JPH04311498A - Vapor recovery device for oil feeder - Google Patents

Abstract

PURPOSE:To equip an oil feeder apparatus with a vapor recovery device that recovers effectively the vapor while making a rotor installed in a casing of a vapor sucking blower rotate smoothly. CONSTITUTION:A part of fuel oil supplied from an oil feeding pump to a fuel oil tank through an oil feeding pipe line is supplied as lubricating oil to the inside of a casing 22 through a communicating hole 19 opened at its one end to the casing 22 of a fluid motor 11 by operation of a rotor 24 installed on the side of a vapor sucking blower 21, and smooth rotation of the rotor 24 is ensured therewith.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vapor recovery device used in a refueling system.

0002

2. Description of the Related Art When a highly volatile fuel such as gasoline is filled into the fuel tank of an automobile, a large amount of vapor is generated within the fuel tank. The amount of vapor generated is proportional to the temperature, and it often occurs particularly when there is a significant difference between the temperature of the gasoline being refueled and the temperature inside the fuel tank. This causes vapor to leak out from the fuel tank, which is dangerous.

[0003] As a countermeasure to this problem, US Patent No. 3,850,208
As disclosed in the specification, a casing of a fluid motor connected to a refueling pipe line and a casing of a vapor suction blower connected to a vapor recovery pipe line are formed in a refueling nozzle, respectively, and a common vane is formed in these casings. 1 with
A fluid motor is formed on the fuel supply pipe side by providing two rotors, and a vapor suction blower driven by the fluid motor is formed on the vapor recovery pipe side to collect vapor in the fuel tank. There is. In devices configured in this way, the fluid motor and vapor suction blower are installed inside the refueling nozzle, which increases the size and weight of the refueling nozzle, making it difficult to maneuver around the refueling operation, and further increasing the suction It is difficult to increase the capacity of the fuel blower, and there are problems such as insufficient vapor recovery if a large amount of vapor is generated in the fuel tank.

Furthermore, in the device disclosed in US Pat. No. 4,068, a small fluid motor is disposed in the middle of the oil supply pipe, and a large blower is disposed in the vapor recovery pipe as a vapor suction blower. The rotors of the fluid motor and the blower are connected by a common rotating shaft to increase the vapor suction capacity of the vapor suction blower. However, even with this type of device, if a larger amount of vapor is generated in the fuel tank than the preset suction capacity of the vapor suction blower, sufficient recovery cannot be performed, and even after refueling is stopped, a small amount of vapor may still be collected. However, in conventional systems, the blower also stops at the same time as refueling stops, which causes vapor to flow out from the fuel tank into the atmosphere after refueling is stopped.

[0005] As a countermeasure to this problem, the present applicant proposed a fluid motor having a rotor and a casing in the middle of the refueling pipe line from the refueling pump to the refueling nozzle, and also from the refueling nozzle to the vapor discharge end. A vapor suction blower having a rotor that is driven by increasing the rotation speed of the fluid motor by a speed-increasing gear is provided in each vapor recovery pipe leading to the vapor recovery pipe, and a one-way clutch is further provided between the rotor shaft of the suction blower and the speed-increasing gear. If more vapor flows from the fuel tank than the suction capacity of the suction blower, the vapor pressure causes the rotor shaft to rotate at a faster speed than the rotational drive of the speed increasing gear to discharge a large amount of vapor. We have proposed a vapor recovery device for a refueling system that is capable of rotating a rotor and discharging vapor even after the fuel supply to the fuel tank is stopped, by rotating a rotor using the pressure of the vapor flowing from the fuel tank.

[0006]

[Problems to be Solved by the Invention] According to the above-mentioned prior art, by interposing a one-way clutch between the rotor shaft and the speed increasing gear, if vapor is generated in excess of the suction capacity of the suction blower, Vapor can be effectively recovered even after the fuel supply is stopped. However, for this purpose, it is necessary to rotate the rotor more smoothly within the vapor suction blower using the pressure caused by the vapor from the fuel tank.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vapor recovery device for a refueling system in which a rotor provided in a casing of a vapor suction blower is rotated smoothly and vapor can be recovered more effectively. .

