JPS58133415A - Cooling device of prime mover - Google Patents

Abstract

PURPOSE:To improve starting and warming characteristic of an engine, by accumulating an almost total amount of warmed cooling water in a heat insulating tank after a stop of the engine and supplying the cooling water from the heat insulating tank to the engine at its starting. CONSTITUTION:A heat insulating tank 3 is connected to an output pipe 1 of a radiator R through a connecting pipe 7 equipped with a solenoid valve 9, and a connecting pipe 4 equipped with a pump 12 and solenoid valve 8 to reach a water pump P via an intake manifold 5 is connected to said tank 3. When an engine is stopped, the valve 8 is closed and the valve 9 and a solenoid valve 10 for air bleed of the tank 3 are opened to accumulate an almost full amount of warmed cooling water in the tank 3, after elapsed a prescribed time, the valves 9, 10 are closed. At starting, the valves 8, 10 are opened, after the cooling water is supplied to an engine cooling system, the valves 8, 10 are closed. Further a negative pressure valve 11 is provided to the upper end of the radiator.

Description

[Detailed Description of the Invention] The present invention is a cooling system for a prime mover such as an internal combustion engine, in particular, a heat insulating tank is provided in the middle of a cooling water flow path that is constructed by combining an engine body and a radiator. When the engine is not running, almost all of the cooling water is stored in this heat insulating tank to maintain the cooling water at the steady state temperature when the engine is running, so that warm-up operations can be carried out efficiently when the engine is running again. This invention relates to a cooling system for a prime mover that has been improved.

Conventionally, when starting a water-cooled engine in a car or the like after it has been stopped for a long time, it has been necessary to warm up the engine as needed, especially when the outside temperature is low.

To deal with this, warm-up is attempted by enriching the air-fuel mixture by operating a check valve installed in the carburetor, but this requires an extremely large amount of fuel to be supplied and is uneconomical. The running performance of the car was poor, and it took a considerable amount of time for the heater to start working. Furthermore, in air-cooled engines, although the engine startability and warm-up performance are relatively good, the stability of the heater temperature is poor, the engine noise is large, and the heat load resistance is poor.

The present invention was created in order to solve the above-mentioned problems in conventional prime movers, and its purpose is to provide a cooling device for a prime mover that can improve the startability and warm-up performance of a prime mover. It is something.

In the present invention, a heat insulating tank capable of storing almost the entire amount of cooling water is installed in the middle of the cooling water flow path between the engine body and the radiator, and is insulated from the outside world.After the engine is stopped, the cooling water heated by the engine is circulated. Cooling of a prime mover characterized by configuring a flow path system in which water is stored in a heat insulating tank, reaches the engine from the heat insulating tank when the engine is started, and circulates between the engine and the radiator when the cooling water reaches room temperature. It is related to the device.

Hereinafter, a detailed description will be given based on an example. The attached drawing schematically shows a water-cooled automobile engine (F) equipped with a cooling device according to the present invention, and in the drawing (R) is Radiator, (F) is cooling fan, (P) is engine (
The water pump (in) is integrally attached to the water pump (in), and the outgoing pipe (2) connects the radiator (R) and the water pump (P), the base end of which is connected to the water jacket of the engine (E) and the other end is This is a selection pipe that connects to the radiator (R), and a thermostatic valve (TV) is installed in the middle, so the valve will not open unless the temperature rises above room temperature, and the cooling water will flow to the engine (E).
Circulate only parts. Furthermore, (3) is a heat insulating tank with an internal volume that can store all of the cooling water, and (4) is a vaporizer (
C) The first connecting pipe towards the manifold (5) formed nearby, (6) is the manifold and water pump (P)
A second connecting pipe (7) is a third connecting pipe which is provided so as to branch from the middle of the outgoing pipe (1) and has an open end inside the heat insulating tank (3). A solenoid valve (8), (
9), and a solenoid valve (to) is provided in 1 (3a) of the heat insulating tank (3), and these three solenoid valves (81, +9), α
The figure is the vehicle body (not shown) on which the engine (E) is installed.
Each solenoid valve (81, (9), (
The interlocking of the on-off valve of Ill is controlled.

In addition, (11) is a negative pressure valve that is installed in the upper part of the radiator (R) and closes when the internal pressure of the radiator increases, and opens when the pressure becomes negative than the outside pressure, and (12) is the negative pressure valve of the first qualified pipe (4). A manifold (5) is installed midway from the heat retention tank (3)
) is a pump for supplying cooling water to the electric 1i valve (81
, (91,m), its operation is controlled by a control unit.

The operation of the cooling device equipped with the heat retention tank (3) that stores cooling water in the cooling water flow path system as described above will be described as follows.
First, when the engine (E) is stopped, the solenoid valve (
8) is closed, and the other two solenoid valves (9) and Ql are closed.
The negative pressure valve (11) also opens as the pressure inside the radiator (R) decreases. As a result, the upper side is opened by opening this negative pressure valve (11), and the lower side is opened by opening the solenoid valve (to) and the radiator (R) and the heat insulation tank 131.
Both are open to the atmosphere, and the circulating cooling water flows into the heat retention tank (3) located below the radiator (R) and engine (E) and is stored there. When the entire amount reaches the heat insulating tank (3), the solenoid valve (9) and Ql close, blocking the flow path to the radiator (R) and engine (E), and cutting off the outside of the tank. Become. Therefore, the cooling water in the heat insulating tank (3) is insulated from the outside world, and the temperature at the time of inflow is (T).
) is stored in a state where it is maintained. This temperature TI is calculated as follows: If the temperature of the cooling water directly fed from the engine (E) is (T2), and the temperature of the cooling water fed after being cooled by the radiator (R) is (T3), 'r3 <T, <T
There is a relationship of 2, and the temperature of the cooling water stored in the heat insulating tank (3) is at least higher than the outside air temperature.

Next, when the engine (E) is started, the solenoid valve (8).

(To) opens, and the pump (12) operates to move the heat insulating tank (3) to the manifold (5) of the engine (E).
) Cooling water maintained at the temperature (T1) is now supplied to the section. When this engine (E) is started, only a small amount of cooling water is present in the water jacket of the engine, and as mentioned above, all the cooling water is supplied from the heat insulating tank (3) to the engine (E) and radiator. The cooling system of the gusset engine CF, which circulates between (R) and CF, is the same as an air-cooled type, so starting performance is improved. In addition, since the supplied water, which has a higher temperature than the outside air, passes near the vaporizer (C), the vaporizer is warmed within a short time, promoting vaporization and improving starting performance.

In addition, as mentioned above, cooling water with a temperature higher than the outside air flows into the water jacket via the water pump (P), so the engine (E) body is also warmed, and the startability is excellent, with no supply required, and warm-up performance is also very good. Become something. When the cooling water temperature reaches room temperature, the thermostatic valve (TV) in the select pipe opens, and the cooling water that has passed through the i-ta jacket goes from the return pipe (2) into the radiator (R), and from the return pipe (11 to the water pump (P) and the engine (E).If the capacity of the pump (12) is properly selected, at the above point all the cooling water will flow into the cooling water flow connecting the radiator (R) and the engine (E). The solenoid valve +8) and Ql close together, and the negative pressure valve (11) also closes due to the rise in pressure inside the radiator (R), forming a closed circuit for the cooling water. When this condition is reached, comfortable driving becomes possible.

As mentioned above, when the engine (E) is started, the engine (L) operates like an air-cooled type, and the heated cooling water can warm the engine body, resulting in good startability and a short warm-up time. You can do it on time.

When the engine (B) is stopped, as described above, the cooling water whose temperature is at least higher than the outside air temperature is stored in the heat insulating tank (3), and when the engine is restarted, the same cycle as described above is performed.

As described above, the cooling device according to the present invention has the following effects.

(11) Since the warm-up operation can be significantly reduced, the amount of fuel consumed for warm-up can be reduced, resulting in excellent economic efficiency.

(2) The above reduction in fuel consumption also reduces the amount of exhaust gas, which helps in pollution prevention measures.

(3) Since the engine starts easily, it is possible to reduce the frequency of failures in the starting system such as the starter.

[Brief explanation of the drawing]

The figure is a side view schematically showing a state in which a water-cooled automobile engine is equipped with a cooling device according to the present invention. (E) Engine (R) Radiator (3) Heat retention tank

Claims (1)

[Claims] (1) Engine body and radiator cooling water flow path.
A heat insulating tank capable of storing almost the entire amount of cooling water is placed insulated from the outside world, and after the engine has stopped, the coolant heated by the engine is stored in the heat tank, and when the engine is running, it is heated by the engine. A cooling device for a prime mover, characterized by configuring a wave path system in which cooling water reaches the engine from the heat insulating tank, and circulates between the engine and the radiator when the cooling water reaches room temperature.