JP2002285984A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas compressor, capable of improving heat exchange efficiency of an air conditioner by efficiently recovering oil from compressed gas in a discharge chamber to an oil reservoir for reducing quantity of oil mixed in compressed air sent out to outside of a compressor, and of reducing quantity of enclosed oil. SOLUTION: A star-shaped polygon prism or petal shaped polygonal prism rough grid wall body 21 is locked between a compressed air discharge passage outlet 9a and a discharge chamber 10 inner wall. Compressed air, discharged from a discharge passage 9, collides with the rough grid wall body 21 and repeats collisions, while being bounced back from the rough grid and changing direction. Oil drops in compressed gas are captured by the grid during collision and drop in the oil reservoir 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor using a rotary vane type lubricating refrigerating machine oil used in an air conditioner system.

[0002]

2. Description of the Related Art In a gas compressor using lubricating refrigerating oil, which is used in an air conditioner system, it is inevitable that the oil is mixed into the air conditioner system and circulated. However, if oil circulates in the air conditioning system, the amount of heat exchange in the heat exchanger in the system will be lost by the amount of oil mixed in, and the cooling capacity will decrease,
Conventionally, various techniques for reducing the amount of oil circulation have been used.

FIG. 4 shows an example of a rotary vane type gas compressor to which a conventional oil mixing prevention measure is applied.

[0004] In the gas compressor of FIG. 4, the rotor 2 of the compressor body 1 rotates in the cylinder block 3. The rotation of the rotor 2 causes the vanes 4 provided around the rotor 2 to rotate.
Are in sliding contact with the inner wall surface of the cylinder block 3 and the inner wall surfaces of the side blocks 5 and 6 and rotate about the rotor axis. As a result, a plurality of compression chambers formed by partitioning the rotor 2, the cylinder block 3, the vanes 4, and the side blocks 5, 6 repeat expansion and contraction sequentially. Due to the expansion and contraction, a gas (refrigerant gas) is sucked and compressed from the suction port 7 to the compression chamber of the compressor body 1 via the suction chamber 8, and is discharged to the discharge chamber 10 via the discharge passage 9. Further, the compressed gas is discharged from the discharge chamber 10 to the external air conditioning system via the discharge port 11.

The compressor body 1 has a sliding surface between the rotor 2 and the vane 4, a sliding surface between the vane 4 and the cylinder block 3, side blocks 5 and 6, and mechanical sliding such as bearings 12 and 13 of the rotor 2. There are moving parts, and these sliding parts of the compressor body 1 are supplied with refrigerator oil.

The refrigerating machine oil is stored in an oil sump 14 formed at the bottom of the discharge chamber 10, and the oil is supplied through the oil supply path 15 by the pressure in the discharge chamber 10 via the oil supply path 15. It is supplied to the sliding part and lubricates the sliding part. Further, this oil is also used for applying a pressing force for pressing the vane 4 to the cylinder block 3.

[0007] The oil used in the compressor body 1 mixes with the gas in the compression chamber, and is discharged together with the compressed gas into the discharge passage 9.
, And is discharged into the discharge chamber 10, but passes through the oil separator 16 attached to the outlet of the discharge passage 9 on the way. The oil separator 16 has a cylindrical shape in which a wire mesh is spirally wound. The compressed gas discharged to the wire mesh collides and the oil is separated as oil droplets, and the oil droplets drop into the oil reservoir 14 and are collected.

The compressed gas that has passed through the oil separator 16 contains
Although some oil that could not be separated remains, as the compressed gas diffuses in the discharge chamber 10 and the flow velocity decreases,
Oils having a specific gravity greater than that of gas are combined with each other to form oil droplets, which are dropped into the oil sump 14 and separated.

In FIG. 4, reference numeral 17 denotes a case which covers the cylinder block 3 and the side blocks 5 and 6 and forms the discharge chamber 10 therein. Suction chamber 8
Is an electromagnetic clutch which is attached to the front head 18 and turns on / off the transmission of rotational power between the rotor 2 and the pulley 20.

In addition to the example shown in FIG. 4, a jet of compressed gas is caused to collide with a wall perpendicular to the jet, such as a baffle plate or a wall surface in a discharge chamber, so that the flow velocity is reduced and oil adheres to the wall surface. Oil separating means for separating oil is also known.

However, during high-speed operation or when the discharge chamber volume is relatively small, the flow velocity of the compressed gas in the discharge chamber does not slow down, and of course, the oil still mixed after passing through the oil separator,
Oil that has once turned into oil droplets may be entrained in the jet of compressed gas before reaching the oil reservoir, and may be carried from the discharge port to an external air conditioning system as oil droplets.
In such a case, the system circulation amount of oil does not decrease,
This hinders heat exchange and leads to a shortage of lubricating oil.

[0012]

SUMMARY OF THE INVENTION According to the present invention, an oil is efficiently recovered from compressed gas in a discharge chamber to an oil reservoir, and the amount of oil mixed in the compressed gas sent out of the compressor is reduced. An object of the present invention is to provide a gas compressor which can increase the heat exchange efficiency and requires a small amount of oil.

[0013]

In order to solve the above-mentioned problems, a gas compressor according to the present invention sucks gas from a suction port and compresses the gas, and discharges the gas from the compressor body. A discharge passage through which the compressed gas passes, a discharge chamber provided on the outlet side of the discharge passage, and a discharge chamber,
An uneven mesh wall body that is disposed in contact with a wall surface at the outlet of the discharge passage, applies oil in the discharged compressed gas to the wall surface to make oil droplets, and an oil reservoir that collects the oil droplets to be dropped,
An oil supply path for supplying oil from the oil reservoir to the compressor body, and a discharge port for discharging gas separated from the oil by the uneven mesh wall body to the outside are provided.

Further, in the above invention, the uneven mesh wall divides the discharge chamber up and down at least near the outlet of the discharge passage.

Further, in the above invention, the uneven mesh wall is a star-shaped polygonal wall or a fly-shaped polygonal wall.

Further, in the above invention, the uneven mesh wall is locked between the inner wall of the discharge chamber and the outlet of the discharge passage.

Further, in the above invention, one of the concave wall portions of the uneven mesh wall is made to face the outlet of the discharge passage.

In the above invention, at least one convex wall portion of the uneven mesh wall is directed downward, and an oil droplet receiving wall is provided immediately below the downward convex wall portion. To do.

Further, in the above invention, the uneven mesh wall is formed in a plurality of layers.

[0020]

Embodiments of the present invention will be described below.
This will be described with reference to FIGS.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, an uneven mesh wall 21 is interposed and locked between the outlet 9a of the discharge passage 9 and the protrusions 10a, 10a of the discharge chamber wall in the discharge chamber 10. In this embodiment, the uneven mesh wall 21 has a cylindrical or box-like shape in which a metal plate having a large number of fine punch holes is formed on a curved surface having deep unevenness.

One of the concave wall portions 21a of the irregular mesh wall 21 is arranged to face the outlet 9a of the discharge passage. Further, at least one convex wall portion 21b of the uneven mesh wall 21 is arranged downward.

That is, the uneven mesh wall 21 is formed in the discharge chamber 1.
Within zero, occupies a larger volume than conventional oil separators,
The discharge chamber 10 is vertically divided near the outlet 9a of the discharge passage.

Immediately below the downward convex wall portion 21b, an oil droplet receiving wall 22 is formed so as to protrude from the discharge chamber wall surface.

Next, the state of oil separation in the gas compressor of FIG. 1 having the above configuration will be described.

The jet of the oil-mixed compressed gas discharged from the compressor body 1 into the discharge passage 9 first collides with the concave wall portion 21a of the uneven mesh wall 21, and most of the jet flows from the punch holes in the wall. Pass through the mesh. Part of the mixed oil is trapped as oil droplets in the mesh of the punch holes on the wall surface and separated from the gas.

