JP3206213B2 - 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 mainly used for a refrigeration system.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor of this type has been known, for example, from Japanese Patent Application Laid-Open No. 4-124485. In this scroll compressor, as shown in FIG. 3, a compression element D composed of fixed and movable scrolls B and C is disposed on one inner side of a closed casing A, and And a motor F including a stator F1 and a rotor F2 is disposed on a side of the first bearing housing E opposite to the compression element D, and a rotor of the motor F is provided. One end of the drive shaft G extending from F2 in the axial direction is supported by a bearing cylinder E1 provided in the first bearing housing E, and the bearing end of the drive shaft G is connected to the movable scroll C in an interlocking manner. With the rotation of the drive shaft G, the orbiting scroll C is revolved with respect to the fixed scroll B via a rotation preventing mechanism such as an Oldham ring. Previous Is an end face facing the bushing E1, is provided with a semi-circular balance weight G1 which is larger in diameter than the end surface of the bushing E1. Further, a suction space H for sucking a low-pressure gas refrigerant is provided between the motor F and the first bearing housing E inside the closed casing A.
Is formed, and a suction pipe I is opened in the suction space H, and a partition J is provided on the fixed scroll B side of the compression element D, and between the partition J and the inner wall of the casing A. , Forming a discharge space K in a partitioned manner with the suction space H,
A discharge port and a discharge pipe L provided in the fixed scroll B are opened in the discharge space K. Further, the casing A
A second bearing housing N that supports the drive shaft G and communicates with the suction space H through an air gap or the like of the motor F with an anti-compression element side of the motor F inside. A space M is provided so that both ends of the drive shaft G in the length direction are supported by the second bearing housing N and the bearing cylinder E1 of the first bearing housing E, respectively.

[0003] Then, by rotating the movable scroll C with respect to the fixed scroll B with the rotation of the drive shaft G, a gas fluid is introduced from the suction pipe I into the suction space H, and the gas fluid is discharged. Each scroll B, C
The compressed gas fluid is sucked into the compression chamber, compressed, discharged into the discharge space K, and discharged from the discharge space K to the outside via the discharge pipe L.

[0004]

In the above construction, the drive shaft G is connected to the bearing housings E,
N, the bearing is supported in the radial direction. However, since no thrust bearing is provided, the support in the thrust direction is not sufficient. When the shaft G moves in the axial direction, the semi-circular balance weight G1 provided on the drive shaft G collides with the end face of the bearing cylinder E1 provided on the first bearing housing E in a partially hitting state. Occurs. For this reason, there has been a problem that the end face of the bearing cylinder E1 is abnormally worn and reliability is impaired.

That is, since the drive shaft G can move in a slight range in the axial direction as described above, the drive shaft G can be transported vertically or horizontally when the scroll compressor is transported. The drive shaft G moves back and forth in the axial direction due to vibrations during transportation, and the movement causes the balance weight G1 to partially contact the end face of the bearing cylinder E1 in a one-sided state. The impact was concentrated and as a result, the impacted end face could be abnormally worn or damaged.

Further, when the scroll compressor in the refrigerating apparatus is used as a horizontal compressor in particular, a low-pressure gas refrigerant is introduced into the suction space H from the suction pipe I and the suction gas is provided near the compression element D. Open tube I,
Since the low-pressure gas refrigerant introduced into the suction space H from the suction pipe I is quickly sucked into the compression element D side, during operation, the inside of the suction space H and the suction space H The inside of the anti-compression element side space M which is communicated via an air gap or the like of the motor F is maintained at a low pressure, and when the operation is stopped, on the other hand, by equalizing the pressure of the gas refrigerant circulating in the refrigeration system, It is maintained at a higher pressure than during operation. Thus, when the operation is restarted after the operation is stopped, the low-pressure gas refrigerant introduced into the suction space H is quickly sucked into the compression element D side, so that the internal pressure of the suction space H immediately decreases. On the side of the non-compression element side space M, the motor F is interposed between the non-compression element side space M and the suction space H, and the gas refrigerant passes through an air gap or the like communicating the spaces H and M. Receives a large flow resistance, and the anti-compression element side space M is disposed at a position distant from the compression element D. At the time of startup, despite the fact that the pressure of the suction space H is low, a state in which the space M on the anti-compression element side is high with respect to the suction space H occurs, and When the pressure is By acting as a back pressure on the child F2, the drive shaft G moves to the compression element D side, and the balance weight G1 is locally attached to the end face of the bearing cylinder E1 in the same manner as in the case of transportation described above. The contact in a one-sided contact state may cause abnormal wear or damage of the end surface of the bearing cylinder E1.

