U.S. patent application number 16/708437 was filed with the patent office on 2020-06-18 for motor rotor for water pump, water pump, and pool circulation system.
The applicant listed for this patent is BESTWAY INFLATABLES & MATERIAL CORP.. Invention is credited to Shuiyong Huang, Haijun Wang, Jinnian Wang, Jiang Xu.
Application Number | 20200191164 16/708437 |
Document ID | / |
Family ID | 70987011 |
Filed Date | 2020-06-18 |
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United States Patent
Application |
20200191164 |
Kind Code |
A1 |
Huang; Shuiyong ; et
al. |
June 18, 2020 |
MOTOR ROTOR FOR WATER PUMP, WATER PUMP, AND POOL CIRCULATION
SYSTEM
Abstract
A motor rotor for a water pump, a water pump, and a pool
circulation system are provided. The motor rotor comprises a hollow
rotatable shaft having a first injection-molded part, and a magnet
disposed circumferentially around a portion of the first
injection-molded part. The first injection-molded part extends
through an entire axial length of the magnet. The motor rotor also
comprises an impeller integrally formed with the first
injection-molded part, the impeller being located at an axial end
of the hollow rotatable shaft. The motor rotor further comprises a
shaft sleeve having a tubular shape located in the hollow rotatable
shaft and extending substantially the entire axial length of the
hollow rotatable shaft. The water pump has a simple structure, is
easy to assemble, is less prone to generating noise during
operation, and has a long service life.
Inventors: |
Huang; Shuiyong; (Shanghai,
CN) ; Wang; Jinnian; (Shanghai, CN) ; Wang;
Haijun; (Shanghai, CN) ; Xu; Jiang; (Shanghai,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BESTWAY INFLATABLES & MATERIAL CORP. |
Shanghai |
|
CN |
|
|
Family ID: |
70987011 |
Appl. No.: |
16/708437 |
Filed: |
December 10, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04D 29/4293 20130101;
E04H 4/129 20130101; F04D 13/064 20130101; F04D 29/026 20130101;
F04D 29/20 20130101; E04H 4/12 20130101; F04D 29/043 20130101; F04D
13/06 20130101; F04D 29/586 20130101 |
International
Class: |
F04D 29/58 20060101
F04D029/58; F04D 13/06 20060101 F04D013/06; F04D 29/20 20060101
F04D029/20; F04D 29/42 20060101 F04D029/42; E04H 4/12 20060101
E04H004/12 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 17, 2018 |
CN |
201822114202.5 |
Aug 1, 2019 |
CN |
201921231450.6 |
Claims
1. A motor rotor for a water pump, comprising: a hollow rotatable
shaft having a first injection-molded part; a magnet having an
axial length and being disposed circumferentially around a portion
of the first injection-molded part, wherein the portion of the
first injection-molded part extends through the entire axial length
of the magnet; and an impeller integrally formed with the first
injection-molded part, said impeller being located at an axial end
of the hollow rotatable shaft.
2. The motor rotor for a water pump of claim 1, wherein the motor
rotor further comprises a shaft sleeve having a tubular shape,
wherein the shaft sleeve is located in the hollow rotatable shaft
at the axial end thereof.
3. The motor rotor for a water pump of claim 1, wherein the motor
rotor further comprises two shaft sleeves, wherein each shaft
sleeve has a tubular shape, with one of the two shaft sleeves being
located in the hollow rotatable shaft at the axial end thereof and
the other of the two shaft sleeves being located in the hollow
rotatable shaft at an opposing axial end thereof.
4. The motor rotor for a water pump of claim 1, wherein the motor
rotor further comprises a shaft sleeve having a tubular shape,
wherein the shaft sleeve is located in the hollow rotatable shaft
and extends for a distance comprising at least half of the entire
axial length of the hollow rotatable shaft.
5. The motor rotor for a water pump of claim 4, wherein the shaft
sleeve extends substantially the entire axial length of the hollow
rotatable shaft.
6. The motor rotor for a water pump of claim 1, wherein the hollow
rotatable shaft further comprises: a second injection-molded part
extending around the first injection-molded part and over part of
an axial length of the first injection-molded part, wherein the
second injection-molded part cooperates with the first
injection-molded part to fixedly clamp the magnet between the first
injection-molded part and the second injection-molded part.
7. The motor rotor for a water pump of claim 6, wherein the motor
rotor further comprises two shaft sleeves, wherein each shaft
sleeve has a tubular shape, with one of the two shaft sleeves being
located in the hollow rotatable shaft at the axial end thereof and
the other of the two shaft sleeves being located in the hollow
rotatable shaft at an opposing axial end thereof.
8. The motor rotor for a water pump of claim 6, wherein the motor
rotor further comprises a shaft sleeve having a tubular shape,
wherein the shaft sleeve is located in the hollow rotatable shaft
and extends for a distance comprising at least half of the entire
axial length of the hollow rotatable shaft.
9. The motor rotor for a water pump of claim 8, wherein the shaft
sleeve extends substantially the entire axial length of the hollow
rotatable shaft.
10. A water pump, comprising a housing, which comprises a first
chamber and a second chamber, with a fixing rod being provided in
the first chamber, wherein the water pump further comprises: the
motor rotor of claim 1, wherein the hollow rotatable shaft of the
motor rotor is mounted in the first chamber by being sheathed on
the fixing rod; a pump cover defining a water inlet, a water
outlet, and a mounting flange configured to engage a mounting end
face of the housing to confine a drainage chamber accommodating the
impeller; and a motor stator located in the second chamber, wherein
the motor stator generates a magnetic field which passes through a
pump wall between the first chamber and the second chamber to drive
the motor rotor.
11. The water pump of claim 10, wherein the pump cover has a recess
to receive an end, passing through the drainage chamber, of the
fixing rod; and the water pump further comprises a sealing cap
located in the recess and covering the end of the fixing rod.
12. The water pump of claim 11, wherein the water pump further
comprises a wear pad which is sheathed on the fixing rod and is
located between the sealing cap and the motor rotor.
13. The water pump of claim 10, wherein the mounting end face of
the housing has an annular groove which faces the mounting flange
of the pump cover, and the water pump further comprises a seal ring
which is provided in the annular groove and is attached to the
mounting flange.
14. The water pump of claim 10, wherein the motor stator comprises
a winding bobbin provided in the second chamber, a silicon steel
sheet provided on the winding bobbin, and an insulating sheet
provided on the silicon steel sheet.
15. A water pump, comprising a housing, which comprises a first
chamber and a second chamber, with a fixing rod being provided in
the first chamber, wherein the water pump further comprises: the
motor rotor of claim 6, wherein the hollow rotatable shaft of the
motor rotor is mounted in the first chamber by being sheathed on
the fixing rod; a pump cover defining a water inlet, a water
outlet, and a mounting flange configured to engage a mounting end
face of the housing to confine a drainage chamber accommodating the
impeller; and a motor stator located in the second chamber, wherein
the motor stator generates a magnetic field which passes through a
pump wall between the first chamber and the second chamber to drive
the motor rotor.
16. The water pump of claim 15, wherein the pump cover has a recess
to receive an end, passing through the drainage chamber, of the
fixing rod; and the water pump further comprises a sealing cap
located in the recess and covering the end of the fixing rod.
17. The water pump of claim 16, wherein the water pump further
comprises a wear pad which is sheathed on the fixing rod and is
located between the sealing cap and the motor rotor.
18. The water pump of claim 15, wherein the mounting end face of
the housing has an annular groove which faces the mounting flange
of the pump cover, and the water pump further comprises a seal ring
which is provided in the annular groove and is attached to the
mounting flange.
19. The water pump of claim 15, wherein the motor stator comprises
a winding bobbin provided in the second chamber, a silicon steel
sheet provided on the winding bobbin, and an insulating sheet
provided on the silicon steel sheet.
20. A pool circulation system, comprising: the water pump of claim
10; a water inlet pipeline configured to provide fluid
communication between a water injection region of a pool and the
water inlet of the water pump; a heater having a water inlet in
fluid communication with the water outlet of the water pump; and a
water outlet pipeline in fluid communication between a water outlet
of the heater and the water injection region of the pool.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This utility patent application claims the benefit of
Chinese patent application CN 201822114202.5, filed Dec. 17, 2018
and Chinese patent application CN 201921231450.6, filed Aug. 1,
2019, the full content of both of which are herein incorporated by
reference.
TECHNICAL FIELD
[0002] The present disclosure relates to the technical field of
water pumps. More specifically, the present disclosure relates to a
motor rotor for a water pump. The present disclosure further
relates to a water pump comprising a motor rotor and a pool
circulation system comprising the water pump.
