JPH05126057A - Fluid pump - Google Patents

Abstract

PURPOSE:To provide a fluid pump which has less frictional sections, and is high in durability while being capable of producing high discharge pressure. CONSTITUTION:A drive shaft 8 rotatably driven by an external power source is provided at the center of a cylindrical cylinder 9, an eccentric disc 11 is fixedly provided for the drive shaft 8, and a ring shaped rocking piston 12 is rotatably and outerly coupled with the outer circumference of the eccentric disc 11. Parallel cut-jut faces 13a and 13b are formed on the sections mutually opposite over the outer circumference of the ring shaped rocking piston 12, and paired movable partitioning walls 14a and 14b the inner end faces of which slidably come in contact with the out-out faces 13a and 13b, are concurrently disposed at the circumferential surface of the cylindrical cylinder 9 in such a way as to be freely advanced/retreated. The movable partitioning walls 14a and 14b are integrally connected to each other at the outside of the cylindrical cylinder 9. Furthermore, inflow ports 18a and 18b and outflow ports 19a and 19b are opened so as to be provided in the positions close to the movable partitioning walls 14a and 14b of variable volume chambers 17a and 17b which are formed when the outer circumference of the ring shaped rocking piston 12 is inscribed in the cylindrical cylinder 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pump for pumping an incompressible or compressible fluid such as liquid or gas.

[0002]

2. Description of the Related Art Generally, fluid pumps are roughly classified into positive displacement pumps and non-positive displacement pumps. Among them, positive displacement pumps have an advantage that a fluid delivery pressure can be set high like a vane type pump.

[0003]

However, in the vane type pump, the tip of the rotary vane is easily worn due to sliding contact with the inner circumference of the cylinder. Sex is a problem.

[0004]

SUMMARY OF THE INVENTION A fluid pump of the present invention is intended to solve the above-mentioned problems, in which a drive shaft which is rotationally driven by an external power source is provided at the center of a cylindrical cylinder, and the drive shaft is provided with an eccentric disk. A ring-shaped oscillating piston is fitted on the outer circumference of the eccentric disc so as to be freely rotatable, and a notch surface is formed parallel to the opposite portion of the outer circumference of the ring-shaped oscillating piston, and the inner end surface is formed. A pair of movable partition walls slidably contacting the notched surface are arranged to be movable back and forth on the peripheral wall of the cylindrical cylinder, and the movable partition walls are integrally connected to each other outside the cylindrical cylinder, and further, of the ring-shaped swing piston. It is characterized in that an inflow port and an outflow port are respectively provided at portions of the variable volume chamber, which are formed by inscribing the outer periphery of the cylindrical cylinder, in proximity to the movable partition wall.

[0005]

Since the ring-shaped oscillating piston is inscribed so as to substantially roll around the inner circumference of the cylindrical cylinder, friction is reduced, smooth operation is obtained, and wear is reduced and durability is high.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a horizontally long cylindrical casing integrally formed with a mounting base 2 on the bottom, and side plates 4 and 5 are fixed to both end surfaces of the casing 1 by bolts 3, 3 ,.

Roller bearings 6 and 7 are provided on the side plates 4 and 5, respectively, and a drive shaft 8 is rotatably supported by the roller bearings 6 and 7.

Reference numeral 9 indicates a bolt 10 at the center of the casing 1,
A cylindrical cylinder having both end surfaces abutted against and fixed to the side plates 4 and 5 by 10 ..., The drive shaft 8 is pivotally supported at the center of the cylindrical cylinder 9. One end of the drive shaft 8 is connected to an external power source such as a motor, and the drive shaft 8 is rotationally driven.

Reference numeral 11 denotes an eccentric disc fixed to the drive shaft 8 in an eccentric manner. A ring-shaped rocking piston 12 is externally fitted to the outer circumference of the eccentric disk 11 so as to be rotatable.

The ring-shaped oscillating piston 12 is formed with cutout surfaces 13a and 13b which are parallel to each other at opposite portions of the outer circumference.

The inner end surfaces of 14a and 14b are the cutout surfaces 13.
The movable partition walls 14a and 14b are slidably in contact with a and 13b. The movable partition walls 14a and 14b are integrally formed on the inner circumference of an annular connecting piece 16 formed so as to surround the outer circumference of the cylindrical cylinder 9 with a sufficient clearance so that they can be integrally connected to each other and move integrally. It has become.

