CN211819903U - Oil-free screw refrigerating compressor for injecting and isolating lubricating oil - Google Patents

Abstract

The utility model discloses an oil-free screw refrigeration compressor for jetting and isolating lubricating oil. There are end cap grooves on the inner surfaces of the orifices of the suction end caps and the exhaust end caps in the radial direction near the body, and the outer side of the end cap grooves has a non-penetrating jet outlet that communicates with the corresponding end cap grooves. Channel and air inlet channel; the main shafts of the suction end and the exhaust end of the male and female rotors are radially provided with main shaft grooves; The groove of the end cover and the groove of the main shaft are connected to form a high-pressure gas isolation belt to prevent the lubricating oil between the main shaft of the male and female rotors and the mating surface of the end cover from entering the body. The utility model utilizes high-pressure gas to be injected into the isolation channel to form an isolation belt, so as to prevent the lubricating oil between the main shaft and the mating surface of the end cover from entering the body.

Description

Oil-free screw refrigeration compressor with jet isolation lubricant

technical field

The utility model relates to the technical field of refrigeration and air conditioning, in particular to an oil-free screw refrigeration compressor with jet-separated lubricating oil.

Background technique

Screw refrigeration compressors are widely used in refrigeration systems. Existing screw refrigeration compressors require lubricating oil to lubricate the meshing surfaces of the female and male rotors, as well as the inner surfaces of the female and male rotors and the cylinder. The lubricating oil is discharged from the compressor with the gas and enters the heat exchanger. oil film, resulting in increased thermal resistance, decreased heat transfer performance, increased heat transfer temperature difference, increased pressure ratio of the refrigeration compressor, increased power consumption, and decreased performance of the refrigeration system. It is directly sprayed into the body, but the main shafts of the yin and yang rotors are meshed by gears, and the gear box needs lubricating oil. Therefore, it is necessary to develop an isolation lubricating oil mechanism to effectively prevent lubricating oil from entering the body and improve the performance of the refrigeration system.

Utility model content

The purpose of this utility model is to aim at the technical defects existing in the prior art, to provide an oil-free screw refrigeration compressor in the refrigeration technology field that uses jet to isolate lubricating oil, so as to prevent the lubricating oil from entering the screw refrigeration compressor body and realize the refrigeration system. Improve performance and save energy.

The technical scheme adopted by the utility model to solve its technical problems is:

An oil-free screw refrigeration compressor with jet isolation of lubricating oil, comprising a body with suction end caps and exhaust end caps at both ends, a pair of meshing yin and yang rotors placed in the body, and a suction end cap connected to the yin and yang rotors . The inner surface of the orifice of the exhaust end cover is radially provided with end cover grooves near the body position, and the outer side of the end cover grooves is axially provided with a non-penetrating jet outlet channel and a jet inlet channel that communicate with the corresponding end cover grooves. ; The main shafts of the suction end and the exhaust end of the yin and yang rotors are radially provided with main shaft grooves; The main shaft grooves are connected to form an air flow channel, so that high-pressure gas is introduced through the jet inlet channel and then discharged from the jet outlet channel, and a high-pressure gas isolation belt is formed in the air flow channel to prevent the main shaft of the yin and yang rotor from cooperating with the suction end cover and the exhaust end cover The lubricating oil between the surfaces enters the body.

Wherein, the outside of the air inlet channel on the suction end cover and the exhaust end cover are respectively connected with the nozzle outlet of a corresponding air injection nozzle, and are respectively connected with the outlet of the exhaust pipe of the compressor.

Wherein, the body is in the shape of an inverted figure of 8, and the two ends are respectively connected with the suction end cover and the exhaust end cover through sealing gaskets and bolts.

Wherein, the two centers of the inverted 8-shaped suction end cover are respectively provided with an orifice through which the suction end of the female rotor main shaft passes, and an orifice through which the suction end of the male rotor main shaft passes.

Wherein, the suction port opened on the side of the casing close to the suction end cover of the body is connected with the intake pipe, and the exhaust port opened on the side of the casing close to the exhaust end cover is connected with the exhaust pipe , the suction orifices and the exhaust orifices are arranged in parallel and the axis is perpendicular to the axis of the male and female rotors.

