JPH02230993A - Scroll type fluid device - Google Patents

Abstract

PURPOSE:To improve the lubricating performance at the time of a low-rotation operation and prevent the seizure or the like of a bearing by forming a blade section spattering and feeding a lubricant between a frame and the end plate of a revolving scroll on a balance weight. CONSTITUTION:A blade section 15a provided on a balance weight 15 is immersed end rotated in a lubricant 1 in an oil sump section 11c, thus the blade section 15a rotates the lubricant L in the oil sump section 11c while it is rotated. A centrifugal force is applied by this circulation, the blade section 15a pushes and spatters the lubricant l outward, thus the lubricant L is fed between a revolving scroll 8 and a frame 11 through an outside face 11d. The surrounding of a bearing 17 and an Oldham's coupling is lubricated, and the lubricating performance of a compressor 1 at the time of a low-rotation operation can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a scroll-type fluid device used in a compressor of a refrigeration system, and more particularly to an improvement in its lubrication mechanism.

(Prior Art) Generally, for example, a scroll-type fluid device is used in a compressor in a refrigeration system. , a fixed scroll and a revolving scroll are housed in a sealed casing, and each of the fixed scroll and the revolving scroll has a wrap erected in an involute curve shape on the front surface of an end plate, and the front surfaces of both end plates are opposed to each other. , the two wraps are engaged with each other, the side surfaces of the two wraps are in contact at multiple points, and a compression chamber is formed between the contact portions. Further, a refrigerant outlet is provided approximately in the center of the end plate of the fixed scroll, while the revolving scroll is supported via a bearing on a frame provided on the back side of the end plate, and a refrigerant outlet is provided on the back side of the end plate. A crankshaft to which an electric motor is attached is connected eccentrically to the shaft center, and the revolution scroll is configured to revolve around the fixed scroll without rotating on its own axis due to rotation of the crankshaft, and the compression chamber is contracted. There is.

On the other hand, when this scroll-type fluid device is driven, lubricating oil is supplied to the crankshaft, a support for the revolving scroll, a slide dam joint for preventing the revolving scroll from rotating, and the like. As a means of supplying that lubricating well,
In the case of the low-pressure dome type, a bomb means driven by the rotation of the crankshaft is used to pump up the lubricating well stored at the bottom of the casing from the oil supply passage that penetrates from the lower end surface of the crankshaft to the upper end surface. It is installed near the bottom end of the crankshaft. On the other hand, in the high-pressure dome type, the high-pressure fluid inside the casing acts on the lubricating well at the bottom of the casing, and the lubricating oil is co-supplied to the low-pressure space around the bearing and oil dam joint through the oil supply path inside the crankshaft. is configured to do so.

(Problem to be Solved by the Invention) However, in each of the above-mentioned lubrication means, the lubrication function is performed only when the fluid device is operated at high speed; In the low-pressure dome type, the rotation speed of the bomb means is low, while in the high-pressure dome type, the pressure inside the casing is low during startup, so the lubricating oil at the bottom of the casing is transferred to the bearing and oil dam. There was a problem that a situation occurred where it was impossible to pump water up to the joint, resulting in a decrease in lubrication performance.

Therefore, the present invention forms an annular groove oil reservoir in the frame supporting the revolving scroll, and immerses a balance weight that rotates integrally with the crankshaft in the lubricating oil stored in the oil reservoir. A scroll-type fluid device having a wing section, and a lubrication port of the oil reservoir section is splashed between the frame and the end plate of the revolving scroll by the wing section to lubricate the bearings, oil dam joints, etc. The purpose is to obtain.

(Means for Solving the Problems) In order to achieve the above object, the means taken by the present invention are as follows:
As described below.

