JPH1193871A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically discharge oil gathering in a delivery chamber in operation by arranging a delivery port in an upper part of the delivery chamber, and arranging an oil sucking-out passage where one end side oil sucking-out port is positioned inside the delivery port and the other end side oil inlet is positioned under an opening of the delivery chamber. SOLUTION: A delivery port 86 is arranged in an upper part of a delivery chamber 85, that is, above opening parts 69a and 69b of a fixed scroll 52. An ejector pipe 87 is arranged so as to extend in the vertical direction along the inside of a front end wall of a cover 43, and so that an upper end oil sucking- out port 87a is positioned inside the delivery port 86, and that a lower end oil inlet 87b is positioned in the lower end vicinity of the delivery chamber 85 under the opening parts 69a and 69b. Oil gathering in a lower part of the delivery chamber 85 is delivered to external piping 120 from the delivery port 86 together with a refrigerant since suction force acts by an air current of the refrigerant passing through the delivery port 86. Therefore, even if it is operated for many hours, an oil level does not go over the opening parts 69a and 69b, and stable refrigerant delivery capacity can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for an air conditioner or the like, and more particularly to a structure for discharging oil in a discharge chamber to the outside.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, JP-A-9-14163 and JP-B-5-45800,
A scroll compression portion in which a compression chamber is formed by combining a fixed scroll and an orbiting scroll in a casing of the compressor, and a drive shaft for driving the orbiting scroll,
A suction chamber communicating with the suction side of the scroll compression section and a discharge chamber communicating with the discharge side of the scroll compression section are provided,
There is known a scroll compressor in which a suction port and a discharge port for connecting the suction chamber and the discharge chamber to external pipes are provided in a casing. In the scroll compressor, when the scroll compression section is driven, the fluid to be compressed is sucked in from the suction chamber side, compressed by the scroll compression section, and discharged from the discharge chamber side.

[0003] Usually, the scroll compressor is provided with an oil reservoir at a lower portion in a casing.
While oil is supplied from the oil reservoir to each lubricated portion, the lubricated oil is collected in the oil reservoir, and oil separated from the fluid to be compressed in the casing is also collected in the oil reservoir. It has become.

[0004]

In the compressor disclosed in Japanese Patent Application Laid-Open No. Hei 9-14163, the lower part of the discharge chamber in the casing is used as an oil storage part. Reduce the amount of oil mixed into the compressed fluid introduced into the scroll compression section,
In order to improve the compression efficiency, the suction chamber and the oil reservoir are connected to each other so that the suction chamber has an oil separation function,
A structure was created in which the discharge chamber was isolated from the suction chamber and the oil reservoir.

[0005] However, if the discharge chamber is separated from the oil storage section in this way, even if the suction chamber has an oil separating function, the oil to be slightly mixed into the fluid to be introduced into the scroll compression section. Therefore, the oil mixed into the compressed fluid reaches the discharge chamber and accumulates at the lower end. When the operation is performed for a long period of time, the amount of oil accumulated in the discharge chamber gradually increases and is discharged irregularly with the refrigerant, so that there is a problem that stable refrigerant discharge performance cannot be obtained.

[0006] In view of such circumstances, an object of the present invention is to provide a scroll compressor which has a simple structure and is capable of automatically discharging oil accumulated in a discharge chamber during operation.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides, in a casing, a scroll compression section composed of an orbiting scroll and a fixed scroll, a suction chamber communicating with a suction side of the scroll compression section, A discharge chamber is provided on the discharge side of the scroll compression section through an opening, and a suction port and a discharge port for connecting the suction chamber and the discharge chamber to external piping are formed in a casing. The oil suction passage is provided at the upper part of the chamber, and the oil suction port at one end is located inside the discharge port, and the oil inlet at the other end is provided below the opening of the discharge chamber. .

According to this structure, a suction force acts on the oil suction passage by the flow of the fluid to be compressed discharged from the discharge port, whereby the oil is discharged from the scroll compression section to the discharge chamber through the opening for discharging the refrigerant. Oil is sucked up from the lower part of the discharge chamber, and is discharged from the discharge port to the external pipe together with the fluid to be compressed. As a result, the oil level of the discharge chamber is below the opening, so that the refrigerant flowing from the opening to the discharge port in the discharge chamber is not trapped while bubbling oil.

In this scroll compressor, the oil suction passage may be formed by a pipe assembled in the discharge chamber, or may be formed integrally with a wall constituting the discharge chamber.

In addition, an oil storage section is provided at a lower portion of the casing, and the suction chamber communicates with the oil storage section to form an oil separation chamber, in which oil mixed into the fluid to be compressed discharged from the discharge port is externally provided. If the oil is returned to the suction side via the oil separator and collected in the oil reservoir via the suction port and the suction chamber, the oil discharged from the discharge chamber to the external pipe together with the fluid to be compressed can be separated and collected. Done effectively.

[0011]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of an air conditioner shown as an example of an apparatus using the scroll compressor of the present invention.
The air conditioner includes a scroll compressor 1 driven by a water-cooled gas engine 2, a refrigerant circuit 15 incorporating the compressor 1, and a cooling water circuit 30 for cooling the engine.

The engine 2 and the compressor 1 are connected by attaching a belt 4c to a pulley 4a attached to the output shaft 3 of the engine 2 and a pulley 4b provided on the input side of the compressor 1. ing.

An intake pipe 5 is connected to the engine 2.
An air cleaner 6, a mixer 7, and a throttle valve 8 are provided in the intake pipe 5. A fuel supply pipe 9 is connected to the mixer 7, and an electromagnetic valve 10, a zero governor 11, and a fuel control valve 12 are interposed in the fuel supply pipe 9. Further, an exhaust pipe 13 is connected to the engine 2.
An exhaust gas heat exchanger 14 is interposed.

The refrigerant circuit 15 circulates the refrigerant discharged from the compressor 1 back to the compressor 1 through a condenser, an expansion valve and an evaporator. In the example shown in the figure, an air conditioner capable of cooling and heating is used. In order to configure, a four-way valve 16 for switching the refrigerant circulation path is provided, and an outdoor heat exchanger 17, an electronic expansion valve 18, and an indoor heat exchanger 19 are provided. Between the compressor 1 and the four-way valve 16,
Discharge port of compressor 1 and first port 16 of four-way valve 16
a and the second line of the four-way valve 16
A suction-side line 22 that connects the port 16b and the suction port of the compressor 1 is provided. The discharge side line 21 is provided with an oil separator 23 for separating oil from high-pressure refrigerant. An accumulator 24 for separating the liquid-phase refrigerant and returning only the gas-phase refrigerant to the suction port of the compressor 1 is provided in the suction-side line 22.

The third port 16c of the four-way valve 16
The outdoor heat exchanger 17, the electronic expansion valve 18, the indoor heat exchanger 19, and the fourth port 16d of the four-way valve 16 are connected by lines 25, 26, 27, and 28. And
During cooling, the first port 16a and the third port 16c of the four-way valve 16 are connected, and the fourth port 16d and the second port 16b are connected, as shown by the solid arrow in FIG. The refrigerant discharged from the compressor 1 passes through the outdoor heat exchanger 17, the electronic expansion valve 18, and the indoor heat exchanger 19 in this order and returns to the compressor 1, and the outdoor heat exchanger 17 is a condenser and the indoor heat exchanger 19 is Functions as an evaporator. On the other hand, during heating, the first port 16a and the fourth port 16d of the four-way valve 16 are connected,
The communication between the third port 16c and the second port 16b allows the refrigerant discharged from the compressor 1 to pass through the indoor heat exchanger 19, the electronic expansion valve 18, and the outdoor heat exchange as indicated by the dashed arrow in FIG. After returning to the compressor 1 through the heat exchanger 17 in this order, the indoor heat exchanger 19 functions as a condenser and the outdoor heat exchanger 17 functions as an evaporator.

The line 25 between the third port 16c of the four-way valve 16 and the outdoor heat exchanger 17 has a double pipe heat exchanger 2
9 is provided, and cooling water obtained by collecting engine exhaust heat from the cooling water circuit 30 is guided to the double-pipe heat exchanger 29 mainly during heating. The cooling water circuit 30 is configured so that the cooling water flowing in a certain direction by the water pump 32 circulates through the exhaust gas heat exchanger 14, the engine water jacket 33, the thermostat 34, the radiator 35, and the like. A water passage 31 is provided, and a bypass passage 36 is provided which branches from the radiator 35 upstream of the main cooling water passage 31 and joins the main cooling water passage 31 downstream of the radiator 35 through the double pipe heat exchanger 29. ,
A linear three-way valve 37 is provided at a branch point of the bypass passage 36.

FIGS. 2 to 7 show the structure of the scroll compressor 1. FIG. The scroll compressor 1
Inside the casing 40, a scroll compressor 50 composed of an orbiting scroll 51 and a fixed scroll 52, a drive shaft 55 for driving the scroll compressor 50 by orbiting the orbiting scroll 51, It has a suction chamber 80 for sucking the fluid to be compressed according to the drive, and a discharge chamber 85 for discharging the fluid to be compressed according to the drive of the scroll compression unit.

The casing 40 includes a case 41 forming an outer shell on the rear side (left side in FIG. 1) and a main housing 42 forming a peripheral wall on the front side (right side in FIG. 1). The outer peripheral wall 52c of the fixed scroll 52 is disposed so as to form a part of the casing 40, and a cover 43 is further disposed in front of the outer peripheral wall 52c. The case 41, the main housing 42, the fixed scroll 52, and the cover 43 are connected to each other by bolts, thereby forming the casing body 40a surrounding the drive shaft 55, the scroll compression section 50, the suction chamber 80, and the discharge chamber 85. It is configured.

An oil pan 40b as an oil storing section is provided below the casing 40. The oil pan 40b is composed of a part 44 integrally connected to the case 41 and protruding downward from a part constituting the casing body 40a, and an oil pan cover 45 attached in front of this part. .

The internal structure of the scroll compressor 1 will be described more specifically. The orbiting scroll 51 of the scroll compression unit 50 includes a bottom plate 51a, a spiral body 51b protruding from the bottom plate 51a toward the fixed scroll 52, and a scroll shaft 51c protruding from the back surface of the bottom plate 51a toward the drive shaft 55. And the fixed scroll 52 has
A bottom plate 52a and the orbiting scroll 51 from the bottom plate 52a
It has a spiral body 52b protruding toward the side and an outer peripheral wall 52c forming a part of the casing 40. The spiral bodies 51b and 52b of the scrolls 51 and 52 are combined with each other by being shifted by 180 °, and between them. A compression chamber 53 is formed.

The scroll shaft 51c is eccentrically supported at the tip of the drive shaft 55 via a crank mechanism including a slide bush 60 and the like. That is, a large-diameter separate cylindrical part is fixed to the distal end of the drive shaft 55 to form a cylindrical shaft portion 55a. Inside the cylindrical shaft portion 55a, the slide bush 60 is mounted. It is assembled so as to be slidable within a predetermined range in a predetermined direction perpendicular to the direction and to co-rotate with the drive shaft 55. The slide bush 60 has a through hole 60a formed at a position offset in the sliding direction with respect to the center. A scroll shaft 51c of the orbiting scroll 51 is supported via the inner bush 62 provided.

