JPH01285689A - Oil separating device - Google Patents

Abstract

PURPOSE:To reseparate and remove such as redispersed oil for making it possible to improve oil separation efficiency by providing a partition plate dividing a demister into plural numbers in axial direction, and making a device so that fluid may pass through plural number of demisters. CONSTITUTION:Refrigerant gas separated on oil when passed through a first demister 40a from inside to outside, passes through a second demister 40b from outside to inside and lubricating oil is separated again. And then, while the gas flows from a flow out port 6a to a delivery pipe 6, lubricating oil drips down along a demister 40, flows on the top face of an end plate 11 of a fixed scroll 7 and returns to an oil sump 27 in passing through a recovering passage 29. Because a device is made so as to pass through the demister 40 twice of fluid on dividing the demister 40 into two pieces accordingly, oil separation is performed twice, therefore oil separation efficiency can be improved. Especially, even if oil separated once is dispersed again, the oil can be caught again, therefore delivery oil quantity can surely be reduced, thereby pressure loss due to viscosity of oil can be reduced in piping and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an oil separation device installed in a compressor of an air conditioner, and particularly relates to measures for improving separation efficiency.

(Prior Art) Generally, for example, a scroll type compressor is used as a compressor in an air conditioner, and this scroll type compressor, as disclosed in Japanese Patent Laid-Open No. 56-165788, A fixed frame is provided in the sealed casing and divided into an upper chamber and a lower chamber, and the upper chamber houses a fixed scroll and a revolving scroll, and the lower chamber houses a motor. Both of the above-mentioned scrolls each have wraps erected in an involute curve shape on the front surface of an end plate, so that both end plates are faced to each other, and both wraps are meshed with each other, so that the side surfaces of both wraps are in multi-point contact, and between the contacts. A closed chamber is formed. Further, the above-mentioned revolving scroll is supported by connecting the crankshaft of a motor passing through the fixed frame to the back of the end plate, and the support center of the revolving scroll is provided eccentrically from the crankshaft center, and the revolution of the revolving scroll is caused by the rotation of the crankshaft. revolves around the fixed scroll without rotating, and the sealed chamber is configured to contract, for example.

Therefore, refrigerant gas is introduced from the side of the fixed scroll into the sealed chamber between the two wraps, and after being compressed, it is discharged from the center of the fixed scroll into the upper chamber, and from the upper chamber, it is discharged outside the case through the lower chamber. has been done.

In this scroll type compressor, the amount of lubricating oil contained in the discharged refrigerant gas is larger than that in a reciprocating type compressor, so if the lubricating oil is discharged as it is, the pressure loss in the piping and heat exchanger will be large. . Therefore, an oil separation element is provided in the upper chamber to separate and remove the lubricating oil from the refrigerant gas.

(Problems to be Solved by the Invention) In the above-mentioned scroll type compressor, the oil separation elements are provided in only one layer, approximately evenly spaced, and are designed to separate oil from the refrigerant gas when the refrigerant gas passes therethrough.

However, since the oil separation element has a single layer, the refrigerant gas passes through the oil separation element only once, and there is a problem that the oil cannot be sufficiently separated and removed.

In particular, in areas where the flow rate of refrigerant gas is high, the separated oil will be re-splattered and discharged, resulting in poor oil separation efficiency and high pressure loss due to the viscosity of the oil in pipes, etc. . Furthermore, since a large amount of the lubricating oil is discharged, there is a problem in that the lubricating oil in the compressor decreases, resulting in a lack of reliability.

The present invention has been made in view of the above-mentioned problems, and allows the fluid to pass through the demister multiple times to separate and remove re-splattered oil, etc., thereby improving the oil separation efficiency and improving the efficiency of the compressor. The purpose is to improve the reliability of

(Means for Solving the Problem) In order to achieve the above object, the means taken by the invention according to claim (1) are as shown in FIG.
) is opened with a fluid inlet (21) and an outlet (6a), and a cylindrical demister (40) for separating oil in the fluid from the fluid is provided in the case (2). At least one end is provided in contact with the periphery of the inlet (21). Furthermore, the above fluid is transferred to the demister (40).
4o) is provided with a partition plate (41) that divides the demister (40) into a plurality of pieces in the axial direction.

