JPH0678044U - Fuel cutoff valve - Google Patents

Abstract

(57) [Abstract] [Purpose] Improving sealing performance [Constitution] A valve body 2 having a communication passage 7 formed therein, and a float 3 provided inside the valve body 2 so as to be vertically movable by a biasing member 4. And a projection 6 provided on the float 3
In the fuel cutoff valve 1 that opens and closes the first through hole 9 communicating with the communication passage 7, the recess 5 is provided in the center of the upper surface of the float 3, and the projection 6 is provided on the bottom surface of the recess 5. A fuel cutoff valve in which a first communication hole 9 is opened at a lower end and a communication cylinder 8 that hangs down in the recess 5 is connected to the communication passage 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel cutoff valve, and more particularly to a fuel cutoff valve having an improved sealing property.

[0002]

[Prior Art and Problems to be Solved]

 Generally, in a gasoline tank of a vehicle such as an automobile, a fuel cutoff valve 51 as shown in FIG. 4 is used in order to prevent the gasoline stored inside from leaking to the outside when the vehicle falls.

In the fuel cutoff valve 51, a float 53, which is a cutoff valve located at an upper position by a spring 54, is vertically movably housed inside a valve body 52, and a protrusion provided on an upper surface of the float 53. 56 opens and closes the first through hole 59 which communicates with the communication passage 57, and the side of the valve body 52 is provided with an escape passage 60 which communicates with the communication passage 57 from the lower surface. A relief valve 62, which is a steel ball that opens and closes a second through hole 61 that connects the escape path 60 and the interior of the gasoline tank, is provided inside the escape path 60 by a spring 63. Is arranged in a closed state.

The upper end of the escape passage 60 is closed by a lid member 64, the lower end of the valve body 52 is closed by a lid member 65, and a hole 66 is formed in the center of the lid member 65. ing.

The fuel cut-off valve 51 configured as described above is formed at the peripheral portion of the central portion of the valve body 52, with the lower end portion of the valve body 52 located in the hole provided in the gasoline tank. The flange portion 67 is attached by fixing it to the wall surface 69 of the gasoline tank via the packing 68.

As shown in FIG. 4, usually, the projection 56 on the upper surface of the float 53 is separated from the first through hole 59, and the relief valve 62 closes the second through hole 61 of the escape passage 60. It is in the state of doing.

In such a state, as shown in FIG. 5, when the vehicle body such as an automobile is inclined by a predetermined angle or more and the liquid level of gasoline rises to the first through hole 59, the float 53 itself. Buoyancy and the action of the spring 54, the protrusion 56 on the upper surface of the float 53 blocks the first through hole 59 to block the flow of gasoline, and the internal pressure of the gasoline tank is high. In the event that the pressure drops, the relief valve 62 rises against the spring 63 and opens the second through hole 61 to prevent the pressure from rising.

However, in the fuel cutoff valve 51, the float 53 floated by the buoyancy of the float 53 and the action of the spring 54 closes the first through hole 59 with the projection 56 on the upper surface thereof to prevent the outflow of gasoline. Therefore, as shown in FIG. 6, the vehicle swings, and the liquid level of gasoline in the gasoline tank is prevented from coming into contact with the first through hole 59 and the protrusion 56 of the fuel cutoff valve 51 as shown in FIG. In the case where the position of the seal portion of the float 53 is instantaneously reached, the float 53 rises by buoyancy, and before the protrusion 56 of the float 53 closes the first through hole 59, gasoline reaches the position of the seal portion. There was a problem that gasoline reached the outside as shown by the arrow.

In addition, at the time of tipping over, due to the inclination of the float 53, the sealing portion between the first through hole 59 and the protrusion 56 is displaced, the sealing performance is impaired, and there is a problem that gasoline leaks.

The present invention solves the above-mentioned problems of the conventional one, and an object thereof is to provide a fuel cutoff valve in which gasoline does not leak when the vehicle swings or falls. Is.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a valve body having a communication passage formed therein, and a float disposed inside the valve body so as to be vertically movable by a biasing member. In the fuel cut-off valve in which the projections open and close the first through hole that communicates with the communication passage, a recess is provided in the center of the upper surface of the float, and the projection is provided on the bottom surface of the recess, and the first through hole is A means is adopted in which a communication cylinder that opens at the lower end and that hangs down in the recess is communicated with the communication passage.

[0012]

[Action]

 By adopting the above-mentioned means, this invention causes the gasoline to collect in the concave portion of the float and flow out to the outside through the communication tube and the communication path even if the liquid level of the gasoline rises instantaneously when the vehicle swings. There is no fear.

Further, when the vehicle falls, the float descends due to its own weight and the urging force of the spring, the projection blocks the first through hole to prevent the outflow of gasoline, and the air in the recess of the float is prevented. However, when the vehicle falls, it is trapped between the float and the valve body to form an air pool, and the projection and the first through hole seal part is located in this air pool. Even if there is a slight deviation from the first through hole, this air trap prevents the gasoline from leaking.

[0014]

【Example】

 An embodiment of the present invention shown in the drawings will be described below. 1 to 3 show an embodiment of a fuel cutoff valve according to the present invention, FIG. 1 is a schematic sectional view of the entire fuel cutoff valve, and FIG. 2 is an overall view showing the fuel cutoff valve during rocking. FIG. 3 is a schematic cross-sectional view, and FIG. 3 is an overall schematic cross-sectional view showing the fuel cutoff valve at the time of falling.

That is, in this fuel cutoff valve 1, a float 3 which is a cutoff valve which is located above a valve main body 2 in which a communication passage 7 is formed and which is positioned upward by a spring 4 is vertically movable. It is stored.

A recess 5 is formed in the center of the float 3, and a projection 6 is formed on the bottom surface of the recess 5.

A communication cylinder 8 communicating with the communication passage 7 from the inner upper surface of the valve body 2 hangs in the recess 5 formed in the float 3, and the communication passage 8 is connected to the tip of the communication cylinder 8. A first through hole 9 communicating with 7 is formed, and the first through hole 9 opens in the recess 5.

The protrusion 6 provided on the float 3 opens and closes the first through hole 9 communicating with the communication passage 7 by the vertical movement of the float 3.

A relief passage 10 is provided on the side of the valve body 2 so as to communicate with the communication passage 7 from the lower surface. Inside the relief passage 10, the relief passage 10 communicates with the inside of the gasoline tank. A relief valve 12, which is a steel ball that opens and closes the second through hole 11, is provided in a state in which the second through hole 11 of the escape passage 10 is closed by a spring 13.

The upper end of the escape passage 10 is closed by a lid member 14, the lower end of the valve body 2 is closed by a lid member 15, and a hole 16 is formed in the center of the lid member 15. Has been done.

Next, the operation of the fuel cutoff valve 1 configured as described above will be described. This fuel cutoff valve 1 has a flange portion 17 formed on the peripheral portion of the central portion of the valve body 2 with a packing 18 in between with a lower end portion of the valve body 2 being positioned in a hole provided in a gasoline tank. It is attached by fixing it to the wall surface 19 of the gasoline tank.

As shown in FIG. 1, normally, the projection 6 formed on the bottom surface of the recess 5 of the float 3 is separated from the first through hole 9 and the relief valve 12 is provided with the second passage of the escape passage 10. The hole 11 is closed.

In such a state, as shown in FIG. 2, when the vehicle rocks, the liquid level of the gasoline rises up to the hole provided in the gasoline tank at the peak, and at this time, the gasoline is released from the valve. It flows into the valve body 2 through the hole 16 of the lid member 15 attached to the lower portion of the body 2, and passes between the valve body 2 and the float 3 to flow into the recess 5 provided in the float 3 as shown by the arrow. .

However, since the upper surface of the float 3 is located below the inner peripheral surface of the valve body 2, even if the recess 5 is filled with gasoline, this gasoline will pass through the communication cylinder 8 and the communication passage 7. There is no fear of leaking to the outside.

When the entire float 3 is immersed in gasoline, the float 3 rises due to the buoyancy of the float 3 and the urging force of the spring 4, and the projection 6 closes the first through hole 9 of the communication tube 8 to let out gasolin. Prevent.

Then, as shown in FIG. 3, when the vehicle falls, the float 3 descends due to its own weight and the biasing force of the spring 4, and the projection 6 closes the first through hole 9 to prevent the outflow of gasoline. Stop.

Further, at the time of tipping, the air in the concave portion 5 of the float 3 is trapped between the float 3 and the valve body 2 to form an air reservoir 20. Since the seal portion with the first through hole 9 is located, even if the seal portion is displaced due to the inclination of the float 3, the sealing performance is not deteriorated and the leakage of gasoline can be prevented.

In the above case, the inside of the recess 5 may be filled with gasoline and no air may be present in the recess 5, but in the process from FIG. 2 to FIG. Part of the gasolin flows out from the recess 5, whereby air is located in the recess 5 and the air forms the air reservoir 20 shown in FIG. 3 by the air.

When the internal pressure of the gasoline tank becomes high, the relief valve 12 ascends against the spring 13 and opens the second through hole 11 to prevent the pressure increase, as in the conventional case. To do.

[0030]

[Effect of device]

 With this configuration, even if the vehicle swings and the gasoline liquid level rises instantaneously, the gasoline accumulates in the recess of the float and flows out to the outside through the communication cylinder and the communication path. There is no fear of doing

Further, even if the vehicle falls, the float descends due to its own weight and the urging force of the urging member, the projection blocks the first through hole to prevent the outflow of gasoline, and the float and the valve body Since an air pocket is formed between the and, and the seal part is located inside this air pool, even if the seal part shifts due to the inclination of the float, the sealing performance does not deteriorate and it is possible to prevent leakage of gasoline. That is, it has an excellent effect.

[Brief description of drawings]

FIG. 1 is an overall schematic cross-sectional view showing an embodiment of a fuel cutoff valve according to the present invention.

FIG. 2 is an overall schematic cross-sectional view showing a state of a fuel cutoff valve according to the present invention when it is rocking.

FIG. 3 is an overall schematic cross-sectional view showing a state of the fuel cutoff valve according to the present invention when it falls.

FIG. 4 is an overall schematic cross-sectional view showing a conventional fuel cutoff valve.

FIG. 5 is an overall schematic sectional view showing a state in which a conventional fuel cutoff valve is tilted.

FIG. 6 is an overall schematic cross-sectional view showing a state when a conventional fuel cutoff valve is rocking.

[Explanation of symbols]

 1, 51 ...... Fuel cutoff valve 2, 52 ...... Valve body 3, 53 ...... Float 4, 13, 54, 63 ...... Spring 5 ...... Recess 6,56 ...... Protrusion 7, 57 ...... Communication passage 8 ...... Communication cylinder 9,59 ...... First through hole 10,60 ...... Escape passage 11,61 ...... Second through hole 12,62 ...... Relief valve 14, 15, 64, 65 ...... Lid member 16, 66: Hole 17, 67: Flange 18, 68: Packing 19, 69: Gasoline tank wall 20: Air reservoir

Claims (1)

[Scope of utility model registration request] 1. A valve body (2) having a communication passage (7) formed therein, and a float (3) disposed in the valve body (2) so as to be vertically movable by a biasing member (4). In the fuel cut-off valve (1), the projection (6) provided on the float (3) opens and closes the first through hole (9) communicating with the communication passage (7). A recess (5) is provided in the center of the upper surface, and the projection (6) is provided on the bottom of the recess (5) so that the first through hole (9) opens at the lower end and the inside of the recess (5) is A fuel cut-off valve, characterized in that a hanging communication tube (8) is communicated with the communication passage (7).