JP4037107B2 - Gas compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas compressor used for refrigerant gas compression, such as a car air conditioner and GHP.
[0002]
[Prior art]
FIG. 5 shows a conventional gas compressor. The gas compressor that compresses the refrigerant gas introduces the refrigerant gas from the intake port 1a into the intake chamber 1 from the piping of the system, and mechanical movement of the compressor body 2, for example, in the case of a rotary vane type as shown in FIG. With the rotation of the rotor 3, the refrigerant gas is sucked from the intake chamber 1 and compressed, the compressed refrigerant gas is discharged into the discharge chamber 4 and temporarily stored, and returned from the discharge port 4a to the pipe.
[0003]
The compressor main body 2 sucks and compresses the refrigerant gas when the rotor 3 rotates and the compression chamber formed around the rotor 3 is contracted by a vane which is radially set and slides on the rotor 3. Therefore, it is necessary to lubricate the sliding parts such as the rotor 3 and the vanes and to maintain the airtightness of the compression chamber. For this purpose, lubricating oil is used.
[0004]
Since the gas compressor is sealed except for the refrigerant gas outlets 1a and 4a, the lubricating oil is stored in an oil reservoir 5 formed in the lower portion of the discharge chamber 4, and the lubricating oil supply passage 6 is passed through. Via, it is supplied to the bearing 2a of the compressor body 2 and other sliding portions 2b, 2c, etc., and the sliding portions are lubricated and sealed.
[0005]
The used lubricating oil is mixed into the compressed refrigerant gas in the compressor body 2 and discharged into the discharge chamber 4. A cyclone type oil separator 7 is provided at the outlet of the compressed refrigerant gas to the discharge chamber 4. The oil separator 7 separates the lubricating oil from the compressed refrigerant gas and falls into the oil reservoir 5 for recovery. And reused.
[0006]
By the way, the refrigerant gas flow vigorously discharged into the discharge chamber 4 becomes a jet flow in the discharge chamber 4 and collides with the lubricating oil surface of the oil reservoir 5 to entrain the lubricating oil while roughening the surface, and the refrigerant mixed with this lubricating oil. There is a possibility that the gas flows out from the discharge port 4a to the piping of the system and the lubricating oil is mixed into the piping.
[0007]
In view of this, various structures have been invented in the past in which a mesh-like or plate-like obstacle is installed in the discharge chamber 4 through which a jet of compressed refrigerant gas flows to soften the jet. However, even in this case, the jet of the compressed refrigerant gas may reach the lubricating oil surface of the oil reservoir 5 to roughen the lubricating oil surface, and the compressed refrigerant gas may entrain the lubricating oil.
[0008]
When lubricating oil is mixed into the system piping, the corresponding amount of lubricating oil becomes insufficient, so it is necessary to enclose a large amount of lubricating oil in advance in the gas compressor in anticipation of the shortage, and the system OCR There is a problem that the heat exchange capacity of car air conditioners and the like is lowered due to the increase.
[0009]
[Problems to be solved by the invention]
The present invention solves the above-described problems and provides a gas compressor in which the amount of lubricating oil in an oil reservoir is caught in a compressed refrigerant gas and flows out into the piping of the system is reduced.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, a gas compressor according to the present invention temporarily stores a compressor main body that sucks and compresses a refrigerant gas from outside the compressor by mechanical motion, and a compressed refrigerant gas discharged from the compressor main body. A discharge chamber that is stored and then returned to the outside of the compressor, an oil reservoir that is formed in the lower portion of the discharge chamber and stores the lubricating oil, and the lubricating oil stored in the oil reservoir by mechanical movement of the compressor body. A lubricating oil supply path that supplies a sliding portion that slides, a lubricating oil that is stored in the oil reservoir, and a compressed refrigerant gas that is temporarily stored in the discharge chamber, floating on the surface of the lubricating oil stored in the oil reservoir. And an oil level stabilizer having a net shape .
[0011]
Further, in the gas compressor, if a guide for raising and lowering the oil level stabilizer is provided in the discharge chamber, the oil level stabilizer may move to a position away from the compressed refrigerant gas jet in the discharge chamber, or oil separation may occur. It will not get caught in obstacles such as vessels.
[0012]
If the oil level stabilizer is made into a net-like shape, the lubricating oil is recovered even through the mesh gap.
[0013]
If the oil level stabilizer is provided with a float that provides buoyancy, or if the oil level stabilizer itself has a hollow structure, a material with high durability and oil resistance, such as metal and glass fiber, is used as the material for the oil level stabilizer. can do.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[0015]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention. In FIG. 1, items and parts described in the prior art are denoted by the same reference numerals as those in FIG. 5, and detailed description thereof is omitted.