An object of the present invention is to provide a bearing housing in which the end surface of a bearing cylinder is brought into contact with a balance weight by means of a balance weight even when the drive shaft moves back and forth in the axial direction during transportation or operation start-up. An object of the present invention is to provide a scroll compressor capable of preventing abnormal wear and damage due to the above and improving reliability.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a pair of scrolls 2 and 3 are provided.
, A motor 6 having a drive shaft 7 for driving the compression element 4, and a bearing housing 5 having a bearing cylinder 51 for supporting the drive shaft 7 on the compression element 4 side.
In the scroll compressor in which the drive shaft 7 is provided with a balance weight 71 facing the end face of the bearing cylinder 51, an outer diameter equal to or more than the outer diameter of the end face of the bearing cylinder 51 is provided on the bearing cylinder 51 side of the balance weight 71. In addition, a flange portion 73 having an annular facing surface 72 facing the end surface of the bearing cylinder 51 is provided.

According to the second aspect of the present invention, the flange portion 73 is disposed close to the end surface of the bearing cylinder 51 in the bearing housing 5.

Further, according to the third aspect of the present invention, the flange portion 73 is a coil end 61 of the motor stator 61.
a having an outer diameter close to the inner peripheral portion of the coil end 6.
A closed space 61b is formed in the inner peripheral portion of 1a.

[0011]

According to the first aspect of the present invention, even if the drive shaft 7 moves back and forth in the axial direction during transportation or operation start-up, the bearing cylinder 51 side of the balance weight 71 remains.
A flange 73 having an outer diameter equal to or larger than the outer diameter of the end surface of the bearing cylinder 51 and having an annular facing surface 72 facing the end surface of the bearing cylinder 51 is provided.
And the impact due to the collision is received while dispersing the force over the entire end surface of the bearing cylinder 51. Therefore, the balance weight 71
Abnormal wear and damage caused by the impact on the end face of the bearing cylinder 51 can be prevented, and the reliability of the scroll compressor can be improved.

According to the second aspect of the present invention, since the flange portion 73 is disposed close to the end surface of the bearing cylinder 51 in the bearing housing 5, when the flange portion 73 contacts the bearing cylinder 51, While the flange 73 can prevent abnormal wear and damage of the end surface of the bearing cylinder 51, and furthermore, the flange 73 provided close to the bearing cylinder 51 enables
Since the amount of lubricating oil flowing between the drive shaft 7 and the bearing cylinder 51 flowing out from the end face of the bearing cylinder 51 can be reduced, the lubrication of each lubricating portion in the compression element 4 can be sufficiently performed by this sealing effect. Can be done.

Further, according to the third aspect of the present invention, the flange 73 is connected to the coil end 61a of the motor stator 61.
Of the coil end 61
Since the closed space 61b is formed in the inner peripheral portion of a, when the flange 73 comes into contact with the bearing cylinder 51, the flange 73 can prevent abnormal wear and damage of the end face of the bearing cylinder 51, The coil end 61 formed by the flange 73
Since the balance weight 71 can be arranged in the closed space 61b of a, the lubricating oil stored in the bottom oil sump of the closed casing is agitated by the balance weight 71 particularly when the scroll compressor is of a horizontal type. Can be prevented.

[0014]

FIG. 1 shows a low-pressure dome type horizontal scroll compressor used in a refrigerating apparatus. A horizontal casing 1 having an oil reservoir 1a at an inner bottom thereof has a pair of fixed scrolls 2 on one side in the horizontal direction. And a movable scroll 3, a first bearing housing 5 is provided on the movable scroll 3 side of the compressed element 4, and the casing 1
A motor 6 including a stator 61 and a rotor 62 is disposed on the side of the first bearing housing 5 opposite to the compression element in the inside.
A bearing cylinder 51 provided on the first bearing housing 5 with a compression element side end of a drive shaft 7 extending from a rotor 62 of the motor 6.
On the other hand, the front end of the drive shaft 7 on the bearing side is inserted into a boss portion 30 provided at the center of the back of the movable scroll 3, and the movable scroll 3 is fixedly scrolled with the rotation of the drive shaft 7. 2 is driven to revolve through a rotation prevention mechanism such as an Oldham ring,
In addition, an intermediate portion in the longitudinal direction of the drive shaft 7 located between the first bearing housing 5 and the rotor 62 is opposed to an end face of a bearing cylinder 51 in the first bearing housing 5, A semicircular balance weight 71 having a larger diameter than the end surface of the cylinder 51 is provided integrally.

