JPH0678118B2 - Refueling nozzle - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to an oil supply nozzle used in an oil supply station or the like and used in an oil supply device for supplying fuel oil such as gasoline or light oil to an automobile.

(B) Conventional technology and its problems A refueling device has a refueling nozzle connected to its downstream end, and a manual valve mechanism provided inside the refueling nozzle is opened / closed to provide a refueling amount or a refueling amount required by a customer. Has been done.

At the end of these refueling operations, the residual oil in the cylinder tip of the refueling nozzle should be completely drained, but in many cases the oil is left so quickly that the next refueling operation will occur. The following problems occur at the start.

When the cylinder tip is set to the fueling port of the vehicle and directed downward, residual oil is discharged, which pollutes or scatters the vehicle and causes fire, pollution, and even slip accidents.

Also, in the case of a device equipped with a mechanism (contamination proof) for detecting the type of oil on the automobile side, the oil discharged from the refueling nozzle is judged to be the oil of the automobile, and the oil type is erroneously judged. there's a possibility that.

Accidentally supplying oil of a different oil type will cause engine trouble, and a large amount of cost will be required to repair and dispose of the oil.

On the other hand, a method has also been adopted in which a valve that opens when the pump pressure acts on the downstream side of the cylinder tip is provided to suppress the discharge of residual oil.
In this case, since the valve portion becomes large, workability is impaired.

(C) Configuration and Action for Solving Problems The present invention is to solve the above problems by controlling the discharge timing or discharge speed of the residual oil of the previous refueling. The configuration is a refueling nozzle that includes a flow passage that flows through the inside of the main body, a valve mechanism that opens and closes the flow passage, and a cylinder tip at the downstream end, and is connected to an oil feeding device via a hose. A residual oil storage chamber connected to the nearest cylinder tip side flow path is provided.Action at the end of refueling, such as returning the refueling nozzle to a fixed position when not refueling, or by pointing the cylinder tip upwards Is temporarily stored, and discharge from the storage chamber is started by an action at the start of refueling, for example, starting of a pump or completion of oil type determination, or slowly when the cylinder tip is directed downward.

(D) Embodiment FIG. 1 shows the structure of an oil supply device having an oil type determination function. Reference numeral 1 denotes a pump, which is rotationally driven by a pump motor 2 and has an oil supply pipe 3 in which a check valve 4 is inserted. The oil is pumped out from an oil tank (not shown).

5 is a flow meter that measures the pumped oil, and 6 is a pulse transmitter that outputs a number of flow rate pulse signals a corresponding to the amount measured by the flow meter 5.

7 is a refueling nozzle, and a tube tip 8 is connected to the downstream end of the flow meter 5
And are connected via a hose 9.

10 is a control unit that houses an electric circuit described later, 11 is an indicator for the amount of refueling, 12 is a nozzle case that stores the refueling nozzle 7 when not refueling, 13 is only when the refueling nozzle 7 is present in the nozzle case 12. A nozzle detection switch that outputs a nozzle detection signal b, 14 an oil type detection sensor unit, 15 a three-way switching valve,
Reference numeral 16 is an air supply pipe to which pressurized air is supplied, 17 is a gas suction pipe, and 18 is an operation pipe.

In FIG. 2, reference numeral 19 denotes a main body of the oil supply nozzle 7 through which an oil flow passage 20 flows, and a valve mechanism 23 composed of a main valve 21 and a sub valve 22 receives an oil flow and opens. A valve mechanism 25 including a negative pressure generating valve 24 that generates a negative pressure by its action is housed.

Reference numeral 26 is a lever, and when the lever 26 is rotated counterclockwise around the shaft 27 in the drawing, the valve shaft 27 and the operating shaft 29, which are detachably engaged by two rollers 28, are moved to the right together. And the main valve 21 is opened first.

When the valves 21 and 22 open and the oil flows, the negative pressure is generated by the fluid pressure.
Is pushed open.

Then, the negative pressure is generated in the negative pressure passage 30 by the action of the oil passing through the valve mechanism 25.

