JP3373729B2 - Oil mixture prevention mechanism in refueling equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for unloading a connection between a coupling connected to a hose of a tank truck and an oil supply port of an underground tank without mistaking the oil type. The present invention relates to a device for preventing oil mixture. 2. Description of the Related Art The inside of a tank of a tank truck for transporting oil to a gas station or the like is divided into a plurality of chambers, and different types of oil are often loaded in each of the chambers. For example, when regular, high octane, light oil, kerosene, and the like are loaded on a single tank truck, at the gas station, underground tanks and the like are refueled according to their oil types when unloading. If not, it is dangerous. [0004] Conventionally, the means for confirming the unloading is such that the driver of the tank lorry or the staff at the gas station checks the oil type tag provided on the bottom valve valve or the like of the tank lorry with the oil type plate at the gas station. Was going by. [0005] In general, such a method is liable to cause an erroneous recognition of an operator, and the frequency of occurrence of oil mixture is not always low. On the other hand, conventionally, as described in, for example, Japanese Patent Application Laid-Open No. Hei 4-57798, when the connection between the coupling and the oil filler is erroneously made, an alarm buzzer is activated to prevent the oil mixture from occurring. And other measures were taken. However, such equipment requires a controller or the like which electrically or mechanically detects that the connection between the coupling and the fuel filler is abnormal or processes the signal to control the operation of the alarm buzzer. Therefore, not only the facility cost but also the maintenance and inspection tend to be complicated. In addition, if an electric detection means is used, the electric system is attached to a filler port or the like.Therefore, unless the safety factor is sufficiently designed, oil may be ignited by sparks or the like. And end up in a very dangerous situation. In order to solve such a problem, the applicant of the present invention has already proposed and applied for a Japanese Patent Application No. 7-161938, which is a device for preventing oil mixture which is extremely simple and does not require any electric system. This is done by mounting an oil type plate on the oil filler side, keeping the oil type plate along the peripheral wall of the oil filler port during normal operation, and connecting the coupling on the tank truck to the oil filler port. A plate holding ring attached to the ring is engaged with the ring and turned up, so that the display surface is set to a posture facing the operator. If such an oil seed plate is provided,
When the coupling is connected, the oil seed plate always moves to a position that can be visually checked by the operator, which prevents oil mixing and significantly improves safety because no electrical system is used. The plate holding ring provided on the coupling is generally made of iron because of its strength. On the other hand, the oil type plate is struck at the lower end of the plate holding ring every time the coupling is connected, and it is arranged outside and exposed to wind and rain. is necessary. Therefore, it is considered effective to use a metal plate or the like having an appropriate thickness. However, when the oil type plate is made of metal such as iron, there is a high possibility that minute sparks are scattered by an impact when the plate holding ring abuts or that the temperature rises locally locally due to friction. For this reason, especially in the case of unloading of gasoline, the generation of such a spark and the rise in temperature are extremely dangerous, which may affect the safety work. [0011] As described above, in the case where the oil type plate is mounted on the oil filler side so that the oil type plate can be raised, the structure is simple and visual confirmation can be surely performed. Needs to be designed with a large safety coefficient as in the case of providing an electric system, and for example, it is required to take measures such as attaching a new member to an existing fuel filler. In addition, since the plate holding ring abuts against the oil seed plate, the oil seed plate itself and the portion to be attached to the oil supply port are quickly fatigued due to repeated load, and the durability is not sufficient. The problem to be solved in the present invention is that the coupling can be safely connected to the filler port without generating a spark or a rise in temperature, and the durability of the oil type plate and its mounting portion is improved. An object of the present invention is to provide an oil prevention mechanism. According to the present invention, an oil type plate indicating the type of oil stored in the tank is attached to an oil filler fitting communicating with the tank side so that the oil type plate can be turned upside down. An oil-mixing prevention mechanism, wherein when the connection fitting connected to a hose is connected to the oil filler fitting, the connection fitting can be set to a display position by pressing the connection-type fitting against the oil-type plate, The mutually abutting portions of the seed plate and the connection fitting are constituted by a combination of a synthetic resin and / or a non-ignitable metal.
