JPH0411998Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a load spill prevention device for a safety valve in a tank lorry.

More specifically, the present invention relates to a safety valve cargo leakage prevention device for preventing the cargo from flowing out of the safety valve even if the safety valve is damaged due to an overturning accident of a tank lorry.

``Prior art'' and ``Problems to be solved by the invention'' For example, in tank trucks that transport hazardous materials such as gasoline, kerosene, and light oil, tanks in each tank chamber are used to maintain approximately constant pressure within the tank chamber. A safety valve is provided in a manner that projects from a manhole cover of a manhole provided on the top surface or the top surface of each tank chamber. Therefore, for example, if the tank truck falls over and the safety valve is damaged, dangerous substances such as gasoline will flow out onto the road, potentially leading to a catastrophe.

Therefore, there has been a demand for the development of a cargo leakage prevention device that can prevent dangerous substances such as gasoline from flowing out onto the road even if the safety valve is damaged due to an overturning accident of the tanker truck.

"Means for Solving the Problems" In view of the above-mentioned circumstances, the present invention has been made to solve the above-mentioned conventional problems. The inside of the main body is connected to the lower end of the opening of the main body of the safety valve provided in the manhole cover, and is configured by providing a blocking part on the upper inner peripheral surface of the cylindrical cover member and a support member on the lower end of the opening. A spherical float valve is disposed so as to be movable between the blocking portion and the support member, and a plurality of inflow ports are formed in the circumferential direction of the lower peripheral wall of the cover member of the main body portion, thereby preventing the outflow of loaded objects. The system is equipped with a device.

The blocking portion has an upwardly inclined shape with a small diameter. Further, a guide protrusion is provided on the inner peripheral surface of the cover member of the main body, and the guide protrusion extends over the entire length from the blocking part to the lower end of the cover member, and extends from the small diameter part of the blocking part. Three or more of them are provided at appropriate intervals to form a large-diameter inscribed circle. Further, an appropriate number of communication holes are bored in the support member. Further, the spherical float valve is
It is formed to have a slightly smaller diameter than the inscribed circle of the guide protrusion and a larger diameter than the small diameter portion of the blocking portion.

"Operation" Since the present invention consists of the above means, it operates as follows.

That is, for example, when a tank truck is tilted at a predetermined angle or more, the liquid level of a dangerous substance such as gasoline loaded in the tank chamber changes, and an inlet or an inlet is caused to flow into the main body of the load spill prevention device that is provided to protrude into the tank chamber. When a dangerous substance flows in from a communication hole, etc., the spherical float valve, which is always located on the support member supported by the support member, moves toward the blocking part as the dangerous substance flows in. Move and close the blockage. Since the spherical float valve that has closed the blocking portion is pressed against the blocking portion by water pressure, the blocking portion is closed in a watertight manner. Therefore, even if the safety valve is damaged due to an accident such as a fall of the tank truck, the damaged dangerous substances such as gasoline will not flow out onto the road.

In addition, in the event of a tank lorry overturning accident, dangerous substances may suddenly flow into the main body from some of the inlets on one side, causing the spherical float valve to be forced toward the peripheral wall or support member on the opposite side of the cover member. It is conceivable that this may cause pressure and prevent movement toward the blocking portion. However, in such a case, in this load spill prevention device, there is a gap between the spherical float valve and the peripheral wall on the opposite side of the cover member due to the guide protrusion, and there is also a gap between the peripheral wall on the opposite side of the cover member. Since the inlet is provided and the supporting member is also provided with an appropriate number of communication holes, the spherical float valve, which was temporarily blocked from moving, can be quickly removed by dangerous substances flowing in from these ports. Move toward the blocking part and close the blocking part. In this way, the above-mentioned prevention of outflow of dangerous substances can be more accurately achieved.

"Embodiment" The present invention will be described below based on an embodiment shown in the drawings.

In Figures 1 to 3, 1 is a tank truck, 2 is a tank of tank truck 1, and this tank 2 is partitioned into a plurality of tank chambers 4, 4... by partition plates 3, 3... In addition, a manhole 6 having a loading port 5 for loading dangerous substances such as gasoline into each tank chamber 4, 4... is provided on the upper surface of each tank chamber 4, 4... There is. 7 is a safety valve provided on the manhole cover 8 of the manhole 6, and this safety valve 7 is constructed as follows. That is, 10 is a cylindrical safety valve body, and this safety valve body 10 is provided with its lower end opening into the tank chamber 4 via a boss 9 fixed to a mounting hole formed in the manhole cover 8.

11 is a valve body provided in the safety valve body 10, and this valve body 11 is connected to the valve body 11 and the safety valve body 10.
The safety valve 7 is always in contact with the valve seat 14 by the biasing force of a spring 13 interposed between spring retainers 12 which are adjustable at the upper end, thereby closing the safety valve 7. Reference numeral 15 denotes a lid capped on the upper part of the safety valve body 10, and 16 denotes a lid body that covers the safety valve body 1.
A plurality of air outlets are formed in the peripheral wall above the valve seat 14 at 0. Therefore, when gas is generated in the tank chamber 4 and the pressure in the tank chamber 4 rises above a predetermined pressure, the valve body 11 resists the urging force of the spring 13 and moves to the position shown by the imaginary line in FIG. lifted up,
Since the gas is discharged from the outlet 16 through this gap, the pressure inside the tank chamber 4 decreases. When the pressure inside the tank chamber 4 falls below a predetermined pressure, the valve body 11 is lowered by the biasing force of the spring 13.
Since the safety valve 7 is closed by contacting the valve seat 14, the inside of the tank chamber 4 is always kept at a substantially predetermined pressure due to the action of the safety valve 7. In addition, 17 is a flange 18 provided on the outer periphery of the safety valve main valve 10.
This is Patsukin interposed between Boss 9 and Boss 9.

Reference numeral 20 denotes a loaded material leakage prevention device that is connected to the lower end of the safety valve 7 and protrudes into the tank chamber 4. This loaded material leakage prevention device 20 is constructed as follows. That is, 21 is the main body of the loaded material spill prevention device 20, and this main body 21
has a mounting step part 24 having a threaded part 23 screwed into the boss 9 on the outer periphery of the upper end, and a blocking part 25 with a small diameter inclined upwardly is formed on the inner peripheral surface of the upper part. , to form an inscribed circle that is larger in diameter than the small diameter part of the blocking part 25 and smaller in diameter than the large diameter part over the entire length of the blocking part 25 from the middle to the lower end. A plurality (three in the embodiment) of guide protrusions 26 are provided at equal intervals, and an appropriate number of circular inflow ports 27 are provided at approximately equal intervals along the circumferential direction as shown in the lower peripheral wall. A cylindrical cover member 2 having a predetermined length formed by perforating 27...
2, guide protrusions 26, 26...A male threaded portion 31 is provided on the outer periphery to be screwed into a female threaded portion 29 provided at the lower end, and an appropriate number of communication holes 32, 32...
The main body part 21 is connected to the lower end of the safety valve 7 by screwing the threaded part 23 of the cover member 22 onto the boss 9 and attaching it to the tank chamber 4. It is configured to maintain a positional relationship in which the liquid level L of a dangerous substance such as gasoline loaded in a predetermined amount in a normal state substantially coincides with the lower end thereof. 33 is a spherical float valve disposed within the main body 21, and this spherical float valve 33
has a diameter slightly smaller than the inscribed circle of the guide protrusion 26 and larger than the small diameter part of the blocking part 25, and is configured to be able to move freely between the blocking part 25 and the support member 30. There is.

Note that 34 is a gap formed between the cover member 22 and the support member 30, and 35 is a packing interposed between the mounting step 24 and the boss 9.

Since the present invention has the above configuration, when the liquid level L of a dangerous substance such as gasoline changes and the load spill prevention device 20 is immersed below the liquid level L of the dangerous substance, the inlet 27, the communication hole The spherical float valve 33, which is normally located on the support member 30, is blocked by dangerous substances that flow into the main body 21 from the 32 and the gap 34, and flow into the safety valve 7 side from the upper end opening. It is moved in the direction of the stopper 25 and comes into contact with the stopper 25, as shown by the imaginary line in FIG. Blocking part 25
The spherical float valve 33 that is in contact with the blocking portion 25 is pressed against the blocking portion 25 by the water pressure of the dangerous substance.
will be closed watertight.

Therefore, even if, for example, the tank truck 1 causes an accident and the safety valve 7 protruding from the tank 2 is damaged, dangerous substances such as gasoline will not flow out of the tank 2.

In addition, since the spherical float valve 33 is normally located on the support member 30, when the pressure inside the tank chamber 4 increases, the gas generated inside the tank chamber 4 flows through the inlet port 27, Since the valve body 11 is lifted up through the communication hole 32 and the like and the air is blown out from the air outlet 16, the function of the safety valve 7 is not impaired in any way.

In addition, since three guide protrusions 26 are provided at equal intervals along the entire length from the middle of the blocking portion 25 to the lower end of the cover member 22, for example, a sudden drop from a part of the inlet 27, etc. Dangerous materials flow into the main body 21, and the dangerous materials flow into the spherical float valve 33.
The spherical float valve 33 acts to apply pressure in the direction of the opposite peripheral wall of the cover member 22 or the support member 30, and even if the spherical float valve 33 is temporarily prevented from moving toward the blocking portion 25, the spherical float valve 33 and A guide protrusion 26 is provided between the peripheral wall on the opposite side of the cover member 22.
A gap exists between the support member 30 and the cover member 22, and an inlet 27 is also formed in the peripheral wall on the opposite side of the cover member 22. A communication hole 32 is formed in the support member 30, and a gap exists between the support member 30 and the cover member 22. Since the gap 34 is formed in the inlet 27, the communication hole 32, and the gap 34, the spherical float valve 33, which was temporarily blocked from moving, is extremely The normal state is quickly released and the blockage part 25 is moved toward the blockage part 25.
will be closed.

Therefore, the hazardous materials are removed from the load spill prevention device 20.
If the safety valve 7 is damaged due to an overturning accident of the tank lorry 1, the movement of the spherical float valve 33 is hardly restricted by the direction of the inflow. It is possible to prevent the outflow of hazardous materials.

In addition, in the above-mentioned embodiment, the cover member 2
An appropriate number of circular inlets 27, 27 are provided on the lower peripheral wall of 2.
... has been described, but the structure of the inlet is not limited to the embodiment. For example, as shown in FIG. The configuration may be such that the inlet 27a is cut out to form a rectangular inlet 27a.

"Effects of the Invention" As described in detail above, according to the load spill prevention device of the safety valve in the tank lorry according to the present invention, the liquid level of the load loaded in the tank chamber changes, and the tank lorry is connected to the safety valve. When a loaded object flows into a loaded object spill prevention device protruding into the room, the spherical float valve installed inside the loaded object spill prevention device moves as the loaded object flows in, preventing the loaded object from flowing out. In order to close the blocking portion of the leak prevention device, communication between the safety valve and the inside of the tank chamber is cut off. Furthermore, even if a loaded object suddenly flows in from a part of the inlet on one side due to an overturning of the tank lorry, etc., the blocking portion can be quickly and accurately closed by the spherical float valve. Therefore, even if the tank truck falls over and the safety valve is damaged, the loaded items will not spill out onto the road, etc., thus preventing accidents that may occur due to loaded items spilling out onto the road, etc. Its effects are remarkable and significant, such as making it possible to

[Brief explanation of the drawing]

Fig. 1 is a plan view of a tank truck, Figs. 2 and 3 show an embodiment of the present invention, Fig. 2 is a vertical sectional view of the main parts, Fig. 3 is a bottom view, and Fig. 4 is a plan view of the tank truck. It is a front view which shows another Example of an inflow port. In the figure, 1 is a tank truck, 2 is a tank, 3 is a partition plate, 4 is a tank chamber, 5 is a loading port, 6 is a manhole, 7 is a safety valve, 8 is a manhole cover, 9 is a boss, 10 is the safety valve body, 11 is Valve body, 12 is a spring holder, 13 is a spring, 14 is a valve seat, 1
5 is a lid body, 16 is an air outlet, 17 and 35 are gaskets, 18 is a flange, 20 is a loaded object outflow prevention device, 21 is a main body part, 22 is a cover member, 23 is a screw part, 24 is a mounting step part, 25 is a blocking portion, 26 is a guide protrusion, 27, 27a are inflow ports, 29 is a female threaded portion, 30 is a support member, 31 is a male threaded portion, 32 is a communication hole, 33 is a spherical float valve, 34 is a gap portion, L
is the liquid level.

Claims (1)

[Scope of Claim for Utility Model Registration] Connected to the lower end of the opening of the main body of a safety valve provided on the upper surface of each tank chamber in the tank of a tank truck or on the manhole cover of each tank chamber,
A blocking portion is provided on the upper inner peripheral surface of the cylindrical cover member, and
A spherical float valve is disposed within a main body configured by providing support members at the lower ends of the openings, so as to be movable between the blocking portion and the support members, and a spherical float valve is provided in a circumferential direction of the lower peripheral wall of the cover member of the main body. A load outflow prevention device is provided in which a plurality of inflow ports are formed in the main body, and the blocking portion has an upwardly inclined shape with a small diameter, and a guide is provided on the inner circumferential surface of the cover member of the main body portion. A protrusion is provided, and the guide protrusion extends over the entire length from the blocking portion to the lower end of the cover member, and the guide protrusion is arranged at suitable intervals of 3 to form an inscribed circle with a larger diameter than the small diameter portion of the blocking portion. an appropriate number of communication holes are provided in the support member, and the spherical float valve has a diameter slightly smaller than the inscribed circle of the guide protrusion, and a small diameter portion of the blocking portion. A safety valve cargo spill prevention device for a tank lorry, characterized by having a larger diameter.