JPH08296574A - Unlubricated screw compressor - Google Patents

Abstract

PURPOSE: To absorb the position-inclination slippage of each equipment on the other party side so as to improve assemblage by a large margin by dividing a discharge gas pipeline into a plurarity of discharge pipelines so as to have straight pipe parts of two directions or more and one curved pipe part or more, and making the positions and angles around X-Z triaxial directions minutely adjustable. CONSTITUTION: A discharge pipeline for connecting the outlet flange 21 of a compressor body 1 to the inlet flange 22 of a high pressure cooler 8 is formed into three-divided structure composed of discharge pipelines 31-33. In the connected state of the divided discharge pipelines 31-33, the outlet flange 43 of the tertiary discharge pipeline 33 connected to the flange 22 of the high pressure cooler 8 is made rotatable at three inlet flange 41-43 parts, that is, around X-Z axis directions, in relation to the inlet flange 41 of the primary discharge pipeline 31 connected to the flange 28 on the compressor body 1 side. In addition, the positions of outlet flanges 51-53 are made displaceable using fitting oblong holes so as to improve assemblage by a large margin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oilless screw compressor.

[0002]

2. Description of the Related Art In the case of an air-cooled single-stage oil-free screw compressor, for example, as disclosed in Japanese Patent Laid-Open No. 1-278989, the gas compressed by the compressor body is made of a material such as stainless steel. The compressed gas is cooled in the order of the air-cooled primary cooler (precooler) and the aluminum secondary cooler (aftercooler). A flexible pipe was used to connect the compressor body and the primary cooler.

[0003]

In the above-mentioned prior art, for example, in an air-cooled single-stage oilless screw compressor, a flexible pipe is used as the discharge pipe connecting the compressor body and the precooler. This was due to the use of flexible pipes with high flexibility to absorb manufacturing errors in the compressor body, precooler, etc. and the positional deviation that occurs when assembling these devices. Further, since the handling and mounting are easy, the use of the flexible pipe is advantageous in reducing the number of assembling steps. However, the wall thickness of the flexible tube is as thin as 0.1 to 0.3 mm, and the flexible tube repeatedly expands and contracts in response to pressure changes of the discharge air due to repeated start / stop and repeated loading / unloading, so the flexible tube is damaged depending on the operating conditions. There was a problem of doing.

An object of the present invention is to improve the assembling workability of the discharge gas pipe without reducing the strength and life of the discharge gas pipe or each device connected to the discharge gas pipe when the discharge gas pipe becomes long. is there.

[0005]

In order to solve the above problems, a compressor body for compressing a gas, a cooler for cooling the pressurized gas, and a discharge for connecting the compressor body and the cooler The following means are used in an oil-free screw compressor having a gas pipe.

The discharge gas pipe is divided into a plurality of discharge gas pipes so as to have a straight pipe portion in two or more directions and one or more curved pipe portions. The number of divisions should be at least three, and each of the divided discharge gas pipes shall be provided with an inlet and an outlet with flanges that engage with the mating pipe or mating equipment. A mechanism, that is, a lap joint / flange structure, in which at least one of both flanges can rotate around the tube axis direction is provided. Further, the rotary shafts of the flanges of each of the divided discharge gas pipes differ by 90 ° from each other, and are at least triaxial.

Further, at least one of the inlet flange and the discharge flange of each of the plurality of divided discharge gas pipes is provided with a bolt fastening hole as an elongated hole, and the longitudinal direction of the elongated hole of each flange is different by at least 90 ° and at least three. It is configured to be axial.

[0008]

[Operation] In order to connect the compressor main body outlet flange and the cooler inlet flange with a steel pipe discharge gas pipe without using a flexible pipe, the discharge gas pipe should be located at the compressor main body outlet flange and the cooler inlet flange position. It is necessary to have a structure capable of absorbing assembling and manufacturing errors (including inclination) and manufacturing errors of the discharge gas pipe itself.

Therefore, when the flange on one side of the discharge gas pipe is fixed, if the structure is such that the inclination and position of the flange on the other side can be finely adjusted, the flange surface on one side of the discharge gas pipe and the flange surface of the other device can be adjusted. The position and inclination can be matched.

If one flange of the mating device is fixed, the degree of freedom due to an error in assembling and manufacturing the flange of the mating device on the other side is the freedom of position in the X, Y, and Z directions and the flange surface. This gives a total of 6 degrees of freedom in the direction of the normal (direction of inclination, degree of freedom 3).