First, in the invention recited in claim (1), as shown in FIG.
and a revolving scroll (8), and both scrolls (7) and (8) are formed by having wraps (7b) and (8b) erected in front of end plates (7a) and (8a), respectively. The wraps (7b) and (8b) are meshed and arranged in parallel, and the revolving scroll (8) is attached to a frame (11) fixed to the inner wall of the casing (2) on the back side of the end plate (8a). It is supported on the upper surface via a bearing (17), and a crankshaft (10) is eccentrically connected to the back surface, and by rotating the crankshaft (10), the above-mentioned revolving scroll (8) is connected to the fixed scroll ( 7) It is assumed that the scroll-type fluid device does not rotate on its axis but revolves around it. The upper part of the frame (11) is an annular groove oil reservoir (1 1 ) that stores lubricating oil (L).
c) is formed. On the other hand, the crankshaft (10)
A balance weight (15) is provided at the upper end (10d), and the lower end (10c) is stored in the reservoir (2c) at the bottom of the casing (2) and immersed in the lubrication well (L). The crankshaft (10) has an oil supply path (1
0 e) is formed. Further, the balance weight (15) is immersed in lubricating oil (L) in the oil reservoir (1lc), and the end plate (8a) of the frame (11) and the revolving scroll (8) is immersed in the lubricating oil (L) of the oil reservoir (1lc). ) and the wing section (15) where the lubricating oil (L) is splashed between the
a) is formed and configured.

In addition, in the invention of claim {2, the above claim (
1) In the scroll type fluid device described above, the first
As shown in the figure, the outside side (
1 1 d) is formed of an annular inclined surface inclined outward toward the revolving scroll (8).

In the invention according to claim (3), in the scroll type fluid device according to claim (1) or (2), as shown in FIG.
is composed of a ring-shaped main body (15b) and a wing part (15a), and the ring-shaped main body (15b) is connected to the crankshaft (1
The center of gravity is eccentric from the center of gravity of the crankshaft (10), and the thickness in the radial direction is the same as that of the revolving scroll (8) with respect to the crankshaft center (O2).
) is formed thin on the eccentric side and thick on the anti-eccentric side, while a plurality of the wing portions (15a) are protruded at symmetrical positions on the outer peripheral surface (15c) of the ring-shaped main body portion (15b),
Each wing section (15a) is formed to have the same mass and is formed in a plate shape having a predetermined width in the centrifugal direction of the ring-shaped main body section (15b), and the lower end of the wing section (15a) is connected to the oil reservoir section (1). 1
c) It is immersed in lubricating oil (L).

Furthermore, in the invention as set forth in claim (4), in the scroll type fluid device as set forth in claim (1) or (2), as shown in FIG. 1 5 f) and a wing part (15a), and the ring part (1 5 f) is connected to the crankshaft (10).
It is attached to the upper end portion (10d) and is formed in an annular shape with uniform thickness in the radial direction, while the center of gravity of the balance weight (15) in the wing portion (15a) is eccentric from the center of gravity of the crankshaft (10). The ring part (1 5 f) on the opposite eccentric side of the revolving scroll (8) with respect to the crankshaft center (O2)
A plurality of protrusions are provided on the outer circumferential surface (15c), and each wing portion (
15a) is formed into a plate shape having a predetermined width in the centrifugal direction of the ring part (15f), and the lower end of the wing part (15a) is immersed in the lubricating oil (L) in the oil reservoir part (11c). It is composed of

(effect) The effects of the above configuration will be described below.

First, in the invention as set forth in claim (1), when the crankshaft (10) is rotated, the revolving scroll (8) revolves relative to the fixed scroll (7) as the crankshaft (10) rotates,
For example, the refrigerant is compressed to a high pressure state and discharged into the refrigerant circuit. Further, the balance weight (15) maintains a dynamic balance due to the eccentricity of the orbiting scroll (8) as the crankshaft (10) rotates. And the above crankshaft (
10), a part of the lubricating oil (L) supplied to the bearing (17) etc. is stored in the oil reservoir (1 1 c) formed in the frame (11). When the fluid device is operated at low rotation speed, the lubricating oil (
L) is difficult to supply, but the oil sump (1 1 c)
The lubricating oil (L) stored in the balance weight (1
The lubricating oil (L) is splashed by the wing portion (15a) of 5) and supplied between the revolving scroll (8) and the frame (11), thereby supplying the lubricating oil (L) to the bearing (17) etc. . This improves the lubrication performance of the fluid device during low-speed operation.

In addition, in the invention of claim (2), the oil sump (1)
The outer surface (1 1 d) of 1 c) is the orbiting scroll (
8) Since the lubricating oil (L) is formed with an annular inclined surface that slopes outward toward the side, the lubricating oil (L) is absorbed into the oil reservoir (11c) at the wing section (15a) of the balance weight (15). and is easily supplied between the orbiting scroll (8) and the frame (11) along the inclination of the outer surface (11d), improving lubrication performance.

