JPH0442278B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid supply nozzle used when supplying a liquid such as water or oil to a container such as a tank. This invention relates to a liquid supply nozzle that automatically shuts off liquid supply.

[Conventional technology and its problems]

A so-called auto nozzle, which is mainly used for gasoline refueling, is used as a nozzle that is often used when supplying liquid to a container such as a tank. The only problem with this is that the structure is such that the supply is cut off when the liquid level reaches the tip of the nozzle to prevent gasoline from overflowing from inside the tank, so the liquid level at which the supply is cut off cannot be adjusted freely depending on the tank. There is. Alternatively, some systems use a scale to cut off the liquid supply when a predetermined weight is reached, but with this method, a separate scale must be installed and the tank must be transported. Therefore, there are problems such as it takes time.

Furthermore, as an alternative to these methods, there is a method that uses a separate level switch to detect the liquid level, but this method cannot be used in places where space is limited, and the liquid supply port of the container is closed. If there is only one hole and the hole is large enough to fit only the nozzle, the level switch cannot be used.

In addition, for example, a device as shown in Japanese Patent Application Laid-Open No. 52-62584 has recently been developed. This is because the sensor is only held on the outer periphery of the nozzle, so there is also the problem that the sensor is easily damaged when inserted into the tank. In addition to this, there are also
There is also a device shown in Publication No. 84451, but since this is equipped with an ultrasonic transmitting element at the tip of the injection port of the filling machine, malfunctions are likely to occur when liquid is jetted out from the nozzle. If this gets wet with liquid, there will be problems such as it not working.

Furthermore, there is a device as shown in Japanese Utility Model Publication No. 53-9937, in which the liquid level detection is operated by a float mechanism fixed separately from the nozzle screwed into the tank, and the hole in the tank is Two locations are required, one for the float mechanism and one for the nozzle, and the installation of the nozzle is complicated, resulting in various problems such as the installation being time-consuming.

[Means for solving problems]

The present invention was invented for the purpose of solving the above-mentioned problems and providing a liquid supply nozzle with a simple structure and reliable operation.
In the liquid supply nozzle attached to the tip of the liquid supply pipe 6, a nozzle body 10 fitted with a stopper 66 for adjusting the amount of nozzle insertion into the container is connected to the tip of the liquid supply pipe 6 via a hose fitting 11. A guide pipe 50 having a passageway for guiding air supplied from an air source via a solenoid valve 5 on the core thereof.
The rear end of the guide pipe 50 is fixed to the pipe stopper 60 fixed to the rear part of the nozzle body 10, and the liquid level is adjusted to the bottomed guide 22 fixed to the tip of the guide pipe 50 by contact with the liquid. A guide case 30 having a built-in liquid level detecting means that outputs a signal in response to a change and covering this is fixed, and a lead wire 67 for guiding the signal from the liquid level detecting means to the outside is inserted into the guide pipe 50. On the other hand, an air hole 53 is formed at the tip of the guide pipe 50 in a direction orthogonal thereto, and a piston 51 that is operated by air supplied from an air source and passed through the guide pipe 50 is movably fitted. The guide pipe 50 is inserted into an air chamber A formed at the rear of the piston 51 between the piston 51, the nozzle ring 20 fixed to the nozzle body 10, and the bottomed guide 22 fixed to the nozzle ring 20. When air is supplied from the nozzle body 10, a gasket 52 that contacts and closes the tip of the nozzle body 10 is fixed,
When air is supplied to the air chamber A in response to a signal from the liquid level detection means, the piston 51 closes the tip of the nozzle body 10.

[Effect]

When the signal to start liquid supply is received, the solenoid valve 5 operates,
Operation valve 4 opens. On the other hand, due to the operation of this solenoid valve 5, air from the air source is cut off and the guide pipe 5
0 is open to the atmosphere. This is piston 5
1 moves forward, and liquid is supplied outward from the nozzle body 10. When the liquid is supplied in this way and the liquid level rises and approaches a preset position, the liquid level detection means is activated. As a result, the operating valve 4 receives a signal and starts a closing operation according to this liquid level, and as soon as it reaches the predetermined position, the operating valve 4 is completely shut off.
Liquid supply stops. Furthermore, since the solenoid valve 5 operates at the same time, air is supplied from the air source to the guide pipe 50, and the piston 51 moves back, so the piston 51 comes into contact with the tip of the nozzle body 10, and the nozzle is completely closed. be done. As a result, even if liquid remains in the nozzle, it will not leak out, making it easy to use.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.
In FIG. 3, 1 is a pump that supplies liquid from a liquid storage tank (not shown), and a strainer 2, a flow meter 3, and an operating valve 4 are connected to this pump 1. The pump 1 and the operating valve 4 are configured to operate in response to a supply start signal. In addition, this operation valve 4
is operated by a solenoid valve 5,
This electromagnetic valve 5 is configured to operate to supply air from an air source (not shown) to a liquid supply nozzle, which will be described later, and to discharge air in the liquid supply nozzle to the atmosphere. A liquid supply pipe 6 is connected to the operation valve 4, and a liquid supply nozzle whose tip end is inserted into a tank 7 is connected to this liquid supply pipe 6.

As shown in FIG. 1, the liquid supply nozzle hose fitting 11 to which the liquid supply pipe 6 is connected is connected to the nozzle main body 1.
A nozzle operating lever 12 is fixed to the opposite side of the nozzle body 10 to the hose fitting 11. Further, a guide pipe 50 is inserted on the center line of the nozzle body 10. This nozzle body 1
A nozzle ring 20 having a plurality of windows 21 formed on the outer periphery is fixed to the tip of the nozzle 0, and a bottomed guide 22 is fixed to the tip of this nozzle ring 20. Further, a guide case 30 having an opening 31 formed at its tip is connected to the bottomed guide 22. Inside this guide case 30, first and second floats 42 and 43, which can be raised and lowered independently, are arranged in series, and these floats 42 and 43 penetrate the bottomed guide 22 and protrude rearward. It is configured to slide along the bottomed pipe 32. In addition, each of the floats 42 and 43 is provided with a magnetic material (not shown).
are built in, and sensors (not shown) operated by the magnetic material are installed at positions in the bottomed pipe 32 corresponding to the respective floats to constitute the first and second float switches 40 and 41. There is.

Furthermore, the bottomed pipe 32 is connected to the bottomed guide 2.
It is loosely inserted into the guide pipe 50 whose tip end is fixed to 2. The guide pipe 50 is provided with a piston 51 that is slidable in the axial direction along the outer periphery and the inner surface of the nozzle ring 20, and a truncated conical packing 52 is fixed to the rear portion of the piston 51. Although the piston 51 is designed to move along the guide pipe 50, the piston 51 and the guide pipe 50 may be integrated so that the whole moves. On the other hand, a conical slope 13 is formed at the tip of the nozzle body 10, with which the packing 52 comes into contact when the piston 51 retreats. Further, an air hole 53 is formed in a direction perpendicular to the guide pipe 50 at a position close to the bottomed guide 22 of the guide pipe 50, and the lower part of the piston 51 and the bottomed guide 22 are connected to each other through the air hole 53. The guide pipe 50 communicates with an air chamber A formed between the nozzle ring 20 and the nozzle ring 20 .

Further, the rear end of the guide pipe 50 is fixed to pass through a pipe plug 60, and the pipe plug 60 is fixed to the rear of the nozzle body 10 together with a cover 61. A hose fitting 63 to which an air pipe 62 connected to the solenoid valve 5 is connected is attached to the cover 61, and air operated by the solenoid valve 5 is supplied between the pipe stopper and the cover 61 and guided. It is designed to enter pipe 50. The cover 61 also includes the bottomed pipe 3.
A connector 64 is attached to which a lead wire 67 for drawing out a signal from a sensor built into the guide pipe 50 is guided through the guide pipe 50. This connector 64 is normally a sealed type that prevents air from entering, and is connected to the solenoid valve 5 via a cable 65.

Furthermore, as shown in FIG. 4, the nozzle body 1
0 is fitted with a stopper 66 that fits into the liquid supply port 7a of the tank 7 and is movable along the nozzle body 10, thereby adjusting and fixing the nozzle at a predetermined position. Further, a groove is formed in this stopper 66 so that air in the tank can be discharged.

Next, the operation of this embodiment will be explained. As shown in FIG. 4, a stopper 66 is placed along the nozzle body 10 in advance according to the amount of liquid to be supplied into the tank 7.
is moved to adjust the liquid level, and then inserted into the liquid supply port 7a of the tank 7. After doing this, when a signal to start liquid supply is input, the pump 1 is driven as shown in FIG. 3. As a result, the liquid passes through the flow meter 3 and is supplied forward. At this time, since the electromagnetic valve 5 is operated, the operation valve 4 is opened, and the air pipe 62 communicating with the nozzle is opened to the atmosphere, so that the air is exhausted. Therefore, when liquid is supplied and this dynamic pressure acts, the piston 51
moves forward along the guide pipe 50, so the first
As shown in the figure, the window 21 is opened and the liquid supplied from the liquid supply pipe 6 is supplied into the tank 7.

In this way, when liquid is supplied into the tank 7 and the first float 42 at the tip of the liquid supply nozzle moves to a predetermined position, the first float switch 40 is actuated by the float 42, and this signal is sent to the solenoid valve 5. The operation valve 4 is closed to half its opening degree. For this reason, the supply amount decreases. As the liquid level rises, the second float 43 reaches a preset position, and the signal from the second flow switch 41 enters the electromagnetic valve 5. As a result, the operation valve 4 is further actuated and becomes completely closed. At the same time, the air pipe 6
The solenoid valve 5 connected to the solenoid valve 2 is closed from the atmosphere, and air from an air source (not shown) is supplied from the air pipe 62, so that it passes through the guide pipe 50 and enters the nozzle ring 20 from the air hole 53. The air is supplied to the air chamber A inside. As a result, the piston 51
moves back and the gasket 52 comes into contact with the conical slope 13 of the nozzle body 10, so the window 21 is closed and the supply of liquid is completely cut off. This prevents liquid remaining in the nozzle from being supplied or leaking out. This ends the supply of liquid to the tank 7. The liquid level in the tank 7 can be adjusted by adjusting the nozzle fixing position with respect to the stopper 66. Moreover, this stopper 6
6 has a tapered conical shape from the rear to the tip, so that even if the size of the liquid supply port 7a is slightly different, it can be fixed without replacing it.

FIG. 2 shows another embodiment of the present invention, in which, instead of the first and second float switches 40 and 41 as liquid level detection means of the previous embodiment, the tip of each float switch is located at a predetermined position. First and second determination pipes 70 and 71 are provided, and back pressure detection sensors (not shown) are connected to the first and second determination pipes 70 and 71, respectively. As a result, as in the previous embodiment, when the liquid level reaches the respective pipes 70, 71, the operation valve 4 is closed in stages. Further, in the first and second embodiments, two float switches and two determination pipes are provided, but the number is not limited to this number, and may be set as appropriate depending on the number of closing stages of the operation valve 4. Bye. Further, this liquid supply nozzle can be used regardless of the viscosity of the liquid. Further, in these embodiments, the solenoid valve 5 is used as a liquid supply device, but by attaching the solenoid valve 5 directly to the liquid supply nozzle, it can be used alone as a constant liquid level nozzle.

〔Effect of the invention〕

As is clear from the embodiments described above, the present invention provides a liquid supply nozzle attached to the tip of the liquid supply pipe 6, in which a positioning stopper 66 is attached to the tip of the liquid supply pipe 6 via a hose fitting 11 to adjust the nozzle insertion amount.
A guide pipe 50 having a passage for guiding air supplied from an air source through the solenoid valve 5 is inserted on the center line of the nozzle body 10, and a guide pipe 50 is inserted into the rear part of the nozzle body 10. The guide pipe 50 is attached to the pipe stopper 60 fixed to the
The rear end of the guide pipe 50 is fixed, and a guide case 30 is fixed to the tip of the guide pipe 50, which has a built-in liquid level detection means that outputs a signal in response to changes in liquid level due to contact with liquid. A lead wire 67 for guiding the signal from the liquid level detecting means to the outside is inserted through the lead wire 67, and an air hole 53 is formed at the tip of the guide pipe 50 in a direction perpendicular thereto. A piston 51, which is operated by air passing through the piston 51, is movably fitted, and a nozzle ring 20 fixed to the piston 51 and the nozzle body 10, and a bottomed bottom fixed to the nozzle ring 20 are mounted on the rear of the piston 51. When air is supplied from the guide pipe 50 to the air chamber A formed between the guide 22, the gasket 52 that contacts and closes the tip of the nozzle body 10 is fixed, and the signal from the liquid level detection means is fixed. When air is supplied to the air chamber A, the piston 51 closes the tip of the nozzle body 10.

Therefore, the liquid level in the tank cannot be adjusted constantly as in the conventional case, and the liquid level can be freely adjusted in the amount of liquid supplied depending on the tank. In addition, the liquid level can be adjusted by simply adjusting the stopper position, so the structure is simple, and the adjustment can be done immediately, making it easy to use. The liquid supply nozzle can be installed by simply pushing it into the tank's liquid supply port. It's okay, so the work is fast. In addition, the stopper has a thin conical tip, so it can be easily adapted to the size of the tank's liquid supply port, even if the size differs depending on the type of tank, making it easy to make fine adjustments. Therefore, there is no need to replace it each time.

Furthermore, since it has a built-in liquid level detection means that operates when it comes into contact with the surface of the liquid, and is equipped with an operating valve that operates in conjunction with this, it is possible to automatically stop the liquid at that liquid level, improving operability. In addition, since the float switch and the determination pipe are arranged above and below, the accuracy of measuring the amount of liquid to be supplied is improved, safety is also improved, and malfunctions are prevented. In addition, the guide pipe guides the lead wire that transmits the signal from the switch and also guides the air, so the number of parts and the size can be reduced.

Furthermore, the liquid level detection means that outputs the signal to adjust the supply amount is built into the guide case and is completely covered, so there is no chance of damage to this liquid supply nozzle when it is inserted into the tank. In addition, even if the nozzle were to be hit by some reason, the liquid level detection means would not be directly hit, resulting in unique effects such as being less likely to be damaged.

[Brief explanation of drawings]

1 is a sectional front view of a main part of the present invention, FIG. 2 is a sectional front view of a main part showing another embodiment of the present invention, FIG. 3 is a schematic diagram of a liquid supply device using the present invention, and FIG. The figure is a cross-sectional view of main parts showing the relationship between the liquid supply nozzle and the tank. 1 is a pump, 3 is a flow meter, 4 is an operating valve, 5 is a solenoid valve, 6 is a liquid supply pipe, 7 is a tank, 10 is a nozzle body, 13 is a conical slope, 20 is a nozzle ring,
21 is a window, 22 is a bottomed guide, 30 is a guide case, 32 is a bottomed pipe, 40 is a first float switch, 41 is a second float switch, 42 is a first
Float, 43 is a second float, 50 is a guide pipe, 51 is a piston, 52 is a packing, 53 is an air hole, 60 is a pipe plug, 61 is a cover, 62 is an air pipe, 63 is a hose fitting, 65 is a cable, 66 is a Stoppa, 70 is the first judgment pipe, 7
1 is the second judgment pipe.

Claims (1)

[Claims] 1. In the liquid supply nozzle attached to the tip of the liquid supply pipe 6, a nozzle body 10 is connected to the tip of the liquid supply pipe 6 via a hose fitting 11, and air is placed on the center line of the nozzle body 10. A guide pipe 50 having a passage for guiding air supplied from a source via a solenoid valve 5 is inserted, and the rear end of the guide pipe 50 is fixed to a pipe stopper 60 fixed to the rear part of the nozzle body 10. A guide case 30 is fixed to the bottomed guide 22 fixed to the tip of the guide pipe 50, and includes a built-in liquid level detection means that outputs a signal in response to a change in liquid level due to contact with liquid, and covers the guide case 30. A lead wire 67 for guiding the signal from the liquid level detection means to the outside is inserted into the pipe 50, and an air hole 53 is formed at the tip of the guide pipe 50 in a direction perpendicular to the guide pipe 50, and an air source is provided. A nozzle ring 20 is movably fitted into the piston 51 and is fixed to the piston 51 and the nozzle body 10 at the rear of the piston 51.
When air is supplied from the guide pipe 50 to the air chamber A formed between the nozzle ring 20 and the bottomed guide 22 fixed to the nozzle ring 20, it comes into contact with the tip of the nozzle body 10 and closes it. A liquid supply nozzle characterized in that a gasket 52 is fixed, and the piston 51 closes the tip of the nozzle body 10 when air is supplied to the air chamber A according to a signal from the liquid level detection means. 2. A patent characterized in that the tip of the nozzle body, which is inserted into the container, has a conical shape from the rear to the tip, and is fitted with a stopper 66 that is positioned at a predetermined position and can freely adjust the amount of nozzle insertion. A liquid supply nozzle according to claim 1. 3. The liquid level detection means includes a plurality of floats arranged in series and slidable along the bottomed pipe 32, a part of which is fitted at the tip of the guide pipe 50, and built in the bottomed pipe 32. 3. The liquid supply nozzle according to claim 1, wherein the liquid supply nozzle is a float switch comprising a sensor operated by the float and a sensor operated by the float. 4. The liquid supply nozzle according to claim 1 or 2, wherein the liquid level detection means is a plurality of determination pipes of different lengths connected to a back pressure detection sensor.