JPH0245685A - Oil supply mechanism for horizontal open compressor - Google Patents

Abstract

PURPOSE:To positively cool a seal assembly unit by providing an orifice in a supply oil passage reaching a compression element side. CONSTITUTION:A drive shaft 7 provides in its shaft inside a supply oil passage 71 having the first and second passages 71a, 71b distributing oil, sucked from a supply oil pump 20, to the side of a compression element A and to the side of a bearing 9 and a seal assembly unit 10. And the first passage 71a, reaching the side of the compression element A, provides an orifice 30 limiting a supply amount of oil to the first passage 71a and compensating a supply amount of oil to the second passage 71b reaching the side of the bearing 9 and the seal assembly unit 10. In this way, the seal assembly unit 10 can be surely prevented from its seizure due to insufficiency of oil.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention mainly relates to an oil supply mechanism for a horizontal open compressor used in a refrigeration system.

(Prior Art) Conventionally, a model open compressor in which a compression element is driven by power from an external drive source is disclosed in Japanese Patent Application Laid-Open No. 61-291792, and as shown in FIG. , a horizontal casing (C) with one side open, and a fixed scroll (S,
) and a movable scroll (S2).
The movable scroll (
The drive shaft (D) that drives the casing (C
) is made to protrude outward from the open side, and a boo U-(P) linked to an external drive source is attached to the protruding shaft portion.

Incidentally, the drive shaft (D) is supported via a first bearing (B,) on a front end plate (F) fixed to the open side of the casing (C), and (F) is supported on the outer tip side of the sleeve (E) fixed through the second bearing (B2), and the front seal assembly (G) is assembled inside the sleeve (E). The drive shaft (D) is rotated by the drive of the pulley (P) to revolve the movable scroll (B2), and the refrigerant gas sucked from the suction port (H) is compressed;
The liquid is discharged from the discharge port (K) of the fixed scroll (S,) through the discharge chamber (L).

(Problem to be Solved by the Invention) However, in the compressor configured as described above, since the front seal assembly (G) is provided within the sleeve (E), this assembly (G) Casing (C)
The inside is sealed, and the refrigerant and oil in the casing (C) do not leak to the outside, but since cooling of the front seal assembly (G) is not taken into consideration, its durability is limited. Unfortunately, there is a problem that the seal of the casing (C) deteriorates.

That is, the front seal assembly (G) is assembled between the sleeve (E) and the drive shaft (D), and is heated by the drive rotation of the drive shaft (D), so it is difficult to cool it. If this is not done proactively, the sealing function will deteriorate.

An object of the present invention is to actively cool a seal assembly provided on the open side of a horizontal casing by using lubricating oil supplied to a lubricating point, thereby increasing the durability of the seal assembly. It is in.

(Means for Solving the Problems) Accordingly, the present invention has a compression element (A) installed in one side of a horizontal casing (1), and a drive shaft (7) for driving the compression element (A). A lubrication mechanism for a horizontal open compressor that projects outward from the other open side of a casing (1) and is driven by an external drive source, the lubrication mechanism of the casing (1) being driven by an external drive source.
A bearing (9) supporting the drive shaft (7) is disposed on the open side of the drive shaft (7).
) and a seal assembly (10) for sealing against leakage around the drive shaft (7), and the compression element (
An oil supply pump (20) for pumping up oil from the bottom oil reservoir (1a) is disposed between A) and the bearing (9), and the pump (20) is disposed within the shaft of the drive shaft (7). first and second passages (7) that distribute the oil pumped up from the compressor element (A) side and the bearing (9) and seal assembly (10) side;
1a) An oil supply passage (71) having a diameter (7l b) is provided, and the oil supply amount of the first passage (71a) is limited to the first passage (71a) leading to the compression element (A) side. (
9) and a second passageway (7l) leading to the seal assembly (10) side.
b) is provided with an orifice (30) to compensate for the amount of oil supplied.

