FORCED COMPRESSION TYPE PUMP

POMPE A COMPRESSION FORCEE

English Abstract

1. A forced compression type pump including a cylindrically shaped pump case, an
eccentric rotating body shaft-supported on said pump case at an eccentric position
relative to said pump case and a compressing and forcibly sending member
movable in a radial direction or said eccentric rotating body and adapted to be
brought into press contact with the interior wall of said pump case, characterized in
that the interior space is formed at the central part of said eccentric rotating body,
a plurality of guide grooves are formed in a radial direction from said interior space
to the circumferential surface of said eccentric rotating body, a plurality of
circumferentially contacting cylindrical body inserted in said guide grooves and
movable freely in a radial direction are formed, said plurality of circumferential
contacting cylindrical body are in a planetary relationship relative to said central
cylindrical body and the outer circumferential surfaces of said circumferentially
contacting bodies are brought into press contact with the interior wall of said pump
case while the circumferential surfaces of said circumferentially contacting bodies
on their center sides are brought into press contact with said central cylindrical
body, whereby said circumferentially contacting bodies are made to act as
compressing and forcibly sending members.

Claims

What is claimed is.
CLAIM
1. A forced compression type pump including a cylindrically shaped pump case, an
eccentric rotating body shaft-supported on said pump case at an eccentric position
relative to said pump case and a compressing and forcibly sending member
movable in a radial direction or said eccentric rotating body and adapted to be
brought into press contact with the interior wall of said pump case, characterized in
that the interior space is formed at the central part of said eccentric rotating body,
a plurality of guide grooves are formed in a radial direction from said interior space
to the circumferential surface of said eccentric rotating body, a plurality of
circumferentially contacting cylindrical body inserted in said guide grooves and
movable freely in a radial direction are formed, said plurality of circumferential
contacting cylindrical body are in a planetary relationship relative to said central
cylindrical body and the outer circumferential surfaces of said circumferentially
contacting bodies are brought into press contact with the interior wall of said pump
case while the circumferential surfaces of said circumferentially contacting bodies
on their center sides are brought into press contact with said central cylindrical
body, whereby said circumferentially contacting bodies are made to act as
compressing and forcibly sending members.
2. The forced compression type pump as defined in claim 1, wherein the surface of
the interior wall which makes contact at least with the circumferentially contacting
cylindrical body is made of elastic member.
3. The forced compression type pump as defined in Claim 1, wherein the
circumferentially contacting cylindrical body is made of elastic member.
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4 The forced compression type pump as defined in Claim 1, wherein the
circumferentially contacting cylindrical body is in cylindrically shaped and is
elastically deformable.
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Description

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SPECIFICATION
Title of the invention
Forced compression type pump
Field of the invention
This invention relates to a forced compression type pump including a
cylindrically shaped pump case, an eccentric rotating body and a compressing and a
colllp-~sshlg and forcibly sending member which press contacts with the interior wall of
said pump case.
Background of the invention
As a forced compression type pump of this kind, "liquid and gas forced
compression type pump" (Japanese Utility Model Application Publication Gazette
No.55-184542) has been known.
Referring to Fig. 4, the above forced compression type pump includes a
cylindrically shaped pump case A. an eccentric rotating body B sha~-supported on said
pump case A at an eccentric position thereof and a compressing and forcibly sending
member C which is movable in a radial direction of said eccentric rotating body B and is
adapted to be brought into press contact with the interior wall of said pump case A,
wherein said compressing and forcibly sending member C is composed of a rod-like roller
10 which is movable in a radial direction of said eccentric rotating body B and the volume
of a forcibly sending member Q is reduced gradually from the inlet side 1 toward the outlet
side ~ by rotation of said eccentric rotating body B so as to forcibly send gas or liquid.
In the above forced compression type pump which has already known~ the
difference in speed between the roller 10 and the roller support body 11 is big and

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accordingly the problem of much abrasion is involved
Summar~ of the invention
In the present invention, an interior space is formed at the central position of an
eccentric rotating body, a plurality of guide grooves ext~n-ling radically from said interior
space to the circu--lre- e~lial surface of said eccentric rotating body are formed and there
are provided a central cylindrical body inserted in said interior space of the eccentric
rotating body and a plurality of circul..fe-enlially contacting cylindrical bodies inserted in
said guide grooves and movable freely in a radial direction.
Under this arrangement, said plurality of circu~n~ lially contacting cylindrical bodies
are placed in a planetary relationship relative to said central cylindrical body, and the
outer circull-rerelllial surfaces of said circul--fel e-llially cont~cting bodies are brought into
press contact with the interior wall of said pump case while the circumft renlial surfaces of
said circu-.lfe-e-llially cont~cting bodies on their center sides are brought into press
contact with said central cylindrical body, whereby said circulllfelelllially cont~cting
bodies are made to act as compressing and forcibly sending members.
Brief description of the draw;n~
Fig. I is a vertical section ( in a crossing direction in plane ) of a forced
compression type pump which is an embodiment of the present invention.
Fig. 2 is a cross section, taken along the S - S line in Fig. 1.
Fig. 3 is a vertical section ( in a longitudinal direction in plane ) of a forced
compression type pump of the present invention.
Fig. 4 is a vertical section ( similar to Fig. I ) of a known forced compression
type pump.

