JPH09209957A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To return a lubrication oil to the bottom of a housing smoothly with out dripping a motor efficiency and prevent the flow out of the lubrication to the outside of the housing. SOLUTION: A tightly closed compressor 1 is provided with a compression mechanism 11 supported to the upper part of a tightly closed housing 2 through a frame 6, a motor 38 having a rotary shaft 41 for driving this compression mechanism and an oil pump 49, driven by the rotary shaft, for supplying the lubrication oil to the compression mechanism. An oil passage 61, by which the lubrication oil discharged from the exhaust oil hole 36 of the frame is introduced, is formed between the stator 39 of the motor and the periphery wall 3a of the housing. The oil passage is constituted by the periphery wall of the housing is deformed to the direction parting from the stator and has the same or more area in comparison with the area of the exhaust oil hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used for compressing a gas such as a refrigerant gas, and more particularly to the structure of a lubricating oil return path.

[0002]

2. Description of the Related Art An air conditioner is equipped with a hermetic compressor for compressing a refrigerant gas vaporized in an evaporator into a state in which it can be easily liquefied again. As this hermetic compressor, there is known a scroll compressor having an orbiting scroll and a fixed scroll that mesh with each other.

FIG. 7 discloses an example of a conventional scroll type compressor 1. The compressor 1 has a sealed housing 2. The housing 2 includes a hollow cylindrical housing body 3, a top cover 4 that closes the upper end of the housing body 3, and a bottom cover 5 that closes the lower end of the housing body 3.

An upper frame 6 and a lower frame 7 are housed inside the housing 2. The upper frame 6 is supported on the upper part of the housing body 3, and the lower frame 7 is supported on the lower part of the housing body 3.

The upper frame 6 cooperates with the housing body 3 and the top cover 4 to form a scroll accommodating chamber 8. The scroll accommodating chamber 8 is located above the housing 2. Further, a space portion surrounded by the housing body 3, the upper frame 6 and the lower frame 7 forms a motor accommodating chamber 9. The motor housing chamber 9 is
A suction pipe 10 is connected to the upper part of the motor storage chamber 9 located below the scroll storage chamber 8. The suction pipe 10 is connected to an evaporator (not shown), and the refrigerant gas from the evaporator is introduced into the motor housing chamber 9 through the suction pipe 10. And
The motor accommodating chamber 9 is connected to the scroll accommodating chamber 8 via a gas passage 9a formed in the upper frame 6.

A scroll type compression mechanism 11 is arranged in the scroll accommodating chamber 8. This compression mechanism 11
A fixed scroll 12 and an orbiting scroll 13 are provided. The fixed scroll 12 has an end plate 14 fixed to the outer peripheral portion of the upper surface of the upper frame 6, and a spiral wrap 15 formed on the lower surface of the end plate 14. The orbiting scroll 13 has an end plate 16 rotatably supported on the upper surface of the upper frame 6, and a spiral wrap 17 formed on the upper surface of the end plate 16. The fixed scroll 12 and the orbiting scroll 13 are eccentric with respect to each other by a predetermined distance, and are overlapped with each other in a state where they are offset by 180 degrees in the circumferential direction. Therefore, lap 15,
17 are in mesh with each other and these wraps 15, 1
A plurality of closed spaces 18 are formed between the seven. A suction port 19 is formed on the side surface of the fixed scroll 12 so that the outermost space 18 and the scroll accommodating chamber 8 communicate with each other.

The end plate 14 of the fixed scroll 12 has a recess 14a opened upward on the upper surface opposite to the wrap 15. The open end of the concave portion 14a has a cover plate 20.
The discharge chamber 21 is formed between the cover plate 20 and the recess 14a. A discharge port 22 that opens the space 18 and the discharge chamber 21 is opened at the center of the end plate 14. A discharge valve 23 that opens and closes the discharge port 22 is supported on the end plate 14, and the discharge valve 23 extends from the space 18 to the discharge chamber 21.
It is a check valve that allows only the flow toward. A discharge pipe 24 connected to the discharge chamber 21 is connected to the cover plate 20. The discharge pipe 24 extends through the scroll accommodating chamber 8 to the outside of the housing 2 and is connected to a condenser (not shown).

The upper surface of the upper frame 6 supporting the orbiting scroll 13 is a flat supporting surface 6a. The supporting surface 6a slidably contacts the end plate 16 of the orbiting scroll 13, and an oil groove 26 is formed in the supporting surface 6a. Further, the fitting recess 2 is provided at the center of the support surface 6a.
7 are formed. The opening end of the fitting recess 27 has the end plate 1
It is closed by 6, and the inside of this fitting recess 27 serves as an oil sump chamber 28.

On the lower surface of the end plate 16, a boss portion 30 which projects into the fitting recess 27 is provided. The boss portion 30 is located eccentrically with respect to the fitting recess 27, and the boss portion 3
A part of the peripheral surface of 0 is slidably in contact with the inner surface of the fitting recess 27. A fitting hole 31 is coaxially formed on the lower surface of the boss portion 30. The fitting hole 31 faces the bottom surface of the fitting recess 27, and inside the fitting hole 31,
A cylindrical bush 33 is rotatably mounted via a swivel bearing 32.

The orbiting scroll 13 is supported by the upper frame 6 through a rotation preventing mechanism 34 such as an Oldham ring that allows rotation of the orbiting scroll 13 but prevents rotation thereof.

An oil drain hole 36 is formed in the upper frame 6. The oil drain hole 36 has a first opening end 36 a opening at the bottom of the oil sump chamber 28 and a second opening end 36 b opening at the peripheral surface of the upper frame 6. The second opening end 36b is connected to the motor housing chamber 9. Then, the oil drain hole 36 extends from the first opening end 36a to the second opening end 36a.
It is inclined downward as it goes to the open end 36b.

A motor 38 is housed in the motor housing chamber 9. The motor 38 includes a tubular stator 39 and a rotor 40 arranged inside the stator 39. The stator 39 is fixed to the peripheral wall 3 a of the housing body 3, and the suction pipe 10 is located near the upper end of the stator 39.

The rotor 40 has a rotating shaft 4 at the center of rotation.
One. The rotary shaft 41 is arranged along the central axis of the housing 2. The upper end of the rotary shaft 41 is rotatably supported by the upper frame 6 via a bearing 42, and the lower end is rotatably supported by the lower frame 7 via another bearing 43.

The rotary shaft 41 has an eccentric pin 45 at the upper end. The eccentric pin 45 is located eccentrically from the center of rotation of the rotary shaft 41, and the eccentric pin 45 penetrates the upper frame 6 and is rotatably fitted to the bush 33 of the boss portion 30.

A storage chamber 48 for storing lubricating oil is formed between the bottom cover 5 and the lower frame 7.
The storage chamber 48 is located at the bottom of the housing 2, and a positive displacement oil pump 49 is installed on the lower surface of the lower frame 7 facing the storage chamber 48. The oil pump 49 has a rotating shaft 4
The rotary shaft 41 is connected to the lower end of the oil pump 1, and a suction pipe 50 for sucking the lubricating oil is connected to a suction port (not shown) of the oil pump 41. . The discharge port (not shown) of the oil pump 49 is
It connects to an oil supply passage 51 formed inside the rotary shaft 41. The oil supply passage 51 extends along the axial direction of the rotating shaft 41, and the upper end thereof is opened to the upper end surface of the eccentric pin 45. Further, the oil supply passage 51 is the branch passage 52.
a, 52b, and these branch passages 52a, 52b are
Openings are formed in the outer peripheral surface of the upper end portion and the outer peripheral surface of the lower end portion of the rotating shaft 41, respectively.

