JPH0986598A - Oil supplying nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately perform stopping of oil supply by means of an automatic valve closing mechanism by preventing air from being mixed in an oil liq. and suppressing thereby generation of bubbles when an oil is supplied. SOLUTION: A negative pressure generating rotor 39 is provided in a rotor room 33A separated from a fuel flow path 2 and the negative pressure generating rotor 39 is rotated by linking with a fluid actuating rotor 37 rotated by a fuel flowing in the fuel flow path 2. It is thereby constituted in such a way that under a condition where an open air introducing pipe 31 is not closed, air sucked from the apex side of the open air introducing pipe 31 is exhausted into the atmosphere to keep the inside of a negative pressure room 25 under an atmospheric pressure and under a condition where the open air introducing pipe 31 is closed, by sucking the air in the negative pressure room 25 from an air path 32, the inside of the negative pressure room 25 is made to be a negative pressure condition to stop supplying of oil. It is possible thereby to prevent air from being mixed in the fuel and to suppress generation of bubbles and to prevent an automatic valve closing mechanism from working based on false detection of the liq. level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refueling nozzle for refueling a fuel tank of an automobile, etc.
The present invention relates to a refueling nozzle equipped with an automatic valve closing mechanism that automatically stops refueling when a liquid level of oil liquid is detected.

[0002]

2. Description of the Related Art Conventionally, as a refueling nozzle for refueling a fuel tank or the like of a vehicle at a fueling station, a nozzle body having a fuel flow passage therein, and a discharge for discharging fuel to a fuel tank provided in the nozzle body A pipe, a valve body provided in the nozzle body to open and close the flow path, an operating lever that is manually operated to open and close the valve body, and a negative pressure chamber in a state where the valve body is open. An automatic valve closing mechanism that automatically closes the valve body when a negative pressure state is reached, and a negative pressure generating mechanism that brings the negative pressure chamber of the automatic valve closing mechanism into a negative pressure state by the liquid level rise during refueling. The one consisting of is widely known.

Here, the above-mentioned automatic valve closing mechanism is provided with a valve body engagement / disengagement mechanism for disengageably engaging the valve body and the operating lever in the negative pressure chamber, and the negative pressure chamber is in a negative pressure state. As a result, the valve body engagement / disengagement mechanism is operated to release the engagement state between the valve body and the operation lever, and the valve body is automatically closed. Further, the negative pressure generating mechanism for bringing the negative pressure chamber of the automatic valve closing mechanism into a negative pressure state has an air suction passage whose one end side is opened to the tip side of the discharge pipe and the other end side is opened to the negative pressure chamber, and one end side is The air suction passage is opened, and the other end side is composed of a negative pressure passage opened in a throttle passage in the nozzle body (in the vicinity of the valve seat where the valve element is separated and seated).

A fueling nozzle provided with such an automatic valve closing mechanism is operated by operating the operating lever with the tip end of the discharge pipe inserted into the fuel tank to open the valve body. The fuel flowing in the passage is discharged from the discharge pipe into the fuel tank. At this time, although negative pressure is generated in the negative pressure passage of the negative pressure generating mechanism due to the flow of fuel (venturi action), the air in the fuel tank is sucked from the air suction passage to replenish the air automatically. The negative pressure chamber of the valve closing mechanism is kept at atmospheric pressure. Therefore, the valve body engagement / disengagement mechanism is maintained in a state in which the valve body and the operating lever are engaged (valve open state), and oil is continuously supplied.

Next, when fuel is supplied to the fuel tank and the liquid level of the fuel rises to the tip of the discharge pipe, one end side of the air suction passage opened to the tip side of the discharge pipe is blocked by the fuel. Therefore, the negative pressure generated in the negative pressure passage sucks the air in the negative pressure chamber to bring the negative pressure chamber into a negative pressure state, and the valve body engagement / disengagement mechanism releases the engagement state between the valve body and the operation lever. Then, the valve body is closed. As a result, the flow path is closed and the refueling is automatically stopped.

[0006]

By the way, in the fueling nozzle according to the above-mentioned prior art, at the time of refueling, the fuel is constantly circulated in the negative pressure passage by using the venturi action when the fuel flows through the throttle passage provided in the nozzle body. Negative pressure is generated. The refueling nozzle keeps the negative pressure chamber of the automatic valve closing mechanism at the atmospheric pressure state until the one end side of the air suction passage opened to the tip side of the discharge pipe is closed by the fuel. Since the air inside is sucked from the air suction passage to the negative pressure passage, the air is mixed into the fuel to be supplied through the negative pressure passage. As a result, there is a problem that the amount of bubbles generated during refueling increases due to the air mixed in the fuel.

Since the bubbles generated in the fuel tank form a layer above the actual liquid surface, the air suction passage may be blocked even during refueling. Therefore, there is a problem that the automatic valve closing mechanism operates to stop the refueling even when the fuel tank is not refueled sufficiently, and the reliability of the refueling nozzle and the workability during refueling work are deteriorated. .

The present invention has been made in view of the above-mentioned problems of the prior art, and stops the refueling by the automatic valve closing mechanism by preventing air from being mixed into the fuel at the time of refueling and suppressing the generation of bubbles. It is an object of the present invention to provide an oil supply nozzle capable of properly performing the above.

