JP3873813B2 - Scroll compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to noise reduction of a scroll compressor.
[0002]
[Prior art]
Conventionally, scroll compressors are widely known as compressors used in refrigerators and air conditioners. This scroll compressor takes in fluid drawn from a suction port provided in a casing into a compression mechanism composed of a fixed scroll and a movable scroll, and changes the volume of a fluid chamber formed between the fixed wrap and the movable wrap. It compresses using.
[0003]
Generally, the fluid compressed in the fluid chamber is directly discharged into the casing from a discharge port formed at the center of the fixed side end plate portion. Some scroll compressors have a casing divided into a low pressure chamber and a high pressure chamber. In such a scroll compressor, the compressed fluid is sent to the high pressure chamber side from the compression mechanism arranged on the low pressure chamber side. For example, the compressed fluid compressed by the compression mechanism is sent out to the high pressure chamber side in the casing by a fluid flow path formed in the drive shaft that drives the movable scroll. The compressed fluid sent to the high pressure chamber side was directly discharged from the discharge port formed in the drive shaft to the high pressure chamber in the casing.
[0004]
[Problems to be solved by the invention]
However, the scroll compressor described above has the following problems.
[0005]
In the scroll compressor, the compressed fluid is intermittently discharged to the fluid flow path in the drive shaft as the movable scroll revolves. Therefore, the discharged fluid is accompanied by pulsation. The high-pressure fluid sent to the high-pressure chamber side through the fluid channel is discharged directly from the discharge port formed in the drive shaft to the high-pressure chamber. Therefore, when such a high-pressure fluid with pulsation is directly discharged into the space in the casing, there is a problem that the pulsation reverberates in the casing body and large noise and vibration are generated.
[0006]
The present invention has been made to solve such problems, and an object of the present invention is to provide a scroll compressor that reduces vibration and noise by reducing pulsation of discharged compressed fluid. To do.
[0007]
[Means for Solving the Problems]
The invention of claim 1 includes a hollow casing (5), a fixed scroll (14), a movable scroll (11) meshed with the fixed scroll (14) to form a fluid chamber (10), and the casing ( 5) a frame (6) that divides the interior into a first chamber (24) in which the fixed scroll (14) and the movable scroll (11) are installed and a second chamber (25) in which the discharge port (21) communicates; The present invention is directed to a scroll type compressor that includes a drive shaft (3) that engages with the movable scroll (11) and penetrates the frame (6) and is rotatably supported by the frame (6). A scroll compressor (1) according to the present invention includes a bearing member (8) that is installed in a second chamber (25) in the casing (5) and rotatably supports the drive shaft (3). On the other hand, the bearing member (8) has a muffler chamber (83) partitioned from the second chamber (25) and a communication path (86) for communicating the muffler chamber (83) with the second chamber (25). ) And are formed. The drive shaft (4) is formed with a fluid flow path (19) for guiding fluid from the fluid chamber (10) to the muffler chamber (83). In addition, an oil supply pump (89) is provided that sucks lubricating oil that is driven by the drive shaft (3) and is stored in the casing (5) , while the oil supply pump (89) is attached to the bearing member (8) . The muffler chamber (83) is formed together with the bearing member (8) .
[0008]
The invention of claim 2 is the scroll compressor according to claim 1, wherein the bearing member (8) is formed with a slide bearing (82) for supporting the drive shaft (3). der Ru.
[0009]
According to a third aspect of the present invention, in the scroll compressor according to the first aspect, the second chamber (25) passes from the muffler chamber (83) to the second chamber through the communication passage (86) of the bearing member (8). The scroll compressor is provided with an oil droplet removing member (27) for removing oil droplets in the fluid flowing out to (25).
[0010]
A fourth aspect of the present invention, in the scroll type compressor according to claim 3, in addition to the first muffler chamber formed in the bearing member (8) (83) is partitioned by the oil droplet removing member (27) with the It is a scroll type compressor provided with the 2nd muffler chamber (87) into which the fluid which passed the communicating path (86) of the bearing member (8) is introduced.
[0011]
-Action-
The scroll compressor (1) described in claim 1 has a hollow casing (5). The inside of the casing (5) is partitioned into a first chamber (24) and a second chamber (25) by a frame (6). A fixed scroll (14) and a movable scroll (11) are housed in the first chamber (24). The fixed scroll (14) meshes with the movable scroll (11) to form a fluid chamber (10). The fluid flowing into the first chamber (24) in the casing (5) is taken into the fluid chamber (10).