The peripheral wall 3a of the housing body 3 and the motor 38
A return passage 55 for returning the lubricating oil to the storage chamber 48 is formed between the return passage 55 and the stator 39. Return passage 55
Has a recess 56 formed on the outer peripheral surface of the stator 39. The recess 56 is formed by cutting the outer peripheral surface of the stator 39 in a groove shape, and extends along the axial direction of the housing 2. The return passage 55 has an inlet 55a opened on the upper surface of the stator 39 and an outlet 55b opened on the lower surface of the stator 39.
Is located below the oil drain hole 36.

In the compressor 1 having such a structure, when the motor 38 is driven and the rotary shaft 41 is rotated in the axial direction, the eccentric pin 45 revolves around the rotary shaft 41, and the eccentric pin 45 is rotated. The orbital movement of is transmitted to the orbiting scroll 13. At this time, the orbiting scroll 13 revolves on a circular orbit of the orbiting radius while being prevented from rotating due to the existence of the rotation preventing mechanism 34, and the space 18 between the orbiting scroll 13 and the fixed scroll 12 is rotated. The volume of fluctuates.

As a result, a negative pressure is generated at the suction port 19, and the refrigerant gas from the evaporator is sucked into the motor storage chamber 9 through the suction pipe 10 and then into the scroll storage chamber 8 through the gas passage 9a. Be done. The refrigerant gas sucked into the scroll accommodating chamber 8 reaches the space 18 through the suction port 19 and is gradually compressed to the center of the orbiting scroll 13 while being gradually compressed due to the decrease in the volume of the space 18 due to the orbiting revolution motion of the orbiting scroll 13. To reach. Then, when the pressure of the refrigerant gas reaches the desired condensing pressure, the discharge valve 23 automatically opens, and the compressed refrigerant gas is sent to the discharge chamber 21. This high-pressure refrigerant gas is sent from the discharge chamber 21 to the condenser via the discharge pipe 24.

Further, since the rotary shaft 41 drives the oil pump 49 simultaneously with the orbiting scroll 13, the lubricating oil stored in the storage chamber 48 is sucked up through the suction pipe 50 of the oil pump 49, and the rotary shaft 41 is rotated. It is sent to the fuel supply passage 51 of 41. A part of this lubricating oil is guided from the oil supply passage 51 to the branch passages 52a and 52b, and the rotary shaft 41 and the bearings 42,
Lubricate the sliding part with 43. The main flow of the lubricating oil is jetted from the upper end of the oil supply passage 51 into the fitting hole 31 of the boss portion 30,
After lubricating the eccentric pin 45, the slewing bearing 32, and the bush 33, they flow into the oil sump chamber 28. Part of the lubricating oil that has flowed into the oil sump chamber 28 is guided to the oil groove 26 and lubricates the sliding portion between the orbiting scroll 13 and the support surface 6a of the upper frame 6 and the rotation preventing mechanism 34. The lubricating oil remaining in the oil sump chamber 28 is discharged into the motor housing chamber 9 through the oil discharge hole 36, passes through the return passage 55 between the stator 39 of the motor 38 and the housing body 3, and the storage chamber 4 at the bottom of the housing 2 is discharged.
Returned to 8.

[0020]

According to the above conventional compressor 1, a part of the lubricating oil discharged from the oil discharge hole 36 of the upper frame 6 into the motor accommodating chamber 9 is part of the inner surface of the peripheral wall 3a of the housing body 3. Adhere to. The lubricating oil attached to the peripheral wall 3a flows downward along the peripheral wall 3a due to gravity, and is guided to the inlet 55a of the return passage 55 via the upper surface of the stator 39. Then, the lubricating oil drops through the return passage 55 and is returned to the storage chamber 48 from the outlet 55b at the lower end of the return passage 55.

In this case, since the conventional return passage 55 is formed by denting the outer peripheral surface of the stator 39 in a groove shape, if the depth of the recess 56 is increased in order to secure the area of the return passage 55. , The area of the stator 39, that is,
The area of the part where the magnetism passes decreases. As a result, the magnetic flux density becomes excessive and the loss becomes large, and the efficiency of the motor 38 deteriorates.

