JPH04350391A - Oilless rotary compressor unit - Google Patents

Abstract

PURPOSE:To provide an oilless rotary compressor unit, especially an oil-free screw compressor unit, applicable in a place where no cooling water can be obtained. CONSTITUTION:There are provided an oilless rotary compressor 1 comprising a male rotor and a female rotor enclosed in a casing with a cooling jacket in such a way as to be rotated being meshed with each other, at least one cooler for cooling high temperature discharge gas from the compressor 1, a radiator 13 for cooling refrigerant liquid run through the cooling jacket, and a cooling fan with a duct for air-cooling the cooler and the radiator 13. The cooling jacket and the radiator 13 are connected to form the closed circuit of refrigerant liquid. The refrigerant liquid air-cooled at the radiator 13 is run through the cooling jacket to liquid-cool the compressor, and the high temperature discharge gas from the compressor is air-cooled by the cooler. The cooler and the radiator 13 are disposed within a duct.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit device for an oil-free rotary compressor such as an oil-free screw compressor.

0002

Background of the Invention The conventional device is disclosed in Japanese Patent Application Laid-Open No. 59-93985.
As disclosed in the publication, water is used as the cooling medium liquid for the compressor main body and the precooler, and this cooling water is disposable. Therefore, it cannot be operated in areas where cooling water is not available. In addition, since the discharge temperature is as high as 320° C., cooling of the casing, oil cooler, pre-cooler and after-cooler are all cooled by flowing cooling water. Therefore, there were problems with the maintenance of the compressor, such as early clogging of the cooler due to the quality of the cooling water, and the installation of the compressor was also poor.

0003

OBJECTS OF THE INVENTION An object of the present invention is to provide an oil-free rotary compressor unit device, particularly an oil-free screw compressor unit device, which can be used in places where cooling water is not available.

0004

SUMMARY OF THE INVENTION In order to achieve the above object, an oil-free rotary compressor unit device according to the present invention has a male rotor and a female rotor that are housed in a casing having a cooling jacket so as to mesh with each other and rotate. an oil-free rotary compressor, at least one cooler for cooling high-temperature discharge gas from the compressor, a radiator for cooling a cooling medium liquid passed through the cooling jacket, and the cooler and the radiator. a cooling fan having a duct for air cooling the cooling jacket, the cooling jacket and the radiator are connected to form a closed circulation path for the cooling medium liquid, and the cooling medium liquid air-cooled in the radiator is cooled by the cooling medium. The compressor is liquid-cooled by passing through a jacket, and the high-temperature gas discharged from the compressor is air-cooled by the cooler, and the cooler and radiator are disposed within the duct. That is.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

A single-stage oil-free screw compressor consists of a compressor body 1, a main motor 2, a V-belt 3, an intake blockage valve 4,
Pre-cooler 5, after-cooler 6, check valve 7, oil cooler 8, filter 9, cooling fan 10, speed increasing mechanism 11
, an oil supply pump 12, a radiator 13, a coolant pump 14, and the like.

The compressor body 1 includes a casing 1D having an inlet 1A, an outlet (not shown) and a jacket 1C.
, a male rotor 1E and a female rotor 1F, which are housed in a casing 1D so as to mesh with each other and rotate, and a male rotor 1E.
and a synchronous gear 1G coupled to the shaft of the female rotor 1F. The intake blockage valve 4 is coupled to a cylinder 4A, a piston 4B slidably housed in the cylinder 4A, a spring 4C, and the piston 4B, and includes a blockage valve 4D disposed in the intake gas passage of the compressor body 1. , piping 4E, 4F for supplying and discharging operating air into the cylinder 4A, and solenoid valves 4G, 4H. The precooler 5 includes a shell 5A and a heat transfer tube 5B installed in the shell 5A, and is connected to the discharge port 1B of the compressor main body 1 via a discharge pipe 15. The aftercooler 6 is connected to the outlet of the heat exchanger tube 5B of the precooler 5, and a drain separator 16 is installed at the outlet of the aftercooler 6. The check valve 7 is installed between the precooler 5 and the aftercooler 6. The oil cooler 8 is connected to the outlet of the oil supply pump 12 via a pipe 16A, and the outlet of the oil cooler 8 is connected to a pipe 16B.
It is connected to the lubricated parts (synchronous gear 1G, bearing) of the compressor main body 1 via. Oil from the lubricated portion of the compressor body 1 returns to the oil reservoir 11A of the speed increasing mechanism 11 via the pipe 17. The cooling fan 10 includes a fan casing 10A and an impeller 10B, and the impeller 10B is coupled to a motor 18. The speed increasing mechanism 11 includes a gear casing 11B having an oil reservoir 11A, a pinion gear 11C coupled to a male rotor 1E, and a drive gear 11D meshing with the pinion gear 11C. The oil supply pump 12 has a drive gear 11D.
It is connected to the shaft of the oil tank 11A via a gear, and its suction port communicates with the oil reservoir 11A via piping.

