Scroll compressor

Abstract

A rotary shaft 13 has a first oil passage for guiding a lubricating oil stored in an oil reservoir part 4 to a boss housing part 32 via an eccentric shaft part 13b, and a second oil passage for guiding the lubricating oil to the boss housing part 32 via a main shaft part 13a. A third oil passage 41 for discharging the oil stored in the boss housing part 32 to a bottom part of an upper balancer 13h is provided in the rotary shaft 13, the upper balancer 13h, or both. A rotor 23 has, therein, a fourth oil passage 42 penetrating an upper end and a lower end in the axial direction. An oil guide plate 43 is provided between the upper balancer 13h and the rotor 23. The third oil passage 41 and the fourth oil passage 42 are communicated by the oil guide plate 43. The present invention provides a scroll compressor 101 in which it is possible to realize a reduction in the amount of oil discharged to the outside of the scroll compressor 101 by suppressing the amount of oil discharged to the outside of the scroll compressor 101 after lubricating a main bearing 30, while securing ease of assembly when the oil passage 41 is assembled.

Description

Scroll Compressor

[0001] The present disclosure relates to a scroll compressor used in particular in an air conditioner, a water heater, or a refrigeration machine such as a refrigerator.

[0002] (Knowledge, etc., that Forms the Basis of the Present Disclosure) Conventionally, as described in, for example, Patent Document 1, there has been a scroll compressor having a vertically extending rotating shaft and storing lubricating oil (refrigeration oil) in the bottom portion of a sealed container. In this scroll compressor, an oil pump is provided below the rotating shaft, and lubricating oil is sent from the lower end of the rotating shaft to the upper portion of the rotating shaft via an oil supply path that extends vertically inside the rotating shaft. The lubricating oil sent upward is supplied to the periphery of an upper bearing to lubricate the periphery. The lubricating oil that has lubricated the upper bearing is returned to the lower oil storage area via an oil return path connected to the main bearing. This scroll compressor is provided with an oil return flow path that connects the boss housing portion to the lower oil reservoir portion via the outer periphery of the stator. Therefore, the lubricating oil passing from the upper portion to the lower portion of the oil return flow path does not leak from the oil return flow path between the boss housing portion and the lower oil reservoir portion, preventing the lubricating oil from being entrained by the refrigerant discharged from the scroll compressor.

[0003] JP 2015-86829 A

[0004] In the scroll compressor disclosed in Patent Document 1, oil that has passed through the bearing oil supply horizontal hole and lubricated the main bearing is discharged from below the main bearing and may be discharged from the discharge pipe along with the refrigerant discharged from the scroll compressor to the outside of the scroll compressor. Therefore, there is a concern that the amount of oil discharged to the outside of the scroll compressor may be large. Furthermore, the configuration of Patent Document 1 is concerned about poor productivity. Because the oil return path is connected to the main bearing, for example, when the main bearing and the stator are fixed to the sealed container in that order, the oil return path must be routed around the outer periphery of the stator inside the sealed container while one of them is fixed to the sealed container. Therefore, there is a concern that production time will be long and production costs will be high.

[0005] Therefore, the present disclosure provides a scroll compressor that ensures ease of assembly when assembling the oil path, while reducing the amount of oil discharged outside the scroll compressor after lubricating the main bearings.

[0006] In the scroll compressor of the present disclosure, an oil groove is provided in the rotating shaft or the main bearing, and oil that has lubricated the eccentric shaft and the main bearing is collected in the boss housing. The collected oil is then guided to the bottom of the rotor through oil paths provided in the rotating shaft, upper balancer, oil guide plate, and rotor.

[0007] The scroll compressor of the present disclosure has an oil groove in the rotating shaft or the main bearing, collects oil in the boss housing after lubricating the eccentric shaft and main bearing, and discharges the collected oil to the bottom of the rotor. This reduces the amount of oil discharged outside the scroll compressor after lubricating the main bearing, compared to Patent Document 1. Furthermore, the scroll compressor of the present disclosure uses parts that are not fixed to the sealed container to form the oil path from the boss housing to the bottom of the rotor, allowing the oil path to be assembled without the parts being fixed to the sealed container. This is expected to improve assembly ease compared to Patent Document 1.

