JPH03279613A - Cooling device in internal combustion engine - Google Patents

Abstract

PURPOSE:To automatically adjust an opening working temperature according to the outside air temperature without incurring complexity in structure by providing a nozzle for spraying cooling water to a temperature sensing working element on a thermostat valve. CONSTITUTION:A nozzle 15 with a small diameter is provided on a thermostat valve 6, and cooling water in a lower tank 2b in a return circulating pipe line 5 or a radiator 2 is sprayed to a temperature working element 12. In this way, the temperature sensing working element 12 works so that it opens a main valve 13 and closes an auxiliary valve 14 at the average temperature of the temperature of the cooling water from a bypass pipe line 10 and the temperature of the cooling water from the nozzle 15. Here, the temperature of the cooling water from the nozzle 15 is in proportional to the outside air temperature as it is cooled by the radiator 2. Thus, the temperature which works so that the main valve 13 is opened and the auxiliary valve 14 is closed is automatically adjusted according to the outside air temperature. Accordingly, the opening working temperature of the thermostat valve 6 can be automatically adjusted according to the outside air temperature without complicating the structure.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cooling device that cools an internal combustion engine using cooling water that circulates between a cooling water jacket and a radiator in the internal combustion engine. be.

[Conventional technology]

In general, this type of cooling device introduces cooling water from a cooling water outlet in the internal combustion engine to the radiator between a cooling water jacket and a radiator in the internal combustion engine, and then uses a cooling water pump to introduce the cooling water in the internal combustion engine. while forming a circulation path back to the jacket, and a return circulation path from the radiator to the suction side of the cooling water pump,
related to the temperature of the cooling water flowing in a bypass line branching from the cooling water outlet or branching from the outlet circulation line leading from the cooling water outlet to the radiator and leading to the suction side of the cooling water pump; A thermostatic valve is provided which operates to close the return circulation line when the temperature is low and to open the return circulation line when the temperature rises.

Although the temperature when the thermostatic valve is operated from closed to open should be set to a high temperature when the outside temperature is low and a low temperature when the outside temperature is high, the conventional thermostatic valve does not Since the temperature when operating from closed to open is constant regardless of the outside temperature, thermostatic valves are designed to be suitable for cold regions where outside air temperature is low, and those that are suitable for warm regions where outside air temperature is high. As shown in the figure, multiple types had to be manufactured.

Therefore, as prior art, JP-A-57-33276 and JP-A-60-121377 disclose that the stopper that the piston in the temperature-sensitive actuating body of the thermostatic valve comes into contact with is exposed to outside air from the outside of the valve box of the thermostatic valve. By moving back and forth depending on the temperature, it is proposed to automatically adjust the operating temperature at the thermostatic valve so that it is high when the outside temperature is low and low when the outside temperature is high.

[Problem to be solved by the invention]

However, as in this prior art, configuring the stopper that the piston contacts in the temperature-sensitive actuator to move back and forth from the outside of the valve box in the thermostatic valve depending on the outside temperature requires a significantly complicated structure. Therefore, there are problems in that the manufacturing cost increases significantly and the thermostatic valve becomes larger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that can automatically adjust the operating temperature of a thermostatic valve according to the outside air temperature without causing problems like those of the prior art. It is something to do.

[Means to solve the problem]

In order to achieve this object, the present invention provides cooling water in the internal combustion engine by guiding cooling water from a cooling water outlet in the internal combustion engine to the radiator between the cooling water jacket and the radiator in the internal combustion engine, and then using a cooling water pump to cool the engine. A circulation path is configured to return to the water jacket, while an outlet circulation path branches from the cooling water outlet or leads from the cooling water outlet to the radiator in a return circulation path from the radiator to the suction side of the cooling water pump. It is related to the temperature of the cooling water flowing in the bypass pipe branched from the cooling water pump to the suction side of the cooling water pump, when the temperature is low, the return circulation pipe is blocked, and when the temperature is high, the return circulation pipe is closed. In a cooling device comprising a thermostatic valve that operates to communicate with the thermostatic valve, the thermostatic valve is configured to spray cooling water in the radiator or the return circulation pipe against a temperature-sensitive actuating element in the thermostatic valve. The structure is such that a nozzle is installed.

