U.S. patent application number 10/519589 was filed with the patent office on 2006-03-09 for pump comprising a shield valve controlled by the conveying medium.
This patent application is currently assigned to KNF Neuberger GmbH. Invention is credited to Erich Becker, Erwin Hauser.
Application Number | 20060051219 10/519589 |
Document ID | / |
Family ID | 30128242 |
Filed Date | 2006-03-09 |
United States Patent
Application |
20060051219 |
Kind Code |
A1 |
Becker; Erich ; et
al. |
March 9, 2006 |
Pump comprising a shield valve controlled by the conveying
medium
Abstract
A pump is provided having at least one shield valve controlled
by the conveyed medium and having a valve disk (4) of flexible
material which is clamped in a central region and is movable
between an open and a closed position, in which closed position the
valve disk (4) closes at least one valve opening (9). The pump
according to the invention includes extensions (11) that project
from the valve disk (4) and/or on a valve abutment surface (10)
arranged on a side remote from the valve opening (9), for avoiding
a sudden flat abutment of the valve disk (4) on the valve abutment
surface and/or for limiting the valve opening movement. The pump
according to the invention is distinguished by a particularly low
noise operation.
Inventors: |
Becker; Erich; (Bad
Krozingen, DE) ; Hauser; Erwin; (Emmendingen,
DE) |
Correspondence
Address: |
VOLPE AND KOENIG, P.C.
UNITED PLAZA, SUITE 1600
30 SOUTH 17TH STREET
PHILADELPHIA
PA
19103
US
|
Assignee: |
KNF Neuberger GmbH
Alter Weg 3
Freiburg
DE
79112
|
Family ID: |
30128242 |
Appl. No.: |
10/519589 |
Filed: |
May 14, 2003 |
PCT Filed: |
May 14, 2003 |
PCT NO: |
PCT/EP03/05044 |
371 Date: |
December 28, 2004 |
Current U.S.
Class: |
417/413.1 ;
417/415 |
Current CPC
Class: |
F04B 39/108 20130101;
F04B 53/1065 20130101 |
Class at
Publication: |
417/413.1 ;
417/415 |
International
Class: |
F04B 17/00 20060101
F04B017/00; F04B 35/04 20060101 F04B035/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 22, 2002 |
DE |
102 33 302.5 |
Claims
1. Pump (1) comprising at least one shield valve controlled by a
conveyed medium and having a valve disk (4) of flexible material,
which is clamped in a central region and is movable between an open
position and a closed position, in said closed position the valve
disk (4) closes at least one valve opening (9), wherein extensions
(11) project from the valve disk (4) and/or on a valve abutment
surface (10) arranged on a side thereof remote from the valve
opening (9), for preventing a sudden flat abutment of the valve
disk on the valve abutment surface and/or for limiting valve
opening motion.
2. Pump according to claim 1, wherein the extensions (11) provided
on the valve disk (4) project in step form from a peripheral edge
of the valve disk (4) and act on a region of the shield valve
surrounding the valve abutment surface (10).
3. Pump according to claim 1 or 2, wherein the valve disk (4) has
the plurality of extensions (11) projecting generally uniformly
from the peripheral edge of the disk.
4. Pump according to one of claims 1-3, wherein the valve abutment
surface (10) has an approximately conical shape.
5. Pump according to one of claims 1-4, wherein a central region of
the valve disk (4) is centered by a pin (7) which passes through a
central perforation (8) of the valve disk (4).
6. Pump according to one of claims 1-5, wherein the valve disk (4)
is connected by at least one of the step-shaped extensions (11)
with a sealing ring (13) surrounding the valve disk (4), the
sealing ring (13) is clamped between two housing portions (5,
6).
7. Pump according to one of claims 1-6, wherein the at least one
extension (11) connecting the valve disk (4) and the sealing ring
(13) extends at least sectionally transversely to the disk radius
and runs in a spiral form.
8. Pump according to one of claims 1-7, wherein at least one gap
(14) acting as a passage opening is provided between the sealing
ring (13) and the valve disk (4).
