BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] The present invention relates generally to a series fan, and more particularly to
a series fan in which two dynamic blades are connected to form a driving blade in
the form of a continuous blade so as to enhance the wind pressure of the series fan.
2. Description of the Related Art
[0002] Along with the advance of sciences and technologies, the reliance of peoples on various
electronic devices has been more and more increased. However, in operation, the internal
components of the electronic devices (such as computers and notebooks) will generate
high heat. The heat must be conducted out of the electronic devices in time. Otherwise,
the internal components will be over-heated. Therefore, in most of the electronic
devices, a cooling fan is often employed to actively dissipate the heat so as to keep
the electronic products working within a certain operation temperature range. However,
sometimes one single cooling fan can hardly provide sufficient wind force. Therefore,
two or more fans are often serially assembled to form a series fan so as to provide
sufficient wind force.
[0003] US2015/226222 A1 describes a conventional series fan, a front fan and a rear fan are serially connected.
The main components of the series fan include pre-dynamic blades, pre-static blades,
post-static blades and post-dynamic blades, which are sequentially arranged from the
wind incoming opening to the wind outgoing opening. The pre-static blades of the front
fan and the post-static blades of the rear fan serve as best support components for
the series fan. However, the pre-static blades of the front fan and the post-static
blades of the rear fan are positioned in the middle of the series fan. Therefore,
the structural supportability of the series fan in the position of the pre-dynamic
blades of the front fan and the post-dynamic blades of the rear fan is relatively
weak. That is, the structural supportability of the series fan at the wind incoming
opening and the wind outgoing opening is weaker.
[0004] When the conventional series fan is fixed in the electronic device, the electronic
device is assembled with the wind incoming opening or wind outgoing opening of the
series fan. However, the pre-dynamic blades and the post-dynamic blades at the wind
incoming opening and the wind outgoing opening are not supported by any support structure.
In this case, the vibration value of the entire series fan is often increased to affect
the stability of the system of the entire series fan.
[0005] Moreover, the pre-dynamic blades and the post-dynamic blades at the wind incoming
opening and the wind outgoing opening are in an open state. In consideration of security,
a protection web is often additionally mounted in the positions of the wind incoming
opening and the wind outgoing opening of the series fan to achieve protection effect.
This causes increase of cost of material and working time of the entire series fan.
[0006] Furthermore, when the conventional series fan is disposed in the electronic device,
the corresponding installation height of the series fan is fixed and limited. Therefore,
the total thickness of the series fan is limited. That is, the design of the dynamic
and static blades of the series fan is limited by the arrangement of the middle motors
and the pre-dynamic blades and the post-dynamic blades of the front and rear fans
so that the total height and size of the series fan are designed in a fixed proportion.
Relatively, the pre-dynamic blades and the post-dynamic blades have fixed sizes and
proportions. In addition, the pre-dynamic blades and the post-dynamic blades are limited
by the fixed sizes and arrangement of the intermediate components, (that is, the pre-static
blades and the post-static blades) so that the pre-dynamic blades and the post-dynamic
blades can only independently rotate as two separate components and cannot be made
in the form of one single continuous blade. As a result, when the pre-dynamic blades
and the post-dynamic blades with fixed sizes respectively pressurize the airflow flowing
into the series fan, before the airflow is pressurized, the airflow is thrown out
by the respective blades, (that is, the pre-dynamic blades and the post-dynamic blades).
Therefore, the pressurizing time of the pre-dynamic blades and the post-dynamic blades
for the airflow flowing into the series fan is too short so that the wind pressure
of the entire series fan cannot be effectively enhanced.
[0007] US 2004/219022 A1 describes an assembled type impeller of a cooling fan comprising a main impeller
having a hub and a plurality of main blades on an outer side of the hub and a "n"shaped
extension portion next to one end of the hub thereof and a secondary impeller having
a plurality of secondary blades on an outer side of a hub, the secondary impeller
being joined to the main impeller being closely fitted onto the extension portion
with the secondary blades being connected to respective ones of the main blades to
form larger blades. Thus, both seats are mounted on the same side of the frame.