[0008]

[Means for Solving the Problems] A vapor recovery device in a refueling system according to the present invention that achieves the above object includes a refueling pipe line leading from a refueling pump to a refueling nozzle, a flow meter for measuring the flow rate in the refueling pipe line, A fluid motor disposed in the middle of the fuel supply pipe and including a rotor and a casing; a vapor recovery pipe extending from the fuel supply nozzle to the vapor discharge end; and a fluid motor disposed in the middle of the vapor recovery pipe and driven by the fluid motor. A vapor suction blower that includes a rotor and a casing, and a communication hole that opens at one end into the casing of a fluid motor and at the other end into a part of the casing located upstream from the rotor of the vapor suction blower. .

[0009]

[Operation] A portion of the fuel oil supplied from the fuel pump to the fuel tank via the fuel supply pipe is supplied as lubricating oil into the vapor suction blower side casing through a communication hole that opens at one end in the casing of the fluid motor. This ensures smooth rotation of the rotor, and can also be expected to have a long life.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vapor recovery device in a fuel supply system according to the present invention will be described below with reference to the drawings.

FIG. 8 is a schematic explanatory diagram of a refueling system equipped with a vapor recovery device, and reference numeral 1 in the figure is a refueling pipe line that leads fuel oil in an underground tank to a refueling nozzle 2. In the middle of this fuel supply pipe 1, there is a fuel pump 3 driven by a pump motor M to forcefully feed fuel oil in an underground tank toward a fuel supply nozzle 2, and a fluid motor 11 that drives a vapor suction blower 21, which will be described later. and a flow meter 4 for measuring the amount of oil supplied are arranged in order from the upstream side.

A fluid pulse transmitter 5 is attached to the flow meter 4, and a signal from the fluid pulse transmitter 5 is configured to be converted by a control device 6 into an oil supply amount and displayed on a display 7. On the other hand, reference numeral 9 in the figure is a vapor recovery pipe, one end of which is connected to a vapor collector 9a provided at the tip of the cylinder of the fuel supply nozzle 2, and the vapor in the fuel tank (not shown) is removed from the vapor recovery pipe 9. The vapor suction blower 21 installed in the vapor suction blower 21 sucks the vapor and collects it in an underground tank or a vapor processing device.

Reference numeral 8 in FIG. 8 is a nozzle hook, and the nozzle hook 8 is provided with a nozzle switch SW.

Next, the vapor recovery device 10 comprising the fluid motor 11 and the vapor suction blower 21 will be explained. Figure 1 is a front view showing the outline of this device, and Figure 2
is a plan view thereof, and FIG. 3 is a sectional view taken along line II shown in FIG. 2, and FIGS. 4, 5, and 6 are views taken along line II-II, line III-III, and line IV-IV shown in FIG. FIG.

The vapor recovery device 10 is composed of a fluid motor 11 and a vapor suction blower 21, and the casing 12 of the fluid motor 11 and the casing 22 of the vapor suction blower 21 are connected via a connecting casing 31 as shown in FIG. The rotor chamber 13 on the motor side is connected to the flange 3.
The rotor chamber 23 on the blower side is connected to the vapor recovery pipe 9 via a flange 33. Both of these casings 12, 22 have the same shape, and a pair of four-lobed rotors 14, 14, 24 having the same shape are located in the rotor chambers 13, 23 on the motor side and the blower side.
, 24 are rotatably disposed in a meshing relationship with each other, and each rotor 14, 14 in the rotor chamber 13 on the motor side
is a fluid motor 11 that drives a vapor suction blower 21
and each rotor 24 in the rotor chamber 23 on the blower side.
, 24 are configured as a suction blower 21 for sucking vapor.

Each rotor 14, 14, 24, 24 is shown in FIG.
As shown in the perspective view, it is a four-lobed type made of synthetic resin,
The rotor has a shape that is smoothly twisted spirally by 90° in the rotational direction of the rotor from one end a to the other end b. This suppresses pulsations occurring in the fuel oil flowing in the fuel supply pipe 1 and the vapor flowing in the vapor recovery pipe 9, thereby allowing smooth fuel supply and vapor recovery.

A shaft 34 embedded in one rotor shaft 15 of the fluid motor 11 passes through a partition wall 35 of the connection casing 31, and a drive gear 17 is attached to the end of the shaft 34 via a one-way clutch 16. This drive gear 17 is connected to a shaft 3 installed on one rotor shaft 25 on the vapor suction blower 21 side.
As shown in FIG. 6, the driven gear 27 fixed at the end of the vapor suction blower 2 meshes with the intermediate gear 26 via the intermediate gear 26.
It is configured to transmit rotational driving force to 1. This driven gear 27 is the rotor 2 of the vapor suction blower 21.
4 and 24 at a speed that is 2 to 2.5 times the rotational speed of the rotors 14 and 14 of the fluid motor, that is, the amount of vapor discharged exceeds the amount of oil supplied by about 13 to 35% in volume. The gear is formed as a gear having a correspondingly smaller number of teeth than the drive gear 17 so that Furthermore, by interposing the one-way clutch 16 between the drive gear 17 and the shaft 34, if more vapor than the suction capacity of the suction blower 21 flows from the fuel tank side, the pressure of the vapor will cause the rotor to The shaft 25 is rotated at a high speed to enable a large amount of vapor to be recovered, and even after the oil supply is stopped and the fluid motor 11 is stopped, the rotors 24 and 24 are rotated by the vapor flowing in the vapor recovery pipe 9 to collect the vapor. configured to permit emissions.

Furthermore, between the part of the casing 12 located downstream of the rotors 14, 14 of the fluid motor 11 and the part of the casing 22 located upstream of the rotors 24, 24 of the vapor suction blower 21, there is a gap between each casing 12, 22. A communication hole 19 is formed, which includes small holes 12a and 22a that are open to each other, and a pipe 18 that communicates between the small holes 12a and 22a. Through this communication hole 19, a part of the fuel oil pumped to the fluid motor 11 by the oil supply pump 3 is guided into the casing 22 of the vapor suction blower 21, between the rotors 24, 24 that mesh with each other, and between the rotors 24, 24. The lubricating oil is supplied between the inner surfaces of the casing 22 and the rotor 24
, 24 to ensure smooth rotation.

Note that the reference numeral 37 in FIG.
38 is a bearing holding member, and 39 is a seal for the shaft 34.

In the vapor recovery device of the refueling system configured as described above, when the refueling nozzle 2 is removed from the nozzle hook 8, inserted into the refueling port of the automobile, and the lever is pulled, the refueling device driven by the pump motor M is removed. A pump 3 pumps up fuel oil from an underground tank and sends it into the fuel tank via a fuel supply pipe 1 and a fuel nozzle 2. The fluid motor 11, which has received rotational driving force due to this oil supply, is connected to the intermediate gear 26 by the drive gear 17 at the end of the rotor shaft 15.
The rotational driving force is transmitted to the driven gear 27 that meshes with the driven gear 27, and the rotor shaft 25 coupled to the driven gear 27 is rotated, and thus the rotors 24, 24 are rotated to suck vapor in the fuel tank generated by refueling. Collect in underground tanks or vapor recovery equipment.

At this time, since the driven gear 27 is formed as a speed increasing gear having a smaller number of teeth than the drive gear 17, the vapor suction blower 21 is connected to the rotors 14, 14 on the fluid motor 11 side. Rotor 24 of the same shape
, 24 are used, the vapor suction blower rotates at a higher speed than the fluid motor 11 and sucks vapor in an amount exceeding the amount of oil supplied, and the amount of vapor generated during refueling exceeds the amount of oil supplied. Also, the vapor is sufficiently sucked and collected.

Furthermore, since the shaft 34 installed on the rotor shaft 15 on the fluid motor 11 side is connected to the drive gear 17 via the one-way clutch 16, there is no connection between the fuel oil and the fuel tank during refueling. Even during refueling or after refueling when there is a large temperature difference between the two gases and a large amount of vapor is generated in the fuel tank, the pressure of the vapor transmitted through the vapor recovery pipe 9 causes the vapor suction blower 21 to Rotor 24
, 24 rotate without being restricted by the drive gear 17 and recover vapor without creating abnormal pressure in the fuel tank.

On the other hand, a part of the fuel oil pumped by the oil supply pump 3 is guided into the casing 22 on the side of the vapor suction blower through the communication hole 19 consisting of the small holes 12a, 24a and the pipe 18, and is introduced into the casing 22 on the side of the vapor suction blower. , 24 and the inner surface of the casing 22 to function as lubricating oil, and can rotate sufficiently smoothly even with vapor pressure from the fuel tank. At this time, by providing the fluid motor 11 downstream of the oil supply pump 3 and upstream of the flow meter 4, it is possible to connect the inside of the casing 12 of the fluid motor 11 to the inside of the casing 22 of the vapor suction blower 21 via the communication hole 19. Even if a portion of the fuel oil is supplied, the amount of fuel oil supplied from the fuel supply nozzle to the fuel tank via the fuel supply pipe line 1 is accurately measured by the flowmeter 4.

Furthermore, in the above description, the rotor is of a four-lobed type, and the rotor is twisted by 90 degrees from one end to the other end.
1 in the rotational direction of the rotor from one end of the rotor to the other end.
The shape may be twisted by 20 degrees.

[0025]

According to the vapor recovery device in the fuel supply system of the present invention as described above, a portion of the fuel oil pumped by the fuel supply pump is opened at one end in the casing of the fluid motor, and the other end is connected to the vapor suction blower. Since the oil is supplied as lubricant through a communication hole opened in the casing part located upstream of the rotor, the vapor suction blower rotor rotates smoothly, vapor can be effectively discharged, and the life of the rotor is extended. In addition, it has the effect of being able to remove wear powder from the rotor.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of a vapor recovery device in a fuel supply system according to the present invention.

FIG. 2 is a side view of the vapor recovery device shown in FIG. 1.

FIG. 3 is a sectional view taken along line II in a plan view of the vapor recovery device shown in FIG. 2;

[Fig. 4] I in the front view of the vapor recovery device shown in Fig. 1
It is a sectional view along the I-II line.

FIG. 5 is a sectional view taken along line III-III in FIG. 1;

6 is a sectional view taken along the line IV-IV in FIG. 1. FIG.

FIG. 7 is a perspective view of a rotor used in this example.

FIG. 8 is a configuration diagram showing an example of a refueling device equipped with a vapor recovery device.

[Explanation of symbols]

1...Refueling pipe line 2...Refueling nozzle 3...Oil pump 4...Flow meter 9...Vapor recovery pipe 11...Fluid motor 12...Casing 14...Rotor 16...One-way clutch 19...Communication hole 21...Blower for vapor suction 22...Casing 24...Rotor

Claims (3)

[Claims] [Claim 1] A refueling pipe line leading from a refueling pump to a refueling nozzle, a flow meter for measuring the flow rate in the refueling pipe line, a fluid motor disposed in the middle of the refueling pipe line and including a rotor and a casing, and a refueling line. a vapor recovery pipe leading from a nozzle to a vapor discharge end; a vapor suction blower disposed in the vapor recovery pipe and equipped with a rotor and a casing driven by the fluid motor; and one end opening into the casing of the fluid motor. A vapor recovery device in an oil supply device, the other end of which is open to a casing portion located upstream of a rotor of a vapor suction blower. 2. The vapor recovery device for a fuel supply system according to claim 1, wherein the fluid motor is provided downstream of the fuel pump and upstream of the flow meter. 3. The vapor recovery device for a fuel supply system according to claim 1, wherein the rotor has a four-lobed shape and is twisted by 90° in the rotor rotational direction from one end of the rotor to the other end.