JP3291378B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor for rotating both scrolls in the same direction for compression.

[0002]

2. Description of the Related Art A scroll compressor contains an electric element and a scroll compression element in a closed container. The scroll compression element includes a plurality of driven scrolls and driven scrolls. There is a configuration in which gas is sent into a compression space, and is sent out as high-pressure gas from a compression space whose volume is reduced by rotation of both scrolls.

FIG. 5 and FIG. 6 show a sealed container 1 in which an electric element 2 and a scroll compression element 3 are housed. The scroll compression element 3 includes a driving scroll 4, a driven scroll 5, a main frame 6 supporting the driving scroll 4, an auxiliary frame 7 supporting the driven scroll 5, and a cylindrical ring 8 on the driving scroll 4.
A regulating member 9 which is fixed through the shaft and regulates the movement of the driven scroll in the axial direction, and the Oldham coupling 1 for rotating the driving scroll 4 and the driven scroll 5 in the same direction.
0.

The driving scroll 4 has a spiral wrap 12 provided on the lower surface of a head plate 11 and the head plate 1.
The drive shaft 13 supported by the main frame 6 rises from the upper surface of 1 and is connected to the electric element 2. The driven scroll 5 is provided with a spiral wrap 15 meshing with the wrap 12 on the upper surface of the end plate 14, and a driven shaft 16 eccentric to the drive shaft 13 and supported by the auxiliary frame 7 from the back of the end plate 14. It extends downward.

The engagement between the scrolls 4 and 5 is performed in a hollow chamber 17 formed by a main frame 6 and an auxiliary frame 7. Of the scrolls engaging the wraps 12 and 15, the regulating member 9 disposed on the rear side of the end plate 14 of the driven scroll 5 is fixed to the drive scroll 4 as described above, and the axial direction of the driven scroll 5 is I try to suppress the movement of.

The Oldham coupling 10 is disposed between the end plate 14 and the regulating member 9, and the Oldham coupling 10 allows a plurality of compression spaces 18 formed by engaging the wraps 12 and 15 from outside to inside. The scrolls 4 and 5 are rotated in the same direction while performing compression while gradually reducing the pressure from the low-pressure compression space to the intermediate-pressure compression space, and from the intermediate-pressure compression space to the high-pressure compression space. Let me.

A suction port 1 is provided at a lower side of the closed container 1.
9, a discharge port 20 is disposed on the upper side, and gas (refrigerant) entering from the suction port 19 receives the driven scroll 5.
From the side to the outer compression space 18, and the pressure is increased by the reduction accompanying the shift of the compression space 18 to the center side,
Gas is sent out above the closed container 1 through the driving scroll 4 side, and is discharged from the discharge port 20 to the outside of the container.

As described above, a passage for passing gas is formed in both scrolls 4 and 5. In the drive scroll 4, the discharge passage 21 penetrates through the drive shaft 13 in the longitudinal direction. In the driven scroll 5, the gas passage 22 at the driven shaft 16, the suction lateral hole 23 extending radially from the outer peripheral end of the end plate 14, and the suction lateral hole 23 is opened at the outer peripheral end side of the end plate 14. A suction passage 25 is provided from the suction port 24. Further, an empty chamber 26 is located below the driven shaft 16, and a suction port 19 is connected to the empty chamber 26. As a result, the low-pressure gas passes through the suction port 19, the empty chamber 25 and the suction passage 25. It is supplied to the compression space 18 side.

The compression space 18 formed by the engagement portion of the wrap is reduced while moving toward the center by the rotation of the scroll, so that the outer peripheral portion of the engagement portion is a low-pressure compression space 18a, and the inside thereof is an intermediate pressure. Compression space 18
b, the pressure increases in the center side in the order of the high-pressure compression space 18c. Part of the high-pressure gas sent out from the high-pressure compression space 18c through the discharge passage 21 is partially
The pressure is sent to the hollow chamber 17, and the pressure is used to press the driven scroll 5 against the driving scroll 4.

That is, the high-pressure gas sent into the hollow chamber 17 is guided around the driven shaft 16 through the lower side of the regulating member 9, and is guided around the driven shaft base of the end plate 14 along the outer periphery of the driven shaft 16. I have to. As shown in FIG. 6, around the driven shaft, a seal ring 27 that is in slidable contact with the regulating member 9 is mounted, and high-pressure gas is introduced into a space formed by the partition of the seal ring 27, and the pressure (discharge pressure) ), The driven scroll 5 is pressed toward the driving scroll 4 to secure a seal at the end of the wrap.

[0011]

In an air conditioner or the like having a scroll compressor having the above-described structure, the compression ratio (the ratio between the suction pressure and the discharge pressure) of the scroll compressor is changed by changing the operating conditions of the air conditioning unit. , Compression ratio = discharge pressure / suction pressure) may change significantly. When the compression ratio is reduced, overcompression occurs in the compression space as a feature of the scroll compressor, and the pressure in the space during compression (the space in the region set as the intermediate pressure) becomes extremely high. For this reason, in the scroll compressor having the above-described configuration, the driven scroll is pushed downward by the pressure of the compression space, and the gap in the axial direction is likely to increase apart from the driving scroll. .

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to keep the driven scroll constantly pressed toward the driving scroll, and to prevent performance degradation due to separation from the driving scroll.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and accommodates an electric element and a scroll compression element. The scroll compression element is provided with a spiral wrap on a head plate. A driven scroll having a shaft connected to the electric element, and a driven plate having a shaft eccentric to the center of the shaft of the drive scroll and having a spiral wrap standing on a mirror plate facing and engaged with the drive scroll. A plurality of compression spaces formed by a scroll, a frame that supports the axes of the two scrolls, and a driving scroll and a driven scroll housed in a hollow chamber formed inside the frame are provided from the outside toward the inside. Gradually reduced,
The Oldham coupling, which rotates these scrolls in the same direction so as to perform compression by changing the order of the low-pressure compression space, intermediate-pressure compression space, and high-pressure compression space, and the head plate of the driven scroll fixed to the drive scroll A regulating member disposed on the back side for regulating movement of the driven scroll in the axial direction, and reduces the low-pressure gas sent into the compression space through a suction passage provided in the driven scroll to reduce the compression space. The compressed high pressure gas is sent to a discharge passage provided in a driving scroll, and a part of the high pressure gas sent out from the discharge passage to the hollow chamber of the frame is guided to the rear side of the end plate of the driven scroll. In the scroll compressor that presses the driven scroll toward the driving scroll, the regulating member slides on the rear surface of the end plate of the driven scroll. A closed space is provided between the flat plate and the end plate, and the closed space and the compression space of the intermediate pressure formed by engagement of the lap communicate with each other through a passage penetrating the end plate. It is intended to solve the above-mentioned problem by providing a scroll compressor characterized by the following.

According to another aspect of the present invention, an electric element and a scroll compression element are housed, and the scroll compression element is
A drive scroll having a shaft connected to the electric element by erecting a spiral wrap on the head plate, and a head plate having an axis eccentric to the center of the shaft of the drive scroll and meshing with and facing the drive scroll. A plurality of compression spaces formed by a driven scroll having a vertical wrap, a frame supporting the shafts of the two scrolls, a driving scroll housed in a hollow chamber formed inside the frame, and a driven scroll. Oldham's joint that rotates these scrolls in the same direction so as to perform compression by gradually reducing the pressure from the outside to the inside and changing the compression in the order of low-pressure compression space, intermediate-pressure compression space, and high-pressure compression space And a regulating member fixed to the driving scroll and arranged on the back side of the end plate of the driven scroll to regulate movement of the driven scroll in the axial direction. Then, the low-pressure gas sent into the compression space through the suction passage provided in the driven scroll is compressed by reducing the compression space and sent out to the discharge passage provided in the drive scroll, and the low-pressure gas is discharged from the discharge passage through the suction passage. In a scroll compressor in which a part of the high-pressure gas sent to the hollow chamber is guided to the rear side of the end plate of the driven scroll, and the high-pressure gas in the hollow chamber presses the driven scroll toward the driving scroll, a wrap forming the compression space is provided. In addition to opening the suction opening of the suction passage in the driven scroll of the driven mesh, the closed space is provided around the driven scroll by partitioning the meshed portion from around the driven scroll, and the closed space and the intermediate pressure compression space of the meshed portion are separated from each other. This scroll compressor is characterized by having a passage for communication. Providing a compressor, it is to solve the problems described above.

Still another aspect of the present invention focuses on the point that a differential pressure is generated between the low-pressure compression space inside the meshing portion of the wrap and the sealed space outside the meshing portion in the above invention. To reduce the load on the driven scroll by sending oil that easily accumulates in the compression space inside the wrap engagement portion, and a passage or enclosed space that communicates the enclosed space with the intermediate pressure compression space of the engagement portion. A scroll compressor provided with any one of the passages having a throttling effect that communicates with the hollow chamber, and a passage communicating the low part of the closed space and the low-pressure compression space of the meshing part. To provide.

[0016]

According to the present invention, the gas compressed in the compression space is directly sent to a closed space provided between the driven scroll and the regulating member or to a closed space provided around the driven scroll, and the pressure causes the driven scroll to move. In the first invention, even if overcompression occurs in the meshing portion and a force that pushes the driven scroll downward, a larger force is applied to the driven scroll. This occurs on the back side of the head plate, so that the tip of the wrap of the driven scroll and the head plate of the drive scroll do not separate. According to the second aspect of the invention, the gas is sucked into the meshing portion through the space around the lap meshing portion, but the gas is directly introduced into the meshing portion and compressed into the sealed space around the meshing portion. By guiding the gas at the intermediate pressure in the middle, the driven scroll is pressed against the driving scroll by the high pressure in the space inside the seal ring and the intermediate pressure in the closed space. Since the intermediate pressure compression space of the engagement portion changes in conjunction with the compression ratio, an appropriate pressing force can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. 5 and 6 are denoted by the same reference numerals, and description thereof is omitted.

FIGS. 1 and 2 show a first embodiment, in which gas compressed in a compression space 18 is fed into a closed space 30 formed between a driven scroll 5 and a regulating member 9. 2 shows an embodiment having a configuration as described above. As shown in the drawing, an annular flat plate 28 slidably in contact with the regulating member 9 is mounted around the driven shaft 16 on the back surface of the end plate 14 of the driven scroll 5, and seals disposed on the inner and outer peripheral sides therebetween. A closed space 30 is provided between the rear surface of the end plate 14 and the flat plate 28 by a ring 29. And
The end plate 14 has a passage 31 extending from the compression space 18 (a portion set as an intermediate pressure region) where overcompression occurs at the time of low compression ratio operation to the closed space 30. Through the compression space 18b and the closed space 3
0 communicates.

As described above, since the compression space 18b of the intermediate pressure and the closed space 30 communicate with each other, when over-compression occurs during the low compression operation, gas is introduced into the closed space 30. The pressure in the closed space 30 pushes the driven scroll 5 upward. Note that the area of the closed space 30 is set to be larger than the area of the compression space where overcompression occurs.

FIG. 3 shows a second embodiment in which the pressure in the space formed around the driven scroll 5 is increased, and the pressure applied to the driven scroll 5 and the pressure applied from the rear side of the end plate of the driven scroll 5 are used. Is pressed against the drive scroll.

As shown in the drawing, an upright wall 32 is provided on the outer periphery of the end plate 14 of the driven scroll 5 so as to surround the wrap meshing portion, and slidably comes into contact with the driving scroll 4 so that the wrap meshing portion is in contact with the driving scroll 4. The outer peripheral space of the driven scroll is partitioned by the upright wall 32. Further, the suction port 2 in the suction passage 25 on the driven scroll 5 side.
4 is directly opened to the low compression space 18a, and the outer peripheral space of the driven scroll 5 is a closed space 33.
Reference numeral 34 denotes a stopper plug for closing one opening of the suction side hole 23.

