JP3132347B2 - Scroll type fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine mainly used for a refrigerator or a compressor of an air conditioner.

[0002]

2. Description of the Related Art Conventionally, scroll-type fluid machines of this type have
For example, as described in JP-A-4-241785 and as shown in FIGS. 6 and 7, a bearing housing B is disposed inside a closed casing A, and a drive shaft C is mounted on the bearing housing B. Main bearing B1 to be supported and drive shaft C
A housing chamber B2 for accommodating the eccentric crank portion C1 and a thrust receiving portion B3 for supporting the rear side of the end plate D1 of the orbiting scroll D in the thrust direction are formed, and a bearing metal B4 is provided on the main bearing portion B1 of the bearing housing B. Drive shaft C via
And the cylindrical boss portion D2 of the movable scroll D is inserted and supported in the eccentric crank portion C1, and the boss portion D2 is eccentrically rotated in the housing chamber B2 with the driving of the crank portion C1. The end plate D1 of the movable scroll D is caused to revolve with respect to the fixed scroll while slidingly contacting the thrust receiving portion B3.

In the thrust receiving portion B3 of the bearing housing B, an annular oil groove B5 is formed which opens on the back side of the end plate D1 of the movable scroll D.
Is connected to an oil supply passage C2 in the drive shaft C through one communication passage B6 provided in the bearing housing B, and oil pumped to the oil supply passage C2 is supplied from the communication passage B6 to the annular oil groove B5. The thrust resistance of the movable scroll D is reduced by lubricating between the thrust receiving portion B3 and the end plate D1.

That is, the bearing housing B is formed with one communication passage B6 extending vertically from the annular oil groove B5 toward the main bearing portion B1, and a bearing provided in the main bearing portion B1. An outlet hole B7 communicating with the communication passage B6 is formed in the upper part of the metal B4, while an oil hole C7 opening in the oil supply passage C2 of the drive shaft C is formed on the lower inner surface.
A peripheral groove B8 communicating with the third groove 3 is formed, and a spiral groove B9 extending in an oblique direction for communicating the both is formed between the peripheral groove B8 and the outlet hole B7. Then, the oil pumped to the oil supply passage C2 is supplied to the oil hole C3, the peripheral groove B8, the spiral groove B8.
9, the oil is supplied to the annular oil groove B5 through the outlet hole B7 and one communication passage B6, and the oil is supplied from the annular oil groove B5 to between the thrust receiving portion B3 and the end plate D1. The communication passage B6 has a vertical hole a extending downward from the annular oil groove B5 toward the main bearing portion B1, and a vertical hole a extending from the outside of the main bearing portion B1 to an outlet hole B7 of the bearing metal B4. It comprises a lower side of the vertical hole a and a horizontal hole b formed in a communicating manner, and a filling plug c is attached to the outer side of the horizontal hole b.

[0005]

However, as described above, the oil supply passage C2 and the annular oil groove B5 are communicated by one communication passage B6, and the oil from the communication passage B6 is communicated with the annular oil groove B5.
In the case where the oil is supplied to only one of the positions 5, there is a problem in that the amount of oil supplied from the annular oil groove B5 to the space between the thrust receiving portion B3 and the end plate D1 becomes uneven, and the lubrication characteristics deteriorate. That is, when a visualization test was performed on the oil distribution state in the thrust receiving portion B3 when one communication passage B6 was provided, as shown in FIG. 7, the area near the opening of the communication passage B6 in the thrust receiving portion B3 was determined. In the case of E and F, the amount of refueling is relatively large, while in the regions G and H remote from the opening of the communication passage B6, the amount of refueling is such that some or no oil droplets exist. A large variation occurs in the amount of refueling in the thrust receiving portion B3.

In order to solve the above problem, a plurality of communication passages B6 are formed in the bearing housing B so as to open in the annular oil groove B5, and the bearing metal B4 is formed in a circumferential groove B8. A plurality of helical grooves B9 communicating with each other and an outlet hole B7 are formed, and each of the outlet holes B7 is communicated with each of the communication passages B6, so that the thrust receiving portion B3 is evenly lubricated through the plurality of communication passages B6. However, if a plurality of spiral grooves B9 and outlet holes B7 are formed in the bearing metal B4 as described above, the strength of the bearing metal B4 is reduced or the effective area of the bearing is reduced. Another adverse effect occurs that has an adverse effect on the system.

