JPH11303748A - Hermetic electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a refrigeration oil feed to a scraping part of a compression element so as to reduce a noise in a hermetic electric compressor that is loaded, e.g. into an electric refrigerator. SOLUTION: An oil feed pipe 5 comprising a centrifugal pump 5a and a concentric revolving part 5b is attached to a bottom tip of a crankshaft 4 so that only the concentric revolving part 5b revolves in refrigeration oil. Accordingly, the agitation of the refrigeration oil and a noise thereof are prevented. Also, by a gas vent 7 being formed in the oil feed pipe 5, a gas layer that inhabits a refrigeration oil feed is vented into the outside of the oil feed pipe 5 and thus the refrigeration oil feed to a scraping part of a compression element is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic electric compressor mounted on an electric refrigerator or the like.

[0002]

2. Description of the Related Art In recent years, a hermetic electric compressor (hereinafter referred to as a compressor) has been required to have a quiet operation sound, and various noises generated inside the compressor have been improved. .

Hereinafter, an example of a conventional compressor will be described with reference to the drawings. 6 and 7 show a conventional compressor. Reference numeral 51 denotes an airtight container, 52 denotes a compression element elastically supported in the airtight container 51, and 53 denotes an electric element disposed above the compression element 52.

[0004] Reference numeral 54 denotes a crankshaft that is driven to rotate by an electric element 53, 55 denotes an oil supply pipe attached to the lower end of the crankshaft 54, and 56 denotes refrigerating machine oil sealed in a closed container 51.

The operation of the compressor configured as described above will be described below. An oil supply pipe 55 composed of a centrifugal pump section 55a attached to the lower end of a crankshaft 54 driven to rotate by an electric element 53
1 rotates in the refrigerating machine oil 56 enclosed therein, and pumps the refrigerating machine oil 56 from the opening 61 to supply the refrigerating machine oil 56.

[0006]

However, in the above configuration, since the centrifugal pump portion 55a rotates in the refrigerating machine oil 56, the oil supply pipe 55 cuts the oil surface into a slash-like shape, and the refrigerating machine oil is violated. Skip it.

[0007] The sound generated when the oil supply pipe cuts the oil surface, the sound of the splashed refrigerating machine oil colliding with the oil surface, the inner wall of the sealed container, the compression element, and the like, and the noise caused by the oil supply pipe cutting the oil surface. The sound that resonates when shaken has the problem of increasing the compressor noise.

The present invention has been made in consideration of the above problems, and has as its object to reduce noise caused by reducing oil agitation by a refrigerating pipe and to ensure lubrication of a sliding portion of a compression element.

[0009]

In order to solve the above problems, the present invention comprises an oil supply pipe comprising a centrifugal pump section and a concentric rotating section at the lower end of a crankshaft.

[0010] Thereby, the refrigerating machine oil is prevented from being agitated by the centrifugal pump unit, and the oil surface cut-off sound, the refrigerating machine oil splashing sound,
The resonance noise of the oil supply pipe can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is provided with an oil supply pipe comprising a centrifugal pump section and a concentric rotating section at a lower end of a crankshaft, and an oil level inside the concentric rotating section. It has a function of supplying refrigerating machine oil to the centrifugal pump section by the lifting head, and supplying refrigerating machine oil to each sliding section of the compression element by the centrifugal pump action of the centrifugal pump section.

According to a second aspect of the present invention, the centrifugal pump is located above the oil level of the refrigerating machine sealed in the sealed container, and the centrifugal pump of the oil supply pipe has an oil level. It has the effect of rotating upward.

According to a third aspect of the present invention, at least one or more gas vent holes are provided in an oil supply pipe, and air bubbles sucked from an opening at a tip of the oil supply pipe and foams inside the oil supply pipe are formed. It has the function of discharging the gas generated by the above to the outside of the oil supply pipe.

According to a fourth aspect of the present invention, a vent hole is provided in the direction of the center of rotation of the centrifugal pump section. It has the function of effectively discharging the gas layer generated in the oil supply pipe, which accumulates on the side of the rotation center in the pipe by climbing over the wall, to the outside of the pipe.

According to a fifth aspect of the present invention, a coil spring is provided inside the concentric rotating part, and the pumping ability of the concentric rotating part is improved by rotating the coil spring together with the concentric rotating part. It has the effect of being able to.

According to a sixth aspect of the present invention, an oil supply plate is provided inside the concentric rotating portion, and the pumping ability of the concentric rotating portion can be improved by the effect of scraping the refrigerating machine oil of the oil supply plate. It has the action of:

According to a seventh aspect of the present invention, a spiral groove is provided on the inner side of the concentric rotation, and the pumping ability of the concentric rotary part can be improved by the effect of scraping the refrigerating machine oil of the spiral groove. Has an action.