The orbiting scroll 51 mainly includes a centrifugal force caused by revolving around the drive shaft 55 eccentrically, a rotational driving force from the slide bush 60, and the orbiting scroll 51 includes a fixed scroll 52. And a reaction force based on the gas pressure from the refrigerant that compresses while rolling. The orbiting scroll 51 is pressed against a contact portion with the orbiting scroll 51 by the combined force of these various forces. A reaction force against this pressing force, that is, a reaction force also acts on the orbiting scroll 51. Both scrolls 51, 52
The sealing function of the wrap portion, which is the contact portion of, is obtained by the pressing force. This contact portion is on an extension extending from the center of the drive shaft 55 through the center of the scroll shaft 51c,
The two scrolls 5 are positioned on a line rotated around the center of the scroll shaft 51c by a predetermined angle of 90 ° or less from the extension in the rotation direction or the anti-rotation direction of the drive shaft 55.
1, 52 shapes are set. The smaller this predetermined angle is,
The centrifugal force contributes to the pressing force (that is, the sealing property), and the larger the predetermined angle taken in the rotation direction, the more the rotational driving force contributes to the pressing force. In the present embodiment, the predetermined angle is set to be small, and in order to prevent the pressing force from becoming too large during high rotation when the centrifugal force of the orbiting scroll 51 becomes large, scrolling is performed around the center of the slide bush 60. A balancer 63 is provided on the opposite side of the shaft 51c.

A suction port 81 provided above the rear end of the case 41 and connected to the suction side line 22 has a drive shaft 55
The lower end of the suction boat 67 is located substantially at the same height as the center of the drive shaft 55 and is horizontally separated from the drive shaft 55.

A wall 42a connected to the main housing 42 is located around the drive shaft 55 behind the orbiting scroll 51, and a thrust plate 64 and a thrust plate 64 are provided between the wall 42a and the orbiting scroll 51. An Oldham ring 65 is arranged. Oldham ring 65
Is configured to be able to swing in an annular Oldham chamber 66 formed between the wall portion 42a and the orbiting scroll 51, and to allow the orbiting scroll 51 to rotate in the radial direction while preventing its rotation. Orbiting scroll 51 and wall 4
2a.

With the rotation of the drive shaft 55, the scrolls 51b, 52b of the scrolls 51, 52 are moved 180 degrees.
The orbiting scroll 51 rotates (revolves) around the center of the fixed scroll 52 without rotating while maintaining contact with each other, thereby moving the refrigerant in the compression chamber 53 from the outer peripheral side to the inner peripheral side. It is designed to be compressed.

The suction port 6 serving as a refrigerant flow passage between the suction chamber 80 and the scroll compression section 50 is provided in the wall 42a.
7, a notch 68 corresponding to the suction port 67 is provided in the bottom plate 51a of the orbiting scroll 51. A discharge port 69 is provided near the center of the bottom plate 52a of the fixed scroll 52, and a reed valve for preventing backflow is attached to the outer surface of the bottom plate 52a so as to cover the discharge port. In the illustrated example, the discharge port 69
Is branched to form two openings 69a and 69b, and two reed valves 70a and 70b are provided correspondingly.

The drive shaft 55 is rotatably supported by the casing 40 in a state where the drive shaft 55 extends horizontally in a substantially horizontal direction. That is, the cylindrical shaft portion 55a on the distal end side of the drive shaft 55 is rotatably supported via the main bearing 72 on the drive shaft support portion 71 provided on the inner peripheral side of the wall portion 42a, and the rear side. The shaft portion 55b is rotatably supported by a drive shaft support portion 73 connected to the case 41 via an auxiliary bearing 74. The rear end (the left end in FIG. 1) of the drive shaft 55 protrudes outward from the casing 40. A pulley 4b is provided around the drive shaft 55, and an electromagnetic clutch 57 is provided between the pulley 4b and the drive shaft 55. When the electromagnetic clutch 57 is turned on, the power from the engine 2 (see FIG. 1) is transmitted to the drive shaft 55 and
5 rotates.

