JPH08261177A - Scroll compressor - Google Patents

Abstract

PURPOSE: To surely perform supplying oil to a bearing part by providing a supply oil part of passing through inside a crankshaft from a lubricating oil part to communicate with a space in its end part, providing a supply oil path of passing in a turn scroll end plate from this space to communicate with a low pressure part to have a throttle part in the halfway, and providing a supply oil path of utilizing centrifugal pump action. CONSTITUTION: The first supply oil path 22 communicates through a crankshaft upper end part space 2h with a supply oil path 2f provided in a turn scroll end plate 2a, and the supply oil path 2f is opened to an end plate sliding surface of a fixed/turn scroll 1, 2. The second supply oil path is formed to pass in the turn scroll end plate 2a from the crankshaft end part space 2h to open a sliding part of a fixed/turn scroll end plate so as to communicate with a back pressure chamber 9. In a spiral supply oil groove 30a in an internal surface of a turn bearing part 30, viscous pump action acts in a direction of promoting supplying oil according to rotating a crankshaft 6, to provide a circumferential groove 31b in a position opposed to the third supply oil path 22b in a bearing surface lower part of a main bearing part 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor suitable as a refrigerant compressor for refrigeration and air conditioning, or a compressor for air and other gases, and more particularly to an oil supply structure thereof.

[0002]

2. Description of the Related Art An oil supply structure for a scroll compressor having a fixed scroll and an orbiting scroll, in which a central bearing portion is kept at a discharge pressure by a sealing member on the back side of the orbiting scroll, is disclosed in JP-A-60-224988. Has been done. This is a system in which the discharge pressure is in a closed container, the crankshaft and each bearing are installed in an atmosphere of discharge pressure, and each bearing is lubricated by the centrifugal pump action of the eccentric hole provided in the crankshaft. The lubricating oil after refilling the parts is circulated within the discharge pressure in the closed container.

In the conventional one in which the bearing portion is lubricated by the eccentric hole provided in the crankshaft, the eccentric hole provided in the crankshaft is put into the lubricating oil to obtain a centrifugal pump action, so that the center of rotation of the crankshaft is set vertically. It is used only as a vertical structure.

[0004]

In the case of a scroll compressor, it is common to have a vertical structure in which the compression mechanism part is located above and the electric motor part is located below. In order to obtain the pumping capacity of the centrifugal pump required for refueling the bearing portion located on the upper side of the crankshaft, it is necessary to form the refueling passage formed in the crankshaft with a predetermined eccentric amount. Therefore, it was necessary to increase the outer diameter of the crankshaft in order to obtain the capacity of a centrifugal pump. Especially when the scroll compressor is used for variable speed specifications, the eccentricity that can ensure the centrifugal pump capacity at low speed cannot be secured due to the outer diameter dimension of the crankshaft, and the operating range on the low speed side is limited. was there.

An object of the present invention is to provide a scroll compressor which can reliably supply oil to the bearing portion even when the compressor is rotating at a low speed.

Another object of the present invention is to provide a scroll capable of improving refueling ability without thickening the crankshaft.
To get the Le compressor.

Still another object of the present invention is to provide a scroll capable of reliably supplying oil to a bearing portion even in a horizontal type scroll compressor having a crankshaft horizontally arranged.
To get the Le compressor.

[0008]

In order to achieve the above object, a first feature of the present invention is to provide a fixed scroll and an orbiting scroll, a crankshaft for orbiting the orbiting scroll, and a main bearing portion for the crankshaft. In the scroll compressor configured to include a compression mechanism portion having a main frame supported via the compression mechanism portion, and the compression mechanism portion, which is maintained at a discharge pressure and includes a lubricating oil portion, A first oil supply passage from the lubricating oil portion in the crankshaft to the space at the end of the crank portion, and from the crank end space to the low pressure portion through the swivel end plate. A second oil supply passage having a throttle portion for narrowing the passage area in the middle and the first oil supply passage opened to the outer peripheral surface of the crankshaft from the middle to utilize the centrifugal pump action by the rotation of the crankshaft. In further comprising a third oil supply passage for supplying lubricating oil to the bearing portion.

A second feature of the present invention is that a fixed scroll and an orbiting scroll, and a compression chamber formed by meshing the wraps of the fixed scroll and the orbiting scroll,
A compression mechanism unit that includes a crankshaft that causes the orbiting scroll to make an orbiting motion through a rotation bearing unit, and a main frame that supports the crankshaft through a main bearing unit, an electric motor unit that drives the compression mechanism unit, and the In a scroll compressor configured to house a compression mechanism section and an electric motor section, which is maintained at a discharge pressure and has a lubricating oil section, a scroll compressor that passes through the crankshaft from the lubricating oil section under the discharge pressure. A first oil passage communicating with the space of the end portion of the crank, and a sliding portion between the end portion space of the crank portion and the end plate of the turning scroll through the inside of the end plate of the turning scroll and the end plate of the fixed scroll. The main bearing portion is opened from the middle of the first oil supply passage and the second oil supply passage that opens to the low pressure portion and then to the outer peripheral surface of the crankshaft by utilizing the centrifugal pump action by the rotation of the crankshaft. And a lubricant third oil supply passage for supplying, said the second oil supply passage lies in having a throttle portion for throttling the passage area in the middle thereof.

