KR0139717Y1 - Intercooler of a diesel engine - Google Patents

Abstract

By installing a bypass line in the air circulation line of the intermediate cooler to selectively control the air flow path during cold start of the engine or during normal operation of the engine, it not only improves the cold startability of the engine, In order to shorten the warm-up time to prevent unnecessary fuel consumption, and to reduce the amount of harmful gas emitted by the warm-up operation in the cold state, the air introduced through the air duct and the air cleaner is Pressurization is accelerated by the speed reducer, and the temperature of the air that is increased by the acceleration of the pressurization of the air is cooled so that a large amount of air is taken in through the intake manifold to the combustion chamber of the engine under high density, and the combustion gas is discharged at an appropriate temperature. To prevent the temperature rise of the impeller and the impeller of the supercharger In the intermediate cooler of a diesel engine, the blower case and the intercooler forming the supercharger to be intake into the combustion chamber of the engine via the intercooler of the intermediate cooler is formed so as to communicate with the intercooler and the combustion chamber. A bypass line is provided for selectively intercepting air flow paths by an intermittent means between an air inlet hose and an air outlet hose for communicating each intake port.

Description

Medium cooler of diesel engine

1 is a perspective view showing a diesel engine to which an intermediate cooler according to the present invention is applied.

2 is a schematic cross-sectional view of a diesel engine to which an intermediate cooler according to the present invention is applied.

3 is a partial perspective view showing a first embodiment of the bypass line control means according to the present invention.

4 is a partial cross-sectional view showing a first embodiment of the bypass line control means according to the present invention.

5 is a partial cross-sectional view showing a second embodiment of the bypass line control means according to the present invention.

6 is a perspective view of a diesel engine to which a conventional intermediate cooler is applied.

7 is a schematic cross-sectional view of a diesel engine to which a conventional intermediate cooler is applied.

* Explanation of symbols for main parts of the drawings

2: bypass line 4: rotating shaft

6: Bypass Valve 8: Bracket

10 connection member 12 piston rod

14: water temperature sensor 16: ECU

20: pneumatic cylinder 22: bracket

23: elastic member 24: servo motor

58: intake port 62: blower

64: air duct 66: air purifier

70: intercooler 72: air inlet hose

74: air outlet hose 76: combustion chamber

[Industrial use]

The present invention relates to an intermediate cooler of a diesel engine, and more particularly, to an intermediate cooler of a diesel engine that not only enables easy starting, but also shortens the warm-up time of the engine.

[Private Technology]

In general, a diesel engine sucks only air into a combustion chamber of a piston which is installed in a cylinder block so as to reciprocate up and down, and compresses it so that when the temperature of the air is increased, the fuel is injected at high pressure so that the fuel is ignited and combusted by the heat of compressed air Doing.

In the cylinder block, a cylinder head provided with an intake and exhaust valve is formed to be coupled to the intake of air supplied to the combustion chamber of the piston through the intake and exhaust ports formed in the cylinder head, or the combustion gas combusted in the combustion chamber. It is possible to control the intake and exhaust.

On the other hand, the fuel supplied to the combustion chamber as described above is injected into the high temperature and high pressure air sucked into the combustion chamber by the fuel injection device, the fuel device performs an important function of controlling the torque of the engine by controlling the injection amount of the fuel It consists of a fuel tank for storing fuel, a fuel filter, an injection pump, an injection nozzle, and lines and hoses connecting them.

In addition, the fuel is charged to the combustion chamber so as to increase the output of the engine together with the fuel injected and controlled by the fuel apparatus as described above. Combustion gas having a to rotate the turbine of the supercharger, and by rotating the impeller of the compressor coaxially coupled with the turbine shaft by the rotational force of the turbine is forced to supply a large amount of air to the combustion chamber in accordance with the rotation of the impeller.

On the other hand, the diesel engine employing such a supercharger, as compared with the diesel engine without the supercharger, as a large amount of air is compressed in the combustion chamber of the same optimum, the compression temperature of the air is further increased, and thus the temperature of the exhaust gas higher is, the increase of finally turbine bearings, component damage concerns of the turbocharger, and a large amount of nitrogen oxides (NO _X) wherein the exhaust gas, as they result in the discharge is then by the intercooler with its exhaust temperature cooling is supplied to the supercharger I am trying to.

The supercharger and the intermediate cooler as described above are provided with a turbine case 52 communicating with it in the exhaust manifold 50 of the engine as shown in FIG. 6 and FIG. The turbine 54 through which the exhaust gas of the manifold 50 passes is embedded.