[0009]

In order to solve the above-mentioned problems, the invention of claim 1 provides a nozzle main body having an oil liquid flow passage therein, and an oil liquid which is provided in the nozzle main body and which is to be supplied with liquid. A discharge pipe for discharging a liquid, a valve body provided in the nozzle body to open and close the flow path, an operation lever for opening and closing the valve body, and a liquid level rise of the liquid supply target. A negative pressure generating mechanism for bringing a negative pressure chamber provided in the nozzle body into a negative pressure state, and the negative pressure chamber being in a negative pressure state when the valve body is opened by the operation lever It is applied to a fueling nozzle consisting of an automatic valve closing mechanism for closing the valve.

The negative pressure generating mechanism according to claim 1 is
An air passage whose one end side is opened to the tip end side of the discharge pipe and the other end side is opened to the outside of the nozzle body, and operates in accordance with the flow of the oil liquid in the flow passage, and from one end side of the air passage to the other end. And a ventilation passage having one end connected between the circulation means and one end of the air passage and the other end connected to the negative pressure chamber. Is characterized by.

According to the above construction, when the valve body is opened by the operation lever, the circulation means is operated by the oil liquid flowing through the flow path of the nozzle body. At this time, until the one end side of the air passage is closed by the oil liquid supplied to the liquid supply target, the air inside the air passage flows from one end side of the air passage to the other end side and is discharged to the outside of the nozzle body. By maintaining the atmospheric pressure inside the negative pressure chamber, the valve body maintains the open state. Then, when one end side of the air passage is closed by the oil liquid,
Only the air in the negative pressure chamber flows from the other end side of the air passage to the outside of the nozzle body by the circulation means, and the negative pressure chamber is brought into a negative pressure state, so that the automatic valve closing mechanism operates and the valve is closed. The body closes.

Further, in the negative pressure generating mechanism according to a second aspect, an air suction passage having one end side opening to the tip end side of the discharge pipe and the other end side opening to the negative pressure chamber, and the air suction passage located in the middle of the flow passage. Provided in the nozzle main body in a state of being isolated from the flow passage, and communicating with the air suction passage and open to the atmosphere, and provided in the nozzle main body located in the middle of the flow passage. Is provided in the rotor chamber so as to be interlocked with the fluid operated rotor and the fluid operated rotor that is rotated by the oil liquid flowing in the flow passage, and when one end side of the air suction passage is closed, A negative pressure generating rotor for sucking air to bring the negative pressure chamber into a negative pressure state.

According to the above construction, when the valve body is opened by the operation lever, the fluid working rotor is rotated by the oil liquid flowing through the flow path of the nozzle body, and the negative pressure is generated in the rotor chamber in conjunction with the fluid working rotor. Rotor rotates. At this time,
Until the one end side of the air suction passage is closed by the oil liquid supplied to the liquid supply target, the air sucked from the air suction passage is discharged into the atmosphere via the rotor chamber, so that the negative pressure is reduced. The interior of the chamber is kept at atmospheric pressure and the valve body is kept open. Then, when one end side of the air suction passage is closed by the oil liquid, only the air in the negative pressure chamber of the automatic valve closing mechanism is sucked by the negative pressure generating rotor rotating in the rotor chamber, so that the negative pressure chamber is brought into a negative pressure state. As a result, the automatic valve closing mechanism operates and the valve body closes. In this case, since the rotor chamber in which the negative pressure generating rotor is provided is isolated from the flow passage, the air flowing through the air suction passage is prevented from being mixed with the oil liquid flowing through the flow passage to generate bubbles. it can.

Further, according to the invention of claim 3, a nozzle main body having an oil liquid flow passage therein and a valve seat being provided in the middle of the flow passage, and a nozzle main body provided in the nozzle main body, A discharge pipe for discharging oil liquid, a valve body provided in the nozzle body so as to separate from and seat on the valve seat, an operation lever for opening and closing the valve body, and a liquid level of the liquid supply target. By a negative pressure generating mechanism that raises a negative pressure chamber provided in the nozzle body to a negative pressure state by ascending, and the negative pressure chamber becomes a negative pressure state when the valve body is opened by the operation lever, The present invention is applied to a fueling nozzle including an automatic valve closing mechanism that closes a valve body.

The negative pressure generating mechanism according to a third aspect of the present invention includes a rotor chamber located downstream of the valve seat and isolated from the flow passage in the nozzle body, and one end of the rotor chamber. An atmosphere introduction passage provided in the discharge pipe so that a side is opened to the tip end side of the discharge pipe and the other end side is opened to the rotor chamber, and one end side is opened to the rotor chamber,
An air passage provided in the nozzle body so that the other end side opens into the negative pressure chamber, an atmosphere opening passage for opening the rotor chamber to the atmosphere, and an inside of the nozzle body located in the middle of the passage. And a fluid-operated rotor that is rotated by the oil liquid flowing through the flow path, and that is provided in the rotor chamber,
When the atmosphere introduction passage is closed in a state of being rotated in conjunction with the fluid operated rotor, the air in the negative pressure chamber is sucked from the ventilation passage and discharged to the atmosphere opening passage, thereby the negative pressure chamber. It is characterized in that it is constituted by a negative pressure generating rotor for making the negative pressure state.

