JP2010229899A - Fuel shut-off valve and filter device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel shut-off valve capable of preventing the breakage of a valve element and a valve seat, and reducing the cost of members. <P>SOLUTION: The fuel shut-off valve includes: the valve seat 9 installed inside a filter inflow pipe 8 formed in a filter body 2; the valve element 13 screwed with a female screw 12 formed on the filter inflow pipe 8 and disposed so as to freely abut on and separate from the valve seat 9 by the turning operation; an operation screw 20 screwed with a reverse female screw 17 formed on the valve element 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel cutoff valve and a filter device using the same, and more particularly to a fuel cutoff valve for filtering fuel supplied to a fuel supply device and a filter device using the same.

  Conventionally, many fuel supply devices for supplying fuel to an internal combustion engine have been used, and a filter device for filtering the fuel sent to the fuel supply device is attached to the fuel supply device. ing.

  Such a conventional filter device includes, for example, a filter body and a filter cover that is attached to one surface side of the filter body and accommodates the filter therein. The filter body is provided with a filter inflow pipe through which fuel from a fuel tank that stores fuel is sent, and a valve seat is formed in the center portion of the inside of the filter inflow pipe. The valve body is accommodated in the internal valve chamber of the filter inflow pipe so as to be in contact with and separated from the valve seat by a rotation operation, and the valve body is opened and closed by rotating the valve body. Have been disclosed (for example, see Patent Document 1).

JP 2007-138830 A

  However, in the invention described in Patent Document 1, when the internal combustion engine is driven, the valve body is held in an open state separated from the valve seat. When the internal combustion engine is stopped, maintenance is performed, etc. By rotating the body, the valve body is brought into contact with the valve seat to close the valve. At this time, conventionally, there is no restriction on the operation of rotating the valve body. Therefore, when the valve body is rotated more than necessary, the tip of the valve body exerts a large force on the valve seat. The tip of the valve body or the valve seat portion is damaged. If the valve body and the valve seat are damaged in this way, the filter device and the valve body cannot be used repeatedly, and there is a problem that the member cost increases.

  The present invention has been made in view of the above points, and provides a fuel cutoff valve capable of preventing damage to a valve body and a valve seat and reducing member cost, and a filter device using the same. It is for the purpose.

In order to achieve the above object, a fuel cutoff valve according to the first aspect of the present invention includes a valve seat installed in a fuel flow path,
A valve body screwed into a female screw formed in the flow path and disposed so as to be in contact with and separated from the valve seat by a rotation operation;
An operation screw that is screwed into a female screw of a reverse screw formed on the valve body;
It is characterized by having.

  According to a second aspect of the present invention, in the first aspect, the valve body and the operation screw are temporarily fixed via a fixing member.

  According to a third aspect of the present invention, in the first or second aspect, the fixing member is an anaerobic adhesive.

According to a fourth aspect of the present invention, there is provided a filter device using the fuel cutoff valve according to the present invention. The other end is installed in a filter inflow pipe that opens into the filter chamber in which the filter is accommodated.

  According to the first aspect of the present invention, an operation is provided in which the valve body is disposed so as to be in contact with and separated from the valve seat by a turning operation and is screwed into a female screw of a reverse screw formed in the valve body. Since the screw is provided, the operating screw is rotated together with the valve body, and when the valve body abuts the valve seat and a certain amount of torque is applied to the valve body, only the operating screw is By rotating and starting to loosen, only the operating screw can be screwed out from the threaded portion of the valve body, and damage to the tip of the valve body or the valve seat can be reliably prevented. As a result, the valve body and the valve seat can be used repeatedly, and the member cost can be reduced.

  According to the invention of claim 2, since the valve body and the operation screw are temporarily fixed via the fixing member, the valve body can be reliably rotated by the rotation operation of the operation screw. When the valve body is in contact with the valve seat and a certain amount of torque is applied to the valve body, the fixing member can be removed and only the operating screw can be rotated, and the valve body is in contact with the valve seat. Therefore, it is possible to reliably prevent the valve body from proceeding further in the direction of the valve seat.

  According to the invention which concerns on Claim 3, since the adhering member is made into the anaerobic adhesive agent, an operation screw and a valve body can be temporarily hold | maintained reliably.

  According to the fourth aspect of the present invention, the filter device is provided with the valve body disposed so as to be in contact with and separated from the valve seat by the turning operation, and is screwed into the female screw of the reverse screw formed on the valve body. Since the operation screw to be combined is provided, when the operation screw rotates together with the valve body, the valve body comes into contact with the valve seat, and a certain amount of torque is applied to the valve body. Only the operating screw rotates and starts to loosen, and only the operating screw can be screwed out from the threaded portion of the valve body, and damage to the tip of the valve body or the valve seat can be reliably prevented. As a result, the valve body and the valve seat can be used repeatedly, the member cost can be reduced, and the filter device can be used over a long period of time.

