JPH04108423U - Fuel cutoff valve - Google Patents

Abstract

(57) [Summary] [Purpose] Improved sealing performance [Structure] A valve body 6 is provided with a communication passage 4 that opens to the outside and a relief passage 11 that communicates with the communication passage 4.
A float 8 having a protrusion 7 that can open and close a second passage hole 16 communicating with the communication passage 4 and a first passage hole 10 communicating with the relief passage 11 is disposed inside the valve body 6. A relief valve 1 that can open and close the passage 11
2, and the relief valve 12 and the float 8 are connected by a spring 15. When the protrusion 7 of the float 8 closes the first and second through holes 10 and 16, the pressure inside the valve body 6 flows through the third through hole 17 provided in the first through hole 10. is introduced into the first through hole 10,
It acts on the relief valve 12 to escape.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to fuel cut-off valves, and in particular, to fuel cut-off valves with improved sealing performance. This relates to fuel cutoff valves.

0002

[Prior art and problems to be solved]

Generally used in automobile gasoline tanks, etc., and stored inside when the automobile falls over. In order to prevent the accumulated gasoline from leaking to the outside, the gasoline tank etc. should be equipped with Figure 3. A fuel cutoff valve 31 as shown in is used.

0003 This fuel cut-off valve 31 has a spring inside the valve body 36. The float 38, which is a cutoff valve that is in the upper position due to 33, moves up and down. The float 38 is movably stored, and a protrusion 37 provided on the top surface of the float 38 connects to the communication path 34. The through hole 35 is opened and closed, and the side of the valve body 36 has a bottom surface. A relief passage 41 is provided which communicates with the communication passage 34 from the inside of the relief passage 41. A relief valve 42, which is a steel ball that closes the relief passage 41, is operated by a spring 40. The opening 43 of the escape passage 41 is closed.

0004 Note that the upper end of the escape passage 41 is closed by a lid member 39, and the valve body The lower end of 36 is closed with a lid member 44, and a hole is formed in the center of this lid member 44. 45 is drilled.

[0005] The fuel cutoff valve 31 configured as described above is With the lower end of the main body 36 located in the hole provided in the gasoline tank, insert the valve main body The flange portion 32 formed on the periphery of the central portion of the It can be attached by fixing it to the wall surface 46 of the tank.

[0006] Normally, if the protrusion 37 on the upper surface of the float 38 is away from the through hole 35, In both cases, the relief valve 42 is in a state where the through hole 43 of the relief path 41 is closed. There is.

[0007] In such a state, if the float 38 tilts beyond a predetermined angle, the float 38 It floats up due to its own buoyancy and the action of the spring 33, and the upper surface of the float 38 The protrusion 37 blocks the through hole 35 to prevent the flow of gas. When the internal pressure of the phosphorus tank becomes high, the relief valve 42 is activated by the spring. The opening 40 is raised against the pressure 40 to open the through hole 43 and prevent pressure from increasing.

[0008] However, the conventional fuel cutoff valve 31 is installed in the valve body 36. Screw the flange portion 32 through the packing 47 and cover plate 48. Since the flange portion 32 is attached to the wall surface 46 of the gasoline tank, the rigidity of the flange portion 32 is reduced. Otherwise, the valve body 36 may be deformed due to excessive tightening force. 36 is deformed, the seal at the part of the through hole 43 that the relief valve 42 contacts However, there was a problem in that there were cases where the accuracy of the method was reduced.

[0009] Also, the spring 33 supporting the float 38 and the relief bar, which is a steel ball, are Since the spring constant of the spring 40 that presses the lubricant 42 is large, the spring There is also the problem that the parts 33 and 40 themselves may buckle, making the characteristics unstable. was.

0010 This idea solves the problems of the conventional ones mentioned above and makes the whole thing smaller. A fuel cup that can provide a reliable seal. The purpose of this invention is to provide a to-off valve.

[0011]

[Means to solve the problem]

In order to achieve the above purpose, this invention provides a communication path that opens to the outside and a communication path that opens to the outside. A valve is provided with an escape passage communicating with the passage and has a flange portion on the peripheral edge. a first through hole that communicates between the relief passage and the inside of the valve body; and the relief passage. a relief valve located within the valve body and capable of opening and closing the first passage hole; the float, which is disposed in and a spring connecting between the relief valve and the float. , furthermore, it is opened and closed by the protrusion of the float, and communicates with the inside of the valve body when opened. a second passage hole that communicates with the passageway, and a third passage hole that communicates the first passage hole with the inside of the valve body. and while the protrusion of the float closes the first and second through holes. , when the internal pressure of the valve body rises, this pressure flows forward through the third passage hole. This method employs a method of escaping by opening a relief valve.

0012

[Effect]

By adopting the above-mentioned means, this device can be used when the whole body is tilted more than a certain level. The protrusion on the upper surface of the float closes the second communication hole that communicates with the communication path. During this blockage, if the internal pressure increases, the relief valve will open. The pressure increases and communicates the inside of the body with the relief passage, and therefore the inside of the body and the communication path are communicated with each other via the relief path. Additionally, a spring is installed in tension between the float and the relief valve. The spring is buckled when the float and relief valve moves. There is no risk that this will occur.

[0013]

【Example】

Embodiments of this invention shown in the drawings will be described below.

[0014] Figure 1 shows a fuel cut-off valve according to this invention. The fuel cut-off valve 1 has a flange portion 2 integrally provided at the upper peripheral edge. A cylindrical lower body 3 and an upper opening of this lower body 3 are closed and an external An upper body 5 with an open communication passage 4 provided on the side, and this upper body 5 and the lower body. 3, and a protrusion 7 is integrated in the center of the upper surface. It consists of a float 8 provided.

[0015] In the center of the upper main body 5, there is a recess having a shape corresponding to the protrusion 7. 9 is provided, and a first through hole 10 is bored in the center of this recess 9. 0 communicates with the communication path 4 via a relief path 11.

[0016] Further, a bowl-shaped relief valve 12 is provided inside the relief passage 11. The pin 13 provided on the top surface of the relief valve 12 and the protrusion 7 of the float 8 A spring 15 is disposed under tension between the pin 14 and the pin 14 provided in the holder.

[0017] Furthermore, a second through hole 16 communicating with the communication path 4 is bored in the recess 9, and As shown in FIG. 2, the first through hole 10 does not communicate with the second through hole 16. , one or more third through holes 17 communicating with the inside of the valve body 6 are bored.

[0018] Note that the upper end of the escape passage 11 is closed with a lid member 18, and the lower part of the lower body 3 is closed. A hole 19 is provided at the end.

[0019] Next, the operation of the above will be explained. First, the valve body is inserted into the hole drilled in the wall of the gasoline tank, similar to the conventional one. With the lower end of 6 in place, insert the flange part 2 into the packing 20 and cover plate. It is fastened to the wall of the gasoline tank with a screw through the hole 21.

[0020] In this case, the part constituting the relief valve is the flange portion 2 of the valve body 6. Since it is provided at the top of the valve body 6 instead of the valve body 6, even if the flange part 2 is tightened Therefore, there is no risk that the escape passage 11, the first through hole 10, and the recess 9 will be deformed. There is no risk of deformation.

[0021] The fuel cut-off valve 1 tightened as described above is under normal conditions. The inside of the lub body 6 communicates with the outside via the second through hole 16 and the communication path 4, and The valve 12 opens the first through hole 10 by gravity and the tensile force of the spring 15. It's blocked.

[0022] During operation, the float 8 resists the tensile force of the spring 15. , or move up and down in sequence, and when the whole float is tilted, the float 8 itself The float 8 rises due to the buoyancy of the float and the action of the spring 15, and the The girder protrusion 7 is located in the recess 9 and closes the first through hole 10 and the second through hole 16. Therefore, through the inside of the gasoline tank, the inside of the valve body 6, and the communication passage 4, All communication with the outside world is reliably blocked.

[0023] With the communication with the outside blocked in this way, the interior of the gasoline tank is When the pressure is increased, this pressure is released through the third through hole 17 and the first through hole 10. This acts on the relief valve 12 and causes the relief valve 12 to resist the spring 15. As a result, the pressure increases through the first passage hole 10, the relief passage 11, and the communication passage 4. They are supposed to escape through it.

[0024] During the above operation, the float 8 and the relief valve 12 are operated by one spring. Since they are connected by ring 15, movement of float 8 and relief valve 12 is possible. There is no possibility that the spring 15 will buckle depending on the situation.

[0025] Further, a protrusion 7 is provided at the center of the upper surface of the float 8, and a recess 9 is also provided on the upper body 5. Since it is provided in the center of the float 8, it is securely sealed even when the float 8 rotates. In addition, the well-balanced float 8 ensures stable sealing performance at all times. I can do it.

[0026]

[Effect of the idea]

Because this device is configured as described above, deformation of the component parts occurs during installation. There is no risk of damage, and stable sealing performance can be ensured at all times. The springs used are tensioned rather than compressed, so buckling does not occur. This makes the spring characteristics stable.

[0027] In addition, a relief valve is provided at the top of the valve body, so the overall size is reduced. In both cases, the spring used can be shared between the float and the relief valve. Since it can be done, less is needed and the whole can be made simple.

[0028] Furthermore, a protrusion is provided in the center of the float to ensure stability even when the float rotates. In addition, the well-balanced float ensures a stable system at all times. This has the effect of ensuring safety.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing a fuel cut-off valve according to the invention.

FIG. 2 is a view of the concave portion of the fuel cut-off valve according to the invention, viewed in the direction of A-A in FIG. 1;

FIG. 3 is a schematic cross-sectional view showing a conventional fuel cutoff valve.

[Explanation of symbols]

1, 31...Fuel cut-off valve 2, 32...flange part 3...Lower body 4, 34...Communication path 5... Upper body 6, 36...Valve body 7, 37... protrusion 8, 38...Float 9...Concavity 10...First hole 11, 41...Escape route 12, 42... Relief valve 13, 14...pin 15, 33, 40... spring 16...Second through hole 17...Third hole 18, 39, 44...lid member 19, 45... hole 20, 47...Packing 21, 48...Cover plate 35, 43...through hole 46...Gasoline tank wall

Claims (1)

[Scope of utility model registration request] 1. A valve body (6) which is provided with a communication passage (4) that opens to the outside, a relief passage (11) that communicates with the communication passage (4), and has a flange (2) on its peripheral edge. , a first through hole (10) that communicates the escape passage (11) with the inside of the valve body (6);
a relief valve (12) located in the valve body (6) and capable of opening and closing the first through hole (10); 10) A float (8) having a protrusion (7) that can be opened and closed; and a spring (15) connecting between the relief valve (12) and the float (8); A second through hole (16) that is opened and closed by the protrusion (7) of (8) and communicates the inside of the valve body (6) and the communication passage (4) when opened, and the first through hole (10) and the valve. A third through hole (17) communicating with the inside of the main body (6) is provided, and the protrusion (7) of the float (8) closes the first and second through holes (10) and (16). When the internal pressure of the valve body (6) increases during the operation, this pressure opens the relief valve (12) and escapes through the third through hole (17). Fuel cutoff valve.