JPH0281972A - Rotary compressor - Google Patents

Abstract

PURPOSE:To obtain a compressor, providing a lubricating oil outflow-preventing device of high reliability with a less pressure drop, by coating the inlet of a delivery pipe with an oil separating cover having a separating wall surface, oil separating cover inflow port and an oil outflow port. CONSTITUTION:An oil separating cover 25 is mounted in its flange part to a closed vessel 1 by welding. Thus, in accordance with an operative condition, similarly to a conventional compressor, a fine drip of oil comes rising with a refrigerant to upper part space 19 of a motor. The drip of oil is allowed to flow in the tangential direction from an oil separating cover inlet 27 of small resistance, colliding against an oil separating wall surface 26 of a cylinder of almost circular section, adhering to the wall surface 26, being allowed to flow along it and dropping. The oil is allowed to flow into a resistance unit 28 from a mounting plate oil downflow hole 30a further formed into a large drip of oil dripping down to the upper part space 19 of the motor in the outside of the oil separating cover 25 from an oil outflow port 29, and the oil is allowed to flow down to motor bottom part space from a stator communication hole 18, returning to an oil reservoir in the bottom part of the closed vessel 1 and being supplied to each sliding part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in zero-tary compressors, and particularly to improvements in preventing lubricating oil from flowing out of the compressor.

[Conventional technology]

A conventional rotary compressor will be explained with reference to FIGS. 6 and 7. FIG. 6 is a longitudinal sectional view, and in the same figure, l denotes a closed container, in which a motor 4 consisting of a stator 2° and a rotor 3 and a compressor @ 5 for compressing refrigerant are housed. . The compression machine section 5 includes a cylinder 6, a cylinder block 7, a piston 8, a shaft 9. It is composed of a main bearing 10° and a sub-bearing 11 which also serve as cylinder side plates. These parts? The combined compressor 12 includes a condenser 13. Aperture v1
4. It is connected to the evaporator 15, etc. It operates as a refrigeration cycle.

The refrigerant in the refrigeration cycle is sucked into the compressor 12 from a suction pipe 116 connected to the evaporator 15, compressed by the compressor machine section 5, and discharged into the motor lower space 17.

And stator communication hole 18 or.

It flows into the motor upper space 19 through the gap between the stator 2 and rotor 3, is discharged from the compressor 12 by the discharge vibrator 20, and is discharged from the condenser 13. It returns to the evaporator 15 via the throttle v14.

In addition, the sliding parts 0 of the compressor machine part 5, for example, between the shaft 9 and the main bearing 10 or the sub-bearing 11, between the shaft 9 and the piston 8, between the piston 8 and the main bearing or the sub-bearing 11, etc. It is lubricated with lubricating oil 22 supplied by an oil supply pump 21.

In such a compressor 12, depending on the operating conditions, for example, during flat speed operation, cold start, or load removal operation, the lubricating oil may be lost due to stirring of the rotor 3 or pressure fluctuations in the closed container 1. 22 is lifted up to the motor upper space 19 together with the refrigerant and flows out from the discharge vibrator 20, and the oil level in the oil reservoir at the bottom of the closed container l decreases, making it difficult to supply sufficient oil to the sliding parts. May cause fear.

Does this kind of lubricating oil 22 leak from the discharge pipe? Several structures have been proposed to prevent this.

One method is to use the rotation of the rotor 3 of the motor 4 to provide a rotating part for oil separation at the tip of the rotor 3 or shaft 9, as described in Japanese Patent Laid-Open No. 58-17089.
No. 3, Utility Model No. 59-27168, Utility Model No. 59-286
No. 85 1% Kaisho 60-145484, Jitsuma 60-10
No. 5880, Jitsuma 61-63489, Jitsuma 61-88
It has been proposed in No. 081, etc. An example of this is shown in FIG. 6, in which a filter material 23 is attached to the shaft 9, and the inlet of the discharge pipe 20 is covered with it. In addition, as another method, 0, for example, the 7th rotation part is not provided.
As shown in the figure, the inlet of the discharge pipe 20 is connected to a porous filter 2.
4 (Utility Model Publication No. 47-38964) has been proposed. Furthermore, in larger refrigeration equipment, the compressor 1
Some products employ a method in which an oil separator is provided outside of 2 (not shown).

[Problem to be solved by the invention]

In the above-mentioned series of conventional methods in which two rotating parts are rotated, it is necessary to sufficiently balance the rotation of each rotating part, and there are aspects in which two rotations cannot be said to be advantageous in terms of cost or reliability. there were. In particular, as a recent trend, the speed of rotation speed controlled compressors using inverters has increased, making it difficult to ensure reliability. Furthermore, in the method of covering the entrance of the discharge pipe with a filter without using a single-rotation component, there is a problem in the pressure loss of the refrigerant gas in order to sufficiently separate the oil.

Also, the oil separator is installed outside the compressor.

It is difficult to return the separated lubricating oil to the compressor.

If the oil is returned to the suction vibrator of the compressor, the performance will inevitably deteriorate, and if an oil return pump is provided to directly return the oil to the airtight container, the cost will be extremely high.

An object of the present invention is to provide a compressor with a low pressure loss (and a highly reliable lubricating oil spill prevention device).

[Means to solve the problem]

The above object is achieved by covering the inlet of the discharge pipe from the closed container of the compressor with an oil separation cover as follows. In other words, the axis of the oil separation cover ((the oil separation cover inlet, which is disposed in the substantially welding direction of the separation wall surface and the separation wall surface such that the cut surface on the vertical plane is approximately circular; The objective is achieved by covering the inlet of the discharge pipe with an oil separation cover which has an oil outlet opening out of the oil separation cover through a resistor at the bottom.

[Effect]

By covering the inlet of the discharge pipe with an oil separation cover as described above, the refrigerant containing fine oil droplets flowing into the oil separation cover will flow from the connection direction, so it will remain in a Y-circular shape. It gradually moves toward the inlet of the discharge pipe in the center while making a smooth swirling motion along the separation wall surface. During this swirling motion, the oil droplets, which have a higher specific gravity than the refrigerant gas, collide with the wall surface, adhere to the wall surface, become immersed in the wall surface, and flow down. The oil then soaks into a resistor made of a wire mesh or porous material provided at the bottom of the oil separation cover, and from there flows out of the oil separation cover through the oil outlet. on the other hand.

The refrigerant that is removed as oil droplets while making this swirling motion is
It is discharged out of the compressor from the inlet of the discharge pipe. Note that the refrigerant does not flow into the oil separation cover from the oil outlet of the oil separation cover to the extent that the flow resistance of the resistor prevents the oil from flowing out.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. Note that parts that are the same as those in the prior art are designated by the same reference numerals, and a description of the structure will be omitted.

Figure 1 is a longitudinal sectional view, Figure 2 is a sectional view taken along line A = A in Figure 1, and Figure 3 is the closed container 1 and 20ft discharge pipe in Figure 1.
: It is a diagram showing a part of the oil separation cover 25 in cross section after being removed and viewed from the direction of arrow B. In these figures, 26
27 is a cylindrical separation wall surface, 27 is an oil separation cover provided almost tangentially to the separation wall surface 26; The resistor 29 is provided on the bottom of the oil separation cover 25. The mounting plate 630α for fixing the resistor 28 is used to prevent oil spillage. The mounting plate oil flow hole 25 is an oil separation cover formed from these.The oil separation cover 25 is attached at its 7272 portion 25α to the closed container l by welding.

Next, we will discuss the oil separation mechanism. As with the conventional compressor 12, depending on the operating conditions, fine oil droplets may rise together with the refrigerant into the motor upper space 19. Then, the oil droplets flow tangentially from the oil separation cover where there is less resistance, collide with the cylindrical oil separation wall 26 whose cross section is approximately circular, and
6&r-adhesion 1- overflows onto the wall surface 26 and flows down. Then, the oil flows into the resistor 28 from the mounting plate oil flow hole 30α, and further drips into the motor upper space 19 outside the oil separation cover 25 from the oil outflow port 29 as a large oil droplet, and the stator communication hole 1
8 into the space below the motor and return to the oil sump at the bottom of the sealed container 1.