[Action/effect of the invention]

In this configuration, the temperature-sensitive actuating body in the thermostatic valve is sprayed with cooling water flowing from the cooling water outlet through the bypass line to the suction side of the cooling water pump, and at the same time, cooling water in the radiator or return circulation line is sprayed. Sprayed through a nozzle.

In this case, the temperature of the cooling water in the radiator or return circulation pipe is reduced by cooling the radiator.
Since the temperature is lower than the temperature of the cooling water flowing in the bypass pipe, the temperature when the temperature-sensitive actuator opens and operates to communicate with the return circulation pipe is lower than that of the cooling water from the bypass pipe. The temperature of the temperature-sensitive actuating body is lowered by the amount that the cooling water at a lower temperature in the radiator or return circulation pipe is sprayed against the temperature-sensitive actuating body.In other words, the temperature-sensitive actuating body is The average temperature of the cooling water from the road and the temperature of the cooling water from the nozzle,
It opens and operates to communicate with the return circulation pipe.

In addition, since the cooling water in the radiator or return circulation pipe is cooled by the radiator, its temperature is low when the outside air temperature is low and high when the atmospheric temperature is high. As mentioned above, since it is proportional to the outside air temperature, the opening temperature of a thermostatic valve is automatically adjusted according to the outside air temperature, increasing when the outside temperature is low and lowering when the outside temperature is high. It is.

Therefore, according to the present invention, by providing the thermostatic valve with a nozzle for spraying low-temperature cooling water in the radiator or return circulation pipe toward the temperature-sensitive actuating body, the opening operating temperature of the thermostatic valve can be adjusted. can be automatically adjusted according to the outside temperature, which has the effect of not complicating the structure and, by extension, increasing the manufacturing cost and size, unlike the prior art.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings (FIG. 1). In the figure, the reference numeral 1 indicates an internal combustion engine, and the reference numeral 2 indicates an air-cooled radiator. There is a cooling water outlet 1a in the cooling water jacket of the internal combustion engine 1 between
The cooling water is led to the upper tank 2a of the radiator 2 through the outlet circulation pipe 3, and then from the lower tank 2b of the radiator 2 to the suction side of the cooling water pump 4 via the return circulation pipe 5 to the internal combustion engine. A circulation path is configured to return the cooling water to the cooling water jacket in No. 1.

Reference numeral 6 indicates a conventionally well-known bottom bypass type thermostatic valve provided in the middle of the return circulation pipe 5, and a valve case 7 of the thermostatic valve 6 contains a cooling water population 8 from the lower tank 2b of the radiator 2. The cooling water outlet 9 to the suction side of the cooling water pump 4 is open, and the cooling water outlet 11 from the bypass pipe 10 branched from the cooling water outlet 1a or the outlet circulation pipe 3 is open. are doing.

Further, inside this valve case 7, there is a temperature-sensitive actuating body 12, a main valve element 13 that normally closes the cooling water supply 8 from the lower tank 2b of the radiator 2, and a cooling water supply from the bypass pipe 10. 11 is normally open, and when the temperature of the cooling water flowing into the valve case 7 from the bypass pipe line 10 and flowing out from the cooling water outlet 9 to the cooling water pump 4 increases, the temperature sensing Due to the expansion of the actuating body 12, the sub-valve body 14 closes the cooling water port 11 from the bypass pipe 10, while the main valve body 13 operates to open the cooling water port 8 from the lower tank 2b in the radiator 2. It is configured as follows.

Then, a small diameter nozzle 15 is attached to the thermostatic valve 6.
is provided through the valve case 7 so that the tip opening 15a of the nozzle 15 faces the temperature-sensitive actuating body 12 in the valve case 7, and the return circulation pipe 5 is provided at the inlet end of the nozzle 15. or lower tank 2b in radiator 2
By connecting the cooling water extraction pipe 16 branched from the cooling water extraction pipe 16, the cooling water in the return circulation pipe 5 or the lower tank 2b of the radiator 2 is sprayed onto the temperature-sensitive actuating body 12 through the nozzle 15. Configure.