On the contrary, in order to improve the efficiency of the motor 38,
If the depth of the recess 56 is reduced, the area of the return passage 55 cannot be sufficiently secured. Then, the oil drain hole 3
The lubricating oil discharged from 6 is the inlet 55a of the return passage 55.
The overflowed lubricating oil is diffused by the rotating rotor 40 and the rotating shaft 41, and is scattered as mist in the upper portion of the motor housing chamber 9.

When the lubricating oil is discharged from the oil discharge hole 36 into the motor housing chamber 9, a part of the lubricating oil is scattered under the influence of the refrigerant gas flowing in the motor housing chamber 9, The room is filled with mist. Therefore, the mist-like lubricating oil is sucked into the compression mechanism 11 through the gas passage 9a and the suction port 19 together with the refrigerant gas, and is discharged to the condenser through the discharge pipe 24.

Especially when the rotation speed of the motor 38 is high,
Since the amount of oil supplied from the oil pump 49 to the compression mechanism 11 and the amount of oil discharged from the oil discharge hole 36 to the motor housing chamber 9 increase, the flow velocity of the refrigerant gas in the motor housing chamber 9 is high, The amount of lubricating oil contained in the refrigerant gas tends to increase, and more lubricating oil flows out to the refrigerant gas flow system.

That is, when the discharge amount (Kg / h) of the refrigerant gas from the discharge pipe 24 is L and the outflow amount (Kg / h) of the lubricating oil mixed in the refrigerant gas is O, the outflow rate of the lubricating oil OC (%)
Becomes OC (%) = O / L × 100, and the value of OC (%) becomes high. As a result, the lubricating oil flows into the condenser and the evaporator and adheres to the inner surfaces of the condenser and the evaporator, which causes a decrease in the heat transfer coefficient and adversely affects the refrigeration cycle.

Further, since the lubricating oil discharged from the oil discharge hole 36 circulates in the refrigerant gas flow system, the amount of lubricating oil returned to the storage chamber 48 gradually decreases. Therefore, the compressor 1
The lubricating oil stored in the storage chamber 48 will be depleted with the lapse of the operating time, and the lubrication of the bearings 42, 43 and the compression mechanism 11 will be insufficient, causing seizure and noise. There's a problem.

The present invention has been made under such circumstances, and the lubricating oil discharged from the oil drain hole can be smoothly returned to the bottom of the housing without lowering the motor efficiency. It is an object of the present invention to provide a hermetic compressor that can reliably prevent oil from leaking out.

[0028]

In order to achieve the above-mentioned object, the invention described in claim 1 is a sealed housing to which gas is supplied; a frame supported on the upper part of this housing; Slidably supported by
A compression mechanism for compressing the gas supplied into the housing; a motor installed below the compression mechanism in the housing; a rotor of the motor and a compression mechanism are interlocked to drive the compression mechanism. A rotary shaft for connecting the lower end of the rotary shaft and sucking the lubricating oil stored in the bottom of the housing, and passing the lubricating oil through the oil supply passage inside the rotating shaft of the compression mechanism. An oil pump for supplying the sliding portion, the lubricating oil supplied to the sliding portion of the compression mechanism is discharged below the compression mechanism through an oil discharge hole of the frame, and the lubricating oil is also discharged. Is premised on a hermetic compressor in which is returned to the bottom of the housing through an oil passage formed between the stator of the motor and the peripheral wall of the housing.

The oil passage is formed by deforming the peripheral wall of the housing so as to project in a direction away from the stator, and the oil passage is formed at least from a position corresponding to the oil drain hole of the housing. It is characterized in that it extends toward the bottom and has an area equal to or larger than the area of the oil drain hole.

According to this structure, an oil passage having a sufficient width can be formed between the stator of the motor and the peripheral wall of the housing without largely denting the stator, and the area of the stator through which the magnetic flux passes is sufficient. Can be secured.
Therefore, the magnetic flux density of the motor does not become excessive,
It is possible to maintain good motor efficiency.

