JPH0433998B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a compressor equipped with an oil separation device that separates oil from high-pressure discharged refrigerant passing through a high-pressure chamber provided on the side of a chamber constituting a compression chamber. .

[Conventional technology]

Japanese Patent Publication No. 56-44275 discloses that when compressed refrigerant passes through multiple oil collecting screens installed in parallel to the side wall of the fuselage in a high-pressure chamber attached to the side of the chamber constituting the compression chamber, Separation of oil from refrigerant is shown.

In this oil separation device, although the refrigerant flow path from the compression chamber to the discharge port is relatively long, the opportunity for the refrigerant to come into contact with the oil separation screen is only for a moment, so a sufficient oil separation effect cannot be obtained.

Japanese Utility Model Application Publication No. 55-23410 discloses a system in which a high-pressure chamber is completely filled with a spongy oil separation member, and oil is separated from the refrigerant while the refrigerant passes through the oil separation member.

In this oil separator, the separated oil is recaptured by the refrigerant flow and takes time to reach the lower part of the chamber, resulting in insufficient lubrication of the compressor when the compressor is operated at high speed.

[Purpose of the invention]

The purpose of the present invention is to facilitate the assembly work, to obtain a sufficient oil separation effect in a relatively short refrigerant flow path with reduced flow resistance of the refrigerant fluid, and to enable the separated oil to quickly flow down to the lower part of the chamber. The point is to make it.

[Structure of the invention]

forming a high-pressure chamber separated from a compression chamber by a side portion of the chamber of the present invention, and forming an oil separation chamber and a discharge pressure chamber within the high-pressure chamber by a cup-shaped member fixed to the side wall; The upper part of the compression chamber and the oil separation chamber are communicated through a through hole formed in the side wall, and the cup is connected to the upper part of the oil separation chamber through a refrigerant gas outlet formed below the cup-shaped member in a direction perpendicular to the through hole. A refrigerant gas discharge port is formed above the cup-shaped member in a direction perpendicular to the through hole, and a discharge port is formed in the high-pressure chamber via the discharge pressure chamber. a refrigerant that communicates with the cup-shaped member and forms an annular partition on the inner wall surface of the cup-shaped member, and flows from the through hole toward the refrigerant gas outlet and the refrigerant gas discharge port on the inner wall surface of the cup-shaped member and the outer periphery of the annular partition; A wavy unevenness having a ridgeline extending in a direction perpendicular to the flow is integrally provided, and the inner wall surface of the high pressure chamber has a ridgeline extending in a direction perpendicular to the refrigerant flow flowing from the refrigerant gas outlet and the refrigerant gas discharge port toward the discharge port. It has wavy unevenness integrated into it.

[Embodiments of the invention]

An embodiment in which the present invention is applied to a movable vane compressor will be described below with reference to FIGS. 1 to 7.

In FIG. 1, a compression chamber is formed within a chamber 1. This compression chamber consists of a cam ring 2 and plates 3 attached to both sides of the cam ring 2.
A rotor 4 is arranged in a chamber formed by a and 3b. This rotor 4 has grooves 5 in the radial direction.
A plurality of grooves 5 are formed, and vanes 6 are inserted into the grooves 5. When the drive shaft 7 is rotated, the rotor 4
As the rotor 4 rotates, the space surrounded by the cam ring 2, plates 3a, 3b, rotor 4, and vane 6 in the chamber expands or contracts, and the refrigerant gas sucked in from the suction port 8 is pressurized and the cam ring is rotated. Discharge hole 2a formed in 2 and plate 3
The oil separator 12 is connected to the oil separator 12 through the through hole 3' formed in b.
discharged inside.

A high-pressure chamber 1a is formed in the side portion of the chamber 1, which is separated from the compression chamber by a plate 3b. ,
It is separated into a discharge pressure chamber 9.

The cup-shaped oil separator 12 allows compressed refrigerant gas to pass through the oil separation chamber 12 through the through hole 3a' of the plate 3b.
It flows into the upper part of e at high speed. Oil separation chamber 12e
is wider than the cross-sectional area of through-hole 3a', so through-hole 3a'
The refrigerant gas flowing in from a' expands and slows down. The refrigerant gas that has entered the oil separation chamber 12e is discharged in parallel with the plate 3b and at a low speed by providing a refrigerant gas outlet 12b formed below the oil separation chamber 12e in a direction perpendicular to the through hole 3a'. It becomes a flow.

