CN111120314A - Oil-free screw refrigerating compressor for injecting and isolating lubricating oil - Google Patents

Oil-free screw refrigerating compressor for injecting and isolating lubricating oil Download PDF

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Publication number
CN111120314A
CN111120314A CN202010069407.5A CN202010069407A CN111120314A CN 111120314 A CN111120314 A CN 111120314A CN 202010069407 A CN202010069407 A CN 202010069407A CN 111120314 A CN111120314 A CN 111120314A
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CN
China
Prior art keywords
air
end cover
male
suction end
lubricating oil
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Pending
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CN202010069407.5A
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Chinese (zh)
Inventor
宁静红
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Tianjin University of Commerce
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Tianjin University of Commerce
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Priority to CN202010069407.5A priority Critical patent/CN111120314A/en
Publication of CN111120314A publication Critical patent/CN111120314A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention discloses an oil-free screw refrigerating compressor for jet isolation of lubricating oil, which comprises a machine body, a pair of meshed male and female rotors, a pair of end cover grooves, a pair of non-penetrating jet outlet channels and a pair of non-penetrating jet inlet channels, wherein the machine body is provided with a suction end cover and a discharge end cover at two ends; main shaft grooves are respectively arranged on the main shafts of the air suction end and the air exhaust end of the male and female rotors in the radial direction; the air suction end of the male and female rotors, the air injection outlet channel of the air exhaust end and the air injection inlet channel of the air suction end are respectively communicated through the corresponding end cover groove and the corresponding main shaft groove, so that a high-pressure gas isolation zone is formed, and lubricating oil between the main shaft of the male and female rotors and the matching surface of the end covers is prevented from entering the machine body. The invention utilizes the high-pressure gas to be injected into the isolation channel to form the isolation belt, thereby preventing the lubricating oil between the matching surfaces of the main shaft and the end cover from entering the machine body.

