U.S. patent application number 16/970386 was filed with the patent office on 2021-04-15 for wet and dry vacuum cleaner.
The applicant listed for this patent is Hilti Aktiengesellschaft. Invention is credited to Xaver HANSLMEIER, Svenja MULLER.
Application Number | 20210106193 16/970386 |
Document ID | / |
Family ID | 1000005301036 |
Filed Date | 2021-04-15 |
United States Patent
Application |
20210106193 |
Kind Code |
A1 |
HANSLMEIER; Xaver ; et
al. |
April 15, 2021 |
WET AND DRY VACUUM CLEANER
Abstract
A wet and dry vacuum cleaner having a vacuum cleaner head,
having a dirt container and having an inlet fitting which is
designed for the connection of a suction hose, wherein the inlet
fitting is connected in terms of flow to an inlet connector, which
is situated in the wet and dry vacuum cleaner, of the wet and dry
vacuum cleaner such that dirt particles that are drawn in can pass
via the inlet connector into the dirt container, wherein the inlet
connector is designed as a diffuser with horizontal outflow.
Inventors: |
HANSLMEIER; Xaver;
(Mauerstetten, DE) ; MULLER; Svenja; (Friedberg,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hilti Aktiengesellschaft |
Schaan |
|
LI |
|
|
Family ID: |
1000005301036 |
Appl. No.: |
16/970386 |
Filed: |
March 21, 2019 |
PCT Filed: |
March 21, 2019 |
PCT NO: |
PCT/EP2019/057018 |
371 Date: |
August 17, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47L 9/248 20130101;
A47L 9/12 20130101; A47L 7/0019 20130101 |
International
Class: |
A47L 7/00 20060101
A47L007/00; A47L 9/24 20060101 A47L009/24; A47L 9/12 20060101
A47L009/12 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 22, 2018 |
EP |
18163236.5 |
Claims
1-10. (canceled)
11. A wet and dry vacuum cleaner comprising: a vacuum cleaner head
having a dirt container and having an inlet fitting designed for
the connection of a suction hose, the inlet fitting being connected
in terms of flow to an inlet connector situated in the wet and dry
vacuum cleaner such that dirt particles drawn in can pass via the
inlet connector into the dirt container, the inlet connector being
designed as a diffuser with horizontal outflow.
12. The wet and dry vacuum cleaner recited in claim 11 wherein a
suction flow through the inlet connector designed as the diffuser
is directed toward an inner wall of the dirt container.
13. The wet and dry vacuum cleaner as recited in claim 12 wherein
the inner wall of the dirt container is a side wall of the dirt
container.
14. The wet and dry vacuum cleaner as recited in claim 12 wherein
the inlet connector has a diffuser opening, a wall spacing of the
diffuser opening with respect to the inner wall being less than one
fifth of a container width of the dirt container.
15. The wet and dry vacuum cleaner as recited in claim 11 wherein a
cross-sectional area of a diffuser opening of the diffuser is at
least 50 percent larger than a cross-sectional area of the inlet
fitting in a region of the wall passage into the dirt
container.
16. The wet and dry vacuum cleaner as recited in claim 11 wherein
the inlet connector is arranged in a volume defined by the dirt
container.
17. The wet and dry vacuum cleaner as recited in claim 16 wherein
the inlet connector is arranged exclusively in the volume.
18. The wet and dry vacuum cleaner as recited in claim 11 further
comprising an electric turbine arranged in the vacuum cleaner
head.
19. The wet and dry vacuum cleaner as recited in claim 11 further
comprising a dirt filter positioned, in relation to the suction
flow, downstream of the inlet connector.
20. The wet and dry vacuum cleaner as recited in claim 11 wherein
the inlet connector is formed as a single piece.
21. The wet and dry vacuum cleaner as recited in claim 11 wherein
the inlet connector is formed integrally on the dirt container.
22. The wet and dry vacuum cleaner as recited in claim 11 wherein
the inlet connector is composed of plastic.
Description
[0001] The present invention relates to a wet and dry vacuum
cleaner having a vacuum cleaner head, having a dirt container and
having an inlet fitting which is designed for the connection of a
suction hose. The inlet fitting is connected in terms of flow to an
inlet connector, which is situated in the wet and dry vacuum
cleaner, of the wet and dry vacuum cleaner such that dirt particles
that are drawn in can pass via the inlet connector into the dirt
container.
BACKGROUND
[0002] Wet and dry vacuum cleaners of the type mentioned in the
introduction are known in principle from the prior art. They serve
for example for extracting dirt particles such as those which
typically form during work performed with angle grinders. For this
purpose, a suction hose is connected to the inlet fitting, which
suction hose is in turn connected by way of example to an angle
grinder. In the case of the so-called wet application, dirty water
is drawn in. In the case of dry applications, only or predominantly
dry dirt particles are drawn in.
SUMMARY OF THE INVENTION
[0003] It is an object of the present invention to provide a wet
and dry vacuum cleaner which exhibits improved operating
behavior.
[0004] The present invention provides that the inlet connector is
designed as a diffuser with horizontal outflow.
[0005] The present invention incorporates the realization that, in
the case of wet and dry vacuum cleaners of the prior art, the inlet
fitting and/or the inlet connector are typically positioned in the
vacuum cleaner head, as a result of which the available volume of
the dirt container can be optimally utilized. Here, the inlet
connector is typically oriented directly into the dirt container,
which results in undesired stirring-up and swirling of the already
drawn-in dirt particles in the dirt container. It has been observed
that this leads to a premature shut-off in the case of wet
applications and to a relatively short filter service life in the
case of dry applications. By virtue of the inlet connector being
designed according to the invention as a diffuser with horizontal
outflow, these disadvantages can be avoided. A layered introduction
of dirt particles into the dirt container, without swirling in the
dirt container, is rather promoted.
[0006] It has proven to be advantageous if a suction flow through
the inlet connector designed as a diffuser is directed toward an
inner wall of the dirt container. The rebounding of the suction
flow from the inner wall decelerates or slows the drawn-in air with
the dirt particles, leading to a further improvement in the
introduction of dirt particles into the dirt container.
[0007] The inner wall of the dirt container is preferably a side
wall of the dirt container. The inner wall need not imperatively be
a side wall of the dirt container. Rather, the inner wall may also
be a further wall, within the wet and dry vacuum cleaner, which is
oriented vertically and/or the area of which is at least as large
as a cross-sectional area of the diffuser opening of the inlet
connector.
[0008] In a particularly preferred embodiment, the inlet connector
designed as a diffuser has a diffuser opening, the wall spacing of
which with respect to the inner wall is less than one fifth of the
container width of the dirt container.
[0009] A cross-sectional area of the diffuser opening is preferably
at least 50% larger than a cross-sectional area of the inlet
fitting in the region of the wall passage into the dirt
container.
[0010] The diffuser opening may be arranged, preferably
exclusively, in the upper third of the dirt container.
[0011] It has proven to be advantageous if the inlet connector
designed as a diffuser is arranged in a volume defined by the dirt
container. The inlet connector designed as a diffuser is
particularly preferably arranged exclusively in a volume defined by
the dirt container.
[0012] The wet and dry vacuum cleaner particularly preferably has
an electric turbine arranged in the vacuum cleaner head. The wet
and dry vacuum cleaner may have a dirt filter which, in relation to
the suction flow, is positioned downstream of the inlet connector
designed as a diffuser.
[0013] In a further preferred embodiment, the inlet connector
designed as a diffuser is formed as a single piece. The inlet
connector designed as a diffuser may be formed integrally on the
dirt container. The inlet connector designed as a diffuser is
preferably composed of plastic or polymer.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Further advantages will become apparent from the following
description of the figures. A preferred exemplary embodiment of the
present invention is illustrated in FIG. 1 in which a schematically
wet and dry vacuum cleaner is shown. The FIGURE, the description
and the claims contain numerous features in combination. A person
skilled in the art will expediently also consider the features
individually and combine them to form expedient further
combinations.