An oil mixing prevention device for a fueling facility, wherein
The direction that the connection direction of the fitting is almost coincident with the outer circumference of the fitting
Attach a stay that can swing in the
Put the oil seed plate on the tip of
It is connected in a rotatable manner, and the stay is
It is characterized by being elastically biased in a direction opposite to the load direction from the connection fitting . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In connection with the operation of connecting a connection fitting to a lubrication fitting, the oil seed plate is raised so as to be in a posture suitable for displaying the oil seed plate. The operator can easily confirm the oil type. In the case where the plate holding ring is extrapolated as a separate body to the connection fitting, for example, if the portion where the plate holding ring abuts on the oil seed plate is made of a combination of a synthetic resin or a non-ignitable metal, the connection fitting is provided. Even if it violently comes into contact with the oil seed plate, it is possible to suppress sparks and local rise in temperature. [0017] Further, when the stay for mounting the oil type plate is elastically urged, the butting by the plate holding ring is buffered, and the load on the oil type plate itself and the mounting portion around the oil type plate is reduced. FIG. 1 is a longitudinal sectional view of an essential part of an oil mixture preventing mechanism according to an embodiment of the present invention, showing a fuel supply fitting and a connection fitting on a tank lorry side. In the figure, a cylindrical oil filler fitting 1 connected to an underground tank (not shown) by an oil filler pipe and arranged on the ground has a stopper flange 1a formed on the outer periphery on the upper end side, and An engaging groove 1b is formed on the entire inner peripheral surface. A coil-shaped packing 1c having a lower end seated thereon and an upper end side as a free end is incorporated in the fuel filler fitting 1, and a pair of brackets 1d protruding at a slight interval in the circumferential direction are further provided on the outer peripheral surface. Has formed. The support shaft 2 is fixed to these brackets 1d so as to be orthogonal to the axis of the fuel filler fitting 1, and a stay 2a is mounted around the support shaft 2 so as to be rotatable in the vertical direction in the figure. This stay 2a is interposed around the support shaft 2 and has a spring 2 whose one end abuts against the peripheral surface of the fuel filler fitting 1.
b is engaged and is urged clockwise around the support shaft 2 in the figure by the spring 2b. Further, a pin 2c is attached to the tip of the stay 2a in parallel with the axis of the support shaft 2, and the oil seed plate 3 is connected to the pin 2c so as to be swingable in the direction of the arrow in the figure. Such an articulated structure is, for example, an oil type plate 3
The pin 2c may be inserted into a hole formed in the rib by projecting a rib on the back side of the oil seed plate. Normally, the lower end of the oil seed plate 3 is oriented downward as shown in FIG. It is assumed that the stay 2a is connected to the stay 2a so as to be held. In the illustrated example, the oil seed plate 3 is composed of a metal base 3a formed including the above-described rib portion and a synthetic resin coating layer 3b covering the entire surface thereof. The pressure receiving part 3c is provided by bending the side slightly inward. As a material of the base 3a, it is preferable to use a non-ignitable metal such as a copper alloy such as aluminum or brass. With such a material, the coating layer 3b is peeled off and the base 3a is exposed. Also, no sparks occur when the metal fittings strike. On the front side of the coating layer 3b, an indication of an oil type for specifying the oil stored in the underground tank connected to the oil filler 1 is provided. This display may be, for example, a character that indicates the type of oil, or at a gas station that has a dedicated system for identifying the type of oil, attach a bar code and read this to read the type of oil. What is necessary is just to be able to confirm. Either way, oil seed plate 3
Can perform its function as long as it can visually confirm the oil type or can inform the operator of the oil type by applying another system. On the other hand, the connection fitting 4 connected to the tip of the hose connected to the tank truck is the same as the attachment / detachment structure for the fuel supply fitting 1 proposed by the present applicant and described in Japanese Utility Model Publication No. 46-35068. A sleeve 4a forming a flow path is fixed coaxially inside the inside, and an annular arm 5 for operation is extrapolated outside the sleeve. The lower surface of the sleeve 4a is formed with a flange 4b, and the lower surface thereof is aligned with the packing 1c of the fuel filler fitting 1 so that the sleeve 4a can be seated. An opening 4c is opened in the peripheral wall of the connection fitting 4 to be connected. In addition, in the example shown in the figure, the hanger opening 4c is provided at one place, but it may be opened at two places facing each other in the radial direction as in the above-mentioned publication. Further, a protrusion 4c is provided outside the sleeve 4a.