At the portion where the rear end of the drive shaft 55 penetrates the case 41, a seal is provided to prevent refrigerant or oil from flowing out of the suction chamber 80. Particularly in the example shown in FIG. To enhance the sealing performance, a double seal of a mechanical seal 75 and a lip seal 76 is provided. It should be noted that balancers 77a and 77b are disposed on the outer periphery of the front portion of the drive shaft 55 on the eccentric side and the non-eccentric side of the scroll shaft, and covers 78a and 78b are provided around the balancers 77a and 77b.

The cover 78a is bolted to the case 41, the cover 78b is bolted to the main housing 42, and both covers 78a, 78b and a plate 94 described below.
By this, the internal space and the suction chamber 80 described below are partitioned,
This makes it difficult for the refrigerant in the suction chamber 80 described below to enter the main bearing 72 disposed in the internal space, the slide bush 60, the portion between the slewing bearing 61 and the inner bush 62, and the like.

The suction chamber 80 is provided with the scroll compression section 50
The suction port 81 communicates with the suction chamber 80 and is formed between the suction chamber 80 and the scroll compression unit 50 via the suction port 67. Communicating.

Further, the suction chamber 80 communicates with the oil pan 40b and has a function as an oil separation chamber. That is, the suction chamber 80 and the oil pan 40 located therebelow.
b, through holes 112 and 113 communicating the suction chamber 80 and the oil pan 40 b are provided in the partition wall 111, so that the oil from the suction side line passes through the suction chamber 80 while the refrigerant passes through the suction chamber 80. Is separated and the refrigerant after oil separation is sent to the front scroll compression section 50, and the separated oil is collected in the oil pan 40b through the through holes 112 and 113. A baffle plate 114 is arranged below the rear through-hole 112. A pipe 115 extending diagonally downward is attached to the through hole 113 on the front side.

On the other hand, the discharge chamber 85 is provided in front of the scroll compression section 50, and is covered with a cover 43.
The discharge chamber 85 communicates with the scroll compression section 50 via the discharge port 69. A discharge port 86 communicating with the discharge chamber 85 is provided on the cover 43, and an ejector pipe 87 constituting an oil suction passage is provided inside the discharge chamber 85, and the structure thereof will be described later in detail.

An oil pump 90 is disposed below the drive shaft 55 at a rear portion in the case 41. In this oil pump 90, the pump shaft 91 is connected to the drive shaft 55.
The pump shaft 91 is fixed to the rear end wall of the case 41 with bolts, and the pump shaft 91 is connected to the drive shaft via gears 92 and 93. The gear 92 is a drive shaft 55
Is fixed not only in the rotational direction but also in the longitudinal direction. A plate 94 fixed to the case 41 is located in front of the gear 92, and a thrust bearing 95 is interposed between the plate 94 and the gear 92 and between the gear 92 and the drive shaft support 73. Have been.

The oil inflow port and the oil outflow port of the oil pump 90 are connected to passages 101 and 102 formed in the rear end wall of the case 41. The upstream side of the passage 101 leading to the oil inflow port is downward. To the oil pan 4
Ob is connected to an oil strainer 96 provided therein, and the downstream side of the passage 102 leading to the oil outlet extends upward to reach the drive shaft support 73 in which the auxiliary bearing 74 is disposed.

Then, the passage 10 from the oil pan 40b
1. The auxiliary bearing 74 passes through the oil pump 90 and the passage 102.
A part of the oil guided to the arrangement portion is supplied to the mechanical seal 75, another part is supplied to the thrust bearing 95 and the gear 92.93, and the rest is formed inside the drive shaft 55. The gas passes through the passages 106 and 107 and is ejected from a nozzle 108 provided at the end of the drive shaft 55 to be supplied to the turning bearing 61 and the main bearing 72.

The oil after lubricating the mechanical seal 75 and the oil after lubricating the thrust bearing 95 pass through the through hole 112 provided in the partition wall 111 together with the oil separated from the refrigerant in the suction chamber 80. And returned to the oil pan 40b. The oil that has lubricated the slewing bearing 61 and the main bearing 72 is supplied to the return passage 1 formed in the wall 42 a in the main housing 42.
The oil return hole 110 provided in the lower portion of the wall portion 42a after passing through the Oldham chamber 66 after being partially guided for lubrication of the thrust surface of the thrust plate 64.
It is led to. Then, the oil that has passed through the return passage 109 and the oil return hole 110 is guided to the through hole 113, and is guided to the oil pan 40b through the pipe 115.

FIG. 8 specifically shows a structure for sucking out oil in the discharge chamber 85. In this figure, the discharge port 86 is located above the discharge chamber 85, that is, the openings 69a, 6a.
9b, is provided at the upper end of the cover 43 in this embodiment, and comprises a vertical passage that is open upward. An external pipe 120 constituting the discharge side line 21 in FIG. 1 is connected to the discharge port 86.

The ejector pipe 87 constituting the oil suction passage extends substantially vertically along the inner surface of the front end wall of the cover 43, and the oil suction port 87 a at one end (upper end) is located inside the discharge port 86. In a state where the oil inlet 87b at the other end (lower end) is located near the lower end of the discharge chamber 85 below the openings 69a and 69b, the cover 4 is bolted through the mounting bracket 121.
3 is fixed. A temperature sensor 122 detects the temperature of the refrigerant discharged from the discharge port 86 and is attached to the cover 43 so as to face the discharge port 86. Reference numeral 123 denotes a drain port provided at the lower end of the discharge chamber 85, which is normally closed by the plug 124.

According to the above-described scroll compressor 1 of the present embodiment, when the drive shaft 55 is rotated by the drive force transmitted from the external engine, the scroll compressor 50
As the orbiting scroll 51 orbits, the refrigerant as the fluid to be compressed is sucked into the scroll compression section 50 from the suction port 81 via the suction chamber 80 and the suction port 67, and is discharged from the discharge port 69 after being compressed here. It is sent out to the chamber 85 and discharged through the discharge port 86 to the external pipe 120.

Incidentally, the suction chamber 80 also has a function as an oil separation chamber, and oil mixed in the refrigerant while the refrigerant passes through the suction chamber 80 is separated and collected in the lower oil pan 40b. You. Therefore, the scroll compression unit 5
The amount of oil mixed in the refrigerant guided to 0 is reduced, and the compression efficiency in the scroll compressor 50 is increased.

As described above, the oil is separated in the suction chamber 80. However, some of the oil that cannot be separated is mixed into the refrigerant guided to the scroll compression unit 50, and this oil flows through the scroll compression unit 50 together with the refrigerant. Via discharge chamber 85
And oil gradually accumulates in the lower part of the discharge chamber 85.

However, the oil remaining in the lower part of the discharge chamber 85 is sucked out through the ejector pipe 87 with the outflow of the refrigerant from the discharge port 86. That is, a pressure drop occurs around the oil suction port 87a at the upper end of the ejector pipe 87 due to the air flow of the refrigerant passing through the discharge port 86, and this air flow exerts a suction force on the ejector pipe 87, and the suction force discharges Oil is sucked up from the lower part of the chamber 85, mixed into the airflow of the refrigerant, and discharged from the discharge port 86 to the external pipe 120 together with the refrigerant.

Therefore, when a large amount of oil accumulates in the lower part of the discharge chamber 85 during a long-term operation as in the prior art,
The oil level exceeds the closing portions 69a and 69b from the scroll compression part 50 to the discharge chamber 85, and the discharged refrigerant causes oil to bubbling, and is discharged irregularly together with the refrigerant from the discharge port 86 to the external pipe 120. As a result, stable refrigerant discharge capacity cannot be obtained, and when the scroll compressor is used for an air conditioner or a refrigeration system, stable performance of these systems cannot be obtained. Even if the oil level is increased, the opening 69a. A stable refrigerant discharge capacity can be obtained without exceeding 69b, and in a system using a scroll compressor, stable system performance can be obtained.