The rotary shaft 56 of the turbine 54 is mounted to the bearing so that it can be rotated smoothly from the turbine case 52 so that the turbine 54 can be rotated by the exhaust gas that hits the plurality of bleeds at high temperature and high pressure. To make it possible.

In addition, the blower case 60 communicating with the intake manifold 58 is isolated on one side of the turbine case 52 in an isolated state, and the blower case 60 and the turbine case 52 are rotated around the turbine. 56 penetrates in a rotatable state.

As described above, a blower 62 having a plurality of bleeds is fixedly mounted to the rotary shaft 56 of the turbine 54 penetrated through the turbine case 52 and the blower case 60 to cause the blower 62 to be fixed. It is rotated by the rotational force of the turbine 54 transmitted through the rotary shaft 56 to accelerate and pressurize the air flowing into the intake manifold 58 through the air duct 64.

On the other hand, the air pressurized and accelerated by such a supercharger becomes a high temperature according to the pressure, and nitrogen oxide increases discharge | emission, and raises the temperature of exhaust gas, and the turbine 54 and the turbine 54 inlet part of a turbocharger are raised. Since the thermal load is increased by increasing the temperature, the intermediate cooler as described above is installed in the air distribution path of the supercharger connected to the intake manifold 58 so as to cool the air whose temperature is increased according to the pressure. Doing.

As described above, the intermediate cooler communicates with the blower case 60 of the supercharger so that the air, which is introduced through the air duct 64 and the air cleaner 66, and then pressurized and accelerated by the blower 62, can flow. The hose 68 is provided.

The air hose 68 is connected to the intake passage 72 to an intercooler 70 that cools the air so as to decompress and decelerate the air, and the intercooler 70 is connected to the intake passage 74. It is connected to the fold 58 so that the decompressed and decelerated air can be supplied to the combustion chamber 76 of the engine via the intercooler 70.

In this way, a large amount of air, which has been reduced in pressure and decelerated, and has increased in density, is provided to the combustion chamber 76, whereby more air is taken into the combustion chamber 76, thereby improving the output of the nitrogen oxide while improving the engine output. In addition, the temperature of the exhaust gas can be lowered and the thermal load of each component of the supercharger can be reduced.

However, as described above, the intermediate cooler of the conventional diesel engine has difficulty in starting the engine requiring air at a constant temperature because the air is sucked into the combustion chamber of the engine under reduced pressure and deceleration even during the cold start of the engine. Even if the engine is started, it requires a long warm-up time for the engine to reach a normal operating point, which leads to unnecessary fuel consumption and a large amount of harmful gas discharged due to cold start.

Summary of the proposal

The present invention was devised to solve the above-mentioned disadvantages, and an object of the present invention is to provide a bypass line in an air distribution line of an intermediate cooler to selectively start the engine during cold start or normal operation of the engine. It is to provide an intermediate cooler of a diesel engine to selectively regulate the air flow path to improve the cold startability of the engine.

In addition, the intermediate cooler of the diesel engine according to the present invention can shorten the warm-up time of the engine, thereby preventing unnecessary fuel consumption, and reducing the amount of harmful gas emitted by the warm-up operation of the cold state. There is another purpose.

The intermittent means is built in a state capable of turning on one side of the bypass line to open or close the air flow path of the bypass line, or to close or open the intake port of the intake manifold communicating with the combustion chamber. A pass valve; The piston rod is connected to the bracket which protrudes outward from the bypass line in a state in which the piston rod extends perpendicularly to the rotation shaft of the bypass valve, and is connected to the bracket by the ECU according to the coolant temperature of the engine detected by the water temperature sensor. A pneumatic cylinder which pivots the bypass valve by controlled operation; Including an elastic member that is fixed to both ends of the bracket of the bypass valve is fixed to the opposite position of the pneumatic cylinder is fixed to return the bracket of the bypass valve pivoted by the pneumatic cylinder; Characterized in that made.

In another embodiment, the intervening means is a bypass valve which is in a state capable of turning on one side of the bypass line to open or close the bypass line, or close or open the intake port of the intake manifold communicating with the combustion chamber. Wow; By operating the rotary shaft of the bypass valve, a part of which protrudes outwardly of the bypass line under the control of the ECU according to the coolant temperature of the engine detected by the water temperature sensor, causes the bypass valve to air It is characterized in that it is made to include a servo motor to selectively interrupt the flow path.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, and the same reference numerals will be given to the same parts as in the prior art.