DETAILED DESCRIPTION
[0015] A preferred exemplary embodiment of a wet and dry vacuum
cleaner 100 according to the invention is illustrated in FIG. 1.
The wet and dry vacuum cleaner 100 has a vacuum cleaner head 10, a
dirt container 20 and an inlet fitting 25 designed for the
connection of a suction hose 200.
[0016] The suction hose 200 to be connected to the inlet fitting 25
is illustrated schematically in FIG. 1.
[0017] The wet and dry vacuum cleaner 100 furthermore has an inlet
connector 27, which is connected in terms of flow to the inlet
fitting 25 such that dirt particles P that are drawn in can pass
via the inlet connector 27 into the dirt container 20.
[0018] As can be seen from FIG. 1, the inlet connector 27 is
designed according to the invention as a diffuser with horizontal
outflow.
[0019] As can be seen from the FIGURE, the inlet connector 27
designed as a diffuser is arranged exclusively in a volume V
defined by the dirt container 20. Furthermore, the diffuser
designed as an inlet connector 27 is arranged such that a suction
flow S is oriented directly toward an inner wall 21 of the dirt
container 20. In other words, the suction flow S flows through the
diffuser opening 28 of the inlet connector 27 in a horizontal
direction H toward the inner wall 21, rebounds from the latter, and
passes, having been slowed, into the lower region of the dirt
container 20, whereby the dirt particles P can be introduced in
layered fashion without swirling or at least with considerably
reduced swirling.
[0020] As can likewise be seen from FIG. 1, the diffuser opening 28
of the inlet connector 27 has a wall spacing WA to the inner wall
21, wherein the wall spacing WA is less than one fifth of the
container width B of the dirt container 20.
[0021] A cross-sectional area Q1 of the diffuser opening 28 is, in
the present exemplary embodiment, at least 50% larger than a
cross-sectional area Q2 of the inlet fitting 25 in the region of
the wall passage into the dirt container 20.
[0022] The wet and dry vacuum cleaner 100 of FIG. 1 furthermore has
an electric turbine arranged in the vacuum cleaner head 10. The
suction flow S is generated by means of said electric turbine, by
means of which suction flow the dirt particles P are drawn into the
dirt container 20 in the course of a wet application or a dry
application.
[0023] The wet and dry vacuum cleaner 100 furthermore has a dirt
filter 17 which, in relation to the suction flow S, is positioned
downstream of the inlet connector 27 designed as a diffuser. In the
exemplary embodiment illustrated here, the dirt filter 17 is
arranged at the transition between vacuum cleaner head 10 and dirt
container 20.
[0024] The vacuum cleaner head 10 lies on the dirt container 20
from above and is locked on the latter (locking not illustrated).
In the preferred exemplary embodiment of FIG. 1, the inlet
connector 27 designed as a diffuser is formed as a single piece and
is formed integrally directly on the dirt container 20. Here, both
the inlet connector 27 and the dirt container 20 are composed of
plastic.
[0025] In alternative embodiments, the dirt container 20 may be
manufactured for example from metal, into which, for example, there
is fitted an inlet connector composed of plastic or polymer
together with an inlet fitting 25 composed of plastic or
polymer.
LIST OF REFERENCE SIGNS
[0026] 10 Vacuum cleaner head [0027] 15 Electric turbine [0028] 17
Dirt filter [0029] 20 Dirt container [0030] 21 Inner wall [0031] 25
Inlet fitting [0032] 27 Inlet connector [0033] 28 Diffuser opening
[0034] 100 Wet and dry vacuum cleaner [0035] 200 Suction hose
[0036] B Container width [0037] H Horizon [0038] P Dirt particles
[0039] Q1 Cross-sectional area of the diffuser opening [0040] Q2
Cross-sectional area of the inlet fitting [0041] S Suction flow
[0042] V Volume of the dirt container [0043] WA Wall spacing
* * * * *