[0015] Further, the first
A suction space 8 is formed between the bearing housing 5 and the motor 6, a suction pipe 9 is opened in the suction space 8, and a partition 10 is provided on the opposite side of the fixed scroll 2 from the motor.
And a discharge space 11 is formed between the partition body 10 and the inner wall of the casing 1 so as to be partitioned from the suction space 8. The discharge space 20 is provided in the fixed scroll 2 in the discharge space 11. The discharge pipe 12 is opened. Further, a stator 6 of the motor 6 is provided on the side of the motor 6 opposite to the compression element.
An anti-compression element side space 13 in which a second bearing housing 14 that communicates with the suction space 8 and supports the drive shaft 7 is provided through an air gap or the like formed between the rotor 1 and the rotor 62; The second bearing housing 14 and the first
The bearing cylinder 51 of the bearing housing 5 supports the drive shaft 7 on both sides in the length direction of the drive shaft 7.

Then, the orbiting scroll 2 is revolved with respect to the fixed scroll 3 with the rotation of the drive shaft 7 to introduce a low-pressure gas refrigerant from the suction pipe 9 into the suction space 8. Is sucked into the compression chamber between the scrolls 2 and 3 and compressed, and the compressed gas refrigerant is discharged into the discharge space 11 and discharged from the discharge space 11 to the outside via the discharge pipe 12. It is.

Further, in the scroll compressor described above, the second bearing housing 14 supporting the motor-side end of the drive shaft 7 is provided with an oil pumping device 15 interlocked with the drive shaft 7. The pump device 15 is connected to the drive shaft 7.
The lubricating oil in the oil reservoir 1a is supplied with the oil supply passage 70 provided inside the shaft center of the drive shaft 7 by operating the oil supply passage 70 along with the rotation of
And a bearing 52 between the drive shaft 7 and the bearing cylinder 51 from the oil supply passage 70 via a plurality of branch oil passages 70a.
Further, oil is supplied to a bearing 53 and the like interposed between the distal end portion of the drive shaft 7 on the compression element side and the boss portion 30 of the movable scroll 3. 2, a small hole 52a is formed in a part of the bearing 52 interposed between the drive shaft 7 and the bearing cylinder 51, and the small hole 52a is formed.
A part of the lubricating oil supplied to the bearing 52 through the oil passage 54 is formed between the movable scroll 3 of the compression element 4 and the first bearing housing 5 through an oil passage 54 formed in the first bearing housing 5. Oil is supplied to the thrust bearing.

In the above structure, as is apparent from FIG.
A flange 73 having an outer diameter equal to or greater than the outer diameter of the end surface of the bearing cylinder 51 and having an annular facing surface 72 facing the end surface of the bearing cylinder 51 is provided on the opposite side of the bearing weight 51 to the balance weight. It was formed integrally with 71. That is, the balance weight 71 is formed in a semicircular arc shape having a diameter larger than that of the bearing cylinder 51, and the balance weight 71 is provided on the surface of the balance weight 71 facing the bearing cylinder 51.
The semi-circular thin plate portion 7 having a diameter larger than the outer diameter of the end face and having substantially the same outer diameter as the balance weight 71.
3a is continuously formed around the entire outer periphery of the balance weight 71, and is formed integrally with the surface of the balance weight 71 facing the bearing cylinder 51 so as to be flush with the end face of the balance weight 71 and the thin plate portion. 73a, the flange 73 having the annular facing surface 72 is formed.