Description

Oil-free screw refrigerating compressor for injecting and isolating lubricating oil
Technical Field
The invention relates to the technical field of refrigeration air conditioners, in particular to an oil-free screw refrigeration compressor for injecting isolation lubricating oil.
Background
The screw refrigerating compressor is widely applied to a refrigerating system, the existing screw refrigerating compressor needs lubricating oil to lubricate meshing surfaces of a female rotor and a male rotor, inner surfaces of the female rotor and the male rotor and an air cylinder, the lubricating oil is discharged from the compressor along with gas to enter a heat exchanger to form an oil film, so that the thermal resistance is increased, the heat transfer performance is reduced, the heat transfer temperature difference is increased, the pressure ratio of the refrigerating compressor is increased, the power consumption is increased, the performance of the refrigerating system is reduced, the lubricating oil is not directly sprayed into a machine body in the existing oil-free lubricating screw refrigerating compressor, but main shafts of the female rotor and the male rotor are meshed through gears, a gear box needs the lubricating oil, the main shafts of the female. Therefore, it is necessary to develop a lubricating oil isolating mechanism to effectively prevent lubricating oil from entering the machine body and improve the performance of the refrigeration system.
Disclosure of Invention
The invention aims to provide an oil-free screw refrigerating compressor for isolating lubricating oil by air injection in the technical field of refrigeration, aiming at the technical defects in the prior art, so as to prevent the lubricating oil from entering a screw refrigerating compressor body, improve the performance of a refrigerating system and save energy.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an oil-free screw refrigerating compressor for isolating lubricating oil by gas injection comprises a machine body, a pair of meshed male and female rotors, a gas-suction end cover and a gas-exhaust end cover, wherein the two ends of the machine body are provided with the gas-suction end cover and the gas-exhaust end cover; main shaft grooves are respectively arranged on the main shafts of the air suction end and the air exhaust end of the male and female rotors in the radial direction; the air injection outlet channel and the air injection inlet channel of the air suction end and the air exhaust end of the male and female rotors are respectively communicated through the corresponding end cover grooves and the corresponding main shaft grooves to form an air flow channel, so that high-pressure air is introduced through the air injection inlet channel and then is exhausted through the air injection outlet channel, a high-pressure air isolation zone is formed in the air flow channel, and lubricating oil between the main shafts of the male and female rotors and matching surfaces of the air suction end cover and the air exhaust end cover is prevented from entering a machine body.
The outer sides of the air injection inlet channels on the air suction end cover and the air exhaust end cover are respectively connected with the nozzle outlet of the corresponding air injection connecting pipe and are respectively connected with the air exhaust pipe outlet of the compressor.
The machine body is in an inverted 8 shape, and two ends of the machine body are respectively connected with the air suction end cover and the air exhaust end cover in a sealing fit mode through the sealing gasket and the bolt.
Wherein, two centers of the inverted 8-shaped air suction end cover are respectively provided with an orifice through which the air suction end of the female rotor spindle passes and an orifice through which the air suction end of the male rotor spindle passes.
The air suction port is formed in one side, close to the air suction end cover, of the shell of the machine body and is connected with the air inlet pipe, the air exhaust port is formed in one side, close to the air exhaust end cover, of the shell of the machine body and is connected with the air exhaust pipe, and the air suction port and the air exhaust port are arranged in parallel and are perpendicular to the axis of the male and female rotors.
The outlets of the air injection outlet channels at the air suction ends of the male and female rotors are respectively connected with the injection inlet of a diffuser, and the outlet of the diffuser is connected with the inlet of a condenser.
The air suction end of the main shaft of the male rotor and the air suction end of the main shaft of the female rotor extend out of the air suction end cover.
Compared with the prior art, the invention has the beneficial effects that:
according to the oil-free screw refrigerating compressor for injecting the isolation lubricating oil, high-pressure gas is injected into the isolation channel, the high-pressure gas in the channel forms an isolation zone, the lubricating oil between the matching surfaces of the main shaft and the end cover is prevented from entering a machine body, the heat transfer thermal resistance of the heat exchanger is reduced, the efficient heat transfer of the heat exchanger is realized, the performance of a refrigerating system is improved, energy is saved, and the environment is protected.
Drawings
FIG. 1 is a schematic view of an oil-free screw refrigeration compressor of the present invention for jet isolation lubricating oil;
fig. 2 shows a right side view of fig. 1.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1, the present invention relates to an oil-free screw refrigeration compressor for jet isolation of lubricating oil, comprising:
an air inlet pipe 1, a machine body 2, a male rotor 3, an exhaust end cover 4, a male rotor exhaust end jet outlet channel 5, a male rotor exhaust end spindle 6, a male rotor exhaust end jet connecting pipe 7, a male rotor exhaust end spindle groove 8 (a ring groove formed on the outer surface of the exhaust end spindle), a male rotor exhaust end jet inlet channel 9, an exhaust pipe 10, a male rotor air suction end jet inlet channel 11, a male rotor air suction end spindle groove 12 (a ring groove formed on the outer surface of the air suction end spindle), a male rotor air suction end jet connecting pipe 13, a male rotor spindle air suction end 14, a male rotor air suction end jet outlet channel 15, an air suction end cover 16, a female rotor spindle air suction end 17, a female rotor air suction end jet connecting pipe 18, a female rotor air suction end jet outlet channel 19, a male rotor exhaust end cover groove 20 (a ring groove formed on the inner wall of an exhaust end cover orifice), a male rotor air suction, formed on the inner wall of the orifice of the end cover for air exhaust, wherein the grooves on the end cover for air exhaust and air suction are arranged coaxially with the grooves on the same side formed on the outer surfaces of the main shafts of the male and female rotors, and the grooves on the main shaft are arranged on the inner side of the grooves on the end cover, and are mutually matched to form an annular channel type gas isolation belt between the main shaft and the orifice of the end cover.
The machine body 2 is in an inverted 8 shape, a pair of meshed and mutually-rotating male and female rotors is placed inside the machine body, one end of the machine body is in sealing fit with the air suction end cover 16 through a sealing gasket and a bolt, the other end of the machine body is in sealing fit with the air exhaust end cover 4 through a sealing gasket and a bolt, an air suction hole formed in one end, close to the air suction end cover 16, of the machine body is in welded connection with the air inlet pipe 1, and an air exhaust hole formed in one end, close to the air exhaust end cover.
Two 8-shaped centers of the air suction end cover 16 are respectively provided with an orifice through which the air suction end 17 of the female rotor spindle passes and an orifice through which the air suction end 14 of the male rotor spindle passes, and positions of the two orifices, which are close to the machine body, are respectively provided with a female rotor air suction end cover groove (not marked) and a male rotor air suction end cover groove 21 in the radial direction; an air injection outlet channel 19 of the air suction end of the female rotor which is not penetrated is arranged at the upper part close to the air suction end 17 of the main shaft of the female rotor, an air injection inlet channel (not marked) of the air suction end of the female rotor which is not penetrated is arranged at the lower part, and a main shaft groove (not marked) of the air suction end of the main shaft of the female rotor which is close to the air suction end 17 of the main shaft of the female rotor of the machine; an air injection outlet channel 15 of the air suction end of the male rotor is arranged at the upper part close to the air suction end 14 of the main shaft of the male rotor, an air injection inlet channel 11 of the air suction end of the male rotor is arranged at the lower part, and an air suction end main shaft groove 12 of the male rotor is arranged at the air suction end 14 of the main shaft of the male rotor close to the machine body.
Outlets of the female rotor air suction end air jet outlet channel 19 and the male rotor air suction end air jet outlet channel 15 are respectively connected with an injection inlet of a diffuser (not shown in the figure); inlets of the female rotor air suction end air injection connecting pipe 18 and the male rotor air suction end air injection connecting pipe 13 are respectively connected with an outlet of an exhaust pipe of the compressor, and outlets of nozzles of the female rotor air suction end air injection connecting pipe 18 and the male rotor air suction end air injection connecting pipe 13 are respectively welded with inlets of a female rotor air suction end air injection inlet channel and a male rotor air suction end air injection inlet channel 11; the air injection connecting pipe 13 at the air suction end of the male rotor is welded with the inlet of the air injection inlet channel 11 at the air suction end of the male rotor; the female rotor suction side jet nozzle 18 is welded to the inlet of the female rotor suction side jet inlet passage.
The female rotor air suction end air injection outlet channel 19, the female rotor air suction end cover groove, the female rotor air suction end main shaft groove, the female rotor air suction end air injection inlet channel and the female rotor air suction end air injection connecting pipe 18 are communicated; the air injection outlet channel 15 of the air suction end of the male rotor, the air suction end cover groove 21 of the male rotor, the main shaft groove 12 of the air suction end of the male rotor, the air injection inlet channel 11 of the air suction end of the male rotor and the air injection connecting pipe 13 of the air suction end of the male rotor are communicated.
Two 8-shaped centers of the exhaust end cover 4 are respectively provided with an orifice through which a female rotor spindle exhaust end (not marked) passes and an orifice through which a male rotor spindle exhaust end 6 passes, and the positions of the orifices close to the machine body are respectively provided with a female rotor exhaust end cover groove (not marked) and a male rotor exhaust end cover groove 20 in the radial direction; an air jet outlet channel (not marked) at the exhaust end of the female rotor is arranged at the upper part close to the exhaust end of the main shaft of the female rotor, an air jet inlet channel (not marked) at the exhaust end of the female rotor is arranged at the lower part, and a main shaft groove (not marked) at the exhaust end of the main shaft of the female rotor is arranged at the exhaust end of the main shaft of the female rotor close to the machine body; an air jet outlet channel 5 at the exhaust end of the male rotor is arranged near the upper part of the air exhaust end 6 of the main shaft of the male rotor, an air jet inlet channel 9 at the exhaust end of the male rotor is arranged near the lower part of the air exhaust end of the main shaft of the male rotor, and a main shaft groove 8 at the exhaust end of the main shaft of the male rotor is arranged near the exhaust end 6 of the main shaft of the male rotor.
Outlets of the female rotor exhaust end jet outlet channel and the male rotor exhaust end jet outlet channel 5 are respectively connected with an injection inlet of the diffuser (not shown in the figure); inlets of the female rotor exhaust end air injection connecting pipe and the male rotor exhaust end air injection connecting pipe 7 are respectively connected with an exhaust pipe outlet of the compressor, and nozzle outlets of the female rotor exhaust end air injection connecting pipe and the male rotor exhaust end air injection connecting pipe 7 are respectively welded with inlets of a female rotor exhaust end air injection inlet channel and a male rotor exhaust end air injection inlet channel 9; the air injection connecting pipe 7 at the exhaust end of the male rotor is welded with the inlet of an air injection inlet channel 9 at the exhaust end of the male rotor; and the air injection connecting pipe at the exhaust end of the female rotor is welded with the inlet of the air injection inlet channel at the exhaust end of the female rotor.
The female rotor exhaust end jet outlet channel, the female rotor exhaust end cover groove, the female rotor exhaust end main shaft groove, the female rotor exhaust end jet inlet channel and the female rotor exhaust end jet connecting pipe are communicated; the male rotor exhaust end jet outlet channel 5, the male rotor exhaust end cover groove 20, the male rotor exhaust end main shaft groove 8, the male rotor exhaust end jet inlet channel 9 and the male rotor exhaust end jet connecting pipe 7 are communicated.
Wherein, the air suction end 14 of the main shaft of the male rotor extends out of an air suction end cover 16, and the outlet of the diffuser is connected with the inlet of the condenser.
When the compressor runs, the male rotor rotates under the driving of the motor to push the female rotor to be driven, low-temperature and low-pressure gas enters the space between the male rotor and the female rotor and a machine body through the gas inlet pipe 1, the compressed high-pressure gas is discharged through the gas outlet pipe 10, most of the high-pressure gas directly enters the condenser, and part of the high-pressure gas enters the gas injection inlet channel of the suction end of the female rotor, the gas suction end cover groove of the female rotor, the main shaft groove of the suction end of the female rotor and the gas injection outlet channel 19 of the suction end of the female rotor through the gas injection connecting pipe 18 of the; one path of the air flows into an air injection inlet channel 11 of the air suction end of the male rotor, an air suction end cover groove 21 of the male rotor, a main shaft groove 12 of the air suction end of the male rotor and an air injection outlet channel 15 of the air suction end of the male rotor through an air injection connecting pipe 13 of the air suction end of the male rotor and a nozzle; the high-pressure gas in the gas flow channel forms an isolation belt to prevent lubricating oil between the matching surfaces of the main shaft and the end cover from entering the machine body.
The other part of high-pressure gas enters a female rotor exhaust end jet connecting pipe and a nozzle into a female rotor exhaust end jet inlet channel, a female rotor exhaust end cover groove, a female rotor exhaust end main shaft groove and a female rotor exhaust end jet outlet channel to flow out; one path enters a male rotor exhaust end jet inlet channel 9, a male rotor exhaust end cover groove 20, a male rotor exhaust end main shaft groove 8 and a male rotor exhaust end jet outlet channel 5 through a male rotor exhaust end jet connecting pipe 7 and a nozzle and flows out; the high-pressure gas in the gas flow channel forms an isolation belt to prevent lubricating oil between the matching surfaces of the main shaft and the end cover from entering the machine body.
The high-pressure gases flowing out of each path are mixed and diffused by a diffuser and then enter a condenser.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. An oil-free screw refrigerating compressor for isolating lubricating oil by gas injection comprises a machine body, a pair of meshed male and female rotors, a gas-suction end cover and a gas-exhaust end cover, wherein the two ends of the machine body are provided with the gas-suction end cover and the gas-exhaust end cover; main shaft grooves are respectively arranged on the main shafts of the air suction end and the air exhaust end of the male and female rotors in the radial direction; the air injection outlet channel and the air injection inlet channel of the air suction end and the air exhaust end of the male and female rotors are respectively communicated through the corresponding end cover grooves and the corresponding main shaft grooves to form an air flow channel, so that high-pressure air is introduced through the air injection inlet channel and then is exhausted through the air injection outlet channel, a high-pressure air isolation zone is formed in the air flow channel, and lubricating oil between the main shafts of the male and female rotors and matching surfaces of the air suction end cover and the air exhaust end cover is prevented from entering a machine body.
2. An oil-free screw refrigeration compressor for injecting lubricating oil according to claim 1, wherein the outer sides of the injection inlet passages on the suction end cover and the exhaust end cover are respectively connected with the nozzle outlet of a corresponding injection connecting pipe and the exhaust outlet of the compressor.
3. An oil-free screw refrigeration compressor for injecting isolation lubricating oil according to claim 1, wherein the body is in an inverted 8 shape, and two ends of the body are respectively connected with the suction end cover and the exhaust end cover in a sealing fit manner through a sealing gasket and a bolt.
4. An oil-free screw refrigeration compressor for injecting isolation lubricating oil according to claim 1, wherein the two centers of the inverted 8-shaped suction end cover are respectively provided with an orifice through which a suction end of a main shaft of a female rotor passes and an orifice through which a suction end of a main shaft of a male rotor passes.
5. An oil-free screw refrigeration compressor for injecting isolation lubricating oil according to claim 1, wherein the air suction port formed on one side of the housing of the body close to the air suction end cover is connected with an air inlet pipe, the air exhaust port formed on one side of the housing of the body close to the air exhaust end cover is connected with an air exhaust pipe, and the air suction port and the air exhaust port are arranged in parallel and have axes perpendicular to the axes of the male and female rotors.
6. An oil-free screw refrigeration compressor for injecting isolation lubricating oil according to claim 1, wherein outlets of the air injection outlet passages at the air suction ends of the male and female rotors are respectively connected with an injection inlet of a diffuser, and an outlet of the diffuser is connected with an inlet of a condenser.
7. An oil-free screw refrigeration compressor for gas injection isolation lubricating oil as claimed in claim 1, wherein the main shaft suction end of the male rotor of the male and female rotors extends out of the suction end cap.
CN202010069407.5A 2020-01-21 2020-01-21 Oil-free screw refrigerating compressor for injecting and isolating lubricating oil Pending CN111120314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010069407.5A CN111120314A (en) 2020-01-21 2020-01-21 Oil-free screw refrigerating compressor for injecting and isolating lubricating oil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010069407.5A CN111120314A (en) 2020-01-21 2020-01-21 Oil-free screw refrigerating compressor for injecting and isolating lubricating oil

Publications (1)

Publication Number Publication Date
CN111120314A true CN111120314A (en) 2020-05-08

Family

ID=70491133

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010069407.5A Pending CN111120314A (en) 2020-01-21 2020-01-21 Oil-free screw refrigerating compressor for injecting and isolating lubricating oil

Country Status (1)

Country Link
CN (1) CN111120314A (en)

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