BACKGROUND
[0003] Most swimming pools are equipped with a circulation system
in communication with a water injection region of the pool for
heating water in the pool. The circulation system typically
comprises a water inlet pipeline, a water pump, a heater, and a
water outlet pipeline. The circulation system can, therefore,
maintain the temperature of water in the pool within a comfortable
temperature range for the human body, and thus enables users to use
the pool for a long time.
[0004] Conventional water pumps for pool circulation systems use a
separate-type impeller. That is, the impeller and the motor rotor
of the water pump are two independent components. Such
separate-type impellers may become loose and disassembled after
long-term use, which can result in increased noise during operation
of the water pump. In addition, looseness between the impeller and
the motor rotor may cause damage to components of the water pump
and reduce the service life of the water pump.
SUMMARY
[0005] In accordance with various embodiments of the present
disclosure, a motor rotor for a water pump comprises a hollow
rotatable shaft having a first injection-molded part. The motor
rotor also includes a magnet having an axial length and being
disposed circumferentially around a portion of the first
injection-molded part. The portion of the first injection-molded
part extends through the entire axial length of the magnet. The
motor rotor also includes an impeller integrally formed with the
first injection-molded part, the impeller being located at an axial
end of the hollow rotatable shaft.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] To understand the present disclosure, it will now be
described by way of example, with reference to the accompanying
drawings in which implementations of the disclosure are illustrated
and, together with the description below, serve to explain the
principles of the disclosure.
[0007] FIG. 1 is a cross-sectional view of a pool circulation
system, according to embodiments of the present disclosure;
[0008] FIG. 2 is an exploded view of a water pump, according to
embodiments of the present disclosure;
[0009] FIG. 3 is a cross-sectional view of the water pump of FIG.
2;
[0010] FIG. 4 is a perspective view of a motor rotor of the water
pump of FIG. 2, according to embodiments of the present
disclosure;
[0011] FIG. 5 is a cross-sectional perspective view of the motor
rotor of FIG. 4;
[0012] FIG. 6 is a cross-sectional view of the motor rotor of FIG.
4;
[0013] FIG. 7 is a perspective view of a motor rotor of the water
pump of FIG. 2, according to embodiments of the present
disclosure;
[0014] FIG. 8 is a cross-sectional perspective view of the motor
rotor of FIG. 7;
[0015] FIG. 9 is a cross-sectional view of the motor rotor of FIG.
7;
[0016] FIG. 10 is a perspective view of a motor rotor of the water
pump of FIG. 2, according to embodiments of the present
disclosure;
[0017] FIG. 11 is a cross-sectional perspective view of the motor
rotor of FIG. 10;
[0018] FIG. 12 is a cross-sectional view of the motor rotor of FIG.
10;
[0019] FIG. 13 is a perspective view of a motor rotor of the water
pump of FIG. 2, according to embodiments of the present
disclosure;
[0020] FIG. 14 is a cross-sectional perspective view of the motor
rotor of FIG. 13; and
[0021] FIG. 15 is a cross-sectional view of the motor rotor of FIG.
13.
DETAILED DESCRIPTION
[0022] The present disclosure provides exemplary embodiments of a
pool circulation system, and a water pump for use within such a
pool circulation system. Furthermore, the present disclosure
provides exemplary embodiments of a motor rotor for a water pump.
The exemplary embodiments of the present disclosure are described
below with reference to the drawings for illustration. It should be
understood that the description about the exemplary embodiments
should be considered as mere illustrations of the structures and
principles of the present invention, and the present invention is
not limited to the exemplary embodiments. The present invention may
be incorporated in any type or form of a water pump, including, but
not limited to pumping devices for pools or hot tubs, or any other
desired pumping device. The water pump, and the motor rotor of the
present disclosure, includes improvements over conventional water
pumps having conventional motor rotors.
[0023] FIG. 1 is a cross-sectional diagram of a pool circulation
system, according to some embodiments of the present disclosure.
The pool circulation system may be used to control the temperature
of the pool by circulating water through a heater. As shown in FIG.
1, the pool circulation system comprises a water pump 1, a heater
2, a water inlet pipeline 3 and a water outlet pipeline 4. In some
embodiments, the pool circulation system may comprise other
components, such as a filter for removing impurities from the
water. A filter may be arranged, for example, in the water pump 1
or between the water pump 1 and the heater 2.
