JP2008088929A - 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: This compressor is provided with a delivery head 70 covering an anti-motor side of a compression mechanism 30 in a hermetic vessel 2, a delivery chamber 80 communicating with the compression mechanism and formed near the delivery head, and a lubricating oil separating device 71 including a separating chamber 74 positioned between the delivery chamber and a delivery port 87 communicating with the outside of the compressor and separating lubricating oil from working fluid in the separating chamber 74. The device includes a separating tube 86 formed integrated with the delivery port and extending toward the separating chamber, and a tubular projection part 72 formed integrated with the delivery head and forming an annular space in a state combined with an outer circumference surface of the separating tube. <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, when this lubricating oil is discharged out of the compressor and circulates in the refrigeration circuit, it becomes a factor of reducing the cooling capacity. Therefore, it is conceivable to increase the distance or passage area from the compression mechanism to the outside of the compressor to prevent the lubricant from being discharged outside the compressor. This is because the flow rate of the refrigerant becomes slow.

However, there is a concern that the space for reducing the flow rate of the refrigerant inside the compressor will have a large effect on the size and weight of the compressor, and a compressor with a built-in lubricating oil separator is known. (For example, refer to Patent Document 1). Specifically, the apparatus separates the lubricating oil from the compressed refrigerant in the process until the compressed refrigerant is guided from the discharge chamber to the discharge port. The separated lubricating oil is stored in an oil storage chamber below the separation chamber. Further, as another example of preventing the discharge of the lubricating oil to the outside of the compressor, a compressor having a built-in filter is also known (see, for example, Patent Document 2).
JP 2004-293543 A JP 2005-113861 A

By the way, in compressors that are used in the above-described refrigeration and air-conditioning equipment and the like and store lubricating oil under the hermetic container, in recent years, there has been a demand for further reduction in size and weight in order to be easily disposed in general households. .
In order to satisfy this requirement, it is necessary not only to incorporate a lubricating oil separation device and a filter, but also to improve the configuration itself of these lubricating oil separation devices. No special consideration has been given to this point.

  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, wherein a hermetic container contains therein a compression mechanism that compresses a working fluid containing lubricating oil and an electric motor that drives the compression mechanism, Is a hermetic compressor whose discharge pressure is generated by a compression mechanism, a discharge head that covers the counter-motor side of the compression mechanism in a sealed container, and a discharge chamber that is communicated with the compression mechanism and formed in the vicinity of the discharge head A separation chamber positioned between the discharge chamber and the discharge port communicating with the outside of the compressor, and a lubricant separation device that separates the lubricant from the working fluid in the separation chamber. The apparatus includes a cylindrical separation tube integrally formed at the discharge port and extending toward the separation chamber, and a cylindrical protrusion formed integrally with the discharge head and forming an annular space in combination with the outer peripheral surface of the separation tube. Part.

The invention according to claim 2 is characterized in that the cylindrical projection is fixed to the discharge head by welding.
Furthermore, in the invention described in claim 3, the cylindrical projection is formed with an ejection hole communicating with the discharge chamber and the annular space, and the hole axis of the ejection hole is inclined along the outer peripheral surface of the separation tube. It is characterized by having.

  Furthermore, in the invention according to claim 4, the sealed container includes a cylindrical body portion that houses the compression mechanism and the electric motor with the axis line being the vertical direction, and an upper lid that closes the upper side of the body portion to form a discharge chamber. The lower part of the body part is closed to form a lubricating oil storage chamber, and the lubricating oil separation device connects between the separation chamber and the oil storage chamber and stores the separated lubricating oil. It has a return path to return to the chamber.

  The invention according to claim 5 is characterized in that the working fluid is a refrigerant composed of carbon dioxide.

  Therefore, according to the hermetic compressor of the first aspect of the present invention, the counter-motor side of the compression mechanism is covered with the discharge head, and the discharge head is combined with the outer peripheral surface of the separation pipe to work fluid. A cylindrical projection that separates the lubricating oil from is integrally formed. The separation tube is integrally formed with the discharge port. And these separation pipes and the cylindrical projections together form an annular space to constitute a lubricating oil separation device, thereby providing a space for slowing down the flow rate of the working fluid inside the sealed container. While making it unnecessary, the lubricating oil rate (OCR) flowing out of the compressor can be suppressed with a simple mechanism. As a result, 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 invention described in claim 2, it is possible to suppress the rate of lubricating oil flowing outside the compressor with a simple mechanism. Further, according to the invention described in claim 3, the compressed working fluid is It reaches the discharge chamber to circulate in the sealed container. After that, it passes through the ejection hole of the projection and flows into the separation chamber, and descends while turning the outer peripheral surface of the separation tube. In this process, the lubricating oil in the working fluid is reliably separated from the working fluid.

Furthermore, according to the fourth aspect of the present invention, since the lubricating oil separated from the working fluid is guided and stored in the oil storage chamber through the return path, the risk of causing the compressor failure due to insufficient supply of the lubricating oil is solved. Is done.
Further, according to the invention described in claim 5, 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 4 of the housing 2 is airtightly fitted on the upper and lower sides by an upper lid 6 and a lower lid 8, respectively. Is sealed and discharge pressure is acting.
An electric motor (electric motor) 10 is accommodated in the body 4, and a rotating shaft 12 is disposed in the motor 10. The rotating shaft 12 is driven by energization of the motor 10. Further, the upper end side of the rotary shaft 12 is rotatably supported by the spindle frame 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 8. This lubricating oil is supplied to the motor 10 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. Furthermore, a lubricating oil inlet 19 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 23 via the inlet 19. Is done.

The unit 30 is disposed above the motor 10 in the body 4 and performs a series of processes of refrigerant suction, compression, and discharge.
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 revolving 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 80 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 so as to penetrate the end plate 34, and this discharge hole is more specifically provided on the counter-electric motor 10 side of the unit 30. Specifically, it is opened and closed by a discharge valve 82 arranged on the side opposite to the scroll of the fixed spiral body 32. Further, the anti-scroll side of the fixed spiral body 32 including the discharge valve 82 is covered with the discharge head 70, and the sound when the discharge valve 82 is opened is suppressed by the discharge head 70.

  By the way, a hollow discharge pipe (separation pipe) 86 for sending the compressed refrigerant in the discharge chamber 80 to the outside of the compressor is connected to an appropriate position of the upper lid 6, and a discharge port 87 which is one end of the discharge pipe 86. Connected to the above path. The compressor 1 of the present embodiment has a separation chamber 74 between the discharge chamber 80 and the discharge port 87, and the lubricating oil separation device that separates the lubricating oil from the refrigerant in the separation chamber 74. 71 is provided.

  More specifically, as shown in FIG. 2, an outer cylinder protrusion (cylindrical protrusion) 72 is integrally formed on the discharge head 70 by welding. The outer cylinder protrusion 72 bulges toward the discharge pipe 86 on the side opposite to the scroll of the fixed spiral body 32, partially surrounds the discharge pipe 86, and the outer cylinder of the lubricating oil separating device 71 is It is composed. Further, the front end opening of the outer cylinder projection 72 is fitted to the outer peripheral edge of the discharge pipe 86 without a gap. On the other hand, the lower side of the discharge pipe 86 is formed as a separation chamber 74, and the discharge pipe 86 extends toward the separation chamber 74 to constitute an inner cylinder of the lubricating oil separation device 71. An annular space is formed between the inner peripheral surface of the outer cylinder projection 72, in other words, between the inner peripheral surface of the separation chamber 74 and the outer peripheral surface of the discharge pipe 86. Further, the outer cylinder projection 72 is formed with coolant jet holes (spout holes) 76 that allow the discharge chamber 80 and the annular space to communicate with each other. As shown in FIG. The hole axis is inclined along the outer peripheral surface of the discharge pipe 86.

Further, in the compressor 1 of the present embodiment, a return path 90 that allows the separation chamber 74 and the oil storage chamber 23 to communicate with each other is formed in the fixed spiral body 32 and the spindle frame 14.
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 4 via the suction pipe 84 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 80 so as to circulate in the housing 2. Thereafter, the refrigerant passes through the refrigerant ejection hole 76 of the outer cylinder projection 72 and flows into the separation chamber 74, and descends while turning the outer peripheral surface of the discharge pipe 86. In this process, the lubricating oil in the compressed refrigerant is reliably separated from the refrigerant based on the principle of centrifugal separation and adheres to the inner peripheral surface of the separation chamber 74. At that time, the compressed refrigerant rises through the inside of the discharge pipe 86 and is sent out of the compressor.

On the other hand, the lubricating oil separated from the compressed refrigerant flows down along the inner peripheral surface of the separation chamber 74, and is guided and stored in the oil storage chamber 23 through the return path 90 and the introduction port 19.
As described above, according to the present embodiment, the anti-scroll side of the fixed spiral body 32 is covered with the discharge head 70, and the discharge head 70 is lubricated from the refrigerant in combination with the outer peripheral surface of the discharge pipe 86. An outer cylinder projection 72 for separating oil is integrally formed. The discharge pipe 86 is integrally formed with the discharge port 87. The discharge pipe 86 and the outer cylinder projection 72 together form an annular space to constitute the lubricating oil separation device 71, thereby reducing the flow rate of the refrigerant in the housing 2. The lubricating oil rate (OCR) flowing out of the compressor can be suppressed with a simple mechanism. As a result, the compressor can be further reduced in size and weight, and the manufacturing cost of the compressor can be reduced.

Further, by suppressing the lubricating oil rate, the efficiency of each heat exchanger of the refrigeration system is improved and the cooling capacity is prevented from being lowered, contributing to energy saving of the refrigeration system.
Furthermore, since the lubricating oil in the compressed refrigerant is reliably separated from the refrigerant based on the principle of centrifugal separation and is stored in the oil storage chamber 23 through the return path 90, the compressor is broken due to insufficient supply of lubricating oil. The fear is resolved. After that, the lubricating oil circulates again by the drive of the oil pump 22, so that the lubricating surface of the compressor 1 is sufficiently lubricated and the function of the sliding surface as a seal is fully exhibited. Extending the service life of the machine is achieved.

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 sectional drawing which follows the III-III line of FIG.

Explanation of symbols

1 Hermetic compressor 2 Housing (sealed container)
4 trunk 6 upper lid 8 lower lid 10 electric motor (electric motor)
14 Spindle frame 23 Oil storage chamber 30 Scroll unit (compression mechanism)
32 Fixed spiral body 70 Discharge head 71 Lubricating oil separator 72 Outer cylinder projection (cylindrical projection)
74 Separation chamber 76 Refrigerant ejection hole (ejection hole)
80 Discharge chamber 86 Discharge pipe (separation pipe)
87 Discharge port 90 Return path

Claims (5)

In a sealed compressor in which a compression mechanism that compresses a working fluid containing lubricating oil and an electric motor that drives the compression mechanism are housed in the sealed container, and the inside of the sealed container becomes a discharge pressure by the compression mechanism.
A discharge head that covers the counter-motor side of the compression mechanism in the hermetic container, a discharge chamber formed in the vicinity of the discharge head in communication with the compression mechanism, and in communication with the discharge chamber and the outside of the compressor. A separation chamber positioned between the discharge port and a lubricant separation device for separating the lubricant from the working fluid in the separation chamber;
The lubricant separator is
A cylindrical separation tube integrally formed with the discharge port and extending toward the separation chamber;
A hermetic compressor, comprising: a cylindrical projection formed integrally with the discharge head and forming an annular space in combination with an outer peripheral surface of the separation tube.   The hermetic compressor according to claim 1, wherein the cylindrical projection is fixed to the discharge head by welding.   The cylindrical projection is formed with a jet hole that communicates the discharge chamber and the annular space, and a hole axis of the jet hole is inclined along the outer peripheral surface of the separation tube. The hermetic compressor according to claim 1 or 2. The sealed container includes a cylindrical barrel portion that houses the compression mechanism and the electric motor with an axis line in the vertical direction, an upper lid that closes an upper side of the barrel portion to form the discharge chamber, and a lower portion of the barrel portion. It is composed of a lower lid that closes the side to form a lubricating oil storage chamber,
The said lubricating oil separation apparatus has a return path which connects between the said separation chamber and the said oil storage chamber, and returns the isolate | separated lubricating oil to the said oil storage chamber. The hermetic compressor according to item.   The hermetic compressor according to any one of claims 1 to 4, wherein the working fluid is a refrigerant made of carbon dioxide.

Images