JPH07208189A - Supercharger cooling device of engine - Google Patents

Abstract

PURPOSE:To realize a practical operation without a fear of reducing the creep strength and the fatigue strength of an aluminum casting runner of the compressor of a supercharger, and without generating a thermal deformation of a bearing and its seal, under the condition of a high rotation and a high load of the engine, or under the condition that the outlet pressure of the compressor is high. CONSTITUTION:The downstream side of an intercooler 5 provided to a suction pipe 4 connecting from the compressor 3 of a supercharger 1 to the intake manifold of an engine; and a ring form pocket 13 provided to the periphery of the compressor 3 and a bearing between an exhaust turbine 2 and the compressor 3; are connected by a cooling air piping 8, and an electromagnetic valve 9 is provided to the cooling air piping 8. A controller 10 to control to open and close the electromagnetic valve 9 according to the operating condition of the supercharger 1 is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine supercharger cooling device.

[0002]

2. Description of the Related Art As is well known, an engine supercharger comprises an exhaust turbine and a compressor rotated by the exhaust turbine.

[0003]

When the impeller of the compressor is made of aluminum casting and is operated at a high rotation speed and a high pressure ratio, the outer peripheral portion of the impeller becomes high temperature and the creep strength and fatigue strength of the material are reduced. However, there was a risk that practical operation would be difficult. Further, there is a problem that lubricating oil and exhaust gas leak due to thermal deformation of the turbine side bearing seal portion.

An object of the present invention is to provide an engine supercharger cooling device that solves the above problems.

[0005]

SUMMARY OF THE INVENTION An object of the present invention to achieve the above object is to provide an engine supercharger comprising an exhaust turbine and a compressor rotated by the exhaust turbine, the intake of the engine from the compressor. The downstream side of the intercooler provided in the intake system passage connected to the manifold and the compressor are connected by a cooling air pipe, and an electromagnetic valve is provided in this cooling air pipe passage, and this electromagnetic valve is provided according to the operating conditions of the supercharger. It is equipped with a controller that controls opening and closing.

In an engine supercharger comprising an exhaust turbine and a compressor rotated by the exhaust turbine, the compressor is provided with a downstream side of an intercooler provided in an intake system passage connected from the compressor to an intake manifold of the engine. In addition to connecting by cooling air piping, an annular pocket is provided on the outer circumference of the bearing of the exhaust turbine and the compressor, the pocket and the cooling air piping are connected, and a solenoid valve is provided in the cooling air piping path. It is provided with a controller that controls opening and closing of the valve according to the operating conditions of the supercharger.

[0007]

With the above structure, in a situation where the supercharger is operated at a high rotation speed and a high pressure ratio, the solenoid valve is opened and a part of the intake air cooled by the intercooler is transferred to the compressor and the bearing portion by the cooling air pipe. Supply and forcibly cool the bearing and impeller.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a supercharger, which is composed of an exhaust turbine 2 having an impeller 2 a and a compressor 3 having an impeller 3 a rotated by the exhaust turbine 2.

The exhaust turbine 2 is connected to an exhaust manifold (not shown) by an exhaust pipe 6, and the compressor 3 is connected to an intake manifold (not shown) by an intake pipe 4.

An intercooler 5 for cooling the intake air whose temperature has been raised by the compressor 2 is arranged in the middle of the intake pipe 4.

According to the present invention, a slit 7 is provided at a position corresponding to the downstream side of the intercooler 5 and the outer peripheral portion of the impeller 3a of the compressor 3, and cooling air is provided between the downstream side of the intercooler 5 and the slit 7. Connected by pipe 8,
An electromagnetic valve 9 is provided in the middle of the cooling air pipe 8 and a controller 10 is provided for controlling the opening / closing of the electromagnetic valve 9 according to the operating condition of the supercharger 1.

In addition to the above structure, an annular pocket 13 is provided on the outer circumference of the bearing 11 for the impeller 2a of the exhaust turbine 2 and the impeller 3a of the compressor 3, and the pocket 13 and the cooling air pipe 8 are provided. Is connected.

The operating condition of the supercharger 1 in which the solenoid valve 9 is controlled to be opened and closed by the controller 10 is the rotation of the engine,
The load or the outlet pressure of the compressor 3 is input to the controller 10, and the opening of the solenoid valve 9 is controlled at the time of high engine rotation, high load or when the outlet pressure of the compressor 3 is high.

Since the present invention has the above-described structure, the solenoid valve 9 is closed in a region where the engine rotation, load or outlet pressure of the compressor 3 does not affect the impeller 3a of the compressor 3.

However, the opening of the solenoid valve 9 is controlled at the time of high engine speed, high load, or high outlet pressure of the compressor 3, which affects the impeller 3a of the compressor 3, and a part of the intake air cooled by the intercooler 5 is controlled. Is cooling air piping 8
And is supplied to the compressor 3 through the slit 7 to forcibly cool the impeller 3a of the compressor 3 and suppress the temperature rise of the outer peripheral portion of the impeller 3a of the compressor 3.

Further, in a structure in which an annular pocket 13 is provided on the outer circumference of the bearing 11 of the impeller 2a of the exhaust turbine 2 and the impeller 3a of the compressor 3, and the pocket 13 and the cooling air pipe 8 are connected to each other, The bearing 11 and its seal portion 12 are forcibly cooled, and in addition, the temperature rise of the outer peripheral portion of the impeller 3a of the compressor 3 is suppressed.

As a result, the creep strength of the impeller 3a of the compressor 3 made of aluminum is improved when the engine is rotating at high speed, the load is high, or the outlet pressure of the compressor 3 is high.
It is possible to operate without the fear of lowering the fatigue strength and without causing thermal deformation of the bearing 11 and its seal portion 12.

[0018]

As described above, according to the present invention, the downstream side of the intercooler provided in the intake system passage connected from the compressor of the supercharger to the intake manifold of the engine and the compressor are connected by the cooling air pipe, An electromagnetic valve is provided in the cooling air pipe line, and a controller that controls the opening / closing of this electromagnetic valve according to the operating conditions of the supercharger is provided, so at high engine speed, high load, or high compressor outlet pressure. At this time, it is possible to prevent the creep strength and fatigue strength of the aluminum cast impeller of the compressor from decreasing, and in the above configuration, an annular pocket is provided on the outer circumference of the bearing between the exhaust turbine and the compressor. A controller that connects to the air piping, installs a solenoid valve in this cooling air piping path, and controls the opening / closing of this solenoid valve according to the operating conditions of the turbocharger. In the configuration including La, it has the effect of enabling practical operation without causing thermal deformation of the bearing and its sealing section in addition to the above effects.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a device of the present invention

[Explanation of symbols]

 1 Supercharger 2 Exhaust Turbine 2a Exhaust Turbine Impeller 3 Compressor 3a Compressor Impeller 4 Intake Pipe 5 Intake Cooler 6 Exhaust Pipe 5 Exhaust Passage 6 Intercooler 7 Slit 8 Cooling Air Piping 9 Electromagnetic Valve Path 10 Controller 11 Bearing 12 Sealing Part 13 pockets

Claims (2)

[Claims] 1. A turbocharger for an engine, which comprises an exhaust turbine and a compressor rotated by the exhaust turbine, wherein a downstream side of an intercooler provided in an intake system passage connected from the compressor to an intake manifold of the engine and the compressor. Is connected by a cooling air pipe, an electromagnetic valve is provided in the cooling air pipe line, and a controller for controlling the opening / closing of the electromagnetic valve according to the operating conditions of the supercharger is provided with an engine supercharger. Cooling system. 2. A turbocharger for an engine, which comprises an exhaust turbine and a compressor rotated by the exhaust turbine, and a downstream side of an intercooler provided in an intake system passage connected from the compressor to an intake manifold of the engine and the compressor. While connecting with a cooling air pipe, an annular pocket is provided on the outer circumference of the bearing of the exhaust turbine and the compressor, the pocket and the cooling air pipe are connected, and a solenoid valve is provided in the cooling air pipe passage. A supercharger cooling device for an engine, comprising a controller for controlling opening / closing of the solenoid valve according to operating conditions of the supercharger.