In this configuration, cooling water flowing from the cooling water outlet 1a or the outlet circulation pipe 3 to the suction side of the cooling water pump 4 via the bypass pipe IO is sprayed onto the temperature-sensitive actuating body 12 in the thermostatic valve 6. Cooling water in the return circulation pipe 5 or in the lower tank 2b of the radiator 2 is sprayed through the nozzle 15.

In this case, the return circulation pipe or the radiator 2
Since the temperature of the cooling water in the lower tank 2b is lower than the temperature of the cooling water flowing in the bypass pipe 10 by the radiator 2, the temperature of the cooling water in the lower tank 2b is lower than that of the cooling water flowing in the bypass pipe 10. opens and the sub valve body 14
The temperature at which the temperature sensitive actuator 12 operates to close is lower than the temperature of the cooling water from the bypass pipe 10.
The low temperature cooling water in the return circulation pipe 5 or the lower tank 2b of the radiator 2 is blown away from the nozzle 15. In other words, the temperature-sensitive actuating body 12 The main valve body 13 is operated to open and the sub-valve body 14 is closed at the average temperature of the cooling water from the pipe line 10 and the temperature of the cooling water from the nozzle 15.

On the other hand, since the cooling water in the return circulation pipe 5 or the lower tank 2b of the radiator 2 is cooled by the radiator 2, its temperature is low when the outside air temperature is low and becomes high when the atmospheric temperature is high. Since it is proportional to the outside air temperature, in the thermostatic valve 6, the main valve element 13 is closed and the sub-valve element 14 is open, so that the main valve element 13 opens and the sub-valve element 14 closes. The operating temperature is automatically adjusted according to the outside temperature, increasing when the outside temperature is low and decreasing when the outside temperature is high.

Moreover, FIG. 2 shows another embodiment, and this embodiment shows a case where a very ordinary thermostatic valve 6a is used in place of the bottom bypass type thermostatic valve 6, and in this case, Also, the thermostatic valve 6
In a, the nozzle 15 connected to the return circulation pipe 5 or the cooling water extraction pipe 16 branched from the lower tank 2b of the radiator 2 is connected to the valve body 1, 3a of the thermostatic valve 6a to open and close the nozzle 15. Warming body 12a
It can be similarly applied by configuring the cooling water in the return circulation pipe 5 or the lower tank 2b of the radiator 2 to be sprayed against the temperature-sensitive actuating body 12a. It can be done.

Note that the nozzle 15 in both of the above embodiments is provided with a throttle orifice 17 for flow rate adjustment, and by increasing or decreasing the amount of cooling water jetted from the nozzle 15 by the diameter of the throttle orifice 17, both thermostatic valves 6, It is configured such that the operating temperature of 6a can be adjusted as desired.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 shows the first embodiment, and FIG. 2 shows the second embodiment. 1...Internal combustion engine, 1a...Cooling water outlet, 2...Radiator, 2a...Upper tank,
2b...lower tank, 3...outlet circulation pipe, 4
... Cooling water pump, 5 ... Return circulation pipe, 6,
6a...Thermostat valve, 7...Valve case,
IO...Bypass pipe line, 12.12a...Temperature-sensitive operating body, 13°13a...Main valve body, 14...Sub-valve body, 15...Nozzle, 16. ... Cooling water extraction pipe line, 17... Throttle orifice.

Claims (1)

[Claims] (1) A circulation path between the cooling water jacket and the radiator in the internal combustion engine that leads the cooling water from the cooling water outlet in the internal combustion engine to the radiator, and then returns to the cooling water jacket in the internal combustion engine using the cooling water pump. In the return circulation line from the radiator to the suction side of the cooling water pump, the cooling water is branched from the cooling water outlet or branched from an outlet circulation line leading from the cooling water outlet to the radiator. It is related to the temperature of the cooling water flowing in the bypass pipe leading to the suction side of the water pump, and when the temperature is low, the return circulation pipe is closed, and when the temperature is high, the return circulation pipe is opened. In the cooling device, the thermostat valve is provided with a nozzle configured to spray the cooling water in the radiator or the return circulation pipe toward the temperature-sensitive actuating body of the thermostat valve. A cooling device for an internal combustion engine characterized by: