JPS63124892A - rotary compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary compressor, and particularly to a compressor suitable for reducing the amount of refrigerating machine oil flowing out from the compressor.

[Conventional technology]

A conventional rotary compressor will be explained with reference to FIGS. 17 and 18. FIG. 17 is a longitudinal sectional view, and FIG.
It is a sectional view taken along the F line. In the figure, reference numeral 1 denotes an airtight container, and inside the airtight container 1 there is a discharge pipe 21K on the upper end surface of the airtight container 1. A motor upper space 20. Motor 11, motor lower space 1
8 and a suction pipe 1 having an oil reservoir for refrigerating machine oil 12 at the lower end.
A compressor mechanical section 8 communicating with 7 is disposed. 2 is a cylinder, 3 is a cylinder block, 4 is a piston, and 5 is a shaft.

6.7 is the upper bearing that also serves as the cylinder side plate.

This is the lower bearing. The motor 11 has a stator 9. The rotor consists of 10. 15 is a compressor, a condenser 14. Aperture 15
It is connected to the evaporator 16 and the like, and operates as a refrigeration cycle. The refrigerant is then sucked into the compressor 13 from a suction pipe 17 connected to the evaporator 16, compressed by the compressor machine section 8, and discharged into the motor lower space 18. Then, the motor upper space 2 passes through the stator communication hole 19.
0 flows into the compressor 16 through the discharge pipe 21 and is discharged from the condenser 14. It returns to the evaporator 16 via the throttle 15.

In such a compressor, depending on the operating conditions, the refrigerating machine oil 12 may be lifted up together with the refrigerant into the motor upper space 20K, and the discharge pipe 21 may also flow out, causing the oil level of the refrigerating machine oil 12 in the oil sump to drop. pump piece 2
2, it may become difficult to supply sufficient oil to the sliding parts. In order to avoid this, the refrigerating machine oil 12 that has risen to the motor upper space 20 is returned to the motor lower space 18 by enlarging the stator communication hole 19 and reducing the refrigerant velocity from below. A method has been considered in which the refrigerating machine oil 12 accumulated on the stator 19a is prevented from being blown up again by the refrigerant, and the refrigerating machine oil 12 is allowed to flow downward through the stator communication hole 19 from above.

However, this method has the disadvantage that the cross-sectional area of the stator communication hole 19 cannot be made sufficiently large because the efficiency of the motor 11 decreases.

Incidentally, a technique related to returning the refrigerating machine oil 12 from the motor upper space 20 to the motor lower space 18 is disclosed in Japanese Utility Model Application No. 59-7.
No. 6782 has been proposed. In this method, the refrigerant is guided directly into the motor upper space 20 through the shaft 5, so that the refrigerant hardly rises into the stator communication hole 19 from below. This is an excellent method as it allows the refrigerating machine oil 12 to flow down easily. However, in some cases, a refrigerant passage is provided in the shaft 5, which may result in restrictions in terms of strength or structure.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology has a problem that it cannot be said to be completely satisfactory in terms of motor efficiency, strength, and structure. For this reason, the present invention has a simple structure that allows the refrigerating machine oil lifted into the upper space of the motor to be easily returned to the lower space of the motor without causing any structural problems. The purpose is to provide a rotary compressor that can be secured in the future.

[Means for solving problems]

The above purpose is to provide a raised oil level prevention part around the upper opening of some of the stator communication holes, so that the oil accumulated on the upper surface of the stator in the upper space of the stator is re-fogged by the refrigerant from the stator communication holes. This can be achieved by preventing the refrigerating machine oil from being blown up into the motor, and by allowing the refrigerating machine oil accumulated on the upper surface of the stator to flow down into the space below the motor through the stator communication hole which is not provided with an oil-up prevention section.

[Effect]

A part of the mist-shaped refrigerating machine oil 12 lifted into the motor upper space 20 together with the refrigerant compressed in the compressor machine section 8 is
It is collected on the inner surface of the closed container 1 and the end coil portion of the stator 9 and accumulates on the upper surface of the stator 9. By raising the periphery of the opening of some of the stator communication holes and providing a part to prevent oil buildup, the refrigerating machine oil 12 accumulated on the upper surface of the stator 9 can be removed.
is prevented from becoming atomized again and floating in the motor head space 20. By doing so, the refrigerating machine oil 12 tends to accumulate on the upper surface of the stator, and the refrigerating machine oil 12 easily flows down into the motor lower space 18 from the remaining low stator communication holes around the openings where the oil level prevention part is not provided.

