JPH0437119Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention The invention relates to a liquid handling device for loading liquids such as kerosene, gasoline, etc. from a liquid storage section into a tank of a tank truck or a tank wagon, and particularly relates to a liquid handling device for loading liquids such as kerosene, gasoline, etc. The present invention relates to a liquid cargo handling device equipped with means for preventing liquid splash from being generated from a sliding drop pipe inserted into a tank.

(b) Prior art and problems Liquid cargo handling equipment for loading oil, gasoline, etc. onto tank trucks, tank wagons, etc. generally includes a loading arm connected to a liquid storage section and an overflow prevention valve at the swinging tip of this loading arm. It consists of drop pipes and the like connected through a tank, and the drop pipe is inserted into the tank to be supplied with liquid. This kind of known technology is disclosed in, for example, Japanese Utility Model Publication No. 56-36800.

Incidentally, from the viewpoint of pollution prevention and air pollution prevention, recent liquid cargo handling devices are becoming of a type that recovers vapor gas and the like generated during loading without releasing it into the atmosphere.

Figure 4 shows a device that enables the recovery of vapor gas.A vapor seal plug 4 for sealing the hatch is attached to the top of a drop pipe 3 with a sliding pipe 2 that is inserted into the tank 1 from the hatch 1a, and a vapor seal Tank 1 is attached to stopper 4.
A flexible pipe 5 is connected to collect the vapor gas generated inside to a storage tank or the like.

In addition, Fig. 5 shows a device that can prevent overflow during liquid loading, and an overflow prevention valve 7 is attached to the upper end of a drop pipe 3 inserted into the tank 1 via a holder 6. A swinging tip of a loading arm 8 is connected to 7. Note that 9 is a vacuum breaker and 10 is a liquid storage tank.

In the conventional liquid cargo handling device as described above, it is necessary to bring the vapor seal plug 4 or the holder 6 of the overflow prevention valve 7 into close contact with the upper end surface of the loading hatch 1a of the tank 1. Since there are various types of drop pipes, an extendable sliding drop pipe 3 having a sliding pipe 2 is often used as a drop pipe.

When loading a liquid such as gasoline into the tank 1 having a volume of 4 Kl using such a slide type drop pipe 3, it is common to carry out the fixed fixed loading of 2 Kl twice.

In this case, after the first 2Kl loading is completed,
Vacuum breaker 9 provided in loading arm 8 is opened to draw outside air into arm 8, thereby automatically causing the remaining liquid in arm 8 to flow down into tank 1, filling arm 8 with outside air. let After that, when the second loading of 2Kl is started, the air in the arm 8 is pushed out towards the tank 1 side by the liquid being supplied, so that the sliding pipe 2 and the drop pipe 3 are connected as shown in Fig. 6. 〓Air blows up from the gap like an arrow for 4 to 5 seconds, and at the same time, the liquid also turns into droplets and blows up. For this reason, the liquid droplets are discharged from the gap between the drop pipe 3 and the hatch 1a to the outside of the tank 1 together with the air.

Therefore, if these liquid droplets are flammable or toxic, they may not only create a dangerous atmosphere around the tank, but also be dangerous for disaster prevention, and even if they are non-hazardous, loading operations may be prohibited. It is also unfavorable from the viewpoint of hygiene for workers and workability.

(C) Purpose of the invention The present invention was made to solve the conventional problems as described above, and provides a liquid cargo handling device that is safe and has good workability by preventing liquid droplets from being blown up from the sliding drop pipe. The purpose is to

(d) Structure of the invention In order to achieve the above object, the liquid cargo handling device of the invention includes a loading arm connected to a storage tank, and a loading arm connected to the swinging end of the loading arm and placed inside the supplied liquid tank. A drop pipe to be inserted, a sliding pipe fitted to the outer periphery of the drop pipe, and a sliding pipe formed at the upper end of the sliding pipe so as to be separated by a predetermined distance in the axial direction between the sliding pipe and the drop pipe. a plurality of apertures, an annular space formed in the sliding pipe between the plurality of apertures and having an inner diameter larger than the apertures, and a hole bored in the sliding pipe located between each of the apertures. and a hole that communicates with the space.

(e) Effect In the above configuration, the air discharged from the loading arm via the drop pipe is throttled by the throttle formed in the sliding pipe, and is ejected into the annular space formed between the throttles. Pressure is suddenly released. Therefore,
The air is prevented from blowing out upwards with liquid droplets through the fitting gap between the drop pipe and the sliding pipe, and is gently flowed to the side of the sliding pipe through the hole communicating with the annular space. is discharged into the tank.

(f) Embodiment of the invention An embodiment of the invention will be described below with reference to FIGS. 1 to 3.

In FIGS. 1 to 3, the liquid cargo handling device is
The loading arm 8 is connected to the storage tank 10 in the same manner as in FIGS. 4 and 5 above, and the overflow prevention valve 7 is fixed to the swinging tip of the loading arm 8. The upper end of a drop pipe 11 is integrally connected to the lower end of the drop pipe 1 through a holder 6 that engages with the hatch 1a of the tank 1.
1, a sliding pipe 12 having an inner diameter larger than the outer diameter of the drop pipe 1 is disposed on the lower end side of the drop pipe 1.
1 and are slidably fitted in the axial direction.

A pair of upper and lower land portions 13 and 14 that protrude inward are formed on the inner wall of the upper end of the sliding pipe 12 and spaced apart from each other by a predetermined distance in the axial direction. Restrictions 15 and 16 are formed between the peripheral surface and the outer peripheral surface of the drop pipe 11 facing thereto to restrict the flow of fluid, and the sliding pipe 12 located between the land portions 13 and 14 has An annular space 22 having an inner diameter much larger than the apertures 15 and 16 is formed, and the space 22 is formed on its peripheral wall.
A plurality of holes 17 are bored at appropriate intervals in the circumferential direction to communicate the tank 2 with the inside of the tank 1. Further, a step portion 19 is formed on the inner periphery of the opening at the upper end of the sliding pipe 12 and engages with a plurality of protrusions 18 protruding from the upper outer periphery of the drop pipe 11. By engaging with the portion 18, the sliding pipe 12 becomes the drop pipe 1.
Hold it at the top for 1. Furthermore, the step portion 19
Recesses 20 are formed in correspondence with the respective projections 18, and by aligning the recesses 20 with the projections 18, the sliding pipe 12 can be lowered relative to the drop pipe 11. Reference numeral 21 denotes a protrusion provided on the outer periphery of the lower end of the drop pipe 11 in order to maintain the lower end position of the sliding pipe 12 with respect to the drop pipe 11, and this protrusion 21 engages with the land portion 14. Note that in FIG. 1, the same reference numerals as in FIGS. 4 and 5 represent the same parts.

Next, the operation of this embodiment configured as described above will be explained.

When loading liquid such as gasoline into the tank 1 in two parts as described above, insert the sliding drop pipe 11 together with the sliding pipe 12 into the tank 1 from the hatch 1a, and then insert the holder 6 into the tank 1 from the hatch 1a. Place it on the top.

In this state, liquid is supplied from the storage tank 10 into the tank 1 through the loading arm 8, drop pipe 11, and sliding pipe 12. When the liquid level in the tank 1 reaches the first quantitative setting value and the loading is completed, the liquid supply is stopped and the vacuum breaker 9 is activated to lower the loading arm 8. Outside air is introduced into the arm 8, and the remaining liquid in the arm 8 is transferred to the tank 1.
The air flows down into the arm 8, filling the inside of the arm 8 with outside air.

After that, when the second liquid loading is started, the air inside the loading arm 8 is transferred to the drop pipe 11.
When the air is pushed out into the tank 1 side, that is, into the sliding pipe 12 through the land portion 14
The water is squeezed by the aperture 16 and is ejected into the annular space 22 provided between the land portions 13 and 14. At this time, since the annular space 22 between the lands 13 and 14 is communicated with the inside of the tank 1 on the side of the sliding pipe 12, the pressure of the liquid droplets passing through the throttle 16 with the air increases rapidly. Also, by being opened to the land portion 13, the liquid droplets are prevented from moving upward by the aperture 15 formed by the upper land portion 13, and the liquid droplets are prevented from moving upward.
is reduced by colliding with Then, the air with extremely small liquid droplets is transported to the land portions 13 and 14.
It is discharged into the tank 1 through the hole 17 between them.

Therefore, when the air in the arm 8 is pushed out, liquid droplets caused by this are prevented from blowing upward, that is, toward the hatch 1a. This prevents liquid droplets from flowing out of the tank during liquid loading, resulting in safety and improved liquid loading workability.

Note that the number of apertures formed by the land portions is not limited to that in the embodiment, and may be greater than that.

(g) Effects of the invention As explained above, according to the invention, a plurality of orifices are provided at the bottom part between the drop pipe and the sliding pipe fitted on the outer periphery of the drop pipe and separated by a desired distance in the longitudinal direction of the pipe. An annular space is formed at the upper end of the pipe and has an inner diameter larger than the apertures between the plurality of apertures, and a side wall of the sliding pipe is formed between the apertures. Since a hole communicating with the space is formed in the loading arm, when the air in the loading arm is pushed out, the pressure of the air containing liquid is suddenly released by the annular space between the throttles, and then the sliding pipe is pushed out. It is gradually discharged into the tank through a hole that communicates with the annular space towards the side, thereby reliably preventing liquid droplets from blowing up, and thereby preventing liquid droplets from flowing out of the tank. Therefore, it is safe and sanitary, requires no maintenance, and improves the workability of the liquid cargo handling equipment.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an example of the liquid cargo handling device of the present invention, Fig. 2 is an enlarged sectional view of the part shown in Fig. 1, and Fig. 3 is a sectional view taken along the - line in Fig. 2. , FIG. 4 and FIG. 5 are explanatory views of a conventional liquid cargo handling device, and FIG. 6 is an explanatory cross-sectional view thereof.
FIG. 7 is a view taken along arrow A in FIG. 6. 1... Tank, 6... Holder, 7... Overflow prevention valve, 8... Loading arm, 9...
Vacuum breaker, 10...Storage tank, 11
...Drop pipe, 12...Sliding pipe, 13,14...Land part, 15,16...
Aperture, 17... hole.

Claims (1)

[Scope of utility model registration request] a loading arm connected to a storage tank; a drop pipe connected to a swinging end of the loading arm and inserted into a supplied liquid tank;
A sliding pipe fitted around the outer periphery of the drop pipe; a plurality of throttles formed at the upper end of the sliding pipe spaced apart from each other by a predetermined distance in the axial direction between the sliding pipe and the drop pipe; An annular space formed in the sliding pipe between a plurality of throttles and having an inner diameter larger than the throttle; and an annular space located between each throttle and bored in the sliding pipe and communicating with the space. A liquid cargo handling device characterized by comprising a hole.