Double-stage compressor plant

FIELD: engines and pumps.

SUBSTANCE: device is designed for use in compressor building industry in plants that operate with variable injection pressure. A double-stage compressor plant comprises compressors of the first and second stages, a driving engine, two differential mechanisms and two mechanical reducers. The differential mechanisms are assembled into a closed circuit with the help of the mechanical reducers so that the output shafts in such mechanical system are the inlet shaft of one differential mechanism, the outlet shaft of the other differential mechanism and outlet shafts of the mechanical reducers. The shaft of the driving engine is connected to the inlet shaft of one differential mechanism, the outlet shaft of the first stage compressor is connected to the outlet shaft of one of the mechanical reducers, and the outlet shaft of the second stage compressor is connected to the outlet shaft of the second differential mechanism. The output shaft of the other mechanical reducer is connected to the shaft of the braking device. This makes it possible to increase the range of automatic control of the compressor plant efficiency as a whole.

EFFECT: invention makes it possible to set a rational range of automatic control of pressure ratios between compression stages during operation of the compressor plant for a grid with variable pressure.

2 dwg

 

The invention relates to a compressor engineering and can be used for plants operating with a variable discharge pressure, for example, when working on a network with rapidly and significantly changing the flow rate. It can be used on the vast majority of enterprises of mining, metallurgical, machine-building, food, woodworking and other industries, as well as in construction and railway transport.

Known compressor unit consisting of a compressor of the first and second stages, which are driven from the rotor and contrator (rotating stator) (SU 282574, 28.09.1970).

The speed of rotation of the shafts of compressors depend on speed of rotation of the rotor and contrator respectively and redistributed among themselves depending on the ratio of the output pressure of the compressor. When increasing the output pressure of the compressor of the second stage speed contrator and accordingly the shaft of the compressor of the second stage is reduced, which leads to an increase in the speed of rotation of the rotor, and hence increase the speed of rotation of the shaft of the first stage compressor. Because the performance of the unit as a whole is determined by the performance of the first stage compressor, resulting in increasing pressure on the network on which the work is t this compressor unit, the performance increases.

Also known compressor unit consisting of a compressor of the first and second stages, which are driven from the shaft of DC motor connected in the circuit diagram of the differential (SU 282575, 30.11.1971).

It works similarly. In this setting the speed of rotation of the shafts of compressors depend on speed of rotation of the respective shafts DC motors and redistributed among themselves depending on the ratio of the output pressure of the compressor. When increasing the output pressure of the compressor of the second stage shaft rotation speed of the corresponding motor and, consequently, the shaft of the compressor of the second stage is reduced, which leads to an increase in the speed of rotation of the shaft of the other motor, and hence increase the speed of rotation of the shaft of the first stage compressor. As a result, when the increase of pressure in the network, which works in this compressor, the performance increases.

A prototype of the selected two-stage compressor unit that contains the compressor of the first and second stages, the drive motor and a differential mechanism (SU 282576 A, 30.11.1971).

The principle of operation of this installation is also similar to the above-mentioned two units. With increasing pressure the Oia discharge decreases the rotation speed of the compressor of the second stage and increase the speed of rotation of the shaft of the first stage compressor, that leads to higher performance of the compressor as a whole.

The disadvantages of the prototype are a small range of automatic capacity control of the compressor as a whole and it is impossible to establish a rational range of automatic regulation of the pressure ratio through the stages of compresirovannija.

The objective of the invention is to increase the range of automatic capacity control of the compressor as a whole and the possibility of establishing a rational range of automatic regulation of the pressure ratio through the stages of compresirovannija.

This task and the technical result is achieved by the fact that the two-stage compressor unit that contains the compressor of the first and second stages, the drive motor and a differential mechanism according to the invention provided with an additional differential mechanism input shaft which is connected with the output shafts of the first differential mechanism via two additional mechanical gearboxes, shaft of the first stage compressor connected to the output shaft of one of the more gears, the shaft of the compressor of the second stage connected to the output shaft of the additional differential mechanism and the output shaft of another additionally is th gear is connected with the brake device

Figure 1 shows a schematic diagram of the compressor, adopted for the prototype. The installation includes the compressors 1 and 2, respectively, the first and second stages and the intermediate cooler 3. The engines are the engine 4 with a differential mechanism 5, the output shafts 6 and 7 which are connected to the compressors 1 and 2.

Setup works as follows. The air at suction pressure enters the compressor 1 is compressed to a pressure Pxcomes in refrigerator 3 and from there to the compressor 2, where it is compressed to a discharge pressure P2. The speed of rotation of the shafts of compressors depend on speed of rotation shafts of the differential and redistributed among themselves depending on the ratio R2and R1so that with increasing P2the speed of rotation of the shaft 7 of the differential and the shaft of the compressor 2 is reduced and the speed of rotation of the shaft 6 differential and shaft of the compressor 1 is increased. Therefore, increase in the productivity of the installation, because performance is determined by the number of revolutions of the compressor of the first stage.