According to the above construction, the negative pressure that rotates in the rotor chamber until the one end of the atmosphere introducing passage is closed by the oil liquid after the valve body is opened by separating from the valve seat. The air sucked from the atmosphere introduction passage by the generation rotor is discharged into the atmosphere through the atmosphere opening passage,
By maintaining the atmospheric pressure inside the negative pressure chamber, the valve body maintains the open state. Then, when one end of the atmosphere introduction passage is blocked by the oil liquid, only the air in the negative pressure chamber is sucked by the negative pressure generating rotor and discharged into the atmosphere through the atmosphere opening passage, so that the negative pressure chamber is negatively pressured. In this state, the automatic valve closing mechanism operates and the valve body sits on the valve seat to close the valve. In this case, since the rotor chamber in which the negative pressure generating rotor is provided is isolated from the flow passage, the air flowing through the air suction passage is prevented from being mixed with the oil liquid flowing through the flow passage to generate bubbles. it can.

Further, in the invention of claim 4, the fluid operated rotor and the negative pressure generating rotor are connected by a connecting shaft, and the blades planted on the outer periphery of the fluid operated rotor and the outer periphery of the negative pressure generating rotor are planted. This is because the blades provided are opposite to each other.

According to the above construction, when the fluid-operated rotor is rotated by the oil liquid flowing through the flow passage, the negative pressure generating rotor, which rotates in conjunction with the fluid-operated rotor, rotates the air in the direction opposite to the flow of the oil liquid. Is generated in the rotor chamber,
Air in the negative pressure chamber can be reliably sucked from the air suction passage (ventilation passage) in a state where one end side of the air suction passage (atmosphere introduction passage) is closed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
It will be described in detail with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a nozzle body which forms an outer shell of a fueling nozzle according to this embodiment, and a discharge pipe 5 described later is attached to one end side (left side in the figure) of the nozzle body 1. . In addition, the fuel passage 2 is provided in the nozzle body 1.
3, the inflow port 3 of the fuel flow path 2 is open on one side surface of the nozzle body 1, and the outflow port 4 is open on one end side of the nozzle body 1. A fuel supply hose (not shown) is connected to the fuel flow path 2 via an inflow port 3.

Reference numeral 5 denotes a discharge pipe attached to one end side of the nozzle body 1, the base end side of the discharge pipe 5 is connected to the outflow port 4 of the fuel flow path 2, and the tip end side thereof draws a downward curved line. The fuel that extends and flows through the fuel flow path 2 is discharged to a fueling target such as a fuel tank (not shown).

No. 6 is located in the fuel passage 2 and is located in the nozzle body 1
An annular valve seat provided on the valve seat 6 with a fuel passage 2
The valve element 8 described later is separated and seated to open and close the valve. Reference numeral 7 denotes a valve shaft sliding hole formed on the other end side of the nozzle body 1 so as to face the valve seat 6, and the valve shaft sliding hole 7 has a valve shaft 9 to be described later as indicated by an arrow in FIG. It is slidably inserted in the AA 'direction.

Reference numeral 8 denotes a valve body which is separated from and seated on the valve seat 6 to open and close the fuel flow passage 2. The valve body 8 is arranged in the nozzle body 1 while being fixed to the tip end side of the valve shaft 9. The base end side of the valve shaft 9 is slidably arranged in the valve shaft sliding hole 7. Here, the valve shaft 9 is composed of two members, a valve body side shaft 10 and a lever side shaft 11, which will be described later.

Reference numeral 10 denotes the valve shaft 9 together with the lever side shaft 11.
Of the valve body side shaft, one end side of the valve body side shaft 10 is fixed to the valve body 8 and the other end side is slidably fitted in the valve shaft sliding hole 7. Also, the valve body side shaft 1
An insertion hole 10A into which the small diameter portion 11A of the lever shaft 11 is inserted is formed at 0, and a notch portion that extends in the radial direction so as to open in the middle of the insertion hole 10A is formed on the outer peripheral side as shown in FIG. 10B is formed.

Reference numeral 11 denotes a lever side shaft located at the other end side of the valve body side shaft 10 and slidably fitted in the valve shaft sliding hole 7. One end side of the lever side shaft 11 is a valve. The small-diameter portion 11A is slidably inserted into the insertion hole 10A of the body-side shaft 10, and the engagement groove 11 corresponding to the cutout portion 10B of the valve-body-side shaft 10 is provided in the middle of the small-diameter portion 11A.
B (see FIG. 3) is formed. Further, a lever engaging hole 11C with which an engaging end portion 14A of a communication lever 14 described later engages is formed in the other end side of the lever side shaft 11.

Reference numeral 12 is a valve spring located on the outer peripheral side of the valve body side shaft 10 and disposed between the valve body 8 and the nozzle body 1. The valve spring 12 seats the valve body 8 on the valve seat 6. It always urges in the direction of the arrow, that is, in the direction of arrow A ', and is constituted by a coil spring.

