JP3054245B2 - Reserve tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reserve tank,
In particular, the present invention relates to a reserve tank that holds cooling water for a radiator of a vehicle.

[0002]

2. Description of the Related Art Conventionally, there has been a simple closed type reserve tank having an air opening part. FIG. 3 is a sectional view of a configuration of a reserve tank disclosed in "Toyota Technical Publication No. 33 April 1989, Issue No. 3121" published by Toyota Motor Corporation as an example of a conventional reserve tank.

In FIG. 1, a cylinder 2 is provided inside a reserve tank 1, and a plurality of holes 3 are formed in a portion near the inside of a joint between the cylinder 2 and a tank body 7. The upper end of the cylinder 2 is open to a position above the Full level, and the lower end is connected to a radiator (not shown) via a hose 5. The hole 3 is formed for the case where the cooling water 4 flows to the radiator side, and the cooling water 4 flows to the radiator side through the hole 3.

[0004] In general, when the engine is in a heavy load or in a dead soak state after a high-speed operation (when the engine is stopped immediately after the load operation), cooling water containing a large amount of high-pressure steam flows from the radiator into the reserve tank.
Here, according to the reserve tank 1, most of the flowing steam is discharged to the upper end of the cylinder 2 having low resistance, and the remaining small amount of steam is discharged from the hole 3. in this way,
Since most of the water vapor is prevented from being discharged into the cooling water 4, the cooling water 4 is prevented from being pushed up by the water vapor and spouting into the atmosphere from the air opening 6.

[0005]

As described above, when the cooling water containing a large amount of high-pressure steam flows from the radiator into the reserve tank 1 at the time of a heavy load or high-speed operation of the engine in a dead soak operation, etc. Part is hole 3
Then, the water is released into the cooling water 4, and at the time of the release, the water vapor rapidly expands in the cooling water 4, so that a loud noise is generated at the hole 3. This abnormal noise is a problem because it is felt as noise by occupants inside and outside the vehicle after the engine is stopped.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a reserve tank in which abnormal noise generated when steam from a radiator is discharged into cooling water of the reserve tank is reduced. .

[0007]

To achieve the above object, the present invention provides a reserve tank in which cooling water discharged from a radiator is discharged into a submerged portion of a tank body.
A section for temporarily holding bubbles contained in the cooling water is formed around an open portion where the cooling water is discharged into the submerged portion, and the section has a space for storing bubbles at an upper portion. And a hole formed in the lower part of the space.

[0008]

In the present invention, the compartment formed around the open portion where the cooling water is discharged to the submerged portion of the reserve tank is configured to remove air bubbles contained in the cooling water discharged to the submerged portion in the upper portion of the compartment. Hold temporarily until air bubbles overflow from the space through the holes. Thus, if the bubble has a higher pressure than the pressure in the submerged portion, the compartment will gradually expand the high pressure bubble to the pressure in the submerged portion, preventing rapid expansion and pressure drop of the bubble. For this reason, the level of the abnormal noise generated when the bubbles rapidly expand in the open portion is reduced. In addition, the section formed around the open part where abnormal noise is generated cuts off the transmission path where abnormal noise is transmitted from the open part to the submerged part and transmitted to the outside, suppressing the transmission of abnormal noise to the vehicle body I do.

[0009]

1 is a sectional view showing the construction of a first embodiment of a reserve tank according to the present invention.

In FIG. 1, reference numeral 11 denotes a gas-liquid separation tube, and one end 11a is connected to a radiator (not shown) via an elbow tube 12 and a hose 13 outside the reserve tank 10. The other end 11b of the gas-liquid separation tube 11
Is opened by providing a shielding chamber 14 at a position far above the full level of the reserve tank 10. The shielding chamber 14 has a hemispherical shape, and is attached to the gas-liquid separation pipe 11 with the spherical side facing upward and the bottom side where the open hole 14 a is formed facing the liquid level of the cooling water 15. .
Therefore, the other end 11b of the gas-liquid separation tube 11 is
Opening hole 14a directed downward by being guided by the spherical inner surface of No. 4
To the cooling water 15 in the reserve tank 10.
Is open in the space 16 above.

In the vicinity of the opposite end 11a of the gas-liquid separation tube 11, when the cooling water 15 flows from the reserve tank 10 toward the radiator, the cooling water 15
Holes 17 to be sucked into are formed at four locations at 90-degree intervals. Around the gas-liquid separation tube 11 provided with the hole 17, bubble storage chambers 18 and 19 are provided in a double structure.

The bubble storage chambers 18 and 19 are provided with a common bottom plate 20.
, Cylindrical portions 18a and 19a, and top plates 18b and 19b through which the gas-liquid separation tube 11 penetrates. The bubble storage chamber 18 is provided inside the bubble storage chamber 19. As shown in FIG. 1, the cylindrical portion 18a of the inner bubble storage chamber 18 has a predetermined space for storing bubbles at the upper part of the bubble storage chamber 18 and four holes 18c at the lower part thereof.
Holes 19c are also drilled at 90-degree intervals, and four holes 19c are similarly drilled at 90-degree intervals in the cylindrical portion 19a of the outer bubble storage chamber 19. The holes 17, 18c, and 19c are arranged on the plane so as to be shifted by 45 degrees so that the positions of the holes do not match. Further, the gas-liquid separation tube 11 is provided with top plates 18b, 19b.
And the portion penetrating the bottom plate 20 have a watertight structure.

In the air bubble storage chambers 18 and 19 having the above-described structure, the bottom portion of the bottom plate 20 and the lower portion of the cylindrical portion 19b are supported by the tank main body 22 of the reserve tank 10 via the vibration isolating rubber 21. Further, a completely water-tight structure is provided between the vibration-proof rubber 21 and the bubble storage chamber 19 and between the vibration-proof rubber 21 and the tank body 22. In addition to the watertight structure of the portion penetrating the cooling water 15, the bubble storage chamber 1 of the reserve tank 10 for the cooling water 15 is provided.
Leakage from the parts provided with 8, 19 is prevented.

The tank body 22 is formed of a polypropylene resin, and holds cooling water 15. In the drawing, the FULL level and the LOW level are indices indicating an appropriate level of the liquid level 15a of the cooling water 15 when the engine is cold.
In this state, the level of the liquid level 15a is set between the FULL level and the LOW level. Therefore, the liquid level 15a of the cooling water 15 does not drop below the LOW level, and the bubble storage chambers 18 and 19 always store the cooling water 15a.
Provided inside. The level A is the maximum liquid level at which the liquid level can rise, and the shielding chamber 14 is provided at a position where the opening hole 14a is above the maximum liquid level.

In addition, the reserve tank 10 having the above-described structure
It is fixed to a fixing member 24 in the engine room via a vibration isolating rubber 23 at a location. The anti-vibration rubber 23 has a cylindrical shape,
The tank body 22 is fixed to the outer peripheral portion. A cylindrical collar 26 is provided inside the anti-vibration rubber 23, and the reserve tank 10 includes a fixing member 24 and a collar 26.
Is fixed to the fixing member 24 by inserting and tightening a bolt (not shown). In the drawing, reference numeral 25 denotes an air opening which communicates the space 16 of the reserve tank 10 with the outside.

Generally, a radiator is provided with a radiator cap. The radiator cap opens when the pressure of the cooling water system of the internal combustion engine is equal to or higher than a predetermined value, and discharges the cooling water to the reserve tank. Allow. That is, the radiator cap functions as a pressure regulating valve of the cooling water system.

Next, the operation of the reserve tank 10 of this embodiment will be described.

First, when the engine is started and the engine is operated from a cold state of the engine, the cooling water circulating in the engine and the radiator is warmed and expanded, and the pressure of the cooling water system is determined by the opening pressure of the radiator cap. When it becomes higher, the expanded cooling water flows into the reserve tank 10 from the radiator. At this time, the cooling water is supplied to the holes 17 provided in the gas-liquid separation tube 11 and the holes 18 of the bubble storage chambers 18 and 19.
c, 19c, flows into the reserve tank 10, and the level of the liquid surface 15a of the cooling water 15 rises.

At the time of a dead soak of the engine immediately after rotating the engine under a high load or at a high speed, the circulation of the cooling water in the engine is suddenly stopped. Therefore, the boiling of the cooling water particularly in a portion of the engine having a large heat input (heat spot). A large amount of water vapor is generated. Due to the generation of the water vapor, the internal pressure in the cooling water circulation path in the engine and the radiator rises, and cooling water, which is a gas-liquid mixture containing a large amount of water vapor at a high pressure, flows into the reserve tank 10. Here, most of the large amount of water vapor that has flowed into the gas-liquid separation tube 11 flows toward the end 11b of the gas-liquid separation tube 11 having low resistance, as in the conventional reserve tank 1, and the space from the open hole 14a. Opened into part 16. For this reason, also in the reserve tank 10 of the present embodiment, most of the water vapor is not discharged into the cooling water 15 as in the related art, so that the cooling water 15 is prevented from being blown into the atmosphere from the air opening 25. You.

Further, a part of the large amount of water vapor at a high pressure is
It is discharged from the hole 17 of the gas-liquid separation tube 11. Here, hole 1
7 and the hole 18c of the inner bubble storage chamber 18 are provided so as to be shifted from each other as described above, so that the steam released from the hole 17 hits the inner wall of the bubble storage chamber 18 and the bubble storage chamber 1
8 at the top. The water vapor overflowing from the upper part in the bubble storage chamber 18 is discharged from a hole 18c formed in the cylindrical portion 18b. The released water vapor is supplied to the holes 18 as described above.
The hole 19c hits the inner wall of the bubble storage chamber 19 provided at a position displaced from the hole c. Further, the water vapor overflowing from the upper part in the bubble storage chamber 19 is discharged into the cooling water 15 of the reserve tank 10 from the hole 19c.

The pressure P of the steam in the gas-liquid separation tube 11_ThreeIs
Pressure P in saab tank 10₀Is higher than
Therefore, the steam is reserved from the gas-liquid separation tube 11 as described above.
In the process of flowing into the tank 10, the steam expands
And the pressure of water vapor is P _ThreeTo P₀Down to
Therefore, the bubble storage chambers 18, 19, which are the passages of the water vapor,
The pressure P of the water vapor stored in each_Two, P₁Is P₀<
P₁<P_Two<P_ThreeIt becomes the relationship. In addition, bubble storage room 1
In 8, 19, the stored steam is cooled
Part of the water vapor is liquefied and used as a cooling water in a reserve tank
It flows out into the cooling water 15 in 10.

As described above, the steam at the high pressure P ₃ released from the hole 17 is gradually reduced to the pressure P ₀ in the reserve tank 10 as it passes through the bubble storage chambers 18 and 19, and partially reduced. Is liquefied and the amount of water vapor itself is also reduced. Accordingly, high-pressure steam is released into the reserve tank at a stretch as in the prior art, and abnormal noise generated by rapid expansion of the steam at this time is significantly reduced in the reserve tank 10 of the present embodiment.

Further, since the holes 17, 18c, 19c are staggered as described above, the air bubble storage chamber 18,
Reference numeral 19 has an effect of blocking abnormal noise generated in this embodiment. That is, the noise generated slightly in the hole 17 is blocked by the walls constituting the bubble storage chambers 18 and 19, and the noise generated slightly in the hole 18c is suppressed in the bubble storage chamber. It is shielded by the walls constituting 19. Therefore, the holes 17, 18c, 19
The transmission amount of the abnormal noise generated in the portion c through the cooling water 15 and transmitted to the outside is reduced as compared with the related art.

The gas-liquid separation tube 11 and the bubble storage chamber 1
Reference numerals 8 and 19 denote the tank body 22 with the vibration isolating rubber 21 as described above.
Therefore, most of the transmission of abnormal high-frequency vibration generated in the holes 17, 18c, and 19c to the tank body 22 is blocked by the vibration-proof rubber 21. Further, slight abnormal noise (high-frequency vibration) transmitted to the tank main body 22 through the cooling water 15 or the vibration isolating rubber 21 is applied to the fixing member 24, that is, the vehicle body by the vibration isolating rubber 23 supporting the reserve tank 10. Transmission is interrupted. As described above, the reserve tank 10 of the present embodiment is configured such that the generated abnormal noise is also blocked in the transmission path.

As described above, the level of unusual noise generated at the holes 17, 18c, and 19c is reduced as compared with the related art, and the transmission path is almost completely blocked. . For this reason, the abnormal noise felt by the occupants inside and outside the vehicle after the engine is stopped is much smaller than in the past.

Next, the gas-liquid mixture containing most of the water vapor discharged from the end 11b of the gas-liquid separation tube 11 is prevented from directly hitting the tank body 22 by the shielding chamber 14. For this reason, abnormal noise generated in the conventional reserve tank 1 due to the gas-liquid mixture hitting the tank body 7 is prevented. Here, in the reserve tank 10 of the present embodiment, although the noise is generated by the gas-liquid mixture hitting the spherical inner surface of the shielding chamber 14, the shielding chamber 14 is formed by the vibration-proof rubber 21 together with the gas-liquid separation pipe 11. Because it is attached to the main body 22 with an anti-vibration structure,
The amount of abnormal noise in the shielded room 14 transmitted to the outside of the reserve tank 10 is suppressed to a low level. As described above, according to the reserve tank 10, the abnormal noise generated in the portion where the water vapor is released into the space portion 16 can be significantly reduced as compared with the related art.

Here, if the open hole 14a of the shielding chamber 14 is submerged in the cooling water 15, a loud noise is generated when the water vapor is released from the open hole 14a. Since the opening 14 is provided above the maximum level A of the liquid surface, the opening hole 14a does not submerge, and the abnormal noise does not occur.

In the prior art, the open portion of the inner cylinder 2 is opened upward with the air opening 6, and the path from the open portion to the air opening 6 is simple and short. For this reason, the water vapor released from the open portion of the inner cylinder 2 is released to the atmosphere from the air release port 6, and there has been a problem that the cooling water is accordingly reduced. However,
According to the reserve tank 10, water vapor has a function of liquefaction by hitting the inner surface of the shielded chamber 14, and the open hole 14 a of the shielded chamber 14 faces downward on the side opposite to the atmosphere opening port 25, so that the atmosphere is reduced. The route to the open port 25 is complicated, and the amount of water vapor liquefied before reaching the atmospheric open port 25 increases. Therefore, according to the reserve tank 10 of the present embodiment, the amount of water vapor released to the atmosphere is reduced, and a decrease in cooling water can be prevented.

Further, in the reserve tank 10, the steam released from the hole 17 is gradually reduced in pressure as described above, and a part of the steam is liquefied on the way to reduce the amount of the steam itself. The effect that the cooling water 15 is agitated by the steam is reduced as compared with the related art. For this reason, in the reserve tank 10, the bubbling of the cooling water 15 is reduced, and the deterioration of the long life coolant (LLC) used as the cooling water 15 can be prevented.

FIG. 2 shows a second embodiment of the reserve tank according to the present invention.
1 shows a configuration cross-sectional view of an example.

The reserve tank 30 of this embodiment is an embodiment in which a hose 37 connected from a radiator (not shown) is connected to the gas-liquid separation tube 31 at an upper portion of the reserve tank. The gas-liquid separation tube 31 enters the tank body 38 from the upper part of the reserve tank 30 and extends downward,
A shield chamber 33 having the same structure as that of the first embodiment is provided at a position below the OW level, turned 180 degrees and extends upward, and at a position above the maximum level B of the cooling water 32.

At the turn-back portion 31a of the gas-liquid separation tube 31,
Holes 34 for sucking the cooling water 32 are formed at four locations at intervals of 90 degrees, and bubble storage chambers 35 and 36 are formed around the holes 34. The bubble storage chambers 35 and 36 are all located at the lower part of the LOW level, and the bubble storage chambers 35 and 36
Holes 35c, 36c are formed in side walls 35a, 36a constituting
As in the first embodiment, four holes are formed at different positions on a plane. As described above, the peripheral portion of the hole 34 in the second embodiment has the completely same configuration as that of the first embodiment, so that the level of the abnormal noise generated in the portions of the holes 34, 35c, and 36c is equal to that of the first embodiment. As in the case of the embodiment, by the action of the bubble storage chambers 35 and 36, the number is significantly reduced as compared with the conventional case.

An opening 38a is provided in an upper portion of the tank body 38, and a cap 39 is mounted on the opening 38a via a vibration-proof rubber 40. The upper portion of the gas-liquid separation tube 31 and the air opening 41 are formed integrally with the cap 39. Therefore, between the tank main body 38, the gas-liquid separation tube 31 provided with the shielding chamber 33, and the bubble storage chambers 35 and 36, the transmission of vibration is interrupted by the vibration-proof rubber 40. For this reason,
Also in the reserve tank 30 of the present embodiment, transmission of abnormal noise (high-frequency vibration) generated in each of the gas-liquid separation pipe 31, the shielding chamber 33, and the bubble storage chambers 35 and 36 to the tank main body 38 is the same as in the first embodiment. It is similarly suppressed.

The reserve tank 30 is provided with a vibration isolating rubber 42.
The vibration transmitted to the tank main body 38 is fixed to the fixing member 43 through the fixing member 43 as in the first embodiment.
That is, transmission to the vehicle body is suppressed.

As described above, also by the reserve tank 30 of the second embodiment, by the same operation as that of the first embodiment,
The level of the abnormal noise generated in the holes 34, 35c, and 36c is reduced as compared with the related art, and almost all of the noise is blocked in the transmission path of the abnormal noise. As a result, also in the second embodiment, the noise from the reserve tank felt by the occupant in the vehicle after the engine is stopped can be significantly reduced as compared with the related art. In addition, the problem of abnormal noise caused by the water vapor released to the space portion 44 or the problem described in the first embodiment in which the water vapor released to the space portion 44 is released to the atmosphere and the amount of cooling water is reduced is also the first problem. By the same operation as in the embodiment, it can be improved as compared with the related art.

Further, according to the reserve tank 30 of the second embodiment, an opening for providing the gas-liquid separation pipe 11 and the bubble storage chambers 18 and 19 is required at the bottom of the tank body 38 as in the first embodiment. do not do. Therefore, the possibility of leakage of the cooling water at the opening of the first embodiment can be completely eliminated in the reserve tank 30.

In the first and second embodiments, the double bubble storage chambers 18 and 19 and the bubble storage chamber 3 are used.
Although the configuration in which the holes 5 and 36 are formed around the holes 17 and 34 is shown, the present invention is not limited to the above embodiment.
Even in a single bubble storage chamber, the above-mentioned effects can be sufficiently obtained. In addition, if three or more air bubble storage chambers are formed, the above-described effects are more effectively exerted. Further, since the bubble storage chamber only needs to be able to store bubbles, it is not necessary to form a complete compartment as in the above embodiment, and the bottom plate constituting the bubble storage chambers 18, 19, 35, 36 in the above embodiment is omitted. It is possible. In this case, if the air bubbles are discharged from the lower end of the side wall of the air bubble storage chamber into the outer air bubble storage chamber or the cooling water, the holes 18c, 19c,
There is no need to provide 35c and 36c, and the structure of the reserve tank according to the present invention can be simplified.

[0038]

As described above, according to the present invention, rapid expansion of bubbles is prevented, so that the level of abnormal noise generated when bubbles from the radiator are released into the cooling water of the reserve tank is reduced. Reduced. Further, since the section blocks the transmission path through which the abnormal noise is transmitted from the open portion to the submerged portion and transmitted to the outside, transmission of the abnormal noise to the vehicle body is suppressed. As a result, when cooling water containing a large amount of high-pressure water vapor flows into the reserve tank from the radiator during high engine load or dead soak after high-speed operation, the noise from the reserve tank perceived by the occupant in the vehicle is reduced. It can be made much smaller than.

[Brief description of the drawings]

FIG. 1 is a sectional view of a configuration of a first embodiment of a reserve tank according to the present invention.

FIG. 2 is a sectional view showing the configuration of a second embodiment of the reserve tank according to the present invention.

FIG. 3 is a cross-sectional view of an example of a conventional reserve tank.

[Explanation of symbols]

 10, 30 Reserve tank 11, 31 Gas-liquid separation tube 13, 37 Hose 14, 33 Shielding chamber 14a Opening hole 15, 32 Cooling water 15a Liquid level 16, 44 Space part 17, 18c, 19c, 34, 35c, 36c Hole 18 , 19,35,36 Bubble storage chamber 18a, 19a Cylindrical part 18b, 19b Top plate 20 Bottom plate 21,23,40,42 Anti-vibration rubber 22,38 Tank body 25,41 Atmospheric opening 35a, 36a Side wall 39 Cap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho-62-175225 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01P 11/00 F01P 11/02

Claims (1)

(57) [Claims] 1. A reserve tank in which cooling water discharged from a radiator is discharged to a submerged portion of a tank body , wherein the cooling water is contained in the cooling water around an open portion discharged to the submerged portion. Forming a compartment for temporarily holding the bubbles to be generated, the compartment having an empty space for storing the bubbles at the top.
A reserve tank comprising a hole formed between the space and a lower portion of the space .