Further, the means taken by the invention according to claim (2) is that the demister (40) is provided with one end in contact with the periphery of the inflow port (21) and the other end in contact with the periphery of the outflow port (6a). The plate (42) is formed into a flat plate larger in cross section than the demister (4o), and the demister (40) is connected to the first demister (40a) on the inflow side and the second demister (40a) on the outflow side.
(b) and are interposed in the demister (40).

Further, the means taken by the invention according to claim (3) is that the demister (43) is provided with one end in contact with the periphery of the inflow port (21) and the other end in contact with the periphery of the outflow port (6a). The first partition plate (44) and the third partition plate (46) are formed into a flat plate larger than the cross section of the demister (43), and the third partition plate (46) is formed into a donut shape and has an outer peripheral surface in contact with the case (2). In addition, a second partition plate (
45), and each partition plate (44), (4
5) and (46) are arranged at a predetermined interval, and the demister (43)
) is divided into a first demister (43g), a second demister (43b), a third demister (43c) and a fourth demister (43d) from the inlet (21) side to form the demister (43).
It is constructed by intervening.

(Function) With the above configuration, in the invention according to claim (1), for example, compressed refrigerant gas compressed by the scroll compressor (1) flows into the oil separation chamber (2a) from the inlet (21),
The oil flows inside the oil separation chamber (2a) toward the outlet (6a). At that time, the demister (40) is connected to the partition plate (41
), it passes through each of the divided demisters (40a) and (40b) in sequence. For example, in the invention of claim (2), after passing through the first demister (40a) from the inside to the outside, the second
It passes through the demister (40b) from the outside to the inside and is discharged from the outlet (6a). Further, in the invention of claim (3), after passing through the first demister (43a) from the inside to the outside and passing through the second demister (43b) from the outside to the inside, the second partition plate (45 ), passes through the third demister (43c) from the inside to the outside, and then communicates with the fourth demister (43d) from the outside to the inside, and then is discharged from the outlet (6a). Become. Then, the oil in the refrigerant gas is removed from each demister (43
g), (43b), (43c).

(43d).

(Effect of the invention) Therefore, according to the oil separation device of the invention according to claims (1) to (3), the demister (40) is divided into a plurality of parts so that the fluid passes through the demister (40) a plurality of times. Because of this,
Since oil separation is performed multiple times, oil separation efficiency can be improved. In particular, even if the oil that has been separated once is scattered again, it can be captured again, so the amount of discharged oil can be reliably reduced, and pressure loss due to oil viscosity in piping etc. can be reduced. . Furthermore, the compressor (
1) Since it is possible to prevent the lubricating oil from decreasing inside, etc., reliable bearings can be carried out, and reliability can be improved.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 and 2, (1) is a scroll type compressor, which is used in a refrigerator to compress refrigerant gas to high pressure and discharge it.

The scroll compressor (1) is constructed by housing a scroll mechanism (3) and a drive mechanism (4) in a sealed case (2), and a suction pipe (5) is installed on the side of the case (2). )but,
A discharge pipe (6) is connected to the upper part. The scroll mechanism (3) includes a fixed scroll (7) and a revolving scroll (8), and the drive mechanism (4)
is composed of an electric motor (9) and a crankshaft (10).

The fixed scroll (7) and the revolving scroll (8) have a wrap (13) on the front surface of the end plate (11), (12).
(14) are erected in an involute curve shape, and both scrolls (7) and (8) are connected to end plates (11) and (
12) are arranged vertically in parallel with their front faces facing each other, and both wraps (
13) and (14) are meshed. The fixed scroll (7) has a flange (
The inside of the case (2) is a high pressure chamber above a fixed scroll (7), an oil separation chamber (2a) described below, and an oil separation chamber (2a) below. It is divided into a low pressure chamber (2b). Further, a scroll shaft (12a) is protruded from the central part of the back surface of the end plate (12) of the revolving scroll (8), while the case (
2) has a support frame (10) for the crankshaft (10).
15) is fixedly installed, and the support frame (15) is provided with a communication port (15a) that communicates with the top and bottom, and the crankshaft (10) is inserted into the top and bottom of the support frame (15) through the bearing metal (16). has been done. The crankshaft (10) is a crank main shaft (10a) that passes through the support frame (15).
) is connected to a boss (10c) having a concave scroll bearing hole (10b) at the upper end of the crankshaft (10b).
The electric motor (9) is attached to the scroll bearing hole (10b), and the scroll bearing hole (10b) is provided so that its bearing center (01) is eccentric from the axis (0) of the crank main shaft (10a). 10b) is fitted with the scroll shaft (12a) of the revolving scroll (8).Furthermore, a guide is provided between the outer peripheral surfaces of the end plates (11) and (12) in both the scrolls (7) and (8). A plurality of spheres (17) are provided through the circular groove, the spheres (17)
Accordingly, the above-mentioned revolving scroll (8) is prevented from rotating and revolves relative to the fixed scroll (7) due to the eccentricity of the scroll bearing hole (10b).

Both wraps (13) and (14) of the fixed scroll (7) and the revolving scroll (8) are in multi-point contact on the sides (18)
each wrap (13),
The end face of (14) contacts the other end plate (12), (11), and a sealed chamber (19) is formed between the contact (18). In addition, the flange (11) of the fixed scroll (7) is
a) is provided with an inlet (20) extending from the inner surface to the lower surface, and an inlet (21) into the oil separation chamber (2a) is provided in the center of the end plate (11). ) so that fluid is supplied to the closed chamber (19).

Further, on the back side of the end plate (12) of the revolving scroll (8), a donut-shaped fixed frame (22) fixed to the case (2) is formed parallel to the end plate (12). A through hole (22a) is bored in the outer peripheral part of the fixed frame (22), and a boss (10c) of the crankshaft (10) is fitted in the center part through a bearing metal (23). . Further, a chip seal (31) is provided on the inner peripheral upper surface of the fixed frame (22) outside the stepped portion (24) via a seal groove (32), and the chip seal (31)
A back pressure chamber (25) is formed inside. Although not shown, the back pressure chamber (25) is communicated with a high pressure sealed chamber (19), into which high pressure refrigerant gas is introduced, and the revolving scroll (8
) is pressed toward the fixed scroll (7). Also, on the outside of the tip seal (31), there is an end plate (12) of the revolving scroll (8) and a fixed frame (22).
A suction passage (26) is formed by the gap between the suction port (20) of the fixed scroll (7) and the fixed frame (2).
2) is communicated with the through hole (22a).

Furthermore, there is a lubricating oil reservoir (
27) is formed, while the crank main shaft (10a)
An oil supply passage (10d) is drilled therein, and the lower end is immersed in lubricating oil in the oil reservoir (27), and the lubricating oil is applied to the bearing metal (16).

(23). Further, a balancer chamber (28) is formed between the support frame (15) and the fixed frame (22), and the balancer (10e) is located in the balancer chamber (28) so that the balancer (10e) is connected to the crankshaft (10).
The balancer (10c) is connected to the boss (10c) of the balancer (10c).
By rotating e), mist-like lubricating oil in the refrigerant gas that has been exposed to the communication port (15a) collides with the side wall, causing the oil sump (2) to collide with the side wall.
7).

Next, as a feature of the present invention, the oil separation chamber (2a) is provided with a demister (40) to separate lubricating oil contained in the refrigerant gas from the refrigerant gas.

An inlet (21) formed in the fixed scroll (7) is opened at the center of the lower surface of the oil separation chamber (2a), while a discharge pipe connected to the case (2) is located at the center of the upper surface. The end face of (6) is opened concentrically with the inlet (21) and constitutes an outlet (6a).

The demister (40) is formed in a cylindrical shape and is provided from the upper surface to the lower surface of the oil separation chamber (2a), and its lower end is connected to the inlet (21) on the upper surface of the end plate (11) of the fixed scroll (7). ), and the upper end thereof is connected to the periphery of the outlet (6a) on the upper surface inside the case (2), respectively. Further, the demister (40) is provided with a partition plate (41), which divides the refrigerant gas into the demister (40a) and the second demister (40b) in the axial direction (vertical direction). 40) twice.

The partition plate (41) is formed into a disc shape with the same diameter as the outer diameter of the demister (40) and the same shape as the cross section.
The inside of the demister (40) is divided into upper and lower parts, and the first demister (40) on the inlet (21) side
40a) and the second demister (40b) on the outlet (6a) side
is formed. Then, the first demister (40a
) allows the refrigerant gas to communicate from the inside to the outside, and the second demister (40b) allows the refrigerant gas to pass from the outside to the inside to separate the lubricating oil.

In addition, a recovery passageway (
29) is open at the upper end, and the recovery passageway (29) is formed by passing through the fixed scroll (7), the fixed frame (22), and the support frame (15) in this order, and is The separated lubricating oil is returned to the oil reservoir (27).