[0008] JP5610008 B2 describes a projector with an axial flow fan with blades. The frame body 63 of the
impeller 6, 61 is located in the middle between an inlet frame body 51 and an outlet
frame body 52 respectively.
[0009] EP 3 708 842 A1 describes a fan and air conditioner indoor unit with a first and a second wind wheel.
SUMMARY OF THE INVENTION
[0010] It is therefore a primary object of the present invention to provide a series fan,
which has enhanced wind pressure effect.
[0011] To achieve the above and other objects, the series fan of the present invention includes
a first fan and a second fan. The first fan includes a first frame body, a first dynamic
blade impeller and a first shaft seat. Two sides of the first frame body are respectively
formed with a wind incoming side and a connection side. The first shaft seat is disposed
at a center of the wind incoming side. A first static blade is disposed between the
first shaft seat and inner circumference of the first frame body. The first dynamic
blade impeller is pivotally disposed on the first shaft seat and has multiple first
dynamic blades. Each first dynamic blade has at least one connection section. The
second fan includes a second frame body, a second dynamic blade impeller and a second
shaft seat. Two sides of the second frame body are respectively formed with a wind
outgoing side and a mating side mated with the connection side in communication therewith.
The second shaft seat is disposed at a center of the wind outgoing side. A second
static blade is disposed between the second shaft seat and inner circumference of
the second frame body. The second dynamic blade impeller is pivotally disposed on
the second shaft seat and has multiple second dynamic blades. Each second dynamic
blade has at least one connected section. The connected section of the second dynamic
blade is connected with the connection section of the first dynamic blade to form
integrally a driving blade. The first fan is upside-down placed on the second fan
and serially reverse-connected with the second fan. By means of the above design of
the series fan of the present invention, the wind pressure of the entire series fan
is effectively enhanced.
[0012] In the above series fan, the connection side has a first opening. The first dynamic
blade impeller has a first hub and a first shaft. One end of the first shaft is fixedly
disposed at a center of the first hub. The other end of the first shaft is pivotally
disposed in the first shaft seat. The multiple first dynamic blades are radially disposed
along outer circumference of the first hub. Each first dynamic blade has a blade front
edge and a blade tail edge. The connection section is disposed on the blade front
edge. The blade front edge is protruded from, recessed into or flush with the first
opening. The blade tail edge is positioned in the wind incoming side.
[0013] In the above series fan, the mating side has a second opening in communication with
the first opening. The second dynamic blade impeller has a second hub and a second
shaft. One end of the second shaft is fixedly disposed at a center of the second hub.
The other end of the second shaft is pivotally disposed in the second shaft seat.
The multiple second dynamic blades are radially disposed along outer circumference
of the second hub. Each second dynamic blade has a blade front edge and a blade tail
edge. The connected section is disposed on the blade front edge of the second dynamic
blade. The blade front edge of the second dynamic blade is protruded from the second
opening into the first opening, flush with the second opening or recessed into the
second opening. The blade tail edge of the second dynamic blade is positioned in the
wind outgoing side.
[0014] In the above series fan, each first dynamic blade has a first upper surface and a
first lower surface and each second dynamic blade has a second upper surface and a
second lower surface. The first upper surface is connected with the second upper surface
to form a continuous upper surface. The first lower surface is connected with the
second lower surface to form a continuous lower surface.
[0015] In the above series fan, the connection section and the connected section are raised
structure and recessed structure in adaptation to the raised structure or any other
connection structures in adaptation to each other, such as recessed structure and
raised structure in adaptation to the recessed structure, screw structures, insertion
structures, adhesion structures or welding structures.
[0016] In the above series fan, the connection side of the first frame body is mated with
the mating side of the second frame body by means of engagement, locking, insertion,
adhesion, slide rail or latching.
[0017] In the above series fan, the connection side has a first opening. A first flow way
is defined between the wind incoming side and the first opening. The first flow way
is in communication with the wind incoming side and the first opening.
[0018] In the above series fan, the mating side has a second opening in communication with
the first opening. A second flow way is defined between the wind outgoing side and
the second opening. The second flow way is in communication with the wind outgoing
side and the second opening. The first and second flow ways are in communication with
each other to together form an airflow guide passage. The driving blade is positioned
in the airflow guide passage.
[0019] In the above series fan, the first dynamic blade impeller and the second dynamic
blade impeller are formed integrally by means of injection molding.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The structure and the technical means adopted by the present invention to achieve
the above and other objects can be best understood by referring to the following detailed
description of the preferred embodiments and the accompanying drawings, wherein:
Fig. 1 is a perspective exploded view of a preferred embodiment of the present invention;
Fig. 2A is a perspective assembled view of the preferred embodiment of the present
invention;
Fig. 2B is a sectional view of the preferred embodiment of the present invention,
showing that the airflow is continuously pressurized by the driving blades; and
Fig. 3 is a perspective view of the preferred embodiment of the present invention,
showing the connection form of the connection section and the connected section, in
which the connection section and the connected section are raised structure and recessed
structure in adaptation to the raised structure.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] Please refer to Figs. 1, 2A and 2B. The series fan 1 of the present invention includes
a first fan 11 and a second fan 21. The first fan 11 includes a first frame body 111,
a first dynamic blade impeller 13 and a first shaft seat 15. Two sides of the first
frame body 111 are respectively formed with a wind incoming side 1111 and a connection
side 1113. The connection side 1113 has a first opening 1114. The first opening 1114
and the wind incoming side 1111 define therebetween a first flow way 12 in communication
with the wind incoming side 1111 and the first opening 1114. The wind incoming side
1111 serves to guide external airflow 4 to flow into the first flow way 12 of the
first frame body 111. The airflow is then guided out by the first opening 1114 to
flow into the second fan 21.
[0022] The first shaft seat 15 is disposed at the center of the wind incoming side 1111.
A first static blade 16 is disposed between the first shaft seat 15 and inner circumference
of the first frame body 111. The first static blade 16 is positioned at the wind incoming
side 1111. In this embodiment, the first static blade 16 is a rib. Two ends of the
first static blade 16 are, but not limited to, respectively connected with outer circumference
of the first shaft seat 15 and the inner circumference of the first frame body 111
for illustration purposes. In practice, the first static blade 16 can be a blade.
The first dynamic blade impeller 13 is pivotally disposed on the first shaft seat
15 and positioned in the first flow way 12. The first dynamic blade impeller 13 has
multiple first dynamic blades 131, a first hub 132, a stator 17 and a first shaft
133. One end of the first shaft 133 is fixedly disposed at the center of the first
hub 132. The other end of the first shaft 133 is pivotally disposed in the first shaft
seat 15. The multiple first dynamic blades 131 are radially disposed along outer circumference
of the first hub 132. The stator 17 of the first dynamic blade impeller 13 is fitted
around a bearing cup of the first shaft seat 15. A magnetic member 18 (such as a magnet)
is disposed on inner circumference of the first hub 132. The stator 17 and the magnetic
member 18 are magnetized with each other by induction.
[0023] Each first dynamic blade 131 has a blade front edge 1313, a blade tail edge 1314,
a first upper surface 1315, a first lower surface 1316 and at least one connection
section 1311. The blade front edge 1313 and the blade tail edge 1314 of the first
dynamic blade 131 are respectively positioned in the first opening 1114 of the connection
side 1113 and the wind incoming side 1111. The blade front edge 1313 can be selectively
protruded from, recessed into or flush with the first opening 1114. The connection
section 1311 is disposed on the blade front edge 1313 of the first dynamic blade 131.
