JPH02230976A - Double acting piston pump - Google Patents

Abstract

PURPOSE:To obtain a constant discharge quantity with no fluctuation and high precision by providing piston rods with the same diameter on both sides of a piston, sealing a permanent magnet in the piston, and moving the piston with a magnet on the outside of a cylinder. CONSTITUTION:A piston 1 has piston rods 4 and 5 with the same diameter on both sides. Key groove-shaped guide grooves 2 and 3 are provided at fixed angle positions at both ends of the piston 1. When the piston rod 4 is pulled to the right direction, a liquid is discharged to a discharge port 11 through the guide groove 2. When the piston 1 is rotated by a fixed angle then pulled back to the left direction, the liquid is discharged to a discharge port 12 through the guide groove 3. A permanent magnet 14 is sealed in the piston 1, and the piston operation is performed by an electromagnet 15 on the outside of a cylinder 6. A constant discharge quantity with no fluctuation and high precision is obtained.

Description

[Detailed description of the invention] (Industrial profit field) The invention is a pump for liquid and gas transfer.

(Prior Art) FIG. 4 shows an example of a single-acting piston pump. When the piston rod 4 is pulled, the pressure inside the cylinder 6 is reduced due to the movement of the piston 1, and the suction valve 16 opens to generate suction. When the piston rod 4 is pushed in, the inside of the cylinder 6 is compressed by the movement of the piston 1, and the discharge valve 17 opens to cause discharge. In this bomb, the piston reciprocates and discharges in only one direction, so the discharge is a pulsating flow.

FIG. 5 shows an example of a double-acting piston pump.

In this bomb, there is one suction valve l6 and one discharge valve 17 on each side of the cylinder 6, a common suction pipe l8 and an air chamber 1.
It is connected to 9. Due to the movement of the piston l, one ejection is performed in both reciprocations. Figure 6 is an example of a differential piston pump. When the piston rod 4 is pulled, a volume corresponding to the stroke of the piston 1 is sucked into the left chamber 8 of the cylinder, and when the piston rod 4 is pushed back, a volume corresponding to the stroke of the piston 1 is sent to the right chamber 7 of the cylinder.

The difference in volume with the piston rod 4 remains in the right chamber 7 of the cylinder, and the rest is allowed to flow out. Therefore, evacuation occurs during any reciprocating movement of the piston l. In the double-acting piston pump shown in Figure 5, the volumes of the left and right cylinders differ by the volume of the piston rod, and the reciprocating displacement differs. In the differential piston pump shown in Fig. 6, the reciprocating discharge pipe is restricted to be the same only when the area ratio of the piston diameter to the piston rod diameter is exactly 2 = 1, and the discharge is performed via two cylinders. There are structural problems. (Means to Solve the Problem) The present invention provides reciprocating movement of the piston by providing piston rods of the same diameter on both sides of the piston in a double-acting piston, or by eliminating the piston rod and indirectly driving the piston with a magnet. The discharge product was made the same.

In addition, the alignment of the keyway-shaped guide grooves provided at certain angular positions on the left and right sides of the piston with the discharge port and suction port of the cylinder,
A simple structure was achieved by using a discharge valve and a suction valve that utilize mismatching caused by rotating the piston at a certain angle. {Example) (1) FIG. 1 is an explanatory diagram of the operation of the double-acting piston pump of the present invention. To explain Fig. 1(a), the piston l has piston rods 4 and 5 of the same diameter on both sides, and a key spiral guide corresponding to the length of the piston stroke is placed at a constant angle position on both ends of the contact surface with the cylinder 6. It has grooves 2 and 3. The cylinder 6 has an inlet 9 and 10 and an outlet 11 and 12 in the same angular position as the key spiral guide grooves 2 and 3 of the piston 1 and located inwardly by the length of the piston stroke.

When the piston rod 4 is pulled to the right, the cylinder right chamber 7 is compressed by the movement of the piston l, and the keyway-shaped guide groove 2
The liquid is discharged through the outlet port 1l. On the other hand, suction occurs in the cylinder left chamber 8 from the suction port 9 through the keyway-shaped guide groove 3. When the piston 1 reaches the right end of the cylinder 6, as shown in FIG. 1(b), when the piston 1 is rotated by a certain angle and then pushed back to the left, the left chamber 8 of the cylinder is compressed and the keyway-shaped guide groove 3 and is discharged to the discharge port 12. On the other hand, the suction port 10 to the cylinder right ventricle "7"
It is sucked in through the keyway-shaped guide groove 2.

(2) FIG. 2 is an explanatory diagram of the operation of a double-acting piston pump driven by a magnet without a piston rod. The piston l encloses a permanent magnet 14, and the piston 1 is moved within the cylinder 6 by the movement of electromagnets l5 and 16 placed outside the cylinder 6, and the electromagnets l5 and l6
Piston l is rotated by a certain angle by changing the magnetic pole of. Other operations are shown in Figures 1 (a) and (b) in the previous section (1).
is the same as

(3) FIG. 3 shows an embodiment of a double-acting piston pump designed for high-pressure pumps. The operation is the same as in Figures 1 (a) and (b), but seal rings l3 are added at key points.
has been applied. (Effects of the Invention) According to the present invention, the following effects can be obtained.

(1) By using a combination of a ball screw and a stepping motor as the mechanism for the reciprocating movement of the piston, instead of using a conventional crank mechanism, a highly accurate and constant ejection without pulsating flow can be obtained.

(2) The combination of the piston diameter, piston rod diameter, and stroke amount allows for stable discharge of small amounts.

(3) Since the difference between the piston diameter and the piston rod diameter is the cylinder volume, the diameter that is easy to process can be selected.

(4) The structure is simple and can be manufactured at low cost.

(5) The magnet-driven pump shown in Figure 2 has good sealing performance (no worries about leaks).

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are explanatory diagrams of the operation of the double-acting piston pump of the present invention, FIG. 2 is an explanatory diagram of the operation of the double-acting piston pump using the magnetic drive of the present invention, and FIG. 4, 5, and 6 are explanatory diagrams of conventional examples. l Electromagnetic suction valve discharge valve suction pipe air chamber

Claims (3)

[Claims] (1) Double-acting piston pump with piston rods of the same diameter on both sides of the piston. (2) A double-acting piston pump in which a permanent magnet is sealed inside the piston and the piston is moved by a magnet outside the cylinder. (3) In the double-acting piston pumps described in (1) and (2) above, keyway-shaped guide grooves are provided at fixed angle positions on both ends of the piston, and by rotating the piston at a fixed angle, the suction port and discharge port provided in the cylinder are provided. Suction and discharge valves by matching or mismatching with the ports, respectively.