CN210738671U - Reduce turbine case structure of thermal stress - Google Patents

Abstract

The utility model discloses a reduce turbine case structure of thermal stress, including turbine case shell, turbine case inlet flange, engine waste gas air inlet, throat, axle sleeve hole, exhaust outlet, bearing body link, runner, its characterized in that, throat department adopts chisel vacuole structure form. Compared with the prior art, the utility model has the advantages that 1, the thermal stress concentration caused by working conditions such as temperature load and the like is reduced; 2. the failure risks of throat cracks and extension cracks of the turbine box caused by thermal stress are reduced, and the fatigue resistance of the turbine box is improved; 3. the reliability of the whole supercharger is improved.

Description

Reduce turbine case structure of thermal stress

Technical Field

The utility model belongs to automobile-used turbo charger field especially relates to a reduce turbine case structure of thermal stress.

Background art:

the waste gas turbocharger is a mechanical device for supercharging by using waste gas energy discharged by an engine, the waste gas energy of the engine is used for driving a turbine in a turbine box to rotate, the turbine drives a coaxial compressor impeller to work, fresh air enters the compressor through an air filter, and the compressor impeller rotates to compress the fresh air to achieve the effect of supercharging. The air quantity in unit volume is increased, so that fuel combustion is more sufficient, power is improved, fuel consumption rate is reduced, and tail gas emission is reduced.

The turbocharger turbine box is directly connected with an engine exhaust pipe, and is in a high-temperature, high-pressure and high-speed operation working condition when working, the working environment is very severe, and the exhaust temperature range is about 650-1000 ℃. Along with different operation conditions of starting, idling, running, stopping and the like of the engine and a working environment with alternately changed cold and heat, the complex heat transfer processes of solid-liquid heat transfer between high-temperature waste gas and the turbine box, solid-liquid heat transfer between the turbine box and the bearing body, conjugate heat transfer of a solid-liquid coupling boundary and the like are included, so that the turbine box is easy to generate thermal stress under the condition of high-temperature alternating heat load, particularly the throat part is easy to generate thermal stress, the crack damage caused by the thermal stress is one of the most common failure modes of the turbine box, the reliability of the turbine box is influenced, and the service life of the supercharger is greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the inefficacy problem that leads to because of mechanical thermal stress height to the turbine case, especially to because turbine case operating temperature is high, and throat department is just in the high temperature region of fluid operation, because of the inhomogeneous thermal stress that produces of temperature distribution, causes the throat position to produce the crackle easily to influence the turbine case structure of the reduction thermal stress of the reliability of booster. The turbine box structure can avoid the problem of throat crack failure caused by thermal stress concentration, and improve the complete machine reliability of the turbocharger.

In order to realize the utility model discloses female, the utility model discloses the technical scheme who adopts is:

the utility model provides a reduce turbine case structure of thermal stress, includes turbine case shell, turbine case air inlet flange, engine exhaust gas inlet, throat, axle sleeve hole, exhaust gas outlet, bearing body connecting end, runner, its characterized in that, throat department adopts the chisel vacuole configuration form.

In a preferred embodiment of the present invention, the upper half or the lower half or all of the throat is in a form of a hollowed structure.

The utility model discloses a reduce turbine case structure of thermal stress, its throat is closed a mouthful department and is taken the new-type structure of chisel sky, based on conventional turbine case structure, only carries out optimal design to turbine case throat position. Adopt finite element analysis method, right the utility model relates to a turbine case and conventional turbine case of throat new construction form carry out the analysis contrast of mechanical thermal stress, the utility model discloses the turbine case throat new construction that adopts all has better performance at mechanical thermal stress's numerical value and centralized position.

Compared with the prior art, the utility model, following beneficial effect has:

1. the thermal stress concentration caused by working conditions such as temperature load and the like is reduced;

2. the failure risks of throat cracks and extension cracks of the turbine box caused by thermal stress are reduced, and the fatigue resistance of the turbine box is improved;

3. the reliability of the whole supercharger is improved.

Description of the drawings:

FIG. 1 is a schematic sectional view of a throat structure of a conventional turbine box.

Fig. 2 is a sectional view of a turbine case structure for reducing thermal stress according to embodiment 1 of the present invention.

Fig. 3 is a sectional view of a turbine case structure for reducing thermal stress according to embodiment 2 of the present invention.

Fig. 4 is a structural sectional view of a turbine case for reducing thermal stress according to embodiment 3 of the present invention.

The specific implementation mode is as follows:

the invention will be further explained with reference to the drawings and the description of the embodiments.

Fig. 1 is a sectional view of a conventional turbine case. Wherein 11 in fig. 1 shows the throat structure of the prior worm gear case.

Example 1

Referring to fig. 2, the turbine box structure for reducing thermal stress shown in the figure comprises a turbine box shell 1, a turbine box air inlet flange 2, an engine exhaust gas inlet 3, a throat 4, a shaft sleeve hole 5, an exhaust gas outlet 6, a bearing body connecting end 7, a flow channel 8 and the like. The throat 4 is in a form of a hollow structure.

When the supercharger works, engine exhaust gas enters the flow channel 8 through the engine exhaust gas inlet 3, the turbine rotor assembled in the turbine box is driven to rotate by exhaust gas energy, high-temperature exhaust gas enters the inner cavity of the turbine box through the flow channel 8, the turbine box is easy to generate thermal stress under various working conditions of cold and heat alternation and the like, and the stress position and the maximum value are concentrated at the position due to the characteristics of the throat 4 structure.

Example 2

Referring to fig. 3, a turbine box configuration for reducing thermal stresses is shown in which the upper portion 9 of the throat 4 is in the form of a gouge configuration. The rest of the structure of this embodiment is the same as embodiment 1.

Example 3

Referring to fig. 4, the thermal stress reduction turbine box structure is shown with the lower half 10 of the throat 4 in the form of a gouge. The rest of the structure of this embodiment is the same as embodiment 1.

Claims (1)

1. The utility model provides a reduce turbine case structure of thermal stress, includes turbine case shell, turbine case air inlet flange, engine exhaust gas air inlet, throat, axle sleeve hole, exhaust outlet, bearing body connecting end, runner, its characterized in that, the first half or the latter half or all adoption chisel vacuole structure form of throat department.

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