JP2539552B2 - Hermetic scroll compressor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic scroll compressor used as a refrigerating compressor for refrigeration and air conditioning, and more particularly to an oil supply structure for a rotation preventing member for preventing rotation of a rotating scroll member. Regarding

[0002]

2. Description of the Related Art In a conventional scroll compressor, as an autorotation preventing mechanism for preventing the orbiting scroll from rotating and making an orbiting motion, an annular member is provided at the back of the orbiting scroll as disclosed in, for example, Japanese Patent Application Laid-Open No. 53-35840. And a stationary pedestal provided on the frame, one end surface of the annular member and the back surface of the orbiting scroll, and the other end surface of the annular member and the stationary pedestal provided on the frame are respectively keyed. , and has been a slidably engaged configuration keyway direction through the keyway. However, no consideration was given to the lubrication method at the sliding portion between the key and the key groove portion. Further, JP-A-54-81543,
In Japanese Utility Model Publication No. Sho 55-46708, a swivel switch is installed in the housing chamber.
Contains crawls, balance weights and rotation prevention members,
A pressure guide that introduces the pressure of the compression chamber to the back of the orbiting scroll.
The orbiting scroll is equipped with a necessary aperture opening in the housing.
Is a double channel that connects the chamber and the housing chamber.
It is disclosed that several pieces are provided. In addition, JP-A-55-64
No. 181 gazette describes a orbiting scroll and a bar in the housing chamber.
A swivel scroll that accommodates the lance weight and rotation prevention member.
The throttle opening for pressure introduction that introduces the pressure of the compression chamber to the back of the
The mouth is provided on the orbiting scroll, and the housing has a chamber
-Provide multiple passages that connect the interior of the housing with the housing chamber.
And are disclosed.

[0003]

[SUMMARY OF THE INVENTION] above prior art, Japanese
Disclosed in Japanese Laid-Open Publication No. 54-81513 and Japanese Laid-Open Publication No. 55-46708
The space between the rotation prevention member and the empty space
Since the space communicates with the gas passage, the rotation prevention member
The lubricating oil led to the space for storing the
Since it is discharged into the space inside the closed container, the rotation prevention member is stored.
Engagement of the rotation prevention member without reaching the entire space to be stored
Insufficient lubrication of parts causes deterioration of reliability. In addition,
In the case of the 55-64181 publication, the back chamber is originally a compression chamber.
The gas in the compression chamber and the oil contained in the gas are electrically connected to the back.
When entering or exiting the room, the back room is filled with mist-like oil.
Apply mist-like oil to the key and key groove that are the rotation prevention members.
It does not disclose the technical idea of attachment.
Yes. As described above, the lubrication method in the rotation preventing mechanism is not considered, and the sliding portion between the key and the key groove causes seizure or stickiness.

An object of the present invention is to reliably supply oil to a key and a groove, which are a sliding portion of a rotation preventing mechanism, to improve the lubrication state of the sliding portion and to prevent seizure and astringency. Hold down
It is to provide a highly reliable scroll compressor.

[0005]

SUMMARY OF THE INVENTION It is an object of the invention to provide a fixed scroll and a swivel scroll associated therewith.
A crankshaft connected to the swivel scroll via a bearing and a bearing supporting the crankshaft are a frame.
In a hermetic scroll compressor equipped with a motor attached to the crankshaft and connected to the crankshaft, and a hermetically-sealed container for accommodating these constituent members, the inside of the hermetically-sealed container is provided at the back of the orbiting scroll. The space is pressure sealed.
A space (hereinafter referred to as a back pressure chamber) is provided which communicates with a compression chamber formed by both scroll members through a passage and maintains a pressure intermediate between the suction pressure and the discharge pressure, and swirls in the back pressure chamber. This is achieved by providing a rotation preventing member for preventing the rotation of the scroll and providing an oil supply means for supplying the lubricating oil accumulated in the closed container into the back pressure chamber.

[0006] Then, the back chamber is refueled with the closed container.
Lubricating oil is stored on the high pressure side inside, and an intermediate pressure is maintained from here
It is designed to be supplied to the space that is used .

