JPH11107967A - Sealed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart a sufficient centrifugal force to a mixture of a lubricating oil with a coolant to satisfactorily separate the coolant from the lubricating oil by making an oil separating plate into a substantially disc form, and forming radial protruding parts and recessed parts on the surface of the disk continuously to the disc circumferential part. SOLUTION: An oil separating plate 37 has a substantially disc form having four radial protruding parts 39 and recessed parts 45 alternately formed on the lower surface adjacently to each other. The recessed parts 45 are linearly continued to the circumferential part of the disc. A through-hole 38 for piercing the rotating shaft 5 of a rotor core 11 is formed in the center of the disc, and bolt holes 42 are formed in the part of the protruding parts 39 around the through-hole 38 to fix the plate 37 through a bolt 43 and a nut 47. A mixture of a lubricating oil with a coolant is moved in contact with the protruding parts 39 through the recessed parts 45 as passage, and a centrifugal force is imparted thereto. Since the protruding parts 39 are continued to the disc circumferential part, the mixture is blown off from the ends of the protruding parts 39 by a sufficiently large centrifugal force, and collided with a stator 13. Since the distance between the end of the protruding parts 39 and an electric winding 15 is small, the coolant is sufficiently separated from the lubricating oil by a large impact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor, and more particularly to a shape of an oil separating plate provided to separate compressed refrigerant from lubricating oil inside a closed vessel of the compressor. .

[0002]

2. Description of the Related Art In a hermetic rotary compressor 1 as shown in FIG. 4, for example, a rotary shaft 5 is arranged concentrically inside a hermetic container 3, and an upper bearing 7 and a lower bearing 9 are provided below the hermetic container 3.
It is rotatably supported by. Above the rotating shaft 7,
The rotor core 11 is fixed. This rotor core 11
Of the stator core 13 on the outer peripheral side through a predetermined gap.
Is fixedly provided on the inner wall of the closed container 3. An electric motor winding 15 is fixedly provided adjacently above and below the stator core 13.

The lower bearing 7 and the upper bearing 9 have a disk shape having a hole through which the rotating shaft 7 passes. Two cylindrical cylinders 1 are sandwiched between the disk-shaped bearings 7 and 9.
7 and 19 are arranged concentrically via a partition plate 21.
The shape of the rotation shaft 5 inside the cylinders 17 and 19 is eccentric with respect to the axis of the rotation shaft 5, and a cylindrical roller 23 is arranged on the outer periphery. As a result, when the rotating shaft 5 rotates, each of the rotors 23 eccentrically rotates while rotating in contact with the inner walls of the cylinders 17 and 19.

A crescent-shaped space is formed between the rotor 23 and the cylinders 17, 19, and a vane (not shown) elastically projecting from the cylinders 17, 19 divides the crescent-shaped space into two. One is a suction chamber and the other is a compression chamber. The volume of the suction chamber increases as the eccentric rotation of the rotor proceeds. The space volume of the compression chamber decreases as the eccentric rotation proceeds. A suction port 25 is formed in each of the cylinders 17 and 19 and faces the suction chamber.
The refrigerant gas is supplied from an accumulator 29 outside the closed container 3 via the airtight container 3. Further, a discharge port 31 is formed in each of the cylinders 17 and 19 to face the compression chamber, further connected to a discharge pipe 33, bypassed to the inside of the sealed container 3, and further through a discharge pipe 35. Guided outside.

[0005] As described above, in the conventional hermetic compressor 1, the electric element (the rotor core 11, the stator core 13, the electric motor winding 15, etc.) and the compression element (the cylinder 1
7, 19, roller 23, vane, suction chamber, compression chamber, etc.)
Is stored.

[0006] The compression element works by the rotor (rotary shaft 5, rotor core 11, etc.) rotated by the electric element, and the refrigerant gas is compressed. The compressed refrigerant is guided to the inside of the closed container 3, and is in a state of being mixed with oil used for lubricating the compression element. In order to separate the mixture from the mixture, an oil separation plate 37 is provided above the rotor and rotates integrally. The mixture given the centrifugal force due to the rotation of the oil separating plate 37 is blown off and collides with the motor winding 15 of the stator. This stator (stator) constitutes a part of the electric element, and is arranged to face the outer periphery of the oil separating plate 37. Due to the impact on the stator, the oil separates from the refrigerant and falls to the lower part of the closed container 3. The refrigerant separated from the oil is discharged to the outside of the closed container 3 through the discharge pipe 35.

The conventional oil separating plate 37 has a substantially disk shape as shown in FIG. 5, and radially extending ridges 39 are formed on the lower surface of the disk around a hole 38 through which the rotating shaft 5 passes. Have been. A bolt hole 41 is formed in the portion of the ridge 39, and is fixed to the rotor core 11 of the rotor by a bolt 43 passing through the bolt hole.

[0008]

The mixture of the lubricating oil and the refrigerant is subjected to centrifugal force along the oil separating plate 37.
At this time, a large amount of the refrigerant flows in the radial direction along the ridge 39 and is blown from the tip of the ridge 39 in the radial direction. There is a large distance between the blown refrigerant and the stator (motor winding 15), a sufficient centrifugal force is not applied, a sufficient impact is not obtained when hitting the stator, and a sufficient oil separation is achieved. Was not done.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a sufficient centrifugal force to a mixture of lubricating oil and refrigerant to immediately apply a large impact to a stator, thereby causing the refrigerant and lubricating oil to be mixed. It is an object of the present invention to provide a hermetic compressor capable of sufficiently separating the oil of the present invention.

[0010]

Means for Solving the Problems To achieve the above object, a first aspect of the present invention is to provide an electric element housed in a closed container, a rotor rotated by the electric element, and a rotation of the rotor. A compression element that compresses the refrigerant gas and guides the refrigerant gas to the inside of the closed container, and an oil that is provided at an end of the rotor and that rotates integrally to apply centrifugal force to a mixture of the compressed refrigerant and the lubricating oil. A separator, and a stator that constitutes a part of the electric element and is disposed to face the outer periphery of the oil separator, and the stator that the mixture blown by the centrifugal force collides with, and collides with the stator A discharge pipe that guides the refrigerant separated from oil and discharges the refrigerant to the outside of the sealed container, wherein the oil separation plate has a substantially disk shape, and radially convex and concave stripes are formed on the surface of the disk. Is formed, and the convex and concave stripes are continuous to the outer periphery of the disk. It is a hermetic compressor that.

The second invention is a hermetic compressor, wherein the radial ridges are formed in a windmill shape curved in a radial direction of the disk.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in FIG.
Has a substantially disk-like shape, and radially extending ridges 39 and concave ridges 4 are formed on the lower surface.
4 are formed alternately next to each other. The concave streak 45
It is linearly continuous up to the outer periphery of the disk. In the center of the disk, a through hole 38 through which the rotating shaft 5 of the rotor penetrates is formed,
Around the through hole 38, a total of 4
A plurality of bolt holes 41 are formed. The oil separation plate 37 is fixed by the bolt 43 passing through the bolt hole 41 penetrating through the rotor core 11 and screwing into the nut 47 on the opposite side.

The operation and effect of this embodiment will be described below. The mixture of oil and refrigerant for lubrication is, for example, oil separation plate 37
Move along the lower surface of the. At this time, the mixture is
Move as a passage. Most of the mixture is
5 moves in contact with the ridge 39 adjacent to 5 and a centrifugal force is applied. Since the ridges 39 are continuous to the outer periphery of the disk, they move a long distance, and a sufficiently large centrifugal force is applied. Further, the mixture blown from the tip of the ridge 39 immediately collides with the stator. This is because the distance between the tip of the ridge 39 and the stator (particularly, the upper motor winding 15) is smaller because the ridge 39 is continuous to the outer peripheral portion of the oil separation plate 37 as compared with the related art.

