JP3453768B2 - Hermetic scroll fluid machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed scroll fluid machine containing a motor.

[0002]

2. Description of the Related Art Conventionally, in a hermetic scroll fluid machine in which a scroll casing and a motor are housed in a hermetically sealed casing, spiral bodies are meshed with each other at one longitudinal end of a horizontally elongated hermetically sealed casing having both ends closed. For fitting a scroll to fit, a motor having a drive shaft for driving at least one of the scrolls on the other end side, and for supplying lubricating oil to a lubrication point on the shaft end side of the drive shaft. A lubrication pump is provided.

Further, the vertical scroll fluid machine is vertically installed so that one end side (lubrication pump side) in the length direction of the casing is a lower part, and the horizontal scroll fluid machine is a vertical scroll fluid machine in the radial direction of the casing. It is placed horizontally with one side facing down. Therefore, in the case of a vertical scroll fluid machine, the lubricating oil supplied to the oil supply location is stored at one end in the length direction of the casing, and the lubricating pump is arranged on the oil storage side. Since the distance from the bottom surface to the lower end of the motor is relatively long, a sufficient amount of oil required for lubrication can be secured. However, in the case of a horizontal scroll fluid machine, the lubricating oil supplied to the lubrication location is stored on one radial side (lower part) of the casing, so that it is necessary to secure a sufficient amount of oil necessary for lubrication. If so, the height of the oil surface exceeds the rotating portion of the motor.

However, when the oil level exceeds the rotating portion of the motor, the lubricating oil stored on one side of the casing in the radial direction is agitated by the rotation of the rotating portion. In addition to the increase in the input power, the agitated oil is discharged to the outside of the machine together with the fluid discharged or discharged from the scroll, which causes oil spillage and poor lubrication.

Therefore, when the closed casing is of a horizontal type, it is necessary to lower the height of the oil surface of the oil reservoir from that of the rotating portion of the motor, so that a sufficient amount of oil cannot be secured. In addition, in order to secure it, it is necessary to increase the body diameter of the casing.

[0006] Therefore, conventionally, for example, the actual Kaihei 3-19481
As shown in the publication (shown in FIG. 7), the body diameter on the anti-scroll side of the motor M in the horizontally-sealed closed casing C is set to a large diameter, and the oil level in the oil reservoir below the body is increased. The height H is set lower than the height of the rotor R of the motor M, and the amount of oil in the oil reservoir is increased.

In FIG. 7, Fs is a fixed scroll,
Os is a movable scroll, F is an internal housing having a bearing for supporting the drive shaft S of the motor M, A is a suction pipe, and B is B.
Is a discharge pipe, OP is a lubrication pump provided at the shaft end of the drive shaft S, and SP is an oil suction pipe.

[0008]

However, in the conventional example described above, only one end in the length direction of the casing C is formed to have a large diameter, and the oil reservoir is provided over the entire lower portion of the casing C, so that the casing C has a large size. However, it is not possible to secure a sufficient amount of oil, and the oil reservoir contains the motor M.
If the oil level rises due to operating conditions, the rotor R of the motor M will be immersed in the oil level. In this case, the oil agitation phenomenon will occur. The problem of increasing the motor input and the problem of oil rising still remain.

The present invention has been made in view of the above problems, and an object thereof is to secure a sufficient amount of oil and to make the oil level of a motor side chamber in which a motor is housed zero or low. It is possible to secure an effective amount of oil while being able to effectively prevent performance deterioration due to oil agitation in the rotating portion and seizure at a lubrication point due to poor lubrication.

[0010]

In order to achieve the above object, the present invention has at least one of the scrolls 2 and 3 on one side in the lengthwise direction of the closed casing 1 and at least one of the scrolls 2 and 3 on the other side. A hermetic scroll fluid machine in which a motor 5 having a drive shaft 4 for driving is installed, and a lubricating pump 12 for supplying lubricating oil to an oil supply passage 11 provided in the drive shaft 4 is provided on the shaft end side of the drive shaft 4. In the casing 1
An oil tank 17 extending from the end of the casing 1 on the motor side to the scroll side is provided on one lateral side of the two oil equalizing pipes 1.
8 and 19, and the lubricating pump 12
The oil supply pipe 20 is provided at the suction port 12a of the
To the end of the oil tank 17 on the motor side ,
Two oil equalizing pipes 18 and 19 are installed inside the closed casing 1.
It is provided on both sides of the motor 5.