In the invention as set forth in claim (3), the ring-shaped main body (15b) has a thickness in the radial direction such that its center of gravity is eccentric from the center of gravity of the crankshaft (10).
The eccentric side of the orbiting scroll (8) with respect to O2) is thin,
The anti-eccentric side is formed thicker, and the wing portion (15a)
are protruded at symmetrical positions on the outer peripheral surface (15c) of the ring-shaped main body (15b), so that the ring-shaped main body (15b) takes charge of the dynamic balance of the fluid device, and the lubricating oil (L) ) is caused by the wing part (15a). Therefore, the arrangement position of the wing portion (15a) can be easily set.

Furthermore, in the invention of claim (4), the ring part (
15f) has a circular ring shape with a uniform thickness in the radial direction, and the wing part (15a) has a balance weight (15f).
) are provided on the outer circumferential surface (1 5 c) of the ring portion (15f) so that the center of gravity of the wing portion (15a) is eccentric from the center of gravity of the crankshaft (10).
It has the function of maintaining the na- tion harance only by splashing L). Therefore, the dynamic balance can be finely adjusted by setting the shape, number, etc. of the wing portions (15a).

(Example) Embodiments of the present invention will be described below with reference to the drawings.

As shown in Figure 1, (1) is a scroll compressor;
Used in refrigerators to compress refrigerant gas to high pressure and discharge it.

The scroll compressor (1) has a hermetic casing (2)
A scroll mechanism (3) and a drive mechanism (4) are housed inside, and a suction pipe (5) is connected to the side surface of the sealed casing (2), and a discharge pipe (6) is connected to the top surface. ing. The horizontal scroll machine (3) is composed of a fixed scroll (7) and a revolving scroll (8), and the drive mechanism (4) is composed of an electric motor (9) and a crankshaft (1o). .

The above fixed scroll (7) and revolving scroll (8)
Wrap (7b) on the front of the end plate (7a), (8a)
, (8b) are erected in an involute curve shape,
Both scrolls (7). (8) is the end plate (7a),
(8g) are arranged vertically in parallel with their front faces facing each other, and both wraps (7b) and (8b) are engaged with each other, and both wraps (7b) and (8b) are engaged with each other.
7b). The side surfaces of (8b) are in contact at multiple points, and a compression chamber (3a) is formed between the contact portions, while a refrigerant outlet (7C) is provided in the center of the fixed scroll (7).

Further, the fixed scroll (7) has a flange (7d) connected to the outer peripheral edge of the end plate (7a), and is fixed to the inner peripheral surface of the hermetic casing (2) by the flange (7d), and the hermetic casing ( 2) has two internal spaces (upper and lower) (2a). (2
b). Furthermore, a scroll shaft (8C) is protruded from the back surface of the m-plate (8a) of the revolving scroll (8) concentrically with the center of the revolving scroll (8). Also, the above wrap (7b). (8b) and the flange (7d) of the fixed scroll (7) are provided with a refrigerant suction chamber (14) communicating with the casing internal space.
) is formed.

On the other hand, a frame (11) is fixedly installed in the center of the hermetic casing (2) so as to be located on the back side of the revolving scroll (8), and the crankshaft (10) is mounted on a bearing (12).
) is fitted into the frame (11) in the vertical direction. The crankshaft (10) is a crank main shaft (
An electric motor (9) is attached to the crankshaft (10a), and a connecting portion (10b) is provided eccentrically from the axis (O2) of the crankshaft (10a).
0b) is formed with a scroll shaft fitting hole (10g), and the scroll shaft (8c) is inserted into the fitting hole (10g).
) are fitted, and the scroll shaft (8C) is aligned with its axis (
O1) is arranged eccentrically by a predetermined dimension from the axis (O2) of the crank main shaft (10a).

Furthermore, lubricating oil (
A storage portion (2C) is formed in the crankshaft (10a), while a connecting portion (2C) is formed from the lower end (10c) to the crankshaft (10a).
An oil supply path (10e) is drilled across the bottom of the scroll shaft insertion hole (10g) of 10b), and the bottom of the lower end (10g) is
10c) is immersed in the lubricating oil (L) in the reservoir (2C), and the lubricating oil (L) is supplied around the bearing (12) and the scroll shaft (8C) by an oil supply means (not shown). ing. In addition, the above connecting part (1 0 b)
A branch passage (1 0 f) extending in the radial direction is bored from the outer peripheral surface of the oil supply passage (10e) to the oil supply passage (10e).

