JPH02125985A - Scroll hydraulic machine - Google Patents

Abstract

PURPOSE:To improve the lubricating performance of a slide parts of an Oldam's coupling in drive and driven scrolls connected rotatably to each other through the Oldam's coupling, by forming an oil groove and a projecting wall surrounding the oil groove on a casing part close to the coupling. CONSTITUTION:A drive scroll 18 and a driven scroll 21 constituting a compression part in cooperation with the drive scroll 18 are disposed in a lower casing 16 coupled with the lower portion of an upper casing 12 having a motor 11 disposed on the upper portion, and a shaft 21a of the driven scroll 21 is journalled through a bearing 22 by a cover 17 in an eccentric position relative to the axis of the drive scroll 18. Both scrolls 18, 21 are connected rotatably to each other through an Oldam's coupling 24 consisting of an arm 24a and a coupling 24b. Then, a projecting wall 33 close to the coupling 24b is formed while the projecting wall 33 is formed on the inside with a recessed oil groove 34, so that the slide portions of the arm 24a and coupling 24b can be lubricated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a scroll fluid machine used, for example, in a full-system rotary scroll vacuum pump.

[Conventional technology]

Figure 4 is a sectional view showing an example of a conventional scroll fluid machine disclosed in, for example, Japanese Unexamined Patent Publication No. 55-46081. , (2) is a mold disposed within the casing (1), and the rotary shaft (2a) is formed with an oil passage (2b) passing through it in the axial direction, and is located within the lubricating oil α4. (3) is the 7 connected within the casing (1)
A flange (4) is coupled to the flange (3), and a bearing support (5) rotatably supports the rotating shaft (2a).
is a fixed scroll coupled to this bearing support (4), (
6) is an oscillating scroll that eccentrically rotates around the rotating shaft (2a) so as to be able to rotate relative to the fixed scroll (5); (7) is an intake port that communicates with the fixed scroll (5); 8) is an exhaust port for discharging air compressed by the fixed scroll (5) and the oscillating scroll (6); 4) is a return hole that returns the lubricating oil at the top to the bottom.

Next, the operation will be explained.

When the modle (2) is rotated, the oscillating scroll (6) revolves, taking in gas from the intake port (7), compressing the gas in the scroll part, and moving the gas from the exhaust port (8) to the casing (1).
Exhaust outside. The oil stored in the lower part of the casing (1) flows through the oil passage (2b) due to the pressure difference inside the casing (1).
The oil reaches the scroll part through the oil return hole (9) and is returned to its original state while lubricating each part.

[Problem to be solved by the invention]

Conventional scroll fluid machines are constructed as described above, so when this type of fluid machine is used with a vacuum pump, oil is required to prevent gas leakage from narrow gaps and to lubricate oil pans, joints, etc. However, there was a problem in that the structure was complicated, such as by providing an oil passage on the rotating shaft.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a Nuclor fluid machine that has a simple configuration and can easily lubricate joints.

[Means to solve the problem]

The scroll fluid machine according to the present invention includes a driving scroll and a driven scroll arranged vertically eccentrically in a casing, a joint provided at the lower part of the driven scroll, and an arm provided on the driving scroll and connected to the joint. , an oil groove provided on the bottom surface of the casing and proximately facing the joint; and a protruding wall surrounding the oil groove and proximately facing the joint.

An oil sump deeper than the depth of the oil groove is formed on the radially outer side of the protruding wall, and this oil sump is communicated with the oil groove through an oil passage.

Furthermore, an annular guide wall that hangs down into the oil reservoir is formed on the lower surface of the arm.

Furthermore, an oil supply pump is disposed within the casing to supply oil from outside the protruding wall into the oil groove.

[Effect]

In the scroll fluid machine according to the present invention, the protruding wall of the casing and the joint are located close to each other, and the oil in the oil groove is prevented from being shaken off by the rotation of the driven scroll, and the joint and the arm are reliably lubricated.

In addition, the oil groove and oil sump are communicated by an oil passage [7], and when the driven scroll rotates, the oil in the oil groove is blown away into the oil sump, and the oil level in the oil sump is lower than the oil level in the oil groove. The surface becomes higher,
Therefore, oil is circulated in the oil groove through the oil passage, and the oil is reliably supplied to the oil groove.

Furthermore, the annular guide wall that hangs down inside the oil sump prevents the oil that comes over the protruding wall from being thrown away.

It is guided downward and a circulating flow can be reliably formed.

Furthermore, the oil present on the outside of the protruding wall is supplied into the oil groove by the oil supply pump, and the oil can be reliably stored in the oil groove.