EXAMPLE

The intermediate cooler of the diesel engine according to the present invention is introduced into a clean state through the air duct 64 and the air cleaner 66 as shown in FIG. 1 and FIG. 2 and then pressurized by the blower 62 forming the supercharger. An air inlet hose 72 and an air outlet hose 74 are provided to provide a flow path so that the accelerated air can be taken into the combustion chamber 76.

An intercooler 70 is installed between the air inlet hose 72 and the air outlet hose 74 to cool the air from the air duct 64, which is pressurized and accelerated by the supercharger, to obtain an intake port under a high density. Through 58), the combustion chamber 76 can be aspirated in large quantities.

On the other hand, between the air inlet hose 72 and the air outlet hose 74, the air inlet hose 72 and the air outlet hose 74 is in direct communication so that the air flow path is selectively controlled by the intermittent means. The bypass line 2 is provided so that air having a suitable temperature may be taken into the combustion chamber 76 of the engine during cold start of the engine or during normal operation of the engine.

The intermittent means as described above is provided with a bypass valve 6 on the one side of the bypass line 2 as shown in FIGS. 3 and 4 so that the rotary shaft 4 is pivotable. To allow the bypass valve 6 to open or close the air flow path of the bypass line 2, or to close or open the air inlet passage of the air inlet hose 72 communicating with the intercooler 70. Doing.

The rotary shaft 4 of the bypass valve 6 has a bracket 8 formed so that its upper end partially protrudes outward of the bypass line 2 and is orthogonal to its center axis line.

One side of the bracket 8 is connected to the piston rod 12 by a connecting member 10 in a state capable of being hinged, by the ECU 16 according to the coolant temperature of the engine detected by the water temperature sensor 14. The valve 18 is operated to control and install a pneumatic cylinder 20 for turning the bypass valve 6.

The operation of the pneumatic cylinder 20 is such that the bracket 8 is pivoted about the rotational axis 4 of the bypass valve 6 so that the bypass valve 6 on which the bracket 8 is fixed is rotated. It turns with (4), and it is possible to control the air flow path of the bypass line (2).

Bypass that is pivoted by the pneumatic cylinder 20 between the bracket 8 and another bracket 22 provided to be fixedly formed at the opposite position of the pneumatic cylinder 20. The bracket 8 of the valve 6 can be returned.

By way of example, as shown in FIG. 5, as shown in FIG. 5, as shown in FIG. 5, a bypass in which the rotary shaft 4 is in a state of being pivotable on one side of the bypass line 2 is provided. The valve 6 is provided so that the bypass valve 6 opens or closes the air flow path of the bypass line 2, or the air inlet hose 72 communicated with the intercooler 70. The air inlet passage is closed or opened.

On the other hand, the rotary shaft 4 of the bypass valve 6 has an upper end portion protruding to the outside of the bypass line (2) ECU according to the coolant temperature of the engine detected by the water temperature sensor 14 ( It is to be coaxially coupled with the rotation shaft 4 of the servomotor 24 provided to rotate operation under the control by 16).

On the other hand, since the supercharger as described above is configured in the same manner as in the prior art, detailed description thereof will be omitted.

As described above, the high temperature and high pressure combustion gas discharged through the exhaust manifold 50 of the engine rotates the turbine 54 so that the rotational force of the turbine 54 is transmitted to the blower 62 through the rotation shaft 56. By transmitting the air, the air flowing from the air duct 64 is accelerated and pressurized by the rotational force of the blower 62, thereby forcibly increasing the amount of the air drawn into the combustion chamber 76.

As such, the air from the air duct 64, which is pressurized and accelerated by the supercharger and forced to increase inflow into the combustion chamber 76, is placed under a state of maintaining an appropriate temperature according to the pressure, and the engine starts cold. In the combustion chamber 76 in a state of maintaining a proper temperature through the bypass line 2 in which the distribution path is selectively interrupted by an intermittent means in accordance with the engine operating state in the case of normal operation or normal operation, or Or, it is cooled through the intercooler 70 to be taken into the combustion chamber 76.

In the intermittent means, when the engine is cold started, the ECU 16 supplies electric signals to open the valve 18 of the pneumatic cylinder 20 according to the coolant temperature of the engine sensed by the water temperature sensor 14. Pneumatic pressure is applied to the cylinder 20.

