JP2000161275A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce outflow quantity of oil from a compressor by enabling an inside refrigerant passage and an outside refrigerant passage to allow the passing of a compressed refrigerant by opening on the both ends of the rotor shaft direction, and covering an opening of the inside refrigerant passage and an opening of the outside refrigerant passage with an oil separating plate. SOLUTION: A refrigerant compressed by a compression element incorporated inside a compressor rises inside a rotor 4a by passing through a refrigerant passage 10 and a magnetic flux separating groove. The refrigerant flows out of an opening of a refrigerant outflow port 15 and the refrigerant passage 10. At this time, since an oil separating plate 9 is installed so as to cover the opening of the refrigerant outflow port 15 and the refrigerant passage 10, both refrigerants passing through the refrigerant passage 10 and the magnetic flux separating groove strike on the oil separating plate 9 to separate the refrigerant and oil. Outflow quantity of oil to the compressor outside can be effectively reduced by improving an oil separating effect by the oil separating plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to a structure of a portion for separating oil contained in a compressed refrigerant from the refrigerant.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional rotary compressor 1. As shown in FIG. 4, the rotary compressor 1 includes a motor 4 and a compression element 3 incorporated in a closed casing 2.
Is provided. The motor 4 has a rotor 4a and a stator 4b. The power from the motor 4 rotates the crankshaft to compress the refrigerant in the compression element 3, and the compressed refrigerant is discharged into the primary space 6 from a discharge muffler 5 mounted on the compression element 3. .

The refrigerant discharged into the primary space 6 passes through the refrigerant passage 10 shown in FIG. 5 or the stator core cut portion 11 or the air gap portion 16 shown in FIG.
Move in. That is, the inside of the rotor 4a shown in FIG.
The compressed refrigerant rises inside the closed casing 2 along the outer circumference of the air gap portion 16 or the stator 4b, and moves into the secondary space 7. At this time, the refrigerant that has passed through the inside of the rotor 4a is removed by the oil separating plate 9 attached to one end of the rotor 4a.
In this case, the oil is separated from the refrigerant. afterwards,
The refrigerant is discharged to the outside of the compressor 1 through the discharge pipe 8.

[0004]

The refrigerating machine oil in the compressor 1 mixes with the refrigerant and rises from the primary space 6 to the secondary space 7, is separated in the secondary space 7, and a part of the primary space. 6, if the separation efficiency is poor and the amount returned to the primary space 6 is small, the amount of oil flowing out of the compressor 1 increases.

The following two methods can be used to reduce the amount of oil flowing out of the compressor 1 as described above. The first method is to reduce the pressure difference between the primary space 6 and the secondary space 7 so that the oil can be easily returned to the primary space 6. Second
By making oil droplets large when oil is separated from a mixed fluid of oil and refrigerant, oil is less likely to be caught in gas discharged from the discharge pipe 8 and is easily dropped into the primary space 6. Method.

In order to reduce the pressure difference between the primary space 6 and the secondary space 7, it is conceivable to enlarge the stator core cut portion 11. The rising flow rate of the refrigerant increases, and the flow rate of the refrigerant passing through the inside of the rotor 4a decreases. Therefore, the oil separation effect of the oil separation plate 9 cannot be fully utilized.

In order to increase the size of oil droplets in the above-mentioned second technique, it is necessary to increase the amount of refrigerant corresponding to the oil separating plate 9. However, there is a limit in increasing the passage area of the refrigerant passage 10, and as a result, it is difficult to improve the oil separation effect of the oil separation plate 9. At the same time, it has been difficult to reduce the pressure difference between the primary space 6 and the secondary space 7.

As described above, it is difficult for the conventional compressor 1 to reduce the amount of oil flowing out.

The present invention has been made to solve the above problems. An object of the present invention is to reduce the amount of oil flowing out of compressor 1.

