JP2938335B2 - Radiator 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 water-cooled radiator for cooling an engine. More particularly, the present invention relates to a tank attached to an upper portion and a lower portion of a radiator core.

[0002]

2. Description of the Related Art A radiator of this type is provided with an upper tank and a lower tank made of a synthetic resin at the upper and lower parts of a radiator core composed of a number of tubes having fins fixed to the outer peripheral surface. A cooling water introduction hole and a cooling water discharge hole are formed on each side wall of the upper tank and the lower tank, and a corner portion of the upper tank is formed so as to be inclined so that the volume decreases toward the tank end. Since these tanks are formed by molding a synthetic resin with a metal mold, if they warp or sink after molding, they cannot be assembled integrally with the radiator core. For this reason, many rows of reinforcing beads are provided on the entire side walls and top wall inside these tanks. However, these multiple rows of reinforcing beads hindered the flow of cooling water inside the tank, increasing the water-side pressure loss of the radiator. For this reason, attempts have been made to increase the wall thickness of the tank itself without providing reinforcing beads inside the upper tank 1 and the lower tank 2 as shown in FIGS. In these figures, 1a is a cooling water introduction hole, 2a is a cooling water discharge hole, 1b is a cooling water introduction pipe,
2b is a cooling water discharge pipe, 1e is a tank end of a corner portion of the upper tank 1, 1f is a top surface thereof, and 1g is an inner surface of the corner portion.

[0003]

Although the cooling water flows smoothly in the upper tank 1 and the lower tank 2 without reinforcing beads shown in FIGS. 11, 12 and 16, the cooling water introduction hole in the upper tank 1 as shown in FIG. A separation vortex P separated from the edge of the hole 1a is formed on the inner surface of the tank side wall near 1a. In the lower tank 2, as shown in FIG. 12, a separated vortex Q separated from the edge of the cooling water discharge hole 2a is formed on the inner surface of the cooling water discharge pipe. Further, as shown in FIG. 16, the cooling water forms a vortex R at a portion where the top surface 1f of the upper tank 1 and the corner inner surface 1g intersect.

[0004] These vortices P, Q and R each narrow the effective flow path inside the tank and increase the resistance of the cooling water to flow. As a result, the water-side pressure loss of the radiator is increased, the cooling water amount is reduced, and problems such as deterioration of heat radiation performance and corrosion of the water pump due to cavitation occur.
SUMMARY OF THE INVENTION An object of the present invention is to provide a radiator tank capable of suppressing the generation of a vortex inside the tank, reducing the water-side pressure loss of the radiator, and increasing the amount of cooling water.

[0005]

In order to achieve the above object, two configurations of the present invention will be described with reference to the drawings corresponding to the embodiments. First, as shown in FIGS. 1, 6 and 7, an upper tank 11 and a lower tank 12 are respectively provided at an upper portion and a lower portion of a radiator core 10a, and a cooling water introduction hole is provided at each side wall of the upper tank 11 and the lower tank 12. This is an improvement of the radiator 10 in which the cooling water introduction pipe 11b and the cooling water discharge pipe 12b are formed integrally with the cooling water introduction hole 11a and the cooling water discharge hole 12a, respectively. The characteristic configuration is such that a plurality of rows of ribs 11c, 12c extending in a direction substantially perpendicular to the direction in which the cooling water flows on the inner surface of the side wall near one or both of the cooling water introduction hole 11a and the cooling water discharge hole 12a. It is where it was formed.

A second aspect of the present invention is that, as shown in FIG. 13, an upper tank 11 is provided above a radiator core 10a, and a corner of the upper tank 11 has a tank end 11e.
This is an improvement of the radiator 10 which is formed so as to be inclined so that the volume becomes smaller as it goes toward.

The characteristic configuration is such that a plurality of rows of ribs 11d extending in a direction substantially perpendicular to the direction in which the cooling water flows are formed on one or both of the inclined inner surface 11g and the tank top surface 11f following the inner surface. There.

[0008]

In the upper tank 11, the cooling water flowing along the inner surface of the side wall of the tank is turbulent due to the plurality of rows of ribs 11c, and the separation vortex P is greatly reduced. In the lower tank 12, the turbulent flow of the cooling water flowing along the inner surface of the tank side wall is caused by the plurality of rows of ribs 12c, and the separation vortex Q inside the discharge pipe 12b is significantly reduced. In the corner portion of the upper tank 11, the cooling water flowing along the inner surface of the corner portion is caused by a plurality of rows of ribs 11d provided on the inclined inner surface 11g of the corner portion, so that the vortex R is greatly reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 3 and FIGS. 6 to 8 show a radiator tank according to a first embodiment of the present invention. In this example, the radiator 10 is used for a vehicle engine. The radiator 10 includes a radiator core 10a and an upper tank 11 and a lower tank 12 bonded to the upper and lower portions, respectively. The radiator core 10a has a large number of tubes 10b.
And a number of fins 10c. The upper tank 11 and the lower tank 12 are made by molding a synthetic resin with a mold. Cooling water introduction holes 11a and cooling water discharge holes 12a for introducing or discharging cooling water are formed on one side wall in the longitudinal direction of the upper tank 11 and the lower tank 12, respectively. The cooling water introduction holes are formed on the side walls so as to communicate with these holes. The pipe 11b and the cooling water discharge pipe 12b are formed integrally.

