JPH0311598Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention mainly relates to a joint part of a filler neck that constitutes a water supply port of a heat exchanger for cooling engine cooling water, and in particular, the neck part of the filler neck is connected to a pressure valve 2. It relates to what constitutes the valve seat surface.

[Prior art]

Heat exchangers for cooling water in automobile engines are
A filler neck that constitutes a water supply port is connected to the upper tank. This filler neck had a stepped neck-like lower end, and the neck was inserted into the opening of the upper tank, and the insertion portion was fixed by brazing. A cap was fitted into the upper opening of the filler neck, and the pressure valve 2 attached to the lower center surface of the cap was configured to abut against the inner edge of the neck of the filler neck.

[Problem to be solved]

However, since the joint between the filler neck and the upper tank is joined by hard brazing, the neck deforms unevenly due to the heating during brazing, and the pressure valve that comes into contact with the neck deforms unevenly. There were times when it was difficult to keep the pressure at the desired value. Furthermore, since flux is used during brazing, residual components of the flux sometimes corrode the brazed portion of the filler neck. As a result, there was a risk that the life of the heat exchanger tank would be shortened.

[Means for solving problems]

Therefore, the present invention adopts the following configuration in order to eliminate the above problems.

That is, the lower end opening edge of the tank body 1 is joined to the peripheral edge of the tube plate 6, the filler neck 14 is fluid-tightly joined to the hole 7 on the upper surface of the tank body 1, and the upper end opening on the filler neck 14 is connected to the hole 7 on the upper surface of the tank body 1. A pressure valve 2 is removably installed inside. Then, a valve seat surface 3 is formed on the inner edge of the neck portion 4 of the filler neck 14, with which the lower surface of the pressure valve 2 comes into contact. Here, the feature of the present invention is that the neck portion 4 is inserted into the hole edge of the tank body 1 via a packing 5 or an O-ring.
The lower end or the peripheral edge thereof is plastically deformed by caulking and joined to the hole 7.

Therefore, according to this joint, thermal deformation of the valve seat surface 3 due to brazing and corrosion caused by flux can be prevented as in the conventional case.

〔Example〕

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

FIG. 1 is a vertical sectional view of the main part of the filler neck joint of the present invention, showing the state in which the cap 8 is removed from the filler neck 14, and the fifth
The drawing shows a state in which the cap 8 is fitted onto the filler neck 14, and is a schematic cross-sectional view taken along the - arrow in FIG.

In this embodiment, the filler neck 14 consists of a short cylindrical body having a stepped portion at the lower end, and the pipe 13 is fixed to the side wall thereof by brazing. A neck portion 4 having a diameter smaller than the diameter of the upper end opening is previously formed into a cylindrical shape. Next, this neck portion 4 is inserted into a hole 7 formed in the upper end surface of the tank body 1. At the same time, an annular rubber packing 5 is interposed between the stepped lower surface of the filler neck 14 and the edge of the hole 7. Next, the neck 4 is fluid-tightly joined to the hole 7 by caulking the lower edge of the neck 4 outward in the radial direction and plastically deforming it. The tank body 1 may be plastically deformed by pressing the upper and lower surfaces of the neck of the filler neck 14 by a press or the like while the lower end thereof is open. At this time, the neck 4
Since the upper edge of constitutes the valve seat surface 3,
The stepped portion or the valve seat surface 3 is supported or pressed so that the valve seat surface 3 becomes a uniform surface during caulking.
Preferably, the valve seat surface 3 is supported so as to have a curved surface with no cut portions. Note that when caulking the lower edge of the neck portion 4, first bend the lower edge outward and then insert the lower edge into the tank body 1 from the vertical direction.
Just fold it towards the inside. After joining the filler neck 14 to the tank body 1 in this way,
The bottom opening edge of the tank body 1 is connected to the tube plate 6.
Braze and fix to the periphery of the Then, a cap 8 is fitted into the upper end opening of the filler neck 14, and a pressure valve 2 is provided at the center of the cap 8.
is pressed against the valve seat surface 3 as shown in FIG. This elastic force is provided by a coil spring 11 interposed between the cap 8 and the pressure valve 2. Further, a negative pressure valve 10 is provided at the center of the pressure valve 2, and the negative pressure valve 10 applies pressure to the surface of the pressure valve 2.

[Effect]

The mounting portion of the filler neck 14 formed in this way is in uniform contact with the surface of the pressure valve 2. This is because, since the filler neck 14 and the tank body 1 are joined by caulking, the surface of the valve seat surface 3 can be uniformly maintained in a desired shape using a caulking press or the like. Cooling water heated by the engine flows within the tank body 1 through a pipe (not shown). When the pressure inside the tank body 1 becomes higher than a predetermined pressure, the pressure valve 2 rises as shown in FIG. It flows into a surge tank (not shown). At this time, the opening pressure of the pressure valve 2 is maintained at a desired value because the joint between the pressure valve 2 and the valve seat surface 3 is maintained uniform. Next, the cooling water in the tank body 1 cools down,
When the tank body 1 contracts, the inside of the tank body 1 becomes negative pressure, and the negative pressure valve 10 moves downward, and the negative pressure valve 10 is removed from the surge tank (not shown) through the pipe 13 and the communication hole 12.
It flows into the tank body 1 from around the support shaft 15. In the figure, a lever 9 is provided at the center of the cap 8, and one end of the lever 9 is pivoted so as to maintain the lever 9 in the solid line state and the chain line state, respectively. When the state shown by the chain line is maintained, the pressure valve 2 moves upward and the cap 8 can be easily removed from the filler neck 14.

[Modified example]

Figure 2 shows the second filler neck joint of the present invention.
It is a longitudinal sectional view of a main part showing an example, and in this example, the cross section of the packing 5 is formed in a substantially L-shape,
It comes into contact with the inner surface of the hole 7 of the tank body 1 and the upper peripheral edge of the hole 7. Next, FIG. 3 shows a third embodiment of this joint part, and in this embodiment, the cross section of the annular packing 5 is formed in a J-shape, and the inner surface of the hole 7 of the tank body 1 and the top and bottom of the hole This is to fit the peripheral edge part. Therefore, the gasket 5 in FIGS. 2 and 3 can form a liquid-tight structure more firmly than the gasket 5 in FIG. 1. Note that an O-ring may be used instead of the gasket 5. Furthermore, the packing material 5 is not limited to rubber material, and various conventional packing materials such as synthetic resin materials can be used.

[Effect of idea]

The joint of this invention consists of the above structure,
It has the following effects.

In this structure, the neck 4 of the filler neck is inserted into the hole 7 of the tank body 1 via the packing 5, and the lower end of the neck 4 or its periphery is plastically deformed by caulking, thereby joining the neck 4 and the hole 7. Therefore, unlike conventional brazing joints, thermal deformation does not occur, and a liquid-tight structure between the pressure valve 2 and the valve seat surface 3 can be reliably formed. Furthermore, the presence of the packing 5 ensures liquid tightness between the neck portion 4 and the tank body 1. Further, since the tank body 1 is open at the lower end, the lower end of the neck 4 or its peripheral edge can be easily caulked with the neck 4 inserted into the hole 7. Therefore, a highly productive filler neck joint can be formed. Furthermore, by caulking the lower end portion of the neck portion 4 or its peripheral portion, the valve seat surface 3
can be maintained uniformly over the entire circumference. Thereby, the opening pressure of the pressure valve 2 can be maintained at a desired value, and the reliability of the pressure valve 2 can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the filler neck joint of the present invention, with the cap 8 removed.
Fig. 2 is a vertical cross-sectional view of the main part showing a second embodiment of the joint of the present invention, Fig. 3 is a longitudinal cross-sectional view of the main part of the third embodiment, and Fig. 4 is a heat exchanger having the filler neck joint of the present invention. A schematic plan view showing an example of the vessel, and FIG. 5 is a schematic cross-sectional view taken along the - arrow in FIG. 1...tank body, 2...pressure valve,
3... Valve seat surface, 4... Neck, 5... Packing, 6
...Tube plate, 7 ... Hole, 8 ... Cap, 9 ... Lever, 10 ... Negative pressure valve, 11 ... Coil spring, 12 ... Communication hole, 13 ... Pipe, 1
4...Filler neck, 15...Support shaft.

Claims (1)

[Scope of utility model registration request] A tank body 1 whose lower end opening edge is joined to the peripheral edge of a tube plate 6, a tank body 1 which is fluid-tightly joined to a hole 7 on the upper surface of the main body 1, and a pressure valve 2 is removably installed inside the tank body 1 from the upper end opening. , and a filler neck 14 having a valve seat surface 3, which the lower surface of the valve 2 comes into contact with, on the inner edge of the neck portion 4 formed at the lower end. Filler neck joining of a tank for a heat exchanger, characterized in that the neck portion 4 is inserted into the hole edge via a packing 5 or an O-ring, and the lower end portion or the peripheral edge portion of the neck portion 4 is plastically deformed by caulking and joined to the hole 7. Department.