U.S. patent application number 12/521682 was filed with the patent office on 2010-12-16 for diaphragm pump with two diaphragm heads and two separate pump housings.
This patent application is currently assigned to KNF NEUBERGER GMBH. Invention is credited to Erich Becker, Erwin Hauser.
Application Number | 20100316512 12/521682 |
Document ID | / |
Family ID | 39154052 |
Filed Date | 2010-12-16 |
United States Patent
Application |
20100316512 |
Kind Code |
A1 |
Becker; Erich ; et
al. |
December 16, 2010 |
DIAPHRAGM PUMP WITH TWO DIAPHRAGM HEADS AND TWO SEPARATE PUMP
HOUSINGS
Abstract
A diaphragm pump (1) having two diaphragm heads (15), in each
case two diaphragms (6) and two separate pump housings (3) in which
the connecting rods (5) for the diaphragms (6) are arranged, which
connecting rods (5) can be driven by a common shaft (4). The drive
for the shaft (4) can be arranged between the two pump housings
(3). Here, the two pump housings (3) are connected to one another
in an air-permeable fashion in particular by a connecting line (7),
such that the air displaced in each case by the one diaphragm (6)
can be moved into the other pump housing (3) in which the
associated diaphragm (6) leads to a space enlargement as a result
of being driven in the opposite direction.
Inventors: |
Becker; Erich; (Bad
Krozingen, DE) ; Hauser; Erwin; (Emmendingen,
DE) |
Correspondence
Address: |
VOLPE AND KOENIG, P.C.
UNITED PLAZA, 30 SOUTH 17TH STREET
PHILADELPHIA
PA
19103
US
|
Assignee: |
KNF NEUBERGER GMBH
Freiburg
DE
|
Family ID: |
39154052 |
Appl. No.: |
12/521682 |
Filed: |
December 4, 2007 |
PCT Filed: |
December 4, 2007 |
PCT NO: |
PCT/EP07/10520 |
371 Date: |
June 29, 2009 |
Current U.S.
Class: |
417/413.1 ;
417/539 |
Current CPC
Class: |
F04B 45/043
20130101 |
Class at
Publication: |
417/413.1 ;
417/539 |
International
Class: |
F04B 43/02 20060101
F04B043/02; F04B 23/06 20060101 F04B023/06 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 25, 2007 |
DE |
10 2007 003 720.3 |
Claims
1. A diaphragm pump (1) comprising two diaphragm heads (15) and two
separate pump housings (3) and diaphragms (6) provided therein,
with the pump housings (3) being arranged adjacent to each other,
and a drive of the diaphragms (6) being offset by 180 degrees such
that a direction of simultaneous deflection of the diaphragms (6)
of the two pump housings (3) are opposite each other, the two pump
housings (3) are connected to each other in an air-permeable
fashion.
2. The diaphragm pump according to claim 1, wherein as an
air-permeable connection at least one connection line (7) is
provided between the two pump housings (3), which are arranged
essentially parallel in reference to each other, and at least one
of a cross-section or a flow resistance of the at least one
connection line (7) is sized such that at least a portion or all of
the air transported or displaced by a bottom of the diaphragm can
be transported into the other respective pump housing (3).
3. A diaphragm pump according to claim 2, wherein the at least one
connection line (7) connects sides or walls (3a) of the two pump
housings (3) facing each other.
4. A diaphragm pump according to claim 1, wherein at least one of
the two pump housings are of equal size (3) or a displacement
volume of the two diaphragms (6) per stroke are of equal size.
5. A diaphragm pump according to claim 2, further comprising a
common drive shaft for the diaphragms, and at least one seal (8) is
provided in an area of a bearing and penetrating opening for the
common drive shaft (4) at the respective pump housing (3), with a
flow resistance of the seal being greater than the connection line
(7) between the two pump housings (3).
6. A diaphragm pump according to claim 5, wherein a felt washer is
provided as the seal (8) at each of the bearings (9) of the drive
shaft (4) in an area of penetration through the pump housings,
covering said bearings (9).
7. A diaphragm pump according to claim 6, wherein the felt washer
is provided at least at a side of the bearing (9) facing towards an
interior of the pump housing (3).