Note that (33) is a check valve that opens and closes the inlet (21), and is provided on the fixed scroll (7) via a support member (34).

Next, the operation of this scroll compressor (1) will be explained.

First, refrigerant gas flows into the case (2) from the suction pipe (5), passes through the air gap of the electric motor (9) in the low pressure chamber (2b), and enters the communication port (15a) of the support frame (15).
), the balancer chamber (28), the through hole (22a) of the fixed frame (22), and the suction passage (26), and are introduced into the sealed chamber (19) from the suction port (20) of the fixed scroll (7).

On the other hand, the revolving scroll (8) rotates eccentrically due to the rotation of the crankshaft (10), revolves around the fixed scroll (7) without rotating, and the sealed chamber (19) has both wraps (13) and (14). ) are sequentially formed and contracted. Then, the refrigerant gas introduced into the sealed chamber (19) is compressed,
The oil separation chamber (
2a).

The refrigerant gas flowing into this oil separation chamber (2a) has a case (
2), the refrigerant gas first flows into the first demister (40a), and the upper surface of the first demister (40a) is blocked by the partition plate (41). Therefore, the lubricating oil in the refrigerant gas is separated by passing through the first demister (40 g) from the inside to the outside.

Thereafter, the refrigerant gas flows through the outlet (6a) to the second demister (
40b), the second demister (40b) is opened into the second demister (40b).
b) from the outside to the inside, and the lubricating oil is separated again. The refrigerant gas from which the lubricating oil has been separated flows from the outlet (6a) to the discharge pipe (6), while the lubricating oil drops through the demister (40) and flows over the upper surface of the end plate (11) of the fixed scroll (7). , it returns to the oil sump (27) through the recovery passageway (29).

Therefore, since the demister (40) is divided into two parts so that the fluid passes through the demister (40) twice, oil separation is performed twice, so that the oil separation efficiency can be improved. In particular, even if the oil that has been separated once is scattered again, it can be captured again, so the amount of discharged oil can be reliably reduced, and pressure loss due to oil viscosity in piping etc. can be reduced. . Furthermore, since it is possible to prevent the lubricating oil in the scroll compressor (1) from decreasing, reliable bearings can be achieved, and reliability can be improved.

3 to 5 show other embodiments, and the one shown in FIG. 3 is one in which the partition plate (42) is formed to have a large diameter. In other words, instead of the partition plate (41) in the previous embodiment having the same shape as the cross section of the demister (40), the partition plate (41) has a larger diameter than the outer diameter of the demister (40) and a larger cross section than the demister (40). It is formed in the shape of a disc. The partition plate (42) has a flange (42a) whose outer periphery protrudes from the demister (40).
The refrigerant gas that has passed through the first demister (40a) is rectified and guided to the second demister (40b).

Therefore, the refrigerant gas that has passed through the first demister (40a) is transferred to the second demister (40a) which is close to the first demister (40a).
b) without concentrating on the lower part of the second demister (40b).
) will be distributed throughout the entire area and pass through. As a result, the lubricating oil is separated by the entire demister (40), and the separation efficiency is further improved.

In the embodiment shown in FIG. 4, the demister (43) is divided into four parts instead of the demister (40) of the previous embodiment, which is divided into two parts. In other words, the demister (43) has three first partition plates (44), a second partition plate (45), and a third partition plate (46).
) are interposed at a predetermined interval, and are divided into four in the axial direction, and the first demister (43g) and the second demister are separated from the inlet (21) side.
It is composed of a demister (43b), a third demister (43c), and a fourth demister (43d). The first partition plate (44) is provided on the inlet (21) side, the third partition plate (46) is provided on the outlet (6a) side, and the second partition plate (45) is provided on the first and second partition plates (45). 3 partition plates (44), (46
) is provided approximately in the center between the two. Further, the first and third partition plates (44) and (46) are formed into a disk shape larger than the cross section of the demister (43), and the outer circumferential portion protrudes from the demister (43) to prevent refrigerant gas. The flanges (44g) and (46a) are formed to rectify the flow.

On the other hand, the second demister (45) is formed in a donut shape, the outer peripheral surface is connected to the side surface of the case (2), and the inner peripheral surface has an opening ( 45a), and the refrigerant gas is configured to flow through the opening (45m).