Reference numeral 13 is a lever guard provided on the lower side of the nozzle body 1 and having an operation hole 13A for operating an operation lever 17 described later. Reference numeral 14 is rotatable on the lever guard 13 via a shaft 15. Each of the connecting levers 14 has a substantially L-shaped connecting lever supported by the engaging lever 14A. The connecting end 14A of the connecting lever 14 extends upward and engages with the lever engaging hole 11C of the lever-side shaft 11, The tip end side of the No. 1 extending toward one end side is in contact with the operation lever 17. Reference numeral 16 denotes a rattling prevention coil spring disposed between the lever side shaft 11 and the valve shaft sliding hole 7, and the coil spring 16 is provided in the lever engagement hole 11 of the lever side shaft 11.
By always contacting C with the engaging end portion 14A of the connecting lever 14, rattling of the connecting lever 14 is prevented.

Reference numeral 17 denotes an operation lever rotatably attached to the lever guard 13 via a shaft 18, and the operation lever 1
The tip side of 7 becomes a free end and extends to the operation hole 13A. Then, as shown in FIG. 2, the operation lever 17 has its tip end side pivoted in the direction of arrow BB ', whereby the engaging end portion 14A of the connecting lever 14 is indicated by arrow CC'.
The lever side shaft 11 is moved in the arrow A direction against the coil spring 16. Also,
The operation lever 17 can be held in a rotating state by locking the tip end side of the operating lever 17 to the hook portion 19 in the state of being rotated in the direction of the arrow B.

Reference numeral 20 denotes an automatic valve closing mechanism for automatically closing the valve body 8 when the fuel supplied to the fuel tank (not shown) reaches a predetermined liquid level.
Is disposed in an opening 21 formed on the side surface of the nozzle body 1 on the side opposite to the inflow port 3, and includes a diaphragm 23, a receiving plate 26, an engaging roller 27, a coil spring 28 and the like, which will be described later. It has a valve body engagement / disengagement mechanism 22.

Reference numeral 23 is a diaphragm, and 24 is a cap that fixes the peripheral edge of the diaphragm 23 and closes the opening 21. As shown in FIG. 4, the diaphragm 23 defines a negative pressure chamber 25 in the opening 21. Is made. A receiving plate 26 is fixed to the central portion of the diaphragm 23.

Here, as shown in FIG. 5, the receiving plate 26 is formed in a U-shape that opens toward the valve shaft 9 side, and its opposing wall 2
6A and 26A have elongated holes 26 extending in the axial direction of the valve shaft 9.
B and 26B are formed. In addition, the receiving plate 26,
Two engaging rollers 27, 27 are slidably fitted over the elongated holes 26B, and the engaging rollers 27 are notched in the notch portion 1 of the valve body side shaft 10 in accordance with the movement of the diaphragm 23.
0B and the engaging groove 11B of the lever side shaft 11 are engaged and disengaged.

28 is located in the negative pressure chamber 25 and is located in the cap 2
4 is a coil spring provided between the diaphragm 23 and the diaphragm 23.
The engaging rollers 27 are urged to be fitted into the engaging grooves 11B of the lever-side shaft 11 via.

Reference numeral 29 denotes a negative pressure generating mechanism for bringing the negative pressure chamber 25 of the automatic valve closing mechanism 20 into a negative pressure state by the liquid level rise in the fuel tank at the time of refueling. The negative pressure generating mechanism 29 will be described later. The air suction passage 30, a rotor chamber 33A formed in the rotor housing 33, a fluid-operated rotor 37, and a negative pressure generating rotor 39 are roughly configured.

Reference numeral 30 denotes an air suction passage whose one end side is opened to the tip end side of the discharge pipe 5 and the other end side is opened to the negative pressure chamber 25. The air suction passage 30 is connected to the atmosphere introduction pipe 31 as described later. The air passage 32 and the intake communication passage 34 formed in the rotor housing 33 are provided.

Reference numeral 31 denotes an atmosphere introducing pipe serving as an atmosphere introducing passage arranged in the discharge pipe 5. One end side of the atmosphere introducing pipe 31 is an intake air opening to the tip side of the discharge pipe 5 as shown in FIG. The opening 31 </ b> A is formed, and the other end of the opening 31 </ b> A is fitted into a mounting opening 33 </ b> C of the rotor housing 33, which will be described later, and opens into a rotor chamber 33 </ b> A formed inside the rotor housing 33.

Reference numeral 32 denotes a ventilation passage formed on the side surface of the nozzle body 1. One end side of the ventilation passage 32 has an intake communication passage 34.
To the rotor chamber 33A through the negative pressure chamber 25 on the other end side.
It is open to.

Reference numeral 33 denotes a rotor housing body located in the middle of the fuel flow path 2 and disposed in the nozzle body 1. The rotor housing body 33 is connected to the outlet 4 on the downstream side of the valve seat 6. It is provided in between. Here, in the rotor housing 33, as shown in FIG.
Or, as shown in FIG.
A circular rotor chamber 33A in which the negative pressure generating rotor 39 is housed
And a pair of fuel passage portions 33B and 33B that axially penetrates around the rotor chamber 33A with a fan-shaped cross section, a mounting port 33C to which the other end side of the air introduction pipe 31 is mounted, and a concentric shape with the rotor chamber 33A. A shaft insertion hole 33D through which a connecting shaft 38 described later is inserted, and a seal accommodating recess 33E concentrically connected to the shaft insertion hole 33D are formed.