Further , the means for supplying the lubricating oil is
As a passage provided inside the shaft that drives the orbiting scroll
It is a thing.

In the space maintained at the intermediate pressure,
A balance wheel that rotates with the shaft that drives the orbiting scroll.
Eight is attached to this shaft.

[0009]

With the above structure, since the back chamber is in communication with the compression chamber formed by the scroll members, the gas in the compression chamber and the oil contained in the gas go in and out of the back chamber.
In addition, the oil collected in the closed container is supplied to the rear chamber by the oil supply means.
Since the oil is supplied, the rear chamber is filled with mist- like oil, and this is spread over almost the entire area of the rear chamber by the functions of the rotation preventing member and the orbiting scroll member. As a result, mist-like oil adheres to the keys and the key groove portions that are the engaging portions of the rotation preventing member, the stationary member, and the orbiting scroll, and the lubrication of the sliding portion is promoted.

Further, the concentration of the oil mist in the rear chamber is maintained at an appropriate amount because the rear chamber and the compression chamber are connected by the communication hole. As a result, good lubrication is applied to the sliding surface of the rotation preventing member, and it is possible to suppress the occurrence of seizure, stickiness, and the like, and to obtain high reliability.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In this figure, a scroll compressor includes a disc-shaped end plate 1 and a spiral wrap 2 composed of an involute curve or a curve similar thereto. Fixed scroll 3 formed by standing upright
And a swivel scroll 6 formed by erecting a wrap 5 having the same shape as the wrap 2 on a disk-shaped end plate 4 and wrapping them with each other.
5 and 5 are inwardly meshed with each other, and the rear portion of the swirl scroll 6 is pressure-sealed with the space inside the closed container (chamber 13) and is formed by both scroll members 3, 6. A space that communicates with the meshing portion through the small hole 17 and is maintained at an intermediate pressure between the suction pressure and the discharge pressure (back chamber 2
5) is provided to prevent the rotation of the swivel scroll 6 in the rear chamber 25 and to prevent the center of the swivel scroll from making a planetary motion around the center of the fixed scroll 3. The Oldham ring 7 is provided between a stationary portion (frame 9 in this example) to which the fixed scroll 3 is fixed and the turning scroll 6. On the other hand, chamber 1
Frame 9 press-fitted or otherwise fixed to 3
A crankshaft 8 for driving the orbiting scroll 6 is supported by a bearing portion 9 at the center of the crankshaft, and a pin portion of the crankshaft, that is, a crankpin 8a is orbiting scroll.
Is inserted in the bearing portion 4a formed inside the end plate boss portion of the lens. The center of the crankshaft 8 coincides with the center of the fixed scroll 3, and the center of the crankpin 8a coincides with the center of the turning scroll 6. The distance between the center of the crankshaft 8 and the center of the crankpin 8a is the radius of the planetary circle movement of the orbiting scroll 6, that is, the orbiting radius. Rotational force of the crankshaft 8 is given by a rotor 11 fixed to the crankshaft 8, and the rotational force of the rotor 11 is given by a rotor.
A stator 12 is provided via a metallic terminal (not shown).
It is obtained by the electrical energy supplied to the windings of the.
That is, the motor is constituted by the rotor 11 and the stator 12. A balance weight 10 is attached to the crankshaft 8 in the rear chamber.

A pumping tip 18 for pumping oil is provided at the end of the crankshaft 8 opposite to the crankpin 8a, as shown in the figure. Inside the crankshaft 8, a pumping hole inclined with respect to the axial center line is provided. 19 is formed. As a result, the lubricating oil 20 accumulated at the bottom of the chamber 13
It is supplied to the sliding surfaces of the bearings 9a and 4a through oil supply holes 21 and 22 communicating with the oil lift hole 19 mainly by the centrifugal force of rotation.

