JP3035078B2 - Horizontal sealed electric 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 electric compressor.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional horizontal hermetic electric compressor.
An example is shown. The interior of the closed housing 8 of Yoko置 scroll type compression mechanism C and an electric motor M is built, electrostatic
One of the rotating shafts 5 extending substantially horizontally of the dynamic motor M;
The scroll type compression mechanism C is interlocked and connected to the end. The electric motor M includes a rotor Ma and a stator Mb.
Ma is fixed to the rotating shaft 5, and the stator Mb is fixed to the closed housing 8.

The scroll type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2 and a rotation preventing mechanism 3, such as an Oldham link, for preventing the orbiting of the orbiting scroll 2 from rotating. The front end of the rotating shaft 5 is supported by the frame 6 via a front bearing 71, and the rear end is supported by the stay 33 via a rear bearing 72.

The fixed scroll 1 has an end plate 11 and a spiral wrap 12 erected on the inner surface thereof, and a discharge port 13 is provided at the center of the end plate 11.

The orbiting scroll 2 has an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21. A drive bush 54 is provided with a slewing bearing 73 in a boss 23 erected on the outer surface of the end plate 21. And is rotatably inserted through the connector. An eccentric pin 53 projecting from the front end of the rotary shaft 5 is rotatably fitted to the drive bush 54.

[0006] The fixed scroll 1 and the orbiting scroll 2 are eccentric with each other by a predetermined distance, and are engaged with each other at an angle of 180 ° to engage with each other.
Are formed.

The other end of the rotating shaft 5, that is, the scroll
An oil pump 51 driven by the oil pump 51 is installed at the opposite end of the mold compression mechanism C. The tip of a suction pipe 56 of the oil pump 51 is immersed in lubricating oil 57 stored in the bottom of the closed housing 8. The discharge port of the oil pump 51 communicates with an oil supply hole 52 formed in the rotary shaft 5.

By driving the electric motor M, the rotating shaft 5, the eccentric pin 53, the drive bush 54, the boss 23
The orbiting scroll 2 is driven via a revolving orbiting mechanism composed of the above or the like, and the orbiting scroll 2 orbits on a circular orbit having a revolving orbital radius while being prevented from rotating by a rotation preventing mechanism 3.

Then, the gas enters the closed housing 8 through the suction pipe 82, passes through the passage 85 and the suction passage 15, and enters the suction chamber 43.
Is sucked into the closed space 24 via Then, as the volume of the sealed space 24 decreases due to the revolving orbiting motion of the orbiting scroll 2, it reaches the center while being compressed, and the discharge port
The check valve 17 is pushed open from 13 to enter the discharge chamber 42, from which it is discharged to the outside via the discharge pipe 83.

At the same time, the oil pump 51 is driven by the rotary shaft 5, and the lubricating oil 57 stored in the bottom of the closed housing 8 is sucked up through the oil suction pipe 56. The lubricating oil discharged from the oil pump 51 passes through the oil supply hole 52 to the rear bearing.
72, after lubricating the front bearing 71 to lubricate them and lubricate the eccentric pin 53, the drive bush 54, the swivel bearing 73, etc., return to the bottom of the sealed housing 8 through the oil drain hole 62.

[0011]

In the conventional horizontal hermetic electric compressor described above, when rotating members such as the compression mechanism C, the rotor Ma of the electric motor M, and the rotary shaft 5 rotate, the hermetically sealed housing is accordingly moved. The gas in 8 also rotates. Then, the liquid surface of the lubricating oil 57 stored in the inner bottom portion of the closed housing 8 is urged by the flow of the gas and tilts in the rotation direction as shown in FIG. On the other hand, the amount of oil rising (meaning the amount of lubricating oil sucked into the compression mechanism and discharged together with the discharged gas) increases, and the amount of oil returned (lubricating oil returning to the closed housing 8 with the suction gas) When the lubricating oil 57 stored in the inner bottom of the closed housing 8 decreases due to lack of the oil amount, and the height of the liquid level 58 decreases to h ₁ or less, the oil suction pipe 56 of the oil pump 51 becomes a rotary shaft. 5, the lower end opening of the oil absorption pipe 56 is exposed above the liquid level 58 of the lubricating oil 57, so that lubrication becomes impossible, which may cause poor lubrication or abnormal wear or seizure based on the lubrication. was there.

[0012]

Means for Solving the Problems The present invention was invented to solve the above problems, the place to its gist, a built-in compression mechanism and the electric motor in a hermetic housing of Yoko置 The compression mechanism is connected to one end of a substantially horizontally extending rotary shaft of the electric motor, and
An oil pump driven by the rotary shaft is installed at the other end of the rotary shaft, and a horizontal-type hermetic electric motor is formed by opening the end of an oil suction pipe of the oil pump into the lubricating oil stored in the bottom of the closed housing. In the compressor, the end of the oil absorption pipe is opened at a position deviated by a predetermined angle with respect to the vertical direction along the rotation direction of the electric motor.

[0013]

According to the present invention, since the above structure is provided, even if the liquid level of the lubricating oil stored in the inner bottom of the sealed housing is inclined, it is possible to suppress the tip opening of the oil supply pipe from being exposed on the liquid level. .

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG. As shown in FIG. 1, the oil absorption pipe 56 is inclined so as to be perpendicular to the inclined liquid level 58 of the lubricating oil 57 stored in the bottom of the sealed housing 8. Is positioned at a position deviated by a predetermined angle θ from the vertical direction along the rotation direction of the electric motor shown in FIG.
The other configuration is the same as that of the conventional one shown in FIGS. 2 and 3, and corresponding members are denoted by the same reference numerals.

During the operation of the compressor, the liquid level 58 of the lubricating oil 57 stored in the inner bottom of the closed housing 8 is inclined as shown in the figure. Then, even if the liquid level 58 of the lubricating oil 57 decreases due to an increase in the amount of oil rising or an insufficient amount of oil return, etc.
Exposure of the tip opening 59 of the 56 on the liquid surface 58 can be suppressed.
In other words, Madeabura pump liquid level is reduced to h ₂ below
Since 51 can suck lubricating oil, the operating range of the compressor can be increased and its reliability can be improved.

[0016]

According to the present invention, since the tip of the oil suction pipe of the oil pump is opened at a position deviated by a predetermined angle with respect to the vertical direction along the rotation direction of the electric motor, the oil suction pipe is stored in the bottom of the closed housing. Even when the liquid level of the lubricating oil is inclined, it is possible to prevent the tip end opening of the oil supply pipe from being exposed on the liquid level. As a result, poor lubrication of the compressor or abnormal wear and seizure based on the poor lubrication can be prevented to improve the reliability of the compressor.

[Brief description of the drawings]

FIG. 1 is a view corresponding to FIG. 3, showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional horizontal hermetic electric compressor.

FIG. 3 is a view as viewed from an arrow AA in FIG. 2;

[Explanation of symbols]

 8 Sealed housing C Compression mechanism M Electric motor 5 Rotary shaft 51 Oil pump 57 Lubricating oil 58 Liquid level 56 Oil supply pipe 59 Tip opening

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04C 23/00-29/10 331

Claims (1)

(57) [Claims] 1. A built-in compression mechanism and an electric motor within a sealed housing of Yoko置 and substantially connecting the compression mechanisms to one end of the rotary shaft horizontally extending of the electric motor DOO
An oil pump driven by the rotary shaft is installed at the other end of the rotary shaft, and a tip of an oil absorption pipe of the oil pump is opened in lubricating oil stored in a bottom portion of the closed housing. A hermetically-sealed electric compressor, wherein a tip of the oil absorption pipe is opened at a position deviated by a predetermined angle with respect to a vertical direction along a rotation direction of the electric motor.