JPH10252681A - Turbo compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compact a turbo compressor and to provide structure where an assembly and disassembly work is facilitated. SOLUTION: A turbo compressor is formed such that a motor case 8 to contain a motor 1 forms integral structure in a peripheral direction, a low pressure stage case containing an impeller 6 is divided into upper and lower cases 13a and 13b, and a high pressure stage case containing an impeller 7 is divided into upper and lower cases 14a and 14b. Both the lower cases 13b and 14b are formed integrally with the motor case 8, and also structured integrally with a cooler case 15. Meanwhile, the upper cases 13a and 14b are removablly mounted and during assembly and disassembly, with the upper case removed, a work is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a turbo compressor, and more particularly to a turbo compressor suitable for use as an oilless compressor for supplying compressed air.

[0002]

2. Description of the Related Art As a turbo compressor used for supplying compressed air or the like, for example, "Turbomachinery internation"
al March / April 1994 and Sulzer's catalog ", it has a structure in which an impeller is mounted on a rotor of a high-speed motor supported by magnetic bearings.

FIG. 3 shows a schematic structure and a flow of such a conventional high-speed motor compressor, and FIG. 4 is a sectional view showing the structure. High-speed motor 1 (Fig. 3)
Is composed of a coil 1a on the stator side and a coil 1b on the rotor 2 side. A rotor 2 driven by the high-speed motor 1 has a low-pressure stage impeller 6 and a high-pressure stage impeller 7 mounted at both ends. I have. The rotor 2 is supported by radial bearings 3 and 4 and a thrust bearing 5, and the motor 1, the rotor 2, and the bearings 3 and 4 are housed in a motor case 8. The compression stage incorporating the impeller 6 is provided in the case 9,
The compression stages incorporating the impeller 7 are combined in a case 10. An intercooler 11 is connected between the cases 9 and 10 via flanges 20 and 21, and the gas compressed by the impeller of the low pressure stage is sent from the inside of the case 9 to the intercooler 11, where the gas is compressed. It is cooled and sucked into the case 10. The sucked gas is supplied to the impeller 7 of the high pressure stage.
Is compressed again until it reaches the pressure specified in the specification, and is cooled and taken out by the aftercooler 12.

[0004]

In the above-described turbo compressor having the conventional structure, the motor case 8 and the cases 9 and 10 of the compression stage are integrally formed in the circumferential direction. For this reason, when assembling this compressor, it is necessary to first install the motor 1 and then attach the cases 9 and 10 from both sides of the rotor 2 in the axial direction. That is, the cases 9 and 10 are fitted from the left and right (of FIG. 4) so that the rotor 2 is inserted therein, and are connected to the motor case 8 by bolts or the like. When the compressor is disassembled, the cases 9 and 10 are disconnected from the motor case 8 and then the cases 9 and 10 are respectively moved in the axial direction of the rotor until the rotor 2 does not enter the inside thereof. Remove. In order to perform such an assembling or disassembling operation, the intercooler 11 and the cases 9, 10 and the like cannot be integrally formed as shown in the structural diagram of FIG. A detachable connecting means was provided, and connection or detachment of these flanges 20 and 21 was required every time assembly or disassembly was performed. For this reason, there has been a problem that the compressor cannot be made compact as a whole and that the assembling / disassembling operation requires time and effort.

An object of the present invention is to provide a turbo compressor having a compact structure and a structure capable of performing assembling / disassembling operations in fewer steps.

[0006]

According to the present invention, a gas is sucked by a low-pressure stage compression section, compressed by an impeller, and the compressed gas is cooled by an intercooler and then further compressed by an impeller of a high-pressure stage compression section. In a turbocompressor configured to output the compressed gas by cooling the compressed gas by an aftercooler, the impeller of the low-pressure stage and the high-pressure stage compression unit is attached to both ends of the rotor, and A motor case for accommodating a motor for driving the vehicle is integrally formed in a circumferential direction, and each of the low-pressure stage case and the high-pressure stage case for accommodating each of the low-pressure stage and the high-pressure stage compression unit is raised. A half-split structure divided into a case and a lower case, wherein the lower case of the low-pressure stage case and the lower case of the high-pressure stage case are integrally formed with the motor case; And a cooler case accommodating the aftercooler and an upper case, and each of the upper case of the low-pressure stage case and the upper case of the high-pressure stage case has a structure detachable from each of the corresponding lower cases. Disclose.

[0007]

Embodiments of the present invention will be described below. FIG. 1 is a diagram showing a configuration example of a turbo compressor according to the present invention, and FIG. 2 is a side view as seen from the AA direction in FIG.
In FIG. 1, the upper part of the center axis of the rotor 2 is illustrated as an internal sectional view, and the lower part of the center axis of the rotor 2 and the intercooler and the aftercooler are illustrated as viewed from the outside of the case. In FIG. 1, a motor 1, a rotor 2, radial bearings 3, 4, a thrust bearing 5, and impellers 6, 7 have the same structure as the conventional ones shown in FIGS.

A feature of the present invention is the structure of a case for accommodating them. First, a motor case 8 that covers the motor 1 has a circumferentially integral structure as in the conventional case, but has a low-pressure stage impeller 6.
Is divided into an upper case 13a and a lower case 13b, and the lower case 13b is integrated with the motor case 8. Similarly, the case that covers the high-pressure impeller 7 is divided into an upper case 14a and a lower case 14b.
b is also integral with the motor case 8. Further, the lower case 13b, 14b also forms a flow path connecting the cooler and the compression stage, and the cooler case 15 accommodating the intercooler 11 and the after cooler 12 is also of an integral structure. Thus, the case of each compression stage has a half-split structure, and the upper cases 13a and 14a are independent cases, and the bolts 23, 2
3 and bolts 24, 24 ... are detachably attached to the internal structure of each compression stage. The upper case 14a
Are detachably connected to the lower case 14b by bolts 25 at the flange portions of both cases as shown in FIG. This is the same for the upper case 13a and the lower case 13b.

At the time of assembling the turbo compressor having the above-described case structure, first, the motor 1, the motor side of the thrust bearing 5, the rotor 2, and the radial side of the opposite side of the motor of the thrust bearing 5 are provided inside the motor case 8. The members including the bearings 3 and 4 are assembled in this order. However, there is no thrust bearing 5 on the low pressure stage side. After the assembly of the motor unit is completed, the compression stage is assembled next. Here, the low-pressure stage will be described. For this purpose, first, the rotating side component (seal disk) of the sealing device 16 is assembled into the rotor, and then the impeller 6 is assembled and fastened to the rotor by a blade nut. Next, the upper half of the stationary part of the sealing device 16 is
a, and the upper case 13a is attached to the lower case 13
b. When a sealing structure between the inside and the outside of the compression stage on the back side of the impeller 6 is formed in this way, the suction-side stationary component 21 of the impeller 6 is then replaced with the lower case 13 b and the upper case 13.
Assemble from the axial direction according to the inner diameter formed by a. The suction-side stationary component 21 has an integral structure in the circumferential direction, and is fixed to the flange portion of the upper case 13a with a bolt or the like. The suction-side stationary component 21 has an inner diameter part that forms a suction flow path of the impeller 6, and an outer diameter part that forms the upper case 13.
a, a discharge channel is formed with the lower case 13b.

The assembly of the low-pressure stage is performed as described above. The assembly of the high-pressure stage is performed in the same manner. The sealing device 17 and the impeller 7 are assembled, and then the suction-side stationary part 22 of the impeller 7 is assembled. However, in the high-pressure stage, a portion between the outer diameter portion of the suction-side stationary component 22 and the upper case 14a and the lower case 14b forms a suction flow path, and the inner diameter portion forms a discharge flow path to the compressed air supply port. linked.

Although the method of assembling the turbo compressor according to the present embodiment has been described above, the operation may be performed in the reverse order to the above at the time of disassembly. Then, the upper case 13a of each compression stage can be used without removing the intercooler or the aftercooler.
Since the internal assembly / disassembly can be performed only by attaching / detaching the unit 14a and 14a, the work becomes easy and at the same time the structure of the device itself becomes compact.

[0012]

According to the present invention, there is an effect that a turbo compressor having a compact structure which can be easily assembled / disassembled is realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a turbo compressor according to the present invention.

FIG. 2 is a side view of the turbo compressor of FIG. 1 as viewed from the AA direction.

FIG. 3 is a diagram showing a schematic configuration and a flow of a conventional turbo compressor.

FIG. 4 is a cross-sectional view illustrating a structure of a conventional turbo compressor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 motor 2 rotor 3, 4 radial bearing 5 thrust bearing 6, 7 impeller 8 motor case 11 intercooler 12 aftercooler 13 a, 14 a upper case 13 b, 14 b lower case 15 cooler case 16, 17 sealing device 21, 22 suction side stationary parts

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naohiko Takahashi 603, Kandachicho, Tsuchiura-shi, Ibaraki Pref.

Claims (3)

[Claims] 1. A gas is sucked by a low-pressure stage compression section, compressed by an impeller, the compressed gas is cooled by an intercooler, and further compressed by an impeller of a high-pressure stage compression section, and the compressed gas is cooled by an aftercooler. In the turbocompressor configured to output compressed gas by cooling, the impellers of the low-pressure stage and the high-pressure stage compression unit are attached to both ends of the rotor, and a motor that drives the impeller is provided therein. The motor case for accommodating the low-pressure stage and the high-pressure stage compression unit for accommodating each of the low-pressure stage and the high-pressure stage compression unit is divided into an upper case and a lower case. The lower case and the lower case of the high-pressure stage are integrated with the motor case, and house the intercooler and the aftercooler. A turbo compressor, wherein each of the low-pressure stage case and the high-pressure stage case has a structure detachable from a corresponding lower case. 2. The low-pressure stage case and the high-pressure stage case,
2. The turbo compressor according to claim 1, wherein each case is divided into two parts by a horizontal plane and divided into the upper case and the lower case. 3. The low-pressure stage case and the high-pressure stage case lower case are configured to form a gas flow path between the intercooler and aftercooler and the low-pressure stage compression unit and the high-pressure stage compression unit. The turbo compressor according to claim 1, wherein: