JP2006170175A - Rotary pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small size and lightweight fluid pump capable of being practically used from a low rotation speed to a high rotation speed and good in energy efficiency. <P>SOLUTION: A rotation cylinder 2 having a perfect circle outer circumference surface 17, a double head piston 3, and a drive shaft 1 having an eccentric shaft are combined in a casing 4 having a perfect circle inner circumference surface 16, a drive shaft gear 1b and a cylinder inner gear 2a are meshed and volume of a space part 27 formed between the piston 3, the cylinder 2 and the casing 4 is expanded and contracted by rotating a drive shaft. This rotary pump performs suction and delivery through a suction port 22 and a delivery port 21 leading to the outer circumference from the inner circumference surface 16 of the casing 4 by change of the volume. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluid machine that performs suction, compression, and discharge of fluid such as gas and liquid by rotation.

  With the development of science, various pumps, which are fluid machines, have been developed and their performance has been improved. Rotary small pumps include rotary pumps with gate valves and scroll pumps.

These rotary fluid pumps have a spring repulsion resistance every rotation in addition to the energy consumed for suction, compression, and discharge, resulting in a large energy loss, which is not suitable for the energy saving era. Further, since the rotation mechanism is accompanied by a spring, there is a limit to downsizing such as being unsuitable for high-speed rotation while being a rotary type.
To solve these problems, it was necessary to reduce energy consumption, high speed rotation, and miniaturization.

  The present invention is intended to provide an efficient rotary fluid pump that structurally eliminates these disadvantages.

Action

When the drive shaft rotates twice, the internal gear of the cylinder meshing with the drive shaft gear rotates once. At that time, the pistons of the two heads fitted on the eccentric shaft portion of the drive shaft reciprocate one relative to the cylinder. The space between the cylinder, the piston, and the casing inner peripheral surface expands and contracts by the reciprocating motion. When the cylinder rotates once through the suction port and the discharge port from the outside of the casing due to the expansion and contraction of the space, the suction and discharge are performed twice, while the piston rotates around the eccentric shaft portion of the drive shaft. Revolving, the drive shaft and cylinder rotate around their bearings.
Therefore, this rotary pump has no reciprocating part and no necessary part of the spring, so there is no energy loss due to them, and it can be miniaturized because it can rotate at high speed.

The invention's effect

When the drive shaft of this rotary pump having the above structure is driven once by the power unit, the cylinder rotates 180 degrees, and the piston rotates 180 degrees accordingly, and suction and discharge are performed once each. Since there is a large space between them, the amount of discharge is large, and all parts of the structure are circular motions and there are no springs, so there is no energy loss due to reciprocal motion and spring repulsion resistance.
Further, since all of them are circular motions and can be rotated at high speed, they have many economical features such as miniaturization and are excellent in industrial use.

  A cylindrical cylinder with a perfect circular outer peripheral surface has a hole for reciprocating sliding of the piston from the outer peripheral direction, a bearing is provided at the center of both side surfaces, and an internal gear is provided at the same center as the bearing. In the cylinder, there is a double-headed piston that is fitted with the eccentric shaft part of the drive shaft at the center and a hole that can be rotated, and an eccentric shaft part that fits into the piston hole, and the amount of eccentricity is the pitch circle of the cylinder internal gear. A rotating body combined with a drive shaft having a diameter of ¼ and a gear meshing with the internal gear of the cylinder outside the eccentric shaft portion, the number of teeth of which is ½ of the internal gear, Is installed in a cylinder with a perfect circle, and the rotation center of the drive shaft and the rotation center of the cylinder are set to 1/4 the pitch circle diameter of the internal gear, and the drive shaft bearing is located outside the center of the cylinder rotation bearing. Cylinder rotation center and case Suction by rotating the embedded drive shaft within the casing in both side plates obtained by processing so as to be concentric with the center of the ring in the circumference, and performs discharge.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a front view of the entire rotary pump with a part broken away, FIG. 2 is a sectional view taken along the line KK in FIG. 1, and FIG. 3 is a sectional view taken along the line GG in FIG.
FIG. 4 shows an embodiment in which the cylindrical shape of the piston 3 in FIG. 1 has a rectangular cross-sectional shape, and is structurally the same as in FIG. 1, and air-tight grooves 9a, 10a, 11a are used instead of the seals 9, 10, 11. FIG. 2 is a front view of a partly broken view with three inlets 22 and three outlets 21.
5 is a cross-sectional view taken along the line KK in FIG. 4, and FIG. 6 is a cross-sectional view taken along the line GG in FIG.
FIG. 7 is an explanatory view showing the rotation of the cylinder 2, the rotation of the piston 3, and the reciprocating motion.

The mechanism of the rotation of the cylinder 2, the rotation of the drive shaft 1, and the rotation and reciprocation of the piston 3 will be described with reference to the drawings.
In FIG. 7, a circle L is a pitch circle of the internal gear 2a of the cylinder, a circle S is a pitch circle of the gear 1b of the drive shaft 1 and a rotation circle at the center point of the eccentric shaft portion 1a, and its diameter is 1 of the circle L. / 2. Point O is a base point, point C is a rotation center point of the gear 1b and the eccentric shaft portion 1a of the drive shaft, and a line AC is a radius of each.
Point D is the rotation center of the internal gear 2 a of the cylinder 2, and line BDE is the center line of the internal gear 2 a and the center line of the piston 3. First, when the circle S is rotated by a certain angle by the rotation of the drive shaft, the circle L meshing with the circle S rotates around the point D by ½ of the rotation angle of the circle S.
When the point A rotates 180 degrees on the circle S from the base point O to the point D, the straight line BDE rotated at half the rotation angle always passes through the point A and rotates 90 degrees. Similarly, when the point A returns from the point D to the base point O by 180 degrees on the circle S, the point E of the straight line BADE rotates 90 degrees to the base point O.

When the straight line BADE rotates in this way, the length of the straight line BA changes, and when the point A reaches the point D, it becomes equal to the radius of the circle L, and then when the point A rotates to the point O, the point of the straight line BADE E reaches the point O, and the length between the straight lines BA becomes the maximum and becomes the diameter of the circle L.
The change in the length between the BAs is the change in the stroke of the piston 3 that reciprocates with respect to the cylinder 2, and the maximum value of the stroke is equal to the diameter of the circle L.

Effect of the embodiment

  Cylinder shafts 25 and 26 are provided in the center of both side surfaces of a cylindrical cylinder 2 having a perfect circular outer peripheral surface 17, and an internal gear 2a integrated with the cylinder 2 is provided on the inner side of the shaft, so that the piston 3 extends from the outer peripheral direction. The cylinder 2 that has passed through the sliding hole 2b through the cylinder rotation center D, the double-headed piston 3 that is provided with a hole that rotatably fits the eccentric shaft 1a at the center, and the eccentric amount that fits into the piston hole An eccentric shaft portion 1a that is ¼ of the pitch circle diameter of the internal gear 2a and a drive shaft that is provided with a drive shaft gear 1b that meshes with the internal gear 2a on the outside thereof and that has half the number of teeth of the internal gear 2a. An assembling rotating body is formed in a cylindrical casing 4 having a suction port 22 and a discharge port 21 on the outer periphery and an inner peripheral surface 16 forming a perfect circle, and a rotation center D of the cylinder 2 and a rotation center C of the drive shaft 1. Cylinder is between shafts Bearings 7 and 8 having drive shaft bearings 14 and 15 and cylinder bearing portions 12 and 13 that are 1/4 of the pitch circle diameter of the internal gear 2a, that is, 1/2 of the pitch circle diameter of the drive shaft gear 1b, and side plates 5 and 6 form a built-in rotary pump.

Embodiment 1.2.3 In the figure, a cylindrical piston 2b is provided with a piston seal 9 for preventing pressure leakage, and cylinder seals 10 and 11 are provided on the outer peripheral surface 17 of the cylinder 2 to prevent pressure leakage.
The casing 4 has an inflow groove 24 and an outflow groove 23 on the inner peripheral surface 16, an inlet 22 and an outlet 21 on the outer periphery, and is provided with side plate fastening screw holes.
Both side plates 5 and 6 are provided with holes through which screws 18 to be fastened to the casing are passed in the outer peripheral portion, and have holes into which the bearings 7 and 8 are assembled at the center, and the bearings 7 and 8 are assembled by bearing fastening screws 19 and 20 around the holes. Attached.
The bearings 7 and 8 have bearing parts 14 and 15 and cylinder bearing parts 12 and 13 through which the drive shaft 1 penetrates, and their center size is ½ of the pitch circle diameter of the drive shaft gear 1b.
When the drive shaft 1 rotates, a balance weight 27 is provided outside the bearing 8 in order to eliminate the unbalance caused by the revolution of the eccentric shaft portion 1a of the drive shaft and the piston. You may make it balance by making it a structure.

  4, 5 and 6, the cross-sectional shape of the piston 3 is changed from a cylindrical shape to a rectangular shape, an airtight groove 9 a for keeping airtightness is provided on the side surface, and the piston sliding hole 2 b of the cylinder 2 is also made rectangular and airtight on the outer peripheral surface of the cylinder. Air-tight grooves 10a and 11a are provided to maintain the flow rate, and there are no inflow and outflow grooves on the inner peripheral surface of the casing, and a plurality of discharge ports 21 and suction ports 22 are provided.

  Industrial fluid machinery

  The front view which fractured | ruptured 1 part of this invention Example   KK sectional view of the present invention shown in FIG.   GG sectional view of the present invention shown in FIG.   The front view which fractured | ruptured one part of the Example which changed the piston of this invention, the suction / discharge port seal, etc.   KK sectional view of the present invention shown in FIG.   GG sectional view of the present invention shown in FIG.   Explanatory drawing which shows the related movement of the drive shaft of this invention Example, piston, and a cylinder

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive shaft 1a Eccentric shaft part 1b Drive shaft gear 2 Cylinder 2a Cylinder internal gear 2b Piston sliding hole 3 Piston 4 Casing 5 Side plate 6 Side plate 7 Bearing 8 Bearing 9 Piston seal 9a Piston airtight groove 10 Cylinder seal 10a Cylinder airtight groove 11 Cylinder Seal 11a Cylinder airtight groove 12 Cylinder bearing part 13 Cylinder bearing part 14 Drive shaft bearing part 15 Drive shaft bearing part 16 Casing inner peripheral surface 17 Cylinder outer peripheral surface 18 Side plate fastening screw 19 Bearing fastening screw 20 Bearing fastening screw 21 Discharge port 22 Suction port 23 Outflow groove 24 Inflow groove 25 Cylinder shaft 26 Cylinder shaft 27 Space portion 28 Balance weight C Drive shaft rotation center D Cylinder rotation center circle S Rotation circle at the center of the eccentric shaft portion and pitch circle L of the drive shaft gear L Pitch circle O point Base point A point Eccentric shaft center point B point Internal gear pitch circle base point C Circle S center point D point Circle L center point E point Internal gear pitch circle base point

Claims (3)

  Bearings are provided at the center of both sides of a cylindrical cylinder with a perfect circular outer peripheral surface so that it can rotate, and an internal gear with the same center as the bearing is provided inside the bearing, passing through a hole where the piston slides from the outer peripheral direction. Cylinder, a double-headed piston with a hole that fits rotatably with the eccentric shaft part in the center, and an eccentric shaft that fits into the piston hole. The amount of eccentricity is 1/4 the pitch circle diameter of the internal gear of the cylinder. The assembly rotating body with the drive shaft provided with a gear which meshes with the internal gear of the cylinder outside the eccentric shaft portion and whose number of teeth is 1/2 that of the cylinder internal gear, from the inner peripheral surface to the outer peripheral portion. The internal gear of the cylinder and the drive shaft gear are meshed in a cylindrical casing having a suction port and a discharge port leading to the inside, and the inner peripheral surface forms a perfect circle, and the rotation center of the drive shaft is offset outward from the rotation center of the cylinder. Mind that axis Cylinder bearings and drive shaft bearings are provided on both side plates so that the oversize is 1/4 of the pitch circle diameter of the cylinder internal gear, and the casings on both side plates so that the inner circumference of the casing and the center of the cylinder bearings are concentric. A rotary pump with a lid inside.   The rotary pump according to claim 1, wherein seals that slide in close contact with the inner peripheral surface of the casing on the outer peripheral surface of the cylinder are provided in one or a plurality of rows parallel and perpendicular to the circumferential direction.   2. The cylinder outer peripheral surface is provided with one or more rows of airtight grooves parallel and perpendicular to the circumferential direction, and the airtight grooves are provided with one or more rows on the sliding surface of the piston having a quadrilateral cross section. Rotary pump.

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