〔Example〕

Embodiments of the rotary compressor of the present invention will be described below with reference to FIGS. 1 to 16. Note that the same parts as in the conventional example are indicated by the same symbols as in the conventional example, and explanations of the structures of the same parts will be omitted.

Fig. 1 is a longitudinal sectional view, Fig. 2 is a sectional view taken along line 8-1 in Fig. 1,
Figure 3 is a partial diagram of Bi in Figure 1, Figure 4 is a partial diagram of Dl in Figure 3.
-D11 sectional view, and Figures 5 to 10 are other embodiments corresponding to Figures 5 and 4, respectively, Figure 11 is a partial view of section C in Figure 1, and Figure 12 is the same as in Figure 11. Tortoise-E, line sectional view, 1st
5 to 16 show other embodiments corresponding to FIGS. 11 and 12, respectively.

In the figure, reference numeral 23 is provided with an oil leak prevention part 24 at the upper opening, and a refrigerant is transferred from the motor lower space 18 to the motor upper space 2.
The stator communication hole 25 for the refrigerant, whose main purpose is to circulate the refrigerant to
This is an oil return stator communication hole intended to cause the refrigerating machine oil 12 accumulated on the upper surface of the stator 9 to flow down into the motor lower space 18.

In the above structure, the refrigerant is sucked in from the suction vibrator 17 and is rotated by the refrigerant part 11 of the compressor machine s8, which is made up of a piston 4, a cylinder 2, etc. fitted to a shaft 5.
The discharge valve from the cylinder 2, which is compressed and discharged into the space below the motor, is not shown. Then, it flows into the motor upper space 20 through the stator communication holes 23 and 25. When the refrigerant flows from the motor lower space 18 to the motor upper space 20, there may be sudden changes in temperature or pressure in various parts of the closed container 1, such as when starting the compressor 16 or when defrosting starts or ends in the heat pump cycle. When a change occurs and the refrigerating machine oil 12 bubbles, a so-called forming phenomenon occurs, the refrigerating machine oil 12 may be lifted into the motor upper space 20 together with the refrigerant. Refrigerating machine oil 1 lifted into the motor upper space 20 in this way
A part of the refrigerant 2 is discharged as is from the discharge pipe 21 together with the refrigerant, but the remaining part accumulates on the upper surface of the stator 9. The refrigerating machine oil 12 accumulated on the upper surface of the stator 9 can be removed from the stator communication hole 23 by providing the oil blow-up prevention part 24.
This reduces the possibility that the oil will be blown up again in the form of mist at the upper opening, and the motor lower space 1 is removed from the stator communication hole 25 for oil return.
8 and is supplied to various parts by the oil pool at the bottom of the closed container 1 and the ponyp bead 22.

As described above, by providing the oil blow-up prevention portions 24 in some of the stator communication holes 25, it is possible to always secure sufficient refrigerating machine oil 12 at the bottom of the closed container 1, thereby improving the reliability of the compressor. I can't let it happen.

In the above embodiment, a structure e was described in which the oil blow-up prevention part 24 is simply press-fitted as a separate part into the stator communication hole 25 formed between the stator 9 and the wall surface of the sealed container 1, but as shown in FIG. and the oil blow-up prevention part 2 as in the embodiment shown in FIG.
By providing a cut-out portion in 4 and using this as a positioning stopper 244, it is possible to mass-produce compressors 13 with less variation between products during mass production.

Furthermore, in the embodiment shown in FIGS. 5 and 6, the stator 9 is structurally fixed in the closed container 1 and then the oil blow-up prevention part 2
4 is attached by press-fitting, etc., so there are some disadvantages in terms of assembly processing. Figure 7 shows an example that improves this point.
It is shown in FIG. As shown in the figure, stator communication hole 2
6 between the stator 9 and the sealed container 10, but between the 2 stators 9
By providing the oil blow-up prevention portion 24 on the stator 9,
Since the stator 9 can be attached to the stator 9 alone before being fixed to the hermetic container 1, it is possible to further improve the assembling workability compared to the previous embodiment.

Examples for further improving processability are shown in FIGS. 9 and 10. In the figure, the uppermost surface of the stator 9 is made of a stator end plate 98 made of a steel material with good press workability, and an oil blow-up prevention part 24 is provided on this stator end plate 94 by press work or the like (this is how it is done). This eliminates the need to reinstall the oil blow-up prevention part 24 at the stage of fixing the stator 9 to the airtight container 1, thereby making it possible to further improve workability.

In the above embodiments, the oil blow-up prevention section 24 has been described, but the oil blow-up prevention section 2
An embodiment in which the stator communication hole 25 for oil return is improved will be described in conjunction with 4.

11 and 12 are partial views of section B in FIG. 1,
This is an oil return stator communication hole 25 that is not provided with an oil blow-up prevention part 24, and shows a state in which no particular improvement has been made to this part. In this embodiment, the oil blow-up prevention part 2
Although it is possible to prevent the refrigerant oil 12 accumulated on the upper surface of the stator 9 from being blown up by the refrigerant from the stator communication hole 23 provided with the stator 4, the refrigerant rising from the stator communication hole 25 for oil return may cause the refrigerant to flow in from the upper opening. A portion of the refrigerating machine oil 12 is atomized again and scattered into the motor upper space 20. Therefore, simply assuming that half of the stator communication holes 19 are provided with the oil blow-up prevention portions 23, the stator communication holes 23 for refrigerant are provided, and the remaining half are not provided with the oil blow-up prevention portions 24, and the stator for oil return is installed. When the communication hole 25 is used, fjk of the refrigerating machine oil 12 scattered at the upper opening can be improved to half that of the conventional example shown in FIG.

Therefore, an improved embodiment is shown in FIGS. 15 and 14 in order to reduce the amount of refrigerating machine oil 12 that is scattered again by the refrigerant at the upper opening of the stator communication hole 25 for oil return.

In the figure, reference numeral 26 denotes a resistor such as a wire mesh made of stainless copper or the like, porous foam metal, or sintered metal. By increasing the flow resistance at the lower part of the oil return stator communication hole 25 in this way, the flow rate of the refrigerant through the oil return stator communication hole 25 is reduced, the refrigerant velocity at the upper opening is reduced, and the upper surface of the stator 9 is reduced. Refrigerating machine oil accumulated in
Make sure that 2 flows down easily. In addition, as the resistance at the lower part is increased, the resistance when the refrigerating machine oil 12 flows down also increases.
2 flows down the resistance part due to the pressure caused by the weight of refrigeration oil 1.
2 flows out into the motor lower space 18.

By reducing the resistance at the bottom of the oil return stator communication hole 25 in this way, the resistance between the refrigerant rising from below to the top and the refrigerating machine oil 12 flowing down from the top to the bottom is changed.
The effect of returning the refrigerating machine oil 12 accumulated on the upper surface of the stator 9 to the motor lower space taK can be further increased.

Further, FIG. 15 shows another embodiment for providing this resistance.
It is shown in FIG. In the figure, reference numeral 27 denotes a lower end face plate of the stator in which the oil return stator communication hole 25 is covered with a resistor portion 29 having a small hole 28. It is advantageous to provide resistance to the stator communication holes 25 for oil return in such a stator lower end plate 27, and to provide resistance to each communication hole 25.
No need to insert 6.

It has good workability and can obtain the same effects as the above-mentioned embodiments.

〔Effect of the invention〕

As described above, the rotary compressor of the present invention has a simple structure and improves motor efficiency by easily returning more refrigerating machine oil lifted into the space above the motor to the space below the motor without causing any structural problems. This has the effect of ensuring sufficient refrigerating machine oil at the bottom of the airtight container 1.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the rotary compressor of the present invention, Fig. 2 is a sectional view taken along the line λ-1III in Fig. The figure is Figure 3 glue. FIG. 12 is a cross-sectional view taken along lines E and -B in FIG. 11,
The longitudinal cross-sectional view, FIG. 18, shows the cross-sectional view taken along line FF in FIG. 17. 1... Airtight container, 8... Compression machine section. ? ...Stator, 11. ··motor. 12...Refrigerating machine oil, 17...Suction vibe. 18...Motor lower space, 20...Motor upper space. 21...Discharge pipe, 25...Stator communication hole. 24...Oil build-up prevention part, 25...Stator communication hole. 26...Resistor, 29...Resistance section. (・ (゛mi; Representative Patent Attorney Katsuo Ogawa＼ Figure 1 Figure 2 Figure 3 Figure 3 Uyuan Figure 5 Figure 7 Masa Atsushi 8 Figure 9 Figure 10 Figure 4 also No I Figure 1 too 12
Figure 13 Ka 74 - Figure 15 Solid Figure 15 Box 77 No. 18

Claims (1)

[Claims] 1. A motor upper space communicating with a discharge pipe from the upper side, a motor, a motor lower space, and a compressor machine part having a refrigerating machine oil reservoir in the lower part and communicating with a suction pipe are successively installed in a sealed container, and the motor upper space is connected to a discharge pipe from above. 1. A rotary compressor having a stator communication hole that communicates a space with a motor lower space, wherein some of the stator communication holes are provided with an oil blow-up prevention part with a raised upper opening.