JP3867607B2 - Fully sealed reserve tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a completely sealed reserve tank that absorbs changes in the amount of cooling water in a radiator and forms a sealed space communicating with the inside of the radiator, and is effective when applied to a cooling device for a heat engine such as an internal combustion engine. It is.
[0002]
[Prior art and problems to be solved by the invention]
A well-sealed reserve tank, as is well known, constitutes an air reservoir chamber sealed in the reserve tank by sealing the water inlet of the reserve tank with a pressurized cap, and this air reservoir chamber is cooled. It functions as a shock absorber (air spring) that absorbs the volume change of the cooling water accompanying the temperature change of the water, particularly the expansion change.
[0003]
However, when replenishing the cooling water to the reserve tank, if the cooling water is replenished more than necessary, the volume of the air reservoir chamber that forms the shock absorber will be smaller than the specified value, so that the volume expansion can be absorbed sufficiently. As a result, the system pressure may increase, cracks may occur in the parts such as the reserve tank and the engine, and the hose may come off.
[0004]
Therefore, in the past, in order to prevent this problem, the reserve tank was thickened to ensure sufficient pressure resistance, so the reserve tank was heavy and it was difficult to reduce manufacturing costs. there were.
[0005]
In view of the above points, the present invention has as its first object to provide a completely sealed reserve tank having a novel structure different from the conventional one, and reduces the influence of the amount of cooling water to be replenished, resulting in a change in the temperature of the cooling water. The second problem is to sufficiently absorb the volume change of the cooling water.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a fully-sealed reserve tank that absorbs a change in the amount of cooling water in the radiator and constitutes a sealed space communicating with the inside of the radiator. The tank body (31) in which the cooling water is stored is partitioned into at least two spaces (30a, 30b) in the horizontal direction by partition walls (32) extending in the vertical direction. 30a, 30b), the first space (30a) on one side communicates with the water inlet (34) side on the upper side, and the second space (30b) on the other side is formed below the liquid level. It is characterized by communicating with the first space (30a) only through the communication port (32a).
[0007]
As a result, a reserve tank having a new structure different from the conventional one can be obtained, and the space above the liquid surface in the second space (30b) is completely sealed, and this space serves as a buffer. It becomes an air reservoir.
[0008]
Accordingly, since the air reservoir chamber is configured regardless of the amount of cooling to be replenished, the volume change of the cooling water can be sufficiently absorbed.
[0009]
In the second aspect of the present invention, a tank body (31) is a fully sealed reserve tank that absorbs a change in the amount of cooling water in the radiator and forms a sealed space communicating with the inside of the radiator. ) Is housed in an elastically deformable gas container (36) sealed with a gas.
[0010]
As a result, a reserve tank having a new structure different from the conventional one can be obtained, and the gas container (36) functions as an air reservoir chamber. Therefore, an air reservoir chamber having a predetermined volume can be provided regardless of the amount of cooling water to be replenished. Even if it is a case where cooling water is replenished excessively, the volume change of cooling water can fully be absorbed.
[0011]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
In the present embodiment, the present invention is applied to a cooling device for a vehicle running engine, and FIG. 1 is a schematic diagram of the cooling device.
[0013]
The engine 10 is an internal combustion engine that burns fuel to generate mechanical power, and the radiator 20 is a heat exchanger that cools the cooling water by exchanging heat between cooling water that has cooled the engine 10 and air.
[0014]
The thermostat 21 is a temperature type flow rate adjustment valve that adjusts the flow rate of the bypass circuit 22 that flows the cooling water by bypassing the radiator 20 and the flow rate that flows to the radiator 20 so that the temperature of the engine 10 falls within a predetermined temperature range. The water pump 11 obtains power from the engine 10 and circulates cooling water.
[0015]
The reserve tank 30 is a completely sealed tank means that absorbs a change in the amount of cooling water in the radiator 20 and constitutes a sealed space that communicates with the radiator 20.
[0016]
As shown in FIG. 2, the reserve tank 30 has three spaces 30a, 30b, 3b in the horizontal direction by two partition walls 32, 33 extending in the vertical direction in the tank body 31 in which cooling water is stored. Of the three spaces 30a, 30b, 30c, the first space 30a at the center of the paper surface communicates with the water inlet 34 side on the upper side, and the second space 30b on the left side of the paper surface is The partition wall 32 communicates with the first space 30a only by the communication port 32a formed on the lower side of the liquid surface, and the third space 30c on the right side of the page is connected to the communication ports 33a formed on both upper and lower sides of the partition wall 33. And communicated with the first space 30a.
[0017]
The water injection port 34 is sealed with a pressure-type cap (not shown), and the tank body 31 is in a state of being pressure-isolated from the atmosphere side by the cap, and above the third space 30c. Is provided with a connecting portion 35 for connecting a pipe connected to the radiator 20.
[0018]
The tank body 31 is formed by welding first and second tank bodies 31a and 31b made of resin.
[0019]
Next, the effect of this embodiment is described.
[0020]
Since the second space 30b communicates with the first space 30a only through the communication port 32a formed below the liquid level, the space above the liquid level in the second space 30b is completely sealed. It becomes. Since this space is reliably formed regardless of the amount of cooling to be replenished, this space can be made to function as an air reservoir chamber 30d serving as a shock absorber.
[0021]
At this time, even when the cooling water is replenished into the reserve tank 30 to such an extent that the cooling water overflows from the water injection port 34, the volume of the air reservoir chamber can sufficiently absorb the volume change of the cooling water. If the size of the second space 30b is selected so as to be secured to 30d, even if the cooling water is excessively supplemented, the volume change of the cooling water can be sufficiently absorbed. .
[0022]
Accordingly, it is possible to prevent problems such as an increase in the system pressure, cracks in the parts such as the reserve tank 30 and the engine, and the disconnection of the hose, thereby reducing the thickness of the tank body 31 and reducing the weight. The manufacturing cost of the reserve tank 30 can be reduced.
[0023]
Incidentally, conventionally, since all of the first to third spaces 30a to 30c communicated on both the upper and lower sides, when the cooling water is replenished into the reserve tank 30 to the extent that the cooling water overflows from the water injection port 34, all The air layer disappeared from the spaces 30a to 30c, and the above-described problem occurred.
[0024]
Further, even if the cooling water is replenished into the reserve tank 30 to the extent that the cooling water overflows from the water inlet 34, the air reservoir chamber 30d having a predetermined volume can be provided with certainty, so that the upper surface 34a of the water inlet 34 is provided. When the cooling water is replenished up to the upper surface 34a of the water injection port 34 when it is made to coincide with the upper limit position of the radiator 20 and the cooling water is replenished, the user replenishes the replenishment amount when replenishing the cooling water. Such an error can be prevented in advance.
[0025]
(Second Embodiment)
In the first embodiment, the air reservoir chamber 30d is configured using the tank body 31 and the partition wall 32. However, as shown in FIG. 3, this embodiment is an elastically deformable gas container in which a gas is sealed. A rubber ball 36 forming the following is housed in the tank body 31.
[0026]
Thereby, since the ball 36 functions as the air reservoir chamber 30d, the air reservoir chamber 30d having a predetermined volume can be reliably provided regardless of the amount of cooling water to be replenished. Even so, the volume change of the cooling water can be sufficiently absorbed.
[0027]
In the present embodiment, the balls 36 are housed in a tank body 31 having a structure similar to the conventional structure in which all of the first to third spaces 30a to 30c communicate with each other on the upper and lower sides. In this embodiment, air is enclosed in the ball 36, but an inert gas such as nitrogen gas may be enclosed. Furthermore, the material of the ball 36 is not limited to rubber.
[0028]
(Other embodiments)
The present invention solves the above-mentioned problem by constructing in the tank body 31 a sealed air reservoir chamber 30d that does not communicate with at least the atmosphere side when the water injection port 34 is closed. The means is not limited to the structure shown in the above embodiment.
[0029]
In the above-described embodiment, the present invention is applied to a vehicle cooling device, but the application of the present invention is not limited to this.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a cooling device according to an embodiment of the present invention.
FIG. 2 is a schematic view of a reserve tank according to the first embodiment of the present invention.
FIG. 3 is a schematic diagram of a reserve tank according to a second embodiment of the present invention.
[Explanation of symbols]
30 ... Reserve tank, 31 ... Tank body, 32, 33 ... Partition wall,
32a, 33a ... communication port, 34 ... water injection port.

Claims (2)

A fully-sealed reserve tank that absorbs changes in the amount of cooling water in the radiator and forms a sealed space communicating with the radiator,
The tank body (31) in which the cooling water is stored is partitioned into at least two spaces (30a, 30b) in the horizontal direction by a partition wall (32) extending in the vertical direction.
Further, of the two spaces (30a, 30b), the first space (30a) on one side communicates with the water inlet (34) side on the upper side, and the second space (30b) on the other side is the liquid level. A fully-sealed reserve tank characterized in that it communicates with the first space (30a) only through a communication port (32a) formed on the lower side. A fully-sealed reserve tank that absorbs changes in the amount of cooling water in the radiator and forms a sealed space communicating with the radiator,
A fully-sealed reserve tank characterized in that an elastically deformable gas container (36) sealed with gas is housed in a tank body (31) in which cooling water is stored.

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