Description
BACKGROUND
[0001] The invention relates to a pump with at least one shield
valve controlled by the conveyed medium, and having a valve disk of
flexible material which is clamped in a central region and is
movable between an open position and a closed position, in which
closed position the valve shield closes at least one valve
opening.
[0002] From DE 42 00 838 A1 a diaphragm pump is already known, the
inlet and outlet valves of which are respectively formed as a
shield valve controlled by the conveyed medium. Each of these
shield valves has a valve disk of flexible material which is
clamped in the central region and is movable between an open
position and a closed position. While the valve disk in its closed
position closes at least one valve opening, in its open position it
abuts at least locally on a valve abutment surface arranged on a
side remote from the valve opening.
[0003] Due to the opening and closing movements of the valve disk,
this valve disk can also fit flat against the valve abutment
surface and suddenly expel the air present between the valve disk
and the valve abutment surface, whereby an annoying noise
arises.
SUMMARY
[0004] The object therefore in particular exists of providing a
pump equipped with at least one shield valve of the type mentioned
above, which is distinguished by a comparatively low noise
development.
[0005] The solution of this object according to the invention is
provided for the known type of pump, particularly in that
extensions project from the valve disk and/or on a valve abutment
surface arranged on its side remote from the valve opening, to
prevent a sudden flat abutment of the valve disk on the valve
abutment surface and/or for limiting the valve opening
movement.
[0006] The pump according to the invention has at least one shield
valve, in which extensions project from the valve disk and/or on
the valve abutment surface. A valve abutment surface is arranged to
prevent a sudden flat abutment of the valve disk on a side arranged
toward the valve opening. Since extensions are provided on the
valve disk and/or on the valve abutment surface, a sudden abutment
of the valve disk on the valve abutment surface is prevented, and
the air present between the valve disk and the valve abutment
surface can escape without an annoying slapping sound being
expected in the region of this shield valve.
[0007] A preferred embodiment according to the invention provides
that the extensions provided on the valve disk project in step
shape beyond the peripheral edge of the disk of the valve disk and
act on the region of the shield valve surrounding the valve
abutment surface. Due to the step-shaped extensions on the disk
periphery of the valve disk, the valve disk abuts on the valve
abutment surface at most in a wave form, so that a sudden impact of
the valve disk on the valve abutment surface, and thus an annoying
noise development, is prevented.
[0008] In order to prevent a loud impact of the valve disk over the
whole disk periphery, it is advantageous if the valve disk has a
plurality of extensions projecting approximately uniformly over the
peripheral edge of the disk.
[0009] So that the valve abutment surface can flatten the valve
disk out into its disk shape corresponding to the open position, it
is appropriate if the valve abutment surface is generally
cone-shaped.
[0010] A preferred embodiment according to the invention provides
that the central region of the valve disk is centered by means of a
pin which passes through a central perforation of the valve
disk.
[0011] A further development according to the invention, of
importance worthy of its own protection, provides that the valve
disk is connected by at least one of the step-shaped extensions
with a sealing ring surrounding the valve disk and sealingly
clamped between two housing portions. This embodiment according to
the invention offers the advantage that an inadvertent rotation of
the valve disk during the opening and closing motions is avoided
and a corresponding wear on the valve disk is prevented.
Furthermore, an additional, separate sealing ring can be omitted
which otherwise seals the valve opening between an intermediate
cover and a pump head cover. Finally, a certain prestress is
produced on these step-shaped extensions by the extensions
connecting the sealing ring and the valve disk, and slows the
opening of the valve disk and reduces the path of opening, avoids a
sudden escape of the air located between the valve disk and the
valve abutment surface, and additionally opposes an annoying
development of noise.
[0012] A preferred embodiment according to the invention, which
does not excessively prevent the opening movement of the valve
disk, provides that the at least one extension connecting the valve
disk and the sealing ring runs at least sectionally transversely of
the disk radius, and in particular runs in a spiral shape.
[0013] It is particularly advantageous if at least one gap acting
as a passage opening is provided between the sealing ring and the
valve disk.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Further features of the invention will become apparent from
the following description of an embodiment example according to the
invention in connection with the claims and the accompanying
drawing.
