JPS62102000A - Take out device for fuel from low temperature liquefied gas tank - Google Patents

Abstract

PURPOSE:To easily remove parts in a tank, by providing a heat insulating layer, which surrounds each side surface of a pump unit, rod and a fuel pipe so as to be isolated from low temperature liquefied gas, while a cylindrical body which can protrude and sink from the point end of the heat insulating layer. CONSTITUTION:A heat insulating layer 10, which surrounds each side surface of a pump unit 4, rod 7 and a fuel pipe 8 so as to be isolated from liquid hydrogen 2, nd a cylindrical body 9, which can protrude and sink in the point end of said heat insulating layer 10, are provided in a fuel tank 1. In this way, since the cylindrical body 9 is sunk to inside the heat insulating layer 10 to seal the liquid hydrogen 2 by extracting the rod 7, parts in the tank can be removed with no necessity for discharging the liquid hydrogen from the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a low temperature liquefied gas tank for a gas engine. More specifically, the present invention relates to a fuel extraction device for a low-temperature liquefied gas tank.

[Prior Art] Gas engines that use low-temperature liquefied gas as fuel, such as hydrogen engines, have the advantage of producing clean exhaust and high output because they completely burn the hydrogen. will store liquefied hydrogen.

Conventionally, as shown in Fig. 5, this fuel tank 1 is covered with a double-layered heat insulating layer 3 to block the heat from the outside air because the temperature of the liquid hydrogen 2 stored therein is extremely low at 253 degrees Celsius below zero. Conventionally, the fuel extraction device for the fuel tank 1 has been constructed using a pump unit 4 which has a large surface area and easily dissipates heat from the outside air into the tank in order to enhance the insulation effect of the tank l and prevent evaporation of the liquid hydrogen 2. is installed near the inner bottom of the tank 1 together with the filter 5, a drive unit 6 for driving the pump unit 4 is installed at the top of the tank 1, and a loft 7 with a small surface area is installed between the drive unit 6 and the pump unit 4.
It is connected with. If the length of this rod 7 is shortened, heat from the outside air is easily conducted to the pump unit 4, so in the conventional device, a part of the tank l has a bulge 1. a, and rod 7
The length of the rod 7 is increased by passing the fuel pipe 8 that guides the liquid hydrogen 2 sent out by the pump unit 4 to the outside of the tank 1 into the bulging portion 1a.
It was designed to increase the insulation effect of the

[Problems to be Solved by the Invention] However, since the bulging portion 1a is sealed by the upper plate 1b,
When the pump unit 4, rods, etc. are worn out and the parts are to be repaired or replaced, there is a problem in that the upper plate 1b cannot be removed until after the liquid hydrogen in the tank has been discharged.

An object of the present invention is to provide a fuel removal device for a hydrogen liquid fuel tank that allows parts inside the tank to be easily removed without discharging the liquid hydrogen inside the tank.

[Means for Solving the Problems] The configuration of the present invention for achieving the above object will be explained based on FIG. 1.

The fuel extraction device of the present invention includes a heat insulating layer lO that surrounds each side of the pump unit 4, rod 7, and fuel pipe 8 so as to isolate them from the low temperature liquefied gas 2, and a heat insulating layer lO that can freely appear and retract from the tip of the heat insulating layer lO. A cylindrical body 9 is provided.

[Function] Before the pump unit 4 is attached, the cylindrical body 9 is immersed in the heat insulating layer 10 to seal the opening of the heat insulating layer, and after the pump unit 4 is attached, the cylindrical body 9 is inserted into the tank 1. It protrudes and acts to draw the low-temperature liquefied gas 2 in the tank into the cylindrical body 9. This allows the pump unit 4 inside the tank to
Even if the rod 7 and the like are pulled out, the low-temperature liquefied gas in the tank does not come into contact with the outside air.

[Example] Next, one embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 2 to 4, the fuel tank 1 is covered with a heat insulating layer 3 in which a vacuum is created between the outer plates of a double structure made of stainless steel in order to store liquid hydrogen 2. fuel tank l
A pump unit/ ) 4 is provided inside the pump unit. The pump unit 4 includes a piston 11, a cylinder 12, a suction valve 13, a discharge valve 14, and a receiver 15. Suction valve 13
A filter 5 is provided around the area. Further, a drive unit 6 for driving the pump unit 4 is provided on the flat outside of the tank l, passing through the upper plate 1b. The drive unit 6 includes a crankshaft 18 and a connecting rod 19 driven by a motor (not shown). The tip of the connecting rod 19 and the piston 11 are connected by a rod 7.

Further, a fuel pipe 8 is connected to the upper part of the receiver 15. This fuel pump 8 is piped to the outside of the tank l along the rod 7. A pressure regulating valve 20 is provided in the middle of the fuel pipe 8.

The characteristic configuration of the present invention is that the pump unit 4 and the rod 7
and a heat insulating layer 10 surrounding each side of the fuel pipe 8 so as to isolate it from the liquid hydrogen 2, and a cylindrical body 9 retractable from the tip of the heat insulating layer 10.

That is, like the heat insulating layer 3, the heat insulating layer 10 is a vacuum heat insulating layer in which the space between the outer panels of the double structure is evacuated.

Further, as shown in FIGS. 3 and 4, the cylindrical body 9 has a sealed tip, has a diameter and length that can accommodate the pump unit 4 and the filter 5, and can slide inside the heat insulating layer 10. I'm starting to get it. A coil spring 21 is interposed between the outer surface of the cylindrical body 9 and the inner surface of the heat insulating layer 10. This spring 21 acts to sink the cylinder 9 into the heat insulating layer 10 when the pump unit 4 etc. are not inserted into the cylinder 9 (FIG. 3). Further, a communication hole 22 is formed in the side near the tip of the cylinder 9. 23 is a seal provided on the inner surface of the tip of the heat insulator M10, and 24 is a seal provided on the center inner surface of the cylindrical body 9.

With such a configuration, when the pump unit, shaft 4 and filter 5 are attached via the rods as shown in FIG.
protrudes from the tip of In this state, the liquid hydrogen 2 in the tank 1 is taken into the cylindrical body 9 through the communication hole 22, and the seal 2
3 and 24 prevent leakage outside the cylindrical body 9.

Here, if it becomes necessary to repair the rod 7 or the pump unit 4, etc., remove the upper plate 1b and pull out the rod 7, and as shown in FIG. Since the body 9 is immersed inside the heat insulating layer 10 and the communication hole 22 is sealed by the seal 23, the liquid hydrogen 2 is absorbed into the cylindrical body 9.
Do not leak outside.

In addition, in the above example, hydrogen was shown as an example of the low-temperature liquefied gas, but the low-temperature liquefied gas of the present invention is not limited to this, and may include natural gas,
Other low temperature liquefied gases such as liquefied petroleum gas can be used.

[Effects of the Invention] As described above, according to the present invention, liquid hydrogen was conventionally discharged from the tank when it was necessary to take out the rod or pump unit. Even if these parts are removed, the tank remains sealed, so the parts inside the tank can be removed quickly and easily without draining liquid hydrogen from the tank.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a fuel extraction device for a low-temperature liquefied gas tank according to the present invention. FIG. 2 is an enlarged sectional view of a main part of an apparatus according to an embodiment of the present invention. FIG. 3 and FIG. 4 are enlarged sectional views of the tip of the heat insulating layer. FIG. 5 is a sectional view of a conventional device. 1: Fuel tank, 2: Low temperature liquefied gas (liquid hydrogen), 3,
10: Heat insulation layer, 4: Pump unit, 6: Drive unit, 7: Rod, 8: Fuel tank, 9: Cylindrical body. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1) A pump unit for delivering the low-temperature liquefied gas to the engine inside a fuel tank in which the low-temperature liquefied gas is liquefied and stored, and a drive unit for driving the pump unit outside the tank; A low-temperature liquefied gas tank comprising a rod connecting the pump unit and the drive unit inside the tank, and a fuel pipe along the rod that guides the low-temperature liquefied gas delivered by the pump unit to the outside of the tank. The fuel extraction device includes a heat insulating layer that surrounds each side of the pump unit, the rod, and the fuel pipe so as to isolate them from low-temperature liquefied gas, and a cylinder that can freely extend and retract from the tip of the heat insulating layer. Before the pump unit is installed, the body sinks into this insulation layer and seals the opening of the insulation layer, and after the pump unit is installed, it protrudes into the tank and absorbs the low-temperature liquefied gas in the tank. A fuel extraction device for a low-temperature liquefied gas tank, characterized in that it is configured to take in a.