KR20010055346A - A blaze preventing apparatus of a turbo-charger - Google Patents

Abstract

PURPOSE: An aging preventing device of a turbo-charger is provided to prevent a turbo-charger from aging by keeping the flow of sufficient cooling oil in the turbo-charger even in the hot shut down of an engine. CONSTITUTION: In the hot shut down of an engine, oil is not supplied to an oil feed pipe from an oil pump any longer. The oil in an oil tank is supplied to a turbo-charger(12) through another oil feed pipe(32). Some heat of the turbo-charger is absorbed by the oil remaining in a U-shaped portion(56) of an oil return pipe(34). When oil pressure is not applied to a piston any more, a compressed first spring is restored to push the piston. A second port is opened, and a second elongated spring is restored. An oil vessel slides toward a cylinder, and the oil therein flows into the cylinder through the second port. The oil in the cylinder is supplied to the oil feed pipe(32) via a through hole of the piston. Oil is supplied into the turbo-charger even in the hot shut down of the engine so that various devices in the turbo-charger are prevented from aging.

Description

Turbocharger deterioration prevention device {A BLAZE PREVENTING APPARATUS OF A TURBO-CHARGER}

The present invention relates to an apparatus for preventing deterioration of a turbocharger, and more particularly, a turbo capable of preventing deterioration of a turbocharger by maintaining a sufficient flow of cooling oil in the turbocharger when the engine is temporarily turned off. It relates to a device for preventing deterioration of the charger.

As is well known, a turbocharger is used to turn an exhaust turbine using energy of exhaust gas discharged after combustion in a combustion chamber in an engine, and compresses air with a compressor directly connected thereto, and then supplies compressed air to the combustion chamber. By this means a device for improving the output of the engine.

As shown in FIG. 5, such a turbocharger is provided with turbines 104 and impellers 106 having different angles at both ends of one shaft 102 to connect the turbine-side housing 108 to the intake manifold. The impeller side housing 110 connects to the exhaust manifold. When the turbine 104 on the exhaust side is rotated while the exhaust gas is discharged from the exhaust stroke of the engine, the intake impeller 106 also rotates, so that the air near the center of the impeller 106 is accelerated to the outside under centrifugal force and diffuser 112. In the diffuser 112, air is compressed and supplied to the intake manifold.

On the other hand, a bearing portion 114 for supporting the shaft 102 is formed at the center of the shaft 102 connecting the turbine 104 and the impeller 106, and cooled outside the bearing portion 114. A center housing 116 is formed with an oil hole 118 for the distribution of the oil.

The turbocharger made as described above is configured to supply the charge air using the exhaust energy to the engine, so that the bearing part 114, which is a rotating member, receives a lot of heat load. Therefore, as a device for preventing the deterioration of the turbocharger as described above, the oil supply pipe 120 is installed in the upper portion of the center housing 116 in the oil hole 118 side to supply oil from the oil pump when the engine is driven. As a result, the superheated bearing unit 114 is cooled, and the supplied oil is recovered through the oil return pipe 122 installed under the center housing 116.

Here, the oil supply pipe 120 and the oil return pipe 122 were formed in a pipe shape that can simply distribute oil as a general pipe structure.

However, when the turbocharger is prevented from being deteriorated by using the oil supply pipe and the oil return pipe having the simple structure as described above, the turbocharger can be sufficiently cooled in a normal driving state, but the engine is momentarily stopped ( Hot Shut Down), the oil pump is also stopped, so supply of oil is stopped and hot exhaust heat is transferred to the bearing in the center housing. This high heat conduction heat deteriorates a small amount of oil remaining in the center housing, which causes the adhesion of the shaft and the bearing, causing a serious damage to the turbocharger.

As a means to prevent this, a compressed natural gas (CNG) engine or the like may use a turbocharger that cools as water, but for this purpose, a separate device for water supply must be added to the engine, resulting in complicated and expensive engine devices. There is a problem.

Therefore, the present invention is to solve the above problems, an object of the present invention is to maintain a sufficient flow of cooling oil in the turbocharger even if the engine is turned off momentarily turbocharger that can prevent the turbocharger from deteriorating It is to provide my deterioration prevention device.

1 is a cross-sectional view of a turbocharger to which the deterioration preventing apparatus according to the present invention is applied;

2 is a cross-sectional view of part A of FIG.

3 is an operation diagram during normal operation of the engine of the deterioration preventing apparatus according to the present invention;

4 is an operation diagram when the engine momentary stop of the deterioration preventing apparatus according to the present invention;

5 is a cross-sectional view of a turbocharger according to the prior art.