The ring-shaped oscillating piston 12 is an eccentric disk 11
In order to move in the eccentric direction, the outer periphery of the ring-shaped oscillating piston 12 is inscribed in the cylindrical cylinder 9, whereby variable volume chambers 17a and 17b are formed between the ring-shaped oscillating piston 12 and the cylindrical cylinder 9.

Reference numeral 18a denotes an inflow port formed in the inner surface of the cylindrical cylinder 9 so as to open in one of the variable volume chambers 17a at a position close to the movable partition wall 14a, and 19a denotes the other of the variable volume chambers 17a. An outflow port opened on the inner surface of the cylindrical cylinder 9 so as to open at a position close to the movable partition wall 14b. Similarly, the outflow passages 21a, which communicate with the outside through the side plates 4, are also provided.

Further, 18b is an inflow port formed on the inner surface of the cylindrical cylinder 9 so as to open in the other variable volume chamber 17b at a position close to the movable partition wall 14b, and 19b.
Is an outflow port opened on the inner surface of the cylindrical cylinder 9 so as to open at a site close to the other movable partition wall 14a of the variable volume chamber 17b. Outflow paths 21b are respectively extended to the outlets 19b.

In the fluid pump constructed as described above, the ring-shaped oscillating piston 12 is sandwiched between the movable partition walls 14a and 14b and cannot rotate, so that the drive shaft 8 and the eccentric disk 11 rotate in the direction of the arrow. By doing so, the ring-shaped oscillating piston 12 oscillates within the cylindrical cylinder 9 while moving an inscribed position with the cylindrical cylinder 9. Therefore, the volumes of the variable volume chambers 17a and 17b change.

As illustrated in FIG. 4, the fluctuating volume chamber 17a is divided into two parts at the inner contact point t, and the space 17a 'in the traveling direction of the inner contact point t becomes gradually narrower, so that the fluid in the space flows out. Since the space 17a ″ behind the inner contact point t is gradually widened as it is pushed out to the inlet 19a.
The fluid is sucked into the space from a. Therefore, the inlet 18
The fluid sucked from a is sent under pressure to the outlet 19a.

In the same operation, the inner contact t has a variable volume chamber 17b.
The fluid that is generated when the fluid is moved to and is sucked from the inflow port 18b is pumped to the outflow port 19b.

[0018]

As described above, in the fluid pump of the present invention, the ring-shaped oscillating piston that is inscribed in the cylindrical cylinder is allowed to rotate substantially without rotating, and the inscribed position is moved to form the variable volume chamber. As a result, the friction of the inscribed portion is less than that of the positive displacement pump as exemplified by the conventional vane type pump, and the one with less wear and higher durability can be obtained. Moreover, there is a beneficial effect that a high delivery pressure can be obtained by expanding and contracting the variable volume chamber.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a fluid pump of the present invention.

FIG. 2 is a vertical cross-sectional view of FIG.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is an operation state diagram of FIG. 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 4,5 Side plate 6,7 Roller bearing 8 Drive shaft 9 Cylindrical cylinder 11 Eccentric disk 12 Ring-shaped oscillating piston 13a, 13b Notch surface 14a, 14b Movable partition wall 15a, 15b Wall hole 16 Annular coupling piece 17a, 17b Variable volume chamber 18a, 18b Inlet port 19a, 19b Outlet port

Claims (1)

[Claims] 1. A drive shaft, which is driven to rotate by an external power source, is provided at the center of a cylindrical cylinder, an eccentric disc is fixedly mounted on the drive shaft, and a ring-shaped swing is rotatably provided on the outer periphery of the eccentric disc. The piston is externally fitted to form a cutout surface parallel to the opposing portion of the outer circumference of the ring-shaped swing piston,
A pair of movable partition walls whose inner end surfaces are in sliding contact with the cutout surfaces are arranged so as to be able to move forward and backward with respect to the peripheral wall of the cylindrical cylinder, and the movable partition walls are integrally connected to each other outside the cylindrical cylinder, and further ring-shaped swinging. A fluid pump, characterized in that an inflow port and an outflow port are opened at a portion of the variable volume chamber, which is formed by the outer circumference of the piston being inscribed in the cylindrical cylinder, in the vicinity of the movable partition wall.