[0024] The second fan 21 includes a second frame body 211, a second dynamic blade impeller
23 and a second shaft seat 25. Two sides of the second frame body 211 are respectively
formed with a wind outgoing side 2111 and a mating side 2113. The mating side 2113
is mated with the connection side 1113 in communication therewith. The connection
side 1113 of the first frame body 111 is mated with the mating side 2113 of the second
frame body 211 by means of engagement, locking, insertion, adhesion, slide rail or
latching, whereby the first fan 11 is upside-down placed on the second fan and serially
reverse-connected with the second fan 21 to form the series fan 1.
[0025] The mating side 2113 has a second opening 2114. The second opening 2114 serves to
further guide the airflow flowing from the first opening 1114, whereby the airflow
can continuously flow. The second opening 2114 and the wind outgoing side 2111 define
therebetween a second flow way 22 in communication with the wind outgoing side 2111
and the first and second openings 1114, 2114. The first and second flow ways 12, 22
communicate with each other to together form an airflow guide passage.
[0026] The wind outgoing side 2111 serves to discharge the airflow 4, which is boosted (pressurized)
in the airflow guide passage so as to forcedly dissipate the heat generated by a heat
generation component (such as a central processing unit or graphics processing unit).
[0027] The second shaft seat 25 is disposed at the center of the wind outgoing side 2111.
A second static blade 26 is disposed between the second shaft seat 25 and inner circumference
of the second frame body 211. In this embodiment, the second static blade 26 is a
rib positioned at the wind outgoing side 2111. Two ends of the second static blade
26 are, but not limited to, respectively connected with outer circumference of the
second shaft seat 25 and the inner circumference of the second frame body 211. In
practice, the first and second static blades 16, 26 can be adjusted into same structure
(such as both are ribs) or different structures (such as one is a rib, while the other
is a static blade) according to the design requirement of the boosting or entire supportability
of the series fan 1. The first and second static blades 16, 26 are respectively disposed
in the wind incoming side 1111 and the wind outgoing side 2111 of the series fan 1
so that the supporting strength of the entire structure of the series fan 1 is effectively
enhanced. Also, the vibration of the entire series fan 1 can be avoided. Moreover,
the first and second static blades 16, 26 serve to shield and protect the first and
second dynamic blade impellers 13, 23 so as to effectively improve the shortcoming
of the conventional series fan that a protection web must be additionally arranged
to cause increase of cost of material and working time.
[0028] The second dynamic blade impeller 23 is pivotally disposed on the second shaft seat
25 and positioned in the second flow way 22. The second dynamic blade impeller 23
has multiple second dynamic blades 231, a second hub 232, a stator 27 and a second
shaft (not shown). One end of the second shaft is fixedly disposed at the center of
the second hub 232. The other end of the second shaft is pivotally disposed in the
second shaft seat 25. The stator 17 is fitted around a bearing cup of the second shaft
seat 25. A magnetic member (such as a magnet, not shown) is disposed on inner circumference
of the second hub 232. The stator 17 and the magnetic member are magnetized with each
other by induction. The first hub 132 and the second hub 232 are upside-down arranged.
[0029] The multiple second dynamic blades 231 are radially disposed along outer circumference
of the second hub 232. Each second dynamic blade 231 has a blade front edge 2313,
a blade tail edge 2314, a second upper surface 2315, at least one connected section
2311 and a second lower surface 2316. The blade front edge 2313 and the blade tail
edge 2314 are respectively positioned in the second opening 2114 of the mating side
2113 and the wind outgoing side 2111. The blade front edge 2313 of the second dynamic
blade 231 can be selectively protruded from the second opening 2114 into the first
opening 1114 or flush with (or recessed into) the second opening 2114. The connected
section 2311 is disposed on the blade front edge 2313 of the second dynamic blade
231. In this embodiment, the connection section 1311 of the first dynamic blade 131
and the connected section 2311 of the second dynamic blade 231 are raised structure
and recessed structure in adaptation to the raised structure for illustration purposes.