Wherein, the outlets of the air jet outlet channels of the suction ends of the male and female rotors are respectively connected with the ejection inlets of the diffuser, and the outlets of the diffuser are connected with the inlet of the condenser.

Wherein, the suction end of the main shaft of the male rotor of the yin-yang rotor extends out of the suction end cover.

Compared with the prior art, the beneficial effects of the present utility model are:

The oil-free screw refrigeration compressor of the utility model jetting and isolating lubricating oil utilizes high-pressure gas to be injected into the isolation channel, and the high-pressure gas in the channel forms an isolation belt, preventing the lubricating oil between the main shaft and the end cover mating surface from entering the body, reducing replacement The heat transfer resistance of the heat exchanger realizes the efficient heat transfer of the heat exchanger, improves the performance of the refrigeration system, saves energy and protects the environment.

Description of drawings

Fig. 1 is the schematic diagram of the oil-free screw refrigeration compressor of jet isolation lubricating oil of the present invention;

FIG. 2 is a right side view of FIG. 1 .

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the oil-free screw refrigeration compressor of the present utility model jetting and isolating lubricating oil comprises:

Intake pipe 1, body 2, male rotor 3, exhaust end cover 4, male rotor exhaust end jet outlet channel 5, male rotor exhaust end main shaft 6, male rotor exhaust end jet nozzle 7, male rotor exhaust end main shaft Groove 8 (annular groove, formed on the outer surface of the main shaft of the exhaust end), air inlet channel 9 at the exhaust end of the male rotor, exhaust pipe 10, air inlet channel 11 at the suction end of the male rotor, groove of the main shaft at the suction end of the male rotor 12 (annular groove, formed on the outer surface of the main shaft of the suction end), the air jet nozzle of the male rotor suction end 13, the suction end of the male rotor main shaft 14, the air jet outlet channel of the male rotor suction end 15, the suction end cover 16, the female rotor Main shaft suction end 17, female rotor suction end jet nozzle 18, female rotor suction end jet outlet channel 19, male rotor exhaust end cover groove 20 (an annular groove, formed on the inner wall of the exhaust end cover orifice), The groove 21 of the suction end cover of the male rotor (an annular groove, formed on the inner wall of the orifice of the suction end cover), wherein the grooves on the exhaust and suction end cover are the same as those formed on the upper and outer surfaces of the main shaft of the male and female rotors. The grooves on the side are arranged coaxially, and the grooves on the main shaft are inside the grooves on the end cover.

The body 2 is an upside-down figure-8 shape, and a pair of yin and yang rotors that mesh and rotate with each other are placed inside. One end is sealed with the suction end cover 16 through sealing gaskets and bolts, and the other end is connected with the exhaust end cover 4 through the sealing gasket. In cooperation with the bolts, the suction port opened at the end of the body close to the suction end cover 16 is connected to the intake pipe 1 by welding, and the exhaust port opened at the end of the body close to the exhaust end cover 4 is welded to the exhaust pipe 10.

The two centers of the figure-eight shape of the suction end cover 16 are respectively provided with an orifice through which the suction end 17 of the female rotor main shaft passes, and an orifice through which the suction end 14 of the male rotor main shaft passes through. Open the female rotor suction end cover groove (not marked) and the male rotor suction end cover groove 21 respectively; close to the upper part of the suction end 17 of the main shaft of the female rotor, open the air outlet channel of the suction end of the female rotor that is not penetrated 19. The lower part is provided with a non-penetrating female rotor suction end air jet inlet channel (not marked), and the female rotor main shaft suction end 17 close to the body is provided with a female rotor suction end main shaft groove (not marked); close to the male rotor main shaft The upper part of the suction end 14 is provided with an unpenetrated male rotor suction end air jet outlet channel 15, the lower part is provided with an unpenetrated male rotor suction end air jet inlet channel 11, and the male rotor main shaft suction end 14 close to the body is provided with a male rotor suction end. Gas end spindle groove 12.