The gas jet that has passed through the mesh is slightly diffused here, enters the uneven mesh wall 21, and collides with the further wall. Since the wall has deep irregularities, the angle of incidence of the jet with respect to the wall is not constant, and the jet rebounds in various directions, intersects each other in the irregular mesh wall 21, and the flow velocity gradually decreases. Hit the wall many times,
Oil is caught in the mesh one after another. The oil droplets trapped in the mesh on the wall surface aggregate along the wall surface due to surface tension or gravity, gather at the tip of the downward convex wall portion 21b, fall on the oil droplet receiving wall 22, and fall on the oil droplet receiving wall. Oil pool 1 from 22
4 and collected.

From above the uneven mesh wall 21, a compressed gas from which oil has been sufficiently separated flows out to the discharge port 11 side.

In this embodiment, since the uneven mesh wall 21 is locked between the inner wall of the discharge chamber 10 and the outlet 9a of the discharge passage, the uneven mesh wall 21 is stable against severe collision of compressed gas. Will be held. Further, since one of the concave wall portions 21a of the uneven mesh wall is disposed so as to face the outlet 9a of the discharge passage, the directions of collision and rebound of the compressed gas become almost symmetrical, and the compressed gas is diffused evenly throughout. Thus, the oil trapping efficiency is good, and the holding of the uneven mesh wall 21 is stable against the collision of the compressed gas.

Also, since at least one convex wall portion 21b of the uneven mesh wall 21 is disposed downward, oil droplets captured by the uneven mesh wall 21 collect on the convex wall portion 21b, and large oil droplets are formed. And drop quickly.

Since the oil droplet receiving wall 22 is provided directly below the downwardly protruding wall surface portion 21b, the oil is repelled by large oil droplets falling directly into the oil reservoir 14 or sneaking in compressed gas. No secondary oil mixing due to oil splashing is prevented.

FIG. 2 is a cross sectional view showing another embodiment of the present invention. 2, the same parts as those in FIGS. 1 and 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The gas compressor shown in FIG. 2 has a narrow discharge chamber due to its design, and the compressed gas flow in the discharge chamber hardly stays due to a reduced flow velocity, and flows to the discharge port side. To go. Therefore, in this type of gas compressor, the oil in the compressed gas is less likely to be separated as oil droplets, and the oil droplets are again entrained in the compressed gas flow and flow toward the discharge port. It is easy.

In FIG. 2, the outlet 9a of the discharge passage is arranged close to one side wall of the discharge chamber 10 (the peripheral wall of the case 17).
It is interposed and locked between the side wall of the discharge chamber 10 and the rib 23.

As in the embodiment shown in FIG.
One concave wall portion 21a is disposed so as to face the outlet 9a of the discharge passage, and at least one convex wall portion 21b of the concave-convex mesh wall 21 is disposed downward, and the concave-convex mesh wall Reference numeral 21 vertically divides the discharge chamber 10 at least in the vicinity of the outlet 9a of the discharge passage in the discharge chamber 10.

The ribs 23 are provided on the oil droplet receiving wall 22 shown in FIG.
It also fulfills its function.

In the gas compressor of FIG. 2 as well, the oil in the compressed gas is well separated by the same operation as in FIG.

The discharge chamber 10 has a discharge port 11
However, an oil reservoir 14 is arranged below. The uneven mesh wall 21 and the wall for forming the discharge passage 9 are arranged in the middle.

The oil droplets caught by the uneven mesh wall 21 descend by gravity and fall from mainly below the uneven mesh wall 21 while being caught in the compressed gas flow in the discharge chamber 10.
However, due to the above arrangement, the compressed gas flow below the uneven mesh wall 21 is hardly interrupted by the uneven mesh wall 21 and the like and almost never reaches the discharge port 11 efficiently, and is efficiently collected in the oil sump 14. Is done.

