JPS6260916A - Evaporative cooling device for internal combustion engine - Google Patents

Abstract

PURPOSE:To enable air remained in a system to be automatically discharged by always communicating the lower part of a reservoir tank, which installed outside the cooling medium circulating system and is opened to the atomosphere, with a condenser lower tank via an auxiliary cooling medium passage. CONSTITUTION:When the vapor pressure in a system is raised by the beginning of evaporation, the air remained in the system is pushed down by the vapor of cooling medium to be gathered at the lower part of a condenser 3, and then pushed out to a reservoir tank 23 which is opened to the atomosphere. And, when the air is pushed out to a certain extent and the liquid level in the condenser 3 falls to enlarge the gaseous phase region of cooling medium at the upper part, the radiating capacity increases, the accordingly the level of liquid surface comes to settle in such a position as this radiating capacity balances with the heat generated by the engine, and the temperature in the system is maintained almost constant. Thus, the air remained in the system can be automatically discharged, and complicated control becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a boiling cooling system for an internal combustion engine IA, in which all of the liquid phase refrigerant is stored up to a predetermined level in a water jacket, and its boiling vaporization is used to cool various parts of the internal combustion engine. In particular, the present invention relates to a cooling device in which air, which is a non-condensable gas, is naturally discharged from a refrigerant circulation system during warm-up operation.

Conventional technology Boiling refrigerant as a cooling device for automatic identification engines, etc.

Various boiling cooling devices using the condensation cycle have been proposed.
ing. In this type of cooling device, the ML is also large and the electric charge is large.
And the question is whether to completely prevent that intrusion.

For example, in the device described in Japanese Patent Publication No. 47-8019, a condenser 42 is installed upright on the upper wall of a water jacket 41 as shown in FIG. flows naturally,
And the condensed liquid phase refrigerant is directly transferred to the water jacket 4.
The condenser upper tank 43 and an external refrigerant container 44 are constantly communicated through a refrigerant passage 45. That is, the friendly air remaining in the system is naturally discharged through the refrigerant passage 457, and when the internal pressure rises and liquid phase refrigerant is pushed out from the condenser 42 to the refrigerant container 44, the condenser A vapor space completely free of nitrogen is formed in the upper part of 42.

However, in such a configuration, there is a risk that the vapor flow rising from below the condenser 42 may condense within the condenser 42 and push out the droplets to the outside of the condenser 42. The amount of refrigerant held in the engine and the amount of Mi released by the condenser 42 are extremely unstable, and therefore, it cannot be used in automobile engines that require high output and stable cooling.

In response to this, the present applicant has developed a system in which the sound of the refrigerant circulation system is mainly formed in a closed loop by the water jacket, condenser, and stealth medium supply pump, and the sound of the refrigerant generated in the water jacket is
After the refrigerant is introduced into the gas condenser and condensed, the refrigerant supply pump is activated based on the output of the liquid level sensor to replenish the water jacket. The top of the system is connected to an air exhaust passage equipped with a solenoid valve, and immediately after fetal movement, etc., liquid phase refrigerant is forcibly introduced into the system from a reservoir tank outside the system using a refrigerant supply pump, and at the same time A*' is opened to remove the air remaining in the system.
0-, -'A6715''i4 publication, etc.).

Problems to be Solved by the Invention However, in the method of using a refrigerant supply pump as described above to forcefully introduce the refrigerant and exhaust all air, the flow path must be switched before and after the refrigerant supply pump. ! The multiple 4-magnetic valves that form the barrel are safe, and the 4-magnetic valve including the solenoid valve t in the air exhaust passage! Is it true? 1lIJ control had to be performed, making it difficult to simplify the device and reduce costs. Man, the system is completely liquid phase refrigerant Am 7? : When warm-up operation is performed in the n-th state, it takes a relatively long time to sufficiently warm up the cylinder wall, combustion chamber wall, etc., and rapid warm-up cannot be achieved.

