JPH0443665Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention has a structure in which the valve is in contact with the upper valve seat when the valve is closed, and the lower surface of the valve is in contact with the upper surface of the lower wall of the valve seat when the valve is opened. The valve structure is such that the lower surface of the valve, which is in contact with the upper surface of the lower wall during valve operation, seals around the valve rod.

(Prior art) As shown in FIG. 4, a fuel gas discharge pipe b and a valve seat c constituting the opening of the discharge pipe b are provided in the upper part of the fuel tank a, and the valve seat c is provided on the lower surface of the valve seat c. A valve chamber d surrounding the lower part is constituted by a surrounding wall e and a lower wall f, and a valve g that presses against the valve seat c by elastic protrusions is arranged in the valve chamber d. A valve rod h that can freely slide is provided, a second valve seat i is formed on the side of the valve rod h on the lower wall f, and a second valve seat i is formed in the lower part of the valve seat i by the rise of the fuel surface W of the fuel tank a. The valve structure was equipped with a floating float valve j.

(Problem to be solved by the invention) In the above method, the valve g is opened away from the valve seat c in conjunction with the refueling of the fuel tank a using a refueling gun, and the fuel level W rises at the end of refueling. In relation to this, the float valve j is floated to close the second valve seat i, and even if the valve g is open, fuel gas does not enter the valve chamber d from the second valve seat. As a result, the fuel gas in the upper layer of the fuel tank is compressed by the fuel surface W, which continues to rise, and by this compression, the amount of fuel flowing in is regulated and the tank is so-called full, and then This removes the refueling gun and prevents refueling.
Since the valve rod h passing through the lower wall f is not sealed, even if the second valve seat i is closed by the float valve j, the fuel gas in the upper layer of the fuel tank is not sealed by the valve rod h.
Since the fuel flows into the valve chamber d from around the fuel tank and escapes into the discharge pipe b, this has the disadvantage of slowing down the compression speed of the upper layer of the fuel tank a and replenishing the fuel above the designed value. Also, the valve lever h shown in Figure 5
In valve structures in which an O-ring r is fitted between the valve insertion tube and the valve insertion tube to seal around the valve stem h, the disadvantage is that the frictional resistance caused by the O-ring r becomes large and the valve stem does not slide smoothly. arise. The present invention aims to solve these drawbacks.

(Means for Solving the Problems) The present invention aims to solve the problems mentioned in the previous section, and includes providing a fuel gas discharge pipe with a valve seat as an opening in the upper part of the fuel tank.
A valve chamber surrounding the lower surface of the valve seat is provided, and a valve is provided that closes in contact with the valve seat or in contact with a lower wall of the valve chamber, and a valve rod of the valve is attached to the lower wall. In a configuration in which a second valve seat is provided on the side of the valve rod, and a float valve is provided on the valve seat that floats up and comes into contact with the rise of the fuel level of the fuel tank, the valve on the lower surface of the valve The present invention relates to a double-sided seal type valve characterized in that a seal ring is formed around the rod to contact the lower wall when the valve is opened. A preferred embodiment of the invention will now be described.

(Embodiment) As shown in FIGS. 1 and 2, a bracket 7 is attached to the top of the fuel tank 1, which is provided with a fuel gas discharge pipe 4 and a valve 5 for opening and closing the valve seat 8 of the discharge pipe 4. A pipe 6 such as a copper pipe inserted and fixed into the fuel tank 4 is guided to a coal canister (not shown), and is ultimately supplied to the engine along with the fuel in the fuel tank 1 supplied by the fuel pump. A second bracket 10 having a plate part 11 forming a valve chamber 9 is attached to the bottom surface of the discharge pipe 4 below the valve seat 8, and a valve is inserted into the plate part 11 so as to match the valve seat 8 at the top and bottom. A tube 13 and a second valve seat 14 on its side are provided, and the second bracket 10
A second valve seat 1 is mounted on a support plate 12 fixed to the bottom of the valve seat 1.
4, a support box 16 containing a corresponding float valve 15 is attached. Reference numeral 17 denotes a fuel inlet/outlet provided on the side and bottom plate of the support box 16.

In the lower wall of the valve chamber 9, the valve rod 18 of the valve 5 is slidably passed through the valve insertion tube 13, and the valve 5 is closed by elastically contacting the valve seat 8 with the push-up spring 19 as shown in FIG. Valve rod 18 protruding from the lower surface of the plate portion 11
In this case, one end of an inner cable 21 passed through an outer cable 22 whose one end is fixed to a support plate 12 is connected via a buffer spring 20.

Supply port 3 of supply pipe 2 protruding from fuel tank 1
As shown in FIG.
A support plate 26 is provided which is inserted substantially parallel to the support plate 26, and a shaft 27 at the upper part of the support plate 26 pivotally supports and further supports a rocking plate 28 which closes the opening 25 of the replenishment port 3 through which the refueling gun G passes from the lower surface. Axis 2 of the middle part of the plate 26
9 pivots the center of the lever 30 in the longitudinal direction,
The lower surface of the swing plate 28 and one end of the lever 30 are connected by a link 31. Further, the outer cable 22 is passed through the fuel tank 1 at the lower end of the support plate 26.
Secure the other end.

If the valve rod 18 is not sealed between the plate portion 11 forming the lower wall of the valve chamber 9 and the valve insertion pipe 13, fuel gas will flow through the valve rod 18 and enter the valve chamber 9, and the valve seat 8 will be opened. This causes something to escape into the discharge pipe 4, and the compression of the fuel gas is delayed even if the fuel liquid level W is still above.

In the present invention, a seal ring 41 surrounding the valve rod 18 is provided on the lower surface of the valve 5, and the seal ring 41 substantially forms the lower wall of the valve chamber 8 on the upper surface of the valve insertion tube 13 of the plate part 11. buffer spring 20
The lower surface of the valve 5 and the valve rod 1 contact each other due to their elasticity.
Seal 8.

(Function) This invention closes the valve by contacting the valve 5 with the valve seat 8 as shown in Fig. 2, or closes the valve 5 as shown in Fig. 3.
to open the valve seat 8. At that time, the valve seat 8 is opened.
The seal ring 41 on the lower surface of the valve rod 18 is sealed by contacting the upper surface of the valve insertion tube 13 of the plate part 11 which is the bottom wall of the valve chamber 9.

(Effects) The present invention has a valve rod on the lower surface of the valve 5 that closes the valve in contact with the valve seat 8 by controlling the movement in one direction, and opens the valve in contact with the lower wall of the valve chamber 9 by controlling the movement in the other direction. Since the sealing ring 41 is provided around the valve rod 18, the valve rod 18 can be sealed when opening and closing, thereby producing a double-sided sealing effect.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, Figure 1 is a longitudinal side view, Figure 2 is an enlarged longitudinal sectional view showing the valve closed, and Figure 3 is an enlarged longitudinal sectional view showing the valve opened. . 4 and 5 are longitudinal sectional side views of a conventional valve. 1... Fuel tank, 4... Discharge pipe, 5... Valve, 8... Valve seat, 11... Plate, 13... Valve insertion tube, 14... Second valve seat, 15... Float valve, 18...Bench, 31...Link.

Claims (1)

[Claims for Utility Model Registration] A fuel gas discharge pipe having a valve seat as an opening is provided in the upper part of the fuel tank, a valve chamber surrounding the valve seat is formed on the lower surface of the valve seat, and the above-mentioned gas discharge pipe is provided in the valve chamber. A valve that closes in contact with the valve seat or opens in contact with the lower wall of the valve chamber is provided, the valve rod of the valve is slidably passed through the lower wall, and a second valve is provided on the side of the valve rod. In a configuration in which a float valve is provided that floats up and contacts the valve seat as the fuel level of the fuel tank rises, a seal is provided around the valve rod 18 on the lower surface of the valve 5 that contacts the lower wall when the valve is opened. A double-sided seal type valve characterized by forming a ring 41.