JP2522459B2 - Scroll type fluid machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a scroll type fluid machine used for a refrigerant compressor or the like in a refrigeration system.

(Prior Art) Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 2-91488 and shown in FIG. 4, a fixed side first scroll (F) is provided above a casing (C) via a housing (H). ) And a second scroll (O) on the movable side, and a motor (M) disposed below the second scroll (O), and a pin portion (P) provided at the upper shaft end of the drive shaft (D) is provided. Movable scroll (O)
Working fluid which is fitted into the boss cylinder (T) of the second scroll, rotates the first scroll (O) with respect to the second scroll (F) by the rotation of the drive shaft (D), and sucks from the suction pipe (X). Is compressed in the working chamber (E) and taken out from the discharge pipe (Y) to the outside.

And, in order to make a smooth sliding motion in each sliding part,
Generally, an oil supply passage (R) extending from a bottom oil sump is provided inside the drive shaft (D), and an upper portion of the oil supply passage (R) is provided with an end surface of the pin portion (P) and the boss cylinder (T). The pin portion (P) is opened at the fitting gap (G) with the bottom surface.
A pressure release and oil outflow groove (S) for communicating the fitting gap (G) with the inside of the casing (C) is formed in a notch on the outer peripheral part of the oil circulation passage for pumping oil into the oil supply passage (R). After being formed, the bearing metal (N) and the fitting portion between the pin portion (P) and the boss cylinder (T) are lubricated, and the oil after lubrication is accommodated in the accommodating chamber (Q) of the pin portion (P). ) And the oil drain hole (L) to the upper space (U) of the motor (M) and return it to the bottom oil sump.

(Problems to be solved by the invention) However, in the above conventional structure, the oil discharged from the accommodation chamber (Q) to the upper space (U) through the discharge hole (L) is
Not only a small amount of oil that oozes out after wetting the fitting surface between the pin (P) and the boss cylinder (T) and the sliding surface of the bearing metal (N), but also to secure an oil circulation path. In addition, a large amount of oil overflowing from the upper end of the oil supply passage (R) via the oil outflow groove (S) is contained, and such a large amount of oil is discharged to the space (U) above the motor (M). Therefore, a large amount of oil mist is generated by the stirring action accompanying the rotation of the motor (M), a large amount of oil is mixed in the working fluid, and flows out from the discharge pipe (Y) to the outside through the working chamber (E). There is a so-called oil rising problem in which the amount of oil increases excessively and the oil in the bottom oil reservoir decreases, leading to poor oil supply. Further, in the storage chamber (Q), the pin portion (P) needs to push away a large amount of spilled oil and rotate, which causes a problem of causing power loss.

The above problems are caused by the drive shaft (D)
The number of revolutions becomes faster, and the amount of oil pumped up in the oil supply passage (R) increases, which is more noticeable.

An object of the present invention is to provide a scroll type fluid machine that can perform good oil supply and oil discharge without causing oil rising and power loss by devising a structure of an oil discharge path in an oil supply system.

(Means for Solving the Problem) Therefore, in the present invention, in order to achieve the above-mentioned object, the first and second scrolls (1) are provided above a casing (3) in which a bottom oil sump (8) is provided in an inner bottom portion. ) (2) and a motor (4) provided with a drive shaft (5) below, respectively, and a pin portion (6) provided at the upper shaft end of the drive shaft (5) is provided in the second scroll (2). 2) A scroll type fluid machine fitted with the boss cylinder (7) and provided with an oil pump (80) for pumping up the oil in the bottom oil sump (8) at the lower shaft end of the drive shaft (5). At the fitting portion between the pin portion (6) and the boss cylinder (7), an oil pool (10) is provided, while one end of the oil pump (80) is provided inside the drive shaft (5). An oil supply passageway (9) whose other end communicates with the oil pool (10),
An oil discharge passage (11) is provided, one end of which communicates with the oil outflow side of the oil pool (10) and the other end of which opens into a lower space (12) formed below the motor (4).

Secondly, in the above structure, the oil supply passageway (9) is communicated with the oil pool (10) through an oil opening port (13) opening toward the outer peripheral side of the pin portion (6), and The oil outflow side of the oil pool (10) is opened to a fitting gap (14) formed between the end surface of the pin portion (6) and the bottom surface of the boss cylinder (7), and the oil discharge passageway (11) is opened. ) Is opened in the fitting gap (14).