Reference numeral 34 denotes an intake communication passage which is formed in the rotor housing 33 and constitutes the air suction passage 30 together with the air introduction pipe 31 and the ventilation passage 32. The intake communication passage 34 is, as shown in FIG. A pair of radial passages 34A, 34A that are bored in the radial direction of the rotor housing 33 and have one end side opening to the rotor chamber 33A, and the radial passages 34A that are formed around the entire circumference of the rotor housing 33. And an annular groove 34B which is open at the other end side of the ventilation groove 32B.
Is in communication with. Here, one end side of each radial passage 34A is opened to the upstream side of the air flow generated in the rotor chamber 33A when the negative pressure generating rotor 39 rotates in the rotor chamber 33A during refueling.

Reference numeral 35 is formed in the rotor housing 33 for discharging the air sucked from the intake port 31A of the air introduction pipe 31 and the air sucked from the negative pressure chamber 25 through the ventilation passage 32 to the outside (into the atmosphere). The atmosphere release passage 35 is a pair of radial passages 35 that are formed in the rotor housing 33 in the radial direction and have one end opening to the rotor chamber 33A.
A, 35A and an annular groove formed over the entire circumference of the outer circumference of the rotor housing 33 at a position axially separated from the annular groove 34B of the intake communication passage 34, and the other end side of each radial passage 35A is open. It consists of 35B. And the annular groove 3
5B communicates with an atmosphere opening hole 36 formed in the nozzle body 1, and the rotor chamber 33A is constantly opened to the atmosphere through the atmosphere opening passage 35 of the rotor housing 33 and the atmosphere opening hole 36 of the nozzle body 1. ing.

Reference numeral 37 denotes a fluid operated rotor which is located in the middle of the fuel flow path 2 and which is provided in the nozzle body 1 and constitutes a flow means together with a negative pressure generating rotor 39 which will be described later. , Which has a plurality of blades 37A, 37A, ... Implanted at a predetermined inclination angle with respect to the direction, and is rotatably fitted into a shaft insertion hole 33D of the rotor housing 33, the rotor housing It is fixed to a projecting end portion projecting to the outside of 33. The fluid operated rotor 37
As shown in FIG. 7, the fuel flows through the fuel flow path 2 in the direction of arrow D at the time of refueling, and rotates in the direction of arrow E, for example, along with the connecting shaft 38.

Reference numeral 39 denotes a rotor chamber 33A of the rotor housing 33.
The negative pressure generating rotor provided inside the negative pressure generating rotor 3
9 has a plurality of blades 39A, 39A, ... Implanted in the opposite direction to the respective blades 37A of the fluid-operated rotor 37, and is fixed to the protruding end portion of the connecting shaft 38 protruding into the rotor chamber 33A. There is.

The negative pressure generating rotor 39 rotates in the direction of the arrow E in the rotor chamber 33A in conjunction with the fluid actuated rotor 37. For example, in the state where the atmosphere introducing pipe 31 is not closed, the negative pressure generating rotor 39 shown in FIG. As shown by the arrow F1, the air introduction pipe 3
The air sucked from one end side of No. 1 is discharged into the atmosphere through the rotor chamber 33A, the atmosphere opening passage 35, and the atmosphere opening hole 36. Further, when the air introduction pipe 31 is closed, the air in the negative pressure chamber 25 is sucked from the air passage 32, and as shown by an arrow F2 in FIG. 6, the intake communication passage 34 and the rotor chamber 33.
The inside of the negative pressure chamber 25 is brought into a negative pressure state by discharging into the atmosphere through A, the atmosphere opening passage 35, and the atmosphere opening hole 36.

Reference numeral 40 denotes a seal member fitted in the seal accommodating recess 33E of the rotor accommodating body 33. The seal member 40 is a shaft insertion hole 33D of the rotor accommodating body 33 and the connecting shaft 3.
8 is liquid-tightly sealed, and the rotor chamber 33A is connected to the fuel passage 2
It plays a role of separating from.

The refueling nozzle according to this embodiment has the above-mentioned construction, and its operation will be described below.

First, in order to refuel the fuel tank, the worker rotates the operation lever 17 in the direction of arrow B (see FIG. 2) with the discharge pipe 5 inserted into the fuel tank refueling port to communicate with the fuel tank. The lever-side shaft 11 is moved in the arrow A direction via the lever 14. At this time, the air introduction pipe 31
31A is open to the atmosphere in the fuel tank, and the negative pressure chamber 25 communicates with the air suction passage 30 including the atmosphere introduction pipe 31, the ventilation passage 32, and the intake communication passage 34.
Since the inside is kept at atmospheric pressure, the coil spring 28
As shown in FIG. 3, the lever-side shaft 11 and the valve body-side shaft 10 engage with each other by the engagement rollers 27 biased in the engagement direction. Therefore, by rotating the operation lever 17 in the direction of arrow B, the valve-side shaft 10 moves together with the lever-side shaft 11 in the direction of arrow A, and the valve body 8 is separated from the valve seat 6 as shown in FIG. To do. As a result, the fuel pumped from the fuel pump (not shown) and introduced into the fuel flow path 2 from the inflow port 3 is discharged into the fuel tank from the discharge pipe 5 connected to the outflow port 4.