In this case, when the scroll compressor is transported, the drive shaft 7 moves back and forth in the axial direction due to vibration or the like, and the balance weight 71 is moved to the end face of the bearing cylinder 51 provided in the first bearing housing 5. Contact with the bearing weight 51 of the balance weight 71
The annular opposed surface 72 of the flange portion 73 formed flush with the opposed surface to the thin plate portion 73a comes into uniform contact with the entire end surface of the bearing cylinder 51. Can be received by the entire end surface of the bearing cylinder 51, so that the balance weight 7 can be received.
1 can be prevented from being partially concentrated, as in the case where the impact due to No. 1 is received by a part of the end face of the bushing 51, and the impact can be dispersed over the entire end face. The end face of the bearing cylinder 51 can be prevented from being abnormally worn or damaged due to a partially concentrated impact, and the reliability of the scroll compressor can be improved.

When the above-described scroll compressor is restarted after the operation is stopped, the space 13 opposite to the compression element 4 is disposed at a position distant from the compression element 4 and when the scroll compressor passes through an air gap or the like. Due to high distribution resistance,
The low pressure of the anti-compression element side space 13 with respect to the suction space 8 slows down, and the pressure difference between the suction space 8 and the anti-compression element side space 13 causes the drive shaft 7 to move the compression element 4. Even when moving to the side, the annular opposing surface 72 of the flange portion 73 formed integrally with the balance weight 71 is brought into uniform contact with the entire end surface of the bearing cylinder 51 in the same manner as in the case of the transportation described above. Thereby, the impact of the flange portion 73 can be received while dispersing the force over the entire end surface of the bearing cylinder 51, and the end surface of the bearing cylinder 51 is prevented from being abnormally worn or damaged due to one-side contact. it can.

Further, the flange portion 73 formed integrally with the balance weight 71 may be formed integrally with the end face of the bearing cylinder 51 as shown in FIG.

In this case, when the flange 73 comes into contact with the bearing cylinder 51, the flange 73
The lubricating oil pumped from the bottom oil reservoir 1a of the closed casing 1 to the oil supply passage 70 in the drive shaft 7 while preventing abnormal wear and damage of the end face from the branch oil passage 70a. Oil is supplied to a bearing 52 interposed between the drive shaft 7 and the bearing cylinder 51, a bearing 53 between a tip end of the drive shaft 7 and the boss 30 of the movable scroll 3, and the like. A part of the lubricating oil supplied to the bearing 52 is supplied from the oil passage 54 to a thrust bearing portion of the movable scroll 3 and the first bearing housing 5 through a small hole 52a provided in the bearing 52. In this case, by providing the flange portion 73 close to the bearing cylinder 51, the clearance between the flange portion 73 and the bearing cylinder 51 is reduced, and the lubricating oil flows out from the end face of the bearing cylinder 51 to the outside. The amount can be reduced Therefore, as the amount of the lubricating oil flowing out decreases, the lubrication of the bearings can be sufficiently performed, and the lubrication between the scrolls 2 and 3 can be sufficiently performed. The sealing property between the scrolls 2 and 3 can also be improved.

Further, as shown in the second embodiment of FIG. 2, the flange 73 has a larger diameter than the surface of the first bearing housing 5 opposed to the bearing cylinder 51, and the motor 6
Formed in a disk shape having an outer diameter close to the inner peripheral portion of the coil end 61a provided on the stator 61 of the stator 61.
3 is the bearing cylinder 5 in the balance weight 71.
By disposing the drive shaft 7 integrally with the coil end 61a on the opposite side to the inner periphery of the coil end 61a,
A closed space 61b may be provided on the inner peripheral side of the coil end 61a, and the balance weight 71 may be provided inside the closed space 61b.

In this case, when the flange portion 73 comes into contact with the bearing cylinder 51, the flange portion 73 can prevent abnormal wear and damage of the end surface of the bearing cylinder 51, and at the same time, move the scroll compressor sideways. In the case of the type, the balance weight 71 stirs the lubricating oil stored in the bottom oil reservoir 1a of the casing 1 to prevent the lubricating oil from being formed and being mixed into the gas refrigerant. Oil rise can be reduced.

In the above-described embodiment, a horizontal low-pressure dome type scroll compressor is shown. However, the present invention is not limited to the same type, and is applicable to, for example, a vertical or high-pressure dome type scroll compressor. Of course, you can.

[0026]

As described above, according to the first aspect of the present invention, the compression element 4 having the pair of scrolls 2 and 3 is provided.
And a motor 6 having a drive shaft 7 for driving the compression element 4
And a bearing cylinder 51 for supporting the compression element 4 side of the drive shaft 7
A first bearing housing 5 having a drive shaft 7
The balance weight 7 facing the end face of the bearing cylinder 51
In the scroll compressor provided with No. 1, an annular facing surface 72 having an outer diameter equal to or greater than the outer diameter of the end surface of the bearing cylinder 51 and facing the end surface of the bearing cylinder 51 is provided on the bearing cylinder 51 side of the balance weight 71. Since the flange portion 73 is provided, the drive shaft 7 moves in the axial direction at the time of transportation or operation start, and the balance weight 71 collides with the end surface of the bearing cylinder 51 provided on the first bearing housing 5. However, the impact of the balance weight 71 at the time of collision may be applied to the bearing cylinder 51 via the annular opposed surface 72 of the flange 73.
Can be received while dispersing the force over the entire end face of the scroll compressor. Therefore, abnormal wear and damage caused by partially colliding with the end face of the bearing cylinder 51 can be prevented, and the scroll compressor can be prevented. Reliability can be improved.

According to the second aspect of the present invention, the flange portion 73 is provided on the bearing cylinder 5 of the first bearing housing 5.
1, the flange 73 can prevent abnormal wear and damage of the end face of the bearing cylinder 51 at the time of contact of the flange 73 with the bearing cylinder 51. The flange portion 73 provided close to the bearing cylinder 51
Thus, the amount of lubricating oil flowing between the drive shaft 7 and the bearing cylinder 51 flowing out from the end surface of the bearing cylinder 51 can be reduced. Lubrication at the lubricating point can be sufficiently performed.

Furthermore, according to the third aspect of the present invention, the flange 73 is connected to the coil end 6 of the motor stator 61.
The outer diameter is close to the inner circumference of the coil end 61a, and a closed space 61b is formed in the inner circumference of the coil end 61a. Thus, the balance weight 71 can be arranged in the closed space 61b of the coil end 61a formed by the flange 73 while preventing abnormal wear and damage of the end surface of the bearing cylinder 51. In particular, when the scroll compressor is of a horizontal type, the balance weight 71 is prevented from stirring the lubricating oil stored in the oil reservoir at the bottom of the closed casing, and the lubricating oil forms and mixes with the gas refrigerant. It is possible to prevent oil from rising.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a horizontal scroll compressor shown as one embodiment of the present invention.

FIG. 2 is an enlarged partial sectional view showing a second embodiment.

FIG. 3 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 2, 3 scroll 4 compression element 5 bearing housing 51 bearing cylinder 6 motor 61 stator 61a coil end 61b closed space 7 drive shaft 71 balance weight 72 annular facing surface 73 flange

Continued on the front page (72) Inventor Masanori Yanagisawa 3-12 Chikko Shinmachi, Sakai City, Osaka Prefecture Daikin Industries, Ltd. Sakai Factory Rinkai Plant (72) Inventor Ken Takigawa 3-12 Chiku Shinmachi, Sakai City, Osaka Daikin (58) Investigated field (Int. Cl. ⁷ , DB name) F04C 18/02 311 F04C 23/02 F04C 29/00

Claims (3)

(57) [Claims] A motor (6) having a compression element (4) having a pair of scrolls (2) and (3), a drive shaft (7) for driving the compression element (4), and the drive shaft (7). And a bearing housing (5) having a bearing cylinder (51) for supporting the compression element (4) side of the drive shaft (7), and the drive shaft (7) has a balance weight (71) opposed to an end face of the bearing cylinder (51). )
In the scroll compressor provided with the bearing cylinder (51), the bearing weight (71) has an outer diameter equal to or greater than the end face outer diameter of the bearing cylinder (51) on the bearing cylinder (51) side.
A scroll compressor comprising a flange (73) having an annular facing surface (72) facing the end surface of 1). 2. The scroll compressor according to claim 1, wherein the flange (73) is arranged close to an end surface of the bearing cylinder (51) in the bearing housing (5). 3. The motor stator (61), wherein the flange (73) is provided.
The scroll compressor according to claim 1, wherein the scroll compressor has an outer diameter close to the inner periphery of the coil end (61a), and a closed space (61b) is formed in the inner periphery of the coil end (61a).