It is a main object of the present invention to improve the lubrication characteristics of the thrust receiving portion while maintaining the reliability of the main bearing portion while eliminating unevenness in the amount of oil supplied to the thrust receiving portion.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, as shown in FIGS. 1 and 2, a main bearing portion 51 communicating with an oil supply passage 42 of a drive shaft 4 is provided.
In a scroll type fluid machine including a bearing housing 5 provided with a thrust receiving portion 53 having an annular oil groove 54 facing the rear surface of the orbiting scroll 2, an annular oil passage 55 is provided at an oil outlet of a main bearing 51. The annular oil passage 55 and the annular oil groove 54 in the thrust receiving portion 53 are connected via a plurality of communication passages 56, 56.
The outlets 6 and 56 were displaced and opened along the circumference of the annular oil groove 54.

According to this configuration, the oil supply passage 4 of the drive shaft 4
The oil pumped to the main bearing portion 5 of the bearing housing 5
The annular oil groove 55 is supplied to an annular oil passage 55 provided at the first oil outlet portion, is distributed from the annular oil passage 55 to a plurality of communication passages 56, and is displaced from a plurality of mutually displaced outlet portions provided at the thrust receiving portion 53. Since the oil is supplied to the thrust receiving portion 54, the entire thrust receiving portion 53 can be uniformly supplied with oil, and the lubrication characteristics thereof can be improved. In particular, since the annular oil passage 55 is provided at the oil outlet of the main bearing 51, the outlet of the communication passage 56 is connected to the annular oil groove 5.
4, and can be evenly distributed to the thrust receiving portion 53 via the plurality of communication paths 56 immediately without being directly affected by the pressure accompanying the revolving drive of the movable scroll. I can refuel. In order to improve the lubrication characteristics of the thrust receiving portion 53, the main bearing 5
Since it is not necessary to form many grooves, holes, and the like in the bearing metal provided in 1, the reliability of the main bearing portion can be ensured without inviting a decrease in strength and a decrease in effective bearing area.

According to the second aspect of the present invention, in the first aspect of the present invention, the main bearing portion 51 is provided with the bearing metal 6, and the annular oil passage 55 is formed in the cylinder inner surface of the bearing housing 5 for receiving the bearing metal 6. Since the bearing metal 6 is installed in the main bearing portion 51 of the bearing housing 5, the outlet hole of the bearing metal 6 does not need to be aligned with the lateral hole of the communication path 56 formed in the bearing housing 5, At any position in the circumferential direction, the annular oil groove 54 is formed from the plurality of communication passages 56 through the annular oil passage 55 from the outlet hole of the bearing metal 6.
Can be refueled.

According to the third aspect of the present invention, in the first aspect of the present invention, the main bearing portion 51 is provided with the bearing metal 6, and the annular oil passage 55 is provided on the outer surface of the bearing metal 6 in a concave shape. The annular oil passage 5 can be easily formed simply by machining the bearing metal 6.
5 can be formed. In the invention according to claim 4,
In the invention of claim 1, since the outer diameter of the annular oil passage 55 is equal to or larger than the outer diameter of the annular oil groove 54, when the communication passage 56 is formed by a vertical hole and a horizontal hole,
Since the annular oil passage 55 can be used as the horizontal hole, the communication passage 56 can be easily formed only by performing a vertical hole communicating with the annular oil passage 55 without separately performing a horizontal hole processing, Further, it is not necessary to provide a filling plug or the like in the lateral hole.

[0012]

FIG. 5 shows a low-pressure dome-shaped scroll compressor used in a refrigerator as a scroll-type fluid machine. The motor M is disposed on the lower side. The compression element CF includes a movable scroll 2 in which a scroll 22 is protruded from a head plate 21, and a scroll 32 similarly to a head plate 31.
The scrolls 2 and 3 are combined such that the spiral bodies 22 and 32 face each other, and the end plate 21 of the movable scroll 2 has a boss portion at the center of the lower surface thereof. 23 are protruding.

A bearing housing 5 is provided at an intermediate portion of the casing 1 between the compression element CF and the motor M, and the bearing housing 5 mainly supports a drive shaft 4 extending from the motor M. A housing chamber 5 for housing a bearing portion 51 and an eccentric crank portion 41 provided on an upper side of the drive shaft 4.
2 and a thrust receiving portion 53 for supporting the rear side of the end plate 21 of the orbiting scroll 2 in the thrust direction. In the embodiment shown in the figure, the drive shaft 4 is supported by the main bearing portion 51 via the bearing metal 6 and the cylindrical boss portion 23 of the movable scroll 2 is inserted into the crank portion 41 via the bearing metal 24. The boss 23 is eccentrically rotated in the storage chamber 52 in accordance with the driving of the crank part 41 by the fitting support, so that the end plate 21 of the movable scroll 2 is brought into sliding contact with the thrust receiving part 53 and is fixed to the fixed scroll 3. On the other hand, it is driven to revolve.