8. A diaphragm pump according to claim 2, wherein each of the
respective pump housings (3) has an intermediate wall (10) in an
area of a connection rod (5) to separate a crank case (11) from a
motion chamber (12) of a diaphragm head (2), the intermediate wall
includes a penetration opening (13) for the connection rod (5), and
the air-permeable connection or connection line (7) of the two pump
housings (3) is provided between the intermediate wall (10) and a
bottom of the respective diaphragm head (2).
9. A diaphragm pump according to claim 8, wherein the penetrating
opening (13) has at least one of a close tolerance in the
intermediate wall (10) for the connection rod (5) in reference
thereto or comprises a seal (14) or a felt washer that contacts the
connection rod (5) and allows for its motion.
10. A diaphragm pump according to claim 7, wherein the felt washer
is provided at a side of the bearing facing away from an interior
of the pump housing (3).
11. A diaphragm pump according to claim 6, wherein the felt washer
is provided at a side of the bearing facing away from an interior
of the pump housing (3).
Description
BACKGROUND
[0001] The invention relates to a diaphragm pump with two diaphragm
heads and two separate pump housings and diaphragms provided
therein, with the pump housings being arranged adjacent to each
other and the drive of the diaphragms being off-set by 180 degrees
such that the direction of the simultaneous deflections of the
diaphragms of the two diaphragm heads each are in opposite
directions.
[0002] Such diaphragms are known and are proven.
[0003] Here, the air moved from the respective bottom of the
diaphragms must be exhaled from the respective pump housing through
bearings or other places, when the diaphragms perform their
suctioning motion, and the air must again be suctioned in, when the
membrane moves in its driving phase. These air motions result in
considerable noise.
SUMMARY
[0004] Therefore the object is to provide a diaphragm pump with two
diaphragm heads and two separate pump housings having the
advantages of such a "dual" diaphragm pump, but reducing or
avoiding the noise development by the air moved by the bottom of
the diaphragm.
[0005] In order to attain this seemingly contradictory object, the
diaphragm pump defined at the outset is characterized in that the
two--separate--pump housings are connected to each other in an
air-permeable fashion. This way it is achieved that the air moved
by the membranes in the pump housings no longer or only to a minor
extent has to exit to the outside, because the air displaced by one
membrane can flow into the other pump housing when its membrane is
expanding the interior space of the second pump housing. The
respectively displaced air can therefore be moved back and forth
between the two sealed pump housings. This way they can be embodied
in an air-tight or largely air-tight fashion in reference to their
environment.
[0006] Here, it is particularly advantageous when at least one
connecting line is provided between the pump housings, essentially
arranged parallel in reference to each other, and when the
cross-section and/or the flow resistance of the connecting line or
the connecting lines is determined such that at least a portion or
all of the air moved or displaced by the bottom of the diaphragm
can be fed to the respectively other pump housing. Therefore, at
least one connecting line is provided for the air that is moved
back and forth as a particularly simple air-permeable connection so
that the design of the diaphragm pump and its separate pump
housings can remain unchanged and only one appropriate connecting
line needs to be provided.
[0007] The connecting line may particularly connect the sides or
walls of the two pump housings facing each other in a straight
fashion. This practically represents the shortest connection for
the air line, so that therefore its flow resistance is
correspondingly low. Furthermore, usually sufficient unused space
is available in the immediate space between the two pump housings,
in order to allow placing such a connecting line.
[0008] The two separate pump housings and/or the displacement
volume per stroke of the two membranes arranged therein may
beneficially be of the same size. This results in a best-possible
compensation of the respectively displaced air from one to the
other pump housing and back.
[0009] In order to prevent air from leaking at any other location
during its movement back and forth from one pump housing into the
other and back, for example at the bearings or ball bearings, it is
beneficial when in the area of the bearing and penetrating opening
at least one seal is provided at the respective pump housing,
particularly for the common drive shaft, with its flow resistance
being greater than the one of the connecting line between the two
pump housings. A combination of the seal of respective openings at
the pump housings with one or more common connecting lines can
provide better prevention of any air from exiting the pump housing,
so that not only respective noise but also potential contamination
of the environment of the diaphragm pump can be avoided.
[0010] Here, at the bearing of the drive shaft a felt washer
covering each bearing may be provided in the area of the
penetration through the pump housing. Felt washers are effective
seals, themselves not causing any or hardly any noise.
[0011] Here, the felt washer can be located at the side of the
bearing or ball bearing facing towards and/or facing away from the
inside of the pump housing. This may depend on the respective
design of the bearing of the drive shaft.
[0012] Another or an additional measure may be that the respective
pump housing has an intermediate wall in the area of the connecting
rod for driving of the diaphragm to separate the crank case from
the motion chamber of the diaphragm head, provided with a
penetrating opening for said connecting rod, and that the
connection or connecting line of the two pump housings is
particularly provided between this intermediate wall and the bottom
of the respective diaphragm head. This way, too, the air moved by
the diaphragms and/or the diaphragm heads inside the pump housing
is primarily or exclusively guided into the connecting line and
thus any risks for air leaking from the pump housings are further
reduced or avoided.
[0013] Here, it is beneficial for the penetrating opening in the
intermediate wall for the connecting rod to have a close tolerance
and/or a seal or felt washer impinging the connecting rod and
allowing its motion. This way the pneumatic resistance inside the
pump housing against air passing through the connection line is
further increased.
[0014] Primarily in a combination of one or more of the
above-described features and measures a diaphragm pump with two
diaphragm heads and two separate pump housings as well as a common
drive shaft for the two connecting rods is provided, in which the
air moved by the diaphragms and diaphragm heads no longer needs to
exit to the outside because it can be moved back and forth between
the two pump housings via the common air-permeable connection or
connecting line and thus any compressions and relaxations of the
respective air volumes in the pump housings, caused by the
movements of the diaphragm heads, can be compensated.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In the following, exemplary embodiments of the invention are
explained in greater detail using the drawing. It shows in a
partially schematic illustration:
[0016] FIG. 1 is a longitudinal cross-section of a diaphragm pump
according to the invention with two diaphragm heads and two
separate pump housings containing them, which are connected to each
other via a connecting line in an air-permeable fashion, with one
of the diaphragms being shown at the upper dead center and
accordingly the other diaphragm driven opposite thereto shown at
its lower dead center so that the air displaced by the diaphragm
located at its lower dead center is transported into the other pump
housing,
[0017] FIG. 2 is a longitudinal cross-section through one of the
pump housings, rotated by 90 degrees in reference to FIG. 1, which
shows an intermediate wall between the motion chamber of the
diaphragm and the crank case penetrated by the connecting rod and
the connecting line to the second pump housing, not shown, being
arranged between the bottom of the diaphragm and/or the diaphragm
and said intermediate wall, and
[0018] FIG. 3 is a partial longitudinal cross-section similar to
FIG. 2, rotated by 90 degrees in reference thereto, with
additionally a seal being provided for the connecting rod in the
penetrating opening in the intermediate wall.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0019] A diaphragm pump, in its entirety marked 1, has two
diaphragms 6 and two separate pump housings 3, containing them and
arranged adjacent in reference to each other, as well as two
diaphragm heads 15, with a common drive shaft 4 driving the
connecting rods 5 for the two membranes 6. Here, the drive of the
two diaphragms 6 and/or the two mushroom-shaped connecting rod
heads 2 carrying them, as clearly shown in FIG. 1, are off-set by
180 degrees such that the direction of the simultaneous deflections
of the membranes 6 of the two rod heads 2 are opposing each
other.
[0020] It is clearly discernible in FIG. 1 that the rod head 2,
with the diaphragm 6 shown at the left, has just reached the top
position, while the other rod head 2 with its diaphragm 6,
according to the off-set of the drive by 180 degrees, has reached
the opposite position, namely the bottom position. While one rod
head 2 is located at the upper dead center, the other rod head 2
has therefore reached the bottom dead center, which constantly
alternates during the operation of the diaphragm pump 1.