[0011]

The oil tank 17 is preferably detachably attached to the closed casing 1.

[0013]

Since a large amount of filled oil can be stored in the oil tank 17 attached to one side of the casing 1 in the lateral direction, a sufficient amount of oil can be secured especially in the case of the horizontal type, and moreover, the casing. The oil after lubrication returned to 1 is
Since it can be returned to the oil tank 17 from the oil equalizing pipes 18 and 19,
The height of the oil surface in the casing 1 can be kept low, and even if the oil surface height rises depending on operating conditions, it is possible to avoid the rotating part from being immersed in the oil surface, and therefore the problem of oil agitation does not occur. Since the problem of oil rising due to oil agitation can be eliminated, a sufficient amount of oil can be ensured, and since an oil tank 17 separate from the casing 1 can be supplied to an oil supply location, an effective amount of oil can also be ensured. Therefore, the problem of poor lubrication can be solved, and further, the surface area of the oil returned to the oil tank 17 can be increased, the heat dissipation can be enhanced, and the oil can be cooled.

Further, by providing the oil equalizing pipes 18 and 19 on both sides of the motor 5 installed in the closed casing 1,
In the case of a horizontal scroll fluid machine, it is possible to promote the return of the lubricating oil that has been supplied to the oil supply point on the scroll side to the oil tank 17 to the motor, and also between the outer surface of the motor and the inner peripheral surface of the closed casing 1. The amount of returning oil passing through the passage can be reduced, the heating of the oil by the motor 5 can be suppressed, and the oil can be cooled more satisfactorily.

Further, by attaching the oil tank 17 to the closed casing 1 in a detachable manner, in the case of the vertical type, it is possible to secure a sufficient amount of oil without separately providing an oil tank. By removing it, unnecessary oil filling can be eliminated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The scroll fluid machine shown in FIG. 1 is a refrigerant compressor mainly for compressing refrigerant in a refrigerating machine, and has a cylindrical body 1a and a lid 1 for closing both ends of the body 1a.
A fixed scroll 2 having a spiral body 2a and a movable scroll 3 having a spiral body 3a meshing with the spiral body 2a of the fixed scroll 2 are provided inside a closed casing 1 composed of b and 1c in the longitudinal direction. In addition, inside the other side, a motor 5 having a drive shaft 4 for revolving the movable scroll 3 is installed, and in the motor side chamber 6, the fixed scroll 2 is provided on the back side of the movable scroll 3. A first bearing housing 7 which is coupled to the drive shaft 4 is supported by a bearing 7a of the bearing housing 7, and the movable side is provided between the bearing housing 7 and the back surface of the movable scroll 3. An Oldham's joint 8 for preventing the scroll 3 from rotating and revolving is provided, while the counter scroll side of the drive shaft 4 is supported on the counter scroll side of the motor 5 in the motor side chamber 6. A second bearing housing 10 having a ball bearing 9 is internally provided, and a lubricating pump 12 for supplying lubricating oil to an oil supply passage 11 formed in the shaft center portion of the drive shaft 4 is provided in the bearing housing 10 and the fixing is performed. A discharge chamber 14 is provided on the back side of the scroll 2 via a partition wall 13, and a high pressure pipe 15 serving as a discharge pipe is opened in the discharge chamber 14. Also, the casing 1
A low pressure pipe 16 is opened on the scroll side of the motor side chamber 6 in FIG.

The embodiment shown in FIG. 1 is, in the scroll compressor having the above-mentioned structure, one side in the lateral direction of the casing 1, that is, one side in the radial direction of the body 1a.
An oil tank 17 extending from the end of the casing 1 on the motor side to a position near the scroll is provided in the motor side chamber 6
The oil supply pipe 20 is provided at the suction port 12a of the lubrication pump 12 while being attached through a pair of oil equalizing pipes 18 and 19 that are open to the scroll side and the lubrication pump side.
0 through the oil equalizing pipe 19 on the pump side to the oil tank 1
No. 7 is inserted into the end portion on the motor side.

As shown in FIGS. 2 and 3, the oil tank 17 is formed to have a size that fits within the range of the length of the mounting leg 21 in the case of a horizontal type.
Of the oil equalizing pipes 18, 1 at both ends in the length direction on one side in the radial direction of
Install 9.

As shown in FIGS. 1 and 4, a flange 22 having a bolt hole is provided at the tip of each of the oil equalizing pipes 18 and 19, and a screw hole and a screw hole are provided on one lateral side of the casing 1. A pair of mounting pedestals 23 having an oil equalizing hole opening in the motor side chamber 6 are provided, and mounting bolts 24 inserted into the bolt holes of the respective flanges 22 are screwed into the screw holes of the respective mounting pedestals 23. As a result, the oil tank 17 is detachably attached to the casing 1. When the oil tank 17 is removed, as shown in FIGS. 5 and 6, the mounting bolts 24 are used to mount the lids 25 for closing the oil equalizing holes on the mounting pedestals 23.

Further, at least the tip side or the middle part of the oil supply pipe 20 is made flexible so that it can be retracted to the motor side chamber 6 with respect to the oil tank 17, and the oil tank 17 is removed. The oil supply pipe 20 is retracted to the motor side chamber 6. Further, at the tip of the oil supply pipe 20,
In addition to providing the cut-out portion 20a, the lid 25 is provided with a projecting portion 25a which projects into the oil leveling hole.
The tip of the oil supply pipe 20 is brought into contact with a, and the lacking portion 25
The oil is supplied from a. The oil supply pipe 20 is formed by a casing-side oil supply pipe that can be joined and a tank-side oil supply pipe, and when the oil tank 17 is detached,
The tank side oil supply pipe may be removed together with the oil tank 17.

The lubrication pump 12 is operated in association with the rotation of the drive shaft 4. That is, a stepped tubular presser foot 26 that presses the inner ring 9a of the ball bearing 9 is fitted onto the drive shaft 4 and integrally rotatably coupled to the drive shaft 4, and the lubricant 26 is attached to the outer peripheral side of the small diameter portion 26a of the presser foot 26. The pump housing 27 of the pump 12 is arranged, the pump housing 27 is fixed in the cylindrical boss portion 10a of the second bearing housing 10, and the lubricating pump 12 is formed in the inner cavity of the pump housing 27. With inner pump inner 12b and outer pump 12c,
An end plate 28 that closes the inner cavity of the pump housing 27 is disposed on the open side of the pump housing 27, and the end plate 28 is fixed to the boss portion 10 a of the second bearing housing 10.

More specifically, the lubrication pump 12 includes
For example, in the trochoid type, the pump inner 12b is fixed to the outer circumference of the small diameter portion 26a of the presser 26 that rotates together with the drive shaft 4, and the outer peripheral surface of the pump outer 12c is fixed to the pump housing 27.
The inner peripheral surface is rotatably supported so that the inner peripheral surface meshes with the outer periphery of the pump inner 12b. The end plate 28 has a first oil supply communicating with the discharge side of the lubricating pump 12. A discharge passage 29 is provided, the oil supply pipe 20 communicating with the suction port 12a of the lubricating pump 12 is attached, and one end side of the small diameter portion 26a of the presser 26 communicates with the first oil supply discharge passage 29. Then, the second oil supply discharge passage 30 having the other end communicating with the oil supply passage 11 of the drive shaft 4 is provided.

Further, in FIG. 1, reference numeral 31 denotes an oil return pipe composed of a capillary tube having one end opened to the discharge chamber 14 and the other end opened to the motor side chamber 6, and the oil separated in the discharge chamber 14 is It is returned to the motor side chamber 6.

The scroll fluid machine constructed as described above is mainly of a horizontal type in which the hermetic casing 1 is horizontally arranged as shown in FIG. 1, but is of a vertical type in which the hermetic casing 1 is vertically arranged as shown in FIG. May be

Next, the operation of the embodiment configured as described above will be described.

In this embodiment, when the drive shaft 4 is driven by the motor 5, the movable scroll 3 revolves, and the suction fluid such as the gas refrigerant sucked from the low pressure pipe 16 into the motor side chamber 6 is From the inlet between the movable scroll 3 and the fixed scroll 2, the scrolls 2,
Is sucked into the working space formed between the three, compressed by the revolving motion of the movable scroll 3, and discharged into the discharge chamber 14 via the discharge port 2b of the fixed scroll 2 and the discharge valve 32 provided in the partition wall 13, It is discharged to the outside through the high pressure pipe 15.

Further, the lubrication pump 12 is operated by the drive of the drive shaft 4, and the oil stored in the oil tank 17 is sucked in through the oil supply pipe 20, and the first and second oil supply discharge paths are provided. Oil is supplied to the oil supply passage 11 from 29 and 30,
Lubricating oil is supplied to the oil supply location such as the bearing 7a, and the oil supplied to this oil supply location is returned to the scroll side of the motor side chamber 6 and discharged from the discharge port 2b to the discharge chamber 14. The oil separated in the chamber 14 is also returned to the scroll side of the motor side chamber 6 via the oil return pipe 31.

Therefore, when used horizontally as shown in FIG. 1, the oil returned to the scroll side of the motor side chamber 6 from the oil supply point is returned to the oil tank 17 from the scroll side equalizing pipe 18. In addition, the oil flowing from the scroll side of the motor side chamber 6 to the pump side of the motor side chamber 6 through a passage such as a core cut between the outer surface of the motor 5 and the inner peripheral surface of the closed casing 1 is pump side uniform. It is returned from the oil pipe 19 to the oil tank 17.

As a result, the oil surface height of the motor side chamber 6 can be made zero or low, that is, the oil surface height can be set to the rotating portion of the motor 5, that is, the rotor 5b and the balance weights 33, 34. Since the oil tank 17 is attached to one side of the closed casing 1 in the lateral direction, a sufficient amount of oil can be secured. Since the oil supply pipe 20 of the lubrication pump 12 is made to enter, the amount of ineffective oil can be reduced, and the effective amount of oil with respect to the filling amount of lubricating oil can be sufficiently secured.

Moreover, since the oil level of the motor side chamber 6 can be constantly lowered, there is no oil agitation by the rotating portion,
It is possible to avoid problems such as increase in motor input due to oil agitation and increase in oil rise.

The oil returned to the motor side chamber 6 is
Since the oil is stored in the oil tank 17 attached to the lower part of the closed casing 1, the surface area of this oil can be increased, the heat dissipation can be enhanced, and the oil can be cooled.

Further, since the oil tank 17 is detachable, the oil tank 17 can be detached when used vertically. That is, in the case of the vertical type, the pump side space 6a of the motor side chamber 6, that is, one side in the length direction of the casing 1 becomes an oil storage chamber, and a sufficient amount of oil can be secured in this oil storage chamber. From the oil tank 1
7 does not have to be additionally provided. Therefore, in the case of the vertical type, by removing the oil tank 17, unnecessary oil filling can be eliminated.

This oil tank 17 is detached from the mounting bolt 2
This can be easily done by loosening 4 and releasing the fixing of the flange 22 to the mounting pedestal 23. Also, by using the mounting bolts 24, a separately formed lid 25 can be mounted on the mounting pedestal 23. The oil equalizing hole of the casing 1 is closed and the oil supply pipe 20 is retracted to the motor side chamber 6.

Further, since it can be used for the horizontal type and the vertical type as described above, and the above-mentioned problems in the horizontal type can be eliminated, it is not necessary to separately produce the horizontal type and the vertical type. Therefore, the productivity of the scroll fluid machine can be improved and the cost can be reduced.

In the embodiment described above, the oil tank 1
7, a scroll-side oil equalizing pipe 18 and a pump-side oil equalizing pipe 19
Although the scroll-side oil equalizing pipe 18 is not necessarily required, the scroll-side oil equalizing pipe 18 is not necessarily provided. However, by providing the scroll-side oil equalizing pipe 18, the return of the oil returned from the oil supply location to the scroll side of the motor-side chamber 6 to the oil tank 17 is promoted, that is, the oil level in the motor-side chamber 6 is lowered. The amount of oil passing through a passage such as a core cut between the outer surface of the motor and the inner peripheral surface of the closed casing 1 can be reduced, and heating of the oil by the motor 5 can be avoided.

