U.S. patent application number 16/999097 was filed with the patent office on 2020-12-03 for backpack vacuum cleaner.
The applicant listed for this patent is Suzhou Premier Electrical Appliance Co., Ltd. Invention is credited to Jian Huang, Xinhua Wang.
Application Number | 20200375421 16/999097 |
Document ID | / |
Family ID | 1000005047675 |
Filed Date | 2020-12-03 |
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United States Patent
Application |
20200375421 |
Kind Code |
A1 |
Huang; Jian ; et
al. |
December 3, 2020 |
BACKPACK VACUUM CLEANER
Abstract
The present invention discloses a backpack vacuum cleaner, which
includes a dust collection part, a base part, a vacuum electric fan
and an air pressure alarm unit. The vacuum electric fan introduces
dust-containing airflow into a dust collection bag from a dust
inlet and guides air entering an exhaust space to an exhaust port.
An air pressure detection element arranged in the tank detects the
pressure in the exhaust space. The alarm sends an alarm signal to
the outside and can decide whether to give an alarm to the outside
based on a detection result of the air pressure detection
element.
Inventors: |
Huang; Jian; (Suzhou,
CN) ; Wang; Xinhua; (Suzhou, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Suzhou Premier Electrical Appliance Co., Ltd |
Suzhou |
|
CN |
|
|
Family ID: |
1000005047675 |
Appl. No.: |
16/999097 |
Filed: |
August 21, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47L 9/1683 20130101;
A47L 5/36 20130101; A47L 9/22 20130101 |
International
Class: |
A47L 5/36 20060101
A47L005/36; A47L 9/22 20060101 A47L009/22; A47L 9/16 20060101
A47L009/16 |
Claims
1. A backpack vacuum cleaner, comprising: a dust collection part
comprising a tank with a dust inlet, wherein a dust collection
container and a high-efficiency filter are mounted inside the tank,
the dust collection container comprises a dust collection bag made
of a breathable material, the high-efficiency filter is cylindrical
and sleeved outside the dust collection bag, and an exhaust space
is arranged between the high-efficiency filter and an inner wall
surface of the tank; the dust inlet, the dust collection bag, the
high-efficiency filter and the exhaust space are sequentially
communicated; the tank comprises a tank body with a hollow internal
structure and an openable tank cover mounted on the top of the tank
body, and the dust inlet is arranged on the tank cover; a short air
inlet pipe communicated with the dust inlet is arranged at the
bottom of the tank cover and extends downwards from the dust inlet,
and a tail end of the short air inlet pipe extends into the dust
collection bag; a base part comprising a housing adjoining below
the tank, an exhaust port communicated with the outside being
arranged on the housing; a vacuum electric fan for introducing
dust-containing airflow into the dust collection bag from the dust
inlet and guiding air entering the exhaust space to the exhaust
port; an air pressure alarm unit comprising an air pressure
detection element arranged on the tank and used for detecting
pressure in the exhaust space and an alarm used for sending an
alarm signal to the outside, wherein the alarm can decide whether
to send an alarm signal to the outside based on a detection result
of the air pressure detection element; the air pressure detection
element comprises an air pressure sensor, an air pressure
processing chip and an air pressure sensing switch, the air
pressure sensor detects the pressure in the exhaust space and
outputs pressure data to the air pressure processing chip, and the
air pressure processing chip outputs corresponding electrical
signals to the air pressure sensing switch; and the air pressure
sensing switch and the alarm are connected in series in an alarm
circuit.
2. The backpack vacuum cleaner according to claim 1, wherein the
alarm comprises a warning light and/or a buzzer arranged on the
housing.
3. The backpack vacuum cleaner according to claim 1, wherein a hook
is arranged on the tank body, a circumferential slot is arranged on
an outer edge of the tank cover, and the tank cover is fixed to an
upper part of the tank body by the hook being clamped in the
slot.
4. The backpack vacuum cleaner according to claim 1, wherein a hole
communicated with the exhaust space is formed in a wall of the
tank, and the air pressure detection element is assembled at the
hole.
5. The backpack vacuum cleaner according to claim 1, wherein the
housing and the tank are integrally provided.
6. The backpack vacuum cleaner according to claim 1, wherein the
vacuum electric fan comprises an impeller assembly and a motor for
driving the impeller assembly to rotate to generate a negative
pressure, the motor is arranged in the housing, and the impeller
assembly is arranged in the tank and/or the housing.
