JP4969532B2 - Low temperature liquefied gas pressure pump - Google Patents

Description

  The present invention relates to a low-temperature liquefied gas pressure pump used for pumping low-temperature liquefied gas (for example, liquid hydrogen or liquefied natural gas).

As a low-temperature liquefied gas pressurization pump used for pumping a low-temperature liquefied gas, for example, the one disclosed in Patent Document 1 is known.
Japanese Patent No. 3499944

  Further, from the viewpoint of improving the pump efficiency, it is desirable that as much low-temperature liquefied gas as possible be sucked into the cylinder while being liquid and compressed. Therefore, in recent years, a cylinder-immersed low-temperature liquefied gas is operated in which a cylinder is housed in a cylindrical container into which liquid low-temperature liquefied gas is supplied, and the cylinder is immersed in the liquid low-temperature liquefied gas. A booster pump has been proposed.

  However, when the low-temperature liquefied gas booster pump is immersed in the cylinder, the entire cylinder must be immersed in the liquid low-temperature liquefied gas during operation, and the cylindrical container must be placed upright or obliquely. Don't be. Further, it is necessary to pull out the cylindrical container in the axial direction during maintenance. Therefore, when the cylindrical container is placed in an upright state, a working space must be secured below the cylindrical container, and the height dimension becomes large. There was a point. On the other hand, when the cylindrical container is arranged in an oblique state, the workability during maintenance is improved, but there is a problem that the dimensions in the lateral direction or the width direction become large.

  The present invention has been made in view of the above circumstances, and provides a high-efficiency low-temperature liquefied gas booster pump capable of reducing the size of the entire apparatus and improving workability during maintenance. For the purpose.

The present invention employs the following means in order to solve the above problems.
The low-temperature liquefied gas booster pump according to the present invention includes a cylinder, a piston that reciprocates in the cylinder, and a container that houses the cylinder and is supplied with a liquid low-temperature liquefied gas. And a base having a base fixed on the installation surface and a frame that extends vertically upward from the upper surface of the base and rotatably supports the pump body. The cylinder is kept in an upright state, the cylinder is kept immersed in a liquid low-temperature liquefied gas, and the pump main body is kept in an inclined state during maintenance.

  According to the low-temperature liquefied gas booster pump according to the present invention, the pump body is set up vertically and is operated in a state where the entire cylinder is immersed in the low-temperature liquefied gas, and is inclined (for example, inclined 45 degrees), Since the work space is secured between the bottom of the pump body and the top surface of the base, and maintenance is performed with the bottom of the pump body raised to the waist of the operator, it is liquefied at a low temperature. Gas can be reliably compressed, and maintainability can be improved.

  In the low-temperature liquefied gas booster pump, it is more preferable that the pump body includes a plurality of cylinders, pistons, and containers.

  According to such a low-temperature liquefied gas booster pump, when one piston is in the compression process, the other piston is in the suction process, and when one piston is in the suction process, the other piston is in the compression process. Therefore, the regenerative energy can be used, the power of the electric motor 6 can be reduced, and the running cost can be reduced.

In the low-temperature liquefied gas booster pump, it is more preferable that the liquid low-temperature liquefied gas compressed in one cylinder has a multistage compression structure in which it is further compressed in another cylinder.
That is, rather than trying to increase the pressure of the liquid low-temperature liquefied gas from atmospheric pressure to high pressure at once, the liquid low-temperature liquefied gas is once pressurized to an intermediate pressure, and then the liquid low-temperature liquefied gas is brought to a desired pressure (high pressure) More preferably, it is configured to pressurize.

  According to such a low-temperature liquefied gas booster pump, the stroke of the piston can be reduced, the overall height of the pump can be shortened, and the pump can be further miniaturized.

  According to the low-temperature liquefied gas booster pump of the present invention, the entire apparatus can be reduced in size, and the workability during maintenance can be improved.

Hereinafter, an embodiment of a low-temperature liquefied gas booster pump (hereinafter referred to as “a booster pump”) according to the present invention will be described with reference to FIGS. 1 to 11.
1 is a perspective view of a booster pump according to the present embodiment, showing a state during operation, FIG. 2 is a front view of the booster pump shown in FIG. 1, and FIG. 3 is a rear view of the booster pump shown in FIG. 4 is a right side view of the booster pump shown in FIG. 1, FIG. 5 is a left side view of the booster pump shown in FIG. 1, FIG. 6 is a plan view of the booster pump shown in FIG. 8 is a bottom view of the pump, FIG. 8 is a perspective view of the booster pump according to this embodiment, showing a state during maintenance, FIG. 9 is a front view of the booster pump shown in FIG. 8, and FIG. 10 is shown in FIG. FIG. 11 is a bottom view of the booster pump shown in FIG. 8.

As shown in FIGS. 1 and 11, the booster pump 1 according to the present embodiment is configured with a pump body 2 and a gantry 3 as main elements.
The pump body 2 includes a plurality (two in this embodiment) of cylinders (not shown) and a plurality of (two in this embodiment) pistons (not shown) that reciprocate in each cylinder. I have. Moreover, each cylinder is accommodated in the sump (container) 4 provided corresponding to each cylinder. During operation, a low temperature liquefied gas (for example, liquid hydrogen) is accumulated in the sump 4, and the low temperature liquefied gas sucked into the cylinder is immersed in the low temperature liquefied gas. Gas will be compressed.

Each piston is connected to one end (lower end) of a piston rod (not shown) provided corresponding to each piston, and the other end (upper end) of the piston rod is connected to a connecting rod (not shown). To the arm portion of a crankshaft (not shown).
It should be noted that the arm portion of the crankshaft is such that one arm portion projects to the opposite side of the other arm portion, that is, when one piston is at the bottom dead center, the other piston is at the top dead center. And, when one piston is at the top dead center, the other piston is formed at the bottom dead center.

The center portion and both end portions of the crankshaft are supported by the casing 5 via a plurality of (three in this embodiment) free eccentric roller bearings (not shown). A V pulley (not shown) is attached to the tip of one end of the crankshaft. This V pulley and a V pulley (attached to the tip of one end of the rotating shaft of the electric motor 5 serving as a drive source). A V-belt (not shown) is wound around (not shown). Then, when electric power is supplied to the electric motor 6 and the rotation shaft of the electric motor 6 and the V pulley rotate, the V belt and the V pulley attached to one end of the crank shaft rotate together, and the crank shaft rotates. At the same time, each piston reciprocates in the corresponding cylinder to compress the low-temperature liquefied gas sucked into the cylinder.
Reference numerals 7 and 8 in the figure respectively denote a supply pipe for supplying a low-temperature liquefied gas into the sump 4 and an exhaust for discharging the boil-off gas (BOG) evaporated (vaporized) inside the sump 4 to the outside of the sump 4. It is a tube.
Further, a V pulley attached to the tip of one end of the crankshaft, a V pulley attached to the tip of one end of the rotating shaft of the electric motor 5, and a V belt wound between these V pulleys are pumps. The main body 2 is housed in a casing 10 that also serves as a frame and supports one side (the left side in FIG. 2 and the upper side in FIG. 6) in a rotatable manner.

The gantry 3 includes a base 9 fixed on an installation surface (not shown) and a casing 10 also serving as a frame that extends vertically upward from the upper surface of the base 9 and rotatably supports one end of the pump body 2. And a frame 11 that extends vertically upward from the upper surface of the base 9 and rotatably supports the other end of the pump body 2 (the right side in FIG. 2 and the lower side in FIG. 6). Yes.
The base 9 has a rectangular shape in plan view and bottom view, and the electric motor 6 is fixed on the top surface.

According to the booster pump 1 according to the present embodiment, the pump body 2 is set up vertically and is operated in a state where the entire cylinder is immersed in a low-temperature liquefied gas, and is slanted (for example, slanted 45 degrees), Since a working space is secured between the bottom of the pump body 2 and the upper surface of the base 9, and maintenance is performed with the bottom of the pump body 2 raised to the waist of the operator, the apparatus The overall size can be reduced, the low-temperature liquefied gas can be reliably compressed, and the maintainability can be improved.
Further, when one piston is in the compression process, the other piston is in the suction process, and when one piston is in the suction process, the other piston is in the compression process. The power of the electric motor 6 can be reduced, and the running cost can be reduced.

In the above-described embodiment, it is more preferable that the liquid low-temperature liquefied gas compressed in one cylinder is guided into another cylinder and further compressed in another cylinder. .
That is, rather than trying to increase the pressure of the liquid low-temperature liquefied gas from atmospheric pressure to high pressure at once, the liquid low-temperature liquefied gas is once pressurized to an intermediate pressure, and then the liquid low-temperature liquefied gas is brought to a desired pressure (high pressure) It is comprised so that it may pressurize.
Thereby, the stroke of a piston can be made small, the magnitude | size of the height direction of the whole pump can be shortened, and a pump can be further reduced in size.

  In the above-described embodiment, the pump main body 2 including two cylinders, pistons, and containers has been described. However, the present invention is not limited to this, and the pump main body includes a cylinder, piston, and One container or three or more containers may be provided.

It is a perspective view of the low temperature liquefied gas pressurization pump concerning one embodiment of the present invention, and is a figure showing the state at the time of operation. It is a front view of the pressure | voltage rise pump shown in FIG. It is a rear view of the pressure | voltage rise pump shown in FIG. It is a right view of the pressure | voltage rise pump shown in FIG. It is a left view of the pressure | voltage rise pump shown in FIG. It is a top view of the pressure | voltage rise pump shown in FIG. It is a bottom view of the booster pump shown in FIG. It is a perspective view of the low temperature liquefied gas pressurization pump concerning one embodiment of the present invention, and is a figure showing the state at the time of maintenance. It is a front view of the pressure | voltage rise pump shown in FIG. It is a right view of the pressure | voltage rise pump shown in FIG. It is a bottom view of the booster pump shown in FIG.

Explanation of symbols

1 Low-temperature liquefied gas pressure pump 2 Pump body 3 Base 4 Sump (container)
9 Base 10 Casing (frame)
11 frames

Claims (3)

A pump body including a cylinder, a piston that reciprocates in the cylinder, and a container in which the cylinder is housed and supplied with a liquid low-temperature liquefied gas;
A base having a base fixed on the installation surface, and a frame extending vertically upward from the upper surface of the base and rotatably supporting the pump body;
The pump body is kept upright during operation, the cylinder is kept immersed in a liquid low-temperature liquefied gas, and the pump body is held in an inclined state during maintenance. A low-temperature liquefied gas pressure pump characterized by being made.   The low-temperature liquefied gas pressure pump according to claim 1, wherein the pump body includes a plurality of cylinders, pistons, and a container.   3. The low-temperature liquefied gas booster pump according to claim 2, wherein the liquid low-temperature liquefied gas compressed in one cylinder has a multistage compression structure in which the liquid is further compressed in another cylinder.

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