Accordingly, the piston rod 12 of the pneumatic cylinder 20 pushes the end of the bracket 8 formed on the rotary shaft 4 of the bypass valve 6 hingedly connected to the connecting member 10, and thus the bracket 8 ) Rotates about its axis with its axis of rotation (4).

The rotary shaft 4 is configured such that the bypass valve 6 fixed thereto is pivoted to one side to open the bypass line 2 and close the air inlet hose 72 through the intercooler 70. In addition, the air flowing through the air duct 64 is pressurized and accelerated by the supercharger to be taken in through the bypass line 2 to the combustion chamber 76 of the engine without undergoing an intermediate cooling action under an appropriate temperature.

In addition, when the engine starts and performs a warm-up operation for a predetermined period, and then enters a normal operating state, the water temperature sensor 14 detects the ECU 16 according to the coolant temperature of the engine. Provides an electrical signal for closing 18 so that the pneumatic cylinder 20 is removed.

Therefore, the end of the bracket 8 formed on the rotary shaft 4 of the bypass valve 6 is pushed in the return direction by the elasticity of the elastic member 23 so that the rotary shaft 4 of the bypass valve 6 is bypass valve. Turn to the other side with (6).

The bypass valve 6 closes the bypass line 2 and opens the air inlet hose 72 through the intercooler 70, thereby allowing air to flow through the air duct 64. Is pressurized and accelerated by the supercharger so as to be taken into the combustion chamber 76 of the engine through the bypass line 2 without undergoing an intermediate cooling action under a suitable temperature.

[Effect of design]

The intermediate cooler of the diesel engine according to the present invention as described above is provided with a bypass line in the air distribution line of the intermediate cooler so that the air flow path is selectively interrupted during cold start of the engine or during normal operation of the engine. Not only improves the cold startability of the engine, but also shortens the engine's warm-up time, preventing unnecessary fuel consumption, and reduces the amount of harmful gas emissions associated with cold-warm-up operation. There is an advantage to this.

Claims (3)

The air introduced through the air duct 64 and the air cleaner 66 is pressurized and accelerated by the speed reducer, and the air temperature is increased by cooling the air. In the intermediate cooler of the diesel engine to allow a large amount of air intake into the combustion chamber 76 of the engine, and to ensure that the combustion gas is discharged at an appropriate temperature to prevent the temperature rise of the impeller and the impeller periphery of the supercharger. The blower 62 and the intercooler 70, and the intercooler 70, which constitute the supercharger, are configured to allow air introduced from the duct 64 to be taken into the combustion chamber 76 of the engine via the intercooler 70 of the intermediate cooler. A flow path of air by means of an intermittent means between the air inlet source 72 and the air outlet hose 74 which respectively communicate the intake port 58 formed to communicate with the combustion chamber 76. Inter-cooler for a diesel engine, characterized in that the ever install an optional by-pass line (2) which is interrupted by. 2. The intake air according to claim 1, wherein the control means is built in a state capable of turning on one side of the bypass line 2 to open or close the air flow path of the bypass line 2 or communicate with the combustion chamber 76. A bypass valve 6 for closing or opening the intake port 58 of the manifold; The piston rod 12 is connected to the bracket 10 which protrudes outward from the bypass line 2 in a state in which the piston rod 12 extends perpendicularly to the rotation shaft 4 of the bypass valve 6. A pneumatic cylinder 20 connected and formed to be controlled by the ECU 16 according to the coolant temperature of the engine sensed by the water temperature sensor 14, thereby turning the bypass valve 6; The bypass valve 6 pivoted by the pneumatic cylinder 20 is fixed at both ends of another bracket 22 fixedly formed at the opposite position of the bracket 8 and the pneumatic cylinder 20 of the bypass valve 6. And an elastic member (23) which emits elasticity to return the bracket (8) of the diesel engine. The intake port 58 of the intake manifold as claimed in claim 1, wherein the control means is provided in a state capable of turning on one side of the bypass line 2 to open and close the bypass line 2 or communicate with the combustion chamber 76. Bypass valve (6) for closing or opening); Under the control of the ECU 16 according to the coolant temperature of the engine sensed by the water temperature sensor 14, the rotary shaft 4 of the bypass valve 6 in which a part of the bypass valve 2 protrudes is formed. Pivoting operation, characterized in that the bypass valve (6) comprises a servomotor (24) for selectively interrupting the air flow path of the bypass line (2).