JPS5939980A - High-pressure feed pump - Google Patents

Abstract

PURPOSE:To improve efficiency of a pump through a simple constitution, by a method wherein a fixed piston at the lower end of a first rod engages with a movable cylinder at the lower end of a second rod, and a suction valve installed to the cylinder is opened and closed by inertia according to movement of the cylinder. CONSTITUTION:When, with a crank 26 rotated, a slider 22 moves downward within a guide frame 50 through the medium of a connecting lever 24, a second rod 16 and a cylinder 20 move downward. A suction valve 32 is left approximately at its original position by inertia, and fluid in a storage tank 54 is sucked in a pump chamber 28 through suction ports 30. When, with the crank 26 rotated, the slider 22 moves upward through the medium of the connecting lever 24, the second rod 16 and the cylinder 20 move upward, the suction valve 32 is closed, and fluid in the pump chamber 28 pushes upward a discharge valve 36 through a passage 14 to discharge high-pressure fluid through a discharge pipe 38.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure pump with a piston fixed at 9% engagement and a cylinder moved to perform a pumping action and increase the discharge pressure.

Conventionally, in order to pump cryogenic fluids such as liquid hydrogen from storage tanks, piston ronds have used hollow tubes with a small cross-sectional area to prevent heat transfer from the outside world as much as possible. There is an inconvenience that buckling of the piston rond occurs due to stress. Furthermore, there is a disadvantage that the suction valve may respond to the high-speed reciprocating movement of the piston, and as a result, the fluid cannot be delivered at the desired high pressure.

Note that the necessity of pumping a cryogenic fluid such as liquid hydrogen arises, for example, when this liquid hydrogen is used as a fuel for an internal combustion engine. It is desirable to feed liquid hydrogen at a high pressure, preferably about 100 to 7/crl, and high pressure feeding improves the dispersion of the injected fuel and greatly improves the combustibility of Ill. It was hoped that this would become a reality.

The object of the invention is therefore to eliminate the above-mentioned drawbacks.

A movable cylinder is provided, and a suction valve is provided that responds to the movement of the cylinder, allowing fluid to be pumped at a high discharge pressure, and at the same time does not allow outside heat to flow into the cryogenic fluid storage tank. There is a pump in place.

In order to achieve this object, the present invention provides a fixed piston at the lower end of the first iron. A movable cylinder that fits into the piston is provided at the lower end of the 20th tube, which has a smaller diameter than the 10th tube, and a suction valve provided on the cylinder remains open when the cylinder is moved for suction and is separated from the suction port, Further, when the cylinder is moved under pressure, it is characterized in that it is configured to collide with the suction port due to residual force and close the valve.

Embodiments of the present invention will be described in detail and specifically below based on the drawings. Figure 1.2 shows an embodiment of the invention. The high pressure pump 2 includes a piston section 4, a cylinder section 6, and a crank section 8 that reciprocates the cylinder section 6.
It is roughly composed of. The piston part 4 has a fixed piston 10, which is formed at the lower end of a tenth tube 12 made of a large diameter hollow tube.

A press-fit passage 14 through which fluid passes passes through the center of the fixed piston IO. Further, the cylinder portion 6 is configured as follows. A 20th tube 16 made of a hollow tube with a smaller diameter than the 10th tube 12 is provided in agreement with the 10th tube 12, and a connecting pipe 18 is fixed to the lower end of the 20th tube 16. 18 are vertically cut out on both sides to form a vertically elongated hole.

A cylinder 20 is provided connected to the connecting pipe 18, and the cylinder 20 is separated from the fixed piston 10. As shown in the drawing of the 20th bolt 16, a slider 22 is attached to the upper end, and a connecting rod 24 of the crank section 8 is pivotally attached to this slider 22.
It is centered on. That is, this crank portion 8 converts the rotational motion of the crank 26 into linear motion via the connecting rod 24, and further causes the cylinder 20 to reciprocate via the 20th rod 16 and the connecting pipe 18. and,
This cylinder 20 and the piston 10 form a pump chamber 28, and a suction port 30 is formed in the lower part of this cylinder 20. Further, a suction valve 32 is interposed between the pump chamber 2g and the suction port 30. Then, as shown in the first diagram, this suction valve 32 is closed, and when the cylinder 20 moves downward as a suction operation, it remains in that position, and the suction port 30 is also separated, and this suction port 30 is opened, and the pressure is supplied. When moving upward as an operation, the remaining valve collides with the valve seat 34 of the suction port 30 to close the suction port 30.

next. A discharge valve 36 is interposed at the upper end of the press-fit passage 14 provided in the piston 10 of the tenth rod 12, and the tip of the discharge valve 36 is brought into contact with the upper end opening of the press-fit passage 14, and the press-fit passage This discharge valve 3 is located at the upper end of 14.
A discharge pipe 38 is provided via 6. That is, the discharge valve 36 is pushed up by the fluid pressure from below the press-in passage 14, thereby establishing communication between the p-press-fit passage 14 and the discharge pipe 38. Further, a spring 40 is installed above the discharge valve 36 to bias the discharge valve 36 and press-fit passage 14 in the closing direction. An adjustment screw 42 for adjusting the biasing force of the spring 40 is provided on the upper part of the spring 40 and is screwed into the protrusion 44. Said first
A flange 48 is fixed to the upper end of the bolt 12 for attaching the pump body to the tank outer wall 46, and a guide frame 50 for supporting the slide 22 is fixed to the upper part of the flange 48. In addition, the reference numeral 52 indicates the bolt hole for mounting.
4 is a storage tank.

