[0036] Shaft 42 is an axis that rotates integrally with a rotor provided in motor 43 and extends in the vertical direction. Shaft 42 includes a main shaft portion, an eccentric portion 42a extending upward from the main shaft portion, and an oil supply piece 42b installed at the lower end of the main shaft portion. The main shaft portion is fixed coaxially to the rotor of motor 43 and rotates integrally with the rotor. The eccentric portion rotates eccentrically relative to the main shaft portion and is fitted into boss portion 72 of orbiting scroll 51. The eccentric rotation of eccentric portion 42a causes orbiting scroll 51 to orbit.

[0037] Oil supply piece 42b is a centrifugal pump that is at least partially immersed in oil reservoir 48 in container 40 and draws up lubricating oil from oil reservoir 48. Oil supply piece 42b has an opening for drawing in lubricating oil, and supplies the lubricating oil to the sliding parts through through hole 42c provided in shaft 42 by centrifugal force associated with rotation. In addition to the centrifugal force of oil supply piece 42b, the lubricating oil is also drawn up through through hole 42c by the pressure difference between the top and bottom of through hole 42c and supplied to the sliding parts. Through hole 42c communicates with the interior of oil supply piece 42b and branches out to supply lubricating oil to compression mechanism 41, main bearing 44, and orbiting bearing 45.

[0038] The motor 43 is installed between the frame 52 and a subframe 54 that supports the lower side of the shaft 42. The motor 43 has a stator and a rotor. The stator is fixed to the inner circumferential wall of the cylindrical chamber, and the rotor is rotatably disposed radially inside the stator. The shaft 42 is fixed to the rotor so as to be coaxial with its central axis.

[0039] The main bearing 44 rotatably supports the upper part of the main shaft portion relative to the frame 52, and is installed on the peripheral wall surface of the insertion hole of the frame 52. The orbiting bearing 45 rotatably supports the eccentric portion 42a relative to the boss portion 72 of the orbiting scroll 51, and is installed on the inner peripheral surface of the boss portion 72.

[0040] The Oldham ring is a ring-shaped member that receives the eccentric rotation of the eccentric portion 42a and causes the orbiting scroll 51 to orbit without rotating on its axis. The Oldham ring is attached to a groove provided on the underside of the orbiting scroll 51 and a groove provided in the frame 52. The balance weight is a member for suppressing vibration of the scroll compressor, and is installed, for example, above the rotor in the main shaft portion of the shaft 42. Note that this is just one example and is not limiting.

[0041] The sub-frame 54 rotatably supports the lower side of the main shaft, and is fixed to the container 40 while being disposed below the motor 43. The sub-frame 54 has an insertion hole through which the shaft 42 passes, and an auxiliary bearing 55 is installed on the peripheral wall surface of the insertion hole. The auxiliary bearing 55 rotatably supports the lower side of the main shaft relative to the sub-frame 54. The through-hole 42c branches off to supply lubricating oil to the auxiliary bearing 55 as well.

[0042] The power terminal 46 is a terminal for supplying power to the motor 43, and is electrically connected to the motor 43 via a wire. A plurality of legs 47 support the container 40 and are installed in the bottom chamber.

[0043] When the shaft 42 is rotated by the drive of the motor 43, the orbiting scroll 51 fitted to the boss portion 72 of the shaft 42 orbits. As the orbiting scroll 51 orbits, compression chambers are sequentially formed, and refrigerant is taken into the formed compression chambers, compressing the refrigerant as the compression chambers shrink. The compressed refrigerant is discharged into the space above the compression mechanism 41 through the discharge port of the fixed scroll 50. The refrigerant discharged into the space above the compression mechanism 41 is guided to the space below the compression mechanism 41 through the flow path between the compression mechanism 41 and the container 40, and is discharged to the outside of the scroll compressor through the discharge pipe.

[0044] The lubricating oil stored in the oil reservoir 48 of the container 40 flows up from the oil supply piece 42b of the shaft 42 through the through-hole 42c and lubricates sliding parts such as the sub-bearing 55, the main bearing 44, and the orbiting bearing 45. The lubricating oil that reaches the opening at the upper end of the through-hole 42c is led to an oil supply path 73 provided in the orbiting scroll 51.

[0045] 3 is an enlarged view of the compression mechanism 41 shown in FIG. 2. A back pressure chamber 53 is provided between the orbiting scroll 51 and the frame 52. The orbiting scroll 51 has an oil supply passage 73 that supplies lubricating oil pumped up via the through-hole 42c to the end plate surface 63 of the fixed scroll 50. The oil supply passage 73 includes, but is not limited to, a first passage extending upward from the upper end of the shaft 42 (in the thickness direction of the end plate 71 of the orbiting scroll 51), a second passage extending horizontally (in the radial direction of the end plate 71) from one end of the upwardly extending first passage, and a third passage extending upward from one end of the horizontally extending second passage.

[0046] The lubricating oil from the through hole 42 c of the shaft 42 is guided through the oil supply passage 73 of the orbiting scroll 51 to the circumferential groove 64 formed in the end plate surface 63 of the fixed scroll 50 and extending in an arc shape.

[0047] 4 is a diagram illustrating the trajectory of the opening 73a of the oil supply passage 73. The opening 73a of the oil supply passage 73 moves in a circular motion as the orbiting scroll 51 orbits, and passes under the circumferential groove 64 during this movement. The section in which the opening 73a passes under the circumferential groove 64 is indicated by the thick arrow. The opening 73a passes under the circumferential groove 64, then passes under the end plate surface 63, and the opening 73a is closed by the end plate surface 63. These movements are then repeated. In the section in which the opening 73a passes through the circumferential groove 64 and is in communication with the circumferential groove 64, lubricating oil flows from the oil supply passage 73 into the circumferential groove 64.

[0048] FIG. 5 is a view of the fixed scroll and the orbiting scroll as viewed from their joint surface. The fixed scroll 50 shown in FIG. 5(a) has a recess 60 in the center of an end plate surface 63 of a substantially circular base plate 62, and a spiral fixed wrap 61 is provided within the recess 60. A discharge port 65 for discharging refrigerant is provided near the center of the recess 60 at one end of the fixed wrap 61, and a suction port 66 for drawing refrigerant is provided on the outer periphery of the recess 60 at the other end of the fixed wrap 61. In addition, a circumferential groove 64 is provided in the end plate surface 63 of the fixed scroll 50. High-pressure lubricating oil is intermittently supplied to the circumferential groove 64 via an oil supply path 73 of the orbiting scroll 51. The circumferential groove 64 has an arc portion 64a extending in an arc shape and a communication portion 64b that communicates with the opening 73a. In addition, the circumferential groove 64 does not communicate with the suction port 66 because if the high-pressure lubricating oil supplied through the oil supply path 73 flows into the suction side of the low-pressure refrigerant, the lubricating oil will not be able to be properly supplied to each sliding part.

[0049] The arc portion 64a is formed such that, for example, the center of the arc is near the center of the fixed scroll 50 when viewed from below (e.g., the center of the discharge port 65), and the central angle (the angle formed by a line connecting the boundary between the arc portion 64a and the communicating portion 64b, one end of which is the boundary between the arc portion 64a and the communicating portion 64b, and a line connecting the center of the arc and the other end of the arc portion 64a) is within a range of 30° to 240°. A portion of the arc portion 64a may be formed to overlap a predetermined biased load region. Here, the biased load region is a region where the end plate surface 74 of the orbiting scroll 51 strongly hits the end plate surface 63 of the fixed scroll 50 when a force (a resultant force of a centrifugal force and a gas load) acts to tilt the orbiting scroll 51 relative to the end plate surface 63 of the fixed scroll 50. 5(a), a force acts to separate the orbiting scroll 51 from the fixed scroll 50 by intermittently supplying high-pressure lubricating oil to the circumferential groove 64 including the arc portion 64a, which appropriately reduces the thrust load between the orbiting scroll 51 and the fixed scroll 50, thereby suppressing friction loss and seizure at the sliding portion. The thrust load is a load applied in the axial direction of the shaft 42.

[0050] The orbiting scroll 51 shown in FIG. 5(b) has an orbiting wrap 70 that protrudes in a spiral shape from a substantially circular end plate surface 74. The end plate surface 74 of the orbiting scroll 51 has an opening 73a of an oil supply path 73, as well as a first oil drain groove 75, a second oil drain groove 76, and an oil supply hole 77. The first oil drain groove 75 communicates with the back pressure chamber 53 and supplies lubricating oil to the back pressure chamber 53. The back pressure chamber 53 is formed between the orbiting scroll 51 and a frame 52 fixed to the container 40, so that lubricating oil is supplied to the sliding portion between the orbiting scroll 51 and the frame 52.

[0051] The second oil drain groove 76 communicates with the compression chamber (external compression chamber) on the outer periphery of the orbiting scroll 51 and supplies lubricating oil to the external compression chamber. The external compression chamber is formed between the orbiting wrap 70 of the orbiting scroll 51 and the fixed wrap 61 of the fixed scroll 50 supported by the frame 52, and supplies lubricating oil to the area where the orbiting wrap 70 and the fixed wrap 61 slide, the area where the tooth tip of the orbiting wrap 70 slides against the bottom surface of the recess 60 of the fixed scroll 50, and the area where the tooth tip of the fixed wrap 61 slides against the end plate surface 74 of the orbiting wrap 70.

[0052] Oil feed hole 77 is a hole connecting two openings provided in end plate surface 74, with orbiting wrap 70 located at the outermost spiral position sandwiched between them. One opening of oil feed hole 77 is provided on the outer periphery of orbiting wrap 70, and the other opening is provided on the inner periphery of orbiting wrap 70, adjacent to orbiting wrap 70. As a result, when one opening of oil feed hole 77 is located below circumferential groove 64, it becomes possible to supply lubricating oil from the other opening via oil feed hole 77 to a compression chamber (internal compression chamber) formed on the inner periphery of orbiting wrap 70.

[0053] In addition, the first oil drain groove 75, the second oil drain groove 76, and the oil supply hole 77 are intermittently connected to the circumferential groove 64 as the orbiting scroll 51 rotates, so that lubricating oil is also intermittently supplied to the back pressure chamber 53, the outer compression chamber, and the inner compression chamber.

[0054] FIG. 6 is a diagram showing the communication states of the first oil drain groove 75, the second oil drain groove 76, and the oil supply hole 77. FIG. 6(a) is a diagram showing the communication state between the first oil drain groove 75 and the back pressure chamber 53, as indicated by the dashed line. As the orbiting scroll 51 orbits, the first oil drain groove 75 intermittently communicates with the back pressure chamber 53 located on the outer periphery thereof. The lubricating oil supplied to the circumferential groove 64 of the fixed scroll 50 flows into the first oil drain groove 75 while the first oil drain groove 75 and the circumferential groove 64 are in communication. Thereafter, when the first oil drain groove 75 communicates with the back pressure chamber 53, the lubricating oil that has flowed into the first oil drain groove 75 flows into the back pressure chamber 53. Since the first oil drain groove 75 is intermittently in communication with the back pressure chamber 53, the lubricating oil can be supplied from the first oil drain groove 75 to the back pressure chamber 53 intermittently.

[0055] FIG. 6( b ) shows a state in which the second oil drain groove 76 and the external compression chamber 80 are in communication. As the orbiting scroll 51 orbits, the second oil drain groove 76 intermittently communicates with the external compression chamber 80, which is a compression chamber on the outer periphery of the orbiting scroll 51. The lubricating oil supplied to the circumferential groove 64 of the fixed scroll 50 flows into the second oil drain groove 76 while the second oil drain groove 76 and the circumferential groove 64 are in communication. Thereafter, when the second oil drain groove 76 communicates with the external compression chamber 80, the lubricating oil that has flowed into the second oil drain groove 76 flows into the external compression chamber 80. Because the second oil drain groove 76 is in intermittent communication with the external compression chamber 80, the lubricating oil can be intermittently supplied from the second oil drain groove 76 to the external compression chamber 80.

[0056] 6(c) is a diagram showing a state in which the oil feed hole 77 and the internal compression chamber 81 are in communication. As the orbiting scroll 51 orbits, the oil feed hole 77 intermittently communicates with the internal compression chamber 81, which is a compression chamber on the inner periphery of the orbiting scroll 51. In FIG. 6(c), the oil feed hole 77 is shown as two independent openings, but the oil feed hole 77 is actually a single hole in which these two openings are connected through the end plate 71 of the orbiting scroll 51.

[0057] The lubricating oil supplied to the circumferential groove 64 of the fixed scroll 50 flows into the oil feed hole 77 while the oil feed hole 77 and the circumferential groove 64 are in communication with each other. Thereafter, when the oil feed hole 77 is in communication with the internal compression chamber 81, the lubricating oil that has flowed into the oil feed hole 77 flows into the internal compression chamber 81. Because the oil feed hole 77 is in intermittent communication with the internal compression chamber 81, the lubricating oil can be intermittently supplied from the oil feed hole 77 to the internal compression chamber 81.

[0058] In this way, by using the first oil drain groove 75, the second oil drain groove 76, and the oil supply hole 77 provided in the orbiting scroll 51, it is possible to establish independent oil supply routes from the circumferential groove 64 of the fixed scroll 50 to each of the back pressure chamber 53, the outer compression chamber 80, and the inner compression chamber 81. Therefore, the first oil drain groove 75, the second oil drain groove 76, and the oil supply hole 77 are connected to each of the back pressure chamber 53, the outer compression chamber 80, and the inner compression chamber 81, respectively, so that lubricating oil can be stably supplied to each of the back pressure chamber 53, the outer compression chamber 80, and the inner compression chamber 81.

[0059] Furthermore, by intermittently communicating the back pressure chamber 53, the external line compression chamber 80, and the internal line compression chamber 81, excessive oil supply can be suppressed, thereby reducing the amount of oil leakage. Here, oil leakage refers to lubricating oil being discharged from the scroll compressor along with the refrigerant. An increase in the amount of oil leakage means that the amount of lubricating oil supplied to each sliding part decreases, potentially making it impossible to supply a sufficient amount of lubricating oil, which reduces the reliability of the compressor and makes it difficult to ensure high performance. However, by adopting the above-described configuration in which the back pressure chamber 53, the external line compression chamber 80, and the internal line compression chamber 81 are intermittently communicated, the amount of oil leakage can be suppressed, allowing a sufficient amount of lubricating oil to be supplied, thereby ensuring high reliability and high performance of the compressor.

[0060] In addition, by adjusting the shape and position of the circumferential groove 64 of the fixed scroll 50, the first oil drain groove 75, the second oil drain groove 76, and the oil supply hole 77 of the orbiting scroll 51, the timing and amount of oil supply to the back pressure chamber 53, the outer compression chamber 80, and the inner compression chamber 81 can be set as desired.

[0061] 7 is a diagram showing the transition of the communication state between the first oil drain groove 75, the second oil drain groove 76, and the oil supply hole 77 and the back pressure chamber 53, the external compression chamber 80, and the internal compression chamber 81. Broadly speaking, the communication state transitions at four timings during the orbiting of the orbiting scroll 51. The communication state transitions in the order of first timing, second timing, third timing, and fourth timing, and then the transition is repeated again from the first timing.

[0062] 7(a) shows the communication state at a first timing. The state shown in FIG. 7(a) is the state immediately before refrigerant compression begins in the external compression chamber 80. That is, the refrigerant is sucked from the suction port toward the outer periphery of the orbiting scroll 51, and the orbiting wrap 70 on the outermost side of the orbiting scroll 51 is adjacent to the inner wall surface of the recess 60 of the fixed scroll 50, and the external compression chamber 80 is formed. At the first timing, none of the first oil drain groove 75, the second oil drain groove 76, or the oil supply hole 77 communicates with the back pressure chamber 53, the external compression chamber 80, or the internal compression chamber 81.

[0063] FIG. 7(b) shows the communication state at the second timing. The state shown in FIG. 7(b) is the state immediately after refrigerant compression begins in the external compression chamber 80. That is, the refrigerant is drawn into the outer periphery of the orbiting scroll 51 through the suction port 66. The outermost orbiting wrap 70 of the orbiting scroll 51 is positioned adjacent to the inner wall surface of the recess 60 of the fixed scroll 50 to form the external compression chamber 80. This is the state immediately after communication between the refrigerant and the suction port 66 is terminated. At the second timing, the second oil drain groove 76 communicates with the external compression chamber 80, while the first oil drain groove 75 and the oil supply hole 77 do not communicate with the back pressure chamber 53 or the internal compression chamber 81. Therefore, the lubricating oil introduced into the circumferential groove 64 is supplied only to the external compression chamber 80.

[0064] 7(c) is a diagram showing the communication state at the third timing. The state shown in FIG. 7(c) is a state in which the oil supply hole 77 of the orbiting scroll 51 communicates with the internal compression chamber 81 after the state shown in FIG. 7(b). At the third timing, the oil supply hole 77 and the internal compression chamber 81 are in communication, the first oil drain groove 75 and the second oil drain groove 76 do not communicate with the back pressure chamber 53 and the external compression chamber 80, and the lubricating oil introduced into the circumferential groove 64 is supplied only to the internal compression chamber 81.

[0065] 7(d) is a diagram showing the communication state at the fourth timing. The state shown in FIG. 7(d) is a state in which the first oil drain groove 75 of the orbiting scroll 51 communicates with the back pressure chamber 53 after the state shown in FIG. 7(c). At the fourth timing, the first oil drain groove 75 and the back pressure chamber 53 are in communication, the second oil drain groove 76 and the oil supply hole 77 do not communicate with the outer compression chamber 80 and the inner compression chamber 81, and the lubricating oil introduced into the circumferential groove 64 is supplied only to the back pressure chamber 53.

[0066] 7(d), the state returns to the state shown in Fig. 7(a), and the states at each timing are repeated. In this way, during one rotation of the orbiting scroll 51, the timing at which the first oil drain groove 75, the second oil drain groove 76, and the oil feed hole 77 of the orbiting scroll 51 communicate with the back pressure chamber 53, the outer compression chamber 80, and the inner compression chamber 81 is shifted, and while one of the first oil drain groove 75, the second oil drain groove 76, and the oil feed hole 77 is in communication, the other two are not in communication. This prevents uneven oil supply depending on the space to which oil is supplied, and makes it possible to reliably supply lubricating oil introduced into the circumferential groove 64 of the fixed scroll 50 to the desired space.

[0067] The scroll compressor and refrigeration cycle device of the present invention have been described in detail using the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments and can be modified within the scope of what a person skilled in the art can conceive, such as other embodiments, additions, changes, deletions, etc., and any aspect is included in the scope of the present invention as long as it achieves the functions and effects of the present invention.

[0068] Therefore, according to the present invention, there is provided (1) a scroll compressor including: a container for storing lubricating oil; an electric motor accommodated in the container; a rotating shaft rotated by the electric motor and having a through hole and an eccentric portion through which the lubricating oil flows; a frame member having an insertion hole through which the rotating shaft passes; a fixed scroll having a first surface and a spiral fixed wrap in a recess formed in the first surface and supported by the frame member; and an orbiting scroll having a second surface and a spiral orbiting wrap protruding from the second surface, which engages with the eccentric portion of the rotating shaft and forms a compression chamber for compressing a refrigerant between the fixed wrap and the orbiting wrap, wherein the fixed scroll has a circumferential groove extending in an arc shape on the first surface, and the orbiting scroll has an oil supply path for supplying the lubricating oil from the through hole to the first surface, and an oil supply hole on the second surface that intermittently communicates with a compression chamber formed on the inner peripheral side of the orbiting wrap.

[0069] According to the present invention, (2) there is provided a scroll compressor as described in (1) above, which includes a back pressure chamber between the orbiting scroll and the frame member, and the orbiting scroll has a first oil drain groove in the second surface that intermittently communicates with the back pressure chamber.

[0070] According to the present invention, (3) there is provided a scroll compressor as described in (1) above, in which the orbiting scroll has a second oil drain groove on the second surface that intermittently communicates with a compression chamber formed on the outer periphery of the orbiting wrap.

[0071] According to the present invention, (4) there is provided a scroll compressor as described in (1) above, which includes a back pressure chamber between the orbiting scroll and the frame member, and the orbiting scroll has, on the second surface, a first oil drain groove that intermittently communicates with the back pressure chamber and a second oil drain groove that intermittently communicates with a compression chamber formed on the outer periphery of the orbiting wrap.

[0072] According to the present invention, there is provided the scroll compressor described in (5) above (4), wherein (i) the second oil drain groove communicates with the compression chamber formed on the outer periphery of the orbiting wrap immediately after compression of the refrigerant begins in the compression chamber formed on the outer periphery of the orbiting wrap, (ii) the oil feed hole communicates with the compression chamber formed on the inner periphery of the orbiting wrap after communication between the second oil drain groove and the compression chamber formed on the outer periphery of the orbiting wrap ends, and (iii) the first oil drain groove communicates with the back pressure chamber after communication between the oil feed hole and the compression chamber formed on the inner periphery of the orbiting wrap ends. Note that when the scroll compressor includes a first oil drain groove and an oil feed hole but does not include a second oil drain hole, the first oil drain groove can be communicated with the compression chamber and the back pressure chamber formed on the inner periphery of the orbiting wrap in the order of (ii) and (iii). In addition, when a second oil drain groove and an oil supply hole are provided but a first oil drain hole is not provided, the compression chamber formed on the outer periphery of the orbiting wrap and the compression chamber formed on the inner periphery of the orbiting wrap can be connected in the order of (i) and (ii).

[0073] According to the present invention, (6) the fixed scroll has a suction port for drawing the refrigerant, There is provided the scroll compressor according to any one of the above (1) to (5), wherein the circumferential groove does not communicate with the suction port.

[0074] Furthermore, according to the present invention, it is possible to provide a refrigeration cycle device that includes a scroll compressor that circulates a refrigerant and exchanges heat with the circulating refrigerant to cool or heat a fluid, and the refrigeration cycle device can include the scroll compressor described in any one of (1) to (6) above. [Explanation of symbols]

[0075] 10...Air conditioning equipment 11...Indoor unit 12...Outdoor unit 20…Indoor heat exchanger 21...Indoor fan 22...Indoor fan motor 30...Compressor 31...Accumulator 32...Four-way valve 33...Outdoor expansion valve 34…Outdoor heat exchanger 35...Outdoor fan 36...Outdoor fan motor 37...Control device 40…Container 41...Compression mechanism 42...Shaft 42a...Eccentric part 42b...Fueling piece 42c...Through hole 43...Motor 44...Main bearing 45...Slewing bearing 46…Power terminal 47...legs 48...Oil pool 49...Suction pipe 50...Fixed scrolling 51...Rotating scroll 52...Frame 53...Back pressure chamber 54...Subframe 55...Sub bearing 60...recess 61...Fixed wrap 62...Base plate 63...Mirror plate 64...Circumferential groove 64a...Arc section 64b...Communication part 65...Discharge port 66...Intake port 70...Turning lap 71...head panel 72...Boss section 73...Fueling route 73a…Aperture 74...Mirror surface 75...First oil drain groove 76...Second oil drain groove 77...Fuel filler hole 80...External Line Compression Room 81... Internal line compression room

Claims

1. a container in which lubricating oil is stored; an electric motor housed within the container; a rotating shaft that is rotated by the electric motor and has a through hole through which the lubricating oil flows and an eccentric portion; a frame member having an insertion hole through which the rotating shaft is inserted; a fixed scroll having a first surface and a spiral-shaped fixed wrap within a recess formed in the first surface, the fixed scroll being supported by the frame member; an orbiting scroll including a second surface and a spiral orbiting wrap protruding from the second surface, the orbiting scroll being fitted to the eccentric portion of the rotary shaft and forming a compression chamber for compressing a refrigerant between the fixed wrap and the orbiting wrap; Including, the fixed scroll has a circumferential groove extending in an arc shape on the first surface, the orbiting scroll has an oil supply path that supplies the lubricating oil from the through hole to the first surface, and an oil supply hole in the second surface that intermittently communicates with a compression chamber formed on the inner side of the orbiting wrap.

2. a back pressure chamber is provided between the orbiting scroll and the frame member; 2. The scroll compressor according to claim 1, wherein the orbiting scroll has, on the second surface thereof, a first oil drain groove intermittently communicating with the back pressure chamber.

3. 2. The scroll compressor according to claim 1, wherein the orbiting scroll has, on the second surface thereof, a second oil drain groove intermittently communicating with a compression chamber formed on the outer circumferential side of the orbiting wrap.

4. a back pressure chamber is provided between the orbiting scroll and the frame member; 2. The scroll compressor according to claim 1, wherein the orbiting scroll has, on the second surface thereof, a first oil drain groove intermittently communicating with the back pressure chamber and a second oil drain groove intermittently communicating with a compression chamber formed on the outer circumferential side of the orbiting wrap.

5. the second oil drain groove communicates with the compression chamber formed on the outer circumferential side of the orbiting wrap immediately after compression of the refrigerant begins in the compression chamber formed on the outer circumferential side of the orbiting wrap, the oil supply hole communicates with a compression chamber formed on an inner peripheral side of the orbiting wrap after communication between the second oil drain groove and a compression chamber formed on an outer peripheral side of the orbiting wrap is completed, 5. The scroll compressor according to claim 4, wherein the first oil discharge groove communicates with the back pressure chamber after communication between the oil supply hole and a compression chamber formed on the inner circumferential side of the orbiting wrap is terminated.

6. The fixed scroll has a suction port for drawing the refrigerant, The scroll compressor according to any one of claims 1 to 5, wherein the circumferential groove does not communicate with the suction port.

7. A refrigeration cycle device that includes a scroll compressor that circulates a refrigerant and exchanges heat with the circulating refrigerant to cool or heat a fluid, The scroll compressor is a container in which lubricating oil is stored; an electric motor housed within the container; a rotating shaft that is rotated by the electric motor and has a through hole through which the lubricating oil flows and an eccentric portion; a frame member having an insertion hole through which the rotating shaft is inserted; a fixed scroll having a first surface and a spiral-shaped fixed wrap within a recess formed in the first surface, the fixed scroll being supported by the frame member; an orbiting scroll including a second surface and a spiral orbiting wrap protruding from the second surface, the orbiting scroll being fitted to the eccentric portion of the rotary shaft and forming a compression chamber for compressing a refrigerant between the fixed wrap and the orbiting wrap; Including, the fixed scroll has a circumferential groove extending in an arc shape on the first surface, The orbiting scroll has an oil supply path that supplies the lubricating oil from the through hole to the first surface, and an oil supply hole in the second surface that intermittently communicates with a compression chamber formed on the inner side of the orbiting wrap.

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