JPH029062Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to a cap that is detachably attached to the top surface of a tank of an automobile heat exchanger.

[Prior art and its problems]

Conventionally, a pressure valve has been provided protruding from the inner surface of the tank cap of an automobile heat exchanger. While the heat exchanger is in use, a valve opens and closes as the cooling water expands and contracts, allowing some of the cooling water in the tank to flow into the surge tank, or directing the cooling water in the surge tank to the heat exchanger tank. I had put it back inside. Such pressure valves have an inverted pot-shaped valve chamber with a lower lid that is watertightly fixed, and the entire valve chamber is attached to the cap body via a coil spring so that it can move freely in the axial direction. Ta. The peripheral edge of the lower lid is pressed against the stepped portion of the filler neck so as to be openable and closable. A negative pressure valve was provided in the center of the lower lid.
In conventional caps like this, when the internal pressure inside the tank exceeds a certain level, the entire lower lid lifts up.
The joint with the filler neck was opened and the cooling water overflowing from the tank was supplied to the surge tank. Therefore, the movable parts of the valve structure in response to positive pressure are large, and the structure inevitably becomes complicated.

[Purpose and structure of the invention]

Therefore, the present invention aims to further simplify the valve structure, and its configuration is as follows.

That is, the cap of the present invention is detachably attached to the opening of the filler neck 1 communicating with the surge tank, and has a pressure valve protruding from the inside thereof. A valve chamber 2 is provided in the center of the inner surface of the cap body 3. The valve chamber 2 is formed in the shape of an inverted pot, and its opening is fixed in a watertight manner by a lower lid portion 4. The peripheral edge of the lower lid part 4 is pressed against the stepped part 5 of the filler neck 1 in a watertight manner. Furthermore, a relatively small first valve hole 6 is opened in the center of the lower lid part 4, and a communication hole 7 is formed in the side wall of the valve chamber 2. Further, a positive pressure valve 8 is connected to the first valve hole 6 by a leaf spring 9.
The valve chamber 2 is freely closed and opened from the inner surface via the valve chamber 2. One end of the leaf spring 9 is fixed to the positive pressure valve 8, and the other end is fixed to the inner wall of the valve chamber 2.
Further, a second valve hole 10 is passed through the center of the positive pressure valve 8, and a negative pressure valve 11 is attached to the lower surface of the second valve hole 10 so as to be openable and closable. The negative pressure valve 11 is urged upward via a valve stem 12 fixed thereto.

[Example of idea]

Next, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a schematic vertical cross-sectional view of the cap of the present invention. FIG. 2 shows the main part thereof and is an enlarged view of the part shown in FIG. 1.

In this embodiment, a boss portion 18 is fixed to the center of the cap body 3, and a valve chamber 2 is provided on the inner surface of the boss portion 18 through a disc spring 16 and a sleeve-like rubber 17 so as to be able to move up and down slightly. The valve chamber 2 is formed in the shape of an inverted pot, and a lower lid portion 4 is brazed and fixed to the lower opening thereof. A rubber gasket 19 is provided on the periphery of the lower lid portion 4, and the gasket 19 is pressed against the stepped portion 5 of the filler neck 1 to form a watertight structure between the valve chamber 2 and the filler neck 1. do. A relatively small first valve hole 6 is opened in the center of the lower lid portion 4, and a positive pressure valve 8 made of an elastic sealing material such as rubber is attached to the opening so as to be openable and closable. A second valve hole 10 is provided in the center of the positive pressure valve 8 as shown in FIG.
The valve rod 12 is inserted into the second valve hole 10, and
A negative pressure valve 11 is provided at the lower end of the valve stem 12. A coil spring 13 is interposed between the upper flange portion of the valve stem 12 and the upper surface of the positive pressure valve 8, and urges the negative pressure valve 11 to a closed state. Also, positive pressure valve 8
is provided with one end of a leaf spring 9, and the other end of the leaf spring 9 is fixed to the inner peripheral surface of the valve chamber 2, as shown in FIG. Note that the plate spring 9 and the valve chamber 2 may be fixed by rivets, welding, or the like.

