JPH0723521Y2 - Scroll type fluid machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a scroll type fluid machine used as a compressor, an expander or the like.

(Prior Art) An example of a conventional scroll compressor is shown in FIG.

As shown in FIG. 3, a scroll-type compression mechanism C is provided in the upper portion of the hermetically sealed housing 8, and an electric motor 4 is provided in the lower portion thereof.

The scroll type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, a rotation preventing mechanism 3 which allows the orbiting orbiting motion of the orbiting scroll 2 but prevents its rotation, a drive bush 54 and an eccentricity which constitute the orbiting drive mechanism of the orbiting scroll 2. A pin 53, an upper bearing 71 and a lower bearing 72 that support the rotating shaft 5, an orbiting bearing 73 and a thrust bearing 74 that support the orbiting scroll 2, a bearing case 6 that supports these bearings 71, 72, 73 and the thrust bearing 74, etc. Is equipped with. The bearing case 6 is fixed to the housing 8, and the fixed scroll 1 and the stator of the electric motor 4 are fixed to the bearing case 6.

The fixed scroll 1 is composed of an end plate 11 and a spiral scroll 12,
A discharge port 13 and a discharge valve 17 for opening and closing the discharge port 13 are provided at 11.

The orbiting scroll 2 is composed of an end plate 21, a spiral member 22, and a boss 23, and a drive bush 54 fitted in the boss 23 is rotatably supported by an orbiting bearing 73. And
An eccentric pin 53 protruding from the upper end of the rotary shaft 5 is rotatably supported by the drive bush 54, and a balance weight 84 is fixed to the drive bush 54.

The lubricating oil 81 stored in the bottom of the housing 8 is sucked up from the inlet hole 51 by the centrifugal force generated by the rotation of the rotary shaft 5, passes through the oil supply hole 52, and the lower bearing 72, the eccentric pin 53, the upper bearing 71, and the rotation prevention mechanism 3 After lubricating the orbiting bearing 73, the thrust bearing 74, etc., the oil is discharged to the bottom of the housing 8 through the chamber 61 and the oil drain hole 62.

When the electric motor 4 is driven, this rotation is transmitted to the orbiting scroll 2 via the orbiting drive mechanism including the rotating shaft 5, the eccentric pin 53, the drive bush 54, etc., and the orbiting scroll 2 is prevented from rotating by the rotation inhibiting mechanism 3. While being revolved, it makes a revolution movement.

Then, the gas enters the housing 8 through the suction pipe 82,
After cooling the electric motor 4, the electric motor 4 is sucked from the suction passage 15 through the suction chamber 16 into the plurality of closed spaces 24 which are limited by the engagement of the fixed scroll 1 and the orbiting scroll 2. Then, as the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the space is compressed and reaches the central portion, and the discharge valve 17 is pushed up through the discharge port 13 to be discharged to the discharge cavity 14, and further, It enters into the second discharge cavity 19 through the hole 18 formed in the partition wall 31, and is discharged from there through the discharge pipe 83 to the outside.

(Problems to be Solved by the Invention) In the conventional scroll type compressor described above, a seat for supporting the thrust bearing 74, that is, the bearing case 6 is provided.
There is a problem that the temperature of the upper surface of the bearing case 6 becomes high and the weight of the bearing case 6 is heavy.

(Means for Solving the Problems) The present invention has been proposed to solve the above problems, and its gist is to fix a fixed scroll that meshes with an orbiting scroll in a housing and The scroll is supported by a bearing case fixed to the housing via a thrust bearing, and the rotation prevention mechanism prevents the rotation of the scroll. There is provided a scroll type fluid machine having a revolving orbiting motion, characterized in that the bearing case has at least one or more cast-out holes provided behind a seat for supporting the thrust bearing.

(Operation) Since the present invention has the above-mentioned configuration, the bearing case is lightened without impairing its original function.

(Embodiment) One embodiment of the present invention is shown in FIGS. 1 and 2.

As shown in FIG. 1 and FIG. 2, one or more casting holes 64 that connect the outer circumference of the bearing case 6 and the chamber 61 are provided behind the seat 63 on which the bearing case 6 supports the thrust bearing 74. It is provided.

Other configurations are similar to those of the conventional one shown in FIG. 3, and corresponding members are designated by the same reference numerals.

Since the bearing case 6 is provided with the casting hole 64, the weight of the bearing case 6 is lighter than that of the conventional one, and therefore the material for casting is reduced, so that the cost of the bearing case 6 is reduced. Can be reduced. Further, since the casting hole 64 is provided behind the receiving seat 63, the original function of the bearing case 6 is not impaired at all.

Then, since the suction gas enters the chamber 61 through the casting hole 64, the seat 63 of the thrust bearing 74 can be cooled and the rotation preventing mechanism 3 can be cooled by the lubricating oil contained in the suction gas.
The swing drive mechanism including the drive bush 54 and the eccentric pin 53 can be lubricated and cooled.

(Effect of the Invention) In the present invention, since the bearing case has at least one or more cast-out holes behind the seat for supporting the thrust bearing, the weight of the bearing case is reduced without impairing the original function of the bearing case. It is possible and the cost can be reduced. Further, since the thrust bearing, the rotation preventing mechanism and the swivel drive mechanism can be cooled and lubricated by gas, the reliability thereof can be improved.

[Brief description of drawings]

1 and 2 show one embodiment of the present invention. FIG. 1 is a partial vertical sectional view and FIG. 2 is a perspective view of a bearing case. FIG. 3 is a vertical sectional view of a conventional scroll type compressor. Fixed scroll …… 1, orbiting scroll …… 2, housing …… 8, bearing case …… 6, thrust bearing …… 74, rotation prevention mechanism …… 3, rotary shaft ……
5, bearing …… 71, 72, swivel drive mechanism …… 53, 54, casting hole …… 64

Claims (1)

[Scope of utility model registration request] 1. A fixed scroll that meshes with an orbiting scroll is fixed in a housing, the orbiting scroll is supported by a bearing case fixed to the housing via a thrust bearing, and its rotation is prevented by a rotation preventing mechanism. In a scroll type fluid machine in which a rotary shaft pivotally supported by a bearing in the bearing case causes a revolving orbital motion through a revolving drive mechanism, at least one bearing case is provided behind the seat where the bearing case supports the thrust bearing. A scroll type fluid machine characterized in that a cast hole is formed.