Next, a specific example of the tubular mesh or box-shaped uneven mesh wall 21 formed of the above-described curved surface having deep unevenness will be described with reference to FIG.

FIG. 3A shows an irregular mesh wall of a star-shaped polygonal column wall. Although the figure shows an example of a five-divided star, the number of divisions can be selected as appropriate. The wall surface 21c is formed by a wire net. The height h of the polygonal column is selected according to the mounting position in the discharge chamber 10, but if both bottom surfaces b of the polygonal column are not close to the inner wall of the discharge chamber 10, the compressed gas jet escapes from the bottom surface b. Therefore, it is preferable to increase the height h of the polygonal column or to provide a wire mesh on the bottom surface b.

FIG. 3B shows an irregular mesh wall of a star-shaped polygonal column wall. Although the figure shows an example of a five-divided star, the number of divisions can be selected as appropriate. The wall surface 21c is formed of a metal plate provided with many thin slits on the entire surface. The height h of the polygonal column is selected according to the mounting position in the discharge chamber 10, but if both bottom surfaces b of the polygonal column are not close to the inner wall of the discharge chamber 10, the compressed gas jet escapes from the bottom surface b. For this reason, it is preferable to increase the height h of the polygonal prism or to provide a metal plate with a slit on the bottom surface b.

FIG. 3 (c) shows an irregular mesh wall of a wall-shaped polygonal column wall. Although the figures show eight examples of the shape of a petal, the number of petals can be appropriately selected. The wall surface 21c is
It is formed of a metal plate provided with a large number of fine round holes on the entire surface. The height h of the polygonal column is selected according to the mounting position in the discharge chamber 10.
When it is not close to the inner wall, the compressed gas jet easily escapes from the bottom surface b. Therefore, the height h of the polygonal column may be increased, or a metal plate with a round hole may be provided on the bottom surface b.

3A, 3B and 3C show examples of the star-shaped or fly-shape type, in which the "shape-shaped" or "star-shaped" or the like in which the same shape of a flyer or the like is arranged at equal intervals. Although the positive and negative shape is used, the above-described oil separating action can be obtained even if the uneven mesh wall or the like is arranged at irregular intervals or is distorted.

FIG. 3D shows the outer star-shaped polygonal wall 211.
Is an uneven mesh wall body having a double structure in which an inner star-shaped polygonal prism wall body 212 is overlapped inside. Although the figure shows an example of a five-divided star, the number of divisions can be selected as appropriate. Wall surface 211c,
212c is formed of a wire mesh. Double polygonal column wall 21
The reference numerals 1 and 212 are connected to each other by providing a wire mesh (not shown) on the bottom surface b.

Although FIG. 3D shows a double-walled uneven mesh wall, the number of layers may be three or more. In the case of a plurality of layers, the mesh is slightly coarse because the ejection resistance increases.

Each of the irregular mesh walls illustrated in FIG. 3 is a polygonal column wall. Since the polygonal prism wall is easy to manufacture, it is used in the above-described embodiment. However, the uneven mesh wall in the present invention is not limited to the polygonal prism wall. It may be hollow.

In the present invention, various combinations of materials, shapes, and structures of the uneven mesh wall can be selected in addition to the example shown in FIG. Further, the mounting location in the discharge chamber is not limited to the above embodiment.

[0050]

As described above in detail, according to the present invention, the compressed gas discharged from the compressor body to the discharge chamber via the discharge passage is provided in the discharge chamber in contact with the outlet of the discharge passage. Because it collided with the wall and bounced off the uneven surface of the wall many times and repeated collisions, the oil was separated each time it collided and turned into oil droplets, which dropped into the oil pool below the wall, The oil in the compressed gas is efficiently captured by the uneven mesh wall in the discharge chamber and collected in the oil reservoir. Therefore, the amount of oil contained in the compressed gas sent out of the compressor is reduced, the heat exchange efficiency of the air conditioner is increased, the life of the compressor is prevented from being shortened due to a shortage of oil, and oil is filled in the gas compressor. The amount can be reduced by an amount corresponding to the decrease in the amount of mixed oil.