A plurality of rows of ribs 11C, 12C are provided on the inner walls of the tanks 11, 12 in the vicinity of the cooling water introduction hole 11a and the cooling water discharge hole 12a in the longitudinal direction of the tank, that is, the direction orthogonal to the direction in which the cooling water flows. And are integrally formed at intervals. In this example, the ribs 11c and 12c are 7
The ribs are formed so as to be parallel to each other on the row straight line and to have a height of the rib that decreases as the distance from the hole increases.

In the radiator upper tank 11 configured as described above, first, as shown in FIG.
The cooling water introduced from 1b is separated at the edge of the cooling water introduction hole 11a, and a separated vortex P is generated near the hole edge in the longitudinal direction of the tank. However, the water flow directed to the holes 11a along the inner surface of the tank side wall that creates the vortex P is disturbed by the seven rows of ribs 11c being sequentially higher, and dissipates the vortex generation energy. As a result, the vortex P becomes smaller, and the conventional flow path width L shown in FIG.
₀ passage width L ₁ as shown in FIG. 1 as compared to the extremely large.

Next, in the lower tank 12, as shown in FIG. 7, the cooling water discharged from the cooling water discharge pipe 12b is separated at the edge of the cooling water discharge hole 12a, and a separated vortex Q is generated inside the discharge pipe 12b. . However, the water flow toward the holes 12a along the inner surface of the tank side wall is disturbed because the seven rows of ribs 12c are sequentially increased, and the flow velocity is reduced as the water flow approaches the holes 12a. Consequently vortex Q becomes small, the passage width Y ₁ as shown in FIG. 7 as compared with the conventional channel width Y ₀ shown in FIG. 12 becomes extremely large. As the flow path widths L ₁ and Y ₁ increase, the flow rate of the cooling water increases.

The shapes of the ribs shown in the above embodiment are merely examples. In order to efficiently suppress the eddy current, the ribs are formed in an arc shape as shown in FIGS. 4 and 9, or as shown in FIGS. 5 and 10. The positions may be shifted for each row. The number of ribs is not limited to seven, but may be two to six or eight to twelve.
The number of rows is appropriately determined according to the spacing and height of the ribs. Further, in the above embodiment, the ribs in a plurality of rows are formed so that the heights of the ribs decrease as the distance from the edge of the hole increases, but all ribs may have the same height. Further, in the above embodiment, the ribs 11 are provided on both the upper tank 11 and the lower tank 12.
Although c and 12c were formed, only one of them may be formed.

FIGS. 13 and 14 show a second embodiment of the present invention. In both figures, the same symbols as those in FIG. 1 indicate the same components. An upper tank 11 made by molding a synthetic resin with a mold is adhered to the upper part of the radiator core 10a. The upper tank 11 is formed so as to be inclined such that the volume becomes smaller as the corner portion becomes closer to the tank end portion 11e. A plurality of ribs 11 are provided on the inclined inner surface 11g and the tank top surface 11f following the inner surface in the longitudinal direction of the tank, that is, in a direction substantially perpendicular to the direction in which the cooling water flows.
d are integrally formed at predetermined intervals. In this example, the ribs 11d are formed so as to be parallel to each other on a five-row straight line and so that the height of the ribs increases as approaching the tank end 11e.

The operation of the radiator tank thus configured will be described. As shown in FIG.
The cooling water introduced from 1b is inclined such that the volume of the cooling water becomes smaller as the corner portion of the upper tank 11 becomes closer to the tank end portion 11e, so that the inclined inner surface 11g and the vicinity of the tank top surface 11f following this inner surface are not provided. A vortex R is generated. However, along the tank top surface 11f, the tank end 1
The flow velocity 1e is disturbed because the five rows of ribs 11d are sequentially increased, and the vortex generation energy is dissipated. As a result, the vortex R becomes smaller and the vortex R becomes smaller as compared with the conventional flow path width X ₀ shown in FIG.
As shown in ( ₁₎ , the flow path width X1 becomes extremely large, and the flow rate of the cooling water increases.

The shape of the ribs shown in the above embodiment is merely an example, and the ribs may be arranged so as to be shifted from each other as shown in FIG. Also,
The number of ribs is not limited to five, but may be two to four or six to twelve. The number of rows is appropriately determined according to the spacing and height of the ribs. In the above embodiment, a plurality of rows of ribs
Although the ribs are formed so as to increase in height as approaching 1e, all the ribs may have the same height. Also,
In the above example, the ribs 11d are formed on both the tank top surface 11f and the corner inner surface 11g, but only one of them may be provided. Furthermore, although the first and second embodiments have described the upper tank 11 and the lower tank 12 made of synthetic resin, the material of the upper tank 11 and the lower tank 12 is not limited to this, and may be metal.

[0017]

As described above, according to the present invention, the longitudinal direction of the tank, that is, the direction in which the cooling water flows, is located near one or both of the cooling water introduction hole and the cooling water discharge hole on the side wall of each tank. Since a plurality of rows of ribs are integrally formed at predetermined intervals in a direction perpendicular to the direction, the water flow generating the vortex is turbulent between the ribs, and the vortex is greatly reduced. Also, if multiple rows of ribs are integrally formed on one or both of the inclined inner surface of the upper tank and the tank top surface following this inner surface, the vortex generated at each corner inside the tank can be similarly reduced. Can be. By reducing the vortex in the upper tank or the lower tank, the flow resistance of the cooling water can be reduced. As a result, the water-side pressure loss of the radiator can be reduced and the amount of cooling water can be increased, and problems such as corrosion of the water pump due to cavitation can be avoided. Further, even if the thickness of the ribs is reduced, no warping or sinking occurs in the molding even if the wall thickness is reduced, so that the production cost of the tank does not increase.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 6, showing an upper tank according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the tank.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a view corresponding to FIG. 3, showing another shape of the rib of the upper tank according to the first embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 3 and showing still another shape of the rib of the upper tank according to the first embodiment of the present invention.

FIG. 6 is an assembled perspective view of the radiator according to the embodiment of the present invention.

FIG. 7C shows a lower tank according to the first embodiment of the present invention;
-C sectional drawing.

FIG. 8 is a sectional view taken along line DD of FIG. 7;

FIG. 9 is a view corresponding to FIG. 8, showing another shape of the rib of the lower tank according to the first embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 8 and showing still another shape of the rib of the lower tank according to the first embodiment of the present invention.

FIG. 11 is a diagram corresponding to FIG. 1 showing a conventional example.

FIG. 12 is a diagram corresponding to FIG. 7 showing a conventional example.

FIG. 13 shows an upper tank according to a second embodiment of the present invention.
Sectional view taken along the line EE of FIG.

FIG. 14 is a perspective view thereof.

FIG. 15 is a view showing another shape of the rib as viewed in the direction of arrow F in FIG. 14;

FIG. 16 is a diagram corresponding to FIG. 13 showing a conventional example.

[Explanation of symbols]

 Reference Signs List 10 radiator 10a radiator core 11 upper tank 11a cooling water introduction hole 11b cooling water introduction pipe 11c, 11d, 12c rib 11e tank end 11f tank top surface 11g corner inner surface 12 lower tank 12a cooling water discharge hole 12b cooling water discharge tube

Claims (7)

(57) [Claims] An upper tank (11) and a lower tank (12) are provided at an upper portion and a lower portion of a radiator core (10a), respectively. ) And a cooling water discharge hole (12a) are formed, and a cooling water introduction pipe (11b) and a cooling water discharge pipe (12b) are integrally formed with the cooling water introduction hole (11a) and the cooling water discharge hole (12a), respectively. In the formed radiator (10), a direction substantially orthogonal to the direction in which the cooling water flows on the inner surface of the side wall near one or both of the cooling water introduction holes (11a) and the cooling water discharge holes (12a). A radiator tank characterized in that a plurality of rows of ribs (11c, 12c) extending in a row are formed. 2. A cooling water introduction hole (11a) and a cooling water discharge hole (12).
The radiator tank according to claim 1, wherein a) is a circular hole, and a plurality of rows of ribs (11c, 12c) are formed in an arc shape. 3. The radiator tank according to claim 1, wherein the plurality of rows of ribs (11c, 12c) are formed such that the height of the ribs decreases as the distance from the edge of the hole increases. 4. The radiator tank according to claim 1, wherein a plurality of rows of ribs (11c, 12c) are formed so as to be shifted in position for each row. 5. An upper tank (11) is provided on an upper portion of the radiator core (10a), and a corner of the upper tank (11) is formed so as to be inclined so that a volume decreases toward a tank end (11e). In the radiator (10), a rib (11d) extending in a direction substantially perpendicular to the direction in which the cooling water flows is provided on one or both of the inclined inner surface (11g) and the tank top surface (11f) following the inner surface. A radiator tank formed in a plurality of rows. 6. The radiator tank according to claim 5, wherein the plurality of rows of ribs (11d) are formed so that the height of the ribs increases as approaching the tank end (11e). 7. The radiator tank according to claim 5, wherein a plurality of rows of ribs (11d) are formed so as to be shifted in position for each row.