JP2994860B2 - Horizontal hermetic compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal hermetic compressor.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional scroll type compressor installed horizontally. Sealed housing 8
Of the high pressure side 44 by the discharge cover 31
And a low-pressure side 45.

[0003] Inside the low-pressure side 45, a scroll-type compression mechanism C is provided at the front thereof and an electric motor M is provided at the rear thereof.

The electric motor M includes a rotor Ma and a stator Mb.
And the rotor Ma is fixed to the rotating shaft 5,
The stator Mb is fixed by being pressed into the closed housing 8. The scroll type compression mechanism C permits the revolving orbiting motion of the fixed scroll 1, the orbiting scroll 2, and the orbiting scroll 2, but the rotation preventing mechanism 3, such as an Oldham link, for preventing the rotation, the fixed scroll 1, and the electric motor M are fastened. And a front bearing 71 and a rear bearing 72 that support the rotating shaft 5.

The fixed scroll 1 has an end plate 11 and a spiral wrap 12 erected on its inner surface.
A discharge port 13 is provided at the center of the. The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface thereof. A drive bush 54 is rotatable via a slewing bearing 73 in a boss 23 erected on the outer surface of the end plate 21. An eccentric pin 53 protruding from an end of the rotary shaft 5 is rotatably fitted into a hole 55 formed in the drive bush 54.

A plurality of closed spaces 24 are formed by eccentrically fixing the fixed scroll 1 and the orbiting scroll 2 with each other by a predetermined distance and shifting them by 180 degrees. An oil pump 51 is provided at an end of the rotary shaft 5, and a suction port 56 of the oil pump 51 faces below the closed housing 8, and a discharge port (not shown) has an oil supply hole 52 formed in the rotary shaft 5. Is in communication with

When the electric motor M is driven, the orbiting scroll 2 is driven via a revolving orbiting mechanism including a rotary shaft 5, an eccentric pin 53, a drive bush 54, a boss 23 and the like. Revolves in a circular orbit of a revolving radius while preventing rotation.

When the orbiting scroll 2 is turned, gas enters the low-pressure side 45 through the suction pipe 82, and this gas is passed through the passage 6
After passing through 1 and passing through the low pressure chamber 43, it is sucked into the closed space 24. Then, as the volume of the closed space 24 decreases due to the revolving orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, pushes the check valve 17 from the discharge port 13 and opens the high pressure chamber 42 to the high pressure side 44. And discharged from the outside through a discharge pipe 83.

At the same time, the lubricating oil stored in the lower portion of the inside of the sealed housing 8 is sucked up from the suction port 56 by the oil pump 51, passes through the oil supply hole 52, the rear bearing 72, the front bearing 71, the eccentric pin 53, the turning After being supplied to the sliding parts such as the bearing 73 and lubricating them, they are discharged from the oil drain passage 62 and stored in the lower part of the sealed housing 8.

[0010]

In the above-mentioned conventional horizontal hermetic compressor, the stator Mb press-fitted into the inner peripheral surface of the hermetic housing 8 is formed with a partially notched passage 85 so that the oil is drained. The lubricating oil discharged from the passage 62 returns to the rear side of the stator Mb through the passage 85. However, when the passage 85 is formed large, the efficiency of the electric motor M is reduced, so that the electric motor M can be minimized.

As a result, the lubricating oil discharged from the oil discharge passage 62 into the closed housing 8 becomes difficult to return to the suction port 56 of the oil pump 51, and the oil level is lowered on the rear side of the stator Mb so that the oil pump 51 In addition to causing poor lubrication of the sliding portion due to the reduced suction amount, the oil level rises on the front side of the stator Mb, and the lubricating oil flows from the closed housing 8 to the closed space 2.
In addition, there is a problem that the amount of oil rising (meaning the amount of lubricating oil contained in the discharged gas) increases because the gas is easily entrained by the gas sucked into the gas. The present invention relates to a horizontal hermetic compressor,
It is an object of the present invention to prevent the above-described poor lubrication from occurring and to prevent oil rising.