Moreover, the lubricating oil returned from the oil drain hole is smoothly returned to the bottom of the housing through the oil passage, and this lubricating oil can be prevented from overflowing from the oil passage. Therefore, it is possible to prevent the lubricating oil from diffusing in the housing or mixing with the gas,
The amount of lubricating oil that flows out of the housing can be reduced.

According to a second aspect, in the first aspect, a guide is provided between the oil drain hole and the oil passage for guiding the lubricating oil discharged from the oil drain hole to the oil passage. It is characterized by that.

According to this structure, the lubricating oil discharged from the oil discharge hole can be positively guided to the oil passage through the guide, and this lubricating oil mixes with the gas or receives the flow of this gas. It can be surely prevented from scattering. Therefore, the outflow of the lubricating oil can be further suppressed, and the deterioration of the lubricating oil due to the contact with the gas can be prevented.

According to a third aspect of the present invention, a return pipe is connected to the oil drain hole of the frame according to the second aspect, and the tip of the return pipe is inserted into the guide.

According to this structure, the lubricating oil discharged from the oil drain hole is guided into the guide through the return pipe, so that the influence of the gas flowing in the housing is reached until the lubricating oil reaches the guide. Therefore, it is possible to more reliably prevent the lubricating oil from being mixed with gas or scattered. Therefore, the lubricating oil can be prevented from flowing out of the housing, and the lubricating oil can be prevented from being deteriorated due to the contact with the gas.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. The first embodiment is different from the conventional compressor mainly in the structure of the oil passage for returning the lubricating oil to the bottom of the housing, and the other basic structure of the compressor is the same as that of the conventional compressor. It is the same as the compressor. Therefore, in the first embodiment, the same components as those of the conventional compressor are designated by the same reference numerals,
The description is omitted.

As shown in FIGS. 1 and 2, the motor 38
The oil passage 61 formed between the stator 39 and the peripheral wall 3a of the housing body 3 is
Is deformed so as to project toward the outside.

That is, the peripheral wall 3a of the housing body 3
Is located at a position corresponding to the stator 39.
Has a bulging portion 62 bulging in a direction away from the outer peripheral surface of the. The bulging portion 62 has a groove shape extending linearly along the axial direction of the housing body 3. The upper end of the bulging portion 62 extends above the upper surface of the stator 39, and the lower end of the bulging portion 62 extends below the lower surface of the stator 39.

Further, a portion of the outer peripheral surface of the stator 39 which faces the oil passage 61 is cut flat. The cut portion 39a of the stator 39 extends in the axial direction of the stator 39 and faces the bulging portion 62 of the housing body 3.

The oil passage 61 has an inlet 6 opened upward.
1a and an outlet 61b opened downward. The inlet 61a of the oil passage 61 is provided at the second end of the oil drain hole 36.
Is located below the open end 36b. Therefore, the oil passage 61 extends from the position corresponding to the oil drain hole 36 toward the bottom of the housing 2, and the oil passage 61 has an area equal to or larger than the area of the oil drain hole 36. doing.

According to this structure, the lubricating oil discharged from the oil discharge hole 36 into the motor accommodating chamber 9 flows along the inner surface of the peripheral wall 3a into the oil passage 61, falls through the oil passage 61, and falls into the housing 2 It is returned to the storage chamber 48.

In this case, since the oil passage 61 is obtained by deforming the peripheral wall 3a of the housing body 3 in a direction away from the stator 39, it is not necessary to provide a large groove-like recess on the outer peripheral surface of the stator 39. for that reason,
The area of the stator 39, that is, the area through which the magnetic flux passes can be sufficiently secured, the magnetic flux density of the motor 38 can be prevented from becoming excessive, and the motor efficiency can be favorably maintained.