If the uneven mesh wall is made larger with respect to the discharge chamber, and the uneven mesh wall divides the discharge chamber up and down at least near the outlet of the discharge passage, the wall inside the uneven mesh wall will not move. The amount of compressed gas that is rebounded and interlaced, and the flow velocity decreases, increases, and the ratio of oil trapped in the mesh to form oil droplets increases.

Further, if the irregular mesh wall is a star-shaped polygonal prism wall or a leaf-shaped polygonal prism wall, it is easy to manufacture the irregular mesh wall.

When the uneven mesh wall is locked between the inner wall of the discharge chamber and the outlet of the discharge passage, the uneven mesh wall is stably held against a severe collision of the compressed gas.

When one of the concave wall portions of the uneven mesh wall is arranged so as to face the outlet of the discharge passage, the collision of compressed gas,
The direction of the rebound is symmetrical, the oil trapping efficiency is good, and the holding of the uneven mesh wall is stable against the collision of the compressed gas.

When at least one convex wall portion of the uneven mesh wall is disposed downward, the oil droplets captured by the uneven mesh wall collect on the convex wall portion and quickly drop as large oil droplets.

If the oil droplet receiving wall is provided directly below the downwardly protruding wall surface portion, it is possible to prevent large oil droplets from dropping directly into the oil reservoir and causing oil splashing.

Further, when the uneven mesh wall is formed in a plurality of layers, the oil trapping efficiency is further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the present invention.

FIGS. 3A to 3D are perspective views each showing an example of an uneven mesh wall body used in the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional gas compressor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compressor body 2 rotor 3 cylinder block 4 vane 5 side block 6 side block 7 suction port 8 suction chamber 9 discharge passage 10 discharge chamber 11 discharge port 14 oil sump 15 oil supply path 21 uneven mesh wall 21a concave wall 21b convex Wall 22 Oil drop receiving wall 23 Rib (oil drop receiving wall)

Continued on the front page F term (reference) 3H003 AA05 AB07 AC03 BD05 BD13 BH04 BH05 CD05 3H029 AA05 AA17 AB03 BB05 BB35 BB38 CC25 CC44 3H040 AA09 BB01 CC06 CC15 DD28 DD33

Claims (9)

[Claims] 1. A compressor body for sucking gas from a suction port and compressing the same, a discharge passage for passing compressed gas discharged from the compressor body, and a discharge chamber provided on an outlet side of the discharge passage. In the discharge chamber, an uneven mesh wall body is disposed in contact with a wall surface at the outlet of the discharge passage, and applies oil in the discharged compressed gas to the wall surface to make oil droplets. A gas compressor comprising: an oil reservoir to be recovered; an oil supply path for supplying oil from the oil reservoir to the compressor body; and a discharge port for discharging a gas separated from the oil by the uneven mesh wall to the outside. . 2. The discharge mesh according to claim 1, wherein the uneven mesh wall vertically divides the discharge chamber at least near the outlet of the discharge passage.
A gas compressor as described. 3. The gas compressor according to claim 1, wherein the uneven mesh wall is a star-shaped polygonal wall. 4. The gas compressor according to claim 1, wherein the uneven mesh wall is a wall-shaped polygonal column wall. 5. The gas compressor according to claim 1, wherein the uneven mesh wall is locked between a discharge chamber inner wall and an outlet of a discharge passage. 6. The gas compressor according to claim 1, wherein one of the concave wall portions of the uneven mesh wall faces the outlet of the discharge passage. 7. The gas compressor according to claim 1, wherein at least one convex wall portion of the uneven mesh wall body faces downward. 8. The gas compressor according to claim 7, wherein an oil droplet receiving wall is provided immediately below said downwardly projecting wall surface portion. 9. The gas compressor according to claim 1, wherein the uneven mesh wall has a plurality of layers.