This negative pressure passage 30 is an upper chamber partitioned by a diaphragm 31 into upper and lower parts.
32 and a negative pressure compensating tube having an opening 33 at one end of the barrel tip 8.
34 is connected to the negative pressure compensating tube.
It is blocked by air supplied through 34.

However, when the opening 33 is closed due to the rise of the oil level, the air supply is cut off, so it is not possible to prevent the rise of the negative pressure value,
This increase in the negative pressure value acts on the upper chamber 32 to displace the diaphragm 31 upward with the roller 28, releasing the engagement state between the operating shaft 29 and the valve shaft 27, and closing the valve mechanism 23 by the pressure of oil. Will be done.

These operations are already known, and therefore detailed description thereof will be omitted.

35 is an opening at one end of the gas suction pipe 17, and the other end is connected to the oil type detection sensor unit 14.

36 and 37 are through holes drilled in the immediate vicinity of the downstream side of the valve mechanism 25, and 38 is a through hole drilled in the upstream flow path of the valve mechanism 23.

3A is a view of the refueling nozzle 7 in FIG. 2 seen from above, and a working chamber 40 and a residual oil storage chamber 41 partitioned by a diaphragm 39 are formed, and the diaphragm 39 is actuated by a spring 42. Side is always biased to the residual oil storage chamber
41 is connected to the through hole 36, and the working chamber 40 is connected to the working pipe 18.

FIG. 6 shows the structure of the oil type detection sensor unit 14, in which the following devices are installed.

43 is a shutoff valve, 44 is an ejector for generating a negative pressure in the branch pipe 51 by feeding pressurized air, 45 is a port A, B,
It is a three-way switching valve equipped with C.

The three-way switching valve 15 has ports D, E and F, respectively.

FIG. 8 is a diagram showing the configuration of the control unit 10 in which the following electric circuits are housed.

A counting circuit 47 counts the number of flow rate pulse signals a, outputs the counted value as a lubrication amount signal c, and displays it on the display 11 as the lubrication amount.

Note that this count value is reset to zero by the disappearance of the nozzle detection signal b output while the nozzle detection switch 13 is detecting the nozzle 7.

An oil type determination circuit 48 determines whether or not to refuel based on the oil type signal d output from the oil type sensor 46 (whether or not it matches the oil type of the refueling device), and permits it. Only at this time, the permission signal e (one pulse) is output, while the nozzle detection signal b disappears, the valve opening signal f is output, and the switching signal h is output for a certain period of time.

Reference numeral 49 is a motor control circuit, which operates between the input of the permission signal e and the input of the nozzle detection signal b (nozzle 7
(While being returned to), the energizing signal i is output.

A valve control circuit 50 outputs a switching signal j while the energizing signal i is being input.

Next, Fig. 1, Fig. 2, Fig. 3A, Fig. 3B, Fig. 6, Fig. 8
A first embodiment will be described with reference to FIGS.

When the nozzle 7 is stored in the nozzle case 12 and waiting for refueling (the cylinder tip 8 faces upward), the port E and the port F of the three-way switching valve 15 are connected to each other, so that the working chamber is connected via the working pipe 18. No pressurized air is sent to 40, the diaphragm 39 is in the state shown in FIG. 3A, and the residual oil from the previous refueling is stored in the residual oil storage chamber 41.

When the nozzle 7 is removed from the nozzle case 12 and the nozzle detection signal b disappears, the previous count value of the counting circuit 47 is reset to zero, and at the same time, the oil type determination circuit 48 outputs the valve opening signal f and the switching signal h.

The shutoff valve 43 is opened by the generation of the valve opening signal f, and the pressurized air in the air supply pipe 16 is sent to the oil type sensor 46 after passing through the ejector 44.

On the other hand, when switching signal j is generated, port A and port B
The three-way switching valve 45 that was connected to and is switched so that port A and port C are connected and suction through the opening 35 of the gas suction pipe 17 begins.

After passing through the three-way switching valve 45, the sucked gas is mixed and diluted with the pressurized air coming from the direction of the shutoff valve 43 by the ejector 44 and sent to the oil type sensor 46.

