CN101092969A - Turbocharger sealing structure and method thereof - Google Patents

Abstract

The invention relates to a sealing structure of a turbocharger, which is characterized in that the sealing of the compressor: a V-shaped sealing ring is installed on the outer sleeve of the rotor shaft in the cover seat, and the end surface of the graphite sealing ring is adhesively connected with the supporting end surface of the rotor shaft without gaps. The end face of the graphite sealing ring is softly and tightly combined with the end face of the rotor shaft through the low-pressure spring and the spring retainer arranged in the plug seat. The turbocharger sealing method of the present invention: seal the compressor, put the prepared V-shaped rubber sealing ring on the outer sleeve of the rotor shaft in the cover seat; adhere the end face of the graphite sealing ring to the supporting end face of the rotor shaft without gap At the same time, the end face of the graphite sealing ring and the end face of the rotor shaft are softly and tightly combined through the low-pressure spring and spring retainer installed in the plug seat. It ensures the sealing quality of the turbocharger, avoids oil leakage, improves the service life of the turbocharger, and makes the turbocharger work in the best condition.

Description

Turbocharger sealing structure and method thereof

technical field

The invention relates to a turbocharger sealing technology, in particular to a turbocharger graphite sealing structure and a process method thereof.

Background technique

Turbocharger is the most effective measure to increase engine power and improve economy, and it is also an inevitable way to strengthen the engine. It has become an important direction for the development of internal combustion engines and is widely used in the fields of miniature cars and heavy trucks. Turbochargers have been As one of the important parts of the engine, it needs to be continuously improved in terms of its performance and durability. The sealing structure of the turbocharger prevents the lubricating oil of the bearing body from entering the circulation part of the supercharger, and prevents the air of the compressor or the gas at the turbine end from entering the lubricating oil chamber of the supercharger, which is an important factor to ensure the normal operation of the supercharger. links. At present, the seals of superchargers mainly include piston ring seals, graphite ring contact seals and lip seals. When the booster throttle of the gasoline engine is closed, the pressure on the back of the compressor impeller will be much lower than the pressure in the bearing body. The impeller works under a relatively large negative pressure, and the pressure difference can be as high as 80kpa. At this time, the piston seal structure cannot guarantee effectiveness. The seal needs to use graphite ring contact seal. Ordinary graphite ring seals are susceptible to thermal backflow and affect the adhesion to the end face of the turbine, and the mechanical loss is large, and the turbine lag is also large. In order to ensure high sealing performance, there are also double-piston ring sealing methods with a relatively complex structure. In a word, the sealing structure has always been the weak link of the turbocharger, which needs continuous improvement to ensure the normal operation of the turbocharger.

Contents of the invention

Aiming at the above-mentioned existing technical problems, the present invention provides a turbocharger graphite sealing structure and method thereof with simple structure, reliable sealing performance and low mechanical loss.

The technical scheme of the turbocharger sealing structure of the present invention is as follows:

A sealing structure for a turbocharger, including a turbine shell and a compressor impeller, characterized in that: for the seal of the compressor, a V-shaped sealing ring is installed on the outer rotor shaft sleeve in the plugging seat, and the end face of the graphite sealing ring is connected with the supporting end face of the rotor shaft There is no gap in the adhesive connection, and the end face of the graphite sealing ring is softly and tightly combined with the end face of the rotor shaft through the low-pressure spring and the spring stopper set in the cover seat.

Turbocharger sealing method of the present invention is as follows:

To seal the compressor, put the prepared V-shaped rubber sealing ring into the outer sleeve of the rotor shaft in the cover seat;

Adhere the end face of the graphite sealing ring and the supporting end face of the rotor shaft without gaps, and make the end face of the graphite sealing ring softly and tightly combined with the end face of the rotor shaft through the low-pressure spring and spring retainer installed in the cover seat.

Advantages and effects of the present invention are as follows:

The present invention overcomes the unreliable sealing performance of the turbocharger in the prior art and the problems of easy oil leakage, and adopts the non-gap sealing of the graphite sealing ring and the non-gap sealing of the rubber sealing ring to ensure the turbocharger. The sealing quality avoids oil leakage, improves the service life of the supercharger, and makes the turbocharger work in the best condition.

Description of drawings

Fig. 1 is a schematic diagram of a turbocharger sealing structure of the present invention.

FIG. 2 is a side view of FIG. 1 .

In the figure: 1. V-shaped sealing ring, 2. Graphite sealing ring, 3. Low pressure spring, 4. Spring stopper, 5. Blocking cover seat.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

The sealing structure of the turbocharger of the present invention is shown in Figure 1, and the compressor is sealed by a sealing method combining graphite and rubber. Adhesive connection with the supporting end face of the rotor shaft without gap, the end face of the graphite sealing ring 2 is softly and tightly combined with the end face of the rotor shaft through the low pressure spring 3 and the spring stopper 4 provided in the cover seat 5 .

Turbocharger sealing method of the present invention is as follows:

To seal the compressor, put the prepared V-shaped rubber sealing ring 1 into the inner rotor shaft outer casing of the cover seat 5; On the one hand, it is closely combined with the inner hole of the graphite sealing ring to play a double sealing role;

Adhere the end face of the graphite seal ring 2 and the end face of the rotor shaft without gaps, and make the end face of the graphite seal ring 2 soft and tight Combined to ensure the reliable sealing of the compressor under the condition of large pressure difference.

The V-shaped sealing ring is made of hydrogenated nitrile rubber, which makes the contact point soft and can change with the contact surface. The production of graphite sealing rings requires that the graphite surface be flat and smooth as a mirror. The low-pressure spring is used to make the elastic force soft and ensure reliable sealing.

Claims (2)

1. A turbocharger sealing structure is characterized in that the sealing of the compressor: the V-shaped sealing ring (1) is put into the inner rotor shaft sleeve of the plug seat (5), and the end face of the graphite sealing ring (2) is connected to the rotor shaft. The end surface of the support is adhesively connected without gaps, and the end surface of the graphite sealing ring (2) is softly and tightly combined with the end surface of the rotor shaft through the low-pressure spring (3) and the spring stopper (4) arranged in the cover seat (5). 2, a turbocharger sealing method, is characterized in that adopting following steps: To seal the compressor, put the prepared V-shaped rubber sealing ring into the outer sleeve of the rotor shaft in the cover seat; Adhere the end face of the graphite sealing ring and the supporting end face of the rotor shaft without gaps, and make the end face of the graphite sealing ring softly and tightly combined with the end face of the rotor shaft through the low-pressure spring and spring retainer installed in the cover seat.

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