[0008] FIG. 1 is a longitudinal sectional view of a scroll compressor according to a first embodiment. FIG. 2 is a detailed view of the direction of rotation of the rotary shaft and the shape of the spiral groove according to the first embodiment. FIG. 3 is a view showing the height relationship between the oil groove and the main bearing according to the first embodiment. FIG. 4 is a detailed view of a third oil path according to the first embodiment. FIG. 5 is a detailed view of an oil guide plate according to the first embodiment. FIG. 6 is a view showing the positional relationship between the oil guide plate and the magnet according to the second embodiment. FIG. 7 is a longitudinal sectional view of a scroll compressor according to a third embodiment. FIG. 8 is a longitudinal sectional view of a scroll compressor according to a fourth embodiment.

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed description of already well-known matters or redundant description of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. Note that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0010] (First Embodiment) Hereinafter, a first embodiment will be described with reference to Figs. 1 to 5. [1-1. Configuration]

[0011] As shown in FIG. 1, the scroll compressor 101 is configured by disposing a compression mechanism 10 that compresses a refrigerant and an electric mechanism 20 that drives the compression mechanism 10 within a sealed container 1.

[0012] The sealed container 1 is composed of a body 1a formed in a cylindrical shape extending in the vertical direction, a lower lid 1b that closes the lower opening of the body 1a, and an upper lid 1c that closes the upper opening of the body 1a. The sealed container 1 is provided with a refrigerant suction pipe 2 that introduces refrigerant into the compression mechanism 10, and a refrigerant discharge pipe 3 that discharges refrigerant compressed by the compression mechanism 10 to the outside of the sealed container 1. The electric mechanism 20 includes a stator 22 fixed to the sealed container 1 and a rotor 23 arranged inside the stator 22. A rotating shaft 13 is fixed to the rotor 23. The compression mechanism 10 has a fixed scroll 11, an orbiting scroll 12, and the rotating shaft 13 that drives the orbiting scroll 12 to orbit.

[0013] The rotating shaft 13 is formed with a main shaft portion 13a and an eccentric shaft portion 13b that is eccentric with respect to the rotating shaft 13, and the distance between the center line of the rotating shaft 13 and the center line of the eccentric shaft portion 13b is defined as the orbiting radius. Below the fixed scroll 11 and the orbiting scroll 12, a main bearing 30 that supports the fixed scroll 11 and the orbiting scroll 12 is provided.

[0014] An upper balancer 13h and a lower balancer 13k are provided on the rotating shaft 13 to achieve static and dynamic balance with the orbiting scroll 12 when the rotating shaft 13 rotates. The upper balancer 13h is disposed between the main bearing 30 and the rotor 23, and the lower balancer 13k is disposed between the rotor 23 and the auxiliary bearing 18. The upper balancer 13h and the lower balancer 13k may be fixed to the rotating shaft 13 by press fitting, shrink fitting, or the like, or may be fixed to the rotor 23 with rivets 44 or the like.

[0015] The main bearing 30 includes a bearing portion 31 that supports the rotary shaft 13, and a boss accommodating portion 32. The main bearing 30 is fixed to the sealed container 1 by welding, shrink fitting, or the like.

[0016] The fixed scroll 11 includes a disk-shaped fixed scroll end plate 11a, a spiral-shaped fixed spiral wrap 11b extending from the fixed scroll end plate 11a, and an outer peripheral wall portion 11c extending to surround the fixed spiral wrap 11b. A discharge port 14 is formed approximately at the center of the fixed scroll end plate 11a. The orbiting scroll 12 includes a disk-shaped orbiting scroll end plate 12a, an orbiting spiral wrap 12b extending from one surface (the wrap-side end surface) of the orbiting scroll end plate 12a, and a cylindrical boss portion 12c formed on the other surface (the anti-wrap-side end surface) of the orbiting scroll end plate 12a. The other surface of the orbiting scroll end plate 12a is the surface opposite the wrap-side end surface of the orbiting scroll end plate 12a. An orbiting bearing 12d is fitted into the cylindrical boss portion 12c. The wrap side of the orbiting bearing 12d is closed by the orbiting scroll end plate 12a, and the anti-wrap side is open. The eccentric shaft portion 13b of the rotary shaft 13 is inserted into the open side of the orbiting bearing 12d.