The outer periphery of the frame (11) is fixed and supported by the inner circumferential surface of the casing, and the upper surface of the outer periphery is in close contact with the lower surface of the flange (7d) of the fixed scroll (7). A step portion (1 1 a) is formed on the upper surface of the frame (11), and the step portion (1 1 a)
The end plate (8a) of the above-mentioned revolving scroll (8) is mounted on the bearing (1).
7), and the revolving scroll (8) is supported by the frame (11). Furthermore, frame (1
An oil dam joint (not shown) is provided between the stepped portion (1 1 a) of 1) and the end plate (8a) of the revolving scroll (8), and the revolving scroll (8) is connected to the fixed scroll (8).
7) is configured so that it only revolves without rotating. On the other hand, the frame (11) has a stepped portion (
A balancer chamber (1lb) is formed on the centripetal side of 11a), and a balance weight (15) is located within the balancer chamber (11b) and attached to the side surface of the connecting part (10b). .

The oil supply mechanism, which is a feature of the present invention, has a frame (1
In the bottom part of the balancer chamber (llb) of 1),
An oil reservoir (1 1 c) consisting of a circular annular groove concentric with the crankshaft (10) is cut near the outermost periphery thereof. The outer surface (1 1 d) of this ura reservoir (1lc) is formed by an inclined surface that slopes outward toward the revolving scroll (8) side (upwards), while the frame (11) is provided with the above-mentioned branch A lubricating oil suction passage (llf) that extends in the radial direction and communicates with the oil reservoir (1 1 c) is bored at a position corresponding to the passage (1 0 f). On the other hand, the balance weight (15) includes a ring-shaped main body (15b) externally fitted near the upper end of the connecting part (10b), and an oil reservoir part (
The wing portion (1
5a).

As shown in Fig. 2, the main body (15b) has a crankshaft (
10) The thickness in the radial direction is thinner on the eccentric side of the orbiting scroll (8) with respect to the crankshaft center (O2) and thicker on the opposite side to maintain rotational balance when driving the compressor. This is a member that has a balancer function.

On the other hand, the wing parts (15a) protrude from the outer peripheral surface (15c) of the main body part (15b) of the balance weight (15) at two symmetrical positions, extend in the radial direction, and extend from the oil reservoir part (1
1c), and a horizontal blade (15e) extending from the lower end of the vertical blade (15d) toward the downstream side in the rotational direction of the crankshaft (10).

Next, the operation of this device with the above configuration will be explained.

First, when the scroll compressor (1) is driven, the crankshaft (10) rotates as the electric motor (9) is driven, and this rotation causes the revolving scroll (8) to move relative to the fixed scroll (7). It doesn't rotate, it revolves.

The refrigerant sucked into the lower space (2b) of the hermetic casing (2) from the suction pipe (5) is then sucked into the both scrolls (7).
), (8) flows into the compression chamber (3a) formed between the refrigerant, is compressed in the compression chamber (3a), and flows from the refrigerant outlet (7C) of the fixed scroll (7) to the casing (2). After flowing out into the upper space (2a), it is discharged into the refrigerant circuit from the discharge pipe (6).

Due to the rotation of the crankshaft (10) accompanying this drive, the lubricating oil (L) stored in the storage part (2C) passes through the oil supply path (10e) of the crankshaft (10), and a part of it passes through the oil supply path (10e) of the crankshaft (10).
12) to lubricate the area around the bearing (12),
Return to the storage section (2C) again. On the other hand, the oil supply path (1 0 e
A portion of the lubricating oil (L) supplied to the upper end side of the scroll shaft (8C) is flooded around the scroll shaft (8C).
) and the connecting part (10b), the connecting part (10b) is lubricated.
0b) and lubricates the area around the bearing (17) and the oil dam joint by the centrifugal force caused by the rotation of the crankshaft (10). In addition, some other parts are branch roads (1
The lubricating oil is sent from the lubricating oil suction path (1 1 f) to the oil sump (1 1 c).
A predetermined amount is stored. After this predetermined amount of lubricating oil (L) is stored, the lubricating oil (L) is supplied to the oil reservoir (llc).
The oil overflows from above the inner surface (1 1 e) of the oil reservoir (1 1 c) and returns to the reservoir (2C) along the outer peripheral surface of the crankshaft (10).

In this way, lubricating oil (L) is added to the oil reservoir (1 1 c).
), the main compressor (1
) is lowered, the rotation speed of the crankshaft (10) decreases, so the lifting height of the oil supply means decreases,
Although sufficient oil cannot be supplied from the upper end of the connecting part (10b) to the support holder (17), etc., the balance weight (15)
The wing portion (1 5 a) provided in the oil sump portion (1 5 a)
Since the wing part (15a) rotates while being immersed in the lubricating oil (L) in the oil reservoir part (11c)
The lubricating oil (L) of the oil sump (1 1
c) rotate within. This circulation causes centrifugal force to act, and the blades (15a) push away the lubricating oil (L) and splash it outward, causing the lubricating oil (L) to be splashed outward.
L) passes through the outer surface (1 1 d) and the orbiting scroll (8
) and the frame (11), and the bearing (17)
This lubricates the area around the oil dam joint and improves the lubrication performance during low rotation speed operation of the compressor.

In this way, according to the above configuration, the frame (11) and the orbiting scroll (8), which were difficult to supply when the crankshaft (10) rotates at low speed, are removed by using the existing balance weight (15).
), it becomes possible to supply lubricating oil (L) between the two.

(Modified example) Next, a modification of the balance weight will be explained.

What is shown in Fig. 3 is a ring part (1 5 f) with a uniform thickness in the radial direction, and a large number (5 pieces in Fig. 3) of wing parts (15a) of different sizes from the outer circumferential surface (15c) of the ring part (1 5 f). ．． (1
5a)... is provided in a protruding manner.

According to this configuration, the lubricating oil (
Not only is the splashing of the wing part (L) ensured, but also the wing part (1
Since the balance function is achieved by the shape of 5a) and the number of protruding pieces, fine balance adjustment can be easily performed and the function as a balancer can be improved.

In the balance weight (15) shown in Fig. 4, the vertical g (15d) is the crankshaft (
10) is configured to protrude from the outer circumferential surface (15c) so as to be inclined at a predetermined angle on the downstream side in the rotational direction. In this case as well, the lubricating oil (L) in the oil reservoir (1 1 c) is splashed smoothly, and a sufficient river sliding function can be achieved even without providing horizontal blades.

Furthermore, in the balance weight (15) shown in FIG. 3, the balance weight (15) shown in FIG. It has a configuration in which it protrudes from the surface (15c).

Although the above-mentioned compressor is of a low-pressure dome type, it is also possible to apply the compressor to a high-pressure dome type. Additionally, this technology is not limited to scroll compressors;
It can be used as a lubricating means for various fluid devices.

(Effects of the Invention) As described above, according to the present invention, the following effects are achieved.

First, in the invention described in claim (1), when the supply of lubricating oil decreases during low-speed operation, the lubricating oil stored in the oil reservoir is splashed by the blades of the balance weight, and the revolving scroll and By being supplied between the lubricant and the frame, lubricating oil is supplied, which improves the lubricating performance during low-speed operation and prevents seizure of the bearing.

In addition, in the invention described in claim 21, the outer surface of the oil reservoir is formed with an inclined surface facing the support receiver, so that the lubricating oil splashed by the wing portion of the balance weight is formed on the inclined surface. Due to the curved outer surface, the lubrication is easily supplied between the revolving scroll and the frame, and the lubrication performance is improved.

In the invention described in claim (3), the ring-shaped main body has a thickness in the radial direction such that the center of gravity thereof is eccentric from the center of gravity of the crankshaft, and the thickness in the radial direction is thinner on the eccentric side of the revolving scroll with respect to the crankshaft center, and the thickness on the opposite side is thinner. Although it is thick, a plurality of wings protrude at symmetrical positions on the outer peripheral surface of the ring-shaped main body, so that the ring-shaped main body takes charge of the rotational balance of the fluid device and prevents the lubricating oil from splashing. The wing part is involved in the hooking, and the configuration allows easy setting of the placement position of the wing part, making it possible to obtain a balance weight with excellent practicality.