According to an eighth aspect of the present invention, the diameter of the opening of the oil supply pipe opened in the refrigerating machine oil is made smaller than the inner diameter of the concentric rotating part, and the opening diameter of the opening is made smaller. This has the effect that air bubbles in the refrigerating machine oil can be suppressed from flowing into the oil supply pipe.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of a compressor of the present invention, and FIG. 2 is a perspective view of a main part of FIG.

In FIGS. 1 and 2, reference numeral 1 denotes a closed container, 2 denotes a compression element, 3 denotes an electric element, and 4 denotes a crankshaft constituting the compression element 2. The crankshaft 4a is located below the main shaft 4a. Eccentric shaft portion 4b. Reference numeral 5 denotes an oil supply pipe attached to the lower end of the crankshaft 4,
It comprises a centrifugal pump section 5a and a concentric rotating section 5b continuous with the centrifugal pump section 5a.

Reference numeral 6 denotes a refrigerating machine oil sealed in the closed vessel 1 and stored at the bottom of the closed vessel 1. Reference numeral 7 denotes a gas vent hole provided on the upper surface side of the oil supply pipe 5. Reference numeral 11 denotes an opening provided at the end of the concentric rotating part 5 b of the oil supply pipe 5, and opens into the refrigerator oil 6 stored at the bottom of the sealed container 1.

In the above configuration, the crankshaft 4 is rotated by the action of the electric element 3 to rotate the oil supply pipe 5 attached to the lower end thereof. At this time, only the concentric rotating part 5b of the oil supply pipe 5
Since it rotates inside, there is no occurrence of oil slicing and the refrigerating machine oil 6 does not splash.

[0024] Therefore, the generation of the oil surface noise and the noise caused by the refrigerating machine oil that has been splashed is also eliminated. Further, since the vibration of the oil supply pipe 5 is small, the generation of noise due to the resonance of the oil supply pipe 5 is also reduced.

Further, the concentric rotating part 5b is opened through the opening 11 to the refrigerating machine oil 6 sealed in the closed container 1, and the refrigerating machine oil 6 in the concentric rotating part 5b rotates the concentric rotating part 5b. The liquid is supplied to the centrifugal pump section 5a by the lift due to the movement.

Refrigeration oil 6 supplied to centrifugal pump section 5a
Is further fed upward by the centrifugal pump capacity of the centrifugal pump section 5a and supplied to each sliding surface of the compression element 2 to contribute to lubrication of the sliding surface.

Further, the gas inside the oil supply pipe 5 is discharged to the outside of the oil supply pipe 5 by the gas vent hole 7 provided in the oil supply pipe 5, thereby preventing the supply of the refrigerating machine oil 6 from being hindered.

According to another embodiment, as shown in FIG. 3, a coil spring 8 whose free outer diameter is larger than its inner diameter is inserted into a concentric rotating portion 5b constituting the oil supply pipe 5, and 8 and is fixed to the inner wall of the concentric rotating part 5b.

In the above configuration, the concentric rotating part 5
By rotating the coil spring 8 together with b, the pumping ability of the concentric rotating part 5b can be improved by the effect of the coil spring 8 for scraping the refrigerating machine oil.

According to another embodiment, as shown in FIG. 4, an arc-shaped oil supply plate 9 having a free width larger than its inner diameter is inserted into a concentric rotating part 5b constituting an oil supply pipe 5, Refueling plate 9
Is fixed to the inner wall of the concentric rotating part 5b.

In the above configuration, the concentric rotating part 5
By rotating the refueling plate 9 together with b, the pumping capability of the concentric rotating part 5b can be improved by the effect of scraping the refrigerating machine oil of the refueling plate 9.

Further, according to another embodiment, as shown in FIG. 5, a spiral groove is formed on the inner wall of the concentric rotating portion 5b constituting the oil supply pipe 5 by tapping or the like.

In the above configuration, the spiral groove 10
The pumping ability of the concentric rotating part 5b can be improved by the refrigerating machine oil scraping effect.

[0034]

As is apparent from the above embodiment, according to the first aspect of the present invention, the concentric rotating part provided in the oil supply pipe is rotated in the refrigerating machine oil, and the refrigerating machine oil is supplied to the upper centrifugal pump part. The oil supply mechanism that supplies the oil to each sliding part of the compression element further reduces the oil leveling and splashing of the refrigeration oil due to the rotation of the oil supply pipe, thereby reducing the generation of noise. By reducing the vibration of the oil supply pipe, the advantageous effect of reducing the generation of the resonance noise can be obtained.

According to the second aspect of the present invention, the centrifugal pump section is located above the oil level of the refrigerating machine sealed in the sealed container, whereby the slick oil level formed by the oil supply pipe is provided. The advantageous effect that the splashing of the cutting and refrigerating machine oil can be eliminated and the noise of the oil level cut by the oil supply pipe and the splashing sound of the refrigerating machine oil can be eliminated.

According to the third aspect of the present invention, at least one or more gas vent holes are provided in the oil supply pipe, and the air bubbles sucked from the opening at the tip of the oil supply pipe and the bubbles inside the oil supply pipe are formed. By discharging the gas generated by the above to the outside of the oil supply pipe, an advantageous effect that a gas pool inside the oil supply pipe which hinders the supply of the refrigerating machine oil to each sliding portion of the compression element can be avoided can be obtained.

According to the fourth aspect of the present invention, the vent hole is provided in the direction of the center of rotation of the centrifugal pump section, and the refrigerating machine oil is rotated by centrifugal force in the centrifugal pump section pipe of the oil supply pipe. The advantageous effect that the gas layer generated in the oil supply pipe, which accumulates on the side of the rotation center in the pipe by climbing over the inner wall in the direction, can be effectively discharged to the outside of the pipe and gas accumulation can be avoided. .

According to the fifth aspect of the present invention, the coil spring is disposed inside the concentric rotating portion, and the pumping ability of the concentric rotating portion is improved by rotating the coil spring together with the concentric rotating portion. Thus, the advantageous effect that the refrigerating machine oil supply capacity to each sliding portion of the compression element can be improved can be obtained.

According to the sixth aspect of the present invention, the oil supply plate is disposed inside the concentric rotating portion, and the pumping ability of the concentric rotating portion is improved by the effect of scraping the refrigerating machine oil of the oil supply plate, and the oil supply is performed. The advantageous effect that the refrigerating machine oil supply capacity to each sliding portion of the compression element can be improved by adding a simple part of inserting a plate.

According to the seventh aspect of the present invention, the spiral groove is provided inside the concentric rotating part, and the pumping ability of the concentric rotating part is improved by the effect of scraping the refrigerating machine oil of the spiral groove, and the compression is improved. An advantageous effect is obtained that the refrigerating machine oil supply capacity to each element slide can be improved without newly adding components.

According to the eighth aspect of the present invention, the diameter of the opening opened in the refrigerating machine oil is smaller than the inner diameter of the concentric rotating part. By reducing the opening diameter of the opening, An advantageous effect is obtained in that bubbles in the refrigerating machine oil are prevented from flowing into the oil supply pipe, and the formation of a gas reservoir that hinders the supply of the refrigerating machine oil to the compression element can be avoided.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a compressor according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of FIG. 1;

FIG. 3 is a longitudinal sectional view of an oil supply pipe according to another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a fuel supply pipe according to another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of an oil supply pipe according to another embodiment of the present invention.

FIG. 6 is a side view of a main part showing a conventional compressor.

FIG. 7 is a perspective view of a main part of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression element 3 Electric element 4 Crankshaft 4a Main shaft part 4b Eccentric shaft part 5 Oil supply pipe 5a Centrifugal pump part 5b Concentric rotation part 6 Refrigerator oil 7 Gas vent 8 Coil spring 9 Oil supply plate 10 Spiral groove 11 Opening

Claims (8)

[Claims] 1. A compression element 2 and an electric element 3 elastically supported in a closed container, wherein the compression element comprises a crank comprising a main shaft 4a and an eccentric shaft 4b driven to rotate by the electric element. An oil supply pipe 5 having a shaft 4 and communicating with an oil groove formed on the outer periphery of the crankshaft, a lower end portion comprising a centrifugal pump portion 5a and a concentric rotating portion 5b with respect to a main shaft portion continuous with the centrifugal pump portion; A hermetic electric compressor in which the oil supply pipe 5 opens and rotates in refrigerating machine oil 6 sealed in the hermetic container 1. 2. The hermetic electric compressor according to claim 1, wherein the centrifugal pump is located above an oil level of the refrigerating machine oil sealed in the hermetic container. 3. The hermetic electric compressor according to claim 1, wherein at least one gas vent hole is provided in the oil supply pipe. 4. The hermetic electric compressor according to claim 1, wherein a gas vent hole is provided in the direction of the center of rotation of the centrifugal pump. 5. The hermetic electric compressor according to claim 1, wherein a coil spring is disposed inside the concentric rotating part. 6. The hermetic electric compressor according to claim 1, wherein an oil supply plate is disposed inside the concentric rotating portion. 7. The hermetic electric compressor according to claim 1, wherein a spiral groove is provided inside the concentric rotating part. 8. The hermetic electric compressor according to claim 1, wherein the diameter of the opening of the oil supply pipe opened into the refrigerating machine oil is smaller than the inner diameter of the concentric rotating part.