[0015] FIG. 1 shows a diaphragm pump in longitudinal section, the
inlet and outlet valves of which are formed as shield valves,
[0016] FIG. 2 shows an inlet valve of the diaphragm pump shown in
FIG. 1, in its closed position,
[0017] FIG. 3 shows the inlet valve of FIG. 2 in its open
position,
[0018] FIG. 4 shows the valve disk of the shield valve shown in
FIGS. 2 and 3, in a plan view,
[0019] FIG. 5 shows a shield valve whose valve disk has a shape
altered from that of FIGS. 2 and 3, the shield valve being shown in
its closed position,
[0020] FIG. 6 shows the shield valve of FIG. 5 in its open
position, in which the valve disk is at least approximately on a
valve abutment surface, and
[0021] FIG. 7 shows the valve disk of the shield valve shown in
FIGS. 5 and 6, in a plan view.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0022] A diaphragm pump 1 is shown in FIG. 1, with its inlet valve
2 and its outlet valve 3 being respectively embodied as shield
valves. The shield valves 2, 3 of the diaphragm pump 1 shown in
FIG. 1 have a valve disk 4 controlled by the conveyed medium and
clamped in a central region between a pump head cover 5 and an
intermediate cover 6, and centered by means of a pin 7 which passes
through a central perforation 8 of the valve disk 4.
[0023] The valve disk 4 of the shield valves 2, 3 is movable
between a closed and an open position. While the valve disk 4 in
its closed position closes at least one valve opening 9, it moves
during its opening motion in the direction toward a valve abutment
surface 10.
[0024] In order to limit the valve opening motion of the valve disk
4 of the shield valves shown in FIGS. 1-4, and in order to prevent
a sudden flat abutment of the valve disk 4 on the valve abutment
surface 10, which otherwise would be associated with an annoying
noise production, extensions 11 which project in step form beyond
the peripheral edge of the disk of the valve disk 4 are provided on
the valve disks 4 of the shield valves, as shown in more detail in
FIGS. 1-4 on the one hand and in FIGS. 5-7 on the other hand.
[0025] It can be seen from FIGS. 5 and 6 that the extensions 11
provided on the valve disk 4 of this shield valve act on the region
12 surrounding the valve abutment surface 10 such that a first
contact between the extensions 11 and the valve abutment surface 10
takes place during the opening motion of the shield valve, before
the abutment of the valve disk 4 on the valve abutment surface 10.
Thus the air located between the valve disk 4 and the valve
abutment surface 10 can escape. Since the valve disk 4 thereby
makes a wave-form opening motion, a slapping abutment of the valve
disk on the valve abutment surface 10, with an associated annoying
noise, is prevented.
[0026] It can be seen from FIGS. 5 and 6 that the valve abutment
surface 10 is of conical shape and thus substantially matches the
shape of the valve disk 4 in the open position.
[0027] It can be gathered from FIGS. 1-4 that the valve disk 4 of
the shield valves shown there has step-shaped extensions 11 which
connect together the valve disk 4 on the one hand and the sealing
ring 13 surrounding the valve disk 4 on the other hand. This
sealing ring 13 is clamped between the pump head cover 5 and the
intermediate cover 6 and seals the shield valve in the parting
plane lying therebetween.
[0028] It is clear from the plan view in FIG. 4 that the extensions
11 connecting together the valve disk 4 and the sealing ring 13 are
at least sectionally transverse of the disk radius and in
particular are of spiral form. These extensions prevent a rotary
motion of the valve disk 4 around the pin 7 and hence a
corresponding wear, and limit--as can well be seen in FIG. 3--the
valve opening motion such that a noisy sudden abutment of the valve
disk 4 on the valve abutment surface 10 is prevented with
certainty.
[0029] It is to be gathered from FIG. 4 that at least one gap 14
acting as a passage opening is provided between the sealing ring 12
and the valve disk 4.
[0030] A pump equipped with the shield valves shown in FIGS. 1-7 is
distinguished by a particularly low-noise operation.
* * * * *