[0017] The fixed spiral wrap 11b of the fixed scroll 11 and the orbiting spiral wrap 12b of the orbiting scroll 12 are meshed with each other, and a plurality of compression chambers 15 are formed between the fixed spiral wrap 11b and the orbiting spiral wrap 12b. The boss portion 12c is formed approximately in the center of the orbiting scroll end plate 12a. The boss portion 12c is housed in the boss housing portion 32 with the orbiting bearing 12d inserted into the boss portion 12c. The fixed scroll 11 is fixed to the main bearing 30 at the outer peripheral wall portion 11c using a plurality of bolts (not shown).

[0018] An oil reservoir 4 for storing lubricating oil is formed at the inner bottom of the sealed container 1. The lower end 13c of the rotating shaft 13 is journaled on a sub-bearing 18 located at the bottom of the sealed container 1. A positive displacement oil pump 5 is provided at the lower end of the rotating shaft 13. The oil pump 5 is positioned so that its suction port is located within the oil reservoir 4. The rotating shaft 13 is formed with a rotating shaft oil supply vertical hole 13d extending from the lower end 13c of the rotating shaft 13 to the eccentric shaft portion 13b. An oil groove 13e is formed in the outer peripheral surface of the main shaft portion 13a, and an oil groove 13f is formed in the outer peripheral surface of the eccentric shaft portion 13b. Although the oil grooves 13e and 13f may be spiral grooves or D-cuts, in this embodiment they are spiral grooves. As shown in FIG. 2, the oil groove 13e is oriented so that oil supplied from the horizontal oil supply hole 13j bends in the opposite direction to the rotation of the rotating shaft 13. 3 , the lowest end 50 of the oil groove 13e is located above the lowest end 51 of the main bearing 30. In this case, the lowest end 50 of the oil groove 13e is the lowest end including the chamfer of the oil groove 13e, and the lowest end 51 of the main bearing 30 is the lowest end not including the chamfer of the main bearing 30.

[0019] Furthermore, the rotating shaft 13 or the upper balancer 13h, or both, are provided with a third oil passage 41 that discharges oil stored in the boss accommodating portion 32 to the bottom of the upper balancer 13h. In this embodiment, the third oil passage 41 is made up of a rotating shaft portion passage 41a provided in the rotating shaft 13 and an upper balancer portion passage 41b provided in the upper balancer 13h, but the third oil passage 41 may be provided only in the rotating shaft 13.

[0020] In this embodiment, as shown in Figure 4, the rotating shaft section passage 41a is provided in the connection portion 13i between the main shaft portion 13a of the rotating shaft 13 and the upper balancer 13h of the rotating shaft 13, and the upper balancer section passage 41b forms the third oil passage 41 by cutting out a portion of the inner diameter of the upper balancer 13h.

[0021] 1, a fourth oil path 42 is provided inside the rotor 23, penetrating the upper and lower ends in the axial direction, and an oil guide plate 43 is provided between the upper balancer 13h and the rotor 23, with the third oil path 41 and the fourth oil path 42 communicating with each other through the oil guide plate 43. FIG. 5 shows a detailed view of the oil guide plate 43. The oil guide plate 43 is configured to be in contact with the upper balancer 13h and the rotor 23. The contact surface between the oil guide plate 43 and the upper balancer 13h is indicated by 43a, and the contact surface between the oil guide plate 43 and the rotor 23 is indicated by 43b. The rotor 23 and the oil guide plate 43 may also be fixed with rivets 44. [1-2. Operation]