[0010]

The rotary compressor according to the present invention comprises a motor (4), an inner refrigerant passage (10) and an outer refrigerant passage (12), and an oil separator (9). . The motor (4) includes a rotor (4a) and a stator (4b).
And The inner refrigerant passage (10) and the outer refrigerant passage (12) are opened at both axial ends of the rotor (4a) to allow the passage of the compressed refrigerant. The oil separation plate (9) is provided so as to cover the opening of the inner refrigerant passage (10) and the opening of the outer refrigerant passage (12).

By providing the inner refrigerant passage (10) and the outer refrigerant passage (12) in the rotor (4a), the flow rate of the refrigerant passing through the inside of the rotor (4a) can be increased. Thereby, while being able to reduce the differential pressure between the primary space and the secondary space in the casing,
Since more refrigerant can be applied to the oil separation plate (9), the oil separation effect of the oil separation plate (9) can also be improved.

In the rotary compressor according to the second aspect, the magnetic flux separation groove is used as the outer refrigerant passage (12).
The magnetic flux separation groove is provided in the rotor (4a) to separate the magnetic flux of the magnet incorporated in the rotor (4a).
Open at both ends in the axial direction of a).

By opening both ends of the magnetic flux separation groove to the primary space and the secondary space, the magnetic flux separation groove can be used as the outer refrigerant passage (12). At this time, it can be dealt with only by slightly changing the shape of the member closing both ends of the magnetic flux separation groove, so that there is almost no increase in cost.

In the rotary compressor according to the third aspect, the oil separating plate (9) is attached to one end of the rotor (4a) via the spacers (14a, 14b).
a, 14b) form an outer refrigerant passage (1) so as to form a passage for guiding the refrigerant having passed through the inner refrigerant passage (10) and the outer refrigerant passage (12) radially outward of the rotor (4a).
2) Installed on both sides.

By forming the passage by the spacers (14a, 14b) in this manner, the outer refrigerant passage (1) is formed.
2) It is possible to increase the flow velocity of the refrigerant in the radial direction of the rotor (4a) after passing through the rotor (4a).
It can be efficiently guided in the radially outward direction of a). Accordingly, the refrigerant that has passed through the inner refrigerant passage (10) can also be guided to the outside of the rotor (4a). As a result, the amount of the refrigerant falling on the oil separation plate (9) per unit time can be further increased, and the oil separation effect of the oil separation plate (9) can be further improved.

In the rotary compressor according to the fourth aspect, a plurality of inner refrigerant passages (10) are provided, and the spacer (14b) extends between adjacent inner refrigerant passages (10).

By extending the spacer (14b) between the inner refrigerant passages (10) in this manner, the rotor (4a) of the refrigerant having passed through the inner refrigerant passage (10) and the outer refrigerant passage (12) is formed. The flow velocity in the radial direction can be further increased, and the refrigerant can be more efficiently transferred to the rotor (4).
a) can be guided outward.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the rotary compressor in each embodiment is the same as the conventional rotary compressor 1 shown in FIG. 4 except for the internal structure of the rotor 4a and the mounting structure of the oil separation plate 9, so that each embodiment will be described. Description of the entire structure of the rotary compressor to be applied is omitted.

(Embodiment 1) FIG. 1 shows a structure of a rotor 4a according to Embodiment 1 as viewed from a primary space 6 side.
FIG. 2 shows the structure of the rotor 4a viewed from the secondary space 7 side and the mounting structure of the oil separation plate 9.

First, referring to FIG. 1, an end plate 13a is mounted on the end face of the rotor 4a on the primary space 6 side. The end plate 13a has a substantially square shape, and exposes at least a part of the magnetic flux separation groove (rotor barrier portion) 12 provided in the rotor 4a. This magnetic flux separation groove 12 is used for the rotor 4a.
At the outside refrigerant passage. The rotor 4a has
A refrigerant passage 10 is provided as in the conventional example, and this refrigerant passage 10 serves as an inner refrigerant passage in the present invention. In addition, as long as the rotor 4a is provided with two types of refrigerant passages, an inner refrigerant passage located relatively inside and an outer refrigerant passage located relatively outside, the embodiment shown in FIG. 1 is limited. Not done.