At the time of refueling, the fluid working rotor 37 rotates in the direction of arrow E by the fuel flowing through the fuel passage 2 in the direction of arrow D as shown in FIG. The pressure generating rotor 39 is arranged in the rotor chamber 33A.
Rotate in. As a result, as shown by the arrow F1 in FIG. 6, the air in the fuel tank is fed to the intake port 3 of the atmosphere introduction pipe 31.
The air is sucked from 1A and discharged into the atmosphere through the rotor chamber 33A, the atmosphere opening passage 35, and the atmosphere opening hole 36. In this case, since the atmosphere introduction pipe 31, the rotor chamber 33A, the atmosphere opening passage 35, and the atmosphere opening hole 36 are isolated from the fuel flow passage 2, the air in the fuel tank sucked in becomes the fuel flowing through the fuel flow passage 2. It can be surely prevented from being mixed. As a result, generation of bubbles during refueling can be suppressed, and undesired refueling stop due to operation of the automatic valve closing mechanism 20 in a state where sufficient refueling is not performed, or vaporization in the fuel tank. Occurrence can be prevented.

When refueling of the fuel tank progresses and the liquid level rises to the tip of the discharge pipe 5 (so-called full tank state), the intake port 31A of the atmosphere introducing pipe 31 is blocked by the fuel. At this time, due to the rotation of the negative pressure generating rotor 39 in the rotor chamber 33A, the air in the negative pressure chamber 25 is moved to the ventilation passage 3
2 is sucked into the air through the intake communication passage 34, the rotor chamber 33A, the atmosphere opening passage 35, and the atmosphere opening hole 36, as shown by an arrow F2 in FIG.
The inside of the negative pressure chamber 25 shifts to a negative pressure state. As a result, the diaphragm 23 is displaced upward against the coil spring 28,
As shown in FIG. 12, each engaging roller 27 together with the receiving plate 26 fixed to the diaphragm 23 is provided on the lever side shaft 11
The valve body 8 attached to the valve body side shaft 10 moves in the arrow A'direction by the valve spring 12 and is seated on the valve seat 6. As a result, the fuel flow path 2 is closed by the valve body 8 and the refueling is automatically stopped in the full tank state.

When the fuel tank is full as described above, the operator rotates the operating lever 17 in the direction of arrow B'to move the lever side shaft 11 in the direction of arrow A ', and discharges the fuel. Pull out the pipe 5 from the fuel filler port of the fuel tank. As a result, the intake port 31A of the atmosphere introducing pipe 31 is opened to the atmosphere, and the atmosphere introducing pipe 31 and the intake communication passage 3
4. Since the atmosphere is introduced into the negative pressure chamber 25 through the ventilation passage 32, the negative pressure chamber 25 shifts to the atmospheric pressure state and the diaphragm 23 is displaced downward by the urging force of the coil spring 28. The engaging rollers 27 engage with the engaging grooves 11B of the lever-side shaft 11 to return to the initial state shown in FIGS. 1 to 3, and a series of oil supply operations are completed.

As described above, according to this embodiment, the negative pressure generating rotor 3 is provided in the rotor chamber 33A isolated from the fuel passage 2.
9 is provided, and the negative pressure generating rotor 39 is rotated in conjunction with the fluid operated rotor 37 that is rotated by the fuel flowing in the fuel flow path 2, so that the atmosphere introducing pipe 31 is not blocked. The air sucked from the intake port 31A of 31 is discharged into the atmosphere through the rotor chamber 33A, the atmosphere opening passage 35, and the atmosphere opening hole 36, and the air in the negative pressure chamber 25 is ventilated when the atmosphere introducing pipe 31 is closed. Road 32
The negative pressure chamber 25 is configured to be in a negative pressure state by sucking from the air and exhausting it to the atmosphere through the intake communication passage 34, the rotor chamber 33A, the atmosphere opening passage 35, and the atmosphere opening hole 36. It is possible to reliably prevent the air from being mixed into the fuel, as compared with the configuration in which the negative pressure is generated in the negative pressure passage by the flow of the fuel at the time of refueling as in the refueling nozzle described in the related art.

As a result, the occurrence of bubbles during refueling can be suppressed, the operation of the automatic valve closing mechanism due to the erroneous detection of the liquid surface due to the bubbles can be prevented, and the reliability of the refueling nozzle can be improved.

Moreover, by reducing the amount of vapor generated in the fuel tank during refueling, it is possible to prevent the vapor from leaking out of the fuel tank, and to prevent atmospheric pollution due to vapor leakage.

In the above-mentioned embodiment, the case where the fluid operating rotor 37 and the negative pressure generating rotor 39 constitute the flow means has been described as an example, but the present invention is not limited to this, and the flow path 2 As long as it is configured to flow along with the flow of the oil liquid to flow the air from the intake port 31A of the atmosphere introduction passage 31 to the atmosphere opening passage 35, the electric motor or the ejector may be used to constitute the circulation means.

In the above-described embodiment, the case where the rotor housing 33, the fluid operated rotor 37, the negative pressure generating rotor 39 and the like are arranged on the downstream side of the valve seat 6 has been described as an example.
The present invention is not limited to this, and may be arranged, for example, in the vicinity of the inflow port 3 on the upstream side of the valve seat 6.

Furthermore, in the above-described embodiment, the fluid operated rotor 37 and the negative pressure generating rotor 39 are directly linked by the connecting shaft 38, but the present invention is not limited to this, and the fluid operated rotor 37 and The fluid operated rotor 37 and the negative pressure generation rotor 39 may be indirectly linked by interposing a power transmission means such as a gear between the negative pressure generation rotor 39 and the negative pressure generation rotor 39.

