JPH0245686A - Horizontal open compressor - Google Patents

Abstract

PURPOSE:To decrease axial deflection of a drive shaft by center-shaft supporting the drive shaft while mounting a supply oil pump to be interposed between two bearings in the drive shaft. CONSTITUTION:The first bearing 9 is provided adjacent to a compression element A in a mounting structure 5 internally mounted to a casing 1, further the second bearing 10 is provided adjacent to an opening side of the casing 1. A drive shaft 7 is supported in a center-shaft manner to each of these bearings 9, 10, while a supply oil pump 20, sucking oil from a bottom part oil reservoir 1a, is mounted interposing between both the bearings 9, 10. The drive shaft 7, being supported in the center-shaft manner, enables axial deflection to be minimized of the drive shaft 7 while even axial deflection to be eliminated by driving of the pump 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a horizontal open compressor mainly used in refrigeration equipment.

(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 pulley (P) interlocked with an external drive source is attached to this protruding shaft portion.

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

(Problem to be Solved by the Invention) However, in the compressor configured as described above, the drive shaft (D) is connected to the front end plate (F) and the sleeve (F) fixed to the front end plate (F). E)
Each of the bearings (B, ) (B2) is provided at the tip of the sleeve (B, E), and in particular, the second bearing (B2) projects the sleeve (E) outward from the front end plate (F), The pulley (P) is provided at the tip of this protrusion.
When driving the drive shaft (D) described in 11 by inputting the driving force from Although the oil supply mechanism for the lubricated parts that require lubrication is not shown, the structure described above does not allow for a compact oil supply mechanism, which makes it complicated to assemble the oil supply mechanism, and in some cases, the entire oil supply mechanism becomes complicated. There are also problems that are getting bigger.

The purpose of the present invention is to support the drive shaft of a horizontal open compressor with less wheel deflection, improve its durability, and incorporate a refueling pump using the dead space without significantly increasing the axial dimension. It is small and allows lubricating points to be supplied.

(Means for Solving the Problems) The present invention provides a compression element (A
) and drives the compression element (A).
The horizontal open compressor is driven by an external drive source by projecting outward from the other open side of the casing (1), the bridge (5) being built into the casing (1).
) a first bearing (9) is provided near the compression element (A);
and a second bearing (
10), and these bearings (9) and (10) support the drive shaft (7) on both sides, and the drive shaft (7)
) between the first and second bearings (9) and (10), an oil supply pump (2) pumping up oil from the bottom oil reservoir (1a).
0), while distributing the oil pumped up from the pump (20) into the first bearing (9) side and the second bearing (10) side within the shaft of the drive shaft (7). 1st and 2nd
Refueling passage (71) with passage (71a) (7l b)
).

(Function) Since the drive shaft (7) is supported on both sides by the first and second bearings (9) and (10) provided on the bridge (5) installed in the horizontal casing (1), the drive shaft ( The axis tA of 7) can be minimized, and since the oil supply pump (20) is interposed between each of the bearings (9) and (10), this pump (20)
The shaft deflection caused by the drive of the pump (2) can also be eliminated.
Since the axial dimension is not increased while providing the drive shaft (7), it is possible to downsize the drive shaft (7).
The oil pumped up from the pump (20) is transferred to the first bearing (9).
) side and the second bearing (10) side, the oil supply passage (71
), the oil in the bottom oil sump (1a) is pumped into the oil supply pump (
20) and the first passage (71) of the refueling passage (71).
a) and the second passage (7l b), and the first and second bearings (9) and (10) can be supplied with oil. Therefore, even in the initial stage of compressor startup, the first and second The bearings (9) and (10) can be quickly refilled with oil.

(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, a first bearing (9) is provided near the compression element (A) in the bridge (5), and a second bearing (9) is provided near the open side of the casing (1).
10) to connect the drive shaft (7) to the first bearing (
9) and a second bearing (10), and around the drive shaft (7) between the first and second bearings (9) and (10). Oil supply pump (20) that pumps oil from the bottom oil sump (1a)
while distributing the oil pumped up from the pump (20) to the first bearing (9) side and the second bearing (IO) side within the shaft of the drive shaft (7). A fuel supply passage (71) having a second passage (71a) (7lb) is provided.

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 (71c).
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) supplies the bearing portion of the revolution mechanism (4) and the first bearing (9), and the second passage (71a) 7l
b) is to supply oil to the second bearing (10) and the mechanical seal (30) which will be installed later.

Note that the oil supply to the mechanical seal (30) also serves to cool the mechanical seal (30).
The amount of oil supplied to the second bearing (10) and the mechanical seal (30) through the second passage (2l b) is greater than the amount of oil supplied to each of the lubrication points through the passage (71a). As such, in the first passage (71a),
An orifice (71d) is provided to adjust the amount of oil supplied.

