JPS60252173A - Piston pump - Google Patents

Abstract

PURPOSE:To eliminate an independent changeover valve by supporting a pump cylinder rotatably in the casing while properly arranging plural pairs of suction- delivery ports in the casing thereby providing the function of change-over valve to the pump itself. CONSTITUTION:Upon advance of piston 1, the fluid to be carried in the front chamber of pump cylinder 2 is delivered through a delivery port 15b while at the same time the fluid is sucked through a suction port 14b into the rear chamber of pump cylinder 2. Upon reaching of piston 1 to the stroke end, a rotor actuator 13 will rotate the pump cylinder by 180 deg.. Consequently, the pump cylinder 2 will come to such position where the front opening 10 and the suction port 14a, rear opening 11 and the delivery port 15a will be communicated respectively. Upon retraction of piston 1, the fluid in the rear chamber of pump cylinder 2 is delivered through the delivery port 15 while simultaneously the pump cylinder 2 is rotated again by 180 deg..

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a piston pump used for pumping fluid, and particularly to a piston pump that rotatably supports a pump cylinder and has multiple pairs of suction ports and discharge ports in a casing. By providing this, a switching valve is not required, and the fluid to be sent can be pumped during the reciprocating stroke of the piston.

[Conventional technology]

Conventionally, piston pumps used to pump solid-liquid mixed-phase fluids such as ready-mixed concrete are equipped with a switching valve that is switched according to the reciprocation of the piston to suck the fluid into the pump cylinder during the backward stroke of the piston pump. , was configured to eject during the forward stroke (Utility Model Act 1986-16).
No. 541, see Utility Model Publication No. 59-16542).

[Problem that the invention seeks to solve]

Conventional piston pumps like this require a switching valve, which not only increases the size of the pump itself, but also discharges only during the forward stroke of the piston, so the fluid to be pumped cannot be pumped continuously. Therefore, a plurality of cylinders are provided, which poses a problem in that a large installation space is required.

This invention solves this problem in piston pumps.

Therefore, an object of the present invention is to provide a piston pump that does not require a switching valve;
It is an object of the present invention to provide a piston pump capable of discharging a fluid to be sent during the reciprocating stroke of the piston, and a further object of the present invention is to provide a piston pump that can be downsized and does not require a large installation space.

[Means for solving problems]

In the piston pump of the present invention, a pump cylinder in which a reciprocating piston is slidably fitted and has openings at the front and rear parts is supported rotatably about an axis within a casing. A pair of suction low discharge ports in which the opening of the rear part and the suction port communicate with each other, and an opening in the rear part and the discharge port communicate with each other; are arranged alternately at predetermined angles around the axis of the pump cylinder.

[Effect]

Since the piston pump of the present invention is configured as described above, by rotating the pump cylinder by a predetermined angle in accordance with the reciprocation of the piston, the front opening and the rear opening of the pump cylinder are alternately opened as a suction port and a discharge port. In the forward stroke of the piston, suction is performed through the rear opening and discharge is performed through the front opening, and during the backward stroke of the piston, suction is performed through the front opening and discharge is performed through the rear opening.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a piston pump that is an embodiment of the present invention, in which a pump cylinder 2 into which a piston 1 is slidably fitted is rotatably supported within a casing 3.

The piston 1 has a rear end of the bistron rod 4 (cloth in the figure, the same applies hereinafter) connected to a driving hydraulic cylinder 50 and a rod 6 through an adapter 7, and when the rod 6 of the hydraulic cylinder 5 expands and contracts, the inside of the pump cylinder 2 It reciprocates back and forth. 8 is a connecting pin, and 9 is a seal.

The pump cylinder 2 has openings 10.11 in its front and rear parts.
is provided within the casing 3 and supported by a bearing 12. The front end of the pump cylinder 2 is fixed to the output shaft 14 of the low reactor actuator 13, and by driving the low reactor unique 13, the pump cylinder 2 rotates within the casing 3 around the axis θ. .