[0021] FIGS. 1 and 2 show that the two pump housings 3 are
connected to each other in an air-permeable fashion with the help
of a connecting line 7, so that the air displaced by the rod head 2
moving downwards can be transported via this connecting line 7 into
the other pump housing 3, where the upward motion of the rod head 2
just leads to an enlargement of the air volume inside the pump
housing 3 so that a continuous exchange of the respectively
displaced and required air volumes between the two pump housings 3
is possible via the connecting line 7. Therefore, no amount of air
displaced by the connecting rod heads 2 and the diaphragms 6 needs
to exit the pump housing 3 so that consequently no noise develops
caused by such exhalation.
[0022] The cross-section of the connecting line 7 provided between
the pump housings 3 essentially arranged parallel in reference to
each other and their flow resistance are here sized such that, to
the extent possible, the entire air moved and displaced by the
respective bottom of the membrane is transported into the
respectively other pump housing 3.
[0023] This is fostered in that the two pump housings 3 and
primarily the transportation volume resulting from each stroke of
the diaphragms 6 are of identical size so that for each stroke of
one of the connecting rod heads 2 with the diaphragms 6
simultaneously the air volume is accepted in the respective pump
housing 3 which is displaced by the motion of the opposite stroke
in the adjacent pump housing 3.
[0024] In FIG. 1 it is discernible that the connection line 7
connects the two pump housings 3 at their sides or walls 3a facing
each other in a straight line so that a connecting line 7 is
enabled as short as possible, which may be either flexible or
stiff, in order to connect the two pump housings 3 to each other in
a stable fashion.
[0025] FIG. 1 also shows that in the area of the bearing or
penetrating opening for the entire drive shaft 4, at the respective
pump housing 3, at least one seal 8 is provided, with its flow
resistance being greater than the one of the connecting line 7
between the two pump housings 3, which additionally contributes to
the air respectively displaced by the bottom of the connecting rod
heads 2 and the membranes 6 is moved practically in its entirety
back and forth through the connecting line 7. Here, a felt washer
each is provided at the respective bearing 9 of the drive shaft 4
in the area of the penetration through the wall of the pump
housing, covering the bearing 9 as a seal 8, which is mounted in
the exemplary embodiment at the side of the bearing or ball bearing
9 facing away from the interior of the respective pump housing 3.
However, it may also be provided at the side or the two sides of
the respective bearings facing towards the interior of the pump
housing 3.
[0026] In FIGS. 2 and 3, as an additional measure to largely
transport exclusively the respectively displaced air through the
connecting line 7, it is shown that the respective pump housing 3
in the area of the connecting rod 5 has an intermediate wall 10 for
separating the crank case 11 from the motion chamber 12 of the
diaphragm 6, with a penetrating opening 13 being necessary and
provided for the connecting rod 5 and the connecting line of the
two pump housings 3 being arranged between said intermediate wall
10 and the bottom of the respective connecting rod head 2. The
intermediate wall and a penetrating opening 13 as narrow as
possible improve the transportation of the air displaced at the
bottom of the respective connecting rod head during its downward
motion into and through the connecting line 7.
[0027] In addition to a close tolerance of said penetrating opening
13 in reference to the connecting rod 5 additionally, according to
FIG. 3, a seal 14 may be provided, impinging the connecting rod 5
and allowing its motion, for example a felt washer, which according
to FIG. 3 engages the recesses of the edge of the penetrating
opening 13.
[0028] By the air-tight connection of the two parallel separate
pump housings 3 via at least one connection line 7 the air
respectively displaced by the motion of the diaphragms 6 can be
transported from one into the other pump housing 3 and back due to
the opposite motions so that an exhalation of said displaced aid
from the pump housings 3 and thus any noise connected thereto can
be avoided or largely avoided.
[0029] The diaphragm pump 1 has two diaphragm heads 15, two
diaphragms 6 each, and two separate pump housings 3, in which the
connecting rods 5 with connecting rod heads 2 for the diaphragms 6
is arranged, which may be driven by a common shaft 4, and the drive
for the shaft 4 may be arranged between the two pump housings 3.
The two pump housings 3 are here connected to each other in an
air-permeable fashion, particularly via a connection line 7, so
that the air respectively displaced by one diaphragm 6 can be moved
into the other pump housing 3, in which the corresponding diaphragm
6 leads to an expanding space due to the opposite drive.
* * * * *