JPH0121190Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hermetic compressor, and more particularly to an oil separation structure for a hermetic compressor.

[Conventional technology]

Conventionally, the oil separation structure of a hermetic compressor has been a structure as disclosed in, for example, Japanese Utility Model Application Publication No. 57-73395. This conventional oil separation structure will be explained with reference to FIG. 2. The conventional hermetic compressor is equipped with a compression element 2 in the lower part of the hermetic container 1 for compressing gas sucked through a suction pipe 8. An electric element consisting of a rotor 5 and a stator 4 for driving the compression element 2 via a crankshaft 3 is housed in the upper part of the closed container 1 .

In this conventional hermetic compressor, the compression element 2
The discharged gas discharged from the discharge valve 7 flows to the upper part of the sealed container 1 through the air gap, which is the gap between the rotor 5 and the stator 4, and the notch provided on the outer periphery of the stator, as shown by the arrow in FIG. ,
It leads to a discharge pipe 9 that connects the upper part of the sealed container and an external device. At this time, the end of the discharge pipe 9 is positioned within the end ring 6 of the rotor 5 in order to prevent the refrigerating machine oil 17 at the bottom of the sealed container from mixing with the discharge gas and coming out from the discharge pipe 9 to an external device. was. As a result, as the rotor 5 rotates, the discharge gas and the refrigerating machine oil 17 are separated by the centrifugal effect near the center of rotation, and almost only the discharge gas can be discharged from the discharge pipe 9.

[Problem that the invention attempts to solve]

By the way, it is desirable to position the end of the discharge pipe 9 several millimeters or more inside the end face of the end ring 6, but there is a drawback that the height of the end ring 6 cannot be made sufficiently high due to the characteristics of the motor. .

Further, since there is little space for the discharge gas to flow from the lower part to the upper part of the electric element, the discharge flow rate increases, and there is a possibility that the ratio of refrigerating machine oil 17 being lifted to the upper part and mixed into the discharge gas may be increased. In order to prevent this, an air hole 10 may be provided in the rotor 5 in order to ensure a cross-sectional area of the discharge gas passage. In such a case, the conventional technique has the disadvantage that the discharged gas, which is not separated from the oil, is directly discharged from the air hole.

Therefore, an object of the present invention is to improve the centrifugal separation effect between the discharged gas and the refrigerating machine oil due to the rotation of the rotor, regardless of the height of the end ring related to the motor characteristics, and to improve the centrifugal separation effect between the discharge gas and the refrigerating machine oil by the rotor. To provide a hermetic compressor which prevents discharged gas that is not separated from oil from flowing out from the air hole even when the air hole is provided.

The hermetic compressor of the present invention is equipped with an oil separation plate on the end ring of the rotor.

[Effect]

According to the present invention configured as described above, the discharge gas mixed with refrigerating machine oil collides with the rotating oil separation plate and is scattered around it, so that only the centrifuged discharge gas is sent to the end of the discharge pipe. The oil is discharged from the discharge pipe through a concave portion of an oil separation plate configured to cover the oil from below.

〔Example〕

Hereinafter, the hermetic compressor of the present invention will be described in more detail with reference to embodiments shown in the accompanying drawings.

1 and 3 show a hermetic compressor according to an embodiment of the present invention. In the hermetic compressor of this embodiment, an oil separation plate 1 made of metal or resin is integrally formed with a concave central portion on the end ring 6 on the side opposite to the compression element of the rotor 5 as shown in FIG.
1 is attached, and the end of the discharge pipe 9 is positioned within the recess of this oil separation plate 11.

Attaching the oil separation plate 11 to the end ring 6 is as follows:
As shown in FIG. 3, the end ring 6 is crimped and fixed by a crimping pin 12 provided on the end ring 6 and a crimping hole 13 formed in the oil separation plate.

Since such an oil separation plate 11 is attached to the end ring 6 on the side opposite to the compression element of the rotor, and the end of the discharge pipe 9 is positioned within the recess, the discharge gas and refrigerating machine oil are separated between the rotor 5 and the stator 4. Even if the air flows to the top of the sealed container 1 through the air gap and the notch provided on the outer periphery of the stator, it collides with the lower surface of the oil separation plate 11 and is blown around by the rotating oil separation plate and is centrifuged. The gas is separated and only the discharge gas is discharged from the discharge pipe 9.

Further, FIG. 5 shows another embodiment of the present invention. In this embodiment, the oil separation plate 11 is the sixth
As shown in the figure, it is composed of a disc 14 and a cup part 15 made of a cup-shaped plate member placed on the upper surface of the central part of the disc 14.
and are fixed together by welding or a fixing rod 16, and are fixed to the crankshaft 3 by the fixing rod 16. In this case as well, the end of the discharge pipe 9 is positioned within the cup 15 in the same way.

Further, FIGS. 7 to 10 show various shapes of the oil separation plate 11 according to the present invention. The oil separation plate 11 having such a shape also provides similar effects.

[Effect of idea]

As explained above, according to the hermetic compressor of the present invention, by installing the oil separation plate, oil separation is achieved by the centrifugal separation effect caused by the rotation of the rotor, regardless of the height of the end ring related to the motor characteristics. can be done. Further, even if the rotor 5 is provided with the air holes 10, the effect remains the same.

Furthermore, the diameter and height of the recessed portion of the oil separation plate can be freely changed, making it possible to obtain an optimal oil separation state.

In addition, by using such an oil separation plate, even under adverse conditions such as high-speed operation using an inverter, etc., which increases the discharge gas flow rate and increases the contamination rate of refrigerating machine oil, the oil circulation amount (refrigerating machine oil percentage in the gas) The amount of machine oil) is reduced to approximately 1/10 of the conventional level, which prevents a decrease in compressor life and reliability due to refrigerating machine oil spills, and also prevents a decrease in the heat exchange performance of the equipment, evaporator, and condenser, significantly improving the performance of the system. can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hermetic compressor according to an embodiment of the present invention, FIG. 2 is a sectional view of a conventional hermetic compressor, and FIG. FIG. 4 is a sectional view showing the oil separation plate used in the hermetic compressor shown in FIG. 1, and FIG. 5 is another embodiment of the present invention. 6 is a sectional view showing an oil separation plate used in the embodiment shown in FIG. 5, and FIGS. 7 to 10 are views showing still other embodiments of the present invention. It is a sectional view showing an oil separation plate concerning an example. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Compression element, 3... Crankshaft, 5... Rotor, 6... End ring, 9... Discharge pipe, 11... Oil separation plate, and the same reference numerals in the drawings are the same. Indicates a part or a corresponding part.

Claims (1)

[Claims for Utility Model Registration] (1) A rolling piston driven via a crankshaft, a cylinder housing the rolling piston, an upper bearing that seals the upper and lower parts of the cylinder and supports the crankshaft, and In a hermetic compressor comprising a compression element having a compression chamber formed by a lower bearing and an electric element comprising a rotor and a stator for driving the crankshaft, which are housed in a closed container, a side opposite to the compression element of the rotor. An oil separation plate made of metal or resin is attached to the end ring or the crankshaft, and an end portion of a discharge pipe connected to an external device from the airtight container that protrudes toward the airtight container is formed in the center of the oil separation plate. A hermetic compressor characterized by being positioned within a recess. (2) The hermetic compressor according to claim 1, wherein the oil separation plate is a circular plate having a concave center. (3) The oil separation plate is composed of a disc and a cup-shaped member placed on the disc, and the disc and the cup-shaped member are fixed directly or fixed together by a fixing rod. A hermetic compressor according to claim 1 of the utility model registration claim.