[0012]

Since the present invention SUMMARY OF] is to solve the above problems, a compression mechanism, before an oil pump driven by the electric motor and the electric motor for driving the same compression mechanism
Later, in this order, the suction pump provided in the housing behind the oil pump and housed in the closed housing by the oil pump.
The lubricating oil sucked in from the inlet and supplied to the sliding portion of the compression mechanism is provided in front of the electric motor and behind the compression mechanism.
In a horizontal hermetic compressor configured to be discharged from an oil drain passage into a housing, the suction port is provided before and after the electric motor through the hermetically sealed housing .
A configuration is employed in which a lubricating oil extraction pipe is provided which communicates a lower portion of the sealed housing between a portion and a portion provided with the oil discharge passage .

[0013]

According to the present invention, the following effects are obtained as a result of taking the above measures. Installed in the housing behind the oil pump
The lubricating oil sucked from the drawn suction port and lubricating the sliding portion such as the compression mechanism is discharged from the oil discharge passage between the compression mechanism and the electric motor in the sealed housing, and then the suction port is provided.
Between the portion and the portion provided with the oil drain passage.
The oil is smoothly returned to the rear side of the electric motor through the lubricating oil extraction pipe communicating with the lower part of the housing, and is sucked into the oil pump. This prevents poor lubrication and oil spillage found in conventional products.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on an embodiment shown in FIG. In FIG. 1, members corresponding to those of the related art shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. The hermetically sealed housing 8 of the compressor installed horizontally is provided with an extraction pipe 91 passing through the outside. One end of the extraction pipe 91 is connected to the front side of the stator Mb where the oil drain passage 62 is located, and the other end is connected to the rear side of the stator Mb where the oil pump 51 is installed.

The lubricating oil sucked up from the suction port 56 by the oil pump 51 passes through the oil supply hole 52 and the rear bearing 72,
The lubricating oil is supplied to sliding parts such as the front bearing 71, the eccentric pin 53, the turning bearing 73, and the like. After lubricating these, the oil is discharged from the oil drain passage 62 into the closed housing 8 and passes through the extraction pipe 91 to form the stator Mb. Return to the back side.

As described above, the lubricating oil smoothly returns to the rear side of the stator Mb on which the oil pump 51 is installed via the extraction pipe 91, so that the oil level can always be maintained at a sufficient level and slide. It is possible to prevent running out of refueling, and to avoid a situation where the oil level on the front side of the stator Mb rises.

Further, since the lubricating oil is cooled by the outside air while passing through the extraction pipe 91, its viscosity can be maintained at a high level, and the sliding portion can be lubricated well. Although the embodiments of the present invention have been described above, it is needless to say that the specific shape and structure may be variously changed within the scope of the present invention.

[0018]

According to the present invention, there is provided a lubricating oil discharge pipe for passing the outside through the hermetically sealed housing and connecting the front side and the rear side of the electric motor.
The lubricating oil discharged from the oil drain passage into the housing is supplied to the oil pump installed on the rear side of the electric motor through this extraction pipe .
Since the suction port can be smoothly returned into the housing, the lubrication failure of the sliding portion can be prevented, and the rise of the oil level on the front side of the electric motor can be suppressed, so that the oil rising amount can be reduced. In addition, this
Since the lubricating oil can be cooled by the outside air in the process of passing through the extraction pipe provided in the portion , the viscosity can be kept high and the sliding portion can be lubricated well.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a compressor according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional compressor.

[Explanation of symbols]

 Reference Signs List 8 Hermetic housing C Compression mechanism M Electric motor Ma Rotor Mb Stator 51 Oil pump 56 Suction port 62 Oil drain passage 53 Eccentric pin 71 Front bearing 72 Rear bearing 73 Slewing bearing 91 Extraction pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F04C 23/00-29/10 331 F04C 18/02 311

Claims (1)

(57) [Claims] 1. A compression mechanism, before an oil pump driven by the electric motor and the electric motor for driving the same compression mechanism
And later provided in the housing behind the oil pump by the oil pump incorporated in the sealed housing in this order.
The lubricating oil sucked from the suction port and supplied to the sliding portion of the compression mechanism is provided in front of the electric motor and behind the compression mechanism.
In the horizontal hermetic compressor configured to be discharged from the oil drain passage into the housing, the suction port is provided before and after the electric motor through the hermetically sealed housing .
A horizontal hermetic compressor characterized in that a lubricating oil discharge pipe communicating with a lower portion of the hermetically sealed housing is provided between a portion provided with the oil drain passage and a portion provided with the oil drain passage .