An oil type signal d corresponding to the type of gas is output from the oil type sensor 46, and when the oil type determination circuit 48 determines that there is no error in the oil type, a permission signal e is generated, but if it is determined that there is an error in the oil type, a notification not shown is issued. Is performed.

When the permission signal e is generated, the motor 2 is energized to start refueling, and at the same time when the motor is energized, the switching signal j is output from the valve control circuit 50, and the port E and the port F until then.
The three-way switching valve 15 that had been in communication with and is switched to connect the port E and the port D, and the pressurized air is sent into the working chamber 40 via the operation pipe 18.

Then, as shown in FIG. 3B, the diaphragm 39 is displaced in the direction of the residual oil storage chamber 41 against the bias of the spring 42, and the residual oil stored in the residual oil storage chamber 41 at the time of the previous refueling is removed. Through hole 36
To be discharged through.

When refueling starts, the number of flow rate pulse signals a output from the pulse transmitter 6 is counted by the counting circuit 47, and the counted value is displayed on the display 11 as the refueling amount.

When refueling is completed and the nozzle 7 is returned to the nozzle case 12 (the cylinder tip 8 is stored so as to face upward), the nozzle detection switch 13 detects the nozzle 7 and the nozzle detection signal b is generated.

In response to the generation of the nozzle detection signal b, the valve opening signal f disappears, that is, the shutoff valve 43 is closed, and the motor 2 is deenergized due to the disappearance of the energizing signal i, and the three-way switching valve 15 is switched, that is, the ports E and F. Communication is conducted.

Due to the communication between port E and port F, the working chamber 40
Since the pressurized air acting on the working chamber 40 is cut off and the working chamber 40 becomes atmospheric pressure, the diaphragm 39 is urged by the spring 42.
Is displaced toward the working chamber 40, and the residual oil immediately downstream of the valve mechanism 25 is sucked and stored in the residual oil storage chamber 41 through the through hole 36 and waits for the next oil supply.

When there are a plurality of valve mechanisms in the nozzle as in the present embodiment, the valve mechanism described in the above claims refers to the valve mechanism on the most downstream side.

In the case of this first embodiment, the through hole 3 shown in FIG.
7,38 is no longer needed.

Next, a second embodiment is shown in FIG. 1, FIG. 2, FIG. 3A, FIG. 3B,
The description will be continued based on FIG. 7, FIG. 8 and FIG. 10, but the same functional parts as those in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

First, the difference between the first embodiment and the second embodiment is that the former sends pressurized air to the working chamber 40 by an independent air circuit, whereas the latter sends to the gas suction pipe 17. There is no change in the other mechanism because the independent air circuit is omitted by using the pressurized air.

When the nozzle 7 is removed from the nozzle case 12, and the gas is sucked by the gas suction pipe 17 by opening the shutoff valve 43 and communicating the ports A and C in the three-way switching valve 45, the seventh
As shown in the figure, the gas is the gas suction pipe 17, port A, port
C and the branch pipe 51 flow in this order and are mixed with the pressurized air passing through the ejector 44.

On the other hand, air is also sucked from the working chamber 40 via the actuating pipe 18, but there is no particular problem because it works in the direction of expanding the volume of the residual oil recovery chamber 41.

When it is judged that the oil type is correct, the motor 2 is energized, and at the same time, when the port A and the port B of the three-way switching valve 45 are connected due to the disappearance of the switching signal h, the pressurized air is supplied to the port B and the port.
A, cleaning is started by flowing to the gas suction pipe 17, further flowing into the actuation pipe 18, the diaphragm 39 is displaced against the bias of the spring 42, and the residual oil in the residual oil storage chamber 41 is passed through. 36
Will be discharged from.

When refueling is completed and the nozzle 7 is returned to the nozzle case 12, the shutoff valve 43 is closed at the same time as the motor 2 is deenergized, so that pressurized air is not supplied to the working chamber 40 and the spring 42 urges it. The diaphragm 39 is displaced in the direction of expanding the residual oil storage chamber 41, and the oil remaining on the downstream side of the valve mechanism 25 is sucked and collected in the residual oil storage chamber 41.

Therefore, in the second embodiment, the valve control circuit 50 and the three-way switching valve 15 shown in FIG. 8 in addition to the through holes 37 and 38 shown in FIG. By branching out at the nozzle 7, the number of parts can be reduced as compared with the first embodiment.

Continuing to explain the third embodiment, when the other end of the working tube 18 whose one end is connected to the working chamber 40 is connected to the through hole 38 and the diaphragm 39 is displaced by the pressure of air, the rotation of the motor 2 occurs. Sometimes the working chamber 40 is expanded, that is, the residual oil is discharged, and when the motor 2 is stopped, the residual oil storage chamber 41 is expanded, that is, the residual oil is sucked and recovered, and the same operation as in the first and second embodiments is performed. You can

At this time, the through hole 37 is unnecessary.

Further, in the first, second and third embodiments, when the cylinder tip 8 is directed downward prior to refueling, a little oil in the residual oil storage chamber 41 flows out from the through hole 36. It suffices to reduce the size of the through hole 36 or to provide a sponge-like oil-resistant sponge in the through hole 36.

Further, as shown in FIG. 4A, when the residual oil storage chamber 41 is filled with the elastic oil resistant sponge 52, when pressurized air or oil pressure acts on the working chamber, as shown in FIG. 4B. Since the residual oil absorbed by the sponge 52 can be discharged from the opening 36, the same effect as the above case can be obtained and the discharge of oil can be completely controlled.

Next, a fourth embodiment will be described with reference to FIGS. 2 and 5. The residual oil storage chamber 41 is an empty chamber simply connected to the through hole 36, and when the refueling is completed and the nozzle 7 is the nozzle case. When the cylinder tip 8 faces upward by being returned to 12, the residual oil immediately downstream of the valve mechanism 25 flows into the residual oil storage chamber 41 through the through hole 36 in a natural flow, and the cylinder tip 8 is directed downward at the next refueling. When it is set to the oil filler port, it is gradually discharged.

In this case, it is effective to provide the through hole 37 as a vent for the residual oil storage chamber 41, and the one through hole 38 is unnecessary.

(E) Effect As described in detail above, the residual oil storage chamber is provided, and the residual oil is collected and discharged from the vicinity of the cylinder tip side of the valve mechanism by natural inflow and outflow by the posture of the nozzle or by the forced means. When the cylinder tip is directed downward, the residual oil is discharged at once, and there is no risk of causing vehicle stains, fire accidents, or erroneous determination of the contamination proof, and a refueling nozzle that can be used with confidence can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing the structure of a fueling device, FIG. 2 is a diagram showing the structure of a fueling nozzle, and FIGS. 3A, 4A, and 5 are views of the fueling nozzles of different embodiments as seen from above, FIG. 3B shows a different state of FIG. 3A, FIG. 4B shows a different state of FIG. 4A, FIG. 6 shows an air circuit in the first embodiment, and FIG. 7 shows a second embodiment. Figure showing the air circuit in the example,
FIG. 8 is a diagram showing an electric circuit of the oil supply apparatus, FIG. 9 is an operation flow of the first embodiment, and FIG. 10 is an operation flow of the second embodiment. 1 ... Pump, 2 ... Motor, 5 ... Flowmeter 6 ... Pulse transmitter, 7 ... Oil supply nozzle, 8 ... Cylinder tip 10 ... Control section, 13 ... Nozzle detection switch 15,45 ... Three-way Switching valve, 17 …… Gas suction pipe 18 …… Operating pipe, 21 …… Main valve, 22 …… Sub valve 23,25 …… Valve mechanism, 24 …… Negative pressure generation valve 36, 37, 38 …… Through hole , 39 …… diaphragm 40 …… working chamber, 41 …… residual oil storage chamber, 43 …… shut-off valve 44 …… ejector, 46 …… sensor, 52 …… sponge

Claims (1)

[Claims] 1. A liquid supply nozzle comprising a flow passage that flows through a main body, a valve mechanism that opens and closes the flow passage, a tip of a cylinder at a downstream end, and is connected to an oil feeding device via a hose. A refueling nozzle characterized in that a residual oil storage chamber is provided which is connected to the flow path on the cylinder tip side in the immediate vicinity of the mechanism.