[0012]
The movable scroll (11) is driven by the drive shaft (3) to perform a revolving motion. The fluid chamber (10) moves while decreasing in volume toward the center of the movable scroll (11) as the movable scroll (11) revolves. The fluid taken into the fluid chamber (10) is compressed as the volume of the fluid chamber (10) decreases. The compressed fluid is discharged from a discharge port (21) formed near the center of the movable scroll (11). The fluid discharged from the discharge port (21) is sent to the second chamber (25) in the casing (5) through the fluid flow path (19) formed in the drive shaft (3).
[0013]
The drive shaft (3) passes through the frame (6) and passes from the first chamber (24) side to the second chamber (25) side, and is rotatably supported by the frame (6) and the bearing member (8). Is done.
[0014]
The fluid flow path (19) formed in the drive shaft (3) opens in a muffler chamber (83) formed in the bearing member (8). The pulsation of the compressed fluid discharged to the fluid flow path (19) propagates and spreads in the space in the muffler chamber (83) and is canceled and weakened.
[0015]
The compressed fluid whose pulsation is weakened in the muffler chamber (83) is sent out to the second chamber (25) through the communication passage (86).
[0016]
Further, the above bearing member (8) and oil supply pump for fueling the lubricating oil (89) and the bearing member (8) forming a muffler chamber (83), to reduce the pulsation of fluid in the muffler chamber (83).
[0017]
The scroll type compressor (1) according to claim 2 uses a slide bearing (82) for the bearing member (8) supporting the drive shaft (3), and the airtightness of the muffler chamber by the slide bearing (82). you ensure.
[0018]
The scroll compressor (1) according to claim 3 includes an oil droplet removing member (27), and the oil droplet removing member (27) passes through the communication path (86) of the bearing member (8) and is a muffler. Oil droplets mixed in the fluid flowing out from the chamber (83) to the second chamber (25) are removed. The lubricating oil separated from the fluid by the oil droplet removing member (27) is stored in the casing (5) and reused.
[0019]
The scroll compressor (1) described in claim 4 includes a second muffler chamber (87) formed by using an oil droplet removing member (27). The pulsation of the fluid flowing out from the first muffler chamber (83) through the communication passage (86) to the second muffler chamber (87) propagates to the space of the second muffler chamber (87) and spreads out. Together, it is further weakened. The fluid flows out from the second muffler chamber (87) through the oil droplet removing member (27) to the second chamber. When the fluid flows out into the second chamber (25), the oil droplet removing member (27) removes oil droplets mixed in the fluid.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a scroll compressor (1) of the present invention will be described in detail with reference to the drawings. The scroll compressor (1) according to the present invention is installed in a refrigerant circuit such as an air conditioner and is used to compress the refrigerant.
[0021]
<Configuration of scroll compressor>
As shown in FIG. 1, the scroll compressor (1) according to this embodiment includes a casing (5) that is a vertically long and cylindrical sealed container. The scroll compressor (1) includes a compression mechanism (2), a frame (6), an electric motor (7), a drive shaft (3), a bearing member (8), and the like inside a casing (5). This is a so-called hermetic scroll compressor.
[0022]
The body (53) of the casing (5) is sealed with a casing top (51) on the upper side and a casing bottom (52) on the lower side. The casing top (51) is provided with a suction port (22) for feeding the refrigerant into the compressor. A discharge port (23) for sending out the compressed refrigerant is provided in the body (53) of the casing (5) and below the frame (6).
[0023]
Inside the casing (5), a frame (6) is provided slightly above the center in the height direction. By this frame (6), the internal space of the casing (5) is partitioned into a first chamber (24) on the upper side of the frame (6) and a second chamber (25) on the lower side of the frame (6). .
[0024]
The first chamber (24) constitutes a low pressure chamber (24). A compression mechanism (2) having a fixed scroll (14) and a movable scroll (11) is installed in the low pressure chamber (24). The low pressure chamber (24) communicates with the suction port (22), and its internal pressure is almost the suction pressure.
[0025]
The second chamber (25) constitutes a high pressure chamber (25). An electric motor (7) and a bearing member (8) are installed in the second chamber (25). The electric motor (7) is disposed above the bearing member (8). Further, the low pressure chamber (24) communicates with the discharge port (23), and its internal pressure is almost the discharge pressure.
[0026]
The electric motor (7) includes a stator (71) and a rotor (72). The stator (71) is fixed substantially at the center in the casing (5). The rotor (72) is disposed inside the stator (71). The rotor (72) is coaxially fixed to the drive shaft (3).
[0027]
The drive shaft (3) has a lower end portion rotatably supported by a bearing member (8), and an upper end portion engaged with the movable scroll (11).
[0028]
The movable scroll (11) includes a movable side end plate (13) and a spiral movable side wrap (12) protruding toward the upper surface side of the movable side end plate (13). On the other hand, the fixed scroll (14) includes a fixed-side end plate portion (16) and a spiral fixed-side wrap (15) protruding to the lower surface side of the fixed-side end plate portion (16). The fixed side end plate portion (16) of the fixed scroll (14) is fixed to the frame (6). The fixed scroll (14) and the movable scroll (11) are disposed so as to face each other, and the fluid chamber (10) is defined by meshing the movable side wrap (12) and the fixed side wrap (15). .
[0029]
A refrigerant discharge port (21) is formed through the center of the movable side end plate (13). On the other hand, a refrigerant suction port (20) is formed on the outer peripheral side of the fixed scroll (14).
[0030]
On the back side of the movable side end plate portion (13) of the movable scroll (11), a bearing portion (18) protruding downward is formed so as to surround the opening portion of the discharge port (21). An eccentric portion (4) formed at the upper end portion of the drive shaft (3) is rotatably fitted in the bearing portion (18). The eccentric portion (4) is eccentric with respect to the axis of the drive shaft (3).
[0031]
In addition, an Oldham ring (9) is installed below the movable scroll (11). The Oldham ring (9) engages with the frame (6) and the movable scroll (11) to restrict the rotation of the movable scroll (11).
[0032]
A refrigerant channel (19) is formed in the drive shaft (3) as a fluid channel (19). The refrigerant channel (19) has one end opened at the upper end of the eccentric part (4) and the other end on the side surface of the drive shaft (3) located in the muffler chamber (83) of the bearing member (8). It opens as an outlet (26).
[0033]
A cylindrical seat (40) having a diameter slightly larger than the diameter of the refrigerant channel (19) is formed in the opening on the eccentric part side. Inside the seat portion (40), a spring (41) and a circular seal member (42) are housed so as to compress and shrink the spring (41). The diameter of the seal member (42) is set larger than the diameter of the discharge port (21). The upper end of the seal member (42) is pressed against the back surface of the movable side end plate portion (13).
[0034]
A bearing member (8) is fixed below the casing (5). The bearing member (8) rotatably supports the drive shaft (3).
[0035]
As shown in FIG. 2, the bearing member (8) according to this embodiment includes a base portion (84) and three leg portions (88) formed radially from the base portion (84). The bearing member (8) is fixed to the casing (5) by these leg portions (88).
[0036]
As shown in FIG. 3, the base (83) formed at the center of the bearing member (8) has a truncated cone-shaped boss (80) formed upward. A bearing hole (81) is formed so as to penetrate the center of the boss part (80). A metal (91) is provided in the bearing hole (81). Further, the lower end portion of the drive shaft (3) is inserted through the bearing hole (81).
[0037]
A predetermined clearance is secured between the inner wall surface of the metal (91) provided in the bearing hole (81) and the side surface of the drive shaft (3). The boss part (80) in which the bearing hole (81) is formed constitutes a plain bearing (82) for supporting the drive shaft (3).
[0038]
A cylindrical portion (85) extending downward is formed on the lower surface side of the base portion (84). The inner diameter of the cylindrical part (85) is formed larger than the outer diameter of the drive shaft (3). The space part (90) in the cylindrical part (85) communicates with the bearing hole (81) in the upper part and is open in the lower part.
[0039]
As shown in FIG. 1, the oil supply pump main body (28) is fixed to the opening of the space (90) with a bolt (30). An oil pump shaft (29) is attached to the center of the oil pump main body (28). Thus, the lower end of the space part (90) is closed by the oil pump main body part (28), and the first muffler chamber (83) is formed by the bearing member (8) and the oil pump (89). Has been.