The end plate 14 has a passage 35 extending from the intermediate-pressure compression space 18 b during compression to the side surface of the end plate 14.
Is provided, and the intermediate-pressure compression space 18a communicates with the closed space 33 through the passage 35. Since the sealed space 33 is completely separated from the suction passage 25 and communicates with the intermediate pressure compression space 18a in this manner, the gas is guided from the intermediate pressure compression space so that an intermediate pressure is obtained in the sealed space 33. The driven scroll 5 is pressed against the drive scroll 4 by the high pressure applied to the space inside the seal ring 27 and the intermediate pressure of the closed space 33, and the seal at the tips of the wraps 12, 13 is ensured. Since the pressure in the intermediate pressure compression space 18b is provided so as to change in conjunction with the compression ratio, an appropriate pressing force can be obtained.

FIG. 4 shows a third embodiment. In this embodiment, as in the second embodiment, the upright wall 32 is provided on the end plate 14, and the suction passage 25 is opened on the side of the lap meshing portion, so that the space around the driven scroll 5, that is, Drive scroll 4
And a space surrounded by the cylindrical ring 8 and the regulating member 9 as a closed space 33. And, as in the second embodiment, the passage 35 is provided from the intermediate pressure compression space 18b,
Alternatively, a passage 36 having an aperture effect is provided through the end plate 11 at a position corresponding to the closed space 33 of the end plate 11 of the driving scroll 4.

In this embodiment, the closed space 33 is provided so as to communicate with the intermediate pressure compression space 18b through the passage 35 or with the hollow chamber 17 through the passage 36, and the closed space 33 is higher than the low pressure compression space 18a in the meshing portion. It is an intermediate pressure of the pressure or an intermediate pressure obtained by the throttle effect of the passage 36. Further, at a portion farthest from the position where the suction port 24 is located, a part of the cylindrical
The oil reservoir 37 is provided, and a passage 38 is provided in the drive scroll 4 corresponding to the closed space 33 which is the oil reservoir 37. The passage 38 is open to the closed space 33 as described above, and the other end is provided so as to face the low-pressure compression space 18a of the engagement portion. The oil reservoir 37 and the low-pressure compression space are provided through the passage 38. 18a are provided so as to communicate with each other.
In FIG. 4, reference numeral 34a denotes a stopper plug for closing the through hole formed for forming the passage 38.

As described above, the closed space 33 is higher than the low-pressure compression space 18a, and the lower portion provided as the oil reservoir 37 communicates with the low-pressure compression space 18a. Low compression space 1
8a.

[0026]

According to the present invention, the closed space through which the high-pressure gas flows from the compression space in which the over-compression state occurs is provided on the rear side of the end plate of the driven scroll. Even if over-compression occurs, the driven scroll is pressed against the drive scroll by the high gas pressure in the closed space, so that the sealing performance at the tip of the wrap can be maintained even during low compression ratio operation. In addition, since a closed space into which gas at an intermediate pressure in accordance with the compression ratio is sent from the intermediate pressure compression space in the engagement portion of the wrap is provided around the driven scroll, a high pressure applied to the rear side of the end plate of the driven scroll can be used. The driven scroll is pressed against the driving scroll. Furthermore, the closed space provided around the driven scroll is made higher in pressure than the low-pressure compression space at the engagement portion of the wrap, and a passage for communicating the oil reservoir in this closed space with the low-pressure compression space is provided. Flows from the closed space to the low-pressure compression space, thereby reducing the load applied to the driven scroll that makes a relative oscillating motion.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of a scroll compressor according to the present invention.

FIG. 2 is an explanatory diagram showing a mesh portion of a wrap and a periphery of a driven scroll in the first embodiment.

FIG. 3 is an explanatory diagram showing a second embodiment.

FIG. 4 is an explanatory diagram showing a third embodiment.

FIG. 5 is an explanatory view showing a conventional example.

FIG. 6 is an explanatory diagram showing a mesh portion of a wrap and a periphery of a driven scroll in a conventional example.

[Explanation of symbols]

 4: Drive scroll 5: Driven scroll 8: Cylindrical ring 9: Restriction member 11, 14: End plate 12, 15: Lapping 17: Intermediate chamber 18: Compression space 18a: Low compression space 18b: Intermediate pressure compression space 18c: High pressure compression space 23 ... Suction side hole 24 ... Suction port 25 ... Suction passage 27,29 ... Seal ring 28 ... Plate 30,33 ... Sealed space 31,35,36,38 ... Path 37 ... Oil reservoir

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04C 18/02 311

Claims (3)

(57) [Claims] An electric element and a scroll compression element are housed, and the scroll compression element has a shaft connected to the electric element with a spiral wrap standing on a head plate; A driven scroll having a shaft eccentric with the center of the shaft, and having a spiral wrap erected on a mirror plate facing and engaging with the drive scroll,
A plurality of compression spaces formed by a frame that supports the axes of the scrolls and a driving scroll and a driven scroll housed in a hollow chamber formed inside the frame are gradually reduced inward from the outside. , A low-pressure compression space, an intermediate-pressure compression space, and a high-pressure compression space. And a restricting member disposed on the rear side of the driven scroll to restrict the movement of the driven scroll in the axial direction. The low-pressure gas sent into the compression space through the suction passage provided in the driven scroll, It is compressed by reduction and sent out to a discharge passage provided in the driving scroll, and a part of the height sent out from the discharge passage to the hollow chamber of the frame is reduced. In the scroll compressor, which guides the pressurized gas to the rear side of the head plate of the driven scroll and presses the driven scroll toward the drive scroll side by the high-pressure gas in the hollow chamber, an annular ring that slides on the back surface of the head plate of the driven scroll with the regulating member. A flat plate is attached, a closed space is provided between the flat plate and the end plate, and the closed space and the compression space of the intermediate pressure formed by engagement of the lap communicate with each other through a passage penetrating the end plate. Scroll compressor. A driving scroll having a shaft connected to the motor-driven element, the motor-driven element and a scroll compression element being housed, the scroll compression element being provided with a spiral wrap standing on a head plate; A driven scroll having a shaft eccentric with the center of the shaft, and having a spiral wrap erected on a mirror plate facing and engaging with the drive scroll,
A plurality of compression spaces formed by a frame that supports the axes of the scrolls and a driving scroll and a driven scroll housed in a hollow chamber formed inside the frame are gradually reduced inward from the outside. , A low-pressure compression space, an intermediate-pressure compression space, and a high-pressure compression space. And a restricting member disposed on the rear side of the driven scroll to restrict the movement of the driven scroll in the axial direction. The low-pressure gas sent into the compression space through the suction passage provided in the driven scroll, It is compressed by reduction and sent out to a discharge passage provided in the driving scroll, and a part of the height sent out from the discharge passage to the hollow chamber of the frame is reduced. In a scroll compressor for guiding a pressurized gas to a rear side of a head plate of a driven scroll and pressing the driven scroll toward a driving scroll by the high-pressure gas in the hollow chamber, a suction passage in the driven scroll in which a wrap meshing portion forming the compression space is formed. And opening the suction port, partitioning the meshing portion from around the driven scroll, providing a sealed space around the driven scroll, and providing a passage for communicating the sealed space with the compression space of the intermediate pressure of the meshing portion. Features scroll compressor. 3. A method according to claim 1, wherein one of a passage for communicating the closed space and the intermediate pressure compression space of the meshing portion or a passage having a throttling effect for communicating the closed space with the hollow chamber is provided. 3. The scroll compressor according to claim 2, further comprising a passage communicating between the reservoir and the low-pressure compression space of the engagement portion.