In addition to the above, an engaging block 6 that can be moved in the radial direction while being guided by the peripheral surface of the opening is incorporated, and a compression coil spring 7 that urges the engaging block 6 outward is interposed. The engaging block 6 forms a flared taper 6a at a portion protruding outside from the opening 4c, and when the taper 6a is pressed downward by the pressing surface 5a of the arm 5 having a shape substantially aligned with the taper 6a, The engagement block 6 has a configuration capable of moving toward the sleeve 4a. A hook 6b is provided on the outer periphery of the lower end of the engagement block 6 to be engaged with the engagement groove 1b of the fuel filler fitting 1 and locked. The arm 5 is an annular body extrapolated around the connection fitting 4 as described above, and is indicated by an arrow in FIG. 1 through a pin 5b of a bracket 4d provided on the side opposite to the opening 4c. It is rotatable in any direction. By making the tapered pressing surface 5a face the taper 6a of the engagement block 6, if the operation of pushing the arm 5 downward is performed, the engagement block 6 can be moved to the sleeve 4a side. Further, a cylindrical plate pressing ring 8 is coaxially fixed to the lower end of the connection fitting 4. The plate holding ring 8 is arranged so as to be larger than the outer diameter of the filler metal fitting 1 and protrude slightly below the lower end of the connecting fitting 1. The outer diameter of the plate holding ring 8 is set so as to cover just above the pressure receiving portion 3c when the oil type plate 3 is in the posture of FIG. 1 and the pressure receiving portion 3c is obliquely upward. In the above arrangement, when the connection fitting 4 is connected to the fuel filler fitting 1, when the right end side of the arm 5 in FIG. 1 is pushed down by hand, the pressing surface 5a and the taper 6a
, The engagement block 6 moves to the left in the figure. As a result, the hook 6b is set at a position where it does not interfere with the opening edge of the upper end of the fuel filler fitting 1, and the hook 6b sinks in at the same time as the insertion of the sleeve 4a. Then, the lower end of the sleeve 4a abuts against the packing 1c to compress it, and as shown in FIG.
c closely contact each other to seal the flow path from the sleeve 4a to the downstream side. In this state, if you lose the force to push the arm 5,
Due to the restoring force of the coil spring 7, the engagement block 6 moves outwardly through the opening / recess 4 c, and the hook 6 b located at the end in the moving direction fits into the engagement groove 1 b, whereby the oil supply fitting 1 is The connection fitting 4 is connected. In the above connection process, when the connection fitting 4 is inserted, the lower end of the plate holding ring 8 pushes down the pressure receiving portion 4c of the oil seed plate 4, and the oil seed plate 4
Is rotated clockwise around the pin 2c. Since the plate holding ring 8 is located all around the connection fitting 4, the lower end of the plate holding ring 8 is connected to the pressure receiving portion 3 c of the oil seed plate 3 regardless of the orientation of the connection fitting 4.
Can be struck. As a result, as shown in FIG. 2, the position of the oil type plate 3 is changed so that its display surface is horizontal, and the display of the oil type is made easier for the operator to see. Therefore, when the connection operation of the connection fitting 4 is completed, the oil type plate 3 moves to draw the operator's eyes and the surface on which the oil type is displayed takes a posture facing the operator. At the same time, the type of oil is surely confirmed, and it is possible to prevent oil mixture. Here, in order to quickly insert the hook 6b into the engagement groove 1b, insert the hook 6b until the hook at the upper end thereof is slightly lower than the inner wall on the upper end side of the engagement groove 1b. After that, using the restoring force of the packing 1c, the hook 6b and the engaging groove 1b can be connected to each other in the vertical direction as shown in FIG. For such an operation, it is necessary to insert the connection fitting 4 once deeper than the connection level. On the other hand, the stay 2a holding the oil seed plate 3 is urged by the spring 2b in the direction of turning upward, so that when the oil seed plate 3 is The stay 2a rotates counterclockwise in the figure due to the elastic deformation of 2b. Therefore, the level of the oil seed plate 3 itself also decreases as the plate holding ring 8 descends, and a large load is not applied to the oil seed plate 3 and the stay 2a even at the initial stage of connection. When the connection fitting 4 is connected, the stay 2a is returned to the original posture by restoring the spring 2b, and the oil seed plate 3 is maintained in the substantially horizontal posture as shown in FIG. Is possible. Furthermore, since the oil seed plate 3 is provided with the coating layer 3b of synthetic resin, even if the metal plate holding ring 8 strikes, sparks are scattered or friction causes a local rise in temperature. No. Therefore, even in the case of unloading gasoline, safe work is ensured without accidents such as ignition. In the illustrated example, the entire oil type plate 3 is covered with the coating layer 3b. However, the coating layer 3b may be formed only on the upper surface portion of the pressure receiving portion 3c where the lower end portion of the plate holding ring 8 abuts. Of course it is. As another configuration for suppressing such sparks and temperature rise, when the oil seed plate 3 is made of metal, the plate holding ring 8 may be made of a synthetic resin ring having an appropriate thickness. , Plate holding ring 8 in the illustrated example
Can be applied in such a manner that only the lower end of the cover is covered with a cover made of synthetic resin. Even when there is a restriction that both the plate holding ring 8 and the oil seed plate 3 must be made of metal, sparking can be achieved by using a non-ignitable metal such as aluminum or copper alloy. Can be suppressed, and the same function as that of the configuration in the embodiment can be provided. According to the present invention, when the connection fitting of the hose from the tank lorry is connected to the lubrication fitting, the oil seed plate moves so as to be in the upright posture and the display surface thereof is exposed to the operator. The oil type can be easily checked at the same time as the connection operation, and the oil mixture can be reliably prevented.
Then, even if a part of the connection fitting is abutted against the oil seed plate, no spark or the like is generated. Therefore, even when used for gasoline, an accident such as ignition does not occur, and a safe unloading operation is ensured. Further, in a configuration in which the stay holding the oil type plate is elastically displaced in the insertion direction of the connection metal fitting, the connection metal fitting is connected to the oil type plate itself and to a portion attached to the oil filler metal fitting. The impact at the time can be reduced, and the durability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway view showing a lubrication port fitting and a hose-side connection fitting that constitute an oil mixture prevention device of the present invention. FIG. 2 is a cutaway view when a connection fitting is connected to a lubrication fitting. FIG. 3 is a cross-sectional view taken along a line AA of FIG. 2; [Explanation of Signs] 1: Refueling fitting 1b: Engagement groove 1c: Packing 2: Support shaft 2a: Stay 2b: Spring 2c: Pin 3: Oil type plate 3a: Base 3b: Coating layer 3c: Pressure receiving part 4: Connection Metal fitting 4a: Sleeve 4c: Recess 5: Arm 5a: Pressing surface 6: Engagement block 6a: Taper 6b: Hook 7: Coil spring 8: Plate holding ring

Claims (1)

(57) [Claims] [Claim 1] An oil type plate indicating the type of oil stored in the tank is attached to an oil filler fitting communicating with the tank side so that the oil type plate can be turned upside down. An oil-mixing prevention mechanism that enables the oil-type plate to be set in a display position by pressing the connection metal against the oil-type plate when connection of the connected connection metal to the oil filler metal fitting is completed. Oil-mixing prevention equipment in an oil supply facility in which the butting portion of the metal fittings and the connection fitting is formed by a combination of a synthetic resin and / or a non-ignitable metal.
In the arrangement, the outer periphery of the fuel filler metal fitting is substantially
Attaching a stay that can swing in the
Then, place the oil seed plate on the end of the stay
The pivoting direction is almost coincident with the swing direction of
Make the stay elastic in the direction opposite to the load direction from the connection fitting.
A mechanism for preventing oil mixture in the refueling equipment that is energized .