That is, the connection section 1311 of the first dynamic blade 131 is a boss body,
while the connected section 2311 of the second dynamic blade 231 is a dent, which
is connected with the boss body. Accordingly, the connection sections 1311 of the
multiple first dynamic blades 131 and the connected sections 2311 of the multiple
second dynamic blades 231 are connected to form integrally multiple driving blades
31 in a continuous blade form. In addition, the first upper surface 1315 is connected
with the second upper surface 2315 without any gap in the junction between the first
upper surface 1315 and the second upper surface 2315 so as to form a continuous upper
surface. The first lower surface 1316 is connected with the second lower surface 2316
without any gap in the junction between the first lower surface 1316 and the second
lower surface 2316 so as to form a continuous lower surface.
[0030] Please refer to Figs. 1 and 2B. When the series fan 1 operates, the first and second
dynamic blade impellers 13, 23 will synchronously rotate. The multiple driving blades
31 in the continuous blade form in the airflow guide passage will guide the external
airflow 4 to axially pass through the wind incoming side 1111 into the first flow
way 12 of the airflow guide passage. After the airflow 4 is guided in by the blade
tail edges 1314 of the first dynamic blades 131 of the multiple driving blades 31,
the multiple first dynamic blades 131 will pressurize the airflow 4 to flow along
the first upper surfaces 1315 in a direction to the blade front edges 1313. At this
time, the pressurized airflow 4 flows to the blade front edges 1313 of the first dynamic
blades 131 to further continuously flow to the second upper surface 2315, whereby
the second dynamic blades 231 in the second flow way 22 further pressurizes the airflow
4. The further pressurized airflow 4 flows along the second upper surfaces 2315 in
a direction to the blade tail edges 1314. Then the airflow 4 is downward thrown out
(flow out) at a certain speed to pass through the second static blade 26 to outer
side of the wind outgoing side 2111.
[0031] In another embodiment, the connection section 1311 and the connected section 2311
are selected from a group consisting of raised structure and recessed structure in
adaptation to the raised structure (as shown in Fig. 3), screw structures, insertion
structures, adhesion structures and welding structures (connected by means of welding).
[0032] In a modified embodiment, the first hub 132 of the first dynamic blade impeller 13
and the multiple first dynamic blades 131 thereon and the second hub 232 of the second
dynamic blade impeller 23 and the multiple second dynamic blades 231 thereon are formed
integrally by means of injection molding.
[0033] According to the above design, the multiple first and second dynamic blades 131,
231 of the series fan 1 of the present invention are connected to form integrally
multiple driving blades 31 in a continuous blade form. In this case, the airflow 4
can be continuously pressurized by the first and second dynamic blades 131, 231 of
the multiple driving blades 31 in the airflow guide passage so as to effectively greatly
enhance the wind pressure of the entire series fan 1.
[0034] The present invention has been described with the above embodiments thereof and it
is understood that many changes and modifications in such as the form or layout pattern
or practicing step of the above embodiments can be carried out without departing from
the scope and the spirit of the invention that is intended to be limited only by the
appended claims.
1. A series fan (1) comprising:
a first fan (11) including a first frame body (111), a first dynamic blade impeller
(13) and a first shaft seat (15), two sides of the first frame body (111) being respectively
formed with a wind incoming side (1111) and a connection side (1113), the first shaft
seat (15) being disposed at a center of the wind incoming side (1111), a first static
blade (16) being disposed between the first shaft seat (15) and inner circumference
of the first frame body (111), the first dynamic blade impeller (13) being pivotally
disposed on the first shaft seat (15), the first dynamic blade impeller (13) having
multiple first dynamic blades (131),
a second fan (21) including a second frame body (211), a second dynamic blade impeller
(23) and a second shaft seat (25), two sides of the second frame body being (211)
respectively formed with a wind outgoing side (2111) and a mating side (2113), the
mating side (2113) being mated with the connection side (1113) in communication therewith,
the second shaft seat (25) being disposed at a center of the wind outgoing side (2111),
a second static blade (26) being disposed between the second shaft seat (25) and inner
circumference of the second frame body, the second dynamic blade impeller (23) being
pivotally disposed on the second shaft seat (25), the second dynamic blade impeller
(23) having multiple second dynamic blades (231), characterized in that
each first dynamic blade (131) having at least one connection section (1311); and
each second dynamic blade (231) having at least one connected section (2311), the
connected section (2311) of the second dynamic blade (231) being connected with the
connection section (1311) of the first dynamic blade (131) to form integrally a driving
blade (31), the first fan (11) being upside-down placed on the second fan (21) and
thus serially reverse-connected with the second fan (21).
