JP3040404B2 - Control valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control valve provided between an inflow pipe and an oil supply pipe of an oil storage tank installed underground in a gas station such as a gas station.

[Prior art] In order to efficiently supply oil from a lorry to a plurality of oil storage tanks installed underground at a gas station, the applicant of the present application has filed Japanese Patent Application No.
No. 261469 (see Japanese Patent No. 2722101) proposes a replenishing device in which an inflow pipe to an oil storage tank is connected to a single lubrication pipe via a control valve that closes each pipe when the tank is full.

Referring to FIG. 5, two islands 61a and 61b are provided in the site 60 of the gas station. Each island has two refuelers 62, 63
And 64, 65 are provided, and each refueling machine has two refueling nozzles 62a, 62b, 63a, 63b, 64a, 64b and
65a and 65b are provided.

On the other hand, in the site 60, three, for example, regular gasoline oil storage tanks 66a, 66b, 66c, two, for example, high-octane gasoline oil storage tanks 67a, 67b, and one, for example, light oil storage tank 68 are provided.

Each of the inflow pipes of the oil storage tanks 66a, 66b, and 66c is connected to one lubrication pipe 3A via a control valve, and similarly, the oil storage tanks 67a and 67b are also connected to one lubrication pipe 3B.
Is connected to a single lubrication pipe 3C. Each of these oil storage tanks is connected to a pipe of an oil supply hose of an oil supply machine as shown in the figure, and is connected to air vents 4a to 4f.
Further, a plurality of tank trucks (for example, 3
) Outlets are connected simultaneously.
a, 69b and 69c are provided.

The control valve is provided with a valve-opening / locking mechanism provided with a diaphragm and operated by negative pressure to release the valve-opening / locking state of the valve body. The sensor tube for transmitting the negative pressure communicates the negative pressure generating portion at the outlet of the valve with the diaphragm chamber, is inserted into the oil storage tank via an air vent, and is opened to the full tank liquid level position. The negative pressure generated in the negative pressure generating part by the flow of the oil sucks the air in the oil storage tank, but when the tank is full and the opening is closed with the liquid level, the air in the diaphragm chamber is sucked to open the valve. The open lock is released, the valve is closed, and lubrication is stopped.

However, the oil storage tank has only one injection pipe and one air vent.
The inflow pipe and the air vent are not necessarily provided in one manhole cylinder, and may be provided in separate manhole cylinders. In this case, it is necessary to drill the insertion hole of the sensor tube in the oil storage tank, but it is dangerous because oil is stored,
Cannot be drilled.

As another known technique, Japanese Patent Application Laid-Open No. 55-79300 discloses a safety device for a liquid supply device having a main valve. However, such a known technique relates to a tank truck and cannot be applied to an underground tank.

Japanese Patent Application Laid-Open No. 62-94596 discloses a technique in which when a negative pressure is generated in a diaphragm, an alarm pin is disengaged and a valve is closed. However, such known techniques are inconvenient when the inflow pipe and the air vent are provided in separate manhole cylinders as described above.

[Problems to be Solved by the Invention] It is an object of the present invention to provide a control valve that can be applied to an oil storage tank in which an inflow pipe and an air vent are provided in separate manhole cylinders.

[Means for Solving the Problems] According to the present invention, a housing having an inflow port on a side surface and an outflow port on a lower surface is provided, an oil supply pipe is connected to the inflow port, and an oil storage tank is connected to the outflow port. In the control valve to which the inflow pipe is inserted, the main valve is kept open, and a locking pin for releasing the locking when the diaphragm chamber becomes positive pressure is attached to the diaphragm chamber and connected to the diaphragm chamber. The sensor pipe is opened in the lubrication pipe, and a float valve is provided at the tip of the sensor pipe, which is closed by its own weight and opened by the buoyancy of the liquid.

[Operation] In the control valve configured as described above, in the initial lubrication,
That is, until the inside of the inflow pipe is filled with oil, the air in the inflow pipe is compressed and becomes a positive pressure, but the float valve closes due to its own weight of the float and the positive pressure releases the valve opening lock. Deter.

Then, when the inside of the inflow pipe is filled with oil, the float valve opens.

When the inside of the inflow pipe is filled and filled with oil, the pressure in the inflow pipe near the oil level in the oil storage tank is positive, and the upper pressure is negative. Therefore, when the oil level in the oil storage tank rises and the pressure near the float valve becomes positive, the positive pressure transmitted through the sensor pipe moves through the diaphragm, and the locking pin locks the locking groove of the valve shaft. Release and close the main valve to stop lubrication.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, for example, an inflow pipe 2 extending to near the bottom is attached to an oil storage tank 66a, and the inflow pipe 2 constitutes one lubrication pipe 3A via a control valve indicated by reference numeral 10 as a whole. Lubrication pipes 3a and 3b are connected. The control valve 10 is housed in the manhole cylinder 5, and a lid 6 is provided at an opening of the manhole cylinder 5.

The housing 11 of the control valve 10 has an inlet 12, an outlet
13 are formed. The inflow pipe 2 is connected to the outflow port 13, the lubrication pipes 3 a and 3 b are connected to the inflow port 12, and a housing 19 for housing the valve opening locking mechanism A is provided on the housing 11. Further, a valve seat 14 is formed at an edge of the outlet 13.

A main valve 17 urged in a valve closing direction by a spring 16 is stored opposite the valve seat 14. The valve shaft 18 of the main valve 17 is
Groove 19a carved in operating section housing 19 via pin 15
The housing is locked in the rotation direction by the
Knob penetrating 19 and mounted on top of housing 19
Projected into 20. A spring 28 for urging the knob 20 downward is interposed between the knob 20 and the sleeve 21 fixed to the housing 19, and the knob 20 has a valve shaft 18
A flange portion 20a is formed which engages with the flange portion 18a at the upper end of the valve shaft and raises the valve shaft 18 against the spring 16.

On the other hand, a chamber 22 is formed in the housing 19, and the chamber 22 is defined by a diaphragm 23 into two right and left chambers 22a and 22b. A piece 24 is provided on the right chamber 22b side of the diaphragm 23.
A locking pin 25 is provided through the valve shaft 18, and a locking groove 18b that is locked to the locking pin 25 when the main valve 17 is in the open position is engraved on the valve shaft 18, and these members 23 to 25 and A valve opening locking mechanism A is constituted by 18b.

Further, a spring 26 for urging the locking pin 25 toward the locking side is interposed in the left chamber 22a, and is communicated with the atmosphere through a communication hole 22c.

On the other hand, a sensor tube 27 communicating with the right chamber 22b is provided. The sensor tube 27 is suspended from the inside of the housing 11 into the inflow tube 2, and a float valve indicated by reference numeral 30 is provided at the lower end thereof. Is provided. The float valve 30 is provided at a position about 10 cm above the oil level when the tank is full, as described later.

In FIG. 2, a main body 31 of the float valve 30 is provided with a sensor tube 27.
And a lower plate 33 having a small hole 33a formed therein.
A float 34 is defined by the body 34 having the small holes 34a formed by connecting the two plates 32 and 33, and the float 35 has
The float 36 is accommodated with a gap provided between the inner peripheral wall and the inner peripheral wall. Also,
A valve element 3 facing the valve seat 32a of the upper plate 32 is provided above the float chamber 35.
7 is provided, and a lower end of the valve body 37 is provided with a triangular link plate 39 pivotally connected to a lower portion of the upper plate 32 via a pin 38.
It is pivotally attached to the inner end. One end of a link 40 is pivotally attached to the outer end of the link plate 39, and the other end of the link 40 is pivotally attached to the upper end of the float 36. Therefore, the valve element 37 opens and closes by the vertical movement of the float 36.

In the control valve 10, the knob 20 is normally pulled up against the spring 28, the valve shaft 18 is pulled up against the spring 16 via the flange portions 20a and 18a, and the locking groove 18b of the valve shaft 18 is moved to the diaphragm. Lock the main valve 17 with the lock pin 25 of the 23
Leave as shown in the figure.

At the time of lubrication, connect the lorry lubrication hose to the lubrication pipe 3A, open the lorry main valve and lubricate the oil.
Oil storage tank 66a from inflow pipe 2 via inflow port 12 and outflow port 13
To the other oil storage tank 66 via the lubrication pipe 3b.
Also flows to b and 66c. At this time, the air in the inflow pipe 2 is compressed to a positive pressure until the inside of the inflow pipe 2 is filled with the oil after the oil starts flowing. At this time, the float valve 30 is in the state shown in FIG. 2, the valve body 37 is seated on the valve seat 32a, the open end of the sensor tube 27 is closed, and the positive pressure is applied through the sensor tube 27 to the right chamber 22b.
Is prevented from being applied to the

After the lubrication is started, after a while, the inside of the inflow pipe 2 is filled with oil, the inside of the float chamber 35 is also filled with oil, and the float 36 floats,
The valve body 37 is lowered and the open end of the sensor tube 27 is opened as shown in FIG. However, in this state, the inflow pipe pressure near the oil level in the oil storage tank is converted to a pressure head by the speed head and becomes a positive pressure, but the inflow pipe pressure in the upper portion is a negative pressure. Therefore, the right chamber 22b is not applied. The position of the conversion point where the positive pressure is converted to the negative pressure varies depending on the pipe diameter, flow oil type, etc.
10cm above.

Then, as the lubrication proceeds and the oil level in the oil storage tank 66a rises and reaches a position about 10 cm below the float valve 30, the float chamber 35
When the internal pressure changes from negative pressure to positive pressure and the oil level rises, the inside of the float chamber 35 becomes sufficiently positive. As a result, the positive pressure acts on the right chamber 22b via the sensor tube 27, and displaces the diaphragm 23 to the left against the spring 26, as shown in FIG. To release the locking of the locking groove 18b. Therefore, the main valve 17 is urged by the spring 16 to
And lubrication stops. At this time, since the left chamber 22a communicates with the atmosphere by the communication hole 22c, the diaphragm 2
The operation of 3 is assured.

[Effects of the Invention] The present invention can be applied to a control valve of an oil supply pipe of an oil storage tank provided with a float valve at an opening end of a sensor pipe hanging down in an injection pipe and having only an inflow pipe in a manhole cylinder.

In addition, a plurality of oil storage tanks may be connected to the lubrication pipe, and a plurality of couplings connected to the plurality of outlets of the lorry may be provided in the lubrication pipe to improve the lubrication efficiency. it can.

[Brief description of the drawings]

1 and 3 are side sectional views showing an embodiment of the present invention at the time of valve opening and valve closing, and FIGS. 2 and 4 are FIGS. 1 and 4 respectively.
FIG. 5 is a plan view of a gas station having a replenishing device for a plurality of oil storage tanks. A: Valve opening locking mechanism, 2: Inflow pipe, 3A: Lubrication pipe, 10
…… Control valve, 27 …… Sensor tube, 30 …… Float valve

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-55-79300 (JP, A) JP-A-62-94596 (JP, A) JP-A-2-83300 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B67D 5/60

Claims (1)

(57) [Claims] A housing having an inflow port on a side surface and an outflow port on a lower surface, an oil supply pipe connected to the inflow port, and an inflow pipe inserted into the oil storage tank connected to the outflow port. In some control valves, a lock pin that holds the main valve open and releases the lock when the diaphragm chamber becomes positive pressure is attached to the diaphragm chamber, and a sensor pipe connected to the diaphragm chamber opens into the lubrication pipe. A control valve, characterized in that a float valve is provided at the tip of the sensor tube, which is closed by the weight of the float and opened by the buoyancy of the liquid.