JPH0718424B2 - Scroll type fluid machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of an oil supply mechanism for a scroll sliding portion in a scroll type fluid machine mainly used for a compressor or the like.

(Prior Art) In general, a scroll type fluid machine has fixed and movable scrolls provided with a spiral body inside a casing,
The movable scroll is orbitally driven with respect to the fixed scroll so that a compressive fluid such as a refrigerant is compressed in a compression chamber formed between the scrolls.

(Problems to be Solved by the Invention) By the way, in the scroll type fluid machine as described above, the scrolls provided in the fixed and movable scrolls are made to slide well, and the space between the scrolls is improved. Since it is necessary to seal the compression chamber formed in the
It is necessary to form a predetermined oil film on the sliding surface of each spiral body.

Then, if the amount of oil supplied to the sliding surface of each scroll is insufficient, the sliding characteristics of each scroll will be impaired, and
The sealing property also deteriorates, and the performance of the compressor deteriorates.

On the other hand, if the amount of oil supplied to the sliding surface of each spiral body is too large,
The amount of oil that is discharged to the outside of the compressor also increases,
The problem occurs that the performance and reliability of the system deteriorates.

An object of the present invention is to make it possible to compensate for the shortage of the amount of oil supply in the sliding portion of the fixed and movable scrolls, and to set and manage the amount of the supplementary oil supply so that it is possible to achieve good results in the sliding portion. It is a point to provide a scroll type fluid machine capable of ensuring sliding and reliable sealability.

(Means for Solving the Problems) Therefore, according to the present invention, the fixed scroll (2) and the movable scroll (3) are provided in the upper portion of the casing (1), and the movable scroll is provided in the lower portion of the casing (1). A scroll type fluid machine in which a motor (5) coupled with a drive shaft (7) for driving a scroll (3) is internally provided, while an oil sump (A) for accumulating lubricating oil is provided at the bottom of the casing (1). An outer wall portion (61) for receiving a lower surface of the motor (5) and a recess portion (62) recessed inward of the outer wall portion (61) are provided at a lower portion of the motor (5), and the recess portion (61) is provided. A lower housing (6) provided with a lower bearing (9) for supporting the lower portion of the drive shaft (7) is arranged in the central portion of 62), and the lower housing (6) and the motor (5) are connected to each other. Between which the suction fluid from the external suction pipe (18) is received. The air gap (5a) formed between the stator (51) and the rotor (52) of the motor (5) and the intake fluid of the chamber (19) rises. On the other hand, the lower end of the drive shaft (7) is opened to the oil sump (A) inside the drive shaft (7).
Forming an oil supply passage (7a) extending along the length direction of the air gap (5a) in the drive shaft (7).
(7b) for supplying the oil in the oil supply passage (7a) to the rising intake fluid from the air gap (5a) on the upper opening side of the
Is provided.

(Operation) The lower housing (6) can separate the intake fluid taken in from the external intake pipe (18) and the oil stored in the oil sump (A), and reduces the mixing of oil into the intake fluid in the chamber (19). It is possible to reduce the fluctuation of the oil level in the oil sump (A), and the oil is pumped from the oil sump (A) to the oil supply passage (7a), so that a stable oil supply amount can be obtained and the air gap (5a) The low temperature oil before being supplied to the bearing is supplied to the through hole (7b) provided on the upper opening side, and by mixing this low temperature oil with the intake fluid rising through the air gap (5a), the oil is heated by suction. Can be prevented and the deterioration of volumetric efficiency can be suppressed. Further, the amount of oil flowing out from the through hole (7b) is a predetermined amount corresponding to the hole diameter of the through hole (7b), and there is no excess or deficiency of the controlled oil corresponding to the through hole (7b). By supplying to the sliding parts of the fixed and movable scrolls, it is possible to make up for the lack of oil supply at the sliding parts of both scrolls, and to ensure good sliding and reliable sealability without excess or deficiency. .

(Example) Hereinafter, a scroll type fluid machine according to the present invention will be described with reference to an example of the drawings.

FIG. 1 shows a scroll type fluid machine according to the present invention, in which a scroll body (2b) (3b) is attached to an end plate (2a) (3a) at an upper position inside a dome-shaped hermetic casing (1). While arranging the fixed and movable scrolls (2) and (3) that project,
A motor (5) including a stator (51) and a rotor (52) is arranged at a lower position, and the movable scroll (3) and the motor (5) are communicated with each other via a drive shaft (7).

The upper part of the drive shaft (7) is supported by an upper housing (4) having an upper bearing (8), and the lower part of the drive shaft (7) is supported by a lower housing (6) having a lower bearing (9). It is supported.

The drive shaft (7) is rotated by a balance weight portion (14) integrally formed on the upper end of the drive shaft (7) and a drive pin (15) attached to the balance weight portion (14).
It is transmitted to the revolving scroll (3) via a swing link (16) driven through the and an Oldham ring (17) that constitutes a rotation preventing mechanism, and the movable scroll (3) is transferred to the fixed scroll (2). ) Is revolved to compress a compressible fluid such as a refrigerant in the compression chambers (20) (30) formed between the spiral bodies (2b) and (3b).

Thus, a chamber (19) for receiving the suction fluid from the external suction pipe (18) is formed between the motor (5) and the lower housing (6), and the stator (51) of the motor (5) is formed. The air gap (5a) formed between the rotor (52) and the rotor (52) serves as a passage through which the suction fluid of the chamber (19) rises, and the drive shaft (7) is provided inside the drive shaft (7). ) Forming an oil supply passage (7a) extending along the lengthwise direction of the drive shaft (7a), while the oil in the oil supply passage (7a) is supplied to the upper opening side of the drive shaft air gap (5a) in the drive shaft (7). A through hole (7b) for supplying the ascending suction fluid from the gap (5a) is provided.

The lower housing (6) is provided with an outer wall portion (61) for receiving a lower end surface of the stator (51) on an outer peripheral portion thereof, a recess (62) is provided inside the outer wall portion (61), and the outer wall portion (61) is provided. An inlet passage (63) for the suction fluid from the external suction pipe (18) is provided at one side of the portion (61), and the recess (62) is provided.
And the lower part of the motor (5), the chamber (19) is formed in a space partitioned by the suction pipe (1
The suction fluid from 8) is made to rise from the chamber (19) to the air gap (5a) of the motor (5).

On the other hand, the lower end portion of the oil supply passage (7a) formed inside the drive shaft (7) faces the oil sump (A) of the lubricating oil provided at the bottom portion of the casing (1), and the drive shaft ( 7)
Oil is pumped up to the oil supply passage (7a) in accordance with the rotational drive of
The bearings (8) and (9), the swing link (16), the Oldham ring (17), and other driving parts are lubricated.

Thus, as shown in FIG. 2, the chamber (19)
The intake fluid rising from the above through the air gap (5a) is blown up from the upper opening side of the air gap (5) as indicated by the solid arrow, while the rotational drive of the drive shaft (7) is performed. The drive shaft (7) is generated by centrifugal force caused by
A part of the lubricating oil pumped up to the oil supply passage (7a) is scattered from the through hole (7b) provided in the valve as shown by a dotted arrow in the figure.

Then, the oil scattered from the through hole (7a) is entrained in the intake fluid blown up from the upper opening of the air gap (5a), and the oil content in the intake fluid can be increased.

In this case, the lower housing (6) can partition the intake fluid taken in from the external intake pipe (18) and the oil stored in the oil sump (A), so that the mixing of the oil with the intake fluid in the chamber (19) can be prevented. It is possible to reduce the oil level fluctuation in the oil sump (A) and to increase the flow velocity of the intake fluid that raises the air gap (5a), from the oil sump (A) with less oil level fluctuation to the oil supply passageway (7a). Oil that can be stably pumped can be supplied through the through hole (7b), and furthermore, the intake fluid having an increased oil content due to the oil supply from the through hole (7b) can be supplied to the casing ( Near the inner wall surface of 1),
When the flow is biased upward toward the fixed and movable scrolls (2) and (3), a part of the oil is separated and flows down, but the separated oil amount is small, and , Since the separation rate is almost constant, the through hole (7
In proportion to the amount of oil supplied from b), that is,
It is possible to set the amount of replenishment oil to the suction fluid almost according to the hole diameter and the number of b). Moreover, the oil supplied from the through hole (7b) is directly pumped from the oil sump (A) to the oil supply passage (7a) and kept in a relatively low temperature state before being supplied to each sliding portion. To be drunk.

Therefore, the amount of replenishment oil that can be included in the inhaled fluid can be roughly set, so that the scroll (2)
A controlled amount of oil can be introduced between the spiral bodies (2b) and (3b) of (3), and the spiral bodies (2b) and (3b) can be introduced.
Side wall surfaces of the spiral bodies (2b) and (3b) in contact with each other, and
The spirals (2b) (3b) and the end plates (3a) facing the spirals (2b) (3b)
The sliding surface between (2a) and (2a) can be supplied with a sufficient amount of oil, and the intake fluid taken into each scroll (2) and (3) can be prevented from being heated, so that deterioration of volumetric efficiency can be suppressed. .

(Effects of the Invention) As described above, in the present invention, the upper part of the casing (1) is
A fixed scroll (2) and a movable scroll (3) are mounted inside, and a motor (5) having a drive shaft (7) for driving the movable scroll (3) coupled to the lower part of the casing (1) In a scroll type fluid machine in which an oil sump (A) for accumulating lubricating oil is provided at the bottom of the casing (1), an outer wall part (61) for receiving a lower surface of the motor (5) is provided under the motor (5). ) And a recess (62) recessed inward of the outer wall (61), and a lower bearing (9) for supporting the lower part of the drive shaft (7) at the center of the recess (62). The lower housing (6) provided is arranged to form a chamber (19) between the lower housing (6) and the motor (5) for receiving the suction fluid from the external suction pipe (18). , The stator (51) and the rotor (52) of the motor (5) ) And an air gap (5a) formed between the upper end and the upper end of the oil sump (A) inside the drive shaft (7). The drive shaft (7)
Forming an oil supply passage (7a) extending along the length direction of the air gap (5a) in the drive shaft (7).
(7b) for supplying the oil in the oil supply passage (7a) to the rising intake fluid from the air gap (5a) on the upper opening side of the
The outer wall (6
The lower housing (6) having 1) and the recess (62) can separate the intake fluid and the oil, can reduce the mixing of the oil with the intake fluid in the chamber (19) and can reduce the oil level in the oil sump (A). Fluctuations can be reduced, and from this oil sump (A) to the oil supply passage (7a)
Since oil is pumped to the oil supply, a stable amount of oil can be obtained, and low-temperature oil before it is supplied to the bearing is supplied to the through hole (7b) provided on the upper opening side of the air gap (5a). By mixing oil with the suction fluid rising through the air gap (5a), suction heating by the oil can be prevented and deterioration of volumetric efficiency can be suppressed. Also, the through hole (7
The amount of oil flowing out from b) is a predetermined amount corresponding to the hole diameter of the through hole (7b), and there is no excess or deficiency of the managed oil corresponding to this through hole (7b) for each of the fixed and movable scrolls. By supplying to the sliding surface, it is possible to make up for the lack of oil supply in the sliding parts of both scrolls and to ensure good sliding and reliable sealing without excess or deficiency.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll type compressor according to the present invention, and FIG. 2 is an enlarged sectional view of an essential part for explaining the operation. (1) …… Casing (2) …… Fixed scroll (3) …… Movable scroll (5) …… Motor (5a) …… Air gap (51) …… Stator (52) …… Rotor (6) …… Lower housing (7) …… Drive shaft (7a) …… Oil supply passage (7b) …… Through hole (9) …… Lower bearing (18) …… External suction pipe (19) …… Chamber (61) …… Outer wall Part (62) …… Recessed part (A) …… Oil sump

Claims (1)

[Claims] 1. A fixed scroll (2) and a movable scroll (3) are installed inside a casing (1), and
A motor (5) in which a drive shaft (7) for driving the movable scroll (3) is coupled to the lower portion of the casing (1).
In a scroll type fluid machine in which a casing (1) is provided with an oil sump (A) for accumulating lubricating oil at the bottom of the casing (1), the motor (5) is provided below the motor (5).
An outer wall part (61) for receiving the lower surface of the drive shaft (7), and a recess (62) recessed inwardly of the outer wall part (61), and the lower part of the drive shaft (7) is provided at the center of the recess (62). A lower housing (6) provided with a lower bearing (9) for supporting is disposed, and suction fluid from the external suction pipe (18) is received between the lower housing (6) and the motor (5). A passage through which the suction fluid of the chamber (19) rises through an air gap (5a) which forms the chamber (19) and is formed between the stator (51) and the rotor (52) of the motor (5). On the other hand, inside the drive shaft (7), a lower end portion is opened to the oil sump (A), and an oil supply passage (7a) extending along the length direction of the drive shaft (7) is formed. Further, at the upper opening side of the air gap (5a) in the drive shaft (7), the oil supply passage (7a) is provided. The scroll type fluid machine, characterized in that a hole (7b) for supplying the increased suction fluid from the air gap (5a).