[0016]
In FIG. 1, 10 is an oil level stabilizer which is a feature of the present invention. The oil level stabilizing member 10 are polyethylene, foamed polyethylene, foamed polypropylene, foamed urethane, etc. oil resistance refrigerant resistance synthetic resin such as polystyrene foam, obtained by forming a material having a small specific gravity reticulated than the lubricating oil, the oil reservoir Floating on the surface of the lubricating oil stored in 5, the lubricating oil stored in the oil reservoir 5 and the compressed refrigerant gas temporarily stored in the discharge chamber 4 are partitioned.
[0017]
During operation of the compressor, more lubricant is supplied to the compressor body 2 than when the operation is stopped. Therefore, the lubricant surface 11 of the oil sump 5 is lowered, and when the operation is stopped, the lubricant surface 11 is stopped. However, the oil level stabilizer 10 moves up and down as the oil level rises and lowers, and always partitions the lubricating oil in the oil reservoir 5 from the compressed refrigerant gas in the discharge chamber 4.
[0018]
When the compressed refrigerant gas discharged from the compressor main body 2 through the compressor operation passes through the oil separator 7, the lubricating oil which collides with the wire mesh and is mixed is separated and becomes a jet flow in the discharge chamber 4. Discharged. The separated oil droplets of the lubricating oil adsorb to each other to form larger oil droplets, settle in the compressed refrigerant gas, fall into the oil reservoir 5 and are used again as the lubricating oil. The oil droplets that have fallen on the oil level stabilizer 10 are also swept away by the jet gas and agglomerate to quickly join the lubricating oil in the oil reservoir 5. At this time, if the oil level stabilizer 10 is net-like or porous, and there is a fine gap, the gap is wet with the lubricating oil, so it joins the lubricating oil below the oil level stabilizer 10 also from the gap. The oil droplets on the oil level stabilizer 10 are more quickly isolated and recovered from the jet.
[0019]
On the other hand, since the jet gas of the compressed refrigerant only hits the oil level stabilizer 10, it does not collide with the lubricating oil surface of the oil reservoir 5, and the oil level is kept calm and is caught in the jet gas of the compressed refrigerant. The amount mixed and flowing out to the system piping outside the compressor is reduced. Since the jet mainly hits the oil surface obliquely, there is almost no possibility that the jet will entrain the lubricating oil under the oil level stabilizer 10 through the gap.
[0020]
By reducing the amount of lubricating oil in the oil sump 5 entrained and mixed in the jet gas of the compressed refrigerant and flowing out into the system piping outside the compressor, the OCR of the system is reduced to prevent the heat exchange capacity from being lowered, Lubricating oil concentrates on the lubrication of the compressor body 2 and is used effectively.
[0021]
FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention. 2, the items and parts described in FIGS. 1 and 5 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0022]
In FIG. 2, 12 is an oil level stabilizer which is a feature of the present invention. The oil level stabilizer 12 is made of the same material as that of the embodiment shown in FIG. 1, is formed in the same shape, and a hub 13 through which a guide hole 13a passes is provided at the center.
[0023]
Reference numeral 14 denotes a bar-shaped guide provided in the discharge chamber 4 with the upper and lower sides fixed to the wall of the discharge chamber 4. The guide hole 13a of the oil level stabilizer 12 is inserted into the guide 14 with a sufficient gap. The oil level stabilizer 12 is guided by the guide 14 and moves up and down as the lubricating oil level 11 moves up and down. It is designed to go up and down.
[0024]
That is, the oil level stabilizer 12 is floated on the surface 11 of the lubricating oil stored in the oil reservoir 5, guided by the guide 14, and moved up and down according to the vertical movement of the oil surface, while being stored in the oil reservoir 5. And the compressed refrigerant gas temporarily stored in the discharge chamber 4. The oil level stabilizer 12 is restrained by the guide 14 and cannot move so much in the horizontal plane, and when the oil level rises, the oil level stabilizer 12 is caught in the lower wall of the oil separator 7 and submerged in the oil. When the oil level descends, it does not escape to the corner where the jet does not directly hit, and always covers the lubricating oil surface to which the compressed refrigerant gas jet hits, and the compressed refrigerant gas jet and the oil in the reservoir The surface is securely separated.
[0025]
FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention. In FIG. 3, the same reference numerals are given to the items and portions described in FIG. 1, FIG. 2, and FIG. 5, and detailed descriptions thereof are omitted.
[0026]
In FIG. 3, 15 is an oil level stabilizer which is a feature of the present invention. The oil level stabilizer 15 is made of an oil resistant material such as iron, aluminum, brass or the like, glass fiber, nitrile rubber, chloroprene rubber, natural rubber, etc., which is more durable than a synthetic resin such as polyethylene, and has a net shape . . A hub 13 through which a guide hole 13a passes is provided at the center of the oil level stabilizer 15. Further, a float 16 that provides buoyancy to the oil level stabilizer 15 is provided on the outer peripheral portion. The float 16 may have a hollow structure, or may be made of a solid oil-resistant synthetic resin having a small specific gravity. By this float 16, the specific gravity is larger than the specific gravity of the lubricating oil in which the refrigerant gas is dissolved (the refrigerant gas is dissolved in the lubricating oil under the high pressure of the gas compressor), and the oil level stabilizer 15 alone cannot float. Even in this case, it can be used as an oil level stabilizer.
[0027]
FIG. 4 is a longitudinal sectional view showing a reference example of the present invention. 4, the same reference numerals are given to the items and portions described in FIG. 1, FIG. 3, and FIG. 5, and detailed descriptions thereof are omitted.
[0028]
In FIG. 4, 17 is an oil level stabilizer which is a feature of the reference example of the present invention. The oil level stabilizer 17 has a hollow structure, and the whole plays a role of a float. A guide hole 17 a is provided in the center of the oil level stabilizer 17, and the guide hole 17 a is inserted through the guide 14 with a sufficient gap. The oil level stabilizer 17 is guided by the guide 14. As the lubricating oil surface 11 moves up and down, it moves up and down.
[0029]
In the embodiment shown in FIG. 3 and the reference example shown in FIG. 4, the oil level stabilizer 15 or 17 is floated on the surface 11 of the lubricating oil stored in the oil reservoir 5 and guided to the guide 14. Thus, the lubricating oil stored in the oil reservoir 5 and the compressed refrigerant gas temporarily stored in the discharge chamber 4 are partitioned while moving up and down according to the vertical movement of the oil surface. The oil level stabilizer 15 or 17 is restrained by the guide 14 and cannot move so much in the horizontal plane. When the oil level rises, the oil level stabilizer 15 or 17 is caught in the lower wall of the oil separator 7 and is submerged in the oil. When the oil level is lowered, it does not escape to the corner where the jet does not directly hit, and always covers the lubricating oil surface where the jet of compressed refrigerant hits, covering the compressed refrigerant gas jet and the oil reservoir. The lubricant surface is securely partitioned.
[0030]
As a guide for guiding the raising and lowering of the oil level stabilizer in this invention, a grooved guide provided on the wall surface of the discharge chamber, a ridge guide or the like may be used in addition to the rod-shaped guide of the above-described embodiment. Moreover, it is preferable that the planar shape of the oil level stabilizer is set in a range that covers the oil level to which the compressed refrigerant gas jet hits as much as possible along the discharge chamber cross-sectional shape within the oil level stabilizer raising and lowering range.
[0031]
【The invention's effect】
As described above in detail, the present invention floats the oil level stabilizer on the surface of the lubricating oil stored in the oil reservoir, and the compressed refrigerant gas temporarily stored in the discharge chamber and the lubricating oil stored in the oil reservoir. Therefore, the amount of lubricating oil in the oil sump is caught in the compressed refrigerant gas jet in the discharge chamber and flows out into the system piping outside the compressor together with the compressed refrigerant gas. This can prevent the heat exchange capacity from being reduced, and the lubricating oil can be used effectively in the gas compressor, and lubrication is possible without enclosing a large amount of lubricating oil in the gas compressor. There will be no defects.
[0032]
Further, in the above gas compressor, if a guide for guiding the raising and lowering of the oil level stabilizer is provided in the discharge chamber, the oil level stabilizer is always maintained at an appropriate position so that the compressed refrigerant gas jet and the oil surface of the oil reservoir Are reliably partitioned by the oil level stabilizer.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention.
FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a reference example of the present invention.
FIG. 5 is a longitudinal sectional view showing a conventional gas compressor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intake chamber 2 Compressor main body 4 Discharge chamber 5 Oil reservoir 6 Lubricating oil supply path 7 Oil separator 10 Oil level stabilizer 11 Lubricating oil level 12 Oil level stabilizer 13 Hub 14 Guide 15 Oil level stabilizer 16 Float 17 Oil level Stabilizer

Claims (3)

A compressor body that sucks and compresses refrigerant gas from outside the compressor by mechanical movement;
A discharge chamber for temporarily storing the compressed refrigerant gas discharged from the compressor body and returning it to the outside of the compressor;
An oil reservoir that is formed in the lower part of the discharge chamber and stores lubricating oil;
A lubricating oil supply path for supplying lubricating oil stored in the oil reservoir to a sliding portion that slides by mechanical movement of the compressor body;
It floats on the surface of the lubricating oil stored in the oil reservoir, partitions the lubricating oil stored in the oil reservoir from the compressed refrigerant gas temporarily stored in the discharge chamber, and forms a net-like oil level stabilizer. A gas compressor comprising the gas compressor.   The gas compressor according to claim 1, wherein a guide for raising and lowering the oil level stabilizer is provided in the discharge chamber.   The gas compressor according to claim 1 or 2, wherein a float that imparts buoyancy to the oil level stabilizer is provided.

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