Turbocompressor-gas-expansion machine

FIELD: transport engineering.

SUBSTANCE: invention relates to low-capacity turbocompressors-gas-expansion machines for transfer of hot contaminated gas-air mixture and for cooling air in vehicle air conditioning and air cooling system. proposed turbocompressor-gas-expansion machine has housing accommodating shaft installed inside housing on antifriction bearings with fitted on wheels of compressor and turbine-gas-expansion machine secured on ends of shaft. Bearings are grease packed. Bearing unit from side of compressor is installed with clearance relative to housing. clearance is divided by partition made of heat-insulating material into two spaces. Space from side of bearing unit communicates with atmosphere and with outlet of turbine-gas-expansion machine for cooling bearing by part of cooled air flow. Space from side of compressor is sealed to play part of heat shield.

EFFECT: simplified design, reduced overall dimensions of turbocompressor-gas-expansion machine, provision of normal temperature conditions for operation of bearing.

3 cl, 1 dwg

 

The present invention relates to refrigeration, and in particular to the turbo-expanders low productivity for pumping hot contaminated gas mixture and cooling air conditioning system and air cleaning of the vehicle.

Known Turkologist containing the oil pan and installed the shaft bearings located on it impellers of the turbine and compressor, made in the bearing housing longitudinal channels for the cooling air and the inlet of the turbine with nozzle device [USSR Author's certificate No. 172952, CL F04D 29/58, 1964].

The disadvantage of turboalternator is that the temperature of the cooling air during operation increases as part of the cooling air circulates in a closed circuit, which reduces the efficiency of cooling the bearing housing.

As a prototype selected turbofan, containing the oil pan and installed the shaft bearings located on it impellers of the turbine and fan, made in the bearing housing longitudinal channels for cooling air, and the sump is located in the inlet pipe of the turbine having an eccentric annular channel for supplying air to Solovay apparatus turbines [Author svidetel is in the USSR # 172952, CL F04D 29/58, 1964].

A disadvantage of the known device is the design complexity and large size due to the presence of complex and bulky oil pan, and the inability to use the turbo fan for pumping hot contaminated gas mixture and cooling air conditioning system and air cleaning of the vehicle because of the possibility of getting contaminated gas mixture and drops of oil in the highway clean cooled air.

The task to be solved by the invention is the simplification and reduction of the dimensions of the design of the turbo-expander by using compact high-speed bearings with grease and ensure the normal temperature operating conditions of bearings.

The problem is solved in that the turbo-expander, mainly for pumping hot contaminated gas mixture and cooling air conditioning system and air cleaning vehicle, comprising a housing installed inside on ball bearings shaft attached to the ends of the impellers of the compressor and the turbine-expander according to the invention, the bearings are constructed with grease, bearing unit with the parties of the compressor is installed with a clearance relative to the housing, the gap is divided by a partition of insulating material into two cavities, the cavity side of the bearing unit in communication with the atmosphere and with the outlet of the turbine-expander with cooling of the bearing part of the stream of cooled air, and the cavity side of the compressor is airtight with the ability to perform the functions of a heat shield.

To improve cooling of the bearings on the end face of the bearing unit side walls made ribbing.

For enhanced cooling by creating turbulence in the air flow fins made in the form of concentric annular projections.

Comparative analysis of the proposed turbo-expander with prototype and other solutions in this field of technology shows that set forth in patent formula, the set of features not known from the existing art, on the basis of what can be concluded about its compliance with the criteria of the invention of "novelty."

When this is set out in the formula of the set of features not obvious to a person skilled from the current level of technology that allows to make a conclusion on the conformity of the decision criterion of the invention "inventive step".

Compliance with the proposed solution the criteria of the invention "industrial applicability" seen from below is shown the specific example of the turbo-expander.

The invention is illustrated by the drawing, which schematically represented in the turbo-expander in the section.

The list of symbols on the drawing:

1 - body;

2 - bearing;

3 - shaft;

4 - the impeller of the compressor;

5 - impeller turbine-expander;

6 - compressor;

7 - turbine-expander;

8 - bearing unit;

9 - wall;

10, 11 - cavity;

12 - channel.

The turbo-expander includes a housing 1 mounted inside the bearing 2 shaft 3 attached to the ends of the impellers 4, 5 compressor 6 and the turbine-expander 7, respectively. The bearing 2 is made with grease and mounted in a bearing unit 8. Bearing unit 8 from the compressor 6 is installed with a clearance relative to the housing 1. When this gap is divided by a partition 9 of insulation material on the two cavities 10 and 11. The cavity 10 from the side of the bearing unit 8 communicates with the atmosphere and with the outlet of the turbine-expander 7 and the cooling of the bearings 2 part of the stream of cooled air. The cavity 11 from the compressor 6 are sealed with the ability to perform the functions of a heat shield. For the passage of air into the cavity 10 in the node 8 is made channels 12.

The operation of the turbo-expander is as follows.

Work the net who is uh, passing through the turbine-expander 7, rotates the impeller 5 and is cooled. Through the shaft 3, the rotation of the wheel 5 is transmitted to the impeller 4 of the compressor 6, engaged in pumping hot and contaminated air / gas mixture. Part of the flow of cooled air (about 10%) from the outlet of the turbine-expander 7 is fed into the cavity 10, cools the bearings 2 and prevents the ingress of possible leaks of contaminated gas mixture through the bearing unit 8 turbine-expander 7 (highway clean air). The presence between the bearing unit 8 and the compressor 6 of the partition 9 and the air cavity 11 provides thermal insulation of the bearing unit 8 on the hot side of the compressor 6.

The use of the invention can significantly improve the physical characteristics of the turbo-expander and to simplify its design. The presence of insulation and air cooling of the bearing unit provides the right conditions for long-term operation of rolling bearings with grease.

1. The turbo-expander, mainly for pumping hot contaminated gas mixture and cooling air conditioning system and air cleaning vehicle, comprising a housing installed inside on ball bearings shaft attached to the ends number of workers who themselves compressor and turbine-expander, characterized in that the bearings are constructed with grease, bearings on the compressor side is installed with a clearance relative to the housing, the gap is divided by a partition of insulating material into two cavities, the cavity side of the bearing unit in communication with the atmosphere and with the outlet of the turbine-expander for cooling of the bearing part of the stream of cooled air, and the cavity side of the compressor is airtight with the ability to perform the functions of a heat shield.

2. The turbo-expander according to claim 1, characterized in that the end face of the bearing unit side walls made ribbing.

3. The turbo-expander according to claim 2, characterized in that the fins are made in the form of concentric annular projections.



 

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