JP2019190792A - Radiator - Google Patents

Abstract

To prevent a heat exchange unit from being cracked by a thermal expansion difference caused by a coolant intensively flowing only to tubes near an inlet pipe with a simple structure in a radiator which is formed with a number of tubes connected to an upper tank.SOLUTION: Coolant outlet holes 15a, 15b partitioned by an upper wall 17 and a bottom wall 18 are formed at a discharge part 14 of an inlet pipe 8 which enters into an interior of an upper tank 1. A coolant moving straight ahead on the inlet pipe 8 is scattered in a lateral direction without flowing downward. Thus, the coolant dispersedly flows at the interior of the upper tank 1 to make a water temperature to be uniformized at the interior of the upper tank 1. As a result, cracks are prevented from being caused in a heat exchange unit by a thermal expansion difference.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a radiator used in an internal combustion engine for a vehicle or the like.

  The radiator includes an inlet tank, an outlet tank, and a heat exchange unit, and is roughly classified into a type in which the inlet tank and the outlet tank are arranged vertically and a type in which the tank is arranged on the left and right.

  In the type in which the inlet tank and outlet tank are arranged vertically and the inlet tank is formed as an upper tank and the outlet tank is formed as a lower tank, an inlet pipe is provided on the upper surface of the upper tank as a method for flowing cooling water to the upper tank. The cooling water flows into the upper tank from above (for example, Patent Document 1), the inlet pipe is provided on one longitudinal side surface of the upper tank, and the cooling water flows into the upper tank from the horizontal direction (for example, Patent Document 2). It is divided roughly into.

  As in Patent Document 2, in the method in which the cooling water flows into the upper tank from the horizontal direction, the height of the radiator can be suppressed, so that an arrangement space can be reduced. In particular, in an automobile, in a type in which a radiator is suspended by a radiator support, it is troublesome to arrange the inlet pipe upward, and it is reasonable to attach the inlet pipe to one longitudinal side surface of the upper tank.

Japanese Utility Model 54-156273 microfilm Japanese Patent Laid-Open No. 2002-4858

  Now, the heat exchange unit of the radiator includes a large number of tubes through which cooling water flows, and radiating fins bent in a zigzag are arranged between adjacent tubes. The tubes and fins are usually made of aluminum in terms of heat dissipation and light weight. On the other hand, in the upper tank type radiator, the cooling water cooling port is connected to one end and the other end of the upper tank. Although arranged in between, the cooling water flowing into the upper tank intensively flows into the tube group near the inlet pipe, and there is a phenomenon in which a difference in thermal expansion occurs in the tube group.

  In other words, in the tube close to the inlet pipe, the cooling performance is poor because the high-temperature cooling water flows in intensively.Therefore, the tube has a large thermal expansion, but the tube that is far away from the inlet pipe moves slowly in the upper tank. Therefore, the cooling water is cooled, and the cooling performance is high.Therefore, the thermal expansion of the tube is small, and this difference in thermal expansion causes distortion in the heat exchange unit. As a result, cracks may occur in certain tubes. In addition, since the entire tube is not effectively used, there is a fear that the cooling performance of the entire radiator is lowered.

  This difference in thermal expansion is caused by the fact that the cooling water does not flow evenly in the upper tank, or if the cooling water level inside the upper tank is lowered, the cooling water discharged from the inlet pipe Flowed down and hardly dispersed, so the difference in thermal expansion was noticeable.

  The present invention has been made to improve such a phenomenon.

The present invention includes various structures, typical examples of which are specified in the claims. Of these, in the invention of claim 1,
“An upper tank having a long side plate and a long side plate that are elongated in the horizontal direction and in a substantially vertical position, and an inlet pipe that feeds cooling water into the upper tank from a middle portion between one end and the other end of the long side plate. The inlet pipe has a discharge part that enters the inside of the upper tank. ''
In the basic configuration
“A cooling water outlet hole is formed in the discharge portion of the inlet pipe to flow the cooling water in the left-right direction as viewed from the axial direction of the inlet pipe.”
The structure is added.