A third feature of the present invention is that a fixed scroll and an orbiting scroll having an end plate and a spiral wrap standing upright on the end plate in a closed container, and these fixed scroll and the orbiting scroll are bitten with the wraps inside. A compression mechanism section including a compression chamber formed together, a crankshaft for orbiting the orbiting scroll through an orbiting bearing section, and a main frame for supporting the crankshaft through a main bearing section, and the compression mechanism. Part for driving the motor part, the compression mechanism part, and the motor part, and a closed container communicating with the discharge port of the compression mechanism part to maintain discharge pressure and having a lubricating oil part at the bottom thereof, and an orbiting scroll. And a fixed pressure scroll and a main frame which are formed on the back surface of the orbiting scroll and are constituted by a back pressure chamber which has a pressure between discharge pressure and suction pressure. In the roll compressor, a seal member provided between the orbiting scroll and the main frame for partitioning the back pressure chamber and each bearing portion to make each bearing portion substantially discharge pressure, and a sealing member under the discharge pressure. A first oil supply passage that extends from a certain lubricating oil portion through the crankshaft to a space at the end of the crank portion; and a swirl scroll end plate that passes through the inside of the swivel scroll end plate from the crank portion end space. Rotation of the crankshaft opening in the outer peripheral surface of the crankshaft from the middle of the first oil supply passage and the second oil supply passage that opens to the sliding portion with the fixed scroll end plate and then leads to the back pressure chamber And a third oil supply passage for supplying lubricating oil to the main bearing portion by utilizing the centrifugal pump action by the above, and the second oil supply passage has a throttle portion in the middle thereof for narrowing the passage area.

A fourth feature of the present invention is to provide a fixed scroll and an orbiting scroll, a crankshaft arranged in a horizontal direction for orbiting the orbiting scroll, and a crank portion side of the crankshaft supported via a main bearing portion. In a scroll compressor having a horizontal structure, which includes a main frame that accommodates these devices and a sealed container that is maintained at a discharge pressure and that has a lubricating oil portion, an anti-crank part of a crankshaft attached to the sealed container. From the sub-bearing part that supports the side end part and the lubricating oil part under the discharge pressure, to the space at the end part of the crank part through the oil supply pipe formed in the closed container and the oil supply passage formed in the crankshaft. A second oil supply passage having a first oil supply passage and a throttle portion that extends from the end space of the crank portion into the low pressure portion through the inside of the swivel end plate and narrows the passage area in the middle thereof. A third oil supply passage opening from the middle of the first oil supply passage to the outer peripheral surface of the crankshaft to supply lubricating oil to the main bearing portion by utilizing a centrifugal pump action by rotation of the crankshaft; And a fourth oil supply passage which opens from the middle of the oil supply passage to the outer peripheral surface of the crankshaft and supplies the lubricating oil to the auxiliary bearing portion by utilizing the centrifugal pump action by the rotation of the crankshaft.

The throttle portion is, for example, a slide between a swirl scroll end plate and a fixed scroll end plate, in which an oil supply passage formed in the swirl scroll end plate of the second oil supply passage opens. It is composed of moving surfaces.

Further, a turning scroll of the second oil supply passage.
The opening end of the oil supply passage formed in the end plate is swivel scrolled.
The fixed scroll within the range of movement by the swiveling motion of the lever.
If a groove passage in the circumferential direction is provided on the sliding surface of the end plate, and the groove passage and the opening of the oil supply passage provided on the end plate of the orbiting scroll are intermittently communicated by the orbiting motion of the orbiting scroll. The sliding surfaces of the both end plates can be reliably lubricated.

The first oil supply passage formed in the crankshaft is formed obliquely with respect to the crankshaft so that the upstream side thereof is on the crankshaft center side and the position above the crankshaft center is eccentric to the crankshaft center. It is better to have a larger centrifugal pump action.

Further, in the case where a sub-bearing portion for supporting one end side of the crank shaft is provided on the side of the crank shaft opposite to the main bearing portion of the crank shaft, the auxiliary bearing portion is provided from the middle of the first oil supply passage to the outer peripheral surface of the crank shaft. A fourth oil supply passage is provided which is opened and supplies the lubricating oil to the sub-bearing portion by utilizing the centrifugal pump action by the rotation of the crankshaft.

Also, preferably, the space between the orbiting bearing portion and the main bearing portion is communicated with the space inside the closed container, and the lubricating oil supplied to the space is discharged into the space inside the closed container. An oil drain hole is formed in the main frame.

[0017]

[Function] While the scroll compression mechanism is housed in the closed container to maintain the discharge pressure in the closed container, the fixed scroll, the orbiting scroll and the main frame form a back pressure chamber on the back surface of the orbiting scroll. The back pressure chamber is separated from the bearing portion and the back pressure chamber on the outside thereof by a seal member provided between the back pressure chamber and the bearing portion. Therefore, the bearing portion has a pressure substantially equal to the discharge pressure, and the back pressure chamber on the outer peripheral side of the seal member is maintained at a pressure between the suction pressure and the discharge pressure by the intermediate hole communicating with the compression chamber.

The lubricating oil portion under discharge pressure in the closed container and the back pressure chamber of intermediate pressure are communicated with each other by the first and second oil supply passages to form a differential pressure oil supply passage. Furthermore, the main bearing portion is lubricated by the third oil supply passage radially branched from the oil supply passage of the crankshaft.

The throttle portion provided in the second oil supply passage is made sufficiently smaller than the passage area of the first oil supply passage formed in the crankshaft, so that the oil pressure of the lubricating oil in the oil supply passage in the crankshaft is almost equal to the discharge pressure. Maintained.

The lubricating oil differentially supplied from the second oil supply passage to the sliding surfaces of the end plates of the orbiting scroll and the fixed scroll flows into the back pressure chamber provided with the Oldham ring, so that the sliding surface of the Oldham ring slides. Lubricate.

If the oil supply passage in the crankshaft is eccentric with respect to the center of rotation of the crankshaft, for example, in the direction of the crank portion, an eccentric oil supply passage can be formed without increasing the diameter of the crankshaft. With this configuration, when the lubricating oil flows through the oil supply passage in the crankshaft, the lubricating oil is increased in hydraulic pressure by the centrifugal pump action. In addition, the third that branches in the radial direction
Alternatively, the hydraulic pressure of the lubricating oil can be further increased by the centrifugal pump action even in the fourth oil supply passage.

Even in a scroll compressor having a horizontal structure in which the crankshaft is arranged in the horizontal direction and the crankshaft and each bearing are installed in an atmosphere of discharge pressure, the lubricating oil and the discharge under the discharge pressure in the closed container are discharged. Since the back pressure chamber having an intermediate pressure between the pressure and the suction pressure is communicated with the first and second oil supply passages to form the differential pressure oil supply passage, it is possible to perform oil supply by combining differential pressure oil supply and centrifugal oil supply. Reliable refueling can be performed.

[0023]

Embodiments of the scroll compressor of the present invention will be described below in detail with reference to the drawings.

1 and 2 show a scroll compressor having a vertical structure according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a fixed scroll, which has an end plate 1a and a spiral wrap 1b which stands upright on the end plate 1a, and has a suction port 1c on the outer peripheral side of the wrap and a discharge port on the central part of the wrap. It has a port 1d. Reference numeral 2 denotes an orbiting scroll, which has an orbiting scroll end plate 2a and a spiral wrap 2b standing upright on the end plate 2a, and an orbiting bearing portion 30 at the center of the back surface of the wrap. The fixed scroll 1 and the orbiting scroll 2 mesh with each other with the wraps on the inside to form a compression chamber, and the end plate 2a at a position close to the side surface of the wrap 2b of the orbiting scroll is provided with a small-diameter intermediate hole 2e. The chamber is communicated with the back pressure chamber 9 provided on the rear side of the turning scroll. 3 is the main frame, its side surface (outer peripheral surface)
A gas passage 3d is provided in the main frame, and the fixed scroll 1 is fixed to the main frame by a plurality of bolts, and the orbiting scroll end plate 2a is fixed to the fixed scroll 1 and the main frame pedestal portion 3.
It is sandwiched by a. A main bearing portion 31 that supports the crankshaft 6 is provided in the central portion of the main frame 3. The back pressure chamber 9 is formed by the back surface of the orbiting scroll 2 and the main frame 3, and the back pressure chamber 9 is formed by the main frame pedestal portion 3a formed in a cylindrical shape, and the inner space 9a and the outer space 9 are formed.
It is partitioned into two spaces b, and both spaces 9a and 9b communicate with each other through a gap between the back surface of the orbiting scroll 2 and the pedestal surface 3a. The inner space 9a of the back pressure chamber 9 communicates with the compression chamber through the intermediate hole 2e. Reference numeral 4 denotes a seal member held in a ring-shaped groove 3b provided in the main frame 3 at a position between the back pressure chamber 9 and the main bearing portion 31, and closely adheres to the collar portion 2d of the orbiting scroll 2 which is smoothly processed. It is provided so as to slide. An oil drainage hole 19 communicating with a space below the main frame 3 is provided at a position between the seal member 4 and the main bearing portion 31, and an oil drainage pipe 20 is attached to the oil drainage hole 19.

The seal member 4 is, for example, a seal ring made of a fluorine resin such as tetrafluoroethylene resin or a polyimide resin. The seal member 4 is required depending on the internal condition of the compressor during operation. As long as it can be obtained.
Further, although one seal member is shown as an example, a plurality of seal members may be used in order to enhance the sealing property.

An Oldham ring 5 is provided in a space 9b outside the back pressure chamber 9 and prevents the orbiting scroll 2 from rotating with respect to the fixed scroll 1. The Oldham ring 5 has two pairs of orthogonal keys, and a pair of key grooves (not shown) provided on the end plate 2a of the orbiting scroll and a pair of key grooves provided outside the main frame pedestal portion 3a. 3c is engaged. The crankshaft 6 is supported by a main bearing portion 31 and a sub bearing portion 32 which are vertically arranged with the electric motor 7 interposed therebetween, and the sub bearing portion 32 is attached to the body portion 14a of the hermetically sealed container 14 via the sub frame 8. .

The crankshaft 6 has an oil supply passage 22 provided obliquely in the eccentric direction of the crank portion 6a with respect to the shaft center (rotation center), and the upper end of the oil supply passage 22 is above the crank portion. It has an opening on the end face. Further, the lower end portion of the oil supply passage 22 opens through the oil supply pipe 21 to the lubricating oil portion below the closed container. The oil supply passage 22 and the oil supply pipe 21 form a first oil supply passage. Further, an oil supply hole (third oil supply path) 22b that branches in the crankshaft radial direction from the oil supply passage 22 toward the lower end side of the main bearing portion 31 is provided, and the main bearing portion 31 has the first and second oil supply holes. The lubricating oil in the lower part of the closed container is supplied through the third oil supply passage. The orbiting scroll is supported by the crank portion 6a of the crankshaft via the orbiting bearing portion 30, and the orbiting bearing portion 30 uses the space 2h on the upper end surface of the crankshaft via the first oil supply passages 21 and 22. Be refueled. The lubricating oil supplied to the crank part end space is supplied to the entire bearing part 30 via the spiral groove 30a formed on the inner peripheral surface of the orbiting bearing part 30, and the crankshaft 6 and the crankshaft 6 are provided in the space below the bearing part 30. Thrust receiving portion 6b formed integrally
After being lubricated, the oil is returned to the lubricating oil portion under the closed container through the oil drain hole 19 and the oil drain pipe 20.

The electric motor 7 comprises an electric motor stator 7a and an electric motor rotor 7b fixed to the crank jig 6. The sub frame 8 is fixed to the sub frame support 10 attached to the body portion 14a of the closed container 14 by several bolts so that the sub frame 8 can be aligned in the radial direction. The center is aligned with the axis of the main bearing portion 31. The inner surface of the sub-bearing portion 32 is a sliding bearing surface, and the outer surface of the sub-bearing portion 32 has a spherical shape and is fitted into the spherical housing of the sub-frame 8 and has a centering function. Oil is supplied to the sub bearing portion 32 by a fourth oil supply passage 22a that is radially branched from the first oil supply passage 22.

Reference numeral 11 is a main balance weight fixed to the crankshaft 6 at a position above the electric motor 7, and reference numeral 12 is an auxiliary balance weight fixed to the electric motor rotor 7b.
Reference numeral 13 denotes a lubricating oil portion of lubricating oil stored in the lower portion of the closed container 14, and the inside of the closed container 14 is maintained at a discharge pressure. The main frame 3, the electric motor stator 7a, and the sub-frame support 10 are fixedly supported on the closed container body 14a.

Reference numeral 16 is a suction port of the compressor, 17 is a discharge port,
Each of these penetrates the closed container 14. A gas guide 18 is attached to the closed container 14. The oil supply pipe 21 is press-fitted into the center of the lower end of the crankshaft 6, communicates with the oil supply passage 22, and the lower end of the oil supply pipe 21 opens into the lubricating oil portion 13.

As shown in FIG. 2, the first oil supply passage 22 communicates with the oil supply passage 2f provided in the orbiting scroll end plate through the crankshaft upper end space 2h, and the oil supply passage 2f and the fixed scroll 1 and the orbiting scroll. The second end plate has an opening on the sliding surface.
This opening part intermittently communicates with the ring-shaped groove passage 1e provided on the end plate surface of the fixed scroll with the orbiting motion. The groove passage 1e forms a space closed by the fixed scroll 1 and the end plate surface of the orbiting scroll.

The crank portion end space 2h passes through the swivel scroll end plate to open at the sliding portion between the swivel scroll end plate and the fixed scroll end plate, and then to the back pressure chamber 9. A second oil supply passage is formed so as to communicate with each other.

The spiral oil supply groove 30a formed on the inner surface of the slewing bearing portion 30 is constructed so that a viscous pump action works in the direction of promoting oil supply as the crankshaft 6 rotates. The main bearing portion 31 has an inner surface as a sliding bearing surface, and a lower surface of this bearing surface is provided with a circumferential groove 31b at a position facing the third oil supply passage 22b. The spiral oil supply grooves 31a communicate with each other.
The spiral groove 31a is also provided so that a viscous pump action works in a direction of promoting oil supply as the crankshaft 6 rotates.

The crankshaft 6 has a thrust receiving portion 6b.
It is supported by a thrust bearing 34 provided on the upper end side of the main bearing portion 31 via. On the bearing surface of the thrust bearing 34, the radial oil supply passage 3 communicating with the oil supply groove 31a of the main bearing portion is formed.
4a is provided. The oil supply groove 30a of the slewing bearing and the oil supply groove 31a of the main bearing portion communicate with the space inside the seal member 4.

Next, the operation of the above embodiment will be described.
The crankshaft 6 is rotated by the rotation of the electric motor rotor 7b of the electric motor unit 7, and the orbiting scroll 2 orbits due to the intervention of the Oldham ring 5, and the refrigerant gas flows from the suction port 16 through the suction port 1c and is compressed. Be sucked into the room. The refrigerant gas is compressed as the orbiting scroll 2 orbits, and is discharged from the discharge port 1d to the upper space of the fixed scroll 1. During this compression operation, a part of the appropriately pressurized intermediate-pressure refrigerant gas flows into the space 9a inside the back-pressure chamber 9 through the intermediate hole 2e to keep the back-pressure chamber 9 at the intermediate pressure. At the time of start-up, the orbiting scroll 2 is supported by the main frame pedestal portion 3a, so the inner space 9a is in a closed state, and the pressure in the inner space 9a rapidly rises to a predetermined pressure, and the orbiting scroll 2 is rotated. Push up. Orbiting scroll end plate 2
Since a is sandwiched between the pedestal portion 3a of the main frame 3 and the fixed scroll 1, the orbiting scroll 2 is pressed against the fixed scroll 1 without tilting at startup, and the back pressure chamber outer space 9b also rises to a predetermined pressure.

The pressure (discharge pressure) in the closed container 14 rises as the operation proceeds, and the space inside the seal member 4 is maintained at this discharge pressure. The resultant force of the discharge pressure inside the seal member 14 and the pressure inside the back pressure chamber 9 acts as a force for pressing the orbiting scroll 2 against the fixed scroll 1. Since the thrust force on the orbiting scroll 2 exceeds the magnitude of the total thrust force generated by the gas force in the compression chamber, the orbiting scroll 2 is pressed against the fixed scroll 1 side and a stable compression operation is performed. In order to obtain the necessary thrust force, the pressure in the back pressure chamber can be set low and the inner diameter of the seal member 4 can be increased.

