JP3879806B2 - Overflow prevention valve for lorry - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve device for preventing overflow when unloading from a lorry to an oil storage tank.
[0002]
[Prior art]
The oil storage tank is equipped with an overflow prevention valve that can be remotely operated at the refueling port that receives fuel oil etc. from the lorry, and when the amount of liquid exceeds the specified amount due to a signal from the level gauge during lubrication from the lorry Is configured to close the overflow valve.
[0003]
[Problems to be solved by the invention]
For this reason, there is a problem that the structure of the oil storage tank becomes complicated because an overflow valve is required for each oil storage tank. In order to solve such a problem, a lorry discharge port provided with a stop valve that is closed by a liquid level signal of an oil storage tank has been put into practical use.
According to this, although the overflow prevention valve on the side of the filling station is not required and the equipment cost of the filling station can be reduced, there is a problem that it is not possible to supply oil by a lorry that does not include such an overflow prevention valve.
The present invention has been made in view of such problems, and the object of the present invention is to prevent the oil storage tank from overflowing by attaching it to a lorry when the oil storage tank is not equipped with an overflow prevention valve. It is to provide a detachable overflow prevention valve that can be used.
[0004]
[Means for Solving the Problems]
In order to solve such a problem, in the present invention, an inflow port that can be attached to and detached from a discharge port of a lorry, an outflow port to which an oiling hose is connected , and a flow path that connects the inflow port and the outflow port. provided, the locked butterfly valve in an open state by the locking member in a state of being urged in the valve closing direction by the biasing means, the upper limit signal from the liquid level gauge oil storage tank which receives lubrication by the lorry On the basis of this, it is composed of release means for releasing the locking by the locking member by air supplied from the outside .
[0005]
[Action]
Normally, the valve is kept open and lubrication is possible.However, when the liquid level of the oil storage tank exceeds the upper limit, air is supplied to the release means, so the butterfly valve is driven by the accumulated force of the urging means. Closed to prevent overflow.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Therefore, details of the present invention will be described below based on the illustrated embodiment.
FIG. 1 shows an oil supply state to an oil storage tank by a lorry equipped with an overflow prevention valve according to the present invention. An oil storage tank 1 buried underground has a liquid level gauge 2 for detecting the liquid level. An oiling pipe 4 provided with a connection port 3 installed on the ground is communicated.
[0007]
In the lorry 5, the tank 6 is divided into a plurality of hatches 8 by walls 7, and the bottom surface of each hatch 8 is communicated with a discharge pipe 10 through a bottom valve 9. Each bottom valve 9 is configured to be openable by a bottom valve operation handle 13 whose lock mechanism 12 is released by a signal from a control device 11 described later.
[0008]
The control device 11 includes a keyboard 14 and a display panel 15, and outputs a valve opening signal to an electromagnetic valve 17 that connects the air source 16 and the lock mechanism 12 by operating the keyboard 14, and the liquid installed in the oil storage tank 1. In response to a signal from the face meter 2, an electromagnetic valve 19 that supplies air from an air source 16 to an overflow prevention valve 30 described later via a tube 18 is opened and closed. In addition, the code | symbol 20 in a figure shows the discharge valve provided in the vicinity of the discharge port 22 with the oil supply hose 21. FIG.
[0009]
FIG. 2 shows an embodiment of the above-described detachable overflow prevention valve 30, in which a connection port 33 with a lorry is provided at one opening 32 a of a valve body 32 having a butterfly valve 31, and at the other end. A connection port 34 to the lubrication hose 21 is fixed to the opening 32b, and an operation box 35 is provided on the upper part of the valve body 32. In the drawing, reference numerals 33a and 34a denote a fixing lever and a fixing groove, respectively.
[0010]
The valve main body 32 is configured such that one end 36a of an operating rod 36 connected thereto is exposed at the upper end of the operation box 35 and can be set in a valve open state by a detachable operation handle 37. The operating rod 36 is connected to the other end 50b of the spiral spring 50 whose one end 50a is fixed to the base 38 of the operation box 35 via the connecting member 39 so as to rotate the butterfly valve 31 in the valve closing direction. It is energized.
[0011]
An arm 41 that is locked to one end of the lever 40 in a valve open state is fixed to the operating rod 36, and the other end of the lever 40 is connected to an air cylinder 42 that receives supply of air from the air tube 18 described above. Has been. In the figure, reference numeral 43 denotes an upper lid that is liquid-tightly fixed to the base 38, and reference numeral 44 denotes a connection tool to the air tube 18.
[0012]
Next, the operation of the lorry equipped with the overflow prevention valve 30 configured as described above will be described based on the flowchart shown in FIG.
When the oil storage tank 1 of the filling station is not equipped with an overflow prevention valve, it is confirmed by the display on the upper surface of the operation box 35 that the butterfly valve 31 is set in the open state, and the connection port 33 is connected to the lorry 5 Attach the lubrication hose 21 to the discharge port 22 by the fixing lever 33a in the same manner as the connection and fixation (step A). When the butterfly valve 31 is in the closed state, when the operation handle 37 is attached to the operating rod 36 and rotated in the valve opening direction, one end of the lever 40 is moved as shown in FIG. It is locked by the arm 41 and set to the valve open state. After setting, the operation handle 37 is removed.
[0013]
When the keyboard 14 of the control device 11 instructs that the fuel supply is performed with the overflow prevention valve 30 attached, the control device 11 determines the presence or absence of a signal from the liquid level gauge 2 (step B). When a liquid level signal is input to the control device 11, a predetermined hatch can be designated from the keyboard 14. When one hatch 8 is designated by the keyboard 14, the control device 11 outputs a valve opening signal to the electromagnetic valve 17 to release the lock mechanism 12. As a result, the bottom valve 9 can be opened (step C).
[0014]
On the other hand, if the liquid level signal is not input, an alarm is issued (step D), the subsequent operation is stopped, and after a predetermined time has elapsed (step e), the presence / absence of the liquid level signal is again confirmed ( Step b). When the level gauge 2 and the control device 11 are connected by the cable 45 by this alarm, the bottom valve 9 of the hatch 8 can be opened as described above.
[0015]
Next, the respective connection ports of the lubrication hose 21 are connected to the connection port 34 of the overflow prevention valve 30 and the connection port 3 of the lubrication pipe 4, and after opening the bottom valve 9, the discharge valve 20 is opened and hatched. From 8 the oil storage tank 1 is started to lubricate. During the lubrication period, the liquid level in the oil storage tank 1 is detected by the liquid level gauge 2 and a liquid level signal is input to the control device 11.
[0016]
In this way, when all of the fuel oil in the hatch 8 has been discharged to the oil storage tank 1 (step), the bottom valve 9 and the discharge valve 20 are closed and oil is injected into the next oil storage tank. When the upper level signal is not output from the level gauge 2 and the fuel oil in the hatch 8 is not completely discharged even after a predetermined time has elapsed (step H), the overflow prevention valve 30 is closed. Therefore, an error is displayed on the display panel 15 to prompt confirmation (stepping).
[0017]
On the other hand, when the fuel oil in the oil storage tank 1 exceeds the upper limit level during unloading, the upper limit signal is output from the liquid level gauge 2 (step F), so the control device 11 outputs a valve opening signal to the electromagnetic valve 19 (step F N), the air from the air source 19 is supplied to the overflow prevention valve 30.
[0018]
As a result, the air cylinder 42 of the overflow prevention valve 30 is actuated to rotate the lever 40 as shown in FIG. The arm 41 that has lost its support rotates in the valve closing direction by the accumulated force of the spiral spring 37 to close the butterfly valve 31 and simultaneously issues an alarm (steple). As a result, the flow of fuel oil from the hatch 8 to the oil storage tank 1 is blocked, and overflow is prevented. Thus, since the valve closing operation is based on the pressure of air and the accumulated force of the spiral spring 37, a high-speed operation is possible without any risk of ignition.
[0019]
At the stage where the butterfly valve 31 is closed, the control device 11 outputs a valve closing signal to the electromagnetic valve 19 to stop the supply of air to the overflow prevention valve 30 (step A).
[0020]
Thereafter, the discharge valve 20 and the bottom valve 9 of the hatch are closed to cut off the flow path between the hatch 8 and the discharge port 22, and then the oil supply hose 21 and the overflow prevention valve 30 are removed.
[0021]
Needless to say, when oiling into an oil storage tank equipped with an overflow prevention valve, it is possible to lubricate without overflowing in either the state with or without the overflow valve installed. Absent.
[0022]
Moreover, in the above-mentioned embodiment, the oiling hose is configured to be detachable. However, it is obvious that the same effect can be obtained even if the oiling hose is fixed to one end.
[0023]
Further, in the above-described embodiment, the air for closing the valve is supplied from the control device of the lorry to the overflow prevention valve. However, it is obvious that the same effect can be obtained even if the equipment of the filling station is used.
[0024]
【The invention's effect】
As described above, according to the present invention, as described, can also be lubricated without causing overflow against oil storage tank is no facility overflows valve, also even in Lori having a plurality of discharge ports It can be selectively attached to the discharge port for unloading, and the cost of the lorry can be reduced as compared with the case where an overflow prevention valve is provided at each discharge port.
[Brief description of the drawings]
FIG. 1 is a view showing a state of oil injection to an oil storage tank by a lorry equipped with an overflow prevention valve of the present invention.
FIG. 2 is a perspective view showing an embodiment of the overflow prevention valve.
FIG. 3 is a partial cross-sectional view showing an embodiment of the operation unit of the overflow prevention valve according to the embodiment with a cross-sectional structure parallel to the flow direction.
FIG. 4 is a partial cross-sectional view showing an embodiment of an operation unit of the overflow prevention valve according to the embodiment with a cross-sectional structure perpendicular to the flow direction.
FIG. 5 is a view showing an embodiment of a spring for closing the overflow prevention valve.
FIGS. 6A and 6B are diagrams showing the position of the lever when the overflow prevention valve is in the closed state and the open state, respectively.
FIG. 7 is a flowchart showing the operation of the apparatus.
[Explanation of symbols]
1 Oil storage tank 1
2 Level gauge 3 Connection port 4 Lubrication pipe 5 Roller 8 Hatch 12 Lock mechanism 13 Bottom valve operation handle 11 Control device 16 Air source 17, 19 Solenoid valve 18 Tube 30 Overflow prevention valve 31 Butterfly valve 35 Operation box 36 Actuation rod 40 Lever 41 arm 50 spiral spring

Claims (1)

An inlet that can be attached to and detached from the outlet of the lorry, an outlet to which an oiling hose is connected, and a channel that connects the inlet and the outlet, and is biased in the valve closing direction by a biasing means. The butterfly valve that is locked in the open state by the locking member and the locking member by air supplied from the outside based on the upper limit signal from the liquid level gauge of the oil storage tank that receives oil by the lorry An overflow prevention valve for a lorry comprising release means for releasing the lock.

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