JPH0776528B2 - Car radiator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile radiator, and more particularly to the shape of a water injection port.

[0002]

2. Description of the Related Art In a conventional automobile radiator, a cylindrical member is connected to a water inlet provided in an upper tank of the radiator as disclosed in JP-A-55-41391. A radiator cap having a negative pressure component and a pressurizing valve is fitted in the cylindrical shape.
Further, a connection pipe communicating with the reserve tank is connected to the side wall of the cylindrical member.

In this automobile radiator, when the pressure in the upper tank exceeds a predetermined value, the pressurizing valve of the radiator cap is opened, and by opening this pressurizing valve, the superheated steam in the upper tank is pressurized. And is returned to the reserve tank through the connecting pipe.

[0004]

However, the above-described automobile radiator has the following problems. That is, when the pressurizing valve is opened, the superheated steam in the upper tank is jetted from the circular seating surface of the pressurizing valve in all directions. The flow of this superheated steam becomes a swirl flow having all flow direction components inside the cylindrical member. However, the connecting pipe only opens at one place on one side surface of the cylindrical member, and the superheated steam swirling with any flow direction component inside the cylindrical member smoothly moves from the connecting pipe to the reserve tank. It is difficult to recirculate. As a result, there is a problem that the swirl flow inside the cylindrical member cannot be fully escaped and the pressure inside the cylindrical member rises, which in turn greatly affects the set valve opening pressure of the pressurizing valve.

[0005]

In view of the above problems, in the present invention, when the pressurizing valve is opened and the superheated steam is ejected from the water injection port, the superheated steam smoothly flows from the connecting pipe to the reserve tank. The purpose is to Then, the following technical means were used to achieve this purpose. That is, the tubular member connected to the water inlet is composed of an inner tubular pipe and an outer tubular pipe, and a communication passage is formed between the inner tubular pipe and the outer tubular pipe. A connecting pipe is provided on the outer tube, one end of which is opened to the fluid passage and the other end of which is opened to the reserve tank. The communication passage is formed only near the one end opening of the connecting pipe.

[0006]

The superheated steam ejected by opening the pressurizing valve is rectified toward the connecting pipe by flowing through the communication passage. Then, after being rectified, it flows out from the connection pipe to the reserve tank.

[0007]

As described above, in the automobile radiator of the present invention, the superheated steam ejected by pushing and opening the pressurizing valve is rectified by flowing through the communication passage, and at this time, the flow direction is unified toward the connecting pipe. Therefore, it can smoothly flow into the reserve tank through the connecting pipe.
As a result, the superheated steam can be satisfactorily sent to the reserve tank side without increasing the pressure inside the inner cylinder pipe and the outer cylinder pipe, and the valve opening pressure of the pressurizing valve can be maintained at an appropriate value.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 is a front view showing an automobile radiator 500 of this embodiment. In the upper tank 10 molded from resin,
A cooling water inlet port 14 is formed to receive the high temperature cooling water from a vehicle running engine (not shown). The cooling water inlet 14 has an inner diameter of a certain value or more depending on the joining condition with the pipe extending from the engine. A water injection port 16 for supplying cooling water is opened on the upper surface of the upper tank 10, and a cap 200 is connected to the water injection port 16. A mounting bracket 18 is formed at the upper end of the upper tank 10, and the entire vehicle radiator 500 is fixed to the fixing portion by the mounting bracket 18.

One end of a plurality of tubes 30 is connected to the upper tank 10, and a lower tank 20 made of resin is connected to the other end of the tubes 30. Corrugated fins 32 are joined between the plurality of tubes 30, respectively. Further, the lower tank 20 is provided with a cooling water outlet 21 through which the cooling water that has passed through the tube 30 from the upper tank 10 and has flowed into the lower tank 20 flows out again toward the engine. Note that 41, 42
It shows a caulking plate.

A cylindrical outer cylinder tube and an inner cylinder tube having a double pipe structure are connected to the water injection port 16, and a cap 200 is fitted to the outer cylinder tube. Further, a connecting pipe 111 that is connected to the reserve tank is provided on the outer tube.

