JP2003065696A - Radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the performance of separating air from cooling water without using an expansion tank. SOLUTION: The radiator R comprises a radiator core 11 connecting a large number of water tubes 14 by a large number of cooling fins 15, an upper tank 12 disposed above the radiator core 11 to communicate with the upper end of the water tubes 14, a lower tank 13 disposed below the radiator core 11 to communicate with the lower end of the water tubes 14, and a pressure cap 18 provided on the upper surface of the upper tank 12. Interior of the upper tank 12 is partitioned by a baffle plate 21 extending horizontally into an upper chamber 22 and a lower chamber 23. The upper chamber 22 is provided with a cooling water supply opening 25 and a passage 24 interconnecting the upper chamber 22 and the lower chamber 23 is formed at least a part of the baffle plate 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator for cooling the cooling water, which has passed through a water jacket of an engine and whose temperature has risen, by exchanging heat with the air, and more particularly to removing air from the cooling water. For the structure.

[0002]

2. Description of the Related Art A radiator is provided with a reserve tank for separating and discharging air mixed in cooling water circulating through a water jacket and a radiator of an engine. This reserve tank is connected to the pressure cap provided on the radiator upper tank via an overflow pipe, and when the internal pressure of the upper tank increases due to expansion due to the temperature rise of the cooling water, the relief valve provided on the pressure cap opens. The air separated from the cooling water and the surplus cooling water are discharged to the reserve tank to bleed the air.

However, since the reserve tank described above does not always have sufficient performance of separating air from the cooling water, one having an expansion tank having high performance of separating air is used. The expansion tank is installed separately from the circulation path of the cooling water and is arranged in the path connecting the radiator and the engine.It separates air from the cooling water passing through the expansion tank while the engine is operating. There is.

[0004]

By the way, the air separation device using the conventional expansion tank requires a special pipe connected to the expansion tank, and the expansion tank has a high pressure resistance and heat resistance specifications. Therefore, problems such as a significant increase in cost and deterioration of layout are caused by the necessity of arranging the expansion tank and the expansion tank at the highest position of the cooling system.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enhance the performance of separating air from cooling water without using an expansion tank.

[0006]

In order to achieve the above object, according to the invention as set forth in claim 1, a radiator core in which a large number of vertically extending water tubes are connected by cooling fins and a radiator core are provided. A horizontally elongated upper tank provided at the upper portion and communicating with the upper end of the water tube, a horizontally elongated lower tank provided at the lower portion of the radiator core and communicating with the lower end of the water tube, and provided on the upper surface of the upper tank. In a radiator that has a pressure cap and that discharges cooling water supplied from the cooling water supply port of the upper tank through the water tube of the radiator core and discharges it from the cooling water discharge port of the lower tank, a partition that extends horizontally inside the upper tank. The upper and lower chambers are partitioned by separating the upper and lower parts with a plate, and the cooling water supply port is provided in the upper chamber. Kicking with the radiator, characterized in that the formation of the communication passage for communicating the upper chamber and the lower chamber to at least a portion of the partition plate is proposed.

According to the above construction, the inside of the upper tank of the radiator is vertically divided by the partition plate extending in the horizontal direction to partition the upper chamber and the lower chamber, and the cooling water supplied from the cooling water supply port provided in the upper chamber. Is supplied from the communication passage to the lower chamber, and then discharged from the cooling water discharge port through the radiator core and the lower tank.Therefore, the flow velocity of the cooling water flowing through the upper chamber is reduced to promote air separation, and the separated air is separated. It can be reliably discharged from the pressure cap. Further, the cooling water flowing through the lower chamber also has a low flow velocity and takes a long time to flow into the water tube, so that the air accumulated in the lower chamber can be discharged from the pressure cap through the communication passage and the upper chamber. This makes it possible to enhance the performance of separating air from the cooling water by using the existing reserve tank without using the conventional expansion tank.

According to the invention described in claim 2,
In addition to the structure of claim 1, there is proposed a radiator characterized in that a communication passage is provided at one end side in the longitudinal direction of the upper tank, and a cooling water supply port is provided at the other end side in the longitudinal direction.

According to the above construction, since the communication passage and the cooling water supply port are provided at both ends of the upper tank in the longitudinal direction, the distance in which the cooling water flows through the upper chamber is maximized to achieve the air separation effect. Can be increased.

According to the invention described in claim 3,
In addition to the configuration of claim 1 or claim 2, a radiator is proposed in which a large number of small holes are provided so as to penetrate the partition plate.

According to the above construction, since a large number of small holes are provided so as to penetrate the partition plate, even if the partition plate should fall off and close the upper end opening of the water tube of the radiator core, the small holes of the partition plate should be closed. The function of the radiator can be maintained by allowing the cooling water to flow from the upper tank to the water tube via the above.

According to the invention described in claim 4,
In addition to the structure according to any one of claims 1 to 3, a communication passage is provided at one longitudinal end of the upper tank, and a cooling water discharge port is provided at the other longitudinal end of the lower tank. A radiator that does is proposed.

According to the above construction, the communication passage is provided at one end side in the longitudinal direction of the upper tank, and the cooling water discharge port is provided at the other end side in the longitudinal direction of the lower tank. Therefore, the cooling water is used for all the water tubes of the radiator core. The cooling performance of the radiator can be improved by allowing the radiator to pass uniformly.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a partially cutaway front view of a radiator, and FIG. 2 is FIG.
2-2 line sectional view, FIG. 3 is a 3-3 line sectional view of FIG.
[Fig. 4] is an operation explanation diagram corresponding to Fig. 3.

As shown in FIGS. 1 to 3, a radiator R for cooling the cooling water whose temperature has risen by passing through a water jacket of an automobile engine includes a plate-shaped radiator core 11 and an upper surface of the radiator core 11. And an upper tank 12 provided on the lower surface of the radiator core 11 and a lower tank 13 provided on the lower surface of the radiator core 11.

The radiator core 11 is formed by connecting a large number of water tubes 14 arranged in the vertical direction with a large number of cooling fins 15 arranged in the horizontal direction, and the flow direction of the cooling air (orthogonal to the plane of FIG. 1). The water tubes 14 formed in a flat shape along the direction (in which the direction is defined) are arranged in a single row or a plurality of rows (two rows in front and rear in the embodiment). Side plates 16, 16 having a U-shaped cross section for reinforcing the radiator core 11 are provided on both left and right sides of the radiator core 11.

A well-known pressure cap 18 provided on the upper surface of a tank body 17 which constitutes the outer shell of the upper tank 12.
Has a relief valve and a vacuum valve therein, and is connected to the reserve tank 20 via an overflow pipe 19. The interior of the upper tank 12 elongated in the left-right direction is divided into an upper chamber 22 and a lower chamber 23 by a partition plate 21 extending in the horizontal direction. Rectangular partition 2
3 is welded to the inner surface of the upper tank 12, and a communication passage 24 for communicating the upper chamber 22 and the lower chamber 23 with each other is formed at one end side thereof. The cooling water supply port 25 for supplying the cooling water from the engine to the upper tank 12 is
It is provided on the other end side of the upper chamber 22 of the upper tank 12, that is, on the side away from the communication passage 24. A large number of small holes 21a ... Are formed through the partition plate 21.

A cooling water discharge port 27 for returning cooling water to the engine is provided on the other end side of the tank body 26 forming the outer shell of the lower tank 13, that is, on the side away from the communication passage 24.

Next, the operation of the embodiment of the present invention having the above construction will be described.

