JP3003365B2 - Horizontal open 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 horizontal open compressor mainly used for a refrigeration system.

[0002]

2. Description of the Related Art Conventionally, a horizontal open compressor in which a drive shaft for driving a compression element is arranged in a lateral direction and this drive shaft is driven by an external drive source is disclosed in Japanese Utility Model Publication No. 3-547. Have been. In this conventional compressor, as shown in FIG. 8, a scroll type compression element B is provided in a horizontal casing A having one end closed and the other end open, and a drive shaft for driving the compression element B is provided. One end of C is projected outward from an opening D of the casing A, and a closing body F provided with a bearing tube E is attached to the outside of the opening D of the casing A, so that the outer periphery of the bearing tube E The drive wheel H is rotatably supported via a grease-enclosed type ball bearing G, and
An electromagnetic clutch L having a magnet J and a clutch disk K is provided between the outwardly projecting shaft portion I of the drive shaft C and the drive wheel H, and the electromagnetic clutch L is disengaged. , The operation of the compressor can be stopped without stopping the drive of the external drive source such as the engine,
A fixed ring N of a mechanical seal M is attached to the inner periphery of the protruding base of the bearing cylinder E to seal the opening D.

[0003]

However, according to the conventional compressor, the electromagnetic clutch L is engaged to rotate the drive shaft C and the drive wheel H together, thereby obtaining the compression element B.
When the ball bearing G is operated, the inner cylinder and the outer cylinder of the ball bearing G rotate relative to each other, so that the grease sealed in the ball bearing G is stirred, and the stirring heat is generated.
Not only frictional heat is generated between the inner cylinder and the outer cylinder, but also by the rotation of the drive shaft C, the mechanical seal M
The relative rotation also occurs between the stationary ring N and the rotating ring, and the relative rotation generates heat in the stationary ring N to raise the temperature of the stationary ring N to, for example, about 100 ° C. Heat generated in the ring N is transmitted to the ball bearing G via the bearing sleeve E. Therefore, the temperature of the ball bearing G increases to, for example, about 120 ° C. due to the stirring heat, the friction heat, and the heat transfer from the stationary ring N. As a result, the grease of the ball bearing G deteriorates in a short time, and the durability of the ball bearing G is poor.

[0004] The present invention has been made in view of the above points,
The purpose is to be able to suppress the heat generated by the mechanical seal from being transferred to the bearing that supports the drive wheels, and to form a flow of air around the bearing so that the bearing can be cooled. is there.

[0005]

A compression element 2 is provided on one side of a horizontal casing 1 and a drive shaft 3 for driving the compression element 2 is projected outward from an opening on the other side of the casing 1. On the other hand, a closing body 5 having a bushing 7 projecting from the casing 1 is attached to an opening of the casing 1, and a driving wheel 8 is rotatably supported on an outer peripheral portion of the bushing 7 via a bearing 10. In a horizontal open compressor in which an electromagnetic clutch 9 is provided between an outwardly protruding shaft portion 3a of the shaft 3 and the driving wheel 8, and a fixed ring 61 of a mechanical seal 6 is attached to an inner portion of the closing body 5. At the protruding base of the bearing cylinder 7, a communication hole 11 is provided axially inward of the supporting portion of the bearing 10 so as to communicate the outer peripheral portion of the bearing cylinder 7 with the outer peripheral portion of the protruding shaft portion 3 a. It is.

[0006] The drive wheel 8 is provided with the bearing cylinder 7.
May be provided with a fan blade 18 for forcibly transferring the air at the inner periphery to the outer periphery.

The clutch disk 92 of the electromagnetic clutch 9 extends radially outward from the shaft end of the drive shaft 3.
It is preferable to provide an outside air inlet 19 that communicates with the inner peripheral portion of the bearing sleeve 7 at the base of the flange 94 that supports the outside.