The high-pressure gas discharged from the discharge port 1d into the upper space of the fixed scroll 1 flows into the upper space of the electric motor 7 through the gas passage 3d on the side surface of the main frame 3, and a part of the gas guide 18 is guided to the lower space of the electric motor 7 from a passage provided on the side surface of the electric motor 7, and then flows into the upper space of the electric motor 7 again, where the refrigerant gas cools the electric motor 7 and the lubricating oil in the refrigerant gas is separated. Then, the refrigerant gas flows out of the compressor through the discharge port 17. Some of the lubricating oil becomes so-called oil rise and flows out of the machine together with the refrigerant gas, but returns to the suction port 16 of the scroll compressor together with the refrigerant gas again. On the other hand, the separated lubricating oil flows downward due to gravity and reaches the lubricating oil portion 13 below the closed container.

The lubricating oil flows from the lubricating oil portion 13 through the oil supply pipe 21 fixed to the crankshaft 6 through the oil supply passage 22 in the crankshaft 6 due to the pressure difference between the discharge pressure and the back pressure chamber pressure, and the crankshaft upper end surface space 2h. End plate of the fixed scroll 1 and the orbiting scroll 2 through the oil supply passage 2f provided in the end plate of the orbiting scroll and intermittently communicating with the ring groove 1e provided on the surface of the fixed scroll end plate with the orbiting motion. Lubricate the surface.
After that, the lubricating oil that has supplied the end plate surface is discharged to the outer space 9b of the back pressure chamber 9, lubricates the Oldham ring 5 provided in this space, passes through the gap between the orbiting scroll 2 and the main frame pedestal 3a, and After moving to the space 9a, it flows into the compression chamber through the intermediate hole 2e, and discharge port 1d together with the refrigerant gas.
Is discharged from.

The groove passage 1e on the end plate surface of the fixed scroll forms a space closed by the end plate surfaces of the fixed scroll 1 and the orbiting scroll 2. The opening of the oil supply passage 2f of the orbiting scroll end plate functions as a throttle portion of the differential pressure oil supply passage (second oil supply passage), and the passage area of this throttle portion is the oil supply passage in the crankshaft 6 (first oil supply passage). ) 22, the passage area is sufficiently narrowed so that the oil pressure of the lubricating oil does not decrease in the oil supply passage 22 in the crankshaft 6, and the oil supply passage 22 is
Since it is provided obliquely in the eccentric direction of the crank pin portion 6a with respect to the rotation center of the lubricating oil, the lubricating oil is fed by the differential pressure to the oil supply passage 2
When ascending in 2, the lubricating oil is subjected to a centrifugal pump action in the oil supply passage 22, and the oil pressure of the lubricating oil becomes higher than the discharge pressure.

In the main bearing portion 31, the first oil supply passage 22,
It is supplied to the circumferential groove 31b through the third oil supply passage 22b, and is lubricated from the circumferential groove 31b through the spiral oil supply groove 31a. This spiral groove 31a has a crankshaft 6
Since the viscous pump action is provided in the direction of promoting the oil supply with the rotation of the, the oil supply capacity can be supplemented within the bearing surface.

The thrust bearing 34, which supports the crankshaft 6, is lubricated with the lubricating oil that has lubricated the main bearing portion 31 through a radial oil passage 34a that communicates with the oil groove 31a of the main bearing portion. The lubricating oil that has supplied the main bearing reaches the space inside the seal member 4. The sub bearing portion 32 is the fourth oil supply passage 22.
The oil is supplied from a and the lubricating oil flows back to the lubricating oil portion 13.

The orbiting bearing portion 30 is lubricated through the spiral oil supply groove 30a through the first oil supply passage and the space 2h at the upper end of the crankshaft. This spiral groove 31a
Is provided so that the viscous pumping action works in the direction of promoting oil supply as the crankshaft 6 rotates, so that the oil supply capacity can be supplemented within the bearing surface. The lubricating oil that has supplied the orbiting bearing portion 30 reaches the space inside the seal member 4.

The lubricating oil that has supplied the orbiting bearing 30 and the main bearing portion 31 is guided to the oil drain pipe 20 through the oil drain hole 19 provided in the main frame 3 that has reached the space inside the seal member 4, and the sealed container 14 is filled with the lubricating oil. It falls by gravity along the inner wall surface.

Thus, the main bearing portion 31 and the slewing bearing portion 30 are
Since the lubricating oil that has been supplied drops to the lower portion of the closed container 14 through a route different from the refrigerant gas passage, it is circulated to the lubricating oil portion 13 below the closed container 14 without being mixed with the refrigerant gas and flowing out of the machine.

Another embodiment of the present invention will be described with reference to FIGS. In the figure, the point different from the first embodiment is that the oil supply passage (first oil supply passage) 22 in the crankshaft is provided perpendicularly to the rotation center of the crankshaft 6, and other configurations are the same as those of the first embodiment. Is the same. In the case of this embodiment, since the oil supply passage 22 in the crankshaft is provided at the rotation center of the crankshaft 6, the productivity of the crankshaft 6 is improved.

Lubricating oil is supplied to the crankshaft oil supply passage 2 by the pressure difference.
2 and can maintain the hydraulic pressure of the lubricating oil in the oil supply passage 22 of the crankshaft at the discharge pressure as in the first embodiment, the third oil supply passage 22 radially branched from this oil supply passage.
b, the lubricating oil can be guided to the fourth oil supply passage 22a.
In the oil supply passages 22a and 22b provided in the radial direction, the centrifugal pump action by the rotation of the crankshaft 6 is exerted to raise the hydraulic pressure of the lubricating oil to supply the bearing. Other operations are the same as those in the first embodiment.

A third embodiment of the present invention will be described with reference to FIGS. The figure shows an embodiment in which the present invention is applied to a scroll compressor having a horizontal structure. Note that FIG. 6 is a detailed view of the sub bearing portion of FIG.