[Embodiments of the invention]

FIG. 1 is a partial sectional view showing an embodiment of the present invention, and is a9
is a moder with a rotating shaft (lla) protruding downward.

The rabbit is the upper casing connected to this model α℃,
An exhaust port is attached to one side of the upper outer side, and an intake port 09 communicating with the vacuum container α is attached to the other side. (12a) is a vertical intake passage that is separated from the inside of the upper casing (2) and communicates with the intake port (2) at its upper end and is open at the bottom; αQ is a lower casing connected to the lower part of the upper casing @ , αη is a lower cover coupled to the lower part of this lower casing αQ, (to) is a driving scroll disposed inside the lower casing e, and the shaft portion (
18a) protrudes from the upper casing (2), and a bearing (
1) It is rotatably supported via (c). 31)
is a driven scroll that cooperates with the driving scroll (to), and one shaft portion (21a) is rotatable at a position eccentric to the axis of the driving scroll (to) through a bearing (c) in the lower cover αη. is supported by. (c) is an Oldham joint that rotatably connects the driving scroll (to) and the driven scroll Q11 to each other, and the arm (24a) connected to the driving scroll (c) and the joint connected to the driven scroll 3D. (24b). (c)
is a force ring that connects the rotating shaft (]lla and the shaft part (18a), and also serves as a fan (25 m). (to) is an O-ring that seals between the upper casing (2) and the lower casing part, Intake passage (12a) '/0 ring that separates the upper and upper casing from Yamauchi, 0 ring that seals between the lower casing αG and lower cover 04, and 0 ring that seals between the lower casing αG and lower cover 04. (7) is opened above the oil level. onm is the upper casing (2).
) and lower casing a.
(2) is a protruding wall formed in a cylindrical shape on the bottom surface of the lower cover Qη, facing closely to the joint (24b), and (2) is a concave oil shallowly provided inside this protruding wall (24). It's a groove. (to) is the plug that drains the oil.

In the configuration as described above, moder a1
), the driving scroll (to) rotates, and the driven scroll υ also rotates eccentrically via the Oldham coupling (c), so that the gas at the o-cs pressure of 1 m flows into the exhaust passage (to) from each scroll (to). ) through the upper casing (2
) is discharged within. Therefore, the gas in the vacuum container α4 flows from the intake port (to) to the intake passage (121) → the lower casing αQ
, and is sucked into each scroll (to) QD, and is discharged into the upper casing 0 as described above. The gas in the upper casing (2) is exhausted to the outside through the exhaust port Q3f.

On the other hand, the lubricating oil in the oil tank consisting of the upper casing @ and the lower part of the lower casing αO is supplied into each scroll (to) r2Il by an automatic oil supply device (not shown), which has a lubrication and sealing function. will be fulfilled.

In addition, each scroll (to) is discharged from the exhaust passage together with the lubricating oil and gas that were not supplied inside, but some of the oil remains in the lower casing (9) and is removed from the Oldham joint in the lower casing aΦ. and lubricate the bearings. by the way,
The lubricating oil inside the lower casing aQ.

When the amount increases, it is sucked into each scroll (to) R211, so normally a constant amount is maintained to the extent that Oldham's joint (to) is slightly soaked, but during operation, it is stirred by Oldham's joint (c) and becomes circular. The interior of the lower casing α0 is filled with the oily taste as it is shaken off in the circumferential direction, and the oil adhering to the wall surface flows downward along the wall surface and drips downward.

Further, since the intake passage (12a) is configured vertically, oily taste scattered upward does not reach the intake port (2) and easily falls downward.

By the way, when the lubricating oil stored on the bottom of the lower cover 〇η is stirred by the rotation of the Oldham joint (to), it is thrown away in the circumferential direction. Because of this, lubricating oil remains in the oil groove (to), and since the protruding wall (2) is provided close to the Oldham joint, an oil film is formed between them and the joint (24b) is not shaken off. and the arm (24a).

FIG. 2 shows another embodiment, where (to) is a protruding wall α
A circumferential oil sump located on the outside in the radial direction of 1 and extending deeper than the oil groove (to), (b) is a lower side surface of this oil sump (7) and a lower bottom surface of the oil groove @. It is an oil passage that penetrates the

In this configuration, due to the rotation of the joint (24b) and the arm (24a), the oil level in the oil reservoir (to) becomes higher than the oil level in the oil groove (2), which creates a differential pressure and lowers both oil levels. Since the oil in the oil sump (7) is circulated into the oil groove (to) via the oil passage @ so that the oil is at the same height, oil can be reliably supplied to the oil groove (to).