7. The backpack vacuum cleaner according to claim 1, wherein the
high-efficiency filter has a first vertical centerline extending in
an up-down direction, and the dust collection bag has a second
vertical centerline extending in the up-down direction, and the
first vertical centerline coincides with the second vertical
centerline.
8. The backpack vacuum cleaner according to claim 1, wherein the
dust collection bag has a double-layer dust bag structure, the dust
bag in an inner layer is a disposable paper dust bag that is easy
to replace, and the dust bag in an outer layer is a cloth dust bag
reusable after cleaning.
9. The backpack vacuum cleaner according to claim 8, wherein the
cloth dust bag consists of two surface layers of non-woven fabrics
and a cotton core sandwiched therebetween.
10. The backpack vacuum cleaner according to claim 1, wherein the
high-efficiency filter comprises a cylindrical filter element which
is circumferentially formed in a pleated and folded manner and a
support member fixed on an outer side and/or an inner side of the
cylindrical filter element.
11. The backpack vacuum cleaner according to claim 10, wherein the
support member comprises a pair of cylindrical support meshes, and
the cylindrical filter element in a pleated form is sandwiched
between the pair of support meshes.
12. The backpack vacuum cleaner according to claim 11, wherein the
support meshes are made of a stretched metal mesh.
13. The backpack vacuum cleaner according to claim 11, wherein the
support meshes are edge-sealed and fixed at seams with smooth
splicing strips.
14. The backpack vacuum cleaner according to claim 11, wherein the
high-efficiency filter is further provided with a bottom cover
fixed at the bottom of the support meshes, and the high-efficiency
filter forms a cylindrical structure with an open upper part and a
sealed lower part.
15. The backpack vacuum cleaner according to claim 8, wherein an
upper end of the paper dust bag is provided with a mounting plate
extending radially outward, each of the cloth dust bag and the
high-efficiency filter is fixedly provided with a bezel at an upper
edge, and sealing gaskets are also arranged between the bezel of
the high-efficiency filter and the tank body, and between the bezel
of the high-efficiency filter and the mounting plate of the paper
dust bag.
16. The backpack vacuum cleaner according to claim 1, wherein an
upper edge of the dust collection container and the upper edge of
the high-efficiency filter are clamped and fixed between the tank
cover and the tank body.
17. The backpack vacuum cleaner according to claim 1, further
comprising a back-carrying system arranged on the tank and/or the
housing and a rechargeable battery pack for supplying power to the
vacuum electric fan.
Description
FIELD OF THE INVENTION
[0001] The invention relates to the technical field of cleaning
apparatus, and in particular to a backpack vacuum cleaner.
BACKGROUND OF THE INVENTION
[0002] A traditional backpack vacuum cleaner usually includes a
cleaner main body and a back-carrying device. The cleaner main body
includes a housing, a dust bag and a dust shield (i.e., filter)
arranged in the housing, and a suction motor. An air inlet and an
air outlet are arranged on the housing. The dust bag is arranged
outside the air inlet, the dust shield and the suction motor are
arranged at the air outlet, and the air inlet, the dust bag, the
dust shield, the air outlet and the suction motor are in airflow
communication in sequence. Since the dust shield is arranged at the
air outlet, the dust shield only has an effective filtering area
equal to the cross-sectional area of the air outlet, the filtering
area is small, the filtering efficiency is low, and the user needs
to change the filter frequently to maintain a good cleaning effect.
In addition, since the dust shield and the dust bag are separately
arranged and occupy a certain space inside the housing,
respectively, the dust collection volume of the dust bag is small,
resulting in a relatively high replacement frequency of the dust
bag, and bringing inconvenience for use by the users.
[0003] In addition, after a certain amount of dust is sucked by the
vacuum cleaner, the air flow rate decreases, and the vacuuming
efficiency decreases. Operators cannot feel the change in the
effect immediately, and will continue to vacuum. In the same
working time, the vacuuming efficiency of the vacuum cleaner
decreases, and the workers need to increase the vacuuming time to
meet the requirements of environmental cleaning standards, so
repeated vacuuming will increase a lot of labor costs. Especially
for workplaces with high dust-free requirements or high-risk
nuclear environment, the labor cost will be higher.
SUMMARY OF THE INVENTION
[0004] In order to solve the above technical problems, it is an
object of the present invention to provide a backpack vacuum
cleaner with higher filtering efficiency and vacuuming
efficiency.
[0005] In order to achieve the above purpose of the present
invention, the present invention adopts the following technical
scheme:
[0006] A backpack vacuum cleaner includes:
[0007] a dust collection part including a tank with a dust inlet,
wherein a dust collection container and a high-efficiency filter
are mounted inside the tank, the dust collection container includes
a dust collection bag made of a breathable material, the
high-efficiency filter is cylindrical and sleeved outside the dust
collection bag, and an exhaust space is arranged between the
high-efficiency filter and an inner wall surface of the tank; the
dust inlet, the dust collection bag, the high-efficiency filter and
the exhaust space are sequentially communicated; the tank includes
a tank body with a hollow internal structure and an openable tank
cover mounted on the top of the tank body, and the dust inlet is
arranged on the tank cover; a short air inlet pipe communicated
with the dust inlet is arranged at the bottom of the tank cover and
extends downwards from the dust inlet, and a tail end of the short
air inlet pipe extends into the dust collection bag;
[0008] a base part including a housing adjoining below the tank, an
exhaust port communicated with the outside being arranged on the
housing;
[0009] a vacuum electric fan for introducing dust-containing
airflow into the dust collection bag from the dust inlet and
guiding air entering the exhaust space to the exhaust port;
[0010] an air pressure alarm unit including an air pressure
detection element arranged on the tank and used for detecting the
pressure in the exhaust space and an alarm used for sending an
alarm signal to the outside, wherein the alarm can decide whether
to send an alarm signal to the outside based on a detection result
of the air pressure detection element; the air pressure detection
element includes an air pressure sensor, an air pressure processing
chip and an air pressure sensing switch, the air pressure sensor
detects pressure in the exhaust space and outputs pressure data to
the air pressure processing chip, and the air pressure processing
chip outputs corresponding electrical signals to the air pressure
sensing switch; and the air pressure sensing switch and the alarm
are connected in series in an alarm circuit.
[0011] In the above technical scheme, preferably, the alarm
includes a warning light and/or a buzzer arranged on the
housing.
[0012] In the above technical scheme, preferably, a hook is
arranged on a tank body, a circumferential slot is arranged on an
outer edge of the tank cover, and the tank cover is fixed to an
upper part of the tank body by the hook being clamped in the
slot.
[0013] In the above technical scheme, preferably, a hole
communicated with the exhaust space is formed in a wall of the
tank, and the air pressure detection element is assembled at the
hole.
[0014] In the above technical scheme, preferably, the housing and
the tank are integrally provided.
[0015] In the above technical scheme, preferably, the vacuum
electric fan includes an impeller assembly and a motor for driving
the impeller assembly to rotate to generate a negative pressure.
The motor is arranged in the housing, and the impeller assembly is
arranged in the tank and/or the housing.
[0016] In the above technical scheme, preferably, the
high-efficiency filter has a first vertical centerline extending in
an up-down direction, the dust collection bag has a second vertical
centerline extending in the up-down direction, and the first
vertical centerline coincides with the second vertical
centerline.
[0017] In the above technical scheme, preferably, the dust
collection bag has a double-layer dust bag structure. The dust bag
in an inner layer is a disposable paper dust bag that is easy to
replace, and the dust bag in an outer layer is a cloth dust bag
reusable after cleaning.
[0018] In the above technical scheme, preferably, the cloth dust
bag consists of two surface layers of non-woven fabrics and a
cotton core sandwiched therebetween.
[0019] In the above technical scheme, preferably, the
high-efficiency filter includes a cylindrical filter element which
is circumferentially formed in a pleated and folded manner and a
support member fixed on an outer side and/or an inner side of the
cylindrical filter element.
[0020] In the above technical scheme, preferably, the support
member includes a pair of cylindrical support meshes, and the
cylindrical filter element in a pleated form is sandwiched between
the pair of support meshes.
[0021] In the above technical scheme, preferably, the support
meshes are made of a stretched metal mesh.
[0022] In the above technical scheme, preferably, the support
meshes are edge-sealed and fixed at seams with smooth splicing
strips.
[0023] In the above technical scheme, preferably, the
high-efficiency filter is further provided with a bottom cover
fixed at the bottom of the support meshes, and the high-efficiency
filter forms a cylindrical structure with an open upper part and a
sealed lower part.
[0024] In the above technical scheme, preferably, an upper end of
the paper dust bag is provided with a mounting plate extending
radially outward, each of the cloth dust bag and the
high-efficiency filter is fixedly provided with a bezel at an upper
edge, and sealing gaskets are also arranged between the bezel of
the high-efficiency filter and the tank body, and between the bezel
of the high-efficiency filter and the mounting plate of the paper
dust bag.
[0025] In the above technical scheme, preferably, an upper edge of
the dust collection container and the upper edge of the
high-efficiency filter are clamped and fixed between the tank cover
and the tank body.
[0026] In the above technical scheme, preferably, the backpack
vacuum cleaner further includes a back-carrying system arranged on
the tank and/or the housing and a rechargeable battery pack for
supplying power to the vacuum electric fan.
[0027] The present invention has the beneficial effects that:
[0028] 1. By directly sleeving the high-efficiency filter outside
the dust collection bag, on the one hand, the space utilization
rate is improved through the sleeved structure, so that the
effective filtering area of the high-efficiency filter is increased
by times, thereby improving the air flow rate and prolonging the
service life of the dust collection bag, and on the other hand, the
high-efficiency filter is arranged upstream of the suction motor,
and the air entering the suction motor has been purified, so that a
motor room can be prevented from being polluted.
[0029] 2. By adding the air pressure alarm unit, a worker may set a
working efficiency index of the vacuum cleaner as required (the air
pressure is detected by the air pressure sensor, and a
corresponding program is set inside the air pressure processing
chip and a corresponding conversion into working efficiency index,
for example an air flow rate of 20 L/S, is performed). When a
certain amount of dust is sucked, the air flow rate of the vacuum
cleaner drops to 20 L/S, and the vacuuming efficiency is lower than
a lower limit index required by the worker. Therefore, the air
pressure sensing switch of the vacuum cleaner will start to work
and control the alarm to send out an alarm signal to remind the
worker that the dust bag or filter needs to be replaced in time, so
as to ensure that the vacuum cleaner operates in a high vacuuming
efficiency state, thereby ensuring the working efficiency of the
operators and reducing unnecessary labor waste.
[0030] 3. A short air inlet pipe communicated with the dust inlet
is arranged at the bottom of the tank cover and extends downwards
from the dust inlet, and a tail end of the short air inlet pipe
extends into the dust bag, so that the short air inlet pipe can be
conveniently connected with an external dust suction floor brush
and other accessories, and the connection is more convenient.
Furthermore, the short air inlet pipe is directly communicated with
the dust inlet, so that when the short air inlet pipe is connected
with the external dust suction floor brush and other accessories,
it can be ensure that the dust accurately falls into the dust
collection bag after entering from the dust inlet, and the
vacuuming efficiency is further improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] FIG. 1 is a schematic perspective diagram of a backpack
vacuum cleaner of the present invention, with a back-carrying
system and a rechargeable battery pack omitted;
[0032] FIG. 2 is a schematic cross-sectional diagram of the inside
of a tank of the backpack vacuum cleaner of the present
invention;
[0033] FIG. 3 is a schematic diagram of a sleeved structure of a
tank cover, a paper dust bag, a cloth dust bag and a
high-efficiency filter of the backpack vacuum cleaner of the
present invention;
[0034] FIG. 4 is a schematic front diagram of the high-efficiency
filter of the present invention;
[0035] FIG. 5 is a schematic sectional diagram taken along A-A in
FIG. 4;
[0036] FIG. 6 is an exploded schematic diagram of a dust collection
container and the high-efficiency filter of the present
invention;
[0037] FIG. 7 is a partially enlarged schematic diagram of B shown
in FIG. 1;
[0038] FIG. 8 is a schematic diagram of a circuit structure of an
air pressure alarm unit of the present invention; and
[0039] FIG. 9 is a schematic diagram showing signal flow in an air
pressure detection element of the present invention.