As shown in the figure, the crankshaft 6 is arranged in the horizontal direction, and is the same as the vertical scroll compressor as shown in FIG. 1 except for the portions described below.

In the horizontal scroll compressor, the electric motor rotor 7b is attached to the electric motor stator 7a with a slight shift on the main bearing portion 31 side. Further, when the crankshaft 6 moves in the horizontal direction, the end surface of the crankshaft 6 on the side of the crank portion 6a contacts the end plate surface of the orbiting scroll in the orbiting bearing, and the upper end surface of the thrust receiving portion 6b of the crankshaft and the orbiting scroll. Both gaps are set so as not to come into contact with the collar portion 2d.

As with the vertical structure, the crankshaft 6 has the main bearing portion 3 provided on the main frame 3 which is positioned with the electric motor 7 interposed therebetween.
1 and a sub bearing 32 provided on the sub frame 8.
The sub bearing 32 has a sliding bearing surface on the inner surface, and has a spiral oil supply groove 32a on the sliding bearing surface. The sub bearing 32 has a spherical outer surface and is fitted in the spherical housing of the sub frame 8 with a minute gap, and has a centering function. Similarly to the vertical structure, the sub-frame 8 has the axis of the sub-bearing portion 32 aligned with the axis of the main bearing portion 31, and is fixed to the sub-frame support 10 with several bolts. The oil supply pipe 21 is press-fitted into the sub-frame 8 and communicates with the oil supply passage 22 via the end surface of the crankshaft 6 on the side of the sub-bearing portion 32. The lower end of the oil supply pipe 21 opens into the lubricating oil 13.

Next, the operation of this embodiment will be described. The refrigerant gas compression mechanism is the same as that of the vertical scroll compressor, and thus the description thereof is omitted. However, the crankshaft 6 is supported horizontally, and its own weight and the like are supported by the main bearing portion 31 and the sub bearing portion 32. The electric motor rotor 7b is the electric motor stator 7a.
On the other hand, since the crankshaft 6 is assembled on the side of the main bearing part with a slight shift, the crankshaft 6 receives a magnetic thrust in the direction on the side of the sub bearing part 32. Due to this magnetic thrust, the crankshaft 6 comes into close contact with and slides on the thrust bearing 34 provided on the end side of the main bearing portion 31 during operation. Even when the crankshaft 6 moves in the horizontal direction during a transition period such as startup, the end face of the crankshaft 6 on the crank portion 6a side comes into contact with the orbiting scroll end plate surface 2g first. The flange portion 2d, which is a sliding surface with respect to 4, is not scratched.

Due to the pressure difference between the discharge pressure and the back pressure chamber pressure, the lubricating oil passes through the oil supply pipe 21 attached to the auxiliary frame 8 to the end surface of the auxiliary bearing portion 32 of the crankshaft 6 from the lubricating oil portion 13 at the lower part of the hermetic container. It is guided to the oil supply passage 22 of the crankshaft through the space. The sub bearing portion 32 is supplied with oil from the end face space of the sub bearing portion through a spiral oil supply groove 32a. The spiral groove 32a is provided so that the viscous pump action works in the direction of promoting the oil supply with the rotation of the crankshaft 6, and the oil supply capacity can be supplemented within the bearing surface.

The oil supply to the main bearing portion 31, the slewing bearing portion 30 and the like is the same as in the vertical scroll compressor shown in the first embodiment, and the description thereof will be omitted.

By constructing the oil supply passages as in the first to third embodiments described above, the lubricating oil maintained at the discharge pressure by the differential pressure in both the vertical scroll compressor and the horizontal scroll compressor. Can be introduced into the oil supply passage of the crankshaft, and the lubricating oil is introduced into the third oil supply passage radially branched from the first oil supply passage in the crankshaft and lubricated by the centrifugal pump action by the rotation of the crankshaft. The oil pressure of oil can be increased to supply oil to the main bearing portion 31.

Further, since the oil supply passage formed in the end plate of the orbiting scroll is opened to the end plate surfaces of the orbiting scroll and the fixed scroll, the sliding surface of the end plate is differentially lubricated and further lubricated after the lubrication. With the structure in which the oil is discharged to the back pressure chamber incorporating the Oldham ring, the lubricating oil lubricates the sliding surface of the Oldham ring, enters the compression chamber through the intermediate hole 2e, and is discharged together with the refrigerant gas. Reflux to the lubricating oil section under the closed container. As described above, oil can be supplied to all sliding surfaces of the scroll compressor.

According to the present embodiment, since the differential pressure oil supply and the oil supply by the centrifugal pump action are combined, the oil supply method by only the centrifugal pump action does not allow the oil to be supplied to each sliding surface even at the low speed operation when the pump performance is lowered. As a result, it is possible to always reliably and reliably refuel the variable speed scroll compressor.

Further, the lubrication of each bearing portion is performed by adding a centrifugal pump action, and the lubrication of the scroll end plate surface or the like is divided only by differential pressure lubrication so that the bearing system and the end plate portion are separated. The amount of oil to be supplied can be set independently, and a sufficient amount of lubricating oil can be supplied to each sliding portion.

In the case of the horizontal scroll compressor, conventionally, the lubricating oil could not be introduced to the oil supply passage of the crankshaft, and the centrifugal pump action alone could not be used, but in the present invention, Since the lubricating oil can be introduced into the oil supply passage of the crankshaft by the differential pressure, it is possible to supply the oil with the combined differential pressure and centrifugal pump action as in the vertical scroll compressor.