It is a top view which shows embodiment of the filter apparatus using the fuel cutoff valve which concerns on this invention. It is sectional drawing in the AA of the filter apparatus shown in FIG. It is a disassembled perspective view which shows the valve body part of the filter apparatus in this embodiment. It is sectional drawing in the BB line of the filter apparatus shown in FIG. It is sectional drawing in the CC line of the filter apparatus shown in FIG. It is a block diagram which shows the state which connected the filter apparatus in this embodiment to the fuel supply apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a filter device using a fuel cutoff valve according to the present invention. As shown in FIGS. 1 and 2, the filter device 1 includes a filter body 2 and one surface of the filter body 2. It is comprised from the filter cover 3 attached to the side. A mounting flange 4 is formed on the outer peripheral edge of the filter cover 3, and the mounting flange 4 of the filter cover 3 is brought into contact with the one surface side of the filter body 2 through a seal ring 5 with screws 6. The filter cover 3 is fixed to the filter body 2 by tightening. In this state, the filter chamber 7 is formed inside the filter cover 3.

  A filter inflow pipe 8 is provided on the surface of the filter body 2 opposite to the mounting surface of the filter cover 3, and a valve seat 9 is formed at an inner central portion of the filter inflow pipe 8. The other end side of the valve seat 9 of the filter inflow pipe 8 is a valve chamber 10 having a large inner diameter. The valve chamber 10 is in communication with the interior of the filter chamber 7 in the vicinity of the valve seat 9. A filter inlet 11 is formed. An internal thread 12 is formed on the inner peripheral surface of the end portion of the valve chamber 10.

  Inside the valve chamber 10, a valve body 13 is accommodated so as to be able to advance and retract along the axial direction of the valve chamber 10, and the valve body 13 closes the valve by abutting the tip portion against the valve seat 9. The valve is released by being separated from the valve seat 9. At the base end portion of the valve body 13, a male thread 14 is formed on the outer peripheral surface to be screwed into the female thread 12 of the valve chamber 10, and a screw portion 15 having a larger diameter than the valve body 13 is provided. An urging spring 16 that urges the valve body 13 in a direction away from the valve seat 9 is disposed on the outer periphery on the tip side of the screw portion 15. The valve body 13 is housed in the valve chamber 10 while being screwed into the female screw 12 of the valve chamber 10 of the filter inflow pipe 8. By rotating the valve body 13, the inside of the valve chamber 10 is accommodated. The valve body 13 can be moved forward and backward.

  Further, in the present embodiment, as shown in FIG. 3, a screw hole 18 in which a female screw 17 cut into a reverse thread is formed on the inner peripheral surface is formed coaxially at the proximal end portion of the screw portion 15. An operation screw 20 having a male screw 19 formed by a reverse screw so as to be screwed into the screw hole 18 of the screw portion 15 is screwed into the screw hole 18. A fixing member 21 is provided between the screw portion 15 of the valve body 13 and the operation screw 20, and the fixing member 21 temporarily connects the screw portion 15 of the valve body 13 and the operation screw 20. It is comprised so that it may adhere. As the fixing member 21, for example, an anaerobic adhesive such as a screw locking agent, a thread sealant, a flange sealant, or a braze is suitable. By providing the fixing member 21 in this way, when the operation screw 20 is rotated, the operation screw 20 can be rotated together with the valve body 13, and a certain level of torque is applied to the valve body 13. In this case, the fixing member 21 is detached and only the operation screw 20 can be rotated. The fixing member may be provided between the end face of the threaded portion 15 of the valve body 13 and the periphery of the head of the operating screw 20, or between the female screw 17 of the valve body 13 and the male screw 19 of the operating screw 20. You may make it provide in between.

  As shown in FIG. 4, an air vent pipe 22 is provided in the filter body 2, and an air opening 23 communicating with the inside of the filter chamber 7 is formed in the air vent pipe 22. As shown in FIG. 5, the filter body 2 is provided with a filter outflow pipe 24, and a filter outlet 25 that communicates with the inside of the filter chamber 7 is formed at the base end of the filter outflow pipe 24. Yes.

  A fuel filter 26 is accommodated inside the filter chamber 7, and this fuel filter 26 communicates with the bag-shaped filtration part 27 and the inside of the filtration part 27 and is connected to the filter outlet 25. It is comprised from the cylinder part 28. FIG. A flange portion 29 is formed at the distal end portion of the cylindrical portion 28, and the fuel filter 26 is attached by fixing the flange portion 29 to the filter body 2 by means such as screws.

