JPH0953567A - Indirect type high pressure pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform high pressure conveyance of liquid, such as gasoline and water, being short of lubricity, by a method wherein by changing the volume of a pressure chamber, a liquid pressure is generated balancing between a pump chamber and a pressure chamber, which are partitioned away from each other by a partition wall. SOLUTION: When a plunger 3 is moved in a cylinder 4 to the right, liquid in a pressure generating chamber 1 is pressurized by an mount equivalent to a moving amount of the plunger 3. Pressurized liquid expands the diaphragm 6 toward the pump chamber 2 side. In this case, the diaphragm 6 is worked only as a partition wall. Provided liquid is injected in the pump chamber 2 side to pressurize the pressure chamber 1, a pressure is increased so far as a pressure not to leak through a gap between the cylinder 4 and the plunger 3. By increasing the mechanical strength of the constitutional part, a high pressure is generated by means of fluid to sufficiently lubricate a pressure generating part. Thus, as a pressure generating part is sufficiently lubricated, a pump part partitioned by a partition wall 6 is capable of conveying liquid, being short of lubricity, at a high pressure.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Pumps for the purpose of transporting liquids with poor lubricity, such as gasoline and water, at high pressure.

[0002]

2. Description of the Related Art When a liquid having poor lubricity is conveyed at a high pressure, the gap in the pressure generating portion is made as small as possible, but a problem such as burning of a pump is likely to occur.

[0003]

[Problems to be Solved by the Invention] When attempting to convey a liquid having poor lubricity at a high pressure, the precision of the parts of the pressure generating part of the pump is precisely finished, and an extra device is attached for the purpose of lubrication to protect the parts. Since other materials are mixed with the transported object for the purpose of improving lubrication or an expensive material is required, a pure transported object cannot be obtained or the cost is increased.

[0004]

According to the present invention, a portion for generating a pressure and a portion for conveying an object are partitioned by a partition, and a pressure generating portion is lubricated and pressurized with a liquid having a good lubricating property, and the other pump is used. The chamber solves the above-mentioned problems by performing the pumping action by utilizing the change in the volume due to the deformation or movement of the wall space.

[0005]

When the plunger is moved to the right in the cylinder communicating with the pressure generating chamber, the liquid in the pressure generating chamber is pressurized by the moving amount of the plunger. The pressurized liquid is the diaphragm. Is inflated to the side of the pump chamber where the pressure is low, the amount of change changes to a position where the pressure in the pressure chamber and the pressure in the pump chamber are balanced. At this time, the same pressure is applied to both sides of the diaphragm, and the diaphragm simply acts as a partition. It only serves a role. If liquid is put into the pump chamber side and sealed to pressurize the pressure chamber, the pressure theoretically rises infinitely unless it leaks from the gap between the synrider of the pressure chamber and the plunger. If the mechanical strength of these components is increased, a desired high pressure can be obtained by using a liquid that can sufficiently lubricate the pressure generating portion. Therefore, while sufficiently lubricating the pressure generating portion, the pump portion partitioned by the partition wall has poor lubricity and can convey the liquid at high pressure.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining with reference to the drawings, the inside of a cylinder and a pressure chamber communicate with each other. A pump chamber is provided with a partition wall (described here as a diaphragm) being separated. The pump chamber is provided with a check valve (hereinafter referred to as an inlet port) that allows the inflow only toward the inside of the pump chamber and a check valve (hereinafter referred to as an outlet port) that allows only the inflow from the inside of the pump chamber to the outside. The inlet port communicates with a tank that stores the liquid of the object to be transported (the drawing is omitted). The outlet port communicates with a pipe for guiding the liquid to be transported (illustration omitted). A slidable plunger is inserted inside the cylinder, and a stable hole is formed in the cylinder so that oil can always flow into the cylinder. The movable range of the plunger to the right is to a position where it does not harm the bulkhead by colliding with it, and the movable range to the left is to the position where the stabilization hole is fully released, or further to the left. It can also be designed to generate a small amount of pressure inside the cylinder to stabilize the volume when the plunger moves to the right after moving and sucking a sufficient amount of oil. The amount of change in the volume due to the movement of the plunger in the cylinder is within the deformation limit range of the diaphragm to protect the diaphragm. The part including the stabilizing hole of the cylinder and the plunger part are in the housing filled with oil having excellent lubricity. In this figure, since it is assumed that the plunger is moved by the cam, a spring for pushing the plunger back is provided.
(The cam part is not shown in the drawing.) Furthermore, there is an air vent hole in the upper part of the pressure chamber that communicates with the inside of the housing. The air inside the pressure chamber and cylinder is vented during initial operation, and during normal operation this hole is tightly closed with a plug. . When bleeding air during initial operation, it is better to bleed the air vent hole sufficiently with oil. Explaining the operation from the state where the air inside the pressure chamber and the pressure generating chamber is completely deflated,
Since the amount of oil that flows into the pressure chamber increases when the plunger moves to the right and closes the stabilizing hole, the diaphragm swells to the pump chamber side, so the liquid inside the pump chamber is discharged from the outlet port (here The important thing is that the pressure on the pressure chamber side of the diaphragm and the pressure on the pump chamber side are equal.If the outlet port is blocked, the pressure in both chambers will rise indefinitely within the mechanically endurable range. Therefore, the desired high pressure can be obtained by increasing the strength of these parts, and a completely different liquid can be used for the pump chamber and the pressure chamber, so that the plunger and cylinder are sufficiently lubricated. It is possible to send high sludge with poor slidability such as water or gasoline by using oil etc.) Plunger moves to the left. Begin the pressure chamber, to become a negative pressure, and also Sodo the diaphragm to its original shape, thus inhales the liquid from the inlet port from the the pump chamber becomes a negative pressure. A pumping action is performed by repeating this. Pressurizing the liquid flowing into the inlet port within the range allowed by the mechanical strength of the diaphragm makes it easy to obtain a stable discharge amount. Although a diaphragm is used in the drawing, a bellows, a free piston, or the like can be used as the partition wall. The partition wall can be made so that the pressure chamber side and the pump chamber side are made of different materials so as not to be affected by the liquids used.

[0007]

As described above, since the portion that generates pressure can be sufficiently lubricated, it is possible to make a pump that can obtain high pressure without burning even if the gap is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of the present invention.

[Explanation of symbols]

1 Pressure Chamber 2 Pump Chamber 3 Plunger 4 Cylinder 5 Stabilizing Hole 6 Diaphragm 7 Inlet Port 8 Outlet Port 9 Spring 10 Housing 11 Liquid Level

Claims (1)

[Claims] 1. A pump that uses a combination of two chambers partitioned by a deforming or moving partition wall, one of which is a pressure generating chamber and the other of which is a pump chamber. Even if different liquids are used for the pressure chamber and the pump chamber, they may be mixed. A pump characterized by having a structure that does not have a structure, and by performing a pumping action by changing the volume of the pressure chamber to generate a hydraulic pressure in equilibrium with the pressure chamber in the pump chamber that separates the partition wall.