Since the present invention is constructed as described above, it operates as follows. When the crank 26 rotates and the connecting rod 24 is pushed down, the slider 22 moves downward within the guide frame 50, and together with the slider 22, the 20th bolt 16 and the cylinder 20 are moved downward. Since this downward movement of the cylinder 20 is very fast, the suction valve 32 remains approximately at its original position due to inertia. That is,
Due to the sudden descent of the cylinder 20, the suction valve 32 remains in its original position due to the influence of the pressure difference between the outside and the pump chamber 28 as well as the inertial force, and as a result, the suction valve 32 is separated from the valve seat 34. Then, the pressure in the storage tank 54 becomes higher than that in the pump chamber vane, and fluid such as liquid hydrogen is sucked into the pump chamber 28 from the storage tank 54 through the suction port 30.

Furthermore, when the crank 26 rotates and the connecting rod 24 is pulled up, the slider 22 moves upward within the guide frame 50. At this time, the 20th
Unlike the conventional model, the cylinder 16 receives the entire tensile force rather than the compressive force, and together with the slider 22, the 20th cylinder 16 and the cylinder 20
will be moved up. This upward movement of the cylinder 20 is very fast, and the suction valve 32 remains in its original position due to the action of inertia as described above, and the valve seat 34 of the cylinder 20
2 come into contact with each other to easily block this passage. This prevents liquid hydrogen from flowing backward from the suction port 30. Further, due to the upward movement of the cylinder 20, pressure is applied to the fluid sucked into the bomb chamber 30. However, the upper end of the pressure passage 14 is normally closed by a discharge valve 36.

Fluid pressure is increased within this pressure passage 14.

When this pressure fluid reaches a predetermined pressure or higher, the discharge valve 3
6 upward in the figure, overcoming the biasing force of the spring 40 biasing the discharge valve 36, and pushing the discharge valve 3 upward.
Open valve 6. The pressure passage 14 and the discharge pipe 3
8, and high-pressure fluid is discharged from this discharge pipe 38.

The reciprocating motion of this cylinder 20 is approximately 10 times per minute.
00 to 1500 degrees, which increases the discharge pressure by 6
It can be set to about 0 to 1oOK4/cn. And despite the high speed reciprocating motion of this pump.

The cylinder 20 does not reduce the pump function.
In addition, the law of inertia is utilized so that the suction valve 32 opens when the cylinder 20 moves downward for suction.

Another advantage is that the law of inertia is cleverly utilized so that the suction valve 32 closes when the pump moves upward. Moreover, the tenth rod 12 made of a hollow tube with a large diameter and the twentieth tube 16 made of a hollow tube with a smaller diameter than the tenth rod 12 are arranged with a gap,
In addition, the 20th tube, which occupies a large portion of the heat inflow path from the outside world, is made thinner by being configured to receive only tension rather than compression.

It is possible to form a small toe cross section.

Thereby, conduction and inflow of heat from the outside into the storage tank 54 can be effectively prevented.

As is clear from the above description, the present invention provides the following effects.

(1) The piston is fixed and the cylinder is moved, and a suction valve that can respond to the movement of the cylinder is provided at the tip of the cylinder, so this suction valve reliably performs its valve function and improves pump efficiency. improve.

Although the configuration is simple, the fluid can be controlled at 60 to 100 Vq.
It can be pumped at a high discharge pressure of /ca.

(2), the 10th node consisting of a large-diameter hollow tube, and this 1st node
The rod and the 20th rod, which are made of small-diameter hollow tubes, are arranged with a gap formed between them, and serve as the piston shaft and cylinder shaft, respectively, thereby preventing conduction and inflow of heat from the outside into the storage tank. It is possible.

(3), i. Since the 20th rod is configured to receive only tensile force instead of pressure and tension as in the past, there is no risk of bending, and the 20th rod can be formed thin, that is, with a small cross-sectional area. Heat entering the storage tank can be effectively blocked.

[Brief explanation of drawings]

1.2 shows an embodiment of the present invention, FIG. 1 is a sectional view of a pressure pump, and FIG. 2 is a partially enlarged sectional view of FIG. 1. In the figure, 2 is a high pressure pump, 4 is a piston part, and 6
is the cylinder part, 8 is the crank part, 12 is the first rond, 1
4 is a press-fit passage, 16 is a 20th pipe, 28 is a pump chamber, 3
0 is a suction port, 32 is a suction valve, and 34 is a valve seat. 36 is a discharge valve, 38 is a discharge pipe, and 48 is a flange for mounting. 54 is a storage tank. Agent Patent Attorney Yoshimi Saigo

Claims (1)

[Claims] A fixed piston is provided at the lower end of the 10th node, and a movable cylinder that fits into the piston is provided at the lower end of the 20th node, which has a smaller diameter than the 10th node. 1. A high-pressure pump, characterized in that the valve is opened at a distance from the suction port, and when the cylinder moves under pressure, the valve is closed by colliding with the suction port due to residual force.