Assuming that the spirals of the wraps 2 and 5 are formed in the counterclockwise direction when viewed from the fixed scroll 3 side, the center of the turning scroll 6 is around the center of the fixed scroll 3 (fixed scroll). With a clockwise swivel movement (as viewed from the side of the wrap), the closed space or compression chamber 15 formed between the end plates 1 and 4 and the wraps 2 and 5 is the maximum at the winding end of the wraps 2 and 5. It shrinks while moving from the volume toward the center. By repeating this movement, the low-pressure gas can be sucked from the suction port (not shown) and discharged as the high-pressure gas from the discharge port 16. However, when this device is operating, a force for separating the fixed scroll 3 and the orbiting scroll 6 from each other is generated by the fluid pressure in the compression chamber 15. Therefore, as it is, both scrolls 3 and 6
Since they are separated from each other and a normal compression operation becomes impossible, a fluid force such as gas pressure or hydraulic pressure, or a mechanical force such as a spring force is applied to the anti-lap surface of the orbiting scroll 6, and both 3 and 6 are made to act. It must be held so that it does not leave. When this force is applied by gas pressure, a part of the compression chamber and the swirl scroll 6 are attached to the end plate 4 of the swirl scroll 6 as shown in the figure.
This is achieved by providing a small hole (rear surface hole 17) communicating with the space (rear surface chamber 25) on the side opposite to the wrap side and guiding the pressure (intermediate pressure) of the compression chamber to the rear surface chamber 25.

In order to ensure stable operation of the compressor, the lubricating oil is supplied to the sliding surfaces of the respective sliding elements, especially the bearing portion 9a,
4a, the sliding surface of the fixed scroll 3 and the orbiting scroll 6, and the sliding surface of the Oldham ring, which is a rotation preventing member of the orbiting scroll, must be supplied. Since the back chamber 25 communicates with the compression chamber through the small hole 17, the gas in the compression chamber and the oil contained in the gas flow in and out of the back chamber 25. For this reason, mist-like oil is filled in the rear chamber, and this oil spreads almost all over the rear chamber 25 according to the movements of the Oldham ring 7 and the swivel scroll. As a result, mist-like oil adheres to the sliding surface of the Oldham ring and is used for lubrication. Further, the oil supplied to the bearings 9a and 4a leaks from the bearing portion to the back chamber 25, increases the amount of mist-like oil in the back chamber, and further promotes the lubrication and lubrication of the sliding surface. The oil retained as a mist in the rear chamber is used not only for lubricating the sliding surface of the Oldham ring but also for the sliding surfaces of both scroll members 3 and 6, but a part of it is used for both. From the sliding surfaces of the end plates 1 and 4 to the compression chamber 1
5 and is discharged to the outside together with the discharge gas. As a result, the amount of oil held in the rear chamber 25 is automatically adjusted and maintained at an appropriate amount.

The chamber 13 described above is a fixed scroll 3
Alternatively, the discharge chamber 31 has an inner diameter equal to the outer diameter of the frame 9, and together with the lid chamber 30, a discharge chamber 31 is formed on the side opposite to the lap of the end plate 1 of the fixed scroll. By providing such a space, it becomes possible to separate the lubricating oil contained in the discharge gas. Thickened portions 58 and 57 are provided in the central portion (where the discharge port 16 is provided) and the outer peripheral portion of the end plate 1 of the fixed scroll 3, and an oil sump 61 is formed around the central thickened portion 58. To do. The mixture of refrigerant gas and lubricating oil sent from the discharge port 16 to the discharge chamber 31 is separated into lubricating oil in the discharge chamber 31 by the action of the oil separation element 39, etc.
Accumulate in A part of the oil accumulated in the oil sump 61 is part of the oil supply holes 70, 7 provided in the end plate 1 of the fixed scroll 3.
Turning scroll and fixed scroll by 1, 72, 73
The sliding surfaces of the end plates 1 and 4 of the roll, the tip of the fixed scroll wrap 2 and the bottom of the revolving scroll wrap are directly lubricated to positively lubricate these sliding parts. It is something that can be made. The remaining oil is the vertical hole 62 and the horizontal hole 63 provided in the end plate 1 and the through hole 36 provided in the frame 9.
Is sent to the lower motor chamber 43b through the oil draining holes and the connecting pipe 52 and is stored in the chamber bottom. On the other hand, the gas from which the oil has been separated passes through the round holes provided in the outer peripheral portion of the end plate 1 of the fixed scroll and the frame 9 or the discharge gas passages 65 and 66 in the shape of a square notch, and the upper gas. Flows into the chamber 43a.

The force pressing the swivel scroll against the fixed scroll is applied to the back pressure hole 1 provided in the end plate 4 of the swivel scroll.
It is obtained by the gas pressure introduced from No. 7 and the hydraulic pressure (almost discharge pressure) that has flowed into the engaging portion of the orbiting scroll 5 and the crankshaft 8 through the oil lift hole 19. The back pressure chamber 25 needs to be kept at an intermediate pressure, and is sealed to other high pressure portions such as the upper motor chamber 43a.

The lubricating oil supplied from the oil pumping hole 19 of the crankshaft 8 to the bearings 9a and 4a contains gas or liquid dissolved in the oil under high pressure, and the back pressure chamber 25
It is conceivable that these may be separated from the oil leaked into the inside of the back pressure chamber 25 to increase the pressure in the back pressure chamber 25. However, by adjusting the bearing gap or the length of the bearing, the leak amount can be suppressed to a certain limit, and the back pressure can be maintained at a predetermined pressure by moving the position of the back pressure hole 17 to a slightly lower pressure side.

With such a structure, mist-like oil is retained in the back pressure chamber 25, and the sliding surface of the Oldham ring 7 which is a rotation preventing member of the orbiting scroll 3 has a simple structure. It becomes possible to reliably perform lubrication and lubrication.

[0019]

As described above, according to the present invention, the space in which the rotation preventing member is arranged communicates with the compression chamber with a simple structure.
Because it is a closed space except that it is conducting in the passage,
The oil introduced into the space mixes with the refrigerant gas and becomes mist-like.
Spread all over the space, the rotation prevention member and
Keys and keys that are engaging parts for crawling or stationary members
It is possible to provide a highly reliable hermetic scroll compressor by promoting lubrication of the groove portion and suppressing seizure of the engaging portion, occurrence of stickiness, and the like.

[0020]

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a hermetic scroll compressor of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1, 4 ... End plate, 2, 5 ... Wrap, 3 ... Fixed scroll,
6 ... Orbiting scroll, 8 ... Crank shaft, 9 ... Frame, 13 ... Chamber, 30 ... Lid chamber, 31 ... Discharge chamber, 32 ... Oil reservoir, 35, 70-73 ... Oil supply hole.

Front page continuation (72) Inventor Masato Ikegawa 502 Jinrachicho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hitachi, Ltd. 56) References JP 54-81513 (JP, A) JP 55-64181 (JP, A) JP 55-46708 (JP, U)

Claims (4)

(57) [Claims] [1 claim] and end plate, a fixed scroll member and the orbiting scroll member comprising a spiral wrap provided upright on the end plate, engaging with the wrap on the inside with one another, this
Orbiting scroll rotation pivoted movement blocking state of members, and the compression mechanism unit to perform compression of the fluid, in the scroll compressor of matches and motor in a closed container for driving the on the back portion of the orbiting scroll provided, the dense <br/> the closed container interior space is pressure to seal, the communication through the compression chamber and the guide path formed by both scroll members, the suction pressure and discharging intermediate pressure of the pressure a space is maintained, and bicycles prevention member you block the rotation of this arrangement in the space has been said orbiting scroll, said sealed vessel
Supply the lubricating oil accumulated in the space to the space maintained at the intermediate pressure
A hermetic scroll compressor provided with a refueling means . 2. The method according to claim 1, wherein the closed container is provided.
And the space where the lubricating oil is stored and the compression mechanism
The fluid is sealed through the space that stores this lubricating oil.
It is configured to be discharged from the container, and the oil supply means is
Is maintained at the intermediate pressure from the space where the lubricating oil is stored.
A hermetic scroll compressor that supplies lubricating oil to the space . 3. The refueling means according to claim 2,
A passage provided inside the shaft that drives the orbiting scroll.
Closed type scroll compressor. 4. The pressure according to claim 1, which is maintained at the intermediate pressure.
Together with the shaft that drives the orbiting scroll in the space
A rotating balance weight is attached to this shaft.
Closed type scroll compressor.