JPH0345035Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a radiator for automobiles, and is designed to improve heat dissipation ability when the flow rate of circulating cooling air is slow, especially when idling or at low speed. Concerning what has been done.

(Prior Art) Generally, the heat radiation amount Q of an automobile radiator has a characteristic that increases and decreases depending mainly on the area F of the heat radiation fins and the flow rate W of cooling air. The area F of these heat radiation fins and the cooling air flow rate W are the area F of the heat radiation fins.
As W increases, the pitch of the heat dissipation fins becomes narrower and the passage rate of the cooling air decreases, so the cooling air flow rate W increases.
There is a relationship in which the number decreases. For this reason, the radiator is designed to achieve an optimal state by adjusting the area F of the heat radiation fins and the flow rate W of cooling air so as to obtain the required amount of heat radiation that changes depending on the driving condition of the vehicle. In addition, the present inventors have confirmed through experiments that when the cooling air flow velocity is slow, the cooling air flow rate W contributes more to the increase in the heat radiation amount Q than the area F of the heat radiation fins.

By the way, a prior art related to an automobile radiator is disclosed in Japanese Utility Model Application Publication No. 55-158216.
In this prior art, the heat dissipation fins of the radiator are made sparse on the intake system side of the engine and densely arranged on the non-intake system side to lower the intake air temperature, which affects output and exhaust gas purification.

By the way, the space in the engine compartment of a car is becoming more and more restricted and narrower.
For this reason, it may not be possible to freely select the positions of the cooling water inlet and the cooling water outlet of the radiator. In such cases, the cooling water inlet and the cooling water outlet are concentrated on one side of the upstream tank and the downstream tank of the radiator.

On the other hand, when a car is operating at high speed, in which a large amount of cooling water is circulated through all of the water pipes, the amount of air flowing through the vehicle is large, so even if the pitch of the heat dissipation fins is densely formed, the amount of cooling air that passes through is large and the air is radiated. The amount of heat can be increased.

However, during low-speed operation, the amount of running air is small, so if the pitch of the heat dissipation fins is made dense, the amount of passing cooling air will be significantly reduced and the amount of heat dissipated will be significantly reduced.

Therefore, it is required to perform cooling that is adapted to the amount of running air and the amount of circulating cooling water, which vary depending on the driving state of the vehicle.

(Purpose of the invention) In view of the above circumstances, the present invention is designed to circulate cooling water through a predetermined water pipe corresponding to a cooling water inlet and a cooling water outlet and a water pipe near this water pipe during low-speed operation. The purpose of this invention is to provide a radiator for automobiles that can perform cooling that is adapted to the running air volume, the amount of circulating cooling water, and the water pipes in the area through which the cooling water passes, which vary depending on the driving condition. It is said that

In order to achieve the above object, the present invention includes an upstream tank and a downstream tank that are arranged opposite to each other and are connected in a communicating state by a plurality of water pipes of these tanks. In an automobile radiator in which a cooling water inlet is provided corresponding to the inlet of a predetermined water pipe, and a cooling water outlet is provided corresponding to the outlet, the cooling water inlet and the cooling water outlet are made to correspond at a short distance. The pitch of the heat radiation fins fixed to the predetermined water pipe and the water pipes in the vicinity of this water pipe is set larger than the pitch of the heat radiation fins fixed to other water pipes.

With this configuration, during high-speed operation of a car where a large amount of cooling water is circulated through all of the water pipes, the amount of air flowing through the vehicle is large, so even if the pitch of the heat dissipation fins is densely formed, the passing cooling can be achieved. By increasing the air volume, the amount of heat dissipation can be increased.

In addition, the heat dissipation fins of the predetermined water pipe through which cooling water circulates during low-speed operation with low airflow and the water pipes near this water pipe are roughened, so that the amount of heat dissipation is increased by maximizing the amount of passing cooling air. be able to.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Reference numeral 1 in FIG. 1 denotes an upper tank as an upstream tank, and this upper tank 1 is provided with a radiator cap 2 and a cooling water inlet 3 disposed at the right end. One end of a plurality of water pipes 4 is connected to this upper tank 1, and the other end of the water pipe 4 is connected to a lower tank 5 which is a downstream tank.
It is connected to the. That is, both tanks 1 and 5 are connected in a communicating state by a plurality of water pipes 4.
And, it is connected in front of the lower tank 5.
A cooling water outlet 6 is located at a position corresponding to the cooling water inlet 3 of the lower tank 5, that is, at the right end.
is provided. That is, the cooling water inlet 3 corresponds to the inlet of a predetermined water pipe 4 among the plurality of water pipes 4.
is provided, and a cooling water outlet 6 is provided corresponding to the outlet. Further, a heat radiation fin 7 is fixed to the outer peripheral surface of the water pipe 4, and the distance between the heat radiation fins 7, that is, the pitch is set to T at the right end of the radiator, as shown in FIG. As shown in FIG. 2, the pitch of the heat dissipation fins 7 is set to t, which is narrower than the pitch T at the right end, in areas other than the right end. In other words, the pitch T of the heat dissipating fin 7 fixed to the predetermined water pipe 4 and the water pipe 4 in the vicinity of this water pipe 4 is changed to the pitch T of the heat dissipating fin 7 fixed to the other water pipe 4.
It is set larger than . Therefore, T and t
The relationship with is t<T.

The operation of an embodiment of the apparatus having such a configuration will be explained. For example, when the vehicle is idling or running at low speed, that is, when the engine speed is low, the flow rate of the cooling air flowing through the radiator is also slow. When the temperature reaches such a high temperature that the cooling water flows, most of the cooling water that has flowed into the upper tank 1 from the cooling water inlet 3 flows through the water pipe 4 corresponding to the cooling water inlet 3 and the water pipes 4 in its vicinity. The cooling water flows into the lower tank 5 through the cooling water outlet 6 and flows out from the cooling water outlet 6. Since the pitch T of the heat radiation fins 7 of the water pipes 4 communicating between the vicinity of the cooling water inlet 3 and the vicinity of the cooling water outlet 6 is set larger than that of other parts, the passage rate of cooling air is increased. Therefore, the amount W of cooling air flowing through this portion increases, the heat dissipation ability of the radiator improves, and effective cooling is achieved.

Therefore, in the device of the above embodiment, even when the required amount of heat radiation increases when the engine rotates at low speeds, the cooling water can be cooled to the required temperature to prevent overheating.

Note that the present invention is not limited to the above embodiment. For example, the cooling water inlet and the cooling water outlet are not necessarily provided at the right end of the radiator, but may also be provided, for example, at the center of the radiator.

(Effects of the invention) As explained above, according to the invention, an upstream tank and a downstream tank are arranged facing each other, and these tanks are connected in a communicating state in front by a plurality of water pipes. A cooling water inlet is provided corresponding to the inlet of a predetermined water pipe among these water pipes, and a cooling water outlet is provided corresponding to the outlet, so that the cooling water inlet and the cooling water outlet are connected at a short distance. In compatible automobile radiators, during high-speed operation of automobiles in which a large amount of cooling water is circulated through all the water pipes, there is a large amount of running air, so even if the pitch of the heat dissipation fins is formed closely, the passing cooling will not be possible. The amount of heat dissipation can be increased by increasing the air volume, and during low-speed operation with low airflow, the amount of heat dissipated from a predetermined water pipe through which a small amount of cooling water passes and the water pipes near this water pipe is increased. Since the performance can be improved, it becomes possible to perform cooling that is adapted to the running air volume and circulating water volume of cooling water, which vary depending on the driving state of the vehicle, and the water pipes in the area through which the cooling water passes.

[Brief explanation of the drawing]

Figures 1 to 3 are views showing one embodiment of the present invention, in which Figure 1 is a front view of the radiator, Figure 2 is an enlarged view of a portion of Figure 1, and Figure 3 is an enlarged view of a portion of Figure 1. Figure. 1...Atsupa tank (upstream tank), 3...
...Cooling water inlet, 4...Water pipe, 5...Lower tank, 7...Radiation fin.

Claims (1)

[Scope of utility model registration request] An upstream tank and a downstream tank are arranged to face each other, and these tanks are connected in a communicating state by a plurality of water pipes, and the cooling is performed in correspondence with the inlet of a predetermined water pipe among these water pipes. In an automobile radiator in which a water inlet is provided and a cooling water outlet is provided corresponding to the outlet, the cooling water inlet and the cooling water outlet are made to correspond at a short distance,
A radiator for an automobile, characterized in that the pitch of the heat radiation fins fixed to the predetermined water pipe and the water pipe in the vicinity of this water pipe is set larger than the pitch of the heat radiation fins fixed to other water pipes.