  And the filter apparatus 1 is pipe-connected as shown in FIG. 6, and is integrated in a fuel-injection apparatus. That is, a fuel outflow pipe 32 connected to the bottom of the fuel tank 31 via the first fuel pipe 30 is connected to the filter inflow pipe 8 of the filter device 1, and the filter outflow pipe 24 of the filter device 1 is connected to the filter outflow pipe 24. The pump inflow pipe 35 of the fuel pump 34 is connected via the second fuel pipe 33. An inflow pipe 39 of a fuel distribution pipe 38 is connected to the pump outflow pipe 36 of the fuel pump 34 via a third fuel pipe 37, and the fuel distribution pipe 38 is illustrated via a fuel injection valve 40. An intake pipe 41 of an internal combustion engine that is not connected is connected. The air vent pipe 22 is connected to a tank side air vent pipe 43 that opens to the upper part of the fuel tank 31 through an air pipe 42.

  Next, the operation of this embodiment will be described.

  First, during operation of the internal combustion engine, the valve body 13 is held away from the valve seat 9 and the valve is released. In this state, the fuel stored in the fuel tank 31 is the first fuel. It is supplied into the filter chamber 7 through the pipe 30 and the filter inflow pipe 8. The fuel sent to the filter chamber 7 is filtered by the fuel filter 26, converted into clean fuel, and supplied to the fuel pump 34 via the second fuel pipe 33. Thereafter, the fuel boosted by the fuel pump 34 is supplied into the fuel distribution pipe 38 via the third fuel pipe 37, and the fuel injection valve 40 is operated in accordance with an output signal from an electric control unit (not shown). Thus, desired fuel is injected and supplied into the intake pipe 41.

  At this time, the vapor that flows into the filter chamber 7 together with the fuel from the fuel tank 31 is well separated from the fuel by the fuel filter 26 in the filter chamber 7, and the air vent pipe 22, the air pipe 42, and the tank side air vent. It is discharged to the upper inside of the fuel tank 31 through the pipe 43.

  In order to prevent the fuel from the fuel tank 31 from flowing into the filter device 1 such as when the internal combustion engine is stopped, the operating screw 20 of the valve body 13 is rotated to connect the valve body 13 to the valve chamber of the filter inflow pipe 8. 10 to be screwed. At this time, in the present embodiment, since the screw portion 15 of the valve body 13 and the operation screw 20 are temporarily fixed by the fixing member 21, the operation screw 20 is rotated to operate the operation screw. The valve body 13 can be rotated together with the valve body 20 to be screwed.

  Then, when the valve body 13 is screwed and the tip of the valve body 13 comes into contact with the valve seat 9, the valve body 13 cannot move any further. A torque greater than the force held by the fixing member 21 is applied to the screw 20, and the valve body 13 and the operation screw 20 are temporarily fixed by the fixing member 21. As a result, if the rotation operation of the operation screw 20 is continued as it is, the operation screw 20 is formed with the male screw 19 of the reverse screw, so that the operation screw 20 starts to loosen, and only the operation screw 20 is the screw of the valve body 13. Screwed out from the part 15.

  As described above, in the present embodiment, the valve body 13 and the operation screw 20 are temporarily fixed by the fixing member 21, and the operation screw 20 is rotated by the fixing member 21. 20 can be rotated together with the valve body 13, and when a certain torque or more is applied to the valve body 13, the fixing member 21 is detached so that only the operation screw 20 can be rotated. Can be reliably prevented from moving further in the direction of the valve seat 9 from being in contact with the valve seat 9, and the tip of the valve body 13 or the valve seat 9 can be reliably damaged. Can be prevented. As a result, the valve body 13 and the valve seat 9 can be used repeatedly, and the member cost can be reduced.

  In the above embodiment, the case where the fuel cutoff valve is applied to the filter device has been described. However, the fuel cutoff valve may be installed at any location as long as it is a fuel flow path.

  The present invention is not limited to the above-described embodiment, and various modifications can be made based on the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Filter apparatus 2 Filter body 3 Filter cover 7 Filter chamber 8 Filter inflow pipe 9 Valve seat 10 Valve chamber 12 Female screw 13 Valve body 14 Male screw 15 Screw part 17 Female screw 18 Screw hole 19 Male screw 20 Operation screw 21 Fixing member 22 Air vent pipe 24 Filter Outflow pipe 26 Fuel filter 31 Fuel tank 34 Fuel pump 38 Fuel distribution pipe

Claims (4)

A valve seat installed in the fuel flow path;
A valve body screwed into a female screw formed in the flow path and disposed so as to be in contact with and separated from the valve seat by a rotation operation;
An operation screw that is screwed into a female screw of a reverse screw formed on the valve body;
A fuel cutoff valve characterized by comprising:   2. The fuel cutoff valve according to claim 1, wherein the valve body and the operation screw are temporarily fixed via a fixing member.   The fuel cutoff valve according to claim 1, wherein the fixing member is an anaerobic adhesive. The fuel cutoff valve according to any one of claims 1 to 3, wherein the filter cutoff pipe is formed in the filter body and has one end connected to the fuel tank and the other end opened into a filter chamber in which the filter is accommodated. A filter device characterized by being installed in

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