Figure 2 shows a schematic diagram of the proposed compressor unit.

The invention consists in that the drive installation is equipped with an additional differential mechanism input shaft is connected with the output of the diversified shafts of the first differential mechanism by means of two additional gears, and the shafts of compressors are driven from the output shaft of the additional differential mechanism and the output shaft of one of the additional gears, respectively. The output shaft of the other additional gear is rigidly connected to the brake device designed to establish a specific range of automatic regulation of the pressure ratio through the stages of compresirovannija.

The installation includes the compressors 1 and 2, respectively, the first and second stages and the intermediate cooler 3. The compressors are driven by a motor 4 through a system of two parallel-connected differential mechanisms 5 and 6 and associated with the last additional mechanical gears 7 and 8, having three (1 input and 2 output) shaft. The input shaft 9 of the differential mechanism 5 is connected to the shaft of a drive motor 4, and the output shafts 10 and 11 of the differential mechanism 5 is connected to the additional mechanical gears 7 and 8 separately. The output shafts 12 and 13 of the differential mechanism 6 is also connected to the additional mechanical gears 7 and 8 separately. The output shaft 14 of the differential mechanism 6 is connected to the shaft of the compressor 2. Free output shaft 15 additional mechanical gear 7 is connected with the shaft of the compressor 1, and the free output shaft 16 on the additional mechanical gear 8 is connected with the input shaft 1 7 brake device 18.

The device operates as follows.

The air in the suction pressure P1enters the compressor 1 is compressed to a pressure Pxcomes in refrigerator 3 and from there to the compressor 2, where it is compressed to a discharge pressure P2.

The speed of rotation of the shafts of compressors depend on speed of rotation shafts of the differential mechanism 6 and redistributed among themselves depending on the ratio R2and R1as follows.

With increasing P2the speed of rotation of the compressor shaft 2 and the shaft 14 of the differential mechanism 6 is reduced and the speed of rotation of the shaft 12 of the differential mechanism 6, and hence the shaft 15 additional mechanical gear 7 will increase. This will lead to an increase in the rotation speed of the compressor 1. Consequently, this will increase the plant capacity, because performance is determined by the number of revolutions of the compressor of the first stage.

However, the magnitude of the rotational speeds of the shafts 12 and 14 of the differential mechanism 6 will depend on the speed of rotation of the shaft 13 of the differential mechanism, and this speed can be pre-set by using the impact on output shaft 16 additional mechanical gearbox 8 brake torque generated by the brake unit 18. Deceleration is the principal device 18 can be any device for PTO, for example, fan, water pump, generator, etc. In the simplest case, this may be the clutch or powder clutch.

Pre-setting the speed of rotation of the shaft 13 of the differential mechanism 6 by means of a braking device creates the ability to customize the most rational mode of the ratio of the speeds of rotation of shafts 12 and 14 of the differential mechanism 6, therefore, the most rational mode ratio R2and P1when the operation of the compressor installation on a network with a variable pressure.

Loss of power to the brake device 18 are not irretrievably lost, because depending on the structural design of the braking device, its power can be useful. For example, in the case of use as a braking device of the fan you can use it to blow in the working cylinder or radiator intermediate fridge. In the case of use as a braking device of the hydraulic pump can also be used for liquid cooling of the working cylinder or radiator intermediate fridge. In the case of use as a braking generator it can be used for power control devices and other devices.

For pre-installation and subsequent regulated the I operation mode of the compressor on the network with variable pressure (even on the fly), you can use the known device: chokes for fan and water pump, dimmer for electric power generation, etc.

Advantages of the proposed device are increasing the range of automatic capacity control of the compressor as a whole and the possibility of establishing a rational range of automatic regulation of the pressure ratio through the stages of compresirovannija during operation of the compressor on the network with a variable pressure.

Such plants are able to more accurately track the fluctuations of the flow rate without changing the rotation speed of a drive motor. They minimize energy consumption due to the fact that completely cease to consume energy during unloading, as well as provide smooth control performance in a wide range and reducing the number of starts.

Two-stage compressor unit that contains the compressor of the first and second stages, the drive motor and the differential mechanism, characterized in that it is equipped with an additional differential mechanism input shaft which is connected with the output shafts of the first differential mechanism through 2 additional mechanical gearboxes, shaft of the first stage compressor connected to the output shaft of one of the more gears, the shaft of the compressor of the second stage connected to the output shaft facilities is tion of the differential mechanism, and the output shaft of the other additional gear is connected with the braking device.



 

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FIELD: engineering industry.

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EFFECT: reducing the probability of occurrence of acoustic and mechanical resonances.

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