When the cooling water whose temperature has risen through the water jacket of the engine is supplied from the cooling water supply port 25 of the upper tank 12 of the radiator R to the upper chamber 22,
The cooling water flows along the upper surface of the partition plate 21 from the other end side of the upper chamber 22 to the one end side and drops from the communication passage 24 into the lower chamber 23. Is distributed to a large number of water tubes 14 of the radiator core 11 while flowing from the other end side. Water tube 14
The cooling water flowing through the ... Is cooled by heat exchange between a large number of cooling fins 15 and the air, is collected in the lower tank 13, and is returned from the cooling water discharge port 27 to the engine.

From the cooling water supply port 25 to the upper tank 12
Since the cooling water supplied to the cooling water is not immediately distributed to the water tubes 14 and flows along the upper chamber 22 of the upper surface of the partition plate 21, the flow velocity decreases, so that the air contained in the cooling water is efficiently separated. And gather at the upper part of the upper chamber 22. Further, since the flow velocity of the cooling water flowing along the lower chamber 23 on the lower surface of the partition plate 21 also decreases, the air efficiently separated from the cooling water collects from the lower chamber 23 to the upper chamber 22 via the communication passage 24. .

Since the pressure cap 18 is provided on the upper surface of the upper chamber 22 of the upper tank 12, when the temperature of the cooling water rises and volume expansion occurs due to the completion of warming up of the engine, the internal pressure of the upper tank 12 increases. As a result, the relief valve of the pressure cap 18 is opened, and the air accumulated in the upper chamber 22 is discharged to the reserve tank 20 through the overflow pipe 19 together with the surplus cooling water. Further, when the cooling water temperature decreases and the volume contracts after the engine is stopped, the vacuum valve of the pressure cap 18 opens and only the cooling water in the reserve tank 20 is returned to the upper tank 12 through the overflow pipe 19. .

As described above, since the upper tank 12 of the radiator R is separated into the upper chamber 22 and the lower chamber 23 by the partition plate 21 and the cooling water flow path is lengthened, the upper chamber 22 is separated.
The air separation can be promoted while the cooling water flows through the lower chamber 23. In particular, since the cooling water supply port 25 and the communication passage 24 are separately arranged on the other end side and one end side of the upper chamber 22, the cooling water is caused to flow over the entire length of the upper chamber 22 to achieve the air separation effect. It can be further increased. Thereby, the air can be effectively separated from the cooling water by using the conventional reserve tank 20 without providing the expansion tank. Further, since the cooling water discharge port 27 of the lower tank 13 is provided on the other end side of the lower tank 13 which is separated from the communication passage 24, the cooling water passing through the communication passage 24 is only in the water tube 14 in the vicinity of the communication passage 24. Can be prevented from flowing into the lower tank 13, and the cooling water can be evenly distributed to all the water tubes 14 to effectively exert the cooling effect of the radiator R.

By the way, if the welded portion for fixing the partition plate 21 inside the upper tank 12 comes off for some reason, the partition plate 21 falls to the bottom of the upper tank 12 and closes the upper end opening of the water tube 14. Therefore, the function of the radiator R may be lost. Therefore, in this embodiment, a large number of small holes 21a ... Are made to penetrate the partition plate 21 so that when the partition plate 21 falls, the small holes 2 are formed.
Cooling water can be circulated through 1a, and the function of the radiator R can be maintained even in case of emergency. Even when the partition plate 21 is normally fixed, a part of the cooling water drops from the upper chamber 22 to the lower chamber 23 through the small holes 21a, but the diameter of the small holes 21a ...
Since it is much smaller than the cross-sectional area of the passage,
The cooling water passing through 1a is not so large as to impair the function of the partition plate 21.

The embodiments of the present invention have been described in detail above, but the present invention can be modified in various ways without departing from the scope of the invention.

For example, although the radiator R of the engine of the automobile is illustrated in the embodiment, the present invention can be applied to a radiator for any other application. Further, although the reserve tank 20 is provided in the embodiment, it is also possible to omit it.

Further, in the first embodiment, the radiator R is provided with the flat plate-shaped cooling fins 15 ... However, even if the radiator R is provided with the zigzag-shaped cooling fins 15 ... As in the second embodiment shown in FIG. good.

[0029]

As described above, according to the invention described in claim 1, the inside of the upper tank of the radiator is vertically divided by a partition plate extending in the horizontal direction to partition the upper chamber and the lower chamber, and the upper chamber is divided. Since the cooling water supplied from the cooling water supply port provided in the above is supplied to the lower chamber from the communication passage and then discharged from the cooling water discharge port through the radiator core and the lower tank,
The flow velocity of the cooling water flowing through the upper chamber can be reduced to promote air separation, and the separated air can be reliably discharged from the pressure cap. In addition, the cooling water flowing through the lower chamber has a low flow velocity and it takes time to flow into the water tube.
The air accumulated in the lower chamber can be discharged from the pressure cap through the communication passage and the upper chamber. This makes it possible to enhance the performance of separating air from the cooling water by using the existing reserve tank without using the conventional expansion tank.

According to the invention described in claim 2,
Since the communication passage and the cooling water supply port are provided at both longitudinal ends of the upper tank, the distance in which the cooling water flows in the upper chamber can be maximized to enhance the air separation effect.

According to the invention described in claim 3,
Since a large number of small holes are provided to penetrate the partition plate, even if the partition plate falls off and closes the upper end opening of the radiator core water tube, the cooling water is supplied from the upper tank to the water through the small holes of the partition plate. The function of the radiator can be maintained by flowing it into the tube.

According to the invention described in claim 4,
Since a communication passage is provided on one end side in the longitudinal direction of the upper tank, and a cooling water discharge port is provided on the other end side in the longitudinal direction of the lower tank,
It is possible to enhance the cooling performance of the radiator by allowing the cooling water to uniformly pass through all the water tubes of the radiator core.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a radiator.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is an operation explanatory diagram corresponding to FIG.

FIG. 5 is a partially cutaway front view of a radiator according to a second embodiment.

[Explanation of symbols]

11 radiator core 12 Upper tank 13 Lower tank 14 water tubes 15 cooling fins 18 Pressure cap 21 Partition board 21a small hole 22 Upper chamber 23 lower chamber 24 passages 25 Cooling water supply port 27 Cooling water outlet

Claims (4)

[Claims] 1. A radiator core (11) in which a large number of vertically extending water tubes (14) are connected by cooling fins (15), and an upper end of the water tube (14) provided at the top of the radiator core (11). A horizontally elongated upper tank (12) communicating with the lower tank, a horizontally elongated lower tank (13) provided at a lower portion of the radiator core (11) and communicating with a lower end of the water tube (14), and an upper tank (12). A pressure cap (18) provided on an upper surface of the upper tank (12), and a cooling water supply port (2) of the upper tank (12).
The cooling water supplied from 5) is passed through the water tube (14) of the radiator core (11) and the lower tank (1
In the radiator for discharging from the cooling water discharge port (27) of 3), the inside of the upper tank (12) is vertically divided by a partition plate (21) extending horizontally to separate the upper chamber (22) and the lower chamber (23). Partition the upper chamber (22) into the cooling water supply port (2
5) The radiator, characterized in that a communication passage (24) for communicating the upper chamber (22) and the lower chamber (23) is formed in at least a part of the partition plate (21). 2. The upper tank (12) according to claim 1, characterized in that a communication passage (24) is provided on one end side in the longitudinal direction, and a cooling water supply port (25) is provided on the other end side in the longitudinal direction. The listed radiator. 3. A plurality of small holes (21a) are provided so as to penetrate the partition plate (21).
Alternatively, the radiator according to claim 2. 4. An upper tank (12) is provided with a communication passage (24) at one longitudinal end thereof, and a cooling water discharge port (27) is provided at the other longitudinal end of the lower tank (13). The radiator according to any one of claims 1 to 3.