[0008]

The bearing sleeve supports the driving wheel via the bearing.
A communication hole 11 is provided at an inner side in the axial direction from a support portion of the bearing 10 at the protruding base portion, so that an outer peripheral portion of the bearing cylinder 7 communicates with an outer peripheral portion of the protruding shaft portion 3a. 8
The air in the outer circumferential gap of the bearing cylinder 7 is centrifugally discharged by the rotation of the bearing cylinder 7 and is discharged to the outside. With this, the outside air is attracted to the inner circumferential gap of the bearing cylinder 7 and the inner circumferential gap of the The bearing 10 can be cooled by the flow of air, and the communication hole 11 is located axially inward of the supporting portion of the bearing 10. Since it is provided on the side, the heat transfer area while the heat generated in the mechanical seal 6 is transferred to the bearing 10 can be reduced.
Therefore, the amount of heat transfer from the bearing 10 can be reduced, and the temperature rise of the bearing 10 due to the heat transfer can be suppressed. As a result, the durability of the bearing 10 can be increased as a whole.

Further, the fan blade 1 forcibly transferring the air at the inner peripheral portion of the bearing cylinder 7 to the outer peripheral portion to the drive wheel 8.
The provision of 8 can promote the flow of air in the inner circumferential gap and the outer circumferential gap of the bearing cylinder 7, so that the temperature rise of the bearing 10 can be further suppressed.

An outside air inlet 19 extending radially outward from the shaft end of the drive shaft 3 and supporting a clutch disk 92 of the electromagnetic clutch 9 at the base of a flange 94 communicating with the inner periphery of the bearing cylinder 7. Is provided, the outside air can be easily taken into the clearance on the inner peripheral side of the bearing cylinder 7, and the flow of the taken outside air can be improved. Therefore, the cooling effect of the bearing can be enhanced while the structure is simple. is there.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The compressor shown in FIG. 5 is a horizontal open compressor used in a refrigerating apparatus, and has a fixed scroll 2 in a horizontal casing 1 having one end closed and an open port 1a at the other end.
1, a compression element 2 having a movable scroll 22 and a drive shaft 3 for driving the movable scroll 22 of the compression element 2.
A frame 4 for rotatably supporting one end of the drive shaft 3 is provided therein, and the other end of the drive shaft 3 is projected outward from an opening 1 a of the casing 1 while an opening of the casing 1 is opened. The closure 5 is attached to 1a.

The closing body 5 has a through hole 51 through which the protruding shaft portion 3 a of the drive shaft 3 is inserted, and a through hole 51.
An annular shape having a larger diameter recessed portion 52 is formed. The fixed ring 61 of the mechanical seal 6 is held in the recessed portion 52, and the outer surface of the closing body 5 is formed in an axial direction from around the through hole 51. An outwardly protruding bearing sleeve 7 is provided integrally.

[0013] A bearing fitting portion 71 having a small diameter is provided on the outer periphery of the distal end side of the bearing cylinder 7 leaving a base portion through a step portion. The bearing fitting portion 71 has two grease-enclosed balls. An annular drive wheel 8 is rotatably supported via a bearing 10.

The driving wheel 8 is provided with an annular bore 81 which opens toward the inner surface on the side of the closing body 5, and a ring-shaped magnet 91 of the electromagnetic clutch 9 is provided inside the bore 81. I have.

The electromagnetic clutch 9 includes the magnet 9
1, a ring-shaped clutch disk 92 facing the outer surface of the drive wheel 8, and a flange 94 at the outer end.
A cylindrical hub 9 fitted to the protruding shaft portion 3a so as to be relatively non-rotatable;
3, a plurality of leaf springs 95 for urging and supporting the clutch disc 92 on the flange 94 of the hub 93 in a direction away from the magnet 91, and a ring-shaped cover for covering the outside of the leaf spring 95. And a cover 96. The magnet 91 is mounted on the outer surface of the closing body 5 via a ring-shaped mounting plate 97.
When the clutch disc 92 is actuated toward the magnet 91 against the leaf spring 95 by energizing the magnet 1, the clutch disc 92 is brought into pressure contact with the outer surface of the drive wheel 8.
When the power supply to the clutch wheel 92 is stopped, the clutch disk 92 is separated from the drive wheel 8 by the force of the leaf spring 95.

The magnet 91 and the cavity 8
1 and between the inner surface of the drive wheel 8 and the mounting plate 97, there are a first gap K1 and a second gap K2 for rotating the drive wheel 8 with respect to the magnet 91, A third gap K3 for rotating the hub 93 with respect to the bearing cylinder 7 is provided between the inner peripheral surface of the bearing cylinder 7 and the outer peripheral surface of the hub 93.
There is also a fourth gap K4 between the inner peripheral surface of the second and the outer peripheral surface of the flange 94 for operating the clutch disc 92 in the axial direction with respect to the flange 94.
Communicates with the outside from the space between the leaf springs 95 via the outer peripheral side and the inner peripheral side of the cover 96.

Thus, in the compressor constructed as described above, the present invention relates to a compressor as shown in FIG. A plurality of communication holes 11 penetrating in the radial direction are provided at predetermined intervals in the circumferential direction, and the second gap K2 in the outer peripheral portion of the bearing cylinder 7 is formed by the communication holes 11 in the third region of the outer peripheral portion of the hub 93. The heat transfer area is reduced while the heat generated in the mechanical seal 6 is transferred to the ball bearing 10 while communicating with the gap K3.

The communication hole 11 is formed in a long hole shape extending in the circumferential direction as shown in FIGS.
Although not shown, it may be formed in a round hole shape. The number and size of the communication holes 11 are determined within a range where the strength of the bearing sleeve 7 is not insufficient, and may be one.

It is preferable that an annular recess 72 is provided on the inner peripheral surface of the base of the bearing cylinder 7 as shown in FIG. 1 to reduce the thickness. The heat transfer area during heat transfer to the ball bearing 10 can be further reduced.

In FIG. 5, reference numeral 62 denotes a rotating ring of the mechanical seal 6, which is held on the drive shaft 3 via a rubber bellows 63. 12 is provided between the movable scroll 22 of the compression element 2 and the drive shaft 3 so that the movable scroll 22
A drive unit 13 for eccentric rotation of the casing 1
A suction pipe for introducing a refrigerant gas into the compression element 2;
A discharge pipe for taking out the high-pressure gas discharged from the projecting port 23 to the high-pressure chamber 15 to the outside.
Is an oil pump for pumping lubricating oil from the bottom oil reservoir 17 and supplying it to the bearings of the drive shaft 3 and the like.

In the compressor constructed as described above, a drive belt (not shown) such as a V-belt is provided between a pulley interlocking with an external drive source such as an engine and the drive wheel 8 so as to hang the drive wheel. 8 is driven at 1100 to 4000 rpm.

Then, in the state shown in FIG.
When the magnet 91 is energized, the clutch disk 92 is attracted to the magnet 91 side and pressed against the outer surface of the drive wheel 8.
The transmission is transmitted to the drive shaft 3 via a leaf spring 95 and a hub 93 having a flange 94, and the movable scroll 22 of the compression element 2 is driven with the rotation of the drive shaft 3. In the mechanical seal 6, the rotating ring 62 held by the drive shaft 3 rotates with respect to the fixed ring 61, thereby preventing fluid such as gas from leaking from around the drive shaft 3 to the outside.

During the operation of the compressor as described above, the inner cylinder and the outer cylinder of the ball bearing 10 rotate relative to each other, so that the grease sealed in the ball bearing 10 is agitated as the operation continues. , With the heat of stirring,
Friction heat is generated between the inner cylinder and the outer cylinder of the ball bearing 10, and the driving shaft 3 rotates during operation, so that the fixed ring 61 and the rotating ring 62 of the mechanical seal 6 rotate relatively. Heat is generated by the relative rotation, the temperature of the fixed ring L rises to, for example, about 100 ° C., and the ball bearing 10
Heat will be transferred to it. Where the bearing sleeve 7
A communication hole 11 is provided axially inward from the support portion of the ball bearing 10 at the projecting base of the ball bearing 10, and a heat transfer area during the heat generated by the mechanical seal 6 is transferred to the ball bearing 10. Since it is made smaller, the amount of heat transferred from the mechanical seal 6 to the ball bearing 10 from the bearing sleeve 7 can be reduced, and the temperature rise of the ball bearing 10 can be suppressed accordingly.

