JP2001234863A - Hermetic motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent decrease in performance of a refrigerating and air conditioning apparatus due to adhesion of lubricating oil to an interior of a heat exchanger by preventing the lubricating oil from reducing in a hermetic motor- driven compressor. SOLUTION: Balance weights 6 are provided at respective end faces of a substantially tubular type. A rotor cover 10, a substantially cup-like plate, is provided at an end of the balance weight on the side of the compressor, and an oil separator 7 in the form of a flat plate is provided at an end face of the balance weight opposite the compressor. The balance weights 6, the oil separator 7 and the rotor cover 10 are fixed to a rotor 2 by rivet pins 9 or the like. The oil separator 7 and the rotor cover 10 are configured to be in contact with the respective balance weights with their central angles being at least in a range exceeding 180 degrees or preferably, 270 degrees relative to the rotation of the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic electric compressor used for an air conditioner, a refrigerator and the like.

[0002]

2. Description of the Related Art A hermetic electric compressor has a structure in which a compression section and a motor section are hermetically closed by a closed container. Gas is sucked from a suction port provided on a side surface of the closed container and then compressed by a compression section. Is done. This compressed gas is discharged from the compression section discharge port into the closed container.

[0003] The compression unit is driven by a motor connected via a drive shaft. The motor is composed of a stator and a rotor, and the compressed gas discharged from the discharge port of the compressor passes through a gas passage provided in the outer periphery of the stator or a gap between the stator and the rotor, and is provided on the side of the sealed container. Discharged from the discharge port.

Further, the compression portion has a sliding contact portion due to its structure, and lubricating oil is required to lubricate the sliding contact portion. Therefore, an oil passage is formed in the inner or outer peripheral portion of the drive shaft, one of which faces lubricating oil provided on the inner bottom portion of the sealed container and the other is opened to an end face side different from the compression portion of the rotor. Lubricating oil is supplied to a sliding contact portion of the compression section through an oil passage.

[0005] However, the lubricating oil that lubricates the sliding portion of the compression section is mixed with the compressed gas in the compression section, and is discharged together with the compressed gas from the compressor discharge port to the outside of the compressor. Further, since the oil passage is opened at an end face side different from the compressor of the rotor, lubricating oil is discharged from an opening of the oil passage provided on the drive shaft, and this oil is mixed with the compressed gas and discharged from the compressor. It is discharged from the outlet to the outside of the compressor.

In order to prevent such lubricating oil from being discharged to the outside of the compressor, an oil separator is disposed facing the rotor end face on the open port side of the oil passage at a predetermined interval and discharged from the open port. This prevents the lubricating oil from directly reaching the outside of the compressor.

When the rotor is a permanent magnet type rotor using a rivet pin or the like, the oil separator is, for example, disclosed in Japanese Patent Application Laid-Open No. Hei 5-227687. A spacing means such as a spacer is provided and fixed between the oil separator and the oil separator to keep a constant spacing.

[0008]

In the above configuration,
As shown in FIG. 5, the lubricating oil discharged to the opening of the oil passage through the oil passage provided on the drive shaft is not taken out of the compressor from the compressor discharge outlet by providing the oil separator. Although it can be reduced, the lubricating oil supplied to the compression unit through the oil passage provided in the drive shaft is mixed with the compressed gas compressed in the compression unit, and the refrigerant passage in the outer peripheral portion of the stator and the gap between the stator and the rotor. Therefore, the amount of the lubricating oil inside the compressor is gradually reduced, and the lubrication of the compression section is deteriorated. In addition, heat exchangers are provided in refrigeration and air conditioning equipment, but if lubricating oil adheres to the inside of this heat exchanger, the heat exchange efficiency will decrease, and the performance of refrigeration and air conditioning equipment will also decrease. It will be.

Further, according to the method described in Japanese Patent Laid-Open No. Hei 5-227687, an extra space holding means such as a specially processed rivet pin or spacer is required for mounting the oil separator. ,Productivity,
There was a problem in terms of cost and the like. The present invention solves these problems.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a structure in which a mechanism for separating lubricating oil from a mixture of lubricating oil and compressed gas is provided on a rotor of a motor unit. The lubricating oil compressed gas mixture discharged from the compression section into the compressor has a mechanism for passing through the rotor.

The rotor is provided with a substantially cup-shaped rotor cover having a bottom on the compression part side and an opening on the rotor side on the end face on the compression part side, and a predetermined distance from the rotor end face on the non-compression part side rotor end face. Provide a flat oil separator,
Holes or grooves are provided through the entire length of the rotor.

Further, the rotor cover and the oil separator are in contact with end faces of balance weights provided on both end faces of the rotor, and the balance weight, the rotor cover and the oil separator are fixed to the rotor by rivet pins or the like. The cover and the oil separator should be at least 18
It is in contact with the balance weight in the range exceeding 0 degrees.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present application is directed to a closed container having a suction port for sucking a gas, a compressor discharge port for discharging a compressed gas, and a lubricating oil reservoir provided at a bottom portion. A compression unit configured to compress gas sucked from the suction port and discharge the compressed gas into the closed container; and a motor unit including a substantially cylindrical rotor having a drive shaft connected to the compression unit. Is a hermetic electric compressor which is housed in the hermetically sealed container so as to be on the opposite side to the lubricating oil reservoir with respect to the motor portion, wherein the lubricating oil reservoir communicates with the compressing portion to compress the lubricating oil. A lubricating oil passage, a guide plate for guiding a lubricating oil compressed gas mixture discharged from a compression unit discharge port to a compression unit side rotor end surface of a motor unit, and a lubricating oil passage mounted on the compression unit side rotor end surface. Drive shaft with predetermined clearance A substantially cup-shaped rotor cover having a hole therethrough, a lubricating oil-compressed gas mixture passage communicating the end portion of the compressor side and the end surface of the counter-compression portion, and a predetermined distance from the end face of the counter-compression portion. A plate-like oil separator that is provided and separated into lubricating oil and compressed gas by collision of the lubricating oil compressed gas mixture,
A compressed gas passage for guiding the separated compressed gas to a compressor discharge port provided in a closed container, and a guide plate and a substantially cup-shaped rotor cover ensure that the lubricating oil compressed gas mixture is formed inside the rotor. And has an effect that the compressed gas and the lubricating oil can be separated by the oil separator provided on the end face of the rotor on the side opposite to the compression section.

According to a second aspect of the present invention, there is provided the hermetic electric compressor according to the first aspect, wherein the compression section is disposed above the motor section and the lubricating oil sump is disposed below the motor section. The lubricating oil compressed gas mixture can be separated more reliably and easily.

According to a third aspect of the present invention, there is provided the hermetic electric compressor according to the first or second aspect, wherein the rotor has balance weights on both end faces, and the rotor cover and the oil separator are arranged with respect to the center of rotation of the rotor. The balance weight is fixed so as to be in contact with the end face of the balance weight in a range exceeding 180 degrees, so that the rotor cover and the oil separator can be easily and reliably attached to the rotor.

According to a fourth aspect of the present invention, there is provided the hermetic electric compressor according to the third aspect, wherein the balance weight provided on the rotor end face on the compression section side instead of the substantially cup-shaped rotor cover is substantially circular. A disk-shaped rotor cover is fixed so as to be in contact with the entire circumference of the end face of the balance weight as a ring shape.The rotor cover can be composed of balance weights and side plates, and is relatively inexpensive. It can be configured.

According to a fifth aspect of the present invention, the balance weight is divided symmetrically in the left and right direction, and has an effect of improving material removal.

(Embodiment 1) FIG. 1 is a sectional view of a hermetic electric compressor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the rotor of the motor unit of the hermetic electric compressor in one embodiment of the present invention.

The compressor is hermetically sealed by the hermetic container 15, and a compression section 18 is provided above the hermetic container 15.
The compression section 18 is driven by the rotor 2 of the motor section connected by the drive shaft 11. The drive shaft 11 passes through the rotor 2 and faces a lubricating oil reservoir 16 at the inner bottom of the sealed container 15. An oil passage 12 penetrating from the compression section 18 to the lubricating oil reservoir 16 is provided inside the drive shaft 11. ing.

A suction port 25 is provided on a side surface of the closed container 15, and the suction port 25 is connected to the compression section 18. The compression section 18 has a compression section discharge port 19 facing the inside of the closed container. Further, a guide plate 13 is provided between the compression section 18 and the stator 1 so that the lubricating oil compressed gas mixture discharged from the compression section discharge port 19 reaches the rotor 2.

The rotor 2 is rotatably opposed to the inner diameter of the substantially cylindrical stator 1 and has a permanent magnet 4 embedded inside a rotor core 3 formed by laminating stamped electromagnetic steel sheets. End plates 5 are arranged at both ends of the rotor core,
A balance weight 6 is provided, and a cup-shaped rotor cover 10 having a bottom on the compression part side and an opening on the rotor side is provided on an end face of the balance weight 6A on the compression part 18 side, and extends from the compression part 18 to the rotor cover. A hole through which the drive shaft 11 passes is provided. The oil separator 7 is provided on the end face of the balance weight 6B provided on the side opposite to the compression section 18. The bottom inside the rotor cover 10 and the balance weight 6A are in contact with each other over a range of more than 270 degrees in the central angle with respect to the rotor rotation center. Similarly, the oil separator 7 and the balance weight 6B are in contact with each other over a range exceeding 270 degrees in the central angle with respect to the rotor rotation center. The balance weight 6 may be thick in the radial direction of the rotor at the portion where the unbalanced load is provided, and may be sufficiently thin in the radial direction at other portions in consideration of the strength and the position of the rivet pin hole 8. Although the illustrated balance weight 6 is integrally formed by die casting or the like, in consideration of cost and productivity,
A structure in which thin plates are stacked or a shape which is equally symmetrical as shown in FIG. 3 may be used. It is possible to provide four rivet pin holes 8 at approximately 90 degree intervals in the balance weight 6, and the same rivet is provided at a position penetrating the rotor core 3, the end plate 5, the rotor cover 10, and the oil separator 7. A pin hole 8 is provided and can be fixed through the rivet pin 9. According to this configuration, it is not necessary to perform special processing on the rivet pin or to provide a special part for fixing the oil separator in a portion where there is no balance weight, thereby improving productivity.

When the diameter of the rotor core is Dr and the diameter of the oil separator is Do, Dr> Do, and the rotor core 3, the end plate 5, and the balance weight 6 penetrate through the entire length of the rotor in the range of the diameter Do. It has a lubricating oil compressed gas mixture passage 20.

In this construction, the gas to be compressed enters through a suction port 25 provided on the side surface of the sealed container 15 and is compressed by the compression section 18 to become a compressed gas, and the compressed section discharge port 19
It is more discharged into the closed container 15. The compressed gas released into the closed container is guided by the guide plate 13 to the rotor 2.
Sent to

The compression portion 18 has a sliding contact portion, and lubricating oil is required for lubricating the sliding contact portion. The lubricating oil is supplied to a lubricating oil reservoir 16 at the bottom of the closed container 15.
The oil is supplied to the sliding portion of the compression section 18 through the oil passage 12 inside the drive shaft 11. As described above, a part of the lubricating oil is mixed with the compressed gas when the gas is compressed in the compression section 18.

The lubricating oil compressed gas mixture is sent to the rotor 2 by the above-mentioned guide plate 13, and the mixture enters the inside of the rotor 2 through a gap between the rotor cover 10 and the drive shaft 11. 2, and collides with the oil separator 7 through the lubricating oil compressed gas mixture passage 20. At this moment, the lubricating oil compressed gas mixture is separated into the compressed gas and the lubricating oil, and the lubricating oil returns to the lubricating oil reservoir from the gap between the oil separator 7 and the drive shaft 11, or the lubricating oil is mixed with the balance weight 6 by the centrifugal force of the rotor rotation. The oil separator 7 is once thrown away from the gap in the rotor radial direction, hits the coil end 21 of the stator 1, and is dropped on the lubricating oil reservoir 16.

The separated compressed gas passes through the compressed gas passage 22 at the outer periphery of the stator 1 and rises again inside the compressor. It is discharged from the outlet 14 to the outside of the compressor.

In the above operation, the mixture of the compressed gas and the lubricating oil discharged from the discharge port of the compression section surely passes through the rotor having the separation mechanism by the guide plate. The amount of lubricating oil to be used can be greatly reduced, the lubricating oil inside the compressor does not decrease, and the lubrication of the compression section does not deteriorate. Further, by making the rotor cover have a substantially cylindrical shape, it is possible to surely allow the mixed gas to enter the interior of the rotor to pass through the interior of the rotor without being disturbed by centrifugal force generated when the rotor rotates.

(Embodiment 2) FIG. 3 is an exploded perspective view of a rotor of a motor unit of a hermetic electric compressor according to another embodiment of the present invention.

The rotor 2 has substantially the same structure as that of the first embodiment, but the rotor cover is provided with a balance weight 6C.
And the side plate 23.

The end face of the balance weight 6C has a central angle of 360 degrees with respect to the center of rotation of the rotor, that is, is in contact with the side plate 23 over the entire circumference.

Thus, the rotor can be composed of relatively simple parts compared to the rotor cover described above.

It is preferable that the end plate, the balance weight, and the side plate are punched and laminated with a thin plate made of the same material as the rotor core while switching the blades in the same press, and the process is extremely simplified, which is preferable.

The other configuration and operation are the same as those of the first embodiment, and will not be described.

In the first and second embodiments, the permanent magnet embedded motor in which the permanent magnet is embedded inside the rotor core is used. However, the present invention can be applied to a surface magnet type motor, an induction motor, a reluctance motor and the like. . In the case of a motor having an aluminum bar, such as an induction motor, the balance weight may be formed integrally with the end ring by aluminum die casting.

[0036]

As is apparent from the above description, claim 1
According to the invention described above, the lubrication mixed with the compressed gas by the oil separator provided on the rotor end face different from the compression part side ensures that the compressed gas passes through the hole or the groove inside the rotor by the substantially cylindrical rotor cover. Oil can be separated.

According to the second aspect of the present invention, the compression section is located above, has a structure in which the discharged compressed gas passes through the rotor section, and the rotor separates the lubricating oil mixed with the compressed gas. The lubricating oil that has been mixed can be easily separated because of having a mechanism that performs the mixing.

According to the third aspect of the present invention, the rotor cover and the oil separator can be easily and securely attached to the rotor.

According to the fourth aspect of the present invention, the rotor cover according to the third aspect can be constituted by the balance weight and the side plate, and can be relatively inexpensively equivalent in construction to the rotor cover.

According to the fifth aspect of the present invention, by dividing the balance weight, material removal is improved and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hermetic electric compressor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a rotor of a motor unit of a hermetic electric compressor according to an embodiment of the present invention.

FIG. 3 is a perspective view of a balance weight of the hermetic electric compressor according to the embodiment of the present invention.

FIG. 4 is an exploded perspective view of a rotor of a sealed electric compressor motor section according to another embodiment of the present invention.

FIG. 5 is a sectional view of a conventional hermetic electric compressor.

[Description of Signs] 1 Stator 2 Rotor 3 Rotor core 4 Permanent magnet 5 End plate 6 Balance weight 7 Oil separator 8 Rivet pin hole 9 Rivet pin 10 Rotor cover 11 Drive shaft 12 Oil passage 13 Guide plate 14 Compressor discharge port 15 Seal Container 16 Lubricant oil reservoir 17 Drive shaft hole 18 Compressor 19 Compressor discharge outlet 20 Lubricant compressed gas mixture passage 21 Coil end 22 Compressed gas passage 23 Side plate 25 Suction port

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Morimoto 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiromasa Ashiya 1006 Odaka Kazama Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. 72) Inventor Hiroyuki Kono 1006 Kazuma, Kazuma, Osaka Prefecture F-term (reference) in Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] A sealed container having a suction port for sucking a gas, a compressor discharge port for discharging a compressed gas, and a lubricating oil reservoir provided at a bottom portion; and a compressor for compressing the gas sucked from the suction port. And a motor section having a substantially cylindrical rotor having a drive shaft connected to the compression section, wherein the compression section is opposite to the lubricating oil reservoir with respect to the motor section. A hermetic electric compressor housed in the hermetic container so that the lubricating oil reservoir communicates with the compression section to suck lubricating oil into the compression section, and a compression section discharge port. It has a guide plate for guiding the discharged lubricating oil compressed gas mixture to the end face of the rotor on the compression part side of the motor part, and a hole mounted so as to cover the end face of the rotor on the compression part side and through which a drive shaft passes with a predetermined gap. A roughly cup-shaped low Cover, a lubricating oil compressed gas mixture passage communicating the end of the compressor side rotor and the end of the anti-compression part rotor, and the lubricating oil compressed gas provided at a predetermined distance from the end of the anti-compression part rotor. It has a flat oil separator that separates the lubricating oil and compressed gas by the collision of the mixture, and a compressed gas passage that guides the separated compressed gas to a compressor discharge port provided in a closed container. Hermetic electric compressor. 2. The hermetic electric compressor according to claim 1, wherein the compression section is disposed above the motor section and the lubricating oil sump is disposed below the motor section. . 3. The hermetic electric compressor according to claim 1, wherein the rotor has balance weights on both end faces, and the rotor cover and the oil separator are in a range exceeding 180 degrees with respect to the rotor rotation center. A hermetic electric compressor fixed to be in contact with an end face of the balance weight. 4. The hermetic electric compressor according to claim 3, wherein the balance weight provided on the end face of the rotor on the compression section side has a substantially annular shape instead of the substantially cup-shaped rotor cover. A hermetic electric compressor in which a disk-shaped rotor cover is fixed so as to be in contact with the entire end face. 5. The hermetic electric compressor according to claim 3, wherein the balance weight is divided symmetrically.