2. The series fan (1) as claimed in claim 1, wherein the connection side has a first
opening (1114), the first dynamic blade impeller having a first hub (132) and a first
shaft, one end of the first shaft being fixedly disposed at a center of the first
hub (132), the other end of the first shaft being pivotally disposed in the first
shaft seat, the multiple first dynamic blades being radially disposed along outer
circumference of the first hub, each first dynamic blade having a blade front edge
(1313) and a blade tail edge (1314), the connection section being disposed on the
blade front edge (1313), the blade front edge (1313) being protruded from, recessed
into or flush with the first opening (1114), the blade tail edge (1314) being positioned
in the wind incoming side (1111).
3. The series fan (1) as claimed in claim 2, wherein the mating side has a second opening
(2114) in communication with the first opening (1114), the second dynamic blade impeller
having a second hub and a second shaft, one end of the second shaft being fixedly
disposed at a center of the second hub (232), the other end of the second shaft being
pivotally disposed in the second shaft seat, the multiple second dynamic blades being
radially disposed along outer circumference of the second hub (232), each second dynamic
blade having a blade front edge (2313) and a blade tail edge (2314), the connected
section being disposed on the blade front edge (2313) of the second dynamic blade,
the blade front edge (2313) of the second dynamic blade being protruded from the second
opening (2114) into the first opening (1114), flush with the second opening (2114)
or recessed into the second opening (2114), the blade tail edge (2314) of the second
dynamic blade being positioned in the wind outgoing side.
4. The series fan (1) as claimed in claim 1, wherein each first dynamic blade has a first
upper surface (131) and a first lower surface (1316) and each second dynamic blade
has a second upper surface (2316) and a second lower surface (2316), the first upper
surface (1315) being connected with the second upper surface (2315) to form a continuous
upper surface, the first lower surface (1316) being connected with the second lower
surface (2316) to form a continuous lower surface.
5. The series fan (1) as claimed in claim 1, wherein the connection section and the connected
section are selected from a group consisting of raised structure and recessed structure
in adaptation to the raised structure, recessed structure and raised structure in
adaptation to the recessed structure, screw structures, insertion structures and adhesion
structures.
6. The series fan (1) as claimed in claim 1, wherein the connection section and the connected
section are connected with each other by means of welding.
7. The series fan (1) as claimed in claim 1, wherein the connection side of the first
frame body is mated with the mating side of the second frame body by means of engagement,
locking, insertion, adhesion, slide rail or latching.
8. The series fan (1) as claimed in claim 1, wherein the connection side has a first
opening, a first flow way being defined between the wind incoming (1111) side and
the first opening, the first flow way being in communication with the wind incoming
side (1111) and the first opening.
9. The series fan (1) as claimed in claim 8, wherein the mating side has a second opening
(2114) in communication with the first opening, a second flow way being defined between
the wind outgoing side and the second opening (2114), the second flow way being in
communication with the wind outgoing side and the second opening (2114), the first
and second flow ways being in communication with each other to together form an airflow
guide passage, the driving blade (31) being positioned in the airflow guide passage.
10. The series fan (1) as claimed in claim 1, wherein the first dynamic blade impeller
and the second dynamic blade impeller are formed integrally by means of injection
molding.