[0040]
As shown in FIG. 3, a communication path (86) that penetrates the boss part (80) and communicates with the bearing member (8) is formed in the space part (90). As shown in FIG. 2, in the present embodiment, the three communication passages (86) are formed so as to surround the bearing hole (81).
[0041]
As shown in FIG. 1, a demister (27), which is an oil droplet removing member, is placed on the upper surface of the base (84) of the bearing member (8). The demister (27) is formed by laminating a plurality of mesh sheets made of a material having high heat resistance such as metal.
[0042]
The demister (27) is formed in a circular tube having substantially the same diameter as the lower end of the base (84). The demister (27) is fixed by a cover member (31) from above so as to be in close contact with the base (84). The demister (27), the bearing member (8), and the cover member (31) form a second muffler chamber (87) partitioned from the high pressure chamber (25). The second muffler chamber (87) communicates with the first muffler chamber (83) through the communication path (86).
[0043]
《Silent effect of scroll compressor》
The silencing effect of the compression mechanism (2) according to this embodiment will be described.
[0044]
When the electric motor (7) is energized, the rotor (72) rotates and the eccentric part (4) of the drive shaft (3) drives the movable scroll (11). When the movable scroll (11) starts revolving motion, the refrigerant sucked into the low pressure chamber (24) from the suction port (22) is sucked into the fluid chamber (10) from the suction port (20). When the suction of the previous refrigerant is completed, the movable scroll (11) moves toward the center ends of both wraps (14, 15) while contracting the volume of the fluid chamber. Accordingly, the movable scroll (11) starts sucking the next refrigerant. As described above, the movable scroll (11) intermittently sucks the refrigerant into the fluid chamber (10) between the movable scroll (11) and the fixed scroll (14).
[0045]
The refrigerant sucked into the fluid chamber (10) is compressed while moving toward the center ends of both wraps (14, 15). The fluid chamber (10) communicates with the discharge port (21) formed in the movable side end plate (13) when it moves near the center of the wrap. The refrigerant compressed to high pressure in the fluid chamber (10) is discharged from the discharge port (21) and flows into the refrigerant flow path (19) from the opening of the eccentric part (4) of the drive shaft (3). Thus, whenever the fluid chamber (10) communicates with the discharge port (21), the compressed refrigerant is intermittently discharged from the discharge port (21), and the refrigerant flow path (19) in the drive shaft (3) Flow into. The refrigerant flowing into the refrigerant channel (19) is accompanied by pulsation.
[0046]
The refrigerant with pulsation is discharged from the refrigerant outlet (26) to the first muffler chamber (83) in the bearing member (8). The pulsation of the refrigerant discharged to the muffler chamber (83) propagates to the space of the muffler chamber (83), is reflected by the inner wall surface of the muffler chamber (83), and is weakened by canceling out other pulsations. In the present embodiment, since the slide bearing (82) is adopted as the bearing member (8), the airtightness of the muffler chamber (83) is sufficiently ensured. Therefore, the pulsation in the muffler chamber (83) is reliably reduced.
[0047]
The refrigerant whose pulsation is weakened in the first muffler chamber (83) is sent out to the second muffler chamber (87) through the communication path (86). The fluid flowing from the first muffler chamber (83) into the second muffler chamber (87) is throttled by passing through the communication passage (86), and the pulsation is further reduced.
[0048]
The pulsation of the refrigerant discharged into the second muffler chamber (87) propagates into the muffler chamber (90), cancels out, and is further weakened.
[0049]
The refrigerant whose pulsation is weakened in the second muffler chamber (87) passes through the demister (27) and flows out into the high-pressure chamber (25) in the casing (5). At this time, lubricating oil or the like mixed in the refrigerant is captured by the demister (27) and removed. Further, the pulsation of the refrigerant is further reduced when passing through the demister (27). Therefore, the pulsation of the refrigerant is almost eliminated when it flows into the high pressure chamber (25) of the casing (5).
[0050]
The refrigerant discharged into the high pressure chamber (25) passes through the gap between the stator (71) of the electric motor (7) and the casing (5) and is discharged from the discharge port (23) to the refrigeration circuit. The refrigerant is subjected to condensation, expansion, and evaporation steps in the refrigeration circuit, and is then sucked again from the suction port (22) and compressed.