The invention of claim 2 is a development example of claim 1, and in this invention,
“The cooling water outlet holes are provided in a pair on the left and right with the axis of the inlet pipe interposed therebetween, and are opened obliquely upward as viewed from the axial direction of the inlet pipe.”
It is the composition.

The invention of claim 3 is the invention according to claim 1 or 2,
“The tip of the discharge part is provided with a tip wall continuous with the bottom surface of the discharge part, and an auxiliary outlet hole is provided in the tip wall”
It is the composition.

Invention of Claim 4 in any one of Claims 1-3,
“The inlet pipe is made of synthetic resin, and the discharge portion has a bottom wall whose inner peripheral surface is formed in an arc surface concentric with the axis of the inlet pipe.”
It is the composition.

  In the present invention, when the cooling water flows into the upper tank from the inlet pipe, the cooling water flows in a directionally imparted direction so as to go in the direction of one end of the upper tank and the direction of the other end. ) Therefore, even if the water level inside the upper tank is low, the phenomenon of simply flowing down does not occur, and the water can be widely dispersed over the entire length of the upper tank.

  Therefore, the temperature of the cooling water flowing into each tube can be made uniform, and the occurrence of a difference in thermal expansion between the tubes can be prevented or greatly suppressed to be within an allowable range. As a result, it is possible to prevent the heat exchange unit from being distorted and to prevent the heat exchange unit from cracking. Moreover, since the whole group of tubes can be effectively used for heat exchange, the efficiency of heat exchange can also be improved. Furthermore, since the shape of the inlet pipe is devised and no other members are required, an increase in cost can be prevented.

  As described above, even if the water level in the upper tank is low, the cooling water can be diverted in such a manner that it is blown in the left-right direction, and therefore it can be said to be particularly beneficial when the amount of cooling water is reduced.

  Although various modes can be adopted for the cooling water outlet hole of the inlet pipe, providing a pair of cooling water outlet holes on the left and right sides and opening them obliquely upward as in claim 2 can ensure the provision of directionality to the cooling water. Since the cooling water can be blown far away, the dispersibility of the cooling water in the upper tank can be further improved.

  In addition, if the position of the inlet pipe is deviated from the left and right middle point of the upper tank, the volume of the upper tank is different on the left and right sides across the inlet pipe. Although it is necessary, if the left and right cooling discharge portions are provided, the left and right cooling discharge portions can be easily adjusted by changing the opening areas of the left and right cooling discharge portions.

  The many tubes that make up the heat exchange unit have a flat shape that is long in the width direction of the upper tank in plan view, but it does not spread over the entire front and rear width of the upper tank. There is usually a slight gap between the tube and the ends of the tube. Accordingly, a portion along the other longitudinal side plate of the lower surface of the upper tank is a non-communication area where the tube group is not open.

  In the invention of claim 3, since the auxiliary outlet hole is provided in the tip wall of the inlet pipe, a part of the cooling water is discharged from the auxiliary outlet hole toward the rear wall of the upper tank and discharged from the auxiliary outlet. The cooling water flows in the left-right direction along the non-communication area. Thereby, the dispersion | distribution function of cooling water can further be improved. Therefore, the invention of claim 3 is particularly useful when the amount of cooling water is reduced.

  The inlet pipe is preferably made of a synthetic resin from the viewpoint of ease of manufacture and weight reduction. However, in the configuration of claim 4, when manufacturing using a mold, the inner surface of the bottom wall in the discharge portion is Since it can be molded by the core (inner mold) that forms the inner surface of the inlet pipe, it can be molded in a state where the mold can be easily removed.

  In addition, when cooling water flows in the left-right direction from the cooling discharge part, directionality is given so as to go obliquely upward along the circular arc surface, so even if the amount of cooling water flowing through the inlet pipe is small, the cooling water is moved in the left-right direction. You can fly as far as possible. Therefore, it is possible to contribute to improving the dispersibility of the cooling water when the amount of cooling water is small.