Also, when the scroll compressor is started to start the circulation of the refrigerant, the refrigerant liquefied and stored in the suction side line 22 at the time of the stop may bubble into the suction chamber 80 due to a rapid drop in pressure. However, the refrigerant liquefied in the suction chamber 80 together with the oil is separated, so that it is difficult for the refrigerant to reach the scroll compression unit 50. The liquefied refrigerant eventually vaporizes under the reduced pressure state of the suction chamber 80, and is sucked into the scroll compression unit 50. Also, when the scroll compressor is started, the oil is started from the lubricated part into the suction chamber 80 by the start of the oil pump, and a small amount of the oil is sucked into the scroll compression part 50 while the suction chamber 80 is turned on.
The amount of gaseous refrigerant present in the scroll compressor 5 is small.
Since the amount of refrigerant sucked into the refrigerant chamber 0 is small, the suction effect of the refrigerant is reduced and the oil is accumulated in the discharge chamber 85. However, since the discharge chamber 85 has a predetermined volume below the openings 69a and 69b, the oil is retained. Can be stored. And, with the passage of time, with the increase in the refrigerant discharge amount,
The oil in the discharge chamber 85 is discharged. The opening 69
a, the volume of the discharge chamber 85 below the 69b is the oil pan 4
Since the volume is smaller than 0b, the required oil amount of the air conditioner as a whole can be reduced.

Further, an oil circulation system for lubrication, which includes an oil van 40b, an oil pump 90, a suction treasure 80 serving as an oil separation chamber, and the like, is arranged on the low pressure side with the scroll compression section 50 as a boundary. That is, the oil that is sent from the oil pan 40b to the lubricated portion by the oil pump and rises in temperature enters the suction chamber 80, contacts the low-temperature gas-phase refrigerant, is cooled, and returns from the suction chamber 80 to the oil pan 40b. ,
There is no decrease in lubrication performance.

The oil mixed with the refrigerant discharged from the discharge port 86 is separated by an oil separator 23 (see FIG. 1) connected to the external pipe 120, returned to the suction side, and discharged from the suction port 81 together with the refrigerant. It enters the suction chamber 80, where it is separated and collected in the oil pan 40b.

The structure of the discharge port, the oil suction passage and the like are not limited to the above embodiment, but can be variously changed.

For example, in the above embodiment, the oil suction passage is provided separately from the cover 43 of the casing 40 by the pipe 8.
7, but as shown in FIG.
The oil suction passage 13
1 may be formed integrally. In the example shown in the drawing, a vertical passage 131 is formed below this portion so that the oil suction port 131a opens to the discharge port 86, and the wall of the cover 43 is cut across the lower end of the passage 131. An oil inlet 131b that opens at the lower part of the discharge chamber 85 is formed by forming a through passage 131c. The outer end of the passage 131c is closed by a plug 132.

Also, as shown in FIG.
May be formed laterally on the upper part of the wall such as the cover 43 constituting the discharge chamber 85. Also in this case, for example, an oil suction passage is formed by a pipe 141 as shown in the figure, and an oil suction port 141 at the upper end of the pipe 141 is formed.
a is opened to the discharge port 140, and an oil inlet 141b opening to the lower part of the discharge chamber 85 is formed at the lower part of the pipe 141. Alternatively, an oil suction passage may be integrally formed in a wall of the cover 43 or the like.

When the arrangement of the discharge ports is compared with the example shown in FIG. 8 and the example shown in FIG. 10, the arrangement space of the discharge ports 86 as shown in FIG. It can be compact. On the other hand, according to the arrangement of the discharge ports 140 as shown in FIG. 10, when the oil separator 23 (see FIG. Pipe length can be shortened.

As shown by a virtual line in FIG. 10, a discharge port 140 'may be provided below the openings 69a, 69b in the discharge chamber 85, and the discharge port 140 and the pipe 141 may be omitted. In this case, the oil is gradually stored in the lower part of the discharge chamber 85, and the oil level is changed to the discharge port 14.
When the pressure reaches 0 ', substantially the same amount of oil as the oil entering the discharge chamber 85 together with the refrigerant from the openings 69a and 69b is discharged from the discharge port 140' together with the refrigerant. Since the refrigerant always passes over the oil surface, the oil does not foam, and a stable refrigerant discharge capability is obtained.

