JPS58211593A - Pump inserting and retracting apparatus for liquefied- gas tank - Google Patents

Abstract

PURPOSE:To enhance the reliability of pump inserting and retracting operation, by providing a float valve in a port of a carier in a vertically movable manner, and thereby making remote operation of a seal valve unnecessary. CONSTITUTION:Since a float valve 6 is pushed upward by the function of buoyancy when it comes to liquid surface 21, liquefied gas is introduced into a carrier 4. When the carrier 4 is lowered further and its conical part 4f comes into contact with a conical part 24a of a lower cover 24, the interface between the two conical surfaces is sealed positively since the pressure at the sealing surfaces of the conical parts 4f, 24a is maintained by the discharge pressure acted to a pump 12. Thus, since remote operation of a seal valve for a high-pressure liquid is made unnecessary, reliability of pump inserting and retracting operation can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inlet/output device for a pump used for pumping flammable liquefied gases such as methane, propane, butane, etc. from a tank.

Conventionally, in order to pump liquefied gas from a tank, a discharge pipe is set in the tank in a hanging state, and a submerged motor pump (hereinafter referred to as pump) is attached to the lower end of the discharge pipe.
are being inserted and installed. In this case, in order to prevent the liquefied gas in the tank from leaking to the outside, a high-pressure seal valve is provided at the lower end of the discharge pipe, and by opening and closing this seal valve, the liquefied gas is discharged. It is introduced into the pipe and shut off.

However, since the above-mentioned tanks generally have a large capacity and the length of the discharge pipe reaches several tens of meters, it is difficult to reliably open and close the seal valve by remote control from above ground. reliability may be reduced.

Furthermore, since the seal valve is deeply submerged in the liquid, high liquid pressure is constantly acting on it, making it extremely difficult to ensure sealing performance over a long period of time.

The present invention aims to solve the above-mentioned drawbacks, and includes a discharge pipe that is set in a hanging state in a liquefied gas tank, has a discharge port, and has a flange on the inner peripheral surface, and It is installed so that it can be raised and lowered, and
It consists of a carrier that is closely and removably attached to the flange and has a pump housing with a flow port on the bottom, and a float valve that is movable up and down in the flow port of the carrier. That is.

DESCRIPTION OF THE PREFERRED EMBODIMENTS All drawings of an embodiment of the present invention will be described below.

In FIG. 1, 1 is a discharge pipe set in a hanging state in a tank 11, and this pipe 1 has a discharge port 1a (i7) connected to a discharge nozzle 2, and a flange 1b is provided on the upper inner peripheral surface. 3 is an upper cover attached to the top end of the discharge pipe l, 4 is a flow port 4c1 on the bottom surface 4b.
It has a pump storage chamber 4a'z provided with r, and on the outer peripheral surface,
Lower flange 4d.

4e, this carrier 4 is provided to freely move up and down within the discharge pipe 1 via guide rollers 5a and 5b'i attached to upper and lower flanges 4d and 4e, respectively, and It is removably attached to the flange 1b of the pipe 1 via a lifting bolt 8.

Reference numeral 6 denotes a float valve that is inserted into the flow port 4c of the pump storage chamber 4a and moves up and down along a guide pin 9 attached to the bottom surface 4b of the pump storage chamber 4C.
As shown in FIG. 2, a pin hole 9a into which a guide pin 9 is inserted is provided.

When the carrier 4 is held in the state shown in FIG. 1, the float valve 6 has its own weight to provide sufficient surface pressure to seal the bottom surface 4b'l of the pump storage chamber, and floats in the liquid due to buoyancy. It is formed to have a sufficient volume. 7 is a stopper that is placed on the float valve 6 and comes into contact with the pump body (not shown) to prevent the float valve 6 from floating and serves to regulate the flow; 10 is a carrier 4;
This bolt is attached to the upper flange 4d provided in the upper flange 4d.

Next, a case will be described with reference to FIG. 3, in which a submerged motor pump is inserted and set into the discharge pipe 1 using this embodiment having the above-described configuration.

