JPH0658148A - Cooling device for internal combustion engine - Google Patents

Abstract

PURPOSE:To obviate a need for a countermeasure for the strength of a roof floor by arranging a radiator for cooling water at a high place, such as a roof, and coupling an expansion tank provided at the interior with a diaphragm and an air pressure regulating valve, a pump for the feed of water, and a pressure cistern, having a pump for the feed of water and a level switch, to a piping on the ground side. CONSTITUTION:A pump 13 attendant to a pressure cistern 12 is coupled to a piping 8b and the level switch 15 is provided. An expansion casing 16 comprises a diaphragm 18 of a rubber material, with which a casing 16c made of a metal is sealed, and an air regulating valve 21, and is provided with a water chamber on the upper side of the diaphragm 18 and an air chamber on the lower side thereof. When the temperature of cooling water for an internal combustion engine 1 is increased and the cooling water is expanded, water enters the water chamber, and the diaphragm 18 is lowered to balance a pressure. When a pressure in a piping is abnormally increased, a pressure response valve 19 is opened and water is escaped to the cistern 12. Since an expansion tank, a pressure cistern, and a water feeding means are arranged on the ground, there is no need for a countermeasure for the strength of a roof floor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine for supplying cooling water by installing a radiator used for cooling various internal combustion engines, such as a diesel engine, at a high place such as a rooftop. The present invention relates to improvement of an engine cooling device.

[0002]

2. Description of the Related Art A cooling device for an internal combustion engine of this type is constructed as shown in FIG. In the figure, 1 is an internal combustion engine such as a diesel engine, 2 is a roof-mounted radiator used for cooling the internal combustion engine, and 3 and 4 are radiator fans and fan driving motors attached to the radiator 2, respectively. Is. 5 is an expansion water tank / water supply tank, 5a is a level switch, 5b is piping connected to a water supply source such as water supply, 6 is a temperature control valve, 7 is a pump incorporated in the internal combustion engine, and 2 to 5 of these are provided. Is installed on the rooftop 11 indicated by the alternate long and short dash line. Reference numerals 8a and 8b denote forward pipes, 9a and 9b denote return pipes, 10a denotes a branch pipe, and 10b denotes a water supply pipe.

In the above structure, since the internal combustion engine 1 generates high-heat exhaust gas as it is driven, the exhaust gas is designed to be recovered by a heat recovery system (not shown). It is designed to be cooled by cooling water as follows. That is, the cooling water discharged from the radiator 2 is connected to the pipe 8a, the temperature control valve 6, and the pipe 8
is supplied to the internal combustion engine 1 via b and circulates through a path (not shown) provided in the internal combustion engine 1 to cool the internal combustion engine 1, and as a result, warmed hot water is supplied to the pipe 9a,
It is returned to the radiator 2 via 9b, taken out again as cooling water in the radiator 2, and cools the internal combustion engine 1 by the circulation route leading to the internal combustion engine 1 through the above route.
When the cooling of the internal combustion engine 1 progresses and the temperature of the hot water discharged from the pipe 9a reaches a relatively low predetermined temperature (for example, 80 ° C. or lower), the pipe 10a of the temperature control valve 6 which was initially closed, The passage between 8b communicates with each other, while the pipe 8
The passage between a and 8b is closed to form a bypass circuit connecting the pipes 9a, 10a and 8b, and the hot water is circulated to cool the internal combustion engine 1. The operation of the radiator 2 is stopped by turning off the motor 4. I was trying to do it.
The expansion water tank / water supply tank 5 absorbs water supply and replenishment to the radiator 2 and absorbs pressure fluctuations of the circulating water caused by fluctuations in the temperature of the circulating water.

[0004]

However, the conventional device has the following problems. In addition to the radiator 2, the expansion water tank and the water supply tank 5 are installed at a high place such as a rooftop. Since a considerable weight is installed at a high place, it is necessary to take measures such as the strength of the rooftop floor. It was It was necessary to have attached equipment such as a tank and piping for lifting the water supply for water supply to the water supply tank 5 arranged on the roof. The present invention has the above-mentioned problems (problems) of the conventional ones.
It is an object of the present invention to provide a cooling device for an internal combustion engine that solves the above problem.

[0005]

According to the present invention, a radiator for cooling water is installed at a high place such as a rooftop, and cooling water from the radiator is circulated and supplied through a pipe to cool an internal combustion engine. In the device, the invention relates to a cooling device for an internal combustion engine, in which an expansion tank and a pressure system turn are connected to each other in a pipe on the ground side of the circulation path through a branch pipe. In this case, the expansion tank may be provided internally with a diagram that is vertically moved by sliding and an air pressure adjusting valve, and the pressure system may be provided with a water supply pump and a level switch. In addition, it is desirable to provide an auxiliary branch pipe for draining to the pressure system via the pressure response valve to the branch pipe of the expansion tank. Further, a temperature control valve is provided in the circulation path, and when the cooling in the circulation path becomes lower than a predetermined temperature, the temperature control valve is operated to form a circulation loop that does not pass through the radiator to form an internal combustion engine. It is desirable to supply cooling water to the engine.

[0006]

In the cooling system for the internal combustion engine of the present invention, the expansion tank, the pressure system turn, the water supply means, etc., which are the pipe pressure adjusting means, are installed on the ground, so that it is unnecessary to take measures such as the strength of the roof floor. Also, auxiliary equipment such as piping for lifting the water supply to the roof is not required.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to an embodiment shown in FIG. In FIG. 1, the same components as those of the conventional one are denoted by the same reference numerals as those of FIG.
Reference numeral 12 is a pressure system turn, and a pump 13 attached to this pressure system turn is connected to a pipe 8b via a branch pipe 14. In addition, 12a is an intake of excess water in the pressure system 12, 12b is an intake for supplying water for pipe replenishment, and 15 is a level switch. Reference numeral 16 is an expansion tank such as an accumulator, which is connected to a pipe 8b through a branch pipe 17. As schematically shown in FIG. 1, the expansion tank 16 is composed of a diaphragm made of rubber or the like and a pneumatic pressure adjusting valve 21 enclosed in a metal casing 16c,
The casing 18 is divided by a diaphragm 18 so that the upper side of the diaphragm constitutes a water chamber 16a and the lower side thereof constitutes an air chamber, and the air pressure of the air chamber 16b set by an air pressure adjusting valve 21 and a branch pipe. The vertical position of the diaphragm 18 is changed so that the amount of water soluble in the water chamber 16a communicating with the 17 side is balanced. 1
Reference numeral 9 is a pressure response valve inserted in an auxiliary branch pipe 20 which is connected between the branch pipe 17 and a pressure system and has a predetermined pressure P.
_It opens when the pressure is ₄ (for example, 2.1 kgf / cm ² ) or more and closes when the pressure is less than the same. The radiator 2 is installed, for example, at a high place about 8 m above the floor level where the internal combustion engine 1 is arranged, and the radiator 2 is 0.8 kgf / cm ^{2 from the} internal combustion engine side due to this drop.
Shall have a pressure of. In addition, pressure system turn 12
The pump 13 is turned on when the pressure in the pipe 8b and thus in the branch pipe 14 is a predetermined pressure P ₁ (for example, 0.9 kgf / cm ² ), and is higher than this pressure P ₂ (for example, 1.3 kgf / cm ² ).
It is assumed that it is set to OFF at kgf / cm ² ). Further, the pressure set by the air pressure adjusting valve 21 of the expansion tank 16 is P ₃ (for example, 1.5 kgf /
cm ² ), and the working pipe pressure P of the pressure response valve 19
₄ (for example, 2.1 kgf / cm ² ) is set.

The cooling device for an internal combustion engine of the present invention is constructed as described above. Next, the operation will be described. (1) Cold state First, supply water to all piping of the cooling device. Initially, since the branch pipe 14 does not contain water, its pressure is zero, which is naturally P ₁ (0.9 kgf / cm ² ) or less, so that the pump 13 of the pressure system turn 12 is driven. As a result, the pressure systern 12 serves as a water supply source and water is supplied to the circulation paths of the pipes 14 and 8b, the pump 7, the internal combustion engine 1, the pipes 9a and 9b, the radiator 2, and the pipes 9a and 9b. When water is supplied to the entire circulation path, the pressure in the branch pipe 14 or the pipe 8b rises to reach P ₂ and the pump 13 stops, but the set pressure P ₃ (1.5 kgf in the expansion tank 16 is still reached.
/ Cm ² ), the diaphragm 18 of the expansion tank 16 is located at the top and the expansion tank 16 is filled with air only. (2) At the time of operation of internal combustion engine The circulation path of the cooling water at the predetermined time after the internal combustion engine 1 has started its operation is as described above. However, internal combustion engine 1
The cooling water expands as the temperature rises, and the pressure in each pipe also rises when it is continuously operated for a long time (this temperature rises in a short time because the outside temperature is high during the operation in summer). .
As a result, the pressure in the branch pipe 17, that is, the pipe 8b is P
_If it exceeds ₃ (1.5 kgf / cm ² ), the expansion tank 16
Water enters the water chamber 16a therein, and the diaphragm 18 descends until the pressure in the pipe 8b reaches a set temperature P3, and balances at the set pressure. If the pressure in the pipe rises abnormally due to the abnormality of the internal combustion engine 1 or the environment, it becomes difficult to adjust the pressure of the pipe only with the expansion tank 16. In this case, the pressure of the branch pipe 17, that is, the pipe 8b is P ₄ (2.
When the pressure becomes 1 kgf / cm ² ) or more, the pressure response valve 19 opens, water is released to the pressure system turn 12, and the pressure is adjusted to an appropriate value or less. (3) When the internal combustion engine is stopped When the internal combustion engine 1 is stopped and cooling is performed, the temperature of the hot water discharged from the pipe 9a is a relatively low predetermined temperature (for example, 80 ° C).
And the following), the passage between the pipes 10a and 8b of the temperature control valve 6 which was initially closed is closed and the pipe 9a,
By forming a bypass circuit connecting 10a and 8b and circulating the hot water, the internal combustion engine 1 is further cooled. On the other hand, in the expansion tank 16, when the pressure in the pipe 8b drops,
The diaphragm 18 rises and returns water from the water chamber 16a to the branch pipe 17. Further, the pressure drop in the pipe 8b is gradually increased P
_{When the number} becomes ₃ or less, the diaphragm 18 is fixed to the uppermost position as it is, and the expansion tank 16 is completely filled with air to return to the initial state.

[0009]

The present invention is constructed as described above and automatically adjusts the pressure in the pipe of the cooling water supplied to the internal combustion engine so that it is always within a predetermined pressure. By installing the expansion tank, the pressure system and the water supply means, which are the means, on the ground, the following excellent effects are obtained. In the prior art, in addition to the radiator, it was necessary to install an expansion water / water supply tank and a water supply for water supply at a high place such as a rooftop, but in the internal combustion engine cooling device of the present invention, install the parts other than the radiator on the ground. This made it unnecessary to take measures such as the strength of the rooftop floor, and it was no longer necessary to lift the water supply for water supply to the rooftop. Further, in the present invention, the expansion tank is connected to the pipe so that the water pressure of the pipe is always maintained at a predetermined value, and when the water pressure of the cooling water pipe is abnormally increased, the pressure response valve and the pressure system turn the cooling water. By discharging the water, the rupture of the pipe and the overheating of the internal combustion engine are prevented.

[Brief description of drawings]

FIG. 1 is a piping diagram showing a configuration of a cooling device for an internal combustion engine to which the present invention is applied.

FIG. 2 is a piping diagram showing a configuration of a conventional internal combustion engine cooling device.

[Explanation of symbols]

 1: Internal Combustion Engine 2: Radiator 6: Temperature Control Valve 8b: Ground Side Pipe 12: Pressure System Turn 13: Water Supply Pump 15: Level Switch 16: Expansion Tank 18: Diaphragm 19: Pressure Response Valve 20: Auxiliary Branch Pipe

Claims (5)

[Claims] 1. A cooling device for an internal combustion engine, wherein a radiator for cooling water is installed at a high place such as a rooftop, and the cooling water from the radiator is circulated and supplied to the internal combustion engine through a pipe. A cooling device for an internal combustion engine, characterized in that an expansion tank and a pressure system turn are connected to each other through a branch pipe in the aboveground side pipe. 2. The cooling device for an internal combustion engine according to claim 1, wherein the expansion tank is provided with a diagram which is vertically moved by sliding and an air pressure adjusting valve. 3. The cooling device for an internal combustion engine according to claim 1, wherein the pressure system turn is provided with a water supply pump and a level switch. 4. The cooling device for an internal combustion engine according to claim 1, wherein an auxiliary branch pipe for draining to a pressure system turn is provided to the branch pipe of the expansion tank via a pressure response valve. 5. A temperature control valve is provided in the circulation path, and when the cooling water in the circulation path becomes a predetermined temperature or lower,
5. The cooling device for an internal combustion engine according to claim 1, wherein the cooling water is supplied to the internal combustion engine by operating the temperature control valve to form a circulation loop that does not pass through the radiator.