(Operation) The oil sent into the oil supply passageway (9) via the oil pump (80) flows into the oil pool (10) provided between the pin portion (6) and the boss cylinder (7), The oil is discharged from the oil pool (10) through the oil discharge passage (11) to the lower space (12) located below the motor (4) in the casing (3). I can secure a route,
The oil can be satisfactorily supplied and drained, and a large amount of oil overflowing from the oil supply passage (9) is surely discharged to the lower space (12) formed below the motor (4), not on the motor. Therefore, it is possible to reduce the adverse effect of stirring by the rotating portion of the motor (4), prevent a situation where oil is excessively mixed in the working fluid, and avoid oil spillage.
Since the oil pool (10) is provided in the fitting portion between the pin portion (6) and the boss cylinder (7), the pin portion (6) pushes away a large amount of oil and rotates as in the conventional case. Such a situation can be avoided and power loss can be reduced.

According to the second configuration, the oil flowing out from the oil pool (10) flows into the oil discharge passageway (11) through the fitting gap (14) opening at the end face of the pin portion (6), so that centrifugal force is exerted. It is possible to reduce the influence of resistance on the oil drainage caused by the oil flow, and to smoothly flow the oil into the oil drain passage (11).

(Embodiment) FIG. 1 shows a scroll type fluid machine used as a compressor of a refrigerating machine, which is disposed above an inside of a closed casing (3) via an upper housing (30).
A fixed-side first scroll (1) having a scroll (a) protruding from the end plate (A) and a movable second scroll (2) having a scroll (b) protruding from the end plate (B) are provided. A motor (4) having a stator (41) and a rotor (42) is disposed below, and an eccentric pin portion (6) is provided at the upper shaft end of the drive shaft (5). The scroll body is fitted into the boss cylinder (7) of the two scroll (2), and the suction gas taken from the suction pipe (31) into the space (32) above the motor (4) by the rotation of the drive shaft (5) is swirled. Compressed in the working chamber (33) defined between them, the compressed discharge gas is released from the discharge hole (34) at the center of the spiral to the discharge chamber (36) defined by the partition wall (35), and the oil is discharged. After passing through the separator (37), it is taken out from the discharge pipe (38). The oil separated from the discharge gas is returned to the bottom oil sump (8) through the oil return pipe (39).

The drive shaft (5) includes a shaft hole (91) and an eccentric hole (92) continuous with the shaft hole (91).
Oil supply passage (9) communicating with the oil sump (8) through (0)
So that the upper bearing metal (50) is lubricated through the lateral hole (93) and the thrust support surface (20) side of the second scroll (2) is lubricated through the communication passage (94). I have to. The lower part of the drive shaft (5) is supported by the lower bearing metal (82) and the thrust plate (83) provided in the lower housing (81), and the upper bearing metal (5
A balance weight (52) is integrally formed on the lower portion of the large-diameter bearing portion (51) corresponding to (0).

With the above configuration, as clearly shown in FIG. 2, the bearing metal (70) is attached to the outer peripheral surface of the pin (6) fitted into the boss cylinder (7) via the pin bearing metal (70). The oil pool (10) facing the inner surface of () is formed in a notch shape. The oil pool (10) has an upper portion opened into a fitting gap (14) formed between an end surface of the pin portion (6) and a bottom surface of the boss cylinder (7), and a lower portion thereof is described above. The oil pool (10) is located above the lower peripheral portion of the bearing metal (70) to accommodate the oil pool (10) in the accommodating chamber (60) and the casing (3). I'm trying to close it.
Then, the oil supply passageway (9) is communicated with the oil pool (10) through the fitting gap (14).

Further, an oil drain passage (11) extending on the central axis is provided inside the drive shaft (5), and a plug (15) is fitted to an upper end portion of the oil drain passage (11) so that the upper portion is The oil drain passage (11) is closed, and an oil drain communication passage (17) for opening an oil inlet (16) on the oil outflow side located at the bottom of the oil pool (10) is connected to the oil drain passage (11), The oil pool (10) is communicated with the oil discharge passageway (11).

Further, as shown in FIG. 1, an outlet portion at a lower portion of the oil discharge passageway (11) is formed below the motor (4) via an oil discharge hole (18) opening in a radial direction. Lower space (1
2) Open it.

With the above structure, the oil pumped up to the oil supply passage (9) flows into the oil pool (10) through the fitting gap (14) at the upper end as shown by the arrow in FIG. Pass the oil discharge passage (17) from the oil pool (10) and then the oil discharge passage (11)
1, and is further discharged from the oil discharge hole (18) at the outlet to the lower space (12) located below the motor (4), as shown in FIG. With this, an oil circulation path can be configured, and oil can be supplied to the upper bearing metal (50) and the fitting portion between the pin portion (6) and the boss cylinder (7), and from the upper end of the oil supply passage (9). Since a large amount of overflowing oil is discharged to the lower space (12) located below the motor (4), not to the upper space (32) above the motor (4), the rotor of the motor (4) ( 42) and the adverse effects of stirring due to the rotation of the balance weight (52) can be reduced, and excessive mixing of oil in the suction gas can be prevented. Therefore, the oil exceeds the oil return capacity of the oil return pipe (39) and the discharge chamber It is possible to prevent a large amount of oil from flowing out to the (36) and to avoid oil spillage, and moreover the pin portion (6) pushes away a large amount of oil in the accommodating chamber (60) and rotates as in the conventional case. It is possible to avoid such situations, reduce power loss, and perform good lubrication and drainage. Is.

By the way, in the above embodiment, the oil supply passageway (9) is penetrated to the upper part, the oil supply passageway (9) is communicated with the oil pool (10) through the fitting gap (14), and the oil pool (1
The oil outflow side of (0) was communicated with the oil drain passage (11) through the horizontally extending oil drain communication passage (17), but as shown in FIG. An oil supply communication passageway (19) having an oil release port (13) for fitting the stopper (95) to close the upper part and opening the oil supply passageway (9) toward the outer peripheral side of the pin portion (6).
Through the oil pool (10), open the oil outflow side of the upper part of the oil pool (10) to the fitting gap (14), and plug it in the upper part of the oil drain passage (11). It is also possible to open the upper portion thereof into the fitting gap (14) without doing so and to circulate the oil as shown by the arrow in FIG.

Compared to the one shown in FIG. 2, the one shown in FIG. 3 has a drainage passage (11) through a fitting gap (14) which opens largely from the oil pool (10) to the upper end surface of the pin portion (6). Since the oil flows into the oil, it is possible to reduce the influence of the resistance caused by the centrifugal force at the time of oil discharge, the oil can flow smoothly into the oil discharge passageway (11), and the oil can be discharged better. is there.

(Effect of the Invention) As described above, according to the present invention, the pin portion (6) and the boss cylinder (7).
An oil pool (10) is provided in a fitting portion between the oil pump and the drive shaft (5), and one end communicates with the oil pump (80) and the other end communicates with the oil pool (10) inside the drive shaft (5). Oil supply passageway (9) that communicates with the oil outflow side of the oil pool (10) and the other end opens into a lower space (12) formed below the motor (4). ) Is provided, it is possible to avoid a situation in which a large amount of oil is mixed into the working fluid and a situation in which the pin portion (6) pushes away a large amount of oil and rotates, thus preventing oil rising and power loss. Good oil supply and oil drain can be performed without inviting.

Further, the oil supply passageway (9) is communicated with the oil pool (10) through the oil opening port (13) opening toward the outer peripheral side of the pin portion (6), and the oil outflow of this oil pool (10) is made. The side is opened to a fitting gap (14) formed between the end surface of the pin portion (6) and the bottom surface of the boss cylinder (7), and the oil drain passage (1
Since 1) is opened in the fitting gap (14), the oil can smoothly flow from the oil pool (10) into the oil discharge passage (11), and the oil can be discharged more satisfactorily.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll type fluid machine according to the present invention, FIG. 2 is a perspective view of an essential part thereof, FIG. 3 is a perspective view of an essential part showing another embodiment, and FIG. 4 is a sectional view of a conventional example. Is. (1) …… First scroll (2) …… Second scroll (3) …… Casing (4) …… Motor (5) …… Drive shaft (6) …… Pin section (7) …… Boss cylinder ( 8) …… Bottom oil sump (9) …… Oil supply passage (10) …… Oil pool (11) …… Oil discharge passage (12) …… Lower space (13) …… Oil release port (14) …… Fitting Gap (80) …… Oil pump

Claims (2)

(57) [Claims] 1. A first scroll and a second scroll (1) above a casing (3) having a bottom oil sump (8) at the inner bottom thereof.
(2), motor (4) with drive shaft (5) below
And the pin portion (6) provided at the upper shaft end of the drive shaft (5) is provided in each of the boss cylinders (7) of the second scroll (2).
To the lower shaft end of the drive shaft (5),
In a scroll type fluid machine provided with an oil pump (80) for pumping oil from the bottom oil sump (8), an oil pool (10) is provided at a fitting portion between the pin portion (6) and the boss cylinder (7). ) Is provided inside the drive shaft (5), an oil supply passage (9) having one end communicating with the oil pump (80) and the other end communicating with the oil pool (10), and one end having the oil pool. A scroll type which is provided with an oil drain passage (11) communicating with the oil outflow side of (10) and having the other end opened to a lower space (12) formed below the motor (4). Fluid machinery. 2. The oil supply passage (9) is communicated with an oil pool (10) through an oil opening (13) opening toward the outer peripheral side of the pin portion (6), and the oil pool (10) is also connected. ) Is opened to a fitting gap (14) formed between the end surface of the pin portion (6) and the bottom surface of the boss cylinder (7), and the oil drain passage (11) is provided in the fitting gap (14). The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine is opened in the fitting gap (14).