(Function) A compression element (A) is installed inside one side of the casing (1) and is driven by a drive shaft (7), and a compression element (A) is provided on the other open side of the casing (1) and drives the drive shaft (7). Supporting bearing (
There is an oil supply pump (20) between the drive shaft (7) and the compression element (A) side and the bearing (9) and the bearing. A seal assembly (10) is provided on the side and seals leakage from around the drive shaft (7), and first and second passages (71)
a) Since there is an oil supply passage (71) with (7l b), the oil in the bottom oil reservoir (1a) is pumped up by the oil supply pump (20) and the oil is pumped up into the first passage (71a) and the first passage of the oil supply passage (71). The compression element (
A) Bearing part, bearing (9) and seal assembly (10)
Therefore, the bearing portion of the compression element (A), the bearing (9), and the seal assembly (10) can be quickly lubricated even at the initial stage of starting up the compressor. Further, an orifice (30) is provided in the first passage (71a) leading to the compression element (A) side to limit the amount of oil supplied to the first passage (71a), and the bearing (9) and seal assembly ( Since the amount of oil supplied to the second passageway (71b) leading to the side (10) is compensated, the seal assembly (71b)
10) can be reliably cooled, and seizing of the seal assembly (10) due to lack of lubricating oil can be reliably prevented.

(Example) In the figure, (1) is a horizontal casing with one side closed and the other side open and having a bottom oil reservoir (1a) at the bottom. A compression element (A) consisting of a fixed scroll (2), a revolving scroll (3) that revolves around the fixed scroll (2), and a revolving mechanism (4) that revolves the revolving scroll (3), and a frame. (5) and a housing (6) extending toward the open side of the casing at one end of the bridge (5).
At the same time, the bridge (5) and the housing (6) are attached.
), one drive shaft (7) is arranged freely to rotate, one end of this drive shaft (7) is interlocked with the revolution mechanism (4), and the other drive shaft (7) The end side is made to protrude outward from the opening (1b) of the casing (1), and a drive wheel (8) is attached to this protrusion so as to be driven by an external drive source.

Thus, in the illustrated embodiment, the casing (1)
A bearing (9) is provided in the center of the housing (6) provided near the open side of the housing to support the drive shaft (7), and
The bearing (9) and the opening (1b) of the casing (1)
) A seal assembly (10) for sealing leakage from around the drive shaft (7) is disposed between the inner side and the drive shaft between the compression element (A) and the bearing (9). An oil supply pump (20) for pumping up oil from the bottom oil reservoir (1a) of the casing (1) is disposed around the drive shaft (7).
) is pumped up from the compression element (A) side and the bearing (
9) and the seal assembly (10) side, a first passageway (71) having first and second passageways (71a) (7lb) is provided, and the first passageway (71) leads to the compression element (A) side. An orifice (30) that limits the amount of oil supplied to the first passage (71a) and compensates the amount of oil supplied to the second passage (7lb) leading to the bearing (9) and seal assembly (10) side. ) to ensure that the seal assembly (10) is cooled.

The oil supply passage (71) includes one main passage (71c) that opens at the outer periphery of the intermediate portion of the drive shaft (7), and the main passage (71).
1c) extending from the back to one end of the drive shaft (7) and passing through the first passage (71a) and the main passage (71c) from the back to the other end of the drive shaft (7). The second passage (which has an abbreviated shape) extends and penetrates in the radial direction from the inner part thereof.
71b), and the oil sent to the first passage (71a) is provided at the bearing part of the revolution mechanism (4) in the compression element (A) and at the center of the bridge (5), and the oil is sent to the drive shaft. (7) The bearing (40) supporting one end side is supplied with oil. In addition, the first passage (71a) and the second passage (7l)
The inlet side portion b) is formed to have a relatively large inner diameter so that machining with a drill can be easily performed.