Moreover, according to the above configuration, the area of the oil passage 61 is defined to be equal to or larger than the area of the oil discharge hole 36, so that the lubricating oil reaching the inlet 61a of the oil passage 61 is Through the oil and smoothly flowing downward, the oil passage 6
It is discharged from the outlet 61b of No. 1 toward the storage chamber 48. Therefore, the lubricating oil flows smoothly in the oil passage 61,
The lubricating oil does not overflow from the inlet 61a of the oil passage 61, and the lubricating oil is less likely to be affected by the flow of the refrigerant gas drawn into the motor housing chamber 9.

Therefore, it is possible to prevent the lubricating oil from scattering in the motor accommodating chamber 9 and the mixing thereof with the refrigerant gas, and the amount of the lubricating oil sucked into the compression mechanism 11 is reduced. As a result, the amount of lubricating oil flowing out of the housing 2, that is, the OC (%) is reduced, and the lubricating oil introduced to the condenser and the evaporator is reduced accordingly, and the heat of the condenser and the evaporator is reduced. It is possible to prevent a decrease in transmissibility.

At the same time, since the outflow of the lubricating oil is suppressed, there is no fear that the lubricating oil stored in the storage chamber 48 will be depleted, and especially when the rotation speed of the rotating shaft 41 of the motor 38 is high. The lubricating oil can be stably supplied to the compression mechanism 11. Therefore, seizure of the bearings 42, 43 and the compression mechanism 11 due to insufficient lubrication can be reliably prevented, and the reliability of lubrication is improved.

The present invention is not limited to the above-mentioned first embodiment, but FIGS. 3 and 4 show a second embodiment of the present invention. The second embodiment is different from the first embodiment mainly in the returning path of the lubricating oil from the oil discharge hole to the oil passage, and other configurations are the same as those in the first embodiment. It is the same as the form. Therefore, in the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 3, in the motor housing chamber 9,
A guide 71 for guiding the lubricating oil discharged from the oil discharge hole 36 to the oil passage 61 is arranged. The guide 71 is a main body 72 supported on the inner surface of the peripheral wall 3 a of the housing main body 3.
And an oil receiving portion 73 connected to the upper end of the main body 72.

As shown in FIG. 4, the main body 72 of the guide 71 is
Has a gutter shape. The main body 72 is fitted over the bulging portion 62 of the housing main body 3, and the main body 7
2 is a hollow cylindrical main passage 74 in cooperation with the bulging portion 62.
Is composed. The main passage 74 extends in the up-down direction along the central axis of the housing 2 while being partitioned from the motor housing chamber 9. The lower end of the main passage 74 faces the inlet 61 a of the oil passage 61.

The oil receiving portion 73 has a trough shape extending from the upper end of the main body 72 toward the second opening end 36b of the oil drain hole 36. The tip of the oil receiving portion 73 has a second
Up to the open end 36b of the. This oil receiving portion 73
Is inclined downward as it goes from the tip toward the upper end of the main body 72.

According to this structure, the lubricating oil discharged from the oil discharge hole 36 is received by the oil receiving portion 73 of the guide 71 and guided to the main passage 74 along the oil receiving portion 73. Then, this lubricating oil is supplied to the main passage 7
The oil flows downward through the inner surface of No. 4 and is guided to the inlet 61a of the oil passage 61.

According to the second embodiment as described above, the lubricating oil discharged from the oil drain hole 36 is received by the oil receiving portion 73 of the guide 71, and then the lubricating oil is passed through the hollow cylindrical main passage 74. It is actively guided to the passage 61. Therefore, the lubricating oil discharged from the oil discharge hole 36 can be reliably held in the oil passage 6
1 and the lubricating oil is less likely to diffuse into the motor accommodating chamber 9.

Moreover, the main body 72 of the guide 71 and the peripheral wall 3a
The main passage 74 surrounded by and is a hollow cylindrical passage that is separated from the motor housing chamber 9 into which the refrigerant gas is sucked, so that the lubricating oil flowing therethrough mixes with the refrigerant gas or It does not need to be diffused by the gas flow.