[0024] The water inlet pipeline 3 comprises a water inlet end 31
and a water outlet end 32. The water inlet end 31 is in
communication with a water injection region of the pool and is
provided with a one-way valve so that water can only flow from the
water injection region of the pool to the water inlet pipeline 3.
The water outlet end 32 is in communication with a water inlet 111
of the water pump 1. When a motor of the water pump 1 is started,
the water pump 1 pumps water to be heated from the water injection
region of the pool via the water inlet pipeline 3 and conveys the
pumped water to the heater 2. A water inlet 21 of the heater 2 is
in communication with a water outlet 112 of the water pump 1. The
water entering the heater 2 from the water inlet 21 is heated by a
heating component 23 of the heater 2 and is then conveyed to the
water injection region of the pool via the water outlet pipeline 4.
The water outlet pipeline 4 comprises a water inlet end 41 and a
water outlet end 42. The water inlet end 41 is in communication
with the water outlet 22 of the heater 2, and the water outlet end
42 is in communication with the water injection region of the pool
and is provided with a one-way valve, so that water can only flow
from the water outlet pipeline 4 to the water injection region of
the pool.
[0025] In some embodiments, the pool circulation system may further
comprise a water flow switch provided on the water inlet pipeline 3
and/or on the water outlet pipeline 4. For example, FIG. 1 shows a
water flow switch 43 provided on the water outlet pipeline 4. The
water flow switch 43 may trigger an alarm signal when no water is
in the pool circulation system to avoid or reduce damaging the
heater 2, without water or no-load operation of the filter.
[0026] In some embodiments, and as shown on FIG. 1, the pool
circulation system further comprises a temperature sensing probe 24
provided downstream of the heating component 23 of the heater 2 to
sense the temperature of the heated water. In some embodiments, and
as also shown on FIG. 1, the pool circulation system further
comprises a temperature controller 25 provided in the heater 2. The
temperature controller 25 is, for example, a manually reset
temperature controller, or the temperature controller 25 can be
advantageously electrically connected to the temperature sensing
probe 24 to control the heating temperature of the heater 2 based
on the sensing result of the temperature sensing probe 24.
[0027] The specific structure of the water pump 1 of the pool
circulation system, according to some embodiments, will be
described with reference to FIGS. 2 and 3. FIG. 2 is an exploded
view of the water pump 1 of the pool circulation system of FIG. 1.
FIG. 3 is a cross-sectional view of the water pump 1 of FIG. 2. As
shown in FIGS. 2 and 3, the water pump 1 comprises a pump cover 11,
a housing 12, as well as a motor rotor 13 and a motor stator
mounted in the housing 12.
[0028] As shown in FIG. 3, the housing 12 comprises a first chamber
121 provided with an opening 126 in a mounting end face 124 of the
housing 12, and a second chamber 122 isolated from the first
chamber 121 in a sealed manner by a pump wall 123. A fixing rod 14
is mounted in the first chamber 121. A first end 141 of the fixing
rod 14 is fixed to the bottom of the first chamber 121, and a
second end 142 protrudes from the opening 126 and is fixed to the
pump cover 11. The fixing rod 14 may be, for example, a porcelain
shaft.
[0029] The pump cover 11 comprises a body 113 and a mounting flange
114 extending around an edge of the body 113. The mounting flange
114 is adapted in shape to an outer edge of the mounting end face
124 of the housing 12, so that the mounting flange 114 can be
connected to the mounting end face 124 by connecting components
(e.g., screws), so that the pump cover 11 and the housing 12 are
fixed to each other and confine a drainage chamber 115 through
which the fixing rod 14 passes. The body 113 of the pump cover 11
is provided with a water inlet 111 in communication with the water
inlet pipeline 3 and a water outlet 112 in communication with the
heater 2.
[0030] The motor rotor 13 comprises a hollow rotatable shaft 131
and an impeller 132 integrally formed with the hollow rotatable
shaft 131. The hollow rotatable shaft 131 is mounted in the first
cavity 121 of the housing 12 by being sheathed on the fixing rod
14, and axially extends from the first chamber 121 to the drainage
chamber 115 via the opening 126. The impeller 132 is integrally
formed at one axial end, located in the drainage chamber 115, of
the hollow rotatable shaft 131 so as to drive water to flow in the
drainage chamber 115. Compared with the split designs of the hollow
rotatable shaft 131 and the impeller 132 found in conventional
water pumps, the integrated motor rotor 13 of the present
disclosure effectively reduces the operation noise and prolongs the
service life of the water pump.
[0031] The motor stator is provided in the second chamber 122, and
a magnetic field generated by the motor stator passes through the
pump wall 123 between the first chamber 121 and the second chamber
122 to drive the motor rotor 13 by interacting with a magnet (for
example, magnetic steel) within the hollow rotatable shaft 131 of
the motor rotor 13. It is noted that the second chamber 122 should
be isolated, in a sealed manner, from the first chamber 121 and the
drainage chamber 115 to prevent water from entering the second
chamber 122 and damaging the motor stator. In some embodiments, the
motor stator comprises a winding bobbin 151 provided in the second
chamber 122, a silicon steel sheet 152 provided on the winding
bobbin 151, and an insulating sheet 153 provided on the silicon
steel sheet 152.
[0032] When the motor stator is powered on, a magnetic field
generated by the motor stator drives the motor rotor 13 to rotate
around the fixing rod 14. Water from the pool is thus drawn into
the drainage chamber 115 through the water inlet 111 by rotation of
the impeller 132 of the motor rotor 13, and the pumped water is
conveyed to the heater 2 through the water outlet 112.
[0033] In some example embodiments, as shown in FIG. 2, and in
order to improve sealing performance, the mounting end face 124 of
the housing 12 defines an annular groove 125 which faces the
mounting flange 114 of the pump cover 11. The water pump 1 further
comprises a seal ring 18 which is provided in the annular groove
125 and is attached to the mounting flange 114 to prevent water in
the drainage chamber 115 from flowing between the mounting flange
114 and the mounting end face 124. At least one reinforcing rib 116
may be provided between the body 113 of the pump cover 11 and the
mounting flange 114 to increase the strength of the pump cover
11.
[0034] In some example embodiments, as shown in FIG. 3, and in
order to further improve sealing performance, the pump cover 11
defines a recess 117 configured to receive the second end 142 of
the fixing rod 14. The water pump 1 comprises a sealing cap 16
which is disposed in the recess 117 and covers the second end 142
of the fixing rod 14. The water pump 1 may further comprise a
similar or identical sealing cap 16 at the bottom of the first
chamber 121 to cover the first end 141 of the fixing rod 14. The
water pump 1 may further comprise a wear pad 17 which is sheathed
on the fixing rod 14 and is located between the sealing cap 16 and
the motor rotor 13.
[0035] Four different embodiments of the motor rotor 13 of the
water pump 1, according to the present disclosure, are described in
conjunction with FIGS. 4 to 15. In some embodiments, the motor
rotor 13 may be manufactured using secondary injection molding due
to the presence of the magnet 134.
[0036] FIG. 4 is a perspective view of a first embodiment of the
motor rotor 13 of the water pump, according to the present
disclosure. FIG. 5 is a cross-sectional perspective view of the
motor rotor 13 of FIG. 4, and FIG. 6 is a cross-sectional view of
the motor rotor 13 of FIG. 4.
[0037] In the first embodiment, the hollow rotatable shaft 131 of
the motor rotor 13 comprises a first injection molded part 1311 and
a second injection molded part 1312. The first injection molded
part 1311 has a cylindrical structure that extends
circumferentially around and axially along the fixing rod 14 from
the first chamber 121 of the housing 12 to the drainage chamber 115
and is integrally formed with the impeller 132. The second
injection molded part 1312 extends circumferentially around the
first injection molded part 1311 and over a part of an axial length
of the first injection molded part 1311. The second injection
molded part 1312 cooperates with the first injection molded part
1311 so that the magnet 134 is fixedly clamped between the first
injection molded part 1311 and the second injection molded part
1312.