[0053]

As described above, according to the present invention, in a scroll compressor having a scroll compression section, a suction chamber, and a discharge chamber in a casing, a discharge port connected to an external pipe is provided above the discharge chamber, The oil suction port is located inside the discharge port, and the oil inlet at the other end is provided with an oil suction passage located below the opening of the discharge chamber. Oil can be sucked up from the lower part of the discharge chamber through the oil suction passage by the flow of the compressed fluid, and the oil can be discharged from the discharge port to the external pipe together with the compressed fluid. Accordingly, a large amount of oil does not accumulate in the discharge chamber, and a stable refrigerant discharge capacity can be obtained.

In addition to the above configuration, the suction chamber communicates with the oil storage section to form an oil separation chamber, and oil mixed in the fluid to be compressed discharged from the discharge port is sucked through an external oil separator. If it is made to return to the side, the oil discharged from the discharge chamber can be easily collected in the oil reservoir.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an air conditioner shown as an example of application of a scroll compressor of the present invention.

FIG. 2 is a longitudinal sectional view of a scroll compressor according to one embodiment of the present invention.

FIG. 3 is a side view of a case in the scroll compressor and an oil pump, an oil strainer, and the like in the case as viewed from a line AA in FIG. 2;

FIG. 4 is a side view of the main housing and a mechanism inside the main housing taken along the line BB in FIG. 2 with the cover and both the revolving and fixed scrolls removed;

FIG. 5 is a side view of the main housing and its internal mechanism viewed from the line BB in FIG. 2 in a state where the orbiting scroll is assembled to the one shown in FIG. 4;

FIG. 6 is a side view of the main housing and its internal mechanism viewed from the line BB in FIG. 2 in a state where a fixed scroll is further assembled to the main housing shown in FIG. 5;

FIG. 7 is a side view of the scroll compressor as viewed from the right side of FIG. 2;

FIG. 8 is a cross-sectional view of a main part showing an embodiment of a structure for sucking oil in a discharge chamber.

FIG. 9 is a sectional view of a main part showing another embodiment of a structure for sucking out oil in a discharge chamber.

FIG. 10 is a cross-sectional view of a main part showing another embodiment of a structure for sucking oil from a discharge chamber.

[Explanation of symbols]

 Reference Signs List 1 scroll compressor 40 casing 40b oil pan 50 scroll compression section 51 orbiting scroll 52 fixed scroll 55 drive shaft 80 suction chamber 81 suction port 85 discharge chamber 86 discharge port 87, 141 ejector pipe 131 oil suction passage

Claims (4)

[Claims] In a casing, there are provided a scroll compression section composed of an orbiting scroll and a fixed scroll, a suction chamber communicating with the suction side of the scroll compression section, and a discharge chamber communicating with the discharge side of the scroll compression section via an opening. A scroll compressor in which a suction port and a discharge port for connecting the suction chamber and the discharge chamber to external pipes are respectively provided in a casing. A scroll compressor having an oil suction passage located inside the outlet and having an oil inlet at the other end located below the opening of the discharge chamber. 2. The scroll compressor according to claim 1, wherein said oil suction passage is formed by a pipe installed in a discharge chamber. 3. The scroll compressor according to claim 1, wherein said oil suction passage is formed integrally with a wall constituting a discharge chamber. 4. An oil storage section is provided at a lower portion of the casing, and the suction chamber communicates with the oil storage section to form an oil separation chamber, and oil mixed into the fluid to be compressed discharged from the discharge port is externally provided. The scroll compressor according to any one of claims 1 to 3, wherein the scroll compressor is returned to a suction side via an oil separator, and is collected in an oil reservoir through the suction port and the suction chamber.