Further, although the above-described embodiments are examples in which they are applied to the refrigerant compressor, they can also be applied to other compressors and expanders.

Further, although one of the scrolls 2 and 3 is a fixed scroll and the other scroll 3 is a movable scroll, both scrolls 2 and 3 may be movable.

[0038]

As described above, according to the present invention, the scrolls 2, 3 and the scrolls 2, 3 are provided in the horizontal casing 1.
A motor 5 having a drive shaft 4 for driving at least one of
In a hermetically sealed scroll fluid machine which is provided with a lubricating pump 12 for supplying lubricating oil to an oil supply passage 11 of the drive shaft 4, a motor of the casing 1 is provided on one lateral side of the casing 1. An oil tank 17 extending from the side end portion to the scroll side is attached via oil equalizing pipes 18 and 19, and an oil supply pipe 20 is provided at an intake port 12a of the lubricating pump 12, and the oil supply pipe 20 is connected to the oil tank 17 of the oil tank 17. Since the oil is rushed into the end portion on the motor side, it is possible to secure a sufficient amount of oil, and yet it is possible to secure an effective amount of oil while reducing the height of the oil surface in the casing 1.

Therefore, the problem of poor lubrication due to lack of oil in the horizontal type can be solved, and even if the oil level rises due to operating conditions, the rotating part can be prevented from being immersed in the oil level.
It is possible to eliminate the oil agitation in this rotating portion, and it is possible to solve the problems of an increase in the motor input and the oil rising due to the oil agitation, and also the surface area of the oil returned to the oil tank 17. It can increase the heat dissipation.
Oil cooling is also possible.

Further, by providing the oil equalizing pipes 18 and 19 on both sides of the motor 5 installed in the closed casing 1,
In the case of a horizontal scroll fluid machine, it is possible to promote the return of the lubricating oil that has been supplied to the oil supply point on the scroll side to the oil tank 17 to the motor, and also between the outer surface of the motor and the inner peripheral surface of the closed casing 1. The amount of returned oil passing through the passage can be reduced, the heating of the oil by the motor 5 can be avoided, and the oil can be cooled more favorably.

Further, by attaching the oil tank 17 to the closed casing 1 in a detachable manner, in the case of the vertical type, it is possible to secure a sufficient amount of oil without separately providing an oil tank. By removing it, unnecessary oil filling can be eliminated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a schematic side view in the case of a horizontal type.

FIG. 3 is a schematic side view showing another example in the case of the horizontal shape.

FIG. 4 is an enlarged sectional view of an oil tank mounting portion.

FIG. 5 is an enlarged cross-sectional view of an oil tank detaching portion in the case of a vertical type.

FIG. 6 is a vertical cross-sectional view of a vertical type.

FIG. 7 is a vertical cross-sectional view showing a conventional example.

[Explanation of symbols]

1 closed casing 2 scroll 3 scroll 4 drive shaft 5 motors 11 Refueling passage 12 Lubrication pump 17 oil tank 18, 19 Oil level pipe 20 Oil supply pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-17774 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 29/02 F04C 18/02

Claims (2)

(57) [Claims] 1. A closed casing 1 is provided with a sleeve on one side in the length direction.
Crawls 2 and 3 on the other side
Internally equipped with a motor 5 having a drive shaft 4 for driving at least one
The drive shaft 4 provided on the drive shaft 4 at the end of the drive shaft 4.
A lubricating pump 12 for supplying lubricating oil is provided in the oil passage 11.
In the closed scroll fluid machine, the casing 1
From one end of the casing 1 on the motor side to one side in the lateral direction of
The oil tank 17 extending to the scroll side is provided with two oil equalizing pipes 1.
8 and 19, and the lubricating pump 12
The oil supply pipe 20 is provided at the suction port 12a of the
To the end of the oil tank 17 on the motor side.
The two oil equalizing pipes 18 and 19 are the closed casing.
Must be installed on both sides of the motor 5 installed inside 1.
A sealed scroll fluid machine characterized by. 2. The hermetic scroll fluid machine according to claim 1, wherein the oil tank 17 is detachably attached to the hermetic casing 1.