Each sliding part is supplied with oil.

By attaching the oil separation cover 25 to the airtight container l as in this embodiment, reliability is greatly improved compared to the case where parts for oil separation are attached to the rotor 3 or shaft 9 and rotated. It will be advantageous. In addition, it is advantageous in terms of cost because it can be easily attached directly to the inside of the closed container l by spot welding or the like using the flange portion 25α of the oil separation cover 25.

Next, regarding pressure loss due to the flow of refrigerant, since the oil separation cover inlet 27 is provided in the tangential direction of the oil separation wall surface 26, it is possible to obtain a smooth swirling flow for oil separation without generating a large pressure loss. I can do it.

High performance can be maintained. Also, connect the tip of the oil outlet 29 to the top of the rotor 3 with i! ! By providing the oil droplets above the stator 2, large oil droplets flowing out from the oil separation cover 25 are difficult to atomize again on the upper surface of the rotor 3.
The oil droplets can easily flow directly into the motor lower space 17.

Next, FIG. 4 shows an embodiment that places more emphasis on cost.

It is shown in FIG. Figure 4 shows arrow B in Figure 1, similar to Figure 2.
FIG. 5 is a partial view seen from the direction, and FIG. 5 is a C-Cm in FIG.
FIG. In this embodiment, the separation cover inlet 27 is not attached to the separation wall surface 26 by a separate pipe as in the previous embodiment shown in FIG. This figure shows a structure in which the parts are cut and pushed in. By doing so, the number of parts can be reduced and costs can be reduced.

As is clear from these two embodiments, in the present invention, since the oil separation cover 25 is provided inside the closed container 1, the separated lubricating oil is directly transferred to the bottom of the closed container 1 using gravity. The lubricating oil can be returned to the oil reservoir of This is advantageous in terms of performance and cost, such as increased cost.

〔Effect of the invention〕

According to the present invention, the refrigerant containing oil droplets is caused to flow into the oil separation cover from the oil separation cover provided on the separation wall surface in the V tangential direction, and is smoothly led to swirling operation to trap oil droplets on the separation wall surface. Since the collected lubricating oil can be returned to the outside of the oil separation cover from the oil outlet through the resistor, the pressure loss for oil separation can be reduced, and a new Since there is no need to provide a rotating part for oil separation in the compressor, reliability and cost can be improved, and a compressor with a good balance of performance, reliability, and cost with less leakage of lubricating oil can be provided.

[Brief explanation of the drawing]

Figures 1 to 5 are structural explanatory diagrams of an embodiment of the present invention, Figures 6 and 7 are cross-sectional views showing conventional examples, and Figure 1 is a longitudinal cross-section of an embodiment of the compressor of the present invention. Figure 2 is A-A of Figure 1.
3 is a partial view taken in the direction of arrow B in FIG. 1, FIG. 4 is a partial view corresponding to FIG. 3 of another embodiment, and FIG. 5 is a sectional view taken along line C-C in FIG. 3. 6 is a longitudinal cross-sectional view of the compressor, and FIG. 7 is a partial cross-sectional view of the compressor. ■...Airtight container, 4...Motor. 5... Compressor machine section, 20... Discharge pipe. 25...Oil content, rain cover 26...Separation wall surface. 27...Oil separation cover inlet. 28...Resistor, 29...Oil outlet.

Claims (1)

[Claims] 1. In a rotary compressor that has at least a motor and a compressor machine part in a closed container, and the inlet of a discharge pipe from the closed container is covered with an oil separation cover, the cross section of the oil separation cover in a plane perpendicular to the axis is approximately The oil separation cover has a circular separation wall surface, an oil separation cover inlet in a direction substantially tangential to the separation wall surface, and an oil separation cover provided with an oil outlet communicating with the outside of the oil separation cover via a resistor at the bottom of the oil separation cover. A rotary compressor characterized by: