JP2008088930A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor, which is more reduced in size and weight with a simple mechanism. <P>SOLUTION: The compressor is provided with a rotary shaft 12 extending in a body 3 of a hermetic vessel 2 and rotatably supported via bearings 16, 28, a motor 6 driving the rotary shaft by electricity supply and including a rotor 7 and a stator 8, a compression mechanism 30 stored in an upper side of the motor, and a frame member 14 arranged between the compression mechanism and the motor to fix the compression mechanism and supporting the rotary shaft via the bearings. The frame member includes a flow direction change means 80 including a seal member 82 changing a direction of lubricating oil supplied to the bearing from an oil storage chamber 23 flowing down from the compression mechanism side to the motor side and cutting off the flowing-down lubricating oil to avoid the same from flowing into the rotor, and a discharge path 84 formed on an upper position of the seal member and orienting the flowing-down lubricating oil toward the stator. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hermetic compressor, and more particularly to a hermetic compressor that stores lubricating oil below a hermetic container.

This type of compressor is used in a refrigeration air conditioner or the like, and compresses a refrigerant as a working fluid. This refrigerant usually contains lubricating oil. This lubricating oil not only lubricates the sliding surfaces and bearings in the compressor, but also functions as a seal for the sliding surfaces.
However, if this lubricating oil is not supplied to the sliding surface or the like, the compressor will be damaged. Then, the compressor which aims at solution of the problem resulting from exhaustion of lubricating oil is known (for example, refer to patent documents 1).
Japanese Patent Laid-Open No. 10-47269

By the way, in the prior art mentioned above, the pipe which bypasses an electric motor and connects a compression mechanism and an oil storage chamber is provided, and this pipe is arrange | positioned at the outer peripheral side of the electric motor.
Here, when trying to solve the problem caused by the depletion of the lubricating oil, it should be noted that the size of the compressor is avoided. This is because, in compressors that are used in the above-described refrigeration and air-conditioning equipment and the like and store the lubricating oil below the hermetic container, in recent years, there has been a demand for further reduction in size and weight in order to easily arrange it in ordinary households. Because.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a hermetic compressor that further reduces the size and weight of the compressor with a simple mechanism.

  In order to achieve the above object, a hermetic compressor according to claim 1 includes a cylindrical body, a discharge chamber formed above the body, and a lubricating oil formed below the body. A sealed container having an oil storage chamber in which discharge pressure acts in the body, a rotating shaft extending through the body and supported rotatably via a bearing, and housed in the body, and driving the rotating shaft by energization And an electric motor having a rotor that rotates integrally with the rotating shaft around the rotating shaft, and a stator that includes an armature winding that rotates the rotor around the rotor, and is housed in the body on the upper side of the electric motor. A compression mechanism that is driven by a rotating shaft to perform a series of processes of suction, compression, and discharge of the working fluid, and is disposed between the compression mechanism and the motor, and fixes the compression mechanism and rotates through a bearing. A frame member supporting the shaft, and a frame The material has a flow direction changing means for changing the direction in which the lubricating oil provided to the bearing from the oil storage chamber flows down from the compression mechanism side to the electric motor side, and the flow direction changing means avoids inflow to the rotor, It includes a seal member for blocking the lubricant flowing down, and a discharge passage formed at a position above the seal member and directing the lubricant flowing down to the stator.

Further, in the invention according to claim 2, the flow direction changing means further includes a connection member that connects the discharge passage and the oil storage chamber, and prevents the lubricating oil flowing down from flowing into the rotor. The invention according to claim 3 is characterized in that the connecting member is passed through the gap of the armature winding.
Furthermore, the invention according to claim 4 is characterized in that the working fluid is a refrigerant made of carbon dioxide.

  Therefore, according to the hermetic compressor according to the first aspect of the present invention, the lubricating oil in the oil storage chamber is supplied to the bearing and functions as lubrication and cooling. However, the frame member has the lubricating oil from the compression mechanism side. It has a flow direction changing means for changing the flow direction to the electric motor side, and this direction change means is formed at a position above the seal member for blocking the lubricating oil flowing down, and for the lubricating oil flowing down. It has a discharge path directed to the stator, and avoids flowing lubricating oil into the rotor. Therefore, all of this lubricating oil is guided and stored in the oil storage chamber via the stator without being stirred by the rotor. As a result, it is possible to reliably prevent a failure of the compressor due to insufficient supply of lubricating oil, and contribute to improving the reliability of the compressor.

In addition, the rate of lubricating oil (OCR) flowing out of the compressor can be suppressed with a simple mechanism, the compressor can be further reduced in size and weight, and the manufacturing cost of the compressor can be reduced. .
In addition, the suppression of the lubricating oil ratio improves the efficiency of each heat exchanger of the refrigeration system, contributing to energy saving of the refrigeration system.
Further, according to the second and third aspects of the present invention, since the lubricating oil flowing down is directly discharged from the discharge path to the oil storage chamber through the connecting member, there is a risk that the compressor may be damaged due to insufficient supply of the lubricating oil. It is prevented more reliably.

  Furthermore, according to the invention described in claim 4, even when the refrigerant made of carbon dioxide compressed to high pressure is used as the working fluid and the plate thickness of the sealed container is increased, the above configuration is sufficient. An amount of lubricating oil can be secured.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a hermetic compressor according to the present embodiment. The compressor 1 is incorporated in a refrigeration circuit such as a refrigeration air conditioner or a heat pump type hot water heater. The circuit includes a path through which a CO ₂ refrigerant (hereinafter referred to as a refrigerant) that is an example of a working fluid circulates, and the compressor 1 sucks the refrigerant from the path, compresses the refrigerant, and delivers the refrigerant toward the path.

The compressor 1 includes a housing (sealed container) 2, and the body 3 of the housing 2 is airtightly fitted on the upper and lower sides by an upper lid 4 and a lower lid 5, respectively. Is sealed and discharge pressure is acting.
An electric motor (electric motor) 6 is accommodated in the body 3, and a rotating shaft 12 is disposed in the motor 6. Specifically, in the motor 6, a rotor 7 having a permanent magnet is fixed to the outer peripheral side of the rotating shaft 12, and a stator 8 having an armature winding 9 is disposed on the outer peripheral side of the rotor 7. A part of the outer peripheral side of the stator 8 is press-fitted and fixed to the body 3. When the armature winding 9 is energized, the rotor 7 rotates with the rotation of the magnetic field generated in the armature winding 9 and rotates integrally with the rotating shaft 12. Further, the upper end side of the rotary shaft 12 is rotatably supported by a main shaft frame (frame member) 14 via a bearing 16.

  On the other hand, the lower end side of the rotating shaft 12 is rotatably supported by the countershaft frame 18 via the bearing 20. An oil pump 22 is attached to the lower end side of the rotary shaft 12, and the pump 22 sucks lubricating oil in an oil storage chamber 23 formed inside the lower lid 5. This lubricating oil is supplied to the motor 6 and the scroll unit (compression mechanism) 30 from the upper end of the rotating shaft 12 through the oil passage 24 of the rotating shaft 12, and lubricates each sliding portion and bearing, and the sliding surface. Acts as a seal. Further, an inlet 19 for lubricating oil is formed at an appropriate position of the frame 18, and the lubricating oil supplied to each sliding portion in the compressor 1 is stored in the oil storage chamber via the inlet 19 as will be described later. 23 is stored.

  The unit 30 is disposed above the motor 6 in the body 3, and performs a series of processes of refrigerant suction, compression, and discharge. More specifically, the unit 30 includes a movable spiral body 52 and a fixed spiral body 32, and the movable spiral body 52 includes an end plate 54, and the end plate 54 extends toward the end plate 34 of the fixed spiral body 32. A spiral wrap is integrally formed. On the other hand, a spiral wrap extending toward the end plate 54 is also integrally formed on the end plate 34 of the fixed spiral body 32. These spiral wraps cooperate with each other to form a compression chamber, and the compression chamber moves from the radially outer peripheral side of the spiral wrap toward the center by the swirling motion of the movable spiral body 52 with respect to the fixed spiral body 32. In this case, the volume is reduced.

In order to impart a swiveling motion to the movable spiral body 52 described above, a boss 66 is formed on the lower surface side of the end plate 54, and this boss 66 is rotatably supported by the eccentric shaft 26 via a bearing 28. The eccentric shaft 26 is integrally formed on the upper end side of the rotary shaft 12. The rotation of the movable spiral body 52 is blocked by a rotation blocking pin 68.
On the other hand, the fixed spiral body 32 is fixed to the spindle frame 14, and the end plate 34 partitions the compression chamber side and the discharge chamber 60 side. A discharge hole communicating with the compression chamber side is formed at an appropriate position in the central portion of the fixed spiral body 32 through the end plate 34, and this discharge hole is disposed on the anti-scroll side of the fixed spiral body 32. The discharge valve 62 is opened and closed. Further, the anti-scroll side of the fixed spiral body 32 including the discharge valve 62 is covered with a discharge head 64, and the sound when the discharge valve 62 is opened is suppressed by the discharge head 64.

  By the way, the lubricating oil in the oil storage chamber 23 is provided to the bearings 16, 28, etc. via the oil pump 22 and the oil passage 24, but the spindle frame 14 of this embodiment has the lubricating oil flow direction changing means 80. The lubricating oil supplied to the unit 30 and the bearings 16, 28, etc. flows down from the unit 30 side to the motor 6 side, and its flow direction is changed and returned toward the oil storage chamber 23.

  Specifically, as shown in FIG. 2, the lower end of the spindle frame 14 is formed to be substantially equal to the width of the rotor 7, and is slightly larger than the width of the balance weight 10 disposed at an appropriate position of the rotor 7. have. An oil seal (seal member) 82 and an oil discharge path (discharge path) 84 are arranged as flow direction changing means 80 at the lower end of the spindle frame 14.

More specifically, the oil seal 82 is formed in an annular shape and is fitted to the lower end portion of the main spindle frame 14 so as to surround the rotary shaft 12, so that the lubricating oil flowing down from the bearing 16 toward the motor 6 is The flow is interrupted and the flow into the rotor 7 is prevented.
The oil discharge passage 84 is formed in the spindle frame 14 at a position above the oil seal 82 and is formed along the width direction of the rotor 7. As a result, the lubricating oil blocked by the oil seal 82 goes to the stator 8 and is prevented from flowing into the rotor 7.

According to the compressor 1 described above, as the rotary shaft 12 rotates, the movable spiral body 52 rotates without rotating. The swiveling motion of the movable spiral body 52 causes the refrigerant taken into the body 3 through the suction pipe 70 to be sucked from the outer peripheral side of the scroll unit 30 toward the inside thereof.
When the volume of the compression chamber is reduced, the high-pressure compressed refrigerant reaches the discharge chamber 60, circulates in the housing 2, and is sent out of the compressor through the discharge pipe 72.

On the other hand, the flow of the lubricating oil supplied to the unit 30 and the bearings 16, 28, etc. is changed in a substantially orthogonal direction by the oil seal 82 and the oil discharge passage 84, and the inside of the stator 8, for example, the armature winding 9 is changed. The oil flows down through the gap and is guided and stored in the oil storage chamber 23 through the inlet 19.
Next, FIG. 3 shows a second embodiment. The second embodiment has the same configuration as the above embodiment except for the configuration of the lubricating oil flow direction changing means. Therefore, this flow direction changing means will be mainly described.

The flow direction changing means 80A of the present embodiment includes an oil discharge path 84 and an oil storage chamber 23 in addition to an oil seal (seal member) 82 and an oil discharge path (discharge path) 84 disposed at the lower end of the spindle frame 14. An oil discharge tube (connecting member) 86 that is directly connected is further provided.
More specifically, one end of the oil discharge tube 86 is connected to the opening of the oil discharge passage 84. Subsequently, the tube 86 is bent and directed downward, and is passed through the gap in the armature winding 9 to be introduced. Mouth 19 is reached. The opening 88 at the other end of the tube 86 is disposed in the oil storage chamber 23, and the lubricating oil supplied to the unit 30, the bearings 16, 28, and the like flows through the oil seal 82 and the oil discharge path 84. Further, the flow is changed downward by the tube 86 again, flows down through the gap in the stator 8, and is guided to the oil storage chamber 23 through the inlet 19 and stored.

As described above, according to each embodiment, the lubricating oil in the oil storage chamber 23 is supplied to the sliding portion of the unit 30 and the bearings 16 and 28 via the oil pump 22 and the oil passage 24, and the lubrication and cooling are performed. In addition, although functioning as a seal for the sliding surface, the spindle frame 14 has flow direction changing means 80 and 80A for changing the direction in which this lubricating oil flows down from the unit 30 side to the motor 6 side.
First, the direction changing means 80 is provided with an oil seal 82 that blocks the flowing down lubricating oil, and the lubricating oil that is formed at a position above the oil seal 82 and that has a length exceeding the width of the rotor 7 and flows down. An oil discharge path 84 directed to the stator 8 is provided to prevent the lubricant flowing down from flowing into the rotor 7. That is, all of this lubricating oil is stored in the oil storage chamber 23 via the stator 8 without being stirred by the balance weight 10 of the rotor 7. As a result, the failure of the compressor due to insufficient supply of lubricating oil, for example, problems such as sliding parts and bearing seizure due to exhaustion of the lubricating oil can be reliably prevented, contributing to improved reliability of the compressor.

In addition, mist-like oil that accompanies agitation does not flow out of the compressor together with the refrigerant, and the rate of lubricating oil (OCR) that flows out of the compressor can be suppressed with a simple mechanism. The weight can be reduced and the manufacturing cost of the compressor can be reduced.
In addition, the suppression of the lubricating oil ratio improves the efficiency of each heat exchanger of the refrigeration system, contributing to energy saving of the refrigeration system.

Furthermore, according to the direction changing means 80A, since the lubricating oil flowing down is directly discharged from the oil discharge passage 84 to the oil storage chamber 23 through the oil discharge tube 86, there is a possibility that the compressor may be damaged due to insufficient supply of the lubricating oil. It is prevented more reliably.
The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, although the scroll unit is used in the above embodiment, other compression mechanisms may be used as long as a series of refrigerant suction, compression, and discharge processes are performed.

1 is a longitudinal sectional view showing a hermetic compressor according to an embodiment of the present invention. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view of the hermetic type compressor concerning other examples.

Explanation of symbols

1 Hermetic compressor 2 Housing (sealed container)
3 Body 6 Electric motor (electric motor)
7 Rotor 8 Stator 9 Armature winding 12 Rotating shaft 14 Spindle frame (frame member)
16 Bearing 23 Oil storage chamber 28 Bearing 30 Scroll unit (compression mechanism)
60 Discharge chamber 80, 80A Flow direction changing means 82 Oil seal (seal member)
84 Oil discharge path (discharge path)
86 Oil drain tube (connecting member)

Claims (4)

A sealed container having a cylindrical body, a discharge chamber formed above the body, and a lubricating oil storage chamber formed below the body, and a discharge pressure acts in the body When,
A rotating shaft extending through the body and rotatably supported through a bearing;
A rotor that is housed in the body, drives the rotating shaft by energization, and rotates integrally with the rotating shaft around the rotating shaft, and an armature winding that rotates the rotor around the rotor An electric motor having a stator including a wire;
A compression mechanism that is housed in the barrel on the upper side of the electric motor and driven by the rotating shaft to perform a series of processes of suction, compression, and discharge of working fluid;
A frame member disposed between the compression mechanism and the electric motor to fix the compression mechanism and to support the rotating shaft via the bearing;
The frame member has flow direction changing means for changing a direction in which lubricating oil provided to the bearing from the oil storage chamber flows down from the compression mechanism side to the electric motor side,
The flow direction changing means is formed at a position above the seal member for blocking the lubricant flowing down in order to avoid inflow into the rotor, and a discharge for directing the lubricant flowing down to the stator. A hermetic compressor including a road.   The said flow direction change means connects the said discharge path and the said oil storage chamber, and further contains the connection member which avoids that the lubricating oil which flows down flows in into the said rotor. Hermetic compressor.   The hermetic compressor according to claim 2, wherein the connecting member is passed through a gap between the armature windings.   The hermetic compressor according to any one of claims 1 to 3, wherein the working fluid is a refrigerant made of carbon dioxide.

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