Next, a communication hole 7 is formed in the circumferential surface of the valve chamber 2 . Further, a pipe 14 is provided on the outer peripheral surface of the filler neck 1, and the open end of the pipe 14 is communicated with a surge tank (not shown) via a hose (not shown).

[Effect]

When the coolant circulating between the engine and the heat exchanger becomes high temperature, the coolant expands and the tank 15
The internal pressure increases. Then, the positive pressure valve 8 is pushed up and the expanded cooling water flows into the communication hole 7 and the pipe 1.
4 to the surge tank. Next, when the engine stops and the cooling water in the tank 15 cools and contracts, the inside of the tank 15 becomes negative pressure, and the second
In the figure, the negative pressure valve 11 moves downward to open the second valve hole 10. Then, the cooling water in the surge tank passes through the pipe 14 and the communication hole 10 to the second valve hole 1.
It returns to the tank 15 from 0.

[Effect of idea]

The cap of the present invention has the above structure and has the following effects.

The cap of the present invention has a relatively small first valve hole 6 opened in the center of the lower lid part 4, and the opening is secured by a leaf spring 9 so that it can be opened and closed from the inside of the valve chamber 2 by a positive pressure valve 8. It is energizing. And leaf spring 9
One end of the valve is fixed to the positive pressure valve 8, and the other end is fixed to the inner wall of the valve chamber 2. Furthermore, positive pressure valve 8
A second valve hole 10 is passed through the center of the valve, and a negative pressure valve 1 is inserted therein.
1 is fitted in such a way that it can be opened and closed, and it is urged upward. Therefore, the present invention has an extremely simple structure in which the entire positive pressure valve 8 including the negative pressure valve 11 is supported by the leaf spring 9, and the entire cap is simplified and can be provided at low cost. Moreover, since the positive pressure valve 8 only needs to open and close the relatively small first valve hole 6, the design of the positive pressure valve 8 including the leaf spring 9 itself that supports it becomes easy.

[Brief explanation of the drawing]

Figure 1 is a schematic vertical cross-sectional view of the cap of the present invention;
The figure is a vertical sectional view of the main part of the same cap, and is an enlarged view of the part shown in FIG. 1...Filler neck, 2...Valve chamber, 3...Cap body, 4...Lower lid part, 5...Stepped part, 6
...First valve hole, 7...Communication hole, 8...Positive pressure valve, 9
...Plate spring, 10...Second valve hole, 12...Negative pressure valve, 12...Valve stem, 13...Coil spring, 14...
...Pipe, 15...Tank, 16...Disc spring, 1
7...Sleeve-shaped rubber, 18...Boss part, 19...
...Patsukin.

Claims (1)

[Scope of utility model registration request] The cap of the heat exchanger tank is removably attached to the opening of the filler neck 1 that communicates with the surge tank, and has a pressure valve protruding from the inside. The valve chamber 2 is provided at the center of the inner surface of the cap body 3, and when the cap body 3 is attached, the lower lid part 4
The peripheral edge of the filler neck 1 is formed so as to be watertightly pressed against the stepped portion 5 of the filler neck 1, and a relatively small first valve hole 6 is opened in the center of the lower lid portion 4. A communication hole 7 is formed in the side wall, and the first valve hole 6 is connected to the positive pressure valve 8 from inside the valve chamber 2.
One end of the leaf spring 9 is fixed to the positive pressure valve 8, and the other end is fixed to the inner wall of the valve chamber 2. A negative pressure valve 11 is attached to the lower surface of the second valve hole 10 so as to be openable and closable, and the negative pressure valve 11 is urged upward via a valve stem 12 fixed thereto. A heat exchanger tank cap characterized by: