JP2000297767A - Rotary fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seal the seal body for partitioning an operation chamber which can move smoothly with a small friction resistance simply and surely. SOLUTION: A suction port 3, delivery port 4 and circular operation chamber 5 for communicating therewith are formed in a casing 2. An off-centered rotor 6 having the axial center 6a off-centered from the inner periphery surface 5A center is provided in this operation chamber 5 and plural radial grooves 7 passing the off-centered axial center 6a at some intervals in the periphery direction are formed in this off-centered rotor 6 and a seal rolling body 8 rolling while internally touching with the operation chamber inner periphery surface 5A is provided in this respective radial grooves 7 and a center circular body 9 contacting with the entire seal rolling body 8 concentrically with the operation chamber inner periphery surface 5A is provided in the off-centered rotor 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pump, a motor,
The present invention relates to a rotary fluid machine such as a blower that converts rotational energy into fluid energy such as gas or liquid.

[0002]

2. Description of the Related Art A vane compressor is known as a rotary fluid machine having a circular working chamber. In this vane type compressor, an eccentric rotor is eccentrically arranged in a working chamber of a casing, and a large number of blades are radially fitted and movable in the eccentric rotor, and the blades are operated by a centrifugal force or a spring force of rotation. It is configured to slide in contact with the inner peripheral surface of the chamber and to pump the fluid by a volume change according to the degree of eccentricity of the working chamber separated by the eccentric rotor, the casing, and the blade.

[0003]

In the above-mentioned prior art, the blades are brought into sliding contact with the peripheral surface of the working chamber of the casing, and the side surfaces are brought into sliding contact with the eccentric rotor by radial movement with the rotation of the eccentric rotor. Therefore, the frictional resistance is always large, which may hinder the movement of the blades or cause seizure.In addition, it is difficult to seal the tip of the blades, and special sealing means are required, and the structure is complicated. Has become. SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary fluid machine capable of solving the problems of the related art.

According to the present invention, a plurality of radial grooves in an eccentric rotor are provided with a seal rolling element that rolls in contact with the peripheral surface of the working chamber, and a center circular body that comes into contact with all the seal rolling elements is provided. An object of the present invention is to provide a rotary fluid machine in which a rolling element has a small frictional resistance, can move smoothly, and can easily and reliably seal.

[0005]

The first concrete means for solving the problem in the present invention is that a casing 2 has an inlet 3
And an outlet port 4 and a circular working chamber 5 communicating therewith, and an eccentric rotor 6 having an axis 6a eccentric from the center of the inner peripheral surface 5A is provided in the working chamber 5; A plurality of radial grooves 7 are formed at equal intervals in the circumferential direction and pass through the eccentric shaft core 6a, and a seal rolling element 8 that inscribes with the peripheral surface 5A of the working chamber is provided in each of the radial grooves 7. A central circular body 9 is provided in the rotor 6 so as to be concentric with the peripheral surface 5A of the working chamber and in contact with the entire seal rolling element 8.

As a result, when the eccentric rotor 6 rotates, the seal rolling element 8 revolves while rotating on the peripheral surface 5A of the working chamber, and the casing 2 and the eccentric rotor 6 rotate.
The working chamber 5 divided by the two seal rolling elements 8 is changed to a volume corresponding to the degree of eccentricity, and the fluid sucked from the suction port 3 is pumped to the discharge port 4 side. The all-sealing rolling elements 8 roll with the center circular body 9 at the same time as rolling with the peripheral surface 5A of the working chamber. The relationship is universal and the eccentric rotor 6
Slidably contacts the wall surface of the radiation groove 7 in line contact and reciprocates in the radial direction from the eccentric shaft core 6a side.

A second concrete means for solving the problem in the present invention is that, in addition to the first concrete means, at least the seal rolling element 8 of the seal rolling element 8 and the central circular body 9 is used.
Is formed of a cylindrical body. This makes it possible to manufacture at least the seal rolling element 8 of the seal rolling element 8 and the central circular body 9 at a low weight and at a low cost. The third specific means for solving the problem in the present invention is the first or second means.
In addition to the specific means described above, two, three or four radiation grooves 7 are formed, and the center circular body 9 is formed to have substantially the same diameter as the seal rolling element 8.

As a result, the seal rolling element 8 and the center circular body 9 can be formed to have substantially the same diameter, the rolling contact with the center circular body 9 smoothly, the frictional resistance is small, and the cost is low. Can be manufactured.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIGS. 1 and 2, a rotary fluid machine 1 </ b> A is mainly used as a hydraulic pump or a hydraulic motor, and a casing 2 can be installed by an installation table 12. I have. The casing 2 forms a working chamber 5 having a circular inner peripheral surface 5 </ b> A in a substantially circular casing main body 2 </ b> A, forms a suction port 3 and a discharge port 4 communicating with the working chamber 5, and operates with a lid 13. Room 5 is closed. The lid 13 is bolted to the mounting base 2 together with the casing body 2A.

An eccentric rotor 6 is rotatably arranged in the working chamber 5, and the eccentric rotor 6 has an inner peripheral surface 5A.
Having an eccentric shaft center 6a eccentric by a distance L from the center P of
Further, the diameter is smaller than the inner diameter of the inner peripheral surface 5A by twice the distance L. The rotor shaft 6A of the eccentric rotor 6 is positioned concentrically with the eccentric shaft core 6a, is rotatably supported by the casing body 2A via a bearing 14, and is connected to an external drive source such as an electric motor. Reference numeral 15 denotes a shaft seal. The eccentric rotor 6 has a cross-shaped diametric groove passing through the eccentric shaft core 6a on one side surface of the circular body, that is, four radiating grooves radiating from the eccentric shaft core 6a to the outer peripheral surface and equally spaced in the circumferential direction. A seal rolling element 8 is arranged in each of the radial grooves 7, and a central circular body 9 is arranged at the center of the four seal rolling elements 8.

All the rolling elements 8 have the same outer diameter and are cylindrical,
For example, it is formed by cutting a pipe material, and is in contact with the inner peripheral surface 5A of the working chamber 5 so as to be rollable.
Even if the seal rolling element 8 is a cylindrical body, its axial end face is in sliding contact with the casing body 2A and the lid 13, so that no fluid flows into the cylindrical body, but the end face is closed. You may keep it. The center circular body 9 is a metal cylindrical body or a circular body having substantially the same outer diameter as the seal rolling element 8.
By rollingly contacting the seal rolling elements 8 at the same time, the seal rolling elements 8 are located at the center of all the seal rolling elements 8, and the axis thereof is located at the center P of the inner peripheral surface.

That is, the sum of the diameters of the two seal rolling elements 8 and one central circular body 9 located in the diameter direction is equal to the inner peripheral surface 5A.
The four seal rolling elements 8 are guided by the radial grooves 7 and are movable only in the radial direction (radial direction) of the eccentric rotor 6. Face 5
The eccentric rotor 6 does not move in the radial direction because it coincides with the center P of A, and the eccentric rotor 6 only rotates around the eccentric shaft core 6a. When the eccentric rotor 6 is rotated clockwise in FIG. 1 in the rotary fluid machine 1A, the four seal rolling elements 8
Is pressed around while contacting the groove wall, and revolves around the center circular body 9, and the seal rolling body 8 rolls and rolls while being in contact with the inner peripheral surface 5 </ b> A due to contact with the inner peripheral surface 5 </ b> A. The center circular body 9 is rotated while being in rolling contact by being in contact with the circular body 9.

Since the four seal rolling elements 8 have the same rotation direction and the same rotating direction of the center circular body 9, the sealing rolling bodies 8 are in rolling contact with both the inner peripheral surface 5A and the center circular body 9. And the entire seal rolling element 8 is a central circular body 9
And the frictional resistance with the inner peripheral surface 5A is extremely small, and only the contact of the eccentric rotor 6 with the radiation groove 7 comes into sliding contact. The arc-shaped working chamber 5 formed between the inner peripheral surface 5A and the eccentric rotor 6 is divided by two seal rolling elements 8, and one seal rolling element 8 is positioned closest to the eccentric shaft core 6a. While moving through the suction port 3 to the farthest position from the inner peripheral surface 5A.
While the eccentricity increases and the volume increases and changes, the fluid is sucked from the suction port 3, and while the seal rolling element 8 moves from the position farthest to the eccentric shaft core 6 a through the discharge port 4, the partition The eccentricity gradually decreases and the volume of the inner peripheral surface 5 </ b> A decreases, and the fluid is pumped from the discharge port 4.

In such a rotary type fluid machine 1A, the seal between the inner peripheral surface 5A and the seal rolling element 8 is formed by the seal rolling element 8A.
, Which eliminates sliding contact, improves durability, can operate evenly from low-speed rotation to high-speed rotation, can control the supply flow rate by the number of rotations, and structurally generates vibration even at high-speed rotation. Very low. In addition, at least one of the seal rolling element 8 and the center circular body 9 is formed in a cylindrical shape with thin-walled spring steel or the like, or an outer peripheral surface thereof is coated with an elastic material so as to have elasticity. It is preferable that the seal rolling element 8 is configured to be able to be pressed against the inner peripheral surface 5A.

In FIG. 1, reference numeral 16 denotes a suction hose connected to the suction port 3, and 17 denotes a discharge hose connected to the discharge port 4, both of which may be metal pipes. 3 and 4 show a second embodiment, in which a rotary fluid machine 1B is used as a rotary metering pump or the like.
2, a casing body 2A of the casing 2 is bolted, and a lid 13 is bolted to the casing body 2A. The eccentric rotor 6 has an eccentric shaft core 6a on one side of a circular body.
The radial grooves passing through are deflected by 120 degrees, that is, 3 radially and circumferentially equally spaced from the eccentric shaft core 6a to the outer peripheral surface.
A plurality of radiation grooves 7 are formed, a seal rolling element 8 is disposed in each of the radiation grooves 7, and a central circular body 9 is disposed at the center of the three seal rolling elements 8. The eccentric rotor 6
Has a structure in which an output shaft of a drive source such as an electric motor is inserted and connected.

The all-sealing rolling elements 8 and the central circular body 9 are formed of a cylindrical body having the same outer diameter and are in rolling contact with each other so that they are in rolling contact with each other.
And is in contact with the inner peripheral surface 5A so that it can roll. In the second embodiment, as in the first embodiment, when the eccentric rotor 6 is rotated clockwise in FIG. 1, the three seal rolling elements 8 are pushed while being in line contact with the groove walls of the radiation grooves 7. Around the center circular body 9, and the seal rolling element 8
By contacting with A, it rolls itself while rolling, and by contacting with the center circular body 9, rotates the center circular body 9 while rolling.

FIG. 5 shows a third embodiment, in which a rotary fluid machine 1C is mainly used as a blower, and a hole 18 is formed in a land portion between the radial grooves 7 of the eccentric rotor 6. Then, air guides 19 and 20 communicating with the suction port 3 and the discharge port 4, respectively, are formed on the inner peripheral surface 5A of the working chamber 5, and the seal rolling element 8 and the central circular body 9 are formed by thin pipes. I have. The number of the arranged seal rolling elements 8, that is, the number of radiation grooves 7 that can be formed in the eccentric rotor 6 can be two or five in addition to three or four as in the first to third embodiments. Within this range, the seal rolling element 8 and the central circular body 9 can be formed to have substantially the same diameter by sufficiently securing the land between the radiation grooves 7.

When the number of the radiation grooves 7 is six or more, as shown in a fourth embodiment of FIG. 6, the width of the radiation grooves 7 is narrowed to make the diameter of the seal rolling element 8 small, and the land portion is sufficiently provided. In this case, the center circular body 9 has a larger diameter than the seal rolling element 8. The minimum diameter of the seal rolling element 8 is determined by the relationship with the eccentric dimension L, and the amount of protrusion of the seal rolling element 8 from the radiation groove 7 must be smaller than approximately half. When the amount of protrusion of the seal rolling element 8 becomes substantially half or more, the radiation groove 7
This is because a gap is formed between the groove wall and the groove wall.

The rotary fluid machine 1D according to the fourth embodiment.
Since the center circular body 9 has a large diameter, the shaft 6B of the eccentric rotor 6 can penetrate the inside thereof, and the rotary type fluid machine 1D is connected to two or three stations to be driven by one drive source. It becomes possible to drive a plurality of rotary fluid machines. Note that the present invention is not limited to the above embodiment, and can be variously modified. For example, the casing 2, the eccentric rotor 6, the seal rolling element 8, and the center circular body 9
The metal material is appropriately set according to the fluid to be used, the required accuracy and pressure, and the like, and a non-metallic material such as a synthetic resin is used. Further, the radiation groove 7 is a groove having one open surface, but may be formed as a hole having a square cross section.

[0020]

According to the present invention described in detail above, the shaft center 6 eccentric from the center of the inner peripheral surface 5A is provided in the working chamber 5 of the casing 2.
a eccentric rotor 6 having an inner peripheral surface 5A is provided in a plurality of radial grooves 7 of the eccentric rotor 6, and a seal rolling member 8 is provided which is concentric with the inner peripheral surface 5A and is entirely sealed. Since the center circular body 9 that contacts the rolling element 8 is provided, the frictional resistance of the sealing rolling element 8 can be small and can move smoothly, and the seal between the two can be easily and reliably performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional side view of the same part.

FIG. 3 is a cross-sectional view illustrating a second embodiment.

FIG. 4 is a sectional side view of the same part.

FIG. 5 is a sectional view showing a third embodiment.

FIG. 6 is a sectional view showing a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary fluid machine 2 Casing 3 Inlet 4 Discharge port 5 Working chamber 5A Inner peripheral surface 6 Eccentric rotor 6A Rotor shaft 6a Eccentric shaft core 7 Radiation groove 8 Seal rolling element 9 Central circular body

Claims (3)

[Claims] An eccentric rotor having an axial center eccentric from the center of an inner peripheral surface is provided in a casing, and a suction port and a discharge port and a circular working chamber communicating with them are formed in a casing. A plurality of radial grooves are formed at equal intervals in the circumferential direction and passing through the eccentric shaft core, and a seal rolling element that inscribes with the peripheral surface of the working chamber is provided in each of the radial grooves, so that the radially acting grooves are formed in the eccentric rotor. A rotary fluid machine having a central circular body that is concentric with the inner peripheral surface and abuts on all the rolling elements of the seal. 2. The rotary fluid machine according to claim 1, wherein at least one of the seal rolling element and the central circular body is formed of a cylindrical body. 3. The rotary fluid according to claim 1, wherein two, three or four radiation grooves are formed, and a center circular body is formed to have substantially the same diameter as a seal rolling element. machine.