[0022] The operation and function of the scroll compressor 101 configured as described above will be described below. When the electric motor mechanism 20 is energized, the rotor 23 rotates together with the rotating shaft 13 due to the magnetic field generated in the stator 22. The rotation of the rotating shaft 13 drives the oil pump 5. The oil pump 5 reliably pumps lubricating oil from the oil reservoir 4 located at the bottom of the sealed container 1 to the sliding parts of the scroll compressor 101 regardless of pressure conditions. The oil pumped by the oil pump 5 passes through the rotating shaft oil supply vertical hole 13d formed in the rotating shaft 13, passes through the bearing of the auxiliary bearing 18, and is supplied to the boss 12c. The first oil path guides the lubricating oil stored in the oil reservoir 4 through the rotating shaft oil supply vertical hole 13d, passes through the eccentric shaft 13b, and then to the boss accommodating part 32. Oil reaching the high-pressure region (H) surrounded by the boss portion 12c, the anti-wrap side surface of the orbiting scroll end plate 12a, and the upper end surface of the eccentric shaft portion 13b lubricates the eccentric shaft portion 13b through the oil groove 13f formed in the outer peripheral surface of the eccentric shaft portion 13b before being supplied to the boss accommodating portion 32. Furthermore, the lubricating oil stored in the oil reservoir 4 is supplied to the boss accommodating portion 32 through the oil groove 13e formed in the outer peripheral surface of the main shaft portion 13a of the rotating shaft 13 after lubricating the main bearing 30. As shown in FIG. 2 , in this embodiment, the oil groove 13e is spiral-shaped, and the oil is pressed against the side wall of the spiral groove by the rotation of the rotating shaft 13, making it easier to supply to the boss accommodating portion 32. The second oil path is a path that guides the lubricating oil stored in the oil reservoir 4 through the rotating shaft oil supply vertical hole 13d and via the main shaft portion 13a to the boss accommodating portion 32. 3, the bottom end 50 of the oil groove 13e is positioned above the bottom end 51 of the main bearing 30, so that oil that has lubricated the main bearing 30 is prevented from leaking from below the main bearing 30 and is supplied to the boss accommodating portion 32. A seal member 33 is provided on the outer periphery of the boss accommodating portion 32, so that the interior of the boss accommodating portion 32 is under high pressure. The oil supplied to the boss accommodating portion 32 passes through the rotating shaft portion path 41a and the upper balancer portion path 41b of the third oil path 41, in that order, and is then discharged to the bottom of the upper balancer 13h.Furthermore, the oil discharged to the bottom of the upper balancer 13h is guided by an oil guide plate 43 to a third oil path 41 that passes through the inside of the rotor 23. The oil that passes through the third oil path 41 is guided to the bottom of the rotor 23.

[0023] Furthermore, as the rotating shaft 13 rotates, the eccentric shaft portion 13b rotates eccentrically relative to the main shaft portion 13a, causing the orbiting scroll 12 to orbit. At this time, the movement of the orbiting scroll 12 relative to the fixed scroll 11 is restricted by the Oldham ring 17. As a result, as the eccentric shaft portion 13b of the rotating shaft 13 rotates by crank, the orbiting scroll 12 orbits relative to the fixed scroll 11 without rotating on its own axis.

[0024] Refrigerant drawn into the refrigerant suction pipe 2 is guided from the suction port 15a into the compression chamber 15. The compression chamber 15 moves from the outer periphery toward the center while reducing its volume. When the refrigerant reaches a predetermined pressure in the compression chamber 15, it is discharged into the discharge chamber 6 from the discharge port 14 provided in the center of the fixed scroll 11. A discharge reed valve (not shown) is provided in the discharge port 14. When the refrigerant reaches a predetermined pressure in the compression chamber 15, it pushes open the discharge reed valve, and the refrigerant is discharged into the discharge chamber 6. The refrigerant discharged into the discharge chamber 6 is led into the sealed container 1 and discharged from the refrigerant discharge pipe 3. [1-3. Effects]

[0025] The bottom end 50 of the oil groove 13e is located above the bottom end 51 of the main bearing 30, and is provided with a spiral groove as shown in Figure 2. Therefore, the oil that has lubricated the main bearing 30 can be guided to the boss accommodating portion 32 while suppressing leakage from the bottom end of the main bearing 30. This makes it possible to reduce the amount of oil discharged outside the scroll compressor 101.

[0026] Furthermore, oil supplied to the boss accommodating portion 32 is discharged to the bottom of the upper balancer 13h via the third oil path 41. The oil discharged to the bottom of the upper balancer 13h passes through the fourth oil path 42 via the oil guide plate 43, is discharged to the bottom of the rotor 23, and is returned to the oil reservoir 4. This prevents the oil from being entrained in the refrigerant discharged from the space above the electric mechanism 20 and being discharged simultaneously with the refrigerant, thereby reducing the amount of oil discharged to the outside of the scroll compressor 101. Furthermore, the upper balancer 13h and the oil guide plate 43, and the oil guide plate 43 and the rotor 23, are in contact with each other, thereby communicating the third oil path 41 without any gaps. This prevents oil from leaking from the gap between the upper balancer 13h and the oil guide plate 43 or the gap between the oil guide plate 43 and the rotor 23 and being discharged to the outside of the scroll compressor 101 between the boss accommodating portion 32 and the lower oil reservoir.

[0027] Furthermore, the third oil path 41 is made up of the rotating shaft 13, the upper balancer 13h, and the rotor 23, which are components that are not fixed to the sealed container 1, and the third oil path 41 can be assembled in a state where the components are not fixed to the sealed container 1. Therefore, compared to the method of Patent Document 1 in which the oil return path is passed around the outer periphery of the stator 22 inside the sealed container 1 in a state where either the main bearing 30 or the stator 22 is fixed to the sealed container 1, the production time can be shortened and the production cost can be kept low.

[0028] Furthermore, by fixing the rotor 23 and the oil guide plate 43 with the rivets 44, the number of assembly steps can be reduced compared to a method in which the rotor 23 is fixed with the rivets 44 and then the rotor 23 and the oil guide plate 43 are fixed to the rotating shaft 13 by shrink fitting or press fitting, etc. (Embodiment 2) Hereinafter, embodiment 2 will be described with reference to FIG. 6. [2-1. Configuration]

[0029] 6, the oil guide plate 43 is made of a magnetic material such as carbon tool steel (SK material) or general structural rolled steel (SS material), and a magnet 45 is embedded in the rotor 23. The oil guide plate 43 is disposed closer to the center of the rotating shaft 13 than the point of the magnet 45 closest to the center of the rotating shaft 13. [2-2. Effects]

[0030] Magnetic materials, such as carbon tool steel (SK material) and general structural rolled steel (SS material), are less likely to bite into the material during grinding compared to non-magnetic materials, such as stainless steel (SUS material), allowing for a greater depth of cut. This reduces the time required for grinding and reduces processing costs. Using SK material or SS material for the oil guide plate 43, as in the second embodiment, reduces processing costs compared to using SUS material or the like.

[0031] On the other hand, when a component made of a magnetic material is arranged near the rotor 23, if the component is arranged so that it straddles the magnet 45 from the center of the rotating shaft 13 to the outside, it is known that the total magnetic flux of the rotor 23 decreases, and motor efficiency decreases. Therefore, by making the oil guide plate 43 out of a magnetic material and further by placing it closer to the center of the rotating shaft 13 than the magnet 45, it is possible to achieve both low processing costs for the oil guide plate 43 and high motor efficiency. (Embodiment 3) Hereinafter, embodiment 3 will be described using FIG. 7. [3-1. Configuration]

[0032] 7, in the third embodiment, the upper balancer 13h and the rotor 23 are in contact with each other, and the third oil path 41 and the fourth oil path 42 are in communication with each other. [3-2. Effects]

[0033] 7, the number of parts can be reduced compared to the first and second embodiments because the oil guide plate 43 is not required. (Fourth Embodiment) Hereinafter, a fourth embodiment will be described with reference to FIG. 8. [4-1. Configuration]

[0034] 8, in the seventh embodiment, when the minimum path cross-sectional area of ​​the first oil path 46 from the tip of the oil pump 5 to the inside of the boss portion 12c is a, the minimum path cross-sectional area of ​​the third oil path 41 is b, and the minimum path cross-sectional area of ​​the fourth oil path 42 is c, a≦b and a≦c are satisfied. [4-2. Effects]

[0035] By configuring as in embodiment 4, the third oil path 41 and the fourth oil path 42 are made larger than the first oil path 46, which is the oil supply path, so that the supplied oil can be reliably discharged from the third oil path 41 and the fourth oil path 42.

[0036] The present disclosure has been described above using the above-mentioned embodiments. However, since the above-mentioned embodiments are intended to illustrate the technology in the present disclosure, various modifications, substitutions, additions, omissions, etc. can be made within the scope of the claims or their equivalents.

[0037] The scroll compressor according to the present disclosure can achieve high efficiency and is therefore useful in various refrigeration cycle devices such as hot water heating systems, air conditioners, water heaters, and refrigerators.