On the other hand, the discharge gas pipe of the present invention has a divided structure of three or more pieces, and in a state where the divided discharge gas pipes are partly assembled, the other side with respect to the flange on one side to be mated with the counterpart device is connected to the other side. The flange can be freely rotated around the X, Y, and Z axis directions by rotating three or more rotatable flanges on the way, and can be tilted in any direction. Further, by displacing and fixing the position of the intermediate flange using the mounting elongated hole, the flange on the other side can be displaced in the X, Y, and Z triaxial directions. Therefore, the flange on one side has six degrees of freedom, and can be matched with the position and inclination of the flange surface of the counterpart device.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The overall flow will be described with reference to FIG. The flow of compressed air is such that the air sucked in from a suction filter (not shown) is compressed by the compressor body 1 to a predetermined pressure of 7 kgf.
Increase the pressure to / cm ² (g). By this, about 300-350
The discharge air that has reached a high temperature up to ℃ enters the air-cooled precooler 8 via the discharge pipe 7. Here, it is cooled to about 150 ° C., and is further cooled to about 150 ° C. by the aftercooler 10 via the check valve 9 and discharged. The drive of the compressor main body 1 drives the power of the motor 2 by the V belt 3 in the gear case 14
The gear shatter 4 in the
Is performed by increasing the speed. Further, a lubricating device including an oil pump 16 and an oil cooler 17 for lubricating the gears and bearings of the compressor body 1, and a coolant pump 1 for cooling the compressor body 1
2. It has a coolant circulation device composed of the coolant cooler 13 and the like. The after cooler 10, the oil cooler 17, and the coolant cooler 13 are integrated coolers, and the cooler 18 and the high precooler 8 are cooled by the cooling air emitted from the ventilation fan 19.

When assembling the compressor unit shown in FIG.
The gear case 14, the high pre-cooler 8, the cooler 18, etc. are fixed on a common base, that is, a common base (not shown) as shown in FIG.
Fixed to. The outlet flange 21 of the compressor body 1 and the inlet flange 22 of the high precooler 8 need to be connected by the discharge pipe 7. The position and inclination of the inlet flange 22 of the high precooler 8 with respect to the outlet flange 21 of the compressor body 1 have some variations due to manufacturing errors and mounting errors of the mounting member. On the other hand, the discharge pipe 7 itself has a manufacturing error, and when the manufacturing error and the mounting error of each device described above are large, it becomes impossible to mount the discharge pipe 7 between the compressor body 1 and the high precooler 8. Or, forcibly attach, discharge pipe 7
Also, an excessive internal load may be applied to the other device. Therefore, in the prior art, a flexible pipe is used as the discharge pipe 7 in order to absorb the mounting error and the assembly error of each device. However, the wall thickness of the flexible tube is as thin as 0.1 to 0.3 mm, and the flexible tube repeatedly expands and contracts in response to the pressure change of the discharge air, so that there is a problem that the flexible tube is damaged depending on the use conditions.

In the present invention, the discharge pipe 7 is divided into three parts as shown in FIG. 1, and the primary discharge pipe 31 and the secondary discharge pipe 3 are provided.
The second and third discharge pipes 33 are used. A discharge flange 24 is provided at the discharge port of the compressor body 1, and the compressor body 1 and the discharge flange 24 are handled as an integrated product when the compressor body is attached and detached. The inlet and outlet of the three discharge pipes 31, 32 and 33 are provided with an inlet flange and an outlet flange for connecting with each other. further,
A lap joint is provided at the inlet of each of the discharge pipes 31, 32, and 33, and the mounting hole for the bolt 25 of the outlet flange is a long hole. The discharge pipes 31, 32, 33 are made of a material such as stainless steel, and packing 27 is sandwiched between the discharge pipes and fixed with four bolts 25 and nuts 26.

In order to explain the structure of the discharge pipe in more detail, FIGS. 3 and 4 show the structure of the primary discharge pipe 31 as an example. The primary discharge pipe 31 is composed of a primary inlet flange 41 (a single piece structure is shown in FIG. 3), a lap joint 61, a steel pipe 62, an elbow 63, and an outlet flange 51.
Except for the primary inlet flange 41, it has a welded integral structure, and the inner peripheral surface 65 of the center hole of the primary inlet flange 41 is
And there is a gap between the straight pipe outer peripheral surface 66 of the lap joint 61 and the primary inlet flange 41 is the lap joint 61.
The structure is such that it can rotate around the tube axis direction (X direction).
Further, the bolt mounting hole 64 of the primary outlet flange 51 is made a long hole so that the mating flange (secondary inlet flange 41) is displaced (shifted) to be mounted.

Next, the structure of each discharge pipe will be described with reference to FIG. 1, but the contents of the primary discharge pipe 31 will be duplicated.
The primary discharge pipe 31 is provided with a primary inlet flange 41 rotatable around the X-axis direction, the secondary discharge pipe 32 is provided with a secondary inlet flange 42 rotatable around the Y-axis direction, and the tertiary discharge pipe 33 is provided at the tertiary discharge pipe 33. A tertiary inlet flange 43 rotatable about the Z-axis direction is provided. Further, the primary discharge pipe 31 is provided with a primary outlet flange 51 which is displaceable in the X-axis direction, the secondary discharge pipe 32 is provided with a secondary outlet flange 52 which is displaceable in the Y-axis direction, and the tertiary discharge pipe 33 is provided with Z. An axially displaceable tertiary outlet flange 53 is provided.

If one flange of the mating device (the outlet flange 28 of the discharge flange 24) is fixed, the flange of the mating device on the other side, that is, the inlet flange 22 of the high precooler 8 is free from assembly and manufacturing errors. The degree of freedom is a total of six degrees of freedom including the degree of freedom of position in the X, Y, and Z directions and the degree of freedom in the direction of the normal to the flange surface (degree of freedom of inclination, number of degrees of freedom 3).

On the other hand, the discharge pipe of the present invention has a three-piece divided structure, and the divided discharge pipes 31, 32, 3 are divided.
In the state where 3 is assembled, the primary outlet flange 41 of the primary discharge pipe 31 that mates with the mating device flange 28, the tertiary outlet flange 43 of the tertiary discharge pipe 33 that mates with the mating flange 22 on the other side is rotatable in the middle. By rotating the three inlet flanges 41, 42, 43, X, Y,
It can rotate around the Z-axis direction and can tilt in any direction. Further, by displacing and fixing the positions of the outlet flanges 51, 52, 53 on the way using the mounting elongated holes, the tertiary outlet flange 43 is moved in the three axial directions of X, Y, Z with respect to the primary inlet flange 41. It can be displaced. Therefore, the tertiary outlet flange 43 has six degrees of freedom, and it is possible to match the position and inclination of the flange surface of the mating device, that is, the high precooler inlet flange 22.

Therefore, if the discharge pipe of the present invention is used, the compressor main body outlet flange 21 and the high precooler inlet flange 22 which are the counterpart devices are used without using the flexible pipe.
It is possible to absorb the assembling error and the manufacturing error of the position (including the inclination) and the manufacturing error of the discharge pipes 31, 32, 33 themselves.
In addition, the discharge pipes 31, 32, 33 and the compressor body 1,
It is possible to suppress an increase in internal load caused by forcibly mounting the discharge flange 24, the high precooler 8 and the like on each device, and to improve the workability of assembling the discharge pipes 31, 32 and 33.

[0020]

According to the present invention, in the discharge gas pipe of the oilless screw compressor, since the position and angle of the X, Y, and Z axes with respect to the three axial directions can be finely adjusted, the position and inclination of each device on the other side can be adjusted. It is possible to cope with misalignment and it is possible to greatly improve the assembling property. Further, it has sufficient strength against the change in pressure of the discharge gas, and can further suppress the generation of internal load of each device including the discharge gas pipe during assembly.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure and a mounting position of a discharge pipe of an oil-free screw compressor of the present invention.

FIG. 2 is an explanatory view showing the structure of a discharge pipe of the present invention.

FIG. 3 is an explanatory view of an inlet flange which is one component of the discharge pipe of the present invention.

FIG. 4 is a system diagram of an oil-free screw compressor of the present invention.

[Explanation of symbols]

1 ... Compressor body, 7 ... Discharge pipe, 8 ... High precooler,
18 ... Cooler, 31 ... Primary discharge pipe, 32 ... Secondary discharge pipe, 33 ... Tertiary discharge pipe, 41 ... Primary inlet flange, 5
1 ... Primary outlet flange.

Claims (1)

[Claims] 1. An oil-free screw compressor having a gas compressor, a cooler for cooling the gas whose pressure is increased, a discharge gas pipe connecting the gas compressor and the cooler, and the like. The discharge gas pipe is divided into a plurality of discharge gas pipes so as to have a straight pipe part in two or more directions and one or more curved pipe parts, and flanges are provided at the inlet and outlet parts of the divided discharge gas pipe. A mechanism was provided in which at least one of the flanges was able to rotate around the pipe axis direction, and the divided discharge gas pipes were configured so that the directions of the rotary axes of the respective flanges differed by 90 ° and were at least three axial directions. An oil-free screw compressor characterized by.