<Explanation of symbols for the main parts of the drawings>

12: turbocharger 14: shaft

16: turbine 18: impeller

20 turbine housing 22 impeller housing

24: diffuser 26: bearing

28: oil hole 30: center housing

32: oil supply pipe 34: oil return pipe

36: cylinder 38,40: 1st, 2nd port

42: first spring 44: piston

46 through hole 48 check valve

50: second spring 52: oil storage container

54: U-shaped

In order to achieve the above object, the present invention,

In a turbocharger having an oil supply pipe for supplying oil to an oil hole formed in the center housing outside the bearing portion of the turbocharger and an oil return pipe for recovering the cooled oil, the oil supply pipe has a predetermined amount of oil at one side thereof. It provides an apparatus for preventing deterioration of a turbocharger comprising an oil storage means capable of storing as much as possible.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention that can specifically realize the above object will be described.

1 to 4 show a preferred embodiment of the present invention, in which reference numeral 12 of FIG. 1 denotes the entire turbocharger.

The turbocharger 12 is an apparatus for improving the output of the engine by supplying compressed air to the combustion chamber by using the energy of the exhaust gas discharged from the combustion chamber, as described above. Another turbine 16 and an impeller 18 are installed to connect the turbine side housing 20 to the intake manifold, and the impeller side housing 22 to the exhaust manifold, between the impeller side housing 22 and the exhaust manifold. A diffuser 24 is formed therein, while a bearing portion 26 for supporting it is formed at the center of the shaft 14, and an oil hole for distributing cooling oil outside the bearing portion 26. A center housing 30 with a 28 is formed.

As a device for supplying oil into the turbocharger and recovering oil as described above, an oil supply pipe 32 is installed on the oil hole 28 side of the center housing 30, and the center housing 30 An oil return pipe 34 is installed at the lower portion.

In the oil supply and recovery apparatus made as described above, the present invention adds an oil storage means (A) capable of storing a certain amount of oil to one side of the oil supply pipe so that the oil storage means (even if the engine is temporarily turned off) Temporarily supplying oil into the turbocharger in A) ensures that sufficient cooling oil flow is maintained in the turbocharger for a period of time.

The oil storage means (A) may store a predetermined amount of oil supplied into the turbocharger through the oil supply pipe during the normal operation of the engine, and may supply the stored oil into the turbocharger at the moment of stopping the engine. Made of structure.

As an example of the oil storage means, as shown in FIG. 2, the present invention penetrates the tubular cylinder 36 and the cylinder 36 formed to protrude toward one side of the oil supply pipe 32. And the first and second ports 38 and 40 forming the inlet and the outlet of the oil, and the inner wall of the cylinder 36 are supported by the first spring 42 to slide the inside of the cylinder 36 so as to slide the first and second ports. The check valve is formed in the piston 44 for selectively opening and closing the two ports (38, 40), and the through-hole 46 in the piston 44 to operate so that oil can penetrate the piston 44 in only one direction (48) and an oil storage container which is supported by the second spring 50 on the outer wall of the cylinder 36 and slides along the outer wall of the cylinder 36 to store a predetermined amount of oil flowing through the first port 38 ( 52) an oil storage means is provided.

The cylinder 36 is formed in a tubular shape, one side is closed and the first spring 42 and the second spring 50 are installed inwards and outwards, and the side wall of the cylinder 36 is in order from the oil supply pipe 32. As described above, the first port 38 and the second port 40 pass through the side wall.

The restoring force of the first spring 42 is formed to be less than the restoring force of the second spring 50, and the first port 38 is formed from the oil storage container 52 from the oil supply pipe 32 during the engine normal operation. As the inlet for supplying the oil to the furnace, the second port 40 serves as an outlet for supplying the oil stored from the oil storage container 52 to the oil supply pipe 32 when the engine momentary stops.

The piston 44 is supported by the first spring 42 to elastically move along the inner wall of the cylinder 36, and has a through hole 46 formed in the longitudinal direction oil stored in the oil storage container 52 This can be discharged through the through hole 46.

At this time, a check valve 48 is installed in the through hole 46 to prevent backflow when oil is leaked.

The oil storage container 52 is mounted to the outside of the cylinder 36 as a cylindrical shape, one side is opened and one side is closed, and has a volume sufficient to store an amount of oil required for cooling the turbocharger at the moment of stopping the engine. It is equipped with, and is supported on the cylinder 36 by the second spring (50).

