JP3216695B2 - Vapor recovery device in refueling equipment - Google Patents

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 installed in a fueling device.

[0002]

2. Description of the Related Art When a highly volatile fuel oil such as gasoline is supplied to an automobile fuel tank, vapor is generated in the automobile fuel tank in proportion to the discharge amount of the fuel oil.
Since this is released into the atmosphere, there is a problem of danger of ignition and also environmental pollution.

[0003] For this reason, Japanese Patent Laid-Open Publication No.
As disclosed in Japanese Patent Application Laid-Open No. 4-44998, a fluid suction motor is connected in the middle of an oil supply pipe, and a vapor suction blower constituted by accommodating two rotors in a rotor chamber formed by a casing is provided. It is provided in the middle of the paper recovery line, and the power from the fluid motor by the fuel oil flowing through the oil supply pipe is transmitted to the vapor suction blower via the speed increasing gear, and the vapor of the automobile fuel tank is used as the processing means. Recovery has been done.

[0004]

According to this, since the vapor of the vehicle fuel tank can be sucked at a suction amount equal to or larger than the amount of the fuel oil supplied to the vehicle fuel tank at the time of refueling, the vehicle fuel tank is discharged to the atmosphere of the vapor. However, there is a problem that the device is complicated and requires a large size because a speed-increasing gear is required. The present invention has been made in view of such a problem, and its purpose is to simplify the structure and reduce the size by increasing the suction amount of the fluid pump without requiring a speed increasing mechanism. It is an object of the present invention to provide a vapor recovery device for a fueling device which can achieve the following.

[0005]

According to the present invention, there is provided an unbalanced vane type fluid motor which is connected in the middle of an oil supply pipe for connecting an oil supply pump and an oil supply nozzle. An equilibrium vane-type fluid pump, which is connected in the middle of a vapor recovery line connecting the vapor collector at the tip of the refueling nozzle and the vapor treatment means and is directly connected to and driven by the unbalanced vane-type fluid motor, In addition, the vapor is sucked at a flow rate larger than the flow rate of the fuel oil and proportional to the flow rate of the fuel oil while simplifying the structure and reducing the size by eliminating the need for the timing gear.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a first embodiment of the present invention. FIG. 1 shows an embodiment of an oil supply device to which a vapor recovery device of the present invention is applied. In the drawing, reference numeral 1 denotes an oil supply pipe for guiding fuel oil in an oil storage tank to an oil supply nozzle 2, In the middle of this, the pump motor 3
Pump 4, driven by the above, an unbalanced vane type fluid motor 20 of a vapor recovery device 5 described later, and a flow meter 7 for measuring the amount of refueling are connected.

The flow meter 7 is provided with a flow rate pulse transmitter 8 for outputting the measured flow rate as a flow rate pulse. The flow rate pulse is converted into a lubrication amount by a control device 9 and the lubrication amount is displayed on a display 10. Let it.

Reference numeral 13 denotes a vapor collection line, one end of which is connected to a vapor collector 14 provided at the tip of the cylinder of the refueling nozzle 2, and the other end of which is connected to vapor processing means (not shown). The paper collection device 5 is connected.

Reference numeral 19 in the drawing denotes a nozzle switch which is provided in the vicinity of the nozzle holder 18 and outputs a signal for releasing the nozzle, and L and V indicate the flows of fuel oil and vapor, respectively.

2 and 3 show one embodiment of a vapor recovery apparatus according to the present invention. The vapor recovery apparatus 5 includes an unbalanced vane type fluid motor 20, a balanced vane type pump 30, It is composed of

The unbalanced vane type motor 20 has a first casing 24 having an inlet 21 connected to an oil supply pump, an outlet 22 connected to the flowmeter 7, and a rotor chamber 23.
And a rotor 2 attached to a common rotating shaft 25 described later.
6 and a plurality of rotors, 5 in this embodiment.
The slits 26a are provided, and the vanes 27, 27 are movably inserted in the slits 26a therein so that the tips of the vanes 27 rotate while sliding in the rotor chamber.

At the center of the casing 24, the end of the vane 27 is brought into contact with the end of the
3 is formed with a vane guide surface 24a which is in pressure contact with the inner surface.

A common rotary shaft 25 extends from the rotor chamber 23 to a rotor chamber 33 of the balanced vane pump 30 through a second casing 36 to be described later.
Rotor 2 and the second casing 36
Bearings 28, 28 provided so as to sandwich
It is supported rotatably.

On the other hand, the equilibrium vane type pump 30 has an inlet 31 connected to the vapor collector 14, an outlet 32 connected to the vapor processing means (not shown),
1, distribution flow paths 31a, 31b connecting the outlet 32 and the pump action chambers 33a, 33b of the rotor chamber 33 described later;
A lid 35 formed with 32a and 32b, and a rotor chamber 33
And a rotor 37 provided on the rotating shaft 25.

The rotor chamber 33 provided in the second casing 36 has an inlet 3 so that the rotational axis 25 is a center of symmetry.
The two pump action chambers 33a, 3
3b is formed to have an ellipse centered on the rotation axis 25 or a shape approximating the ellipse, or a shape formed by displacing two circles at equal distances so that the rotation axis is a symmetrical point. , 33b are the distribution channels 3 of the lid 35.
They are connected to an inlet 31 and an outlet 32 via 1a, 31b, 32a, 32b.

A slit 3 extending in the radial direction is provided in the rotor 37.
Plural 7a, five in this embodiment, are provided, and a vane 38 is inserted into each slit 37a so as to be movable in the outer peripheral direction by centrifugal force accompanying the rotation of the rotor 37.
The rotor 37 and the vane 38 have substantially the same size as the rotor 26 and the vane 27 of the unbalanced vane type fluid motor 20.

A seal member 39 for preventing vapor from leaking from the rotating shaft 25 is fitted on the motor 20 side of the second casing 36, and the unbalanced vane type fluid motor 2 is provided.
The vane guide surface 36a is also formed on the side of the rotor chamber 23 where the vane 27 contacts the center end of the vane 27 and presses the tip of the vane 27 against the inner surface of the rotor chamber 23.

Reference numerals 21a and 22a in the figure denote a double inlet and a double outlet, respectively, which branch off from the inlet 21 and the outlet 22, respectively, and communicate with the rotor chamber 23.

As described above, since the rotor chamber 33 of the balanced vane type pump 30 is divided into two regions and the two pump operation chambers 33a and 33b function as pumps, the amount of fluid passing through the unbalanced vane type motor 20 is reduced. About twice as much fluid can be processed.

In this embodiment, when the refueling nozzle 2 is removed from the nozzle holder 18, the nozzle switch 19 is closed, and the driving motor 3 of the refueling pump 4 rotates. When the fueling nozzle 2 is inserted into the fueling port of the vehicle fuel tank, the vapor collector 14 closes the fueling port. When refueling is started in this state, fuel oil from the refueling pump 4 flows from the refueling nozzle 2 to the fuel tank through the refueling line 1.

Since the fuel oil L flowing from the oil supply line 1 applies a rotational force to the rotor 26 of the unbalanced vane type fluid motor 20, the rotor 37 of the balanced vane type pump 30 connected to the rotor 26 by the rotating shaft 25 is used. Is driven to rotate.

Vane 2 of unbalanced vane type fluid motor 20
7 is the guide surface 2 of each casing 24, 36 on the rotating shaft side.
4a, 36a forcibly contact the inner surface of the rotor chamber 23, without losing the pressure of the fuel oil,
It reliably contacts the inner surface of the rotor chamber 23, efficiently converts the flow of the fuel oil into rotational motion, and discharges the fuel oil L 'to the flow meter 7.

The unbalanced vane type fluid motor 20 is
Since both sides of the rotor 26 are supported by the bearings 28, wear of the rotating shaft 25 due to unbalanced force is prevented as much as possible.

This rotation causes the equilibrium vane pump 30
The two pump action chambers 33a and 33b on the side of the inlet 31 and the outlet 32 function independently as pumps, respectively, and are connected to the vapor collector 1 via the distribution channels 31a and 31b.
4 is sucked at a flow rate about twice as large as the fuel oil discharged from the nozzle 2, and the vapor V 'is discharged to vapor processing means (not shown) through the distribution flow paths 32a and 32b.

As described above, since the vapor of the vehicle fuel tank is sucked at a suction amount almost twice as much as that of the fuel oil flowing into the fuel tank, the amount leaked to the external environment is extremely small, and most of the fuel oil is processed by the vapor processing means. become.

Further, the equilibrium vane type pump 30 maintains the equilibrium state even during the rotation because the rotor 37 is attached to the rotating shaft 25 with its center at the center.
8 is reliably brought into contact with the inner surface of the rotor chamber 33 by centrifugal force, so that a reliable pump action is achieved.

The fuel oil discharged from the refueling nozzle 2 is measured by the flow meter 7 to output a flow rate pulse from the flow rate pulse transmitter 8 and displayed on the display 10 by the control device 9 as a refueling amount.

[0028]

As described above, according to the present invention, an unbalanced vane-type fluid motor connected substantially in the middle of an oil supply pipe connecting an oil supply pump and an oil supply nozzle, and a vapor collector at the tip of the oil supply nozzle are provided. And a balanced vane-type fluid pump that is connected in the middle of a vapor recovery line connecting the vapor-treating means and is directly connected to and driven by the unbalanced vane-type fluid motor. The mechanism can be omitted, and the vapor can be sucked at a flow rate larger than the flow rate of the fuel oil and proportional to the flow rate of the fuel oil while simplifying the structure and reducing the size.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of an oil supply device using a vapor recovery device of the present invention.

FIG. 2 is a sectional view showing an embodiment of a vapor recovery apparatus of the present invention.

FIGS. 3A and 3B are respectively AA in FIG.
It is sectional drawing in the line and the BB line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil supply pipe substantially 2 Oil supply nozzle 4 Oil supply pump 5 Vapor recovery device 13 Vapor recovery line 14 Vapor collector 20 Unbalanced vane type fluid motor 24 Casing 25 Rotation shaft 26 Rotor 27 Vane 28 Bearing 30 Balanced vane pump 36 Casing 37 Rotor 38 Vane 39 Seal

Continuation of the front page (56) References JP-A-8-58899 (JP, A) JP-A-4-311498 (JP, A) JP-A-54-115411 (JP, A) JP-A-4-44999 (JP) , A) JP-A-6-167279 (JP, A) JP-A-5-263772 (JP, A) JP-A-50-101913 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B67D 5/58

Claims (4)

(57) [Claims] 1. An unbalanced vane type fluid motor connected in the middle of an oil supply pipe connecting an oil supply pump and an oil supply nozzle, and a vapor collector and a vapor processing means at a tip of the oil supply nozzle. And a balanced vane type fluid pump which is connected in the middle of the vapor recovery pipeline and is directly connected to and driven by the unbalanced vane type fluid motor. 2. The rotor of the unbalanced vane-type fluid motor and each rotor of the balanced vane-type pump are connected by a common rotating shaft, and are supported by bearings only at positions sandwiching the rotor of the unbalanced vane-type fluid motor. The vapor recovery device according to claim 1, which is pivotally supported. 3. The rotor of the unbalanced vane type fluid motor and the rotor of the balanced vane type pump are mounted on a common rotating shaft, and the unbalanced vane type pump side of the rotating shaft is sealed. A vapor recovery device in the fueling device according to claim 1. 4. A vane of the unbalanced vane type fluid motor is forcibly urged to an outer peripheral side by a guide surface formed on a casing, and each vane of the balanced vane type pump is moved to an outer peripheral side by centrifugal force. The vapor recovery device in the oil supply device according to claim 1, which is energized.