Means for Solving All Problems In order to solve the above problems, the present invention provides an atmosphere that is placed outside a refrigerant circulation system consisting of a water jacket and the like at a height equal to the predetermined level of the water jacket. In addition to providing an open reservoir tank, the lower part of this reservoir tank and the condenser lower tank are always communicated through an auxiliary refrigerant passage tbP, and a one-way valve that opens when the system is under negative pressure is interposed. 9 Qi introduction passage? , connected to the top of the refrigerant circulation system.

Function: During normal operation, the refrigerant in the system is
ti1) It circulates while repeating the cycle of vaporizing and condensing in a condenser. At this time, the refrigerant liquid level in the water jacket is opened to a predetermined level and the level is raised to 7.
The refrigerant supply pump is turned on and off using the 0-passage or the liquid level switch.The liquid level is maintained at a predetermined level by appropriate liquid level regulation measures such as the 0-channel or the liquid level switch. Since the pressure inside the primary system is maintained at approximately atmospheric pressure by valving the reservoir tank, the boiling point of the refrigerant and the engine temperature are kept approximately constant.

As mentioned above, the free air initially remaining in the system where the refrigerant is boiled and condensed is naturally collected at the bottom of the condenser by the steam flow, and is pushed out from here through the auxiliary refrigerant passage 7 to steam. It is discharged outside the thread in the form of When air is discharged and the condenser has sufficient condensing capacity, the lower part of the condenser becomes a liquid phase refrigerant region, and no refrigerant vapor flows out.

Further, after the engine is stopped, the one-way valve in the air introduction passage opens due to the pressure drop in the system due to the temperature drop, and air flows into the space above the yarn. 19 The reservoir tank and lower tank are always in communication, so the refrigerant fg in the reservoir tank is in the system.
The area up to the same height as the L plane becomes the liquid phase refrigerant area, and the area above 7n is occupied by air and becomes the Afc state.

Therefore, at startup, the refrigerant liquid level in the water jacket is located near the predetermined Vpel from the beginning, and warm-up operation is performed in that state, so the amount of refrigerant to be heated is small and rapid warm-up occurs. can be realized.

Embodiment FIG. 1 shows an embodiment of the evaporative cooling device according to the present invention, which is an internal combustion engine equipped with a water jacket 2, and 3 a gas-phase refrigerant. A condenser for condensation and 4 indicate an electric refrigerant supply pump.

The water jacket 2 is formed over both the cylinder block 5 and the cylinder head 6 so as to surround the outer periphery of the cylinder and combustion chamber of the internal combustion engine 1, and the upper part, which is normally a gas phase space, is Each cylinder communicates with each other, and a steam outlet lower is provided in an upper chamber position. This steam output lower is connected to the upper part 3a of the condenser 3 through the connecting pipe 8 and the steam passage 9 (l-).
The connecting pipe 8 has a refrigerant injection part 8a which is the top part of the refrigerant circulation system and is formed in a T-shape that rises upwards. cap 10
is closed.

Specifically, at a predetermined level E1 of the primary water jacket 2, at a substantially middle height position on the cylinder head 6 side, one or a plurality of surplus refrigerant discharge ports 1) arranged at the same level are opened. There are n.

Reference numeral 12 designates a heater core for heating the vehicle compartment 14, which is connected to the water jacket 2 through all valves of the heater passage 13, and downstream thereof is a heater pump that operates in conjunction with a heater switch (not shown). 15 are provided.

The above capacitor 3 is the above population 3a? It consists of an upper tank 16, a core part 17 mainly consisting of fine tubes along the vertical direction, and a lower tank 18 that temporarily stores the n-9 liquefied refrigerant condensed by this core W517. Vehicle running style? The receiver n1 is installed at a position where it can be cooled, and is further provided with an electric cooling fan 19 for forced cooling on the front or back side thereof. One end of a refrigerant circulation passage 20 is connected to the bottom of the lower tank 18, and the other end of this refrigerant circulation passage 20 is connected to the cylinder block 5 of the water jacket 2 as a companion refrigerant inlet.
JaIC is sewn on. And the refrigerant circulation passage 2
The above-mentioned refrigerant supply pump 4 is valve-equipped in the middle part of fL.
A check valve 1 is disposed on the discharge side of the valve. still,
If the refrigerant supply pump 4 is of a type that does not allow refrigerant to flow when it is stopped, the check valve 21 can be omitted.

Further, the lower tank 18 is arranged at a relatively low position with respect to the height Itl of the surplus refrigerant discharge port 1) of the water jacket 2, and is connected to the surplus refrigerant discharge port 1) via the overflow passage 22. is connected to. The cross-sectional area of the overflow passage 22 is set so that the liquid phase refrigerant can be reliably returned even under low load when the amount of steam generated is small.

23, the above-mentioned water jacket 2 and condenser 3 are mainly closed and thrown outside the refrigerant circulation system n*.

It's a reservoir tank, and this one has a ventilation function, the B key? T: 7'2+t- valve is opened to the atmosphere, and the refrigerant liquid level inside is approximately equal to the predetermined level l of the water jacket 2, so that it is adjusted to a predetermined height position.
It is always in communication with the lower tank 1B via an auxiliary refrigerant passage 25 connected to a relatively upper portion of the lower tank 1B. In addition, the pipe portion 2 to which the cap 24 is attached
3a is provided with radiation fins 26 to suppress as much as possible the loss of steam caused when the internal liquid phase refrigerant reaches a high temperature.

One end of the air introduction passage 27 is connected to the refrigerant injection part 84 which is the top of the cooling circulation system, and the other end is connected to the pipe part 231 of the reservoir tank 23 with a hardness of 9. , and a one-way valve 28 is installed in the passage. This one-way 9P28 is usually used to introduce kaiseki! ! ? The circuit is completely closed, and is opened when the system has a negative pressure to completely allow air to be introduced from the reservoir tank 23 into the system. An air filter 29 is provided on the cap 24 of the reservoir tank 23 to filter the air introduced into the system and to separate and recover refrigerant droplets.

The above refrigerant supply pump a? The first temperature switch 30 is installed at the right position of the water jacket 2, and the first temperature switch 30 is connected to the power supply, and the cooling 7A/19 is installed in the lower tank 18, and the second temperature switch 30 is connected to the power supply. Switch 31 is completely closed and connected to the power supply. Senior self 1st. Second temperature switch 3
n, 31 r, 1. O when the temperature is above the specified temperature
The operating temperature is lower than the boiling point of the refrigerant at high altitudes and the temperature at which warm-up is considered to have been completed.
1. The temperature is set at about 83°C.

Next, the operation of the above-described cooling device will be explained.

First, when the engine is stopped, water jacket 2
The entire liquid phase refrigerant (e.g., ethyl glycol water bath liquid) occupies a predetermined level i of the cabinet, and above this level The liquid phase refrigerant remains in the reservoir tank 23 at a height 1 approximately equal to the predetermined level 1 described above. It should be noted that liquid phase refrigerant exists in the condenser 3 at a height 1 that is approximately equal to the reservoir tank 23. When the engine is started in this state, the temperature of the refrigerant in the water jacket 2 quickly rises, and eventually begins to boil. Here, the amount of refrigerant held in the water jacket 2 is very small, and the refrigerant supply pump 4 is only 1
Since the machine is kept in a stopped state at the completion temperature of 1, it receives heat intensively while remaining in the stagnation state, and rapid warm-up can be achieved.

When the refrigerant temperature in the water jacket 2 reaches a predetermined warm-up completion temperature, the refrigerant supply pump 4 starts operating from the first temperature switch 31)K, and then the lower tank 18 starts operating at the Isoseki stop 1.
A liquid phase refrigerant is supplied from the tank to the water jacket 2 in a linear manner. Then, the excess liquid phase refrigerant returns to the lower tank 18 through the overflow passage 22 valve, so the water jacket 2
The refrigerant liquid level inside is always maintained at a predetermined V-bell 1K (4'4).