The communication hole 11 has a second gap K2 on the outer peripheral portion of the bearing sleeve 7 and a third gap K3 on the outer peripheral portion of the protruding shaft portion 3a.
The first gap K1 is communicated with the gap K3.
To the second gap K2, the communication hole 11, and the third gap K3.
, The fourth gap K4, the space between the leaf springs 95, and the cover 96.
Can be communicated with the outside through the outer peripheral side and the inner peripheral side space.

On the other hand, the rotation of the drive wheel 8 causes the air in the radial space K1a of the first gap K1 and the air in the second gap K2 to undergo a centrifugal action, so that the radial space K1a
Of the first space K1 is the axial space K on the outer peripheral side in the first gap K1.
1b to the outside of the driving wheel, and the second clearance K
2 is discharged to the axial space K1c on the inner peripheral side in the first gap K1, and as a result, the air in the third gap K3 is drawn from the communication hole 11 to the second gap K2, By this attraction, outside air is introduced into the third gap K3 from the outer peripheral side and inner peripheral side space of the cover 96 through the space between the leaf springs 95 and the fourth gap K4, and between the first to fourth gaps, That is, an air flow can be generated around the ball bearing 10, and the air flow causes the ball bearing 10 to flow through the bearing cylinder 7 and the inner cylindrical portion 82 of the drive wheel 8.
Can be cooled, and the temperature rise of the ball bearing 10 can be further suppressed. Note that, by cooling the ball bearing 10 and suppressing heat transfer from the mechanical seal 6, the temperature of the ball bearing 10 is reduced by 30 to 50 ° C. compared to a case where the notched hole 11 is not provided. I was able to do it.

In the embodiment described above, the communication hole 11 is provided in the bearing sleeve 7 so that air can flow by the centrifugal action due to the rotation of the drive wheel 8.
The fan blades 18 are provided on the inner surface of the inner cavity 81 of the driving wheel 8 to forcibly discharge the air in the first gap K1 as shown in FIG. It may be configured to be forcibly transferred to one gap K1 and discharged to the outside. With this configuration, the first
Since the air between the fourth gap and the fourth gap can be forcibly discharged and the flow of the air can be accelerated, the temperature rise of the ball bearing 10 can be further suppressed.

In the above embodiment, the cover 96
The outside air is taken into the third gap K3 from the space between the outer peripheral side and the inner peripheral side space and the leaf spring 95 and the fourth gap K4, but in addition, as shown in FIG. One or a plurality of outside air inlets 19 may be provided which communicate with a third gap K3 provided between the inner peripheral surface of the bearing cylinder 7 and the outer peripheral surface of the hub 93. With this configuration, outside air can be easily taken into the third gap K3, and the flow of the taken outside air can be improved.

The compressor of the present invention may be a compressor having a scroll type compression element or a compressor having a rotary type compression element.

[0029]

As described above, according to the present invention, the compression element 2 is mounted on one side of the horizontal casing 1 and the drive shaft 3 for driving the compression element 2 is moved outward from the other opening of the casing 1. On the other hand, a closing body 5 provided with a bushing 7 is attached to the opening of the casing 1 to rotatably support the driving wheel 8 on the outer periphery of the bushing 7 via a bearing 10. An electromagnetic clutch 9 is provided between the driving wheel 8 and the protruding shaft portion 3a protruding outward from the driving shaft 3;
In the horizontal open compressor in which the fixed ring 61 of the mechanical seal 6 is attached to the inner part of
A communication hole 11 is provided on the inner side in the axial direction from the support portion of the bearing 10 so as to allow the outer peripheral portion of the bearing cylinder 7 to communicate with the outer peripheral portion of the protruding shaft portion 3a. The air on the outer peripheral side of the bearing tube 7 is discharged to the outside by the centrifugal action, whereby outside air is attracted to the inner peripheral side of the bearing tube 7, and an air flow is generated between the inner peripheral side and the outer peripheral side of the bearing tube 7. Therefore, the bearing 10 can be cooled by the flow of air, and the communication hole 11 can be cooled.
Is provided on the inner side in the axial direction from the support portion of the bearing 10, the heat transfer area until the heat generated by the mechanical seal 6 is transferred to the bearing 10 can be reduced, and the bearing by the mechanical seal 6 can be reduced. The temperature rise of the bearing 10 can be suppressed, the life of the grease of the bearing 10 can be extended as a whole, and the durability of the bearing 10 can be enhanced.

The fan blade 1 forcibly transferring the air at the inner peripheral portion of the bearing cylinder 7 to the outer peripheral portion to the drive wheel 8.
The provision of 8 can promote the flow of air on the inner peripheral side and the outer peripheral side of the bearing cylinder 7, so that the temperature rise of the bearing 10 can be further suppressed.

An outside air inlet 19 extending radially outward from the shaft end of the drive shaft 3 and supporting the clutch disk 92 of the electromagnetic clutch 9 at the base of a flange 94 communicating with the inner periphery of the bearing cylinder 7. Is provided, the outside air can be easily taken into the clearance on the inner peripheral side of the bearing cylinder 7, and the flow of the taken outside air can be improved. Therefore, the cooling effect of the bearing can be enhanced while the structure is simple. is there.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of only a main part of the compressor of the present invention.

FIG. 2 is a front view of only a bearing cylinder portion of the compressor.

FIG. 3 is a vertical sectional side view of FIG. 2;

FIG. 4 is a scaled side view of FIG. 1;

FIG. 5 is a sectional view of the entire compressor.

FIG. 6 is a partial cross-sectional view of only a main part showing another embodiment.

FIG. 7 is a partial sectional view of only a main part showing another embodiment.

FIG. 8 is a sectional view of a conventional compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Mechanical element 3 Drive shaft 3a Projecting shaft part 5 Closure body 6 Mechanical seal 61 Fixed ring 7 Bearing cylinder 8 Drive wheel 9 Electromagnetic clutch 92 Clutch disk 94 Flange 10 Bearing 11 Communication hole 18 Fan blade 19 External air intake

Claims (3)

(57) [Claims] A compression element is provided on one side of a horizontal casing.
And a drive shaft 3 for driving the compression element 2 is protruded outward from the other opening of the casing 1, while a closing cylinder 5 is provided at the opening of the casing 1 with a bearing tube 7 protruding therefrom.
Is mounted on the outer periphery of the bearing sleeve 7 so as to rotatably support the drive wheel 8 via a bearing 10, and between the drive shaft 8 and the protruding shaft portion 3 a protruding outward from the drive shaft 3. In a horizontal open compressor in which an electromagnetic clutch 9 is provided, and a fixed ring 61 of a mechanical seal 6 is attached to an inner portion of the closing body 5, a projecting base portion of the bearing cylinder 7 is arranged in an axial direction from a supporting portion of the bearing 10. A horizontal open compressor characterized in that a communication hole 11 is provided on an inner side to communicate an outer peripheral portion of the bearing cylinder 7 with an outer peripheral portion of the protruding shaft portion 3a. 2. The horizontal open compressor according to claim 1, wherein the drive wheels are provided with fan blades for forcibly transferring air at an inner peripheral portion of the bearing cylinder to an outer peripheral portion. 3. The drive shaft 3 extends radially outward from a shaft end side of the drive shaft 3,
2. The horizontal open compressor according to claim 1, wherein an outside air inlet 19 communicating with an inner peripheral portion of the bearing sleeve 7 is provided at a base of a flange 94 supporting a clutch disk 92 of the electromagnetic clutch 9. 3.