JPS60261932A - Water cooled turbo-supercharger - Google Patents

Abstract

PURPOSE:To prevent the temperature of bearings in a supercharger from increasing to a value at which the bearing seizes up and to prevent lubricating oil from deteriorating, by changing the circulating amount of cooling water in accordance with both temperature of the bearings and tendency of temperature variations thereof. CONSTITUTION:In a condition in which an engine 2 is operated, a temperature sensor 60 delivers always a detection signal indicating the temperature of a part in the vicinity of bearings to a controller 50. Meanwhile in the controller 50, a computer 50A for computing a temperature increasing rate per unit time ( deg.C/ sec) computes the temperature increasing rate of the part in the vicinity of the bearings. The temperature increasing rate and the detected temperature are compared with a critical temperature increasing rate and a critical temperature which are previously set. When they exceed the set values, the controller 50 feeds an valve opening signal to a control valve 20 and as well feeds a drive signal to a cooling water pump 30 so that cooling water in excess is fed directly to the supercharger from a radiator 7 through a supply pipe 40.

Description

[Detailed Description of the Invention] [Technical Field] Regarding the water-cooled turbocharger according to the present invention, in particular, water cooling in which cooling water flowing through a water jacket provided in the housing is cooled by two radiators [Prior art] ” In a general exhaust turbo supercharger, the bearing part of the rotating shaft is lubricated and cooled with lubricating oil, but it is also necessary to prevent the bearing housing in which the bearing part is installed from becoming hot. In order to -, which was published in this case report No. 7231/1983.Here, line 1 is the water-cooled exhaust turbocharger, 2 is the engine body, and the turbocharger. Lubricating oil is supplied to the bearing portion (not shown) of the feeder 10 from the engine 2 side via the lubricating oil supply pipe 3, and the lubricating oil that has lubricated and cooled the bearing portion is returned to the engine 2 side via the lubricating oil return pipe 4. returned and circulated.

5 is a cooling water supply pipe, 6 is a cooling water return pipe, and the cooling water radiated by the radiator 7 is once led to the engine 2 through the cooling water introduction pipe 8, and after cooling the engine 2, is passed through the supply pipe 5. It is guided to the feeder 1 to cool the bearing housing (not shown), and is then returned to the engine 2 via the return pipe 6, and then to the radiator 7 via the return pipe 9.
The heat is then dissipated. 10 is a reserve tank for replenishing the cooling system with cooling water, and 11 is a radiator cap to which a cooling water replenishment pipe from the reserve tank 10 is connected.

However, in such a conventional water-cooled turbocharger, a cooling water pump (not shown) that circulates cooling water is driven by the engine 2, so the amount of circulation corresponds to the rotational speed of the engine 2. increase or decrease.

Therefore, if the temperature of the bearing part (not shown) of the turbocharger 1 is abnormally high and the amount of circulating water is reduced, the rotation will be reduced due to insufficient cooling. There is a risk of seizure between the shaft and bearing. On the other hand, if the amount of circulating cooling water is large relative to the temperature of the bearing, and the bearing is overcooled, the oil film temperature will decrease and friction loss will increase.

〔the purpose〕

In view of these conventional problems, an object of the present invention is to provide a water-cooled turbo that changes the amount of circulating cooling water depending on both the temperature and temperature change tendency in the bearing of a supercharger. Our goal is to provide superchargers.

〔composition〕

In order to achieve this object, the present invention provides a cooling water supply pipe that directly leads the cooling water from the radiator to the supercharger, separate from the cooling water introduction pipe from the radiator to the engine.
For example, install a solenoid valve in this supply pipe. ,, Bubble,, □−□ months! f
ff*1IlfL, 1 Cooling pump is arranged in series, and furthermore, there is a temperature detection means for detecting the temperature near the bearing of the supercharger, and the temperature is increased based on the temperature detected by this temperature detection means. - has a calculator that calculates the rate, and drives the cooling water pump and opens the remote control valve only when both the calculated rate of temperature increase and the detected temperature meet predetermined conditions; If there is a risk that the bearing may become too hot, the control means supplies extra cooling water to the supercharger via an independent cooling water pump.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 2 shows an embodiment of the present invention, where 20 is a remote control valve that can be opened and closed, such as a solenoid valve, and 30 is a cooling water pump that is specially operated for several seconds. Operation valve 2
0 and cooling water pump 30 from 2 radiator 7 to supercharger 1
A supply pipe 40 that can directly supply cooling water to. The control valve 20 is opened and closed and the cooling water pump 30 is started and stopped via the controller 50.

60 is a temperature detection sensor attached to the supercharger 1, and as shown in FIG.
The temperature related to the bearing 103 is detected and a signal thereof is supplied to the controller 950.

Further, in FIG. 2, for example, a rotational speed detection sensor is used to detect the 20 rotations of the enlarging engine 70, and the speed signal detected by the sensor 70 is also supplied to the controller 50.
(It is also possible to detect this sensor 70 when the engine 2 is stopped in winter and temporarily drive the cooling water pump 30 to continue cooling during that time.) In FIG. 3, 104 is an exhaust turbine, xo
sm compressor, and 106 is a common rotating shaft of the exhaust turbine 104 and the compressor 105.

The operation of supplying cooling water to the supercharger 1 in the water-cooled turbocharger configured as described above will be described with reference to FIG. A detection signal of the temperature of the unit is supplied to the controller 50.

On the other hand, the controller 50 determines the temperature increase rate t:/ based on the temperature detection signal sent from the sensor 60.
Since a computing unit 50A for computing sea is provided, the temperature increase rate around the bearing is computed by this computing unit 50A.

The temperature increase rate and detected temperature are compared with the preset limit rate of increase and temperature limit, and when the temperature rise rate and the detected temperature exceed the set conditions, the controller 50 supplies a valve opening signal to the operation valve 20 and A drive signal is supplied to the cooling water pump 30 so that extra cooling water is sent directly from the second radiator 7 to the supercharger 1 via the supply pipe 40.

Furthermore, when the temperature increase rate and the detected temperature are below the set conditions, the operation valve 20 is closed and the cooling water pump 30 is stopped so that cooling is performed only through the engine 2.

Note that the conditions for the surface window may be determined depending on the temperature conditions that the bearing 103 can withstand. For example, as a condition for starting cooling by the cooling water pump 30, the temperature of the wall portion 103A is 100 degrees Celsius. above, and the temperature increase rate is 5°C/sea or more, and the wall portion 10
If the temperature of 3A is 200℃ or higher regardless of the temperature rise rate, for example, the wall temperature is 150℃, and if the temperature rise rate is 10℃/sea, the operating valve 20 The cooling water is increased by opening the pump 30 and increasing the amount of cooling water.Also, even if the wall temperature is 98°C, which is less than 100°C, even if the temperature increase rate is 5°C/sea or more, the cooling water is increased. The increase in weight is not performed.

As another example, if the wall temperature is 200° C. or higher, the amount of cooling water is increased in the same manner as described above even if the temperature increase rate is less than 5° C./sea.

The control operation of the controller 50 will be further explained with reference to the flowchart of FIG. It is determined whether the rate R is 5° C./sea or higher and whether the temperature Tw is 200° C. or higher, and if either is the case, the process proceeds to step S2 and the remote control valve 20 is opened. supplying a signal and a drive signal to the pump 30;
Cooling water is sent to the supercharger 1 via the supply pipe 40 to increase the amount of cooling water.

Further, when it is determined in step S1 that none of the setting conditions is met, the process proceeds to step S3, and the operation valve 20 is
A closing signal is supplied to the cooling water pump 30, and a stop signal is supplied to the cooling water pump 30 to stop the supply of cooling water through the supply pipe 40.

FIG. 5 shows another embodiment of the present invention, in which the temperature of lubricating oil in a bearing of a supercharger is directly detected by a temperature sensor. That is, in this example, the detection part of the temperature detection sensor 60A is connected to the jacket wall 103A.
The temperature of the lubricating oil supplied to the bearing 103 is directly detected through a lubricating oil passage (not shown) that is penetrated from the wall 103A to the bearing 103 side, and water and oil are prevented from leaking into each other at the portion where the wall portion 103A is penetrated. Since the water-cooled turbocharger configured in this way directly detects the oil temperature, it is more sensitive to heat generation in the bearing 103 due to lack of oil film or lack of lubricating oil. [Effect] As explained above, according to the present invention, cooling water is supplied from the radiator to the water jacket of the supercharger via the engine, In a water-cooled turbocharger that cools the bearing part through the jacket, a separate cooling water supply pipe is installed to directly lead cooling water from the radiator to the water jacket.
A remote control valve and an independent cooling water pump are installed in series in this cooling water supply pipe, and on the other hand, a means for detecting the temperature of the bearing part of the supercharger and a temperature data obtained from this temperature detecting means are installed. It has a calculator that calculates the rate of temperature change, and when the temperature change rate calculated by this calculator and the detected temperature meet predetermined conditions, the remote control valve is opened and the cooling water pump is driven. The system is equipped with a control means for controlling the supercharger so that before the bearing part of the supercharger reaches severe temperature conditions, an independent cooling water pump is driven via the control means to increase the amount of cooling water and perform supercharging. Since the machine is cooled, it is possible to prevent the bearing from increasing in temperature and causing seizure, and from deteriorating the lubricating oil.

[Brief explanation of the drawing]

Fig. 1 is a model diagram showing an example of the configuration of a water cooling device of a conventional water-cooled turbocharger; Fig. 2 is a model diagram showing an example of the configuration of a water cooling device of a water-cooled turbocharger of the present invention; Fig. 3 is a sectional view showing a state in which a temperature detection sensor is attached to the supercharger, Fig. 4 is a flowchart showing the control operation in the controller of the water-cooled turbocharger of the present invention, and Fig. 5 is a flowchart showing the control operation of the controller of the water-cooled turbocharger of the present invention. 01... Turbo supercharger, 2... Engine, 3... Lubricating oil supply pipe, □ 4... Lubricating oil return pipe, 5 - Cooling water supply pipe, 6... Cooling water return 9 pipe, 7... Digiator, 8... Cooling water introduction pipe, 9... Cooling water return pipe, 10... Reserve tank, 11 ...Radiator cap, 20...Remote control valve, 30...Cooling water pump, 40...Supply pipe, 50...Controller, '50A...Arithmetic unit, 60.601...Temperature Detection sensor, 70... Rotation speed detection sensor, 101... Bearing traction ring, 102... Water jacket, 103... Bearing portion, 103A... Wall portion, 1 104... Exhaust turbine , 105... Compressor, 106... Rotating shaft. Guichi] Figure 1 1! ” (62-

Claims (1)

[Scope of Claims] A water-cooled turbo supercharger in which engine cooling water is supplied to a water jacket of a supercharger, and a bearing portion of the supercharger is cooled through the water jacket (1). a cooling water supply pipe that directly leads cooling water from the water jacket to the water jacket;
a remote control valve and a cooling water pump provided in series with the cooling water supply pipe; a temperature detection means for detecting the temperature of the bearing; and a rate of change in the temperature based on temperature information obtained from the temperature detection means. and opens the remote control valve and drives the cooling water pump when the temperature change rate calculated by the calculator and the temperature information satisfy a predetermined condition. A water-cooled turbo supercharger characterized by comprising a control means for controlling the same. (Margin below)