JPH11107959A - Discharge pipe of sealed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate the lubricating oil contained in a compressed gas and to attenuate the discharge pulsation by blocking the end part on a sealed vessel inner part side of the discharge pipe of the sealed compressor for discharging the compressed gas to the outside, and providing a plurality of small holes in this end part. SOLUTION: A compressed gas 43 including a lubricating oil is passed through a plurality of small holes 41 of a discharge pipe 35. The lubricating oil included in the compressed gas is hardly passed through the small holes 41, and apt to be adhered to the circumference of the small holes 41 since the specific gravity of the lubricating oil is large, compared with the compressed gas. The adhered lubricating oil then forms into a drop 45 and fall down into a sealed vessel 3. Thus, the compressed gas is separated from the lubricating oil. Further, the flow of the compressed gas 43 is changed by throttling the passage sectional area when the compressed gas 43 is passed through the small holes 41, and the turbulent flow state including a pulsating pressure component so far is changed to a laminar flow state. At this time, the pulsating pressure component is attenuated. Thus, the vibration or noise in a piping through which the compressed gas 43 is passed is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor provided in a refrigerant circuit provided in, for example, an air conditioner, a refrigeration facility, or a refrigeration facility. The present invention relates to a structure of a discharge pipe discharged from a closed container.

[0002]

2. Description of the Related Art For example, in a hermetic rotary compressor 1 for compressing refrigerant gas as shown in FIG. 2, a rotary shaft 5 is arranged concentrically inside a hermetic container 3, and an upper bearing is provided below the hermetic container 3. 7 and the lower bearing 9 rotatably supported.
Above the rotation shaft 5, a rotor 11 is fixed. A stator 13 is fixed to the inner wall of the closed casing 3 on the outer peripheral side of the rotor 11 via a predetermined gap.
An electric motor winding 15 is fixedly provided adjacently above and below the stator 13.

The lower bearing 9 and the upper bearing 7 have a disk shape having a hole through which the rotating shaft 5 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 rotation shaft 5 rotates, each roller 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 roller 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. In the compression chamber, the space volume decreases as the eccentric rotation proceeds, and the compression process is performed.

A suction port 25 is formed in each of the cylinders 17 and 19 so as to face the suction chamber.
The refrigerant gas is sucked in from the accumulator 29 outside the closed container 3 through. 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. It is discharged outside.

As described above, in the conventional hermetic compressor 1, the electric elements (the rotor 11, the stator 13, etc.) and the compression elements (the cylinders 17, 19, the rollers 23, the vanes, etc.) are housed inside the closed casing 3. .

[0007] The compression element works by the rotating shaft 5 rotated by the electric element, and the refrigerant gas is compressed. The compressed refrigerant gas is guided to the inside of the closed container 3, and is mixed with the oil used for lubricating the compression element.

[0008]

However, according to the above prior art, the compressed refrigerant gas is mixed with the oil used for lubrication inside the closed vessel 3, and is directly passed through the discharge pipe. When the oil is discharged to the outside, the oil used for lubrication is also discharged as it is, causing various inconveniences.

For example, when the gas to be compressed is a refrigerant gas, oil other than the refrigerant circulates in the refrigerant circuit and becomes an impurity. In addition, the amount of lubricating oil for the compression element in the closed container is reduced, which may hinder lubrication. Further, although the conventional hermetic compressor generates discharge pulsation in the discharged compressed gas, the conventional discharge pipe is open at both ends, so that a pulsation damping effect cannot be expected.

[0010] The above problems are not limited to the rotary compressor, and the gas to be compressed is not limited to the refrigerant gas but exists similarly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a discharge pipe of a hermetic compressor capable of separating lubricating oil contained in compressed gas and attenuating discharge pulsation. Aim.

[0012]

According to the present invention, a compression element driven by an electric element housed in a closed container compresses gas sucked from outside the closed container. After introducing the compressed gas into the closed container, the discharge tube of the hermetic compressor which discharges the gas to the outside through the discharge tube closes the end of the discharge tube inside the sealed container, A plurality of small holes are provided in the portion.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of the present invention will be described.
This will be described with reference to FIG. FIG. 1 corresponds to the upper part of FIG. 2 showing the prior art. The same parts as those in FIG. 2 are denoted by the same reference numerals.

A discharge pipe 35 is provided through the upper portion of the closed vessel 3. An end 37 of the discharge pipe 35 on the inner side of the closed container is closed with a plate 39. This end 37
Are provided with a plurality of small holes 41. It is desirable that the total sectional area of the small holes 41 exceeds the sectional area of the discharge pipe 35. It is desirable that the number of the small holes 41 is as large as possible.

When the rotating shaft is rotated by the electric element and the compression element operates, the refrigerant gas sucked from the outside of the closed vessel 3 is compressed, becomes the compressed gas 43, and is guided into the closed vessel 3 through the pipe 33. The introduced compressed gas 43 rises through, for example, a gap between the rotor 11 and the stator 13 and reaches the upper portion of the closed casing 3. At this time, since the compressed gas 43 passes through the small gap of the compression element, it is mixed with the lubricating oil.

Thus, the compressed gas 4 containing the lubricating oil
3 passes through a plurality of small holes 41 of the discharge pipe 35. At this time, the lubricating oil contained in the compressed gas hardly passes through the small holes 41 and adheres around the small holes 41, that is, on the outer wall of the discharge pipe 35. In other words, since the lubricating oil has a large specific gravity with respect to the compressed gas, it tends to adhere.

The attached lubricating oil eventually becomes droplets 45 and drops down inside the closed container 3. Therefore, the compressed gas and the lubricating oil are separated. As a result, the discharge of the lubricating oil to the outside of the closed container 3 is suppressed. This prevents the amount of lubricating oil that lubricates the mechanical sliding part of the compression element from being reduced.

When the compressed gas 43 passes through the small hole 41, the pulsating pressure component of the compressed gas 43 is attenuated. That is, when the compressed gas 43 passes through the small holes 41, the flow path cross-sectional area is reduced, so that the flow of the compressed gas 43 changes, and the turbulent state including the pulsating pressure component up to that time changes from the turbulent state to the laminar state. Become. At this time, the pulsating pressure component is attenuated. This attenuation is caused by the so-called punching metal effect. Thus, the discharge pulsation of the discharged compressed gas 43 is reduced, and thereafter, the vibration and noise of the pipe through which the compressed gas 43 passes are suppressed.

(Other Embodiments) In the above embodiment, the hermetic compressor is the hermetic rotary compressor 1.
In other embodiments, not only a rotary compressor but also a reciprocating compressor or a scroll compressor, in which an electric element or a compression element is housed in the hermetically sealed container 3, and the compressed gas 43 is compressed. The present invention can be implemented as long as the hermetic compressor is discharged to the outside through the discharge pipe 35.

In the above embodiments, the compressed gas is a refrigerant gas. However, in other embodiments, it is not always necessary to compress the refrigerant gas. For example, the compressed gas may compress air. Absent.

Further, in the above embodiment, the plurality of small holes 41 are formed by directly drilling the peripheral wall at the end of the discharge pipe 35, but in other embodiments, A number of small holes may be provided by attaching a mesh (wire mesh) or the like to the end of the discharge pipe 35.

[0022]

As described above, according to the present invention, when the compressed gas passes through the small hole provided in the discharge pipe, the lubricating oil contained in the compressed gas adheres to the outer wall of the discharge pipe. Since the lubricating oil is separated, the lubricating oil can be prevented from being discharged to the outside.

Also, when the compressed gas passes through the small hole of the discharge pipe, the discharge pulsation of the compressed gas is attenuated. The discharge pulsation is attenuated by the so-called punching metal effect,
Vibration and noise of the pipe through which the discharged compressed gas passes are reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view showing a main part of a hermetic compressor according to an embodiment of the present invention.

FIG. 2 is an overall vertical sectional view showing a conventional hermetic compressor.

[Explanation of symbols]

 Reference Signs List 3 Closed container 5 Rotating shaft 7 Upper bearing 9 Lower bearing 11 Rotor 13 Stator 15 Interlocking machine winding 17, 19 Cylinder 21 Partition plate 23 Roller 25 Suction port 27 Suction pipe 29 Accumulator 31 Discharge port 33 Discharge pipe 35 Discharge pipe 41 Small hole

Claims (1)

[Claims] 1. A compression element driven by an electric element housed in a closed container compresses a gas sucked from the outside of the closed container and guides the compressed gas to the inside of the closed container. A discharge pipe of the hermetic compressor which discharges the air through the hermetic compressor, wherein an end of the discharge pipe on the inner side of the hermetic container is closed, and a plurality of small holes are provided at this end. Discharge pipe.