JPH0422795A - Horizontal open type compressor - Google Patents

Abstract

PURPOSE:To let lubricating oil flow out of a communicating hole by providing the communicating hole to communicate the bottom part of a receiving chamber to the circulation system of lubricating oil in a frame body, and providing a taper shaped arc-like slope to enlarge diameter facing to the communicating hole on the bottom of the receiving chamber. CONSTITUTION:A compressor element 3 is mounted in one side of a horizontal casing 1, and the receiving chamber 21 of a driving part 5 to eccentrically rotate the compressor element 3 is provided on a frame body 2 supporting the compressor element 3. In such constitution, a communicating hole 25 to communicate the bottom part of the receiving chamber 21 to the circulation system of lubricating oil is provided in the frame body 2. On the bottom part of the receiving chamber 21, from the communicating hole as base point extending for a prescribed length in the circumferential direction, a taper shaped arc-like slope to enlarge diameter from the compressor element 3 side to the communicathole is provided. Hereby, centrifugal force of turning fluid by driving rotation of the driving part 5 acts on the arc-like 26, and the flowing fluid on the slope 26 smoothly flows out from the communicating hole 25.

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 horizontal 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 compression element (B) consisting of a first scroll (B, ) and a second scroll (B2) is installed on one side of a horizontal casing (A) with one side open, and the casing (A) , a discharge chamber (C) communicating with the discharge port of the compression element (B) is provided, and a drive shaft (D) for driving the compression element (B) is provided.
) protrudes outward from the other side opening of the casing (A), a pulley is attached to the protruding shaft portion, and the second scroll (B) is driven by an external drive source.
2) is eccentrically driven via a drive section (E) to discharge high pressure gas to the outside from the discharge chamber (C).

By the way, by configuring the drive shaft to be driven by an external drive source as described above, the entire compressor can be made smaller compared to a compressor with a built-in drive source, but on the other hand, the casing ( A) becomes smaller, the amount of lubricating oil that can be held in the casing (A) decreases, and the bearing portion of the drive shaft (D) and the scroll (B) become smaller.
, ) (B2) There was a problem in which the amount of oil supplied to movable parts such as the sliding contact parts seemed to be insufficient.

Therefore, as shown in FIG. 5, the applicant first created a housing chamber (F) for housing the drive section (E) in the casing (A), and a housing chamber (F) for housing the drive section (E). An oil receiving portion (H) is provided which communicates through the communication hole (G) and accommodates return oil from the movable portion of the lubricating oil supplied to the movable portion. The receiving portion (H) is partitioned so that oil cannot flow to the bottom oil reservoir of the casing (A), and a balance weight provided on the drive shaft (D) is connected to the oil receiving portion (H). Place it in H),
The oil receiving portion (H) is attached to the tip of the balance weight (I).
) is provided with an edge-shaped oil scattering part that scatters the return oil upward, and the lubricating oil in the oil receiving part (H) is directed upward by the rotation of the balance weight (I) accompanying the drive of the drive shaft (D). We have developed a system in which lubricating oil is dispersed and discharged into the casing (A) through the upper opening window in the oil receiving part (H), thereby ensuring a necessary amount of lubricating oil in the bottom oil reservoir at all times.

(Patent Application No. 83-262412) (Problem to be Solved by the Invention) The storage chamber (F) and the oil receiving portion (H) are partitioned and formed as described above, and the oil receiving portion (H) is separated from the storage chamber (F) and the oil receiving portion (H). , when the oil returning to the oil receiving part (H) is discharged into the oil reservoir, the compression element (B)
As shown in FIG. As E) rotates, it moves in the circumferential direction of the storage chamber (F), causing a circumferential flow of fluid, so that the lubricating oil mixed with this gas refrigerant flows onto the peripheral wall of the storage chamber (F). It will stick.

Therefore, the peripheral wall constituting the storage chamber (F) may be a parallel cylinder, or the communication hole (G
) If only an inclined groove is formed at the bottom of the peripheral wall leading to
Therefore, the return oil from the accommodation chamber (F) flows into the communication hole (G).
The oil does not flow smoothly from the storage chamber (F) to the oil receiving portion (H).
), and the oil in the oil film layer on the peripheral wall is scraped up and agitated in the circumferential direction by the rotation of the drive section (E) as shown in Figure 6. So,
There is a problem that the load on the drive shaft (D) becomes high and power is lost. Further, there is a problem in that the amount of oil that has accumulated in the storage chamber (F) leaks from the thrust bearing toward the compression element side, resulting in a large amount of oil.