[0038] REFERENCE SIGNS LIST 1 sealed container 1a body 1b bottom cover 1c top cover 2 refrigerant suction pipe 3 refrigerant discharge pipe 4 oil storage section 5 oil pump 6 discharge chamber 10 compression mechanism section 11 fixed scroll 11a fixed scroll end plate 11b fixed spiral wrap 11c outer circumferential wall section 12 orbiting scroll 12a orbiting scroll end plate 12b orbiting spiral wrap 12c boss section 12d orbiting bearing 13 rotating shaft 13a main shaft section 13b eccentric shaft section 13c lower end section 13d rotating shaft oil supply vertical hole 13e oil groove 13f oil groove 13h upper balancer 13i connection section 13j oil supply horizontal hole 13k lower balancer 14 discharge port 15 compression chamber 15a suction port 17 Oldham ring 18 Auxiliary bearing 20 Electric mechanism 22 Stator 23 Rotor 30 Main bearing 31 Bearing 32 Boss accommodating portion 33 Seal member 41 Third oil path 41a Rotating shaft path 41b Upper balancer path 42 Fourth oil path 43 Oil guide plate 43a Contact surface with balancer 43b Contact surface with rotor 44 Rivet 45 Magnet 46 First oil path 50 Bottom end of oil groove 13 51 Bottom end of main bearing 101 Scroll compressor

Claims

1. A compressor comprising a compression mechanism for compressing a refrigerant and an electric mechanism for driving the compression mechanism via a rotating shaft; a sealed container for housing the compression mechanism and the electric mechanism, with an oil reservoir formed on the inner bottom; a main bearing comprising a bearing for supporting the rotating shaft and a boss housing; the rotating shaft is provided with an upper balancer, a main shaft, and an eccentric shaft that is eccentric with respect to the rotating shaft; the rotating shaft has a first oil path for guiding lubricating oil stored in the oil reservoir to the boss housing via the eccentric shaft; the rotating shaft has a second oil path for guiding the lubricating oil stored in the oil reservoir to the boss housing via the main shaft; the rotating shaft or the upper balancer, or both, are provided with a third oil path for discharging oil stored in the boss housing to the bottom of the upper balancer; the electric mechanism is composed of a rotor and a stator; a fourth oil path is provided inside the rotor, penetrating the upper end and the lower end in the axial direction; and an oil guide plate is provided between the upper balancer and the rotor, and the third oil path and the fourth oil path are connected by the oil guide plate.

2. The scroll compressor according to claim 1, wherein the oil guide plate is fixed to the upper balancer or the electric mechanism.

3. The scroll compressor according to claim 1 or 2, characterized in that the oil guide plate is made of a magnetic material, a magnet is embedded in the rotor, and the oil guide plate is positioned closer to the center of the rotating shaft than the magnet.

4. A compressor comprising a compression mechanism for compressing a refrigerant and an electric mechanism for driving the compression mechanism via a rotating shaft; a sealed container for housing the compression mechanism and the electric mechanism and having an oil reservoir formed on its inner bottom; a main bearing comprising a bearing for supporting the rotating shaft and a boss housing; the rotating shaft is provided with an upper balancer, a main shaft, and an eccentric shaft that is eccentric with respect to the rotating shaft; the rotating shaft has a first oil path for guiding lubricating oil stored in the oil reservoir to the boss housing via the eccentric shaft; the rotating shaft has a second oil path for guiding the lubricating oil stored in the oil reservoir to the boss housing via the main shaft; the rotating shaft or the upper balancer, or both, are provided with a third oil path for discharging oil stored in the boss housing to the bottom of the upper balancer; the electric mechanism is composed of a rotor and a stator; A scroll compressor characterized in that a fourth oil path is provided inside the rotor, penetrating the upper end and the lower end in the axial direction, the upper balancer and the rotor are in contact, and the third oil path and the fourth oil path are connected.

5. A scroll compressor according to any one of claims 1 to 4, characterized in that when the minimum path cross-sectional area of ​​the first oil path and the second oil path is a, the minimum path cross-sectional area of ​​the third oil path is b, and the minimum path cross-sectional area of ​​the fourth oil path is c, a≦b and a≦c are satisfied.