[0055]

As described above in detail, according to the invention of claim 1, one end side is open to the tip end side of the discharge pipe, and the other end side is open to the outside of the nozzle body, and the oil liquid in the flow path. A flow means that operates according to the flow and flows the air inside the air passage from one end side to the other end side of the air passage, and one end is connected between the flow means and one end side of the air passage, and the other end is By constructing the negative pressure generation mechanism from the air passage connected to the negative pressure chamber of the automatic valve closing mechanism, when refueling with one end side of the air passage not closed, suction is performed from the air passage by the operation of the circulation means. By discharging the generated air to the outside of the nozzle body, the negative pressure chamber is kept at atmospheric pressure to continue refueling, and when one end side of the air passage is blocked by the oil liquid, it is circulated through the ventilation passage by the circulation means. Nozzle sucking air only from the negative pressure chamber By discharging the body, it actuates the automatic closing mechanism negative pressure chamber as a negative pressure state, it is possible to stop the fuel supply.

Therefore, as compared with the structure such as the conventional oil supply nozzle in which the negative pressure is generated in the negative pressure passage by the flow of the oil liquid at the time of oil supply, air is surely prevented from being mixed into the oil liquid. Therefore, it is possible to suppress the occurrence of bubbles during refueling, prevent interruption of refueling due to erroneous detection of the liquid level, and improve reliability of the refueling nozzle.

Further, according to the invention of claim 2, an air suction passage having one end side opened to the tip end side of the discharge pipe and the other end side opened to the negative pressure chamber, and is isolated from the flow passage in the middle of the flow passage. State, the rotor chamber communicating with the air suction passage and open to the atmosphere, the fluid operated rotor rotated by the oil liquid flowing in the flow path, and the negative pressure rotated in the rotor chamber in conjunction with the fluid operated rotor. By constructing the negative pressure generating mechanism from the generating rotor, the air sucked from the air suction passage by the negative pressure generating rotor rotating in the rotor chamber is supplied during refueling in the state where one end side of the air suction passage is not closed. By discharging into the atmosphere through the rotor chamber,
When the negative pressure chamber is maintained at atmospheric pressure and oil is continuously supplied, and when one end of the air suction passage is blocked by the oil liquid, the negative pressure generating rotor sucks air only from the negative pressure chamber and discharges it into the atmosphere. Then, by bringing the negative pressure chamber into a negative pressure state, the automatic valve closing mechanism can be operated to stop the fuel supply.

Therefore, as compared with the structure such as the conventional oil supply nozzle in which the negative pressure is generated in the negative pressure passage by the flow of the oil liquid at the time of oil supply, air is surely prevented from being mixed into the oil liquid. Therefore, it is possible to suppress the occurrence of bubbles during refueling, prevent interruption of refueling due to erroneous detection of the liquid level, and improve reliability of the refueling nozzle.

Further, by reducing the amount of vapor generated in the refueling target during refueling, it is possible to prevent the vapor from leaking to the outside of the refueling target.

Further, according to the invention of claim 3, the air sucked from the atmosphere introducing passage by the negative pressure generating rotor is released to the atmosphere until the one end side of the atmosphere introducing passage is closed by the oil liquid during refueling. Is discharged into the atmosphere through the negative pressure chamber to continue the refueling, and when one end of the atmosphere introduction passage is blocked by the oil liquid, the negative pressure generation rotor causes the negative pressure chamber to remain in the negative pressure chamber. Only the air is sucked and discharged into the atmosphere through the atmosphere opening passage, and the negative pressure chamber becomes a negative pressure state, and the automatic valve closing mechanism operates to stop the refueling. At this time, it is possible to reliably prevent air from being mixed into the oil liquid.

For this reason, it is possible to suppress the occurrence of bubbles during refueling, prevent refueling interruption due to erroneous detection of the liquid surface, improve the reliability of the refueling nozzle, and effectively prevent vapor leakage. be able to.

Further, according to the invention of claim 4, when the fluid-operated rotor is rotated by the oil liquid flowing through the flow path, the negative pressure generating rotor which rotates in conjunction with the fluid-operated rotor is Since a flow of air in the opposite direction to the flow is generated in the rotor chamber, when one end of the air suction passage (atmosphere introduction passage) is blocked by oil liquid during refueling, the air in the negative pressure chamber is generated by the negative pressure generating rotor. It is possible to reliably suck air from the air suction passage (ventilation passage), and by closing the valve body by the automatic valve closing mechanism, it is possible to reliably stop refueling.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an oil supply nozzle according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view showing a main part in FIG.

3 is a cross-sectional view as seen from the direction of arrows III-III in FIG.

FIG. 4 is an enlarged cross-sectional view showing an enlarged valve body engagement / disengagement mechanism in FIG.

5 is an external perspective view showing the receiving plate and each engagement roller in FIG. 4 in an enlarged manner.

FIG. 6 is an enlarged vertical sectional view of an essential part showing an enlarged part of FIG. 2;

FIG. 7 is an enlarged vertical sectional view of an essential part showing an enlarged part of FIG. 3;

8 is a cross-sectional view of the rotor housing body in FIG. 6 viewed from the direction of arrows VIII-VIII.