Next, referring to FIG. 2A, a circular end plate 13b is mounted on the end face of the rotor 4a on the secondary space 7 side. The end plate 13 b has a refrigerant outlet 15 for exposing the magnetic flux separation groove 12 and an opening for exposing the refrigerant passage 10. As shown in FIG. 2B, a spacer 14a is mounted on the end plate 13b. This spacer 14
a has a function of separating the oil separation plate 9 mounted thereon and the end plate 13b, and allows the refrigerant to flow through the rotor (4).
The road leading to the radially outward direction of a) is formed.

The refrigerant compressed by the compression element incorporated in the compressor rises inside the rotor 4a through the refrigerant passage 10 and the magnetic flux separation groove 12 shown in FIG. Then, the refrigerant flows out from the refrigerant outlet 15 and the opening of the refrigerant passage 10 shown in FIG. At this time, as shown in FIG. 2B, since the oil separating plate 9 is attached so as to cover the refrigerant outlet 15 and the opening of the refrigerant passage 10, the refrigerant passage 10
The refrigerant that has passed through the magnetic flux separation groove 12 and the magnetic flux separation groove 12 both hit the oil separation plate 9 and the refrigerant and the oil are separated.

As described above, since the refrigerant passes not only in the refrigerant passage 10 but also in the magnetic flux separation groove 12, the amount of the refrigerant passing through the inside of the rotor 4a can be increased as compared with the conventional example. Thereby, the amount of the refrigerant that hits the oil separation plate 9 can be increased, and the oil separation effect can be improved. In addition, the magnetic flux separation groove 12 is formed in the primary space 6.
And the primary space 6 by communicating with the secondary space 7.
The pressure difference between the secondary space 7 and the secondary space 7 can be reduced, and the oil in the secondary space can be easily returned to the primary space 6.

Further, as shown in FIG. 2A, by providing spacers 14a on both sides of the refrigerant outlet 15,
As described above, the magnetic flux separating grooves 12 are formed by the spacers 14a.
In addition, a passage for guiding the refrigerant after passing through the refrigerant passage 10 to the outside can be formed. By providing such a passage, the speed of the refrigerant flowing through the magnetic flux separation groove 12 in the radially outward direction of the rotor 4a can be increased, and the refrigerant after passing the refrigerant passage 10 also rotates. It can be guided radially outward of the child 4a. As a result, the amount of the refrigerant that hits the oil separation plate 9 per unit time can be further increased, and the oil separation effect can be further improved.

As described above, according to the rotary compressor according to the first embodiment, not only can the oil separating effect by the oil separating plate 9 be improved, but also the space between the primary space 6 and the secondary space 7 can be improved. Since the differential pressure can also be reduced, the oil sent together with the refrigerant into the secondary space 7 can be returned to the primary space 6 more. As a result, the amount of oil flowing out of the compressor (the amount of oil rising) can be reduced as compared with the conventional example. Specifically, while the oil rising rate of the conventional example was 2.1 wt%, according to the present embodiment, it was 1.1 wt%.
And could be reduced.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 (a)
FIG. 3B shows the structure of the rotor 4a according to the second embodiment viewed from the secondary space 7 side, and FIG. 3B shows the mounting structure of the oil separation plate 9 according to the second embodiment.

As shown in FIG. 3A, the second embodiment
In the embodiment, the spacer 14b extends to a position between the predetermined refrigerant passages 10. Thereby, the refrigerant flowing out of the refrigerant passage 10 can also be forcibly guided in the radially outward direction of the rotor 4a by the spacer 14b, and the refrigerant can be more efficiently transferred to the rotor 4a than in the case of the first embodiment. It can be guided radially outward. As a result, the oil separation effect of the oil separation plate 9 can be further enhanced, and the rise of oil can be more effectively suppressed. Specifically, the oil rising rate was reduced to 0.7 wt%.

In the embodiment shown in FIG.
4b, the opposing wall surfaces are substantially parallel, and the opposing wall surfaces are close to each other. As a result, the flow passage area of the refrigerant is reduced as shown in FIG.
And the flow rate of the refrigerant in the radial direction of the rotor 4a can be increased. This is also considered to contribute to efficient oil separation. Further, as shown in FIG. 3, the area of the side surface of the spacer 14b itself is larger than that shown in FIG. Thereby, the contact area between the refrigerant and the spacer 14b increases, which is also considered to contribute to the improvement of the oil separation effect.

In the second embodiment, as shown in FIG. 3 (a), opposing side walls of adjacent spacers 14b are substantially parallel to form a cross-shaped passage. The shape of the passage for guiding the refrigerant outward can be arbitrarily selected as long as it reaches the space between the passages 10.

As described above, the embodiments of the present invention have been described. However, it should be understood that the embodiments disclosed herein are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0031]

As described above, according to the present invention, the differential pressure between the primary space and the secondary space in the closed casing of the compressor can be reduced, and the oil separation plate ( The oil separation effect according to 9) can also be improved.
Thus, the amount of oil flowing out of the compressor can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a bottom view of a rotor as viewed from a primary space side in a casing of a compressor.

FIG. 2A is a plan view of a rotor viewed from a secondary space side in a casing of a compressor. (B) is a side view which shows the attachment structure of an oil separation plate.

FIG. 3A is a plan view of a rotor according to Embodiment 2 of the present invention as viewed from a secondary space side. (B) is a side view which shows the mounting structure of the oil separation plate in Embodiment 2 of this invention.

FIG. 4 is a sectional view showing an example of a conventional rotary compressor.

FIG. 5 is a bottom view of a rotor of a conventional rotary compressor as viewed from a primary space side.

FIG. 6 is a plan view showing a stator core cut portion in a conventional rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary compressor 2 Hermetic casing 3 Compression element 4 Motor 4a Rotor 4b Stator 5 Discharge muffler 6 Primary space 7 Secondary space 8 Discharge pipe 9 Oil separation plate 10 Refrigerant passage 11 Stator core cut part 12 Flux separation groove 13a , 13b End plate 14a, 14b Spacer 15 Refrigerant outlet

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F04C 29/00 F04C 29/00 T (72) Inventor Katsuzo Kato 3-12 Chikushinmachi, Sakai-shi, Osaka Daikin (72) Inventor Hiromichi Taniwa, Okamoto-cho, Kusatsu-shi, Shiga 1000-2, Otani, Daikin Industries, Ltd. Shiga Works F-term (reference) 3H003 AA05 AB04 AC03 BD05 BD12 BG09 BH07 CD01 CF04 3H029 AA04 AA13 AA21 AB03 BB05 BB35 BB43 CC07 CC09 CC23 CC27 CC33 CC42

Claims (4)

[Claims] 1. A motor (4) having a rotor (4a) and a stator (4b), and an inner refrigerant opening at both axial ends of the rotor (4a) and allowing the passage of compressed refrigerant. A passage (10) and an outer refrigerant passage (12); and an oil separation plate (9) provided to cover an opening of the inner refrigerant passage (10) and an opening of the outer refrigerant passage (12). , Rotary compressor. 2. The outer refrigerant passage (12) is provided in the rotor (4a) to separate a magnetic flux of a magnet incorporated in the rotor (4a), and axially opposite ends of the rotor (4a). The rotary compressor according to claim 1, further comprising a magnetic flux separation groove that opens into the rotary compressor. 3. The oil separating plate (9) includes a spacer (14).
a, 14b) attached to one end of the rotor (4a), and the spacers (14a, 14b) transfer the refrigerant passing through the inner refrigerant passage (10) and the outer refrigerant passage (12) to the rotor. 3. The rotary compressor according to claim 1, wherein the rotary compressor is installed on both sides of the outer refrigerant passage so as to form a passage leading radially outward of the rotor. 4. 4. The rotary compressor according to claim 3, wherein a plurality of said inner refrigerant passages (10) are provided, and said spacers (14b) extend between adjacent inner refrigerant passages (10).