[0038] More specifically, as shown in FIGS. 4 to 6, the first
injection molded part 1311 is configured to extend around the
fixing rod 14, substantially over the entire axial length of the
hollow rotatable shaft 131. The impeller 132 extends radially
outwardly from an axial end of the hollow rotatable shaft 131. The
first injection molded part 1311 further comprises a first
protrusion 13111, a second protrusion 13112, and a third protrusion
13113, which protrude from an outer wall of the first injection
molded part 1311, the first protrusion 13111 being located at the
bottom of the first injection molded part 1311, and the second
protrusion 13112 and the third protrusion 13113 being located at a
substantially axial central position of the first injection molded
part 1311. The magnet 134 is disposed circumferentially around a
portion of the first injection molded part 1311 between the first
protrusion 13111 and the second protrusion 13112, with a portion of
the first injection molded part 1311 extending through an entire
axial length of the magnet 134.
[0039] The second injection molded part 1312 extends axially from
the bottom of the motor rotor 13 to the third protrusion 13113 of
the first injection molded part 1311 to cover the magnet 134. The
second injection molded part 1312 further comprises a first fixing
portion 13121 and a second fixing portion 13122, which protrude
from an inner wall of the second injection molded part 1312, the
first fixing portion 13121 forming the bottom of the motor rotor 13
to support the magnet 134 and the first injection molded part 1311,
and the second fixing portion 13122 being clamped between the
second protrusion 13112 and the third protrusion 13113 of the first
injection molded part 1311, so that the second injection molded
part 1312 cooperates with the first injection molded part 1311, so
that the magnet 134 is fixedly clamped between the first injection
molded part 1311 and the second injection molded part 1312.
[0040] In order to increase wear resistance, the motor rotor 13
further comprises two shaft sleeves (for example, porcelain
sleeves) which are nested between the fixing rod 14 and the hollow
rotatable shaft 131 at two axial ends of the hollow rotatable shaft
131. More specifically, the motor rotor 13 comprises a first shaft
sleeve 1331, which is nested between the fixing rod 14 and the
first protrusion 13111 of the first injection molded part 1311 and
between the fixing rod 14 and the first fixing portion 13121 of the
second injection molded part 1312 at the bottom of the hollow
rotatable shaft 131, and a second shaft sleeve 1332 which is nested
between the fixing rod 14 and the top of the first injection molded
part 1311 at the top of the hollow rotatable shaft 131.
[0041] FIG. 7 is a perspective view of a second embodiment of the
motor rotor 13 of the water pump, according to the present
disclosure. FIG. 8 is a cross-sectional perspective view of the
motor rotor 13 of FIG. 7, and FIG. 9 is a cross-sectional view of
the motor rotor 13 of FIG. 7.
[0042] In the second embodiment, the structures of the hollow
rotatable shaft 131 and the impeller 132 of the motor rotor 13 are
similar to those in the first embodiment, which will not be
described here again. Different from the first embodiment, as shown
in FIGS. 7 to 9, the motor rotor 13 comprises a shaft sleeve 1333
which is nested between the fixing rod 14 and the hollow rotatable
shaft 131 substantially along the entire axial length of the hollow
rotatable shaft 131. That is, the shaft sleeve 1333 axially
extends, around the fixing rod 14, substantially from the first
fixing portion 13121 of the second injection molded part 1312 and
through the impeller 132 located at the top of the first injection
molded part 1311.
[0043] FIG. 10 is a perspective view of a third embodiment of the
motor rotor 13 of the water pump, according to the present
disclosure. FIG. 11 is a cross-sectional perspective view of the
motor rotor 13 of FIG. 10, and FIG. 12 is a cross-sectional view of
the motor rotor 13 of FIG. 10.
[0044] In the third embodiment, the hollow rotatable shaft 131 of
the motor rotor 13 comprises a first injection molded part 1311 and
a second injection molded part 1312. The first injection molded
part 1311 has a cylindrical structure that extends
circumferentially around and axially along the fixing rod 14 in the
first chamber 121 of the housing 12. The second injection molded
part 1312 extends circumferentially around the first injection
molded part 1311 and the fixing rod 14, from the first chamber 121
of the housing 12 to the drainage chamber 115 and is integrally
formed with the impeller 132. The second injection molded part 1312
cooperates with the first injection molded part 1311, so that the
magnet 134 is fixedly clamped between the first injection molded
part 1311 and the second injection molded part 1312.
[0045] More specifically, as shown in FIGS. 10 to 12, the first
injection molded part 1311 is configured to extend around the
fixing rod 14, from a position near the bottom of the motor rotor
13. The first injection molded part 1311 extends axially through an
entire axial length of the magnet 134 and beyond. The first
injection molded part 1311 further comprises a first protrusion
13111, a second protrusion 13112 and a third protrusion 13113,
which protrude from an outer wall of the first injection molded
part 1311. The first protrusion 13111 is located at the bottom of
the first injection molded part 1311. The second protrusion 13112
and the third protrusion 13113 are each located at the
substantially axial central position of the hollow rotatable shaft
131, with the magnet 134 extending circumferentially around the
first injection molded part 1311 and being fixed axially between
the first protrusion 13111 and the second protrusion 13112.
[0046] The second injection molded part 1312 extends around the
first injection molded part 1311, the magnet 134 and the fixing rod
14 over the entire axial length of the hollow rotatable shaft 131
to cover the magnet 134 and the first injection molded part 1311 so
as to form the illustrated "stepped" structure. The impeller 132
radially extends outward from an axial end of the second injection
molded part 1312. The impeller 132 is thus located in the drainage
chamber 115, so as to drive water to flow in the drainage chamber
115. The second injection molded part 1312 further comprises a
first fixing portion 13121 and a second fixing portion 13122, which
protrude from an inner wall of the second injection molded part
1312, the first fixing portion 13121 forming the bottom of the
motor rotor 13 to support the magnet 134 and the first injection
molded part 1311, and the second fixing portion 13122 being clamped
between the second protrusion 13112 and the third protrusion 13113
of the first injection molded part 1311 so that the second
injection molded part 1312 cooperates with the first injection
molded part 1311, so that the magnet 134 is fixedly clamped between
the first injection molded part 1311 and the second injection
molded part 1312.
[0047] In order to increase the wear resistance, the motor rotor 13
further comprises two shaft sleeves (for example, porcelain
sleeves) which are nested between the fixing rod 14 and the hollow
rotatable shaft 131 at two axial ends of the hollow rotatable shaft
131. More specifically, the motor rotor 13 comprises a first shaft
sleeve 1331 which is nested between the fixing rod 14 and the first
protrusion 13111 of the first injection molded part 1311 and
between the fixing rod 14 and the first fixing portion 13121 of the
second injection molded part 1312 at the bottom of the hollow
rotatable shaft 131, and a second shaft sleeve 1332 which is nested
between the fixing rod 14 and the top of the second injection
molded part 1312 at the top of the hollow rotatable shaft 131.
[0048] FIG. 13 is a perspective view of a fourth embodiment of the
motor rotor 13 of the water pump, according to the present
disclosure. FIG. 14 is a cross-sectional perspective view of the
motor rotor 13 of FIG. 13, and FIG. 15 is a cross-sectional view of
the motor rotor 13 of FIG. 13.
[0049] In the fourth embodiment, the structures of the hollow
rotatable shaft 131 and the impeller 132 of the motor rotor 13 are
similar to those in the third embodiment, which will not be
described here again. Different from the third embodiment, as shown
in FIGS. 13 to 15, the motor rotor 13 comprises a shaft sleeve 1333
which is nested between the fixing rod 14 and the hollow rotatable
shaft 131 substantially along the entire axial length of the hollow
rotatable shaft 131. That is, the shaft sleeve 1333 extends around
the fixing rod 14, substantially from the first fixing portion
13121 of the second injection molded part 1312 and through the
impeller 132 located at the top of the second injection molded part
1312.
[0050] Although some embodiments have been described by way of
examples herein, various variations could be made to these
embodiments without departing from the spirit of the present
disclosure. All such variations belong to the conception of the
present disclosure and fall within the scope of protection defined
by the claims of the present disclosure. The specific embodiments
disclosed herein are merely illustrative of the present disclosure.
It would be apparent to those skilled in the art that various
modifications could be made according to the teachings of the
present disclosure and the present disclosure could be practiced in
various equivalent ways. Thus, the particular embodiments of the
present disclosure disclosed above are illustrative only, and the
scope of protection of the present disclosure is not limited by the
details of the structures or designs disclosed herein. Accordingly,
various substitutions, combinations, or modifications could be made
to the particular exemplary embodiments disclosed herein, and all
variations thereof fall within the scope of the present disclosure.
The pool circulation system, water pump, and motor rotors
exemplarily disclosed herein may also be suitably practiced in the
absence of any element not specifically disclosed herein or in the
absence of any optional components disclosed herein.
* * * * *