FIG. 9 is a cross-sectional view of the rotor housing body in FIG. 6 viewed from the arrow IX-IX direction.

10 is a cross-sectional view of the rotor housing body, the negative pressure generating rotor, and the like in FIG. 6 as seen in the direction of arrow XX.

FIG. 11 is a cross-sectional view showing the oil supply nozzle in a state where the valve body is opened by the operation lever, at the same position as in FIG.

FIG. 12 is a cross-sectional view at the same position as in FIG. 3, showing the oil supply nozzle in a state where the valve body is closed by the operation of the automatic valve closing mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle main body 2 Fuel flow path 5 Discharge pipe 6 Valve seat 8 Valve body 17 Operating lever 20 Automatic valve closing mechanism 25 Negative pressure chamber 29 Negative pressure generating mechanism 30 Air suction passage 31 Air introduction pipe 32 Ventilation passage 33 Rotor housing 33A Rotor Chamber 35 Atmosphere release passage 36 Atmosphere release hole 37 Fluid operated rotor 39 Negative pressure generation rotor

Claims (4)

[Claims] 1. A nozzle main body having an oil liquid flow passage therein, a discharge pipe provided in the nozzle main body for discharging oil liquid to a liquid supply target, and an inside of the nozzle main body for opening and closing the flow passage. And a control lever that opens and closes the valve body, and a negative pressure is generated to bring the negative pressure chamber provided in the nozzle body into a negative pressure state by raising the liquid level of the liquid supply target. A negative pressure generating mechanism, comprising: a mechanism; and an automatic valve closing mechanism that closes the valve body by bringing a negative pressure chamber into a negative pressure state when the valve body is opened by the operation lever. Is an air passage whose one end side is opened to the tip end side of the discharge pipe and the other end side is opened to the outside of the nozzle main body, and operates in accordance with the flow of oil liquid in the flow passage, and from one end side of the air passage. Circulation means for flowing the air inside the air passage to the other end side, and the circulation means Fueling nozzle and the other end one end connected between the one end of the air passage and the step is constructed from a gas passage and connected to the negative pressure chamber. 2. A nozzle main body having an oil liquid flow passage therein, a discharge pipe provided in the nozzle main body for discharging the oil liquid to a liquid supply target, and an inside of the nozzle main body for opening and closing the flow passage. And a control lever that opens and closes the valve body, and a negative pressure is generated to bring the negative pressure chamber provided in the nozzle body into a negative pressure state by raising the liquid level of the liquid supply target. A negative pressure generating mechanism, comprising: a mechanism; and an automatic valve closing mechanism that closes the valve body by bringing a negative pressure chamber into a negative pressure state when the valve body is opened by the operation lever. Is an air suction passage whose one end side is open to the tip end side of the discharge pipe and the other end side is open to the negative pressure chamber, and the nozzle body which is located in the middle of the flow passage and isolated from the flow passage. It is installed inside and communicates with the air suction passage and opens to the atmosphere. Rotor chamber, a fluid-operated rotor located in the nozzle body located in the middle of the flow passage and rotated by an oil liquid flowing in the flow passage, and the rotor chamber so as to interlock with the fluid-operated rotor. And a negative pressure generating rotor for sucking air in the negative pressure chamber to bring the negative pressure chamber into a negative pressure state when one end side of the air suction passage is closed. . 3. A nozzle body having an oil liquid flow passage therein and a valve seat provided in the middle of the flow passage, and a discharge pipe provided in the nozzle main body for discharging the oil liquid to a liquid supply target. A valve body provided in the nozzle body so as to be seated on and off the valve seat, an operation lever for opening and closing the valve body, and a liquid level rise of the liquid supply target to cause the liquid body to rise in the nozzle body. A negative pressure generating mechanism that sets a negative pressure chamber to a negative pressure state, and an automatic valve closing mechanism that causes the negative pressure chamber to be in a negative pressure state when the valve body is opened by the operation lever. In a fueling nozzle including a valve closing mechanism, the negative pressure generating mechanism is located downstream of the valve seat and is provided in the nozzle body in a state of being isolated from the flow passage, and a rotor chamber. Side is open to the tip end side of the discharge pipe, and the other end side is open to the rotor chamber. An air introduction passage provided in the discharge pipe, a vent passage provided in the nozzle body so that one end side is opened to the rotor chamber and the other end side is opened to the negative pressure chamber, and the rotor chamber. An atmosphere opening passage that opens to the atmosphere, a fluid-operated rotor that is provided in the nozzle body located in the middle of the flow path and that is rotated by an oil liquid flowing through the flow path, and a fluid operation rotor that is provided in the rotor chamber. When the atmosphere introduction passage is closed while being rotated in conjunction with the operating rotor, the air in the negative pressure chamber is sucked from the ventilation passage and discharged into the atmosphere release passage to make the inside of the negative pressure chamber negative. A refueling nozzle comprising a negative pressure generating rotor which is in a pressure state. 4. The fluid operated rotor and the negative pressure generating rotor are connected by a connecting shaft, and the blades planted on the outer circumference of the fluid operated rotor and the blades planted on the outer circumference of the negative pressure generation rotor are mutually connected. The oil supply nozzle according to claim 2 or 3, wherein the oil supply nozzle is configured so as to be in the opposite direction.