Next, the structure of the water injection port will be described. 1 is a view showing a II cross section in FIG. 5, and FIG. 2 is a view showing a state when the cap 200 is removed from the one shown in FIG. The foot portion 11 of the upper tank 10 having a semicircular cross section has an O-ring 44 in the groove of the core plate 43.
It is inserted through. Then, the caulking plate 4 is formed so as to wrap around the core plate 43 and the foot 11.
1, the upper tank 10 and the core plate 43 are connected to each other. A plurality of tubes 30 are connected to the core plate 43 by means such as brazing.

A water injection port 16 for replenishing cooling water is opened on the upper surface of the upper tank 10. This water inlet 16
One end of an inner cylindrical tube 101 having a cylindrical shape is connected around the. The inner cylinder pipe 101 extends upward from the water injection port 16, and the other end forms an inner cylinder seal end 105.

One end of an outer cylindrical tube 103 having the same cylindrical shape is connected to the outer peripheral wall of the inner cylindrical tube 101 at a substantially intermediate position. The outer tube 103 also extends upward coaxially with the inner tube 101, and the other end forms an outer tube seal end 107. Further, the flange portion 109 is provided at the other end.
An outer lid 201 of a cap 200, which will be described later, is fitted on the flange portion 109.

The inner diameter of the outer cylindrical tube 103 is larger than the outer diameter of the inner cylindrical tube 101 by a predetermined amount. In this embodiment, the outer tube 103 has an inner diameter of 31 mm and the inner tube 101 has an outer diameter of 24 mm.
mm. In addition, the inner cylinder seal end 1 of the inner cylinder pipe 101
The outer cylinder seal end 107 of the outer cylinder tube 103 is formed at a position higher than 05. A connecting pipe 111 communicating with a reserve tank (not shown) is connected to the outer tube 103, and one end of the connecting pipe 111 is open at a position facing a communication passage 117 described later.

In this embodiment, the upper edge of the opening of the connecting pipe 111 is located at the same height as the sealing end surface of the inner cylinder seal end 105, and the lower edge of the opening is located slightly higher than the bottom surface of the communication passage 117. is doing.

The cap 200 includes an outer lid 201 and an inner lid 203.
The seal packing 205 is sandwiched between and. When the outer lid 201 is fitted to the flange portion 109, the seal packing 205 is attached to the outer cylinder seal end 107.
Abuts and keeps the seal. In addition, the pressurizing valve body 20
A pressure valve seal packing 209 is joined to the pressure valve 7, and the pressure valve seal packing 209 is in contact with the inner cylinder seal end 105. The pressurizing valve main body 207 and the pressurizing valve seal packing 209 constitute a pressurizing valve.

A spring 215 is arranged between the pressurizing valve body 207 and the inner lid 203.
The pressurizing valve seal packing 209 is pressed against the inner cylinder seal end 105 by 15. Further, a negative pressure valve main body 211 is arranged in the pressurizing valve main body 207, and a negative pressure valve seal packing 213 is joined to the negative pressure valve main body 211.

In the state shown in FIG. 1, the negative pressure valve seal packing 213 is in contact with the pressurization valve main body 207. However, when the inside of the upper tank 10 is below atmospheric pressure, the negative pressure valve seal packing 213 is shown. 213 and the pressurizing valve main body 207 are separated from each other, and the inside of the upper tank 10 and the upper space of the pressurizing valve main body 207 are communicated with each other via a passage 217.

FIG. 3 is a view showing a III-III cross section of FIG. As can be seen from this figure, one end of the connecting pipe 111 is at a position facing the communication passage 117 and is open in the longitudinal direction of the upper tank 10. Since the cooling water inlet port 14 has an inner diameter larger than the height of the upper tank 10, the upper portion of the cooling water inlet port 14 and the inner cylindrical pipe 10 will be described.
The inside of 1 is communicated with an air vent passage 115, and the air accumulated above the cooling water inlet 14 is vented to the inside of the inner cylindrical pipe 101 from the air vent passage 115. The air vent passage 115 has a semicircular cross section, is formed in the upper portion of the upper tank 10, and the air vent passage 115 and the inside of the upper tank 10 communicate with each other.

A support piece 113 for supporting the connecting pipe 111 is formed between the connecting pipe 111 and the upper tank 10 from the root of the connecting pipe 111 to a substantially intermediate position.

FIG. 4 is a sectional view taken along line IV-IV in FIG. As can be seen from this figure, the communication passage 117 formed by the outer wall of the inner tubular tube 101 and the inner wall of the outer tubular tube 103.
Are formed only in the vicinity of one open end of the connecting pipe 111. The air vent passage 115 is formed at a position facing the connecting pipe 111 by 180 °.

Next, the operation of this embodiment will be described.
When the pressure in the upper tank 10 rises above a predetermined value, the pressure valve seal packing 209 separates from the inner cylinder seal end 105 against the biasing force of the spring 215 in response to this pressure rise. As a result, the superheated steam in the upper tank 10 flows into the communication passage 117 through between the inner cylinder seal end 105 and the pressurizing valve seal packing 209. When the superheated steam flows into the communication passage 117, the superheated steam having a disordered flow direction is unified in the flow direction along the communication passage 117. That is, the superheated steam passes through the inside of the communication passage 117 as shown by the arrow F in FIG.
To the reserve tank through the connecting pipe 111 opening toward the communication passage 117. Here, it is particularly important to note that the flow direction of the superheated steam in the communication passage 117 is such that the flow direction of the superheated steam is in the connecting pipe 1.
That is, it is unified toward 11 and can smoothly flow from the connecting pipe 111 toward the reserve tank.

When the pressure in the upper tank 10 becomes equal to or lower than the atmospheric pressure, the negative pressure valve seal packing 213 is separated from the pressurizing valve main body 207, and the inside of the upper tank 10 is provided with the passage 2.
The cooling water in the reserve tank is communicated with the upper space of the pressurizing valve main body 207 via the connection pipe 111 and the passage 21.
It will flow into the upper tank 10 via 7.

When the cooling water is replenished from the water injection port 16, the air accumulated in the upper part of the cooling water introduction port 14 is evacuated into the inner cylindrical pipe 101 through the air bleeding passage 115.

[Brief description of drawings]

1 is a cross-sectional view showing an embodiment of the present invention, taken along line I-I in FIG.
FIG.

FIG. 2 is a cross-sectional view showing a state in which a cap is removed from the state shown in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a front view showing an automobile radiator of an embodiment of the present invention.

[Explanation of symbols]

 10 Upper Tank 16 Water Injection Port 20 Lower Tank 30 Tube 101 Inner Tube 103 Outer Tube 105 Inner Tube Seal End 107 Outer Tube Seal End 111 Connecting Pipe 117 Fluid Passage 200 Cap 209 Seal Packing for Pressurizing Valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiichi Kato 1-1-chome, Kariya city, Aichi prefecture Nihon Denso Co., Ltd. (72) Inventor Satomi Muto 1-1-chome, Kariya city, Aichi prefecture Sozo Co., Ltd. (56) References Actually open Sho 56-131068 (JP, U) Actually open 61-37423 (JP, U) Actually open 60-14227 (JP, U)

Claims (3)

[Claims] 1. An upper tank that receives a cooling fluid from an internal combustion engine, one end of which is connected to the upper tank, a tube through which the cooling fluid in the upper tank passes, and the other end of which is connected. A lower tank that receives the cooling fluid that has passed through the inside of the tube, a water injection port that opens on the upper surface of the upper tank, and a cylindrical shape that has one end connected around the water injection port and the other end that opens upward. An inner cylinder tube, having an inner diameter larger than the outer diameter of the inner cylinder tube, one end of which is connected to the outer peripheral wall of the inner cylinder tube and the other end of which opens above the other end of the inner cylinder. A tubular outer tubular tube, a communication passage formed between the outer peripheral wall of the inner tubular tube and the inner peripheral wall of the outer tubular tube, seated at the other end of the inner tubular tube, in the upper tank When the pressure exceeds a specified value, the other end of the inner tube is opened. A reserve tank that has a valve and is fitted to the outer tube, and that is connected to the outer tube and has one end opening to the communication passage and the other end storing a cooling fluid. A radiator for a vehicle, comprising: a connection pipe that opens toward the front side of the connection pipe, wherein the communication passage is formed only near the one end opening of the connection pipe. 2. The radiator for an automobile according to claim 1, wherein the upper tank and the lower tank are made of resin. 3. The radiator for an automobile according to claim 1, wherein the cap includes a negative pressure valve for communicating the inner cylinder pipe when the pressure in the upper tank becomes equal to or lower than a predetermined value.