The present invention was invented in view of the above points, and the purpose is to allow the oil returned to the storage chamber to flow out into the lubricating oil circulation system, and to eliminate power loss due to oil agitation on the drive shaft. The present invention is capable of reducing the amount of oil flowing from the storage chamber to the compression element side.

(Means for Solving the Problems) Therefore, the present invention comprises a first scroll (3a) and a second scroll (3b) on one side of a horizontal casing (1), and eccentrically connected via a drive shaft (4). Rotating compression element (3
) and supports the compression element (3).
) for eccentrically rotating the compression element (3)
A horizontal open compressor is provided with a housing chamber (21) for supplying lubricating oil to the drive part (5) and movable parts around the drive part (5), , a communication hole (25) is provided that communicates the bottom of the storage chamber (21) with the oil circulation system for the lubricating oil;
), a tapered arcuate inclined surface extends over a predetermined length in the circumferential direction from the communication hole (25) as a base point and expands in diameter from the compression element (3) side toward the communication hole (25). (26) was established.

(Function) Fluids such as gas refrigerant leaking into the storage chamber (21) and return oil from the drive section move in the circumferential direction of the storage chamber (21) as the drive section (5) rotates. However, since the bottom of the storage chamber (21) is provided with an arcuate inclined surface (26), when the drive unit (5) rotates, the fluid swirled by the drive rotation of the drive unit (5) is Centrifugal force acts on the tapered arcuate inclined surface (26), and the centrifugal force acts in a direction from the compression element side toward the communication hole side,
Since the arcuate inclined surface is tapered and the inner diameter increases in the direction toward the communication hole, the fluid flowing on the inclined surface can absorb the difference in inner diameter with the help of the centrifugal force. This acts to induce the fluid to flow in a curved direction toward the communication hole, and the head difference caused by the inclination allows the fluid to flow out smoothly from the communication hole (25).

(Example) In the figure, (1) is a horizontal casing with one side closed, the center of the other side open, and a bottom oil sump (1a) at the bottom. A frame (2) is provided on one side, and the frame (2) supports a compression element (3) consisting of a first scroll (3a) and a second scroll (3b), and also supports a compression element (3) inside the casing (1). A discharge chamber (work 1) is formed in one side portion and communicates with a discharge port (3c) provided in the center of the first scroll (3a),
On the other side, an internal space (
12). Furthermore, on the upper surface of the casing (1), there are provided a suction pipe (13) that guides suction fluid into the internal space (12), and a discharge pipe (14) that discharges high-pressure fluid from the discharge chamber (11) to the outside. and a drive shaft (4) for driving the compression element (3) protrudes outward from the other side opening of the casing (1) and is driven by an external drive source. A drive unit (5) for eccentrically rotating the second scroll (3b) with respect to the first scroll (3a) is provided between the compression element (3) and the drive shaft (4), while the frame ( 2) is provided with bearings (E3) and (6) for the drive shaft (4), as well as a storage chamber (21) for accommodating the drive section (5) and an oil receiver section (22). A pump housing (23) is provided on the side of the oil receiving portion (22), and the lubricating oil in the bottom oil reservoir (1a) is pumped up into the pump housing (23) to supply the driving portion (5) and the oil receiving portion (22). An oil supply pump (8) that supplies movable parts around the drive part (5) and the oil receiving part (22
) is provided with an oil drain pump (9) for discharging return oil accumulated in the bottom oil sump (12) into the inner space (12), and the lubricating oil in the bottom oil sump (1a) is transferred to the bottom oil sump via the oil receiver (22). (1a
). Moreover, the drive section (5)
includes a counterweight (51) integrally formed with one end of the drive shaft (4) and a swing link (53) connected via a drive bin (52). or,
The drive shaft (4) includes a main passage extending radially inward from a longitudinally intermediate portion, a branch passage extending axially outward from a deep part of the main passage, and a branch passage extending radially from the branch passage. An oil supply passage (41) consisting of a small diameter passage penetrating outward in the direction is provided, and a thrust is provided from the oil supply passage (41) to the compression element side end of the bearing (6) and the accommodation chamber (21). While lubricating oil is supplied to the bearing (10), a balance weight (20) is installed between the bearings (6) of the drive shaft (4).

However, in the embodiment shown in FIGS. 1 to 3, the frame (
2) is provided with a communication hole (25) that communicates the bottom of the storage chamber (21) with the oil circulation system for the lubricating oil, more specifically, with the oil receiver (22); The communication hole (25) is formed in the bottom part from the compression element (3) side over a predetermined length in the circumferential direction from the communication hole (25)
) is provided with a tapered arcuate inclined surface (26) that expands in diameter.

This arcuate inclined surface (26) is formed over a range of approximately 140 degrees on the front side and the rear side in the rotational direction of the drive section (5), respectively, with the communication hole (25) as the base point. It does not have to be within the 140 degree range,
Further, for example, the drive unit (5
) may be provided only on the rear blade side in the driving direction. Incidentally, the arcuate inclined surface (26) is preferably inclined at an angle of about 4 to 7 degrees or more with respect to the horizontal plane.

Further, on the peripheral wall of the compression element (3) side end of the storage chamber (21), the compression element (3) is inserted from the communication hole (25) side.
A diameter-reducing inclined surface (27) is provided so that the lubricating oil at the bottom of the storage chamber (21) is unlikely to leak from the thrust bearing (10) to the compression element (3) side.

The oil supply pump (8) and the oil drain pump (9) each have a cylindrical rotor having eccentric grooves (31a) (31b) on the outer circumferential surface and is fitted into the pump housing (23) to rotate freely. (31) and vanes (81) and (91), the inner surface of the rotor (31) is fitted to the outer periphery of the drive shaft (4) in a relatively non-rotatable manner, and the pump housing (23) is provided with: Two cylinder chambers (32) (33) and discharge oil passages (34) (35) are provided which open into the eccentric grooves (31a) (31b), and the eccentric groove (31b) is provided in the pump housing (23). (31a) and the bottom oil reservoir (1a), and a suction oil passage (37) that opens to the eccentric groove (31b) and the oil receiver (22). , each of the cylinder chambers (32) (33
) are equipped with the vanes (81) and (91), and the tips of these vanes are connected to the eccentric grooves (31a) (3l b).
The drive shaft (4) is driven to rotate the rotor (31), move the vanes (81) and (91), and drain the lubricating oil in the bottom oil reservoir (1a). The oil supply passage (4) of the drive shaft (4) is pumped up from the suction oil passage (36) into the eccentric groove (31a) and is provided to the discharge oil passage (34) and the rotor (31) from the communication passage (31c).
1), and the lubricating oil in the oil receiving portion (22) is pumped up from the suction oil passage (37) into the eccentric groove (3l b) and from the discharge oil passage (35) into the internal space ( 12) to circulate the lubricating oil in the bottom oil reservoir (1a).

The compressor configured as described above uses an external drive source to drive the drive shaft (4
), the oil supply pump (8) and the oil drainage pump (9) are operated.
The lubricating oil supplied to movable parts such as the drive part (5), bearing (6), and thrust bearing (10) through the oil supply passage (41) of the drive shaft (4) by 8) is transferred to the storage chamber (21). It will be returned to.

Therefore, when the drive section (5) rotates, the storage chamber (21)
The lubricating oil returned to the storage chamber moves in the circumferential direction along the peripheral wall surface together with the gas refrigerant in the storage chamber, but this storage chamber (21) is provided with a tapered arcuate inclined surface (26). Therefore, when the drive unit (5) rotates, the drive unit (5)
) The centrifugal force of the fluid consisting of the gas refrigerant and lubricating oil that rotates due to the driving rotation of This centrifugal force acts in the direction toward the communicating hole, and this centrifugal force can move it in the direction of the communicating hole (25), and the inclined surface (26) has a tapered shape. Since the inner diameter increases toward the communication hole (25), the inclined surface (
With the help of the centrifugal force, the fluid flowing through the hole (26) is guided to bend and flow in the direction toward the communication hole (25), and a head difference can be caused by the inclination. Therefore, as a whole, the lubricating oil moving in the circumferential direction can smoothly flow out from the communication hole (25) to the oil receiver (22) in the oil circulation system. Therefore, since the amount of lubricating oil flowing in the circumferential direction along the peripheral wall of the storage chamber (21) is small,
) can reduce stirring of the lubricating oil inside the storage chamber (21),
The load on the drive shaft (4) can be reduced, and the amount of lubricating oil accumulated in the storage chamber (21) can be reduced, so that the lubrication tdI of this storage chamber (2) is equal to that of the thrust bearing (1).
0) to the compression element (3) side can be reduced, and oil leakage can be reduced accordingly.

Furthermore, the lubricating oil that has leaked into the oil receiver (22) is transferred from the suction oil passage (37) to the eccentric groove (3l b) by the oil drain pump (9).
) into the internal space (12) from the discharge oil passage (35).
It is discharged.

In the embodiment described above, the oil drain pump (9) is used to drain the lubricating oil from the oil receiver (22) into the oil reservoir (la). 9) may be omitted, and the structure may be such that the discharge is performed using a balance weight, as in the conventional example shown in FIG.

(Effects of the Invention) As described above, the present invention comprises a first scroll (3a) and a second scroll (3b) on one side of a horizontal casing (1), and a compressor that rotates eccentrically via a drive shaft (4). Element (3
) and supporting the compression element (3).
is provided with a housing chamber (21) for a drive section (5) for eccentrically rotating the compression element (3), and is configured to supply lubricating oil to the drive section (5) and movable parts around the drive section (5). In the horizontal open compressor, the bridge (2) is provided with a communication hole (25) that communicates the bottom of the storage chamber (21) with the oil circulation system for the lubricating oil, and )
A tapered arcuate inclined surface (25) extending in the circumferential direction for a predetermined length starting from the communication hole (25) and increasing in diameter from the compression element (3) side toward the communication hole (25).
26), when the drive unit (5) rotates, centrifugal force due to the rotation of the drive unit (5) acts on the arcuate inclined surface (26), and the centrifugal force is communicated from the compression element side. The lubricating oil of the fluid moving in the circumferential direction can be applied to the communication hole (25
) direction, and furthermore, due to the guiding effect of the tapered arcuate inclined surface (26), the lubricating oil moved by the component force is further moved toward the communication hole (25). It is possible to induce
Moreover, since a head difference can be created in the fluid at the bottom surface, the lubricating oil of the fluid moving in the circumferential direction can flow out from the communication hole (25) to the oil receiver (22) in the oil circulation system. It is possible to do so. Therefore,
Loss of power due to oil agitation in the drive unit (5) can be eliminated, and oil accumulation in the storage chamber (21) can be reduced, so oil does not flow from the storage chamber (21) to the compression element (3) side. The amount can be reduced.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway sectional view of the compressor of the present invention, Fig. 2 is a longitudinal sectional side view of only the frame, Fig. 3 is a longitudinal sectional front view of the compressor, Fig. 4 is a sectional view showing a conventional example, and Fig. 5 is a longitudinal sectional view of the compressor of the present invention. FIG. 6 is a sectional view showing a compressor previously developed by the applicant of the present invention, and is an explanatory diagram showing the state of oil in the storage chamber in FIG. 5. (3)...Compression element (3a)...First scroll (3b)...Second scroll (4)...Drive shaft (5)...Drive section (6) ... Bearing (21) ... Accommodation chamber (25) ... Communication hole (26) ... Arc-shaped inclined surface Fig. 4 Fig. 2 Fig. 3

Claims (1)

[Claims] 1) A first scroll (3) on one side of the horizontal casing (1)
a) and a second scroll (3b), and a drive shaft (4
), the compression element (3) is installed inside the frame (2) that supports the compression element (3).
3) is provided with a storage chamber (21) for a drive part (5) that eccentrically rotates the drive part (5), while supplying lubricating oil to the drive part (5) and movable parts around the drive part (5). A communication hole (25) in the frame (2) that communicates the bottom of the storage chamber (21) with the oil circulation system for the lubricating oil.
is provided at the bottom of the storage chamber (21) for a predetermined length in the circumferential direction from the communication hole (25) as a base point,
A horizontal open compressor characterized in that a tapered arcuate inclined surface (26) is provided whose diameter increases from the compression element (3) side toward the communication hole (25).