Further, the structure is such that the oil supply passage in the crankshaft is eccentric in the crankpin direction with respect to the center of rotation of the crankshaft, so that the centrifugal force can be maintained when flowing through the oil supply passage without increasing the diameter of the crankshaft. The oil pressure of the lubricating oil can be increased by obtaining the pump action, and the oil pressure of the lubricating oil is increased by the centrifugal pump action even in the oil supply hole branched in the radial direction, so that the oil can be supplied to each bearing portion.

Further, in the present invention, it is possible to set the diameter of the oil supply passage in the crankshaft to a relatively large diameter with respect to the oil supply hole branched in the radial direction, and to obtain the centrifugal pump action in this thick portion. It is possible to improve the refueling performance.

[0061]

According to the present invention, the following effects can be obtained.
◆ (1) First and second oil supply passages that connect the lubricating oil under discharge pressure and a low pressure portion (for example, a back pressure chamber at an intermediate pressure) from the lubricating oil passage to each other are provided, and a throttle portion is provided in the second oil supply passage. Further, since the third oil supply passage branched in the radial direction from the oil supply passage provided in the crankshaft to the main bearing portion is provided, the differential pressure oil supply and the centrifugal pump operation can be used together for low speed oil supply. Since it is possible to reliably supply oil to each sliding surface even during operation, it is possible to always provide stable oil supply as a variable speed scroll compressor.

(2) Since the structure is such that the oil supply is also used by the differential pressure, the lubricating oil can be introduced into the oil supply passage of the crankshaft even in the case of a horizontal scroll compressor. The structure can be adopted, and similar to the vertical scroll compressor, reliable oil supply can be performed even at low speeds. As a result, for example, horizontal scroll compressors that share major components with vertical scroll compressors can also be used, and both horizontal scroll compressors and vertical scroll compressors can be produced by sharing production equipment and major components. It is also possible to do so.

(3) Since the main bearing part is the centrifugal pump oil supply and the end plate surface is the differential pressure oil supply, the oil supply system is divided, so that the oil supply amount of the main bearing part and the end plate part can be set independently, and each sliding part can be set. Can supply necessary and sufficient lubricating oil. Therefore, it is possible to prevent the sliding surface from being overheated due to insufficient lubrication and the performance of the scroll compressor from being deteriorated due to excessive lubrication.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll compressor showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a vertical cross-sectional view of a scroll compressor showing a second embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of FIG. 3;

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

6 is an enlarged view of a sub bearing portion of FIG.

[Explanation of symbols]

1: Fixed scroll, 1a: End plate, 1b: Wrap, 1
c: suction port, 1d: discharge port, 1e: groove passage,
2: orbiting scroll, 2a: end plate, 2b: wrap, 2
d: collar part, 2e: intermediate hole, 2f: oil supply passage, 2g: end plate surface, 2h: space at the top of crank jig, 3: main frame,
3a: Pedestal, 3b: Ring groove, 3c: Key groove, 3d: Gas passage, 4: Seal member, 5: Oldham ring, 6: Crank shaft, 6a: Crank part, 6b: Thrust receiving part,
7: electric motor part, 7a: stator, 7b: rotor,
8: sub-frame, 9: back pressure chamber, 10: sub-frame support,
11: Main balance weight, 12: Sub balance weight, 13: Lubricating oil part, 14: Airtight container, 14a: Body part,
16: suction port, 17: discharge port, 18: gas guide, 1
9: oil drain hole, 20: oil drain pipe, 21, 22: first oil feed passage (21 ... oil feed pipe, 22 ... oil feed passage), 22a: fourth oil feed passage, 22b: third oil feed passage, 22c : Oil supply line,
30: swivel bearing part, 30a, 31a, 32a: spiral groove, 31: main bearing part, 31b: circumferential groove, 32: sub bearing part, 34: thrust bearing, 34a: oil supply passage.

Front page continued (72) Inventor Hideyuki Ueda 390 Muramatsu, Shimizu City, Shizuoka Prefecture, Hitachi Air Conditioning Systems Division (72) Inventor Takeshi Hida, 390 Muramatsu, Shimizu City Shizuoka Prefecture, Hitachi Systems Co., Ltd.

Claims (12)