The outlets of the air jet outlet passage 19 at the suction end of the female rotor and the jet outlet passage 15 at the suction end of the male rotor are respectively connected with the ejection inlet of the diffuser (not shown in the figure); The inlets of the air jet nozzles 13 at the suction end of the male rotor are respectively connected with the outlet of the exhaust pipe of the compressor. The inlet of the channel and the air injection inlet channel 11 at the suction end of the male rotor is welded; the air injection nozzle 13 of the male rotor suction end is welded with the inlet of the air injection inlet channel 11 of the male rotor suction end; The inlet of the end jet inlet channel is welded.

The air outlet channel 19 of the suction end of the female rotor, the groove of the suction end cover of the female rotor, the main shaft groove of the suction end of the female rotor, the air inlet channel of the suction end of the female rotor and the air jet nozzle 18 of the suction end of the female rotor are communicated; The air outlet channel 15 of the rotor suction end, the groove 21 of the male rotor suction end cover, the main shaft groove 12 of the male rotor suction end, the air inlet channel 11 of the male rotor suction end and the air nozzle 13 of the male rotor suction end are communicated.

The two centers of the figure-8 shape of the exhaust end cover 4 are respectively provided with an orifice through which the exhaust end of the female rotor main shaft (not marked) passes, and an orifice through which the exhaust end 6 of the male rotor main shaft passes through, and the orifice is close to the body. The female rotor exhaust end cover grooves (not shown) and the male rotor exhaust end cover grooves 20 are respectively provided in the radial direction; close to the upper part of the exhaust end of the main shaft of the female rotor, a jet outlet channel of the exhaust end of the female rotor that is not penetrated is opened (not shown), the lower part is provided with an unpenetrated air jet inlet channel (not shown) at the exhaust end of the female rotor, and a main shaft groove of the exhaust end of the female rotor (not shown) is opened at the exhaust end of the main shaft of the female rotor close to the body; The upper part of the male rotor main shaft exhaust end 6 is provided with an unpenetrated male rotor exhaust end jet outlet channel 5, the lower part is provided with an unpenetrated male rotor exhaust end jet inlet channel 9, and the male rotor main shaft exhaust end 6 of the body is opened. Main shaft groove 8 at the exhaust end of the male rotor.

The outlets of the jet outlet channel of the exhaust end of the female rotor and the jet outlet channel 5 of the exhaust end of the male rotor are respectively connected with the ejection inlet of the diffuser (not shown in the figure); The inlets of the jet nozzle 7 at the exhaust end are respectively connected with the outlet of the exhaust pipe of the compressor, and the nozzle outlets of the jet nozzle at the exhaust end of the female rotor and the jet nozzle 7 at the exhaust end of the male rotor are respectively connected with the inlet channel of the jet at the exhaust end of the female rotor and the male rotor. The inlet of the jet inlet channel 9 at the exhaust end of the rotor is welded; the jet nozzle 7 of the male rotor exhaust end is welded with the inlet of the jet inlet channel 9 of the male rotor exhaust end; the jet nozzle of the female rotor exhaust end and the jet inlet channel of the female rotor exhaust end are welded inlet welding.

The air outlet channel of the exhaust end of the female rotor, the groove of the exhaust end cover of the female rotor, the main shaft groove of the exhaust end of the female rotor, the air injection inlet channel of the exhaust end of the female rotor, and the air nozzle of the exhaust end of the female rotor are communicated; The gas 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 nozzle 7 are communicated.

The suction end 14 of the male rotor main shaft extends out of the suction end cover 16, and the outlet of the diffuser is connected to the inlet of the condenser.

When the compressor is running, the male rotor is driven by the motor to rotate, and the female rotor is driven to follow. Exhaust, most of the high-pressure gas directly enters the condenser, and part of the high-pressure gas passes through the air jet nozzle 18 at the suction end of the female rotor, and the nozzle enters the air jet inlet channel of the suction end of the female rotor, the groove of the suction end cover of the female rotor, and the suction end of the female rotor. The main shaft groove and the air jet outlet channel 19 of the suction end of the female rotor flow out; all the way through the air jet nozzle 13 of the suction end of the male rotor, the nozzle enters the air jet inlet channel 11 of the suction end of the male rotor, the groove 21 of the suction end cover of the male rotor, and the male rotor The main shaft groove 12 at the suction end and the air jet outlet channel 15 at the suction end of the male rotor flow out; the high-pressure gas in the airflow channel forms an isolation belt to prevent the lubricating oil between the main shaft and the mating surface of the end cover from entering the body.

The other part of the high-pressure gas is all the way to the jet nozzle at the exhaust end of the female rotor, the nozzle enters the jet inlet channel of the exhaust end of the female rotor, the groove of the exhaust end cover of the female rotor, the main shaft groove of the exhaust end of the female rotor, and the jet outlet of the exhaust end of the female rotor The channel flows out; all the way through the male rotor exhaust end jet nozzle 7, the nozzle enters the male rotor exhaust end jet inlet channel 9, the male rotor exhaust end cap groove 20, the male rotor exhaust end main shaft groove 8, the male rotor exhaust The end jet outlet channel 5 flows out; the high pressure gas in the air flow channel forms an isolation belt to prevent the lubricating oil between the main shaft and the end cover mating surface from entering the body.

The high-pressure gas flowing out of each channel is mixed and diffused by the diffuser and then enters the condenser.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention. Improvement and modification should also be regarded as the protection scope of the present invention.

Claims (7)

1. An oil-free screw refrigeration compressor for jet isolation of lubricating oil, comprising a body with suction end caps and exhaust end caps at both ends, a pair of meshing yin and yang rotors placed in the body, and an air suction connecting the yin and yang rotors The inner surfaces of the orifices of the end caps and the exhaust end caps are radially provided with end cap grooves near the body, and the outer side of the end cap grooves are axially provided with unpenetrated jet outlet channels and jets that communicate with the corresponding end cap grooves. The inlet channel; the main shafts of the suction end and the exhaust end of the male and female rotors are respectively provided with main shaft grooves in the radial direction; the air jet outlet channel and the air inlet channel of the air inlet end of the air inlet end and the air discharge end of the male and female rotors pass through the corresponding end cap recesses respectively. The groove and the main shaft groove are connected to form an air flow channel, so that the high-pressure gas is introduced through the jet inlet channel and then discharged from the jet outlet channel, and a high-pressure gas isolation belt is formed in the air flow channel to prevent the main shaft of the yin and yang rotors from the suction end cover and the exhaust end cover. The lubricating oil between the mating surfaces enters the body. 2. The oil-free screw refrigeration compressor of jet isolating lubricating oil according to claim 1, characterized in that, the outer side of the jet inlet passage on the suction end cover and the exhaust end cover is respectively connected with a corresponding jet nozzle The nozzle outlet of the compressor is connected to the outlet of the exhaust pipe of the compressor. 3. The oil-free screw refrigeration compressor of jet isolating lubricating oil according to claim 1, is characterized in that, described body is an upside-down figure-eight shape, and both ends pass through sealing gasket with suction end cover and discharge end cover respectively Sheet and bolt sealing mating connection. 4. The oil-free screw refrigeration compressor of jet isolating lubricating oil according to claim 1, is characterized in that, two centers of the inverted 8-shaped described suction end cover respectively open the suction end of the female rotor main shaft to pass through. The orifice through which the suction end of the male rotor main shaft passes. 5. The oil-free screw refrigeration compressor of jet isolating lubricating oil according to claim 1, is characterized in that, the suction orifice opened on one side of the casing near the suction end cover of the body is connected with the air inlet pipe, so The exhaust port opened on the casing side of the body close to the exhaust end cover is connected to the exhaust pipe, the suction port and the exhaust port are arranged in parallel and the axis is perpendicular to the axis of the male and female rotors. 6. The oil-free screw refrigeration compressor of jet isolating lubricating oil according to claim 1, wherein the outlet of the jet outlet channel of the suction end of the male and female rotors is respectively connected with the ejection inlet of the diffuser, so the The outlet of the diffuser is connected to the inlet of the condenser. 7 . The oil-free screw refrigeration compressor for jet isolation of lubricating oil according to claim 1 , wherein the suction end of the main shaft of the male rotor of the male and female rotors protrudes from the suction end cover. 8 .

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