Here, when the oil storage container 52 slides in the oil storage direction, the sliding distance is limited by the tension limit of the second spring 50.

In addition, it is preferable that a sealing 54 is provided between the cylinder 36 at the opening side end of the oil storage container so that oil flowing from the cylinder 36 does not leak to the outside.

Meanwhile, in order to allow the oil to stay in the center housing for a longer time with the oil storage means configured as described above, referring to FIG. 1 again, the U-shaped portion 56 is formed on one side of the oil return pipe 34. By allowing the oil to stay in the U-shape in a certain amount, the oil can absorb some of the conductive heat in the turbocharger, thereby reducing the cooling time of the turbocharger during momentary shutdown of the engine.

Looking at the operation of the turbocharger deterioration preventing device according to the present invention made as described above are as follows.

First, since the oil pump also operates normally during normal operation of the engine, oil is supplied to the oil hole 28 in the turbocharger 12 through the oil supply pipe 32 to cool the bearing portion 26.

At this time, as shown in FIG. 3, a part of the oil passing through the oil supply pipe 32 is stored by the oil storage means. That is, by the hydraulic pressure in the oil supply pipe 32, the piston 44 slides the inside of the cylinder 36 while compressing the first spring 42 to open the first port 38. The oil supply pipe 32 Some of the oil in the inlet flows into the oil storage container 52 through the first port 38 and pushes the oil storage container 52, and the oil storage container 52 of the second spring 50 A certain amount of oil is stored while sliding along the outer wall of the cylinder 36 to the tensile limit.

On the other hand, when the engine is turned off momentarily, the operation of the oil pump is also stopped, so that no more oil is supplied from the oil pump to the oil supply pipe.

At this time, as shown in FIG. 4, the oil stored in the oil storage means is supplied to the turbocharger 12 through the oil supply pipe 32, and also remains in the U-shaped portion 54 of the oil return pipe 34. The oil absorbs part of the conductive heat of the turbocharger.

Looking at the operation in which the oil is supplied to the oil supply pipe 32 by the oil storage means in the above, if the hydraulic pressure acting on the piston 44 disappears, the compressed first spring 42 is restored to push the piston 44 The second port 40 is opened, the tensioned second spring 50 is restored and the oil storage container 52 slides to the cylinder 36 side, and the oil in the oil storage container 52 is opened. The oil is introduced into the cylinder 36 through the two ports 40, and the oil in the cylinder 36 passes through the through hole 46 of the piston 44 and flows into the oil supply pipe 32.

Due to the temporary oil supply by the oil storage means and absorption of the conductive heat of the U-shaped portion of the oil return pipe as described above, the oil is supplied to the turbocharger for a predetermined time even when the engine is stopped, and the conductive heat is dispersed. It is possible to prevent deterioration of various devices.

The turbocharger deterioration preventing device according to the present invention as described above maintains the flow of cooling oil in the turbocharger for a certain time even in the momentary stop state of the engine to prevent seizure of the shaft portion in the turbocharger turbocharger It can improve its durability and ensure safer operation.

In addition, since it is possible to cool only by configuring the oil pipe without adding a separate water cooling device, there is no need to form a separate water cooling furnace in the turbocharger.

Claims (4)

A turbocharger comprising an oil supply pipe for supplying oil to an oil hole formed in a center housing outside the bearing portion of the turbocharger and an oil return pipe for recovering the finished oil. The oil supply pipe An apparatus for preventing deterioration of a turbocharger, comprising oil storage means capable of storing a predetermined amount of oil on one side thereof. The method according to claim 1, The oil storage means A tubular cylinder formed to protrude toward one side of the oil supply pipe; First and second ports penetrating the side of the cylinder to form an oil inlet and an outlet; A piston which is supported by the first spring on the inner wall of the cylinder and slides inside the cylinder to selectively open and close the first and second ports; A check valve formed in the through hole in the piston and operable to allow oil to penetrate the piston only in one direction; And an oil storage container which is supported by the second spring on the outer wall of the cylinder and slides along the outer wall of the cylinder to store a predetermined amount of oil flowing through the first port. The method according to claim 2, The oil storage means Sealing to prevent the leakage of the oil stored interposed between the cylinder and the oil storage container; apparatus for preventing deterioration of the turbocharger further comprises. The method according to claim 1, One side of the oil return pipe The deterioration preventing device of the turbocharger, characterized in that the oil discharged to the lower portion of the center housing in the form of a U-pipe that can be maintained by a certain amount.