JPH0519651Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a check valve that controls the opening and closing of an elastic material arranged in correspondence with the seat hole by changing the pressure applied to the elastic material.
This check valve is often used as a check valve on the suction side of a fuel pump, a check valve on the discharge side, or a check valve for preventing air leakage from the nozzle of a carburetor.

[Conventional technology]

Conventionally, a commonly used check valve is formed by punching a base material made of an elastic material using a press die, and the check valve is disposed in opposition to a seat hole.

More specifically, the elastic material itself is stored in a rolled state, and this roll is unwound and then placed on a press and punched out. According to this, the check valve itself may be manufactured with various bends or warps. That is, when the rolls are stored, the elastic material becomes bent, which cannot be corrected.

[The problem that the idea aims to solve]

According to such conventional check valves, as described above, the check valves are unstable and have many types of bends and warps, which results in unstable seating properties in the seat holes, which can lead to seat defects.

This is particularly noticeable when there is no spring that closes and holds the seat hole using the elastic force of the check valve itself.

[Means to solve the problem]

The check valve of the present invention has been developed in view of the above problems.In order to improve the seating properties of the check valve with respect to the seat hole, the check valve has one end fixed and the other end free. In the check valve arranged correspondingly to X-X, and the longitudinal line connecting the fixed end 7A and free end 7B of the check valve is Y.
-Y, the release direction line X-X and the longitudinal direction line Y-Y are aligned, and the longitudinal direction line Y
This is a check valve that is punched and formed so that the cross section along -Y is semicircular.

[Effect]

According to this check valve, when one end of the check valve is tightened to form a fixed end 7A and the other end is set as a free end 7B and is arranged opposite to the seat hole, the check valve itself will reverse the seat hole by its elastic force. At this time, since the cross section along the longitudinal line Y-Y connecting the fixed end 7A and free end 7B of the check valve could be made semicircular, it could be held against the seat hole. This ensures that the surface of the check valve is pressed and improves the seating properties.

〔Example〕

Hereinafter, one embodiment of the check valve according to the present invention will be described with reference to the drawings.

In this embodiment, a nozzle hole of a carburetor is used as a check valve, and 1 is a carburetor main body through which an intake passage 2 passes, and a nozzle hole 3 opens into the intake passage 2. On the other hand, in the lower concave portion of the intake passage 2 of the carburetor body 1, there is a seat plate 5 with a seat hole 4 bored therein, and a seat plate 5 with a seat hole 4 formed therein.
A check valve 7 made of an elastic material and having one end fastened to the screw 6 and the other end free is disposed in opposition to the check valve 7.

The seat plate 5 and the check valve 7 separate the fuel inflow chamber 8 and the fuel outflow chamber 9.
The nozzle hole 3 communicates with the fuel outflow chamber 9.

The above is the structure of a conventionally known check valve, and the check valve 7 according to the present invention is formed as follows.

That is, when the check valve 7 is punched and formed, the cross section along the longitudinal direction line Y-Y connecting the fixed end 7A and the free end 7B of the check valve 7 has a semicircular shape as shown in FIGS. 2 and 3. It is formed in a shape (R-shape). This bending process is performed as follows.

Reference numeral 10 denotes an elastic material as a base material forming the check valve 7, which is wound into a roll and stored. This elastic material 10 is unrolled when the check valve 7 is formed, and is wound to one side to have an open end 10A.

Next, the winding release direction X-X line at the winding release end 10A of the base material 10 and the check valve 7
A longitudinal line Y connecting the fixed end 7A and the free end 7B of
The check valve 7 is punched out from the base material 10 in a state where -Y is substantially parallel to the base material 10.

According to this, the fixed end 7A of the check valve 7
The cross section along the longitudinal direction line Y-Y connecting the free end 7B and the free end 7B can have a semicircular shape (R shape). This is because the elastic material that has been stored in a roll is unwound and the elastic material has a tendency to curve toward the center of the roll. (Fig. 4, 5
As shown in the figure. ) Then, the side portion 7 of the check valve 7 formed by punching into a semicircular shape has a small radius of curvature.
C is placed in opposition to the seat hole 4.

According to such a check valve 7, when the check valve 7 is placed in the seat hole 4, the side portion 7C having the smaller radius of curvature is brought into contact with the seat hole 4, so that the check valve 7 is held pressed against the seat hole 4.

Therefore, the seat surface pressure of the check valve 7 to the seat hole 4 can be increased.
can significantly improve sheeting properties.

[Effect of idea]

As described above, according to the check valve of the present invention, it is possible to improve the seating properties of the seat hole by the elastic force of the check valve itself, and by improving productivity, it is possible to improve the seating properties of the carburetor and fuel pump. This made it possible to reduce product costs.

[Brief explanation of the drawing]

The attached drawings show one embodiment of the check valve according to the present invention. Fig. 1 is a longitudinal sectional view showing the check valve installed in a carburetor, and Fig. 2 is a perspective view showing the check valve in its free state. , FIG. 3 is a vertical sectional view taken along the - line in FIG. 2, FIG. 4 is a state diagram showing a state in which the elastic material wound in a roll as the base material of the check valve is released to one side, and FIG. is a plan view seen from above in FIG. 4; 4... Seat hole, 7... Check valve, 7A
... Fixed end, 7B ... Free end, 7C ... Side portion with small radius of curvature, 10 ... Base material as elastic material,
10A... Winding release end.

Claims (1)

[Scope of utility model registration request] In a check valve in which one end is fixed and the other end is a free end and is arranged corresponding to the seat hole, the elasticity has a tendency to bend toward the center of the roll as a result of unwinding the roll. If the unwinding direction line at the winding unwinding end 10A of the base material 10 of the material is X-X, and the longitudinal direction line connecting the fixed end 7A and free end 7B of the check valve is Y-Y, then the above-mentioned unwinding direction The check valve is punched and formed so that the line XX and the longitudinal direction line Y-Y are aligned and the cross section along the longitudinal direction line Y-Y has a semicircular shape.