FIG. 3 shows still another embodiment, in which the arm (24a)
An annular guide wall (to) hangs down from the bottom surface into the oil reservoir (to), and guides the oil coming over the protruding wall (to) downward via the guide wall C@, making it easy to circulate the oil. is formed. In other words, even if the oil in the oil groove (2) is blown away by the arm (24a) or the joint (24b), the oil will fall down on the guide wall (to), and the oil will fall down from the oil sump (7) to the oil passage (rotation). ) - A circulating flow in the oil groove (to) is reliably formed.

FIG. 4 shows yet another embodiment, in which (17a) is an oil passage that opens on the upper surface of the protruding wall □□□ and also opens in the space below the shaft portion (21a);
) is a vertical passage formed eccentrically in the axial direction of the shaft part (2In), and (2]e) is a horizontal passage that communicates with the upper end of this vertical passage (21h) and opens in the radial direction, and together with the vertical passage. It forms an oil supply pump (21d).

In this configuration, when the shaft portion (21a) rotates, the shaft portion (21a) rotates.
The eccentricity of 1a) causes an upward pumping action, and the oil in the space below the shaft (21a) flows into the vertical passage (21b).

The arm (24a) and the joint (2) pass through the horizontal passage (21e).
4b) and is discharged toward the inner end of the oil groove and stored in the oil groove.

On the other hand, the oil in this oil groove leaks outward from the protruding wall (2), lubricating the arm (24m) and the joint (24b), and furthermore, the oil in the oil passage (17a) It is circulated to the space below the shaft portion (21a) through the.

Therefore, not only is oil reliably supplied into the oil groove (to), but also oil is discharged from the oil supply pop (21d) to the arm (24).
m) and the joint (24b) are directly lubricated.

〔Effect of the invention〕

As described above, the present invention includes a driving scroll and a driven scroll arranged eccentrically above and below Cζ in a casing, a joint provided at the lower part of the driven scroll, and an arm connected to the joint provided on the driving scroll. , an oil groove provided in the bottom surface of the casing 17 adjacent to the coupling;
Since a protruding wall surrounding the oil groove and facing the joint in close proximity is provided, the sliding portion between the joint and the arm can be easily and reliably lubricated with a simple structure.

In addition, in the case where an oil reservoir is formed on the radially outer side of the protruding wall and is deeper than the depth of the oil groove, and the oil groove is communicated with the oil groove through an oil passage, the oil level in the oil groove during operation is Utilizing the fact that the oil level in the oil sump is higher than that of the oil sump, the oil in the oil sump can be supplied into the oil groove through the oil passage, which has the effect of reliably securing oil in the oil groove.

Furthermore, if an annular guide wall is formed on the lower surface of the arm that hangs down into the oil sump, the oil that has passed over the protruding wall can be guided downward by the guide wall, thereby improving the circulation flow between the oil sump, oil passage, and oil groove. can be formed reliably, and the sliding portion between the stitcher and the arm can be more effectively lubricated.

Yet again. Since the oil supply pump supplies oil into the oil groove, not only is the oil supply ensured, but the discharged oil also forcibly lubricates the inner ends of the joints and arms, further improving lubrication performance. effective.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the invention, FIG. 2 is a partial sectional view showing another embodiment of the invention, and FIG. 3 is a partial sectional view showing still another embodiment of the invention. FIG. 4 is a partial sectional view showing still another embodiment of the present invention, and FIG. 5 is a sectional view of a conventional device. In the figure, Qυ is the lower casing, aη is the lower cover (17
(m) is the oil passage, (2) is the driving scroll, (2) is the driven scroll, (2] d) is the oil supply pole, (to) is the Oldham joint, (24 &) is the arm, (24b) is the first hand, (to) is the The protruding wall, ■ is the oil groove, ... is the offshore reservoir, @ is the oil passage, and (g) is the guide wall.

Claims (4)

[Claims] (1) A driving scroll and a driven scroll arranged eccentrically up and down in the casing, a joint provided at the bottom of the driven scroll, an arm provided on the driving scroll and connected to the joint, and an arm adjacent to and facing the joint. A scroll fluid machine comprising: an oil groove provided on the bottom surface of the casing; and a protruding wall surrounding the oil groove and facing the joint in close proximity to the joint. (2) An oil reservoir deeper than the depth of the oil groove is formed on the radially outer side of the projecting wall, and the oil reservoir and the oil groove are communicated with each other by an oil passage. scroll fluid machine. (3) The scroll fluid machine according to claim 1, wherein an annular guide wall that hangs down into the oil reservoir is formed on the lower surface of the arm. (4) The scroll fluid machine according to claim 1, further comprising an oil supply pump disposed within the casing for supplying oil from outside the projecting wall into the oil groove.