[0040] Reference numerals: 1, dust collection part; 11, tank; 111,
tank body; 1111, hook; 112, tank cover; 1121, slot; 12, dust inlet;
13, air inlet; 14, dust collection container; 15, vacuum electric
fan; 16, dust collection bag; 161, paper dust bag; 1611, mounting
plate; 162, cloth dust bag; 17, high-efficiency filter; 171,
support mesh; 172, bottom cover; 18, motor seat; 19, plug; 20,
sealing gasket; 21, air pressure alarm unit; 211, air pressure
detection element; 2111, air pressure sensor; 2112, air pressure
processing chip; 2113, air pressure sensing switch; 212, alarm; and
22, short air inlet pipe.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0041] In order to explain in detail the technical content,
structural features, achieved objectives and effects of the present
invention, the following will be described in detail in conjunction
with embodiments and accompanying drawings.
[0042] The backpack vacuum cleaner includes a vacuum cleaner main
body and a back-carrying system. The back-carrying system is
fixedly connected with the vacuum cleaner main body, and typically
has a structure including connecting structures such as a back
strap and a shoulder strap, so that a user can carry the vacuum
cleaner main body on the back. The vacuum cleaner has a power
supply system which may be powered by batteries or connected with
an external power supply. This section is the known knowledge and
structure in the prior art, and will not be described in detail
herein.
[0043] As shown in FIGS. 1-2, the vacuum cleaner main body includes
a dust collection part 1, a base part 18, a vacuum electric fan 15
and an air pressure alarm unit 21.
[0044] The dust collection part 1 includes a tank 11 which includes
a tank body 111 with an open upper portion and a tank cover 112
covering the upper portion of the tank body 111. The tank body 111
and the tank cover 112 are connected through a locking structure.
Specifically, a hook 1111 is mounted on the tank body 111, and a
circumferential slot 1121 is arranged at an outer edge of the tank
cover 112. When in use, the tank cover 112 is fixed on an upper
part of the tank body 111 by the hook 1111 being clamped in the
slot 1121, so it is very convenient to assemble and disassemble the
tank cover 112 with the tank body 111.
[0045] A dust inlet 12 is arranged on the tank cover 112. A short
air inlet pipe 22 extending downward from the dust inlet 12 is
provided. The tank body 111 is hollow inside.
[0046] The base part 18 includes a housing adjoining below the tank
11, and an exhaust port communicating with the outside is arranged
on the housing. The housing is integrally provided with the tank
11.
[0047] The vacuum electric fan 15 is used to introduce
dust-containing airflow into the dust collection bag 16 from the
dust inlet 12 and guide air entering an exhaust space to the
exhaust port. The vacuum electric fan is mounted on the base part
18 or in the tank body 111, and the air inlet 13 of the vacuum
electric fan 15 and the dust inlet 12 are on a same axis. The base
part 18 is provided with a plug 19 electrically connected with the
vacuum electric fan 15, and the plug 19 may be electrically
connected with the household commercial power through a
transmission line such as a power strip. In order to facilitate the
user's mobile vacuuming operation, a rechargeable battery pack
electrically connected with the vacuum electric fan 15 may be
arranged on the base part 18 or the back-carrying system instead of
the plug 19. The vacuum electric fan 15 includes an impeller
assembly and a motor which drives the impeller assembly to rotate
to generate a negative pressure. The motor is arranged in the
housing, and the impeller assembly is arranged in the tank 11. Of
course, the impeller assembly may also be entirely arranged in the
housing or partially extend into the tank.
[0048] As shown in FIG. 9, the air pressure alarm unit 21 includes
an air pressure detection element 211 arranged on the tank 11 for
detecting pressure in the exhaust space and an alarm 212 for
sending an alarm signal to the outside. The air pressure detection
element 211 includes an air pressure sensor 2111, an air pressure
processing chip 2112 and an air pressure sensing switch 2113. The
air pressure sensor 2111 detects the pressure in the exhaust space
and outputs pressure data to the air pressure processing chip 2112,
and the air pressure processing chip 2112 outputs corresponding
electrical signals to the air pressure sensor switch 2113. The air
pressure sensing switch 2113 and the alarm 212 are connected in
series in an alarm circuit.
[0049] As shown in FIGS. 3-6, a dust collection container 14 and a
high-efficiency filter 17 are mounted inside the tank 11.
[0050] The dust collection container 14 includes a dust collection
bag 16 made of breathable material. The high-efficiency filter 17
is cylindrical and sleeved outside the dust collection bag 16, and
the exhaust space is arranged between the high-efficiency filter 17
and an inner wall surface of the tank 11. The dust inlet 12, the
dust collection bag 16, the high-efficiency filter 17 and the
exhaust space are sequentially communicated. Specifically, the dust
collection bag 16 has a double-layer dust bag structure. The dust
bag in an inner layer is a disposable paper dust bag 161 that is
easy to replace, and the dust bag in an outer layer is a cloth dust
bag 162 reusable after cleaning. The paper dust bag 161 is usually
a disposable paper bag made of a single-layer non-woven fabric and
discardable after being filled with dust. The cloth dust bag 162 is
a cloth dust bag consisting of two surface layers of non-woven
fabrics and a cotton core sandwiched therebetween, so that the
filtering effect is better. The paper dust bag 161 is sleeved
inside the cloth dust bag 162. An upper end of the paper dust bag
161 is provided with a mounting plate 1611 extending radially
outward. Each of the cloth dust bag 162 and the high-efficiency
filter 17 is fixedly provided with a bezel at an upper edge.
Sealing gaskets 20 are also arranged between the bezel of the
high-efficiency filter 17 and the tank 111, and between the bezel
of the high-efficiency filter 17 and the mounting plate 1611 of the
paper dust bag 161.
[0051] At the same time, in the prior art, the internal filter and
dust collection bag of the vacuum cleaner are separately arranged,
so that such a design will have the problems of large occupied
space and influence on filtering efficiency. In contrast, in this
application, the sleeved structure of the high-efficiency filter 27
and the dust bag enables efficient space utilization and quick
mounting and disassembly, so that the dust collection volume of the
dust bag can be increased to a certain extent and the users do not
need to change the dust collection bag 16 frequently, thereby
meeting the daily use requirements of the users and increasing the
convenience of the users.
[0052] When the dust collection container 14 is mounted by a user,
the high-efficiency filter 17, the cloth dust bag 162 and the paper
dust bag 161 are sequentially mounted on the tank body 111, and
then the tank cover 112 is covered, and the short air inlet pipe 22
of the tank cover is made to extend into an opening of the paper
dust bag 161. After that, the short air inlet pipe 22 and dust
inlet 12 are connected with accessories such as a dust suction
floor brush, the tank cover and the tank body 111 are tightly
locked, and the mounting plate 1611 of the paper dust bag 161 and
the bezels of the dust bag 162 and the high-efficiency filter 17
are tightly pressed and fixed between the tank cover and the tank
body 111.
[0053] The short air inlet pipe 22 communicated with the dust inlet
12 is arranged at the bottom of the tank cover 112 and extends
downward from the dust inlet 12, and a tail end of the short air
inlet pipe 22 extends into the dust collection bag 16, so that the
short air inlet pipe 22 can be conveniently connected with the
external dust suction floor brush and other accessories, and the
connection is more convenient. Furthermore, the short air inlet
pipe 22 is directly communicated with the dust inlet 12, so that
when the short air inlet pipe is connected with the external dust
suction floor brush and other accessories, it can be ensured that
the dust accurately falls into the dust collection bag 16 after
entering from the dust inlet 12, and the vacuuming efficiency is
further improved.
[0054] The high-efficiency filter 17 is sleeved on an outer
peripheral side of the cloth dust bag 162. In this embodiment, the
paper dust bag 162, the cloth dust bag 161 and the high-efficiency
filter 17 are all cylindrical. The high-efficiency filter 17 has a
first vertical centerline extending in an up-down direction, and
the dust collection bag 16 has a second vertical centerline
extending in the up-down direction, with the first vertical
centerline coinciding with the second vertical centerline.
Therefore, the effective filtering area of the high-efficiency
filter 17 can be significantly increased, resulting in an improved
filtering efficiency and cleaning effect.
[0055] The high-efficiency filter 17 includes a cylindrical filter
element which is circumferentially formed in a pleated and folded
manner and a support member fixed on an inner side of the
cylindrical filter element. Specifically, the high-efficiency
filter 17 is of a cylindrical structure with an open upper part and
a sealed lower part. The supporting part includes a pair of
cylindrical support meshes 171 each is formed by a stretched metal
mesh that is butted into its self to form a cylindrical support
structure. A bottom cover 172 is fixed at lower parts of the
support meshes, and the cylindrical filter element in a pleated
form is sandwiched between the pair of support meshes 171. That is,
the pleated and folded filter element of the high efficiency
particulate air filter (HEPA) is placed in a gap between the pair
of support meshes. The pleated and folded filter element can
maximize the filtering area and disperse dust. In order to prevent
sharp burrs or bulges from being formed at seams of the stretched
metal meshes to scratch the high-efficiency filter element or
fingers of the users, the support meshes are edge-sealed and fixed
at the seams with smooth plastic splicing strips. Of course, in
other embodiments, the support member may also be arranged on an
outer side of the cylindrical filter element, or both the inner and
outer sides may be provided with support members to increase the
support strength.
[0056] In operation, the dust-containing airflow enters the vacuum
cleaner main body through the dust inlet 12 under the suction force
of the vacuum electric fan 15. After the dust-containing airflow
passes through the paper dust bag 161 and the cloth dust bag 162 in
turn, most dust particles are collected in the paper dust bag 161,
some fine dust is collected by the cloth dust bag 162, and a small
amount of finer dust is collected by the high-efficiency filter 17.
Finally, the filtered clean air is discharged from the air inlet 13
of the motor to the outside of the vacuum cleaner main body 1
through the air outlet after passing through a motor chamber. The
paper dust bag 161, as a disposable article, may be discarded after
being filled with dust. The cloth dust bag may be cleaned or
replaced regularly. Thus, the high-efficiency filter in this
utility model has a longer replacement period and can be used for a
long time due to its significantly increased effective contact
area.
[0057] In order to have a better filtering effect and improve the
filtering effect of the high-efficiency filter, in other
embodiments of the utility model, the high-efficiency filter may
also be designed into a multi-layer filtering structure, or the
bottom cover of the high-efficiency filter may be designed into the
same filtering structure as its outer peripheral side wall, that
is, the bottom cover of the high-efficiency filter can also be
provided with a pleated high-efficiency filter element.
[0058] It should be noted that the dust filtering structure in the
backpack vacuum cleaner described above, that is, the structure
composed of the paper dust bag 162, the cloth dust bag 161 and the
high-efficiency filter 17 sleeved outside the cloth dust bag 161,
may also be applied to ordinary vacuum cleaners, such as hand-held
vacuum cleaners or horizontal vacuum cleaners.
[0059] As shown in FIG. 1 and FIGS. 7-8, the alarm 212 includes a
warning light and a buzzer arranged on the housing. A hole
communicated with the exhaust space is formed in a wall of the tank
11, and the air pressure detection element 211 is mounted at the
hole. The air pressure detection element 211 includes an air
pressure sensor 2111, an air pressure processing chip 2112 and an
air pressure sensing switch 2113. The air pressure sensor 2111
detects pressure in the exhaust space and outputs pressure data to
the air pressure processing chip 2112, and the air pressure
processing chip 2112 outputs corresponding electrical signals to
the air pressure sensor switch 2113. The air pressure sensing
switch 2113 and the alarm 212 are connected in series in an alarm
circuit. By adding the air pressure alarm unit 212, a worker may
set a working efficiency index of the vacuum cleaner as required
(the air pressure is detected by the air pressure sensor 2111, and
a corresponding program is set inside the air pressure processing
chip 2112 and a corresponding conversion into working efficiency
index, for example an air flow rate of 20 L/S, is performed). When
a certain amount of dust is sucked, the air flow rate of the vacuum
cleaner drops to 20 L/S, and the vacuuming efficiency is lower than
a lower limit index required by the worker. Therefore, the air
pressure sensing switch 2113 of the vacuum cleaner will start to
work and control the alarm 212 to send out an alarm signal to
remind the worker that the dust bag or filter needs to be replaced
in time, so as to ensure that the vacuum cleaner operates in a high
vacuuming efficiency state, thereby ensuring the working efficiency
of the operators and reducing unnecessary labor waste.
[0060] The above embodiments are merely used for illustrating the
technical concept and features of the present invention, and are
intended to allow a person skilled in the art to understand the
contents of the present invention and implement it accordingly, but
not to limit the scope of protection of the present invention. All
equivalent changes or modifications made according to the spirit of
the present invention should be covered by the protection scope of
the present invention.
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