- When the vapor pressure in the system increases due to the start of the rise, the free air remaining in the system is pushed by the cold V&steam and drained below the condenser 3, passing through the entire auxiliary refrigerant passage 25 to the reservoir. It is pushed out into the tank 23.

When the air is pushed out to some extent and the fitting inside the condenser 3 is lowered to expand the gas phase refrigerant area above the condenser 3, the heat dissipation capacity of the condenser 3 increases, so this heat dissipation capacity and the machine The liquid level position of the condenser 3 is fixed at the vertical position where is half-scaled, and from then on, the liquid level position of the condenser 3 naturally moves up and down depending on the load between the legs, the wind when the original is running, etc., and the system temperature? Keep the tower constant. Also, if the q air discharge inside capacitor A becomes relatively insufficient due to an increase in load, etc.
The air stagnant at the bottom of the t-th condenser 3, where the system internal pressure is high, is discharged in a straight line. Note that some refrigerant vapor flows out along with the air, but this vapor condenses in the reservoir tank 23 and is recovered.

- The cooling fan 19 starts operating when the temperature of the refrigerant in the lower tank 18 rises, and cools the condenser 3 completely.

After the engine is stopped, the pressure in the system tends to become negative as the temperature in the system decreases, but the one-way Q2 of the air introduction passage 27
8 is opened, air is introduced into the system, and n1 is prevented from becoming negative pressure. The liquid phase refrigerant in the water jacket 2 yen is prevented from flowing back into the port γ tank 1B by the action of the check valve 21.
．． At 67'h, there is a designated bell level 17cfi, and in the capacitor 3 there is a reservoir tank 23 and a fishing position 1.
This means that the liquid phase refrigerant is introduced into the stone C.

In addition, as shown by the imaginary line in the figure! A refrigerant recovery channel 32 is connected to the lower surface of the r&pipe 8, and the groove bottom is installed in the gills to recover the liquid phase refrigerant carried out along with the vapor flow and return it to the water jacket 2. The condensing performance of No. 3 can be ensured even more reliably.

Effects of the Invention As is clear from the above explanation, the evaporative cooling device for an internal combustion engine according to the present invention has the effect of causing gas to remain in the system. It can be discharged automatically in four stages, and there is no need for many electromagnetic valves or complicated controls as in the case where the refrigerant is forcibly discharged by a refrigerant supply pump.

1t% All air is introduced into the system when the engine is stopped, and the amount of refrigerant held in the water jacket is minimized when the engine is started, so rapid warm-up can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of the S-bottom showing an embodiment of the present invention, and FIG. 2 is an explanatory view of the configuration of an example of a conventional hunting confirmation device. l...Internal combustion warm-up, 2...Water jacket, 3.
...Condenser, 4...Refrigerant supply pump, 7...Steam outlet, 1) ---Refrigerant υ-outlet, 18...Lower tank, 19...Cooling fan, 20...Refrigerant Circulation passage, 21... Check valve, 22... Overflow passage, 23... Reservoir tank, 25... Auxiliary refrigerant passage, 27... Air introduction passage, 28... One-way valve ,3
0...First temperature switch, 31...Second temperature switch,

Claims (1)

[Claims] (1) A water jacket that has a vapor outlet at the top and stores liquid phase refrigerant up to a predetermined level, and the refrigerant vapor generated in this water jacket is introduced, and the condensed liquid phase refrigerant is stored in the lower tank at the bottom. a refrigerant circulation system consisting of a condenser, a refrigerant supply pump disposed between the lower tank and the water jacket and replenishing liquid phase refrigerant from the lower tank to the water jacket, and the water jacket, the condenser, and the refrigerant supply pump. a reservoir tank which is provided externally and is open to the atmosphere and located at a height substantially equal to a predetermined level of the water jacket; and an auxiliary refrigerant whose one end is connected to the lower part of the reservoir tank and the other end is connected to the lower tank. A boiling cooling device for an internal combustion engine, comprising: a passage; and an air introduction passage connected to the upper part of the refrigerant circulation system and provided with a one-way valve that opens when the system is under negative pressure.