JP2009215903A - Circulation device for cooling water in internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To operate a thermostatic valve 8 even when the amount of cooling water from a bypass circulation path 7 is small, in a circulation device for cooling water constituted by providing the thermostatic valve 8 on a suction side of a cooling water pump 4 to a cooling water jacket of an internal combustion engine 1, connecting: a main circulation path 6 leading from the cooling water jacket via a heat exchanger for cooling the internal combustion engine 1 such as a radiator 2; and the bypass circulation path 7 leading from the cooling water jacket via a volume part such as an vehicle interior heater 3 to the thermostatic valve 8, and making the cooling water circulate through the bypass circulation path 7 when the cooling water temperature is low and circulate through both of the bypass circulation path 7 and the main circulation path 6 when the cooling water temperature rises. <P>SOLUTION: A temperature sensing part 12 of the thermostatic valve 8 is provided in a reservoir part arranged within a valve case 11 of the thermostatic valve 8 to temporarily store the cooling water from the bypass circulation path 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for circulating cooling water in an internal combustion engine between the internal combustion engine and a volume portion such as a heat exchanger for cooling an internal combustion engine such as a radiator and a vehicle interior heater.

  Conventionally, this type of cooling water circulation device is configured as described in Patent Document 1, for example.

  That is, a thermostat valve is provided on the suction side of the cooling water pump connected to the cooling water inlet to the cooling water jacket in the cylinder block of the internal combustion engine, and the thermostat valve is connected to the radiator from the cooling water jacket in the cylinder head of the internal combustion engine. A main circulation path that passes through the heat exchanger for cooling the internal combustion engine, such as a heater, and at least a volume part such as a heater for the passenger compartment from the cooling water jacket in the cylinder head without passing through the heat exchanger for cooling the internal combustion engine such as the radiator. By connecting both to the bypass circulation path, the cooling water is stopped from circulating through the main circulation path in the initial stage of the internal combustion engine when the temperature of the cooling water is lower than a predetermined value. Circulating through the circulation path, but the temperature of the cooling water rises to the specified value , And a configuration that switching from the circulation through the bypass circulation path circulating through both the bypass circulation path and the main circulation path.

As is well known, the thermostat valve includes a temperature sensing part and a valve body in the valve case, and the temperature sensing part is cooled by flowing into the valve case from the bypass circulation path. When the temperature is low and the temperature is low, the valve body closes the main circulation path, but when the temperature rises, the main circulation path is opened by thermal expansion. .
JP 2003-120296 A

  However, of the two cooling water circulation paths, the bypass circulation path is narrower than the main circulation path, and in addition to the fact that air tends to accumulate in the middle part of the cooling water circulation path, Particularly in the volume portion, air easily collects, and when these air reservoirs are generated, there is a case where the amount of cooling water flowing from the bypass circulation path is significantly reduced.

  In particular, when all the cooling water is once discharged and reinjected when the cooling water is replaced, a large amount of air accumulates in the volume portion of the vehicle interior heater or the like in the middle of the bypass circulation path, in other words, the vehicle interior heater. Since the cooling water in the volume part such as the inside is almost empty, even if the cooling water is sent from the internal combustion engine to the bypass circulation path, the amount of the cooling water returning from the volume part such as the heater for the passenger compartment is not enough. There were many situations where there was a significant decrease.

  On the other hand, in the conventional thermostat valve, the cold water flowing from the bypass circulation path into the valve case immediately flows out from the valve case, so that the cold water flowing from the bypass circulation path is However, in the situation where the cooling water in the cooling water jacket of the internal combustion engine has risen to a predetermined temperature, the opening of the main circulation path by the temperature sensing portion is not immediately performed, Since the opening operation of the main circulation path is considerably delayed, the temperature of the cooling water in the internal combustion engine becomes abnormally higher than a predetermined value during that time.

  It is a technical object of the present invention to provide a cooling water circulation device that solves this problem.

In order to achieve this technical problem, claim 1 of the present invention provides:
“A thermostat valve is provided on the suction side of the cooling water pump to the cooling water jacket in the internal combustion engine. The main circulation path extending from the cooling water jacket through the heat exchanger for cooling the internal combustion engine to the thermostat valve, and the cooling Connect both the water jacket and the bypass circulation path that goes through at least the volume without passing through the heat exchanger for cooling the internal combustion engine, and circulate the cooling water through the bypass circulation path when the temperature is low. A cooling water circulation device configured to circulate through both the bypass circulation path and the main circulation path when the temperature rises;
The temperature sensing part in the thermostat valve is provided in a reservoir part configured to temporarily accumulate cooling water from the bypass circulation path in the valve case of the thermostat valve. "
It is characterized by that.

Claim 2 of the present invention includes:
“In the first aspect of the present invention, the volume portion is a vehicle interior heater.”
It is characterized by that.

Claim 3 of the present invention provides:
“In the first or second aspect of the invention, the pool portion is configured by providing a weir plate on the inner bottom surface of the valve case.”
It is characterized by that.

Claim 4 of the present invention provides:
“In the first or second aspect of the invention, the pool portion is configured by providing an outlet to the cooling water pump at a position higher than the temperature sensing portion.”
It is characterized by that.

  According to the configuration of the first aspect, the cooling water flowing from the bypass circulation path into the valve case of the thermostat valve does not immediately flow out of the valve case, but accumulates in the reservoir portion of the valve case. Since the temperature sensing part is immersed in the cooling water accumulated in the reservoir, even if the cooling water from the bypass circulation path is reduced, the temperature sensing part is sensitive to the temperature change of the cooling water. Will respond.

  As a result, the main circulation path can be opened and operated immediately without delay according to the temperature rise of the cooling water, so that the temperature of the cooling water in the internal combustion engine is in the interval until the main circulation path is opened and operated. It can be reliably prevented from becoming abnormally high.

  In particular, according to the configuration described in claim 3 or 4, the formation of the cooling water reservoir in the valve case of the thermostat valve can be reliably realized by a very simple configuration, and the thermostat valve is There is an advantage that it can be surely coped with when it is provided at a position higher than the cooling water pump.

  Embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes an internal combustion engine in which a cylinder head is fastened to a cylinder block as conventionally known, reference numeral 2 denotes an air-cooled radiator for cooling water of the internal combustion engine, and reference numeral 3 denotes Each of the heaters for the vehicle interior, which is an example of the volume portion, is shown.

  The cooling water sent to the cooling water jacket in the cylinder block of the internal combustion engine 1 by the cooling water pump 4 driven by the internal combustion engine 1 is transferred from the cooling water jacket in the cylinder block to the cooling water jacket in the cylinder head. Inflow.

  And between the cooling water outlet 5 in the cylinder head and the suction side of the cooling water pump 4, a main circulation path 6 provided with the radiator 2 and a heater 3 for the vehicle interior were provided in the middle. It is connected via both the bypass circulation path 7.

  On the suction side of the cooling water pump 4, a thermostat valve 8 having connection ports 9 and 10 to both the main circulation path 6 and the bypass circulation path 7 is provided.

  As shown in FIG. 2, the thermostat valve 8 has a structure in which a temperature sensing portion 12, a valve body 13 and a spring 14 are built in a valve case 11 having the connection ports 9 and 10.

  In the state where the temperature of the cooling water is low, the connection of the connection port 9 to the main circulation path 6 in the valve case 11 in the connection ports 9 and 10 is blocked by the valve body 13. When the temperature of the valve body 13 rises, the valve body 13 opens and operates against the spring 14 due to thermal expansion of the temperature sensing portion 12, and the connection port 9 for the main circulation path 6 communicates with the valve case 11. It is the composition of doing.

  In addition to the fact that the coolant outlet 5 in the cylinder head and the connection port 10 to the bypass circulation path 7 in the thermostat valve 8 are connected via the bypass circulation path 7, The cooling water jacket 16 in the EGR control valve, the cooling water jacket 17 in the throttle valve, and the EGR are connected in the middle of the second bypass circulation path 15. At least one of the coolers 18 or the like is provided.

  In the first embodiment, the portion of the inner bottom surface 11a of the valve case 11 of the thermostat valve 8 between the outlet 19 to the cooling water pump 4 and the temperature sensing unit 12 is directed upward. By providing the protruding weir plate 20, the cooling water flowing into the portion 11 b of the temperature sensing portion 12 in the valve case 11 from the connection port 10 to the bypass circulation path 7 and the second bypass circulation path 15. Is temporarily stored, and a part or all of the temperature sensing unit 12 is immersed in the stored cooling water.

  That is, the temperature sensing part 12 in the thermostat valve 8 is provided in a reservoir part configured to temporarily accumulate cooling water from the connection port 10 in the valve case 11 in the thermostat valve 8. It has become.

  In this configuration, the cooling water flowing into the valve case 11 of the thermostat valve 8 from the connection port 10 for both the bypass circulation path 7 and the second bypass circulation path 15 is caused by the presence of the dam plate 20. After temporarily accumulating in the part 11b of the temperature sensing part 12 in the valve case 11, it will be sucked into the cooling water pump 4, and a part or all of the temperature sensing part 12 is always used as cooling water. It can be maintained in an immersed state.

  Thereby, the temperature sensing part 12 in the thermostat valve 8 quickly and reliably responds to the temperature of the cooling water flowing from the connection port 10 to both the bypass circulation path 7 and the second bypass circulation path 15. When the cooling water flowing from the connection port 10 decreases, it is possible to reliably reduce the delay in the opening operation of the connection port 9 of the main circulation path 6 by the valve body 13.

  FIG. 3 shows a thermostat valve 8 'according to the second embodiment.

  As in the case shown in FIG. 2, the thermostat valve 8 'includes a temperature sensing portion 12', a valve body 13 'and a spring 14' in a valve case 11 'having the connection ports 9' and 10 '. When the temperature of the cooling water is low, the connection of the connection port 9 'to the main circulation path 6 in the valve case 11' of the connection ports 9 'and 10' is blocked by the valve body 13 '. However, when the temperature of the cooling water rises, the valve body 13 ′ opens and operates against the spring 14 ′ by the thermal expansion of the temperature sensing portion 12 ′, and is connected to the main circulation path 6. The opening 9 'communicates with the valve case 11'.

  In addition to this, the thermostat valve 8 'has an outlet 19' from the valve case 11 'to the cooling water pump 4 at a position higher than the inner bottom surface 11a' of the valve case 11 '. The coolant flowing in from the connection port 10 ′ to the bypass circulation path 7 and the second bypass circulation path 15 is temporarily stored in the portion 11 b ′ of the temperature sensing part 12 ′ inside the valve case 11 ′. In this configuration, a part or all of the temperature sensing part 12 'is immersed in the accumulated cooling water.

  That is, the temperature sensing part 12 'in the thermostat valve 8' is a reservoir part configured to temporarily accumulate cooling water from the connection port 10 'in the valve case 11' in the thermostat valve 8 '. It is configured to be provided.

  Also in this configuration, the cooling water flowing from the connection port 10 ′ to both the bypass circulation path 7 and the second bypass circulation path 15 into the valve case 11 ′ of the thermostat valve 8 ′ 'Is temporarily accumulated in the portion 11b' of the temperature sensing part 12 'and then sucked into the cooling water pump 4 so that part or all of the temperature sensing part 12' is always cooled. Since it can be maintained in a state immersed in water, it is possible to reliably reduce the delay in the opening operation of the connection port 9 'of the main circulation path 6 by the valve body 13'.

It is a figure which shows the circulation path of the cooling water with respect to an internal combustion engine. It is a vertical front view of the thermostat valve in a 1st embodiment. It is a vertical front view of the thermostat valve in 2nd Embodiment.

Explanation of symbols

1 Internal combustion engine 2 Radiator (Heat exchanger for cooling internal combustion engine)
3 Heater for vehicle interior 4 Cooling water pump 6 Main circulation path 7 Bypass circulation path 8, 8 'Thermostat valve 9, 9' Main circulation path connection port 10, 10 'Bypass circulation path connection port 11, 11' Valve case 12 , 12 'Temperature sensing part 13, 13' Valve body 19, 19 'Cooling water outlet 20 Dam plate

Claims (4)

A thermostat valve is provided on the suction side of the cooling water pump to the cooling water jacket in the internal combustion engine. A main circulation path extending from the cooling water jacket through the heat exchanger for cooling the internal combustion engine to the thermostat valve, and the cooling water Connect both the bypass circulation path from the jacket through the internal combustion engine cooling heat exchanger and at least through the volume, and circulate the cooling water through the bypass circulation path when the temperature is low. A cooling water circulator configured to circulate through both the bypass circulation path and the main circulation path when rising
The internal combustion engine characterized in that the temperature sensing part in the thermostat valve is provided in a reservoir part configured to temporarily accumulate cooling water from the bypass circulation path in a valve case of the thermostat valve. Circulating device for cooling water in   2. The cooling water circulating apparatus in an internal combustion engine according to claim 1, wherein the volume portion is a vehicle interior heater.   3. The cooling water circulating apparatus for an internal combustion engine according to claim 1, wherein the reservoir is configured by providing a weir plate on an inner bottom surface of the valve case.   3. The cooling water circulation in an internal combustion engine according to claim 1, wherein the pool portion is configured by providing an outlet to the cooling water pump at a position higher than the temperature sensing portion. apparatus.

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