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) and is connected to the housing (6) so that the rotor (21) cannot rotate relative to the drive shaft (7), and the rotor (21) A circular hole (61
), the eccentric groove (21a) and the circular hole (61) are provided.
A cylinder chamber (23) is formed by forming a cylinder chamber (23), and the top portion of the housing (6) is brought into contact with the bottom surface of the eccentric groove (21a), and the cylinder chamber (23) is formed 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, a suction passage (62) opening into the suction chamber (23a) and a discharge passage (63) opening into the discharge chamber (23b) are provided on both sides of the suction passage ( 62)
is connected to an oil supply pipe (11) having an oil inlet opening into the oil reservoir (1a), and the discharge passage (63) has a length extending in the axial direction of the song (6). It is formed into a hole shape. Then, the cylindrical outer surface (2l) of the rotor (21)
b) is provided with an annular groove (21c) communicating with the main passage (71c) of the discharge passage (63) and the oil supply passage (71) at a predetermined interval in the axial direction from the eccentric groove (21a); , the oil in the discharge chamber (23b) is transferred to the oil supply passageway (71).
We are making it possible to refuel.

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 second bearing (10) is supplied with oil through the communication path (21d).

Further, on the outer circumference of the drive shaft (7) between the open port (1b) and the second bearing (10), a seal is provided on the inner surface of the open port (1b) and is in contact with a seal valve seat (31). Said mechanical seal (30) with a valve (32)
) is provided to prevent fluid such as refrigerant in the casing (1) from leaking to the outside from the opening (1b).

This mechanical seal (30) is made of rubber sealing material (
33) on the drive shaft (7) to prevent leakage from the outer peripheral surface of the drive shaft, and the seal valve seat (3) of the seal valve (32)
1) closes the opening (1b). Further, the mechanical seal (30) communicates with the second passage (7l b), and the mechanical seal (30) communicates with the second passage (7l b).
) can be supplied to the mechanical seal (30).

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

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 (11) and the suction path (62),
As the drive shaft (7) rotates, the positional relationship between the eccentric groove (21a) and the vane (22) changes, and the suction chamber (2) changes.
The oil of 3a) is discharged into the discharge chamber (23b>), and from this discharge chamber (23b) passes through the discharge passage (63) to the oil supply passage (
71). The first and second passages (
71a) (7l b), from the first passage (71a) to the first bearing (9) part, and from the second passage (71a) to the first bearing (9) part.
7l b) can supply oil to the second Nl receiver (10) and mechanical seal (30) all. In this way, oil can be distributed between the first and second passages (71a) (7lb) and supplied to the first bearing (9) side and the second bearing (10) side. Also, each lubricating point, the first and second bearings (9) and (10), and the mechanical seal (30) can all be quickly supplied with oil. In addition, the drive shaft (7) is supported on both sides via the first and second bearings (9) and (10), and a refueling pump ( 20), it is possible to eliminate the need for the entire compressor to become larger due to the provision of the oil supply pump (20), and to make the entire compressor more compact.

(Effects of the Invention) As described above, the present invention provides the first bearing (9) near the compression element (A) of the bridge (5) installed in the horizontal casing (1).
Also, a second bearing (
10), and with these bearings (9) and (10),
The drive shaft (7) is supported on both sides, and these first
and the bottom oil sump (1a) between the second bearings (9) and (10).
), the shaft pinching of the drive shaft (7) can be minimized.
Therefore, the durability of each of the bearings (9) and (10) can be increased, and the pump (
first and second passages (7) that distribute the oil pumped up from the first bearing (9) and the second bearing (10);
1a) Since the oil supply passage (71) with (71b) is provided, a predetermined amount of oil can be quickly and reliably supplied to the lubrication points such as the bearings (9) and (10) even in the early stages of starting up the compressor. In addition, the oil supply pump (2)
0) is installed in the dead space around the middle part of the drive shaft (7) which is supported on both sides via the bearings (9) and (10), so the compression ratio is low even though the oil supply pump (20) is installed. This allows the entire machine to be made more compact.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view of the compressor of the present invention, FIGS. 2 and 3 are sectional views of only the oil supply pump portion, and FIG. 4 is an explanatory view of a conventional example. (1)...Casing (1a)...Bottom oil reservoir (A)...Compression element (7)...Drive shaft (71)...Oil supply passage (71a)... ...First passage (7l b)...Second passage (9)...First bearing (10)...Second bearing (20)...Oil pump

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 horizontal open compressor driven by an external drive source, wherein a first bearing (9) is provided near the compression element (A) of a frame (5) installed in a casing (1), and
A second bearing (10) near the open side of the casing (1)
are provided, and the drive shaft (7) is supported on both sides by these bearings (9) and (10), and between the first and second bearings (9) and (10) on the drive shaft (7). , an oil supply pump (20) that pumps oil from the bottom oil sump (1a)
while distributing the oil pumped up from the pump (20) to the first bearing (9) side and the second bearing (10) side within the shaft of the drive shaft (7). A horizontal open compressor characterized by being provided with an oil supply passage (71) having a second passage (71a) and a second passage (71b).