The casing 3 is provided with a suction port 14a and a discharge port 15b that can communicate with the front opening 10 of the pump cylinder 2 at the front part, and a rear opening 11 of the pump cylinder 2 at the rear part.
A suction port 14b and a discharge port 15a are provided which can communicate with the front opening 10 and the suction port 14a, and the rear opening 1.
Pair A of suction low discharge ports in which the discharge ports 1 and 15a communicate with each other.
A pair B of suction and low discharge ports is formed in which the rear opening 11 and the suction port 14b, and the front opening [0] and the discharge port 15b communicate with each other. These two pairs of suction and low discharge ports A and B are arranged at a distance of 180° from each other around the axis of the pump cylinder 2, and are alternately communicated and disconnected by rotating the pump cylinder 2 by 180°. repeated.

Note that an appropriate number of the pairs of suction and low discharge ports can be selected in consideration of the properties of the fluid to be sent, the discharge amount, etc., and the pairs can be arranged at predetermined angular intervals depending on the selected number.

FIGS. 2 and 3 are explanatory diagrams of the operation of this embodiment. In FIG. 2, the pump cylinder 2 is in a position where the rear opening 11 and the suction port 14b and the front opening 10 and the discharge port 15b are in communication with each other, that is, the pair B is in communication and the pair B is in a state of being blocked. . Here, when the piston 1 moves forward, the fluid to be delivered from the front chamber of the pump cylinder 2 is discharged from the discharge port 15b, and at the same time, the fluid to be delivered is sucked into the rear chamber of the pump cylinder 2 from the suction port 14b. When the piston 1 reaches the stroke end, the self-clearing actuator 13 rotates the pump cylinder 2 by 180 degrees. Then, as shown in Figure 3,
The pump cylinder 2 has a front opening 10, a suction port 14a,
The rear opening 11 and the discharge port 15a are in a position where they communicate with each other, that is, the person is in communication and the pair B is in a blocked state. When the piston 1 retreats, the fluid to be delivered in the rear chamber of the pump cylinder 2 is discharged from the discharge port 15a, and at the same time, the fluid to be delivered is sucked into the front chamber of the pump cylinder 2 from the suction port 14a. When the backward stroke is completed, the pump cylinder 2 is rotated 180 degrees again to bring the pair B in FIG. 2 into communication, and this stroke is repeated. Therefore, there is no need for a switching valve, and the fluid to be fed is pumped during both the forward and backward strokes of the piston 1.

〔Effect of the invention〕

In this invention, as described above, the pump cylinder is rotatably supported within the casing, and a plurality of pairs of suction and discharge ports are appropriately arranged in the casing, so that the pump itself has the function of a switching valve, and a separate switching valve is provided. There is no need to provide a valve, and the fluid to be delivered can be discharged during the reciprocating stroke of the piston.
The transport capacity is increased and continuous pumping becomes possible without the need for multiple cylinders. Therefore, the piston pump can be downsized and installed in a narrow space.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a piston pump according to an embodiment of the present invention, and FIGS. 2 and 3 are explanatory views of the operation of the piston pump according to this embodiment. In the figure, 1 is a piston, 2 is a pump cylinder, 3 is a casing, 4 is a piston pump, 5 is a hydraulic cylinder, 10 is a front opening, 11 is a rear opening, 13 is a rotor 'J'
? Mouth: x, x-yu, 1.4a, 14b are inlets, 15
a and 15b are discharge ports, and θ is the axis of the pump cylinder. Patent applicant Furukawa Mining Co., Ltd. Representative Patent attorney Tetsuya Mori Patent attorney Yoshiaki Naito Patent attorney Tadashi Shimizu Representative Patent attorney Nobu Kajiyama Figures 1, 2 and 3

Claims (1)

[Claims] A pump cylinder in which a reciprocating piston is slidably fitted and has openings at the front and rear parts is rotatably supported within a casing, and the casing has an opening at the front part and a suction port of the pump cylinder, and an opening at the rear part of the pump cylinder. A pair of suction low discharge ports in which the opening and the discharge port communicate with each other, a pair of suction low discharge ports in which the rear opening and the suction port communicate with each other, and a pair of suction low discharge ports in which the front opening and the discharge port communicate with each other. Piston pumps are arranged alternately at a predetermined angle.