The seal assembly (10) also includes the opening (1b).
A metallic valve seat (11) provided on the inner surface, a metallic valve body (12) that faces the valve seat, an elastic cylinder (13) held on the outer periphery of the drive shaft (7), and the valve body (12) connected to the valve seat. (11) The opening (1b) is closed by contact with the valve seat (11) of the valve body (12), which is a mechanical seal equipped with a spring (14) that urges the valve body (11) in the casing (1) direction. ) is prevented from leaking outside around the drive shaft (7). Note that the seal assembly (10) may have a structure other than a mechanical seal. Further, the orifice (30) is composed of an orifice tube having a throttle hole with a smaller diameter than the inner diameter of the first passageway (71a), and this orifice tube is screwed onto the inner surface of the outlet of the first passageway (71a). , limits the amount of oil supplied to the compression element (A) from the first passage (71a). In order to limit the amount of oil supplied to the first passage (71a) and compensate for the amount of oil supplied to the second passage (71b), a seal assembly ( 10), making it difficult for oil to reach the seal assembly (10), and especially when using a mechanical seal, the valve body (12) and valve seat (
This is because frictional heat is likely to be generated at the contact portion with 11).

Further, the orifice (30) may be provided not only at the outlet of the first passageway (71a) but also at the entrance or intermediate portion of the first passageway (71a).

Further, the oil supply pump (20) has an eccentric groove (21) on the outer peripheral surface.
cylindrical rotor (21) with a) and vanes (22)
The rotor (21) is fitted around the outer periphery of the drive shaft (7) in a relatively non-rotatable manner, and the cylindrical outer surface (2l b) of the rotor (21) is fitted into the housing (6).
A circular hole (61) is provided in sliding contact with the eccentric groove (21a).
) and the circular hole (61) form a cylinder chamber (23), and the eccentric groove (21) is formed in the housing (6).
a), and the top part is in contact with the bottom surface of the cylinder chamber (2).
3) is provided with the vane (22) that partitions the air purifier into a suction chamber (23a) and a discharge chamber (23b), and a vane spring (24) that presses the vane (22).

Further, the vane (22) in the housing (6)
As shown in FIG. 3, the suction chambers (23a) are located on both sides of the
A suction passage (62) opening to the discharge chamber (23b) and a discharge passage (63) opening to the discharge chamber (23b) are provided.
) is connected to an oil supply pipe (50) having an oil inlet opening into the oil reservoir (1a), and the discharge passage (63)
is formed in the shape of a long hole extending in the axial direction of the housing (6). Then, the cylindrical outer surface (2l) of the rotor (21)
b), the discharge passage (63) and the oil supply passage (71) are arranged at a predetermined interval in the axial direction from the eccentric groove (21a).
An annular groove (21c) communicating with the main passageway (71c) is provided to direct the oil in the discharge chamber (23b) to the oil supply passageway (71c).
) can be refueled.

Further, a communication passage (21d) that opens to the outlet of the second passage (7l b) is provided on the inner surface of one end of the rotor (21), so that the oil sent to the second passage (7l b) is connected to the second passage (7l b). The bearing (10) is supplied with oil through the communication path (21d), and the seal assembly (10) is further supplied with oil through the gap between the inner ring and the outer ring of the bearing (9).

Note that (62) in the figure is a heat radiation hole provided in the housing song (6) to radiate heat from the seal body (30) 11.

The present invention is constructed as described above, and by driving the drive shaft (7), the bottom oil sump (
1a) is sucked into the suction chamber (23a) of the cylinder chamber (23) through the oil supply pipe (5o) and the suction path (62),
As the drive shaft (7) rotates, the eccentric groove (21a)
The positional relationship with the vane (22) changes, and the suction chamber (
The oil 23a) is discharged into the discharge chamber (23b), and is supplied from the discharge chamber (23b) to the oil supply passage (71) via the discharge passage (63). And this refueling passage (71)
from the outlet of the main passage (71c) to the first and second passages (71a) (7lb), and from the first passage (71a) to the bearing part of the compression element (A), 7l b) to bearing (9) and seal assembly (
10) can be refueled. In this way, oil can be distributed between the first and second passages (71a) (7lb) and supplied to the compression element (A) side and the bearing (9) and seal assembly (10) sides. Even at the initial stage of machine startup, each lubricating point can be quickly supplied with oil, and the first passage (71a) is equipped with an orifice (3
0) to limit the amount of oil supplied to the first passage (71a) and a second passage leading to the bearing (9) and seal assembly (10) side.
Since the amount of oil supplied to the passage (71b) is compensated, even if the structure is such that the bearing portion of the compression element (A), the bearing (9), and the seal assembly (10) are supplied with oil in a distributed manner as described above. Seal assembly (10) provided on the bearing (9) side
) can always be supplied with a predetermined amount of oil.

Therefore, there is no oil shortage in the seal assembly (10).
This seal assembly (10) can be reliably cooled and seizure of the seal assembly (10) can be reliably prevented.

(Effects of the Invention) As described above, the present invention has a compression element (A) installed inside one side of a horizontal casing (1), and a drive shaft (7) for driving the compression element (A) attached to the casing (1). A refueling mechanism for a horizontal open compressor that projects outward from the other open side and is driven by an external drive source, the drive shaft (7) being mounted on the open side of the casing (1). Supporting bearing (
9), and a seal assembly (10) for sealing against leakage from around the drive shaft (7), and a bottom oil sump is provided between the compression element (A) and the bearing (9). An oil supply pump (20) for pumping oil from the drive shaft (7) is provided, and the oil pumped from the pump (20) is pumped between the compression element (A) side and the drive shaft (7). First and second passages (
Since the oil supply passage (71) with the oil supply passage (71a) (71b) is provided, even in the initial stage of starting the compressor, the bearing portion of the compression element (A) and the bearing (9) of the drive shaft (7) are provided.
), the seal assembly (10), and other lubricating points can be quickly and reliably supplied with a predetermined amount of oil.
The amount of oil supplied in the first passage (71a) is distributed to the first passage (71a) leading to the compression element (A) side of the oil supply passage (71) divided into the first passage (71a) and the second passage (7l b). Since the orifice (30) is provided to limit the amount of oil supplied to the second passageway (7lb) leading to the bearing (9) and the seal assembly (1o), the seal assembly (10)
Since there is no oil shortage and the oil necessary for cooling is supplied to the seal assembly (1o), the seal assembly (1o) can be reliably cooled and seizure of the seal assembly (1o) can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view showing an embodiment of the oil supply mechanism of the present invention, FIGS. 2 and 3 are sectional views of only the oil supply pump portion, and FIG. 4 is an explanatory diagram of a conventional example. (1)...Casing (la)...Bottom oil reservoir (A)...Compression element (7)...Drive shaft (7e)...Oil supply passage (71a... ...First passage (7l b)...Second passage (9)...Bearing (10)...Seal assembly (20)...Oil pump (30)... orifice

Claims (1)

[Claims] 1) A compression element (A) is installed inside one side of the horizontal casing (1), and a drive shaft (7) for driving the compression element (A) projects outward from the other open side of the casing (1). Let me,
A refueling mechanism for a horizontal open compressor driven by an external drive source, the casing (1) having an oil supply mechanism on the open side of the casing (1).
a bearing (9) that supports the drive shaft (7);
7) Seal assembly (10) to seal against leakage from surroundings
and the compression element (A) and the transport (9).
An oil supply pump (20) for pumping up oil from the bottom oil reservoir (1a) is disposed between the drive shaft (7) and the oil pump (20) pumped up from the pump (20). First and second passages (71a) (71b) divided into the compression element (A) side and the bearing (9) and seal assembly (10) side
an oil supply passageway (71) having a
In the first passageway (71a) leading to the side, the first passageway (71a)
The bearing (9) and the seal assembly (
10) An oil supply mechanism for a horizontal open compressor, characterized in that an orifice (30) is provided to compensate for the amount of oil supplied to the second passageway (71b) leading to the side.