[0051]
-Modification-
As a modification of the above embodiment, one without the second muffler chamber (87) is also possible. The refrigerant whose pulsation is weakened in the first muffler chamber (83) flows out directly from the communication passage (86) to the high pressure chamber (25) in the casing (5).
[0052]
【The invention's effect】
According to the first aspect of the present invention, the fluid discharged from the compression mechanism (2) with pulsation passes through the muffler chamber (83) formed in the bearing member (8) and the communication path (86). As a result, the pulsation is weakened, and thereafter, it is fed into the casing (5). Therefore, the pulsation of the fluid flowing into the casing (5) can be reduced compared to the conventional one, and the noise and vibration of the scroll compressor (1) due to the pulsation of the compressed refrigerant can be reduced. Can do.
[0053]
Further, the muffler chamber (83) can be formed by using the oil supply pump (89) . Therefore, the muffler chamber (83) can be formed without adding new parts, and the configuration of the scroll compressor (1) can be simply maintained.
[0054]
In the invention of claim 2, the drive shaft (3) is supported by the plain bearing (82) of the bearing member (8). Since only a small gap is formed between the slide bearing (82) and the drive shaft (3), the muffler chamber (83) can be sufficiently sealed. Therefore, according to the present invention, by ensuring the air-tightness of the muffler chamber (83), Ru can be weakened pulsation of refrigerant flowing muffler chamber (83) securely.
[0055]
According to the invention of claim 3 , by providing the oil droplet removing member (27), the lubricating oil mixed in the fluid can be captured and recovered. Therefore, the lubricating oil mixed in the fluid discharged from the discharge port (22) can be reduced, and the occurrence of running out of the lubricating oil can be prevented.
[0056]
According to the invention of claim 4 , by forming the second muffler chamber (87) using the oil droplet removing member (27), not only the first muffler chamber (83) but also the second muffler chamber. The pulsation of the fluid can be weakened even when passing through (87). Therefore, by reducing the pulsation of the fluid in multiple stages, the pulsation of the fluid discharged into the casing (5) can be further reduced, and the noise and vibration of the scroll compressor (1) can be greatly reduced. it can.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a scroll compressor according to an embodiment.
FIG. 2 is a plan view of a bearing member according to the embodiment.
FIG. 3 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
(3) Drive shaft (5) Casing (8) Bearing member (11) Movable scroll (14) Fixed scroll (19) Fluid flow path (83) First muffler chamber (86) Communication path (87) Second muffler Room

Claims (4)

A hollow casing (5), a fixed scroll (14), a movable scroll (11) meshed with the fixed scroll (14) to form a fluid chamber (10), and a fixed scroll in the casing (5) ( 14) and a frame (6) partitioned into a first chamber (24) where the movable scroll (11) is installed and a second chamber (25) where the discharge port (21) communicates, and the movable scroll (11) A scroll compressor (1) provided with a drive shaft (3) that engages and penetrates the frame (6) and is rotatably supported by the frame (6),
While having a bearing member (8) installed in the second chamber (25) in the casing (5) and rotatably supporting the drive shaft (3),
The bearing member (8) includes a muffler chamber (83) partitioned from the second chamber (25), and a communication path (86) for communicating the muffler chamber (83) with the second chamber (25). Formed,
The drive shaft (3) is formed with a fluid flow path (19) for guiding fluid from the fluid chamber (10) to the muffler chamber (83) ,
An oil supply pump (89) that is driven by the drive shaft (3) and sucks lubricating oil stored in the casing (5) ;
It said oil supply pump (89) is a scroll type compressor that forms the muffler chamber (83) together with the bearing member is attached to the bearing member (8) (8). The scroll compressor according to claim 1, wherein
A scroll compressor in which the bearing member (8) is formed with a sliding bearing (82) for supporting the drive shaft (3). The scroll compressor according to claim 1, wherein
The second chamber (25) is provided with an oil droplet removing member (27) for removing oil droplets in the fluid flowing out from the muffler chamber (83) through the communication passage (86) of the bearing member (8). Scroll type compressor. The scroll compressor according to claim 3 , wherein
In addition to the first muffler chamber (83) formed in the bearing member (8), the oil droplet removing member (27) partitions the second chamber and passes through the communication passage (86) of the bearing member (8). A scroll compressor provided with a second muffler chamber (87) into which a fluid is introduced.

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