First, the upper cover 3 is completely removed, and the submerged motor pump 12 consisting of the pump part 12a and the motor part 12b, which has the entire suction port 12a, is suspended by the wire 14 wound around the hoist 13.
It is stored in the pump storage chamber 4a of the carrier 4 by hanging down through the pump storage chamber 4a of the carrier 4. Next, after attaching the pump 12 to the carrier 4 using 10, connect the carrier 4 and the discharge pipe 1.
When the coupling bolt 8 is loosened to release the coupling, the carrier 4 is suspended by the suspension wire 14 via the pump 12. Next, the suspension wire 14 and the motor cable 17 wound around the motor cable winding device 18 are passed through the through holes 15° 19 of the upper cover 3, respectively.
An upper cover 3 is attached to the top end of the discharge pipe 1 to close it off. In this case, the liquefied gas in the discharge pipe 1 is connected to the flange 1b of the discharge pipe 1 and the upper part 7 flange 4 of the carrier 4.
d and is completely shut off by the float valve 6.

After completing the above operations, the suspension wire 14 and the motor cable 17 are let out from the hoist 13 and the cable winding device 18, respectively, and the pump 12 is lowered into the discharge pipe 1. Immediately after this descent, the liquefied gas in the discharge pipe 1 flows between the flanges lb and 4d and reaches the upper cover 3, so it is fed to the through hole 15.19 via the inert gas supply pipe 16.20t. Inert gas is fully injected to prevent liquefied gas from leaking from the through holes 15 and 19.

When the float valve 6 reaches the liquid level 21, the float valve 6
is pushed up by the action of buoyancy, so the liquefied gas is introduced into the carrier 4. As the carrier 4 further descends, its conical portion 4f reaches the conical portion 24a of the lower cover 24 attached to the lower end of the discharge pipe 1, as shown in FIG.
When the two conical portions 4f and 24a are connected to each other, the sealing surface pressure of both conical portions 4f and 24a is maintained by the discharge pressure acting on the pump 12, so that reliable sealing is achieved.

At this time, the float valve 6 rises along the guide pin 9 due to buoyancy until the stop valve comes into contact with the suction port 12a, so that a suction port with a sufficient area can be secured. Further, the reaction force of the rotational torque of the motor 12b is stopped by a rotation stopper pin 25 provided on the lower cover 24 of the discharge pipe 1.

Finally, the hanging wire 14 is connected by a blind flange 26.
The motor cables 17 are each sealed against pump discharge pressure by seven flange 27 coupled to a power supply terminal 28.

Although the above description has been made regarding the case where the pump 12 is inserted, when the pump 12 is to be pulled up, the above procedure may be reversed. At this time, remove the upper cover 3 and remove the pump 12.
Before taking out from the discharge pipe 1, the liquefied gas filling the carrier 4 and between the carrier 4 and the upper cover 3 is replaced with inert gas supplied and discharged through the pipes 22 and 231. shall be.

As explained above, according to the present invention, there is no need to remotely control the conventional high-hydraulic seal valve, so the reliability of the pump opening and closing operations can be improved. Furthermore, by using the carrier to reliably move the pump up and down, it is possible to not only improve workability but also to prevent the pump from coming into contact with the discharge pipe and being damaged.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the inlet/output device for a liquefied gas tank pump according to the present invention, Fig. 2 (5) and (13) are sectional views and plan views of a float valve used in the embodiment, 3 and 4 are cross-sectional views showing the process of inserting a submerged motor pump using the same embodiment. 1...Discharge pipe, 1a...Discharge port, 1b...
Flange, 4... Carrier, 4a... Pump storage chamber, 4c... Distribution port, 5a, 5b... Guide roller, 6... Flow f' Y z port (A) 4. B-n

Claims (1)

[Claims] a discharge pipe that is set in a hanging state in a liquefied gas tank, has a discharge port and has a flange on its inner peripheral surface;
It is provided in the discharge pipe so as to be movable up and down, and is attached to the seven lunges in close contact and removable,
Moreover, it consists of a carrier equipped with a pump storage chamber with a flow port on the bottom, and a float/valve that is movable up and down in the flow port of this carrier. 1. A liquefied gas tank pump inlet/output device, characterized in that the pump is closed automatically and automatically opened when the pump is submerged in liquefied gas.