Furthermore, in the invention recited in claim (4), the ring-shaped main body portion is annular with a uniform thickness in the radial direction, and the center of gravity of the balance weight of the wing portion is eccentric from the center of gravity of the crankshaft. By having multiple protrusions on the outer peripheral surface of the ring-shaped main body, the wings not only splash lubricating oil but also contribute to maintaining the rotational balance of the fluid device. By setting the shape, it is possible to finely adjust the rotational balance and reduce vibration and noise accompanying the rotation of the fluid device.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention; FIG. 1 is a longitudinal sectional view of a scroll compressor, and FIG. 2 is a perspective view of a balance weight. Fig. 3 is a perspective view of a balance weight in which the wings have a balance function as a modification of the balance weight, Fig. 4 is a perspective view of a modification of the balance weight shown in Fig. 2, and Fig. 5 is a tjSB diagram. It is a perspective view which shows the modification of the balance weight shown in FIG. (1)...Scroll compressor (2)...Hermetic casing (2C)...Storage section (7)...Fixed scroll (8)...Revolving scroll (7a), (8a) ...End plate (7b), (8b)...Wrap (10)...Crankshaft (10c)...Lower end (10d)...Upper end (10e)...Oil supply path (11 )... Frame (1 1 c)... Oil reservoir (1 1 d)... Outer surface (15)... Balance weight (15a)... Wing part (15b)... Ring shape Main body (15c)...Outer circumferential surface (15f)...Ring part (17)...Bearing (L)...Lubricating oil (O2)...Crank shaft center

Claims (4)

[Claims] (1) A fixed scroll (7) and a revolving scroll (8) are housed in a casing (2), and both scrolls (
7) and (8) are formed by erecting wraps (7b) and (8b) on the front surfaces of mirror plates (7a) and (8a), respectively, and the wraps (7b) and (8b) are meshed with each other so that they are lined up. On the other hand, the revolving scroll (8) is attached to a frame (1) fixed to the inner wall of the casing (2) on the back side of the end plate (8a).
1) is supported on the upper surface via a bearing (17), and a crankshaft (10) is eccentrically connected to the back surface of the rotary scroll (8). In a scroll-type fluid device that revolves around the fixed scroll (7) without rotating, an annular groove oil reservoir (11c) for storing lubricating oil (L) is provided in the upper part of the frame (11). On the other hand, the crankshaft (10) is provided with a balance weight (15) at its upper end (10d), and its lower end (10c) is stored in a reservoir (2c) at the bottom of the casing (2) to store lubricating oil. (
At the same time, the crankshaft (10) is formed with an oil supply passage (10e) that guides the lubricating oil (L) from the reservoir (2c) to the oil reservoir (11c), and the crankshaft (10) is immersed in the balance weight (15). ) is immersed in lubricating oil (L) in the oil reservoir (11c), and the frame (
11) and a wing portion (15a) that sprays and supplies the lubricating oil (L) between the end plate (8a) of the revolving scroll (8) and the end plate (8a) of the revolving scroll (8).
A scroll-type fluid device characterized in that: (2) In the scroll type fluid device according to claim (1), the outer surface (11d) of the oil reservoir (11c) is
A scroll-type fluid device characterized in that it is formed of an annular slope that slopes outward toward the revolving scroll (8). (3) In the scroll-type fluid device according to claim (1) or (2), the balance weight (15) is composed of a ring-shaped main body (15b) and a wing part (15a), (15b) is the crankshaft (10)
It is attached to the upper end (10d), and its center of gravity is eccentric from the center of gravity of the crankshaft (10), and the thickness in the radial direction is thinner on the eccentric side of the orbiting scroll (8) with respect to the crankshaft center (O_2), and on the opposite side to the eccentric side. The wing portion (15a) is formed thickly, while the outer circumferential surface (1
5c), each wing part (15a) is formed to have the same mass and is formed in a plate shape having a predetermined width in the centrifugal direction of the ring-shaped main body part (15b). , a scroll-type fluid device characterized in that a lower end of the wing section (15a) is immersed in lubricating oil (L) in an oil reservoir section (11c). (4) In the scroll type fluid device according to claim (1) or (2), the balance weight (15) is composed of a ring part (15f) and a wing part (15a), and the ring part (15f) is The upper end of the crankshaft (10) (
10d), and is formed into an annular shape with uniform radial thickness, while the wing portion (15a) is attached to the crankshaft so that the center of gravity of the balance weight (15) is eccentric from the center of gravity of the crankshaft (10). The outer circumferential surface (15
c), each wing section (15a) is formed into a plate shape having a predetermined width in the centrifugal direction of the ring section (15f), and the lower end of the wing section (15a) is connected to the oil sump section ( 11c)
A scroll-type fluid device characterized in that it is immersed in lubricating oil (L).