The mixture blown off by the large centrifugal force in this way immediately collides with the stator and receives a large impact. Due to this impact, the refrigerant and the lubricating oil are sufficiently separated. The separated refrigerant gas is discharged to the outside through a discharge pipe 35 provided at the upper part of the closed vessel 3.

(Other Embodiments) In the above embodiments, the radial ridges 39 are provided linearly (FIG. 1), but in other embodiments, as shown in FIG. It is also possible to form the ridge 39 curved. That is, the ridges 39 are formed in a windmill shape curved in the radial direction of the disk of the oil separation plate 37. Since the blown mixture has a velocity component in the radial direction and a velocity component in the circumferential direction of the oil separation plate 37, the mixture moves without difficulty due to the curvature. Therefore, a sufficiently large speed can be obtained without difficulty,
More sufficient oil separation can be expected. In the above embodiment, the case where the number of the ridges 39 is four is illustrated, but the invention is not limited to this. A similar effect can be obtained with a plurality of lines such as two, three, five, and six.

[0016]

As described above, according to the first or second invention, the radial ridges and concaves formed on the surface of the disk-shaped oil separation plate are continuous to the outer peripheral portion of the disk. Because
The mixture of the refrigerant and the oil moves along the ridge to the outer periphery of the disk and is blown off from the tip of the ridge. Therefore, a sufficiently large centrifugal force is applied to the mixture, and the mixture is blown at a high speed and collides with the stator, so that a sufficiently large impact is applied. Further, by continuing the ridge to the outer peripheral portion of the disk, the distance between the tip of the ridge and the stator can be shortened, and the impact can be increased.

According to the second aspect of the present invention, since the radial ridges are curved and formed into a windmill shape, the mixture moving along the ridges has a centrifugal force acting in the radial direction and a force in the rotational direction. The originally curved movement is performed without difficulty,
Further, the impact force can be increased, and more sufficient oil separation can be expected.

[Brief description of the drawings]

FIG. 1A is a bottom view of an oil separation plate according to an embodiment of the present invention. FIG. 1B is a cross-sectional view taken along the line BB of FIG.

FIG. 2 is a longitudinal sectional view of a part of a hermetic compressor including the oil separation plate of FIG.

FIG. 3A is a rear view of an oil separation plate according to another embodiment. FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A.

FIG. 4 is a longitudinal sectional view showing a conventional hermetic compressor.

5A is a rear view showing an oil separation plate provided in the compressor shown in FIG. 4, and FIG. 5B is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 Closed container 5 Rotation axis 11 Rotor core 13 Stator core 15 Motor winding 17, 19 Cylinder 23 Rotor 35 Discharge pipe 37 Oil separation plate 38 Through hole 39 Convex 41 Bolt hole 45 Concave

Claims (2)

[Claims] An electric element housed inside a closed container, a rotor rotated by the electric element, a compression element that compresses refrigerant gas by rotation of the rotor and guides the refrigerant gas into the closed container, and a rotor. Is provided at the end and rotates integrally,
An oil separating plate for applying a centrifugal force to a mixture of the compressed refrigerant and the oil for lubrication, and an oil separating plate which constitutes a part of the electric element and is disposed to face the outer periphery of the oil separating plate, In a hermetic compressor having a stator against which the blown mixture collides, and a discharge pipe for guiding a refrigerant colliding with the stator and separated from oil, and discharging the refrigerant to the outside of the hermetic container, the oil separating plate includes: A hermetic compressor characterized by being substantially disk-shaped, having radially convex and concave ridges formed on the surface of the disk, wherein the ridges and concaves are continuous to the outer periphery of the disk. 2. The hermetic compressor according to claim 1, wherein the radial ridges are formed in a windmill shape curved in a radial direction of the disk.