The outlet of the radiator 13 is connected to the jacket 1C via a pipe 19A, a coolant pump 14 and a pipe 19B, and the inlet of the radiator 13 is connected to a pipe 19.
The inside of the shell 5A of the precooler 5 is connected to the jacket 1C via a pipe 19D. Coolant pump 14 is coupled to motor 18 . The suction side of the cooling fan 10 is connected to the air outlets of the precooler 5 , aftercooler 6 , and oil cooler 8 through a duct 20 , and the cooling fan 10 receives air after passing through the precooler 5 , aftercooler 6 , and oil cooler 8 . is inhaled.

Each of the above-mentioned devices is covered with a soundproof cover 21, and this soundproof cover 21 includes a compressed air intake 21A and a cooling air intake 21B for the main motor 2.
, a ventilation air intake 21C, and a cooling air outlet 21D. The duct 20 is formed with an air intake port 20A for causing the cooling fan 10 to draw air inside the soundproof cover 21. A heat exchanger tube 22A of the air release cooler 22 branches from the outlet of the heat exchanger tube 5B of the pre-cooler 5, and this heat exchanger tube 22A is housed in the shell 5A. The outlet of the heat transfer tube 22A is connected to the air release valve 23 via a pipe 24A. A silencer 25 is connected to the air release valve 23 via a pipe 24B.

Next, the operation will be explained.

The rotation of the main motor 2 is transmitted to the male rotor 1E via the V-belt 3, drive gear 11D, and pinion gear 11C, and from the male rotor 1E to the female rotor 1F via the synchronous gear 1G, and then from both rotors 1E. , 1F rotate synchronously, suck in gas (air), compress it, and discharge it from the discharge port 1B. This compressed gas has a temperature of about 320°C, and passes through the discharge pipe 15 to the heat transfer pipe 5B of the precooler 5.
After being precooled to a temperature that does not pose a problem even if it flows into the aftercooler 6, it flows to the aftercooler 6, where it is cooled to a final temperature (about 45° C.).

[0012] The coolant liquid discharged from the radiator 13 is
It passes through the piping 19A, the coolant pump 14, and the piping 19B, flows into the jacket 1C, and takes away heat from the compressor body 1 here. After removing the heat, the coolant liquid is transferred to pipe 19.
D, the compressed gas flows into the shell 5A of the precooler 5, where it precools the compressed gas passing through the heat transfer tube 5B, and then flows into the pipe 19C.
and returns to the radiator 13. In radiator 13,
The cooling air releases heat into the atmosphere and brings the coolant to a temperature that allows it to be cooled. Cooling air is generated by cooling fan 10
It is carried out by

[0013]

[Effects of the Invention] As described above, according to the present invention, a closed circulation path is formed by the cooling jacket of the radiator and compressor, and the cooling medium liquid is circulated within this circulation path, so there is no need for cooling water. In addition, the heat of the compressor body can be dissipated by liquid cooling, and the high temperature discharge gas from the compressor is air cooled by at least one cooler disposed in the duct of the cooling fan together with the radiator. It can release heat. As described above, according to the present invention, it is possible to provide an oil-free rotary compressor unit that can be used in places where cooling water is not available.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention.

[Explanation of symbols]

1... Compressor body
5...Pre-cooler 6...After-cooler
10...Cooling fan 13...Radiator
19A, 19B, 19C, 19D...Piping

Claims (1)

[Scope of Claims] [1] An oil-free rotary compressor having a male rotor and a female rotor housed in a casing having a cooling jacket so as to mesh with each other and rotate, and high-temperature discharge gas from the compressor. at least one cooler for cooling the cooling medium; a radiator for cooling the cooling medium liquid passed through the cooling jacket; and a cooling fan having a duct for air cooling the cooler and the radiator; A cooling jacket and a radiator are connected to form a closed circulation path for the cooling medium liquid, and the cooling medium liquid air-cooled in the radiator is passed through the cooling jacket to liquid-cool the compressor, and the cooling medium liquid is cooled from the compressor. An oil-free rotary compressor unit device, characterized in that the high-temperature discharged gas is air-cooled by the cooler, and the cooler and radiator are disposed within the duct.