Therefore, the amount of lubricating oil flowing out of the housing 2, that is, the OC (%) is reduced, and the lubricating oil can be stably supplied to the bearings 42, 43 and the compression mechanism 11. At the same time, the lubricating oil is not diluted by mixing with the refrigerant gas and the quality is not deteriorated, and the reliability of lubrication can be further enhanced.

Further, FIG. 5 discloses a third embodiment of the present invention. In the third embodiment, the oil drain hole 36
The third embodiment is different from the second embodiment in that a dedicated return pipe 81 is connected to the second opening end 36b of the above, and the other configurations are the same as those in the second embodiment.

As shown in FIG. 5, the return pipe 81 is led out from the oil drain hole 36 and then bent downward. The tip 82 of the return pipe 81 is inside the oil receiving portion 73 of the guide 71. Has been inserted into.

According to this structure, the lubricating oil discharged from the oil drain hole 36 directly flows into the oil receiving portion 73 of the guide 71 through the return pipe 81, so that the lubricating oil is surely passed through the oil receiving portion 73 to the main oil receiving portion 73. It can lead to the passage 74.
Therefore, the lubricating oil discharged from the oil discharge hole 36 is not affected by the flow of the refrigerant gas and is not mixed with the refrigerant gas or diffused widely in the motor housing chamber 9, and is sucked by the compression mechanism 11. The amount of waste is reduced. As a result, there is an advantage that the amount of lubricating oil substantially flowing out of the housing 2, that is, the OC (%) is further reduced.

Further, FIG. 6 discloses a fourth embodiment of the present invention. The fourth embodiment is the same as the third embodiment.
The oil passage 91
The configuration is different from that of the third embodiment.

The oil passage 91 of the fourth embodiment has a first passage portion 91a and a second passage portion 91b connected to the first passage portion 91a. First passage portion 91
The reference numeral “a” has a bulging portion 92 that bulges the peripheral wall 3 a of the housing body 3 in a direction away from the outer peripheral surface of the stator 39. The bulging portion 92 has a groove shape extending along the axial direction of the housing body 3.

The upper end of the bulging portion 92 extends above the upper surface of the stator 39, and the main body 72 of the guide 71 is fitted to the upper portion of the bulging portion 92. The lower end of the bulging portion 92 is located at an intermediate portion in the vertical direction of the stator 39, and the lower end of the bulging portion 92 is inclined so as to gradually enter the inside of the housing main body 3 and the housing main body 3 is inclined. 3 is connected to the peripheral wall 3a. And the bulge 9
The area of the first passage portion 91a between the 2 and the cut portion 39a of the stator 39 is defined to be significantly larger than the area of the oil drain hole 36.

The second passage portion 91b is formed between the peripheral wall 3a of the housing body 3 and the cut portion 39a of the stator 39. The area of the second passage portion 91b is equal to or larger than the area of the oil drain hole 36,
Further, it is set to be smaller than the area of the first passage portion 91a.

According to this structure, the area of the first passage portion 91a, which serves as the inlet of the oil passage 91, is large in area.
Since it is much larger than the above, the lubricating oil guided from the guide 71 quickly flows downward in the first passage portion 91a.
Then, even if the second passage portion 91b in which the first passage portion 91a is continuous is formed, the area thereof is set to be equal to or larger than that of the oil drain hole 36, so that the lubricating oil from the first passage portion 91a is It smoothly flows downward without staying in the second passage portion 91b.

Therefore, if the area of the second passage portion 91b is sufficient, the bulging portion 92 of the housing body 3 may be formed partway in the stator 39. In the case of this configuration, the area of the oil passage 91 is further increased, so that the lubricating oil is supplied in a large amount and the lubricating oil is efficiently supplied, as when the orbiting scroll 13 of the compression mechanism 11 rotates at a high speed. It is convenient when it is necessary to return it to the storage chamber 48.

The oil passage 91 of this type can be similarly implemented in the second embodiment which does not have a return pipe and the first embodiment which does not have a return pipe and a guide.

In each of the above embodiments, the oil passages are provided only at the positions corresponding to the oil drain holes, but the present invention is not limited to this, and the oil passages are provided at a plurality of locations spaced in the circumferential direction of the stator. May be formed.

[0065]

According to the first aspect of the present invention, it is possible to form a sufficiently wide oil passage between the stator of the motor and the peripheral wall of the housing while maintaining good motor efficiency.
Therefore, the lubricating oil discharged from the oil drain hole is smoothly returned to the bottom of the housing through the oil passage, and this lubricating oil can be prevented from overflowing from the oil passage. Therefore, the lubricating oil does not need to be widely diffused in the housing, so that the amount of the lubricating oil mixed with the gas and flowing out of the housing can be suppressed to a small amount, and the lubricating oil can be stably slid on the compression mechanism. Can lead to parts.

According to the second aspect, the lubricating oil discharged from the oil discharging hole can be reliably and positively guided to the oil passage through the guide, and this lubricating oil is less likely to diffuse inside the housing. . Moreover, since the lubricating oil is guided to the oil passage along the guide, the lubricating oil flowing there is less likely to be mixed with the gas or affected by the flow of this gas, and the amount of the lubricating oil flowing out of the housing is reduced. Can be kept low. As a result, the reduction of lubricating oil can be prevented and
Lubricating oil is not diluted by mixing with gas, and quality is not deteriorated, and the reliability of lubrication is improved.

According to the third aspect, the lubricating oil discharged from the oil discharge hole can be reliably guided to the guide through the return pipe, and this lubricating oil is influenced by the flow of gas and enters the housing. It is not widely diffused or mixed with gas. Therefore, there is an advantage that the amount of the lubricating oil flowing out of the housing can be suppressed to a smaller amount and the reduction of the lubricating oil can be surely prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a sectional view of a scroll type compressor according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line BB in FIG. 3;

FIG. 5 is a sectional view of a scroll compressor according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a scroll compressor according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a conventional scroll compressor.

[Explanation of symbols]

 2 ... Housing 3a ... Peripheral wall 6 ... Frame (upper frame) 11 ... Compression mechanism 36 ... Oil drain hole 38 ... Motor 39 ... Stator 40 ... Rotor 41 ... Rotating shaft 49 ... Oil pump 51 ... Oil supply passage 61, 91 ... Oil passage

Claims (3)

[Claims] 1. A hermetically sealed housing to which gas is supplied; a frame supported on an upper portion of the housing; and a frame slidably supported by the frame for compressing the gas supplied into the housing. A compression mechanism; a motor installed below the compression mechanism in the housing; a rotation shaft for driving the compression mechanism by linking the rotor of the motor with the compression mechanism; a lower end of the rotation shaft An oil pump that is connected to the pump and that sucks the lubricating oil stored in the bottom of the housing and that supplies the lubricating oil to the sliding portion of the compression mechanism via the oil supply passage inside the rotary shaft. The lubricating oil supplied to the sliding portion of the compression mechanism is discharged to the lower side of the compression mechanism through the oil drain hole of the frame, and the lubricating oil is also discharged from the motor. In the hermetic compressor, which is configured to return to the bottom of the housing through an oil passage formed between the rotor and the peripheral wall of the housing, the oil passage extends over the peripheral wall of the housing away from the stator. The oil passage extends at least from a position corresponding to the oil drain hole toward the bottom of the housing and has an area equal to or larger than the area of the oil drain hole. The hermetic compressor is characterized by 2. The guide according to claim 1, further comprising a guide provided between the oil discharge hole and the oil passage for guiding the lubricating oil discharged from the oil discharge hole to the oil passage. Hermetic compressor. 3. The hermetic compressor according to claim 2, wherein a return pipe is connected to the oil drain hole of the frame, and a tip of the return pipe is inserted into the guide.