The inner wall surface of the oil separation chamber 12e is integrally provided with a rectangular wave-shaped unevenness 12f extending in a direction perpendicular to this flow as shown in FIGS. 3 and 4. 12g, due to the difference in specific gravity between the refrigerant gas and the oil, the viscous oil is captured by the tip 12g of this right-angled mountain-shaped convex part, and the viscous oil is trapped in the groove 12h.
The refrigerant gas and oil are separated. At this time,
Since the refrigerant gas flowing inside the oil separation chamber 12e is not blocked by the right-angled mountain-shaped convex portion, the flow resistance of the refrigerant gas is reduced. In addition, as shown in FIG. 3, vortices are generated in the flow of refrigerant at the uneven portions, and the surface area of the refrigerant gas in contact with the inner wall of the separation chamber 12e increases, increasing the chance of oil being captured and increasing the oil separation effect. is expanded. The attached oil flows down vertically through the rectangular wave-shaped recess 12h under the action of gravity to the lower part of the oil separation chamber 12e, and is dripped into the lower part of the high-pressure chamber 1a through the oil return port 12b and collected therein.

On the other hand, the refrigerant gas separated from the oil is stored in the oil separation chamber 1.
Refrigerant gas discharge port 12 provided in the horizontal direction of 2e
c, enters the discharge pressure chamber 9 in the high pressure chamber 1a, and is discharged from the discharge port 10 to the high pressure side piping of the refrigeration cycle.

At this time, the compressed refrigerant that has passed through the oil separation chamber 12e expands again and the refrigerant is further slowed down, so that the oil with a high specific gravity that could not be separated in the oil separation chamber 12e flows under its own weight to the lower part of the high-pressure chamber 1a. Fall.

Since the separated oil has a high rate of dropping directly into the lower part of the high pressure chamber 1a without touching anything, the time required for recovery is much faster than the recovery of oil separated in the oil separation chamber 12e.

Therefore, even if recovery of the separated oil from the oil separation chamber 12e is delayed, such as when the compressor is operated at high speed, the minimum required oil can be covered by the oil separated in the discharge pressure chamber 9.

Conversely, when the rotation of the compressor is low, the flow rate of the refrigerant discharged from the discharge port 12c becomes slow, so that the discharge pressure chamber 9
Although the oil separation effect due to the refrigerant expansion decreases, the oil separation effect here increases because the time it takes for the refrigerant to pass through the separation chamber 12e becomes longer.

In the end, at high speeds, the separation device that recovers the separated oil is more effective, and at low speeds, the separation device with a higher separation effect works, making it possible to perform effective oil separation from low speed to high speed rotation of the compressor. .

In the embodiment, the inner wall surface of the high-pressure chamber 1a is also provided with wavy irregularities so as to separate the oil from the floating refrigerant in the discharge pressure chamber 9.

This is the discharge pressure chamber 9 when the compressor rotates at low speed.
It helps to improve the oil separation effect within.

Furthermore, in the embodiment, an annular partition wall 12p is provided protruding from the center of the cup-shaped oil separator 12, and a wavy unevenness having a ridgeline extending perpendicularly to the refrigerant flow is integrally provided on the outer periphery of the partition wall to form an oil separation chamber. This increases the separation effect within 12e.

Furthermore, an annular groove 12g is carved in the base of the annular partition wall 12p as shown in FIG. Once reached, it helps the fluid flow downwards.

12d is a screw hole for screwing the oil separator 12 to the end surface of the plate 3b.

In FIGS. 1 and 2, reference numeral 5 denotes a hole communicating with an oil supply device 17 for applying back pressure to the back surface of the vane 6 with oil under discharge pressure.

Also, 8 is a refrigerant inlet, 13 is a side cover,
14 is a discharge valve, 15 is a shaft seal, and 16 is an electromagnetic clutch.

A second embodiment of the present invention will be described based on FIGS. 8 and 9.

The second embodiment shows a separator particularly suitable for a so-called two-lobe compressor having two working chambers.

Compressed refrigerant enters the oil separator 12 from two working chambers separated by 180 degrees through respective discharge valves.

The separation chamber 12e of the separator is separated by a partition wall 12j.
It is separated into two chambers 12e' and 12e'', and two independent refrigerant flow paths are formed.

This is effective in equally collecting the oil in each refrigerant discharged from each working chamber of the two-lobe compressor.

Further, in each refrigerant passage, a dividing wall 12i for shunting the refrigerant flow path is provided protruding from the bottom wall surface of the cup-shaped oil separator along the flow of the refrigerant.

The upper and lower surfaces of this wall 12i are also provided with wavy irregularities extending perpendicularly to the flow of the refrigerant.

Therefore, the contact area between the refrigerant and the wall increases accordingly, increasing the separation effect.

A groove 12q' is formed at the upper part of the base of the wall 12i.
This groove 12q' collects the oil separated in the upper channel of the wall 12i. In the upper oil separation chamber 12e', the separated oil collected from both ends of the groove 12q' flows down along the wave-like unevenness, and flows down the chamber through the oil return hole 12b' penetrated at the base of the partition wall 12j. . On the other hand, the lower oil separation chamber 12
In the oil separator 12, the oil is collected in the center of the groove 12q' and discharged to the lower part of the chamber through the oil return hole 12b'' which penetrates the bottom wall of the oil separator 12 at the center of the groove 12q'.

If a large number of oil return holes are provided in the oil separation chamber 12e in the middle of the oil flow path in this way, the separated oil will be discharged from these holes to the discharge pressure chamber in the chamber 1, so that the separated oil in the separation chamber can be recovered quickly. It becomes possible.

Furthermore, in both embodiments, the oil separation chamber 12e has the function of expanding the compressed refrigerant, and therefore also has the function of equalizing pressure pulsations of the compressed refrigerant.

Furthermore, since the refrigerant is expanded again when being discharged into the discharge pressure chamber 9, the pressure pulsations are averaged in the discharge pressure chamber 9 as well, and a discharged refrigerant with extremely little pulsation can be obtained.

In this example, oil separation in the oil separation chamber was performed using a wall surface having wavy irregularities extending in a direction perpendicular to the refrigerant flow, but the invention is not limited to this, and may be performed using a well-known method. It goes without saying that spongy materials, wire mesh, etc. can also be used.

〔Effect of the invention〕

As explained above, according to the present invention, the inside of the high-pressure chamber is partitioned into two spaces by the cup-shaped member attached to the side wall of the chamber, and the oil separation chamber in the cup-shaped member has a high oil separation effect. A ridge line that separates oil and acts at least during high-speed rotation of the compressor in the discharge pressure chamber between the outer wall of the cup-shaped member and the inner wall of the high-pressure chamber and extends in a direction perpendicular to the direction of flow of refrigerant gas containing oil. Since oil separation is carried out using the wave-like unevenness that quickly returns the separated oil to the bottom, assembly work is easy and the flow resistance of the refrigerant gas is reduced. Separation can be performed.

[Brief explanation of drawings]

Figure 1 is a - cross-sectional view of Figure 2 a;
2 is a cross-sectional view showing an embodiment of a compressor with an oil separation device according to the present invention, FIG. 2b is a cross-sectional view taken from FIG. 4 is a sectional view of FIG. 4, FIG. 4 is a front view showing a part of an oil separator according to an embodiment of the present invention, FIG. 5 is a bottom view of FIG. 4, and FIG. 6 is a sectional view of FIG. 4.
7 is a right side view of FIG. 4, FIG. 8 is a drawing showing a part of an oil separator according to another embodiment of the present invention, and FIG. 9 is a view taken along C-D- of FIG. 8. E-F-G-H
FIG. DESCRIPTION OF SYMBOLS 1...Chamber, 9...Discharge pressure chamber, 12...Oil separation chamber, 12a...Compressed refrigerant inlet, 12b, 12b', 1
2b''...Oil return hole, 12c...Compressed refrigerant discharge port, 12
e...oil separation chamber, 12f, 12h...wavy unevenness, 12
i... Refrigerant flow path branch wall, 12q... Groove.

Claims (1)

[Claims] 1. A high-pressure chamber separated from the compression chamber by a side wall is formed on the side of the chamber, and a cup-shaped member fixed to the side wall forms an oil separation chamber and discharge inside the high-pressure chamber. A refrigerant forming a pressure chamber, communicating the compression chamber and an upper part of the oil separation chamber through a through hole formed in the side wall, and forming a refrigerant in a direction perpendicular to the through hole below the cup-shaped member. The cup-shaped member and the discharge pressure chamber are communicated through the gas outlet, and the refrigerant gas is connected to the high-pressure chamber through the discharge pressure chamber and a refrigerant gas discharge outlet formed above the cup-shaped member in a direction perpendicular to the through hole. An annular partition is formed on the inner wall surface of the cup-shaped member and communicates with the formed discharge port, and a refrigerant gas outlet and a refrigerant gas discharge are provided from the through hole on the inner wall surface of the cup-shaped member and the outer periphery of the annular partition. A wavy unevenness having a ridge line extending in a direction perpendicular to the refrigerant flow flowing toward the outlet is integrally provided, and the refrigerant flow flowing from the refrigerant gas outlet and the refrigerant gas discharge port toward the discharge port is perpendicular to the inner wall surface of the high-pressure chamber. A compressor characterized in that a wavy unevenness having a ridge line extending in a direction is integrally provided. 2. The cup-shaped member according to claim 1 is provided with a dividing wall on its inner wall surface that divides the flow path of the refrigerant flow flowing inside the cup-shaped member into a plurality of narrow channels, and the dividing wall A compressor characterized in that a single wave-like unevenness extending substantially perpendicularly to each refrigerant flow flowing through the shunts is provided on the wall surface of the compressor. 3. A compressor according to claim 2, wherein the cup-shaped member is provided with a groove communicating with the refrigerant gas outlet at the upper part of the base of the annular partition wall and at the base of the dividing wall.