Therefore, the refrigerant gas flowing in from the inlet (21) first passes through the first demister (43a) from the inside to the outside.
After the second oil separation is performed, the second demister (43b) is passed from the outside to the inside to perform the second oil separation. Thereafter, the refrigerant gas passes from inside the second demister (43b) through the opening (45g) of the second partition plate (45) to the third demister (
43c) and passes through the third demister (43c) from the inside to the outside to perform the third oil separation.

Next, the refrigerant gas is communicated from the outside to the inside through the fourth demister (43d), and after the fourth oil separation is performed, the refrigerant gas is passed through the outflow port (43d).
6a) will flow out more.

Therefore, since the refrigerant gas passes through the demister (43) four times, the lubricating oil can be separated more reliably.

In the embodiment shown in FIG. 5, instead of dividing the demister (43) into four in the previous embodiment, the fourth demister (43d) is omitted and the demister (47) is divided into three. In other words,
The demister (47) is provided so that its upper end is located near the top surface of the case (2) and is spaced from the top surface of the case (2) by a predetermined distance.As in the previous embodiment, the demister (47) is provided with three first partition plates (
44), a second partition plate (45), and a third partition plate (46). The third partition plate (46) is provided on the upper surface of the demister (47) to close the upper surface, and the first and second partition plates (44).

(45) are interposed in the demister (47) at a predetermined interval, and the demister (47) is connected to the first demister (47a), the second demister (47b) and the third demister (47) from the inlet (21) side. (47c), each of the above-mentioned partition plates (44) and (45).

(46) is formed similarly to the previous embodiment.

On the other hand, the outlet (6a') is opened at the upper side surface of the case (2).

Therefore, the refrigerant gas is transferred to the first demister (
47a), second demister (47b) and third demister (
47c), the lubricating oil is separated, and the lubricating oil passes through the outlet (6
a'). In particular, since the discharge pipe (6) is provided on the side surface of the case (2), the piping space can be saved.

In each of the above embodiments, the oil separation chamber (2a) is formed integrally within the scroll compressor (1), but it may be formed independently as an oil separation device.

Further, the demister may be divided into five or more parts so that the refrigerant gas passes through the demister five times.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a scroll compressor, and FIG. 2 is an enlarged cross-sectional view of the same essential parts. 3 to 5 show other embodiments, and FIGS. 3, 4, and 5 are enlarged sectional views corresponding to FIG. 2, respectively. (1)...Scroll type compressor, (2)...Case, (2a)...Oil separation chamber, (6)...Discharge pipe, (6
a). (6a')...Outlet, (7)...Fixed scroll, (8)...Revolving scroll, (21)...Inflow port, (29)...Recovery passage, (40), (43),
(47)...Demister, (40a), (43
a), (47a)--first demister, (40b
), (43b). (47b)...Second demister, (43c), (47C
)...Third demister, (43d)...Fourth demister, (41), (42), (44), (45), (46)
...Partition plate, (42a), (44a), (46a
)...Flange, (45g)...Opening.

Claims (3)

[Claims] (1) A fluid inlet (21) and an outlet (6a) are opened in the case (2), and a cylindrical pipe is provided in the case (2) to separate oil in the fluid from the fluid. Demister (4
0) is provided with at least one end in contact with the periphery of the inlet (21), while the demister (40) is provided with a demister (40) such that the fluid passes through the demister (40) multiple times.
40) into a plurality of parts in the axial direction. (2) The demister (40) is provided so that one end is in contact with the periphery of the inlet (21) and the other end is in contact with the periphery of the outlet (6a), while the partition plate (42) is provided across the demister (40). The demister (4
0) on the first demister (40a) on the inflow side and the second demister (40a) on the outflow side.
The demister (40b) is divided into the demister (40b) and the demister (40b).
2. The oil separation device according to claim 1, wherein the oil separation device is interposed in the oil separation device. (3) The demister (43) has one end in contact with the inlet (21) and the other end in contact with the outlet (6a), and is a flat plate larger than the cross section of the demister (43). The first partition plate (44) and the third partition plate (4
6) is formed into a donut disk shape and the outer peripheral surface is the case (2).
), and a second partition plate (45) whose inner peripheral surface is smaller than the cross section of the demister (43) is provided, and each of the partition plates (44), (45), and (46) is spaced at a predetermined interval. The demister (43) is divided from the inlet (21) side into a first demister (43a), a second demister (43b), a third demister (43c), and a fourth demister (43d). The oil separation device according to claim (1), characterized in that the oil separation device is installed in (43).