An annular oil groove 54 is formed in the thrust receiving portion 53 of the bearing housing 5 on the back side of the end plate 21 of the orbiting scroll 2, and the annular oil groove 54 is formed on the bearing metal 6. Communication path 5 to be described later from the oil path to be provided
6, through the oil supply passage 42 in the drive shaft 4
The oil pumped into the oil supply passage 42 is supplied to the annular oil groove 54.
To the thrust receiving portion 53 and the movable scroll 2
Is lubricated with the end plate 21.

More specifically, as an oil path of the bearing metal 6, an outlet hole 61 communicating with an annular oil path 55 described later is formed on an upper side thereof, and a lower part of an inner surface of the bearing metal 6 is formed on a lower side thereof. A peripheral groove 62 communicating with the oil hole 43 opened in the oil supply passage 42 of the drive shaft 4 is provided, and a spiral groove 63 extending in an oblique direction is formed between the peripheral groove 62 and the outlet hole 61 to communicate the two. Then, the oil hole 43
The oil that has reached the circumferential groove 62 via the spiral groove 63 and the outlet hole 61 is supplied to the annular oil passage 55.

A lower bearing 10 is provided on the lower side of the casing 1 to support the lower side of the drive shaft 4 on the bearing 10, and the lower end of the drive shaft 4 is provided with a rotary drive. A pump 44 is provided for pumping the oil in the bottom oil reservoir 1a of the casing 1 into the oil supply passage 42 by the centrifugal force accompanying the above. The drive shaft 4 is partially cut out of the outer peripheral wall of the crank portion 41, so that the drive shaft 4 is provided between the crank portion 41 and the bearing metal 24 fitted to the crank portion 41.
An oil passage 45 that opens to the housing chamber 52 is formed, and oil flows out from the upper end side of the oil supply passage 42 to the housing chamber 52 through the oil passage 45, and the oil in the housing chamber 52 is transferred to the bearing housing 5. Is returned to the inside of the casing 1 from an oil drain passage (not shown).

Further, a partition 7 is disposed inside the casing 1 above the fixed scroll 3, and a discharge port 33 provided in the fixed scroll 3 is opened above the partition 7. And a high-pressure chamber 12 in which an external discharge pipe 11 for discharging the discharged refrigerant to the outside of the casing 1 is formed, and a suction pipe 13 is formed below the partition 7.
Form a low-pressure chamber 14 that opens. In the figure, 71
Is a filter provided on the upper side of the partition 6.

The boss 23 is eccentrically rotated via the crank 41 with the rotation of the drive shaft 4, and the movable scroll 2 is revolved with respect to the fixed scroll 3. The low-pressure gas sucked from the scroll 13 is fed to the scrolls 22,
The suction gas is compressed and discharged from the discharge port 33 to the high-pressure chamber 12.
1 to the outside of the casing 1.

Thus, in the above configuration, in order to uniformly lubricate the entire thrust receiving portion 53 provided in the bearing housing 5 and improve the lubrication characteristics, as shown in FIGS. An annular oil passage 55 that is always open to the outlet hole 61 is formed in a concave shape on the inner surface of the upper cylinder 51 at a position facing the outlet hole 61 of the bearing metal 6, and the annular oil passage 55 and the thrust receiving portion are formed. The annular oil groove 54 is connected to the annular oil groove 54 by two communication passages 56, 56, and the outlet sides of the communication passages 56 are displaced by 180 degrees from each other so that the annular oil grooves 54 are opened at opposing positions. Let it. The number of the communication passages 56 is not limited to two, and two or more communication passages may be provided, and the angles at which the outlets of the communication passages 56 are mutually displaced may be any angle.

Each of the communication passages 56 has a vertical hole 56a extending downward from the annular oil groove 54 through the outer wall of the storage chamber 52 toward the main bearing 51,
From the outside toward the annular oil passage 55 to the vertical hole 56a.
And a horizontal hole 56b formed in communication with the lower side of
A filling plug 56c is attached to the outside of the horizontal hole 56b.

Further, the horizontal hole 56b of each of the communication passages 56 is omitted, and the vertical hole 56b is formed without necessitating a separate horizontal hole processing.
In order to simply form the communication passages 56 only by providing the a, and to eliminate the necessity of attaching the filling plug 56c to the horizontal hole 56b, the annular oil passage 55 is formed as shown in FIG. The outer diameter of the annular oil groove 54 is made equal to or larger than the outer diameter of the annular oil groove 54 by using a T-slotter or the like at the time of cutting.
It is preferable to open the lower end side of the.

In this embodiment, the annular oil passage 55
Is formed on the inner surface of the upper cylinder of the main bearing portion 51 facing the outlet hole 61 of the bearing metal 6, but is not formed on the main bearing portion 51, and the communication passage 56 is formed on the outer surface of the bearing metal 6. May be provided in a concave shape at a portion opposed to.

[0023]

As described above, according to the first aspect of the present invention, the oil pumped to the oil supply passage 42 of the drive shaft 4 is
The oil is supplied to an annular oil passage 55 provided at the oil outlet of the main bearing portion 51 of the bearing housing 5, distributed from the annular oil passage 55 to a plurality of communication passages 56, and formed into a plurality of displaced mutually formed thrust receiving portions 53. Can be supplied to the annular oil groove 54 from the outlet portion of the thrust receiving portion 53, so that the entire thrust receiving portion 53 can be supplied uniformly and the lubrication characteristics thereof can be improved. In order to enhance the lubrication characteristics of the thrust receiving portion 53, the main bearing 51
Since it is not necessary to form many grooves, holes, and the like in the bearing metal 6 provided in the main bearing portion 51, the reliability of the main bearing portion 51 can be ensured without reducing the strength of the main bearing portion 51 or reducing the effective bearing area.

According to the second aspect of the present invention, when the bearing metal 6 is incorporated into the main bearing portion 51 of the bearing housing 5, the exit hole of the bearing metal 6 is formed in the lateral hole of the communication passage 56 formed in the bearing housing 5. Therefore, oil can be satisfactorily supplied to the annular oil groove 54 from the outlet holes of the bearing metal 6 through the annular oil passage 55 through the plurality of communication passages 56 at any position in the circumferential direction.

According to the third aspect of the present invention, the annular oil passage 5
5 can be easily formed.

According to the fourth aspect of the present invention, the annular oil passage 5
5 is made equal to or larger than the outer diameter of the annular oil groove 54, so that the annular oil passage 55 can be easily formed using a T-slotter or the like while the communication passage 56 is formed. When forming with a vertical hole and a horizontal hole, since the annular oil passage 55 can be used as the horizontal hole, it is only necessary to perform vertical hole processing communicating with the annular oil passage 55 without separately performing horizontal hole processing. The communication path 56 can be easily formed, and there is no need to provide a plug in the lateral hole.

[Brief description of the drawings]

FIG. 1 is a plan view showing a bearing housing part which is a main part of the present invention.

FIG. 2 is a cross-sectional view as seen from the direction of the line XX in FIG. 1;

FIG. 3 is a cross-sectional view as seen from the direction of line YY in FIG. 2;

FIG. 4 is a cross-sectional view showing another embodiment.

FIG. 5 is a partially omitted longitudinal sectional view showing the entire structure of the scroll type fluid machine.

FIG. 6 is a sectional view showing a conventional bearing housing part.

FIG. 7 is a plan view of the bearing housing.

[Explanation of symbols]

 2 movable scroll 4 drive shaft 42 oil supply passage 5 bearing housing 51 main bearing part 52 crank housing chamber 53 thrust receiving part 54 annular oil groove 55 annular oil path 56 communication path 6 …… Bearing metal

Claims (4)

(57) [Claims] 1. A thrust receiving portion (53) having a main bearing portion (51) communicating with an oil supply passage (42) of a drive shaft (4) and an annular oil groove (54) facing the back surface of a movable scroll (2). In the scroll type fluid machine provided with the bearing housing (5) provided with the annular oil passage (55) at the oil outlet of the main bearing portion (51), the annular oil passage (55) and the thrust receiving portion ( A plurality of communication passages (56) are provided between the annular oil groove (54) and the annular oil groove (54).
(56), and the outlets of the communication passages (56) and (56) are displaced from each other along the circumference of the annular oil groove (54) to open. And scroll type fluid machinery. 2. A bearing metal (6) is provided in a main bearing portion (51), and an annular oil passage (55) is provided in a concave shape on an inner surface of a cylinder of a bearing housing (5) for receiving the bearing metal (6). The scroll type fluid machine according to claim 1, wherein 3. The scroll type according to claim 1, wherein the main bearing portion (51) is provided with a bearing metal (6), and an annular oil passage (55) is provided in a concave shape on an outer surface of the bearing metal (6). Fluid machinery. 4. The scroll type fluid machine according to claim 1, wherein an outer diameter of the annular oil passage (55) is equal to or larger than an outer diameter of the annular oil groove (54).