It is the front view which looked at a 1st embodiment from the advance direction of a car. (A) is a perspective view of an inlet pipe, (B) is a principal part front view. 3A is a cross-sectional view taken along the line IIIA-IIIA in FIG. 2B, and FIG. 3B is a cross-sectional view taken along the line BB in FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. It is a figure which shows other embodiment.

  Next, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to an automobile radiator. In the present application, front / rear / left / right words are used to specify the direction, but the front / rear / left / right are defined with the traveling direction of the automobile in front.

(1). Structure of First Embodiment First, the first embodiment shown in FIGS. As shown in FIG. 1, the radiator includes an upper tank 1 and a lower tank 2 that have a rectangular shape in the left-right direction, and a heat exchange unit 3 disposed between them. The heat exchange unit 3 is composed of a large number of tubes 4 communicating with the upper tank 1 and the lower tank 2, and a group of zigzag radiating fins (not shown) arranged between the adjacent tubes 4. Yes.

  The upper tank 1 and the lower tank 2 are made of aluminum, and in both cases, cover members 5 and 6 made of synthetic resin are fitted from above and below. The radiator is arranged below the front frame (radiator support) (not shown) of the automobile. The cover members 5 and 6 are provided with positioning protrusions 7 for each of the left and right fittings that fit into the front frame. ing.

  A cylindrical inlet pipe 8 that allows cooling water to flow into the upper tank 1 is attached to a position of the longitudinal one side plate 1a in the upper tank 1 that is slightly shifted to the right from the middle intermediate position. The inlet pipe 8 is arranged in a horizontal posture, and its axis is orthogonal to the longitudinal one side plate 1a. Needless to say, one end 8a of the inlet pipe 8 and the cooling water distribution part provided in the cylinder head are connected by a hose (not shown). In addition, although the outlet pipe is attached to the lower tank 2, illustration is abbreviate | omitted.

  The inlet pipe 8 is a molded product made of a synthetic resin. As clearly shown in FIG. 2, an upward cylindrical portion 9 is integrally provided in the middle of the front and rear, and the upward cylindrical portion 9 is in the state of the upward cylindrical portion 9 more than the upward cylindrical portion 9. A large-diameter radiator cap attaching portion 10 is integrally provided, and a laterally small diameter cylinder 11 connected to a reservoir tank (not shown) via a hose is integrally provided on the radiator cap attaching portion 10.

  Although not shown in the drawings, the radiator cap has a built-in differential pressure valve, and cooling water is sent from the reservoir tank to the upper tank 1 or returned from the upper tank 1 to the reservoir tank by the action of the differential pressure valve. The water level inside 1 is automatically adjusted.

  As shown in FIG. 3A, the longitudinal one side plate 1a of the upper tank 1 is provided with a holder 12 having a diameter reduced stepwise from the front toward the rear, while the inlet pipe 8 has a holder A mounting portion 13 that is non-rotatably fitted to 12 is integrally formed. The mounting portion 13 is mounted on the holder 12 via a seal material (not shown).

  Furthermore, the inlet pipe 8 has a discharge part 14 that has entered the inside of the upper tank 1, and a left cooling water outlet hole 15 a and a right cooling water outlet hole 15 b are formed in the discharge part 14. The most distal end of the discharge section 14 is constituted by a tip wall 16, and the left cooling water outlet holes 15 a and 15 b are divided by an upper wall 17 and a bottom wall 18. The inner peripheral surface and the outer peripheral surface of the upper wall 17 and the bottom wall 18 are circular arc surfaces that are concentric with the axial center of the inlet pipe 8.

  As clearly shown in FIG. 3 (B), the upper wall 17 is narrow and positioned in the middle of the left and right of the inlet pipe 8, but the bottom wall 18 is slightly moved to the right in front view (counterclockwise) ). Therefore, the opening area of the left cooling water outlet hole 15a is larger than the opening area of the right cooling water outlet hole 15b. The reason why the opening areas of the cooling water outlet holes 15a and 15b are made different is that the volume of the left part of the inlet pipe 8 in the upper tank 1 is larger than the volume of the right part. In FIG. 3B, the tube 4 is omitted.

  In any case, the left and right cooling water outlet holes 15 a and 15 b are opened obliquely upward as viewed from the axial center direction of the inlet pipe 8. In other words, the cooling water outlet holes 15a and 15b are formed by cutting the peripheral wall of the discharge portion 14 and the tip wall 16 obliquely. Further, the cooling water outlet holes 15a and 15b are offset so as to be shifted to the longitudinal other side plate 1b side in the upper tank 1.

  As clearly shown in FIGS. 3A and 4, the distal end wall 16 of the inlet pipe 8 is close to the longitudinal other side plate 1 b of the upper tank 1 through a gap 19 having a slight size, An auxiliary outlet hole 20 having a trapezoidal shape in front view is opened. As shown in FIG. 3B, the auxiliary outlet hole 20 is formed in a symmetrical trapezoidal shape and is located below the axis of the inlet pipe 8. Therefore, the opening area of the auxiliary outlet hole 20 is much smaller than the opening area of the cooling water outlet holes 15a and 15b.

(2) Summary When the cooling water flows in a state where the inlet pipe 8 is full or close to it, most of the cooling water is discharged into the upper tank 1 from the left and right cooling water outlet holes 15a and 15b. However, since the cooling water is being pumped, the direction is changed by the tip wall 16 and flows (flyed) in the left-right direction with momentum. Therefore, the cooling water can be widely dispersed inside the upper tank 1. As a result, it is possible to make the temperature of the cooling water flowing into each tube 4 uniform and prevent the heat exchange unit 3 from being cracked due to the difference in thermal expansion.

  In this case, since the cooling water outlet holes 15a and 15b are inclined obliquely upward, the cooling water can be blown as far as possible. Therefore, the cooling water dispersion function can be improved. In addition, since the left and right cooling water outlet holes 15a and 15b have different opening areas corresponding to the volume of the cooling water, the temperature of the cooling water can be made more uniform over the entire length of the upper tank 1. Has been.

  Since the upper wall 17 is also cut, a part of the cooling water that has traveled straight through the inlet pipe 8 passes through the left and right sides of the upper wall 17 as shown by arrows 21 in FIG. It collides with the side plate 1b, changes its direction by the other longitudinal side plate 1b and flows in the left-right direction.

  Accordingly, the other longitudinal side plate 1b of the upper tank 1 has a function of guiding the flow of the cooling water. However, as shown in FIG. 4, the group of the tubes 4 is slightly displaced in the front and rear sides from the inner side surface of the longitudinal other side plate 1b. Since there is a non-communication area 22 with a slight gap between the group of tubes 4 and the longitudinal other side plate 1b, a part of the cooling water is not allowed to flow into the tube 4, It is possible to move far in the left-right direction along the non-communication area 22. This also improves the cooling water dispersion function.

  When the amount of cooling water flowing through the inlet pipe 8 is small, the bottom wall 18 of the discharge portion 14 plays a role of a trap, and the amount of cooling water discharged from the auxiliary outlet hole 20 is relatively increased. The cooling water discharged from the auxiliary outlet hole 20 collides with the longitudinal other side plate 1b of the upper tank 1 as shown by an arrow 23 in FIG. 3B and FIG. However, as described above, the space between the longitudinal other side plate 1b and the group of the tubes 4 is the non-communication area 22, so that the cooling water is distant through the non-communication area 22. It can flow. Thereby, even when the amount of water is small, the water temperature inside the upper tank 1 can be equalized.

  In addition, although the cooling water which went out of the auxiliary | assistant exit hole 20 goes also below, since the cooling water which went to the bottom reaches the non-communication area 22 and changes direction in the left-right direction, it contributes to a dispersion | distribution function improvement. The left and right cooling water outlet holes 15a and 15b are rectangular in a plan view, but if formed into a trapezoid whose width narrows toward the tip, the function of applying the cooling water to the longitudinal other side plate 1b of the upper tank 1 is enhanced. It is estimated that the dispersion function using the longitudinal other side plate 1b can be improved.

  Now, the mold apparatus for manufacturing the inlet pipe 8 includes a core for forming the inside thereof, an outer mold for forming the outer surface, and a slide pin for forming the inner surface of the upward cylindrical portion 9. The outer mold is constituted by a split mold that comes into close contact with and separates in a direction orthogonal to the paper surface, based on FIG. 3A. And since the upper wall 17 and the bottom wall 18 of the discharge part 14 have the circular arc surface concentric with the axial center of the inlet pipe 8, it can shape | mold with a core and can also perform die-cutting without a problem. Therefore, the cost does not increase.

(3). Other Embodiments In FIG. 5, another embodiment which is another aspect of the discharge unit 14 is displayed. This point will be described next.

  In the second embodiment shown in FIG. 5A, the left and right cooling water outlet holes 15a and 15b are continuously opened in series and are completely opened in the distal direction. Therefore, the upper wall 17 and the tip wall 16 existing in the first embodiment are not provided. In this embodiment, the cooling water outlet holes 15a and 15b cooperate with the upper surface of the upper tank 1 and the other longitudinal side plate 1b to divert the cooling water in the left-right direction.

  In the third embodiment shown in FIG. 5B, the left and right cooling water outlet holes 15a and 15b are continuously connected in the same manner as in the second embodiment, but unlike the second embodiment, a circular tip is provided. A wall 16 is provided. Therefore, it can be said that the direction changing function in the left-right direction is higher than that in the second embodiment. As indicated by the alternate long and short dash line, the tip wall 16 may be cut in accordance with the shape of the cooling water outlet holes 15a and 15b.

  In the fourth embodiment shown in FIG. 5C, the left and right cooling water outlet holes 15 a and 15 b are formed between the upper wall 17 and the bottom wall 18, and the tip wall 16 is not provided. In the fifth embodiment shown in FIG. 5D, a partition wall 24 that divides the inside of the discharge section 14 into left and right is provided in conjunction with the embodiment of (C). When the tip of the discharge part 14 is close to the longitudinal other side plate 1b of the upper tank 1, the direction of the cooling water can be accurately changed by the longitudinal other side plate 1b.

  The embodiment of the present invention has been described above, but the present invention can be embodied in various ways. For example, the cooling water outlet hole can be configured not to reach the tip of the discharge part. It is also possible to form a plurality of cooling water outlet holes on the left, right, or both.

  The present invention can be embodied in a radiator for an automobile or the like. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Upper tank 2 Lower tank 3 Heat exchange unit 4 Tube 8 Inlet pipe 9 Upward cylinder part 10 Radiator cap attaching part 14 Discharge part 15a, 15b Cooling water outlet hole 16 Tip wall 17 Upper wall 18 Bottom wall 19 Clearance 20 Auxiliary outlet hole 21 Non-communication area

Claims (4)

An upper tank that is elongated in the horizontal direction and has a longitudinal one side plate and a longitudinal other side plate in a substantially vertical posture, and an inlet pipe that feeds cooling water into the upper tank from a midway between one end and the other end of the longitudinal one side plate. The inlet pipe has a discharge part that has entered the inside of the upper tank,
A cooling water outlet hole is formed in the discharge portion of the inlet pipe to flow the cooling water separately in the left-right direction when viewed from the axial center direction of the inlet pipe.
Radiator. The cooling water outlet holes are provided in a pair on the left and right with the axis of the inlet pipe interposed therebetween, and are opened obliquely upward as viewed from the axial direction of the inlet pipe.
The radiator according to claim 1. The tip of the discharge part is provided with a tip wall continuous with the bottom surface of the discharge part, and an auxiliary outlet hole is provided in the tip wall.
The radiator according to claim 1 or 2. The inlet pipe is made of synthetic resin, and the discharge part has a bottom wall whose inner peripheral surface is formed on an arc surface concentric with the axis of the inlet pipe.
The radiator according to claim 1.

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