SU1740781A1 - Compressor plant - Google Patents

Abstract

The invention relates to refrigeration engineering, reduces the pulsation of the load, reduces the noise and vibration of the installation. The driving motor with side covers and bearing bearings installed in them, in the latter there is an eccentric shaft, on the eccentric of which the rotor is located. Two counterweights and a rotor of an electric motor are mounted on the straight part of the shaft and placed into the internal stator cavity of the electric motor. In the side cover of the stator there is an elongated seat in which two main bearings are installed. An additional working module of the compressor is installed at the end of this cover, the shortened shaft of which is kinematically connected to the engine shaft by spline engagement, and the shaft eccentrics are offset relative to each other and the near counterweight by 180 °. 4 il.

Description

The invention relates to a refrigeration compressor engineering and can be used in chemical engineering,

Known compressor installation, for example, containing a drive motor, comprising a housing with side covers, installed in the latter bearing supports and placed in bearings shaft of an electric motor with an eccentric, working module of the compressor, the rotor of which is installed on the eccentric, and rigidly mounted on the shaft counterweights.

When a single compressor module is operated, a pulsating load acts on the drive motor. This leads to uneven shaft rotation, installation vibration, and noise.

A compressor installation is also known, comprising a drive motor, comprising a housing with side covers, bearing bearings installed in the latter and a shaft of an electric motor with an eccentric mounted in bearings, a working module of the compressor whose rotor is mounted on an eccentric and counter-weights rigidly mounted on the shaft.

The disadvantages of the installation are increased vibration and noise due to the uneven loading of the drive motor. In addition, in one compressor module, it is difficult to obtain a significant cooling capacity.

The purpose of the invention is to increase the cooling performance and reduce vibration and noise.

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The goal is achieved by the fact that a compressor installation comprising a drive motor, including a housing with side covers, bearing bearings installed in the latter and a shaft of an electric motor with an eccentric mounted in bearings, a working module of the compressor whose rotor is mounted on an eccentric, and rigidly mounted on the shaft, equipped with an additional working module of the compressor, installed opposite to the main working module on the side cover, the shaft of the module is fixed at one end to the bearing the module's support, and the other in the bearing support of the electric motor, the shafts of the engine and the additional module are kinematically connected by spline engagement, and the eccentrics of the shafts are offset from each other and the near counterweight by 180 °.

The presence of two compressor modules in the installation allows in a wide range to increase the flow (cooling capacity). Shifting the eccentric shafts allows the drive motor to be more evenly loaded. This will lead to a more uniform rotation of the shafts, reducing vibration and noise.

FIG. 1 shows a compressor installation, a longitudinal section; in fig. 2 - balancing scheme for compressor rotors; in fig. 3 shows section A-A in FIG. one; in fig. 4 is a cross-section BB in FIG. one.

The compressor installation contains a drive motor 1, comprising a housing 2 with side covers 3 and 4, bearing bearings 5 and 6 installed in the latter and bearing shaft 7 of an electric motor with an eccentric 8 placed in bearings, a working module of the compressor 9, the rotor 10 of which is mounted on an eccentric 8, and counterweights 11 and 12 which are rigidly mounted on the shaft. The installation is equipped with an additional working module 13 installed opposite to the main working module 9 on the side cover 4. The shaft 14 of module 13 is fixed at one end in the bearing support 15 mo 13 and another in the bearing support 16 of the electric motor 1. The shafts of the engine 7 and the additional module 14 are kinematically connected by means of the spline engagement 17, and the eccentrics 8 and 18 of the shafts 7 and 14 are displaced one after the other and the counterweight (11 or 12) at 180o. On the eccentric 18 mounted rotor 19 module 13.

In the motor housing 2, an inlet channel 20 is provided, cooling channels 21 and 22 connecting the inlet channel to the cavities of the stator 23 and 24. The cavities of the stator 23 and 24 through the inlet ports 25 and 26 are connected to the working cavities 27 and 28 of modules 9 and 13. In the housings of the modules 29 and 30, discharge windows 31 and 32 are made. A rotor 33 is mounted on the shaft 7 of the electric motor 1.

When the rotor 33 rotates in the compressor modules, the working volumes 27 and 28 change. As these volumes increase, the working gas (refrigerant) enters them. The working gas is sucked through the inlet channel 20, the cooling channels 21, 22, the cavities of the stator 23 and 24, the windows 25 and 26 in the cavity 27 and 28. The passage through this path, the working gas cools the electric motor 1, the covers 3 and 4 with bearing supports 5 and 6. When working volumes 27 and 28 are reduced, gas is compressed and pushed out through the discharge ports 31 and 32 into the refrigeration system. Counterweights 11 and 12 balance eccentrics 8 and 18c with rotors 10 and 19. For static balancing the following conditions must be met.

miei + tpr2 / 92 t2v2 + mnpipi, where mi, rri2 are the masses of eccentrics and rotors of the modules;

ei, 62 - model excursion;

Shpr1, tpr2 - weight balances;

p ffi, are the radii of rotation of the centers of mass of the counterweights.

From the expression it can be seen that it is sufficient to have the same masses and eccentricistics of the rotors of the compressors and the same counterweights for static balancing conditions to be satisfied.

For dynamic balancing, it is necessary that the sum of the moments of centrifugal forces relative to any point on the axis of rotation of the shafts be equal to 0. With equal rotors and counterweights, the dynamic balancing condition is

mieiL mnpipi I,

where L and I are the distance between the planes of rotation of the centers of gravity of rotors and counterweights.

The presence of two compressor modules in the installation allows in a wide range to increase the flow (cooling capacity). A 180 ° offset of the eccentrics allows the drive motor to be loaded more evenly, which reduces vibration and noise.

Claims (1)

Invention Formula Compressor unit, comprising a drive motor, comprising a housing with side covers, bearing bearings installed in the latter and placed in the bearings of an electric motor with an eccentric, working module compressor, the rotor of which is mounted on an eccentric, and counterweights fixed on the shaft, characterized in that, in order to increase productivity, reduce vibration and noise, the installation is equipped with an additional working module of the compressor installed opposite to the main working module on the side the lid, the module shaft is fixed at one end in the bearing support of the module, and the other in the bearing support of the electric motor, the shafts of the engine and the additional module are kinetically connected by splined engagement, and the eccentrics of the shafts are offset 180 ° from each other and the near counterweight. /ABOUT L / 2 $ 2 Bb 32 Fig.Ch Editor M. Nedolu wives to Techred M. Morgenthal Order 2068 Circulation: Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. A - A Fig 3 Proofreader M. Pojo