[Claims] 1. A compression mechanism section comprising a fixed scroll and an orbiting scroll, a crankshaft for orbiting the orbiting scroll, and a main frame for supporting the crankshaft via a main bearing section, and the compression mechanism section. In a scroll compressor that is housed and maintained at a discharge pressure and that is composed of an airtight container having a lubricating oil portion, the lubricating oil portion under the discharging pressure passes through the inside of the crankshaft and leads to the space at the end of the crank portion. A first oil supply passage, a second oil supply passage having a throttle portion that extends from the end space of the crank portion through the inside of the turning scroll end plate to a low pressure portion, and in the middle of which a passage area is narrowed; A third oil supply passage that opens from the middle of the oil supply passage to the outer peripheral surface of the crankshaft and supplies the lubricating oil to the main bearing portion by utilizing the centrifugal pump action by the rotation of the crankshaft. Scroll compressor that. 2. A fixed scroll and an orbiting scroll, a compression chamber formed by meshing the wraps of the fixed scroll and the orbiting scroll, a crankshaft for orbiting the orbiting scroll via an orbiting bearing portion, and the crank. A compression mechanism section including a main frame that supports a shaft via a main bearing section, an electric motor section that drives the compression mechanism section, and a lubricating oil section that accommodates the compression mechanism section and the electric motor section and is maintained at a discharge pressure. A scroll compressor constituted by a closed container having: a first oil supply passage that extends from a lubricating oil portion under the discharge pressure to a space at an end portion of a crank portion through the crankshaft; and an end portion of the crank portion. From the space, it passes through the inside of the swivel end plate and opens to the sliding part between the swivel end plate and the fixed scroll end plate, and then to the low pressure part. And a second oil supply passage that opens from the middle of the first oil supply passage to the outer peripheral surface of the crankshaft, and supplies the lubricating oil to the main bearing portion by utilizing the centrifugal pump action by the rotation of the crankshaft. And a throttle section for narrowing the passage area in the middle of the second oil supply channel. 3. A fixed scroll and an orbiting scroll having an end plate and a spiral wrap standing upright on the end plate in a closed container, and a compression chamber formed by meshing the fixed scroll and the orbiting scroll with the wrap inside. When,
A compression mechanism unit that includes a crank shaft that causes the orbiting scroll to orbit through a orbiting bearing unit, and a main frame that supports the crank shaft through a main bearing unit, an electric motor unit that drives the compression mechanism unit, and the compression unit. The mechanism and the electric motor are housed and communicated with the discharge port of the compression mechanism to maintain the discharge pressure, and a closed container having a lubricating oil part at the lower part, and the orbiting scroll, the fixed scroll and the main frame are used for the orbit. A scroll compressor formed by a back pressure chamber formed on the back surface of a scroll to have a pressure between discharge pressure and suction pressure, wherein the back pressure chamber and each bearing are provided between an orbiting scroll and a main frame. And a seal member for partitioning the bearing part into almost each discharge pressure, and a crank part passing through the crankshaft from a lubricating oil part under the discharge pressure. A first oil supply passage communicating with an end space and an opening at a sliding portion between the crank scroll end plate and the orbiting scroll end plate passing through the inside of the orbiting scroll end plate from the crank end space. Further, after that, the second oil supply passage communicating with the back pressure chamber and the first oil supply passage are opened from the middle to the outer peripheral surface of the crankshaft, and the centrifugal pump action by the rotation of the crankshaft is utilized to the main bearing portion. A scroll compressor, comprising: a third oil supply passage for supplying lubricating oil, wherein the second oil supply passage has a throttle portion for narrowing a passage area in the middle thereof. 4. The swirl scroll end plate and the fixed scroll end, wherein the throttle portion has an opening for an oil supply passage formed in the swirl scroll end plate of the second oil supply passage. A scroll compressor comprising a sliding surface with a plate. 5. The method according to claim 3, wherein the opening end of the oil supply passage formed in the swivel scroll end plate of the second oil supply passage is moved by the swivel motion of the swirl scroll. A circumferential groove passage is provided on the sliding surface of the fixed scroll end plate, and the groove passage and the opening of the oil supply passage provided on the end plate of the orbiting scroll are intermittently communicated by the orbiting motion of the orbiting scroll. A scroll compressor having a configuration. 6. The Oldham ring according to claim 3, wherein an Oldham ring is provided in the back pressure chamber, and the sliding surface of the Oldham ring is lubricated by the lubricating oil differentially fed from the second oil feed passage. A scroll compressor. 7. The crank according to claim 3, wherein the first oil supply passage formed in the crankshaft is located at the upstream side of the crankshaft center and above the first oil supply path at a position eccentric to the crankshaft center. A scroll compressor characterized by being formed obliquely to the axis. 8. The crankshaft according to claim 3, wherein a sub-bearing portion for supporting one end side of the crankshaft is provided on an opposite side of the main bearing of the crankshaft from a crank portion side, and an outer periphery of the crankshaft is provided in the middle of the first oil supply passage. A scroll compressor which is provided with a fourth oil supply passage which is opened in a surface and which supplies a lubricating oil to the sub bearing by utilizing a centrifugal pump action by rotation of a crankshaft. 9. The space according to claim 3, wherein the space between the orbiting bearing portion and the main bearing portion communicates with the space inside the hermetic container, and the lubricating oil supplied to the space is supplied to the space inside the hermetic container. A scroll compressor characterized in that an oil discharge hole for discharging is formed in the main frame. 10. The scroll compression system according to claim 3, wherein the first oil supply passage includes an oil supply pipe connecting one end of an oil supply passage formed in a crankshaft and the lubricating oil portion. Machine. 11. A scroll compressor according to claim 7, wherein the oil supply passage formed in the crankshaft is eccentric with respect to the crankshaft center in the crank direction. 12. A fixed scroll and an orbiting scroll,
A crankshaft that is arranged in a horizontal direction to rotate the orbiting scroll, a main frame that supports the crank portion side of the crankshaft via a main bearing portion, and a lubricating oil that accommodates these devices and is maintained at a discharge pressure. In a scroll compressor having a horizontal structure including a closed container having a portion, a sub-bearing part that is attached to the closed container and supports an end of the crankshaft on the side opposite to the crank part, and the lubricating oil under the discharge pressure Section, a first oil supply passage communicating with a space at an end portion of the crank portion through an oil supply pipe attached to a closed container and an oil supply passage formed in the crankshaft, and the swirl scroll from the end portion space of the crank portion. A second oil supply passage that passes through the end plate to the low pressure portion and has a throttle portion that narrows the passage area in the middle thereof; and a second oil supply passage that opens from the middle of the first oil supply passage to the outer peripheral surface of the crankshaft A third oil supply passage for supplying lubricating oil to the main bearing portion by utilizing the centrifugal pump action by rotation, and a centrifugal pump for opening the outer peripheral surface of the crankshaft from the middle of the first oil supply passage and for rotating the crankshaft. And a fourth oil supply passage for supplying lubricating oil to the sub-bearing portion by utilizing the action of the scroll compressor.