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Detailed description of a preferred embodiment of the invention
The present invention is described below in detail, with reference to
embodiments shown in Fig. I - Fig. 3 ).
Similarly to the known forced compression type pump, a forced compression
type pump of the present invention is composed of a cylindrically shaped pump case
having an interior space, an eccentric rotating body shaft-supported on said pump case at
an eccentric position thereof and a co~l~pressing and forcibly sending member movable in
a radial direction of said eccentric rotating body and adapted to be brought into press
contact with the interior wall of said pump case. However, in embodying the present
invention, an interior space 3 is formed at the central position of said eccentric rotating
body B and a plurality of guide grooves 4 extending radically from said interior space 3 to
the circulllreren~ial surface of said eccentric rotating body B are formed, and there are
provided a plurality of circunlfel en~ially cont~cting cylindrical bodies 5 that are inserted in
said guide grooves 4 and are movable in a radial direction, with their axial center direction
in parallel with the axial center of said eccentric rotating body B and a central cylindrical
body 6 that is inserted in said interior space 3 and is circulllrere~l~ially contacted with a
plurality of cylindrical body 5. The outer circulll~l en~ial surface of said circulllfe, el"ially
cont~ctinSg cylindrical bodies 5 are brought into press contact with the interior wall of said
pump case A and are made to act as compressing and forcibly sending members C.
Referring to Fig. 1, a plurality of guide grooves 4 formed radically on said
eccentric rotating body B are positioned in such a fashion that the extension line Z2 of the
wall surface 4a of the guide groove 4 is in parallel with the line Z 1 which passes throu;gh
the axial center Pl of the eccentric rotating body B and the axial center P2 of the

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circull.feren~ially cont~ctin~ cylindrical body 5.
The eccentric rotating body B is shaft-supported on the pump case A in an
eccentric position by a bearing 7 and is rotated by a driving gear 8. The eccentric rotating
body B is in eccentric position relative to the pump case A but the central cylindrical body
6 is positioned at the axial center P3 of the cylindrically shaped interior space (in vertical
section of the pump case A ). In Dig. 3, numeral 9 denotes an 0- ring for sealing.
While the eccentric rotating body B is turning, both the circumferential
contacting cylindrical body S and the central cylindrical body 6 are rotating at all times
and consequently, while the circumferential surface on the inner center side of the
circu--lrere~llial contacting cylindrical body 5 press contacts with the central cylindrical
body 6 as it is rotating, the outer circulllfelel,tial surface ofthe circumferential cylindrical
body S press contacts with the interior wall of the pump case A as it is rotating. Thus, the
interior wall of the pump case A and the circumferential contacting cylindrical body 5 are
in the state of rotary friction to each other at all times.
By the rotation of the eccentric rotating body B, volume of the forcibly sending
member Q is reduced gradually from the inlet side I toward the outlet side 2 so as to
forcibly send gas or liquid.
If the interior wall surface which contacts at least with the circumferential
contacting cylindrical body of the pump case is made of elastic member, it is convenient
for slurry conveyance ( conveyin~ of fine ~rains ) because the interior wall surface can be
deformed elastically.
If the circulnfel ~nLial contacting cylindrical body is made of elastic member or if
it is cylindrically shaped and is elastically deformable, sealing effect on the interior space

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of the eccentric rotating body B can be heightened.
In this case, if the diameter of the circulllrelellLial cont~cting cylindrical body is
made lar~e in relation to the guide groove, it is deformed forcibly into elliptical shape
with the result that it is reduced in its diameter and sealing effect can be heightened.
Possibility of industrial utilization
As mentioned above, in the forced coll~pïes~ion type pump according to the
present invention the circulllrelellLial Cont~ctinE cylindrical body which acts as the
colllplessing and forcibly sending member moves in contact with the interior wall of the
pump case while it is rotating at all times. Therefore, the circunlfelellLial contacting
cylindrical body which acts as the compressing and forcibly sending member and the
interior wall of the pump case are in the state of rotary friction to each other at all times.
Also, as the circulll~el~nlial cont~ctinE cylindrical body is controlled in its eccentric
moving quantity by the guide groove of the eccentric rotary body and the central
cylindrical body, the central cylindrical body and the circulllÇefe''lial contacting cylindrical
body are in rotary contact with each other at a small speed difference and accordingly
abrasion of both the interior wall of the pump case and the compressing and forcibly
sending member is reduced considerably. As a result, the function of the forced
compression type pump is kept semi-permanently and maintenance of the pump is
facilitated.
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